Mercurial > hg > graal-jvmci-8
annotate src/os/linux/vm/os_linux.cpp @ 14410:f42f2e2a1518
8020775: PPC64 (part 12): posix signal printing
Summary: Implement methods printing posix signal information and call them in unix os files.
Reviewed-by: kvn, dholmes, twisti
Contributed-by: thomas.stuefe@sap.com
author | goetz |
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date | Fri, 26 Jul 2013 00:59:18 +0200 |
parents | 438e13354adf |
children | e2722a66aba7 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 // no precompiled headers |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "code/vtableStubs.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
1972 | 33 #include "interpreter/interpreter.hpp" |
34 #include "jvm_linux.h" | |
35 #include "memory/allocation.inline.hpp" | |
36 #include "memory/filemap.hpp" | |
37 #include "mutex_linux.inline.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "os_share_linux.hpp" | |
40 #include "prims/jniFastGetField.hpp" | |
41 #include "prims/jvm.h" | |
42 #include "prims/jvm_misc.hpp" | |
43 #include "runtime/arguments.hpp" | |
44 #include "runtime/extendedPC.hpp" | |
45 #include "runtime/globals.hpp" | |
46 #include "runtime/interfaceSupport.hpp" | |
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47 #include "runtime/init.hpp" |
1972 | 48 #include "runtime/java.hpp" |
49 #include "runtime/javaCalls.hpp" | |
50 #include "runtime/mutexLocker.hpp" | |
51 #include "runtime/objectMonitor.hpp" | |
52 #include "runtime/osThread.hpp" | |
53 #include "runtime/perfMemory.hpp" | |
54 #include "runtime/sharedRuntime.hpp" | |
55 #include "runtime/statSampler.hpp" | |
56 #include "runtime/stubRoutines.hpp" | |
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57 #include "runtime/thread.inline.hpp" |
1972 | 58 #include "runtime/threadCritical.hpp" |
59 #include "runtime/timer.hpp" | |
60 #include "services/attachListener.hpp" | |
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61 #include "services/memTracker.hpp" |
1972 | 62 #include "services/runtimeService.hpp" |
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63 #include "utilities/decoder.hpp" |
1972 | 64 #include "utilities/defaultStream.hpp" |
65 #include "utilities/events.hpp" | |
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66 #include "utilities/elfFile.hpp" |
1972 | 67 #include "utilities/growableArray.hpp" |
68 #include "utilities/vmError.hpp" | |
0 | 69 |
70 // put OS-includes here | |
71 # include <sys/types.h> | |
72 # include <sys/mman.h> | |
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73 # include <sys/stat.h> |
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74 # include <sys/select.h> |
0 | 75 # include <pthread.h> |
76 # include <signal.h> | |
77 # include <errno.h> | |
78 # include <dlfcn.h> | |
79 # include <stdio.h> | |
80 # include <unistd.h> | |
81 # include <sys/resource.h> | |
82 # include <pthread.h> | |
83 # include <sys/stat.h> | |
84 # include <sys/time.h> | |
85 # include <sys/times.h> | |
86 # include <sys/utsname.h> | |
87 # include <sys/socket.h> | |
88 # include <sys/wait.h> | |
89 # include <pwd.h> | |
90 # include <poll.h> | |
91 # include <semaphore.h> | |
92 # include <fcntl.h> | |
93 # include <string.h> | |
94 # include <syscall.h> | |
95 # include <sys/sysinfo.h> | |
96 # include <gnu/libc-version.h> | |
97 # include <sys/ipc.h> | |
98 # include <sys/shm.h> | |
99 # include <link.h> | |
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100 # include <stdint.h> |
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101 # include <inttypes.h> |
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102 # include <sys/ioctl.h> |
0 | 103 |
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104 // if RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling |
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105 // getrusage() is prepared to handle the associated failure. |
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106 #ifndef RUSAGE_THREAD |
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107 #define RUSAGE_THREAD (1) /* only the calling thread */ |
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108 #endif |
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109 |
0 | 110 #define MAX_PATH (2 * K) |
111 | |
112 // for timer info max values which include all bits | |
113 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
114 | |
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115 #define LARGEPAGES_BIT (1 << 6) |
0 | 116 //////////////////////////////////////////////////////////////////////////////// |
117 // global variables | |
118 julong os::Linux::_physical_memory = 0; | |
119 | |
120 address os::Linux::_initial_thread_stack_bottom = NULL; | |
121 uintptr_t os::Linux::_initial_thread_stack_size = 0; | |
122 | |
123 int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
124 int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
125 Mutex* os::Linux::_createThread_lock = NULL; | |
126 pthread_t os::Linux::_main_thread; | |
127 int os::Linux::_page_size = -1; | |
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128 const int os::Linux::_vm_default_page_size = (8 * K); |
0 | 129 bool os::Linux::_is_floating_stack = false; |
130 bool os::Linux::_is_NPTL = false; | |
131 bool os::Linux::_supports_fast_thread_cpu_time = false; | |
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132 const char * os::Linux::_glibc_version = NULL; |
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133 const char * os::Linux::_libpthread_version = NULL; |
0 | 134 |
135 static jlong initial_time_count=0; | |
136 | |
137 static int clock_tics_per_sec = 100; | |
138 | |
139 // For diagnostics to print a message once. see run_periodic_checks | |
140 static sigset_t check_signal_done; | |
14391 | 141 static bool check_signals = true; |
0 | 142 |
143 static pid_t _initial_pid = 0; | |
144 | |
145 /* Signal number used to suspend/resume a thread */ | |
146 | |
147 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
148 static int SR_signum = SIGUSR2; | |
149 sigset_t SR_sigset; | |
150 | |
242 | 151 /* Used to protect dlsym() calls */ |
152 static pthread_mutex_t dl_mutex; | |
153 | |
10405 | 154 // Declarations |
155 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); | |
156 | |
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157 #ifdef JAVASE_EMBEDDED |
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158 class MemNotifyThread: public Thread { |
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159 friend class VMStructs; |
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160 public: |
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161 virtual void run(); |
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162 |
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163 private: |
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164 static MemNotifyThread* _memnotify_thread; |
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165 int _fd; |
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166 |
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167 public: |
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168 |
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169 // Constructor |
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170 MemNotifyThread(int fd); |
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171 |
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172 // Tester |
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173 bool is_memnotify_thread() const { return true; } |
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174 |
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175 // Printing |
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176 char* name() const { return (char*)"Linux MemNotify Thread"; } |
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177 |
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178 // Returns the single instance of the MemNotifyThread |
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179 static MemNotifyThread* memnotify_thread() { return _memnotify_thread; } |
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180 |
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181 // Create and start the single instance of MemNotifyThread |
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182 static void start(); |
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183 }; |
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184 #endif // JAVASE_EMBEDDED |
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185 |
0 | 186 // utility functions |
187 | |
188 static int SR_initialize(); | |
189 | |
190 julong os::available_memory() { | |
191 return Linux::available_memory(); | |
192 } | |
193 | |
194 julong os::Linux::available_memory() { | |
195 // values in struct sysinfo are "unsigned long" | |
196 struct sysinfo si; | |
197 sysinfo(&si); | |
198 | |
199 return (julong)si.freeram * si.mem_unit; | |
200 } | |
201 | |
202 julong os::physical_memory() { | |
203 return Linux::physical_memory(); | |
204 } | |
205 | |
206 //////////////////////////////////////////////////////////////////////////////// | |
207 // environment support | |
208 | |
209 bool os::getenv(const char* name, char* buf, int len) { | |
210 const char* val = ::getenv(name); | |
211 if (val != NULL && strlen(val) < (size_t)len) { | |
212 strcpy(buf, val); | |
213 return true; | |
214 } | |
215 if (len > 0) buf[0] = 0; // return a null string | |
216 return false; | |
217 } | |
218 | |
219 | |
220 // Return true if user is running as root. | |
221 | |
222 bool os::have_special_privileges() { | |
223 static bool init = false; | |
224 static bool privileges = false; | |
225 if (!init) { | |
226 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
227 init = true; | |
228 } | |
229 return privileges; | |
230 } | |
231 | |
232 | |
233 #ifndef SYS_gettid | |
234 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
235 #ifdef __ia64__ | |
236 #define SYS_gettid 1105 | |
237 #elif __i386__ | |
238 #define SYS_gettid 224 | |
239 #elif __amd64__ | |
240 #define SYS_gettid 186 | |
241 #elif __sparc__ | |
242 #define SYS_gettid 143 | |
243 #else | |
244 #error define gettid for the arch | |
245 #endif | |
246 #endif | |
247 | |
248 // Cpu architecture string | |
1010 | 249 #if defined(ZERO) |
250 static char cpu_arch[] = ZERO_LIBARCH; | |
251 #elif defined(IA64) | |
0 | 252 static char cpu_arch[] = "ia64"; |
253 #elif defined(IA32) | |
254 static char cpu_arch[] = "i386"; | |
255 #elif defined(AMD64) | |
256 static char cpu_arch[] = "amd64"; | |
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257 #elif defined(ARM) |
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258 static char cpu_arch[] = "arm"; |
14390 | 259 #elif defined(PPC32) |
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260 static char cpu_arch[] = "ppc"; |
14391 | 261 #elif defined(PPC64) |
262 static char cpu_arch[] = "ppc64"; | |
0 | 263 #elif defined(SPARC) |
264 # ifdef _LP64 | |
265 static char cpu_arch[] = "sparcv9"; | |
266 # else | |
267 static char cpu_arch[] = "sparc"; | |
268 # endif | |
269 #else | |
270 #error Add appropriate cpu_arch setting | |
271 #endif | |
272 | |
273 | |
274 // pid_t gettid() | |
275 // | |
276 // Returns the kernel thread id of the currently running thread. Kernel | |
277 // thread id is used to access /proc. | |
278 // | |
279 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
280 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
281 // | |
282 pid_t os::Linux::gettid() { | |
283 int rslt = syscall(SYS_gettid); | |
284 if (rslt == -1) { | |
285 // old kernel, no NPTL support | |
286 return getpid(); | |
287 } else { | |
288 return (pid_t)rslt; | |
289 } | |
290 } | |
291 | |
292 // Most versions of linux have a bug where the number of processors are | |
293 // determined by looking at the /proc file system. In a chroot environment, | |
294 // the system call returns 1. This causes the VM to act as if it is | |
295 // a single processor and elide locking (see is_MP() call). | |
296 static bool unsafe_chroot_detected = false; | |
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297 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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298 "Java may be unstable running multithreaded in a chroot " |
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299 "environment on Linux when /proc filesystem is not mounted."; |
0 | 300 |
301 void os::Linux::initialize_system_info() { | |
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302 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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303 if (processor_count() == 1) { |
0 | 304 pid_t pid = os::Linux::gettid(); |
305 char fname[32]; | |
306 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
307 FILE *fp = fopen(fname, "r"); | |
308 if (fp == NULL) { | |
309 unsafe_chroot_detected = true; | |
310 } else { | |
311 fclose(fp); | |
312 } | |
313 } | |
314 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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315 assert(processor_count() > 0, "linux error"); |
0 | 316 } |
317 | |
318 void os::init_system_properties_values() { | |
319 // char arch[12]; | |
320 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
321 | |
322 // The next steps are taken in the product version: | |
323 // | |
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324 // Obtain the JAVA_HOME value from the location of libjvm.so. |
0 | 325 // This library should be located at: |
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326 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
0 | 327 // |
328 // If "/jre/lib/" appears at the right place in the path, then we | |
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329 // assume libjvm.so is installed in a JDK and we use this path. |
0 | 330 // |
331 // Otherwise exit with message: "Could not create the Java virtual machine." | |
332 // | |
333 // The following extra steps are taken in the debugging version: | |
334 // | |
335 // If "/jre/lib/" does NOT appear at the right place in the path | |
336 // instead of exit check for $JAVA_HOME environment variable. | |
337 // | |
338 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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339 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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340 // it looks like libjvm.so is installed there |
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341 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
0 | 342 // |
343 // Otherwise exit. | |
344 // | |
345 // Important note: if the location of libjvm.so changes this | |
346 // code needs to be changed accordingly. | |
347 | |
348 // The next few definitions allow the code to be verbatim: | |
6197 | 349 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
0 | 350 #define getenv(n) ::getenv(n) |
351 | |
352 /* | |
353 * See ld(1): | |
354 * The linker uses the following search paths to locate required | |
355 * shared libraries: | |
356 * 1: ... | |
357 * ... | |
358 * 7: The default directories, normally /lib and /usr/lib. | |
359 */ | |
509
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360 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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361 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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362 #else |
0 | 363 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
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364 #endif |
0 | 365 |
366 #define EXTENSIONS_DIR "/lib/ext" | |
367 #define ENDORSED_DIR "/lib/endorsed" | |
368 #define REG_DIR "/usr/java/packages" | |
369 | |
370 { | |
371 /* sysclasspath, java_home, dll_dir */ | |
372 { | |
373 char *home_path; | |
374 char *dll_path; | |
375 char *pslash; | |
376 char buf[MAXPATHLEN]; | |
377 os::jvm_path(buf, sizeof(buf)); | |
378 | |
379 // Found the full path to libjvm.so. | |
380 // Now cut the path to <java_home>/jre if we can. | |
381 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
382 pslash = strrchr(buf, '/'); | |
383 if (pslash != NULL) | |
384 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
385 dll_path = malloc(strlen(buf) + 1); | |
386 if (dll_path == NULL) | |
387 return; | |
388 strcpy(dll_path, buf); | |
389 Arguments::set_dll_dir(dll_path); | |
390 | |
391 if (pslash != NULL) { | |
392 pslash = strrchr(buf, '/'); | |
393 if (pslash != NULL) { | |
394 *pslash = '\0'; /* get rid of /<arch> */ | |
395 pslash = strrchr(buf, '/'); | |
396 if (pslash != NULL) | |
397 *pslash = '\0'; /* get rid of /lib */ | |
398 } | |
399 } | |
400 | |
401 home_path = malloc(strlen(buf) + 1); | |
402 if (home_path == NULL) | |
403 return; | |
404 strcpy(home_path, buf); | |
405 Arguments::set_java_home(home_path); | |
406 | |
407 if (!set_boot_path('/', ':')) | |
408 return; | |
409 } | |
410 | |
411 /* | |
412 * Where to look for native libraries | |
413 * | |
414 * Note: Due to a legacy implementation, most of the library path | |
415 * is set in the launcher. This was to accomodate linking restrictions | |
416 * on legacy Linux implementations (which are no longer supported). | |
417 * Eventually, all the library path setting will be done here. | |
418 * | |
419 * However, to prevent the proliferation of improperly built native | |
420 * libraries, the new path component /usr/java/packages is added here. | |
421 * Eventually, all the library path setting will be done here. | |
422 */ | |
423 { | |
424 char *ld_library_path; | |
425 | |
426 /* | |
427 * Construct the invariant part of ld_library_path. Note that the | |
428 * space for the colon and the trailing null are provided by the | |
429 * nulls included by the sizeof operator (so actually we allocate | |
430 * a byte more than necessary). | |
431 */ | |
432 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + | |
433 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
434 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
435 | |
436 /* | |
437 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
438 * should always exist (until the legacy problem cited above is | |
439 * addressed). | |
440 */ | |
441 char *v = getenv("LD_LIBRARY_PATH"); | |
442 if (v != NULL) { | |
443 char *t = ld_library_path; | |
444 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
445 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
446 sprintf(ld_library_path, "%s:%s", v, t); | |
447 } | |
448 Arguments::set_library_path(ld_library_path); | |
449 } | |
450 | |
451 /* | |
452 * Extensions directories. | |
453 * | |
454 * Note that the space for the colon and the trailing null are provided | |
455 * by the nulls included by the sizeof operator (so actually one byte more | |
456 * than necessary is allocated). | |
457 */ | |
458 { | |
459 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
460 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
461 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
462 Arguments::get_java_home()); | |
463 Arguments::set_ext_dirs(buf); | |
464 } | |
465 | |
466 /* Endorsed standards default directory. */ | |
467 { | |
468 char * buf; | |
469 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
470 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
471 Arguments::set_endorsed_dirs(buf); | |
472 } | |
473 } | |
474 | |
475 #undef malloc | |
476 #undef getenv | |
477 #undef EXTENSIONS_DIR | |
478 #undef ENDORSED_DIR | |
479 | |
480 // Done | |
481 return; | |
482 } | |
483 | |
484 //////////////////////////////////////////////////////////////////////////////// | |
485 // breakpoint support | |
486 | |
487 void os::breakpoint() { | |
488 BREAKPOINT; | |
489 } | |
490 | |
491 extern "C" void breakpoint() { | |
492 // use debugger to set breakpoint here | |
493 } | |
494 | |
495 //////////////////////////////////////////////////////////////////////////////// | |
496 // signal support | |
497 | |
498 debug_only(static bool signal_sets_initialized = false); | |
499 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
500 | |
501 bool os::Linux::is_sig_ignored(int sig) { | |
502 struct sigaction oact; | |
503 sigaction(sig, (struct sigaction*)NULL, &oact); | |
504 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
505 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
506 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
507 return true; | |
508 else | |
509 return false; | |
510 } | |
511 | |
512 void os::Linux::signal_sets_init() { | |
513 // Should also have an assertion stating we are still single-threaded. | |
514 assert(!signal_sets_initialized, "Already initialized"); | |
515 // Fill in signals that are necessarily unblocked for all threads in | |
516 // the VM. Currently, we unblock the following signals: | |
517 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
518 // by -Xrs (=ReduceSignalUsage)); | |
519 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
520 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
521 // the dispositions or masks wrt these signals. | |
522 // Programs embedding the VM that want to use the above signals for their | |
523 // own purposes must, at this time, use the "-Xrs" option to prevent | |
524 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
525 // (See bug 4345157, and other related bugs). | |
526 // In reality, though, unblocking these signals is really a nop, since | |
527 // these signals are not blocked by default. | |
528 sigemptyset(&unblocked_sigs); | |
529 sigemptyset(&allowdebug_blocked_sigs); | |
530 sigaddset(&unblocked_sigs, SIGILL); | |
531 sigaddset(&unblocked_sigs, SIGSEGV); | |
532 sigaddset(&unblocked_sigs, SIGBUS); | |
533 sigaddset(&unblocked_sigs, SIGFPE); | |
534 sigaddset(&unblocked_sigs, SR_signum); | |
535 | |
536 if (!ReduceSignalUsage) { | |
537 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
538 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
539 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
540 } | |
541 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
542 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
543 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
544 } | |
545 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
546 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
547 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
548 } | |
549 } | |
550 // Fill in signals that are blocked by all but the VM thread. | |
551 sigemptyset(&vm_sigs); | |
552 if (!ReduceSignalUsage) | |
553 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
554 debug_only(signal_sets_initialized = true); | |
555 | |
556 } | |
557 | |
558 // These are signals that are unblocked while a thread is running Java. | |
559 // (For some reason, they get blocked by default.) | |
560 sigset_t* os::Linux::unblocked_signals() { | |
561 assert(signal_sets_initialized, "Not initialized"); | |
562 return &unblocked_sigs; | |
563 } | |
564 | |
565 // These are the signals that are blocked while a (non-VM) thread is | |
566 // running Java. Only the VM thread handles these signals. | |
567 sigset_t* os::Linux::vm_signals() { | |
568 assert(signal_sets_initialized, "Not initialized"); | |
569 return &vm_sigs; | |
570 } | |
571 | |
572 // These are signals that are blocked during cond_wait to allow debugger in | |
573 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
574 assert(signal_sets_initialized, "Not initialized"); | |
575 return &allowdebug_blocked_sigs; | |
576 } | |
577 | |
578 void os::Linux::hotspot_sigmask(Thread* thread) { | |
579 | |
580 //Save caller's signal mask before setting VM signal mask | |
581 sigset_t caller_sigmask; | |
582 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
583 | |
584 OSThread* osthread = thread->osthread(); | |
585 osthread->set_caller_sigmask(caller_sigmask); | |
586 | |
587 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
588 | |
589 if (!ReduceSignalUsage) { | |
590 if (thread->is_VM_thread()) { | |
591 // Only the VM thread handles BREAK_SIGNAL ... | |
592 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
593 } else { | |
594 // ... all other threads block BREAK_SIGNAL | |
595 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
596 } | |
597 } | |
598 } | |
599 | |
600 ////////////////////////////////////////////////////////////////////////////// | |
601 // detecting pthread library | |
602 | |
603 void os::Linux::libpthread_init() { | |
604 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
605 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
606 // generic name for earlier versions. | |
607 // Define macros here so we can build HotSpot on old systems. | |
608 # ifndef _CS_GNU_LIBC_VERSION | |
609 # define _CS_GNU_LIBC_VERSION 2 | |
610 # endif | |
611 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
612 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
613 # endif | |
614 | |
615 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
616 if (n > 0) { | |
6197 | 617 char *str = (char *)malloc(n, mtInternal); |
0 | 618 confstr(_CS_GNU_LIBC_VERSION, str, n); |
619 os::Linux::set_glibc_version(str); | |
620 } else { | |
621 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
622 static char _gnu_libc_version[32]; | |
623 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
624 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
625 os::Linux::set_glibc_version(_gnu_libc_version); | |
626 } | |
627 | |
628 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
629 if (n > 0) { | |
6197 | 630 char *str = (char *)malloc(n, mtInternal); |
0 | 631 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
632 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
633 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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634 // is the case. LinuxThreads has a hard limit on max number of threads. |
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635 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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636 // On the other hand, NPTL does not have such a limit, sysconf() |
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637 // will return -1 and errno is not changed. Check if it is really NPTL. |
0 | 638 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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639 strstr(str, "NPTL") && |
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640 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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641 free(str); |
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642 os::Linux::set_libpthread_version("linuxthreads"); |
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643 } else { |
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644 os::Linux::set_libpthread_version(str); |
0 | 645 } |
646 } else { | |
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647 // glibc before 2.3.2 only has LinuxThreads. |
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648 os::Linux::set_libpthread_version("linuxthreads"); |
0 | 649 } |
650 | |
651 if (strstr(libpthread_version(), "NPTL")) { | |
652 os::Linux::set_is_NPTL(); | |
653 } else { | |
654 os::Linux::set_is_LinuxThreads(); | |
655 } | |
656 | |
657 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
658 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
659 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
660 os::Linux::set_is_floating_stack(); | |
661 } | |
662 } | |
663 | |
664 ///////////////////////////////////////////////////////////////////////////// | |
665 // thread stack | |
666 | |
667 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
668 // to the stack guard, caller should block all signals. | |
669 // | |
670 // MAP_GROWSDOWN: | |
671 // A special mmap() flag that is used to implement thread stacks. It tells | |
672 // kernel that the memory region should extend downwards when needed. This | |
673 // allows early versions of LinuxThreads to only mmap the first few pages | |
674 // when creating a new thread. Linux kernel will automatically expand thread | |
675 // stack as needed (on page faults). | |
676 // | |
677 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
678 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
679 // region, it's hard to tell if the fault is due to a legitimate stack | |
680 // access or because of reading/writing non-exist memory (e.g. buffer | |
681 // overrun). As a rule, if the fault happens below current stack pointer, | |
682 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
683 // application (see Linux kernel fault.c). | |
684 // | |
685 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
686 // stack overflow detection. | |
687 // | |
688 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
689 // not use this flag. However, the stack of initial thread is not created | |
690 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
691 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
692 // and then attach the thread to JVM. | |
693 // | |
694 // To get around the problem and allow stack banging on Linux, we need to | |
695 // manually expand thread stack after receiving the SIGSEGV. | |
696 // | |
697 // There are two ways to expand thread stack to address "bottom", we used | |
698 // both of them in JVM before 1.5: | |
699 // 1. adjust stack pointer first so that it is below "bottom", and then | |
700 // touch "bottom" | |
701 // 2. mmap() the page in question | |
702 // | |
703 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
704 // if current sp is already near the lower end of page 101, and we need to | |
705 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
706 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
707 // That will destroy the mmap() frame and cause VM to crash. | |
708 // | |
709 // The following code works by adjusting sp first, then accessing the "bottom" | |
710 // page to force a page fault. Linux kernel will then automatically expand the | |
711 // stack mapping. | |
712 // | |
713 // _expand_stack_to() assumes its frame size is less than page size, which | |
714 // should always be true if the function is not inlined. | |
715 | |
716 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
717 #define NOINLINE | |
718 #else | |
719 #define NOINLINE __attribute__ ((noinline)) | |
720 #endif | |
721 | |
722 static void _expand_stack_to(address bottom) NOINLINE; | |
723 | |
724 static void _expand_stack_to(address bottom) { | |
725 address sp; | |
726 size_t size; | |
727 volatile char *p; | |
728 | |
729 // Adjust bottom to point to the largest address within the same page, it | |
730 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
731 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
732 bottom += os::Linux::page_size() - 1; | |
733 | |
734 // sp might be slightly above current stack pointer; if that's the case, we | |
735 // will alloca() a little more space than necessary, which is OK. Don't use | |
736 // os::current_stack_pointer(), as its result can be slightly below current | |
737 // stack pointer, causing us to not alloca enough to reach "bottom". | |
738 sp = (address)&sp; | |
739 | |
740 if (sp > bottom) { | |
741 size = sp - bottom; | |
742 p = (volatile char *)alloca(size); | |
743 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
744 p[0] = '\0'; | |
745 } | |
746 } | |
747 | |
748 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
749 assert(t!=NULL, "just checking"); | |
750 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
751 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
752 | |
753 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
754 sigset_t mask_all, old_sigset; | |
755 sigfillset(&mask_all); | |
756 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
757 _expand_stack_to(addr); | |
758 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
759 return true; | |
760 } | |
761 return false; | |
762 } | |
763 | |
764 ////////////////////////////////////////////////////////////////////////////// | |
765 // create new thread | |
766 | |
767 static address highest_vm_reserved_address(); | |
768 | |
769 // check if it's safe to start a new thread | |
770 static bool _thread_safety_check(Thread* thread) { | |
771 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
772 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
773 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
774 // allocated (MAP_FIXED) from high address space. Every thread stack | |
775 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
776 // it to other values if they rebuild LinuxThreads). | |
777 // | |
778 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
779 // the memory region has already been mmap'ed. That means if we have too | |
780 // many threads and/or very large heap, eventually thread stack will | |
781 // collide with heap. | |
782 // | |
783 // Here we try to prevent heap/stack collision by comparing current | |
784 // stack bottom with the highest address that has been mmap'ed by JVM | |
785 // plus a safety margin for memory maps created by native code. | |
786 // | |
787 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
788 // | |
789 if (ThreadSafetyMargin > 0) { | |
790 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
791 | |
792 // not safe if our stack extends below the safety margin | |
793 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
794 } else { | |
795 return true; | |
796 } | |
797 } else { | |
798 // Floating stack LinuxThreads or NPTL: | |
799 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
800 // there's not enough space left, pthread_create() will fail. If we come | |
801 // here, that means enough space has been reserved for stack. | |
802 return true; | |
803 } | |
804 } | |
805 | |
806 // Thread start routine for all newly created threads | |
807 static void *java_start(Thread *thread) { | |
808 // Try to randomize the cache line index of hot stack frames. | |
809 // This helps when threads of the same stack traces evict each other's | |
810 // cache lines. The threads can be either from the same JVM instance, or | |
811 // from different JVM instances. The benefit is especially true for | |
812 // processors with hyperthreading technology. | |
813 static int counter = 0; | |
814 int pid = os::current_process_id(); | |
815 alloca(((pid ^ counter++) & 7) * 128); | |
816 | |
817 ThreadLocalStorage::set_thread(thread); | |
818 | |
819 OSThread* osthread = thread->osthread(); | |
820 Monitor* sync = osthread->startThread_lock(); | |
821 | |
822 // non floating stack LinuxThreads needs extra check, see above | |
823 if (!_thread_safety_check(thread)) { | |
824 // notify parent thread | |
825 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
826 osthread->set_state(ZOMBIE); | |
827 sync->notify_all(); | |
828 return NULL; | |
829 } | |
830 | |
831 // thread_id is kernel thread id (similar to Solaris LWP id) | |
832 osthread->set_thread_id(os::Linux::gettid()); | |
833 | |
834 if (UseNUMA) { | |
835 int lgrp_id = os::numa_get_group_id(); | |
836 if (lgrp_id != -1) { | |
837 thread->set_lgrp_id(lgrp_id); | |
838 } | |
839 } | |
840 // initialize signal mask for this thread | |
841 os::Linux::hotspot_sigmask(thread); | |
842 | |
843 // initialize floating point control register | |
844 os::Linux::init_thread_fpu_state(); | |
845 | |
846 // handshaking with parent thread | |
847 { | |
848 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
849 | |
850 // notify parent thread | |
851 osthread->set_state(INITIALIZED); | |
