Mercurial > hg > graal-jvmci-8
annotate src/os/linux/vm/os_linux.cpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
| author | sla |
|---|---|
| date | Mon, 10 Jun 2013 11:30:51 +0200 |
| parents | e72f7eecc96d |
| children | 836a62f43af9 a837fa3d3f86 b5c8a61d7fa0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 // no precompiled headers |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
| 29 #include "code/icBuffer.hpp" | |
| 30 #include "code/vtableStubs.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
| 1972 | 33 #include "interpreter/interpreter.hpp" |
| 34 #include "jvm_linux.h" | |
| 35 #include "memory/allocation.inline.hpp" | |
| 36 #include "memory/filemap.hpp" | |
| 37 #include "mutex_linux.inline.hpp" | |
| 38 #include "oops/oop.inline.hpp" | |
| 39 #include "os_share_linux.hpp" | |
| 40 #include "prims/jniFastGetField.hpp" | |
| 41 #include "prims/jvm.h" | |
| 42 #include "prims/jvm_misc.hpp" | |
| 43 #include "runtime/arguments.hpp" | |
| 44 #include "runtime/extendedPC.hpp" | |
| 45 #include "runtime/globals.hpp" | |
| 46 #include "runtime/interfaceSupport.hpp" | |
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47 #include "runtime/init.hpp" |
| 1972 | 48 #include "runtime/java.hpp" |
| 49 #include "runtime/javaCalls.hpp" | |
| 50 #include "runtime/mutexLocker.hpp" | |
| 51 #include "runtime/objectMonitor.hpp" | |
| 52 #include "runtime/osThread.hpp" | |
| 53 #include "runtime/perfMemory.hpp" | |
| 54 #include "runtime/sharedRuntime.hpp" | |
| 55 #include "runtime/statSampler.hpp" | |
| 56 #include "runtime/stubRoutines.hpp" | |
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57 #include "runtime/thread.inline.hpp" |
| 1972 | 58 #include "runtime/threadCritical.hpp" |
| 59 #include "runtime/timer.hpp" | |
| 60 #include "services/attachListener.hpp" | |
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61 #include "services/memTracker.hpp" |
| 1972 | 62 #include "services/runtimeService.hpp" |
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63 #include "utilities/decoder.hpp" |
| 1972 | 64 #include "utilities/defaultStream.hpp" |
| 65 #include "utilities/events.hpp" | |
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66 #include "utilities/elfFile.hpp" |
| 1972 | 67 #include "utilities/growableArray.hpp" |
| 68 #include "utilities/vmError.hpp" | |
| 0 | 69 |
| 70 // put OS-includes here | |
| 71 # include <sys/types.h> | |
| 72 # include <sys/mman.h> | |
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73 # include <sys/stat.h> |
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74 # include <sys/select.h> |
| 0 | 75 # include <pthread.h> |
| 76 # include <signal.h> | |
| 77 # include <errno.h> | |
| 78 # include <dlfcn.h> | |
| 79 # include <stdio.h> | |
| 80 # include <unistd.h> | |
| 81 # include <sys/resource.h> | |
| 82 # include <pthread.h> | |
| 83 # include <sys/stat.h> | |
| 84 # include <sys/time.h> | |
| 85 # include <sys/times.h> | |
| 86 # include <sys/utsname.h> | |
| 87 # include <sys/socket.h> | |
| 88 # include <sys/wait.h> | |
| 89 # include <pwd.h> | |
| 90 # include <poll.h> | |
| 91 # include <semaphore.h> | |
| 92 # include <fcntl.h> | |
| 93 # include <string.h> | |
| 94 # include <syscall.h> | |
| 95 # include <sys/sysinfo.h> | |
| 96 # include <gnu/libc-version.h> | |
| 97 # include <sys/ipc.h> | |
| 98 # include <sys/shm.h> | |
| 99 # include <link.h> | |
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100 # include <stdint.h> |
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101 # include <inttypes.h> |
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102 # include <sys/ioctl.h> |
| 0 | 103 |
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104 // if RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling |
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105 // getrusage() is prepared to handle the associated failure. |
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106 #ifndef RUSAGE_THREAD |
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107 #define RUSAGE_THREAD (1) /* only the calling thread */ |
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108 #endif |
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109 |
| 0 | 110 #define MAX_PATH (2 * K) |
| 111 | |
| 112 // for timer info max values which include all bits | |
| 113 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
| 114 | |
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115 #define LARGEPAGES_BIT (1 << 6) |
| 0 | 116 //////////////////////////////////////////////////////////////////////////////// |
| 117 // global variables | |
| 118 julong os::Linux::_physical_memory = 0; | |
| 119 | |
| 120 address os::Linux::_initial_thread_stack_bottom = NULL; | |
| 121 uintptr_t os::Linux::_initial_thread_stack_size = 0; | |
| 122 | |
| 123 int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
| 124 int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
| 125 Mutex* os::Linux::_createThread_lock = NULL; | |
| 126 pthread_t os::Linux::_main_thread; | |
| 127 int os::Linux::_page_size = -1; | |
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128 const int os::Linux::_vm_default_page_size = (8 * K); |
| 0 | 129 bool os::Linux::_is_floating_stack = false; |
| 130 bool os::Linux::_is_NPTL = false; | |
| 131 bool os::Linux::_supports_fast_thread_cpu_time = false; | |
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132 const char * os::Linux::_glibc_version = NULL; |
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133 const char * os::Linux::_libpthread_version = NULL; |
| 0 | 134 |
| 135 static jlong initial_time_count=0; | |
| 136 | |
| 137 static int clock_tics_per_sec = 100; | |
| 138 | |
| 139 // For diagnostics to print a message once. see run_periodic_checks | |
| 140 static sigset_t check_signal_done; | |
| 141 static bool check_signals = true;; | |
| 142 | |
| 143 static pid_t _initial_pid = 0; | |
| 144 | |
| 145 /* Signal number used to suspend/resume a thread */ | |
| 146 | |
| 147 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
| 148 static int SR_signum = SIGUSR2; | |
| 149 sigset_t SR_sigset; | |
| 150 | |
| 242 | 151 /* Used to protect dlsym() calls */ |
| 152 static pthread_mutex_t dl_mutex; | |
| 153 | |
| 10405 | 154 // Declarations |
| 155 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); | |
| 156 | |
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157 #ifdef JAVASE_EMBEDDED |
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158 class MemNotifyThread: public Thread { |
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159 friend class VMStructs; |
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160 public: |
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161 virtual void run(); |
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162 |
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163 private: |
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164 static MemNotifyThread* _memnotify_thread; |
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165 int _fd; |
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166 |
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167 public: |
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168 |
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169 // Constructor |
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170 MemNotifyThread(int fd); |
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171 |
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172 // Tester |
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173 bool is_memnotify_thread() const { return true; } |
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174 |
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175 // Printing |
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176 char* name() const { return (char*)"Linux MemNotify Thread"; } |
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177 |
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178 // Returns the single instance of the MemNotifyThread |
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179 static MemNotifyThread* memnotify_thread() { return _memnotify_thread; } |
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180 |
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181 // Create and start the single instance of MemNotifyThread |
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182 static void start(); |
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183 }; |
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184 #endif // JAVASE_EMBEDDED |
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185 |
| 0 | 186 // utility functions |
| 187 | |
| 188 static int SR_initialize(); | |
| 189 | |
| 190 julong os::available_memory() { | |
| 191 return Linux::available_memory(); | |
| 192 } | |
| 193 | |
| 194 julong os::Linux::available_memory() { | |
| 195 // values in struct sysinfo are "unsigned long" | |
| 196 struct sysinfo si; | |
| 197 sysinfo(&si); | |
| 198 | |
| 199 return (julong)si.freeram * si.mem_unit; | |
| 200 } | |
| 201 | |
| 202 julong os::physical_memory() { | |
| 203 return Linux::physical_memory(); | |
| 204 } | |
| 205 | |
| 206 //////////////////////////////////////////////////////////////////////////////// | |
| 207 // environment support | |
| 208 | |
| 209 bool os::getenv(const char* name, char* buf, int len) { | |
| 210 const char* val = ::getenv(name); | |
| 211 if (val != NULL && strlen(val) < (size_t)len) { | |
| 212 strcpy(buf, val); | |
| 213 return true; | |
| 214 } | |
| 215 if (len > 0) buf[0] = 0; // return a null string | |
| 216 return false; | |
| 217 } | |
| 218 | |
| 219 | |
| 220 // Return true if user is running as root. | |
| 221 | |
| 222 bool os::have_special_privileges() { | |
| 223 static bool init = false; | |
| 224 static bool privileges = false; | |
| 225 if (!init) { | |
| 226 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
| 227 init = true; | |
| 228 } | |
| 229 return privileges; | |
| 230 } | |
| 231 | |
| 232 | |
| 233 #ifndef SYS_gettid | |
| 234 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
| 235 #ifdef __ia64__ | |
| 236 #define SYS_gettid 1105 | |
| 237 #elif __i386__ | |
| 238 #define SYS_gettid 224 | |
| 239 #elif __amd64__ | |
| 240 #define SYS_gettid 186 | |
| 241 #elif __sparc__ | |
| 242 #define SYS_gettid 143 | |
| 243 #else | |
| 244 #error define gettid for the arch | |
| 245 #endif | |
| 246 #endif | |
| 247 | |
| 248 // Cpu architecture string | |
| 1010 | 249 #if defined(ZERO) |
| 250 static char cpu_arch[] = ZERO_LIBARCH; | |
| 251 #elif defined(IA64) | |
| 0 | 252 static char cpu_arch[] = "ia64"; |
| 253 #elif defined(IA32) | |
| 254 static char cpu_arch[] = "i386"; | |
| 255 #elif defined(AMD64) | |
| 256 static char cpu_arch[] = "amd64"; | |
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257 #elif defined(ARM) |
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258 static char cpu_arch[] = "arm"; |
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259 #elif defined(PPC) |
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260 static char cpu_arch[] = "ppc"; |
| 0 | 261 #elif defined(SPARC) |
| 262 # ifdef _LP64 | |
| 263 static char cpu_arch[] = "sparcv9"; | |
| 264 # else | |
| 265 static char cpu_arch[] = "sparc"; | |
| 266 # endif | |
| 267 #else | |
| 268 #error Add appropriate cpu_arch setting | |
| 269 #endif | |
| 270 | |
| 271 | |
| 272 // pid_t gettid() | |
| 273 // | |
| 274 // Returns the kernel thread id of the currently running thread. Kernel | |
| 275 // thread id is used to access /proc. | |
| 276 // | |
| 277 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
| 278 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
| 279 // | |
| 280 pid_t os::Linux::gettid() { | |
| 281 int rslt = syscall(SYS_gettid); | |
| 282 if (rslt == -1) { | |
| 283 // old kernel, no NPTL support | |
| 284 return getpid(); | |
| 285 } else { | |
| 286 return (pid_t)rslt; | |
| 287 } | |
| 288 } | |
| 289 | |
| 290 // Most versions of linux have a bug where the number of processors are | |
| 291 // determined by looking at the /proc file system. In a chroot environment, | |
| 292 // the system call returns 1. This causes the VM to act as if it is | |
| 293 // a single processor and elide locking (see is_MP() call). | |
| 294 static bool unsafe_chroot_detected = false; | |
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295 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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296 "Java may be unstable running multithreaded in a chroot " |
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297 "environment on Linux when /proc filesystem is not mounted."; |
| 0 | 298 |
| 299 void os::Linux::initialize_system_info() { | |
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300 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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301 if (processor_count() == 1) { |
| 0 | 302 pid_t pid = os::Linux::gettid(); |
| 303 char fname[32]; | |
| 304 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
| 305 FILE *fp = fopen(fname, "r"); | |
| 306 if (fp == NULL) { | |
| 307 unsafe_chroot_detected = true; | |
| 308 } else { | |
| 309 fclose(fp); | |
| 310 } | |
| 311 } | |
| 312 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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313 assert(processor_count() > 0, "linux error"); |
| 0 | 314 } |
| 315 | |
| 316 void os::init_system_properties_values() { | |
| 317 // char arch[12]; | |
| 318 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
| 319 | |
| 320 // The next steps are taken in the product version: | |
| 321 // | |
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322 // Obtain the JAVA_HOME value from the location of libjvm.so. |
| 0 | 323 // This library should be located at: |
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324 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
| 0 | 325 // |
| 326 // If "/jre/lib/" appears at the right place in the path, then we | |
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327 // assume libjvm.so is installed in a JDK and we use this path. |
| 0 | 328 // |
| 329 // Otherwise exit with message: "Could not create the Java virtual machine." | |
| 330 // | |
| 331 // The following extra steps are taken in the debugging version: | |
| 332 // | |
| 333 // If "/jre/lib/" does NOT appear at the right place in the path | |
| 334 // instead of exit check for $JAVA_HOME environment variable. | |
| 335 // | |
| 336 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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337 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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338 // it looks like libjvm.so is installed there |
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339 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
| 0 | 340 // |
| 341 // Otherwise exit. | |
| 342 // | |
| 343 // Important note: if the location of libjvm.so changes this | |
| 344 // code needs to be changed accordingly. | |
| 345 | |
| 346 // The next few definitions allow the code to be verbatim: | |
| 6197 | 347 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
| 0 | 348 #define getenv(n) ::getenv(n) |
| 349 | |
| 350 /* | |
| 351 * See ld(1): | |
| 352 * The linker uses the following search paths to locate required | |
| 353 * shared libraries: | |
| 354 * 1: ... | |
| 355 * ... | |
| 356 * 7: The default directories, normally /lib and /usr/lib. | |
| 357 */ | |
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358 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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359 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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360 #else |
| 0 | 361 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
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362 #endif |
| 0 | 363 |
| 364 #define EXTENSIONS_DIR "/lib/ext" | |
| 365 #define ENDORSED_DIR "/lib/endorsed" | |
| 366 #define REG_DIR "/usr/java/packages" | |
| 367 | |
| 368 { | |
| 369 /* sysclasspath, java_home, dll_dir */ | |
| 370 { | |
| 371 char *home_path; | |
| 372 char *dll_path; | |
| 373 char *pslash; | |
| 374 char buf[MAXPATHLEN]; | |
| 375 os::jvm_path(buf, sizeof(buf)); | |
| 376 | |
| 377 // Found the full path to libjvm.so. | |
| 378 // Now cut the path to <java_home>/jre if we can. | |
| 379 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
| 380 pslash = strrchr(buf, '/'); | |
| 381 if (pslash != NULL) | |
| 382 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
| 383 dll_path = malloc(strlen(buf) + 1); | |
| 384 if (dll_path == NULL) | |
| 385 return; | |
| 386 strcpy(dll_path, buf); | |
| 387 Arguments::set_dll_dir(dll_path); | |
| 388 | |
| 389 if (pslash != NULL) { | |
| 390 pslash = strrchr(buf, '/'); | |
| 391 if (pslash != NULL) { | |
| 392 *pslash = '\0'; /* get rid of /<arch> */ | |
| 393 pslash = strrchr(buf, '/'); | |
| 394 if (pslash != NULL) | |
| 395 *pslash = '\0'; /* get rid of /lib */ | |
| 396 } | |
| 397 } | |
| 398 | |
| 399 home_path = malloc(strlen(buf) + 1); | |
| 400 if (home_path == NULL) | |
| 401 return; | |
| 402 strcpy(home_path, buf); | |
| 403 Arguments::set_java_home(home_path); | |
| 404 | |
| 405 if (!set_boot_path('/', ':')) | |
| 406 return; | |
| 407 } | |
| 408 | |
| 409 /* | |
| 410 * Where to look for native libraries | |
| 411 * | |
| 412 * Note: Due to a legacy implementation, most of the library path | |
| 413 * is set in the launcher. This was to accomodate linking restrictions | |
| 414 * on legacy Linux implementations (which are no longer supported). | |
| 415 * Eventually, all the library path setting will be done here. | |
| 416 * | |
| 417 * However, to prevent the proliferation of improperly built native | |
| 418 * libraries, the new path component /usr/java/packages is added here. | |
| 419 * Eventually, all the library path setting will be done here. | |
| 420 */ | |
| 421 { | |
| 422 char *ld_library_path; | |
| 423 | |
| 424 /* | |
| 425 * Construct the invariant part of ld_library_path. Note that the | |
| 426 * space for the colon and the trailing null are provided by the | |
| 427 * nulls included by the sizeof operator (so actually we allocate | |
| 428 * a byte more than necessary). | |
| 429 */ | |
| 430 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + | |
| 431 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
| 432 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
| 433 | |
| 434 /* | |
| 435 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
| 436 * should always exist (until the legacy problem cited above is | |
| 437 * addressed). | |
| 438 */ | |
| 439 char *v = getenv("LD_LIBRARY_PATH"); | |
| 440 if (v != NULL) { | |
| 441 char *t = ld_library_path; | |
| 442 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 443 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
| 444 sprintf(ld_library_path, "%s:%s", v, t); | |
| 445 } | |
| 446 Arguments::set_library_path(ld_library_path); | |
| 447 } | |
| 448 | |
| 449 /* | |
| 450 * Extensions directories. | |
| 451 * | |
| 452 * Note that the space for the colon and the trailing null are provided | |
| 453 * by the nulls included by the sizeof operator (so actually one byte more | |
| 454 * than necessary is allocated). | |
| 455 */ | |
| 456 { | |
| 457 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
| 458 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
| 459 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
| 460 Arguments::get_java_home()); | |
| 461 Arguments::set_ext_dirs(buf); | |
| 462 } | |
| 463 | |
| 464 /* Endorsed standards default directory. */ | |
| 465 { | |
| 466 char * buf; | |
| 467 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
| 468 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
| 469 Arguments::set_endorsed_dirs(buf); | |
| 470 } | |
| 471 } | |
| 472 | |
| 473 #undef malloc | |
| 474 #undef getenv | |
| 475 #undef EXTENSIONS_DIR | |
| 476 #undef ENDORSED_DIR | |
| 477 | |
| 478 // Done | |
| 479 return; | |
| 480 } | |
| 481 | |
| 482 //////////////////////////////////////////////////////////////////////////////// | |
| 483 // breakpoint support | |
| 484 | |
| 485 void os::breakpoint() { | |
| 486 BREAKPOINT; | |
| 487 } | |
| 488 | |
| 489 extern "C" void breakpoint() { | |
| 490 // use debugger to set breakpoint here | |
| 491 } | |
| 492 | |
| 493 //////////////////////////////////////////////////////////////////////////////// | |
| 494 // signal support | |
| 495 | |
| 496 debug_only(static bool signal_sets_initialized = false); | |
| 497 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
| 498 | |
| 499 bool os::Linux::is_sig_ignored(int sig) { | |
| 500 struct sigaction oact; | |
| 501 sigaction(sig, (struct sigaction*)NULL, &oact); | |
| 502 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
| 503 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
| 504 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
| 505 return true; | |
| 506 else | |
| 507 return false; | |
| 508 } | |
| 509 | |
| 510 void os::Linux::signal_sets_init() { | |
| 511 // Should also have an assertion stating we are still single-threaded. | |
| 512 assert(!signal_sets_initialized, "Already initialized"); | |
| 513 // Fill in signals that are necessarily unblocked for all threads in | |
| 514 // the VM. Currently, we unblock the following signals: | |
| 515 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
| 516 // by -Xrs (=ReduceSignalUsage)); | |
| 517 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
| 518 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
| 519 // the dispositions or masks wrt these signals. | |
| 520 // Programs embedding the VM that want to use the above signals for their | |
| 521 // own purposes must, at this time, use the "-Xrs" option to prevent | |
| 522 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
| 523 // (See bug 4345157, and other related bugs). | |
| 524 // In reality, though, unblocking these signals is really a nop, since | |
| 525 // these signals are not blocked by default. | |
| 526 sigemptyset(&unblocked_sigs); | |
| 527 sigemptyset(&allowdebug_blocked_sigs); | |
| 528 sigaddset(&unblocked_sigs, SIGILL); | |
| 529 sigaddset(&unblocked_sigs, SIGSEGV); | |
| 530 sigaddset(&unblocked_sigs, SIGBUS); | |
| 531 sigaddset(&unblocked_sigs, SIGFPE); | |
| 532 sigaddset(&unblocked_sigs, SR_signum); | |
| 533 | |
| 534 if (!ReduceSignalUsage) { | |
| 535 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
| 536 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
| 537 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
| 538 } | |
| 539 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
| 540 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
| 541 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
| 542 } | |
| 543 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
| 544 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
| 545 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
| 546 } | |
| 547 } | |
| 548 // Fill in signals that are blocked by all but the VM thread. | |
| 549 sigemptyset(&vm_sigs); | |
| 550 if (!ReduceSignalUsage) | |
| 551 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
| 552 debug_only(signal_sets_initialized = true); | |
| 553 | |
| 554 } | |
| 555 | |
| 556 // These are signals that are unblocked while a thread is running Java. | |
| 557 // (For some reason, they get blocked by default.) | |
| 558 sigset_t* os::Linux::unblocked_signals() { | |
| 559 assert(signal_sets_initialized, "Not initialized"); | |
| 560 return &unblocked_sigs; | |
| 561 } | |
| 562 | |
| 563 // These are the signals that are blocked while a (non-VM) thread is | |
| 564 // running Java. Only the VM thread handles these signals. | |
| 565 sigset_t* os::Linux::vm_signals() { | |
| 566 assert(signal_sets_initialized, "Not initialized"); | |
| 567 return &vm_sigs; | |
| 568 } | |
| 569 | |
| 570 // These are signals that are blocked during cond_wait to allow debugger in | |
| 571 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
| 572 assert(signal_sets_initialized, "Not initialized"); | |
| 573 return &allowdebug_blocked_sigs; | |
| 574 } | |
| 575 | |
| 576 void os::Linux::hotspot_sigmask(Thread* thread) { | |
| 577 | |
| 578 //Save caller's signal mask before setting VM signal mask | |
| 579 sigset_t caller_sigmask; | |
| 580 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
| 581 | |
| 582 OSThread* osthread = thread->osthread(); | |
| 583 osthread->set_caller_sigmask(caller_sigmask); | |
| 584 | |
| 585 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
| 586 | |
| 587 if (!ReduceSignalUsage) { | |
| 588 if (thread->is_VM_thread()) { | |
| 589 // Only the VM thread handles BREAK_SIGNAL ... | |
| 590 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
| 591 } else { | |
| 592 // ... all other threads block BREAK_SIGNAL | |
| 593 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
| 594 } | |
| 595 } | |
| 596 } | |
| 597 | |
| 598 ////////////////////////////////////////////////////////////////////////////// | |
| 599 // detecting pthread library | |
| 600 | |
| 601 void os::Linux::libpthread_init() { | |
| 602 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
| 603 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
| 604 // generic name for earlier versions. | |
| 605 // Define macros here so we can build HotSpot on old systems. | |
| 606 # ifndef _CS_GNU_LIBC_VERSION | |
| 607 # define _CS_GNU_LIBC_VERSION 2 | |
| 608 # endif | |
| 609 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
| 610 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
| 611 # endif | |
| 612 | |
| 613 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
| 614 if (n > 0) { | |
| 6197 | 615 char *str = (char *)malloc(n, mtInternal); |
| 0 | 616 confstr(_CS_GNU_LIBC_VERSION, str, n); |
| 617 os::Linux::set_glibc_version(str); | |
| 618 } else { | |
| 619 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
| 620 static char _gnu_libc_version[32]; | |
| 621 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
| 622 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
| 623 os::Linux::set_glibc_version(_gnu_libc_version); | |
| 624 } | |
| 625 | |
| 626 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
| 627 if (n > 0) { | |
| 6197 | 628 char *str = (char *)malloc(n, mtInternal); |
| 0 | 629 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
| 630 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
| 631 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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632 // is the case. LinuxThreads has a hard limit on max number of threads. |
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633 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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634 // On the other hand, NPTL does not have such a limit, sysconf() |
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635 // will return -1 and errno is not changed. Check if it is really NPTL. |
| 0 | 636 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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637 strstr(str, "NPTL") && |
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638 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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639 free(str); |
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640 os::Linux::set_libpthread_version("linuxthreads"); |
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641 } else { |
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642 os::Linux::set_libpthread_version(str); |
| 0 | 643 } |
| 644 } else { | |
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645 // glibc before 2.3.2 only has LinuxThreads. |
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646 os::Linux::set_libpthread_version("linuxthreads"); |
| 0 | 647 } |
| 648 | |
| 649 if (strstr(libpthread_version(), "NPTL")) { | |
| 650 os::Linux::set_is_NPTL(); | |
| 651 } else { | |
| 652 os::Linux::set_is_LinuxThreads(); | |
| 653 } | |
| 654 | |
| 655 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
| 656 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
| 657 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
| 658 os::Linux::set_is_floating_stack(); | |
| 659 } | |
| 660 } | |
| 661 | |
| 662 ///////////////////////////////////////////////////////////////////////////// | |
| 663 // thread stack | |
| 664 | |
| 665 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
| 666 // to the stack guard, caller should block all signals. | |
| 667 // | |
| 668 // MAP_GROWSDOWN: | |
| 669 // A special mmap() flag that is used to implement thread stacks. It tells | |
| 670 // kernel that the memory region should extend downwards when needed. This | |
| 671 // allows early versions of LinuxThreads to only mmap the first few pages | |
| 672 // when creating a new thread. Linux kernel will automatically expand thread | |
| 673 // stack as needed (on page faults). | |
| 674 // | |
| 675 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
| 676 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
| 677 // region, it's hard to tell if the fault is due to a legitimate stack | |
| 678 // access or because of reading/writing non-exist memory (e.g. buffer | |
| 679 // overrun). As a rule, if the fault happens below current stack pointer, | |
| 680 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
| 681 // application (see Linux kernel fault.c). | |
| 682 // | |
| 683 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
| 684 // stack overflow detection. | |
| 685 // | |
| 686 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
| 687 // not use this flag. However, the stack of initial thread is not created | |
| 688 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
| 689 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
| 690 // and then attach the thread to JVM. | |
| 691 // | |
| 692 // To get around the problem and allow stack banging on Linux, we need to | |
| 693 // manually expand thread stack after receiving the SIGSEGV. | |
| 694 // | |
| 695 // There are two ways to expand thread stack to address "bottom", we used | |
| 696 // both of them in JVM before 1.5: | |
| 697 // 1. adjust stack pointer first so that it is below "bottom", and then | |
| 698 // touch "bottom" | |
| 699 // 2. mmap() the page in question | |
| 700 // | |
| 701 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
| 702 // if current sp is already near the lower end of page 101, and we need to | |
| 703 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
| 704 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
| 705 // That will destroy the mmap() frame and cause VM to crash. | |
| 706 // | |
| 707 // The following code works by adjusting sp first, then accessing the "bottom" | |
| 708 // page to force a page fault. Linux kernel will then automatically expand the | |
| 709 // stack mapping. | |
| 710 // | |
| 711 // _expand_stack_to() assumes its frame size is less than page size, which | |
| 712 // should always be true if the function is not inlined. | |
| 713 | |
| 714 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
| 715 #define NOINLINE | |
| 716 #else | |
| 717 #define NOINLINE __attribute__ ((noinline)) | |
| 718 #endif | |
| 719 | |
| 720 static void _expand_stack_to(address bottom) NOINLINE; | |
| 721 | |
| 722 static void _expand_stack_to(address bottom) { | |
| 723 address sp; | |
| 724 size_t size; | |
| 725 volatile char *p; | |
| 726 | |
| 727 // Adjust bottom to point to the largest address within the same page, it | |
| 728 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
| 729 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
| 730 bottom += os::Linux::page_size() - 1; | |
| 731 | |
| 732 // sp might be slightly above current stack pointer; if that's the case, we | |
| 733 // will alloca() a little more space than necessary, which is OK. Don't use | |
| 734 // os::current_stack_pointer(), as its result can be slightly below current | |
| 735 // stack pointer, causing us to not alloca enough to reach "bottom". | |
| 736 sp = (address)&sp; | |
| 737 | |
| 738 if (sp > bottom) { | |
| 739 size = sp - bottom; | |
| 740 p = (volatile char *)alloca(size); | |
| 741 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
| 742 p[0] = '\0'; | |
| 743 } | |
| 744 } | |
| 745 | |
| 746 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
| 747 assert(t!=NULL, "just checking"); | |
| 748 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
| 749 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
| 750 | |
| 751 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
| 752 sigset_t mask_all, old_sigset; | |
| 753 sigfillset(&mask_all); | |
| 754 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
| 755 _expand_stack_to(addr); | |
| 756 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
| 757 return true; | |
| 758 } | |
| 759 return false; | |
| 760 } | |
| 761 | |
| 762 ////////////////////////////////////////////////////////////////////////////// | |
| 763 // create new thread | |
| 764 | |
| 765 static address highest_vm_reserved_address(); | |
| 766 | |
| 767 // check if it's safe to start a new thread | |
| 768 static bool _thread_safety_check(Thread* thread) { | |
| 769 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
| 770 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
| 771 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
| 772 // allocated (MAP_FIXED) from high address space. Every thread stack | |
| 773 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
| 774 // it to other values if they rebuild LinuxThreads). | |
| 775 // | |
| 776 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
| 777 // the memory region has already been mmap'ed. That means if we have too | |
| 778 // many threads and/or very large heap, eventually thread stack will | |
| 779 // collide with heap. | |
| 780 // | |
| 781 // Here we try to prevent heap/stack collision by comparing current | |
| 782 // stack bottom with the highest address that has been mmap'ed by JVM | |
| 783 // plus a safety margin for memory maps created by native code. | |
| 784 // | |
| 785 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
| 786 // | |
| 787 if (ThreadSafetyMargin > 0) { | |
| 788 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
| 789 | |
| 790 // not safe if our stack extends below the safety margin | |
| 791 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
| 792 } else { | |
| 793 return true; | |
| 794 } | |
| 795 } else { | |
| 796 // Floating stack LinuxThreads or NPTL: | |
| 797 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
| 798 // there's not enough space left, pthread_create() will fail. If we come | |
| 799 // here, that means enough space has been reserved for stack. | |
| 800 return true; | |
| 801 } | |
| 802 } | |
| 803 | |
| 804 // Thread start routine for all newly created threads | |
| 805 static void *java_start(Thread *thread) { | |
| 806 // Try to randomize the cache line index of hot stack frames. | |
| 807 // This helps when threads of the same stack traces evict each other's | |
| 808 // cache lines. The threads can be either from the same JVM instance, or | |
| 809 // from different JVM instances. The benefit is especially true for | |
| 810 // processors with hyperthreading technology. | |
| 811 static int counter = 0; | |
| 812 int pid = os::current_process_id(); | |
| 813 alloca(((pid ^ counter++) & 7) * 128); | |
| 814 | |
| 815 ThreadLocalStorage::set_thread(thread); | |
| 816 | |
| 817 OSThread* osthread = thread->osthread(); | |
| 818 Monitor* sync = osthread->startThread_lock(); | |
| 819 | |
| 820 // non floating stack LinuxThreads needs extra check, see above | |
| 821 if (!_thread_safety_check(thread)) { | |
