Mercurial > hg > truffle
annotate src/os/linux/vm/os_linux.cpp @ 2281:0579225e0670
Merge.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Mon, 04 Apr 2011 20:00:55 +0200 |
parents | 0cd39a385a72 |
children | 0654ee04b214 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2011, 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 | |
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25 # define __STDC_FORMAT_MACROS |
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26 |
1972 | 27 // no precompiled headers |
28 #include "classfile/classLoader.hpp" | |
29 #include "classfile/systemDictionary.hpp" | |
30 #include "classfile/vmSymbols.hpp" | |
31 #include "code/icBuffer.hpp" | |
32 #include "code/vtableStubs.hpp" | |
33 #include "compiler/compileBroker.hpp" | |
34 #include "interpreter/interpreter.hpp" | |
35 #include "jvm_linux.h" | |
36 #include "memory/allocation.inline.hpp" | |
37 #include "memory/filemap.hpp" | |
38 #include "mutex_linux.inline.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "os_share_linux.hpp" | |
41 #include "prims/jniFastGetField.hpp" | |
42 #include "prims/jvm.h" | |
43 #include "prims/jvm_misc.hpp" | |
44 #include "runtime/arguments.hpp" | |
45 #include "runtime/extendedPC.hpp" | |
46 #include "runtime/globals.hpp" | |
47 #include "runtime/interfaceSupport.hpp" | |
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" | |
57 #include "runtime/threadCritical.hpp" | |
58 #include "runtime/timer.hpp" | |
59 #include "services/attachListener.hpp" | |
60 #include "services/runtimeService.hpp" | |
61 #include "thread_linux.inline.hpp" | |
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62 #include "utilities/decoder.hpp" |
1972 | 63 #include "utilities/defaultStream.hpp" |
64 #include "utilities/events.hpp" | |
65 #include "utilities/growableArray.hpp" | |
66 #include "utilities/vmError.hpp" | |
67 #ifdef TARGET_ARCH_x86 | |
68 # include "assembler_x86.inline.hpp" | |
69 # include "nativeInst_x86.hpp" | |
70 #endif | |
71 #ifdef TARGET_ARCH_sparc | |
72 # include "assembler_sparc.inline.hpp" | |
73 # include "nativeInst_sparc.hpp" | |
74 #endif | |
75 #ifdef TARGET_ARCH_zero | |
76 # include "assembler_zero.inline.hpp" | |
77 # include "nativeInst_zero.hpp" | |
78 #endif | |
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79 #ifdef TARGET_ARCH_arm |
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80 # include "assembler_arm.inline.hpp" |
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81 # include "nativeInst_arm.hpp" |
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82 #endif |
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83 #ifdef TARGET_ARCH_ppc |
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84 # include "assembler_ppc.inline.hpp" |
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85 # include "nativeInst_ppc.hpp" |
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86 #endif |
1972 | 87 #ifdef COMPILER1 |
88 #include "c1/c1_Runtime1.hpp" | |
89 #endif | |
90 #ifdef COMPILER2 | |
91 #include "opto/runtime.hpp" | |
92 #endif | |
0 | 93 |
94 // put OS-includes here | |
95 # include <sys/types.h> | |
96 # include <sys/mman.h> | |
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97 # include <sys/stat.h> |
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98 # include <sys/select.h> |
0 | 99 # include <pthread.h> |
100 # include <signal.h> | |
101 # include <errno.h> | |
102 # include <dlfcn.h> | |
103 # include <stdio.h> | |
104 # include <unistd.h> | |
105 # include <sys/resource.h> | |
106 # include <pthread.h> | |
107 # include <sys/stat.h> | |
108 # include <sys/time.h> | |
109 # include <sys/times.h> | |
110 # include <sys/utsname.h> | |
111 # include <sys/socket.h> | |
112 # include <sys/wait.h> | |
113 # include <pwd.h> | |
114 # include <poll.h> | |
115 # include <semaphore.h> | |
116 # include <fcntl.h> | |
117 # include <string.h> | |
118 # include <syscall.h> | |
119 # include <sys/sysinfo.h> | |
120 # include <gnu/libc-version.h> | |
121 # include <sys/ipc.h> | |
122 # include <sys/shm.h> | |
123 # include <link.h> | |
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124 # include <stdint.h> |
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125 # include <inttypes.h> |
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126 # include <sys/ioctl.h> |
0 | 127 |
128 #define MAX_PATH (2 * K) | |
129 | |
130 // for timer info max values which include all bits | |
131 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
132 #define SEC_IN_NANOSECS 1000000000LL | |
133 | |
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134 #define LARGEPAGES_BIT (1 << 6) |
0 | 135 //////////////////////////////////////////////////////////////////////////////// |
136 // global variables | |
137 julong os::Linux::_physical_memory = 0; | |
138 | |
139 address os::Linux::_initial_thread_stack_bottom = NULL; | |
140 uintptr_t os::Linux::_initial_thread_stack_size = 0; | |
141 | |
142 int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
143 int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
144 Mutex* os::Linux::_createThread_lock = NULL; | |
145 pthread_t os::Linux::_main_thread; | |
146 int os::Linux::_page_size = -1; | |
147 bool os::Linux::_is_floating_stack = false; | |
148 bool os::Linux::_is_NPTL = false; | |
149 bool os::Linux::_supports_fast_thread_cpu_time = false; | |
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150 const char * os::Linux::_glibc_version = NULL; |
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151 const char * os::Linux::_libpthread_version = NULL; |
0 | 152 |
153 static jlong initial_time_count=0; | |
154 | |
155 static int clock_tics_per_sec = 100; | |
156 | |
157 // For diagnostics to print a message once. see run_periodic_checks | |
158 static sigset_t check_signal_done; | |
159 static bool check_signals = true;; | |
160 | |
161 static pid_t _initial_pid = 0; | |
162 | |
163 /* Signal number used to suspend/resume a thread */ | |
164 | |
165 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
166 static int SR_signum = SIGUSR2; | |
167 sigset_t SR_sigset; | |
168 | |
242 | 169 /* Used to protect dlsym() calls */ |
170 static pthread_mutex_t dl_mutex; | |
171 | |
0 | 172 //////////////////////////////////////////////////////////////////////////////// |
