Mercurial > hg > graal-compiler
annotate src/os/bsd/vm/os_bsd.cpp @ 14460:8a9bb7821e28
Merge
| author | kvn |
|---|---|
| date | Wed, 19 Feb 2014 12:08:49 -0800 |
| parents | b59507f713e0 2b8e28fdf503 |
| children | 28f281e8de1d |
| rev | line source |
|---|---|
| 3960 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| 3960 | 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 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 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" |
| 3960 | 33 #include "interpreter/interpreter.hpp" |
| 34 #include "jvm_bsd.h" | |
| 35 #include "memory/allocation.inline.hpp" | |
| 36 #include "memory/filemap.hpp" | |
| 37 #include "mutex_bsd.inline.hpp" | |
| 38 #include "oops/oop.inline.hpp" | |
| 39 #include "os_share_bsd.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" | |
| 47 #include "runtime/java.hpp" | |
| 48 #include "runtime/javaCalls.hpp" | |
| 49 #include "runtime/mutexLocker.hpp" | |
| 50 #include "runtime/objectMonitor.hpp" | |
| 51 #include "runtime/osThread.hpp" | |
| 52 #include "runtime/perfMemory.hpp" | |
| 53 #include "runtime/sharedRuntime.hpp" | |
| 54 #include "runtime/statSampler.hpp" | |
| 55 #include "runtime/stubRoutines.hpp" | |
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56 #include "runtime/thread.inline.hpp" |
| 3960 | 57 #include "runtime/threadCritical.hpp" |
| 58 #include "runtime/timer.hpp" | |
| 59 #include "services/attachListener.hpp" | |
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60 #include "services/memTracker.hpp" |
| 3960 | 61 #include "services/runtimeService.hpp" |
| 62 #include "utilities/decoder.hpp" | |
| 63 #include "utilities/defaultStream.hpp" | |
| 64 #include "utilities/events.hpp" | |
| 65 #include "utilities/growableArray.hpp" | |
| 66 #include "utilities/vmError.hpp" | |
| 67 | |
| 68 // put OS-includes here | |
| 69 # include <sys/types.h> | |
| 70 # include <sys/mman.h> | |
| 71 # include <sys/stat.h> | |
| 72 # include <sys/select.h> | |
| 73 # include <pthread.h> | |
| 74 # include <signal.h> | |
| 75 # include <errno.h> | |
| 76 # include <dlfcn.h> | |
| 77 # include <stdio.h> | |
| 78 # include <unistd.h> | |
| 79 # include <sys/resource.h> | |
| 80 # include <pthread.h> | |
| 81 # include <sys/stat.h> | |
| 82 # include <sys/time.h> | |
| 83 # include <sys/times.h> | |
| 84 # include <sys/utsname.h> | |
| 85 # include <sys/socket.h> | |
| 86 # include <sys/wait.h> | |
| 87 # include <time.h> | |
| 88 # include <pwd.h> | |
| 89 # include <poll.h> | |
| 90 # include <semaphore.h> | |
| 91 # include <fcntl.h> | |
| 92 # include <string.h> | |
| 93 # include <sys/param.h> | |
| 94 # include <sys/sysctl.h> | |
| 95 # include <sys/ipc.h> | |
| 96 # include <sys/shm.h> | |
| 97 #ifndef __APPLE__ | |
| 98 # include <link.h> | |
| 99 #endif | |
| 100 # include <stdint.h> | |
| 101 # include <inttypes.h> | |
| 102 # include <sys/ioctl.h> | |
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103 # include <sys/syscall.h> |
| 3960 | 104 |
| 105 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
| 106 # include <elf.h> | |
| 107 #endif | |
| 108 | |
| 109 #ifdef __APPLE__ | |
| 4006 | 110 # include <mach/mach.h> // semaphore_* API |
| 111 # include <mach-o/dyld.h> | |
| 112 # include <sys/proc_info.h> | |
| 113 # include <objc/objc-auto.h> | |
| 3960 | 114 #endif |
| 115 | |
| 116 #ifndef MAP_ANONYMOUS | |
| 117 #define MAP_ANONYMOUS MAP_ANON | |
| 118 #endif | |
| 119 | |
| 120 #define MAX_PATH (2 * K) | |
| 121 | |
| 122 // for timer info max values which include all bits | |
| 123 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
| 124 | |
| 125 #define LARGEPAGES_BIT (1 << 6) | |
| 126 //////////////////////////////////////////////////////////////////////////////// | |
| 127 // global variables | |
| 128 julong os::Bsd::_physical_memory = 0; | |
| 129 | |
| 130 | |
| 131 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
| 132 pthread_t os::Bsd::_main_thread; | |
| 133 int os::Bsd::_page_size = -1; | |
| 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; | |
| 6918 | 141 static bool check_signals = true; |
| 3960 | 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 | |
| 151 | |
| 152 //////////////////////////////////////////////////////////////////////////////// | |
| 153 // utility functions | |
| 154 | |
| 155 static int SR_initialize(); | |
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156 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); |
| 3960 | 157 |
| 158 julong os::available_memory() { | |
| 159 return Bsd::available_memory(); | |
| 160 } | |
| 161 | |
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162 // available here means free |
| 3960 | 163 julong os::Bsd::available_memory() { |
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164 uint64_t available = physical_memory() >> 2; |
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165 #ifdef __APPLE__ |
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166 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; |
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167 vm_statistics64_data_t vmstat; |
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168 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, |
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169 (host_info64_t)&vmstat, &count); |
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170 assert(kerr == KERN_SUCCESS, |
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171 "host_statistics64 failed - check mach_host_self() and count"); |
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172 if (kerr == KERN_SUCCESS) { |
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173 available = vmstat.free_count * os::vm_page_size(); |
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174 } |
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175 #endif |
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176 return available; |
| 3960 | 177 } |
| 178 | |
| 179 julong os::physical_memory() { | |
| 180 return Bsd::physical_memory(); | |
| 181 } | |
| 182 | |
| 183 //////////////////////////////////////////////////////////////////////////////// | |
| 184 // environment support | |
| 185 | |
| 186 bool os::getenv(const char* name, char* buf, int len) { | |
| 187 const char* val = ::getenv(name); | |
| 188 if (val != NULL && strlen(val) < (size_t)len) { | |
| 189 strcpy(buf, val); | |
| 190 return true; | |
| 191 } | |
| 192 if (len > 0) buf[0] = 0; // return a null string | |
| 193 return false; | |
| 194 } | |
| 195 | |
| 196 | |
| 197 // Return true if user is running as root. | |
| 198 | |
| 199 bool os::have_special_privileges() { | |
| 200 static bool init = false; | |
| 201 static bool privileges = false; | |
| 202 if (!init) { | |
| 203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
| 204 init = true; | |
| 205 } | |
| 206 return privileges; | |
| 207 } | |
| 208 | |
| 209 | |
| 210 | |
| 211 // Cpu architecture string | |
| 212 #if defined(ZERO) | |
| 213 static char cpu_arch[] = ZERO_LIBARCH; | |
| 214 #elif defined(IA64) | |
| 215 static char cpu_arch[] = "ia64"; | |
| 216 #elif defined(IA32) | |
| 217 static char cpu_arch[] = "i386"; | |
| 218 #elif defined(AMD64) | |
| 219 static char cpu_arch[] = "amd64"; | |
| 220 #elif defined(ARM) | |
| 221 static char cpu_arch[] = "arm"; | |
| 14390 | 222 #elif defined(PPC32) |
| 3960 | 223 static char cpu_arch[] = "ppc"; |
| 224 #elif defined(SPARC) | |
| 225 # ifdef _LP64 | |
| 226 static char cpu_arch[] = "sparcv9"; | |
| 227 # else | |
| 228 static char cpu_arch[] = "sparc"; | |
| 229 # endif | |
| 230 #else | |
| 231 #error Add appropriate cpu_arch setting | |
| 232 #endif | |
| 233 | |
| 4846 | 234 // Compiler variant |
| 235 #ifdef COMPILER2 | |
| 236 #define COMPILER_VARIANT "server" | |
| 237 #else | |
| 238 #define COMPILER_VARIANT "client" | |
| 239 #endif | |
| 3960 | 240 |
| 6918 | 241 |
| 3960 | 242 void os::Bsd::initialize_system_info() { |
| 243 int mib[2]; | |
| 244 size_t len; | |
| 245 int cpu_val; | |
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246 julong mem_val; |
| 3960 | 247 |
| 248 /* get processors count via hw.ncpus sysctl */ | |
| 249 mib[0] = CTL_HW; | |
| 250 mib[1] = HW_NCPU; | |
| 251 len = sizeof(cpu_val); | |
| 252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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253 assert(len == sizeof(cpu_val), "unexpected data size"); |
| 3960 | 254 set_processor_count(cpu_val); |
| 255 } | |
| 256 else { | |
| 257 set_processor_count(1); // fallback | |
| 258 } | |
| 259 | |
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260 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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261 * since it returns a 64 bit value) |
| 3960 | 262 */ |
| 263 mib[0] = CTL_HW; | |
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264 |
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265 #if defined (HW_MEMSIZE) // Apple |
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266 mib[1] = HW_MEMSIZE; |
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267 #elif defined(HW_PHYSMEM) // Most of BSD |
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268 mib[1] = HW_PHYSMEM; |
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269 #elif defined(HW_REALMEM) // Old FreeBSD |
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270 mib[1] = HW_REALMEM; |
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271 #else |
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272 #error No ways to get physmem |
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273 #endif |
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274 |
| 3960 | 275 len = sizeof(mem_val); |
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276 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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277 assert(len == sizeof(mem_val), "unexpected data size"); |
| 3960 | 278 _physical_memory = mem_val; |
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279 } else { |
| 3960 | 280 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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281 } |
| 3960 | 282 |
| 283 #ifdef __OpenBSD__ | |
| 284 { | |
| 285 // limit _physical_memory memory view on OpenBSD since | |
| 286 // datasize rlimit restricts us anyway. | |
| 287 struct rlimit limits; | |
| 288 getrlimit(RLIMIT_DATA, &limits); | |
| 289 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
| 290 } | |
| 291 #endif | |
| 292 } | |
| 293 | |
| 4006 | 294 #ifdef __APPLE__ |
| 295 static const char *get_home() { | |
| 296 const char *home_dir = ::getenv("HOME"); | |
| 297 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
| 298 struct passwd *passwd_info = getpwuid(geteuid()); | |
| 299 if (passwd_info != NULL) { | |
| 300 home_dir = passwd_info->pw_dir; | |
| 301 } | |
| 302 } | |
| 303 | |
| 304 return home_dir; | |
| 305 } | |
| 306 #endif | |
| 307 | |
| 3960 | 308 void os::init_system_properties_values() { |
| 309 // char arch[12]; | |
| 310 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
| 311 | |
| 312 // The next steps are taken in the product version: | |
| 313 // | |
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314 // Obtain the JAVA_HOME value from the location of libjvm.so. |
| 3960 | 315 // This library should be located at: |
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316 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
| 3960 | 317 // |
| 318 // If "/jre/lib/" appears at the right place in the path, then we | |
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319 // assume libjvm.so is installed in a JDK and we use this path. |
| 3960 | 320 // |
| 321 // Otherwise exit with message: "Could not create the Java virtual machine." | |
| 322 // | |
| 323 // The following extra steps are taken in the debugging version: | |
| 324 // | |
| 325 // If "/jre/lib/" does NOT appear at the right place in the path | |
| 326 // instead of exit check for $JAVA_HOME environment variable. | |
| 327 // | |
| 328 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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329 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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330 // it looks like libjvm.so is installed there |
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331 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
| 3960 | 332 // |
| 333 // Otherwise exit. | |
| 334 // | |
| 335 // Important note: if the location of libjvm.so changes this | |
| 336 // code needs to be changed accordingly. | |
| 337 | |
| 338 // The next few definitions allow the code to be verbatim: | |
| 6197 | 339 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
| 3960 | 340 #define getenv(n) ::getenv(n) |
| 341 | |
| 342 /* | |
| 343 * See ld(1): | |
| 344 * The linker uses the following search paths to locate required | |
| 345 * shared libraries: | |
| 346 * 1: ... | |
| 347 * ... | |
| 348 * 7: The default directories, normally /lib and /usr/lib. | |
| 349 */ | |
| 350 #ifndef DEFAULT_LIBPATH | |
| 351 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
| 352 #endif | |
| 353 | |
| 354 #define EXTENSIONS_DIR "/lib/ext" | |
| 355 #define ENDORSED_DIR "/lib/endorsed" | |
| 356 #define REG_DIR "/usr/java/packages" | |
| 357 | |
| 4006 | 358 #ifdef __APPLE__ |
| 359 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
| 360 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
| 361 const char *user_home_dir = get_home(); | |
| 362 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
| 363 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
| 364 sizeof(SYS_EXTENSIONS_DIRS); | |
| 365 #endif | |
| 366 | |
| 3960 | 367 { |
| 368 /* sysclasspath, java_home, dll_dir */ | |
| 369 { | |
| 370 char *home_path; | |
| 371 char *dll_path; | |
| 372 char *pslash; | |
| 373 char buf[MAXPATHLEN]; | |
| 374 os::jvm_path(buf, sizeof(buf)); | |
| 375 | |
| 376 // Found the full path to libjvm.so. | |
| 377 // Now cut the path to <java_home>/jre if we can. | |
| 378 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
| 379 pslash = strrchr(buf, '/'); | |
| 380 if (pslash != NULL) | |
| 381 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
| 382 dll_path = malloc(strlen(buf) + 1); | |
| 383 if (dll_path == NULL) | |
| 384 return; | |
| 385 strcpy(dll_path, buf); | |
| 386 Arguments::set_dll_dir(dll_path); | |
| 387 | |
| 388 if (pslash != NULL) { | |
| 389 pslash = strrchr(buf, '/'); | |
| 390 if (pslash != NULL) { | |
| 4006 | 391 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
| 392 #ifndef __APPLE__ | |
| 3960 | 393 pslash = strrchr(buf, '/'); |
| 394 if (pslash != NULL) | |
| 395 *pslash = '\0'; /* get rid of /lib */ | |
| 4006 | 396 #endif |
| 3960 | 397 } |
| 398 } | |
| 399 | |
| 400 home_path = malloc(strlen(buf) + 1); | |
| 401 if (home_path == NULL) | |
| 402 return; | |
| 403 strcpy(home_path, buf); | |
| 404 Arguments::set_java_home(home_path); | |
| 405 | |
| 406 if (!set_boot_path('/', ':')) | |
| 407 return; | |
| 408 } | |
| 409 | |
| 410 /* | |
| 411 * Where to look for native libraries | |
| 412 * | |
| 413 * Note: Due to a legacy implementation, most of the library path | |
| 414 * is set in the launcher. This was to accomodate linking restrictions | |
| 415 * on legacy Bsd implementations (which are no longer supported). | |
| 416 * Eventually, all the library path setting will be done here. | |
| 417 * | |
| 418 * However, to prevent the proliferation of improperly built native | |
| 419 * libraries, the new path component /usr/java/packages is added here. | |
| 420 * Eventually, all the library path setting will be done here. | |
| 421 */ | |
| 422 { | |
| 423 char *ld_library_path; | |
| 424 | |
| 425 /* | |
| 426 * Construct the invariant part of ld_library_path. Note that the | |
| 427 * space for the colon and the trailing null are provided by the | |
| 428 * nulls included by the sizeof operator (so actually we allocate | |
| 429 * a byte more than necessary). | |
| 430 */ | |
| 4006 | 431 #ifdef __APPLE__ |
| 432 ld_library_path = (char *) malloc(system_ext_size); | |
| 433 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
| 434 #else | |
| 3960 | 435 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
| 436 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
| 437 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
| 4006 | 438 #endif |
| 3960 | 439 |
| 440 /* | |
| 441 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
| 442 * should always exist (until the legacy problem cited above is | |
| 443 * addressed). | |
| 444 */ | |
| 445 #ifdef __APPLE__ | |
| 4006 | 446 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
| 447 char *l = getenv("JAVA_LIBRARY_PATH"); | |
| 448 if (l != NULL) { | |
| 449 char *t = ld_library_path; | |
| 450 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 451 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
| 452 sprintf(ld_library_path, "%s:%s", l, t); | |
| 453 free(t); | |
| 454 } | |
| 455 | |
| 3960 | 456 char *v = getenv("DYLD_LIBRARY_PATH"); |
| 457 #else | |
| 458 char *v = getenv("LD_LIBRARY_PATH"); | |
| 459 #endif | |
| 460 if (v != NULL) { | |
| 461 char *t = ld_library_path; | |
| 462 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 463 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
| 464 sprintf(ld_library_path, "%s:%s", v, t); | |
| 4006 | 465 free(t); |
| 3960 | 466 } |
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467 |
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468 #ifdef __APPLE__ |
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469 // Apple's Java6 has "." at the beginning of java.library.path. |
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470 // OpenJDK on Windows has "." at the end of java.library.path. |
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471 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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472 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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473 // "." is appended to the end of java.library.path. Yes, this |
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474 // could cause a change in behavior, but Apple's Java6 behavior |
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475 // can be achieved by putting "." at the beginning of the |
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476 // JAVA_LIBRARY_PATH environment variable. |
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477 { |
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478 char *t = ld_library_path; |
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479 // that's +3 for appending ":." and the trailing '\0' |
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480 ld_library_path = (char *) malloc(strlen(t) + 3); |
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481 sprintf(ld_library_path, "%s:%s", t, "."); |
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482 free(t); |
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483 } |
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484 #endif |
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485 |
| 3960 | 486 Arguments::set_library_path(ld_library_path); |
| 487 } | |
| 488 | |
| 489 /* | |
| 490 * Extensions directories. | |
| 491 * | |
| 492 * Note that the space for the colon and the trailing null are provided | |
| 493 * by the nulls included by the sizeof operator (so actually one byte more | |
| 494 * than necessary is allocated). | |
| 495 */ | |
| 496 { | |
| 4006 | 497 #ifdef __APPLE__ |
| 498 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
| 499 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
| 500 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
| 501 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
| 502 #else | |
| 3960 | 503 char *buf = malloc(strlen(Arguments::get_java_home()) + |
| 504 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
| 505 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
| 506 Arguments::get_java_home()); | |
| 4006 | 507 #endif |
| 508 | |
| 3960 | 509 Arguments::set_ext_dirs(buf); |
| 510 } | |
| 511 | |
| 512 /* Endorsed standards default directory. */ | |
| 513 { | |
| 514 char * buf; | |
| 515 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
| 516 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
| 517 Arguments::set_endorsed_dirs(buf); | |
| 518 } | |
| 519 } | |
| 520 | |
| 4006 | 521 #ifdef __APPLE__ |
| 522 #undef SYS_EXTENSIONS_DIR | |
| 523 #endif | |
| 3960 | 524 #undef malloc |
| 525 #undef getenv | |
| 526 #undef EXTENSIONS_DIR | |
| 527 #undef ENDORSED_DIR | |
| 528 | |
| 529 // Done | |
| 530 return; | |
| 531 } | |
| 532 | |
| 533 //////////////////////////////////////////////////////////////////////////////// | |
| 534 // breakpoint support | |
| 535 | |
| 536 void os::breakpoint() { | |
| 537 BREAKPOINT; | |
| 538 } | |
| 539 | |
| 540 extern "C" void breakpoint() { | |
| 541 // use debugger to set breakpoint here | |
| 542 } | |
| 543 | |
| 544 //////////////////////////////////////////////////////////////////////////////// | |
| 545 // signal support | |
| 546 | |
| 547 debug_only(static bool signal_sets_initialized = false); | |
| 548 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
| 549 | |
| 550 bool os::Bsd::is_sig_ignored(int sig) { | |
| 551 struct sigaction oact; | |
| 552 sigaction(sig, (struct sigaction*)NULL, &oact); | |
| 553 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
| 554 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
| 555 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
| 556 return true; | |
| 557 else | |
| 558 return false; | |
| 559 } | |
| 560 | |
| 561 void os::Bsd::signal_sets_init() { | |
| 562 // Should also have an assertion stating we are still single-threaded. | |
| 563 assert(!signal_sets_initialized, "Already initialized"); | |
| 564 // Fill in signals that are necessarily unblocked for all threads in | |
| 565 // the VM. Currently, we unblock the following signals: | |
| 566 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
| 567 // by -Xrs (=ReduceSignalUsage)); | |
| 568 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
| 569 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
| 570 // the dispositions or masks wrt these signals. | |
| 571 // Programs embedding the VM that want to use the above signals for their | |
| 572 // own purposes must, at this time, use the "-Xrs" option to prevent | |
| 573 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
| 574 // (See bug 4345157, and other related bugs). | |
| 575 // In reality, though, unblocking these signals is really a nop, since | |
| 576 // these signals are not blocked by default. | |
| 577 sigemptyset(&unblocked_sigs); | |
| 578 sigemptyset(&allowdebug_blocked_sigs); | |
| 579 sigaddset(&unblocked_sigs, SIGILL); | |
| 580 sigaddset(&unblocked_sigs, SIGSEGV); | |
| 581 sigaddset(&unblocked_sigs, SIGBUS); | |
| 582 sigaddset(&unblocked_sigs, SIGFPE); | |
| 583 sigaddset(&unblocked_sigs, SR_signum); | |
| 584 | |
| 585 if (!ReduceSignalUsage) { | |
| 586 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
| 587 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
| 588 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
| 589 } | |
| 590 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
| 591 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
| 592 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
| 593 } | |
| 594 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
| 595 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
| 596 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
| 597 } | |
| 598 } | |
| 599 // Fill in signals that are blocked by all but the VM thread. | |
| 600 sigemptyset(&vm_sigs); | |
| 601 if (!ReduceSignalUsage) | |
| 602 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
| 603 debug_only(signal_sets_initialized = true); | |
| 604 | |
| 605 } | |
| 606 | |
| 607 // These are signals that are unblocked while a thread is running Java. | |
| 608 // (For some reason, they get blocked by default.) | |
| 609 sigset_t* os::Bsd::unblocked_signals() { | |
| 610 assert(signal_sets_initialized, "Not initialized"); | |
| 611 return &unblocked_sigs; | |
| 612 } | |
| 613 | |
| 614 // These are the signals that are blocked while a (non-VM) thread is | |
| 615 // running Java. Only the VM thread handles these signals. | |
| 616 sigset_t* os::Bsd::vm_signals() { | |
| 617 assert(signal_sets_initialized, "Not initialized"); | |
| 618 return &vm_sigs; | |
| 619 } | |
| 620 | |
| 621 // These are signals that are blocked during cond_wait to allow debugger in | |
| 622 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
| 623 assert(signal_sets_initialized, "Not initialized"); | |
| 624 return &allowdebug_blocked_sigs; | |
| 625 } | |
| 626 | |
| 627 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
| 628 | |
| 629 //Save caller's signal mask before setting VM signal mask | |
| 630 sigset_t caller_sigmask; | |
| 631 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
| 632 | |
| 633 OSThread* osthread = thread->osthread(); | |
| 634 osthread->set_caller_sigmask(caller_sigmask); | |
| 635 | |
| 636 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
| 637 | |
| 638 if (!ReduceSignalUsage) { | |