| 822 // notify parent thread | |
| 823 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 824 osthread->set_state(ZOMBIE); | |
| 825 sync->notify_all(); | |
| 826 return NULL; | |
| 827 } | |
| 828 | |
| 829 // thread_id is kernel thread id (similar to Solaris LWP id) | |
| 830 osthread->set_thread_id(os::Linux::gettid()); | |
| 831 | |
| 832 if (UseNUMA) { | |
| 833 int lgrp_id = os::numa_get_group_id(); | |
| 834 if (lgrp_id != -1) { | |
| 835 thread->set_lgrp_id(lgrp_id); | |
| 836 } | |
| 837 } | |
| 838 // initialize signal mask for this thread | |
| 839 os::Linux::hotspot_sigmask(thread); | |
| 840 | |
| 841 // initialize floating point control register | |
| 842 os::Linux::init_thread_fpu_state(); | |
| 843 | |
| 844 // handshaking with parent thread | |
| 845 { | |
| 846 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 847 | |
| 848 // notify parent thread | |
| 849 osthread->set_state(INITIALIZED); | |
| 850 sync->notify_all(); | |
| 851 | |
| 852 // wait until os::start_thread() | |
| 853 while (osthread->get_state() == INITIALIZED) { | |
| 854 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 855 } | |
| 856 } | |
| 857 | |
| 858 // call one more level start routine | |
| 859 thread->run(); | |
| 860 | |
| 861 return 0; | |
| 862 } | |
| 863 | |
| 864 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 865 assert(thread->osthread() == NULL, "caller responsible"); | |
| 866 | |
| 867 // Allocate the OSThread object | |
| 868 OSThread* osthread = new OSThread(NULL, NULL); | |
| 869 if (osthread == NULL) { | |
| 870 return false; | |
| 871 } | |
| 872 | |
| 873 // set the correct thread state | |
| 874 osthread->set_thread_type(thr_type); | |
| 875 | |
| 876 // Initial state is ALLOCATED but not INITIALIZED | |
| 877 osthread->set_state(ALLOCATED); | |
| 878 | |
| 879 thread->set_osthread(osthread); | |
| 880 | |
| 881 // init thread attributes | |
| 882 pthread_attr_t attr; | |
| 883 pthread_attr_init(&attr); | |
| 884 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 885 | |
| 886 // stack size | |
| 887 if (os::Linux::supports_variable_stack_size()) { | |
| 888 // calculate stack size if it's not specified by caller | |
| 889 if (stack_size == 0) { | |
| 890 stack_size = os::Linux::default_stack_size(thr_type); | |
| 891 | |
| 892 switch (thr_type) { | |
| 893 case os::java_thread: | |
|
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895 // changed with the flag -Xss |
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896 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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897 stack_size = JavaThread::stack_size_at_create(); |
| 0 | 898 break; |
| 899 case os::compiler_thread: | |
| 900 if (CompilerThreadStackSize > 0) { | |
| 901 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 902 break; | |
| 903 } // else fall through: | |
| 904 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 905 case os::vm_thread: | |
| 906 case os::pgc_thread: | |
| 907 case os::cgc_thread: | |
| 908 case os::watcher_thread: | |
| 909 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 910 break; | |
| 911 } | |
| 912 } | |
| 913 | |
| 914 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
| 915 pthread_attr_setstacksize(&attr, stack_size); | |
| 916 } else { | |
| 917 // let pthread_create() pick the default value. | |
| 918 } | |
| 919 | |
| 920 // glibc guard page | |
| 921 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
| 922 | |
| 923 ThreadState state; | |
| 924 | |
| 925 { | |
| 926 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
| 927 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
| 928 if (lock) { | |
| 929 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
| 930 } | |
| 931 | |
| 932 pthread_t tid; | |
| 933 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 934 | |
| 935 pthread_attr_destroy(&attr); | |
| 936 | |
| 937 if (ret != 0) { | |
| 938 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 939 perror("pthread_create()"); | |
| 940 } | |
| 941 // Need to clean up stuff we've allocated so far | |
| 942 thread->set_osthread(NULL); | |
| 943 delete osthread; | |
| 944 if (lock) os::Linux::createThread_lock()->unlock(); | |
| 945 return false; | |
| 946 } | |
| 947 | |
| 948 // Store pthread info into the OSThread | |
| 949 osthread->set_pthread_id(tid); | |
| 950 | |
| 951 // Wait until child thread is either initialized or aborted | |
| 952 { | |
| 953 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 954 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 955 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 956 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 957 } | |
| 958 } | |
| 959 | |
| 960 if (lock) { | |
| 961 os::Linux::createThread_lock()->unlock(); | |
| 962 } | |
| 963 } | |
| 964 | |
| 965 // Aborted due to thread limit being reached | |
| 966 if (state == ZOMBIE) { | |
| 967 thread->set_osthread(NULL); | |
| 968 delete osthread; | |
| 969 return false; | |
| 970 } | |
| 971 | |
| 972 // The thread is returned suspended (in state INITIALIZED), | |
| 973 // and is started higher up in the call chain | |
| 974 assert(state == INITIALIZED, "race condition"); | |
| 975 return true; | |
| 976 } | |
| 977 | |
| 978 ///////////////////////////////////////////////////////////////////////////// | |
| 979 // attach existing thread | |
| 980 | |
| 981 // bootstrap the main thread | |
| 982 bool os::create_main_thread(JavaThread* thread) { | |
| 983 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 984 return create_attached_thread(thread); | |
| 985 } | |
| 986 | |
| 987 bool os::create_attached_thread(JavaThread* thread) { | |
| 988 #ifdef ASSERT | |
| 989 thread->verify_not_published(); | |
| 990 #endif | |
| 991 | |
| 992 // Allocate the OSThread object | |
| 993 OSThread* osthread = new OSThread(NULL, NULL); | |
| 994 | |
| 995 if (osthread == NULL) { | |
| 996 return false; | |
| 997 } | |
| 998 | |
| 999 // Store pthread info into the OSThread | |
| 1000 osthread->set_thread_id(os::Linux::gettid()); | |
| 1001 osthread->set_pthread_id(::pthread_self()); | |
| 1002 | |
| 1003 // initialize floating point control register | |
| 1004 os::Linux::init_thread_fpu_state(); | |
| 1005 | |
| 1006 // Initial thread state is RUNNABLE | |
| 1007 osthread->set_state(RUNNABLE); | |
| 1008 | |
| 1009 thread->set_osthread(osthread); | |
| 1010 | |
| 1011 if (UseNUMA) { | |
| 1012 int lgrp_id = os::numa_get_group_id(); | |
| 1013 if (lgrp_id != -1) { | |
| 1014 thread->set_lgrp_id(lgrp_id); | |
| 1015 } | |
| 1016 } | |
| 1017 | |
| 1018 if (os::Linux::is_initial_thread()) { | |
| 1019 // If current thread is initial thread, its stack is mapped on demand, | |
| 1020 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
| 1021 // the entire stack region to avoid SEGV in stack banging. | |
| 1022 // It is also useful to get around the heap-stack-gap problem on SuSE | |
| 1023 // kernel (see 4821821 for details). We first expand stack to the top | |
| 1024 // of yellow zone, then enable stack yellow zone (order is significant, | |
| 1025 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
| 1026 // is no gap between the last two virtual memory regions. | |
| 1027 | |
| 1028 JavaThread *jt = (JavaThread *)thread; | |
| 1029 address addr = jt->stack_yellow_zone_base(); | |
| 1030 assert(addr != NULL, "initialization problem?"); | |
| 1031 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
| 1032 | |
| 1033 osthread->set_expanding_stack(); | |
| 1034 os::Linux::manually_expand_stack(jt, addr); | |
| 1035 osthread->clear_expanding_stack(); | |
| 1036 } | |
| 1037 | |
| 1038 // initialize signal mask for this thread | |
| 1039 // and save the caller's signal mask | |
| 1040 os::Linux::hotspot_sigmask(thread); | |
| 1041 | |
| 1042 return true; | |
| 1043 } | |
| 1044 | |
| 1045 void os::pd_start_thread(Thread* thread) { | |
| 1046 OSThread * osthread = thread->osthread(); | |
| 1047 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 1048 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 1049 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 1050 sync_with_child->notify(); | |
| 1051 } | |
| 1052 | |
| 1053 // Free Linux resources related to the OSThread | |
| 1054 void os::free_thread(OSThread* osthread) { | |
| 1055 assert(osthread != NULL, "osthread not set"); | |
| 1056 | |
| 1057 if (Thread::current()->osthread() == osthread) { | |
| 1058 // Restore caller's signal mask | |
| 1059 sigset_t sigmask = osthread->caller_sigmask(); | |
| 1060 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 1061 } | |
| 1062 | |
| 1063 delete osthread; | |
| 1064 } | |
| 1065 | |
| 1066 ////////////////////////////////////////////////////////////////////////////// | |
| 1067 // thread local storage | |
| 1068 | |
| 1069 int os::allocate_thread_local_storage() { | |
| 1070 pthread_key_t key; | |
| 1071 int rslt = pthread_key_create(&key, NULL); | |
| 1072 assert(rslt == 0, "cannot allocate thread local storage"); | |
| 1073 return (int)key; | |
| 1074 } | |
| 1075 | |
| 1076 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 1077 // on VM exit. | |
| 1078 void os::free_thread_local_storage(int index) { | |
| 1079 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 1080 assert(rslt == 0, "invalid index"); | |
| 1081 } | |
| 1082 | |
| 1083 void os::thread_local_storage_at_put(int index, void* value) { | |
| 1084 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 1085 assert(rslt == 0, "pthread_setspecific failed"); | |
| 1086 } | |
| 1087 | |
| 1088 extern "C" Thread* get_thread() { | |
| 1089 return ThreadLocalStorage::thread(); | |
| 1090 } | |
| 1091 | |
| 1092 ////////////////////////////////////////////////////////////////////////////// | |
| 1093 // initial thread | |
| 1094 | |
| 1095 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
| 1096 bool os::Linux::is_initial_thread(void) { | |
| 1097 char dummy; | |
| 1098 // If called before init complete, thread stack bottom will be null. | |
| 1099 // Can be called if fatal error occurs before initialization. | |
| 1100 if (initial_thread_stack_bottom() == NULL) return false; | |
| 1101 assert(initial_thread_stack_bottom() != NULL && | |
| 1102 initial_thread_stack_size() != 0, | |
| 1103 "os::init did not locate initial thread's stack region"); | |
| 1104 if ((address)&dummy >= initial_thread_stack_bottom() && | |
| 1105 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
| 1106 return true; | |
| 1107 else return false; | |
| 1108 } | |
| 1109 | |
| 1110 // Find the virtual memory area that contains addr | |
| 1111 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
| 1112 FILE *fp = fopen("/proc/self/maps", "r"); | |
| 1113 if (fp) { | |
| 1114 address low, high; | |
| 1115 while (!feof(fp)) { | |
| 1116 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
| 1117 if (low <= addr && addr < high) { | |
| 1118 if (vma_low) *vma_low = low; | |
| 1119 if (vma_high) *vma_high = high; | |
| 1120 fclose (fp); | |
| 1121 return true; | |
| 1122 } | |
| 1123 } | |
| 1124 for (;;) { | |
| 1125 int ch = fgetc(fp); | |
| 1126 if (ch == EOF || ch == (int)'\n') break; | |
| 1127 } | |
| 1128 } | |
| 1129 fclose(fp); | |
| 1130 } | |
| 1131 return false; | |
| 1132 } | |
| 1133 | |
| 1134 // Locate initial thread stack. This special handling of initial thread stack | |
| 1135 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
| 1136 // bogus value for initial thread. | |
| 1137 void os::Linux::capture_initial_stack(size_t max_size) { | |
| 1138 // stack size is the easy part, get it from RLIMIT_STACK | |
| 1139 size_t stack_size; | |
| 1140 struct rlimit rlim; | |
| 1141 getrlimit(RLIMIT_STACK, &rlim); | |
| 1142 stack_size = rlim.rlim_cur; | |
| 1143 | |
| 1144 // 6308388: a bug in ld.so will relocate its own .data section to the | |
| 1145 // lower end of primordial stack; reduce ulimit -s value a little bit | |
| 1146 // so we won't install guard page on ld.so's data section. | |
| 1147 stack_size -= 2 * page_size(); | |
| 1148 | |
| 1149 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
| 1150 // 7.1, in both cases we will get 2G in return value. | |
| 1151 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
| 1152 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
| 1153 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
| 1154 // in case other parts in glibc still assumes 2M max stack size. | |
| 1155 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
| 1156 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
| 7994 | 1157 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
| 1158 stack_size = 2 * K * K IA64_ONLY(*2); | |
| 0 | 1159 // Try to figure out where the stack base (top) is. This is harder. |
| 1160 // | |
| 1161 // When an application is started, glibc saves the initial stack pointer in | |
| 1162 // a global variable "__libc_stack_end", which is then used by system | |
| 1163 // libraries. __libc_stack_end should be pretty close to stack top. The | |
| 1164 // variable is available since the very early days. However, because it is | |
| 1165 // a private interface, it could disappear in the future. | |
| 1166 // | |
| 1167 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
| 1168 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
| 1169 // stack top. Note that /proc may not exist if VM is running as a chroot | |
| 1170 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
| 1171 // /proc/<pid>/stat could change in the future (though unlikely). | |
| 1172 // | |
| 1173 // We try __libc_stack_end first. If that doesn't work, look for | |
| 1174 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
| 1175 // as a hint, which should work well in most cases. | |
| 1176 | |
| 1177 uintptr_t stack_start; | |
| 1178 | |
| 1179 // try __libc_stack_end first | |
| 1180 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
| 1181 if (p && *p) { | |
| 1182 stack_start = *p; | |
| 1183 } else { | |
| 1184 // see if we can get the start_stack field from /proc/self/stat | |
| 1185 FILE *fp; | |
| 1186 int pid; | |
| 1187 char state; | |
| 1188 int ppid; | |
| 1189 int pgrp; | |
| 1190 int session; | |
| 1191 int nr; | |
| 1192 int tpgrp; | |
| 1193 unsigned long flags; | |
| 1194 unsigned long minflt; | |
| 1195 unsigned long cminflt; | |
| 1196 unsigned long majflt; | |
| 1197 unsigned long cmajflt; | |
| 1198 unsigned long utime; | |
| 1199 unsigned long stime; | |
| 1200 long cutime; | |
| 1201 long cstime; | |
| 1202 long prio; | |
| 1203 long nice; | |
| 1204 long junk; | |
| 1205 long it_real; | |
| 1206 uintptr_t start; | |
| 1207 uintptr_t vsize; | |
|
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1209 uintptr_t rsslim; |
| 0 | 1210 uintptr_t scodes; |
| 1211 uintptr_t ecode; | |
| 1212 int i; | |
| 1213 | |
| 1214 // Figure what the primordial thread stack base is. Code is inspired | |
| 1215 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
| 1216 // followed by command name surrounded by parentheses, state, etc. | |
| 1217 char stat[2048]; | |
| 1218 int statlen; | |
| 1219 | |
| 1220 fp = fopen("/proc/self/stat", "r"); | |
| 1221 if (fp) { | |
| 1222 statlen = fread(stat, 1, 2047, fp); | |
| 1223 stat[statlen] = '\0'; | |
| 1224 fclose(fp); | |
| 1225 | |
| 1226 // Skip pid and the command string. Note that we could be dealing with | |
| 1227 // weird command names, e.g. user could decide to rename java launcher | |
| 1228 // to "java 1.4.2 :)", then the stat file would look like | |
| 1229 // 1234 (java 1.4.2 :)) R ... ... | |
| 1230 // We don't really need to know the command string, just find the last | |
| 1231 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
| 1232 char * s = strrchr(stat, ')'); | |
| 1233 | |
| 1234 i = 0; | |
| 1235 if (s) { | |
| 1236 // Skip blank chars | |
| 1237 do s++; while (isspace(*s)); | |
| 1238 | |
|
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1239 #define _UFM UINTX_FORMAT |
|
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1240 #define _DFM INTX_FORMAT |
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1241 |
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1242 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
|
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1243 /* 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 */ |
|
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1244 i = sscanf(s, "%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld " _UFM _UFM _DFM _UFM _UFM _UFM _UFM, |
| 0 | 1245 &state, /* 3 %c */ |
| 1246 &ppid, /* 4 %d */ | |
| 1247 &pgrp, /* 5 %d */ | |
| 1248 &session, /* 6 %d */ | |
| 1249 &nr, /* 7 %d */ | |
| 1250 &tpgrp, /* 8 %d */ | |
| 1251 &flags, /* 9 %lu */ | |
| 1252 &minflt, /* 10 %lu */ | |
| 1253 &cminflt, /* 11 %lu */ | |
| 1254 &majflt, /* 12 %lu */ | |
| 1255 &cmajflt, /* 13 %lu */ | |
| 1256 &utime, /* 14 %lu */ | |
| 1257 &stime, /* 15 %lu */ | |
| 1258 &cutime, /* 16 %ld */ | |
| 1259 &cstime, /* 17 %ld */ | |
| 1260 &prio, /* 18 %ld */ | |
| 1261 &nice, /* 19 %ld */ | |
| 1262 &junk, /* 20 %ld */ | |
| 1263 &it_real, /* 21 %ld */ | |
|
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1264 &start, /* 22 UINTX_FORMAT */ |
|
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1265 &vsize, /* 23 UINTX_FORMAT */ |
|
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1266 &rss, /* 24 INTX_FORMAT */ |
|
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1267 &rsslim, /* 25 UINTX_FORMAT */ |
|
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1268 &scodes, /* 26 UINTX_FORMAT */ |
|
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1269 &ecode, /* 27 UINTX_FORMAT */ |
|
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1270 &stack_start); /* 28 UINTX_FORMAT */ |
| 0 | 1271 } |
| 1272 | |
|
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1273 #undef _UFM |
|
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1274 #undef _DFM |
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1275 |
| 0 | 1276 if (i != 28 - 2) { |
| 1277 assert(false, "Bad conversion from /proc/self/stat"); | |
| 1278 // product mode - assume we are the initial thread, good luck in the | |
| 1279 // embedded case. | |
| 1280 warning("Can't detect initial thread stack location - bad conversion"); | |
| 1281 stack_start = (uintptr_t) &rlim; | |
| 1282 } | |
| 1283 } else { | |
| 1284 // For some reason we can't open /proc/self/stat (for example, running on | |
| 1285 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
| 1286 // most cases, so don't abort: | |
| 1287 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
| 1288 stack_start = (uintptr_t) &rlim; | |
| 1289 } | |
| 1290 } | |
| 1291 | |
| 1292 // Now we have a pointer (stack_start) very close to the stack top, the | |
| 1293 // next thing to do is to figure out the exact location of stack top. We | |
| 1294 // can find out the virtual memory area that contains stack_start by | |
| 1295 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
| 1296 // and its upper limit is the real stack top. (again, this would fail if | |
| 1297 // running inside chroot, because /proc may not exist.) | |
| 1298 | |
| 1299 uintptr_t stack_top; | |
| 1300 address low, high; | |
| 1301 if (find_vma((address)stack_start, &low, &high)) { | |
| 1302 // success, "high" is the true stack top. (ignore "low", because initial | |
| 1303 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
| 1304 stack_top = (uintptr_t)high; | |
| 1305 } else { | |
| 1306 // failed, likely because /proc/self/maps does not exist | |
| 1307 warning("Can't detect initial thread stack location - find_vma failed"); | |
| 1308 // best effort: stack_start is normally within a few pages below the real | |
| 1309 // stack top, use it as stack top, and reduce stack size so we won't put | |
| 1310 // guard page outside stack. | |
| 1311 stack_top = stack_start; | |
| 1312 stack_size -= 16 * page_size(); | |
| 1313 } | |
| 1314 | |
| 1315 // stack_top could be partially down the page so align it | |
| 1316 stack_top = align_size_up(stack_top, page_size()); | |
| 1317 | |
| 1318 if (max_size && stack_size > max_size) { | |
| 1319 _initial_thread_stack_size = max_size; | |
| 1320 } else { | |
| 1321 _initial_thread_stack_size = stack_size; | |
| 1322 } | |
| 1323 | |
| 1324 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
| 1325 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
| 1326 } | |
| 1327 | |
| 1328 //////////////////////////////////////////////////////////////////////////////// | |
| 1329 // time support | |
| 1330 | |
| 1331 // Time since start-up in seconds to a fine granularity. | |
| 1332 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 1333 double os::elapsedTime() { | |
| 1334 | |
| 1335 return (double)(os::elapsed_counter()) * 0.000001; | |
| 1336 } | |
| 1337 | |
| 1338 jlong os::elapsed_counter() { | |
| 1339 timeval time; | |
| 1340 int status = gettimeofday(&time, NULL); | |
| 1341 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
| 1342 } | |
| 1343 | |
| 1344 jlong os::elapsed_frequency() { | |
| 1345 return (1000 * 1000); | |
| 1346 } | |
| 1347 | |
|
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1348 bool os::supports_vtime() { return true; } |
|
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1349 bool os::enable_vtime() { return false; } |
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1350 bool os::vtime_enabled() { return false; } |
|
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1351 |
|
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1352 double os::elapsedVTime() { |
|
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1353 struct rusage usage; |
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1354 int retval = getrusage(RUSAGE_THREAD, &usage); |
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1355 if (retval == 0) { |
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1356 return (double) (usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) + (double) (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000 * 1000); |
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1357 } else { |
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1358 // better than nothing, but not much |
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1359 return elapsedTime(); |
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1360 } |
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1361 } |
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1362 |
| 61 | 1363 jlong os::javaTimeMillis() { |
| 0 | 1364 timeval time; |
| 1365 int status = gettimeofday(&time, NULL); | |
| 1366 assert(status != -1, "linux error"); | |
| 1367 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 1368 } | |
| 1369 | |
| 1370 #ifndef CLOCK_MONOTONIC | |
| 1371 #define CLOCK_MONOTONIC (1) | |
| 1372 #endif | |
| 1373 | |
| 1374 void os::Linux::clock_init() { | |
| 1375 // we do dlopen's in this particular order due to bug in linux | |
| 1376 // dynamical loader (see 6348968) leading to crash on exit | |
| 1377 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
| 1378 if (handle == NULL) { | |
| 1379 handle = dlopen("librt.so", RTLD_LAZY); | |
| 1380 } | |
| 1381 | |
| 1382 if (handle) { | |
| 1383 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
| 1384 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
| 1385 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
| 1386 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
| 1387 if (clock_getres_func && clock_gettime_func) { | |
| 1388 // See if monotonic clock is supported by the kernel. Note that some | |
| 1389 // early implementations simply return kernel jiffies (updated every | |
| 1390 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
| 1391 // for nano time (though the monotonic property is still nice to have). | |
| 1392 // It's fixed in newer kernels, however clock_getres() still returns | |
| 1393 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
| 1394 // resolution for now. Hopefully as people move to new kernels, this | |
| 1395 // won't be a problem. | |
| 1396 struct timespec res; | |
| 1397 struct timespec tp; | |
| 1398 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
| 1399 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
| 1400 // yes, monotonic clock is supported | |
| 1401 _clock_gettime = clock_gettime_func; | |
| 1402 } else { | |
| 1403 // close librt if there is no monotonic clock | |
| 1404 dlclose(handle); | |
| 1405 } | |
| 1406 } | |
| 1407 } | |
| 1408 } | |
| 1409 | |
| 1410 #ifndef SYS_clock_getres | |
| 1411 | |
| 1412 #if defined(IA32) || defined(AMD64) | |
| 1413 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
|
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1414 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
| 0 | 1415 #else |
|
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1416 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
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1417 #define sys_clock_getres(x,y) -1 |
| 0 | 1418 #endif |
| 1419 | |
|
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1420 #else |
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1421 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
| 0 | 1422 #endif |
| 1423 | |
| 1424 void os::Linux::fast_thread_clock_init() { | |
| 1425 if (!UseLinuxPosixThreadCPUClocks) { | |
| 1426 return; | |
| 1427 } | |
| 1428 clockid_t clockid; | |
| 1429 struct timespec tp; | |
| 1430 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
| 1431 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
| 1432 | |
| 1433 // Switch to using fast clocks for thread cpu time if | |
| 1434 // the sys_clock_getres() returns 0 error code. | |
| 1435 // Note, that some kernels may support the current thread | |
| 1436 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
| 1437 // returned by the pthread_getcpuclockid(). | |
| 1438 // If the fast Posix clocks are supported then the sys_clock_getres() | |
| 1439 // must return at least tp.tv_sec == 0 which means a resolution | |
| 1440 // better than 1 sec. This is extra check for reliability. | |
| 1441 | |
| 1442 if(pthread_getcpuclockid_func && | |
| 1443 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
| 1444 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
| 1445 | |
| 1446 _supports_fast_thread_cpu_time = true; | |
| 1447 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
| 1448 } | |
| 1449 } | |
| 1450 | |
| 1451 jlong os::javaTimeNanos() { | |
| 1452 if (Linux::supports_monotonic_clock()) { | |
| 1453 struct timespec tp; | |
| 1454 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 1455 assert(status == 0, "gettime error"); | |
| 1456 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 1457 return result; | |
| 1458 } else { | |
| 1459 timeval time; | |
| 1460 int status = gettimeofday(&time, NULL); | |
| 1461 assert(status != -1, "linux error"); | |
| 1462 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 1463 return 1000 * usecs; | |
| 1464 } | |
| 1465 } | |
| 1466 | |
| 1467 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 1468 if (Linux::supports_monotonic_clock()) { | |
| 1469 info_ptr->max_value = ALL_64_BITS; | |
| 1470 | |
| 1471 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 1472 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 1473 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 1474 } else { | |
| 1475 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 1476 info_ptr->max_value = ALL_64_BITS; | |
| 1477 | |
| 1478 // gettimeofday is a real time clock so it skips | |
| 1479 info_ptr->may_skip_backward = true; | |
| 1480 info_ptr->may_skip_forward = true; | |
| 1481 } | |
| 1482 | |
| 1483 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1484 } | |
| 1485 | |
| 1486 // Return the real, user, and system times in seconds from an | |
| 1487 // arbitrary fixed point in the past. | |
| 1488 bool os::getTimesSecs(double* process_real_time, | |
| 1489 double* process_user_time, | |
| 1490 double* process_system_time) { | |
| 1491 struct tms ticks; | |
| 1492 clock_t real_ticks = times(&ticks); | |
| 1493 | |
| 1494 if (real_ticks == (clock_t) (-1)) { | |
| 1495 return false; | |
| 1496 } else { | |
| 1497 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1498 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1499 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1500 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1501 | |
| 1502 return true; | |
| 1503 } | |
| 1504 } | |
| 1505 | |
| 1506 | |
| 1507 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1508 struct tm t; | |
| 1509 time_t long_time; | |
| 1510 time(&long_time); | |
| 1511 localtime_r(&long_time, &t); | |
| 1512 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1513 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1514 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1515 return buf; | |
| 1516 } | |
| 1517 | |
|
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1518 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
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1519 return localtime_r(clock, res); |
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1520 } |
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1521 |
| 0 | 1522 //////////////////////////////////////////////////////////////////////////////// |
| 1523 // runtime exit support | |
| 1524 | |
| 1525 // Note: os::shutdown() might be called very early during initialization, or | |
| 1526 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1527 // sure it is async-safe and can handle partially initialized VM. | |
| 1528 void os::shutdown() { | |
| 1529 | |
| 1530 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1531 perfMemory_exit(); | |
| 1532 | |
| 1533 // needs to remove object in file system | |
| 1534 AttachListener::abort(); | |
| 1535 | |
| 1536 // flush buffered output, finish log files | |
| 1537 ostream_abort(); | |
| 1538 | |
| 1539 // Check for abort hook | |
| 1540 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1541 if (abort_hook != NULL) { | |
| 1542 abort_hook(); | |
| 1543 } | |
| 1544 | |
| 1545 } | |
| 1546 | |
| 1547 // Note: os::abort() might be called very early during initialization, or | |
| 1548 // called from signal handler. Before adding something to os::abort(), make | |
| 1549 // sure it is async-safe and can handle partially initialized VM. | |
| 1550 void os::abort(bool dump_core) { | |
| 1551 os::shutdown(); | |
| 1552 if (dump_core) { | |
| 1553 #ifndef PRODUCT | |
| 1554 fdStream out(defaultStream::output_fd()); | |
| 1555 out.print_raw("Current thread is "); | |
| 1556 char buf[16]; | |
| 1557 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1558 out.print_raw_cr(buf); | |
| 1559 out.print_raw_cr("Dumping core ..."); | |
| 1560 #endif | |
| 1561 ::abort(); // dump core | |
| 1562 } | |
| 1563 | |
| 1564 ::exit(1); | |
| 1565 } | |
| 1566 | |
| 1567 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1568 void os::die() { | |
| 1569 // _exit() on LinuxThreads only kills current thread | |
| 1570 ::abort(); | |
| 1571 } | |
| 1572 | |
| 1573 // unused on linux for now. | |
| 1574 void os::set_error_file(const char *logfile) {} | |
| 1575 | |
|
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1576 |
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1577 // This method is a copy of JDK's sysGetLastErrorString |
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1578 // from src/solaris/hpi/src/system_md.c |
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diff
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|
1579 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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|
1580 size_t os::lasterror(char *buf, size_t len) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
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|
1581 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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|
1582 if (errno == 0) return 0; |
|
828eafbd85cc
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ikrylov
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1972
diff
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|
1583 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
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|
1584 const char *s = ::strerror(errno); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1585 size_t n = ::strlen(s); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1586 if (n >= len) { |
|
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6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1587 n = len - 1; |
|
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6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
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|
1588 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1589 ::strncpy(buf, s, n); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1590 buf[n] = '\0'; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
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|
1591 return n; |
|
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6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1592 } |
|
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diff
changeset
|
1593 |
| 0 | 1594 intx os::current_thread_id() { return (intx)pthread_self(); } |
| 1595 int os::current_process_id() { | |
| 1596 | |
| 1597 // Under the old linux thread library, linux gives each thread | |
| 1598 // its own process id. Because of this each thread will return | |
| 1599 // a different pid if this method were to return the result | |
| 1600 // of getpid(2). Linux provides no api that returns the pid | |
| 1601 // of the launcher thread for the vm. This implementation | |
| 1602 // returns a unique pid, the pid of the launcher thread | |
| 1603 // that starts the vm 'process'. | |
| 1604 | |
| 1605 // Under the NPTL, getpid() returns the same pid as the | |
| 1606 // launcher thread rather than a unique pid per thread. | |
| 1607 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1608 | |
| 1609 // if you are looking for the result of a call to getpid() that | |
| 1610 // returns a unique pid for the calling thread, then look at the | |
| 1611 // OSThread::thread_id() method in osThread_linux.hpp file | |
| 1612 | |
| 1613 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1614 } | |
| 1615 | |
| 1616 // DLL functions | |
| 1617 | |
| 1618 const char* os::dll_file_extension() { return ".so"; } | |
| 1619 | |
|
2130
34d64ad817f4
7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined
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diff
changeset
|
1620 // This must be hard coded because it's the system's temporary |
|
34d64ad817f4
7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined
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2033
diff
changeset
|
1621 // directory not the java application's temp directory, ala java.io.tmpdir. |
|
34d64ad817f4
7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined
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diff
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|
1622 const char* os::get_temp_directory() { return "/tmp"; } |
| 0 | 1623 |
| 691 | 1624 static bool file_exists(const char* filename) { |
| 1625 struct stat statbuf; | |
| 1626 if (filename == NULL || strlen(filename) == 0) { | |
| 1627 return false; | |
| 1628 } | |
| 1629 return os::stat(filename, &statbuf) == 0; | |
| 1630 } | |
| 1631 | |
|
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6cb0d32b828b
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changeset
|
1632 bool os::dll_build_name(char* buffer, size_t buflen, |
| 691 | 1633 const char* pname, const char* fname) { |
|
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changeset
|
1634 bool retval = false; |
| 691 | 1635 // Copied from libhpi |
| 242 | 1636 const size_t pnamelen = pname ? strlen(pname) : 0; |
| 1637 | |
|