852 sync->notify_all(); | |
853 | |
854 // wait until os::start_thread() | |
855 while (osthread->get_state() == INITIALIZED) { | |
856 sync->wait(Mutex::_no_safepoint_check_flag); | |
857 } | |
858 } | |
859 | |
860 // call one more level start routine | |
861 thread->run(); | |
862 | |
863 return 0; | |
864 } | |
865 | |
866 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
867 assert(thread->osthread() == NULL, "caller responsible"); | |
868 | |
869 // Allocate the OSThread object | |
870 OSThread* osthread = new OSThread(NULL, NULL); | |
871 if (osthread == NULL) { | |
872 return false; | |
873 } | |
874 | |
875 // set the correct thread state | |
876 osthread->set_thread_type(thr_type); | |
877 | |
878 // Initial state is ALLOCATED but not INITIALIZED | |
879 osthread->set_state(ALLOCATED); | |
880 | |
881 thread->set_osthread(osthread); | |
882 | |
883 // init thread attributes | |
884 pthread_attr_t attr; | |
885 pthread_attr_init(&attr); | |
886 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
887 | |
888 // stack size | |
889 if (os::Linux::supports_variable_stack_size()) { | |
890 // calculate stack size if it's not specified by caller | |
891 if (stack_size == 0) { | |
892 stack_size = os::Linux::default_stack_size(thr_type); | |
893 | |
894 switch (thr_type) { | |
895 case os::java_thread: | |
1867
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896 // Java threads use ThreadStackSize which default value can be |
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897 // changed with the flag -Xss |
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898 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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899 stack_size = JavaThread::stack_size_at_create(); |
0 | 900 break; |
901 case os::compiler_thread: | |
902 if (CompilerThreadStackSize > 0) { | |
903 stack_size = (size_t)(CompilerThreadStackSize * K); | |
904 break; | |
905 } // else fall through: | |
906 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
907 case os::vm_thread: | |
908 case os::pgc_thread: | |
909 case os::cgc_thread: | |
910 case os::watcher_thread: | |
911 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
912 break; | |
913 } | |
914 } | |
915 | |
916 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
917 pthread_attr_setstacksize(&attr, stack_size); | |
918 } else { | |
919 // let pthread_create() pick the default value. | |
920 } | |
921 | |
922 // glibc guard page | |
923 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
924 | |
925 ThreadState state; | |
926 | |
927 { | |
928 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
929 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
930 if (lock) { | |
931 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
932 } | |
933 | |
934 pthread_t tid; | |
935 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
936 | |
937 pthread_attr_destroy(&attr); | |
938 | |
939 if (ret != 0) { | |
940 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
941 perror("pthread_create()"); | |
942 } | |
943 // Need to clean up stuff we've allocated so far | |
944 thread->set_osthread(NULL); | |
945 delete osthread; | |
946 if (lock) os::Linux::createThread_lock()->unlock(); | |
947 return false; | |
948 } | |
949 | |
950 // Store pthread info into the OSThread | |
951 osthread->set_pthread_id(tid); | |
952 | |
953 // Wait until child thread is either initialized or aborted | |
954 { | |
955 Monitor* sync_with_child = osthread->startThread_lock(); | |
956 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
957 while ((state = osthread->get_state()) == ALLOCATED) { | |
958 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
959 } | |
960 } | |
961 | |
962 if (lock) { | |
963 os::Linux::createThread_lock()->unlock(); | |
964 } | |
965 } | |
966 | |
967 // Aborted due to thread limit being reached | |
968 if (state == ZOMBIE) { | |
969 thread->set_osthread(NULL); | |
970 delete osthread; | |
971 return false; | |
972 } | |
973 | |
974 // The thread is returned suspended (in state INITIALIZED), | |
975 // and is started higher up in the call chain | |
976 assert(state == INITIALIZED, "race condition"); | |
977 return true; | |
978 } | |
979 | |
980 ///////////////////////////////////////////////////////////////////////////// | |
981 // attach existing thread | |
982 | |
983 // bootstrap the main thread | |
984 bool os::create_main_thread(JavaThread* thread) { | |
985 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
986 return create_attached_thread(thread); | |
987 } | |
988 | |
989 bool os::create_attached_thread(JavaThread* thread) { | |
990 #ifdef ASSERT | |
991 thread->verify_not_published(); | |
992 #endif | |
993 | |
994 // Allocate the OSThread object | |
995 OSThread* osthread = new OSThread(NULL, NULL); | |
996 | |
997 if (osthread == NULL) { | |
998 return false; | |
999 } | |
1000 | |
1001 // Store pthread info into the OSThread | |
1002 osthread->set_thread_id(os::Linux::gettid()); | |
1003 osthread->set_pthread_id(::pthread_self()); | |
1004 | |
1005 // initialize floating point control register | |
1006 os::Linux::init_thread_fpu_state(); | |
1007 | |
1008 // Initial thread state is RUNNABLE | |
1009 osthread->set_state(RUNNABLE); | |
1010 | |
1011 thread->set_osthread(osthread); | |
1012 | |
1013 if (UseNUMA) { | |
1014 int lgrp_id = os::numa_get_group_id(); | |
1015 if (lgrp_id != -1) { | |
1016 thread->set_lgrp_id(lgrp_id); | |
1017 } | |
1018 } | |
1019 | |
1020 if (os::Linux::is_initial_thread()) { | |
1021 // If current thread is initial thread, its stack is mapped on demand, | |
1022 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
1023 // the entire stack region to avoid SEGV in stack banging. | |
1024 // It is also useful to get around the heap-stack-gap problem on SuSE | |
1025 // kernel (see 4821821 for details). We first expand stack to the top | |
1026 // of yellow zone, then enable stack yellow zone (order is significant, | |
1027 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
1028 // is no gap between the last two virtual memory regions. | |
1029 | |
1030 JavaThread *jt = (JavaThread *)thread; | |
1031 address addr = jt->stack_yellow_zone_base(); | |
1032 assert(addr != NULL, "initialization problem?"); | |
1033 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
1034 | |
1035 osthread->set_expanding_stack(); | |
1036 os::Linux::manually_expand_stack(jt, addr); | |
1037 osthread->clear_expanding_stack(); | |
1038 } | |
1039 | |
1040 // initialize signal mask for this thread | |
1041 // and save the caller's signal mask | |
1042 os::Linux::hotspot_sigmask(thread); | |
1043 | |
1044 return true; | |
1045 } | |
1046 | |
1047 void os::pd_start_thread(Thread* thread) { | |
1048 OSThread * osthread = thread->osthread(); | |
1049 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
1050 Monitor* sync_with_child = osthread->startThread_lock(); | |
1051 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
1052 sync_with_child->notify(); | |
1053 } | |
1054 | |
1055 // Free Linux resources related to the OSThread | |
1056 void os::free_thread(OSThread* osthread) { | |
1057 assert(osthread != NULL, "osthread not set"); | |
1058 | |
1059 if (Thread::current()->osthread() == osthread) { | |
1060 // Restore caller's signal mask | |
1061 sigset_t sigmask = osthread->caller_sigmask(); | |
1062 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
1063 } | |
1064 | |
1065 delete osthread; | |
1066 } | |
1067 | |
1068 ////////////////////////////////////////////////////////////////////////////// | |
1069 // thread local storage | |
1070 | |
1071 int os::allocate_thread_local_storage() { | |
1072 pthread_key_t key; | |
1073 int rslt = pthread_key_create(&key, NULL); | |
1074 assert(rslt == 0, "cannot allocate thread local storage"); | |
1075 return (int)key; | |
1076 } | |
1077 | |
1078 // Note: This is currently not used by VM, as we don't destroy TLS key | |
1079 // on VM exit. | |
1080 void os::free_thread_local_storage(int index) { | |
1081 int rslt = pthread_key_delete((pthread_key_t)index); | |
1082 assert(rslt == 0, "invalid index"); | |
1083 } | |
1084 | |
1085 void os::thread_local_storage_at_put(int index, void* value) { | |
1086 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
1087 assert(rslt == 0, "pthread_setspecific failed"); | |
1088 } | |
1089 | |
1090 extern "C" Thread* get_thread() { | |
1091 return ThreadLocalStorage::thread(); | |
1092 } | |
1093 | |
1094 ////////////////////////////////////////////////////////////////////////////// | |
1095 // initial thread | |
1096 | |
1097 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
1098 bool os::Linux::is_initial_thread(void) { | |
1099 char dummy; | |
1100 // If called before init complete, thread stack bottom will be null. | |
1101 // Can be called if fatal error occurs before initialization. | |
1102 if (initial_thread_stack_bottom() == NULL) return false; | |
1103 assert(initial_thread_stack_bottom() != NULL && | |
1104 initial_thread_stack_size() != 0, | |
1105 "os::init did not locate initial thread's stack region"); | |
1106 if ((address)&dummy >= initial_thread_stack_bottom() && | |
1107 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
1108 return true; | |
1109 else return false; | |
1110 } | |
1111 | |
1112 // Find the virtual memory area that contains addr | |
1113 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
1114 FILE *fp = fopen("/proc/self/maps", "r"); | |
1115 if (fp) { | |
1116 address low, high; | |
1117 while (!feof(fp)) { | |
1118 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
1119 if (low <= addr && addr < high) { | |
1120 if (vma_low) *vma_low = low; | |
1121 if (vma_high) *vma_high = high; | |
1122 fclose (fp); | |
1123 return true; | |
1124 } | |
1125 } | |
1126 for (;;) { | |
1127 int ch = fgetc(fp); | |
1128 if (ch == EOF || ch == (int)'\n') break; | |
1129 } | |
1130 } | |
1131 fclose(fp); | |
1132 } | |
1133 return false; | |
1134 } | |
1135 | |
1136 // Locate initial thread stack. This special handling of initial thread stack | |
1137 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
1138 // bogus value for initial thread. | |
1139 void os::Linux::capture_initial_stack(size_t max_size) { | |
1140 // stack size is the easy part, get it from RLIMIT_STACK | |
1141 size_t stack_size; | |
1142 struct rlimit rlim; | |
1143 getrlimit(RLIMIT_STACK, &rlim); | |
1144 stack_size = rlim.rlim_cur; | |
1145 | |
1146 // 6308388: a bug in ld.so will relocate its own .data section to the | |
1147 // lower end of primordial stack; reduce ulimit -s value a little bit | |
1148 // so we won't install guard page on ld.so's data section. | |
1149 stack_size -= 2 * page_size(); | |
1150 | |
1151 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
1152 // 7.1, in both cases we will get 2G in return value. | |
1153 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
1154 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
1155 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
1156 // in case other parts in glibc still assumes 2M max stack size. | |
1157 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
1158 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
7994 | 1159 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
1160 stack_size = 2 * K * K IA64_ONLY(*2); | |
0 | 1161 // Try to figure out where the stack base (top) is. This is harder. |
1162 // | |
1163 // When an application is started, glibc saves the initial stack pointer in | |
1164 // a global variable "__libc_stack_end", which is then used by system | |
1165 // libraries. __libc_stack_end should be pretty close to stack top. The | |
1166 // variable is available since the very early days. However, because it is | |
1167 // a private interface, it could disappear in the future. | |
1168 // | |
1169 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
1170 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
1171 // stack top. Note that /proc may not exist if VM is running as a chroot | |
1172 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
1173 // /proc/<pid>/stat could change in the future (though unlikely). | |
1174 // | |
1175 // We try __libc_stack_end first. If that doesn't work, look for | |
1176 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
1177 // as a hint, which should work well in most cases. | |
1178 | |
1179 uintptr_t stack_start; | |
1180 | |
1181 // try __libc_stack_end first | |
1182 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
1183 if (p && *p) { | |
1184 stack_start = *p; | |
1185 } else { | |
1186 // see if we can get the start_stack field from /proc/self/stat | |
1187 FILE *fp; | |
1188 int pid; | |
1189 char state; | |
1190 int ppid; | |
1191 int pgrp; | |
1192 int session; | |
1193 int nr; | |
1194 int tpgrp; | |
1195 unsigned long flags; | |
1196 unsigned long minflt; | |
1197 unsigned long cminflt; | |
1198 unsigned long majflt; | |
1199 unsigned long cmajflt; | |
1200 unsigned long utime; | |
1201 unsigned long stime; | |
1202 long cutime; | |
1203 long cstime; | |
1204 long prio; | |
1205 long nice; | |
1206 long junk; | |
1207 long it_real; | |
1208 uintptr_t start; | |
1209 uintptr_t vsize; | |
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1210 intptr_t rss; |
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1211 uintptr_t rsslim; |
0 | 1212 uintptr_t scodes; |
1213 uintptr_t ecode; | |
1214 int i; | |
1215 | |
1216 // Figure what the primordial thread stack base is. Code is inspired | |
1217 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
1218 // followed by command name surrounded by parentheses, state, etc. | |
1219 char stat[2048]; | |
1220 int statlen; | |
1221 | |
1222 fp = fopen("/proc/self/stat", "r"); | |
1223 if (fp) { | |
1224 statlen = fread(stat, 1, 2047, fp); | |
1225 stat[statlen] = '\0'; | |
1226 fclose(fp); | |
1227 | |
1228 // Skip pid and the command string. Note that we could be dealing with | |
1229 // weird command names, e.g. user could decide to rename java launcher | |
1230 // to "java 1.4.2 :)", then the stat file would look like | |
1231 // 1234 (java 1.4.2 :)) R ... ... | |
1232 // We don't really need to know the command string, just find the last | |
1233 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
1234 char * s = strrchr(stat, ')'); | |
1235 | |
1236 i = 0; | |
1237 if (s) { | |
1238 // Skip blank chars | |
1239 do s++; while (isspace(*s)); | |
1240 | |
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1241 #define _UFM UINTX_FORMAT |
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1242 #define _DFM INTX_FORMAT |
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1243 |
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1244 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1245 /* 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 */ |
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1246 i = sscanf(s, "%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld " _UFM _UFM _DFM _UFM _UFM _UFM _UFM, |
0 | 1247 &state, /* 3 %c */ |
1248 &ppid, /* 4 %d */ | |
1249 &pgrp, /* 5 %d */ | |
1250 &session, /* 6 %d */ | |
1251 &nr, /* 7 %d */ | |
1252 &tpgrp, /* 8 %d */ | |
1253 &flags, /* 9 %lu */ | |
1254 &minflt, /* 10 %lu */ | |
1255 &cminflt, /* 11 %lu */ | |
1256 &majflt, /* 12 %lu */ | |
1257 &cmajflt, /* 13 %lu */ | |
1258 &utime, /* 14 %lu */ | |
1259 &stime, /* 15 %lu */ | |
1260 &cutime, /* 16 %ld */ | |
1261 &cstime, /* 17 %ld */ | |
1262 &prio, /* 18 %ld */ | |
1263 &nice, /* 19 %ld */ | |
1264 &junk, /* 20 %ld */ | |
1265 &it_real, /* 21 %ld */ | |
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1266 &start, /* 22 UINTX_FORMAT */ |
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1267 &vsize, /* 23 UINTX_FORMAT */ |
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1268 &rss, /* 24 INTX_FORMAT */ |
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1269 &rsslim, /* 25 UINTX_FORMAT */ |
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1270 &scodes, /* 26 UINTX_FORMAT */ |
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1271 &ecode, /* 27 UINTX_FORMAT */ |
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1272 &stack_start); /* 28 UINTX_FORMAT */ |
0 | 1273 } |
1274 | |
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1275 #undef _UFM |
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1276 #undef _DFM |
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1277 |
0 | 1278 if (i != 28 - 2) { |
1279 assert(false, "Bad conversion from /proc/self/stat"); | |
1280 // product mode - assume we are the initial thread, good luck in the | |
1281 // embedded case. | |
1282 warning("Can't detect initial thread stack location - bad conversion"); | |
1283 stack_start = (uintptr_t) &rlim; | |
1284 } | |
1285 } else { | |
1286 // For some reason we can't open /proc/self/stat (for example, running on | |
1287 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
1288 // most cases, so don't abort: | |
1289 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
1290 stack_start = (uintptr_t) &rlim; | |
1291 } | |
1292 } | |
1293 | |
1294 // Now we have a pointer (stack_start) very close to the stack top, the | |
1295 // next thing to do is to figure out the exact location of stack top. We | |
1296 // can find out the virtual memory area that contains stack_start by | |
1297 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
1298 // and its upper limit is the real stack top. (again, this would fail if | |
1299 // running inside chroot, because /proc may not exist.) | |
1300 | |
1301 uintptr_t stack_top; | |
1302 address low, high; | |
1303 if (find_vma((address)stack_start, &low, &high)) { | |
1304 // success, "high" is the true stack top. (ignore "low", because initial | |
1305 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
1306 stack_top = (uintptr_t)high; | |
1307 } else { | |
1308 // failed, likely because /proc/self/maps does not exist | |
1309 warning("Can't detect initial thread stack location - find_vma failed"); | |
1310 // best effort: stack_start is normally within a few pages below the real | |
1311 // stack top, use it as stack top, and reduce stack size so we won't put | |
1312 // guard page outside stack. | |
1313 stack_top = stack_start; | |
1314 stack_size -= 16 * page_size(); | |
1315 } | |
1316 | |
1317 // stack_top could be partially down the page so align it | |
1318 stack_top = align_size_up(stack_top, page_size()); | |
1319 | |
1320 if (max_size && stack_size > max_size) { | |
1321 _initial_thread_stack_size = max_size; | |
1322 } else { | |
1323 _initial_thread_stack_size = stack_size; | |
1324 } | |
1325 | |
1326 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
1327 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
1328 } | |
1329 | |
1330 //////////////////////////////////////////////////////////////////////////////// | |
1331 // time support | |
1332 | |
1333 // Time since start-up in seconds to a fine granularity. | |
1334 // Used by VMSelfDestructTimer and the MemProfiler. | |
1335 double os::elapsedTime() { | |
1336 | |
1337 return (double)(os::elapsed_counter()) * 0.000001; | |
1338 } | |
1339 | |
1340 jlong os::elapsed_counter() { | |
1341 timeval time; | |
1342 int status = gettimeofday(&time, NULL); | |
1343 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
1344 } | |
1345 | |
1346 jlong os::elapsed_frequency() { | |
1347 return (1000 * 1000); | |
1348 } | |
1349 | |
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1350 bool os::supports_vtime() { return true; } |
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1351 bool os::enable_vtime() { return false; } |
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1352 bool os::vtime_enabled() { return false; } |
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1353 |
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1354 double os::elapsedVTime() { |
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1355 struct rusage usage; |
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1356 int retval = getrusage(RUSAGE_THREAD, &usage); |
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1357 if (retval == 0) { |
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1358 return (double) (usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) + (double) (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000 * 1000); |
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1359 } else { |
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1360 // better than nothing, but not much |
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1361 return elapsedTime(); |
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1362 } |
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1363 } |
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1364 |
61 | 1365 jlong os::javaTimeMillis() { |
0 | 1366 timeval time; |
1367 int status = gettimeofday(&time, NULL); | |
1368 assert(status != -1, "linux error"); | |
1369 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
1370 } | |
1371 | |
1372 #ifndef CLOCK_MONOTONIC | |
1373 #define CLOCK_MONOTONIC (1) | |
1374 #endif | |
1375 | |
1376 void os::Linux::clock_init() { | |
1377 // we do dlopen's in this particular order due to bug in linux | |
1378 // dynamical loader (see 6348968) leading to crash on exit | |
1379 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
1380 if (handle == NULL) { | |
1381 handle = dlopen("librt.so", RTLD_LAZY); | |
1382 } | |
1383 | |
1384 if (handle) { | |
1385 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
1386 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
1387 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
1388 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
1389 if (clock_getres_func && clock_gettime_func) { | |
1390 // See if monotonic clock is supported by the kernel. Note that some | |
1391 // early implementations simply return kernel jiffies (updated every | |
1392 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
1393 // for nano time (though the monotonic property is still nice to have). | |
1394 // It's fixed in newer kernels, however clock_getres() still returns | |
1395 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
1396 // resolution for now. Hopefully as people move to new kernels, this | |
1397 // won't be a problem. | |
1398 struct timespec res; | |
1399 struct timespec tp; | |
1400 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
1401 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
1402 // yes, monotonic clock is supported | |
1403 _clock_gettime = clock_gettime_func; | |
1404 } else { | |
1405 // close librt if there is no monotonic clock | |
1406 dlclose(handle); | |
1407 } | |
1408 } | |
1409 } | |
1410 } | |
1411 | |
1412 #ifndef SYS_clock_getres | |
1413 | |
1414 #if defined(IA32) || defined(AMD64) | |
1415 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
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1416 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1417 #else |
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1418 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
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1419 #define sys_clock_getres(x,y) -1 |
0 | 1420 #endif |
1421 | |
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1422 #else |
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1423 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1424 #endif |
1425 | |
1426 void os::Linux::fast_thread_clock_init() { | |
1427 if (!UseLinuxPosixThreadCPUClocks) { | |
1428 return; | |
1429 } | |
1430 clockid_t clockid; | |
1431 struct timespec tp; | |
1432 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
1433 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
1434 | |
1435 // Switch to using fast clocks for thread cpu time if | |
1436 // the sys_clock_getres() returns 0 error code. | |
1437 // Note, that some kernels may support the current thread | |
1438 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
1439 // returned by the pthread_getcpuclockid(). | |
1440 // If the fast Posix clocks are supported then the sys_clock_getres() | |
1441 // must return at least tp.tv_sec == 0 which means a resolution | |
1442 // better than 1 sec. This is extra check for reliability. | |
1443 | |
1444 if(pthread_getcpuclockid_func && | |
1445 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
1446 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
1447 | |
1448 _supports_fast_thread_cpu_time = true; | |
1449 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
1450 } | |
1451 } | |
1452 | |
1453 jlong os::javaTimeNanos() { | |
1454 if (Linux::supports_monotonic_clock()) { | |
1455 struct timespec tp; | |
1456 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1457 assert(status == 0, "gettime error"); | |
1458 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1459 return result; | |
1460 } else { | |
1461 timeval time; | |
1462 int status = gettimeofday(&time, NULL); | |
1463 assert(status != -1, "linux error"); | |
1464 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1465 return 1000 * usecs; | |
1466 } | |
1467 } | |
1468 | |
1469 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1470 if (Linux::supports_monotonic_clock()) { | |
1471 info_ptr->max_value = ALL_64_BITS; | |
1472 | |
1473 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1474 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1475 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1476 } else { | |
1477 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1478 info_ptr->max_value = ALL_64_BITS; | |
1479 | |
1480 // gettimeofday is a real time clock so it skips | |
1481 info_ptr->may_skip_backward = true; | |
1482 info_ptr->may_skip_forward = true; | |
1483 } | |
1484 | |
1485 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1486 } | |
1487 | |
1488 // Return the real, user, and system times in seconds from an | |
1489 // arbitrary fixed point in the past. | |
1490 bool os::getTimesSecs(double* process_real_time, | |
1491 double* process_user_time, | |
1492 double* process_system_time) { | |
1493 struct tms ticks; | |
1494 clock_t real_ticks = times(&ticks); | |
1495 | |
1496 if (real_ticks == (clock_t) (-1)) { | |
1497 return false; | |
1498 } else { | |
1499 double ticks_per_second = (double) clock_tics_per_sec; | |
1500 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1501 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1502 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1503 | |
1504 return true; | |
1505 } | |
1506 } | |
1507 | |
1508 | |
1509 char * os::local_time_string(char *buf, size_t buflen) { | |
1510 struct tm t; | |
1511 time_t long_time; | |
1512 time(&long_time); | |
1513 localtime_r(&long_time, &t); | |
1514 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1515 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1516 t.tm_hour, t.tm_min, t.tm_sec); | |
1517 return buf; | |
1518 } | |
1519 | |
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1520 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
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1521 return localtime_r(clock, res); |
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1522 } |
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1523 |
0 | 1524 //////////////////////////////////////////////////////////////////////////////// |
1525 // runtime exit support | |
1526 | |
1527 // Note: os::shutdown() might be called very early during initialization, or | |
1528 // called from signal handler. Before adding something to os::shutdown(), make | |
1529 // sure it is async-safe and can handle partially initialized VM. | |
1530 void os::shutdown() { | |
1531 | |
1532 // allow PerfMemory to attempt cleanup of any persistent resources | |
1533 perfMemory_exit(); | |
1534 | |
1535 // needs to remove object in file system | |
1536 AttachListener::abort(); | |
1537 | |
1538 // flush buffered output, finish log files | |
1539 ostream_abort(); | |
1540 | |
1541 // Check for abort hook | |
1542 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1543 if (abort_hook != NULL) { | |
1544 abort_hook(); | |
1545 } | |
1546 | |
1547 } | |
1548 | |
1549 // Note: os::abort() might be called very early during initialization, or | |
1550 // called from signal handler. Before adding something to os::abort(), make | |
1551 // sure it is async-safe and can handle partially initialized VM. | |
1552 void os::abort(bool dump_core) { | |
1553 os::shutdown(); | |
1554 if (dump_core) { | |
1555 #ifndef PRODUCT | |
1556 fdStream out(defaultStream::output_fd()); | |
1557 out.print_raw("Current thread is "); | |
1558 char buf[16]; | |
1559 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1560 out.print_raw_cr(buf); | |
1561 out.print_raw_cr("Dumping core ..."); | |
1562 #endif | |
1563 ::abort(); // dump core | |
1564 } | |
1565 | |
1566 ::exit(1); | |
1567 } | |
1568 | |
1569 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1570 void os::die() { | |
1571 // _exit() on LinuxThreads only kills current thread | |
1572 ::abort(); | |
1573 } | |
1574 | |
1575 // unused on linux for now. | |
1576 void os::set_error_file(const char *logfile) {} | |
1577 | |
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1578 |
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1579 // This method is a copy of JDK's sysGetLastErrorString |
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1580 // from src/solaris/hpi/src/system_md.c |
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1581 |
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1582 size_t os::lasterror(char *buf, size_t len) { |
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1583 |
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1584 if (errno == 0) return 0; |
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1585 |
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1586 const char *s = ::strerror(errno); |
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1587 size_t n = ::strlen(s); |
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1588 if (n >= len) { |
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1589 n = len - 1; |
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1590 } |
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1591 ::strncpy(buf, s, n); |
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1592 buf[n] = '\0'; |
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1593 return n; |
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1594 } |
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1595 |
0 | 1596 intx os::current_thread_id() { return (intx)pthread_self(); } |
1597 int os::current_process_id() { | |
1598 | |
1599 // Under the old linux thread library, linux gives each thread | |
1600 // its own process id. Because of this each thread will return | |
1601 // a different pid if this method were to return the result | |
1602 // of getpid(2). Linux provides no api that returns the pid | |
1603 // of the launcher thread for the vm. This implementation | |
1604 // returns a unique pid, the pid of the launcher thread | |
1605 // that starts the vm 'process'. | |
1606 | |
1607 // Under the NPTL, getpid() returns the same pid as the | |
1608 // launcher thread rather than a unique pid per thread. | |
1609 // Use gettid() if you want the old pre NPTL behaviour. | |
1610 | |
1611 // if you are looking for the result of a call to getpid() that | |
1612 // returns a unique pid for the calling thread, then look at the | |
1613 // OSThread::thread_id() method in osThread_linux.hpp file | |
1614 | |
1615 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1616 } | |
1617 | |
1618 // DLL functions | |
1619 | |
1620 const char* os::dll_file_extension() { return ".so"; } | |
1621 | |
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1622 // This must be hard coded because it's the system's temporary |
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1623 // directory not the java application's temp directory, ala java.io.tmpdir. |
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1624 const char* os::get_temp_directory() { return "/tmp"; } |
0 | 1625 |
691 | 1626 static bool file_exists(const char* filename) { |
1627 struct stat statbuf; | |
1628 if (filename == NULL || strlen(filename) == 0) { | |
1629 return false; | |
1630 } | |
1631 return os::stat(filename, &statbuf) == 0; | |
1632 } | |
1633 | |
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1634 bool os::dll_build_name(char* buffer, size_t buflen, |
691 | 1635 const char* pname, const char* fname) { |
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1636 bool retval = false; |
691 | 1637 // Copied from libhpi |
242 | 1638 const size_t pnamelen = pname ? strlen(pname) : 0; |
1639 | |
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1640 // Return error on buffer overflow. |
242 | 1641 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
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1642 return retval; |
242 | 1643 } |
1644 | |
1645 if (pnamelen == 0) { | |
691 | 1646 snprintf(buffer, buflen, "lib%s.so", fname); |
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1647 retval = true; |
691 | 1648 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1649 int n; | |
1650 char** pelements = split_path(pname, &n); | |
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1651 if (pelements == NULL) { |
9062 | 1652 return false; |
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8006103: [parfait] Possible null pointer dereference at hotspot/src/os/linux/vm/os_linux.cpp; os_windows.cpp; os_solaris.cpp; os_bsd.cpp
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|
1653 } |
691 | 1654 for (int i = 0 ; i < n ; i++) { |
1655 // Really shouldn't be NULL, but check can't hurt | |
1656 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1657 continue; // skip the empty path values | |
1658 } | |
1659 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1660 if (file_exists(buffer)) { | |
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|
1661 retval = true; |
691 | 1662 break; |
1663 } | |
1664 } | |
1665 // release the storage | |
1666 for (int i = 0 ; i < n ; i++) { | |
1667 if (pelements[i] != NULL) { | |
6197 | 1668 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
691 | 1669 } |
1670 } | |
1671 if (pelements != NULL) { | |
6197 | 1672 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
691 | 1673 } |
242 | 1674 } else { |
691 | 1675 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
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|
1676 retval = true; |
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|
1677 } |
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|
1678 return retval; |
242 | 1679 } |
1680 | |
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
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|
1681 // check if addr is inside libjvm.so |
0 | 1682 bool os::address_is_in_vm(address addr) { |
1683 static address libjvm_base_addr; | |
1684 Dl_info dlinfo; | |
1685 | |
1686 if (libjvm_base_addr == NULL) { | |
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|
1687 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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|
1688 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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|
1689 } |
0 | 1690 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1691 } | |
1692 | |
11092
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|
1693 if (dladdr((void *)addr, &dlinfo) != 0) { |
0 | 1694 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1695 } | |
1696 | |