| 639 if (thread->is_VM_thread()) { | |
| 640 // Only the VM thread handles BREAK_SIGNAL ... | |
| 641 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
| 642 } else { | |
| 643 // ... all other threads block BREAK_SIGNAL | |
| 644 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
| 645 } | |
| 646 } | |
| 647 } | |
| 648 | |
| 649 | |
| 650 ////////////////////////////////////////////////////////////////////////////// | |
| 651 // create new thread | |
| 652 | |
| 653 // check if it's safe to start a new thread | |
| 654 static bool _thread_safety_check(Thread* thread) { | |
| 6918 | 655 return true; |
| 3960 | 656 } |
| 657 | |
| 4006 | 658 #ifdef __APPLE__ |
| 659 // library handle for calling objc_registerThreadWithCollector() | |
| 660 // without static linking to the libobjc library | |
| 661 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
| 662 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
| 663 typedef void (*objc_registerThreadWithCollector_t)(); | |
| 664 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
| 665 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
| 666 #endif | |
| 667 | |
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668 #ifdef __APPLE__ |
| 12095 | 669 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { |
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670 // Additional thread_id used to correlate threads in SA |
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671 thread_identifier_info_data_t m_ident_info; |
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672 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
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673 |
| 12095 | 674 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, |
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675 (thread_info_t) &m_ident_info, &count); |
| 12095 | 676 |
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677 return m_ident_info.thread_id; |
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678 } |
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679 #endif |
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680 |
| 3960 | 681 // Thread start routine for all newly created threads |
| 682 static void *java_start(Thread *thread) { | |
| 683 // Try to randomize the cache line index of hot stack frames. | |
| 684 // This helps when threads of the same stack traces evict each other's | |
| 685 // cache lines. The threads can be either from the same JVM instance, or | |
| 686 // from different JVM instances. The benefit is especially true for | |
| 687 // processors with hyperthreading technology. | |
| 688 static int counter = 0; | |
| 689 int pid = os::current_process_id(); | |
| 690 alloca(((pid ^ counter++) & 7) * 128); | |
| 691 | |
| 692 ThreadLocalStorage::set_thread(thread); | |
| 693 | |
| 694 OSThread* osthread = thread->osthread(); | |
| 695 Monitor* sync = osthread->startThread_lock(); | |
| 696 | |
| 697 // non floating stack BsdThreads needs extra check, see above | |
| 698 if (!_thread_safety_check(thread)) { | |
| 699 // notify parent thread | |
| 700 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 701 osthread->set_state(ZOMBIE); | |
| 702 sync->notify_all(); | |
| 703 return NULL; | |
| 704 } | |
| 705 | |
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706 osthread->set_thread_id(os::Bsd::gettid()); |
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707 |
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708 #ifdef __APPLE__ |
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709 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
| 12095 | 710 guarantee(unique_thread_id != 0, "unique thread id was not found"); |
| 711 osthread->set_unique_thread_id(unique_thread_id); | |
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712 #endif |
| 3960 | 713 // initialize signal mask for this thread |
| 714 os::Bsd::hotspot_sigmask(thread); | |
| 715 | |
| 716 // initialize floating point control register | |
| 717 os::Bsd::init_thread_fpu_state(); | |
| 718 | |
| 4006 | 719 #ifdef __APPLE__ |
| 720 // register thread with objc gc | |
| 721 if (objc_registerThreadWithCollectorFunction != NULL) { | |
| 722 objc_registerThreadWithCollectorFunction(); | |
| 723 } | |
| 724 #endif | |
| 725 | |
| 3960 | 726 // handshaking with parent thread |
| 727 { | |
| 728 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 729 | |
| 730 // notify parent thread | |
| 731 osthread->set_state(INITIALIZED); | |
| 732 sync->notify_all(); | |
| 733 | |
| 734 // wait until os::start_thread() | |
| 735 while (osthread->get_state() == INITIALIZED) { | |
| 736 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 737 } | |
| 738 } | |
| 739 | |
| 740 // call one more level start routine | |
| 741 thread->run(); | |
| 742 | |
| 743 return 0; | |
| 744 } | |
| 745 | |
| 746 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 747 assert(thread->osthread() == NULL, "caller responsible"); | |
| 748 | |
| 749 // Allocate the OSThread object | |
| 750 OSThread* osthread = new OSThread(NULL, NULL); | |
| 751 if (osthread == NULL) { | |
| 752 return false; | |
| 753 } | |
| 754 | |
| 755 // set the correct thread state | |
| 756 osthread->set_thread_type(thr_type); | |
| 757 | |
| 758 // Initial state is ALLOCATED but not INITIALIZED | |
| 759 osthread->set_state(ALLOCATED); | |
| 760 | |
| 761 thread->set_osthread(osthread); | |
| 762 | |
| 763 // init thread attributes | |
| 764 pthread_attr_t attr; | |
| 765 pthread_attr_init(&attr); | |
| 766 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 767 | |
| 768 // stack size | |
| 769 if (os::Bsd::supports_variable_stack_size()) { | |
| 770 // calculate stack size if it's not specified by caller | |
| 771 if (stack_size == 0) { | |
| 772 stack_size = os::Bsd::default_stack_size(thr_type); | |
| 773 | |
| 774 switch (thr_type) { | |
| 775 case os::java_thread: | |
| 776 // Java threads use ThreadStackSize which default value can be | |
| 777 // changed with the flag -Xss | |
| 778 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
| 779 stack_size = JavaThread::stack_size_at_create(); | |
| 780 break; | |
| 781 case os::compiler_thread: | |
| 782 if (CompilerThreadStackSize > 0) { | |
| 783 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 784 break; | |
| 785 } // else fall through: | |
| 786 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 787 case os::vm_thread: | |
| 788 case os::pgc_thread: | |
| 789 case os::cgc_thread: | |
| 790 case os::watcher_thread: | |
| 791 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 792 break; | |
| 793 } | |
| 794 } | |
| 795 | |
| 796 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
| 797 pthread_attr_setstacksize(&attr, stack_size); | |
| 798 } else { | |
| 799 // let pthread_create() pick the default value. | |
| 800 } | |
| 801 | |
| 802 ThreadState state; | |
| 803 | |
| 804 { | |
| 805 pthread_t tid; | |
| 806 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 807 | |
| 808 pthread_attr_destroy(&attr); | |
| 809 | |
| 810 if (ret != 0) { | |
| 811 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 812 perror("pthread_create()"); | |
| 813 } | |
| 814 // Need to clean up stuff we've allocated so far | |
| 815 thread->set_osthread(NULL); | |
| 816 delete osthread; | |
| 817 return false; | |
| 818 } | |
| 819 | |
| 820 // Store pthread info into the OSThread | |
| 821 osthread->set_pthread_id(tid); | |
| 822 | |
| 823 // Wait until child thread is either initialized or aborted | |
| 824 { | |
| 825 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 826 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 827 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 828 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 829 } | |
| 830 } | |
| 831 | |
| 832 } | |
| 833 | |
| 834 // Aborted due to thread limit being reached | |
| 835 if (state == ZOMBIE) { | |
| 836 thread->set_osthread(NULL); | |
| 837 delete osthread; | |
| 838 return false; | |
| 839 } | |
| 840 | |
| 841 // The thread is returned suspended (in state INITIALIZED), | |
| 842 // and is started higher up in the call chain | |
| 843 assert(state == INITIALIZED, "race condition"); | |
| 844 return true; | |
| 845 } | |
| 846 | |
| 847 ///////////////////////////////////////////////////////////////////////////// | |
| 848 // attach existing thread | |
| 849 | |
| 850 // bootstrap the main thread | |
| 851 bool os::create_main_thread(JavaThread* thread) { | |
| 852 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 853 return create_attached_thread(thread); | |
| 854 } | |
| 855 | |
| 856 bool os::create_attached_thread(JavaThread* thread) { | |
| 857 #ifdef ASSERT | |
| 858 thread->verify_not_published(); | |
| 859 #endif | |
| 860 | |
| 861 // Allocate the OSThread object | |
| 862 OSThread* osthread = new OSThread(NULL, NULL); | |
| 863 | |
| 864 if (osthread == NULL) { | |
| 865 return false; | |
| 866 } | |
| 867 | |
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868 osthread->set_thread_id(os::Bsd::gettid()); |
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869 |
| 3960 | 870 // Store pthread info into the OSThread |
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871 #ifdef __APPLE__ |
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872 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
| 12095 | 873 guarantee(unique_thread_id != 0, "just checking"); |
| 874 osthread->set_unique_thread_id(unique_thread_id); | |
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875 #endif |
| 3960 | 876 osthread->set_pthread_id(::pthread_self()); |
| 877 | |
| 878 // initialize floating point control register | |
| 879 os::Bsd::init_thread_fpu_state(); | |
| 880 | |
| 881 // Initial thread state is RUNNABLE | |
| 882 osthread->set_state(RUNNABLE); | |
| 883 | |
| 884 thread->set_osthread(osthread); | |
| 885 | |
| 886 // initialize signal mask for this thread | |
| 887 // and save the caller's signal mask | |
| 888 os::Bsd::hotspot_sigmask(thread); | |
| 889 | |
| 890 return true; | |
| 891 } | |
| 892 | |
| 893 void os::pd_start_thread(Thread* thread) { | |
| 894 OSThread * osthread = thread->osthread(); | |
| 895 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 896 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 897 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 898 sync_with_child->notify(); | |
| 899 } | |
| 900 | |
| 901 // Free Bsd resources related to the OSThread | |
| 902 void os::free_thread(OSThread* osthread) { | |
| 903 assert(osthread != NULL, "osthread not set"); | |
| 904 | |
| 905 if (Thread::current()->osthread() == osthread) { | |
| 906 // Restore caller's signal mask | |
| 907 sigset_t sigmask = osthread->caller_sigmask(); | |
| 908 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 909 } | |
| 910 | |
| 911 delete osthread; | |
| 912 } | |
| 913 | |
| 914 ////////////////////////////////////////////////////////////////////////////// | |
| 915 // thread local storage | |
| 916 | |
| 917 int os::allocate_thread_local_storage() { | |
| 918 pthread_key_t key; | |
| 919 int rslt = pthread_key_create(&key, NULL); | |
| 920 assert(rslt == 0, "cannot allocate thread local storage"); | |
| 921 return (int)key; | |
| 922 } | |
| 923 | |
| 924 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 925 // on VM exit. | |
| 926 void os::free_thread_local_storage(int index) { | |
| 927 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 928 assert(rslt == 0, "invalid index"); | |
| 929 } | |
| 930 | |
| 931 void os::thread_local_storage_at_put(int index, void* value) { | |
| 932 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 933 assert(rslt == 0, "pthread_setspecific failed"); | |
| 934 } | |
| 935 | |
| 936 extern "C" Thread* get_thread() { | |
| 937 return ThreadLocalStorage::thread(); | |
| 938 } | |
| 939 | |
| 940 | |
| 941 //////////////////////////////////////////////////////////////////////////////// | |
| 942 // time support | |
| 943 | |
| 944 // Time since start-up in seconds to a fine granularity. | |
| 945 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 946 double os::elapsedTime() { | |
| 947 | |
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948 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); |
| 3960 | 949 } |
| 950 | |
| 951 jlong os::elapsed_counter() { | |
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952 return javaTimeNanos() - initial_time_count; |
| 3960 | 953 } |
| 954 | |
| 955 jlong os::elapsed_frequency() { | |
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956 return NANOSECS_PER_SEC; // nanosecond resolution |
| 3960 | 957 } |
| 958 | |
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959 bool os::supports_vtime() { return true; } |
| 3960 | 960 bool os::enable_vtime() { return false; } |
| 961 bool os::vtime_enabled() { return false; } | |
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962 |
| 3960 | 963 double os::elapsedVTime() { |
| 964 // better than nothing, but not much | |
| 965 return elapsedTime(); | |
| 966 } | |
| 967 | |
| 968 jlong os::javaTimeMillis() { | |
| 969 timeval time; | |
| 970 int status = gettimeofday(&time, NULL); | |
| 971 assert(status != -1, "bsd error"); | |
| 972 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 973 } | |
| 974 | |
| 975 #ifndef CLOCK_MONOTONIC | |
| 976 #define CLOCK_MONOTONIC (1) | |
| 977 #endif | |
| 978 | |
| 979 #ifdef __APPLE__ | |
| 980 void os::Bsd::clock_init() { | |
| 981 // XXXDARWIN: Investigate replacement monotonic clock | |
| 982 } | |
| 6918 | 983 #else |
| 3960 | 984 void os::Bsd::clock_init() { |
| 985 struct timespec res; | |
| 986 struct timespec tp; | |
| 987 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
| 988 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
| 989 // yes, monotonic clock is supported | |
| 990 _clock_gettime = ::clock_gettime; | |
| 991 } | |
| 992 } | |
| 993 #endif | |
| 994 | |
| 995 | |
| 996 jlong os::javaTimeNanos() { | |
| 997 if (Bsd::supports_monotonic_clock()) { | |
| 998 struct timespec tp; | |
| 999 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 1000 assert(status == 0, "gettime error"); | |
| 1001 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 1002 return result; | |
| 1003 } else { | |
| 1004 timeval time; | |
| 1005 int status = gettimeofday(&time, NULL); | |
| 1006 assert(status != -1, "bsd error"); | |
| 1007 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 1008 return 1000 * usecs; | |
| 1009 } | |
| 1010 } | |
| 1011 | |
| 1012 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 1013 if (Bsd::supports_monotonic_clock()) { | |
| 1014 info_ptr->max_value = ALL_64_BITS; | |
| 1015 | |
| 1016 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 1017 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 1018 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 1019 } else { | |
| 1020 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 1021 info_ptr->max_value = ALL_64_BITS; | |
| 1022 | |
| 1023 // gettimeofday is a real time clock so it skips | |
| 1024 info_ptr->may_skip_backward = true; | |
| 1025 info_ptr->may_skip_forward = true; | |
| 1026 } | |
| 1027 | |
| 1028 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1029 } | |
| 1030 | |
| 1031 // Return the real, user, and system times in seconds from an | |
| 1032 // arbitrary fixed point in the past. | |
| 1033 bool os::getTimesSecs(double* process_real_time, | |
| 1034 double* process_user_time, | |
| 1035 double* process_system_time) { | |
| 1036 struct tms ticks; | |
| 1037 clock_t real_ticks = times(&ticks); | |
| 1038 | |
| 1039 if (real_ticks == (clock_t) (-1)) { | |
| 1040 return false; | |
| 1041 } else { | |
| 1042 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1043 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1044 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1045 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1046 | |
| 1047 return true; | |
| 1048 } | |
| 1049 } | |
| 1050 | |
| 1051 | |
| 1052 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1053 struct tm t; | |
| 1054 time_t long_time; | |
| 1055 time(&long_time); | |
| 1056 localtime_r(&long_time, &t); | |
| 1057 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1058 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1059 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1060 return buf; | |
| 1061 } | |
| 1062 | |
| 1063 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
| 1064 return localtime_r(clock, res); | |
| 1065 } | |
| 1066 | |
| 1067 //////////////////////////////////////////////////////////////////////////////// | |
| 1068 // runtime exit support | |
| 1069 | |
| 1070 // Note: os::shutdown() might be called very early during initialization, or | |
| 1071 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1072 // sure it is async-safe and can handle partially initialized VM. | |
| 1073 void os::shutdown() { | |
| 1074 | |
| 1075 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1076 perfMemory_exit(); | |
| 1077 | |
| 1078 // needs to remove object in file system | |
| 1079 AttachListener::abort(); | |
| 1080 | |
| 1081 // flush buffered output, finish log files | |
| 1082 ostream_abort(); | |
| 1083 | |
| 1084 // Check for abort hook | |
| 1085 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1086 if (abort_hook != NULL) { | |
| 1087 abort_hook(); | |
| 1088 } | |
| 1089 | |
| 1090 } | |
| 1091 | |
| 1092 // Note: os::abort() might be called very early during initialization, or | |
| 1093 // called from signal handler. Before adding something to os::abort(), make | |
| 1094 // sure it is async-safe and can handle partially initialized VM. | |
| 1095 void os::abort(bool dump_core) { | |
| 1096 os::shutdown(); | |
| 1097 if (dump_core) { | |
| 1098 #ifndef PRODUCT | |
| 1099 fdStream out(defaultStream::output_fd()); | |
| 1100 out.print_raw("Current thread is "); | |
| 1101 char buf[16]; | |
| 1102 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1103 out.print_raw_cr(buf); | |
| 1104 out.print_raw_cr("Dumping core ..."); | |
| 1105 #endif | |
| 1106 ::abort(); // dump core | |
| 1107 } | |
| 1108 | |
| 1109 ::exit(1); | |
| 1110 } | |
| 1111 | |
| 1112 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1113 void os::die() { | |
| 1114 // _exit() on BsdThreads only kills current thread | |
| 1115 ::abort(); | |
| 1116 } | |
| 1117 | |
| 1118 // unused on bsd for now. | |
| 1119 void os::set_error_file(const char *logfile) {} | |
| 1120 | |
| 1121 | |
| 1122 // This method is a copy of JDK's sysGetLastErrorString | |
| 1123 // from src/solaris/hpi/src/system_md.c | |
| 1124 | |
| 1125 size_t os::lasterror(char *buf, size_t len) { | |
| 1126 | |
| 1127 if (errno == 0) return 0; | |
| 1128 | |
| 1129 const char *s = ::strerror(errno); | |
| 1130 size_t n = ::strlen(s); | |
| 1131 if (n >= len) { | |
| 1132 n = len - 1; | |
| 1133 } | |
| 1134 ::strncpy(buf, s, n); | |
| 1135 buf[n] = '\0'; | |
| 1136 return n; | |
| 1137 } | |
| 1138 | |
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1139 // Information of current thread in variety of formats |
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1140 pid_t os::Bsd::gettid() { |
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1141 int retval = -1; |
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1142 |
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1143 #ifdef __APPLE__ //XNU kernel |
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1144 // despite the fact mach port is actually not a thread id use it |
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1145 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 |
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1146 retval = ::pthread_mach_thread_np(::pthread_self()); |
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1147 guarantee(retval != 0, "just checking"); |
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1148 return retval; |
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1149 |
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1150 #elif __FreeBSD__ |
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1151 retval = syscall(SYS_thr_self); |
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1152 #elif __OpenBSD__ |
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1153 retval = syscall(SYS_getthrid); |
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1154 #elif __NetBSD__ |
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1155 retval = (pid_t) syscall(SYS__lwp_self); |
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1156 #endif |
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1157 |
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1158 if (retval == -1) { |
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1159 return getpid(); |
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1160 } |
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1161 } |
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1162 |
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1163 intx os::current_thread_id() { |
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1164 #ifdef __APPLE__ |
| 12095 | 1165 return (intx)::pthread_mach_thread_np(::pthread_self()); |
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1166 #else |
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1167 return (intx)::pthread_self(); |
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1168 #endif |
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1169 } |
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1170 |
| 3960 | 1171 int os::current_process_id() { |
| 1172 | |
| 1173 // Under the old bsd thread library, bsd gives each thread | |
| 1174 // its own process id. Because of this each thread will return | |
| 1175 // a different pid if this method were to return the result | |
| 1176 // of getpid(2). Bsd provides no api that returns the pid | |
| 1177 // of the launcher thread for the vm. This implementation | |
| 1178 // returns a unique pid, the pid of the launcher thread | |
| 1179 // that starts the vm 'process'. | |
| 1180 | |
| 1181 // Under the NPTL, getpid() returns the same pid as the | |
| 1182 // launcher thread rather than a unique pid per thread. | |
| 1183 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1184 | |
| 1185 // if you are looking for the result of a call to getpid() that | |
| 1186 // returns a unique pid for the calling thread, then look at the | |
| 1187 // OSThread::thread_id() method in osThread_bsd.hpp file | |
| 1188 | |
| 1189 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1190 } | |
| 1191 | |
| 1192 // DLL functions | |
| 1193 | |
| 1194 #define JNI_LIB_PREFIX "lib" | |
| 1195 #ifdef __APPLE__ | |
| 1196 #define JNI_LIB_SUFFIX ".dylib" | |
| 1197 #else | |
| 1198 #define JNI_LIB_SUFFIX ".so" | |
| 1199 #endif | |
| 1200 | |
| 1201 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
| 1202 | |
| 1203 // This must be hard coded because it's the system's temporary | |
| 1204 // directory not the java application's temp directory, ala java.io.tmpdir. | |
| 4006 | 1205 #ifdef __APPLE__ |
| 1206 // macosx has a secure per-user temporary directory | |
| 1207 char temp_path_storage[PATH_MAX]; | |
| 1208 const char* os::get_temp_directory() { | |
| 1209 static char *temp_path = NULL; | |
| 1210 if (temp_path == NULL) { | |
| 1211 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
| 1212 if (pathSize == 0 || pathSize > PATH_MAX) { | |
| 1213 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
| 1214 } | |
| 1215 temp_path = temp_path_storage; | |
| 1216 } | |
| 1217 return temp_path; | |
| 1218 } | |
| 1219 #else /* __APPLE__ */ | |
| 3960 | 1220 const char* os::get_temp_directory() { return "/tmp"; } |
| 4006 | 1221 #endif /* __APPLE__ */ |
| 3960 | 1222 |
| 1223 static bool file_exists(const char* filename) { | |
| 1224 struct stat statbuf; | |
| 1225 if (filename == NULL || strlen(filename) == 0) { | |
| 1226 return false; | |
| 1227 } | |
| 1228 return os::stat(filename, &statbuf) == 0; | |
| 1229 } | |
| 1230 | |
|
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1231 bool os::dll_build_name(char* buffer, size_t buflen, |
| 3960 | 1232 const char* pname, const char* fname) { |
|
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1233 bool retval = false; |
| 3960 | 1234 // Copied from libhpi |
| 1235 const size_t pnamelen = pname ? strlen(pname) : 0; | |
| 1236 | |
|
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|
1237 // Return error on buffer overflow. |
| 3960 | 1238 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
|
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1239 return retval; |
| 3960 | 1240 } |
| 1241 | |
| 1242 if (pnamelen == 0) { | |
| 1243 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
|
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1244 retval = true; |
| 3960 | 1245 } else if (strchr(pname, *os::path_separator()) != NULL) { |
| 1246 int n; | |
| 1247 char** pelements = split_path(pname, &n); | |
|
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1248 if (pelements == NULL) { |
| 9062 | 1249 return false; |
|
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|
1250 } |
| 3960 | 1251 for (int i = 0 ; i < n ; i++) { |
| 1252 // Really shouldn't be NULL, but check can't hurt | |
| 1253 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1254 continue; // skip the empty path values | |