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|
1638 // Return error on buffer overflow. |
| 242 | 1639 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
|
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changeset
|
1640 return retval; |
| 242 | 1641 } |
| 1642 | |
| 1643 if (pnamelen == 0) { | |
| 691 | 1644 snprintf(buffer, buflen, "lib%s.so", fname); |
|
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diff
changeset
|
1645 retval = true; |
| 691 | 1646 } else if (strchr(pname, *os::path_separator()) != NULL) { |
| 1647 int n; | |
| 1648 char** pelements = split_path(pname, &n); | |
|
9059
17bf4d428955
8006103: [parfait] Possible null pointer dereference at hotspot/src/os/linux/vm/os_linux.cpp; os_windows.cpp; os_solaris.cpp; os_bsd.cpp
ccheung
parents:
8812
diff
changeset
|
1649 if (pelements == NULL) { |
| 9062 | 1650 return false; |
|
9059
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8006103: [parfait] Possible null pointer dereference at hotspot/src/os/linux/vm/os_linux.cpp; os_windows.cpp; os_solaris.cpp; os_bsd.cpp
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diff
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|
1651 } |
| 691 | 1652 for (int i = 0 ; i < n ; i++) { |
| 1653 // Really shouldn't be NULL, but check can't hurt | |
| 1654 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1655 continue; // skip the empty path values | |
| 1656 } | |
| 1657 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
| 1658 if (file_exists(buffer)) { | |
|
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|
1659 retval = true; |
| 691 | 1660 break; |
| 1661 } | |
| 1662 } | |
| 1663 // release the storage | |
| 1664 for (int i = 0 ; i < n ; i++) { | |
| 1665 if (pelements[i] != NULL) { | |
| 6197 | 1666 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 691 | 1667 } |
| 1668 } | |
| 1669 if (pelements != NULL) { | |
| 6197 | 1670 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 691 | 1671 } |
| 242 | 1672 } else { |
| 691 | 1673 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
|
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|
1674 retval = true; |
|
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|
1675 } |
|
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|
1676 return retval; |
| 242 | 1677 } |
| 1678 | |
|
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
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changeset
|
1679 // check if addr is inside libjvm.so |
| 0 | 1680 bool os::address_is_in_vm(address addr) { |
| 1681 static address libjvm_base_addr; | |
| 1682 Dl_info dlinfo; | |
| 1683 | |
| 1684 if (libjvm_base_addr == NULL) { | |
| 1685 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
| 1686 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
| 1687 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
| 1688 } | |
| 1689 | |
| 1690 if (dladdr((void *)addr, &dlinfo)) { | |
| 1691 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
| 1692 } | |
| 1693 | |
| 1694 return false; | |
| 1695 } | |
| 1696 | |
| 1697 bool os::dll_address_to_function_name(address addr, char *buf, | |
| 1698 int buflen, int *offset) { | |
| 1699 Dl_info dlinfo; | |
| 1700 | |
| 1701 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { | |
|
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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|
1702 if (buf != NULL) { |
|
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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diff
changeset
|
1703 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
|
2d4762ec74af
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diff
changeset
|
1704 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
|
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|
1705 } |
|
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|
1706 } |
|
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diff
changeset
|
1707 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
| 0 | 1708 return true; |
|
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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diff
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|
1709 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { |
|
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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diff
changeset
|
1710 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
| 4803 | 1711 buf, buflen, offset, dlinfo.dli_fname)) { |
|
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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1972
diff
changeset
|
1712 return true; |
|
2d4762ec74af
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zgu
parents:
1972
diff
changeset
|
1713 } |
| 0 | 1714 } |
|
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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|
1715 |
|
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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changeset
|
1716 if (buf != NULL) buf[0] = '\0'; |
|
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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diff
changeset
|
1717 if (offset != NULL) *offset = -1; |
|
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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1972
diff
changeset
|
1718 return false; |
| 0 | 1719 } |
| 1720 | |
| 1721 struct _address_to_library_name { | |
| 1722 address addr; // input : memory address | |
| 1723 size_t buflen; // size of fname | |
| 1724 char* fname; // output: library name | |
| 1725 address base; // library base addr | |
| 1726 }; | |
| 1727 | |
| 1728 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
| 1729 size_t size, void *data) { | |
| 1730 int i; | |
| 1731 bool found = false; | |
| 1732 address libbase = NULL; | |
| 1733 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
| 1734 | |
| 1735 // iterate through all loadable segments | |
| 1736 for (i = 0; i < info->dlpi_phnum; i++) { | |
| 1737 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
| 1738 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
| 1739 // base address of a library is the lowest address of its loaded | |
| 1740 // segments. | |
| 1741 if (libbase == NULL || libbase > segbase) { | |
| 1742 libbase = segbase; | |
| 1743 } | |
| 1744 // see if 'addr' is within current segment | |
| 1745 if (segbase <= d->addr && | |
| 1746 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
| 1747 found = true; | |
| 1748 } | |
| 1749 } | |
| 1750 } | |
| 1751 | |
| 1752 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
| 1753 // so dll_address_to_library_name() can fall through to use dladdr() which | |
| 1754 // can figure out executable name from argv[0]. | |
| 1755 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
| 1756 d->base = libbase; | |
| 1757 if (d->fname) { | |
| 1758 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
| 1759 } | |
| 1760 return 1; | |
| 1761 } | |
| 1762 return 0; | |
| 1763 } | |
| 1764 | |
| 1765 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1766 int buflen, int* offset) { | |
| 1767 Dl_info dlinfo; | |
| 1768 struct _address_to_library_name data; | |
| 1769 | |
| 1770 // There is a bug in old glibc dladdr() implementation that it could resolve | |
| 1771 // to wrong library name if the .so file has a base address != NULL. Here | |
| 1772 // we iterate through the program headers of all loaded libraries to find | |
| 1773 // out which library 'addr' really belongs to. This workaround can be | |
| 1774 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
| 1775 data.addr = addr; | |
| 1776 data.fname = buf; | |
| 1777 data.buflen = buflen; | |
| 1778 data.base = NULL; | |
| 1779 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
| 1780 | |
| 1781 if (rslt) { | |
| 1782 // buf already contains library name | |
| 1783 if (offset) *offset = addr - data.base; | |
| 1784 return true; | |
| 1785 } else if (dladdr((void*)addr, &dlinfo)){ | |
| 1786 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
| 1787 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
| 1788 return true; | |
| 1789 } else { | |
| 1790 if (buf) buf[0] = '\0'; | |
| 1791 if (offset) *offset = -1; | |
| 1792 return false; | |
| 1793 } | |
| 1794 } | |
| 1795 | |
| 1796 // Loads .dll/.so and | |
| 1797 // in case of error it checks if .dll/.so was built for the | |
| 1798 // same architecture as Hotspot is running on | |
| 1799 | |
|
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1800 |
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1801 // Remember the stack's state. The Linux dynamic linker will change |
|
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1802 // the stack to 'executable' at most once, so we must safepoint only once. |
|
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1803 bool os::Linux::_stack_is_executable = false; |
|
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1804 |
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1805 // VM operation that loads a library. This is necessary if stack protection |
|
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|
1806 // of the Java stacks can be lost during loading the library. If we |
|
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1807 // do not stop the Java threads, they can stack overflow before the stacks |
|
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1808 // are protected again. |
|
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|
1809 class VM_LinuxDllLoad: public VM_Operation { |
|
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1810 private: |
|
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1811 const char *_filename; |
|
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1812 char *_ebuf; |
|
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1813 int _ebuflen; |
|
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1814 void *_lib; |
|
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1815 public: |
|
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1816 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
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1817 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
|
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1818 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
|
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1819 void doit() { |
|
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1820 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
|
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1821 os::Linux::_stack_is_executable = true; |
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1822 } |
|
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1823 void* loaded_library() { return _lib; } |
|
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1824 }; |
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|
1825 |
| 0 | 1826 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
| 1827 { | |
|
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|
1828 void * result = NULL; |
|
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|
1829 bool load_attempted = false; |
|
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|
1830 |
|
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|
1831 // Check whether the library to load might change execution rights |
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1832 // of the stack. If they are changed, the protection of the stack |
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1833 // guard pages will be lost. We need a safepoint to fix this. |
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1834 // |
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1835 // See Linux man page execstack(8) for more info. |
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1836 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
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1837 ElfFile ef(filename); |
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1838 if (!ef.specifies_noexecstack()) { |
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1839 if (!is_init_completed()) { |
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1840 os::Linux::_stack_is_executable = true; |
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1841 // This is OK - No Java threads have been created yet, and hence no |
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1842 // stack guard pages to fix. |
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1843 // |
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1844 // This should happen only when you are building JDK7 using a very |
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1845 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
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1846 // |
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1847 // Dynamic loader will make all stacks executable after |
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1848 // this function returns, and will not do that again. |
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1849 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
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1850 } else { |
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1851 warning("You have loaded library %s which might have disabled stack guard. " |
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1852 "The VM will try to fix the stack guard now.\n" |
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1853 "It's highly recommended that you fix the library with " |
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1854 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
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1855 filename); |
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1856 |
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1857 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
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1858 JavaThread *jt = JavaThread::current(); |
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1859 if (jt->thread_state() != _thread_in_native) { |
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1860 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
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1861 // that requires ExecStack. Cannot enter safe point. Let's give up. |
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1862 warning("Unable to fix stack guard. Giving up."); |
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1863 } else { |
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1864 if (!LoadExecStackDllInVMThread) { |
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1865 // This is for the case where the DLL has an static |
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1866 // constructor function that executes JNI code. We cannot |
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1867 // load such DLLs in the VMThread. |
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1868 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1869 } |
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1870 |
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1871 ThreadInVMfromNative tiv(jt); |
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1872 debug_only(VMNativeEntryWrapper vew;) |
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1873 |
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1874 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1875 VMThread::execute(&op); |
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1876 if (LoadExecStackDllInVMThread) { |
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1877 result = op.loaded_library(); |
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1878 } |
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1879 load_attempted = true; |
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1880 } |
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1881 } |
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1882 } |
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1883 } |
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1884 |
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1885 if (!load_attempted) { |
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1886 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1887 } |
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1888 |
| 0 | 1889 if (result != NULL) { |
| 1890 // Successful loading | |
| 1891 return result; | |
| 1892 } | |
| 1893 | |
| 1894 Elf32_Ehdr elf_head; | |
| 1895 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 1896 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 1897 | |
| 1898 if (diag_msg_max_length==0) { | |
| 1899 // No more space in ebuf for additional diagnostics message | |
| 1900 return NULL; | |
| 1901 } | |
| 1902 | |
| 1903 | |
| 1904 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 1905 | |
| 1906 if (file_descriptor < 0) { | |
| 1907 // Can't open library, report dlerror() message | |
| 1908 return NULL; | |
| 1909 } | |
| 1910 | |
| 1911 bool failed_to_read_elf_head= | |
| 1912 (sizeof(elf_head)!= | |
| 1913 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 1914 | |
| 1915 ::close(file_descriptor); | |
| 1916 if (failed_to_read_elf_head) { | |
| 1917 // file i/o error - report dlerror() msg | |
| 1918 return NULL; | |
| 1919 } | |
| 1920 | |
| 1921 typedef struct { | |
| 1922 Elf32_Half code; // Actual value as defined in elf.h | |
| 1923 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 1924 char elf_class; // 32 or 64 bit | |
| 1925 char endianess; // MSB or LSB | |
| 1926 char* name; // String representation | |
| 1927 } arch_t; | |
| 1928 | |
| 1929 #ifndef EM_486 | |
| 1930 #define EM_486 6 /* Intel 80486 */ | |
| 1931 #endif | |
| 1932 | |
| 1933 static const arch_t arch_array[]={ | |
| 1934 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1935 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1936 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 1937 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 1938 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1939 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1940 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 1941 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
| 1010 | 1942 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
| 1943 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
| 1944 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 1945 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 1946 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 1947 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 1948 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 1949 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 0 | 1950 }; |
| 1951 | |
| 1952 #if (defined IA32) | |
| 1953 static Elf32_Half running_arch_code=EM_386; | |
| 1954 #elif (defined AMD64) | |
| 1955 static Elf32_Half running_arch_code=EM_X86_64; | |
| 1956 #elif (defined IA64) | |
| 1957 static Elf32_Half running_arch_code=EM_IA_64; | |
| 1958 #elif (defined __sparc) && (defined _LP64) | |
| 1959 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 1960 #elif (defined __sparc) && (!defined _LP64) | |
| 1961 static Elf32_Half running_arch_code=EM_SPARC; | |
| 1962 #elif (defined __powerpc64__) | |
| 1963 static Elf32_Half running_arch_code=EM_PPC64; | |
| 1964 #elif (defined __powerpc__) | |
| 1965 static Elf32_Half running_arch_code=EM_PPC; | |
| 1010 | 1966 #elif (defined ARM) |
| 1967 static Elf32_Half running_arch_code=EM_ARM; | |
| 1968 #elif (defined S390) | |
| 1969 static Elf32_Half running_arch_code=EM_S390; | |
| 1970 #elif (defined ALPHA) | |
| 1971 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 1972 #elif (defined MIPSEL) | |
| 1973 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 1974 #elif (defined PARISC) | |
| 1975 static Elf32_Half running_arch_code=EM_PARISC; | |
| 1976 #elif (defined MIPS) | |
| 1977 static Elf32_Half running_arch_code=EM_MIPS; | |
| 1978 #elif (defined M68K) | |
| 1979 static Elf32_Half running_arch_code=EM_68K; | |
| 0 | 1980 #else |
| 1981 #error Method os::dll_load requires that one of following is defined:\ | |
| 1010 | 1982 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
| 0 | 1983 #endif |
| 1984 | |
| 1985 // Identify compatability class for VM's architecture and library's architecture | |
| 1986 // Obtain string descriptions for architectures | |
| 1987 | |
| 1988 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 1989 int running_arch_index=-1; | |
| 1990 | |
| 1991 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 1992 if (running_arch_code == arch_array[i].code) { | |
| 1993 running_arch_index = i; | |
| 1994 } | |
| 1995 if (lib_arch.code == arch_array[i].code) { | |
| 1996 lib_arch.compat_class = arch_array[i].compat_class; | |
| 1997 lib_arch.name = arch_array[i].name; | |
| 1998 } | |
| 1999 } | |
| 2000 | |
| 2001 assert(running_arch_index != -1, | |
| 2002 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 2003 if (running_arch_index == -1) { | |
| 2004 // Even though running architecture detection failed | |
| 2005 // we may still continue with reporting dlerror() message | |
| 2006 return NULL; | |
| 2007 } | |
| 2008 | |
| 2009 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 2010 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 2011 return NULL; | |
| 2012 } | |
| 2013 | |
| 1010 | 2014 #ifndef S390 |
| 0 | 2015 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
| 2016 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 2017 return NULL; | |
| 2018 } | |
| 1010 | 2019 #endif // !S390 |
| 0 | 2020 |
| 2021 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 2022 if ( lib_arch.name!=NULL ) { | |
| 2023 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 2024 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 2025 lib_arch.name, arch_array[running_arch_index].name); | |
| 2026 } else { | |
| 2027 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 2028 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 2029 lib_arch.code, | |
| 2030 arch_array[running_arch_index].name); | |
| 2031 } | |
| 2032 } | |
| 2033 | |
| 2034 return NULL; | |
| 2035 } | |
| 2036 | |
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2037 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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2038 void * result = ::dlopen(filename, RTLD_LAZY); |
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2039 if (result == NULL) { |
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2040 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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2041 ebuf[ebuflen-1] = '\0'; |
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2042 } |
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2043 return result; |
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2044 } |
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2045 |
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2046 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
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2047 void * result = NULL; |
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2048 if (LoadExecStackDllInVMThread) { |
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2049 result = dlopen_helper(filename, ebuf, ebuflen); |
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2050 } |
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2051 |
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2052 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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2053 // library that requires an executable stack, or which does not have this |
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2054 // stack attribute set, dlopen changes the stack attribute to executable. The |
|
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2055 // read protection of the guard pages gets lost. |
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2056 // |
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2057 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
|
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7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2058 // may have been queued at the same time. |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2059 |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
diff
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|
2060 if (!_stack_is_executable) { |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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parents:
8675
diff
changeset
|
2061 JavaThread *jt = Threads::first(); |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
iklam
parents:
8675
diff
changeset
|
2062 |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
iklam
parents:
8675
diff
changeset
|
2063 while (jt) { |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
iklam
parents:
8675
diff
changeset
|
2064 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
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|
2065 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
diff
changeset
|
2066 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
diff
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|
2067 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
diff
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|
2068 warning("Attempt to reguard stack yellow zone failed."); |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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parents:
8675
diff
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|
2069 } |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
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|
2070 } |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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parents:
8675
diff
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|
2071 jt = jt->next(); |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
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|
2072 } |
|
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8675
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|
2073 } |
|
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2074 |
|
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7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2075 return result; |
|
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|
2076 } |
|
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|
2077 |
| 242 | 2078 /* |
| 2079 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
| 2080 * chances are you might want to run the generated bits against glibc-2.0 | |
| 2081 * libdl.so, so always use locking for any version of glibc. | |
| 2082 */ | |
| 2083 void* os::dll_lookup(void* handle, const char* name) { | |
| 2084 pthread_mutex_lock(&dl_mutex); | |
| 2085 void* res = dlsym(handle, name); | |
| 2086 pthread_mutex_unlock(&dl_mutex); | |
| 2087 return res; | |
| 2088 } | |
| 0 | 2089 |
| 2090 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2091 static bool _print_ascii_file(const char* filename, outputStream* st) { |
|
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
2092 int fd = ::open(filename, O_RDONLY); |
| 0 | 2093 if (fd == -1) { |
| 2094 return false; | |
| 2095 } | |
| 2096 | |
| 2097 char buf[32]; | |
| 2098 int bytes; | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
2099 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
| 0 | 2100 st->print_raw(buf, bytes); |
| 2101 } | |
| 2102 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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changeset
|
2103 ::close(fd); |
| 0 | 2104 |
| 2105 return true; | |
| 2106 } | |
| 2107 | |
| 2108 void os::print_dll_info(outputStream *st) { | |
| 2109 st->print_cr("Dynamic libraries:"); | |
| 2110 | |
| 2111 char fname[32]; | |
| 2112 pid_t pid = os::Linux::gettid(); | |
| 2113 | |
| 2114 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
| 2115 | |
| 2116 if (!_print_ascii_file(fname, st)) { | |
| 2117 st->print("Can not get library information for pid = %d\n", pid); | |
| 2118 } | |
| 2119 } | |
| 2120 | |
|
6080
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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|
2121 void os::print_os_info_brief(outputStream* st) { |
|
7432b9db36ff
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|
2122 os::Linux::print_distro_info(st); |
|
7432b9db36ff
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|
2123 |
|
7432b9db36ff
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|
2124 os::Posix::print_uname_info(st); |
|
7432b9db36ff
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|
2125 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5937
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|
2126 os::Linux::print_libversion_info(st); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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diff
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|
2127 |
|
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|
2128 } |
| 0 | 2129 |
| 2130 void os::print_os_info(outputStream* st) { | |
| 2131 st->print("OS:"); | |
| 2132 | |
|
6080
7432b9db36ff
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|
2133 os::Linux::print_distro_info(st); |
|
7432b9db36ff
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|
2134 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5937
diff
changeset
|
2135 os::Posix::print_uname_info(st); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
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diff
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|
2136 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
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|
2137 // Print warning if unsafe chroot environment detected |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5937
diff
changeset
|
2138 if (unsafe_chroot_detected) { |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2139 st->print("WARNING!! "); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2140 st->print_cr(unstable_chroot_error); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2141 } |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2142 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
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5937
diff
changeset
|
2143 os::Linux::print_libversion_info(st); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5937
diff
changeset
|
2144 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2145 os::Posix::print_rlimit_info(st); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2146 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2147 os::Posix::print_load_average(st); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2148 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2149 os::Linux::print_full_memory_info(st); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2150 } |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2151 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2152 // Try to identify popular distros. |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2153 // Most Linux distributions have /etc/XXX-release file, which contains |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2154 // the OS version string. Some have more than one /etc/XXX-release file |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2155 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2156 // so the order is important. |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2157 void os::Linux::print_distro_info(outputStream* st) { |
| 0 | 2158 if (!_print_ascii_file("/etc/mandrake-release", st) && |
| 2159 !_print_ascii_file("/etc/sun-release", st) && | |
| 2160 !_print_ascii_file("/etc/redhat-release", st) && | |
| 2161 !_print_ascii_file("/etc/SuSE-release", st) && | |
| 2162 !_print_ascii_file("/etc/turbolinux-release", st) && | |
| 2163 !_print_ascii_file("/etc/gentoo-release", st) && | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2164 !_print_ascii_file("/etc/debian_version", st) && |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2165 !_print_ascii_file("/etc/ltib-release", st) && |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2166 !_print_ascii_file("/etc/angstrom-version", st)) { |
| 0 | 2167 st->print("Linux"); |
| 2168 } | |
| 2169 st->cr(); | |
|
6080
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2170 } |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2171 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2172 void os::Linux::print_libversion_info(outputStream* st) { |
| 0 | 2173 // libc, pthread |
| 2174 st->print("libc:"); | |
| 2175 st->print(os::Linux::glibc_version()); st->print(" "); | |
| 2176 st->print(os::Linux::libpthread_version()); st->print(" "); | |
| 2177 if (os::Linux::is_LinuxThreads()) { | |
| 2178 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
| 2179 } | |
| 2180 st->cr(); | |
|
6080
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2181 } |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2182 |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2183 void os::Linux::print_full_memory_info(outputStream* st) { |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2184 st->print("\n/proc/meminfo:\n"); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2185 _print_ascii_file("/proc/meminfo", st); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2186 st->cr(); |
|
3800
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
parents:
3358
diff
changeset
|
2187 } |
|
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
parents:
3358
diff
changeset
|
2188 |
| 0 | 2189 void os::print_memory_info(outputStream* st) { |
| 2190 | |
| 2191 st->print("Memory:"); | |
| 2192 st->print(" %dk page", os::vm_page_size()>>10); | |
| 2193 | |
| 2194 // values in struct sysinfo are "unsigned long" | |
| 2195 struct sysinfo si; | |
| 2196 sysinfo(&si); | |
| 2197 | |
| 2198 st->print(", physical " UINT64_FORMAT "k", | |
| 2199 os::physical_memory() >> 10); | |
| 2200 st->print("(" UINT64_FORMAT "k free)", | |
| 2201 os::available_memory() >> 10); | |
| 2202 st->print(", swap " UINT64_FORMAT "k", | |
| 2203 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
| 2204 st->print("(" UINT64_FORMAT "k free)", | |
| 2205 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
| 2206 st->cr(); | |
| 2207 } | |
| 2208 | |
|
6080
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2209 void os::pd_print_cpu_info(outputStream* st) { |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2210 st->print("\n/proc/cpuinfo:\n"); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2211 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2212 st->print(" <Not Available>"); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2213 } |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2214 st->cr(); |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2215 } |
|
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
changeset
|
2216 |
| 0 | 2217 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific |
| 2218 // but they're the same for all the linux arch that we support | |
| 2219 // and they're the same for solaris but there's no common place to put this. | |
| 2220 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
| 2221 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
| 2222 "ILL_COPROC", "ILL_BADSTK" }; | |
| 2223 | |
| 2224 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
| 2225 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
| 2226 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
| 2227 | |
| 2228 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
| 2229 | |
| 2230 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
| 2231 | |
| 2232 void os::print_siginfo(outputStream* st, void* siginfo) { | |