173 // utility functions | |
174 | |
175 static int SR_initialize(); | |
176 static int SR_finalize(); | |
177 | |
178 julong os::available_memory() { | |
179 return Linux::available_memory(); | |
180 } | |
181 | |
182 julong os::Linux::available_memory() { | |
183 // values in struct sysinfo are "unsigned long" | |
184 struct sysinfo si; | |
185 sysinfo(&si); | |
186 | |
187 return (julong)si.freeram * si.mem_unit; | |
188 } | |
189 | |
190 julong os::physical_memory() { | |
191 return Linux::physical_memory(); | |
192 } | |
193 | |
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194 julong os::allocatable_physical_memory(julong size) { |
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195 #ifdef _LP64 |
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196 return size; |
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197 #else |
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198 julong result = MIN2(size, (julong)3800*M); |
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199 if (!is_allocatable(result)) { |
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200 // See comments under solaris for alignment considerations |
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201 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); |
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202 result = MIN2(size, reasonable_size); |
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203 } |
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204 return result; |
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205 #endif // _LP64 |
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206 } |
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207 |
0 | 208 //////////////////////////////////////////////////////////////////////////////// |
209 // environment support | |
210 | |
211 bool os::getenv(const char* name, char* buf, int len) { | |
212 const char* val = ::getenv(name); | |
213 if (val != NULL && strlen(val) < (size_t)len) { | |
214 strcpy(buf, val); | |
215 return true; | |
216 } | |
217 if (len > 0) buf[0] = 0; // return a null string | |
218 return false; | |
219 } | |
220 | |
221 | |
222 // Return true if user is running as root. | |
223 | |
224 bool os::have_special_privileges() { | |
225 static bool init = false; | |
226 static bool privileges = false; | |
227 if (!init) { | |
228 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
229 init = true; | |
230 } | |
231 return privileges; | |
232 } | |
233 | |
234 | |
235 #ifndef SYS_gettid | |
236 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
237 #ifdef __ia64__ | |
238 #define SYS_gettid 1105 | |
239 #elif __i386__ | |
240 #define SYS_gettid 224 | |
241 #elif __amd64__ | |
242 #define SYS_gettid 186 | |
243 #elif __sparc__ | |
244 #define SYS_gettid 143 | |
245 #else | |
246 #error define gettid for the arch | |
247 #endif | |
248 #endif | |
249 | |
250 // Cpu architecture string | |
1010 | 251 #if defined(ZERO) |
252 static char cpu_arch[] = ZERO_LIBARCH; | |
253 #elif defined(IA64) | |
0 | 254 static char cpu_arch[] = "ia64"; |
255 #elif defined(IA32) | |
256 static char cpu_arch[] = "i386"; | |
257 #elif defined(AMD64) | |
258 static char cpu_arch[] = "amd64"; | |
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259 #elif defined(ARM) |
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260 static char cpu_arch[] = "arm"; |
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261 #elif defined(PPC) |
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262 static char cpu_arch[] = "ppc"; |
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 // | |
324 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. | |
325 // This library should be located at: | |
326 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. | |
327 // | |
328 // If "/jre/lib/" appears at the right place in the path, then we | |
329 // assume libjvm[_g].so is installed in a JDK and we use this path. | |
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>, | |
339 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so | |
340 // it looks like libjvm[_g].so is installed there | |
341 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. | |
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: | |
349 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n)) | |
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 */ | |
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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) { | |
617 char *str = (char *)malloc(n); | |
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) { | |
630 char *str = (char *)malloc(n); | |
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: | |
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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 #ifndef IA64 | |
1159 if (stack_size > 2 * K * K) stack_size = 2 * K * K; | |
1160 #else | |
1161 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
1162 if (stack_size > 4 * K * K) stack_size = 4 * K * K; | |
1163 #endif | |
1164 | |
1165 // Try to figure out where the stack base (top) is. This is harder. | |
1166 // | |
1167 // When an application is started, glibc saves the initial stack pointer in | |
1168 // a global variable "__libc_stack_end", which is then used by system | |
1169 // libraries. __libc_stack_end should be pretty close to stack top. The | |
1170 // variable is available since the very early days. However, because it is | |
1171 // a private interface, it could disappear in the future. | |
1172 // | |
1173 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
1174 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
1175 // stack top. Note that /proc may not exist if VM is running as a chroot | |
1176 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
1177 // /proc/<pid>/stat could change in the future (though unlikely). | |
1178 // | |
1179 // We try __libc_stack_end first. If that doesn't work, look for | |
1180 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
1181 // as a hint, which should work well in most cases. | |
1182 | |
1183 uintptr_t stack_start; | |
1184 | |
1185 // try __libc_stack_end first | |
1186 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
1187 if (p && *p) { | |
1188 stack_start = *p; | |
1189 } else { | |