| 1255 } | |
| 1256 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
| 1257 pelements[i], fname); | |
| 1258 if (file_exists(buffer)) { | |
|
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|
1259 retval = true; |
| 3960 | 1260 break; |
| 1261 } | |
| 1262 } | |
| 1263 // release the storage | |
| 1264 for (int i = 0 ; i < n ; i++) { | |
| 1265 if (pelements[i] != NULL) { | |
| 6197 | 1266 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 3960 | 1267 } |
| 1268 } | |
| 1269 if (pelements != NULL) { | |
| 6197 | 1270 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 3960 | 1271 } |
| 1272 } else { | |
| 1273 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
|
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1274 retval = true; |
| 3960 | 1275 } |
|
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1276 return retval; |
| 3960 | 1277 } |
| 1278 | |
|
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1279 // check if addr is inside libjvm.so |
| 3960 | 1280 bool os::address_is_in_vm(address addr) { |
| 1281 static address libjvm_base_addr; | |
| 1282 Dl_info dlinfo; | |
| 1283 | |
| 1284 if (libjvm_base_addr == NULL) { | |
|
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1285 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
|
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1286 libjvm_base_addr = (address)dlinfo.dli_fbase; |
|
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1287 } |
| 3960 | 1288 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
| 1289 } | |
| 1290 | |
|
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1291 if (dladdr((void *)addr, &dlinfo) != 0) { |
| 3960 | 1292 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
| 1293 } | |
| 1294 | |
| 1295 return false; | |
| 1296 } | |
| 1297 | |
| 6258 | 1298 |
| 1299 #define MACH_MAXSYMLEN 256 | |
| 1300 | |
| 3960 | 1301 bool os::dll_address_to_function_name(address addr, char *buf, |
| 1302 int buflen, int *offset) { | |
|
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1303 // buf is not optional, but offset is optional |
|
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1304 assert(buf != NULL, "sanity check"); |
|
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1305 |
| 3960 | 1306 Dl_info dlinfo; |
| 6258 | 1307 char localbuf[MACH_MAXSYMLEN]; |
| 1308 | |
|
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1309 if (dladdr((void*)addr, &dlinfo) != 0) { |
|
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1310 // see if we have a matching symbol |
|
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1311 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
|
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1312 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
| 3960 | 1313 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
| 1314 } | |
|
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1315 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
|
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1316 return true; |
|
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1317 } |
|
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1318 // no matching symbol so try for just file info |
|
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1319 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
|
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1320 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
|
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1321 buf, buflen, offset, dlinfo.dli_fname)) { |
|
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1322 return true; |
|
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1323 } |
| 3960 | 1324 } |
|
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1325 |
|
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1326 // Handle non-dynamic manually: |
|
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1327 if (dlinfo.dli_fbase != NULL && |
|
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1328 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, |
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1329 dlinfo.dli_fbase)) { |
|
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1330 if (!Decoder::demangle(localbuf, buf, buflen)) { |
|
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1331 jio_snprintf(buf, buflen, "%s", localbuf); |
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1332 } |
|
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1333 return true; |
| 3960 | 1334 } |
| 1335 } | |
|
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1336 buf[0] = '\0'; |
| 3960 | 1337 if (offset != NULL) *offset = -1; |
| 1338 return false; | |
| 1339 } | |
| 1340 | |
| 1341 // ported from solaris version | |
| 1342 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1343 int buflen, int* offset) { | |
|
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1344 // buf is not optional, but offset is optional |
|
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1345 assert(buf != NULL, "sanity check"); |
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1346 |
| 3960 | 1347 Dl_info dlinfo; |
| 1348 | |
|
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1349 if (dladdr((void*)addr, &dlinfo) != 0) { |
|
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1350 if (dlinfo.dli_fname != NULL) { |
|
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1351 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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1352 } |
|
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1353 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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1354 *offset = addr - (address)dlinfo.dli_fbase; |
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1355 } |
|
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1356 return true; |
| 3960 | 1357 } |
|
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1358 |
|
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1359 buf[0] = '\0'; |
|
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1360 if (offset) *offset = -1; |
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1361 return false; |
| 3960 | 1362 } |
| 6918 | 1363 |
| 1364 // Loads .dll/.so and | |
| 1365 // in case of error it checks if .dll/.so was built for the | |
| 1366 // same architecture as Hotspot is running on | |
| 3960 | 1367 |
| 1368 #ifdef __APPLE__ | |
| 1369 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
| 1370 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1371 if (result != NULL) { | |
| 1372 // Successful loading | |
| 1373 return result; | |
| 1374 } | |
| 1375 | |
| 1376 // Read system error message into ebuf | |
| 1377 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1378 ebuf[ebuflen-1]='\0'; | |
| 1379 | |
| 1380 return NULL; | |
| 1381 } | |
| 1382 #else | |
| 1383 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
| 1384 { | |
| 1385 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1386 if (result != NULL) { | |
| 1387 // Successful loading | |
| 1388 return result; | |
| 1389 } | |
| 1390 | |
| 1391 Elf32_Ehdr elf_head; | |
| 1392 | |
| 1393 // Read system error message into ebuf | |
| 1394 // It may or may not be overwritten below | |
| 1395 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1396 ebuf[ebuflen-1]='\0'; | |
| 1397 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 1398 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 1399 | |
| 1400 if (diag_msg_max_length==0) { | |
| 1401 // No more space in ebuf for additional diagnostics message | |
| 1402 return NULL; | |
| 1403 } | |
| 1404 | |
| 1405 | |
| 1406 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 1407 | |
| 1408 if (file_descriptor < 0) { | |
| 1409 // Can't open library, report dlerror() message | |
| 1410 return NULL; | |
| 1411 } | |
| 1412 | |
| 1413 bool failed_to_read_elf_head= | |
| 1414 (sizeof(elf_head)!= | |
| 1415 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 1416 | |
| 1417 ::close(file_descriptor); | |
| 1418 if (failed_to_read_elf_head) { | |
| 1419 // file i/o error - report dlerror() msg | |
| 1420 return NULL; | |
| 1421 } | |
| 1422 | |
| 1423 typedef struct { | |
| 1424 Elf32_Half code; // Actual value as defined in elf.h | |
| 1425 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 1426 char elf_class; // 32 or 64 bit | |
| 1427 char endianess; // MSB or LSB | |
| 1428 char* name; // String representation | |
| 1429 } arch_t; | |
| 1430 | |
| 1431 #ifndef EM_486 | |
| 1432 #define EM_486 6 /* Intel 80486 */ | |
| 1433 #endif | |
| 1434 | |
| 1435 #ifndef EM_MIPS_RS3_LE | |
| 1436 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
| 1437 #endif | |
| 1438 | |
| 1439 #ifndef EM_PPC64 | |
| 1440 #define EM_PPC64 21 /* PowerPC64 */ | |
| 1441 #endif | |
| 1442 | |
| 1443 #ifndef EM_S390 | |
| 1444 #define EM_S390 22 /* IBM System/390 */ | |
| 1445 #endif | |
| 1446 | |
| 1447 #ifndef EM_IA_64 | |
| 1448 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
| 1449 #endif | |
| 1450 | |
| 1451 #ifndef EM_X86_64 | |
| 1452 #define EM_X86_64 62 /* AMD x86-64 */ | |
| 1453 #endif | |
| 1454 | |
| 1455 static const arch_t arch_array[]={ | |
| 1456 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1457 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1458 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 1459 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 1460 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1461 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1462 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 1463 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
| 1464 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
| 1465 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
| 1466 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 1467 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 1468 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 1469 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 1470 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 1471 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 1472 }; | |
| 1473 | |
| 1474 #if (defined IA32) | |
| 1475 static Elf32_Half running_arch_code=EM_386; | |
| 1476 #elif (defined AMD64) | |
| 1477 static Elf32_Half running_arch_code=EM_X86_64; | |
| 1478 #elif (defined IA64) | |
| 1479 static Elf32_Half running_arch_code=EM_IA_64; | |
| 1480 #elif (defined __sparc) && (defined _LP64) | |
| 1481 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 1482 #elif (defined __sparc) && (!defined _LP64) | |
| 1483 static Elf32_Half running_arch_code=EM_SPARC; | |
| 1484 #elif (defined __powerpc64__) | |
| 1485 static Elf32_Half running_arch_code=EM_PPC64; | |
| 1486 #elif (defined __powerpc__) | |
| 1487 static Elf32_Half running_arch_code=EM_PPC; | |
| 1488 #elif (defined ARM) | |
| 1489 static Elf32_Half running_arch_code=EM_ARM; | |
| 1490 #elif (defined S390) | |
| 1491 static Elf32_Half running_arch_code=EM_S390; | |
| 1492 #elif (defined ALPHA) | |
| 1493 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 1494 #elif (defined MIPSEL) | |
| 1495 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 1496 #elif (defined PARISC) | |
| 1497 static Elf32_Half running_arch_code=EM_PARISC; | |
| 1498 #elif (defined MIPS) | |
| 1499 static Elf32_Half running_arch_code=EM_MIPS; | |
| 1500 #elif (defined M68K) | |
| 1501 static Elf32_Half running_arch_code=EM_68K; | |
| 1502 #else | |
| 1503 #error Method os::dll_load requires that one of following is defined:\ | |
| 1504 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
| 1505 #endif | |
| 1506 | |
| 1507 // Identify compatability class for VM's architecture and library's architecture | |
| 1508 // Obtain string descriptions for architectures | |
| 1509 | |
| 1510 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 1511 int running_arch_index=-1; | |
| 1512 | |
| 1513 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 1514 if (running_arch_code == arch_array[i].code) { | |
| 1515 running_arch_index = i; | |
| 1516 } | |
| 1517 if (lib_arch.code == arch_array[i].code) { | |
| 1518 lib_arch.compat_class = arch_array[i].compat_class; | |
| 1519 lib_arch.name = arch_array[i].name; | |
| 1520 } | |
| 1521 } | |
| 1522 | |
| 1523 assert(running_arch_index != -1, | |
| 1524 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 1525 if (running_arch_index == -1) { | |
| 1526 // Even though running architecture detection failed | |
| 1527 // we may still continue with reporting dlerror() message | |
| 1528 return NULL; | |
| 1529 } | |
| 1530 | |
| 1531 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 1532 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 1533 return NULL; | |
| 1534 } | |
| 1535 | |
| 1536 #ifndef S390 | |
| 1537 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
| 1538 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 1539 return NULL; | |
| 1540 } | |
| 1541 #endif // !S390 | |
| 1542 | |
| 1543 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 1544 if ( lib_arch.name!=NULL ) { | |
| 1545 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1546 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 1547 lib_arch.name, arch_array[running_arch_index].name); | |
| 1548 } else { | |
| 1549 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1550 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 1551 lib_arch.code, | |
| 1552 arch_array[running_arch_index].name); | |
| 1553 } | |
| 1554 } | |
| 1555 | |
| 1556 return NULL; | |
| 1557 } | |
| 1558 #endif /* !__APPLE__ */ | |
| 1559 | |
|
14286
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|
1560 void* os::get_default_process_handle() { |
|
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|
1561 #ifdef __APPLE__ |
|
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8031968: Mac OS X: VM starts the agent by calling both Agent_OnAttach and Agent_OnAttach_L functions if its agent library is dynamically linked.
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|
1562 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY |
|
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8031968: Mac OS X: VM starts the agent by calling both Agent_OnAttach and Agent_OnAttach_L functions if its agent library is dynamically linked.
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13025
diff
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|
1563 // to avoid finding unexpected symbols on second (or later) |
|
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8031968: Mac OS X: VM starts the agent by calling both Agent_OnAttach and Agent_OnAttach_L functions if its agent library is dynamically linked.
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|
1564 // loads of a library. |
|
c250880a6673
8031968: Mac OS X: VM starts the agent by calling both Agent_OnAttach and Agent_OnAttach_L functions if its agent library is dynamically linked.
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diff
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|
1565 return (void*)::dlopen(NULL, RTLD_FIRST); |
|
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|
1566 #else |
|
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|
1567 return (void*)::dlopen(NULL, RTLD_LAZY); |
|
c250880a6673
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|
1568 #endif |
|
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|
1569 } |
|
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|
1570 |
| 3960 | 1571 // XXX: Do we need a lock around this as per Linux? |
| 1572 void* os::dll_lookup(void* handle, const char* name) { | |
| 1573 return dlsym(handle, name); | |
| 1574 } | |
| 1575 | |
| 1576 | |
| 1577 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
| 1578 int fd = ::open(filename, O_RDONLY); | |
| 1579 if (fd == -1) { | |
| 1580 return false; | |
| 1581 } | |
| 1582 | |
| 1583 char buf[32]; | |
| 1584 int bytes; | |
| 1585 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
| 1586 st->print_raw(buf, bytes); | |
| 1587 } | |
| 1588 | |
| 1589 ::close(fd); | |
| 1590 | |
| 1591 return true; | |
| 1592 } | |
| 1593 | |
| 1594 void os::print_dll_info(outputStream *st) { | |
|
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|
1595 st->print_cr("Dynamic libraries:"); |
| 3960 | 1596 #ifdef RTLD_DI_LINKMAP |
|
11092
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|
1597 Dl_info dli; |
|
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|
1598 void *handle; |
|
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|
1599 Link_map *map; |
|
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|
1600 Link_map *p; |
|
59b052799158
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|
1601 |
|
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|
1602 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || |
|
59b052799158
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|
1603 dli.dli_fname == NULL) { |
|
59b052799158
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|
1604 st->print_cr("Error: Cannot print dynamic libraries."); |
|
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|
1605 return; |
|
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|
1606 } |
|
59b052799158
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|
1607 handle = dlopen(dli.dli_fname, RTLD_LAZY); |
|
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|
1608 if (handle == NULL) { |
|
59b052799158
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|
1609 st->print_cr("Error: Cannot print dynamic libraries."); |
|
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|
1610 return; |
|
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|
1611 } |
|
59b052799158
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|
1612 dlinfo(handle, RTLD_DI_LINKMAP, &map); |
|
59b052799158
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|
1613 if (map == NULL) { |
|
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|
1614 st->print_cr("Error: Cannot print dynamic libraries."); |
|
59b052799158
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|
1615 return; |
|
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|
1616 } |
|
59b052799158
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|
1617 |
|
59b052799158
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|
1618 while (map->l_prev != NULL) |
|
59b052799158
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|
1619 map = map->l_prev; |
|
59b052799158
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|
1620 |
|
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|
1621 while (map != NULL) { |
|
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|
1622 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); |
|
59b052799158
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|
1623 map = map->l_next; |
|
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|
1624 } |
|
59b052799158
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|
1625 |
|
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|
1626 dlclose(handle); |
| 3960 | 1627 #elif defined(__APPLE__) |
|
11092
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|
1628 uint32_t count; |
|
59b052799158
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dcubed
parents:
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changeset
|
1629 uint32_t i; |
|
59b052799158
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parents:
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|
1630 |
|
59b052799158
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|
1631 count = _dyld_image_count(); |
|
59b052799158
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|
1632 for (i = 1; i < count; i++) { |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1633 const char *name = _dyld_get_image_name(i); |
|
59b052799158
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|
1634 intptr_t slide = _dyld_get_image_vmaddr_slide(i); |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1635 st->print_cr(PTR_FORMAT " \t%s", slide, name); |
|
59b052799158
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|
1636 } |
| 3960 | 1637 #else |
|
11092
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|
1638 st->print_cr("Error: Cannot print dynamic libraries."); |
| 3960 | 1639 #endif |
| 1640 } | |
| 1641 | |
|
6080
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changeset
|
1642 void os::print_os_info_brief(outputStream* st) { |
|
7432b9db36ff
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5921
diff
changeset
|
1643 st->print("Bsd"); |
|
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diff
changeset
|
1644 |
|
7432b9db36ff
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|
1645 os::Posix::print_uname_info(st); |
|
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|
1646 } |
| 3960 | 1647 |
| 1648 void os::print_os_info(outputStream* st) { | |
| 1649 st->print("OS:"); | |
|
6080
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|
1650 st->print("Bsd"); |
|
7432b9db36ff
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diff
changeset
|
1651 |
|
7432b9db36ff
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diff
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|
1652 os::Posix::print_uname_info(st); |
|
7432b9db36ff
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changeset
|
1653 |
|
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diff
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|
1654 os::Posix::print_rlimit_info(st); |
|
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|
1655 |
|
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|
1656 os::Posix::print_load_average(st); |
| 3960 | 1657 } |
| 1658 | |
| 1659 void os::pd_print_cpu_info(outputStream* st) { | |
| 1660 // Nothing to do for now. | |
| 1661 } | |
| 1662 | |
| 1663 void os::print_memory_info(outputStream* st) { | |
| 1664 | |
| 1665 st->print("Memory:"); | |
| 1666 st->print(" %dk page", os::vm_page_size()>>10); | |
| 1667 | |
| 1668 st->print(", physical " UINT64_FORMAT "k", | |
| 1669 os::physical_memory() >> 10); | |
| 1670 st->print("(" UINT64_FORMAT "k free)", | |
| 1671 os::available_memory() >> 10); | |
| 1672 st->cr(); | |
| 1673 | |
| 1674 // meminfo | |
| 1675 st->print("\n/proc/meminfo:\n"); | |
| 1676 _print_ascii_file("/proc/meminfo", st); | |
| 1677 st->cr(); | |
| 1678 } | |
| 1679 | |
| 1680 void os::print_siginfo(outputStream* st, void* siginfo) { | |
| 14410 | 1681 const siginfo_t* si = (const siginfo_t*)siginfo; |
| 1682 | |
| 1683 os::Posix::print_siginfo_brief(st, si); | |
| 1684 | |
| 1685 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
| 3960 | 1686 UseSharedSpaces) { |
| 1687 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 1688 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 1689 st->print("\n\nError accessing class data sharing archive." \ | |
| 1690 " Mapped file inaccessible during execution, " \ | |
| 1691 " possible disk/network problem."); | |
| 1692 } | |
| 1693 } | |
| 1694 st->cr(); | |
| 1695 } | |
| 1696 | |
| 1697 | |
| 1698 static void print_signal_handler(outputStream* st, int sig, | |
| 1699 char* buf, size_t buflen); | |
| 1700 | |
| 1701 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 1702 st->print_cr("Signal Handlers:"); | |
| 1703 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 1704 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 1705 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 1706 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 1707 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 1708 print_signal_handler(st, SIGILL , buf, buflen); | |
| 1709 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 1710 print_signal_handler(st, SR_signum, buf, buflen); | |
| 1711 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 1712 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 1713 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 1714 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
| 1715 } | |
| 1716 | |
| 1717 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 1718 | |
|
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dcubed
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|
1719 // Find the full path to the current module, libjvm |
| 3960 | 1720 void os::jvm_path(char *buf, jint buflen) { |
| 1721 // Error checking. | |
| 1722 if (buflen < MAXPATHLEN) { | |
| 1723 assert(false, "must use a large-enough buffer"); | |
| 1724 buf[0] = '\0'; | |
| 1725 return; | |
| 1726 } | |
| 1727 // Lazy resolve the path to current module. | |
| 1728 if (saved_jvm_path[0] != 0) { | |
| 1729 strcpy(buf, saved_jvm_path); | |
| 1730 return; | |
| 1731 } | |
| 1732 | |
| 1733 char dli_fname[MAXPATHLEN]; | |
| 1734 bool ret = dll_address_to_library_name( | |
| 1735 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 1736 dli_fname, sizeof(dli_fname), NULL); | |
|
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1737 assert(ret, "cannot locate libjvm"); |
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1738 char *rp = NULL; |
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1739 if (ret && dli_fname[0] != '\0') { |
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1740 rp = realpath(dli_fname, buf); |
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1741 } |
| 3960 | 1742 if (rp == NULL) |
| 1743 return; | |
| 1744 | |
|