| 2233 st->print("siginfo:"); | |
| 2234 | |
| 2235 const int buflen = 100; | |
| 2236 char buf[buflen]; | |
| 2237 siginfo_t *si = (siginfo_t*)siginfo; | |
| 2238 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
| 2239 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
| 2240 st->print("si_errno=%s", buf); | |
| 2241 } else { | |
| 2242 st->print("si_errno=%d", si->si_errno); | |
| 2243 } | |
| 2244 const int c = si->si_code; | |
| 2245 assert(c > 0, "unexpected si_code"); | |
| 2246 switch (si->si_signo) { | |
| 2247 case SIGILL: | |
| 2248 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
| 2249 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2250 break; | |
| 2251 case SIGFPE: | |
| 2252 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
| 2253 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2254 break; | |
| 2255 case SIGSEGV: | |
| 2256 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
| 2257 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2258 break; | |
| 2259 case SIGBUS: | |
| 2260 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
| 2261 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2262 break; | |
| 2263 default: | |
| 2264 st->print(", si_code=%d", si->si_code); | |
| 2265 // no si_addr | |
| 2266 } | |
| 2267 | |
| 2268 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
| 2269 UseSharedSpaces) { | |
| 2270 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 2271 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 2272 st->print("\n\nError accessing class data sharing archive." \ | |
| 2273 " Mapped file inaccessible during execution, " \ | |
| 2274 " possible disk/network problem."); | |
| 2275 } | |
| 2276 } | |
| 2277 st->cr(); | |
| 2278 } | |
| 2279 | |
| 2280 | |
| 2281 static void print_signal_handler(outputStream* st, int sig, | |
| 2282 char* buf, size_t buflen); | |
| 2283 | |
| 2284 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 2285 st->print_cr("Signal Handlers:"); | |
| 2286 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 2287 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 2288 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 2289 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 2290 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 2291 print_signal_handler(st, SIGILL , buf, buflen); | |
| 2292 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 2293 print_signal_handler(st, SR_signum, buf, buflen); | |
| 2294 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 2295 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 2296 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 2297 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
| 2298 } | |
| 2299 | |
| 2300 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 2301 | |
|
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
2302 // Find the full path to the current module, libjvm.so |
| 1642 | 2303 void os::jvm_path(char *buf, jint buflen) { |
| 0 | 2304 // Error checking. |
| 1642 | 2305 if (buflen < MAXPATHLEN) { |
| 0 | 2306 assert(false, "must use a large-enough buffer"); |
| 2307 buf[0] = '\0'; | |
| 2308 return; | |
| 2309 } | |
| 2310 // Lazy resolve the path to current module. | |
| 2311 if (saved_jvm_path[0] != 0) { | |
| 2312 strcpy(buf, saved_jvm_path); | |
| 2313 return; | |
| 2314 } | |
| 2315 | |
| 2316 char dli_fname[MAXPATHLEN]; | |
| 2317 bool ret = dll_address_to_library_name( | |
| 2318 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 2319 dli_fname, sizeof(dli_fname), NULL); | |
| 2320 assert(ret != 0, "cannot locate libjvm"); | |
|
1681
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diff
changeset
|
2321 char *rp = realpath(dli_fname, buf); |
|
126ea7725993
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bobv
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diff
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|
2322 if (rp == NULL) |
|
513
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xlu
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diff
changeset
|
2323 return; |
| 0 | 2324 |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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2204
diff
changeset
|
2325 if (Arguments::created_by_gamma_launcher()) { |
| 0 | 2326 // Support for the gamma launcher. Typical value for buf is |
| 2327 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
| 2328 // the right place in the string, then assume we are installed in a JDK and | |
| 2329 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
| 2330 // up the path so it looks like libjvm.so is installed there (append a | |
| 2331 // fake suffix hotspot/libjvm.so). | |
| 2332 const char *p = buf + strlen(buf) - 1; | |
| 2333 for (int count = 0; p > buf && count < 5; ++count) { | |
| 2334 for (--p; p > buf && *p != '/'; --p) | |
| 2335 /* empty */ ; | |
| 2336 } | |
| 2337 | |
| 2338 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 2339 // Look for JAVA_HOME in the environment. | |
| 2340 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 2341 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 1642 | 2342 char* jrelib_p; |
| 2343 int len; | |
| 2344 | |
|
7456
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8005044: remove crufty '_g' support from HS runtime code
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7206
diff
changeset
|
2345 // Check the current module name "libjvm.so". |
| 0 | 2346 p = strrchr(buf, '/'); |
| 2347 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 2348 | |
|
1681
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6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
2349 rp = realpath(java_home_var, buf); |
|
126ea7725993
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bobv
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diff
changeset
|
2350 if (rp == NULL) |
|
513
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477
diff
changeset
|
2351 return; |
| 1642 | 2352 |
| 2353 // determine if this is a legacy image or modules image | |
| 2354 // modules image doesn't have "jre" subdirectory | |
| 2355 len = strlen(buf); | |
| 2356 jrelib_p = buf + len; | |
| 2357 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
| 2358 if (0 != access(buf, F_OK)) { | |
| 2359 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
| 2360 } | |
| 2361 | |
| 0 | 2362 if (0 == access(buf, F_OK)) { |
|
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
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7206
diff
changeset
|
2363 // Use current module name "libjvm.so" |
| 1642 | 2364 len = strlen(buf); |
|
7456
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parents:
7206
diff
changeset
|
2365 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
| 0 | 2366 } else { |
| 2367 // Go back to path of .so | |
|
1681
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bobv
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diff
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|
2368 rp = realpath(dli_fname, buf); |
|
126ea7725993
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bobv
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1642
diff
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|
2369 if (rp == NULL) |
|
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diff
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|
2370 return; |
| 0 | 2371 } |
| 2372 } | |
| 2373 } | |
| 2374 } | |
| 2375 | |
| 2376 strcpy(saved_jvm_path, buf); | |
| 2377 } | |
| 2378 | |
| 2379 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 2380 // no prefix required, not even "_" | |
| 2381 } | |
| 2382 | |
| 2383 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 2384 // no suffix required | |
| 2385 } | |
| 2386 | |
| 2387 //////////////////////////////////////////////////////////////////////////////// | |
| 2388 // sun.misc.Signal support | |
| 2389 | |
| 2390 static volatile jint sigint_count = 0; | |
| 2391 | |
| 2392 static void | |
| 2393 UserHandler(int sig, void *siginfo, void *context) { | |
| 2394 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 2395 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 2396 // don't want to flood the manager thread with sem_post requests. | |
| 2397 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 2398 return; | |
| 2399 | |
| 2400 // Ctrl-C is pressed during error reporting, likely because the error | |
| 2401 // handler fails to abort. Let VM die immediately. | |
| 2402 if (sig == SIGINT && is_error_reported()) { | |
| 2403 os::die(); | |
| 2404 } | |
| 2405 | |
| 2406 os::signal_notify(sig); | |
| 2407 } | |
| 2408 | |
| 2409 void* os::user_handler() { | |
| 2410 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 2411 } | |
| 2412 | |
| 10405 | 2413 class Semaphore : public StackObj { |
| 2414 public: | |
| 2415 Semaphore(); | |
| 2416 ~Semaphore(); | |
| 2417 void signal(); | |
| 2418 void wait(); | |
| 2419 bool trywait(); | |
| 2420 bool timedwait(unsigned int sec, int nsec); | |
| 2421 private: | |
| 2422 sem_t _semaphore; | |
| 2423 }; | |
| 2424 | |
| 2425 | |
| 2426 Semaphore::Semaphore() { | |
| 2427 sem_init(&_semaphore, 0, 0); | |
| 2428 } | |
| 2429 | |
| 2430 Semaphore::~Semaphore() { | |
| 2431 sem_destroy(&_semaphore); | |
| 2432 } | |
| 2433 | |
| 2434 void Semaphore::signal() { | |
| 2435 sem_post(&_semaphore); | |
| 2436 } | |
| 2437 | |
| 2438 void Semaphore::wait() { | |
| 2439 sem_wait(&_semaphore); | |
| 2440 } | |
| 2441 | |
| 2442 bool Semaphore::trywait() { | |
| 2443 return sem_trywait(&_semaphore) == 0; | |
| 2444 } | |
| 2445 | |
| 2446 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 2447 struct timespec ts; | |
| 2448 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); | |
| 2449 | |
| 2450 while (1) { | |
| 2451 int result = sem_timedwait(&_semaphore, &ts); | |
| 2452 if (result == 0) { | |
| 2453 return true; | |
| 2454 } else if (errno == EINTR) { | |
| 2455 continue; | |
| 2456 } else if (errno == ETIMEDOUT) { | |
| 2457 return false; | |
| 2458 } else { | |
| 2459 return false; | |
| 2460 } | |
| 2461 } | |
| 2462 } | |
| 2463 | |
| 0 | 2464 extern "C" { |
| 2465 typedef void (*sa_handler_t)(int); | |
| 2466 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 2467 } | |
| 2468 | |
| 2469 void* os::signal(int signal_number, void* handler) { | |
| 2470 struct sigaction sigAct, oldSigAct; | |
| 2471 | |
| 2472 sigfillset(&(sigAct.sa_mask)); | |
| 2473 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2474 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 2475 | |
| 2476 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 2477 // -1 means registration failed | |
| 2478 return (void *)-1; | |
| 2479 } | |
| 2480 | |
| 2481 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 2482 } | |
| 2483 | |
| 2484 void os::signal_raise(int signal_number) { | |
| 2485 ::raise(signal_number); | |
| 2486 } | |
| 2487 | |
| 2488 /* | |
| 2489 * The following code is moved from os.cpp for making this | |
| 2490 * code platform specific, which it is by its very nature. | |
| 2491 */ | |
| 2492 | |
| 2493 // Will be modified when max signal is changed to be dynamic | |
| 2494 int os::sigexitnum_pd() { | |
| 2495 return NSIG; | |
| 2496 } | |
| 2497 | |
| 2498 // a counter for each possible signal value | |
| 2499 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 2500 | |
| 2501 // Linux(POSIX) specific hand shaking semaphore. | |
| 2502 static sem_t sig_sem; | |
| 10405 | 2503 static Semaphore sr_semaphore; |
| 0 | 2504 |
| 2505 void os::signal_init_pd() { | |
| 2506 // Initialize signal structures | |
| 2507 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 2508 | |
| 2509 // Initialize signal semaphore | |
| 2510 ::sem_init(&sig_sem, 0, 0); | |
| 2511 } | |
| 2512 | |
| 2513 void os::signal_notify(int sig) { | |
| 2514 Atomic::inc(&pending_signals[sig]); | |
| 2515 ::sem_post(&sig_sem); | |
| 2516 } | |
| 2517 | |
| 2518 static int check_pending_signals(bool wait) { | |
| 2519 Atomic::store(0, &sigint_count); | |
| 2520 for (;;) { | |
| 2521 for (int i = 0; i < NSIG + 1; i++) { | |
| 2522 jint n = pending_signals[i]; | |
| 2523 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 2524 return i; | |
| 2525 } | |
| 2526 } | |
| 2527 if (!wait) { | |
| 2528 return -1; | |
| 2529 } | |
| 2530 JavaThread *thread = JavaThread::current(); | |
| 2531 ThreadBlockInVM tbivm(thread); | |
| 2532 | |
| 2533 bool threadIsSuspended; | |
| 2534 do { | |
| 2535 thread->set_suspend_equivalent(); | |
| 2536 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 2537 ::sem_wait(&sig_sem); | |
| 2538 | |
| 2539 // were we externally suspended while we were waiting? | |
| 2540 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 2541 if (threadIsSuspended) { | |
| 2542 // | |
| 2543 // The semaphore has been incremented, but while we were waiting | |
| 2544 // another thread suspended us. We don't want to continue running | |
| 2545 // while suspended because that would surprise the thread that | |
| 2546 // suspended us. | |
| 2547 // | |
| 2548 ::sem_post(&sig_sem); | |
| 2549 | |
| 2550 thread->java_suspend_self(); | |
| 2551 } | |
| 2552 } while (threadIsSuspended); | |
| 2553 } | |
| 2554 } | |
| 2555 | |
| 2556 int os::signal_lookup() { | |
| 2557 return check_pending_signals(false); | |
| 2558 } | |
| 2559 | |
| 2560 int os::signal_wait() { | |
| 2561 return check_pending_signals(true); | |
| 2562 } | |
| 2563 | |
| 2564 //////////////////////////////////////////////////////////////////////////////// | |
| 2565 // Virtual Memory | |
| 2566 | |
| 2567 int os::vm_page_size() { | |
| 2568 // Seems redundant as all get out | |
| 2569 assert(os::Linux::page_size() != -1, "must call os::init"); | |
| 2570 return os::Linux::page_size(); | |
| 2571 } | |
| 2572 | |
| 2573 // Solaris allocates memory by pages. | |
| 2574 int os::vm_allocation_granularity() { | |
| 2575 assert(os::Linux::page_size() != -1, "must call os::init"); | |
| 2576 return os::Linux::page_size(); | |
| 2577 } | |
| 2578 | |
| 2579 // Rationale behind this function: | |
| 2580 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 2581 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 2582 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 2583 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 2584 // info for the reporting script by storing timestamp and location of symbol | |
| 2585 void linux_wrap_code(char* base, size_t size) { | |
| 2586 static volatile jint cnt = 0; | |
| 2587 | |
| 2588 if (!UseOprofile) { | |
| 2589 return; | |
| 2590 } | |
| 2591 | |
|
1497
96d554193f72
6944822: Fix for 6938627 exposes problem with hard-coded buffer sizes
coleenp
parents:
1353
diff
changeset
|
2592 char buf[PATH_MAX+1]; |
| 0 | 2593 int num = Atomic::add(1, &cnt); |
| 2594 | |
|
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
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1325
diff
changeset
|
2595 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
|
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
1325
diff
changeset
|
2596 os::get_temp_directory(), os::current_process_id(), num); |
| 0 | 2597 unlink(buf); |
| 2598 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2599 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
| 0 | 2600 |
| 2601 if (fd != -1) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2602 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
| 0 | 2603 if (rv != (off_t)-1) { |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2604 if (::write(fd, "", 1) == 1) { |
| 0 | 2605 mmap(base, size, |
| 2606 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 2607 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 2608 } | |
| 2609 } | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
2610 ::close(fd); |
| 0 | 2611 unlink(buf); |
| 2612 } | |
| 2613 } | |
| 2614 | |
| 2615 // NOTE: Linux kernel does not really reserve the pages for us. | |
| 2616 // All it does is to check if there are enough free pages | |
| 2617 // left at the time of mmap(). This could be a potential | |
| 2618 // problem. | |
| 6197 | 2619 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| 656 | 2620 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 2621 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 0 | 2622 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
| 3885 | 2623 if (res != (uintptr_t) MAP_FAILED) { |
| 2624 if (UseNUMAInterleaving) { | |
| 2625 numa_make_global(addr, size); | |
| 2626 } | |
| 2627 return true; | |
| 2628 } | |
| 2629 return false; | |
| 0 | 2630 } |
| 2631 | |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2632 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2633 #ifndef MAP_HUGETLB |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2634 #define MAP_HUGETLB 0x40000 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2635 #endif |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
changeset
|
2636 |
|
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2637 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2638 #ifndef MADV_HUGEPAGE |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2639 #define MADV_HUGEPAGE 14 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2640 #endif |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2641 |
| 6197 | 2642 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| 656 | 2643 bool exec) { |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
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2302
diff
changeset
|
2644 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2645 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2646 uintptr_t res = |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2647 (uintptr_t) ::mmap(addr, size, prot, |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2648 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2649 -1, 0); |
| 3885 | 2650 if (res != (uintptr_t) MAP_FAILED) { |
| 2651 if (UseNUMAInterleaving) { | |
| 2652 numa_make_global(addr, size); | |
| 2653 } | |
| 2654 return true; | |
| 2655 } | |
|
3913
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2656 // Fall through and try to use small pages |
|
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2657 } |
|
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2658 |
|
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2659 if (commit_memory(addr, size, exec)) { |
|
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2660 realign_memory(addr, size, alignment_hint); |
|
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
parents:
3887
diff
changeset
|
2661 return true; |
|
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2662 } |
|
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2663 return false; |
| 0 | 2664 } |
| 2665 | |
| 6197 | 2666 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2667 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2668 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2669 // be supported or the memory may already be backed by huge pages. |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2670 ::madvise(addr, bytes, MADV_HUGEPAGE); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2671 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2672 } |
| 141 | 2673 |
| 6197 | 2674 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
|
5937
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2675 // This method works by doing an mmap over an existing mmaping and effectively discarding |
|
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2676 // the existing pages. However it won't work for SHM-based large pages that cannot be |
|
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2677 // uncommitted at all. We don't do anything in this case to avoid creating a segment with |
|
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2678 // small pages on top of the SHM segment. This method always works for small pages, so we |
|
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2679 // allow that in any case. |
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|
2680 if (alignment_hint <= (size_t)os::vm_page_size() || !UseSHM) { |
|
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|
2681 commit_memory(addr, bytes, alignment_hint, false); |
|
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|
2682 } |
| 141 | 2683 } |
| 2684 | |
|
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|
2685 void os::numa_make_global(char *addr, size_t bytes) { |
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2686 Linux::numa_interleave_memory(addr, bytes); |
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|
2687 } |
| 141 | 2688 |
| 2689 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
| 2690 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); | |
| 2691 } | |
| 2692 | |
| 2693 bool os::numa_topology_changed() { return false; } | |
| 2694 | |
| 2695 size_t os::numa_get_groups_num() { | |
| 2696 int max_node = Linux::numa_max_node(); | |
| 2697 return max_node > 0 ? max_node + 1 : 1; | |
| 2698 } | |
| 2699 | |
| 2700 int os::numa_get_group_id() { | |
| 2701 int cpu_id = Linux::sched_getcpu(); | |
| 2702 if (cpu_id != -1) { | |
| 2703 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
| 2704 if (lgrp_id != -1) { | |
| 2705 return lgrp_id; | |
| 2706 } | |
| 0 | 2707 } |
| 2708 return 0; | |
| 2709 } | |
| 2710 | |
| 141 | 2711 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
| 2712 for (size_t i = 0; i < size; i++) { | |
| 2713 ids[i] = i; | |
| 2714 } | |
| 2715 return size; | |
| 2716 } | |
| 2717 | |
| 0 | 2718 bool os::get_page_info(char *start, page_info* info) { |
| 2719 return false; | |
| 2720 } | |
| 2721 | |
| 2722 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2723 return end; | |
| 2724 } | |
| 2725 | |
| 3826 | 2726 |
| 2727 int os::Linux::sched_getcpu_syscall(void) { | |
| 2728 unsigned int cpu; | |
| 2729 int retval = -1; | |
| 2730 | |
| 2731 #if defined(IA32) | |
|
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2732 # ifndef SYS_getcpu |
|
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2733 # define SYS_getcpu 318 |
|
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|
2734 # endif |
| 3826 | 2735 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
| 2736 #elif defined(AMD64) | |
|
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|
2737 // Unfortunately we have to bring all these macros here from vsyscall.h |
|
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2738 // to be able to compile on old linuxes. |
|
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|
2739 # define __NR_vgetcpu 2 |
|
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|
2740 # define VSYSCALL_START (-10UL << 20) |
|
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2741 # define VSYSCALL_SIZE 1024 |
|
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2742 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
| 3826 | 2743 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
| 2744 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
| 2745 retval = vgetcpu(&cpu, NULL, NULL); | |
| 2746 #endif | |
| 2747 | |
| 2748 return (retval == -1) ? retval : cpu; | |
| 2749 } | |
| 2750 | |
| 2191 | 2751 // Something to do with the numa-aware allocator needs these symbols |
| 2752 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
| 2753 extern "C" JNIEXPORT void numa_error(char *where) { } | |
| 2754 extern "C" JNIEXPORT int fork1() { return fork(); } | |
| 141 | 2755 |
|
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|
2756 |
|
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|
2757 // If we are running with libnuma version > 2, then we should |
|
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2758 // be trying to use symbols with versions 1.1 |
|
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|
2759 // If we are running with earlier version, which did not have symbol versions, |
|
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|
2760 // we should use the base version. |
|
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|
2761 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
|
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|
2762 void *f = dlvsym(handle, name, "libnuma_1.1"); |
|
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2763 if (f == NULL) { |
|
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|
2764 f = dlsym(handle, name); |
|
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|
2765 } |
|
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|
2766 return f; |
|
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|
2767 } |
|
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|
2768 |
|
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|
2769 bool os::Linux::libnuma_init() { |
| 141 | 2770 // sched_getcpu() should be in libc. |
| 2771 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
| 2772 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
| 2773 | |
| 3826 | 2774 // If it's not, try a direct syscall. |
| 2775 if (sched_getcpu() == -1) | |
| 2776 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
| 2777 | |
| 141 | 2778 if (sched_getcpu() != -1) { // Does it work? |
|
267
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|
2779 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
| 141 | 2780 if (handle != NULL) { |
| 2781 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
|
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|
2782 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
| 141 | 2783 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
|
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|
2784 libnuma_dlsym(handle, "numa_max_node"))); |
| 141 | 2785 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
|
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|
2786 libnuma_dlsym(handle, "numa_available"))); |
| 141 | 2787 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
|
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|
2788 libnuma_dlsym(handle, "numa_tonode_memory"))); |
|
462
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|
2789 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
|
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|
2790 libnuma_dlsym(handle, "numa_interleave_memory"))); |
|
462
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|
2791 |
|
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|
2792 |
| 141 | 2793 if (numa_available() != -1) { |
|
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|
2794 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
| 141 | 2795 // Create a cpu -> node mapping |
| 6197 | 2796 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
| 141 | 2797 rebuild_cpu_to_node_map(); |
|
462
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|
2798 return true; |
| 141 | 2799 } |
| 2800 } | |
| 2801 } | |
|
462
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|
2802 return false; |
| 141 | 2803 } |
| 2804 | |
| 2805 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
| 2806 // The table is later used in get_node_by_cpu(). | |
| 2807 void os::Linux::rebuild_cpu_to_node_map() { | |
|
462
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|
2808 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
|
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|
2809 // in libnuma (possible values are starting from 16, |
|
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|
2810 // and continuing up with every other power of 2, but less |
|
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|
2811 // than the maximum number of CPUs supported by kernel), and |
|
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|
2812 // is a subject to change (in libnuma version 2 the requirements |
|
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|
2813 // are more reasonable) we'll just hardcode the number they use |
|
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|
2814 // in the library. |
|
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|
2815 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
|
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|
2816 |
|
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|
2817 size_t cpu_num = os::active_processor_count(); |
|
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|
2818 size_t cpu_map_size = NCPUS / BitsPerCLong; |
|
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|
2819 size_t cpu_map_valid_size = |
|
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|
2820 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
|
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|
2821 |
| 141 | 2822 cpu_to_node()->clear(); |
| 2823 cpu_to_node()->at_grow(cpu_num - 1); | |
|
462
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|
2824 size_t node_num = numa_get_groups_num(); |
|
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|
2825 |
| 6197 | 2826 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
|
462
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|
2827 for (size_t i = 0; i < node_num; i++) { |
| 141 | 2828 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
|
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|
2829 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
| 141 | 2830 if (cpu_map[j] != 0) { |
|
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|
2831 for (size_t k = 0; k < BitsPerCLong; k++) { |
| 141 | 2832 if (cpu_map[j] & (1UL << k)) { |
|
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|
2833 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
| 141 | 2834 } |
| 2835 } | |
| 2836 } | |
| 2837 } | |
| 2838 } | |
| 2839 } | |
| 6197 | 2840 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
| 141 | 2841 } |
| 2842 | |
| 2843 int os::Linux::get_node_by_cpu(int cpu_id) { | |
| 2844 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
| 2845 return cpu_to_node()->at(cpu_id); | |
| 2846 } | |
| 2847 return -1; | |
| 2848 } | |
| 2849 | |
| 2850 GrowableArray<int>* os::Linux::_cpu_to_node; | |
| 2851 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
| 2852 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
| 2853 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
| 2854 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
| 2855 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
|
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|
2856 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
|
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|
2857 unsigned long* os::Linux::_numa_all_nodes; |
| 141 | 2858 |
| 6197 | 2859 bool os::pd_uncommit_memory(char* addr, size_t size) { |
|
1681
126ea7725993
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|
2860 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
|
126ea7725993
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|
2861 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
|
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|
2862 return res != (uintptr_t) MAP_FAILED; |
| 0 | 2863 } |
| 2864 | |
|
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|
2865 // Linux uses a growable mapping for the stack, and if the mapping for |
|
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|
2866 // the stack guard pages is not removed when we detach a thread the |
|
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1123
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|
2867 // stack cannot grow beyond the pages where the stack guard was |
|
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1123
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|
2868 // mapped. If at some point later in the process the stack expands to |
|
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|
2869 // that point, the Linux kernel cannot expand the stack any further |
|
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|
2870 // because the guard pages are in the way, and a segfault occurs. |
|
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6929067: Stack guard pages should be removed when thread is detached
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|
2871 // |
|
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|
2872 // However, it's essential not to split the stack region by unmapping |
|
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6929067: Stack guard pages should be removed when thread is detached
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|
2873 // a region (leaving a hole) that's already part of the stack mapping, |
|
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|
2874 // so if the stack mapping has already grown beyond the guard pages at |
|
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6929067: Stack guard pages should be removed when thread is detached
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|
2875 // the time we create them, we have to truncate the stack mapping. |
|
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6929067: Stack guard pages should be removed when thread is detached
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|
2876 // So, we need to know the extent of the stack mapping when |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
2877 // create_stack_guard_pages() is called. |
|
3b3d12e645e7
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|
2878 |
|
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|
2879 // Find the bounds of the stack mapping. Return true for success. |
|
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|
2880 // |
|
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|
2881 // We only need this for stacks that are growable: at the time of |
|
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coleenp
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|
2882 // writing thread stacks don't use growable mappings (i.e. those |
|
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coleenp
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|
2883 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
|
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coleenp
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|
2884 // only applies to the main thread. |
|
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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diff
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|
2885 |
|
677234770800
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|
2886 static |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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|
2887 bool get_stack_bounds(uintptr_t *bottom, uintptr_t *top) { |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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|
2888 |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2889 char buf[128]; |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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|
2890 int fd, sz; |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2891 |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2892 if ((fd = ::open("/proc/self/maps", O_RDONLY)) < 0) { |
|
1320
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2893 return false; |
|
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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diff
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|
2894 } |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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|
2895 |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2896 const char kw[] = "[stack]"; |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2897 const int kwlen = sizeof(kw)-1; |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2898 |
|
677234770800
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|
2899 // Address part of /proc/self/maps couldn't be more than 128 bytes |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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|
2900 while ((sz = os::get_line_chars(fd, buf, sizeof(buf))) > 0) { |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