1697 return false; | |
1698 } | |
1699 | |
1700 bool os::dll_address_to_function_name(address addr, char *buf, | |
1701 int buflen, int *offset) { | |
11092
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|
1702 // buf is not optional, but offset is optional |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1703 assert(buf != NULL, "sanity check"); |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1704 |
0 | 1705 Dl_info dlinfo; |
1706 | |
11092
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|
1707 if (dladdr((void*)addr, &dlinfo) != 0) { |
59b052799158
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|
1708 // see if we have a matching symbol |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1709 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
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|
1710 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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changeset
|
1711 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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|
1712 } |
11092
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|
1713 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
59b052799158
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|
1714 return true; |
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|
1715 } |
59b052799158
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|
1716 // no matching symbol so try for just file info |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1717 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
59b052799158
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|
1718 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1719 buf, buflen, offset, dlinfo.dli_fname)) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1720 return true; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1721 } |
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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diff
changeset
|
1722 } |
11092
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|
1723 } |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1724 |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1725 buf[0] = '\0'; |
2022
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diff
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|
1726 if (offset != NULL) *offset = -1; |
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|
1727 return false; |
0 | 1728 } |
1729 | |
1730 struct _address_to_library_name { | |
1731 address addr; // input : memory address | |
1732 size_t buflen; // size of fname | |
1733 char* fname; // output: library name | |
1734 address base; // library base addr | |
1735 }; | |
1736 | |
1737 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
1738 size_t size, void *data) { | |
1739 int i; | |
1740 bool found = false; | |
1741 address libbase = NULL; | |
1742 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
1743 | |
1744 // iterate through all loadable segments | |
1745 for (i = 0; i < info->dlpi_phnum; i++) { | |
1746 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
1747 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
1748 // base address of a library is the lowest address of its loaded | |
1749 // segments. | |
1750 if (libbase == NULL || libbase > segbase) { | |
1751 libbase = segbase; | |
1752 } | |
1753 // see if 'addr' is within current segment | |
1754 if (segbase <= d->addr && | |
1755 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
1756 found = true; | |
1757 } | |
1758 } | |
1759 } | |
1760 | |
1761 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
1762 // so dll_address_to_library_name() can fall through to use dladdr() which | |
1763 // can figure out executable name from argv[0]. | |
1764 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
1765 d->base = libbase; | |
1766 if (d->fname) { | |
1767 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
1768 } | |
1769 return 1; | |
1770 } | |
1771 return 0; | |
1772 } | |
1773 | |
1774 bool os::dll_address_to_library_name(address addr, char* buf, | |
1775 int buflen, int* offset) { | |
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1776 // buf is not optional, but offset is optional |
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|
1777 assert(buf != NULL, "sanity check"); |
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1778 |
0 | 1779 Dl_info dlinfo; |
1780 struct _address_to_library_name data; | |
1781 | |
1782 // There is a bug in old glibc dladdr() implementation that it could resolve | |
1783 // to wrong library name if the .so file has a base address != NULL. Here | |
1784 // we iterate through the program headers of all loaded libraries to find | |
1785 // out which library 'addr' really belongs to. This workaround can be | |
1786 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
1787 data.addr = addr; | |
1788 data.fname = buf; | |
1789 data.buflen = buflen; | |
1790 data.base = NULL; | |
1791 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
1792 | |
1793 if (rslt) { | |
1794 // buf already contains library name | |
1795 if (offset) *offset = addr - data.base; | |
1796 return true; | |
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|
1797 } |
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1798 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1799 if (dlinfo.dli_fname != NULL) { |
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1800 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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1801 } |
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1802 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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1803 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1804 } |
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1805 return true; |
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1806 } |
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|
1807 |
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1808 buf[0] = '\0'; |
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1809 if (offset) *offset = -1; |
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1810 return false; |
0 | 1811 } |
1812 | |
1813 // Loads .dll/.so and | |
1814 // in case of error it checks if .dll/.so was built for the | |
1815 // same architecture as Hotspot is running on | |
1816 | |
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1817 |
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1818 // Remember the stack's state. The Linux dynamic linker will change |
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1819 // the stack to 'executable' at most once, so we must safepoint only once. |
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1820 bool os::Linux::_stack_is_executable = false; |
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1821 |
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1822 // VM operation that loads a library. This is necessary if stack protection |
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1823 // of the Java stacks can be lost during loading the library. If we |
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1824 // do not stop the Java threads, they can stack overflow before the stacks |
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1825 // are protected again. |
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1826 class VM_LinuxDllLoad: public VM_Operation { |
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1827 private: |
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1828 const char *_filename; |
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1829 char *_ebuf; |
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1830 int _ebuflen; |
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1831 void *_lib; |
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1832 public: |
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1833 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
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1834 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
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1835 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
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1836 void doit() { |
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1837 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
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1838 os::Linux::_stack_is_executable = true; |
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1839 } |
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1840 void* loaded_library() { return _lib; } |
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1841 }; |
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1842 |
0 | 1843 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
1844 { | |
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1845 void * result = NULL; |
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1846 bool load_attempted = false; |
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1847 |
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|
1848 // Check whether the library to load might change execution rights |
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1849 // of the stack. If they are changed, the protection of the stack |
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1850 // guard pages will be lost. We need a safepoint to fix this. |
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1851 // |
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1852 // See Linux man page execstack(8) for more info. |
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1853 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
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1854 ElfFile ef(filename); |
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1855 if (!ef.specifies_noexecstack()) { |
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1856 if (!is_init_completed()) { |
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|
1857 os::Linux::_stack_is_executable = true; |
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1858 // This is OK - No Java threads have been created yet, and hence no |
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1859 // stack guard pages to fix. |
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1860 // |
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1861 // This should happen only when you are building JDK7 using a very |
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1862 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
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1863 // |
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1864 // Dynamic loader will make all stacks executable after |
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1865 // this function returns, and will not do that again. |
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1866 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
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1867 } else { |
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1868 warning("You have loaded library %s which might have disabled stack guard. " |
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1869 "The VM will try to fix the stack guard now.\n" |
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1870 "It's highly recommended that you fix the library with " |
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1871 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
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1872 filename); |
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1873 |
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1874 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
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1875 JavaThread *jt = JavaThread::current(); |
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1876 if (jt->thread_state() != _thread_in_native) { |
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1877 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
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1878 // that requires ExecStack. Cannot enter safe point. Let's give up. |
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1879 warning("Unable to fix stack guard. Giving up."); |
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1880 } else { |
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1881 if (!LoadExecStackDllInVMThread) { |
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1882 // This is for the case where the DLL has an static |
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1883 // constructor function that executes JNI code. We cannot |
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1884 // load such DLLs in the VMThread. |
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1885 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1886 } |
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1887 |
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1888 ThreadInVMfromNative tiv(jt); |
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1889 debug_only(VMNativeEntryWrapper vew;) |
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1890 |
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1891 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1892 VMThread::execute(&op); |
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1893 if (LoadExecStackDllInVMThread) { |
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1894 result = op.loaded_library(); |
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1895 } |
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1896 load_attempted = true; |
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1897 } |
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1898 } |
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1899 } |
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1900 } |
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1901 |
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1902 if (!load_attempted) { |
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1903 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1904 } |
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1905 |
0 | 1906 if (result != NULL) { |
1907 // Successful loading | |
1908 return result; | |
1909 } | |
1910 | |
1911 Elf32_Ehdr elf_head; | |
1912 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1913 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1914 | |
1915 if (diag_msg_max_length==0) { | |
1916 // No more space in ebuf for additional diagnostics message | |
1917 return NULL; | |
1918 } | |
1919 | |
1920 | |
1921 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1922 | |
1923 if (file_descriptor < 0) { | |
1924 // Can't open library, report dlerror() message | |
1925 return NULL; | |
1926 } | |
1927 | |
1928 bool failed_to_read_elf_head= | |
1929 (sizeof(elf_head)!= | |
1930 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1931 | |
1932 ::close(file_descriptor); | |
1933 if (failed_to_read_elf_head) { | |
1934 // file i/o error - report dlerror() msg | |
1935 return NULL; | |
1936 } | |
1937 | |
1938 typedef struct { | |
1939 Elf32_Half code; // Actual value as defined in elf.h | |
1940 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1941 char elf_class; // 32 or 64 bit | |
1942 char endianess; // MSB or LSB | |
1943 char* name; // String representation | |
1944 } arch_t; | |
1945 | |
1946 #ifndef EM_486 | |
1947 #define EM_486 6 /* Intel 80486 */ | |
1948 #endif | |
1949 | |
1950 static const arch_t arch_array[]={ | |
1951 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1952 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1953 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1954 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1955 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1956 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1957 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1958 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1010 | 1959 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
1960 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1961 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1962 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1963 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1964 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1965 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1966 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
0 | 1967 }; |
1968 | |
1969 #if (defined IA32) | |
1970 static Elf32_Half running_arch_code=EM_386; | |
1971 #elif (defined AMD64) | |
1972 static Elf32_Half running_arch_code=EM_X86_64; | |
1973 #elif (defined IA64) | |
1974 static Elf32_Half running_arch_code=EM_IA_64; | |
1975 #elif (defined __sparc) && (defined _LP64) | |
1976 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1977 #elif (defined __sparc) && (!defined _LP64) | |
1978 static Elf32_Half running_arch_code=EM_SPARC; | |
1979 #elif (defined __powerpc64__) | |
1980 static Elf32_Half running_arch_code=EM_PPC64; | |
1981 #elif (defined __powerpc__) | |
1982 static Elf32_Half running_arch_code=EM_PPC; | |
1010 | 1983 #elif (defined ARM) |
1984 static Elf32_Half running_arch_code=EM_ARM; | |
1985 #elif (defined S390) | |
1986 static Elf32_Half running_arch_code=EM_S390; | |
1987 #elif (defined ALPHA) | |
1988 static Elf32_Half running_arch_code=EM_ALPHA; | |
1989 #elif (defined MIPSEL) | |
1990 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1991 #elif (defined PARISC) | |
1992 static Elf32_Half running_arch_code=EM_PARISC; | |
1993 #elif (defined MIPS) | |
1994 static Elf32_Half running_arch_code=EM_MIPS; | |
1995 #elif (defined M68K) | |
1996 static Elf32_Half running_arch_code=EM_68K; | |
0 | 1997 #else |
1998 #error Method os::dll_load requires that one of following is defined:\ | |
1010 | 1999 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
0 | 2000 #endif |
2001 | |
2002 // Identify compatability class for VM's architecture and library's architecture | |
2003 // Obtain string descriptions for architectures | |
2004 | |
2005 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
2006 int running_arch_index=-1; | |
2007 | |
2008 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
2009 if (running_arch_code == arch_array[i].code) { | |
2010 running_arch_index = i; | |
2011 } | |
2012 if (lib_arch.code == arch_array[i].code) { | |
2013 lib_arch.compat_class = arch_array[i].compat_class; | |
2014 lib_arch.name = arch_array[i].name; | |
2015 } | |
2016 } | |
2017 | |
2018 assert(running_arch_index != -1, | |
2019 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
2020 if (running_arch_index == -1) { | |
2021 // Even though running architecture detection failed | |
2022 // we may still continue with reporting dlerror() message | |
2023 return NULL; | |
2024 } | |
2025 | |
2026 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
2027 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
2028 return NULL; | |
2029 } | |
2030 | |
1010 | 2031 #ifndef S390 |
0 | 2032 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
2033 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
2034 return NULL; | |
2035 } | |
1010 | 2036 #endif // !S390 |
0 | 2037 |
2038 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
2039 if ( lib_arch.name!=NULL ) { | |
2040 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2041 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
2042 lib_arch.name, arch_array[running_arch_index].name); | |
2043 } else { | |
2044 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2045 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
2046 lib_arch.code, | |
2047 arch_array[running_arch_index].name); | |
2048 } | |
2049 } | |
2050 | |
2051 return NULL; | |
2052 } | |
2053 | |
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2054 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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2055 void * result = ::dlopen(filename, RTLD_LAZY); |
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2056 if (result == NULL) { |
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2057 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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2058 ebuf[ebuflen-1] = '\0'; |
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2059 } |
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2060 return result; |
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2061 } |
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2062 |
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2063 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
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2064 void * result = NULL; |
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2065 if (LoadExecStackDllInVMThread) { |
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2066 result = dlopen_helper(filename, ebuf, ebuflen); |
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2067 } |
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2068 |
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2069 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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2070 // library that requires an executable stack, or which does not have this |
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2071 // stack attribute set, dlopen changes the stack attribute to executable. The |
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2072 // read protection of the guard pages gets lost. |
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2073 // |
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2074 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
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2075 // may have been queued at the same time. |
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2076 |
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2077 if (!_stack_is_executable) { |
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2078 JavaThread *jt = Threads::first(); |
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2079 |
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2080 while (jt) { |
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2081 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
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2082 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
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2083 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
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2084 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
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2085 warning("Attempt to reguard stack yellow zone failed."); |
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2086 } |
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2087 } |
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2088 jt = jt->next(); |
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2089 } |
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2090 } |
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2091 |
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2092 return result; |
9058789475af
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|
2093 } |
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2094 |
242 | 2095 /* |
2096 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
2097 * chances are you might want to run the generated bits against glibc-2.0 | |
2098 * libdl.so, so always use locking for any version of glibc. | |
2099 */ | |
2100 void* os::dll_lookup(void* handle, const char* name) { | |
2101 pthread_mutex_lock(&dl_mutex); | |
2102 void* res = dlsym(handle, name); | |
2103 pthread_mutex_unlock(&dl_mutex); | |
2104 return res; | |
2105 } | |
0 | 2106 |
2107 | |
1980
828eafbd85cc
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2108 static bool _print_ascii_file(const char* filename, outputStream* st) { |
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|
2109 int fd = ::open(filename, O_RDONLY); |
0 | 2110 if (fd == -1) { |
2111 return false; | |
2112 } | |
2113 | |
2114 char buf[32]; | |
2115 int bytes; | |
1980
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2116 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
0 | 2117 st->print_raw(buf, bytes); |
2118 } | |
2119 | |
1980
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|
2120 ::close(fd); |
0 | 2121 |
2122 return true; | |
2123 } | |
2124 | |
2125 void os::print_dll_info(outputStream *st) { | |
2126 st->print_cr("Dynamic libraries:"); | |
2127 | |
2128 char fname[32]; | |
2129 pid_t pid = os::Linux::gettid(); | |
2130 | |
2131 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
2132 | |
2133 if (!_print_ascii_file(fname, st)) { | |
2134 st->print("Can not get library information for pid = %d\n", pid); | |
2135 } | |
2136 } | |
2137 | |
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2138 void os::print_os_info_brief(outputStream* st) { |
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|
2139 os::Linux::print_distro_info(st); |
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|
2140 |
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|
2141 os::Posix::print_uname_info(st); |
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|
2142 |
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|
2143 os::Linux::print_libversion_info(st); |
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|
2144 |
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|
2145 } |
0 | 2146 |
2147 void os::print_os_info(outputStream* st) { | |
2148 st->print("OS:"); | |
2149 | |
6080
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|
2150 os::Linux::print_distro_info(st); |
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|
2151 |
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|
2152 os::Posix::print_uname_info(st); |
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|
2153 |
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|
2154 // Print warning if unsafe chroot environment detected |
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diff
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|
2155 if (unsafe_chroot_detected) { |
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|
2156 st->print("WARNING!! "); |
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|
2157 st->print_cr(unstable_chroot_error); |
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|
2158 } |
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|
2159 |
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|
2160 os::Linux::print_libversion_info(st); |
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|
2161 |
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|
2162 os::Posix::print_rlimit_info(st); |
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|
2163 |
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7165755: OS Information much longer on linux than other platforms
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|
2164 os::Posix::print_load_average(st); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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|
2165 |
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|
2166 os::Linux::print_full_memory_info(st); |
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|
2167 } |
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diff
changeset
|
2168 |
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|
2169 // Try to identify popular distros. |
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|
2170 // Most Linux distributions have /etc/XXX-release file, which contains |
7432b9db36ff
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|
2171 // the OS version string. Some have more than one /etc/XXX-release file |
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|
2172 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), |
7432b9db36ff
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parents:
5937
diff
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|
2173 // so the order is important. |
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|
2174 void os::Linux::print_distro_info(outputStream* st) { |
0 | 2175 if (!_print_ascii_file("/etc/mandrake-release", st) && |
2176 !_print_ascii_file("/etc/sun-release", st) && | |
2177 !_print_ascii_file("/etc/redhat-release", st) && | |
2178 !_print_ascii_file("/etc/SuSE-release", st) && | |
2179 !_print_ascii_file("/etc/turbolinux-release", st) && | |
2180 !_print_ascii_file("/etc/gentoo-release", st) && | |
1681
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|
2181 !_print_ascii_file("/etc/debian_version", st) && |
126ea7725993
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diff
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|
2182 !_print_ascii_file("/etc/ltib-release", st) && |
126ea7725993
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bobv
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diff
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|
2183 !_print_ascii_file("/etc/angstrom-version", st)) { |
0 | 2184 st->print("Linux"); |
2185 } | |
2186 st->cr(); | |
6080
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|
2187 } |
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diff
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|
2188 |
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|
2189 void os::Linux::print_libversion_info(outputStream* st) { |
0 | 2190 // libc, pthread |
2191 st->print("libc:"); | |
2192 st->print(os::Linux::glibc_version()); st->print(" "); | |
2193 st->print(os::Linux::libpthread_version()); st->print(" "); | |
2194 if (os::Linux::is_LinuxThreads()) { | |
2195 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
2196 } | |
2197 st->cr(); | |
6080
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|
2198 } |
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diff
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|
2199 |
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7165755: OS Information much longer on linux than other platforms
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|
2200 void os::Linux::print_full_memory_info(outputStream* st) { |
7432b9db36ff
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5937
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|
2201 st->print("\n/proc/meminfo:\n"); |
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5937
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|
2202 _print_ascii_file("/proc/meminfo", st); |
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diff
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|
2203 st->cr(); |
3800
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
parents:
3358
diff
changeset
|
2204 } |
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
parents:
3358
diff
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|
2205 |
0 | 2206 void os::print_memory_info(outputStream* st) { |
2207 | |
2208 st->print("Memory:"); | |
2209 st->print(" %dk page", os::vm_page_size()>>10); | |
2210 | |
2211 // values in struct sysinfo are "unsigned long" | |
2212 struct sysinfo si; | |
2213 sysinfo(&si); | |
2214 | |
2215 st->print(", physical " UINT64_FORMAT "k", | |
2216 os::physical_memory() >> 10); | |
2217 st->print("(" UINT64_FORMAT "k free)", | |
2218 os::available_memory() >> 10); | |
2219 st->print(", swap " UINT64_FORMAT "k", | |
2220 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
2221 st->print("(" UINT64_FORMAT "k free)", | |
2222 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
2223 st->cr(); | |
2224 } | |
2225 | |
6080
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5937
diff
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|
2226 void os::pd_print_cpu_info(outputStream* st) { |
7432b9db36ff
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5937
diff
changeset
|
2227 st->print("\n/proc/cpuinfo:\n"); |
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5937
diff
changeset
|
2228 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
7432b9db36ff
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parents:
5937
diff
changeset
|
2229 st->print(" <Not Available>"); |
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5937
diff
changeset
|
2230 } |
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5937
diff
changeset
|
2231 st->cr(); |
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5937
diff
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|
2232 } |
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5937
diff
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|
2233 |
0 | 2234 void os::print_siginfo(outputStream* st, void* siginfo) { |
14410 | 2235 const siginfo_t* si = (const siginfo_t*)siginfo; |
2236 | |
2237 os::Posix::print_siginfo_brief(st, si); | |
2238 | |
2239 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
0 | 2240 UseSharedSpaces) { |
2241 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
2242 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
2243 st->print("\n\nError accessing class data sharing archive." \ | |
2244 " Mapped file inaccessible during execution, " \ | |
2245 " possible disk/network problem."); | |
2246 } | |
2247 } | |
2248 st->cr(); | |
2249 } | |
2250 | |
2251 | |
2252 static void print_signal_handler(outputStream* st, int sig, | |
2253 char* buf, size_t buflen); | |
2254 | |
2255 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
2256 st->print_cr("Signal Handlers:"); | |
2257 print_signal_handler(st, SIGSEGV, buf, buflen); | |
2258 print_signal_handler(st, SIGBUS , buf, buflen); | |
2259 print_signal_handler(st, SIGFPE , buf, buflen); | |
2260 print_signal_handler(st, SIGPIPE, buf, buflen); | |
2261 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
2262 print_signal_handler(st, SIGILL , buf, buflen); | |
2263 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
2264 print_signal_handler(st, SR_signum, buf, buflen); | |
2265 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
2266 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
2267 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
2268 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
2269 } | |
2270 | |
2271 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
2272 | |
7456
7d42f3b08300
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7206
diff
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|
2273 // Find the full path to the current module, libjvm.so |
1642 | 2274 void os::jvm_path(char *buf, jint buflen) { |
0 | 2275 // Error checking. |
1642 | 2276 if (buflen < MAXPATHLEN) { |
0 | 2277 assert(false, "must use a large-enough buffer"); |
2278 buf[0] = '\0'; | |
2279 return; | |
2280 } | |
2281 // Lazy resolve the path to current module. | |
2282 if (saved_jvm_path[0] != 0) { | |
2283 strcpy(buf, saved_jvm_path); | |
2284 return; | |
2285 } | |
2286 | |
2287 char dli_fname[MAXPATHLEN]; | |
2288 bool ret = dll_address_to_library_name( | |
2289 CAST_FROM_FN_PTR(address, os::jvm_path), | |
2290 dli_fname, sizeof(dli_fname), NULL); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
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|
2291 assert(ret, "cannot locate libjvm"); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2292 char *rp = NULL; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2293 if (ret && dli_fname[0] != '\0') { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2294 rp = realpath(dli_fname, buf); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