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1745 if (Arguments::sun_java_launcher_is_altjvm()) { |
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1746 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical |
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1747 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so" |
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1748 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/" |
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1749 // appears at the right place in the string, then assume we are |
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1750 // installed in a JDK and we're done. Otherwise, check for a |
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1751 // JAVA_HOME environment variable and construct a path to the JVM |
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1752 // being overridden. |
| 4846 | 1753 |
| 3960 | 1754 const char *p = buf + strlen(buf) - 1; |
| 1755 for (int count = 0; p > buf && count < 5; ++count) { | |
| 1756 for (--p; p > buf && *p != '/'; --p) | |
| 1757 /* empty */ ; | |
| 1758 } | |
| 1759 | |
| 1760 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 1761 // Look for JAVA_HOME in the environment. | |
| 1762 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 1763 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 1764 char* jrelib_p; | |
| 1765 int len; | |
| 1766 | |
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1767 // Check the current module name "libjvm" |
| 3960 | 1768 p = strrchr(buf, '/'); |
| 1769 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 1770 | |
| 1771 rp = realpath(java_home_var, buf); | |
| 1772 if (rp == NULL) | |
| 1773 return; | |
| 1774 | |
| 1775 // determine if this is a legacy image or modules image | |
| 1776 // modules image doesn't have "jre" subdirectory | |
| 1777 len = strlen(buf); | |
| 1778 jrelib_p = buf + len; | |
| 4846 | 1779 |
| 1780 // Add the appropriate library subdir | |
| 1781 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
| 3960 | 1782 if (0 != access(buf, F_OK)) { |
| 4846 | 1783 snprintf(jrelib_p, buflen-len, "/lib"); |
| 3960 | 1784 } |
| 1785 | |
| 4846 | 1786 // Add the appropriate client or server subdir |
| 1787 len = strlen(buf); | |
| 1788 jrelib_p = buf + len; | |
| 1789 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
| 1790 if (0 != access(buf, F_OK)) { | |
| 1791 snprintf(jrelib_p, buflen-len, ""); | |
| 1792 } | |
| 1793 | |
| 1794 // If the path exists within JAVA_HOME, add the JVM library name | |
| 1795 // to complete the path to JVM being overridden. Otherwise fallback | |
| 1796 // to the path to the current library. | |
| 3960 | 1797 if (0 == access(buf, F_OK)) { |
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1798 // Use current module name "libjvm" |
| 3960 | 1799 len = strlen(buf); |
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1800 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
| 3960 | 1801 } else { |
| 4846 | 1802 // Fall back to path of current library |
| 3960 | 1803 rp = realpath(dli_fname, buf); |
| 1804 if (rp == NULL) | |
| 1805 return; | |
| 1806 } | |
| 1807 } | |
| 1808 } | |
| 1809 } | |
| 1810 | |
| 1811 strcpy(saved_jvm_path, buf); | |
| 1812 } | |
| 1813 | |
| 1814 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 1815 // no prefix required, not even "_" | |
| 1816 } | |
| 1817 | |
| 1818 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 1819 // no suffix required | |
| 1820 } | |
| 1821 | |
| 1822 //////////////////////////////////////////////////////////////////////////////// | |
| 1823 // sun.misc.Signal support | |
| 1824 | |
| 1825 static volatile jint sigint_count = 0; | |
| 1826 | |
| 1827 static void | |
| 1828 UserHandler(int sig, void *siginfo, void *context) { | |
| 1829 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 1830 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 1831 // don't want to flood the manager thread with sem_post requests. | |
| 1832 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 1833 return; | |
| 1834 | |
| 1835 // Ctrl-C is pressed during error reporting, likely because the error | |
| 1836 // handler fails to abort. Let VM die immediately. | |
| 1837 if (sig == SIGINT && is_error_reported()) { | |
| 1838 os::die(); | |
| 1839 } | |
| 1840 | |
| 1841 os::signal_notify(sig); | |
| 1842 } | |
| 1843 | |
| 1844 void* os::user_handler() { | |
| 1845 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 1846 } | |
| 1847 | |
| 1848 extern "C" { | |
| 1849 typedef void (*sa_handler_t)(int); | |
| 1850 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 1851 } | |
| 1852 | |
| 1853 void* os::signal(int signal_number, void* handler) { | |
| 1854 struct sigaction sigAct, oldSigAct; | |
| 1855 | |
| 1856 sigfillset(&(sigAct.sa_mask)); | |
| 1857 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 1858 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 1859 | |
| 1860 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 1861 // -1 means registration failed | |
| 1862 return (void *)-1; | |
| 1863 } | |
| 1864 | |
| 1865 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 1866 } | |
| 1867 | |
| 1868 void os::signal_raise(int signal_number) { | |
| 1869 ::raise(signal_number); | |
| 1870 } | |
| 1871 | |
| 1872 /* | |
| 1873 * The following code is moved from os.cpp for making this | |
| 1874 * code platform specific, which it is by its very nature. | |
| 1875 */ | |
| 1876 | |
| 1877 // Will be modified when max signal is changed to be dynamic | |
| 1878 int os::sigexitnum_pd() { | |
| 1879 return NSIG; | |
| 1880 } | |
| 1881 | |
| 1882 // a counter for each possible signal value | |
| 1883 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 1884 | |
| 1885 // Bsd(POSIX) specific hand shaking semaphore. | |
| 1886 #ifdef __APPLE__ | |
| 10405 | 1887 typedef semaphore_t os_semaphore_t; |
| 3960 | 1888 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
| 10405 | 1889 #define SEM_WAIT(sem) semaphore_wait(sem) |
| 1890 #define SEM_POST(sem) semaphore_signal(sem) | |
| 1891 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) | |
| 3960 | 1892 #else |
| 10405 | 1893 typedef sem_t os_semaphore_t; |
| 3960 | 1894 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
| 10405 | 1895 #define SEM_WAIT(sem) sem_wait(&sem) |
| 1896 #define SEM_POST(sem) sem_post(&sem) | |
| 1897 #define SEM_DESTROY(sem) sem_destroy(&sem) | |
| 3960 | 1898 #endif |
| 1899 | |
| 10405 | 1900 class Semaphore : public StackObj { |
| 1901 public: | |
| 1902 Semaphore(); | |
| 1903 ~Semaphore(); | |
| 1904 void signal(); | |
| 1905 void wait(); | |
| 1906 bool trywait(); | |
| 1907 bool timedwait(unsigned int sec, int nsec); | |
| 1908 private: | |
| 1909 jlong currenttime() const; | |
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1910 os_semaphore_t _semaphore; |
| 10405 | 1911 }; |
| 1912 | |
| 1913 Semaphore::Semaphore() : _semaphore(0) { | |
| 1914 SEM_INIT(_semaphore, 0); | |
| 1915 } | |
| 1916 | |
| 1917 Semaphore::~Semaphore() { | |
| 1918 SEM_DESTROY(_semaphore); | |
| 1919 } | |
| 1920 | |
| 1921 void Semaphore::signal() { | |
| 1922 SEM_POST(_semaphore); | |
| 1923 } | |
| 1924 | |
| 1925 void Semaphore::wait() { | |
| 1926 SEM_WAIT(_semaphore); | |
| 1927 } | |
| 1928 | |
| 1929 jlong Semaphore::currenttime() const { | |
| 1930 struct timeval tv; | |
| 1931 gettimeofday(&tv, NULL); | |
| 1932 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); | |
| 1933 } | |
| 1934 | |
| 1935 #ifdef __APPLE__ | |
| 1936 bool Semaphore::trywait() { | |
| 1937 return timedwait(0, 0); | |
| 1938 } | |
| 1939 | |
| 1940 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 1941 kern_return_t kr = KERN_ABORTED; | |
| 1942 mach_timespec_t waitspec; | |
| 1943 waitspec.tv_sec = sec; | |
| 1944 waitspec.tv_nsec = nsec; | |
| 1945 | |
| 1946 jlong starttime = currenttime(); | |
| 1947 | |
| 1948 kr = semaphore_timedwait(_semaphore, waitspec); | |
| 1949 while (kr == KERN_ABORTED) { | |
| 1950 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; | |
| 1951 | |
| 1952 jlong current = currenttime(); | |
| 1953 jlong passedtime = current - starttime; | |
| 1954 | |
| 1955 if (passedtime >= totalwait) { | |
| 1956 waitspec.tv_sec = 0; | |
| 1957 waitspec.tv_nsec = 0; | |
| 1958 } else { | |
| 1959 jlong waittime = totalwait - (current - starttime); | |
| 1960 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; | |
| 1961 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; | |
| 1962 } | |
| 1963 | |
| 1964 kr = semaphore_timedwait(_semaphore, waitspec); | |
| 1965 } | |
| 1966 | |
| 1967 return kr == KERN_SUCCESS; | |
| 1968 } | |
| 1969 | |
| 1970 #else | |
| 1971 | |
| 1972 bool Semaphore::trywait() { | |
| 1973 return sem_trywait(&_semaphore) == 0; | |
| 1974 } | |
| 1975 | |
| 1976 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 1977 struct timespec ts; | |
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1978 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); |
| 10405 | 1979 |
| 1980 while (1) { | |
| 1981 int result = sem_timedwait(&_semaphore, &ts); | |
| 1982 if (result == 0) { | |
| 1983 return true; | |
| 1984 } else if (errno == EINTR) { | |
| 1985 continue; | |
| 1986 } else if (errno == ETIMEDOUT) { | |
| 1987 return false; | |
| 1988 } else { | |
| 1989 return false; | |
| 1990 } | |
| 1991 } | |
| 1992 } | |
| 1993 | |
| 1994 #endif // __APPLE__ | |
| 1995 | |
| 1996 static os_semaphore_t sig_sem; | |
| 1997 static Semaphore sr_semaphore; | |
| 1998 | |
| 3960 | 1999 void os::signal_init_pd() { |
| 2000 // Initialize signal structures | |
| 2001 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 2002 | |
| 2003 // Initialize signal semaphore | |
| 2004 ::SEM_INIT(sig_sem, 0); | |
| 2005 } | |
| 2006 | |
| 2007 void os::signal_notify(int sig) { | |
| 2008 Atomic::inc(&pending_signals[sig]); | |
| 2009 ::SEM_POST(sig_sem); | |
| 2010 } | |
| 2011 | |
| 2012 static int check_pending_signals(bool wait) { | |
| 2013 Atomic::store(0, &sigint_count); | |
| 2014 for (;;) { | |
| 2015 for (int i = 0; i < NSIG + 1; i++) { | |
| 2016 jint n = pending_signals[i]; | |
| 2017 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 2018 return i; | |
| 2019 } | |
| 2020 } | |
| 2021 if (!wait) { | |
| 2022 return -1; | |
| 2023 } | |
| 2024 JavaThread *thread = JavaThread::current(); | |
| 2025 ThreadBlockInVM tbivm(thread); | |
| 2026 | |
| 2027 bool threadIsSuspended; | |
| 2028 do { | |
| 2029 thread->set_suspend_equivalent(); | |
| 2030 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 2031 ::SEM_WAIT(sig_sem); | |
| 2032 | |
| 2033 // were we externally suspended while we were waiting? | |
| 2034 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 2035 if (threadIsSuspended) { | |
| 2036 // | |
| 2037 // The semaphore has been incremented, but while we were waiting | |
| 2038 // another thread suspended us. We don't want to continue running | |
| 2039 // while suspended because that would surprise the thread that | |
| 2040 // suspended us. | |
| 2041 // | |
| 2042 ::SEM_POST(sig_sem); | |
| 2043 | |
| 2044 thread->java_suspend_self(); | |
| 2045 } | |
| 2046 } while (threadIsSuspended); | |
| 2047 } | |
| 2048 } | |
| 2049 | |
| 2050 int os::signal_lookup() { | |
| 2051 return check_pending_signals(false); | |
| 2052 } | |
| 2053 | |
| 2054 int os::signal_wait() { | |
| 2055 return check_pending_signals(true); | |
| 2056 } | |
| 2057 | |
| 2058 //////////////////////////////////////////////////////////////////////////////// | |
| 2059 // Virtual Memory | |
| 2060 | |
| 2061 int os::vm_page_size() { | |
| 2062 // Seems redundant as all get out | |
| 2063 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2064 return os::Bsd::page_size(); | |
| 2065 } | |
| 2066 | |
| 2067 // Solaris allocates memory by pages. | |
| 2068 int os::vm_allocation_granularity() { | |
| 2069 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2070 return os::Bsd::page_size(); | |
| 2071 } | |
| 2072 | |
| 2073 // Rationale behind this function: | |
| 2074 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 2075 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 2076 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 2077 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 2078 // info for the reporting script by storing timestamp and location of symbol | |
| 2079 void bsd_wrap_code(char* base, size_t size) { | |
| 2080 static volatile jint cnt = 0; | |
| 2081 | |
| 2082 if (!UseOprofile) { | |
| 2083 return; | |
| 2084 } | |
| 2085 | |
| 2086 char buf[PATH_MAX + 1]; | |
| 2087 int num = Atomic::add(1, &cnt); | |
| 2088 | |
| 2089 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
| 2090 os::get_temp_directory(), os::current_process_id(), num); | |
| 2091 unlink(buf); | |
| 2092 | |
| 2093 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
| 2094 | |
| 2095 if (fd != -1) { | |
| 2096 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
| 2097 if (rv != (off_t)-1) { | |
| 2098 if (::write(fd, "", 1) == 1) { | |
| 2099 mmap(base, size, | |
| 2100 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 2101 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 2102 } | |
| 2103 } | |
| 2104 ::close(fd); | |
| 2105 unlink(buf); | |
| 2106 } | |
| 2107 } | |
| 2108 | |
|
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2109 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
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2110 int err) { |
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2111 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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2112 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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2113 strerror(err), err); |
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2114 } |
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2115 |
| 3960 | 2116 // NOTE: Bsd kernel does not really reserve the pages for us. |
| 2117 // All it does is to check if there are enough free pages | |
| 2118 // left at the time of mmap(). This could be a potential | |
| 2119 // problem. | |
| 6197 | 2120 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| 3960 | 2121 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 2122 #ifdef __OpenBSD__ | |
| 2123 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
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2124 if (::mprotect(addr, size, prot) == 0) { |
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2125 return true; |
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2126 } |
| 3960 | 2127 #else |
| 2128 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 2129 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
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2130 if (res != (uintptr_t) MAP_FAILED) { |
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2131 return true; |
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2132 } |
| 3960 | 2133 #endif |
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2134 |
|
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2135 // Warn about any commit errors we see in non-product builds just |
|
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2136 // in case mmap() doesn't work as described on the man page. |
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|
2137 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) |
|
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|
2138 |
|
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|
2139 return false; |
| 3960 | 2140 } |
| 2141 | |
| 6197 | 2142 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| 3960 | 2143 bool exec) { |
|
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|
2144 // alignment_hint is ignored on this OS |
|
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|
2145 return pd_commit_memory(addr, size, exec); |
|
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|
2146 } |
|
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2147 |
|
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|
2148 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
|
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|
2149 const char* mesg) { |
|
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|
2150 assert(mesg != NULL, "mesg must be specified"); |
|
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|
2151 if (!pd_commit_memory(addr, size, exec)) { |
|
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|
2152 // add extra info in product mode for vm_exit_out_of_memory(): |
|
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|
2153 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) |
|
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|
2154 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
|
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|
2155 } |
|
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|
2156 } |
|
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|
2157 |
|
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|
2158 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
|
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|
2159 size_t alignment_hint, bool exec, |
|
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|
2160 const char* mesg) { |
|
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2161 // alignment_hint is ignored on this OS |
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|
2162 pd_commit_memory_or_exit(addr, size, exec, mesg); |
| 3960 | 2163 } |
| 2164 | |
| 6197 | 2165 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2166 } |
| 2167 | |
| 6197 | 2168 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2169 ::madvise(addr, bytes, MADV_DONTNEED); |
| 2170 } | |
| 2171 | |
| 2172 void os::numa_make_global(char *addr, size_t bytes) { | |
| 2173 } | |
| 2174 | |
| 2175 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
| 2176 } | |
| 2177 | |
| 2178 bool os::numa_topology_changed() { return false; } | |
| 2179 | |
| 2180 size_t os::numa_get_groups_num() { | |
| 2181 return 1; | |
| 2182 } | |
| 2183 | |
| 2184 int os::numa_get_group_id() { | |
| 2185 return 0; | |
| 2186 } | |
| 2187 | |
| 2188 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
| 2189 if (size > 0) { | |
| 2190 ids[0] = 0; | |
| 2191 return 1; | |
| 2192 } | |
| 2193 return 0; | |
| 2194 } | |
| 2195 | |
| 2196 bool os::get_page_info(char *start, page_info* info) { | |
| 2197 return false; | |
| 2198 } | |
| 2199 | |
| 2200 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2201 return end; | |
| 2202 } | |
| 2203 | |
| 2204 | |
| 6197 | 2205 bool os::pd_uncommit_memory(char* addr, size_t size) { |
| 3960 | 2206 #ifdef __OpenBSD__ |
| 2207 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2208 return ::mprotect(addr, size, PROT_NONE) == 0; | |
| 2209 #else | |
| 2210 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
| 2211 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
| 2212 return res != (uintptr_t) MAP_FAILED; | |
| 2213 #endif | |
| 2214 } | |
| 2215 | |
| 6197 | 2216 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
|
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|
2217 return os::commit_memory(addr, size, !ExecMem); |
| 3960 | 2218 } |
| 2219 | |
| 2220 // If this is a growable mapping, remove the guard pages entirely by | |
| 2221 // munmap()ping them. If not, just call uncommit_memory(). | |
| 2222 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
| 2223 return os::uncommit_memory(addr, size); | |
| 2224 } | |
| 2225 | |
| 2226 static address _highest_vm_reserved_address = NULL; | |
| 2227 | |
| 2228 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 2229 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 2230 // location, however, they will be overwritten. If 'fixed' is false, | |
| 2231 // 'requested_addr' is only treated as a hint, the return value may or | |
| 2232 // may not start from the requested address. Unlike Bsd mmap(), this | |
| 2233 // function returns NULL to indicate failure. | |
| 2234 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 2235 char * addr; | |
| 2236 int flags; | |
| 2237 | |
| 2238 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 2239 if (fixed) { | |
| 2240 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
| 2241 flags |= MAP_FIXED; | |
| 2242 } | |
| 2243 | |
| 10157 | 2244 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
| 2245 // touch an uncommitted page. Otherwise, the read/write might | |
| 2246 // succeed if we have enough swap space to back the physical page. | |
| 2247 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
| 3960 | 2248 flags, -1, 0); |
| 2249 | |
| 2250 if (addr != MAP_FAILED) { | |
| 2251 // anon_mmap() should only get called during VM initialization, | |
| 2252 // don't need lock (actually we can skip locking even it can be called | |
| 2253 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 2254 // hint about the upper limit of non-stack memory regions.) | |
| 2255 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 2256 _highest_vm_reserved_address = (address)addr + bytes; | |
| 2257 } | |
| 2258 } | |
| 2259 | |
| 2260 return addr == MAP_FAILED ? NULL : addr; | |
| 2261 } | |
| 2262 | |
| 2263 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 2264 // regions above addr + size. If so, releasing a memory region only creates | |
| 2265 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 2266 // | |
| 2267 static int anon_munmap(char * addr, size_t size) { | |
| 2268 return ::munmap(addr, size) == 0; | |
| 2269 } | |
| 2270 | |
| 6197 | 2271 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 3960 | 2272 size_t alignment_hint) { |
| 2273 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 2274 } | |
| 2275 | |
| 6197 | 2276 bool os::pd_release_memory(char* addr, size_t size) { |
| 3960 | 2277 return anon_munmap(addr, size); |
| 2278 } | |
| 2279 | |
| 2280 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
| 2281 // Bsd wants the mprotect address argument to be page aligned. | |
| 2282 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
| 2283 | |
| 2284 // According to SUSv3, mprotect() should only be used with mappings | |
| 2285 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 2286 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 2287 // protection of malloc'ed or statically allocated memory). Check the | |
| 2288 // caller if you hit this assert. | |
| 2289 assert(addr == bottom, "sanity check"); | |
| 2290 | |
| 2291 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
| 2292 return ::mprotect(bottom, size, prot) == 0; | |
| 2293 } | |
| 2294 | |
| 2295 // Set protections specified | |
| 2296 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
| 2297 bool is_committed) { | |
| 2298 unsigned int p = 0; | |
| 2299 switch (prot) { | |
| 2300 case MEM_PROT_NONE: p = PROT_NONE; break; | |
| 2301 case MEM_PROT_READ: p = PROT_READ; break; | |
| 2302 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
| 2303 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
| 2304 default: | |
| 2305 ShouldNotReachHere(); | |
| 2306 } | |
| 2307 // is_committed is unused. | |
| 2308 return bsd_mprotect(addr, bytes, p); | |
| 2309 } | |
| 2310 | |
| 2311 bool os::guard_memory(char* addr, size_t size) { | |
| 2312 return bsd_mprotect(addr, size, PROT_NONE); | |
| 2313 } | |
| 2314 | |
| 2315 bool os::unguard_memory(char* addr, size_t size) { | |
| 2316 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
| 2317 } | |
| 2318 | |
| 2319 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
| 6918 | 2320 return false; |
| 3960 | 2321 } |
| 2322 | |
| 2323 // Large page support | |
| 2324 | |
| 2325 static size_t _large_page_size = 0; | |
| 2326 | |
| 2327 void os::large_page_init() { | |
| 2328 } | |
| 2329 | |
| 2330 | |
|
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2331 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
|
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|
2332 fatal("This code is not used or maintained."); |
|
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|
2333 |
| 3960 | 2334 // "exec" is passed in but not used. Creating the shared image for |
| 2335 // the code cache doesn't have an SHM_X executable permission to check. | |
| 2336 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
| 2337 | |
| 2338 key_t key = IPC_PRIVATE; | |
| 2339 char *addr; | |
| 2340 | |
| 2341 bool warn_on_failure = UseLargePages && | |
| 2342 (!FLAG_IS_DEFAULT(UseLargePages) || | |
| 2343 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
| 2344 ); | |
| 2345 char msg[128]; | |
| 2346 | |
| 2347 // Create a large shared memory region to attach to based on size. | |
| 2348 // Currently, size is the total size of the heap | |
| 2349 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
| 2350 if (shmid == -1) { | |
| 2351 // Possible reasons for shmget failure: | |
| 2352 // 1. shmmax is too small for Java heap. | |
| 2353 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 2354 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 2355 // 2. not enough large page memory. | |
| 2356 // > check available large pages: cat /proc/meminfo | |
| 2357 // > increase amount of large pages: | |
| 2358 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 2359 // Note 1: different Bsd may use different name for this property, | |