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|
2901 if (sz > kwlen && ::memcmp(buf+sz-kwlen, kw, kwlen) == 0) { |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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diff
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|
2902 // Extract addresses |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
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|
2903 if (sscanf(buf, "%" SCNxPTR "-%" SCNxPTR, bottom, top) == 2) { |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
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|
2904 uintptr_t sp = (uintptr_t) __builtin_frame_address(0); |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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|
2905 if (sp >= *bottom && sp <= *top) { |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2906 ::close(fd); |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2907 return true; |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2908 } |
|
1320
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|
2909 } |
|
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2910 } |
|
1320
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|
2911 } |
|
2469
677234770800
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diff
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|
2912 |
|
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2913 ::close(fd); |
|
1320
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|
2914 return false; |
|
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|
2915 } |
|
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|
2916 |
|
2469
677234770800
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|
2917 |
|
1320
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|
2918 // If the (growable) stack mapping already extends beyond the point |
|
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|
2919 // where we're going to put our guard pages, truncate the mapping at |
|
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|
2920 // that point by munmap()ping it. This ensures that when we later |
|
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|
2921 // munmap() the guard pages we don't leave a hole in the stack |
|
1750
c7004d700b49
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dholmes
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|
2922 // mapping. This only affects the main/initial thread, but guard |
|
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|
2923 // against future OS changes |
| 6197 | 2924 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
|
1320
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|
2925 uintptr_t stack_extent, stack_base; |
|
1750
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dholmes
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|
2926 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
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|
2927 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
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diff
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|
2928 assert(os::Linux::is_initial_thread(), |
|
c7004d700b49
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|
2929 "growable stack in non-initial thread"); |
|
1320
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|
2930 if (stack_extent < (uintptr_t)addr) |
|
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|
2931 ::munmap((void*)stack_extent, (uintptr_t)addr - stack_extent); |
|
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|
2932 } |
|
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|
2933 |
|
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|
2934 return os::commit_memory(addr, size); |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
2935 } |
|
3b3d12e645e7
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|
2936 |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
2937 // If this is a growable mapping, remove the guard pages entirely by |
|
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2938 // munmap()ping them. If not, just call uncommit_memory(). This only |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2939 // affects the main/initial thread, but guard against future OS changes |
|
1320
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6929067: Stack guard pages should be removed when thread is detached
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|
2940 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
2941 uintptr_t stack_extent, stack_base; |
|
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2942 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2943 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2944 assert(os::Linux::is_initial_thread(), |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
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1681
diff
changeset
|
2945 "growable stack in non-initial thread"); |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
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1681
diff
changeset
|
2946 |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
2947 return ::munmap(addr, size) == 0; |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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changeset
|
2948 } |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
2949 |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
2950 return os::uncommit_memory(addr, size); |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
2951 } |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
2952 |
| 0 | 2953 static address _highest_vm_reserved_address = NULL; |
| 2954 | |
| 2955 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 2956 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 2957 // location, however, they will be overwritten. If 'fixed' is false, | |
| 2958 // 'requested_addr' is only treated as a hint, the return value may or | |
| 2959 // may not start from the requested address. Unlike Linux mmap(), this | |
| 2960 // function returns NULL to indicate failure. | |
| 2961 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 2962 char * addr; | |
| 2963 int flags; | |
| 2964 | |
| 2965 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 2966 if (fixed) { | |
| 2967 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
| 2968 flags |= MAP_FIXED; | |
| 2969 } | |
| 2970 | |
| 10157 | 2971 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
| 2972 // touch an uncommitted page. Otherwise, the read/write might | |
| 2973 // succeed if we have enough swap space to back the physical page. | |
| 2974 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
| 0 | 2975 flags, -1, 0); |
| 2976 | |
| 2977 if (addr != MAP_FAILED) { | |
| 2978 // anon_mmap() should only get called during VM initialization, | |
| 2979 // don't need lock (actually we can skip locking even it can be called | |
| 2980 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 2981 // hint about the upper limit of non-stack memory regions.) | |
| 2982 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 2983 _highest_vm_reserved_address = (address)addr + bytes; | |
| 2984 } | |
| 2985 } | |
| 2986 | |
| 2987 return addr == MAP_FAILED ? NULL : addr; | |
| 2988 } | |
| 2989 | |
| 2990 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 2991 // regions above addr + size. If so, releasing a memory region only creates | |
| 2992 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 2993 // | |
| 2994 static int anon_munmap(char * addr, size_t size) { | |
| 2995 return ::munmap(addr, size) == 0; | |
| 2996 } | |
| 2997 | |
| 6197 | 2998 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 0 | 2999 size_t alignment_hint) { |
| 3000 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 3001 } | |
| 3002 | |
| 6197 | 3003 bool os::pd_release_memory(char* addr, size_t size) { |
| 0 | 3004 return anon_munmap(addr, size); |
| 3005 } | |
| 3006 | |
| 3007 static address highest_vm_reserved_address() { | |
| 3008 return _highest_vm_reserved_address; | |
| 3009 } | |
| 3010 | |
| 3011 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
| 3012 // Linux wants the mprotect address argument to be page aligned. | |
| 3013 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
| 3014 | |
| 3015 // According to SUSv3, mprotect() should only be used with mappings | |
| 3016 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 3017 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 3018 // protection of malloc'ed or statically allocated memory). Check the | |
| 3019 // caller if you hit this assert. | |
| 3020 assert(addr == bottom, "sanity check"); | |
| 3021 | |
| 3022 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
| 3023 return ::mprotect(bottom, size, prot) == 0; | |
| 3024 } | |
| 3025 | |
|
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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|
3026 // Set protections specified |
|
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6716785: implicit null checks not triggering with CompressedOops
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diff
changeset
|
3027 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
|
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6716785: implicit null checks not triggering with CompressedOops
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235
diff
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|
3028 bool is_committed) { |
|
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6716785: implicit null checks not triggering with CompressedOops
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235
diff
changeset
|
3029 unsigned int p = 0; |
|
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6716785: implicit null checks not triggering with CompressedOops
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235
diff
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|
3030 switch (prot) { |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
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diff
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|
3031 case MEM_PROT_NONE: p = PROT_NONE; break; |
|
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6716785: implicit null checks not triggering with CompressedOops
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diff
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|
3032 case MEM_PROT_READ: p = PROT_READ; break; |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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diff
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|
3033 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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235
diff
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|
3034 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
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diff
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|
3035 default: |
|
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6716785: implicit null checks not triggering with CompressedOops
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diff
changeset
|
3036 ShouldNotReachHere(); |
|
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diff
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|
3037 } |
|
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6716785: implicit null checks not triggering with CompressedOops
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235
diff
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|
3038 // is_committed is unused. |
|
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diff
changeset
|
3039 return linux_mprotect(addr, bytes, p); |
| 0 | 3040 } |
| 3041 | |
| 3042 bool os::guard_memory(char* addr, size_t size) { | |
| 3043 return linux_mprotect(addr, size, PROT_NONE); | |
| 3044 } | |
| 3045 | |
| 3046 bool os::unguard_memory(char* addr, size_t size) { | |
|
477
24fda36852ce
6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE
coleenp
parents:
462
diff
changeset
|
3047 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
| 0 | 3048 } |
| 3049 | |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3050 bool os::Linux::hugetlbfs_sanity_check(bool warn, size_t page_size) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3051 bool result = false; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3052 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3053 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3054 -1, 0); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3055 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3056 if (p != (void *) -1) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3057 // We don't know if this really is a huge page or not. |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3058 FILE *fp = fopen("/proc/self/maps", "r"); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3059 if (fp) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3060 while (!feof(fp)) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3061 char chars[257]; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3062 long x = 0; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3063 if (fgets(chars, sizeof(chars), fp)) { |
| 3358 | 3064 if (sscanf(chars, "%lx-%*x", &x) == 1 |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3065 && x == (long)p) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3066 if (strstr (chars, "hugepage")) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3067 result = true; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3068 break; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3069 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3070 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3071 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3072 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3073 fclose(fp); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3074 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3075 munmap (p, page_size); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3076 if (result) |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3077 return true; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3078 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3079 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3080 if (warn) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3081 warning("HugeTLBFS is not supported by the operating system."); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3082 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3083 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3084 return result; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3085 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3086 |
|
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3087 /* |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3088 * Set the coredump_filter bits to include largepages in core dump (bit 6) |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3089 * |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3090 * From the coredump_filter documentation: |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3091 * |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3092 * - (bit 0) anonymous private memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3093 * - (bit 1) anonymous shared memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3094 * - (bit 2) file-backed private memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3095 * - (bit 3) file-backed shared memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3096 * - (bit 4) ELF header pages in file-backed private memory areas (it is |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3097 * effective only if the bit 2 is cleared) |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3098 * - (bit 5) hugetlb private memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3099 * - (bit 6) hugetlb shared memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3100 */ |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3101 static void set_coredump_filter(void) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3102 FILE *f; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3103 long cdm; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3104 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3105 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3106 return; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3107 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3108 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3109 if (fscanf(f, "%lx", &cdm) != 1) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3110 fclose(f); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3111 return; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3112 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3113 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3114 rewind(f); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3115 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3116 if ((cdm & LARGEPAGES_BIT) == 0) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3117 cdm |= LARGEPAGES_BIT; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3118 fprintf(f, "%#lx", cdm); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3119 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3120 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3121 fclose(f); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3122 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3123 |
| 0 | 3124 // Large page support |
| 3125 | |
| 3126 static size_t _large_page_size = 0; | |
| 3127 | |
|
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3128 void os::large_page_init() { |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3129 if (!UseLargePages) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3130 UseHugeTLBFS = false; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3131 UseSHM = false; |
|
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3132 return; |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3133 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3134 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3135 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { |
|
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3136 // If UseLargePages is specified on the command line try both methods, |
|
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3137 // if it's default, then try only HugeTLBFS. |
|
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3138 if (FLAG_IS_DEFAULT(UseLargePages)) { |
|
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3139 UseHugeTLBFS = true; |
|
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3140 } else { |
|
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3141 UseHugeTLBFS = UseSHM = true; |
|
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3142 } |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3143 } |
| 0 | 3144 |
| 3145 if (LargePageSizeInBytes) { | |
| 3146 _large_page_size = LargePageSizeInBytes; | |
| 3147 } else { | |
| 3148 // large_page_size on Linux is used to round up heap size. x86 uses either | |
| 3149 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) | |
| 3150 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use | |
| 3151 // page as large as 256M. | |
| 3152 // | |
| 3153 // Here we try to figure out page size by parsing /proc/meminfo and looking | |
| 3154 // for a line with the following format: | |
| 3155 // Hugepagesize: 2048 kB | |
| 3156 // | |
| 3157 // If we can't determine the value (e.g. /proc is not mounted, or the text | |
| 3158 // format has been changed), we'll use the largest page size supported by | |
| 3159 // the processor. | |
| 3160 | |
| 1010 | 3161 #ifndef ZERO |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
3162 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
3163 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
| 1010 | 3164 #endif // ZERO |
| 0 | 3165 |
| 3166 FILE *fp = fopen("/proc/meminfo", "r"); | |
| 3167 if (fp) { | |
| 3168 while (!feof(fp)) { | |
| 3169 int x = 0; | |
| 3170 char buf[16]; | |
| 3171 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { | |
| 3172 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { | |
| 3173 _large_page_size = x * K; | |
| 3174 break; | |
| 3175 } | |
| 3176 } else { | |
| 3177 // skip to next line | |
| 3178 for (;;) { | |
| 3179 int ch = fgetc(fp); | |
| 3180 if (ch == EOF || ch == (int)'\n') break; | |
| 3181 } | |
| 3182 } | |
| 3183 } | |
| 3184 fclose(fp); | |
| 3185 } | |
| 3186 } | |
| 3187 | |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3188 // print a warning if any large page related flag is specified on command line |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3189 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3190 |
| 0 | 3191 const size_t default_page_size = (size_t)Linux::page_size(); |
| 3192 if (_large_page_size > default_page_size) { | |
| 3193 _page_sizes[0] = _large_page_size; | |
| 3194 _page_sizes[1] = default_page_size; | |
| 3195 _page_sizes[2] = 0; | |
| 3196 } | |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3197 UseHugeTLBFS = UseHugeTLBFS && |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3198 Linux::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3199 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3200 if (UseHugeTLBFS) |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3201 UseSHM = false; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3202 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3203 UseLargePages = UseHugeTLBFS || UseSHM; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3204 |
|
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3205 set_coredump_filter(); |
| 0 | 3206 } |
| 3207 | |
| 3208 #ifndef SHM_HUGETLB | |
| 3209 #define SHM_HUGETLB 04000 | |
| 3210 #endif | |
| 3211 | |
| 656 | 3212 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { |
| 3213 // "exec" is passed in but not used. Creating the shared image for | |
| 3214 // the code cache doesn't have an SHM_X executable permission to check. | |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3215 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
| 0 | 3216 |
| 3217 key_t key = IPC_PRIVATE; | |
| 3218 char *addr; | |
| 3219 | |
| 3220 bool warn_on_failure = UseLargePages && | |
| 3221 (!FLAG_IS_DEFAULT(UseLargePages) || | |
| 3222 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
| 3223 ); | |
| 3224 char msg[128]; | |
| 3225 | |
| 3226 // Create a large shared memory region to attach to based on size. | |
| 3227 // Currently, size is the total size of the heap | |
| 3228 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
| 3229 if (shmid == -1) { | |
| 3230 // Possible reasons for shmget failure: | |
| 3231 // 1. shmmax is too small for Java heap. | |
| 3232 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 3233 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 3234 // 2. not enough large page memory. | |
| 3235 // > check available large pages: cat /proc/meminfo | |
| 3236 // > increase amount of large pages: | |
| 3237 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 3238 // Note 1: different Linux may use different name for this property, | |
| 3239 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 3240 // Note 2: it's possible there's enough physical memory available but | |
| 3241 // they are so fragmented after a long run that they can't | |
| 3242 // coalesce into large pages. Try to reserve large pages when | |
| 3243 // the system is still "fresh". | |
| 3244 if (warn_on_failure) { | |
| 3245 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
| 3246 warning(msg); | |
| 3247 } | |
| 3248 return NULL; | |
| 3249 } | |
| 3250 | |
| 3251 // attach to the region | |
|
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|
3252 addr = (char*)shmat(shmid, req_addr, 0); |
| 0 | 3253 int err = errno; |
| 3254 | |
| 3255 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 3256 // will be deleted when it's detached by shmdt() or when the process | |
| 3257 // terminates. If shmat() is not successful this will remove the shared | |
| 3258 // segment immediately. | |
| 3259 shmctl(shmid, IPC_RMID, NULL); | |
| 3260 | |
| 3261 if ((intptr_t)addr == -1) { | |
| 3262 if (warn_on_failure) { | |
| 3263 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
| 3264 warning(msg); | |
| 3265 } | |
| 3266 return NULL; | |
| 3267 } | |
| 3268 | |
| 3885 | 3269 if ((addr != NULL) && UseNUMAInterleaving) { |
| 3270 numa_make_global(addr, bytes); | |
| 3271 } | |
| 3272 | |
|
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|
3273 // The memory is committed |
|
6b803ba47588
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|
3274 address pc = CALLER_PC; |
|
6b803ba47588
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|
3275 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); |
|
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|
3276 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); |
|
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|
3277 |
| 0 | 3278 return addr; |
| 3279 } | |
| 3280 | |
| 3281 bool os::release_memory_special(char* base, size_t bytes) { | |
| 3282 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
| 3283 int rslt = shmdt(base); | |
|
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|
3284 if (rslt == 0) { |
|
6b803ba47588
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|
3285 MemTracker::record_virtual_memory_uncommit((address)base, bytes); |
|
6b803ba47588
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|
3286 MemTracker::record_virtual_memory_release((address)base, bytes); |
|
6b803ba47588
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|
3287 return true; |
|
6b803ba47588
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|
3288 } else { |
|
6b803ba47588
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|
3289 return false; |
|
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|
3290 } |
| 0 | 3291 } |
| 3292 | |
| 3293 size_t os::large_page_size() { | |
| 3294 return _large_page_size; | |
| 3295 } | |
| 3296 | |
|
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|
3297 // HugeTLBFS allows application to commit large page memory on demand; |
|
139667d9836a
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diff
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|
3298 // with SysV SHM the entire memory region must be allocated as shared |
|
139667d9836a
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diff
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|
3299 // memory. |
| 0 | 3300 bool os::can_commit_large_page_memory() { |
|
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|
3301 return UseHugeTLBFS; |
| 0 | 3302 } |
| 3303 | |
|
79
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6642862: Code cache allocation fails with large pages after 6588638
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diff
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|
3304 bool os::can_execute_large_page_memory() { |
|
3286
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|
3305 return UseHugeTLBFS; |
|
79
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|
3306 } |
|
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|
3307 |
| 0 | 3308 // Reserve memory at an arbitrary address, only if that area is |
| 3309 // available (and not reserved for something else). | |
| 3310 | |
| 6197 | 3311 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 0 | 3312 const int max_tries = 10; |
| 3313 char* base[max_tries]; | |
| 3314 size_t size[max_tries]; | |
| 3315 const size_t gap = 0x000000; | |
| 3316 | |
| 3317 // Assert only that the size is a multiple of the page size, since | |
| 3318 // that's all that mmap requires, and since that's all we really know | |
| 3319 // about at this low abstraction level. If we need higher alignment, | |
| 3320 // we can either pass an alignment to this method or verify alignment | |
| 3321 // in one of the methods further up the call chain. See bug 5044738. | |
| 3322 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 3323 | |
| 3324 // Repeatedly allocate blocks until the block is allocated at the | |
| 3325 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 3326 // automatically update _highest_vm_reserved_address if the call is | |
| 3327 // successful. The variable tracks the highest memory address every reserved | |
| 3328 // by JVM. It is used to detect heap-stack collision if running with | |
| 3329 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
| 3330 // space than needed, it could confuse the collision detecting code. To | |
| 3331 // solve the problem, save current _highest_vm_reserved_address and | |
| 3332 // calculate the correct value before return. | |
| 3333 address old_highest = _highest_vm_reserved_address; | |
| 3334 | |
| 3335 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
| 3336 // if kernel honors the hint then we can return immediately. | |
| 3337 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 3338 if (addr == requested_addr) { | |
| 3339 return requested_addr; | |
| 3340 } | |
| 3341 | |
| 3342 if (addr != NULL) { | |
| 3343 // mmap() is successful but it fails to reserve at the requested address | |
| 3344 anon_munmap(addr, bytes); | |
| 3345 } | |
| 3346 | |
| 3347 int i; | |
| 3348 for (i = 0; i < max_tries; ++i) { | |
| 3349 base[i] = reserve_memory(bytes); | |
| 3350 | |
| 3351 if (base[i] != NULL) { | |
| 3352 // Is this the block we wanted? | |
| 3353 if (base[i] == requested_addr) { | |
| 3354 size[i] = bytes; | |
| 3355 break; | |
| 3356 } | |
| 3357 | |
| 3358 // Does this overlap the block we wanted? Give back the overlapped | |
| 3359 // parts and try again. | |
| 3360 | |
| 3361 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 3362 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 3363 unmap_memory(base[i], top_overlap); | |
| 3364 base[i] += top_overlap; | |
| 3365 size[i] = bytes - top_overlap; | |
| 3366 } else { | |
| 3367 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 3368 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 3369 unmap_memory(requested_addr, bottom_overlap); | |
| 3370 size[i] = bytes - bottom_overlap; | |
| 3371 } else { | |
| 3372 size[i] = bytes; | |
| 3373 } | |
| 3374 } | |
| 3375 } | |
| 3376 } | |
| 3377 | |
| 3378 // Give back the unused reserved pieces. | |
| 3379 | |
| 3380 for (int j = 0; j < i; ++j) { | |
| 3381 if (base[j] != NULL) { | |
| 3382 unmap_memory(base[j], size[j]); | |
| 3383 } | |
| 3384 } | |
| 3385 | |
| 3386 if (i < max_tries) { | |
| 3387 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 3388 return requested_addr; | |
| 3389 } else { | |
| 3390 _highest_vm_reserved_address = old_highest; | |
| 3391 return NULL; | |
| 3392 } | |
| 3393 } | |
| 3394 | |
| 3395 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 3396 return ::read(fd, buf, nBytes); | |
| 3397 } | |
| 3398 | |
| 3399 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
| 3400 // Solaris uses poll(), linux uses park(). | |
| 3401 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 3402 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 3403 // SIGSEGV, see 4355769. | |
| 3404 | |
| 3405 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 3406 assert(thread == Thread::current(), "thread consistency check"); | |
| 3407 | |
| 3408 ParkEvent * const slp = thread->_SleepEvent ; | |
| 3409 slp->reset() ; | |
| 3410 OrderAccess::fence() ; | |
| 3411 | |
| 3412 if (interruptible) { | |
| 3413 jlong prevtime = javaTimeNanos(); | |
| 3414 | |
| 3415 for (;;) { | |
| 3416 if (os::is_interrupted(thread, true)) { | |
| 3417 return OS_INTRPT; | |
| 3418 } | |
| 3419 | |
| 3420 jlong newtime = javaTimeNanos(); | |
| 3421 | |
| 3422 if (newtime - prevtime < 0) { | |
| 3423 // time moving backwards, should only happen if no monotonic clock | |
| 3424 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 3425 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
| 3426 } else { | |
|
4712
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johnc
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4082
diff
changeset
|
3427 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 0 | 3428 } |
| 3429 | |
| 3430 if(millis <= 0) { | |
| 3431 return OS_OK; | |
| 3432 } | |
| 3433 | |
| 3434 prevtime = newtime; | |
| 3435 | |
| 3436 { | |
| 3437 assert(thread->is_Java_thread(), "sanity check"); | |
| 3438 JavaThread *jt = (JavaThread *) thread; | |
| 3439 ThreadBlockInVM tbivm(jt); | |
| 3440 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 3441 | |
| 3442 jt->set_suspend_equivalent(); | |
| 3443 // cleared by handle_special_suspend_equivalent_condition() or | |
| 3444 // java_suspend_self() via check_and_wait_while_suspended() | |
| 3445 | |
| 3446 slp->park(millis); | |
| 3447 | |
| 3448 // were we externally suspended while we were waiting? | |
| 3449 jt->check_and_wait_while_suspended(); | |
| 3450 } | |
| 3451 } | |
| 3452 } else { | |
| 3453 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 3454 jlong prevtime = javaTimeNanos(); | |
| 3455 | |
| 3456 for (;;) { | |
| 3457 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 3458 // the 1st iteration ... | |
| 3459 jlong newtime = javaTimeNanos(); | |
| 3460 | |
| 3461 if (newtime - prevtime < 0) { | |
| 3462 // time moving backwards, should only happen if no monotonic clock | |
| 3463 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 3464 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
| 3465 } else { | |
|
4712
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4082
diff
changeset
|
3466 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 0 | 3467 } |
| 3468 | |
| 3469 if(millis <= 0) break ; | |
| 3470 | |
| 3471 prevtime = newtime; | |
| 3472 slp->park(millis); | |
| 3473 } | |
| 3474 return OS_OK ; | |
| 3475 } | |
| 3476 } | |
| 3477 | |
| 3478 int os::naked_sleep() { | |
| 3479 // %% make the sleep time an integer flag. for now use 1 millisec. | |
| 3480 return os::sleep(Thread::current(), 1, false); | |
| 3481 } | |
| 3482 | |
| 3483 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 3484 void os::infinite_sleep() { | |
| 3485 while (true) { // sleep forever ... | |
| 3486 ::sleep(100); // ... 100 seconds at a time | |
| 3487 } | |
| 3488 } | |
| 3489 | |
| 3490 // Used to convert frequent JVM_Yield() to nops | |
| 3491 bool os::dont_yield() { | |
| 3492 return DontYieldALot; | |
| 3493 } | |
| 3494 | |
| 3495 void os::yield() { | |
| 3496 sched_yield(); | |
| 3497 } | |
| 3498 | |
| 3499 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 3500 | |
| 3501 void os::yield_all(int attempts) { | |
| 3502 // Yields to all threads, including threads with lower priorities | |
| 3503 // Threads on Linux are all with same priority. The Solaris style | |
| 3504 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 3505 sched_yield(); | |
| 3506 } | |
| 3507 | |
| 3508 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 3509 void os::loop_breaker(int attempts) { | |
| 3510 os::yield_all(attempts); | |
| 3511 } | |
| 3512 | |
| 3513 //////////////////////////////////////////////////////////////////////////////// | |
| 3514 // thread priority support | |
| 3515 | |
| 3516 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 3517 // only supports dynamic priority, static priority must be zero. For real-time | |
| 3518 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
| 3519 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 3520 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 3521 // of 5 runs - Sep 2005). | |
| 3522 // | |
| 3523 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 3524 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 3525 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 3526 // threads. It has always been the case, but could change in the future. For | |