1190 // see if we can get the start_stack field from /proc/self/stat | |
1191 FILE *fp; | |
1192 int pid; | |
1193 char state; | |
1194 int ppid; | |
1195 int pgrp; | |
1196 int session; | |
1197 int nr; | |
1198 int tpgrp; | |
1199 unsigned long flags; | |
1200 unsigned long minflt; | |
1201 unsigned long cminflt; | |
1202 unsigned long majflt; | |
1203 unsigned long cmajflt; | |
1204 unsigned long utime; | |
1205 unsigned long stime; | |
1206 long cutime; | |
1207 long cstime; | |
1208 long prio; | |
1209 long nice; | |
1210 long junk; | |
1211 long it_real; | |
1212 uintptr_t start; | |
1213 uintptr_t vsize; | |
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1214 intptr_t rss; |
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1215 uintptr_t rsslim; |
0 | 1216 uintptr_t scodes; |
1217 uintptr_t ecode; | |
1218 int i; | |
1219 | |
1220 // Figure what the primordial thread stack base is. Code is inspired | |
1221 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
1222 // followed by command name surrounded by parentheses, state, etc. | |
1223 char stat[2048]; | |
1224 int statlen; | |
1225 | |
1226 fp = fopen("/proc/self/stat", "r"); | |
1227 if (fp) { | |
1228 statlen = fread(stat, 1, 2047, fp); | |
1229 stat[statlen] = '\0'; | |
1230 fclose(fp); | |
1231 | |
1232 // Skip pid and the command string. Note that we could be dealing with | |
1233 // weird command names, e.g. user could decide to rename java launcher | |
1234 // to "java 1.4.2 :)", then the stat file would look like | |
1235 // 1234 (java 1.4.2 :)) R ... ... | |
1236 // We don't really need to know the command string, just find the last | |
1237 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
1238 char * s = strrchr(stat, ')'); | |
1239 | |
1240 i = 0; | |
1241 if (s) { | |
1242 // Skip blank chars | |
1243 do s++; while (isspace(*s)); | |
1244 | |
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1245 #define _UFM UINTX_FORMAT |
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1246 #define _DFM INTX_FORMAT |
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1247 |
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1248 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1249 /* 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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1250 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 | 1251 &state, /* 3 %c */ |
1252 &ppid, /* 4 %d */ | |
1253 &pgrp, /* 5 %d */ | |
1254 &session, /* 6 %d */ | |
1255 &nr, /* 7 %d */ | |
1256 &tpgrp, /* 8 %d */ | |
1257 &flags, /* 9 %lu */ | |
1258 &minflt, /* 10 %lu */ | |
1259 &cminflt, /* 11 %lu */ | |
1260 &majflt, /* 12 %lu */ | |
1261 &cmajflt, /* 13 %lu */ | |
1262 &utime, /* 14 %lu */ | |
1263 &stime, /* 15 %lu */ | |
1264 &cutime, /* 16 %ld */ | |
1265 &cstime, /* 17 %ld */ | |
1266 &prio, /* 18 %ld */ | |
1267 &nice, /* 19 %ld */ | |
1268 &junk, /* 20 %ld */ | |
1269 &it_real, /* 21 %ld */ | |
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1270 &start, /* 22 UINTX_FORMAT */ |
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1271 &vsize, /* 23 UINTX_FORMAT */ |
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1272 &rss, /* 24 INTX_FORMAT */ |
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1273 &rsslim, /* 25 UINTX_FORMAT */ |
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1274 &scodes, /* 26 UINTX_FORMAT */ |
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1275 &ecode, /* 27 UINTX_FORMAT */ |
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1276 &stack_start); /* 28 UINTX_FORMAT */ |
0 | 1277 } |
1278 | |
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1279 #undef _UFM |
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1280 #undef _DFM |
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1281 |
0 | 1282 if (i != 28 - 2) { |
1283 assert(false, "Bad conversion from /proc/self/stat"); | |
1284 // product mode - assume we are the initial thread, good luck in the | |
1285 // embedded case. | |
1286 warning("Can't detect initial thread stack location - bad conversion"); | |
1287 stack_start = (uintptr_t) &rlim; | |
1288 } | |
1289 } else { | |
1290 // For some reason we can't open /proc/self/stat (for example, running on | |
1291 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
1292 // most cases, so don't abort: | |
1293 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
1294 stack_start = (uintptr_t) &rlim; | |
1295 } | |
1296 } | |
1297 | |
1298 // Now we have a pointer (stack_start) very close to the stack top, the | |
1299 // next thing to do is to figure out the exact location of stack top. We | |
1300 // can find out the virtual memory area that contains stack_start by | |
1301 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
1302 // and its upper limit is the real stack top. (again, this would fail if | |
1303 // running inside chroot, because /proc may not exist.) | |
1304 | |
1305 uintptr_t stack_top; | |
1306 address low, high; | |
1307 if (find_vma((address)stack_start, &low, &high)) { | |
1308 // success, "high" is the true stack top. (ignore "low", because initial | |
1309 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
1310 stack_top = (uintptr_t)high; | |
1311 } else { | |
1312 // failed, likely because /proc/self/maps does not exist | |
1313 warning("Can't detect initial thread stack location - find_vma failed"); | |
1314 // best effort: stack_start is normally within a few pages below the real | |
1315 // stack top, use it as stack top, and reduce stack size so we won't put | |
1316 // guard page outside stack. | |
1317 stack_top = stack_start; | |
1318 stack_size -= 16 * page_size(); | |
1319 } | |
1320 | |
1321 // stack_top could be partially down the page so align it | |
1322 stack_top = align_size_up(stack_top, page_size()); | |
1323 | |
1324 if (max_size && stack_size > max_size) { | |
1325 _initial_thread_stack_size = max_size; | |
1326 } else { | |
1327 _initial_thread_stack_size = stack_size; | |
1328 } | |
1329 | |
1330 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
1331 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
1332 } | |
1333 | |
1334 //////////////////////////////////////////////////////////////////////////////// | |
1335 // time support | |
1336 | |
1337 // Time since start-up in seconds to a fine granularity. | |