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|
2295 } |
1681
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|
2296 if (rp == NULL) |
513
2328d1d3f8cf
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477
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|
2297 return; |
0 | 2298 |
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
sla
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2204
diff
changeset
|
2299 if (Arguments::created_by_gamma_launcher()) { |
0 | 2300 // Support for the gamma launcher. Typical value for buf is |
2301 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
2302 // the right place in the string, then assume we are installed in a JDK and | |
2303 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
2304 // up the path so it looks like libjvm.so is installed there (append a | |
2305 // fake suffix hotspot/libjvm.so). | |
2306 const char *p = buf + strlen(buf) - 1; | |
2307 for (int count = 0; p > buf && count < 5; ++count) { | |
2308 for (--p; p > buf && *p != '/'; --p) | |
2309 /* empty */ ; | |
2310 } | |
2311 | |
2312 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
2313 // Look for JAVA_HOME in the environment. | |
2314 char* java_home_var = ::getenv("JAVA_HOME"); | |
2315 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1642 | 2316 char* jrelib_p; |
2317 int len; | |
2318 | |
7456
7d42f3b08300
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7206
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|
2319 // Check the current module name "libjvm.so". |
0 | 2320 p = strrchr(buf, '/'); |
2321 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
2322 | |
1681
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|
2323 rp = realpath(java_home_var, buf); |
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|
2324 if (rp == NULL) |
513
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diff
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|
2325 return; |
1642 | 2326 |
2327 // determine if this is a legacy image or modules image | |
2328 // modules image doesn't have "jre" subdirectory | |
2329 len = strlen(buf); | |
2330 jrelib_p = buf + len; | |
2331 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
2332 if (0 != access(buf, F_OK)) { | |
2333 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
2334 } | |
2335 | |
0 | 2336 if (0 == access(buf, F_OK)) { |
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7206
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|
2337 // Use current module name "libjvm.so" |
1642 | 2338 len = strlen(buf); |
7456
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7206
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|
2339 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
0 | 2340 } else { |
2341 // Go back to path of .so | |
1681
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1642
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|
2342 rp = realpath(dli_fname, buf); |
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|
2343 if (rp == NULL) |
513
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|
2344 return; |
0 | 2345 } |
2346 } | |
2347 } | |
2348 } | |
2349 | |
2350 strcpy(saved_jvm_path, buf); | |
2351 } | |
2352 | |
2353 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
2354 // no prefix required, not even "_" | |
2355 } | |
2356 | |
2357 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
2358 // no suffix required | |
2359 } | |
2360 | |
2361 //////////////////////////////////////////////////////////////////////////////// | |
2362 // sun.misc.Signal support | |
2363 | |
2364 static volatile jint sigint_count = 0; | |
2365 | |
2366 static void | |
2367 UserHandler(int sig, void *siginfo, void *context) { | |
2368 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
2369 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
2370 // don't want to flood the manager thread with sem_post requests. | |
2371 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
2372 return; | |
2373 | |
2374 // Ctrl-C is pressed during error reporting, likely because the error | |
2375 // handler fails to abort. Let VM die immediately. | |
2376 if (sig == SIGINT && is_error_reported()) { | |
2377 os::die(); | |
2378 } | |
2379 | |
2380 os::signal_notify(sig); | |
2381 } | |
2382 | |
2383 void* os::user_handler() { | |
2384 return CAST_FROM_FN_PTR(void*, UserHandler); | |
2385 } | |
2386 | |
10405 | 2387 class Semaphore : public StackObj { |
2388 public: | |
2389 Semaphore(); | |
2390 ~Semaphore(); | |
2391 void signal(); | |
2392 void wait(); | |
2393 bool trywait(); | |
2394 bool timedwait(unsigned int sec, int nsec); | |
2395 private: | |
2396 sem_t _semaphore; | |
2397 }; | |
2398 | |
2399 | |
2400 Semaphore::Semaphore() { | |
2401 sem_init(&_semaphore, 0, 0); | |
2402 } | |
2403 | |
2404 Semaphore::~Semaphore() { | |
2405 sem_destroy(&_semaphore); | |
2406 } | |
2407 | |
2408 void Semaphore::signal() { | |
2409 sem_post(&_semaphore); | |
2410 } | |
2411 | |
2412 void Semaphore::wait() { | |
2413 sem_wait(&_semaphore); | |
2414 } | |
2415 | |
2416 bool Semaphore::trywait() { | |
2417 return sem_trywait(&_semaphore) == 0; | |
2418 } | |
2419 | |
2420 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
2421 struct timespec ts; | |
2422 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); | |
2423 | |
2424 while (1) { | |
2425 int result = sem_timedwait(&_semaphore, &ts); | |
2426 if (result == 0) { | |
2427 return true; | |
2428 } else if (errno == EINTR) { | |
2429 continue; | |
2430 } else if (errno == ETIMEDOUT) { | |
2431 return false; | |
2432 } else { | |
2433 return false; | |
2434 } | |
2435 } | |
2436 } | |
2437 | |
0 | 2438 extern "C" { |
2439 typedef void (*sa_handler_t)(int); | |
2440 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
2441 } | |
2442 | |
2443 void* os::signal(int signal_number, void* handler) { | |
2444 struct sigaction sigAct, oldSigAct; | |
2445 | |
2446 sigfillset(&(sigAct.sa_mask)); | |
2447 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
2448 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
2449 | |
2450 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
2451 // -1 means registration failed | |
2452 return (void *)-1; | |
2453 } | |
2454 | |
2455 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
2456 } | |
2457 | |
2458 void os::signal_raise(int signal_number) { | |
2459 ::raise(signal_number); | |
2460 } | |
2461 | |
2462 /* | |
2463 * The following code is moved from os.cpp for making this | |
2464 * code platform specific, which it is by its very nature. | |
2465 */ | |
2466 | |
2467 // Will be modified when max signal is changed to be dynamic | |
2468 int os::sigexitnum_pd() { | |
2469 return NSIG; | |
2470 } | |
2471 | |
2472 // a counter for each possible signal value | |
2473 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
2474 | |
2475 // Linux(POSIX) specific hand shaking semaphore. | |
2476 static sem_t sig_sem; | |
10405 | 2477 static Semaphore sr_semaphore; |
0 | 2478 |
2479 void os::signal_init_pd() { | |
2480 // Initialize signal structures | |
2481 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2482 | |
2483 // Initialize signal semaphore | |
2484 ::sem_init(&sig_sem, 0, 0); | |
2485 } | |
2486 | |
2487 void os::signal_notify(int sig) { | |
2488 Atomic::inc(&pending_signals[sig]); | |
2489 ::sem_post(&sig_sem); | |
2490 } | |
2491 | |
2492 static int check_pending_signals(bool wait) { | |
2493 Atomic::store(0, &sigint_count); | |
2494 for (;;) { | |
2495 for (int i = 0; i < NSIG + 1; i++) { | |
2496 jint n = pending_signals[i]; | |
2497 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2498 return i; | |
2499 } | |
2500 } | |
2501 if (!wait) { | |
2502 return -1; | |
2503 } | |
2504 JavaThread *thread = JavaThread::current(); | |
2505 ThreadBlockInVM tbivm(thread); | |
2506 | |
2507 bool threadIsSuspended; | |
2508 do { | |
2509 thread->set_suspend_equivalent(); | |
2510 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2511 ::sem_wait(&sig_sem); | |
2512 | |
2513 // were we externally suspended while we were waiting? | |
2514 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2515 if (threadIsSuspended) { | |
2516 // | |
2517 // The semaphore has been incremented, but while we were waiting | |
2518 // another thread suspended us. We don't want to continue running | |
2519 // while suspended because that would surprise the thread that | |
2520 // suspended us. | |
2521 // | |
2522 ::sem_post(&sig_sem); | |
2523 | |
2524 thread->java_suspend_self(); | |
2525 } | |
2526 } while (threadIsSuspended); | |
2527 } | |
2528 } | |
2529 | |
2530 int os::signal_lookup() { | |
2531 return check_pending_signals(false); | |
2532 } | |
2533 | |
2534 int os::signal_wait() { | |
2535 return check_pending_signals(true); | |
2536 } | |
2537 | |
2538 //////////////////////////////////////////////////////////////////////////////// | |
2539 // Virtual Memory | |
2540 | |
2541 int os::vm_page_size() { | |
2542 // Seems redundant as all get out | |
2543 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2544 return os::Linux::page_size(); | |
2545 } | |
2546 | |
2547 // Solaris allocates memory by pages. | |
2548 int os::vm_allocation_granularity() { | |
2549 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2550 return os::Linux::page_size(); | |
2551 } | |
2552 | |
2553 // Rationale behind this function: | |
2554 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2555 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2556 // samples for JITted code. Here we create private executable mapping over the code cache | |
2557 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2558 // info for the reporting script by storing timestamp and location of symbol | |
2559 void linux_wrap_code(char* base, size_t size) { | |
2560 static volatile jint cnt = 0; | |
2561 | |
2562 if (!UseOprofile) { | |
2563 return; | |
2564 } | |
2565 | |
1497
96d554193f72
6944822: Fix for 6938627 exposes problem with hard-coded buffer sizes
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diff
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|
2566 char buf[PATH_MAX+1]; |
0 | 2567 int num = Atomic::add(1, &cnt); |
2568 | |
1353
a2ea687fdc7c
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1325
diff
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|
2569 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
a2ea687fdc7c
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diff
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|
2570 os::get_temp_directory(), os::current_process_id(), num); |
0 | 2571 unlink(buf); |
2572 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
2573 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
0 | 2574 |
2575 if (fd != -1) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
2576 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
0 | 2577 if (rv != (off_t)-1) { |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
2578 if (::write(fd, "", 1) == 1) { |
0 | 2579 mmap(base, size, |
2580 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2581 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2582 } | |
2583 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
2584 ::close(fd); |
0 | 2585 unlink(buf); |
2586 } | |
2587 } | |
2588 | |
10969
a837fa3d3f86
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|
2589 static bool recoverable_mmap_error(int err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2590 // See if the error is one we can let the caller handle. This |
a837fa3d3f86
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|
2591 // list of errno values comes from JBS-6843484. I can't find a |
a837fa3d3f86
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diff
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|
2592 // Linux man page that documents this specific set of errno |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2593 // values so while this list currently matches Solaris, it may |
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|
2594 // change as we gain experience with this failure mode. |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2595 switch (err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2596 case EBADF: |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2597 case EINVAL: |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2598 case ENOTSUP: |
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diff
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|
2599 // let the caller deal with these errors |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2600 return true; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2601 |
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|
2602 default: |
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diff
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|
2603 // Any remaining errors on this OS can cause our reserved mapping |
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diff
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|
2604 // to be lost. That can cause confusion where different data |
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diff
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|
2605 // structures think they have the same memory mapped. The worst |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2606 // scenario is if both the VM and a library think they have the |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2607 // same memory mapped. |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2608 return false; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2609 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2610 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2611 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2612 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2613 int err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2614 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2615 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2616 strerror(err), err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2617 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2618 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
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|
2619 static void warn_fail_commit_memory(char* addr, size_t size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2620 size_t alignment_hint, bool exec, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2621 int err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2622 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2623 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2624 alignment_hint, exec, strerror(err), err); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2625 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2626 |
0 | 2627 // NOTE: Linux kernel does not really reserve the pages for us. |
2628 // All it does is to check if there are enough free pages | |
2629 // left at the time of mmap(). This could be a potential | |
2630 // problem. | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2631 int os::Linux::commit_memory_impl(char* addr, size_t size, bool exec) { |
656 | 2632 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2633 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
0 | 2634 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
3885 | 2635 if (res != (uintptr_t) MAP_FAILED) { |
2636 if (UseNUMAInterleaving) { | |
2637 numa_make_global(addr, size); | |
2638 } | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2639 return 0; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
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|
2640 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
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10405
diff
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|
2641 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
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|
2642 int err = errno; // save errno from mmap() call above |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2643 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2644 if (!recoverable_mmap_error(err)) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2645 warn_fail_commit_memory(addr, size, exec, err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2646 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "committing reserved memory."); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
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|
2647 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2648 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2649 return err; |
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10405
diff
changeset
|
2650 } |
a837fa3d3f86
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diff
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|
2651 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2652 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2653 return os::Linux::commit_memory_impl(addr, size, exec) == 0; |
a837fa3d3f86
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diff
changeset
|
2654 } |
a837fa3d3f86
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10405
diff
changeset
|
2655 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2656 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2657 const char* mesg) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2658 assert(mesg != NULL, "mesg must be specified"); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2659 int err = os::Linux::commit_memory_impl(addr, size, exec); |
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2660 if (err != 0) { |
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2661 // the caller wants all commit errors to exit with the specified mesg: |
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2662 warn_fail_commit_memory(addr, size, exec, err); |
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2663 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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2664 } |
0 | 2665 } |
2666 | |
3286
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2667 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
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2668 #ifndef MAP_HUGETLB |
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2669 #define MAP_HUGETLB 0x40000 |
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2670 #endif |
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2671 |
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2672 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. |
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2673 #ifndef MADV_HUGEPAGE |
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2674 #define MADV_HUGEPAGE 14 |
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2675 #endif |
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2676 |
10969
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2677 int os::Linux::commit_memory_impl(char* addr, size_t size, |
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2678 size_t alignment_hint, bool exec) { |
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|
2679 int err; |
3286
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2680 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
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2681 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
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2682 uintptr_t res = |
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2683 (uintptr_t) ::mmap(addr, size, prot, |
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2684 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, |
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2685 -1, 0); |
3885 | 2686 if (res != (uintptr_t) MAP_FAILED) { |
2687 if (UseNUMAInterleaving) { | |
2688 numa_make_global(addr, size); | |
2689 } | |
10969
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2690 return 0; |
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2691 } |
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2692 |
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2693 err = errno; // save errno from mmap() call above |
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2694 |
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2695 if (!recoverable_mmap_error(err)) { |
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2696 // However, it is not clear that this loss of our reserved mapping |
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2697 // happens with large pages on Linux or that we cannot recover |
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2698 // from the loss. For now, we just issue a warning and we don't |
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|
2699 // call vm_exit_out_of_memory(). This issue is being tracked by |
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2700 // JBS-8007074. |
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2701 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
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2702 // vm_exit_out_of_memory(size, OOM_MMAP_ERROR, |
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|
2703 // "committing reserved memory."); |
3885 | 2704 } |
3913
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2705 // Fall through and try to use small pages |
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|
2706 } |
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|
2707 |
10969
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|
2708 err = os::Linux::commit_memory_impl(addr, size, exec); |
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2709 if (err == 0) { |
3913
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2710 realign_memory(addr, size, alignment_hint); |
10969
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2711 } |
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2712 return err; |
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2713 } |
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2714 |
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|
2715 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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|
2716 bool exec) { |
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2717 return os::Linux::commit_memory_impl(addr, size, alignment_hint, exec) == 0; |
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|
2718 } |
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|
2719 |
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|
2720 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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|
2721 size_t alignment_hint, bool exec, |
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|
2722 const char* mesg) { |
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|
2723 assert(mesg != NULL, "mesg must be specified"); |
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|
2724 int err = os::Linux::commit_memory_impl(addr, size, alignment_hint, exec); |
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|
2725 if (err != 0) { |
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|
2726 // the caller wants all commit errors to exit with the specified mesg: |
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|
2727 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
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|
2728 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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|
2729 } |
0 | 2730 } |
2731 | |
6197 | 2732 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3286
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2733 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
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2734 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
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2735 // be supported or the memory may already be backed by huge pages. |
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|
2736 ::madvise(addr, bytes, MADV_HUGEPAGE); |
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|
2737 } |
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|
2738 } |
141 | 2739 |
6197 | 2740 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
5937
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|
2741 // This method works by doing an mmap over an existing mmaping and effectively discarding |
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|
2742 // the existing pages. However it won't work for SHM-based large pages that cannot be |
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|
2743 // uncommitted at all. We don't do anything in this case to avoid creating a segment with |
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|
2744 // small pages on top of the SHM segment. This method always works for small pages, so we |
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|
2745 // allow that in any case. |
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|
2746 if (alignment_hint <= (size_t)os::vm_page_size() || !UseSHM) { |
10969
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|
2747 commit_memory(addr, bytes, alignment_hint, !ExecMem); |
5937
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|
2748 } |
141 | 2749 } |
2750 | |
462
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|
2751 void os::numa_make_global(char *addr, size_t bytes) { |
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2752 Linux::numa_interleave_memory(addr, bytes); |
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2753 } |
141 | 2754 |
2755 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2756 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); | |
2757 } | |
2758 | |
2759 bool os::numa_topology_changed() { return false; } | |
2760 | |
2761 size_t os::numa_get_groups_num() { | |
2762 int max_node = Linux::numa_max_node(); | |
2763 return max_node > 0 ? max_node + 1 : 1; | |
2764 } | |
2765 | |
2766 int os::numa_get_group_id() { | |
2767 int cpu_id = Linux::sched_getcpu(); | |
2768 if (cpu_id != -1) { | |
2769 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
2770 if (lgrp_id != -1) { | |
2771 return lgrp_id; | |
2772 } | |
0 | 2773 } |
2774 return 0; | |
2775 } | |
2776 | |
141 | 2777 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
2778 for (size_t i = 0; i < size; i++) { | |
2779 ids[i] = i; | |
2780 } | |
2781 return size; | |
2782 } | |
2783 | |
0 | 2784 bool os::get_page_info(char *start, page_info* info) { |
2785 return false; | |
2786 } | |
2787 | |
2788 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2789 return end; | |
2790 } | |
2791 | |
3826 | 2792 |
2793 int os::Linux::sched_getcpu_syscall(void) { | |
2794 unsigned int cpu; | |
2795 int retval = -1; | |
2796 | |
2797 #if defined(IA32) | |
3887
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|
2798 # ifndef SYS_getcpu |
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|
2799 # define SYS_getcpu 318 |
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|
2800 # endif |
3826 | 2801 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
2802 #elif defined(AMD64) | |
3887
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|
2803 // Unfortunately we have to bring all these macros here from vsyscall.h |
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|
2804 // to be able to compile on old linuxes. |
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|
2805 # define __NR_vgetcpu 2 |
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|
2806 # define VSYSCALL_START (-10UL << 20) |
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|
2807 # define VSYSCALL_SIZE 1024 |
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|
2808 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
3826 | 2809 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
2810 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
2811 retval = vgetcpu(&cpu, NULL, NULL); | |
2812 #endif | |
2813 | |
2814 return (retval == -1) ? retval : cpu; | |
2815 } | |
2816 | |
2191 | 2817 // Something to do with the numa-aware allocator needs these symbols |
2818 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
2819 extern "C" JNIEXPORT void numa_error(char *where) { } | |
2820 extern "C" JNIEXPORT int fork1() { return fork(); } | |
141 | 2821 |
763
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|
2822 |
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|
2823 // If we are running with libnuma version > 2, then we should |
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|
2824 // be trying to use symbols with versions 1.1 |
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|
2825 // If we are running with earlier version, which did not have symbol versions, |
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|
2826 // we should use the base version. |
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|
2827 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
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2828 void *f = dlvsym(handle, name, "libnuma_1.1"); |
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2829 if (f == NULL) { |
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2830 f = dlsym(handle, name); |
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|
2831 } |
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|
2832 return f; |
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|
2833 } |
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2834 |
462
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2835 bool os::Linux::libnuma_init() { |
141 | 2836 // sched_getcpu() should be in libc. |
2837 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
2838 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
2839 | |
3826 | 2840 // If it's not, try a direct syscall. |
2841 if (sched_getcpu() == -1) | |
2842 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
2843 | |
141 | 2844 if (sched_getcpu() != -1) { // Does it work? |
267
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|
2845 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
141 | 2846 if (handle != NULL) { |
2847 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
763
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2848 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
141 | 2849 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
763
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2850 libnuma_dlsym(handle, "numa_max_node"))); |
141 | 2851 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
763
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2852 libnuma_dlsym(handle, "numa_available"))); |
141 | 2853 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
763
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2854 libnuma_dlsym(handle, "numa_tonode_memory"))); |
462
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2855 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
763
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2856 libnuma_dlsym(handle, "numa_interleave_memory"))); |
462
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2857 |
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2858 |
141 | 2859 if (numa_available() != -1) { |
763
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2860 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
141 | 2861 // Create a cpu -> node mapping |
6197 | 2862 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
141 | 2863 rebuild_cpu_to_node_map(); |
462
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2864 return true; |
141 | 2865 } |
2866 } | |
2867 } | |
462
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2868 return false; |
141 | 2869 } |
2870 | |
2871 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
2872 // The table is later used in get_node_by_cpu(). | |
2873 void os::Linux::rebuild_cpu_to_node_map() { | |
462
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2874 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
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2875 // in libnuma (possible values are starting from 16, |
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2876 // and continuing up with every other power of 2, but less |
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|
2877 // than the maximum number of CPUs supported by kernel), and |
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|
2878 // is a subject to change (in libnuma version 2 the requirements |
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|
2879 // are more reasonable) we'll just hardcode the number they use |
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|
2880 // in the library. |
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|
2881 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
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|
2882 |
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|
2883 size_t cpu_num = os::active_processor_count(); |
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|
2884 size_t cpu_map_size = NCPUS / BitsPerCLong; |
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|
2885 size_t cpu_map_valid_size = |
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2886 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2887 |
141 | 2888 cpu_to_node()->clear(); |
2889 cpu_to_node()->at_grow(cpu_num - 1); | |
462
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|
2890 size_t node_num = numa_get_groups_num(); |
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|
2891 |
6197 | 2892 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
462
85f1b9537f70
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|
2893 for (size_t i = 0; i < node_num; i++) { |
141 | 2894 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2895 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
141 | 2896 if (cpu_map[j] != 0) { |
462
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2897 for (size_t k = 0; k < BitsPerCLong; k++) { |
141 | 2898 if (cpu_map[j] & (1UL << k)) { |
462
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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changeset
|
2899 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
141 | 2900 } |
2901 } | |
2902 } | |
2903 } | |
2904 } | |
2905 } | |
6197 | 2906 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
141 | 2907 } |
2908 | |
2909 int os::Linux::get_node_by_cpu(int cpu_id) { | |
2910 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
2911 return cpu_to_node()->at(cpu_id); | |
2912 } | |
2913 return -1; | |
2914 } | |
2915 | |
2916 GrowableArray<int>* os::Linux::_cpu_to_node; | |
2917 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
2918 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
2919 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
2920 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
2921 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2922 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2923 unsigned long* os::Linux::_numa_all_nodes; |
141 | 2924 |
6197 | 2925 bool os::pd_uncommit_memory(char* addr, size_t size) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2926 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2927 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2928 return res != (uintptr_t) MAP_FAILED; |
0 | 2929 } |