| 3527 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 3528 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 3529 | |
|
4854
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4803
diff
changeset
|
3530 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 0 | 3531 19, // 0 Entry should never be used |
| 3532 | |
| 3533 4, // 1 MinPriority | |
| 3534 3, // 2 | |
| 3535 2, // 3 | |
| 3536 | |
| 3537 1, // 4 | |
| 3538 0, // 5 NormPriority | |
| 3539 -1, // 6 | |
| 3540 | |
| 3541 -2, // 7 | |
| 3542 -3, // 8 | |
| 3543 -4, // 9 NearMaxPriority | |
| 3544 | |
|
4854
de268c8a8075
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4803
diff
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|
3545 -5, // 10 MaxPriority |
|
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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4803
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|
3546 |
|
de268c8a8075
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4803
diff
changeset
|
3547 -5 // 11 CriticalPriority |
| 0 | 3548 }; |
| 3549 | |
| 3550 static int prio_init() { | |
| 3551 if (ThreadPriorityPolicy == 1) { | |
| 3552 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 3553 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 3554 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 3555 if (geteuid() != 0) { | |
| 3556 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 3557 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
| 3558 } | |
| 3559 ThreadPriorityPolicy = 0; | |
| 3560 } | |
| 3561 } | |
|
4854
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4803
diff
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|
3562 if (UseCriticalJavaThreadPriority) { |
|
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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4803
diff
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|
3563 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
|
de268c8a8075
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4803
diff
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|
3564 } |
| 0 | 3565 return 0; |
| 3566 } | |
| 3567 | |
| 3568 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 3569 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 3570 | |
| 3571 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 3572 return (ret == 0) ? OS_OK : OS_ERR; | |
| 3573 } | |
| 3574 | |
| 3575 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 3576 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 3577 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 3578 return OS_OK; | |
| 3579 } | |
| 3580 | |
| 3581 errno = 0; | |
| 3582 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 3583 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 3584 } | |
| 3585 | |
| 3586 // Hint to the underlying OS that a task switch would not be good. | |
| 3587 // Void return because it's a hint and can fail. | |
| 3588 void os::hint_no_preempt() {} | |
| 3589 | |
| 3590 //////////////////////////////////////////////////////////////////////////////// | |
| 3591 // suspend/resume support | |
| 3592 | |
| 3593 // the low-level signal-based suspend/resume support is a remnant from the | |
| 3594 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 3595 // within hotspot. Now there is a single use-case for this: | |
| 3596 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 3597 // that runs in the watcher thread. | |
| 3598 // The remaining code is greatly simplified from the more general suspension | |
| 3599 // code that used to be used. | |
| 3600 // | |
| 3601 // The protocol is quite simple: | |
| 3602 // - suspend: | |
| 3603 // - sends a signal to the target thread | |
| 3604 // - polls the suspend state of the osthread using a yield loop | |
| 3605 // - target thread signal handler (SR_handler) sets suspend state | |
| 3606 // and blocks in sigsuspend until continued | |
| 3607 // - resume: | |
| 3608 // - sets target osthread state to continue | |
| 3609 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 3610 // | |
| 3611 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 3612 // | |
| 3613 | |
| 3614 static void resume_clear_context(OSThread *osthread) { | |
| 3615 osthread->set_ucontext(NULL); | |
| 3616 osthread->set_siginfo(NULL); | |
| 3617 } | |
| 3618 | |
| 3619 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 3620 osthread->set_ucontext(context); | |
| 3621 osthread->set_siginfo(siginfo); | |
| 3622 } | |
| 3623 | |
| 3624 // | |
| 3625 // Handler function invoked when a thread's execution is suspended or | |
| 3626 // resumed. We have to be careful that only async-safe functions are | |
| 3627 // called here (Note: most pthread functions are not async safe and | |
| 3628 // should be avoided.) | |
| 3629 // | |
| 3630 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 3631 // interface point of view, but sigwait() prevents the signal hander | |
| 3632 // from being run. libpthread would get very confused by not having | |
| 3633 // its signal handlers run and prevents sigwait()'s use with the | |
| 3634 // mutex granting granting signal. | |
| 3635 // | |
| 10405 | 3636 // Currently only ever called on the VMThread and JavaThreads (PC sampling) |
| 0 | 3637 // |
| 3638 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 3639 // Save and restore errno to avoid confusing native code with EINTR | |
| 3640 // after sigsuspend. | |
| 3641 int old_errno = errno; | |
| 3642 | |
| 3643 Thread* thread = Thread::current(); | |
| 3644 OSThread* osthread = thread->osthread(); | |
| 10405 | 3645 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
| 3646 | |
| 3647 os::SuspendResume::State current = osthread->sr.state(); | |
| 3648 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
| 0 | 3649 suspend_save_context(osthread, siginfo, context); |
| 3650 | |
| 10405 | 3651 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
| 3652 os::SuspendResume::State state = osthread->sr.suspended(); | |
| 3653 if (state == os::SuspendResume::SR_SUSPENDED) { | |
| 3654 sigset_t suspend_set; // signals for sigsuspend() | |
| 3655 | |
| 3656 // get current set of blocked signals and unblock resume signal | |
| 3657 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 3658 sigdelset(&suspend_set, SR_signum); | |
| 3659 | |
| 3660 sr_semaphore.signal(); | |
| 3661 // wait here until we are resumed | |
| 3662 while (1) { | |
| 3663 sigsuspend(&suspend_set); | |
| 3664 | |
| 3665 os::SuspendResume::State result = osthread->sr.running(); | |
| 3666 if (result == os::SuspendResume::SR_RUNNING) { | |
| 3667 sr_semaphore.signal(); | |
| 3668 break; | |
| 3669 } | |
| 3670 } | |
| 3671 | |
| 3672 } else if (state == os::SuspendResume::SR_RUNNING) { | |
| 3673 // request was cancelled, continue | |
| 3674 } else { | |
| 3675 ShouldNotReachHere(); | |
| 3676 } | |
| 0 | 3677 |
| 3678 resume_clear_context(osthread); | |
| 10405 | 3679 } else if (current == os::SuspendResume::SR_RUNNING) { |
| 3680 // request was cancelled, continue | |
| 3681 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 3682 // ignore | |
| 0 | 3683 } else { |
| 10405 | 3684 // ignore |
| 0 | 3685 } |
| 3686 | |
| 3687 errno = old_errno; | |
| 3688 } | |
| 3689 | |
| 3690 | |
| 3691 static int SR_initialize() { | |
| 3692 struct sigaction act; | |
| 3693 char *s; | |
| 3694 /* Get signal number to use for suspend/resume */ | |
| 3695 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 3696 int sig = ::strtol(s, 0, 10); | |
| 3697 if (sig > 0 || sig < _NSIG) { | |
| 3698 SR_signum = sig; | |
| 3699 } | |
| 3700 } | |
| 3701 | |
| 3702 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 3703 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 3704 | |
| 3705 sigemptyset(&SR_sigset); | |
| 3706 sigaddset(&SR_sigset, SR_signum); | |
| 3707 | |
| 3708 /* Set up signal handler for suspend/resume */ | |
| 3709 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 3710 act.sa_handler = (void (*)(int)) SR_handler; | |
| 3711 | |
| 3712 // SR_signum is blocked by default. | |
| 3713 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 3714 // supported Linux platforms). Note that LinuxThreads need to block | |
| 3715 // this signal for all threads to work properly. So we don't have | |
| 3716 // to use hard-coded signal number when setting up the mask. | |
| 3717 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 3718 | |
| 3719 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 3720 return -1; | |
| 3721 } | |
| 3722 | |
| 3723 // Save signal flag | |
| 3724 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
| 3725 return 0; | |
| 3726 } | |
| 3727 | |
| 10405 | 3728 static int sr_notify(OSThread* osthread) { |
| 3729 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 3730 assert_status(status == 0, status, "pthread_kill"); | |
| 3731 return status; | |
| 3732 } | |
| 3733 | |
| 3734 // "Randomly" selected value for how long we want to spin | |
| 3735 // before bailing out on suspending a thread, also how often | |
| 3736 // we send a signal to a thread we want to resume | |
| 3737 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
| 3738 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
| 0 | 3739 |
| 3740 // returns true on success and false on error - really an error is fatal | |
| 3741 // but this seems the normal response to library errors | |
| 3742 static bool do_suspend(OSThread* osthread) { | |
| 10405 | 3743 assert(osthread->sr.is_running(), "thread should be running"); |
| 3744 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
| 3745 | |
| 0 | 3746 // mark as suspended and send signal |
| 10405 | 3747 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
| 3748 // failed to switch, state wasn't running? | |
| 3749 ShouldNotReachHere(); | |
| 3750 return false; | |
| 3751 } | |
| 3752 | |
| 3753 if (sr_notify(osthread) != 0) { | |
| 3754 ShouldNotReachHere(); | |
| 3755 } | |
| 3756 | |
| 3757 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
| 3758 while (true) { | |
| 3759 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 3760 break; | |
| 3761 } else { | |
| 3762 // timeout | |
| 3763 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
| 3764 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
| 3765 return false; | |
| 3766 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
| 3767 // make sure that we consume the signal on the semaphore as well | |
| 3768 sr_semaphore.wait(); | |
| 3769 break; | |
| 3770 } else { | |
| 3771 ShouldNotReachHere(); | |
| 3772 return false; | |
| 3773 } | |
| 0 | 3774 } |
| 10405 | 3775 } |
| 3776 | |
| 3777 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
| 3778 return true; | |
| 0 | 3779 } |
| 3780 | |
| 3781 static void do_resume(OSThread* osthread) { | |
| 3782 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 10405 | 3783 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
| 3784 | |
| 3785 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 3786 // failed to switch to WAKEUP_REQUEST | |
| 3787 ShouldNotReachHere(); | |
| 3788 return; | |
| 3789 } | |
| 3790 | |
| 3791 while (true) { | |
| 3792 if (sr_notify(osthread) == 0) { | |
| 3793 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 3794 if (osthread->sr.is_running()) { | |
| 3795 return; | |
| 3796 } | |
| 3797 } | |
| 3798 } else { | |
| 3799 ShouldNotReachHere(); | |
| 0 | 3800 } |
| 3801 } | |
| 10405 | 3802 |
| 3803 guarantee(osthread->sr.is_running(), "Must be running!"); | |
| 0 | 3804 } |
| 3805 | |
| 3806 //////////////////////////////////////////////////////////////////////////////// | |
| 3807 // interrupt support | |
| 3808 | |
| 3809 void os::interrupt(Thread* thread) { | |
| 3810 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 3811 "possibility of dangling Thread pointer"); | |
| 3812 | |
| 3813 OSThread* osthread = thread->osthread(); | |
| 3814 | |
| 3815 if (!osthread->interrupted()) { | |
| 3816 osthread->set_interrupted(true); | |
| 3817 // More than one thread can get here with the same value of osthread, | |
| 3818 // resulting in multiple notifications. We do, however, want the store | |
| 3819 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 3820 OrderAccess::fence(); | |
| 3821 ParkEvent * const slp = thread->_SleepEvent ; | |
| 3822 if (slp != NULL) slp->unpark() ; | |
| 3823 } | |
| 3824 | |
| 3825 // For JSR166. Unpark even if interrupt status already was set | |
| 3826 if (thread->is_Java_thread()) | |
| 3827 ((JavaThread*)thread)->parker()->unpark(); | |
| 3828 | |
| 3829 ParkEvent * ev = thread->_ParkEvent ; | |
| 3830 if (ev != NULL) ev->unpark() ; | |
| 3831 | |
| 3832 } | |
| 3833 | |
| 3834 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 3835 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 3836 "possibility of dangling Thread pointer"); | |
| 3837 | |
| 3838 OSThread* osthread = thread->osthread(); | |
| 3839 | |
| 3840 bool interrupted = osthread->interrupted(); | |
| 3841 | |
| 3842 if (interrupted && clear_interrupted) { | |
| 3843 osthread->set_interrupted(false); | |
| 3844 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 3845 } | |
| 3846 | |
| 3847 return interrupted; | |
| 3848 } | |
| 3849 | |
| 3850 /////////////////////////////////////////////////////////////////////////////////// | |
| 3851 // signal handling (except suspend/resume) | |
| 3852 | |
| 3853 // This routine may be used by user applications as a "hook" to catch signals. | |
| 3854 // The user-defined signal handler must pass unrecognized signals to this | |
| 3855 // routine, and if it returns true (non-zero), then the signal handler must | |
| 3856 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 3857 // routine will never retun false (zero), but instead will execute a VM panic | |
| 3858 // routine kill the process. | |
| 3859 // | |
| 3860 // If this routine returns false, it is OK to call it again. This allows | |
| 3861 // the user-defined signal handler to perform checks either before or after | |
| 3862 // the VM performs its own checks. Naturally, the user code would be making | |
| 3863 // a serious error if it tried to handle an exception (such as a null check | |
| 3864 // or breakpoint) that the VM was generating for its own correct operation. | |
| 3865 // | |
| 3866 // This routine may recognize any of the following kinds of signals: | |
| 3867 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 3868 // It should be consulted by handlers for any of those signals. | |
| 3869 // | |
| 3870 // The caller of this routine must pass in the three arguments supplied | |
| 3871 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 3872 // field of the structure passed to sigaction(). This routine assumes that | |
| 3873 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 3874 // | |
| 3875 // Note that the VM will print warnings if it detects conflicting signal | |
| 3876 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 3877 // | |
| 2191 | 3878 extern "C" JNIEXPORT int |
| 0 | 3879 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
| 3880 void* ucontext, int abort_if_unrecognized); | |
| 3881 | |
| 3882 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 3883 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 8067 | 3884 int orig_errno = errno; // Preserve errno value over signal handler. |
| 0 | 3885 JVM_handle_linux_signal(sig, info, uc, true); |
| 8067 | 3886 errno = orig_errno; |
| 0 | 3887 } |
| 3888 | |
| 3889 | |
| 3890 // This boolean allows users to forward their own non-matching signals | |
| 3891 // to JVM_handle_linux_signal, harmlessly. | |
| 3892 bool os::Linux::signal_handlers_are_installed = false; | |
| 3893 | |
| 3894 // For signal-chaining | |
| 3895 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
| 3896 unsigned int os::Linux::sigs = 0; | |
| 3897 bool os::Linux::libjsig_is_loaded = false; | |
| 3898 typedef struct sigaction *(*get_signal_t)(int); | |
| 3899 get_signal_t os::Linux::get_signal_action = NULL; | |
| 3900 | |
| 3901 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
| 3902 struct sigaction *actp = NULL; | |
| 3903 | |
| 3904 if (libjsig_is_loaded) { | |
| 3905 // Retrieve the old signal handler from libjsig | |
| 3906 actp = (*get_signal_action)(sig); | |
| 3907 } | |
| 3908 if (actp == NULL) { | |
| 3909 // Retrieve the preinstalled signal handler from jvm | |
| 3910 actp = get_preinstalled_handler(sig); | |
| 3911 } | |
| 3912 | |
| 3913 return actp; | |
| 3914 } | |
| 3915 | |
| 3916 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 3917 siginfo_t *siginfo, void *context) { | |
| 3918 // Call the old signal handler | |
| 3919 if (actp->sa_handler == SIG_DFL) { | |
| 3920 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 3921 // instead of taking the default action. | |
| 3922 return false; | |
| 3923 } else if (actp->sa_handler != SIG_IGN) { | |
| 3924 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 3925 // automaticlly block the signal | |
| 3926 sigaddset(&(actp->sa_mask), sig); | |
| 3927 } | |
| 3928 | |
| 3929 sa_handler_t hand; | |
| 3930 sa_sigaction_t sa; | |
| 3931 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 3932 // retrieve the chained handler | |
| 3933 if (siginfo_flag_set) { | |
| 3934 sa = actp->sa_sigaction; | |
| 3935 } else { | |
| 3936 hand = actp->sa_handler; | |
| 3937 } | |
| 3938 | |
| 3939 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 3940 actp->sa_handler = SIG_DFL; | |
| 3941 } | |
| 3942 | |
| 3943 // try to honor the signal mask | |
| 3944 sigset_t oset; | |
| 3945 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 3946 | |
| 3947 // call into the chained handler | |
| 3948 if (siginfo_flag_set) { | |
| 3949 (*sa)(sig, siginfo, context); | |
| 3950 } else { | |
| 3951 (*hand)(sig); | |
| 3952 } | |
| 3953 | |
| 3954 // restore the signal mask | |
| 3955 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 3956 } | |
| 3957 // Tell jvm's signal handler the signal is taken care of. | |
| 3958 return true; | |
| 3959 } | |
| 3960 | |
| 3961 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 3962 bool chained = false; | |
| 3963 // signal-chaining | |
| 3964 if (UseSignalChaining) { | |
| 3965 struct sigaction *actp = get_chained_signal_action(sig); | |
| 3966 if (actp != NULL) { | |
| 3967 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 3968 } | |
| 3969 } | |
| 3970 return chained; | |
| 3971 } | |
| 3972 | |
| 3973 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
| 3974 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 3975 return &sigact[sig]; | |
| 3976 } | |
| 3977 return NULL; | |
| 3978 } | |
| 3979 | |
| 3980 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 3981 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3982 sigact[sig] = oldAct; | |
| 3983 sigs |= (unsigned int)1 << sig; | |
| 3984 } | |
| 3985 | |
| 3986 // for diagnostic | |
| 3987 int os::Linux::sigflags[MAXSIGNUM]; | |
| 3988 | |
| 3989 int os::Linux::get_our_sigflags(int sig) { | |
| 3990 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3991 return sigflags[sig]; | |
| 3992 } | |
| 3993 | |
| 3994 void os::Linux::set_our_sigflags(int sig, int flags) { | |
| 3995 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3996 sigflags[sig] = flags; | |
| 3997 } | |
| 3998 | |
| 3999 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
| 4000 // Check for overwrite. | |
| 4001 struct sigaction oldAct; | |
| 4002 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 4003 | |
| 4004 void* oldhand = oldAct.sa_sigaction | |
| 4005 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 4006 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 4007 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 4008 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 4009 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 4010 if (AllowUserSignalHandlers || !set_installed) { | |
| 4011 // Do not overwrite; user takes responsibility to forward to us. | |
| 4012 return; | |
| 4013 } else if (UseSignalChaining) { | |
| 4014 // save the old handler in jvm | |
| 4015 save_preinstalled_handler(sig, oldAct); | |
| 4016 // libjsig also interposes the sigaction() call below and saves the | |
| 4017 // old sigaction on it own. | |
| 4018 } else { | |
|
1490
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diff
changeset
|
4019 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
|
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diff
changeset
|
4020 "%#lx for signal %d.", (long)oldhand, sig)); |
| 0 | 4021 } |
| 4022 } | |
| 4023 | |
| 4024 struct sigaction sigAct; | |
| 4025 sigfillset(&(sigAct.sa_mask)); | |
| 4026 sigAct.sa_handler = SIG_DFL; | |
| 4027 if (!set_installed) { | |
| 4028 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 4029 } else { | |
| 4030 sigAct.sa_sigaction = signalHandler; | |
| 4031 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 4032 } | |
| 4033 // Save flags, which are set by ours | |
| 4034 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4035 sigflags[sig] = sigAct.sa_flags; | |
| 4036 | |
| 4037 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 4038 assert(ret == 0, "check"); | |
| 4039 | |
| 4040 void* oldhand2 = oldAct.sa_sigaction | |
| 4041 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 4042 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 4043 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 4044 } | |
| 4045 | |
| 4046 // install signal handlers for signals that HotSpot needs to | |
| 4047 // handle in order to support Java-level exception handling. | |
| 4048 | |
| 4049 void os::Linux::install_signal_handlers() { | |
| 4050 if (!signal_handlers_are_installed) { | |
| 4051 signal_handlers_are_installed = true; | |
| 4052 | |
| 4053 // signal-chaining | |
| 4054 typedef void (*signal_setting_t)(); | |
| 4055 signal_setting_t begin_signal_setting = NULL; | |
| 4056 signal_setting_t end_signal_setting = NULL; | |
| 4057 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 4058 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 4059 if (begin_signal_setting != NULL) { | |
| 4060 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 4061 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 4062 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 4063 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 4064 libjsig_is_loaded = true; | |
| 4065 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 4066 } | |
| 4067 if (libjsig_is_loaded) { | |
| 4068 // Tell libjsig jvm is setting signal handlers | |
| 4069 (*begin_signal_setting)(); | |
| 4070 } | |
| 4071 | |
| 4072 set_signal_handler(SIGSEGV, true); | |
| 4073 set_signal_handler(SIGPIPE, true); | |
| 4074 set_signal_handler(SIGBUS, true); | |
| 4075 set_signal_handler(SIGILL, true); | |
| 4076 set_signal_handler(SIGFPE, true); | |
| 4077 set_signal_handler(SIGXFSZ, true); | |
| 4078 | |
| 4079 if (libjsig_is_loaded) { | |
| 4080 // Tell libjsig jvm finishes setting signal handlers | |
| 4081 (*end_signal_setting)(); | |
| 4082 } | |
| 4083 | |
| 4084 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
|
3956
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3913
diff
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|
4085 // and if UserSignalHandler is installed all bets are off. |
|
3607aac85aa9
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3913
diff
changeset
|
4086 // Log that signal checking is off only if -verbose:jni is specified. |
| 0 | 4087 if (CheckJNICalls) { |
| 4088 if (libjsig_is_loaded) { | |
|
3956
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3913
diff
changeset
|
4089 if (PrintJNIResolving) { |
|
3607aac85aa9
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3913
diff
changeset
|
4090 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
|
3607aac85aa9
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3913
diff
changeset
|
4091 } |
| 0 | 4092 check_signals = false; |
| 4093 } | |
| 4094 if (AllowUserSignalHandlers) { | |
|
3956
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3913
diff
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|
4095 if (PrintJNIResolving) { |
|
3607aac85aa9
7051189: Need to suppress info message if -xcheck:jni used with libjsig.so
kevinw
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3913
diff
changeset
|
4096 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
|
3607aac85aa9
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3913
diff
changeset
|
4097 } |
| 0 | 4098 check_signals = false; |
| 4099 } | |
| 4100 } | |
| 4101 } | |
| 4102 } | |
| 4103 | |
| 4104 // This is the fastest way to get thread cpu time on Linux. | |
| 4105 // Returns cpu time (user+sys) for any thread, not only for current. | |
| 4106 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
| 4107 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
| 4108 // For reference, please, see IEEE Std 1003.1-2004: | |
| 4109 // http://www.unix.org/single_unix_specification | |
| 4110 | |
| 4111 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
| 4112 struct timespec tp; | |
| 4113 int rc = os::Linux::clock_gettime(clockid, &tp); | |
| 4114 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
| 4115 | |
|
4712
e7dead7e90af
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4082
diff
changeset
|
4116 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
| 0 | 4117 } |
| 4118 | |
| 4119 ///// | |
| 4120 // glibc on Linux platform uses non-documented flag | |
| 4121 // to indicate, that some special sort of signal | |
| 4122 // trampoline is used. | |
| 4123 // We will never set this flag, and we should | |
| 4124 // ignore this flag in our diagnostic | |
| 4125 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 4126 #undef SIGNIFICANT_SIGNAL_MASK | |
| 4127 #endif | |
| 4128 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 4129 | |
| 4130 static const char* get_signal_handler_name(address handler, | |
| 4131 char* buf, int buflen) { | |
| 4132 int offset; | |
| 4133 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 4134 if (found) { | |
| 4135 // skip directory names | |
| 4136 const char *p1, *p2; | |
| 4137 p1 = buf; | |
| 4138 size_t len = strlen(os::file_separator()); | |
| 4139 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 4140 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 4141 } else { | |
| 4142 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 4143 } | |
| 4144 return buf; | |
| 4145 } | |
| 4146 | |
| 4147 static void print_signal_handler(outputStream* st, int sig, | |
| 4148 char* buf, size_t buflen) { | |
| 4149 struct sigaction sa; | |
| 4150 | |
| 4151 sigaction(sig, NULL, &sa); | |
| 4152 | |
| 4153 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 4154 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 4155 | |
| 4156 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 4157 | |
| 4158 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 4159 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 4160 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 4161 | |
| 4162 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 4163 st->print("SIG_DFL"); | |
| 4164 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 4165 st->print("SIG_IGN"); | |
| 4166 } else { | |
| 4167 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 4168 } | |
| 4169 | |
| 4170 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
| 4171 | |
| 4172 address rh = VMError::get_resetted_sighandler(sig); | |
| 4173 // May be, handler was resetted by VMError? | |
| 4174 if(rh != NULL) { | |
| 4175 handler = rh; | |
| 4176 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 4177 } | |
| 4178 | |
| 4179 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
| 4180 | |
| 4181 // Check: is it our handler? | |
| 4182 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 4183 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 4184 // It is our signal handler | |
| 4185 // check for flags, reset system-used one! | |
| 4186 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
| 4187 st->print( | |
| 4188 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 4189 os::Linux::get_our_sigflags(sig)); | |
| 4190 } | |
| 4191 } | |
| 4192 st->cr(); | |
| 4193 } | |
| 4194 | |
| 4195 | |
| 4196 #define DO_SIGNAL_CHECK(sig) \ | |
| 4197 if (!sigismember(&check_signal_done, sig)) \ | |
| 4198 os::Linux::check_signal_handler(sig) | |
| 4199 | |
| 4200 // This method is a periodic task to check for misbehaving JNI applications | |
| 4201 // under CheckJNI, we can add any periodic checks here | |
| 4202 | |
| 4203 void os::run_periodic_checks() { | |
| 4204 | |
| 4205 if (check_signals == false) return; | |
| 4206 | |
| 4207 // SEGV and BUS if overridden could potentially prevent | |
| 4208 // generation of hs*.log in the event of a crash, debugging | |
| 4209 // such a case can be very challenging, so we absolutely | |
| 4210 // check the following for a good measure: | |
| 4211 DO_SIGNAL_CHECK(SIGSEGV); | |
| 4212 DO_SIGNAL_CHECK(SIGILL); | |
| 4213 DO_SIGNAL_CHECK(SIGFPE); | |
| 4214 DO_SIGNAL_CHECK(SIGBUS); | |
| 4215 DO_SIGNAL_CHECK(SIGPIPE); | |
| 4216 DO_SIGNAL_CHECK(SIGXFSZ); | |
| 4217 | |
| 4218 | |
| 4219 // ReduceSignalUsage allows the user to override these handlers | |
| 4220 // see comments at the very top and jvm_solaris.h | |
| 4221 if (!ReduceSignalUsage) { | |
| 4222 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 4223 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 4224 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 4225 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 4226 } | |
| 4227 | |
| 4228 DO_SIGNAL_CHECK(SR_signum); | |
| 4229 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 4230 } | |
| 4231 | |
| 4232 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 4233 | |
| 4234 static os_sigaction_t os_sigaction = NULL; | |
| 4235 | |
| 4236 void os::Linux::check_signal_handler(int sig) { | |
| 4237 char buf[O_BUFLEN]; | |
| 4238 address jvmHandler = NULL; | |
| 4239 | |
| 4240 | |
| 4241 struct sigaction act; | |
| 4242 if (os_sigaction == NULL) { | |
| 4243 // only trust the default sigaction, in case it has been interposed | |
| 4244 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 4245 if (os_sigaction == NULL) return; | |
| 4246 } | |
| 4247 | |
| 4248 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 4249 | |
| 4250 | |
| 4251 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 4252 | |
| 4253 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 4254 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 4255 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 4256 | |
| 4257 | |
| 4258 switch(sig) { | |
| 4259 case SIGSEGV: | |
| 4260 case SIGBUS: | |
| 4261 case SIGFPE: | |
| 4262 case SIGPIPE: | |
| 4263 case SIGILL: | |
| 4264 case SIGXFSZ: | |
| 4265 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 4266 break; | |
| 4267 | |
| 4268 case SHUTDOWN1_SIGNAL: | |
| 4269 case SHUTDOWN2_SIGNAL: | |
| 4270 case SHUTDOWN3_SIGNAL: | |
| 4271 case BREAK_SIGNAL: | |
| 4272 jvmHandler = (address)user_handler(); | |
| 4273 break; | |
| 4274 | |
| 4275 case INTERRUPT_SIGNAL: | |
| 4276 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 4277 break; | |
| 4278 | |
| 4279 default: | |
| 4280 if (sig == SR_signum) { | |
| 4281 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 4282 } else { | |
| 4283 return; | |
| 4284 } | |
| 4285 break; | |
| 4286 } | |
| 4287 | |
| 4288 if (thisHandler != jvmHandler) { | |
| 4289 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 4290 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 4291 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 4292 // No need to check this sig any longer | |
| 4293 sigaddset(&check_signal_done, sig); | |
| 4294 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
| 4295 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 4296 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
| 4297 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 4298 // No need to check this sig any longer | |
| 4299 sigaddset(&check_signal_done, sig); | |
| 4300 } | |
| 4301 | |
| 4302 // Dump all the signal | |
| 4303 if (sigismember(&check_signal_done, sig)) { | |
| 4304 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 4305 } | |
| 4306 } | |
| 4307 | |
| 4308 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 4309 | |
| 4310 extern bool signal_name(int signo, char* buf, size_t len); | |
| 4311 | |
| 4312 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 4313 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 4314 // signal | |
| 4315 if (!signal_name(exception_code, buf, size)) { | |
| 4316 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 4317 } | |
| 4318 return buf; | |
| 4319 } else { | |
| 4320 return NULL; | |
| 4321 } | |
| 4322 } | |
| 4323 | |
| 4324 // this is called _before_ the most of global arguments have been parsed | |
| 4325 void os::init(void) { | |
| 4326 char dummy; /* used to get a guess on initial stack address */ | |
| 4327 // first_hrtime = gethrtime(); | |
| 4328 | |
| 4329 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
| 4330 // is different than the pid of the java launcher thread. | |
| 4331 // So, on Linux, the launcher thread pid is passed to the VM | |
| 4332 // via the sun.java.launcher.pid property. | |
| 4333 // Use this property instead of getpid() if it was correctly passed. | |
| 4334 // See bug 6351349. | |
| 4335 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 4336 | |
| 4337 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 4338 | |
| 4339 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
| 4340 | |
| 4341 init_random(1234567); | |
| 4342 | |
| 4343 ThreadCritical::initialize(); | |
| 4344 | |
| 4345 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
| 4346 if (Linux::page_size() == -1) { | |
|
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4347 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
|
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4348 strerror(errno))); |
| 0 | 4349 } |
| 4350 init_page_sizes((size_t) Linux::page_size()); | |
| 4351 | |
| 4352 Linux::initialize_system_info(); | |
| 4353 | |
| 4354 // main_thread points to the aboriginal thread | |
| 4355 Linux::_main_thread = pthread_self(); | |
| 4356 | |
| 4357 Linux::clock_init(); | |
| 4358 initial_time_count = os::elapsed_counter(); | |
| 242 | 4359 pthread_mutex_init(&dl_mutex, NULL); |
|
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4360 |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
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10157
diff
changeset
|
4361 // If the pagesize of the VM is greater than 8K determine the appropriate |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4362 // number of initial guard pages. The user can change this with the |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4363 // command line arguments, if needed. |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4364 if (vm_page_size() > (int)Linux::vm_default_page_size()) { |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4365 StackYellowPages = 1; |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4366 StackRedPages = 1; |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4367 StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size(); |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4368 } |
| 0 | 4369 } |
| 4370 | |
| 4371 // To install functions for atexit system call | |
| 4372 extern "C" { | |
| 4373 static void perfMemory_exit_helper() { | |
| 4374 perfMemory_exit(); | |
| 4375 } | |
| 4376 } | |
| 4377 | |
| 4378 // this is called _after_ the global arguments have been parsed | |
| 4379 jint os::init_2(void) | |
| 4380 { | |
| 4381 Linux::fast_thread_clock_init(); | |
| 4382 | |
| 4383 // Allocate a single page and mark it as readable for safepoint polling | |
| 4384 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 4385 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 4386 | |