| 2360 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 2361 // Note 2: it's possible there's enough physical memory available but | |
| 2362 // they are so fragmented after a long run that they can't | |
| 2363 // coalesce into large pages. Try to reserve large pages when | |
| 2364 // the system is still "fresh". | |
| 2365 if (warn_on_failure) { | |
| 2366 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
| 2367 warning(msg); | |
| 2368 } | |
| 2369 return NULL; | |
| 2370 } | |
| 2371 | |
| 2372 // attach to the region | |
| 2373 addr = (char*)shmat(shmid, req_addr, 0); | |
| 2374 int err = errno; | |
| 2375 | |
| 2376 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 2377 // will be deleted when it's detached by shmdt() or when the process | |
| 2378 // terminates. If shmat() is not successful this will remove the shared | |
| 2379 // segment immediately. | |
| 2380 shmctl(shmid, IPC_RMID, NULL); | |
| 2381 | |
| 2382 if ((intptr_t)addr == -1) { | |
| 2383 if (warn_on_failure) { | |
| 2384 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
| 2385 warning(msg); | |
| 2386 } | |
| 2387 return NULL; | |
| 2388 } | |
| 2389 | |
|
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2390 // The memory is committed |
|
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|
2391 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
|
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2392 |
| 3960 | 2393 return addr; |
| 2394 } | |
| 2395 | |
| 2396 bool os::release_memory_special(char* base, size_t bytes) { | |
|
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|
2397 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
| 3960 | 2398 // detaching the SHM segment will also delete it, see reserve_memory_special() |
| 2399 int rslt = shmdt(base); | |
|
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|
2400 if (rslt == 0) { |
|
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|
2401 tkr.record((address)base, bytes); |
|
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|
2402 return true; |
|
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|
2403 } else { |
|
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|
2404 tkr.discard(); |
|
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|
2405 return false; |
|
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|
2406 } |
|
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|
2407 |
| 3960 | 2408 } |
| 2409 | |
| 2410 size_t os::large_page_size() { | |
| 2411 return _large_page_size; | |
| 2412 } | |
| 2413 | |
| 2414 // HugeTLBFS allows application to commit large page memory on demand; | |
| 2415 // with SysV SHM the entire memory region must be allocated as shared | |
| 2416 // memory. | |
| 2417 bool os::can_commit_large_page_memory() { | |
| 2418 return UseHugeTLBFS; | |
| 2419 } | |
| 2420 | |
| 2421 bool os::can_execute_large_page_memory() { | |
| 2422 return UseHugeTLBFS; | |
| 2423 } | |
| 2424 | |
| 2425 // Reserve memory at an arbitrary address, only if that area is | |
| 2426 // available (and not reserved for something else). | |
| 2427 | |
| 6197 | 2428 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 3960 | 2429 const int max_tries = 10; |
| 2430 char* base[max_tries]; | |
| 2431 size_t size[max_tries]; | |
| 2432 const size_t gap = 0x000000; | |
| 2433 | |
| 2434 // Assert only that the size is a multiple of the page size, since | |
| 2435 // that's all that mmap requires, and since that's all we really know | |
| 2436 // about at this low abstraction level. If we need higher alignment, | |
| 2437 // we can either pass an alignment to this method or verify alignment | |
| 2438 // in one of the methods further up the call chain. See bug 5044738. | |
| 2439 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 2440 | |
| 2441 // Repeatedly allocate blocks until the block is allocated at the | |
| 2442 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 2443 // automatically update _highest_vm_reserved_address if the call is | |
| 2444 // successful. The variable tracks the highest memory address every reserved | |
| 2445 // by JVM. It is used to detect heap-stack collision if running with | |
| 2446 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
| 2447 // space than needed, it could confuse the collision detecting code. To | |
| 2448 // solve the problem, save current _highest_vm_reserved_address and | |
| 2449 // calculate the correct value before return. | |
| 2450 address old_highest = _highest_vm_reserved_address; | |
| 2451 | |
| 2452 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
| 2453 // if kernel honors the hint then we can return immediately. | |
| 2454 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 2455 if (addr == requested_addr) { | |
| 2456 return requested_addr; | |
| 2457 } | |
| 2458 | |
| 2459 if (addr != NULL) { | |
| 2460 // mmap() is successful but it fails to reserve at the requested address | |
| 2461 anon_munmap(addr, bytes); | |
| 2462 } | |
| 2463 | |
| 2464 int i; | |
| 2465 for (i = 0; i < max_tries; ++i) { | |
| 2466 base[i] = reserve_memory(bytes); | |
| 2467 | |
| 2468 if (base[i] != NULL) { | |
| 2469 // Is this the block we wanted? | |
| 2470 if (base[i] == requested_addr) { | |
| 2471 size[i] = bytes; | |
| 2472 break; | |
| 2473 } | |
| 2474 | |
| 2475 // Does this overlap the block we wanted? Give back the overlapped | |
| 2476 // parts and try again. | |
| 2477 | |
| 2478 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 2479 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 2480 unmap_memory(base[i], top_overlap); | |
| 2481 base[i] += top_overlap; | |
| 2482 size[i] = bytes - top_overlap; | |
| 2483 } else { | |
| 2484 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 2485 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 2486 unmap_memory(requested_addr, bottom_overlap); | |
| 2487 size[i] = bytes - bottom_overlap; | |
| 2488 } else { | |
| 2489 size[i] = bytes; | |
| 2490 } | |
| 2491 } | |
| 2492 } | |
| 2493 } | |
| 2494 | |
| 2495 // Give back the unused reserved pieces. | |
| 2496 | |
| 2497 for (int j = 0; j < i; ++j) { | |
| 2498 if (base[j] != NULL) { | |
| 2499 unmap_memory(base[j], size[j]); | |
| 2500 } | |
| 2501 } | |
| 2502 | |
| 2503 if (i < max_tries) { | |
| 2504 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 2505 return requested_addr; | |
| 2506 } else { | |
| 2507 _highest_vm_reserved_address = old_highest; | |
| 2508 return NULL; | |
| 2509 } | |
| 2510 } | |
| 2511 | |
| 2512 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 2513 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
| 2514 } | |
| 2515 | |
| 2516 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
| 2517 // Solaris uses poll(), bsd uses park(). | |
| 2518 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 2519 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 2520 // SIGSEGV, see 4355769. | |
| 2521 | |
| 2522 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 2523 assert(thread == Thread::current(), "thread consistency check"); | |
| 2524 | |
| 2525 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2526 slp->reset() ; | |
| 2527 OrderAccess::fence() ; | |
| 2528 | |
| 2529 if (interruptible) { | |
| 2530 jlong prevtime = javaTimeNanos(); | |
| 2531 | |
| 2532 for (;;) { | |
| 2533 if (os::is_interrupted(thread, true)) { | |
| 2534 return OS_INTRPT; | |
| 2535 } | |
| 2536 | |
| 2537 jlong newtime = javaTimeNanos(); | |
| 2538 | |
| 2539 if (newtime - prevtime < 0) { | |
| 2540 // time moving backwards, should only happen if no monotonic clock | |
| 2541 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2542 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2543 } else { | |
|
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2544 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2545 } |
| 2546 | |
| 2547 if(millis <= 0) { | |
| 2548 return OS_OK; | |
| 2549 } | |
| 2550 | |
| 2551 prevtime = newtime; | |
| 2552 | |
| 2553 { | |
| 2554 assert(thread->is_Java_thread(), "sanity check"); | |
| 2555 JavaThread *jt = (JavaThread *) thread; | |
| 2556 ThreadBlockInVM tbivm(jt); | |
| 2557 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 2558 | |
| 2559 jt->set_suspend_equivalent(); | |
| 2560 // cleared by handle_special_suspend_equivalent_condition() or | |
| 2561 // java_suspend_self() via check_and_wait_while_suspended() | |
| 2562 | |
| 2563 slp->park(millis); | |
| 2564 | |
| 2565 // were we externally suspended while we were waiting? | |
| 2566 jt->check_and_wait_while_suspended(); | |
| 2567 } | |
| 2568 } | |
| 2569 } else { | |
| 2570 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 2571 jlong prevtime = javaTimeNanos(); | |
| 2572 | |
| 2573 for (;;) { | |
| 2574 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 2575 // the 1st iteration ... | |
| 2576 jlong newtime = javaTimeNanos(); | |
| 2577 | |
| 2578 if (newtime - prevtime < 0) { | |
| 2579 // time moving backwards, should only happen if no monotonic clock | |
| 2580 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2581 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2582 } else { | |
|
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2583 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2584 } |
| 2585 | |
| 2586 if(millis <= 0) break ; | |
| 2587 | |
| 2588 prevtime = newtime; | |
| 2589 slp->park(millis); | |
| 2590 } | |
| 2591 return OS_OK ; | |
| 2592 } | |
| 2593 } | |
| 2594 | |
|
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2595 void os::naked_short_sleep(jlong ms) { |
|
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|
2596 struct timespec req; |
|
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|
2597 |
|
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2598 assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
|
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2599 req.tv_sec = 0; |
|
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2600 if (ms > 0) { |
|
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2601 req.tv_nsec = (ms % 1000) * 1000000; |
|
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2602 } |
|
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|
2603 else { |
|
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2604 req.tv_nsec = 1; |
|
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|
2605 } |
|
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|
2606 |
|
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|
2607 nanosleep(&req, NULL); |
|
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2608 |
|
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|
2609 return; |
| 3960 | 2610 } |
| 2611 | |
| 2612 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 2613 void os::infinite_sleep() { | |
| 2614 while (true) { // sleep forever ... | |
| 2615 ::sleep(100); // ... 100 seconds at a time | |
| 2616 } | |
| 2617 } | |
| 2618 | |
| 2619 // Used to convert frequent JVM_Yield() to nops | |
| 2620 bool os::dont_yield() { | |
| 2621 return DontYieldALot; | |
| 2622 } | |
| 2623 | |
| 2624 void os::yield() { | |
| 2625 sched_yield(); | |
| 2626 } | |
| 2627 | |
| 2628 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 2629 | |
| 2630 void os::yield_all(int attempts) { | |
| 2631 // Yields to all threads, including threads with lower priorities | |
| 2632 // Threads on Bsd are all with same priority. The Solaris style | |
| 2633 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 2634 sched_yield(); | |
| 2635 } | |
| 2636 | |
| 2637 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 2638 void os::loop_breaker(int attempts) { | |
| 2639 os::yield_all(attempts); | |
| 2640 } | |
| 2641 | |
| 2642 //////////////////////////////////////////////////////////////////////////////// | |
| 2643 // thread priority support | |
| 2644 | |
| 2645 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 2646 // only supports dynamic priority, static priority must be zero. For real-time | |
| 2647 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
| 2648 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 2649 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 2650 // of 5 runs - Sep 2005). | |
| 2651 // | |
| 2652 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 2653 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 2654 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 2655 // threads. It has always been the case, but could change in the future. For | |
| 2656 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 2657 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 2658 | |
| 6918 | 2659 #if !defined(__APPLE__) |
|
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2660 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2661 19, // 0 Entry should never be used |
| 2662 | |
| 2663 0, // 1 MinPriority | |
| 2664 3, // 2 | |
| 2665 6, // 3 | |
| 2666 | |
|
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2667 10, // 4 |
|
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2668 15, // 5 NormPriority |
|
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2669 18, // 6 |
|
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2670 |
|
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2671 21, // 7 |
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2672 25, // 8 |
|
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2673 28, // 9 NearMaxPriority |
|
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2674 |
|
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2675 31, // 10 MaxPriority |
|
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|
2676 |
|
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|
2677 31 // 11 CriticalPriority |
| 3960 | 2678 }; |
| 6918 | 2679 #else |
| 3960 | 2680 /* Using Mach high-level priority assignments */ |
|
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|
2681 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2682 0, // 0 Entry should never be used (MINPRI_USER) |
| 2683 | |
| 2684 27, // 1 MinPriority | |
| 2685 28, // 2 | |
| 2686 29, // 3 | |
| 2687 | |
| 2688 30, // 4 | |
| 2689 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
| 2690 32, // 6 | |
| 2691 | |
| 2692 33, // 7 | |
| 2693 34, // 8 | |
| 2694 35, // 9 NearMaxPriority | |
| 2695 | |
|
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2696 36, // 10 MaxPriority |
|
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|
2697 |
|
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|
2698 36 // 11 CriticalPriority |
| 3960 | 2699 }; |
| 2700 #endif | |
| 2701 | |
| 2702 static int prio_init() { | |
| 2703 if (ThreadPriorityPolicy == 1) { | |
| 2704 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 2705 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 2706 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 2707 if (geteuid() != 0) { | |
| 2708 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 2709 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
| 2710 } | |
| 2711 ThreadPriorityPolicy = 0; | |
| 2712 } | |
| 2713 } | |
|
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|
2714 if (UseCriticalJavaThreadPriority) { |
|
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|
2715 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
|
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|
2716 } |
| 3960 | 2717 return 0; |
| 2718 } | |
| 2719 | |
| 2720 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 2721 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 2722 | |
| 2723 #ifdef __OpenBSD__ | |
| 2724 // OpenBSD pthread_setprio starves low priority threads | |
| 2725 return OS_OK; | |
| 2726 #elif defined(__FreeBSD__) | |
| 2727 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
| 2728 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2729 struct sched_param sp; | |
| 2730 int policy; | |
| 2731 pthread_t self = pthread_self(); | |
| 2732 | |
| 2733 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
| 2734 return OS_ERR; | |
| 2735 | |
| 2736 sp.sched_priority = newpri; | |
| 2737 if (pthread_setschedparam(self, policy, &sp) != 0) | |
| 2738 return OS_ERR; | |
| 2739 | |
| 2740 return OS_OK; | |
| 2741 #else | |
| 2742 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 2743 return (ret == 0) ? OS_OK : OS_ERR; | |
| 2744 #endif | |
| 2745 } | |
| 2746 | |
| 2747 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 2748 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 2749 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 2750 return OS_OK; | |
| 2751 } | |
| 2752 | |
| 2753 errno = 0; | |
| 2754 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
| 2755 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
| 2756 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2757 int policy; | |
| 2758 struct sched_param sp; | |
| 2759 | |
| 2760 pthread_getschedparam(pthread_self(), &policy, &sp); | |
| 2761 *priority_ptr = sp.sched_priority; | |
| 2762 #else | |
| 2763 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 2764 #endif | |
| 2765 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 2766 } | |
| 2767 | |
| 2768 // Hint to the underlying OS that a task switch would not be good. | |
| 2769 // Void return because it's a hint and can fail. | |
| 2770 void os::hint_no_preempt() {} | |
| 2771 | |
| 2772 //////////////////////////////////////////////////////////////////////////////// | |
| 2773 // suspend/resume support | |
| 2774 | |
| 2775 // the low-level signal-based suspend/resume support is a remnant from the | |
| 2776 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 2777 // within hotspot. Now there is a single use-case for this: | |
| 2778 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 2779 // that runs in the watcher thread. | |
| 2780 // The remaining code is greatly simplified from the more general suspension | |
| 2781 // code that used to be used. | |
| 2782 // | |
| 2783 // The protocol is quite simple: | |
| 2784 // - suspend: | |
| 2785 // - sends a signal to the target thread | |
| 2786 // - polls the suspend state of the osthread using a yield loop | |
| 2787 // - target thread signal handler (SR_handler) sets suspend state | |
| 2788 // and blocks in sigsuspend until continued | |
| 2789 // - resume: | |
| 2790 // - sets target osthread state to continue | |
| 2791 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 2792 // | |
| 2793 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 2794 // | |
| 2795 | |
| 2796 static void resume_clear_context(OSThread *osthread) { | |
| 2797 osthread->set_ucontext(NULL); | |
| 2798 osthread->set_siginfo(NULL); | |
| 2799 } | |
| 2800 | |
| 2801 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 2802 osthread->set_ucontext(context); | |
| 2803 osthread->set_siginfo(siginfo); | |
| 2804 } | |
| 2805 | |
| 2806 // | |
| 2807 // Handler function invoked when a thread's execution is suspended or | |
| 2808 // resumed. We have to be careful that only async-safe functions are | |
| 2809 // called here (Note: most pthread functions are not async safe and | |
| 2810 // should be avoided.) | |
| 2811 // | |
| 2812 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 2813 // interface point of view, but sigwait() prevents the signal hander | |
| 2814 // from being run. libpthread would get very confused by not having | |
| 2815 // its signal handlers run and prevents sigwait()'s use with the | |
| 2816 // mutex granting granting signal. | |
| 2817 // | |
| 10405 | 2818 // Currently only ever called on the VMThread or JavaThread |
| 3960 | 2819 // |
| 2820 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 2821 // Save and restore errno to avoid confusing native code with EINTR | |
| 2822 // after sigsuspend. | |
| 2823 int old_errno = errno; | |
| 2824 | |
| 2825 Thread* thread = Thread::current(); | |
| 2826 OSThread* osthread = thread->osthread(); | |
| 10405 | 2827 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
| 2828 | |
| 2829 os::SuspendResume::State current = osthread->sr.state(); | |
| 2830 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
| 3960 | 2831 suspend_save_context(osthread, siginfo, context); |
| 2832 | |
| 10405 | 2833 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
| 2834 os::SuspendResume::State state = osthread->sr.suspended(); | |
| 2835 if (state == os::SuspendResume::SR_SUSPENDED) { | |
| 2836 sigset_t suspend_set; // signals for sigsuspend() | |
| 2837 | |
| 2838 // get current set of blocked signals and unblock resume signal | |
| 2839 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 2840 sigdelset(&suspend_set, SR_signum); | |
| 2841 | |
| 2842 sr_semaphore.signal(); | |
| 2843 // wait here until we are resumed | |
| 2844 while (1) { | |
| 2845 sigsuspend(&suspend_set); | |
| 2846 | |
| 2847 os::SuspendResume::State result = osthread->sr.running(); | |
| 2848 if (result == os::SuspendResume::SR_RUNNING) { | |
| 2849 sr_semaphore.signal(); | |
| 2850 break; | |
| 2851 } else if (result != os::SuspendResume::SR_SUSPENDED) { | |
| 2852 ShouldNotReachHere(); | |
| 2853 } | |
| 2854 } | |
| 2855 | |
| 2856 } else if (state == os::SuspendResume::SR_RUNNING) { | |
| 2857 // request was cancelled, continue | |
| 2858 } else { | |
| 2859 ShouldNotReachHere(); | |
| 2860 } | |
| 3960 | 2861 |
| 2862 resume_clear_context(osthread); | |
| 10405 | 2863 } else if (current == os::SuspendResume::SR_RUNNING) { |
| 2864 // request was cancelled, continue | |
| 2865 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 2866 // ignore | |
| 3960 | 2867 } else { |
| 10405 | 2868 // ignore |
| 3960 | 2869 } |
| 2870 | |
| 2871 errno = old_errno; | |
| 2872 } | |
| 2873 | |
| 2874 | |
| 2875 static int SR_initialize() { | |
| 2876 struct sigaction act; | |
| 2877 char *s; | |
| 2878 /* Get signal number to use for suspend/resume */ | |
| 2879 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 2880 int sig = ::strtol(s, 0, 10); | |
| 2881 if (sig > 0 || sig < NSIG) { | |
| 2882 SR_signum = sig; | |
| 2883 } | |
| 2884 } | |
| 2885 | |
| 2886 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 2887 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 2888 | |
| 2889 sigemptyset(&SR_sigset); | |
| 2890 sigaddset(&SR_sigset, SR_signum); | |
| 2891 | |
| 2892 /* Set up signal handler for suspend/resume */ | |
| 2893 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2894 act.sa_handler = (void (*)(int)) SR_handler; | |
| 2895 | |
| 2896 // SR_signum is blocked by default. | |
| 2897 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 2898 // supported Bsd platforms). Note that BsdThreads need to block | |
| 2899 // this signal for all threads to work properly. So we don't have | |
| 2900 // to use hard-coded signal number when setting up the mask. | |
| 2901 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 2902 | |
| 2903 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 2904 return -1; | |
| 2905 } | |
| 2906 | |
| 2907 // Save signal flag | |
| 2908 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
| 2909 return 0; | |
| 2910 } | |
| 2911 | |
| 10405 | 2912 static int sr_notify(OSThread* osthread) { |
| 2913 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 2914 assert_status(status == 0, status, "pthread_kill"); | |
| 2915 return status; | |
| 2916 } | |
| 2917 | |
| 2918 // "Randomly" selected value for how long we want to spin | |
| 2919 // before bailing out on suspending a thread, also how often | |
| 2920 // we send a signal to a thread we want to resume | |
| 2921 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
| 2922 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
| 3960 | 2923 |
| 2924 // returns true on success and false on error - really an error is fatal | |
| 2925 // but this seems the normal response to library errors | |
| 2926 static bool do_suspend(OSThread* osthread) { | |
| 10405 | 2927 assert(osthread->sr.is_running(), "thread should be running"); |
| 2928 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
| 2929 | |
| 3960 | 2930 // mark as suspended and send signal |
| 10405 | 2931 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
| 2932 // failed to switch, state wasn't running? | |
| 2933 ShouldNotReachHere(); | |
| 3960 | 2934 return false; |
| 2935 } | |
| 10405 | 2936 |
| 2937 if (sr_notify(osthread) != 0) { | |
| 2938 ShouldNotReachHere(); | |
| 2939 } | |
| 2940 | |
| 2941 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
| 2942 while (true) { | |
| 2943 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 2944 break; | |
| 2945 } else { | |
| 2946 // timeout | |
| 2947 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
| 2948 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
| 2949 return false; | |
| 2950 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
| 2951 // make sure that we consume the signal on the semaphore as well | |
| 2952 sr_semaphore.wait(); | |
| 2953 break; | |
| 2954 } else { | |
| 2955 ShouldNotReachHere(); | |
| 2956 return false; | |
| 2957 } | |
| 2958 } | |
| 2959 } | |
| 2960 | |
| 2961 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
| 2962 return true; | |
| 3960 | 2963 } |
| 2964 | |
| 2965 static void do_resume(OSThread* osthread) { | |
| 2966 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 10405 | 2967 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
| 2968 | |
| 2969 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 2970 // failed to switch to WAKEUP_REQUEST | |
| 2971 ShouldNotReachHere(); | |
| 2972 return; | |
| 2973 } | |