1338 // Used by VMSelfDestructTimer and the MemProfiler. | |
1339 double os::elapsedTime() { | |
1340 | |
1341 return (double)(os::elapsed_counter()) * 0.000001; | |
1342 } | |
1343 | |
1344 jlong os::elapsed_counter() { | |
1345 timeval time; | |
1346 int status = gettimeofday(&time, NULL); | |
1347 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
1348 } | |
1349 | |
1350 jlong os::elapsed_frequency() { | |
1351 return (1000 * 1000); | |
1352 } | |
1353 | |
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1354 // For now, we say that linux does not support vtime. I have no idea |
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1355 // whether it can actually be made to (DLD, 9/13/05). |
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1356 |
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1357 bool os::supports_vtime() { return false; } |
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1358 bool os::enable_vtime() { return false; } |
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1359 bool os::vtime_enabled() { return false; } |
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1360 double os::elapsedVTime() { |
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1361 // better than nothing, but not much |
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1362 return elapsedTime(); |
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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 | |
1681
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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 | |
1634 void os::dll_build_name(char* buffer, size_t buflen, | |
1635 const char* pname, const char* fname) { | |
1636 // Copied from libhpi | |
242 | 1637 const size_t pnamelen = pname ? strlen(pname) : 0; |
1638 | |
691 | 1639 // Quietly truncate on buffer overflow. Should be an error. |
242 | 1640 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
1641 *buffer = '\0'; | |
1642 return; | |
1643 } | |
1644 | |
1645 if (pnamelen == 0) { | |
691 | 1646 snprintf(buffer, buflen, "lib%s.so", fname); |
1647 } else if (strchr(pname, *os::path_separator()) != NULL) { | |
1648 int n; | |
1649 char** pelements = split_path(pname, &n); | |
1650 for (int i = 0 ; i < n ; i++) { | |
1651 // Really shouldn't be NULL, but check can't hurt | |
1652 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1653 continue; // skip the empty path values | |
1654 } | |
1655 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1656 if (file_exists(buffer)) { | |
1657 break; | |
1658 } | |
1659 } | |
1660 // release the storage | |
1661 for (int i = 0 ; i < n ; i++) { | |
1662 if (pelements[i] != NULL) { | |
1663 FREE_C_HEAP_ARRAY(char, pelements[i]); | |
1664 } | |
1665 } | |
1666 if (pelements != NULL) { | |
1667 FREE_C_HEAP_ARRAY(char*, pelements); | |
1668 } | |
242 | 1669 } else { |
691 | 1670 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
242 | 1671 } |
1672 } | |
1673 | |
0 | 1674 const char* os::get_current_directory(char *buf, int buflen) { |
1675 return getcwd(buf, buflen); | |
1676 } | |
1677 | |
1678 // check if addr is inside libjvm[_g].so | |
1679 bool os::address_is_in_vm(address addr) { | |
1680 static address libjvm_base_addr; | |
1681 Dl_info dlinfo; | |
1682 | |
1683 if (libjvm_base_addr == NULL) { | |
1684 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
1685 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
1686 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
1687 } | |
1688 | |
1689 if (dladdr((void *)addr, &dlinfo)) { | |
1690 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
1691 } | |
1692 | |
1693 return false; | |
1694 } | |
1695 | |
1696 bool os::dll_address_to_function_name(address addr, char *buf, | |
1697 int buflen, int *offset) { | |
1698 Dl_info dlinfo; | |
1699 | |
1700 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { | |
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1701 if (buf != NULL) { |
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1702 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
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1703 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
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1704 } |
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|
1705 } |
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1706 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
0 | 1707 return true; |
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1708 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { |
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1709 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
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1710 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) { |
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|
1711 return true; |
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|
1712 } |
0 | 1713 } |
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1714 |
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|
1715 if (buf != NULL) buf[0] = '\0'; |
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1716 if (offset != NULL) *offset = -1; |
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1717 return false; |
0 | 1718 } |
1719 | |
1720 struct _address_to_library_name { | |
1721 address addr; // input : memory address | |
1722 size_t buflen; // size of fname | |
1723 char* fname; // output: library name | |
1724 address base; // library base addr | |
1725 }; | |
1726 | |
1727 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
1728 size_t size, void *data) { | |
1729 int i; | |
1730 bool found = false; | |
1731 address libbase = NULL; | |
1732 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
1733 | |
1734 // iterate through all loadable segments | |
1735 for (i = 0; i < info->dlpi_phnum; i++) { | |
1736 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
1737 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
1738 // base address of a library is the lowest address of its loaded | |
1739 // segments. | |
1740 if (libbase == NULL || libbase > segbase) { | |
1741 libbase = segbase; | |
1742 } | |
1743 // see if 'addr' is within current segment | |
1744 if (segbase <= d->addr && | |
1745 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