2930 | |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2931 // Linux uses a growable mapping for the stack, and if the mapping for |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2932 // the stack guard pages is not removed when we detach a thread the |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2933 // stack cannot grow beyond the pages where the stack guard was |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
2934 // mapped. If at some point later in the process the stack expands to |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2935 // that point, the Linux kernel cannot expand the stack any further |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2936 // because the guard pages are in the way, and a segfault occurs. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2937 // |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
2938 // However, it's essential not to split the stack region by unmapping |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2939 // a region (leaving a hole) that's already part of the stack mapping, |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2940 // so if the stack mapping has already grown beyond the guard pages at |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2941 // the time we create them, we have to truncate the stack mapping. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
2942 // So, we need to know the extent of the stack mapping when |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2943 // create_stack_guard_pages() is called. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
changeset
|
2944 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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changeset
|
2945 // Find the bounds of the stack mapping. Return true for success. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2946 // |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2947 // We only need this for stacks that are growable: at the time of |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
2948 // writing thread stacks don't use growable mappings (i.e. those |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
2949 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2950 // only applies to the main thread. |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
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|
2951 |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2952 static |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2953 bool get_stack_bounds(uintptr_t *bottom, uintptr_t *top) { |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
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|
2954 |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2955 char buf[128]; |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2956 int fd, sz; |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2957 |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2958 if ((fd = ::open("/proc/self/maps", O_RDONLY)) < 0) { |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
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|
2959 return false; |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2960 } |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2961 |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2962 const char kw[] = "[stack]"; |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
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|
2963 const int kwlen = sizeof(kw)-1; |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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2302
diff
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|
2964 |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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2302
diff
changeset
|
2965 // Address part of /proc/self/maps couldn't be more than 128 bytes |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
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|
2966 while ((sz = os::get_line_chars(fd, buf, sizeof(buf))) > 0) { |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2967 if (sz > kwlen && ::memcmp(buf+sz-kwlen, kw, kwlen) == 0) { |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2968 // Extract addresses |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2969 if (sscanf(buf, "%" SCNxPTR "-%" SCNxPTR, bottom, top) == 2) { |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2970 uintptr_t sp = (uintptr_t) __builtin_frame_address(0); |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2971 if (sp >= *bottom && sp <= *top) { |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2972 ::close(fd); |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2973 return true; |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
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|
2974 } |
1320
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6929067: Stack guard pages should be removed when thread is detached
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|
2975 } |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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diff
changeset
|
2976 } |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
2977 } |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2978 |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
diff
changeset
|
2979 ::close(fd); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
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|
2980 return false; |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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diff
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|
2981 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2982 |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2983 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2984 // If the (growable) stack mapping already extends beyond the point |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2985 // where we're going to put our guard pages, truncate the mapping at |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2986 // that point by munmap()ping it. This ensures that when we later |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2987 // munmap() the guard pages we don't leave a hole in the stack |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2988 // mapping. This only affects the main/initial thread, but guard |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2989 // against future OS changes |
6197 | 2990 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2991 uintptr_t stack_extent, stack_base; |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2992 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2993 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2994 assert(os::Linux::is_initial_thread(), |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2995 "growable stack in non-initial thread"); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2996 if (stack_extent < (uintptr_t)addr) |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2997 ::munmap((void*)stack_extent, (uintptr_t)addr - stack_extent); |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2998 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2999 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3000 return os::commit_memory(addr, size, !ExecMem); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3001 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3002 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3003 // If this is a growable mapping, remove the guard pages entirely by |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3004 // munmap()ping them. If not, just call uncommit_memory(). This only |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3005 // affects the main/initial thread, but guard against future OS changes |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3006 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3007 uintptr_t stack_extent, stack_base; |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3008 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3009 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3010 assert(os::Linux::is_initial_thread(), |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3011 "growable stack in non-initial thread"); |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3012 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3013 return ::munmap(addr, size) == 0; |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3014 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3015 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3016 return os::uncommit_memory(addr, size); |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3017 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3018 |
0 | 3019 static address _highest_vm_reserved_address = NULL; |
3020 | |
3021 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
3022 // at 'requested_addr'. If there are existing memory mappings at the same | |
3023 // location, however, they will be overwritten. If 'fixed' is false, | |
3024 // 'requested_addr' is only treated as a hint, the return value may or | |
3025 // may not start from the requested address. Unlike Linux mmap(), this | |
3026 // function returns NULL to indicate failure. | |
3027 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
3028 char * addr; | |
3029 int flags; | |
3030 | |
3031 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
3032 if (fixed) { | |
3033 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
3034 flags |= MAP_FIXED; | |
3035 } | |
3036 | |
10157 | 3037 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
3038 // touch an uncommitted page. Otherwise, the read/write might | |
3039 // succeed if we have enough swap space to back the physical page. | |
3040 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
0 | 3041 flags, -1, 0); |
3042 | |
3043 if (addr != MAP_FAILED) { | |
3044 // anon_mmap() should only get called during VM initialization, | |
3045 // don't need lock (actually we can skip locking even it can be called | |
3046 // from multiple threads, because _highest_vm_reserved_address is just a | |
3047 // hint about the upper limit of non-stack memory regions.) | |
3048 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
3049 _highest_vm_reserved_address = (address)addr + bytes; | |
3050 } | |
3051 } | |
3052 | |
3053 return addr == MAP_FAILED ? NULL : addr; | |
3054 } | |
3055 | |
3056 // Don't update _highest_vm_reserved_address, because there might be memory | |
3057 // regions above addr + size. If so, releasing a memory region only creates | |
3058 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
3059 // | |
3060 static int anon_munmap(char * addr, size_t size) { | |
3061 return ::munmap(addr, size) == 0; | |
3062 } | |
3063 | |
6197 | 3064 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
0 | 3065 size_t alignment_hint) { |
3066 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
3067 } | |
3068 | |
6197 | 3069 bool os::pd_release_memory(char* addr, size_t size) { |
0 | 3070 return anon_munmap(addr, size); |
3071 } | |
3072 | |
3073 static address highest_vm_reserved_address() { | |
3074 return _highest_vm_reserved_address; | |
3075 } | |
3076 | |
3077 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
3078 // Linux wants the mprotect address argument to be page aligned. | |
3079 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
3080 | |
3081 // According to SUSv3, mprotect() should only be used with mappings | |
3082 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
3083 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
3084 // protection of malloc'ed or statically allocated memory). Check the | |
3085 // caller if you hit this assert. | |
3086 assert(addr == bottom, "sanity check"); | |
3087 | |
3088 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
3089 return ::mprotect(bottom, size, prot) == 0; | |
3090 } | |
3091 | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3092 // Set protections specified |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3093 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3094 bool is_committed) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3095 unsigned int p = 0; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3096 switch (prot) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3097 case MEM_PROT_NONE: p = PROT_NONE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3098 case MEM_PROT_READ: p = PROT_READ; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3099 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3100 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3101 default: |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3102 ShouldNotReachHere(); |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3103 } |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3104 // is_committed is unused. |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3105 return linux_mprotect(addr, bytes, p); |
0 | 3106 } |
3107 | |
3108 bool os::guard_memory(char* addr, size_t size) { | |
3109 return linux_mprotect(addr, size, PROT_NONE); | |
3110 } | |
3111 | |
3112 bool os::unguard_memory(char* addr, size_t size) { | |
477
24fda36852ce
6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE
coleenp
parents:
462
diff
changeset
|
3113 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
0 | 3114 } |
3115 | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3116 bool os::Linux::hugetlbfs_sanity_check(bool warn, size_t page_size) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3117 bool result = false; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3118 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3119 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3120 -1, 0); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3121 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3122 if (p != MAP_FAILED) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3123 // We don't know if this really is a huge page or not. |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3124 FILE *fp = fopen("/proc/self/maps", "r"); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3125 if (fp) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3126 while (!feof(fp)) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3127 char chars[257]; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3128 long x = 0; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3129 if (fgets(chars, sizeof(chars), fp)) { |
3358 | 3130 if (sscanf(chars, "%lx-%*x", &x) == 1 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3131 && x == (long)p) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3132 if (strstr (chars, "hugepage")) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3133 result = true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3134 break; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3135 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3136 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3137 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3138 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3139 fclose(fp); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3140 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3141 munmap (p, page_size); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3142 if (result) |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3143 return true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3144 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3145 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3146 if (warn) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3147 warning("HugeTLBFS is not supported by the operating system."); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3148 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3149 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3150 return result; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3151 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3152 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3153 /* |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3154 * Set the coredump_filter bits to include largepages in core dump (bit 6) |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3155 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3156 * From the coredump_filter documentation: |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3157 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3158 * - (bit 0) anonymous private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3159 * - (bit 1) anonymous shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3160 * - (bit 2) file-backed private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3161 * - (bit 3) file-backed shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3162 * - (bit 4) ELF header pages in file-backed private memory areas (it is |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3163 * effective only if the bit 2 is cleared) |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3164 * - (bit 5) hugetlb private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3165 * - (bit 6) hugetlb shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3166 */ |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3167 static void set_coredump_filter(void) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3168 FILE *f; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3169 long cdm; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3170 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3171 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3172 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3173 } |
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diff
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|
3174 |
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diff
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|
3175 if (fscanf(f, "%lx", &cdm) != 1) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
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parents:
2193
diff
changeset
|
3176 fclose(f); |
63d374c54045
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|
3177 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
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2193
diff
changeset
|
3178 } |
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diff
changeset
|
3179 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
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diff
changeset
|
3180 rewind(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
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diff
changeset
|
3181 |
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diff
changeset
|
3182 if ((cdm & LARGEPAGES_BIT) == 0) { |
63d374c54045
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2193
diff
changeset
|
3183 cdm |= LARGEPAGES_BIT; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
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diff
changeset
|
3184 fprintf(f, "%#lx", cdm); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
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diff
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|
3185 } |
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diff
changeset
|
3186 |
63d374c54045
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|
3187 fclose(f); |
63d374c54045
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|
3188 } |
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|
3189 |
0 | 3190 // Large page support |
3191 | |
3192 static size_t _large_page_size = 0; | |
3193 | |
3318
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|
3194 void os::large_page_init() { |
3286
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|
3195 if (!UseLargePages) { |
139667d9836a
7034464: Support transparent large pages on Linux
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|
3196 UseHugeTLBFS = false; |
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3197 UseSHM = false; |
3318
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|
3198 return; |
3286
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|
3199 } |
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|
3200 |
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|
3201 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { |
3318
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3202 // If UseLargePages is specified on the command line try both methods, |
188c9a5d6a6d
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3203 // if it's default, then try only HugeTLBFS. |
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|
3204 if (FLAG_IS_DEFAULT(UseLargePages)) { |
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diff
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|
3205 UseHugeTLBFS = true; |
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diff
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|
3206 } else { |
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|
3207 UseHugeTLBFS = UseSHM = true; |
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|
3208 } |
3286
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|
3209 } |
0 | 3210 |
3211 if (LargePageSizeInBytes) { | |
3212 _large_page_size = LargePageSizeInBytes; | |
3213 } else { | |
3214 // large_page_size on Linux is used to round up heap size. x86 uses either | |
3215 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) | |
3216 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use | |
3217 // page as large as 256M. | |
3218 // | |
3219 // Here we try to figure out page size by parsing /proc/meminfo and looking | |
3220 // for a line with the following format: | |
3221 // Hugepagesize: 2048 kB | |
3222 // | |
3223 // If we can't determine the value (e.g. /proc is not mounted, or the text | |
3224 // format has been changed), we'll use the largest page size supported by | |
3225 // the processor. | |
3226 | |
1010 | 3227 #ifndef ZERO |
1681
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3228 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) |
126ea7725993
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|
3229 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
1010 | 3230 #endif // ZERO |
0 | 3231 |
3232 FILE *fp = fopen("/proc/meminfo", "r"); | |
3233 if (fp) { | |
3234 while (!feof(fp)) { | |
3235 int x = 0; | |
3236 char buf[16]; | |
3237 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { | |
3238 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { | |
3239 _large_page_size = x * K; | |
3240 break; | |
3241 } | |
3242 } else { | |
3243 // skip to next line | |
3244 for (;;) { | |
3245 int ch = fgetc(fp); | |
3246 if (ch == EOF || ch == (int)'\n') break; | |
3247 } | |
3248 } | |
3249 } | |
3250 fclose(fp); | |
3251 } | |
3252 } | |
3253 | |
3286
139667d9836a
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diff
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|
3254 // print a warning if any large page related flag is specified on command line |
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|
3255 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
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|
3256 |
0 | 3257 const size_t default_page_size = (size_t)Linux::page_size(); |
3258 if (_large_page_size > default_page_size) { | |
3259 _page_sizes[0] = _large_page_size; | |
3260 _page_sizes[1] = default_page_size; | |
3261 _page_sizes[2] = 0; | |
3262 } | |
3286
139667d9836a
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|
3263 UseHugeTLBFS = UseHugeTLBFS && |
139667d9836a
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|
3264 Linux::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); |
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|
3265 |
139667d9836a
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diff
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|
3266 if (UseHugeTLBFS) |
139667d9836a
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changeset
|
3267 UseSHM = false; |
139667d9836a
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diff
changeset
|
3268 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
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|
3269 UseLargePages = UseHugeTLBFS || UseSHM; |
139667d9836a
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|
3270 |
2204
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|
3271 set_coredump_filter(); |
0 | 3272 } |
3273 | |
3274 #ifndef SHM_HUGETLB | |
3275 #define SHM_HUGETLB 04000 | |
3276 #endif | |
3277 | |
656 | 3278 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { |
3279 // "exec" is passed in but not used. Creating the shared image for | |
3280 // the code cache doesn't have an SHM_X executable permission to check. | |
3286
139667d9836a
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|
3281 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
0 | 3282 |
3283 key_t key = IPC_PRIVATE; | |
3284 char *addr; | |
3285 | |
3286 bool warn_on_failure = UseLargePages && | |
3287 (!FLAG_IS_DEFAULT(UseLargePages) || | |
3288 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
3289 ); | |
3290 char msg[128]; | |
3291 | |
3292 // Create a large shared memory region to attach to based on size. | |
3293 // Currently, size is the total size of the heap | |
3294 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
3295 if (shmid == -1) { | |
3296 // Possible reasons for shmget failure: | |
3297 // 1. shmmax is too small for Java heap. | |
3298 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
3299 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
3300 // 2. not enough large page memory. | |
3301 // > check available large pages: cat /proc/meminfo | |
3302 // > increase amount of large pages: | |
3303 // echo new_value > /proc/sys/vm/nr_hugepages | |
3304 // Note 1: different Linux may use different name for this property, | |
3305 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
3306 // Note 2: it's possible there's enough physical memory available but | |
3307 // they are so fragmented after a long run that they can't | |
3308 // coalesce into large pages. Try to reserve large pages when | |
3309 // the system is still "fresh". | |
3310 if (warn_on_failure) { | |
3311 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
3312 warning(msg); | |
3313 } | |
3314 return NULL; | |
3315 } | |
3316 | |
3317 // attach to the region | |
1537
79bf863697eb
6951686: Using large pages on Linux prevents zero based compressed oops
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|
3318 addr = (char*)shmat(shmid, req_addr, 0); |
0 | 3319 int err = errno; |
3320 | |
3321 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
3322 // will be deleted when it's detached by shmdt() or when the process | |
3323 // terminates. If shmat() is not successful this will remove the shared | |
3324 // segment immediately. | |
3325 shmctl(shmid, IPC_RMID, NULL); | |
3326 | |
3327 if ((intptr_t)addr == -1) { | |
3328 if (warn_on_failure) { | |
3329 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
3330 warning(msg); | |
3331 } | |
3332 return NULL; | |
3333 } | |
3334 | |
3885 | 3335 if ((addr != NULL) && UseNUMAInterleaving) { |
3336 numa_make_global(addr, bytes); | |
3337 } | |
3338 | |
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
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|
3339 // The memory is committed |
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
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diff
changeset
|
3340 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
zgu
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8710
diff
changeset
|
3341 |
0 | 3342 return addr; |
3343 } | |
3344 | |
3345 bool os::release_memory_special(char* base, size_t bytes) { | |
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10969
diff
changeset
|
3346 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
0 | 3347 // detaching the SHM segment will also delete it, see reserve_memory_special() |
3348 int rslt = shmdt(base); | |
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
zgu
parents:
8710
diff
changeset
|
3349 if (rslt == 0) { |
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10969
diff
changeset
|
3350 tkr.record((address)base, bytes); |
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
zgu
parents:
8710
diff
changeset
|
3351 return true; |
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
zgu
parents:
8710
diff
changeset
|
3352 } else { |
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
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10969
diff
changeset
|
3353 tkr.discard(); |
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
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diff
changeset
|
3354 return false; |
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
zgu
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diff
changeset
|
3355 } |
0 | 3356 } |
3357 | |
3358 size_t os::large_page_size() { | |
3359 return _large_page_size; | |
3360 } | |
3361 | |
3286
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7034464: Support transparent large pages on Linux
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diff
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|
3362 // HugeTLBFS allows application to commit large page memory on demand; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
changeset
|
3363 // with SysV SHM the entire memory region must be allocated as shared |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
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|
3364 // memory. |
0 | 3365 bool os::can_commit_large_page_memory() { |
3286
139667d9836a
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diff
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|
3366 return UseHugeTLBFS; |
0 | 3367 } |
3368 | |
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
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62
diff
changeset
|
3369 bool os::can_execute_large_page_memory() { |
3286
139667d9836a
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diff
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|
3370 return UseHugeTLBFS; |
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
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|
3371 } |
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|
3372 |
0 | 3373 // Reserve memory at an arbitrary address, only if that area is |
3374 // available (and not reserved for something else). | |
3375 | |
6197 | 3376 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
0 | 3377 const int max_tries = 10; |
3378 char* base[max_tries]; | |
3379 size_t size[max_tries]; | |
3380 const size_t gap = 0x000000; | |
3381 | |
3382 // Assert only that the size is a multiple of the page size, since | |
3383 // that's all that mmap requires, and since that's all we really know | |
3384 // about at this low abstraction level. If we need higher alignment, | |
3385 // we can either pass an alignment to this method or verify alignment | |
3386 // in one of the methods further up the call chain. See bug 5044738. | |
3387 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
3388 | |
3389 // Repeatedly allocate blocks until the block is allocated at the | |
3390 // right spot. Give up after max_tries. Note that reserve_memory() will | |
3391 // automatically update _highest_vm_reserved_address if the call is | |
3392 // successful. The variable tracks the highest memory address every reserved | |
3393 // by JVM. It is used to detect heap-stack collision if running with | |
3394 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
3395 // space than needed, it could confuse the collision detecting code. To | |
3396 // solve the problem, save current _highest_vm_reserved_address and | |
3397 // calculate the correct value before return. | |
3398 address old_highest = _highest_vm_reserved_address; | |
3399 | |
3400 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
3401 // if kernel honors the hint then we can return immediately. | |
3402 char * addr = anon_mmap(requested_addr, bytes, false); | |
3403 if (addr == requested_addr) { | |
3404 return requested_addr; | |
3405 } | |
3406 | |
3407 if (addr != NULL) { | |
3408 // mmap() is successful but it fails to reserve at the requested address | |
3409 anon_munmap(addr, bytes); | |
3410 } | |
3411 | |
3412 int i; | |
3413 for (i = 0; i < max_tries; ++i) { | |
3414 base[i] = reserve_memory(bytes); | |
3415 | |
3416 if (base[i] != NULL) { | |
3417 // Is this the block we wanted? | |
3418 if (base[i] == requested_addr) { | |
3419 size[i] = bytes; | |
3420 break; | |
3421 } | |
3422 | |
3423 // Does this overlap the block we wanted? Give back the overlapped | |
3424 // parts and try again. | |
3425 | |
3426 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
3427 if (top_overlap >= 0 && top_overlap < bytes) { | |
3428 unmap_memory(base[i], top_overlap); | |
3429 base[i] += top_overlap; | |
3430 size[i] = bytes - top_overlap; | |
3431 } else { | |
3432 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
3433 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
3434 unmap_memory(requested_addr, bottom_overlap); | |
3435 size[i] = bytes - bottom_overlap; | |
3436 } else { | |
3437 size[i] = bytes; | |
3438 } | |
3439 } | |
3440 } | |
3441 } | |
3442 | |
3443 // Give back the unused reserved pieces. | |
3444 | |
3445 for (int j = 0; j < i; ++j) { | |
3446 if (base[j] != NULL) { | |
3447 unmap_memory(base[j], size[j]); | |
3448 } | |
3449 } | |
3450 | |
3451 if (i < max_tries) { | |
3452 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
3453 return requested_addr; | |
3454 } else { | |
3455 _highest_vm_reserved_address = old_highest; | |
3456 return NULL; | |
3457 } | |
3458 } | |
3459 | |
3460 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
3461 return ::read(fd, buf, nBytes); | |
3462 } | |
3463 | |
3464 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
3465 // Solaris uses poll(), linux uses park(). | |
3466 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
3467 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
3468 // SIGSEGV, see 4355769. | |
3469 | |
3470 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
3471 assert(thread == Thread::current(), "thread consistency check"); | |
3472 | |
3473 ParkEvent * const slp = thread->_SleepEvent ; | |
3474 slp->reset() ; | |
3475 OrderAccess::fence() ; | |
3476 | |
3477 if (interruptible) { | |
3478 jlong prevtime = javaTimeNanos(); | |
3479 | |
3480 for (;;) { | |
3481 if (os::is_interrupted(thread, true)) { | |
3482 return OS_INTRPT; | |
3483 } | |
3484 | |
3485 jlong newtime = javaTimeNanos(); | |
3486 | |
3487 if (newtime - prevtime < 0) { | |
3488 // time moving backwards, should only happen if no monotonic clock | |
3489 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3490 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3491 } else { | |
4712
e7dead7e90af
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diff
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|
3492 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3493 } |
3494 | |
3495 if(millis <= 0) { | |
3496 return OS_OK; | |
3497 } | |
3498 | |
3499 prevtime = newtime; | |
3500 | |
3501 { | |
3502 assert(thread->is_Java_thread(), "sanity check"); | |
3503 JavaThread *jt = (JavaThread *) thread; | |
3504 ThreadBlockInVM tbivm(jt); | |
3505 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
3506 | |
3507 jt->set_suspend_equivalent(); | |
3508 // cleared by handle_special_suspend_equivalent_condition() or | |
3509 // java_suspend_self() via check_and_wait_while_suspended() | |
3510 | |
3511 slp->park(millis); | |
3512 | |
3513 // were we externally suspended while we were waiting? | |