| 2974 | |
| 2975 while (true) { | |
| 2976 if (sr_notify(osthread) == 0) { | |
| 2977 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 2978 if (osthread->sr.is_running()) { | |
| 2979 return; | |
| 2980 } | |
| 2981 } | |
| 2982 } else { | |
| 2983 ShouldNotReachHere(); | |
| 3960 | 2984 } |
| 2985 } | |
| 10405 | 2986 |
| 2987 guarantee(osthread->sr.is_running(), "Must be running!"); | |
| 3960 | 2988 } |
| 2989 | |
| 2990 //////////////////////////////////////////////////////////////////////////////// | |
| 2991 // interrupt support | |
| 2992 | |
| 2993 void os::interrupt(Thread* thread) { | |
| 2994 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2995 "possibility of dangling Thread pointer"); | |
| 2996 | |
| 2997 OSThread* osthread = thread->osthread(); | |
| 2998 | |
| 2999 if (!osthread->interrupted()) { | |
| 3000 osthread->set_interrupted(true); | |
| 3001 // More than one thread can get here with the same value of osthread, | |
| 3002 // resulting in multiple notifications. We do, however, want the store | |
| 3003 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 3004 OrderAccess::fence(); | |
| 3005 ParkEvent * const slp = thread->_SleepEvent ; | |
| 3006 if (slp != NULL) slp->unpark() ; | |
| 3007 } | |
| 3008 | |
| 3009 // For JSR166. Unpark even if interrupt status already was set | |
| 3010 if (thread->is_Java_thread()) | |
| 3011 ((JavaThread*)thread)->parker()->unpark(); | |
| 3012 | |
| 3013 ParkEvent * ev = thread->_ParkEvent ; | |
| 3014 if (ev != NULL) ev->unpark() ; | |
| 3015 | |
| 3016 } | |
| 3017 | |
| 3018 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 3019 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 3020 "possibility of dangling Thread pointer"); | |
| 3021 | |
| 3022 OSThread* osthread = thread->osthread(); | |
| 3023 | |
| 3024 bool interrupted = osthread->interrupted(); | |
| 3025 | |
| 3026 if (interrupted && clear_interrupted) { | |
| 3027 osthread->set_interrupted(false); | |
| 3028 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 3029 } | |
| 3030 | |
| 3031 return interrupted; | |
| 3032 } | |
| 3033 | |
| 3034 /////////////////////////////////////////////////////////////////////////////////// | |
| 3035 // signal handling (except suspend/resume) | |
| 3036 | |
| 3037 // This routine may be used by user applications as a "hook" to catch signals. | |
| 3038 // The user-defined signal handler must pass unrecognized signals to this | |
| 3039 // routine, and if it returns true (non-zero), then the signal handler must | |
| 3040 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 3041 // routine will never retun false (zero), but instead will execute a VM panic | |
| 3042 // routine kill the process. | |
| 3043 // | |
| 3044 // If this routine returns false, it is OK to call it again. This allows | |
| 3045 // the user-defined signal handler to perform checks either before or after | |
| 3046 // the VM performs its own checks. Naturally, the user code would be making | |
| 3047 // a serious error if it tried to handle an exception (such as a null check | |
| 3048 // or breakpoint) that the VM was generating for its own correct operation. | |
| 3049 // | |
| 3050 // This routine may recognize any of the following kinds of signals: | |
| 3051 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 3052 // It should be consulted by handlers for any of those signals. | |
| 3053 // | |
| 3054 // The caller of this routine must pass in the three arguments supplied | |
| 3055 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 3056 // field of the structure passed to sigaction(). This routine assumes that | |
| 3057 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 3058 // | |
| 3059 // Note that the VM will print warnings if it detects conflicting signal | |
| 3060 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 3061 // | |
| 3062 extern "C" JNIEXPORT int | |
| 3063 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
| 3064 void* ucontext, int abort_if_unrecognized); | |
| 3065 | |
| 3066 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 3067 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 8067 | 3068 int orig_errno = errno; // Preserve errno value over signal handler. |
| 3960 | 3069 JVM_handle_bsd_signal(sig, info, uc, true); |
| 8067 | 3070 errno = orig_errno; |
| 3960 | 3071 } |
| 3072 | |
| 3073 | |
| 3074 // This boolean allows users to forward their own non-matching signals | |
| 3075 // to JVM_handle_bsd_signal, harmlessly. | |
| 3076 bool os::Bsd::signal_handlers_are_installed = false; | |
| 3077 | |
| 3078 // For signal-chaining | |
| 3079 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
| 3080 unsigned int os::Bsd::sigs = 0; | |
| 3081 bool os::Bsd::libjsig_is_loaded = false; | |
| 3082 typedef struct sigaction *(*get_signal_t)(int); | |
| 3083 get_signal_t os::Bsd::get_signal_action = NULL; | |
| 3084 | |
| 3085 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
| 3086 struct sigaction *actp = NULL; | |
| 3087 | |
| 3088 if (libjsig_is_loaded) { | |
| 3089 // Retrieve the old signal handler from libjsig | |
| 3090 actp = (*get_signal_action)(sig); | |
| 3091 } | |
| 3092 if (actp == NULL) { | |
| 3093 // Retrieve the preinstalled signal handler from jvm | |
| 3094 actp = get_preinstalled_handler(sig); | |
| 3095 } | |
| 3096 | |
| 3097 return actp; | |
| 3098 } | |
| 3099 | |
| 3100 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 3101 siginfo_t *siginfo, void *context) { | |
| 3102 // Call the old signal handler | |
| 3103 if (actp->sa_handler == SIG_DFL) { | |
| 3104 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 3105 // instead of taking the default action. | |
| 3106 return false; | |
| 3107 } else if (actp->sa_handler != SIG_IGN) { | |
| 3108 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 3109 // automaticlly block the signal | |
| 3110 sigaddset(&(actp->sa_mask), sig); | |
| 3111 } | |
| 3112 | |
| 3113 sa_handler_t hand; | |
| 3114 sa_sigaction_t sa; | |
| 3115 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 3116 // retrieve the chained handler | |
| 3117 if (siginfo_flag_set) { | |
| 3118 sa = actp->sa_sigaction; | |
| 3119 } else { | |
| 3120 hand = actp->sa_handler; | |
| 3121 } | |
| 3122 | |
| 3123 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 3124 actp->sa_handler = SIG_DFL; | |
| 3125 } | |
| 3126 | |
| 3127 // try to honor the signal mask | |
| 3128 sigset_t oset; | |
| 3129 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 3130 | |
| 3131 // call into the chained handler | |
| 3132 if (siginfo_flag_set) { | |
| 3133 (*sa)(sig, siginfo, context); | |
| 3134 } else { | |
| 3135 (*hand)(sig); | |
| 3136 } | |
| 3137 | |
| 3138 // restore the signal mask | |
| 3139 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 3140 } | |
| 3141 // Tell jvm's signal handler the signal is taken care of. | |
| 3142 return true; | |
| 3143 } | |
| 3144 | |
| 3145 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 3146 bool chained = false; | |
| 3147 // signal-chaining | |
| 3148 if (UseSignalChaining) { | |
| 3149 struct sigaction *actp = get_chained_signal_action(sig); | |
| 3150 if (actp != NULL) { | |
| 3151 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 3152 } | |
| 3153 } | |
| 3154 return chained; | |
| 3155 } | |
| 3156 | |
| 3157 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
| 3158 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 3159 return &sigact[sig]; | |
| 3160 } | |
| 3161 return NULL; | |
| 3162 } | |
| 3163 | |
| 3164 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 3165 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3166 sigact[sig] = oldAct; | |
| 3167 sigs |= (unsigned int)1 << sig; | |
| 3168 } | |
| 3169 | |
| 3170 // for diagnostic | |
| 3171 int os::Bsd::sigflags[MAXSIGNUM]; | |
| 3172 | |
| 3173 int os::Bsd::get_our_sigflags(int sig) { | |
| 3174 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3175 return sigflags[sig]; | |
| 3176 } | |
| 3177 | |
| 3178 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
| 3179 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3180 sigflags[sig] = flags; | |
| 3181 } | |
| 3182 | |
| 3183 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
| 3184 // Check for overwrite. | |
| 3185 struct sigaction oldAct; | |
| 3186 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 3187 | |
| 3188 void* oldhand = oldAct.sa_sigaction | |
| 3189 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3190 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3191 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 3192 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 3193 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 3194 if (AllowUserSignalHandlers || !set_installed) { | |
| 3195 // Do not overwrite; user takes responsibility to forward to us. | |
| 3196 return; | |
| 3197 } else if (UseSignalChaining) { | |
| 3198 // save the old handler in jvm | |
| 3199 save_preinstalled_handler(sig, oldAct); | |
| 3200 // libjsig also interposes the sigaction() call below and saves the | |
| 3201 // old sigaction on it own. | |
| 3202 } else { | |
| 3203 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
| 3204 "%#lx for signal %d.", (long)oldhand, sig)); | |
| 3205 } | |
| 3206 } | |
| 3207 | |
| 3208 struct sigaction sigAct; | |
| 3209 sigfillset(&(sigAct.sa_mask)); | |
| 3210 sigAct.sa_handler = SIG_DFL; | |
| 3211 if (!set_installed) { | |
| 3212 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3213 } else { | |
| 3214 sigAct.sa_sigaction = signalHandler; | |
| 3215 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3216 } | |
|
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3217 #if __APPLE__ |
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3218 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
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3219 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
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3220 // if the signal handler declares it will handle it on alternate stack. |
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3221 // Notice we only declare we will handle it on alt stack, but we are not |
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3222 // actually going to use real alt stack - this is just a workaround. |
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3223 // Please see ux_exception.c, method catch_mach_exception_raise for details |
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3224 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
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3225 if (sig == SIGSEGV) { |
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3226 sigAct.sa_flags |= SA_ONSTACK; |
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3227 } |
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3228 #endif |
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3229 |
| 3960 | 3230 // Save flags, which are set by ours |
| 3231 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3232 sigflags[sig] = sigAct.sa_flags; | |
| 3233 | |
| 3234 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 3235 assert(ret == 0, "check"); | |
| 3236 | |
| 3237 void* oldhand2 = oldAct.sa_sigaction | |
| 3238 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3239 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3240 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 3241 } | |
| 3242 | |
| 3243 // install signal handlers for signals that HotSpot needs to | |
| 3244 // handle in order to support Java-level exception handling. | |
| 3245 | |
| 3246 void os::Bsd::install_signal_handlers() { | |
| 3247 if (!signal_handlers_are_installed) { | |
| 3248 signal_handlers_are_installed = true; | |
| 3249 | |
| 3250 // signal-chaining | |
| 3251 typedef void (*signal_setting_t)(); | |
| 3252 signal_setting_t begin_signal_setting = NULL; | |
| 3253 signal_setting_t end_signal_setting = NULL; | |
| 3254 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3255 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 3256 if (begin_signal_setting != NULL) { | |
| 3257 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3258 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 3259 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 3260 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 3261 libjsig_is_loaded = true; | |
| 3262 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 3263 } | |
| 3264 if (libjsig_is_loaded) { | |
| 3265 // Tell libjsig jvm is setting signal handlers | |
| 3266 (*begin_signal_setting)(); | |
| 3267 } | |
| 3268 | |
| 3269 set_signal_handler(SIGSEGV, true); | |
| 3270 set_signal_handler(SIGPIPE, true); | |
| 3271 set_signal_handler(SIGBUS, true); | |
| 3272 set_signal_handler(SIGILL, true); | |
| 3273 set_signal_handler(SIGFPE, true); | |
| 3274 set_signal_handler(SIGXFSZ, true); | |
| 3275 | |
| 3276 #if defined(__APPLE__) | |
| 3277 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
| 3278 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
| 3279 // signal handler that's placed on our process by CrashReporter. This disables | |
| 3280 // CrashReporter-based reporting. | |
| 3281 // | |
| 3282 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
| 3283 // on caught fatal signals. | |
| 3284 // | |
| 3285 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
| 3286 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
| 3287 // exception handling, while leaving the standard BSD signal handlers functional. | |
| 3288 kern_return_t kr; | |
| 3289 kr = task_set_exception_ports(mach_task_self(), | |
| 3290 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
| 3291 MACH_PORT_NULL, | |
| 3292 EXCEPTION_STATE_IDENTITY, | |
| 3293 MACHINE_THREAD_STATE); | |
| 3294 | |
| 3295 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
| 3296 #endif | |
| 3297 | |
| 3298 if (libjsig_is_loaded) { | |
| 3299 // Tell libjsig jvm finishes setting signal handlers | |
| 3300 (*end_signal_setting)(); | |
| 3301 } | |
| 3302 | |
| 3303 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
| 3304 // and if UserSignalHandler is installed all bets are off | |
| 3305 if (CheckJNICalls) { | |
| 3306 if (libjsig_is_loaded) { | |
|
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3307 if (PrintJNIResolving) { |
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|
3308 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
|
3a57fa7a4cd0
7121403: [TESTBUG] runtime/7051189/Xchecksig.sh fails on 64bit solaris
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parents:
12095
diff
changeset
|
3309 } |
| 3960 | 3310 check_signals = false; |
| 3311 } | |
| 3312 if (AllowUserSignalHandlers) { | |
|
12096
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7121403: [TESTBUG] runtime/7051189/Xchecksig.sh fails on 64bit solaris
hseigel
parents:
12095
diff
changeset
|
3313 if (PrintJNIResolving) { |
|
3a57fa7a4cd0
7121403: [TESTBUG] runtime/7051189/Xchecksig.sh fails on 64bit solaris
hseigel
parents:
12095
diff
changeset
|
3314 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
|
3a57fa7a4cd0
7121403: [TESTBUG] runtime/7051189/Xchecksig.sh fails on 64bit solaris
hseigel
parents:
12095
diff
changeset
|
3315 } |
| 3960 | 3316 check_signals = false; |
| 3317 } | |
| 3318 } | |
| 3319 } | |
| 3320 } | |
| 3321 | |
| 3322 | |
| 3323 ///// | |
| 3324 // glibc on Bsd platform uses non-documented flag | |
| 3325 // to indicate, that some special sort of signal | |
| 3326 // trampoline is used. | |
| 3327 // We will never set this flag, and we should | |
| 3328 // ignore this flag in our diagnostic | |
| 3329 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 3330 #undef SIGNIFICANT_SIGNAL_MASK | |
| 3331 #endif | |
| 3332 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 3333 | |
| 3334 static const char* get_signal_handler_name(address handler, | |
| 3335 char* buf, int buflen) { | |
| 3336 int offset; | |
| 3337 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 3338 if (found) { | |
| 3339 // skip directory names | |
| 3340 const char *p1, *p2; | |
| 3341 p1 = buf; | |
| 3342 size_t len = strlen(os::file_separator()); | |
| 3343 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 3344 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 3345 } else { | |
| 3346 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 3347 } | |
| 3348 return buf; | |
| 3349 } | |
| 3350 | |
| 3351 static void print_signal_handler(outputStream* st, int sig, | |
| 3352 char* buf, size_t buflen) { | |
| 3353 struct sigaction sa; | |
| 3354 | |
| 3355 sigaction(sig, NULL, &sa); | |
| 3356 | |
| 3357 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 3358 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3359 | |
| 3360 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 3361 | |
| 3362 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 3363 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 3364 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 3365 | |
| 3366 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 3367 st->print("SIG_DFL"); | |
| 3368 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 3369 st->print("SIG_IGN"); | |
| 3370 } else { | |
| 3371 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 3372 } | |
| 3373 | |
| 14410 | 3374 st->print(", sa_mask[0]="); |
| 3375 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
| 3960 | 3376 |
| 3377 address rh = VMError::get_resetted_sighandler(sig); | |
| 3378 // May be, handler was resetted by VMError? | |
| 3379 if(rh != NULL) { | |
| 3380 handler = rh; | |
| 3381 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 3382 } | |
| 3383 | |
| 14410 | 3384 st->print(", sa_flags="); |
| 3385 os::Posix::print_sa_flags(st, sa.sa_flags); | |
| 3960 | 3386 |
| 3387 // Check: is it our handler? | |
| 3388 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 3389 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 3390 // It is our signal handler | |
| 3391 // check for flags, reset system-used one! | |
| 3392 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3393 st->print( | |
| 3394 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 3395 os::Bsd::get_our_sigflags(sig)); | |
| 3396 } | |
| 3397 } | |
| 3398 st->cr(); | |
| 3399 } | |
| 3400 | |
| 3401 | |
| 3402 #define DO_SIGNAL_CHECK(sig) \ | |
| 3403 if (!sigismember(&check_signal_done, sig)) \ | |
| 3404 os::Bsd::check_signal_handler(sig) | |
| 3405 | |
| 3406 // This method is a periodic task to check for misbehaving JNI applications | |
| 3407 // under CheckJNI, we can add any periodic checks here | |
| 3408 | |
| 3409 void os::run_periodic_checks() { | |
| 3410 | |
| 3411 if (check_signals == false) return; | |
| 3412 | |
| 3413 // SEGV and BUS if overridden could potentially prevent | |
| 3414 // generation of hs*.log in the event of a crash, debugging | |
| 3415 // such a case can be very challenging, so we absolutely | |
| 3416 // check the following for a good measure: | |
| 3417 DO_SIGNAL_CHECK(SIGSEGV); | |
| 3418 DO_SIGNAL_CHECK(SIGILL); | |
| 3419 DO_SIGNAL_CHECK(SIGFPE); | |
| 3420 DO_SIGNAL_CHECK(SIGBUS); | |
| 3421 DO_SIGNAL_CHECK(SIGPIPE); | |
| 3422 DO_SIGNAL_CHECK(SIGXFSZ); | |
| 3423 | |
| 3424 | |
| 3425 // ReduceSignalUsage allows the user to override these handlers | |
| 3426 // see comments at the very top and jvm_solaris.h | |
| 3427 if (!ReduceSignalUsage) { | |
| 3428 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 3429 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 3430 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 3431 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 3432 } | |
| 3433 | |
| 3434 DO_SIGNAL_CHECK(SR_signum); | |
| 3435 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 3436 } | |
| 3437 | |
| 3438 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 3439 | |
| 3440 static os_sigaction_t os_sigaction = NULL; | |
| 3441 | |
| 3442 void os::Bsd::check_signal_handler(int sig) { | |
| 3443 char buf[O_BUFLEN]; | |
| 3444 address jvmHandler = NULL; | |
| 3445 | |
| 3446 | |
| 3447 struct sigaction act; | |
| 3448 if (os_sigaction == NULL) { | |
| 3449 // only trust the default sigaction, in case it has been interposed | |
| 3450 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 3451 if (os_sigaction == NULL) return; | |
| 3452 } | |
| 3453 | |
| 3454 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 3455 | |
| 3456 | |
| 3457 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3458 | |
| 3459 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 3460 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 3461 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 3462 | |
| 3463 | |
| 3464 switch(sig) { | |
| 3465 case SIGSEGV: | |
| 3466 case SIGBUS: | |
| 3467 case SIGFPE: | |
| 3468 case SIGPIPE: | |
| 3469 case SIGILL: | |
| 3470 case SIGXFSZ: | |
| 3471 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 3472 break; | |
| 3473 | |
| 3474 case SHUTDOWN1_SIGNAL: | |
| 3475 case SHUTDOWN2_SIGNAL: | |
| 3476 case SHUTDOWN3_SIGNAL: | |
| 3477 case BREAK_SIGNAL: | |
| 3478 jvmHandler = (address)user_handler(); | |
| 3479 break; | |
| 3480 | |
| 3481 case INTERRUPT_SIGNAL: | |
| 3482 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 3483 break; | |
| 3484 | |
| 3485 default: | |
| 3486 if (sig == SR_signum) { | |
| 3487 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 3488 } else { | |
| 3489 return; | |
| 3490 } | |
| 3491 break; | |
| 3492 } | |
| 3493 | |
| 3494 if (thisHandler != jvmHandler) { | |
| 3495 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 3496 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 3497 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 3498 // No need to check this sig any longer | |
| 3499 sigaddset(&check_signal_done, sig); | |
| 3500 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3501 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 3502 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
| 3503 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 3504 // No need to check this sig any longer | |
| 3505 sigaddset(&check_signal_done, sig); | |
| 3506 } | |
| 3507 | |
| 3508 // Dump all the signal | |
| 3509 if (sigismember(&check_signal_done, sig)) { | |
| 3510 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 3511 } | |
| 3512 } | |
| 3513 | |
| 3514 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 3515 | |
| 3516 extern bool signal_name(int signo, char* buf, size_t len); | |
| 3517 | |
| 3518 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 3519 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 3520 // signal | |
| 3521 if (!signal_name(exception_code, buf, size)) { | |
| 3522 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 3523 } | |
| 3524 return buf; | |
| 3525 } else { | |
| 3526 return NULL; | |
| 3527 } | |
| 3528 } | |
| 3529 | |
| 3530 // this is called _before_ the most of global arguments have been parsed | |
| 3531 void os::init(void) { | |
| 3532 char dummy; /* used to get a guess on initial stack address */ | |
| 3533 // first_hrtime = gethrtime(); | |
| 3534 | |
| 3535 // With BsdThreads the JavaMain thread pid (primordial thread) | |
| 3536 // is different than the pid of the java launcher thread. | |
| 3537 // So, on Bsd, the launcher thread pid is passed to the VM | |
| 3538 // via the sun.java.launcher.pid property. | |
| 3539 // Use this property instead of getpid() if it was correctly passed. | |
| 3540 // See bug 6351349. | |
| 3541 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 3542 | |
| 3543 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 3544 | |
| 3545 clock_tics_per_sec = CLK_TCK; | |
| 3546 | |
| 3547 init_random(1234567); | |
| 3548 | |
| 3549 ThreadCritical::initialize(); | |
| 3550 | |
| 3551 Bsd::set_page_size(getpagesize()); | |
| 3552 if (Bsd::page_size() == -1) { | |
| 3553 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
| 3554 strerror(errno))); | |
| 3555 } | |
| 3556 init_page_sizes((size_t) Bsd::page_size()); | |
| 3557 | |
| 3558 Bsd::initialize_system_info(); | |
| 3559 | |
| 3560 // main_thread points to the aboriginal thread | |
| 3561 Bsd::_main_thread = pthread_self(); | |
| 3562 | |
| 3563 Bsd::clock_init(); | |
|
12997
e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
jbachorik
parents:
12856
diff
changeset
|
3564 initial_time_count = javaTimeNanos(); |
| 3960 | 3565 |
| 3566 #ifdef __APPLE__ | |
| 3567 // XXXDARWIN | |
| 3568 // Work around the unaligned VM callbacks in hotspot's | |
| 3569 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
| 3570 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
| 3571 // alignment when doing symbol lookup. To work around this, we force early | |
| 3572 // binding of all symbols now, thus binding when alignment is known-good. | |
| 3573 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
| 3574 #endif | |
| 3575 } | |
| 3576 | |
| 3577 // To install functions for atexit system call | |
| 3578 extern "C" { | |
| 3579 static void perfMemory_exit_helper() { | |
| 3580 perfMemory_exit(); | |
| 3581 } | |
| 3582 } | |
| 3583 | |
| 3584 // this is called _after_ the global arguments have been parsed | |
| 3585 jint os::init_2(void) | |
| 3586 { | |
| 3587 // Allocate a single page and mark it as readable for safepoint polling | |
| 3588 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3589 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 3590 | |