1746 found = true; | |
1747 } | |
1748 } | |
1749 } | |
1750 | |
1751 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
1752 // so dll_address_to_library_name() can fall through to use dladdr() which | |
1753 // can figure out executable name from argv[0]. | |
1754 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
1755 d->base = libbase; | |
1756 if (d->fname) { | |
1757 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
1758 } | |
1759 return 1; | |
1760 } | |
1761 return 0; | |
1762 } | |
1763 | |
1764 bool os::dll_address_to_library_name(address addr, char* buf, | |
1765 int buflen, int* offset) { | |
1766 Dl_info dlinfo; | |
1767 struct _address_to_library_name data; | |
1768 | |
1769 // There is a bug in old glibc dladdr() implementation that it could resolve | |
1770 // to wrong library name if the .so file has a base address != NULL. Here | |
1771 // we iterate through the program headers of all loaded libraries to find | |
1772 // out which library 'addr' really belongs to. This workaround can be | |
1773 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
1774 data.addr = addr; | |
1775 data.fname = buf; | |
1776 data.buflen = buflen; | |
1777 data.base = NULL; | |
1778 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
1779 | |
1780 if (rslt) { | |
1781 // buf already contains library name | |
1782 if (offset) *offset = addr - data.base; | |
1783 return true; | |
1784 } else if (dladdr((void*)addr, &dlinfo)){ | |
1785 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
1786 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
1787 return true; | |
1788 } else { | |
1789 if (buf) buf[0] = '\0'; | |
1790 if (offset) *offset = -1; | |
1791 return false; | |
1792 } | |
1793 } | |
1794 | |
1795 // Loads .dll/.so and | |
1796 // in case of error it checks if .dll/.so was built for the | |
1797 // same architecture as Hotspot is running on | |
1798 | |
1799 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1800 { | |
1801 void * result= ::dlopen(filename, RTLD_LAZY); | |
1802 if (result != NULL) { | |
1803 // Successful loading | |
1804 return result; | |
1805 } | |
1806 | |
1807 Elf32_Ehdr elf_head; | |
1808 | |
1809 // Read system error message into ebuf | |
1810 // It may or may not be overwritten below | |
1811 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1812 ebuf[ebuflen-1]='\0'; | |
1813 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1814 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1815 | |
1816 if (diag_msg_max_length==0) { | |
1817 // No more space in ebuf for additional diagnostics message | |
1818 return NULL; | |
1819 } | |
1820 | |
1821 | |
1822 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1823 | |
1824 if (file_descriptor < 0) { | |
1825 // Can't open library, report dlerror() message | |
1826 return NULL; | |
1827 } | |
1828 | |
1829 bool failed_to_read_elf_head= | |
1830 (sizeof(elf_head)!= | |
1831 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1832 | |
1833 ::close(file_descriptor); | |
1834 if (failed_to_read_elf_head) { | |
1835 // file i/o error - report dlerror() msg | |
1836 return NULL; | |
1837 } | |
1838 | |
1839 typedef struct { | |
1840 Elf32_Half code; // Actual value as defined in elf.h | |
1841 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1842 char elf_class; // 32 or 64 bit | |
1843 char endianess; // MSB or LSB | |
1844 char* name; // String representation | |
1845 } arch_t; | |
1846 | |
1847 #ifndef EM_486 | |
1848 #define EM_486 6 /* Intel 80486 */ | |
1849 #endif | |
1850 | |
1851 static const arch_t arch_array[]={ | |
1852 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1853 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1854 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1855 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1856 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1857 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1858 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1859 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1010 | 1860 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
1861 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1862 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1863 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1864 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1865 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1866 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1867 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
0 | 1868 }; |
1869 | |
1870 #if (defined IA32) | |
1871 static Elf32_Half running_arch_code=EM_386; | |
1872 #elif (defined AMD64) | |
1873 static Elf32_Half running_arch_code=EM_X86_64; | |
1874 #elif (defined IA64) | |
1875 static Elf32_Half running_arch_code=EM_IA_64; | |
1876 #elif (defined __sparc) && (defined _LP64) | |
1877 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1878 #elif (defined __sparc) && (!defined _LP64) | |
1879 static Elf32_Half running_arch_code=EM_SPARC; | |
1880 #elif (defined __powerpc64__) | |
1881 static Elf32_Half running_arch_code=EM_PPC64; | |
1882 #elif (defined __powerpc__) | |
1883 static Elf32_Half running_arch_code=EM_PPC; | |
1010 | 1884 #elif (defined ARM) |
1885 static Elf32_Half running_arch_code=EM_ARM; | |
1886 #elif (defined S390) | |
1887 static Elf32_Half running_arch_code=EM_S390; | |
1888 #elif (defined ALPHA) | |
1889 static Elf32_Half running_arch_code=EM_ALPHA; | |
1890 #elif (defined MIPSEL) | |
1891 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1892 #elif (defined PARISC) | |
1893 static Elf32_Half running_arch_code=EM_PARISC; | |
1894 #elif (defined MIPS) | |
1895 static Elf32_Half running_arch_code=EM_MIPS; | |
1896 #elif (defined M68K) | |
1897 static Elf32_Half running_arch_code=EM_68K; | |
0 | 1898 #else |
1899 #error Method os::dll_load requires that one of following is defined:\ | |
1010 | 1900 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
0 | 1901 #endif |
1902 | |
1903 // Identify compatability class for VM's architecture and library's architecture | |
1904 // Obtain string descriptions for architectures | |
1905 | |
1906 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1907 int running_arch_index=-1; | |
1908 | |
1909 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1910 if (running_arch_code == arch_array[i].code) { | |