3514 jt->check_and_wait_while_suspended(); | |
3515 } | |
3516 } | |
3517 } else { | |
3518 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
3519 jlong prevtime = javaTimeNanos(); | |
3520 | |
3521 for (;;) { | |
3522 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
3523 // the 1st iteration ... | |
3524 jlong newtime = javaTimeNanos(); | |
3525 | |
3526 if (newtime - prevtime < 0) { | |
3527 // time moving backwards, should only happen if no monotonic clock | |
3528 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3529 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3530 } else { | |
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|
3531 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3532 } |
3533 | |
3534 if(millis <= 0) break ; | |
3535 | |
3536 prevtime = newtime; | |
3537 slp->park(millis); | |
3538 } | |
3539 return OS_OK ; | |
3540 } | |
3541 } | |
3542 | |
3543 int os::naked_sleep() { | |
3544 // %% make the sleep time an integer flag. for now use 1 millisec. | |
3545 return os::sleep(Thread::current(), 1, false); | |
3546 } | |
3547 | |
3548 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
3549 void os::infinite_sleep() { | |
3550 while (true) { // sleep forever ... | |
3551 ::sleep(100); // ... 100 seconds at a time | |
3552 } | |
3553 } | |
3554 | |
3555 // Used to convert frequent JVM_Yield() to nops | |
3556 bool os::dont_yield() { | |
3557 return DontYieldALot; | |
3558 } | |
3559 | |
3560 void os::yield() { | |
3561 sched_yield(); | |
3562 } | |
3563 | |
3564 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
3565 | |
3566 void os::yield_all(int attempts) { | |
3567 // Yields to all threads, including threads with lower priorities | |
3568 // Threads on Linux are all with same priority. The Solaris style | |
3569 // os::yield_all() with nanosleep(1ms) is not necessary. | |
3570 sched_yield(); | |
3571 } | |
3572 | |
3573 // Called from the tight loops to possibly influence time-sharing heuristics | |
3574 void os::loop_breaker(int attempts) { | |
3575 os::yield_all(attempts); | |
3576 } | |
3577 | |
3578 //////////////////////////////////////////////////////////////////////////////// | |
3579 // thread priority support | |
3580 | |
3581 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
3582 // only supports dynamic priority, static priority must be zero. For real-time | |
3583 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
3584 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
3585 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
3586 // of 5 runs - Sep 2005). | |
3587 // | |
3588 // The following code actually changes the niceness of kernel-thread/LWP. It | |
3589 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
3590 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
3591 // threads. It has always been the case, but could change in the future. For | |
3592 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
3593 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
3594 | |
4854
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3595 int os::java_to_os_priority[CriticalPriority + 1] = { |
0 | 3596 19, // 0 Entry should never be used |
3597 | |
3598 4, // 1 MinPriority | |
3599 3, // 2 | |
3600 2, // 3 | |
3601 | |
3602 1, // 4 | |
3603 0, // 5 NormPriority | |
3604 -1, // 6 | |
3605 | |
3606 -2, // 7 | |
3607 -3, // 8 | |
3608 -4, // 9 NearMaxPriority | |
3609 | |
4854
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3610 -5, // 10 MaxPriority |
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|
3611 |
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|
3612 -5 // 11 CriticalPriority |
0 | 3613 }; |
3614 | |
3615 static int prio_init() { | |
3616 if (ThreadPriorityPolicy == 1) { | |
3617 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
3618 // if effective uid is not root. Perhaps, a more elegant way of doing | |
3619 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
3620 if (geteuid() != 0) { | |
3621 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
3622 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
3623 } | |
3624 ThreadPriorityPolicy = 0; | |
3625 } | |
3626 } | |
4854
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4803
diff
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|
3627 if (UseCriticalJavaThreadPriority) { |
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phh
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diff
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|
3628 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
de268c8a8075
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|
3629 } |
0 | 3630 return 0; |
3631 } | |
3632 | |
3633 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
3634 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
3635 | |
3636 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
3637 return (ret == 0) ? OS_OK : OS_ERR; | |
3638 } | |
3639 | |
3640 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
3641 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
3642 *priority_ptr = java_to_os_priority[NormPriority]; | |
3643 return OS_OK; | |
3644 } | |
3645 | |
3646 errno = 0; | |
3647 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
3648 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
3649 } | |
3650 | |
3651 // Hint to the underlying OS that a task switch would not be good. | |
3652 // Void return because it's a hint and can fail. | |
3653 void os::hint_no_preempt() {} | |
3654 | |
3655 //////////////////////////////////////////////////////////////////////////////// | |
3656 // suspend/resume support | |
3657 | |
3658 // the low-level signal-based suspend/resume support is a remnant from the | |
3659 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
3660 // within hotspot. Now there is a single use-case for this: | |
3661 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
3662 // that runs in the watcher thread. | |
3663 // The remaining code is greatly simplified from the more general suspension | |
3664 // code that used to be used. | |
3665 // | |
3666 // The protocol is quite simple: | |
3667 // - suspend: | |
3668 // - sends a signal to the target thread | |
3669 // - polls the suspend state of the osthread using a yield loop | |
3670 // - target thread signal handler (SR_handler) sets suspend state | |
3671 // and blocks in sigsuspend until continued | |
3672 // - resume: | |
3673 // - sets target osthread state to continue | |
3674 // - sends signal to end the sigsuspend loop in the SR_handler | |
3675 // | |
3676 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
3677 // | |
3678 | |
3679 static void resume_clear_context(OSThread *osthread) { | |
3680 osthread->set_ucontext(NULL); | |
3681 osthread->set_siginfo(NULL); | |
3682 } | |
3683 | |
3684 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
3685 osthread->set_ucontext(context); | |
3686 osthread->set_siginfo(siginfo); | |
3687 } | |
3688 | |
3689 // | |
3690 // Handler function invoked when a thread's execution is suspended or | |
3691 // resumed. We have to be careful that only async-safe functions are | |
3692 // called here (Note: most pthread functions are not async safe and | |
3693 // should be avoided.) | |
3694 // | |
3695 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
3696 // interface point of view, but sigwait() prevents the signal hander | |
3697 // from being run. libpthread would get very confused by not having | |
3698 // its signal handlers run and prevents sigwait()'s use with the | |
3699 // mutex granting granting signal. | |
3700 // | |
10405 | 3701 // Currently only ever called on the VMThread and JavaThreads (PC sampling) |
0 | 3702 // |
3703 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
3704 // Save and restore errno to avoid confusing native code with EINTR | |
3705 // after sigsuspend. | |
3706 int old_errno = errno; | |
3707 | |
3708 Thread* thread = Thread::current(); | |
3709 OSThread* osthread = thread->osthread(); | |
10405 | 3710 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
3711 | |
3712 os::SuspendResume::State current = osthread->sr.state(); | |
3713 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
0 | 3714 suspend_save_context(osthread, siginfo, context); |
3715 | |
10405 | 3716 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
3717 os::SuspendResume::State state = osthread->sr.suspended(); | |
3718 if (state == os::SuspendResume::SR_SUSPENDED) { | |
3719 sigset_t suspend_set; // signals for sigsuspend() | |
3720 | |
3721 // get current set of blocked signals and unblock resume signal | |
3722 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
3723 sigdelset(&suspend_set, SR_signum); | |
3724 | |
3725 sr_semaphore.signal(); | |
3726 // wait here until we are resumed | |
3727 while (1) { | |
3728 sigsuspend(&suspend_set); | |
3729 | |
3730 os::SuspendResume::State result = osthread->sr.running(); | |
3731 if (result == os::SuspendResume::SR_RUNNING) { | |
3732 sr_semaphore.signal(); | |
3733 break; | |
3734 } | |
3735 } | |
3736 | |
3737 } else if (state == os::SuspendResume::SR_RUNNING) { | |
3738 // request was cancelled, continue | |
3739 } else { | |
3740 ShouldNotReachHere(); | |
3741 } | |
0 | 3742 |
3743 resume_clear_context(osthread); | |
10405 | 3744 } else if (current == os::SuspendResume::SR_RUNNING) { |
3745 // request was cancelled, continue | |
3746 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
3747 // ignore | |
0 | 3748 } else { |
10405 | 3749 // ignore |
0 | 3750 } |
3751 | |
3752 errno = old_errno; | |
3753 } | |
3754 | |
3755 | |
3756 static int SR_initialize() { | |
3757 struct sigaction act; | |
3758 char *s; | |
3759 /* Get signal number to use for suspend/resume */ | |
3760 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
3761 int sig = ::strtol(s, 0, 10); | |
3762 if (sig > 0 || sig < _NSIG) { | |
3763 SR_signum = sig; | |
3764 } | |
3765 } | |
3766 | |
3767 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
3768 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
3769 | |
3770 sigemptyset(&SR_sigset); | |
3771 sigaddset(&SR_sigset, SR_signum); | |
3772 | |
3773 /* Set up signal handler for suspend/resume */ | |
3774 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
3775 act.sa_handler = (void (*)(int)) SR_handler; | |
3776 | |
3777 // SR_signum is blocked by default. | |
3778 // 4528190 - We also need to block pthread restart signal (32 on all | |
3779 // supported Linux platforms). Note that LinuxThreads need to block | |
3780 // this signal for all threads to work properly. So we don't have | |
3781 // to use hard-coded signal number when setting up the mask. | |
3782 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
3783 | |
3784 if (sigaction(SR_signum, &act, 0) == -1) { | |
3785 return -1; | |
3786 } | |
3787 | |
3788 // Save signal flag | |
3789 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
3790 return 0; | |
3791 } | |
3792 | |
10405 | 3793 static int sr_notify(OSThread* osthread) { |
3794 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
3795 assert_status(status == 0, status, "pthread_kill"); | |
3796 return status; | |
3797 } | |
3798 | |
3799 // "Randomly" selected value for how long we want to spin | |
3800 // before bailing out on suspending a thread, also how often | |
3801 // we send a signal to a thread we want to resume | |
3802 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
3803 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
0 | 3804 |
3805 // returns true on success and false on error - really an error is fatal | |
3806 // but this seems the normal response to library errors | |
3807 static bool do_suspend(OSThread* osthread) { | |
10405 | 3808 assert(osthread->sr.is_running(), "thread should be running"); |
3809 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
3810 | |
0 | 3811 // mark as suspended and send signal |
10405 | 3812 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
3813 // failed to switch, state wasn't running? | |
3814 ShouldNotReachHere(); | |
3815 return false; | |
3816 } | |
3817 | |
3818 if (sr_notify(osthread) != 0) { | |
3819 ShouldNotReachHere(); | |
3820 } | |
3821 | |
3822 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
3823 while (true) { | |
3824 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
3825 break; | |
3826 } else { | |
3827 // timeout | |
3828 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
3829 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
3830 return false; | |
3831 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
3832 // make sure that we consume the signal on the semaphore as well | |
3833 sr_semaphore.wait(); | |
3834 break; | |
3835 } else { | |
3836 ShouldNotReachHere(); | |
3837 return false; | |
3838 } | |
0 | 3839 } |
10405 | 3840 } |
3841 | |
3842 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
3843 return true; | |
0 | 3844 } |
3845 | |
3846 static void do_resume(OSThread* osthread) { | |
3847 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 3848 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
3849 | |
3850 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
3851 // failed to switch to WAKEUP_REQUEST | |
3852 ShouldNotReachHere(); | |
3853 return; | |
3854 } | |
3855 | |
3856 while (true) { | |
3857 if (sr_notify(osthread) == 0) { | |
3858 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
3859 if (osthread->sr.is_running()) { | |
3860 return; | |
3861 } | |
3862 } | |
3863 } else { | |
3864 ShouldNotReachHere(); | |
0 | 3865 } |
3866 } | |
10405 | 3867 |
3868 guarantee(osthread->sr.is_running(), "Must be running!"); | |
0 | 3869 } |
3870 | |
3871 //////////////////////////////////////////////////////////////////////////////// | |
3872 // interrupt support | |
3873 | |
3874 void os::interrupt(Thread* thread) { | |
3875 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3876 "possibility of dangling Thread pointer"); | |
3877 | |
3878 OSThread* osthread = thread->osthread(); | |
3879 | |
3880 if (!osthread->interrupted()) { | |
3881 osthread->set_interrupted(true); | |
3882 // More than one thread can get here with the same value of osthread, | |
3883 // resulting in multiple notifications. We do, however, want the store | |
3884 // to interrupted() to be visible to other threads before we execute unpark(). | |
3885 OrderAccess::fence(); | |
3886 ParkEvent * const slp = thread->_SleepEvent ; | |
3887 if (slp != NULL) slp->unpark() ; | |
3888 } | |
3889 | |
3890 // For JSR166. Unpark even if interrupt status already was set | |
3891 if (thread->is_Java_thread()) | |
3892 ((JavaThread*)thread)->parker()->unpark(); | |
3893 | |
3894 ParkEvent * ev = thread->_ParkEvent ; | |
3895 if (ev != NULL) ev->unpark() ; | |
3896 | |
3897 } | |
3898 | |
3899 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3900 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3901 "possibility of dangling Thread pointer"); | |
3902 | |
3903 OSThread* osthread = thread->osthread(); | |
3904 | |
3905 bool interrupted = osthread->interrupted(); | |
3906 | |
3907 if (interrupted && clear_interrupted) { | |
3908 osthread->set_interrupted(false); | |
3909 // consider thread->_SleepEvent->reset() ... optional optimization | |
3910 } | |
3911 | |
3912 return interrupted; | |
3913 } | |
3914 | |
3915 /////////////////////////////////////////////////////////////////////////////////// | |
3916 // signal handling (except suspend/resume) | |
3917 | |
3918 // This routine may be used by user applications as a "hook" to catch signals. | |
3919 // The user-defined signal handler must pass unrecognized signals to this | |
3920 // routine, and if it returns true (non-zero), then the signal handler must | |
3921 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3922 // routine will never retun false (zero), but instead will execute a VM panic | |
3923 // routine kill the process. | |
3924 // | |
3925 // If this routine returns false, it is OK to call it again. This allows | |
3926 // the user-defined signal handler to perform checks either before or after | |
3927 // the VM performs its own checks. Naturally, the user code would be making | |
3928 // a serious error if it tried to handle an exception (such as a null check | |
3929 // or breakpoint) that the VM was generating for its own correct operation. | |
3930 // | |
3931 // This routine may recognize any of the following kinds of signals: | |
3932 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3933 // It should be consulted by handlers for any of those signals. | |
3934 // | |
3935 // The caller of this routine must pass in the three arguments supplied | |
3936 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3937 // field of the structure passed to sigaction(). This routine assumes that | |
3938 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3939 // | |
3940 // Note that the VM will print warnings if it detects conflicting signal | |
3941 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3942 // | |
2191 | 3943 extern "C" JNIEXPORT int |
0 | 3944 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
3945 void* ucontext, int abort_if_unrecognized); | |
3946 | |
3947 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3948 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 3949 int orig_errno = errno; // Preserve errno value over signal handler. |
0 | 3950 JVM_handle_linux_signal(sig, info, uc, true); |
8067 | 3951 errno = orig_errno; |
0 | 3952 } |
3953 | |
3954 | |
3955 // This boolean allows users to forward their own non-matching signals | |
3956 // to JVM_handle_linux_signal, harmlessly. | |
3957 bool os::Linux::signal_handlers_are_installed = false; | |
3958 | |
3959 // For signal-chaining | |
3960 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
3961 unsigned int os::Linux::sigs = 0; | |
3962 bool os::Linux::libjsig_is_loaded = false; | |
3963 typedef struct sigaction *(*get_signal_t)(int); | |
3964 get_signal_t os::Linux::get_signal_action = NULL; | |
3965 | |
3966 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
3967 struct sigaction *actp = NULL; | |
3968 | |
3969 if (libjsig_is_loaded) { | |
3970 // Retrieve the old signal handler from libjsig | |
3971 actp = (*get_signal_action)(sig); | |
3972 } | |
3973 if (actp == NULL) { | |
3974 // Retrieve the preinstalled signal handler from jvm | |
3975 actp = get_preinstalled_handler(sig); | |
3976 } | |
3977 | |
3978 return actp; | |
3979 } | |
3980 | |
3981 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3982 siginfo_t *siginfo, void *context) { | |
3983 // Call the old signal handler | |
3984 if (actp->sa_handler == SIG_DFL) { | |
3985 // It's more reasonable to let jvm treat it as an unexpected exception | |
3986 // instead of taking the default action. | |
3987 return false; | |
3988 } else if (actp->sa_handler != SIG_IGN) { | |
3989 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
3990 // automaticlly block the signal | |
3991 sigaddset(&(actp->sa_mask), sig); | |
3992 } | |
3993 | |
3994 sa_handler_t hand; | |
3995 sa_sigaction_t sa; | |
3996 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
3997 // retrieve the chained handler | |
3998 if (siginfo_flag_set) { | |
3999 sa = actp->sa_sigaction; | |
4000 } else { | |
4001 hand = actp->sa_handler; | |
4002 } | |
4003 | |
4004 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
4005 actp->sa_handler = SIG_DFL; | |
4006 } | |
4007 | |
4008 // try to honor the signal mask | |
4009 sigset_t oset; | |
4010 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
4011 | |
4012 // call into the chained handler | |
4013 if (siginfo_flag_set) { | |
4014 (*sa)(sig, siginfo, context); | |
4015 } else { | |
4016 (*hand)(sig); | |
4017 } | |
4018 | |
4019 // restore the signal mask | |
4020 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
4021 } | |
4022 // Tell jvm's signal handler the signal is taken care of. | |
4023 return true; | |
4024 } | |
4025 | |
4026 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
4027 bool chained = false; | |
4028 // signal-chaining | |
4029 if (UseSignalChaining) { | |
4030 struct sigaction *actp = get_chained_signal_action(sig); | |
4031 if (actp != NULL) { | |
4032 chained = call_chained_handler(actp, sig, siginfo, context); | |
4033 } | |
4034 } | |
4035 return chained; | |
4036 } | |
4037 | |
4038 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
4039 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
4040 return &sigact[sig]; | |
4041 } | |
4042 return NULL; | |
4043 } | |
4044 | |
4045 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
4046 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4047 sigact[sig] = oldAct; | |
4048 sigs |= (unsigned int)1 << sig; | |
4049 } | |
4050 | |
4051 // for diagnostic | |
4052 int os::Linux::sigflags[MAXSIGNUM]; | |
4053 | |
4054 int os::Linux::get_our_sigflags(int sig) { | |
4055 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4056 return sigflags[sig]; | |
4057 } | |
4058 | |
4059 void os::Linux::set_our_sigflags(int sig, int flags) { | |
4060 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4061 sigflags[sig] = flags; | |
4062 } | |
4063 | |
4064 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
4065 // Check for overwrite. | |
4066 struct sigaction oldAct; | |
4067 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
4068 | |
4069 void* oldhand = oldAct.sa_sigaction | |
4070 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4071 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4072 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
4073 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
4074 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
4075 if (AllowUserSignalHandlers || !set_installed) { | |
4076 // Do not overwrite; user takes responsibility to forward to us. | |
4077 return; | |
4078 } else if (UseSignalChaining) { | |
4079 // save the old handler in jvm | |
4080 save_preinstalled_handler(sig, oldAct); | |
4081 // libjsig also interposes the sigaction() call below and saves the | |
4082 // old sigaction on it own. | |
4083 } else { | |
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4084 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
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4085 "%#lx for signal %d.", (long)oldhand, sig)); |
0 | 4086 } |
4087 } | |
4088 | |
4089 struct sigaction sigAct; | |
4090 sigfillset(&(sigAct.sa_mask)); | |
4091 sigAct.sa_handler = SIG_DFL; | |
4092 if (!set_installed) { | |
4093 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4094 } else { | |
4095 sigAct.sa_sigaction = signalHandler; | |
4096 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4097 } | |
4098 // Save flags, which are set by ours | |
4099 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4100 sigflags[sig] = sigAct.sa_flags; | |
4101 | |
4102 int ret = sigaction(sig, &sigAct, &oldAct); | |
4103 assert(ret == 0, "check"); | |
4104 | |
4105 void* oldhand2 = oldAct.sa_sigaction | |
4106 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4107 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4108 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
4109 } | |
4110 | |
4111 // install signal handlers for signals that HotSpot needs to | |
4112 // handle in order to support Java-level exception handling. | |
4113 | |
4114 void os::Linux::install_signal_handlers() { | |
4115 if (!signal_handlers_are_installed) { | |
4116 signal_handlers_are_installed = true; | |
4117 | |
4118 // signal-chaining | |
4119 typedef void (*signal_setting_t)(); | |
4120 signal_setting_t begin_signal_setting = NULL; | |
4121 signal_setting_t end_signal_setting = NULL; | |
4122 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4123 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
4124 if (begin_signal_setting != NULL) { | |
4125 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4126 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
4127 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
4128 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
4129 libjsig_is_loaded = true; | |
4130 assert(UseSignalChaining, "should enable signal-chaining"); | |
4131 } | |
4132 if (libjsig_is_loaded) { | |
4133 // Tell libjsig jvm is setting signal handlers | |
4134 (*begin_signal_setting)(); | |
4135 } | |
4136 | |
4137 set_signal_handler(SIGSEGV, true); | |
4138 set_signal_handler(SIGPIPE, true); | |
4139 set_signal_handler(SIGBUS, true); | |
4140 set_signal_handler(SIGILL, true); | |
4141 set_signal_handler(SIGFPE, true); | |
4142 set_signal_handler(SIGXFSZ, true); | |
4143 | |
4144 if (libjsig_is_loaded) { | |
4145 // Tell libjsig jvm finishes setting signal handlers | |
4146 (*end_signal_setting)(); | |
4147 } | |
4148 | |
4149 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
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4150 // and if UserSignalHandler is installed all bets are off. |
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4151 // Log that signal checking is off only if -verbose:jni is specified. |
0 | 4152 if (CheckJNICalls) { |
4153 if (libjsig_is_loaded) { | |
3956
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4154 if (PrintJNIResolving) { |
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4155 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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4156 } |
0 | 4157 check_signals = false; |
4158 } | |
4159 if (AllowUserSignalHandlers) { | |
3956
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4160 if (PrintJNIResolving) { |
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4161 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
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4162 } |
0 | 4163 check_signals = false; |
4164 } | |
4165 } | |
4166 } | |
4167 } | |
4168 | |
4169 // This is the fastest way to get thread cpu time on Linux. | |
4170 // Returns cpu time (user+sys) for any thread, not only for current. | |
4171 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
4172 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
4173 // For reference, please, see IEEE Std 1003.1-2004: | |
4174 // http://www.unix.org/single_unix_specification | |
4175 | |
4176 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
4177 struct timespec tp; | |
4178 int rc = os::Linux::clock_gettime(clockid, &tp); | |
4179 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
4180 | |
4712
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4181 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
0 | 4182 } |
4183 | |
4184 ///// | |
4185 // glibc on Linux platform uses non-documented flag | |
4186 // to indicate, that some special sort of signal | |
4187 // trampoline is used. | |
4188 // We will never set this flag, and we should | |
4189 // ignore this flag in our diagnostic | |
4190 #ifdef SIGNIFICANT_SIGNAL_MASK | |
4191 #undef SIGNIFICANT_SIGNAL_MASK | |
4192 #endif | |
4193 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
4194 | |
4195 static const char* get_signal_handler_name(address handler, | |
4196 char* buf, int buflen) { | |
4197 int offset; | |
4198 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
4199 if (found) { | |
4200 // skip directory names | |
4201 const char *p1, *p2; | |
4202 p1 = buf; | |
4203 size_t len = strlen(os::file_separator()); | |
4204 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
4205 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
4206 } else { | |
4207 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
4208 } | |
4209 return buf; | |
4210 } | |
4211 | |
4212 static void print_signal_handler(outputStream* st, int sig, | |
4213 char* buf, size_t buflen) { | |
4214 struct sigaction sa; | |
4215 | |
4216 sigaction(sig, NULL, &sa); | |
4217 | |
4218 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
4219 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4220 | |
4221 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
4222 | |
4223 address handler = (sa.sa_flags & SA_SIGINFO) | |
4224 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
4225 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
4226 | |
4227 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
4228 st->print("SIG_DFL"); | |
4229 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
4230 st->print("SIG_IGN"); | |
4231 } else { | |
4232 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
4233 } | |
4234 | |
14410 | 4235 st->print(", sa_mask[0]="); |
4236 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
0 | 4237 |
4238 address rh = VMError::get_resetted_sighandler(sig); | |
4239 // May be, handler was resetted by VMError? | |
4240 if(rh != NULL) { | |
4241 handler = rh; | |
4242 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
4243 } | |
4244 | |
14410 | 4245 st->print(", sa_flags="); |
4246 os::Posix::print_sa_flags(st, sa.sa_flags); | |
0 | 4247 |
4248 // Check: is it our handler? | |
4249 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
4250 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
4251 // It is our signal handler | |
4252 // check for flags, reset system-used one! | |
4253 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4254 st->print( | |
4255 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
4256 os::Linux::get_our_sigflags(sig)); | |
4257 } | |
4258 } | |
4259 st->cr(); | |
4260 } | |
4261 | |
4262 | |
4263 #define DO_SIGNAL_CHECK(sig) \ | |
4264 if (!sigismember(&check_signal_done, sig)) \ | |
4265 os::Linux::check_signal_handler(sig) | |
4266 | |
4267 // This method is a periodic task to check for misbehaving JNI applications | |
4268 // under CheckJNI, we can add any periodic checks here | |
4269 | |
4270 void os::run_periodic_checks() { | |
4271 | |
4272 if (check_signals == false) return; | |
4273 | |
4274 // SEGV and BUS if overridden could potentially prevent | |
4275 // generation of hs*.log in the event of a crash, debugging | |
4276 // such a case can be very challenging, so we absolutely | |
4277 // check the following for a good measure: | |
4278 DO_SIGNAL_CHECK(SIGSEGV); | |
4279 DO_SIGNAL_CHECK(SIGILL); | |
4280 DO_SIGNAL_CHECK(SIGFPE); | |
4281 DO_SIGNAL_CHECK(SIGBUS); | |
4282 DO_SIGNAL_CHECK(SIGPIPE); | |
4283 DO_SIGNAL_CHECK(SIGXFSZ); | |
4284 | |
4285 | |
4286 // ReduceSignalUsage allows the user to override these handlers | |
4287 // see comments at the very top and jvm_solaris.h | |
4288 if (!ReduceSignalUsage) { | |
4289 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
4290 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
4291 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
4292 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
4293 } | |
4294 | |
4295 DO_SIGNAL_CHECK(SR_signum); | |
4296 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
4297 } | |
4298 | |
4299 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
4300 | |
4301 static os_sigaction_t os_sigaction = NULL; | |
4302 | |
4303 void os::Linux::check_signal_handler(int sig) { | |
4304 char buf[O_BUFLEN]; | |
4305 address jvmHandler = NULL; | |
4306 | |
4307 | |
4308 struct sigaction act; | |
4309 if (os_sigaction == NULL) { | |
4310 // only trust the default sigaction, in case it has been interposed | |
4311 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
4312 if (os_sigaction == NULL) return; | |
4313 } | |
4314 | |
4315 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
4316 | |
4317 | |
4318 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4319 | |
4320 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
4321 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
4322 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
4323 | |
4324 | |
4325 switch(sig) { | |
4326 case SIGSEGV: | |
4327 case SIGBUS: | |
4328 case SIGFPE: | |
4329 case SIGPIPE: | |
4330 case SIGILL: | |
4331 case SIGXFSZ: | |
4332 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
4333 break; | |
4334 | |
4335 case SHUTDOWN1_SIGNAL: | |
4336 case SHUTDOWN2_SIGNAL: | |
4337 case SHUTDOWN3_SIGNAL: | |
4338 case BREAK_SIGNAL: | |
4339 jvmHandler = (address)user_handler(); | |
4340 break; | |
4341 | |
4342 case INTERRUPT_SIGNAL: | |
4343 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
4344 break; | |
4345 | |
4346 default: | |
4347 if (sig == SR_signum) { | |
4348 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
4349 } else { | |
4350 return; | |
4351 } | |
4352 break; | |
4353 } | |
4354 | |
4355 if (thisHandler != jvmHandler) { | |
4356 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
4357 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
4358 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
4359 // No need to check this sig any longer | |
4360 sigaddset(&check_signal_done, sig); | |
4361 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4362 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
4363 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
4364 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
4365 // No need to check this sig any longer | |
4366 sigaddset(&check_signal_done, sig); | |
4367 } | |
4368 | |
4369 // Dump all the signal | |
4370 if (sigismember(&check_signal_done, sig)) { | |
4371 print_signal_handlers(tty, buf, O_BUFLEN); | |
4372 } | |
4373 } | |
4374 | |
4375 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
4376 | |
4377 extern bool signal_name(int signo, char* buf, size_t len); | |
4378 | |
4379 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
4380 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
4381 // signal | |
4382 if (!signal_name(exception_code, buf, size)) { | |
4383 jio_snprintf(buf, size, "SIG%d", exception_code); | |
4384 } | |
4385 return buf; | |
4386 } else { | |
4387 return NULL; | |
4388 } | |
4389 } | |
4390 | |
4391 // this is called _before_ the most of global arguments have been parsed | |
4392 void os::init(void) { | |
4393 char dummy; /* used to get a guess on initial stack address */ | |
4394 // first_hrtime = gethrtime(); | |
4395 | |
4396 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
4397 // is different than the pid of the java launcher thread. | |
4398 // So, on Linux, the launcher thread pid is passed to the VM | |
4399 // via the sun.java.launcher.pid property. | |
4400 // Use this property instead of getpid() if it was correctly passed. | |
4401 // See bug 6351349. | |
4402 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
4403 | |
4404 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
4405 | |
4406 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
4407 | |
4408 init_random(1234567); | |
4409 | |
4410 ThreadCritical::initialize(); | |
4411 | |
4412 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
4413 if (Linux::page_size() == -1) { | |
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4414 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
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4415 strerror(errno))); |
0 | 4416 } |
4417 init_page_sizes((size_t) Linux::page_size()); | |
4418 | |
4419 Linux::initialize_system_info(); | |
4420 | |
4421 // main_thread points to the aboriginal thread | |
4422 Linux::_main_thread = pthread_self(); | |
4423 | |
4424 Linux::clock_init(); | |
4425 initial_time_count = os::elapsed_counter(); | |
242 | 4426 pthread_mutex_init(&dl_mutex, NULL); |
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4427 |
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4428 // If the pagesize of the VM is greater than 8K determine the appropriate |
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4429 // number of initial guard pages. The user can change this with the |
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4430 // command line arguments, if needed. |