| 3591 os::set_polling_page( polling_page ); | |
| 3592 | |
| 3593 #ifndef PRODUCT | |
| 3594 if(Verbose && PrintMiscellaneous) | |
| 3595 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 3596 #endif | |
| 3597 | |
| 3598 if (!UseMembar) { | |
| 3599 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
|
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3600 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
| 3960 | 3601 os::set_memory_serialize_page( mem_serialize_page ); |
| 3602 | |
| 3603 #ifndef PRODUCT | |
| 3604 if(Verbose && PrintMiscellaneous) | |
| 3605 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 3606 #endif | |
| 3607 } | |
| 3608 | |
| 3609 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 3610 if (SR_initialize() != 0) { | |
| 3611 perror("SR_initialize failed"); | |
| 3612 return JNI_ERR; | |
| 3613 } | |
| 3614 | |
| 3615 Bsd::signal_sets_init(); | |
| 3616 Bsd::install_signal_handlers(); | |
| 3617 | |
| 3618 // Check minimum allowable stack size for thread creation and to initialize | |
| 3619 // the java system classes, including StackOverflowError - depends on page | |
| 3620 // size. Add a page for compiler2 recursion in main thread. | |
| 3621 // Add in 2*BytesPerWord times page size to account for VM stack during | |
| 3622 // class initialization depending on 32 or 64 bit VM. | |
| 3623 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
| 3624 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
| 3625 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
| 3626 | |
| 3627 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
| 3628 if (threadStackSizeInBytes != 0 && | |
| 3629 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
| 3630 tty->print_cr("\nThe stack size specified is too small, " | |
| 3631 "Specify at least %dk", | |
| 3632 os::Bsd::min_stack_allowed/ K); | |
| 3633 return JNI_ERR; | |
| 3634 } | |
| 3635 | |
| 3636 // Make the stack size a multiple of the page size so that | |
| 3637 // the yellow/red zones can be guarded. | |
| 3638 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 3639 vm_page_size())); | |
| 3640 | |
| 3641 if (MaxFDLimit) { | |
| 3642 // set the number of file descriptors to max. print out error | |
| 3643 // if getrlimit/setrlimit fails but continue regardless. | |
| 3644 struct rlimit nbr_files; | |
| 3645 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3646 if (status != 0) { | |
| 3647 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3648 perror("os::init_2 getrlimit failed"); | |
| 3649 } else { | |
| 3650 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 3651 | |
| 3652 #ifdef __APPLE__ | |
| 3653 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
| 3654 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
| 3655 // be used instead | |
| 3656 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
| 3657 #endif | |
| 3658 | |
| 3659 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3660 if (status != 0) { | |
| 3661 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3662 perror("os::init_2 setrlimit failed"); | |
| 3663 } | |
| 3664 } | |
| 3665 } | |
| 3666 | |
| 3667 // at-exit methods are called in the reverse order of their registration. | |
| 3668 // atexit functions are called on return from main or as a result of a | |
| 3669 // call to exit(3C). There can be only 32 of these functions registered | |
| 3670 // and atexit() does not set errno. | |
| 3671 | |
| 3672 if (PerfAllowAtExitRegistration) { | |
| 3673 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 3674 // atexit functions can be delayed until process exit time, which | |
| 3675 // can be problematic for embedded VM situations. Embedded VMs should | |
| 3676 // call DestroyJavaVM() to assure that VM resources are released. | |
| 3677 | |
| 3678 // note: perfMemory_exit_helper atexit function may be removed in | |
| 3679 // the future if the appropriate cleanup code can be added to the | |
| 3680 // VM_Exit VMOperation's doit method. | |
| 3681 if (atexit(perfMemory_exit_helper) != 0) { | |
| 3682 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
| 3683 } | |
| 3684 } | |
| 3685 | |
| 3686 // initialize thread priority policy | |
| 3687 prio_init(); | |
| 3688 | |
| 4006 | 3689 #ifdef __APPLE__ |
| 3690 // dynamically link to objective c gc registration | |
| 3691 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
| 3692 if (handleLibObjc != NULL) { | |
| 3693 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
| 3694 } | |
| 3695 #endif | |
| 3696 | |
| 3960 | 3697 return JNI_OK; |
| 3698 } | |
| 3699 | |
| 3700 // this is called at the end of vm_initialization | |
| 3701 void os::init_3(void) { } | |
| 3702 | |
| 3703 // Mark the polling page as unreadable | |
| 3704 void os::make_polling_page_unreadable(void) { | |
| 3705 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
| 3706 fatal("Could not disable polling page"); | |
| 3707 }; | |
| 3708 | |
| 3709 // Mark the polling page as readable | |
| 3710 void os::make_polling_page_readable(void) { | |
| 3711 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
| 3712 fatal("Could not enable polling page"); | |
| 3713 } | |
| 3714 }; | |
| 3715 | |
| 3716 int os::active_processor_count() { | |
| 3717 return _processor_count; | |
| 3718 } | |
| 3719 | |
| 4006 | 3720 void os::set_native_thread_name(const char *name) { |
| 3721 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
| 3722 // This is only supported in Snow Leopard and beyond | |
| 3723 if (name != NULL) { | |
| 3724 // Add a "Java: " prefix to the name | |
| 3725 char buf[MAXTHREADNAMESIZE]; | |
| 3726 snprintf(buf, sizeof(buf), "Java: %s", name); | |
| 3727 pthread_setname_np(buf); | |
| 3728 } | |
| 3729 #endif | |
| 3730 } | |
| 3731 | |
| 3960 | 3732 bool os::distribute_processes(uint length, uint* distribution) { |
| 3733 // Not yet implemented. | |
| 3734 return false; | |
| 3735 } | |
| 3736 | |
| 3737 bool os::bind_to_processor(uint processor_id) { | |
| 3738 // Not yet implemented. | |
| 3739 return false; | |
| 3740 } | |
| 3741 | |
| 10405 | 3742 void os::SuspendedThreadTask::internal_do_task() { |
| 3743 if (do_suspend(_thread->osthread())) { | |
| 3744 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
| 3745 do_task(context); | |
| 3746 do_resume(_thread->osthread()); | |
| 3747 } | |
| 3748 } | |
| 3749 | |
| 3960 | 3750 /// |
| 10405 | 3751 class PcFetcher : public os::SuspendedThreadTask { |
| 3752 public: | |
| 3753 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
| 3754 ExtendedPC result(); | |
| 3755 protected: | |
| 3756 void do_task(const os::SuspendedThreadTaskContext& context); | |
| 3757 private: | |
| 3758 ExtendedPC _epc; | |
| 3759 }; | |
| 3760 | |
| 3761 ExtendedPC PcFetcher::result() { | |
| 3762 guarantee(is_done(), "task is not done yet."); | |
| 3763 return _epc; | |
| 3764 } | |
| 3765 | |
| 3766 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
| 3767 Thread* thread = context.thread(); | |
| 3768 OSThread* osthread = thread->osthread(); | |
| 3769 if (osthread->ucontext() != NULL) { | |
| 3770 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
| 3771 } else { | |
| 3772 // NULL context is unexpected, double-check this is the VMThread | |
| 3773 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 3774 } | |
| 3775 } | |
| 3960 | 3776 |
| 3777 // Suspends the target using the signal mechanism and then grabs the PC before | |
| 3778 // resuming the target. Used by the flat-profiler only | |
| 3779 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 3780 // Make sure that it is called by the watcher for the VMThread | |
| 3781 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 3782 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 3783 | |
| 10405 | 3784 PcFetcher fetcher(thread); |
| 3785 fetcher.run(); | |
| 3786 return fetcher.result(); | |
| 3960 | 3787 } |
| 3788 | |
| 3789 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 3790 { | |
| 3791 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 3792 } | |
| 3793 | |
| 3794 //////////////////////////////////////////////////////////////////////////////// | |
| 3795 // debug support | |
| 3796 | |
| 3797 bool os::find(address addr, outputStream* st) { | |
| 3798 Dl_info dlinfo; | |
| 3799 memset(&dlinfo, 0, sizeof(dlinfo)); | |
|
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|
3800 if (dladdr(addr, &dlinfo) != 0) { |
| 3960 | 3801 st->print(PTR_FORMAT ": ", addr); |
|
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|
3802 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
| 3960 | 3803 st->print("%s+%#x", dlinfo.dli_sname, |
| 3804 addr - (intptr_t)dlinfo.dli_saddr); | |
|
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|
3805 } else if (dlinfo.dli_fbase != NULL) { |
| 3960 | 3806 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
| 3807 } else { | |
| 3808 st->print("<absolute address>"); | |
| 3809 } | |
|
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|
3810 if (dlinfo.dli_fname != NULL) { |
| 3960 | 3811 st->print(" in %s", dlinfo.dli_fname); |
| 3812 } | |
|
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|
3813 if (dlinfo.dli_fbase != NULL) { |
| 3960 | 3814 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
| 3815 } | |
| 3816 st->cr(); | |
| 3817 | |
| 3818 if (Verbose) { | |
| 3819 // decode some bytes around the PC | |
|
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|
3820 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
|
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|
3821 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
| 3960 | 3822 address lowest = (address) dlinfo.dli_sname; |
| 3823 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 3824 if (begin < lowest) begin = lowest; | |
| 3825 Dl_info dlinfo2; | |
|
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|
3826 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
| 3960 | 3827 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
| 3828 end = (address) dlinfo2.dli_saddr; | |
| 3829 Disassembler::decode(begin, end, st); | |
| 3830 } | |
| 3831 return true; | |
| 3832 } | |
| 3833 return false; | |
| 3834 } | |
| 3835 | |
| 3836 //////////////////////////////////////////////////////////////////////////////// | |
| 3837 // misc | |
| 3838 | |
| 3839 // This does not do anything on Bsd. This is basically a hook for being | |
| 3840 // able to use structured exception handling (thread-local exception filters) | |
| 3841 // on, e.g., Win32. | |
| 3842 void | |
| 3843 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 3844 JavaCallArguments* args, Thread* thread) { | |
| 3845 f(value, method, args, thread); | |
| 3846 } | |
| 3847 | |
| 3848 void os::print_statistics() { | |
| 3849 } | |
| 3850 | |
| 3851 int os::message_box(const char* title, const char* message) { | |
| 3852 int i; | |
| 3853 fdStream err(defaultStream::error_fd()); | |
| 3854 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3855 err.cr(); | |
| 3856 err.print_raw_cr(title); | |
| 3857 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 3858 err.cr(); | |
| 3859 err.print_raw_cr(message); | |
| 3860 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3861 err.cr(); | |
| 3862 | |
| 3863 char buf[16]; | |
| 3864 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 3865 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 3866 | |
| 3867 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 3868 } | |
| 3869 | |
| 3870 int os::stat(const char *path, struct stat *sbuf) { | |
| 3871 char pathbuf[MAX_PATH]; | |
| 3872 if (strlen(path) > MAX_PATH - 1) { | |
| 3873 errno = ENAMETOOLONG; | |
| 3874 return -1; | |
| 3875 } | |
| 3876 os::native_path(strcpy(pathbuf, path)); | |
| 3877 return ::stat(pathbuf, sbuf); | |
| 3878 } | |
| 3879 | |
| 3880 bool os::check_heap(bool force) { | |
| 3881 return true; | |
| 3882 } | |
| 3883 | |
| 3884 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 3885 return ::vsnprintf(buf, count, format, args); | |
| 3886 } | |
| 3887 | |
| 3888 // Is a (classpath) directory empty? | |
| 3889 bool os::dir_is_empty(const char* path) { | |
| 3890 DIR *dir = NULL; | |
| 3891 struct dirent *ptr; | |
| 3892 | |
| 3893 dir = opendir(path); | |
| 3894 if (dir == NULL) return true; | |
| 3895 | |
| 3896 /* Scan the directory */ | |
| 3897 bool result = true; | |
| 3898 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 3899 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 3900 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 3901 result = false; | |
| 3902 } | |
| 3903 } | |
| 3904 closedir(dir); | |
| 3905 return result; | |
| 3906 } | |
| 3907 | |
| 3908 // This code originates from JDK's sysOpen and open64_w | |
| 3909 // from src/solaris/hpi/src/system_md.c | |
| 3910 | |
| 3911 #ifndef O_DELETE | |
| 3912 #define O_DELETE 0x10000 | |
| 3913 #endif | |
| 3914 | |
| 3915 // Open a file. Unlink the file immediately after open returns | |
| 3916 // if the specified oflag has the O_DELETE flag set. | |
| 3917 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
| 3918 | |
| 3919 int os::open(const char *path, int oflag, int mode) { | |
| 3920 | |
| 3921 if (strlen(path) > MAX_PATH - 1) { | |
| 3922 errno = ENAMETOOLONG; | |
| 3923 return -1; | |
| 3924 } | |
| 3925 int fd; | |
| 3926 int o_delete = (oflag & O_DELETE); | |
| 3927 oflag = oflag & ~O_DELETE; | |
| 3928 | |
| 3929 fd = ::open(path, oflag, mode); | |
| 3930 if (fd == -1) return -1; | |
| 3931 | |
| 3932 //If the open succeeded, the file might still be a directory | |
| 3933 { | |
| 3934 struct stat buf; | |
| 3935 int ret = ::fstat(fd, &buf); | |
| 3936 int st_mode = buf.st_mode; | |
| 3937 | |
| 3938 if (ret != -1) { | |
| 3939 if ((st_mode & S_IFMT) == S_IFDIR) { | |
| 3940 errno = EISDIR; | |
| 3941 ::close(fd); | |
| 3942 return -1; | |
| 3943 } | |
| 3944 } else { | |
| 3945 ::close(fd); | |
| 3946 return -1; | |
| 3947 } | |
| 3948 } | |
| 3949 | |
| 3950 /* | |
| 3951 * All file descriptors that are opened in the JVM and not | |
| 3952 * specifically destined for a subprocess should have the | |
| 3953 * close-on-exec flag set. If we don't set it, then careless 3rd | |
| 3954 * party native code might fork and exec without closing all | |
| 3955 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
| 3956 * UNIXProcess.c), and this in turn might: | |
| 3957 * | |
| 3958 * - cause end-of-file to fail to be detected on some file | |
| 3959 * descriptors, resulting in mysterious hangs, or | |
| 3960 * | |
| 3961 * - might cause an fopen in the subprocess to fail on a system | |
| 3962 * suffering from bug 1085341. | |
| 3963 * | |
| 3964 * (Yes, the default setting of the close-on-exec flag is a Unix | |
| 3965 * design flaw) | |
| 3966 * | |
| 3967 * See: | |
| 3968 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
| 3969 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
| 3970 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
| 3971 */ | |
| 3972 #ifdef FD_CLOEXEC | |
| 3973 { | |
| 3974 int flags = ::fcntl(fd, F_GETFD); | |
| 3975 if (flags != -1) | |
| 3976 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
| 3977 } | |
| 3978 #endif | |
| 3979 | |
| 3980 if (o_delete != 0) { | |
| 3981 ::unlink(path); | |
| 3982 } | |
| 3983 return fd; | |
| 3984 } | |
| 3985 | |
| 3986 | |
| 3987 // create binary file, rewriting existing file if required | |
| 3988 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 3989 int oflags = O_WRONLY | O_CREAT; | |
| 3990 if (!rewrite_existing) { | |
| 3991 oflags |= O_EXCL; | |
| 3992 } | |
| 3993 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
| 3994 } | |
| 3995 | |
| 3996 // return current position of file pointer | |
| 3997 jlong os::current_file_offset(int fd) { | |
| 3998 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
| 3999 } | |
| 4000 | |
| 4001 // move file pointer to the specified offset | |
| 4002 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 4003 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
| 4004 } | |
| 4005 | |
| 4006 // This code originates from JDK's sysAvailable | |
| 4007 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
| 4008 | |
| 4009 int os::available(int fd, jlong *bytes) { | |
| 4010 jlong cur, end; | |
| 4011 int mode; | |
| 4012 struct stat buf; | |
| 4013 | |
| 4014 if (::fstat(fd, &buf) >= 0) { | |
| 4015 mode = buf.st_mode; | |
| 4016 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
| 4017 /* | |
| 4018 * XXX: is the following call interruptible? If so, this might | |
| 4019 * need to go through the INTERRUPT_IO() wrapper as for other | |
| 4020 * blocking, interruptible calls in this file. | |
| 4021 */ | |
| 4022 int n; | |
| 4023 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
| 4024 *bytes = n; | |
| 4025 return 1; | |
| 4026 } | |
| 4027 } | |
| 4028 } | |
| 4029 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
| 4030 return 0; | |
| 4031 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
| 4032 return 0; | |
| 4033 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
| 4034 return 0; | |
| 4035 } | |
| 4036 *bytes = end - cur; | |
| 4037 return 1; | |
| 4038 } | |
| 4039 | |
| 4040 int os::socket_available(int fd, jint *pbytes) { | |
| 4041 if (fd < 0) | |
| 4042 return OS_OK; | |
| 4043 | |
| 4044 int ret; | |
| 4045 | |
| 4046 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
| 4047 | |
| 4048 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
| 4049 // is expected to return 0 on failure and 1 on success to the jdk. | |
| 4050 | |
| 4051 return (ret == OS_ERR) ? 0 : 1; | |
| 4052 } | |
| 4053 | |
| 4054 // Map a block of memory. | |
| 6197 | 4055 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 4056 char *addr, size_t bytes, bool read_only, |
| 4057 bool allow_exec) { | |
| 4058 int prot; | |
| 4059 int flags; | |
| 4060 | |
| 4061 if (read_only) { | |
| 4062 prot = PROT_READ; | |
| 4063 flags = MAP_SHARED; | |
| 4064 } else { | |
| 4065 prot = PROT_READ | PROT_WRITE; | |
| 4066 flags = MAP_PRIVATE; | |
| 4067 } | |
| 4068 | |
| 4069 if (allow_exec) { | |
| 4070 prot |= PROT_EXEC; | |
| 4071 } | |
| 4072 | |
| 4073 if (addr != NULL) { | |
| 4074 flags |= MAP_FIXED; | |
| 4075 } | |
| 4076 | |
| 4077 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 4078 fd, file_offset); | |
| 4079 if (mapped_address == MAP_FAILED) { | |
| 4080 return NULL; | |
| 4081 } | |
| 4082 return mapped_address; | |
| 4083 } | |
| 4084 | |
| 4085 | |
| 4086 // Remap a block of memory. | |
| 6197 | 4087 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 4088 char *addr, size_t bytes, bool read_only, |
| 4089 bool allow_exec) { | |
| 4090 // same as map_memory() on this OS | |
| 4091 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 4092 allow_exec); | |
| 4093 } | |
| 4094 | |
| 4095 | |
| 4096 // Unmap a block of memory. | |
| 6197 | 4097 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 3960 | 4098 return munmap(addr, bytes) == 0; |
| 4099 } | |
| 4100 | |
| 4101 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 4102 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 4103 // of a thread. | |
| 4104 // | |
| 4105 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 4106 // the fast estimate available on the platform. | |
| 4107 | |
| 4108 jlong os::current_thread_cpu_time() { | |
| 4109 #ifdef __APPLE__ | |
| 4110 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
|
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|
4111 #else |
|
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|
4112 Unimplemented(); |
|
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|
4113 return 0; |
| 3960 | 4114 #endif |
| 4115 } | |
| 4116 | |
| 4117 jlong os::thread_cpu_time(Thread* thread) { | |
|
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|
4118 #ifdef __APPLE__ |
|
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|
4119 return os::thread_cpu_time(thread, true /* user + sys */); |
|
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|
4120 #else |
|
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|
4121 Unimplemented(); |
|
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|
4122 return 0; |
|
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|
4123 #endif |
| 3960 | 4124 } |
| 4125 | |
| 4126 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 4127 #ifdef __APPLE__ | |
| 4128 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
|
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|
4129 #else |
|
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|
4130 Unimplemented(); |
|
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|
4131 return 0; |
| 3960 | 4132 #endif |
| 4133 } | |
| 4134 | |
| 4135 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 4136 #ifdef __APPLE__ | |
| 4137 struct thread_basic_info tinfo; | |
| 4138 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
| 4139 kern_return_t kr; | |
|
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|
4140 thread_t mach_thread; |
|
0368109684cb
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|
4141 |
|
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|
4142 mach_thread = thread->osthread()->thread_id(); |
| 3960 | 4143 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
| 4144 if (kr != KERN_SUCCESS) | |
| 4145 return -1; | |
| 4146 | |
| 4147 if (user_sys_cpu_time) { | |
| 4148 jlong nanos; | |
| 4149 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
| 4150 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
| 4151 return nanos; | |
| 4152 } else { | |
| 4153 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
| 4154 } | |
|
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|
4155 #else |
|
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|
4156 Unimplemented(); |
|
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|
4157 return 0; |
| 3960 | 4158 #endif |
| 4159 } | |
| 4160 | |
| 4161 | |
| 4162 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 4163 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 4164 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 4165 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 4166 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 4167 } | |
| 4168 | |
| 4169 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 4170 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 4171 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 4172 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 4173 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 4174 } | |
| 4175 | |
| 4176 bool os::is_thread_cpu_time_supported() { | |
| 4177 #ifdef __APPLE__ | |
| 4178 return true; | |
| 6918 | 4179 #else |
| 3960 | 4180 return false; |
| 4181 #endif | |
| 4182 } | |
| 4183 | |
| 4184 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 4185 // Bsd doesn't yet have a (official) notion of processor sets, | |
| 4186 // so just return the system wide load average. | |
| 4187 int os::loadavg(double loadavg[], int nelem) { | |
| 4188 return ::getloadavg(loadavg, nelem); | |
| 4189 } | |
| 4190 | |
| 4191 void os::pause() { | |
| 4192 char filename[MAX_PATH]; | |
| 4193 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 4194 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 4195 } else { | |
| 4196 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 4197 } | |
| 4198 | |
| 4199 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 4200 if (fd != -1) { | |
| 4201 struct stat buf; | |
| 4202 ::close(fd); | |
| 4203 while (::stat(filename, &buf) == 0) { | |
| 4204 (void)::poll(NULL, 0, 100); | |
| 4205 } | |
| 4206 } else { | |
| 4207 jio_fprintf(stderr, | |
| 4208 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 4209 } | |
| 4210 } | |
| 4211 | |
| 4212 | |
| 4213 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 4214 // | |
| 4215 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 4216 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 4217 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 4218 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 4219 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 4220 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 4221 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 4222 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 4223 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 4224 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 4225 // of libpthread avoids the problem, but isn't practical. | |
| 4226 // | |
| 4227 // Possible remedies: | |
| 4228 // | |
| 4229 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 4230 // This is palliative and probabilistic, however. If the thread is preempted | |
| 4231 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 4232 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 4233 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 4234 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 4235 // | |
| 4236 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 4237 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 4238 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 4239 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 4240 // thread. | |
| 4241 // | |
| 4242 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 4243 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 4244 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 4245 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 4246 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 4247 // timers in a graceful fashion. | |