| 4387 os::set_polling_page( polling_page ); | |
| 4388 | |
| 4389 #ifndef PRODUCT | |
| 4390 if(Verbose && PrintMiscellaneous) | |
| 4391 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 4392 #endif | |
| 4393 | |
| 4394 if (!UseMembar) { | |
| 4395 address mem_serialize_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 4396 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
| 4397 os::set_memory_serialize_page( mem_serialize_page ); | |
| 4398 | |
| 4399 #ifndef PRODUCT | |
| 4400 if(Verbose && PrintMiscellaneous) | |
| 4401 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 4402 #endif | |
| 4403 } | |
| 4404 | |
|
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
4405 os::large_page_init(); |
| 0 | 4406 |
| 4407 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 4408 if (SR_initialize() != 0) { | |
| 4409 perror("SR_initialize failed"); | |
| 4410 return JNI_ERR; | |
| 4411 } | |
| 4412 | |
| 4413 Linux::signal_sets_init(); | |
| 4414 Linux::install_signal_handlers(); | |
| 4415 | |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4416 // Check minimum allowable stack size for thread creation and to initialize |
|
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4417 // the java system classes, including StackOverflowError - depends on page |
|
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4418 // size. Add a page for compiler2 recursion in main thread. |
|
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4419 // Add in 2*BytesPerWord times page size to account for VM stack during |
|
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4420 // class initialization depending on 32 or 64 bit VM. |
|
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4421 os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed, |
|
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4422 (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Linux::page_size() + |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4423 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::vm_default_page_size()); |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4424 |
| 0 | 4425 size_t threadStackSizeInBytes = ThreadStackSize * K; |
| 4426 if (threadStackSizeInBytes != 0 && | |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4427 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
| 0 | 4428 tty->print_cr("\nThe stack size specified is too small, " |
| 4429 "Specify at least %dk", | |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4430 os::Linux::min_stack_allowed/ K); |
| 0 | 4431 return JNI_ERR; |
| 4432 } | |
| 4433 | |
| 4434 // Make the stack size a multiple of the page size so that | |
| 4435 // the yellow/red zones can be guarded. | |
| 4436 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 4437 vm_page_size())); | |
| 4438 | |
| 4439 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
| 4440 | |
| 4441 Linux::libpthread_init(); | |
| 4442 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 4443 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
| 4444 Linux::glibc_version(), Linux::libpthread_version(), | |
| 4445 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
| 4446 } | |
| 4447 | |
| 141 | 4448 if (UseNUMA) { |
|
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4449 if (!Linux::libnuma_init()) { |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4450 UseNUMA = false; |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4451 } else { |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4452 if ((Linux::numa_max_node() < 1)) { |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4453 // There's only one node(they start from 0), disable NUMA. |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4454 UseNUMA = false; |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4455 } |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4456 } |
|
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4457 // With SHM large pages we cannot uncommit a page, so there's not way |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4458 // we can make the adaptive lgrp chunk resizing work. If the user specified |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4459 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4460 // disable adaptive resizing. |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4461 if (UseNUMA && UseLargePages && UseSHM) { |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4462 if (!FLAG_IS_DEFAULT(UseNUMA)) { |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4463 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) { |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4464 UseLargePages = false; |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4465 } else { |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4466 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing"); |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4467 UseAdaptiveSizePolicy = false; |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4468 UseAdaptiveNUMAChunkSizing = false; |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4469 } |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4470 } else { |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4471 UseNUMA = false; |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4472 } |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4473 } |
|
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4474 if (!UseNUMA && ForceNUMA) { |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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356
diff
changeset
|
4475 UseNUMA = true; |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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356
diff
changeset
|
4476 } |
| 141 | 4477 } |
| 4478 | |
| 0 | 4479 if (MaxFDLimit) { |
| 4480 // set the number of file descriptors to max. print out error | |
| 4481 // if getrlimit/setrlimit fails but continue regardless. | |
| 4482 struct rlimit nbr_files; | |
| 4483 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 4484 if (status != 0) { | |
| 4485 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 4486 perror("os::init_2 getrlimit failed"); | |
| 4487 } else { | |
| 4488 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 4489 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 4490 if (status != 0) { | |
| 4491 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 4492 perror("os::init_2 setrlimit failed"); | |
| 4493 } | |
| 4494 } | |
| 4495 } | |
| 4496 | |
| 4497 // Initialize lock used to serialize thread creation (see os::create_thread) | |
| 4498 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
| 4499 | |
| 4500 // at-exit methods are called in the reverse order of their registration. | |
| 4501 // atexit functions are called on return from main or as a result of a | |
| 4502 // call to exit(3C). There can be only 32 of these functions registered | |
| 4503 // and atexit() does not set errno. | |
| 4504 | |
| 4505 if (PerfAllowAtExitRegistration) { | |
| 4506 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 4507 // atexit functions can be delayed until process exit time, which | |
| 4508 // can be problematic for embedded VM situations. Embedded VMs should | |
| 4509 // call DestroyJavaVM() to assure that VM resources are released. | |
| 4510 | |
| 4511 // note: perfMemory_exit_helper atexit function may be removed in | |
| 4512 // the future if the appropriate cleanup code can be added to the | |
| 4513 // VM_Exit VMOperation's doit method. | |
| 4514 if (atexit(perfMemory_exit_helper) != 0) { | |
| 4515 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
| 4516 } | |
| 4517 } | |
| 4518 | |
| 4519 // initialize thread priority policy | |
| 4520 prio_init(); | |
| 4521 | |
| 4522 return JNI_OK; | |
| 4523 } | |
| 4524 | |
|
1681
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bobv
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diff
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|
4525 // this is called at the end of vm_initialization |
|
3802
b0b8491925fe
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jcoomes
parents:
3800
diff
changeset
|
4526 void os::init_3(void) |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4527 { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4528 #ifdef JAVASE_EMBEDDED |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4529 // Start the MemNotifyThread |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4530 if (LowMemoryProtection) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4531 MemNotifyThread::start(); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4532 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4533 return; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4534 #endif |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4535 } |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
4536 |
| 0 | 4537 // Mark the polling page as unreadable |
| 4538 void os::make_polling_page_unreadable(void) { | |
| 4539 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
| 4540 fatal("Could not disable polling page"); | |
| 4541 }; | |
| 4542 | |
| 4543 // Mark the polling page as readable | |
| 4544 void os::make_polling_page_readable(void) { | |
|
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4545 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
| 0 | 4546 fatal("Could not enable polling page"); |
|
237
1fdb98a17101
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coleenp
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235
diff
changeset
|
4547 } |
| 0 | 4548 }; |
| 4549 | |
| 4550 int os::active_processor_count() { | |
| 4551 // Linux doesn't yet have a (official) notion of processor sets, | |
| 4552 // so just return the number of online processors. | |
| 4553 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
| 4554 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
| 4555 return online_cpus; | |
| 4556 } | |
| 4557 | |
| 4006 | 4558 void os::set_native_thread_name(const char *name) { |
| 4559 // Not yet implemented. | |
| 4560 return; | |
| 4561 } | |
| 4562 | |
| 0 | 4563 bool os::distribute_processes(uint length, uint* distribution) { |
| 4564 // Not yet implemented. | |
| 4565 return false; | |
| 4566 } | |
| 4567 | |
| 4568 bool os::bind_to_processor(uint processor_id) { | |
| 4569 // Not yet implemented. | |
| 4570 return false; | |
| 4571 } | |
| 4572 | |
| 4573 /// | |
| 4574 | |
| 10405 | 4575 void os::SuspendedThreadTask::internal_do_task() { |
| 4576 if (do_suspend(_thread->osthread())) { | |
| 4577 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
| 4578 do_task(context); | |
| 4579 do_resume(_thread->osthread()); | |
| 4580 } | |
| 4581 } | |
| 4582 | |
| 4583 class PcFetcher : public os::SuspendedThreadTask { | |
| 4584 public: | |
| 4585 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
| 4586 ExtendedPC result(); | |
| 4587 protected: | |
| 4588 void do_task(const os::SuspendedThreadTaskContext& context); | |
| 4589 private: | |
| 4590 ExtendedPC _epc; | |
| 4591 }; | |
| 4592 | |
| 4593 ExtendedPC PcFetcher::result() { | |
| 4594 guarantee(is_done(), "task is not done yet."); | |
| 4595 return _epc; | |
| 4596 } | |
| 4597 | |
| 4598 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
| 4599 Thread* thread = context.thread(); | |
| 4600 OSThread* osthread = thread->osthread(); | |
| 4601 if (osthread->ucontext() != NULL) { | |
| 4602 _epc = os::Linux::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
| 4603 } else { | |
| 4604 // NULL context is unexpected, double-check this is the VMThread | |
| 4605 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 4606 } | |
| 4607 } | |
| 4608 | |
| 0 | 4609 // Suspends the target using the signal mechanism and then grabs the PC before |
| 4610 // resuming the target. Used by the flat-profiler only | |
| 4611 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 4612 // Make sure that it is called by the watcher for the VMThread | |
| 4613 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 4614 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 4615 | |
| 10405 | 4616 PcFetcher fetcher(thread); |
| 4617 fetcher.run(); | |
| 4618 return fetcher.result(); | |
| 0 | 4619 } |
| 4620 | |
| 4621 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 4622 { | |
| 4623 if (is_NPTL()) { | |
| 4624 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 4625 } else { | |
| 4626 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
| 4627 // word back to default 64bit precision if condvar is signaled. Java | |
| 4628 // wants 53bit precision. Save and restore current value. | |
| 4629 int fpu = get_fpu_control_word(); | |
| 4630 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 4631 set_fpu_control_word(fpu); | |
| 4632 return status; | |
| 4633 } | |
| 4634 } | |
| 4635 | |
| 4636 //////////////////////////////////////////////////////////////////////////////// | |
| 4637 // debug support | |
| 4638 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4639 bool os::find(address addr, outputStream* st) { |
| 0 | 4640 Dl_info dlinfo; |
| 4641 memset(&dlinfo, 0, sizeof(dlinfo)); | |
| 4642 if (dladdr(addr, &dlinfo)) { | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4643 st->print(PTR_FORMAT ": ", addr); |
| 0 | 4644 if (dlinfo.dli_sname != NULL) { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4645 st->print("%s+%#x", dlinfo.dli_sname, |
| 0 | 4646 addr - (intptr_t)dlinfo.dli_saddr); |
| 4647 } else if (dlinfo.dli_fname) { | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4648 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
| 0 | 4649 } else { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4650 st->print("<absolute address>"); |
| 0 | 4651 } |
| 4652 if (dlinfo.dli_fname) { | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4653 st->print(" in %s", dlinfo.dli_fname); |
| 0 | 4654 } |
| 4655 if (dlinfo.dli_fbase) { | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4656 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
| 0 | 4657 } |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4658 st->cr(); |
| 0 | 4659 |
| 4660 if (Verbose) { | |
| 4661 // decode some bytes around the PC | |
|
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
4662 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
|
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
4663 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
| 0 | 4664 address lowest = (address) dlinfo.dli_sname; |
| 4665 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 4666 if (begin < lowest) begin = lowest; | |
| 4667 Dl_info dlinfo2; | |
| 4668 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
| 4669 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
| 4670 end = (address) dlinfo2.dli_saddr; | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4671 Disassembler::decode(begin, end, st); |
| 0 | 4672 } |
| 4673 return true; | |
| 4674 } | |
| 4675 return false; | |
| 4676 } | |
| 4677 | |
| 4678 //////////////////////////////////////////////////////////////////////////////// | |
| 4679 // misc | |
| 4680 | |
| 4681 // This does not do anything on Linux. This is basically a hook for being | |
| 4682 // able to use structured exception handling (thread-local exception filters) | |
| 4683 // on, e.g., Win32. | |
| 4684 void | |
| 4685 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 4686 JavaCallArguments* args, Thread* thread) { | |
| 4687 f(value, method, args, thread); | |
| 4688 } | |
| 4689 | |
| 4690 void os::print_statistics() { | |
| 4691 } | |
| 4692 | |
| 4693 int os::message_box(const char* title, const char* message) { | |
| 4694 int i; | |
| 4695 fdStream err(defaultStream::error_fd()); | |
| 4696 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 4697 err.cr(); | |
| 4698 err.print_raw_cr(title); | |
| 4699 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 4700 err.cr(); | |
| 4701 err.print_raw_cr(message); | |
| 4702 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 4703 err.cr(); | |
| 4704 | |
| 4705 char buf[16]; | |
| 4706 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 4707 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 4708 | |
| 4709 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 4710 } | |
| 4711 | |
| 4712 int os::stat(const char *path, struct stat *sbuf) { | |
| 4713 char pathbuf[MAX_PATH]; | |
| 4714 if (strlen(path) > MAX_PATH - 1) { | |
| 4715 errno = ENAMETOOLONG; | |
| 4716 return -1; | |
| 4717 } | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4718 os::native_path(strcpy(pathbuf, path)); |
| 0 | 4719 return ::stat(pathbuf, sbuf); |
| 4720 } | |
| 4721 | |
| 4722 bool os::check_heap(bool force) { | |
| 4723 return true; | |
| 4724 } | |
| 4725 | |
| 4726 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 4727 return ::vsnprintf(buf, count, format, args); | |
| 4728 } | |
| 4729 | |
| 4730 // Is a (classpath) directory empty? | |
| 4731 bool os::dir_is_empty(const char* path) { | |
| 4732 DIR *dir = NULL; | |
| 4733 struct dirent *ptr; | |
| 4734 | |
| 4735 dir = opendir(path); | |
| 4736 if (dir == NULL) return true; | |
| 4737 | |
| 4738 /* Scan the directory */ | |
| 4739 bool result = true; | |
| 4740 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 4741 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 4742 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 4743 result = false; | |
| 4744 } | |
| 4745 } | |
| 4746 closedir(dir); | |
| 4747 return result; | |
| 4748 } | |
| 4749 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4750 // This code originates from JDK's sysOpen and open64_w |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4751 // from src/solaris/hpi/src/system_md.c |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4752 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4753 #ifndef O_DELETE |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4754 #define O_DELETE 0x10000 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4755 #endif |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4756 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4757 // Open a file. Unlink the file immediately after open returns |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4758 // if the specified oflag has the O_DELETE flag set. |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4759 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4760 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4761 int os::open(const char *path, int oflag, int mode) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4762 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4763 if (strlen(path) > MAX_PATH - 1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4764 errno = ENAMETOOLONG; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4765 return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4766 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4767 int fd; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4768 int o_delete = (oflag & O_DELETE); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4769 oflag = oflag & ~O_DELETE; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4770 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4771 fd = ::open64(path, oflag, mode); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4772 if (fd == -1) return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4773 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4774 //If the open succeeded, the file might still be a directory |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4775 { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4776 struct stat64 buf64; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4777 int ret = ::fstat64(fd, &buf64); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4778 int st_mode = buf64.st_mode; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4779 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4780 if (ret != -1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4781 if ((st_mode & S_IFMT) == S_IFDIR) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4782 errno = EISDIR; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4783 ::close(fd); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4784 return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4785 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4786 } else { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4787 ::close(fd); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4788 return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4789 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4790 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4791 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4792 /* |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4793 * All file descriptors that are opened in the JVM and not |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4794 * specifically destined for a subprocess should have the |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4795 * close-on-exec flag set. If we don't set it, then careless 3rd |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4796 * party native code might fork and exec without closing all |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4797 * appropriate file descriptors (e.g. as we do in closeDescriptors in |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4798 * UNIXProcess.c), and this in turn might: |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4799 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4800 * - cause end-of-file to fail to be detected on some file |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4801 * descriptors, resulting in mysterious hangs, or |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4802 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4803 * - might cause an fopen in the subprocess to fail on a system |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4804 * suffering from bug 1085341. |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4805 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4806 * (Yes, the default setting of the close-on-exec flag is a Unix |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4807 * design flaw) |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4808 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4809 * See: |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4810 * 1085341: 32-bit stdio routines should support file descriptors >255 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4811 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4812 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4813 */ |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4814 #ifdef FD_CLOEXEC |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4815 { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4816 int flags = ::fcntl(fd, F_GETFD); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4817 if (flags != -1) |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4818 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4819 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4820 #endif |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4821 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4822 if (o_delete != 0) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4823 ::unlink(path); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4824 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4825 return fd; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4826 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4827 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4828 |
| 0 | 4829 // create binary file, rewriting existing file if required |
| 4830 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 4831 int oflags = O_WRONLY | O_CREAT; | |
| 4832 if (!rewrite_existing) { | |
| 4833 oflags |= O_EXCL; | |
| 4834 } | |
| 4835 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
| 4836 } | |
| 4837 | |
| 4838 // return current position of file pointer | |
| 4839 jlong os::current_file_offset(int fd) { | |
| 4840 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
| 4841 } | |
| 4842 | |
| 4843 // move file pointer to the specified offset | |
| 4844 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 4845 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
| 4846 } | |
| 4847 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4848 // This code originates from JDK's sysAvailable |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4849 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4850 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4851 int os::available(int fd, jlong *bytes) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4852 jlong cur, end; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4853 int mode; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4854 struct stat64 buf64; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4855 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4856 if (::fstat64(fd, &buf64) >= 0) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4857 mode = buf64.st_mode; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4858 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4859 /* |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4860 * XXX: is the following call interruptible? If so, this might |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4861 * need to go through the INTERRUPT_IO() wrapper as for other |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4862 * blocking, interruptible calls in this file. |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4863 */ |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4864 int n; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4865 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4866 *bytes = n; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4867 return 1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4868 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4869 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4870 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4871 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4872 return 0; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4873 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4874 return 0; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4875 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4876 return 0; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4877 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4878 *bytes = end - cur; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4879 return 1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4880 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4881 |
|
2033
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4882 int os::socket_available(int fd, jint *pbytes) { |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4883 // Linux doc says EINTR not returned, unlike Solaris |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4884 int ret = ::ioctl(fd, FIONREAD, pbytes); |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4885 |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4886 //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4887 // is expected to return 0 on failure and 1 on success to the jdk. |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4888 return (ret < 0) ? 0 : 1; |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4889 } |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4890 |
| 0 | 4891 // Map a block of memory. |
| 6197 | 4892 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 0 | 4893 char *addr, size_t bytes, bool read_only, |
| 4894 bool allow_exec) { | |
| 4895 int prot; | |
| 5909 | 4896 int flags = MAP_PRIVATE; |
| 0 | 4897 |
| 4898 if (read_only) { | |
| 4899 prot = PROT_READ; | |
| 4900 } else { | |
| 4901 prot = PROT_READ | PROT_WRITE; | |
| 4902 } | |
| 4903 | |
| 4904 if (allow_exec) { | |
| 4905 prot |= PROT_EXEC; | |
| 4906 } | |
| 4907 | |
| 4908 if (addr != NULL) { | |
| 4909 flags |= MAP_FIXED; | |
| 4910 } | |
| 4911 | |
| 4912 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 4913 fd, file_offset); | |
| 4914 if (mapped_address == MAP_FAILED) { | |
| 4915 return NULL; | |
| 4916 } | |
| 4917 return mapped_address; | |
| 4918 } | |
| 4919 | |
| 4920 | |
| 4921 // Remap a block of memory. | |
| 6197 | 4922 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 0 | 4923 char *addr, size_t bytes, bool read_only, |
| 4924 bool allow_exec) { | |
| 4925 // same as map_memory() on this OS | |
| 4926 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 4927 allow_exec); | |
| 4928 } | |
| 4929 | |
| 4930 | |
| 4931 // Unmap a block of memory. | |
| 6197 | 4932 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 0 | 4933 return munmap(addr, bytes) == 0; |
| 4934 } | |
| 4935 | |
| 4936 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
| 4937 | |
| 4938 static clockid_t thread_cpu_clockid(Thread* thread) { | |
| 4939 pthread_t tid = thread->osthread()->pthread_id(); | |
| 4940 clockid_t clockid; | |
| 4941 | |
| 4942 // Get thread clockid | |
| 4943 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
| 4944 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
| 4945 return clockid; | |
| 4946 } | |
| 4947 | |
| 4948 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 4949 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 4950 // of a thread. | |
| 4951 // | |
| 4952 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 4953 // the fast estimate available on the platform. | |
| 4954 | |
| 4955 jlong os::current_thread_cpu_time() { | |
| 4956 if (os::Linux::supports_fast_thread_cpu_time()) { | |
| 4957 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
| 4958 } else { | |
| 4959 // return user + sys since the cost is the same | |
| 4960 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
| 4961 } | |
| 4962 } | |
| 4963 | |
| 4964 jlong os::thread_cpu_time(Thread* thread) { | |
| 4965 // consistent with what current_thread_cpu_time() returns | |
| 4966 if (os::Linux::supports_fast_thread_cpu_time()) { | |
| 4967 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
| 4968 } else { | |
| 4969 return slow_thread_cpu_time(thread, true /* user + sys */); | |
| 4970 } | |
| 4971 } | |
| 4972 | |
| 4973 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 4974 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
| 4975 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
| 4976 } else { | |
| 4977 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
| 4978 } | |
| 4979 } | |
| 4980 | |
| 4981 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 4982 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
| 4983 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
| 4984 } else { | |
| 4985 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
| 4986 } | |
| 4987 } | |
| 4988 | |
| 4989 // | |
| 4990 // -1 on error. | |
| 4991 // | |
| 4992 | |
| 4993 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 4994 static bool proc_task_unchecked = true; | |
| 4995 static const char *proc_stat_path = "/proc/%d/stat"; | |
| 4996 pid_t tid = thread->osthread()->thread_id(); | |
| 4997 char *s; | |
| 4998 char stat[2048]; | |
| 4999 int statlen; | |
| 5000 char proc_name[64]; | |
| 5001 int count; | |
| 5002 long sys_time, user_time; | |
|
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|
5003 char cdummy; |
| 0 | 5004 int idummy; |
| 5005 long ldummy; | |
| 5006 FILE *fp; | |
| 5007 | |
| 5008 // The /proc/<tid>/stat aggregates per-process usage on | |
| 5009 // new Linux kernels 2.6+ where NPTL is supported. | |
| 5010 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
| 5011 // See bug 6328462. | |
|
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|
5012 // There possibly can be cases where there is no directory |
|
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|
5013 // /proc/self/task, so we check its availability. |
| 0 | 5014 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
| 5015 // This is executed only once | |
| 5016 proc_task_unchecked = false; | |
| 5017 fp = fopen("/proc/self/task", "r"); | |
| 5018 if (fp != NULL) { | |
| 5019 proc_stat_path = "/proc/self/task/%d/stat"; | |
| 5020 fclose(fp); | |
| 5021 } | |
| 5022 } | |
| 5023 | |
| 5024 sprintf(proc_name, proc_stat_path, tid); | |
| 5025 fp = fopen(proc_name, "r"); | |
| 5026 if ( fp == NULL ) return -1; | |
| 5027 statlen = fread(stat, 1, 2047, fp); | |
| 5028 stat[statlen] = '\0'; | |
| 5029 fclose(fp); | |
| 5030 | |
| 5031 // Skip pid and the command string. Note that we could be dealing with | |
| 5032 // weird command names, e.g. user could decide to rename java launcher | |
| 5033 // to "java 1.4.2 :)", then the stat file would look like | |
| 5034 // 1234 (java 1.4.2 :)) R ... ... | |
| 5035 // We don't really need to know the command string, just find the last | |
| 5036 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
| 5037 s = strrchr(stat, ')'); | |
| 5038 if (s == NULL ) return -1; | |
| 5039 | |
| 5040 // Skip blank chars | |
| 5041 do s++; while (isspace(*s)); | |
| 5042 | |
|
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|
5043 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
|
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5044 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
| 0 | 5045 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
| 5046 &user_time, &sys_time); | |
|
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|
5047 if ( count != 13 ) return -1; |
| 0 | 5048 if (user_sys_cpu_time) { |
| 5049 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
| 5050 } else { | |
| 5051 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
| 5052 } | |
| 5053 } | |
| 5054 | |
| 5055 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 5056 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 5057 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 5058 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 5059 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 5060 } | |
| 5061 | |
| 5062 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 5063 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 5064 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 5065 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 5066 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 5067 } | |
| 5068 | |
| 5069 bool os::is_thread_cpu_time_supported() { | |
| 5070 return true; | |
| 5071 } | |
| 5072 | |
| 5073 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 5074 // Linux doesn't yet have a (official) notion of processor sets, | |
| 5075 // so just return the system wide load average. | |
| 5076 int os::loadavg(double loadavg[], int nelem) { | |
| 5077 return ::getloadavg(loadavg, nelem); | |
| 5078 } | |
| 5079 | |
| 5080 void os::pause() { | |
| 5081 char filename[MAX_PATH]; | |
| 5082 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 5083 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 5084 } else { | |
| 5085 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 5086 } | |
| 5087 | |
| 5088 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 5089 if (fd != -1) { | |
| 5090 struct stat buf; | |
|
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|
5091 ::close(fd); |
| 0 | 5092 while (::stat(filename, &buf) == 0) { |
| 5093 (void)::poll(NULL, 0, 100); | |
| 5094 } | |
| 5095 } else { | |
| 5096 jio_fprintf(stderr, | |
| 5097 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 5098 } | |
| 5099 } | |
| 5100 | |
| 5101 | |
| 5102 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 5103 // | |