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4431 if (vm_page_size() > (int)Linux::vm_default_page_size()) { |
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4432 StackYellowPages = 1; |
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4433 StackRedPages = 1; |
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4434 StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size(); |
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4435 } |
0 | 4436 } |
4437 | |
4438 // To install functions for atexit system call | |
4439 extern "C" { | |
4440 static void perfMemory_exit_helper() { | |
4441 perfMemory_exit(); | |
4442 } | |
4443 } | |
4444 | |
4445 // this is called _after_ the global arguments have been parsed | |
4446 jint os::init_2(void) | |
4447 { | |
4448 Linux::fast_thread_clock_init(); | |
4449 | |
4450 // Allocate a single page and mark it as readable for safepoint polling | |
4451 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4452 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
4453 | |
4454 os::set_polling_page( polling_page ); | |
4455 | |
4456 #ifndef PRODUCT | |
4457 if(Verbose && PrintMiscellaneous) | |
4458 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
4459 #endif | |
4460 | |
4461 if (!UseMembar) { | |
4462 address mem_serialize_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
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10405
diff
changeset
|
4463 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
0 | 4464 os::set_memory_serialize_page( mem_serialize_page ); |
4465 | |
4466 #ifndef PRODUCT | |
4467 if(Verbose && PrintMiscellaneous) | |
4468 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
4469 #endif | |
4470 } | |
4471 | |
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
4472 os::large_page_init(); |
0 | 4473 |
4474 // initialize suspend/resume support - must do this before signal_sets_init() | |
4475 if (SR_initialize() != 0) { | |
4476 perror("SR_initialize failed"); | |
4477 return JNI_ERR; | |
4478 } | |
4479 | |
4480 Linux::signal_sets_init(); | |
4481 Linux::install_signal_handlers(); | |
4482 | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4483 // Check minimum allowable stack size for thread creation and to initialize |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4484 // the java system classes, including StackOverflowError - depends on page |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4485 // size. Add a page for compiler2 recursion in main thread. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4486 // Add in 2*BytesPerWord times page size to account for VM stack during |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4487 // class initialization depending on 32 or 64 bit VM. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4488 os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed, |
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4489 (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Linux::page_size() + |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4490 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::vm_default_page_size()); |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4491 |
0 | 4492 size_t threadStackSizeInBytes = ThreadStackSize * K; |
4493 if (threadStackSizeInBytes != 0 && | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4494 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
0 | 4495 tty->print_cr("\nThe stack size specified is too small, " |
4496 "Specify at least %dk", | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4497 os::Linux::min_stack_allowed/ K); |
0 | 4498 return JNI_ERR; |
4499 } | |
4500 | |
4501 // Make the stack size a multiple of the page size so that | |
4502 // the yellow/red zones can be guarded. | |
4503 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
4504 vm_page_size())); | |
4505 | |
4506 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
4507 | |
4508 Linux::libpthread_init(); | |
4509 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
4510 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
4511 Linux::glibc_version(), Linux::libpthread_version(), | |
4512 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
4513 } | |
4514 | |
141 | 4515 if (UseNUMA) { |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4516 if (!Linux::libnuma_init()) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4517 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4518 } else { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4519 if ((Linux::numa_max_node() < 1)) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4520 // There's only one node(they start from 0), disable NUMA. |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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diff
changeset
|
4521 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
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diff
changeset
|
4522 } |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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diff
changeset
|
4523 } |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4524 // With SHM large pages we cannot uncommit a page, so there's not way |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4525 // we can make the adaptive lgrp chunk resizing work. If the user specified |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4526 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4527 // disable adaptive resizing. |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4528 if (UseNUMA && UseLargePages && UseSHM) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4529 if (!FLAG_IS_DEFAULT(UseNUMA)) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4530 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4531 UseLargePages = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4532 } else { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4533 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing"); |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4534 UseAdaptiveSizePolicy = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4535 UseAdaptiveNUMAChunkSizing = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4536 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4537 } else { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4538 UseNUMA = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4539 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4540 } |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4541 if (!UseNUMA && ForceNUMA) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4542 UseNUMA = true; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4543 } |
141 | 4544 } |
4545 | |
0 | 4546 if (MaxFDLimit) { |
4547 // set the number of file descriptors to max. print out error | |
4548 // if getrlimit/setrlimit fails but continue regardless. | |
4549 struct rlimit nbr_files; | |
4550 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
4551 if (status != 0) { | |
4552 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4553 perror("os::init_2 getrlimit failed"); | |
4554 } else { | |
4555 nbr_files.rlim_cur = nbr_files.rlim_max; | |
4556 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
4557 if (status != 0) { | |
4558 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4559 perror("os::init_2 setrlimit failed"); | |
4560 } | |
4561 } | |
4562 } | |
4563 | |
4564 // Initialize lock used to serialize thread creation (see os::create_thread) | |
4565 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
4566 | |
4567 // at-exit methods are called in the reverse order of their registration. | |
4568 // atexit functions are called on return from main or as a result of a | |
4569 // call to exit(3C). There can be only 32 of these functions registered | |
4570 // and atexit() does not set errno. | |
4571 | |
4572 if (PerfAllowAtExitRegistration) { | |
4573 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
4574 // atexit functions can be delayed until process exit time, which | |
4575 // can be problematic for embedded VM situations. Embedded VMs should | |
4576 // call DestroyJavaVM() to assure that VM resources are released. | |
4577 | |
4578 // note: perfMemory_exit_helper atexit function may be removed in | |
4579 // the future if the appropriate cleanup code can be added to the | |
4580 // VM_Exit VMOperation's doit method. | |
4581 if (atexit(perfMemory_exit_helper) != 0) { | |
14391 | 4582 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); |
0 | 4583 } |
4584 } | |
4585 | |
4586 // initialize thread priority policy | |
4587 prio_init(); | |
4588 | |
4589 return JNI_OK; | |
4590 } | |
4591 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4592 // this is called at the end of vm_initialization |
14391 | 4593 void os::init_3(void) { |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4594 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4595 // Start the MemNotifyThread |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4596 if (LowMemoryProtection) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4597 MemNotifyThread::start(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4598 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4599 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4600 #endif |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4601 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4602 |
0 | 4603 // Mark the polling page as unreadable |
4604 void os::make_polling_page_unreadable(void) { | |
4605 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
4606 fatal("Could not disable polling page"); | |
4607 }; | |
4608 | |
4609 // Mark the polling page as readable | |
4610 void os::make_polling_page_readable(void) { | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4611 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
0 | 4612 fatal("Could not enable polling page"); |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4613 } |
0 | 4614 }; |
4615 | |
4616 int os::active_processor_count() { | |
4617 // Linux doesn't yet have a (official) notion of processor sets, | |
4618 // so just return the number of online processors. | |
4619 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
4620 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
4621 return online_cpus; | |
4622 } | |
4623 | |
4006 | 4624 void os::set_native_thread_name(const char *name) { |
4625 // Not yet implemented. | |
4626 return; | |
4627 } | |
4628 | |
0 | 4629 bool os::distribute_processes(uint length, uint* distribution) { |
4630 // Not yet implemented. | |
4631 return false; | |
4632 } | |
4633 | |
4634 bool os::bind_to_processor(uint processor_id) { | |
4635 // Not yet implemented. | |
4636 return false; | |
4637 } | |
4638 | |
4639 /// | |
4640 | |
10405 | 4641 void os::SuspendedThreadTask::internal_do_task() { |
4642 if (do_suspend(_thread->osthread())) { | |
4643 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
4644 do_task(context); | |
4645 do_resume(_thread->osthread()); | |
4646 } | |
4647 } | |
4648 | |
4649 class PcFetcher : public os::SuspendedThreadTask { | |
4650 public: | |
4651 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
4652 ExtendedPC result(); | |
4653 protected: | |
4654 void do_task(const os::SuspendedThreadTaskContext& context); | |
4655 private: | |
4656 ExtendedPC _epc; | |
4657 }; | |
4658 | |
4659 ExtendedPC PcFetcher::result() { | |
4660 guarantee(is_done(), "task is not done yet."); | |
4661 return _epc; | |
4662 } | |
4663 | |
4664 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
4665 Thread* thread = context.thread(); | |
4666 OSThread* osthread = thread->osthread(); | |
4667 if (osthread->ucontext() != NULL) { | |
4668 _epc = os::Linux::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
4669 } else { | |
4670 // NULL context is unexpected, double-check this is the VMThread | |
4671 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
4672 } | |
4673 } | |
4674 | |
0 | 4675 // Suspends the target using the signal mechanism and then grabs the PC before |
4676 // resuming the target. Used by the flat-profiler only | |
4677 ExtendedPC os::get_thread_pc(Thread* thread) { | |
4678 // Make sure that it is called by the watcher for the VMThread | |
4679 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
4680 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
4681 | |
10405 | 4682 PcFetcher fetcher(thread); |
4683 fetcher.run(); | |
4684 return fetcher.result(); | |
0 | 4685 } |
4686 | |
4687 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
4688 { | |
4689 if (is_NPTL()) { | |
4690 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4691 } else { | |
4692 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
4693 // word back to default 64bit precision if condvar is signaled. Java | |
4694 // wants 53bit precision. Save and restore current value. | |
4695 int fpu = get_fpu_control_word(); | |
4696 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4697 set_fpu_control_word(fpu); | |
4698 return status; | |
4699 } | |
4700 } | |
4701 | |
4702 //////////////////////////////////////////////////////////////////////////////// | |
4703 // debug support | |
4704 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4705 bool os::find(address addr, outputStream* st) { |
0 | 4706 Dl_info dlinfo; |
4707 memset(&dlinfo, 0, sizeof(dlinfo)); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4708 if (dladdr(addr, &dlinfo) != 0) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4709 st->print(PTR_FORMAT ": ", addr); |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4710 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4711 st->print("%s+%#x", dlinfo.dli_sname, |
0 | 4712 addr - (intptr_t)dlinfo.dli_saddr); |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4713 } else if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4714 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
0 | 4715 } else { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4716 st->print("<absolute address>"); |
0 | 4717 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4718 if (dlinfo.dli_fname != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4719 st->print(" in %s", dlinfo.dli_fname); |
0 | 4720 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4721 if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4722 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
0 | 4723 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4724 st->cr(); |
0 | 4725 |
4726 if (Verbose) { | |
4727 // decode some bytes around the PC | |
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
4728 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
4729 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
0 | 4730 address lowest = (address) dlinfo.dli_sname; |
4731 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
4732 if (begin < lowest) begin = lowest; | |
4733 Dl_info dlinfo2; | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4734 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
0 | 4735 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
4736 end = (address) dlinfo2.dli_saddr; | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4737 Disassembler::decode(begin, end, st); |
0 | 4738 } |
4739 return true; | |
4740 } | |
4741 return false; | |
4742 } | |
4743 | |
4744 //////////////////////////////////////////////////////////////////////////////// | |
4745 // misc | |
4746 | |
4747 // This does not do anything on Linux. This is basically a hook for being | |
4748 // able to use structured exception handling (thread-local exception filters) | |
4749 // on, e.g., Win32. | |
4750 void | |
4751 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
4752 JavaCallArguments* args, Thread* thread) { | |
4753 f(value, method, args, thread); | |
4754 } | |
4755 | |
4756 void os::print_statistics() { | |
4757 } | |
4758 | |
4759 int os::message_box(const char* title, const char* message) { | |
4760 int i; | |
4761 fdStream err(defaultStream::error_fd()); | |
4762 for (i = 0; i < 78; i++) err.print_raw("="); | |
4763 err.cr(); | |
4764 err.print_raw_cr(title); | |
4765 for (i = 0; i < 78; i++) err.print_raw("-"); | |
4766 err.cr(); | |
4767 err.print_raw_cr(message); | |
4768 for (i = 0; i < 78; i++) err.print_raw("="); | |
4769 err.cr(); | |
4770 | |
4771 char buf[16]; | |
4772 // Prevent process from exiting upon "read error" without consuming all CPU | |
4773 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
4774 | |
4775 return buf[0] == 'y' || buf[0] == 'Y'; | |
4776 } | |
4777 | |
4778 int os::stat(const char *path, struct stat *sbuf) { | |
4779 char pathbuf[MAX_PATH]; | |
4780 if (strlen(path) > MAX_PATH - 1) { | |
4781 errno = ENAMETOOLONG; | |
4782 return -1; | |
4783 } | |
1980
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4784 os::native_path(strcpy(pathbuf, path)); |
0 | 4785 return ::stat(pathbuf, sbuf); |
4786 } | |
4787 | |
4788 bool os::check_heap(bool force) { | |
4789 return true; | |
4790 } | |
4791 | |
4792 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
4793 return ::vsnprintf(buf, count, format, args); | |
4794 } | |
4795 | |
4796 // Is a (classpath) directory empty? | |
4797 bool os::dir_is_empty(const char* path) { | |
4798 DIR *dir = NULL; | |
4799 struct dirent *ptr; | |
4800 | |
4801 dir = opendir(path); | |
4802 if (dir == NULL) return true; | |
4803 | |
4804 /* Scan the directory */ | |
4805 bool result = true; | |
4806 char buf[sizeof(struct dirent) + MAX_PATH]; | |
4807 while (result && (ptr = ::readdir(dir)) != NULL) { | |
4808 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
4809 result = false; | |
4810 } | |
4811 } | |
4812 closedir(dir); | |
4813 return result; | |
4814 } | |
4815 | |
1980
828eafbd85cc
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|
4816 // This code originates from JDK's sysOpen and open64_w |
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4817 // from src/solaris/hpi/src/system_md.c |
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|
4818 |
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|
4819 #ifndef O_DELETE |
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1972
diff
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|
4820 #define O_DELETE 0x10000 |
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diff
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|
4821 #endif |
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|
4822 |
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|
4823 // Open a file. Unlink the file immediately after open returns |
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|
4824 // if the specified oflag has the O_DELETE flag set. |
828eafbd85cc
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ikrylov
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diff
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|
4825 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
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|
4826 |
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|
4827 int os::open(const char *path, int oflag, int mode) { |
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|
4828 |
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|
4829 if (strlen(path) > MAX_PATH - 1) { |
828eafbd85cc
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diff
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|
4830 errno = ENAMETOOLONG; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
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|
4831 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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parents:
1972
diff
changeset
|
4832 } |
828eafbd85cc
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diff
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|
4833 int fd; |
828eafbd85cc
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|
4834 int o_delete = (oflag & O_DELETE); |
828eafbd85cc
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ikrylov
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diff
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|
4835 oflag = oflag & ~O_DELETE; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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|
4836 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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|
4837 fd = ::open64(path, oflag, mode); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4838 if (fd == -1) return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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parents:
1972
diff
changeset
|
4839 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
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|
4840 //If the open succeeded, the file might still be a directory |
828eafbd85cc
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1972
diff
changeset
|
4841 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
4842 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
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|
4843 int ret = ::fstat64(fd, &buf64); |
828eafbd85cc
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ikrylov
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|
4844 int st_mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
4845 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
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|
4846 if (ret != -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
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|
4847 if ((st_mode & S_IFMT) == S_IFDIR) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4848 errno = EISDIR; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4849 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4850 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4851 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4852 } else { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4853 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4854 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4855 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4856 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4857 |
828eafbd85cc
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parents:
1972
diff
changeset
|
4858 /* |
828eafbd85cc
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parents:
1972
diff
changeset
|
4859 * All file descriptors that are opened in the JVM and not |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
4860 * specifically destined for a subprocess should have the |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
4861 * close-on-exec flag set. If we don't set it, then careless 3rd |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
4862 * party native code might fork and exec without closing all |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
4863 * appropriate file descriptors (e.g. as we do in closeDescriptors in |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
4864 * UNIXProcess.c), and this in turn might: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4865 * |
828eafbd85cc
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1972
diff
changeset
|
4866 * - cause end-of-file to fail to be detected on some file |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
4867 * descriptors, resulting in mysterious hangs, or |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4868 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4869 * - might cause an fopen in the subprocess to fail on a system |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4870 * suffering from bug 1085341. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4871 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4872 * (Yes, the default setting of the close-on-exec flag is a Unix |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4873 * design flaw) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4874 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4875 * See: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4876 * 1085341: 32-bit stdio routines should support file descriptors >255 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4877 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4878 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4879 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4880 #ifdef FD_CLOEXEC |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
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|
4881 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4882 int flags = ::fcntl(fd, F_GETFD); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4883 if (flags != -1) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4884 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4885 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4886 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4887 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4888 if (o_delete != 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4889 ::unlink(path); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4890 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4891 return fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4892 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4893 |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
4894 |
0 | 4895 // create binary file, rewriting existing file if required |
4896 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4897 int oflags = O_WRONLY | O_CREAT; | |
4898 if (!rewrite_existing) { | |
4899 oflags |= O_EXCL; | |
4900 } | |
4901 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
4902 } | |
4903 | |
4904 // return current position of file pointer | |
4905 jlong os::current_file_offset(int fd) { | |
4906 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
4907 } | |
4908 | |
4909 // move file pointer to the specified offset | |
4910 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4911 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
4912 } | |
4913 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4914 // This code originates from JDK's sysAvailable |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
4915 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4916 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4917 int os::available(int fd, jlong *bytes) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4918 jlong cur, end; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4919 int mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4920 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4921 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4922 if (::fstat64(fd, &buf64) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4923 mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4924 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4925 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4926 * XXX: is the following call interruptible? If so, this might |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4927 * need to go through the INTERRUPT_IO() wrapper as for other |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4928 * blocking, interruptible calls in this file. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4929 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4930 int n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4931 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4932 *bytes = n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4933 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4934 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4935 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4936 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4937 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4938 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4939 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4940 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4941 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4942 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4943 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4944 *bytes = end - cur; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4945 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4946 } |
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4947 |
2033
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4948 int os::socket_available(int fd, jint *pbytes) { |
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4949 // Linux doc says EINTR not returned, unlike Solaris |
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4950 int ret = ::ioctl(fd, FIONREAD, pbytes); |
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4951 |
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4952 //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
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4953 // is expected to return 0 on failure and 1 on success to the jdk. |
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4954 return (ret < 0) ? 0 : 1; |
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4955 } |
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4956 |
0 | 4957 // Map a block of memory. |
6197 | 4958 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
0 | 4959 char *addr, size_t bytes, bool read_only, |
4960 bool allow_exec) { | |
4961 int prot; | |
5909 | 4962 int flags = MAP_PRIVATE; |
0 | 4963 |
4964 if (read_only) { | |
4965 prot = PROT_READ; | |
4966 } else { | |
4967 prot = PROT_READ | PROT_WRITE; | |
4968 } | |
4969 | |
4970 if (allow_exec) { | |
4971 prot |= PROT_EXEC; | |
4972 } | |
4973 | |
4974 if (addr != NULL) { | |
4975 flags |= MAP_FIXED; | |
4976 } | |
4977 | |
4978 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
4979 fd, file_offset); | |
4980 if (mapped_address == MAP_FAILED) { | |
4981 return NULL; | |
4982 } | |
4983 return mapped_address; | |
4984 } | |
4985 | |
4986 | |
4987 // Remap a block of memory. | |
6197 | 4988 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
0 | 4989 char *addr, size_t bytes, bool read_only, |
4990 bool allow_exec) { | |
4991 // same as map_memory() on this OS | |
4992 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4993 allow_exec); | |
4994 } | |
4995 | |
4996 | |
4997 // Unmap a block of memory. | |
6197 | 4998 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
0 | 4999 return munmap(addr, bytes) == 0; |
5000 } | |
5001 | |
5002 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
5003 | |
5004 static clockid_t thread_cpu_clockid(Thread* thread) { | |
5005 pthread_t tid = thread->osthread()->pthread_id(); | |
5006 clockid_t clockid; | |
5007 | |
5008 // Get thread clockid | |
5009 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
5010 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
5011 return clockid; | |
5012 } | |
5013 | |
5014 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
5015 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
5016 // of a thread. | |
5017 // | |
5018 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
5019 // the fast estimate available on the platform. | |
5020 | |
5021 jlong os::current_thread_cpu_time() { | |
5022 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5023 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5024 } else { | |
5025 // return user + sys since the cost is the same | |
5026 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
5027 } | |
5028 } | |
5029 | |
5030 jlong os::thread_cpu_time(Thread* thread) { | |
5031 // consistent with what current_thread_cpu_time() returns | |
5032 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5033 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5034 } else { | |
5035 return slow_thread_cpu_time(thread, true /* user + sys */); | |
5036 } | |
5037 } | |
5038 | |
5039 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
5040 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5041 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5042 } else { | |
5043 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
5044 } | |
5045 } | |
5046 | |
5047 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5048 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5049 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5050 } else { | |
5051 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
5052 } | |
5053 } | |
5054 | |
5055 // | |
5056 // -1 on error. | |
5057 // | |
5058 | |
5059 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5060 static bool proc_task_unchecked = true; | |
5061 static const char *proc_stat_path = "/proc/%d/stat"; | |
5062 pid_t tid = thread->osthread()->thread_id(); | |
5063 char *s; | |
5064 char stat[2048]; | |
5065 int statlen; | |
5066 char proc_name[64]; | |
5067 int count; | |
5068 long sys_time, user_time; | |
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5069 char cdummy; |
0 | 5070 int idummy; |
5071 long ldummy; | |
5072 FILE *fp; | |
5073 | |
5074 // The /proc/<tid>/stat aggregates per-process usage on | |
5075 // new Linux kernels 2.6+ where NPTL is supported. | |
5076 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
5077 // See bug 6328462. | |
8099
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5078 // There possibly can be cases where there is no directory |
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5079 // /proc/self/task, so we check its availability. |
0 | 5080 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
5081 // This is executed only once | |
5082 proc_task_unchecked = false; | |
5083 fp = fopen("/proc/self/task", "r"); | |
5084 if (fp != NULL) { | |
5085 proc_stat_path = "/proc/self/task/%d/stat"; | |
5086 fclose(fp); | |
5087 } | |
5088 } | |
5089 | |
5090 sprintf(proc_name, proc_stat_path, tid); | |
5091 fp = fopen(proc_name, "r"); | |
5092 if ( fp == NULL ) return -1; | |
5093 statlen = fread(stat, 1, 2047, fp); | |
5094 stat[statlen] = '\0'; | |
5095 fclose(fp); | |
5096 | |
5097 // Skip pid and the command string. Note that we could be dealing with | |
5098 // weird command names, e.g. user could decide to rename java launcher | |
5099 // to "java 1.4.2 :)", then the stat file would look like | |
5100 // 1234 (java 1.4.2 :)) R ... ... | |
5101 // We don't really need to know the command string, just find the last | |
5102 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
5103 s = strrchr(stat, ')'); | |
5104 if (s == NULL ) return -1; | |
5105 | |
5106 // Skip blank chars | |
5107 do s++; while (isspace(*s)); | |
5108 | |
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5109 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
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5110 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
0 | 5111 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
5112 &user_time, &sys_time); | |
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5113 if ( count != 13 ) return -1; |
0 | 5114 if (user_sys_cpu_time) { |
5115 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
5116 } else { | |
5117 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
5118 } | |
5119 } | |
5120 | |
5121 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5122 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5123 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5124 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5125 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5126 } | |
5127 | |
5128 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5129 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5130 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5131 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5132 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5133 } | |