1911 running_arch_index = i; | |
1912 } | |
1913 if (lib_arch.code == arch_array[i].code) { | |
1914 lib_arch.compat_class = arch_array[i].compat_class; | |
1915 lib_arch.name = arch_array[i].name; | |
1916 } | |
1917 } | |
1918 | |
1919 assert(running_arch_index != -1, | |
1920 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1921 if (running_arch_index == -1) { | |
1922 // Even though running architecture detection failed | |
1923 // we may still continue with reporting dlerror() message | |
1924 return NULL; | |
1925 } | |
1926 | |
1927 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1928 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1929 return NULL; | |
1930 } | |
1931 | |
1010 | 1932 #ifndef S390 |
0 | 1933 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
1934 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1935 return NULL; | |
1936 } | |
1010 | 1937 #endif // !S390 |
0 | 1938 |
1939 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1940 if ( lib_arch.name!=NULL ) { | |
1941 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1942 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1943 lib_arch.name, arch_array[running_arch_index].name); | |
1944 } else { | |
1945 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1946 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1947 lib_arch.code, | |
1948 arch_array[running_arch_index].name); | |
1949 } | |
1950 } | |
1951 | |
1952 return NULL; | |
1953 } | |
1954 | |
242 | 1955 /* |
1956 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
1957 * chances are you might want to run the generated bits against glibc-2.0 | |
1958 * libdl.so, so always use locking for any version of glibc. | |
1959 */ | |
1960 void* os::dll_lookup(void* handle, const char* name) { | |
1961 pthread_mutex_lock(&dl_mutex); | |
1962 void* res = dlsym(handle, name); | |
1963 pthread_mutex_unlock(&dl_mutex); | |
1964 return res; | |
1965 } | |
0 | 1966 |
1967 | |
1980
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1968 static bool _print_ascii_file(const char* filename, outputStream* st) { |
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1969 int fd = ::open(filename, O_RDONLY); |
0 | 1970 if (fd == -1) { |
1971 return false; | |
1972 } | |
1973 | |
1974 char buf[32]; | |
1975 int bytes; | |
1980
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1976 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
0 | 1977 st->print_raw(buf, bytes); |
1978 } | |
1979 | |
1980
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1980 ::close(fd); |
0 | 1981 |
1982 return true; | |
1983 } | |
1984 | |
1985 void os::print_dll_info(outputStream *st) { | |
1986 st->print_cr("Dynamic libraries:"); | |
1987 | |
1988 char fname[32]; | |
1989 pid_t pid = os::Linux::gettid(); | |
1990 | |
1991 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
1992 | |
1993 if (!_print_ascii_file(fname, st)) { | |
1994 st->print("Can not get library information for pid = %d\n", pid); | |
1995 } | |
1996 } | |
1997 | |
1998 | |
1999 void os::print_os_info(outputStream* st) { | |
2000 st->print("OS:"); | |
2001 | |
2002 // Try to identify popular distros. | |
2003 // Most Linux distributions have /etc/XXX-release file, which contains | |
2004 // the OS version string. Some have more than one /etc/XXX-release file | |
2005 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), | |
2006 // so the order is important. | |
2007 if (!_print_ascii_file("/etc/mandrake-release", st) && | |
2008 !_print_ascii_file("/etc/sun-release", st) && | |
2009 !_print_ascii_file("/etc/redhat-release", st) && | |
2010 !_print_ascii_file("/etc/SuSE-release", st) && | |
2011 !_print_ascii_file("/etc/turbolinux-release", st) && | |
2012 !_print_ascii_file("/etc/gentoo-release", st) && | |
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2013 !_print_ascii_file("/etc/debian_version", st) && |
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2014 !_print_ascii_file("/etc/ltib-release", st) && |
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2015 !_print_ascii_file("/etc/angstrom-version", st)) { |
0 | 2016 st->print("Linux"); |
2017 } | |
2018 st->cr(); | |
2019 | |
2020 // kernel | |
2021 st->print("uname:"); | |
2022 struct utsname name; | |
2023 uname(&name); | |
2024 st->print(name.sysname); st->print(" "); | |
2025 st->print(name.release); st->print(" "); | |
2026 st->print(name.version); st->print(" "); | |
2027 st->print(name.machine); | |
2028 st->cr(); | |
2029 | |
2030 // Print warning if unsafe chroot environment detected | |
2031 if (unsafe_chroot_detected) { | |
2032 st->print("WARNING!! "); | |
2033 st->print_cr(unstable_chroot_error); | |
2034 } | |
2035 | |
2036 // libc, pthread | |
2037 st->print("libc:"); | |
2038 st->print(os::Linux::glibc_version()); st->print(" "); | |
2039 st->print(os::Linux::libpthread_version()); st->print(" "); | |
2040 if (os::Linux::is_LinuxThreads()) { | |
2041 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
2042 } | |
2043 st->cr(); | |
2044 | |
2045 // rlimit | |
2046 st->print("rlimit:"); | |
2047 struct rlimit rlim; | |
2048 | |
2049 st->print(" STACK "); | |
2050 getrlimit(RLIMIT_STACK, &rlim); | |
2051 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
2052 else st->print("%uk", rlim.rlim_cur >> 10); | |
2053 | |
2054 st->print(", CORE "); | |
2055 getrlimit(RLIMIT_CORE, &rlim); | |
2056 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
2057 else st->print("%uk", rlim.rlim_cur >> 10); | |
2058 | |
2059 st->print(", NPROC "); | |
2060 getrlimit(RLIMIT_NPROC, &rlim); | |
2061 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
2062 else st->print("%d", rlim.rlim_cur); | |
2063 | |
2064 st->print(", NOFILE "); | |
2065 getrlimit(RLIMIT_NOFILE, &rlim); | |
2066 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
2067 else st->print("%d", rlim.rlim_cur); | |
2068 | |
2069 st->print(", AS "); | |
2070 getrlimit(RLIMIT_AS, &rlim); | |
2071 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
2072 else st->print("%uk", rlim.rlim_cur >> 10); | |
2073 st->cr(); | |
2074 | |
2075 // load average | |
2076 st->print("load average:"); | |
2077 double loadavg[3]; | |
2078 os::loadavg(loadavg, 3); | |
2079 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); | |