| 4248 // | |
| 4249 // 4. When the abstime value is in the past it appears that control returns | |
| 4250 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 4251 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 4252 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 4253 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 4254 // It may be possible to avoid reinitialization by checking the return | |
| 4255 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 4256 // condvar we must establish the invariant that cond_signal() is only called | |
| 4257 // within critical sections protected by the adjunct mutex. This prevents | |
| 4258 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 4259 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 4260 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 4261 // | |
| 4262 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 4263 // structure when a condvar is used or initialized. cond_destroy() would | |
| 4264 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 4265 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 4266 // | |
| 4267 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 4268 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 4269 // and only enabling the work-around for vulnerable environments. | |
| 4270 | |
| 4271 // utility to compute the abstime argument to timedwait: | |
| 4272 // millis is the relative timeout time | |
| 4273 // abstime will be the absolute timeout time | |
| 4274 // TODO: replace compute_abstime() with unpackTime() | |
| 4275 | |
| 4276 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
| 4277 if (millis < 0) millis = 0; | |
| 4278 struct timeval now; | |
| 4279 int status = gettimeofday(&now, NULL); | |
| 4280 assert(status == 0, "gettimeofday"); | |
| 4281 jlong seconds = millis / 1000; | |
| 4282 millis %= 1000; | |
| 4283 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 4284 seconds = 50000000; | |
| 4285 } | |
| 4286 abstime->tv_sec = now.tv_sec + seconds; | |
| 4287 long usec = now.tv_usec + millis * 1000; | |
| 4288 if (usec >= 1000000) { | |
| 4289 abstime->tv_sec += 1; | |
| 4290 usec -= 1000000; | |
| 4291 } | |
| 4292 abstime->tv_nsec = usec * 1000; | |
| 4293 return abstime; | |
| 4294 } | |
| 4295 | |
| 4296 | |
| 4297 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 4298 // Conceptually TryPark() should be equivalent to park(0). | |
| 4299 | |
| 4300 int os::PlatformEvent::TryPark() { | |
| 4301 for (;;) { | |
| 4302 const int v = _Event ; | |
| 4303 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 4304 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 4305 } | |
| 4306 } | |
| 4307 | |
| 4308 void os::PlatformEvent::park() { // AKA "down()" | |
| 4309 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 4310 // may call park(). | |
| 4311 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 4312 int v ; | |
| 4313 for (;;) { | |
| 4314 v = _Event ; | |
| 4315 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4316 } | |
| 4317 guarantee (v >= 0, "invariant") ; | |
| 4318 if (v == 0) { | |
| 4319 // Do this the hard way by blocking ... | |
| 4320 int status = pthread_mutex_lock(_mutex); | |
| 4321 assert_status(status == 0, status, "mutex_lock"); | |
| 4322 guarantee (_nParked == 0, "invariant") ; | |
| 4323 ++ _nParked ; | |
| 4324 while (_Event < 0) { | |
| 4325 status = pthread_cond_wait(_cond, _mutex); | |
| 4326 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 4327 // Treat this the same as if the wait was interrupted | |
| 4328 if (status == ETIMEDOUT) { status = EINTR; } | |
| 4329 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 4330 } | |
| 4331 -- _nParked ; | |
| 4332 | |
| 4333 _Event = 0 ; | |
| 4334 status = pthread_mutex_unlock(_mutex); | |
| 4335 assert_status(status == 0, status, "mutex_unlock"); | |
|
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4336 // Paranoia to ensure our locked and lock-free paths interact |
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4337 // correctly with each other. |
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4338 OrderAccess::fence(); |
| 3960 | 4339 } |
| 4340 guarantee (_Event >= 0, "invariant") ; | |
| 4341 } | |
| 4342 | |
| 4343 int os::PlatformEvent::park(jlong millis) { | |
| 4344 guarantee (_nParked == 0, "invariant") ; | |
| 4345 | |
| 4346 int v ; | |
| 4347 for (;;) { | |
| 4348 v = _Event ; | |
| 4349 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4350 } | |
| 4351 guarantee (v >= 0, "invariant") ; | |
| 4352 if (v != 0) return OS_OK ; | |
| 4353 | |
| 4354 // We do this the hard way, by blocking the thread. | |
| 4355 // Consider enforcing a minimum timeout value. | |
| 4356 struct timespec abst; | |
| 4357 compute_abstime(&abst, millis); | |
| 4358 | |
| 4359 int ret = OS_TIMEOUT; | |
| 4360 int status = pthread_mutex_lock(_mutex); | |
| 4361 assert_status(status == 0, status, "mutex_lock"); | |
| 4362 guarantee (_nParked == 0, "invariant") ; | |
| 4363 ++_nParked ; | |
| 4364 | |
| 4365 // Object.wait(timo) will return because of | |
| 4366 // (a) notification | |
| 4367 // (b) timeout | |
| 4368 // (c) thread.interrupt | |
| 4369 // | |
| 4370 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 4371 // That is, we treat thread.interrupt as a special case of notification. | |
| 4372 // The underlying Solaris implementation, cond_timedwait, admits | |
| 4373 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 4374 // JVM from making those visible to Java code. As such, we must | |
| 4375 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 4376 // | |
| 4377 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 4378 // In that case, we should propagate the notify to another waiter. | |
| 4379 | |
| 4380 while (_Event < 0) { | |
| 4381 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 4382 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4383 pthread_cond_destroy (_cond); | |
| 4384 pthread_cond_init (_cond, NULL) ; | |
| 4385 } | |
| 4386 assert_status(status == 0 || status == EINTR || | |
| 4387 status == ETIMEDOUT, | |
| 4388 status, "cond_timedwait"); | |
| 4389 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 4390 if (status == ETIMEDOUT) break ; | |
| 4391 // We consume and ignore EINTR and spurious wakeups. | |
| 4392 } | |
| 4393 --_nParked ; | |
| 4394 if (_Event >= 0) { | |
| 4395 ret = OS_OK; | |
| 4396 } | |
| 4397 _Event = 0 ; | |
| 4398 status = pthread_mutex_unlock(_mutex); | |
| 4399 assert_status(status == 0, status, "mutex_unlock"); | |
| 4400 assert (_nParked == 0, "invariant") ; | |
|
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4401 // Paranoia to ensure our locked and lock-free paths interact |
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4402 // correctly with each other. |
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4403 OrderAccess::fence(); |
| 3960 | 4404 return ret; |
| 4405 } | |
| 4406 | |
| 4407 void os::PlatformEvent::unpark() { | |
|
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4408 // Transitions for _Event: |
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4409 // 0 :=> 1 |
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4410 // 1 :=> 1 |
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4411 // -1 :=> either 0 or 1; must signal target thread |
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4412 // That is, we can safely transition _Event from -1 to either |
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4413 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4414 // unpark() calls. |
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4415 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4416 // |
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4417 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4418 // that it will take two back-to-back park() calls for the owning |
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4419 // thread to block. This has the benefit of forcing a spurious return |
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4420 // from the first park() call after an unpark() call which will help |
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4421 // shake out uses of park() and unpark() without condition variables. |
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4422 |
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4423 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4424 |
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4425 // Wait for the thread associated with the event to vacate |
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4426 int status = pthread_mutex_lock(_mutex); |
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4427 assert_status(status == 0, status, "mutex_lock"); |
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4428 int AnyWaiters = _nParked; |
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4429 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4430 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4431 AnyWaiters = 0; |
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4432 pthread_cond_signal(_cond); |
| 3960 | 4433 } |
|
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4434 status = pthread_mutex_unlock(_mutex); |
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4435 assert_status(status == 0, status, "mutex_unlock"); |
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4436 if (AnyWaiters != 0) { |
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4437 status = pthread_cond_signal(_cond); |
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4438 assert_status(status == 0, status, "cond_signal"); |
| 3960 | 4439 } |
| 4440 | |
| 4441 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 4442 // This is safe and avoids a common class of futile wakeups. In rare | |
| 4443 // circumstances this can cause a thread to return prematurely from | |
| 4444 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 4445 // simply re-test the condition and re-park itself. | |
| 4446 } | |
| 4447 | |
| 4448 | |
| 4449 // JSR166 | |
| 4450 // ------------------------------------------------------- | |
| 4451 | |
| 4452 /* | |
| 4453 * The solaris and bsd implementations of park/unpark are fairly | |
| 4454 * conservative for now, but can be improved. They currently use a | |
| 4455 * mutex/condvar pair, plus a a count. | |
| 4456 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 4457 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 4458 * on the condvar. Contention seen when trying to park implies that someone | |
| 4459 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 4460 * is no need to track notifications. | |
| 4461 */ | |
| 4462 | |
| 4463 #define MAX_SECS 100000000 | |
| 4464 /* | |
| 4465 * This code is common to bsd and solaris and will be moved to a | |
| 4466 * common place in dolphin. | |
| 4467 * | |
| 4468 * The passed in time value is either a relative time in nanoseconds | |
| 4469 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 4470 * into suitable seconds and nanoseconds components and stored in the | |
| 4471 * given timespec structure. | |
| 4472 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 4473 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
| 4474 * overflow if times way in the future are given. Further on Solaris versions | |
| 4475 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 4476 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 4477 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 4478 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 4479 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 4480 * years from "now". | |
| 4481 */ | |
| 4482 | |
| 4483 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
| 4484 assert (time > 0, "convertTime"); | |
| 4485 | |
| 4486 struct timeval now; | |
| 4487 int status = gettimeofday(&now, NULL); | |
| 4488 assert(status == 0, "gettimeofday"); | |
| 4489 | |
| 4490 time_t max_secs = now.tv_sec + MAX_SECS; | |
| 4491 | |
| 4492 if (isAbsolute) { | |
| 4493 jlong secs = time / 1000; | |
| 4494 if (secs > max_secs) { | |
| 4495 absTime->tv_sec = max_secs; | |
| 4496 } | |
| 4497 else { | |
| 4498 absTime->tv_sec = secs; | |
| 4499 } | |
| 4500 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
| 4501 } | |
| 4502 else { | |
| 4503 jlong secs = time / NANOSECS_PER_SEC; | |
| 4504 if (secs >= MAX_SECS) { | |
| 4505 absTime->tv_sec = max_secs; | |
| 4506 absTime->tv_nsec = 0; | |
| 4507 } | |
| 4508 else { | |
| 4509 absTime->tv_sec = now.tv_sec + secs; | |
| 4510 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
| 4511 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
| 4512 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 4513 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 4514 } | |
| 4515 } | |
| 4516 } | |
| 4517 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 4518 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 4519 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 4520 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 4521 } | |
| 4522 | |
| 4523 void Parker::park(bool isAbsolute, jlong time) { | |
|
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4524 // Ideally we'd do something useful while spinning, such |
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4525 // as calling unpackTime(). |
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4526 |
| 3960 | 4527 // Optional fast-path check: |
| 4528 // Return immediately if a permit is available. | |
|
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4529 // We depend on Atomic::xchg() having full barrier semantics |
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4530 // since we are doing a lock-free update to _counter. |
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|
4531 if (Atomic::xchg(0, &_counter) > 0) return; |
| 3960 | 4532 |
| 4533 Thread* thread = Thread::current(); | |
| 4534 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 4535 JavaThread *jt = (JavaThread *)thread; | |
| 4536 | |
| 4537 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 4538 // Check interrupt before trying to wait | |
| 4539 if (Thread::is_interrupted(thread, false)) { | |
| 4540 return; | |
| 4541 } | |
| 4542 | |
| 4543 // Next, demultiplex/decode time arguments | |
| 4544 struct timespec absTime; | |
| 4545 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
| 4546 return; | |
| 4547 } | |
| 4548 if (time > 0) { | |
| 4549 unpackTime(&absTime, isAbsolute, time); | |
| 4550 } | |
| 4551 | |
| 4552 | |
| 4553 // Enter safepoint region | |
| 4554 // Beware of deadlocks such as 6317397. | |
| 4555 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 4556 // In particular a thread must never block on the Threads_lock while | |
| 4557 // holding the Parker:: mutex. If safepoints are pending both the | |
| 4558 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 4559 ThreadBlockInVM tbivm(jt); | |
| 4560 | |
| 4561 // Don't wait if cannot get lock since interference arises from | |
| 4562 // unblocking. Also. check interrupt before trying wait | |
| 4563 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 4564 return; | |
| 4565 } | |
| 4566 | |
| 4567 int status ; | |
| 4568 if (_counter > 0) { // no wait needed | |
| 4569 _counter = 0; | |
| 4570 status = pthread_mutex_unlock(_mutex); | |
| 4571 assert (status == 0, "invariant") ; | |
|
7629
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diff
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|
4572 // Paranoia to ensure our locked and lock-free paths interact |
|
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7626
diff
changeset
|
4573 // correctly with each other and Java-level accesses. |
| 3960 | 4574 OrderAccess::fence(); |
| 4575 return; | |
| 4576 } | |
| 4577 | |
| 4578 #ifdef ASSERT | |
| 4579 // Don't catch signals while blocked; let the running threads have the signals. | |
| 4580 // (This allows a debugger to break into the running thread.) | |
| 4581 sigset_t oldsigs; | |
| 4582 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
| 4583 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 4584 #endif | |
| 4585 | |
| 4586 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 4587 jt->set_suspend_equivalent(); | |
| 4588 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 4589 | |
| 4590 if (time == 0) { | |
| 4591 status = pthread_cond_wait (_cond, _mutex) ; | |
| 4592 } else { | |
| 4593 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
| 4594 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4595 pthread_cond_destroy (_cond) ; | |
| 4596 pthread_cond_init (_cond, NULL); | |
| 4597 } | |
| 4598 } | |
| 4599 assert_status(status == 0 || status == EINTR || | |
| 4600 status == ETIMEDOUT, | |
| 4601 status, "cond_timedwait"); | |
| 4602 | |
| 4603 #ifdef ASSERT | |
| 4604 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 4605 #endif | |
| 4606 | |
| 4607 _counter = 0 ; | |
| 4608 status = pthread_mutex_unlock(_mutex) ; | |
| 4609 assert_status(status == 0, status, "invariant") ; | |
|
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|
4610 // Paranoia to ensure our locked and lock-free paths interact |
|
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7626
diff
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|
4611 // correctly with each other and Java-level accesses. |
|
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7626
diff
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|
4612 OrderAccess::fence(); |
|
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|
4613 |
| 3960 | 4614 // If externally suspended while waiting, re-suspend |
| 4615 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 4616 jt->java_suspend_self(); | |
| 4617 } | |
| 4618 } | |
| 4619 | |
| 4620 void Parker::unpark() { | |
| 4621 int s, status ; | |
| 4622 status = pthread_mutex_lock(_mutex); | |
| 4623 assert (status == 0, "invariant") ; | |
| 4624 s = _counter; | |
| 4625 _counter = 1; | |
| 4626 if (s < 1) { | |
| 4627 if (WorkAroundNPTLTimedWaitHang) { | |
| 4628 status = pthread_cond_signal (_cond) ; | |
| 4629 assert (status == 0, "invariant") ; | |
| 4630 status = pthread_mutex_unlock(_mutex); | |
| 4631 assert (status == 0, "invariant") ; | |
| 4632 } else { | |
| 4633 status = pthread_mutex_unlock(_mutex); | |
| 4634 assert (status == 0, "invariant") ; | |
| 4635 status = pthread_cond_signal (_cond) ; | |
| 4636 assert (status == 0, "invariant") ; | |
| 4637 } | |
| 4638 } else { | |
| 4639 pthread_mutex_unlock(_mutex); | |
| 4640 assert (status == 0, "invariant") ; | |
| 4641 } | |
| 4642 } | |
| 4643 | |
| 4644 | |
| 4645 /* Darwin has no "environ" in a dynamic library. */ | |
| 4646 #ifdef __APPLE__ | |
| 4647 #include <crt_externs.h> | |
| 4648 #define environ (*_NSGetEnviron()) | |
| 4649 #else | |
| 4650 extern char** environ; | |
| 4651 #endif | |
| 4652 | |
| 4653 // Run the specified command in a separate process. Return its exit value, | |
| 4654 // or -1 on failure (e.g. can't fork a new process). | |
| 4655 // Unlike system(), this function can be called from signal handler. It | |
| 4656 // doesn't block SIGINT et al. | |
| 4657 int os::fork_and_exec(char* cmd) { | |
| 4658 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
| 4659 | |
| 4660 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
| 4661 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 4662 // separate process to execve. Make a direct syscall to fork process. | |
| 4663 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 4664 // the best... | |
| 4665 pid_t pid = fork(); | |
| 4666 | |
| 4667 if (pid < 0) { | |
| 4668 // fork failed | |
| 4669 return -1; | |
| 4670 | |
| 4671 } else if (pid == 0) { | |
| 4672 // child process | |
| 4673 | |
| 4674 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
| 4675 // first to kill every thread on the thread list. Because this list is | |
| 4676 // not reset by fork() (see notes above), execve() will instead kill | |
| 4677 // every thread in the parent process. We know this is the only thread | |
| 4678 // in the new process, so make a system call directly. | |
| 4679 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 4680 // above. | |
| 4681 execve("/bin/sh", (char* const*)argv, environ); | |
| 4682 | |
| 4683 // execve failed | |
| 4684 _exit(-1); | |
| 4685 | |
| 4686 } else { | |
| 4687 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 4688 // care about the actual exit code, for now. | |
| 4689 | |
| 4690 int status; | |
| 4691 | |
| 4692 // Wait for the child process to exit. This returns immediately if | |
| 4693 // the child has already exited. */ | |
| 4694 while (waitpid(pid, &status, 0) < 0) { | |
| 4695 switch (errno) { | |
| 4696 case ECHILD: return 0; | |
| 4697 case EINTR: break; | |
| 4698 default: return -1; | |
| 4699 } | |
| 4700 } | |
| 4701 | |
| 4702 if (WIFEXITED(status)) { | |
| 4703 // The child exited normally; get its exit code. | |
| 4704 return WEXITSTATUS(status); | |
| 4705 } else if (WIFSIGNALED(status)) { | |
| 4706 // The child exited because of a signal | |
| 4707 // The best value to return is 0x80 + signal number, | |
| 4708 // because that is what all Unix shells do, and because | |
| 4709 // it allows callers to distinguish between process exit and | |
| 4710 // process death by signal. | |
| 4711 return 0x80 + WTERMSIG(status); | |
| 4712 } else { | |
| 4713 // Unknown exit code; pass it through | |
| 4714 return status; | |
| 4715 } | |
| 4716 } | |
| 4717 } | |
| 4718 | |
| 4719 // is_headless_jre() | |
| 4720 // | |
|
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4006
diff
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|
4721 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| 3960 | 4722 // in order to report if we are running in a headless jre |
| 4723 // | |
|
4082
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4006
diff
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|
4724 // Since JDK8 xawt/libmawt.so was moved into the same directory |
|
36b057451829
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diff
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|
4725 // as libawt.so, and renamed libawt_xawt.so |
|
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4006
diff
changeset
|
4726 // |
| 3960 | 4727 bool os::is_headless_jre() { |
| 12990 | 4728 #ifdef __APPLE__ |
| 4729 // We no longer build headless-only on Mac OS X | |
| 4730 return false; | |
| 4731 #else | |
| 3960 | 4732 struct stat statbuf; |
| 4733 char buf[MAXPATHLEN]; | |
| 4734 char libmawtpath[MAXPATHLEN]; | |
| 4006 | 4735 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
| 5921 | 4736 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
| 3960 | 4737 char *p; |
| 4738 | |
| 4739 // Get path to libjvm.so | |
| 4740 os::jvm_path(buf, sizeof(buf)); | |
| 4741 | |
| 4742 // Get rid of libjvm.so | |
| 4743 p = strrchr(buf, '/'); | |
| 4744 if (p == NULL) return false; | |
| 4745 else *p = '\0'; | |
| 4746 | |
| 4747 // Get rid of client or server | |
| 4748 p = strrchr(buf, '/'); | |
| 4749 if (p == NULL) return false; | |
| 4750 else *p = '\0'; | |
| 4751 | |
| 4752 // check xawt/libmawt.so | |
| 4753 strcpy(libmawtpath, buf); | |
| 4754 strcat(libmawtpath, xawtstr); | |
| 4755 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
| 4756 | |
|
4082
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4006
diff
changeset
|
4757 // check libawt_xawt.so |
| 3960 | 4758 strcpy(libmawtpath, buf); |
|
4082
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4006
diff
changeset
|
4759 strcat(libmawtpath, new_xawtstr); |
| 3960 | 4760 if (::stat(libmawtpath, &statbuf) == 0) return false; |
| 4761 | |
| 4762 return true; | |
| 12990 | 4763 #endif |
| 3960 | 4764 } |
|
6200
65906dc96aa1
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mikael
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6197
diff
changeset
|
4765 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4766 // Get the default path to the core file |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4767 // Returns the length of the string |
|
65906dc96aa1
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mikael
parents:
6197
diff
changeset
|
4768 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
|
4769 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4770 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4771 // Truncate if theoretical string was longer than bufferSize |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4772 n = MIN2(n, (int)bufferSize); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4773 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4774 return n; |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4775 } |
| 10405 | 4776 |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
12096
diff
changeset
|
4777 #ifndef PRODUCT |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
12096
diff
changeset
|
4778 void TestReserveMemorySpecial_test() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
12096
diff
changeset
|
4779 // No tests available for this platform |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
12096
diff
changeset
|
4780 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
12096
diff
changeset
|
4781 #endif |