5134 | |
5135 bool os::is_thread_cpu_time_supported() { | |
5136 return true; | |
5137 } | |
5138 | |
5139 // System loadavg support. Returns -1 if load average cannot be obtained. | |
5140 // Linux doesn't yet have a (official) notion of processor sets, | |
5141 // so just return the system wide load average. | |
5142 int os::loadavg(double loadavg[], int nelem) { | |
5143 return ::getloadavg(loadavg, nelem); | |
5144 } | |
5145 | |
5146 void os::pause() { | |
5147 char filename[MAX_PATH]; | |
5148 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
5149 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
5150 } else { | |
5151 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
5152 } | |
5153 | |
5154 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
5155 if (fd != -1) { | |
5156 struct stat buf; | |
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5157 ::close(fd); |
0 | 5158 while (::stat(filename, &buf) == 0) { |
5159 (void)::poll(NULL, 0, 100); | |
5160 } | |
5161 } else { | |
5162 jio_fprintf(stderr, | |
5163 "Could not open pause file '%s', continuing immediately.\n", filename); | |
5164 } | |
5165 } | |
5166 | |
5167 | |
5168 // Refer to the comments in os_solaris.cpp park-unpark. | |
5169 // | |
5170 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
5171 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
5172 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
5173 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
5174 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
5175 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
5176 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
5177 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
5178 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
5179 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
5180 // of libpthread avoids the problem, but isn't practical. | |
5181 // | |
5182 // Possible remedies: | |
5183 // | |
5184 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
5185 // This is palliative and probabilistic, however. If the thread is preempted | |
5186 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
5187 // than the minimum period may have passed, and the abstime may be stale (in the | |
5188 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
5189 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
5190 // | |
5191 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
5192 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
5193 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
5194 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
5195 // thread. | |
5196 // | |
5197 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
5198 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
5199 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
5200 // This also works well. In fact it avoids kernel-level scalability impediments | |
5201 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
5202 // timers in a graceful fashion. | |
5203 // | |
5204 // 4. When the abstime value is in the past it appears that control returns | |
5205 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
5206 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
5207 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
5208 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
5209 // It may be possible to avoid reinitialization by checking the return | |
5210 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
5211 // condvar we must establish the invariant that cond_signal() is only called | |
5212 // within critical sections protected by the adjunct mutex. This prevents | |
5213 // cond_signal() from "seeing" a condvar that's in the midst of being | |
5214 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
5215 // desirable signal-after-unlock optimization that avoids futile context switching. | |
5216 // | |
5217 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
5218 // structure when a condvar is used or initialized. cond_destroy() would | |
5219 // release the helper structure. Our reinitialize-after-timedwait fix | |
5220 // put excessive stress on malloc/free and locks protecting the c-heap. | |
5221 // | |
5222 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
5223 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
5224 // and only enabling the work-around for vulnerable environments. | |
5225 | |
5226 // utility to compute the abstime argument to timedwait: | |
5227 // millis is the relative timeout time | |
5228 // abstime will be the absolute timeout time | |
5229 // TODO: replace compute_abstime() with unpackTime() | |
5230 | |
5231 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
5232 if (millis < 0) millis = 0; | |
5233 struct timeval now; | |
5234 int status = gettimeofday(&now, NULL); | |
5235 assert(status == 0, "gettimeofday"); | |
5236 jlong seconds = millis / 1000; | |
5237 millis %= 1000; | |
5238 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
5239 seconds = 50000000; | |
5240 } | |
5241 abstime->tv_sec = now.tv_sec + seconds; | |
5242 long usec = now.tv_usec + millis * 1000; | |
5243 if (usec >= 1000000) { | |
5244 abstime->tv_sec += 1; | |
5245 usec -= 1000000; | |
5246 } | |
5247 abstime->tv_nsec = usec * 1000; | |
5248 return abstime; | |
5249 } | |
5250 | |
5251 | |
5252 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
5253 // Conceptually TryPark() should be equivalent to park(0). | |
5254 | |
5255 int os::PlatformEvent::TryPark() { | |
5256 for (;;) { | |
5257 const int v = _Event ; | |
5258 guarantee ((v == 0) || (v == 1), "invariant") ; | |
5259 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
5260 } | |
5261 } | |
5262 | |
5263 void os::PlatformEvent::park() { // AKA "down()" | |
5264 // Invariant: Only the thread associated with the Event/PlatformEvent | |
5265 // may call park(). | |
5266 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
5267 int v ; | |
5268 for (;;) { | |
5269 v = _Event ; | |
5270 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5271 } | |
5272 guarantee (v >= 0, "invariant") ; | |
5273 if (v == 0) { | |
5274 // Do this the hard way by blocking ... | |
5275 int status = pthread_mutex_lock(_mutex); | |
5276 assert_status(status == 0, status, "mutex_lock"); | |
5277 guarantee (_nParked == 0, "invariant") ; | |
5278 ++ _nParked ; | |
5279 while (_Event < 0) { | |
5280 status = pthread_cond_wait(_cond, _mutex); | |
5281 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
5282 // Treat this the same as if the wait was interrupted | |
5283 if (status == ETIME) { status = EINTR; } | |
5284 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
5285 } | |
5286 -- _nParked ; | |
5287 | |
5288 _Event = 0 ; | |
5289 status = pthread_mutex_unlock(_mutex); | |
5290 assert_status(status == 0, status, "mutex_unlock"); | |
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5291 // Paranoia to ensure our locked and lock-free paths interact |
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5292 // correctly with each other. |
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5293 OrderAccess::fence(); |
0 | 5294 } |
5295 guarantee (_Event >= 0, "invariant") ; | |
5296 } | |
5297 | |
5298 int os::PlatformEvent::park(jlong millis) { | |
5299 guarantee (_nParked == 0, "invariant") ; | |
5300 | |
5301 int v ; | |
5302 for (;;) { | |
5303 v = _Event ; | |
5304 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5305 } | |
5306 guarantee (v >= 0, "invariant") ; | |
5307 if (v != 0) return OS_OK ; | |
5308 | |
5309 // We do this the hard way, by blocking the thread. | |
5310 // Consider enforcing a minimum timeout value. | |
5311 struct timespec abst; | |
5312 compute_abstime(&abst, millis); | |
5313 | |
5314 int ret = OS_TIMEOUT; | |
5315 int status = pthread_mutex_lock(_mutex); | |
5316 assert_status(status == 0, status, "mutex_lock"); | |
5317 guarantee (_nParked == 0, "invariant") ; | |
5318 ++_nParked ; | |
5319 | |
5320 // Object.wait(timo) will return because of | |
5321 // (a) notification | |
5322 // (b) timeout | |
5323 // (c) thread.interrupt | |
5324 // | |
5325 // Thread.interrupt and object.notify{All} both call Event::set. | |
5326 // That is, we treat thread.interrupt as a special case of notification. | |
5327 // The underlying Solaris implementation, cond_timedwait, admits | |
5328 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
5329 // JVM from making those visible to Java code. As such, we must | |
5330 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
5331 // | |
5332 // TODO: properly differentiate simultaneous notify+interrupt. | |
5333 // In that case, we should propagate the notify to another waiter. | |
5334 | |
5335 while (_Event < 0) { | |
5336 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
5337 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5338 pthread_cond_destroy (_cond); | |
5339 pthread_cond_init (_cond, NULL) ; | |
5340 } | |
5341 assert_status(status == 0 || status == EINTR || | |
5342 status == ETIME || status == ETIMEDOUT, | |
5343 status, "cond_timedwait"); | |
5344 if (!FilterSpuriousWakeups) break ; // previous semantics | |
5345 if (status == ETIME || status == ETIMEDOUT) break ; | |
5346 // We consume and ignore EINTR and spurious wakeups. | |
5347 } | |
5348 --_nParked ; | |
5349 if (_Event >= 0) { | |
5350 ret = OS_OK; | |
5351 } | |
5352 _Event = 0 ; | |
5353 status = pthread_mutex_unlock(_mutex); | |
5354 assert_status(status == 0, status, "mutex_unlock"); | |
5355 assert (_nParked == 0, "invariant") ; | |
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5356 // Paranoia to ensure our locked and lock-free paths interact |
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5357 // correctly with each other. |
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5358 OrderAccess::fence(); |
0 | 5359 return ret; |
5360 } | |
5361 | |
5362 void os::PlatformEvent::unpark() { | |
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5363 // Transitions for _Event: |
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5364 // 0 :=> 1 |
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|
5365 // 1 :=> 1 |
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5366 // -1 :=> either 0 or 1; must signal target thread |
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5367 // That is, we can safely transition _Event from -1 to either |
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|
5368 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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|
5369 // unpark() calls. |
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|
5370 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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|
5371 // |
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|
5372 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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|
5373 // that it will take two back-to-back park() calls for the owning |
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|
5374 // thread to block. This has the benefit of forcing a spurious return |
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|
5375 // from the first park() call after an unpark() call which will help |
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|
5376 // shake out uses of park() and unpark() without condition variables. |
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|
5377 |
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|
5378 if (Atomic::xchg(1, &_Event) >= 0) return; |
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|
5379 |
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|
5380 // Wait for the thread associated with the event to vacate |
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|
5381 int status = pthread_mutex_lock(_mutex); |
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|
5382 assert_status(status == 0, status, "mutex_lock"); |
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5383 int AnyWaiters = _nParked; |
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|
5384 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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5385 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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|
5386 AnyWaiters = 0; |
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|
5387 pthread_cond_signal(_cond); |
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|
5388 } |
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|
5389 status = pthread_mutex_unlock(_mutex); |
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|
5390 assert_status(status == 0, status, "mutex_unlock"); |
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|
5391 if (AnyWaiters != 0) { |
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5392 status = pthread_cond_signal(_cond); |
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5393 assert_status(status == 0, status, "cond_signal"); |
0 | 5394 } |
5395 | |
5396 // Note that we signal() _after dropping the lock for "immortal" Events. | |
5397 // This is safe and avoids a common class of futile wakeups. In rare | |
5398 // circumstances this can cause a thread to return prematurely from | |
5399 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
5400 // simply re-test the condition and re-park itself. | |
5401 } | |
5402 | |
5403 | |
5404 // JSR166 | |
5405 // ------------------------------------------------------- | |
5406 | |
5407 /* | |
5408 * The solaris and linux implementations of park/unpark are fairly | |
5409 * conservative for now, but can be improved. They currently use a | |
5410 * mutex/condvar pair, plus a a count. | |
5411 * Park decrements count if > 0, else does a condvar wait. Unpark | |
5412 * sets count to 1 and signals condvar. Only one thread ever waits | |
5413 * on the condvar. Contention seen when trying to park implies that someone | |
5414 * is unparking you, so don't wait. And spurious returns are fine, so there | |
5415 * is no need to track notifications. | |
5416 */ | |
5417 | |
5418 #define MAX_SECS 100000000 | |
5419 /* | |
5420 * This code is common to linux and solaris and will be moved to a | |
5421 * common place in dolphin. | |
5422 * | |
5423 * The passed in time value is either a relative time in nanoseconds | |
5424 * or an absolute time in milliseconds. Either way it has to be unpacked | |
5425 * into suitable seconds and nanoseconds components and stored in the | |
5426 * given timespec structure. | |
5427 * Given time is a 64-bit value and the time_t used in the timespec is only | |
5428 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
5429 * overflow if times way in the future are given. Further on Solaris versions | |
5430 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
5431 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
5432 * As it will be 28 years before "now + 100000000" will overflow we can | |
5433 * ignore overflow and just impose a hard-limit on seconds using the value | |
5434 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
5435 * years from "now". | |
5436 */ | |
5437 | |
5438 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
5439 assert (time > 0, "convertTime"); | |
5440 | |
5441 struct timeval now; | |
5442 int status = gettimeofday(&now, NULL); | |
5443 assert(status == 0, "gettimeofday"); | |
5444 | |
5445 time_t max_secs = now.tv_sec + MAX_SECS; | |
5446 | |
5447 if (isAbsolute) { | |
5448 jlong secs = time / 1000; | |
5449 if (secs > max_secs) { | |
5450 absTime->tv_sec = max_secs; | |
5451 } | |
5452 else { | |
5453 absTime->tv_sec = secs; | |
5454 } | |
5455 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
5456 } | |
5457 else { | |
5458 jlong secs = time / NANOSECS_PER_SEC; | |
5459 if (secs >= MAX_SECS) { | |
5460 absTime->tv_sec = max_secs; | |
5461 absTime->tv_nsec = 0; | |
5462 } | |
5463 else { | |
5464 absTime->tv_sec = now.tv_sec + secs; | |
5465 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
5466 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
5467 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
5468 ++absTime->tv_sec; // note: this must be <= max_secs | |
5469 } | |
5470 } | |
5471 } | |
5472 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
5473 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
5474 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
5475 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
5476 } | |
5477 | |
5478 void Parker::park(bool isAbsolute, jlong time) { | |
7629
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5479 // Ideally we'd do something useful while spinning, such |
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5480 // as calling unpackTime(). |
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|
5481 |
0 | 5482 // Optional fast-path check: |
5483 // Return immediately if a permit is available. | |
7629
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5484 // We depend on Atomic::xchg() having full barrier semantics |
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5485 // since we are doing a lock-free update to _counter. |
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|
5486 if (Atomic::xchg(0, &_counter) > 0) return; |
0 | 5487 |
5488 Thread* thread = Thread::current(); | |
5489 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
5490 JavaThread *jt = (JavaThread *)thread; | |
5491 | |
5492 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
5493 // Check interrupt before trying to wait | |
5494 if (Thread::is_interrupted(thread, false)) { | |
5495 return; | |
5496 } | |
5497 | |
5498 // Next, demultiplex/decode time arguments | |
5499 timespec absTime; | |
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5500 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
0 | 5501 return; |
5502 } | |
5503 if (time > 0) { | |
5504 unpackTime(&absTime, isAbsolute, time); | |
5505 } | |
5506 | |
5507 | |
5508 // Enter safepoint region | |
5509 // Beware of deadlocks such as 6317397. | |
5510 // The per-thread Parker:: mutex is a classic leaf-lock. | |
5511 // In particular a thread must never block on the Threads_lock while | |
5512 // holding the Parker:: mutex. If safepoints are pending both the | |
5513 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
5514 ThreadBlockInVM tbivm(jt); | |
5515 | |
5516 // Don't wait if cannot get lock since interference arises from | |
5517 // unblocking. Also. check interrupt before trying wait | |
5518 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
5519 return; | |
5520 } | |
5521 | |
5522 int status ; | |
5523 if (_counter > 0) { // no wait needed | |
5524 _counter = 0; | |
5525 status = pthread_mutex_unlock(_mutex); | |
5526 assert (status == 0, "invariant") ; | |
7629
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5527 // Paranoia to ensure our locked and lock-free paths interact |
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|
5528 // correctly with each other and Java-level accesses. |
1117
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|
5529 OrderAccess::fence(); |
0 | 5530 return; |
5531 } | |
5532 | |
5533 #ifdef ASSERT | |
5534 // Don't catch signals while blocked; let the running threads have the signals. | |
5535 // (This allows a debugger to break into the running thread.) | |
5536 sigset_t oldsigs; | |
5537 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
5538 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
5539 #endif | |
5540 | |
5541 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5542 jt->set_suspend_equivalent(); | |
5543 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5544 | |
5545 if (time == 0) { | |
5546 status = pthread_cond_wait (_cond, _mutex) ; | |
5547 } else { | |
5548 status = os::Linux::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
5549 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5550 pthread_cond_destroy (_cond) ; | |
5551 pthread_cond_init (_cond, NULL); | |
5552 } | |
5553 } | |
5554 assert_status(status == 0 || status == EINTR || | |
5555 status == ETIME || status == ETIMEDOUT, | |
5556 status, "cond_timedwait"); | |
5557 | |
5558 #ifdef ASSERT | |
5559 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
5560 #endif | |
5561 | |
5562 _counter = 0 ; | |
5563 status = pthread_mutex_unlock(_mutex) ; | |
5564 assert_status(status == 0, status, "invariant") ; | |
7629
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|
5565 // Paranoia to ensure our locked and lock-free paths interact |
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|
5566 // correctly with each other and Java-level accesses. |
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changeset
|
5567 OrderAccess::fence(); |
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|
5568 |
0 | 5569 // If externally suspended while waiting, re-suspend |
5570 if (jt->handle_special_suspend_equivalent_condition()) { | |
5571 jt->java_suspend_self(); | |
5572 } | |
5573 } | |
5574 | |
5575 void Parker::unpark() { | |
5576 int s, status ; | |
5577 status = pthread_mutex_lock(_mutex); | |
5578 assert (status == 0, "invariant") ; | |
5579 s = _counter; | |
5580 _counter = 1; | |
5581 if (s < 1) { | |
5582 if (WorkAroundNPTLTimedWaitHang) { | |
5583 status = pthread_cond_signal (_cond) ; | |
5584 assert (status == 0, "invariant") ; | |
5585 status = pthread_mutex_unlock(_mutex); | |
5586 assert (status == 0, "invariant") ; | |
5587 } else { | |
5588 status = pthread_mutex_unlock(_mutex); | |
5589 assert (status == 0, "invariant") ; | |
5590 status = pthread_cond_signal (_cond) ; | |
5591 assert (status == 0, "invariant") ; | |
5592 } | |
5593 } else { | |
5594 pthread_mutex_unlock(_mutex); | |
5595 assert (status == 0, "invariant") ; | |
5596 } | |
5597 } | |
5598 | |
5599 | |
5600 extern char** environ; | |
5601 | |
5602 #ifndef __NR_fork | |
5603 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
5604 #endif | |
5605 | |
5606 #ifndef __NR_execve | |
5607 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
5608 #endif | |
5609 | |
5610 // Run the specified command in a separate process. Return its exit value, | |
5611 // or -1 on failure (e.g. can't fork a new process). | |
5612 // Unlike system(), this function can be called from signal handler. It | |
5613 // doesn't block SIGINT et al. | |
5614 int os::fork_and_exec(char* cmd) { | |
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diff
changeset
|
5615 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
0 | 5616 |
5617 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
5618 // pthread_atfork handlers and reset pthread library. All we need is a | |
5619 // separate process to execve. Make a direct syscall to fork process. | |
5620 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
5621 // the best... | |
5622 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
5623 IA64_ONLY(fork();) | |
5624 | |
5625 if (pid < 0) { | |
5626 // fork failed | |
5627 return -1; | |
5628 | |
5629 } else if (pid == 0) { | |
5630 // child process | |
5631 | |
5632 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
5633 // first to kill every thread on the thread list. Because this list is | |
5634 // not reset by fork() (see notes above), execve() will instead kill | |
5635 // every thread in the parent process. We know this is the only thread | |
5636 // in the new process, so make a system call directly. | |
5637 // IA64 should use normal execve() from glibc to match the glibc fork() | |
5638 // above. | |
5639 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);) | |
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diff
changeset
|
5640 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
0 | 5641 |
5642 // execve failed | |
5643 _exit(-1); | |
5644 | |
5645 } else { | |
5646 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
5647 // care about the actual exit code, for now. | |
5648 | |
5649 int status; | |
5650 | |
5651 // Wait for the child process to exit. This returns immediately if | |
5652 // the child has already exited. */ | |
5653 while (waitpid(pid, &status, 0) < 0) { | |
5654 switch (errno) { | |
5655 case ECHILD: return 0; | |
5656 case EINTR: break; | |
5657 default: return -1; | |
5658 } | |
5659 } | |
5660 | |
5661 if (WIFEXITED(status)) { | |
5662 // The child exited normally; get its exit code. | |
5663 return WEXITSTATUS(status); | |
5664 } else if (WIFSIGNALED(status)) { | |
5665 // The child exited because of a signal | |
5666 // The best value to return is 0x80 + signal number, | |
5667 // because that is what all Unix shells do, and because | |
5668 // it allows callers to distinguish between process exit and | |
5669 // process death by signal. | |
5670 return 0x80 + WTERMSIG(status); | |
5671 } else { | |
5672 // Unknown exit code; pass it through | |
5673 return status; | |
5674 } | |
5675 } | |
5676 } | |
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|
5677 |
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|
5678 // is_headless_jre() |
126ea7725993
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|
5679 // |
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diff
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|
5680 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
1681
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diff
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|
5681 // in order to report if we are running in a headless jre |
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|
5682 // |
4082
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|
5683 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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dholmes
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|
5684 // as libawt.so, and renamed libawt_xawt.so |
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changeset
|
5685 // |
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diff
changeset
|
5686 bool os::is_headless_jre() { |
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diff
changeset
|
5687 struct stat statbuf; |
126ea7725993
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diff
changeset
|
5688 char buf[MAXPATHLEN]; |
126ea7725993
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diff
changeset
|
5689 char libmawtpath[MAXPATHLEN]; |
126ea7725993
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diff
changeset
|
5690 const char *xawtstr = "/xawt/libmawt.so"; |
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|
5691 const char *new_xawtstr = "/libawt_xawt.so"; |
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changeset
|
5692 char *p; |
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diff
changeset
|
5693 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5694 // Get path to libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5695 os::jvm_path(buf, sizeof(buf)); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5696 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5697 // Get rid of libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5698 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5699 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5700 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5701 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5702 // Get rid of client or server |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5703 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5704 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5705 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5706 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5707 // check xawt/libmawt.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5708 strcpy(libmawtpath, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5709 strcat(libmawtpath, xawtstr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5710 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5711 |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5712 // check libawt_xawt.so |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5713 strcpy(libmawtpath, buf); |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5714 strcat(libmawtpath, new_xawtstr); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5715 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5716 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5717 return true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5718 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5719 |
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5720 // Get the default path to the core file |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5721 // Returns the length of the string |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5722 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
|
5723 const char* p = get_current_directory(buffer, bufferSize); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5724 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5725 if (p == NULL) { |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5726 assert(p != NULL, "failed to get current directory"); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5727 return 0; |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5728 } |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5729 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5730 return strlen(buffer); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5731 } |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5732 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5733 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5734 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5735 // A thread to watch the '/dev/mem_notify' device, which will tell us when the OS is running low on memory. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5736 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5737 MemNotifyThread* MemNotifyThread::_memnotify_thread = NULL; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5738 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5739 // ctor |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5740 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5741 MemNotifyThread::MemNotifyThread(int fd): Thread() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5742 assert(memnotify_thread() == NULL, "we can only allocate one MemNotifyThread"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5743 _fd = fd; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5744 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5745 if (os::create_thread(this, os::os_thread)) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5746 _memnotify_thread = this; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5747 os::set_priority(this, NearMaxPriority); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5748 os::start_thread(this); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5749 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5750 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5751 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5752 // Where all the work gets done |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5753 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5754 void MemNotifyThread::run() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5755 assert(this == memnotify_thread(), "expected the singleton MemNotifyThread"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5756 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5757 // Set up the select arguments |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5758 fd_set rfds; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5759 if (_fd != -1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5760 FD_ZERO(&rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5761 FD_SET(_fd, &rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5762 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5763 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5764 // Now wait for the mem_notify device to wake up |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5765 while (1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5766 // Wait for the mem_notify device to signal us.. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5767 int rc = select(_fd+1, _fd != -1 ? &rfds : NULL, NULL, NULL, NULL); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5768 if (rc == -1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5769 perror("select!\n"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5770 break; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5771 } else if (rc) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5772 //ssize_t free_before = os::available_memory(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5773 //tty->print ("Notified: Free: %dK \n",os::available_memory()/1024); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5774 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5775 // The kernel is telling us there is not much memory left... |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5776 // try to do something about that |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5777 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5778 // If we are not already in a GC, try one. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5779 if (!Universe::heap()->is_gc_active()) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5780 Universe::heap()->collect(GCCause::_allocation_failure); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5781 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5782 //ssize_t free_after = os::available_memory(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5783 //tty->print ("Post-Notify: Free: %dK\n",free_after/1024); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5784 //tty->print ("GC freed: %dK\n", (free_after - free_before)/1024); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5785 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5786 // We might want to do something like the following if we find the GC's are not helping... |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5787 // Universe::heap()->size_policy()->set_gc_time_limit_exceeded(true); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5788 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5789 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5790 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5791 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5792 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5793 // See if the /dev/mem_notify device exists, and if so, start a thread to monitor it. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5794 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5795 void MemNotifyThread::start() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5796 int fd; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5797 fd = open ("/dev/mem_notify", O_RDONLY, 0); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5798 if (fd < 0) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5799 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5800 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5801 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5802 if (memnotify_thread() == NULL) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5803 new MemNotifyThread(fd); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5804 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5805 } |
10405 | 5806 |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5807 #endif // JAVASE_EMBEDDED |