2080 st->cr(); | |
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2081 |
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2082 // meminfo |
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2083 st->print("\n/proc/meminfo:\n"); |
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2084 _print_ascii_file("/proc/meminfo", st); |
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2085 st->cr(); |
0 | 2086 } |
2087 | |
2088 void os::print_memory_info(outputStream* st) { | |
2089 | |
2090 st->print("Memory:"); | |
2091 st->print(" %dk page", os::vm_page_size()>>10); | |
2092 | |
2093 // values in struct sysinfo are "unsigned long" | |
2094 struct sysinfo si; | |
2095 sysinfo(&si); | |
2096 | |
2097 st->print(", physical " UINT64_FORMAT "k", | |
2098 os::physical_memory() >> 10); | |
2099 st->print("(" UINT64_FORMAT "k free)", | |
2100 os::available_memory() >> 10); | |
2101 st->print(", swap " UINT64_FORMAT "k", | |
2102 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
2103 st->print("(" UINT64_FORMAT "k free)", | |
2104 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
2105 st->cr(); | |
2106 } | |
2107 | |
2108 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
2109 // but they're the same for all the linux arch that we support | |
2110 // and they're the same for solaris but there's no common place to put this. | |
2111 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
2112 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
2113 "ILL_COPROC", "ILL_BADSTK" }; | |
2114 | |
2115 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
2116 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
2117 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
2118 | |
2119 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
2120 | |
2121 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
2122 | |
2123 void os::print_siginfo(outputStream* st, void* siginfo) { | |
2124 st->print("siginfo:"); | |
2125 | |
2126 const int buflen = 100; | |
2127 char buf[buflen]; | |
2128 siginfo_t *si = (siginfo_t*)siginfo; | |
2129 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
2130 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
2131 st->print("si_errno=%s", buf); | |
2132 } else { | |
2133 st->print("si_errno=%d", si->si_errno); | |
2134 } | |
2135 const int c = si->si_code; | |
2136 assert(c > 0, "unexpected si_code"); | |
2137 switch (si->si_signo) { | |
2138 case SIGILL: | |
2139 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
2140 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2141 break; | |
2142 case SIGFPE: | |
2143 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
2144 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2145 break; | |
2146 case SIGSEGV: | |
2147 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
2148 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2149 break; | |
2150 case SIGBUS: | |
2151 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
2152 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2153 break; | |
2154 default: | |
2155 st->print(", si_code=%d", si->si_code); | |
2156 // no si_addr | |
2157 } | |
2158 | |
2159 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
2160 UseSharedSpaces) { | |
2161 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
2162 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
2163 st->print("\n\nError accessing class data sharing archive." \ | |
2164 " Mapped file inaccessible during execution, " \ | |
2165 " possible disk/network problem."); | |
2166 } | |
2167 } | |
2168 st->cr(); | |
2169 } | |
2170 | |
2171 | |
2172 static void print_signal_handler(outputStream* st, int sig, | |
2173 char* buf, size_t buflen); | |
2174 | |
2175 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
2176 st->print_cr("Signal Handlers:"); | |
2177 print_signal_handler(st, SIGSEGV, buf, buflen); | |
2178 print_signal_handler(st, SIGBUS , buf, buflen); | |
2179 print_signal_handler(st, SIGFPE , buf, buflen); | |
2180 print_signal_handler(st, SIGPIPE, buf, buflen); | |
2181 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
2182 print_signal_handler(st, SIGILL , buf, buflen); | |
2183 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
2184 print_signal_handler(st, SR_signum, buf, buflen); | |
2185 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
2186 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
2187 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
2188 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
2189 } | |
2190 | |
2191 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
2192 | |
2193 // Find the full path to the current module, libjvm.so or libjvm_g.so | |
1642 | 2194 void os::jvm_path(char *buf, jint buflen) { |
0 | 2195 // Error checking. |
1642 | 2196 if (buflen < MAXPATHLEN) { |
0 | 2197 assert(false, "must use a large-enough buffer"); |
2198 buf[0] = '\0'; | |
2199 return; | |
2200 } | |
2201 // Lazy resolve the path to current module. | |
2202 if (saved_jvm_path[0] != 0) { | |
2203 strcpy(buf, saved_jvm_path); | |
2204 return; | |
2205 } | |
2206 | |
2207 char dli_fname[MAXPATHLEN]; | |
2208 bool ret = dll_address_to_library_name( | |
2209 CAST_FROM_FN_PTR(address, os::jvm_path), | |
2210 dli_fname, sizeof(dli_fname), NULL); | |
2211 assert(ret != 0, "cannot locate libjvm"); | |
1681
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2212 char *rp = realpath(dli_fname, buf); |
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2213 if (rp == NULL) |
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2214 return; |
0 | 2215 |
2216 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) { | |
2217 // Support for the gamma launcher. Typical value for buf is | |
2218 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
2219 // the right place in the string, then assume we are installed in a JDK and | |
2220 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
2221 // up the path so it looks like libjvm.so is installed there (append a | |
2222 // fake suffix hotspot/libjvm.so). | |
2223 const char *p = buf + strlen(buf) - 1; | |
2224 for (int count = 0; p > buf && count < 5; ++count) { | |
2225 for (--p; p > buf && *p != '/'; --p) | |
2226 /* empty */ ; | |
2227 } | |
2228 | |
2229 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