| 5104 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 5105 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 5106 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 5107 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 5108 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 5109 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 5110 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 5111 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 5112 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 5113 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 5114 // of libpthread avoids the problem, but isn't practical. | |
| 5115 // | |
| 5116 // Possible remedies: | |
| 5117 // | |
| 5118 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 5119 // This is palliative and probabilistic, however. If the thread is preempted | |
| 5120 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 5121 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 5122 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 5123 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 5124 // | |
| 5125 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 5126 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 5127 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 5128 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 5129 // thread. | |
| 5130 // | |
| 5131 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 5132 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 5133 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 5134 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 5135 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 5136 // timers in a graceful fashion. | |
| 5137 // | |
| 5138 // 4. When the abstime value is in the past it appears that control returns | |
| 5139 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 5140 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 5141 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 5142 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 5143 // It may be possible to avoid reinitialization by checking the return | |
| 5144 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 5145 // condvar we must establish the invariant that cond_signal() is only called | |
| 5146 // within critical sections protected by the adjunct mutex. This prevents | |
| 5147 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 5148 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 5149 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 5150 // | |
| 5151 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 5152 // structure when a condvar is used or initialized. cond_destroy() would | |
| 5153 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 5154 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 5155 // | |
| 5156 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 5157 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 5158 // and only enabling the work-around for vulnerable environments. | |
| 5159 | |
| 5160 // utility to compute the abstime argument to timedwait: | |
| 5161 // millis is the relative timeout time | |
| 5162 // abstime will be the absolute timeout time | |
| 5163 // TODO: replace compute_abstime() with unpackTime() | |
| 5164 | |
| 5165 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
| 5166 if (millis < 0) millis = 0; | |
| 5167 struct timeval now; | |
| 5168 int status = gettimeofday(&now, NULL); | |
| 5169 assert(status == 0, "gettimeofday"); | |
| 5170 jlong seconds = millis / 1000; | |
| 5171 millis %= 1000; | |
| 5172 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 5173 seconds = 50000000; | |
| 5174 } | |
| 5175 abstime->tv_sec = now.tv_sec + seconds; | |
| 5176 long usec = now.tv_usec + millis * 1000; | |
| 5177 if (usec >= 1000000) { | |
| 5178 abstime->tv_sec += 1; | |
| 5179 usec -= 1000000; | |
| 5180 } | |
| 5181 abstime->tv_nsec = usec * 1000; | |
| 5182 return abstime; | |
| 5183 } | |
| 5184 | |
| 5185 | |
| 5186 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 5187 // Conceptually TryPark() should be equivalent to park(0). | |
| 5188 | |
| 5189 int os::PlatformEvent::TryPark() { | |
| 5190 for (;;) { | |
| 5191 const int v = _Event ; | |
| 5192 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 5193 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 5194 } | |
| 5195 } | |
| 5196 | |
| 5197 void os::PlatformEvent::park() { // AKA "down()" | |
| 5198 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 5199 // may call park(). | |
| 5200 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 5201 int v ; | |
| 5202 for (;;) { | |
| 5203 v = _Event ; | |
| 5204 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 5205 } | |
| 5206 guarantee (v >= 0, "invariant") ; | |
| 5207 if (v == 0) { | |
| 5208 // Do this the hard way by blocking ... | |
| 5209 int status = pthread_mutex_lock(_mutex); | |
| 5210 assert_status(status == 0, status, "mutex_lock"); | |
| 5211 guarantee (_nParked == 0, "invariant") ; | |
| 5212 ++ _nParked ; | |
| 5213 while (_Event < 0) { | |
| 5214 status = pthread_cond_wait(_cond, _mutex); | |
| 5215 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 5216 // Treat this the same as if the wait was interrupted | |
| 5217 if (status == ETIME) { status = EINTR; } | |
| 5218 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 5219 } | |
| 5220 -- _nParked ; | |
| 5221 | |
| 5222 _Event = 0 ; | |
| 5223 status = pthread_mutex_unlock(_mutex); | |
| 5224 assert_status(status == 0, status, "mutex_unlock"); | |
|
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5225 // Paranoia to ensure our locked and lock-free paths interact |
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5226 // correctly with each other. |
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|
5227 OrderAccess::fence(); |
| 0 | 5228 } |
| 5229 guarantee (_Event >= 0, "invariant") ; | |
| 5230 } | |
| 5231 | |
| 5232 int os::PlatformEvent::park(jlong millis) { | |
| 5233 guarantee (_nParked == 0, "invariant") ; | |
| 5234 | |
| 5235 int v ; | |
| 5236 for (;;) { | |
| 5237 v = _Event ; | |
| 5238 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 5239 } | |
| 5240 guarantee (v >= 0, "invariant") ; | |
| 5241 if (v != 0) return OS_OK ; | |
| 5242 | |
| 5243 // We do this the hard way, by blocking the thread. | |
| 5244 // Consider enforcing a minimum timeout value. | |
| 5245 struct timespec abst; | |
| 5246 compute_abstime(&abst, millis); | |
| 5247 | |
| 5248 int ret = OS_TIMEOUT; | |
| 5249 int status = pthread_mutex_lock(_mutex); | |
| 5250 assert_status(status == 0, status, "mutex_lock"); | |
| 5251 guarantee (_nParked == 0, "invariant") ; | |
| 5252 ++_nParked ; | |
| 5253 | |
| 5254 // Object.wait(timo) will return because of | |
| 5255 // (a) notification | |
| 5256 // (b) timeout | |
| 5257 // (c) thread.interrupt | |
| 5258 // | |
| 5259 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 5260 // That is, we treat thread.interrupt as a special case of notification. | |
| 5261 // The underlying Solaris implementation, cond_timedwait, admits | |
| 5262 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 5263 // JVM from making those visible to Java code. As such, we must | |
| 5264 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 5265 // | |
| 5266 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 5267 // In that case, we should propagate the notify to another waiter. | |
| 5268 | |
| 5269 while (_Event < 0) { | |
| 5270 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 5271 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 5272 pthread_cond_destroy (_cond); | |
| 5273 pthread_cond_init (_cond, NULL) ; | |
| 5274 } | |
| 5275 assert_status(status == 0 || status == EINTR || | |
| 5276 status == ETIME || status == ETIMEDOUT, | |
| 5277 status, "cond_timedwait"); | |
| 5278 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 5279 if (status == ETIME || status == ETIMEDOUT) break ; | |
| 5280 // We consume and ignore EINTR and spurious wakeups. | |
| 5281 } | |
| 5282 --_nParked ; | |
| 5283 if (_Event >= 0) { | |
| 5284 ret = OS_OK; | |
| 5285 } | |
| 5286 _Event = 0 ; | |
| 5287 status = pthread_mutex_unlock(_mutex); | |
| 5288 assert_status(status == 0, status, "mutex_unlock"); | |
| 5289 assert (_nParked == 0, "invariant") ; | |
|
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5290 // Paranoia to ensure our locked and lock-free paths interact |
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|
5291 // correctly with each other. |
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|
5292 OrderAccess::fence(); |
| 0 | 5293 return ret; |
| 5294 } | |
| 5295 | |
| 5296 void os::PlatformEvent::unpark() { | |
|
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5297 // Transitions for _Event: |
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|
5298 // 0 :=> 1 |
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|
5299 // 1 :=> 1 |
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5300 // -1 :=> either 0 or 1; must signal target thread |
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5301 // That is, we can safely transition _Event from -1 to either |
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5302 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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5303 // unpark() calls. |
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5304 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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5305 // |
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5306 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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5307 // that it will take two back-to-back park() calls for the owning |
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5308 // thread to block. This has the benefit of forcing a spurious return |
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5309 // from the first park() call after an unpark() call which will help |
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5310 // shake out uses of park() and unpark() without condition variables. |
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5311 |
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5312 if (Atomic::xchg(1, &_Event) >= 0) return; |
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5313 |
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5314 // Wait for the thread associated with the event to vacate |
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5315 int status = pthread_mutex_lock(_mutex); |
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5316 assert_status(status == 0, status, "mutex_lock"); |
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5317 int AnyWaiters = _nParked; |
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5318 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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5319 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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5320 AnyWaiters = 0; |
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5321 pthread_cond_signal(_cond); |
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5322 } |
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5323 status = pthread_mutex_unlock(_mutex); |
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5324 assert_status(status == 0, status, "mutex_unlock"); |
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5325 if (AnyWaiters != 0) { |
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diff
changeset
|
5326 status = pthread_cond_signal(_cond); |
|
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diff
changeset
|
5327 assert_status(status == 0, status, "cond_signal"); |
| 0 | 5328 } |
| 5329 | |
| 5330 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 5331 // This is safe and avoids a common class of futile wakeups. In rare | |
| 5332 // circumstances this can cause a thread to return prematurely from | |
| 5333 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 5334 // simply re-test the condition and re-park itself. | |
| 5335 } | |
| 5336 | |
| 5337 | |
| 5338 // JSR166 | |
| 5339 // ------------------------------------------------------- | |
| 5340 | |
| 5341 /* | |
| 5342 * The solaris and linux implementations of park/unpark are fairly | |
| 5343 * conservative for now, but can be improved. They currently use a | |
| 5344 * mutex/condvar pair, plus a a count. | |
| 5345 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 5346 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 5347 * on the condvar. Contention seen when trying to park implies that someone | |
| 5348 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 5349 * is no need to track notifications. | |
| 5350 */ | |
| 5351 | |
| 5352 #define MAX_SECS 100000000 | |
| 5353 /* | |
| 5354 * This code is common to linux and solaris and will be moved to a | |
| 5355 * common place in dolphin. | |
| 5356 * | |
| 5357 * The passed in time value is either a relative time in nanoseconds | |
| 5358 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 5359 * into suitable seconds and nanoseconds components and stored in the | |
| 5360 * given timespec structure. | |
| 5361 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 5362 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
| 5363 * overflow if times way in the future are given. Further on Solaris versions | |
| 5364 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 5365 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 5366 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 5367 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 5368 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 5369 * years from "now". | |
| 5370 */ | |
| 5371 | |
| 5372 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
| 5373 assert (time > 0, "convertTime"); | |
| 5374 | |
| 5375 struct timeval now; | |
| 5376 int status = gettimeofday(&now, NULL); | |
| 5377 assert(status == 0, "gettimeofday"); | |
| 5378 | |
| 5379 time_t max_secs = now.tv_sec + MAX_SECS; | |
| 5380 | |
| 5381 if (isAbsolute) { | |
| 5382 jlong secs = time / 1000; | |
| 5383 if (secs > max_secs) { | |
| 5384 absTime->tv_sec = max_secs; | |
| 5385 } | |
| 5386 else { | |
| 5387 absTime->tv_sec = secs; | |
| 5388 } | |
| 5389 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
| 5390 } | |
| 5391 else { | |
| 5392 jlong secs = time / NANOSECS_PER_SEC; | |
| 5393 if (secs >= MAX_SECS) { | |
| 5394 absTime->tv_sec = max_secs; | |
| 5395 absTime->tv_nsec = 0; | |
| 5396 } | |
| 5397 else { | |
| 5398 absTime->tv_sec = now.tv_sec + secs; | |
| 5399 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
| 5400 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
| 5401 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 5402 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 5403 } | |
| 5404 } | |
| 5405 } | |
| 5406 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 5407 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 5408 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 5409 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 5410 } | |
| 5411 | |
| 5412 void Parker::park(bool isAbsolute, jlong time) { | |
|
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|
5413 // Ideally we'd do something useful while spinning, such |
|
22ba8c8ce6a6
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|
5414 // as calling unpackTime(). |
|
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|
5415 |
| 0 | 5416 // Optional fast-path check: |
| 5417 // Return immediately if a permit is available. | |
|
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|
5418 // We depend on Atomic::xchg() having full barrier semantics |
|
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|
5419 // since we are doing a lock-free update to _counter. |
|
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|
5420 if (Atomic::xchg(0, &_counter) > 0) return; |
| 0 | 5421 |
| 5422 Thread* thread = Thread::current(); | |
| 5423 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 5424 JavaThread *jt = (JavaThread *)thread; | |
| 5425 | |
| 5426 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 5427 // Check interrupt before trying to wait | |
| 5428 if (Thread::is_interrupted(thread, false)) { | |
| 5429 return; | |
| 5430 } | |
| 5431 | |
| 5432 // Next, demultiplex/decode time arguments | |
| 5433 timespec absTime; | |
|
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diff
changeset
|
5434 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
| 0 | 5435 return; |
| 5436 } | |
| 5437 if (time > 0) { | |
| 5438 unpackTime(&absTime, isAbsolute, time); | |
| 5439 } | |
| 5440 | |
| 5441 | |
| 5442 // Enter safepoint region | |
| 5443 // Beware of deadlocks such as 6317397. | |
| 5444 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 5445 // In particular a thread must never block on the Threads_lock while | |
| 5446 // holding the Parker:: mutex. If safepoints are pending both the | |
| 5447 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 5448 ThreadBlockInVM tbivm(jt); | |
| 5449 | |
| 5450 // Don't wait if cannot get lock since interference arises from | |
| 5451 // unblocking. Also. check interrupt before trying wait | |
| 5452 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 5453 return; | |
| 5454 } | |
| 5455 | |
| 5456 int status ; | |
| 5457 if (_counter > 0) { // no wait needed | |
| 5458 _counter = 0; | |
| 5459 status = pthread_mutex_unlock(_mutex); | |
| 5460 assert (status == 0, "invariant") ; | |
|
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|
5461 // Paranoia to ensure our locked and lock-free paths interact |
|
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|
5462 // correctly with each other and Java-level accesses. |
|
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diff
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|
5463 OrderAccess::fence(); |
| 0 | 5464 return; |
| 5465 } | |
| 5466 | |
| 5467 #ifdef ASSERT | |
| 5468 // Don't catch signals while blocked; let the running threads have the signals. | |
| 5469 // (This allows a debugger to break into the running thread.) | |
| 5470 sigset_t oldsigs; | |
| 5471 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
| 5472 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 5473 #endif | |
| 5474 | |
| 5475 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 5476 jt->set_suspend_equivalent(); | |
| 5477 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 5478 | |
| 5479 if (time == 0) { | |
| 5480 status = pthread_cond_wait (_cond, _mutex) ; | |
| 5481 } else { | |
| 5482 status = os::Linux::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
| 5483 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 5484 pthread_cond_destroy (_cond) ; | |
| 5485 pthread_cond_init (_cond, NULL); | |
| 5486 } | |
| 5487 } | |
| 5488 assert_status(status == 0 || status == EINTR || | |
| 5489 status == ETIME || status == ETIMEDOUT, | |
| 5490 status, "cond_timedwait"); | |
| 5491 | |
| 5492 #ifdef ASSERT | |
| 5493 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 5494 #endif | |
| 5495 | |
| 5496 _counter = 0 ; | |
| 5497 status = pthread_mutex_unlock(_mutex) ; | |
| 5498 assert_status(status == 0, status, "invariant") ; | |
|
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|
5499 // Paranoia to ensure our locked and lock-free paths interact |
|
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diff
changeset
|
5500 // correctly with each other and Java-level accesses. |
|
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diff
changeset
|
5501 OrderAccess::fence(); |
|
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diff
changeset
|
5502 |
| 0 | 5503 // If externally suspended while waiting, re-suspend |
| 5504 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 5505 jt->java_suspend_self(); | |
| 5506 } | |
| 5507 } | |
| 5508 | |
| 5509 void Parker::unpark() { | |
| 5510 int s, status ; | |
| 5511 status = pthread_mutex_lock(_mutex); | |
| 5512 assert (status == 0, "invariant") ; | |
| 5513 s = _counter; | |
| 5514 _counter = 1; | |
| 5515 if (s < 1) { | |
| 5516 if (WorkAroundNPTLTimedWaitHang) { | |
| 5517 status = pthread_cond_signal (_cond) ; | |
| 5518 assert (status == 0, "invariant") ; | |
| 5519 status = pthread_mutex_unlock(_mutex); | |
| 5520 assert (status == 0, "invariant") ; | |
| 5521 } else { | |
| 5522 status = pthread_mutex_unlock(_mutex); | |
| 5523 assert (status == 0, "invariant") ; | |
| 5524 status = pthread_cond_signal (_cond) ; | |
| 5525 assert (status == 0, "invariant") ; | |
| 5526 } | |
| 5527 } else { | |
| 5528 pthread_mutex_unlock(_mutex); | |
| 5529 assert (status == 0, "invariant") ; | |
| 5530 } | |
| 5531 } | |
| 5532 | |
| 5533 | |
| 5534 extern char** environ; | |
| 5535 | |
| 5536 #ifndef __NR_fork | |
| 5537 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
| 5538 #endif | |
| 5539 | |
| 5540 #ifndef __NR_execve | |
| 5541 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
| 5542 #endif | |
| 5543 | |
| 5544 // Run the specified command in a separate process. Return its exit value, | |
| 5545 // or -1 on failure (e.g. can't fork a new process). | |
| 5546 // Unlike system(), this function can be called from signal handler. It | |
| 5547 // doesn't block SIGINT et al. | |
| 5548 int os::fork_and_exec(char* cmd) { | |
|
199
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xlu
parents:
141
diff
changeset
|
5549 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
| 0 | 5550 |
| 5551 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
| 5552 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 5553 // separate process to execve. Make a direct syscall to fork process. | |
| 5554 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 5555 // the best... | |
| 5556 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
| 5557 IA64_ONLY(fork();) | |
| 5558 | |
| 5559 if (pid < 0) { | |
| 5560 // fork failed | |
| 5561 return -1; | |
| 5562 | |
| 5563 } else if (pid == 0) { | |
| 5564 // child process | |
| 5565 | |
| 5566 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
| 5567 // first to kill every thread on the thread list. Because this list is | |
| 5568 // not reset by fork() (see notes above), execve() will instead kill | |
| 5569 // every thread in the parent process. We know this is the only thread | |
| 5570 // in the new process, so make a system call directly. | |
| 5571 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 5572 // above. | |
| 5573 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);) | |
|
199
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parents:
141
diff
changeset
|
5574 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
| 0 | 5575 |
| 5576 // execve failed | |
| 5577 _exit(-1); | |
| 5578 | |
| 5579 } else { | |
| 5580 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 5581 // care about the actual exit code, for now. | |
| 5582 | |
| 5583 int status; | |
| 5584 | |
| 5585 // Wait for the child process to exit. This returns immediately if | |
| 5586 // the child has already exited. */ | |
| 5587 while (waitpid(pid, &status, 0) < 0) { | |
| 5588 switch (errno) { | |
| 5589 case ECHILD: return 0; | |
| 5590 case EINTR: break; | |
| 5591 default: return -1; | |
| 5592 } | |
| 5593 } | |
| 5594 | |
| 5595 if (WIFEXITED(status)) { | |
| 5596 // The child exited normally; get its exit code. | |
| 5597 return WEXITSTATUS(status); | |
| 5598 } else if (WIFSIGNALED(status)) { | |
| 5599 // The child exited because of a signal | |
| 5600 // The best value to return is 0x80 + signal number, | |
| 5601 // because that is what all Unix shells do, and because | |
| 5602 // it allows callers to distinguish between process exit and | |
| 5603 // process death by signal. | |
| 5604 return 0x80 + WTERMSIG(status); | |
| 5605 } else { | |
| 5606 // Unknown exit code; pass it through | |
| 5607 return status; | |
| 5608 } | |
| 5609 } | |
| 5610 } | |
|
1681
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changeset
|
5611 |
|
126ea7725993
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diff
changeset
|
5612 // is_headless_jre() |
|
126ea7725993
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changeset
|
5613 // |
|
4082
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|
5614 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
|
1681
126ea7725993
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diff
changeset
|
5615 // in order to report if we are running in a headless jre |
|
126ea7725993
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diff
changeset
|
5616 // |
|
4082
36b057451829
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4006
diff
changeset
|
5617 // Since JDK8 xawt/libmawt.so was moved into the same directory |
|
36b057451829
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diff
changeset
|
5618 // as libawt.so, and renamed libawt_xawt.so |
|
36b057451829
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dholmes
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4006
diff
changeset
|
5619 // |
|
1681
126ea7725993
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diff
changeset
|
5620 bool os::is_headless_jre() { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1642
diff
changeset
|
5621 struct stat statbuf; |
|
126ea7725993
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1642
diff
changeset
|
5622 char buf[MAXPATHLEN]; |
|
126ea7725993
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diff
changeset
|
5623 char libmawtpath[MAXPATHLEN]; |
|
126ea7725993
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diff
changeset
|
5624 const char *xawtstr = "/xawt/libmawt.so"; |
|
4082
36b057451829
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4006
diff
changeset
|
5625 const char *new_xawtstr = "/libawt_xawt.so"; |
|
1681
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changeset
|
5626 char *p; |
|
126ea7725993
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diff
changeset
|
5627 |
|
126ea7725993
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diff
changeset
|
5628 // Get path to libjvm.so |
|
126ea7725993
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diff
changeset
|
5629 os::jvm_path(buf, sizeof(buf)); |
|
126ea7725993
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diff
changeset
|
5630 |
|
126ea7725993
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diff
changeset
|
5631 // Get rid of libjvm.so |
|
126ea7725993
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diff
changeset
|
5632 p = strrchr(buf, '/'); |
|
126ea7725993
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diff
changeset
|
5633 if (p == NULL) return false; |
|
126ea7725993
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1642
diff
changeset
|
5634 else *p = '\0'; |
|
126ea7725993
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diff
changeset
|
5635 |
|
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diff
changeset
|
5636 // Get rid of client or server |
|
126ea7725993
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diff
changeset
|
5637 p = strrchr(buf, '/'); |
|
126ea7725993
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1642
diff
changeset
|
5638 if (p == NULL) return false; |
|
126ea7725993
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1642
diff
changeset
|
5639 else *p = '\0'; |
|
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diff
changeset
|
5640 |
|
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1642
diff
changeset
|
5641 // check xawt/libmawt.so |
|
126ea7725993
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diff
changeset
|
5642 strcpy(libmawtpath, buf); |
|
126ea7725993
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diff
changeset
|
5643 strcat(libmawtpath, xawtstr); |
|
126ea7725993
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diff
changeset
|
5644 if (::stat(libmawtpath, &statbuf) == 0) return false; |
|
126ea7725993
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diff
changeset
|
5645 |
|
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diff
changeset
|
5646 // check libawt_xawt.so |
|
1681
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changeset
|
5647 strcpy(libmawtpath, buf); |
|
4082
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4006
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changeset
|
5648 strcat(libmawtpath, new_xawtstr); |
|
1681
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diff
changeset
|
5649 if (::stat(libmawtpath, &statbuf) == 0) return false; |
|
126ea7725993
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diff
changeset
|
5650 |
|
126ea7725993
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diff
changeset
|
5651 return true; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5652 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5653 |
|
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5654 // Get the default path to the core file |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5655 // Returns the length of the string |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5656 int os::get_core_path(char* buffer, size_t bufferSize) { |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5657 const char* p = get_current_directory(buffer, bufferSize); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5658 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5659 if (p == NULL) { |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5660 assert(p != NULL, "failed to get current directory"); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5661 return 0; |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5662 } |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5663 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5664 return strlen(buffer); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5665 } |
|
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5666 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5667 #ifdef JAVASE_EMBEDDED |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5668 // |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5669 // A thread to watch the '/dev/mem_notify' device, which will tell us when the OS is running low on memory. |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5670 // |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5671 MemNotifyThread* MemNotifyThread::_memnotify_thread = NULL; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5672 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5673 // ctor |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5674 // |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5675 MemNotifyThread::MemNotifyThread(int fd): Thread() { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5676 assert(memnotify_thread() == NULL, "we can only allocate one MemNotifyThread"); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5677 _fd = fd; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5678 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5679 if (os::create_thread(this, os::os_thread)) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5680 _memnotify_thread = this; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5681 os::set_priority(this, NearMaxPriority); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5682 os::start_thread(this); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5683 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5684 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5685 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5686 // Where all the work gets done |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5687 // |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5688 void MemNotifyThread::run() { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5689 assert(this == memnotify_thread(), "expected the singleton MemNotifyThread"); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5690 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5691 // Set up the select arguments |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5692 fd_set rfds; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5693 if (_fd != -1) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5694 FD_ZERO(&rfds); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5695 FD_SET(_fd, &rfds); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5696 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5697 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5698 // Now wait for the mem_notify device to wake up |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5699 while (1) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5700 // Wait for the mem_notify device to signal us.. |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5701 int rc = select(_fd+1, _fd != -1 ? &rfds : NULL, NULL, NULL, NULL); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5702 if (rc == -1) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5703 perror("select!\n"); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5704 break; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5705 } else if (rc) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5706 //ssize_t free_before = os::available_memory(); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5707 //tty->print ("Notified: Free: %dK \n",os::available_memory()/1024); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5708 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5709 // The kernel is telling us there is not much memory left... |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5710 // try to do something about that |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5711 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5712 // If we are not already in a GC, try one. |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5713 if (!Universe::heap()->is_gc_active()) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5714 Universe::heap()->collect(GCCause::_allocation_failure); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5715 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5716 //ssize_t free_after = os::available_memory(); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5717 //tty->print ("Post-Notify: Free: %dK\n",free_after/1024); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5718 //tty->print ("GC freed: %dK\n", (free_after - free_before)/1024); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5719 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5720 // We might want to do something like the following if we find the GC's are not helping... |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5721 // Universe::heap()->size_policy()->set_gc_time_limit_exceeded(true); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5722 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5723 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5724 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5725 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5726 // |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5727 // See if the /dev/mem_notify device exists, and if so, start a thread to monitor it. |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5728 // |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5729 void MemNotifyThread::start() { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5730 int fd; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5731 fd = open ("/dev/mem_notify", O_RDONLY, 0); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5732 if (fd < 0) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5733 return; |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5734 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5735 |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5736 if (memnotify_thread() == NULL) { |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5737 new MemNotifyThread(fd); |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5738 } |
|
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5739 } |
| 10405 | 5740 |
|
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5741 #endif // JAVASE_EMBEDDED |