2230 // Look for JAVA_HOME in the environment. | |
2231 char* java_home_var = ::getenv("JAVA_HOME"); | |
2232 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1642 | 2233 char* jrelib_p; |
2234 int len; | |
2235 | |
0 | 2236 // Check the current module name "libjvm.so" or "libjvm_g.so". |
2237 p = strrchr(buf, '/'); | |
2238 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
2239 p = strstr(p, "_g") ? "_g" : ""; | |
2240 | |
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2241 rp = realpath(java_home_var, buf); |
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2242 if (rp == NULL) |
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2243 return; |
1642 | 2244 |
2245 // determine if this is a legacy image or modules image | |
2246 // modules image doesn't have "jre" subdirectory | |
2247 len = strlen(buf); | |
2248 jrelib_p = buf + len; | |
2249 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
2250 if (0 != access(buf, F_OK)) { | |
2251 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
2252 } | |
2253 | |
0 | 2254 if (0 == access(buf, F_OK)) { |
2255 // Use current module name "libjvm[_g].so" instead of | |
2256 // "libjvm"debug_only("_g")".so" since for fastdebug version | |
2257 // we should have "libjvm.so" but debug_only("_g") adds "_g"! | |
1642 | 2258 len = strlen(buf); |
2259 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p); | |
0 | 2260 } else { |
2261 // Go back to path of .so | |
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2262 rp = realpath(dli_fname, buf); |
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2263 if (rp == NULL) |
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2264 return; |
0 | 2265 } |
2266 } | |
2267 } | |
2268 } | |
2269 | |
2270 strcpy(saved_jvm_path, buf); | |
2271 } | |
2272 | |
2273 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
2274 // no prefix required, not even "_" | |
2275 } | |
2276 | |
2277 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
2278 // no suffix required | |
2279 } | |
2280 | |
2281 //////////////////////////////////////////////////////////////////////////////// | |
2282 // sun.misc.Signal support | |
2283 | |
2284 static volatile jint sigint_count = 0; | |
2285 | |
2286 static void | |
2287 UserHandler(int sig, void *siginfo, void *context) { | |
2288 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
2289 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
2290 // don't want to flood the manager thread with sem_post requests. | |
2291 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
2292 return; | |
2293 | |
2294 // Ctrl-C is pressed during error reporting, likely because the error | |
2295 // handler fails to abort. Let VM die immediately. | |
2296 if (sig == SIGINT && is_error_reported()) { | |
2297 os::die(); | |
2298 } | |
2299 | |
2300 os::signal_notify(sig); | |
2301 } | |
2302 | |
2303 void* os::user_handler() { | |
2304 return CAST_FROM_FN_PTR(void*, UserHandler); | |
2305 } | |
2306 | |
2307 extern "C" { | |
2308 typedef void (*sa_handler_t)(int); | |
2309 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
2310 } | |
2311 | |
2312 void* os::signal(int signal_number, void* handler) { | |
2313 struct sigaction sigAct, oldSigAct; | |
2314 | |
2315 sigfillset(&(sigAct.sa_mask)); | |
2316 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
2317 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
2318 | |
2319 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
2320 // -1 means registration failed | |
2321 return (void *)-1; | |
2322 } | |
2323 | |
2324 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
2325 } | |
2326 | |
2327 void os::signal_raise(int signal_number) { | |
2328 ::raise(signal_number); | |
2329 } | |
2330 | |
2331 /* | |
2332 * The following code is moved from os.cpp for making this | |
2333 * code platform specific, which it is by its very nature. | |
2334 */ | |
2335 | |
2336 // Will be modified when max signal is changed to be dynamic | |
2337 int os::sigexitnum_pd() { | |
2338 return NSIG; | |
2339 } | |
2340 | |
2341 // a counter for each possible signal value | |
2342 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
2343 | |
2344 // Linux(POSIX) specific hand shaking semaphore. | |
2345 static sem_t sig_sem; | |
2346 | |
2347 void os::signal_init_pd() { | |
2348 // Initialize signal structures | |
2349 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2350 | |
2351 // Initialize signal semaphore | |
2352 ::sem_init(&sig_sem, 0, 0); | |
2353 } | |
2354 | |
2355 void os::signal_notify(int sig) { | |
2356 Atomic::inc(&pending_signals[sig]); | |
2357 ::sem_post(&sig_sem); | |
2358 } | |
2359 | |
2360 static int check_pending_signals(bool wait) { | |
2361 Atomic::store(0, &sigint_count); | |
2362 for (;;) { | |
2363 for (int i = 0; i < NSIG + 1; i++) { | |
2364 jint n = pending_signals[i]; | |
2365 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2366 return i; | |
2367 } | |
2368 } | |
2369 if (!wait) { | |
2370 return -1; | |
2371 } | |
2372 JavaThread *thread = JavaThread::current(); | |
2373 ThreadBlockInVM tbivm(thread); | |
2374 | |
2375 bool threadIsSuspended; | |
2376 do { | |
2377 thread->set_suspend_equivalent(); | |
2378 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2379 ::sem_wait(&sig_sem); | |
2380 | |
2381 // were we externally suspended while we were waiting? | |
2382 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2383 if (threadIsSuspended) { | |
2384 // | |
2385 // The semaphore has been incremented, but while we were waiting | |
2386 // another thread suspended us. We don't want to continue running | |
2387 // while suspended because that would surprise the thread that | |
2388 // suspended us. | |
2389 // | |
2390 ::sem_post(&sig_sem); | |
2391 | |
2392 thread->java_suspend_self(); | |
2393 } | |
2394 } while (threadIsSuspended); | |
2395 } | |
2396 } | |
2397 | |
2398 int os::signal_lookup() { | |
2399 return check_pending_signals(false); | |
2400 } | |
2401 | |
2402 int os::signal_wait() { | |
2403 return check_pending_signals(true); | |
2404 } | |
2405 | |
2406 //////////////////////////////////////////////////////////////////////////////// | |
2407 // Virtual Memory | |
2408 | |
2409 int os::vm_page_size() { | |
2410 // Seems redundant as all get out | |
2411 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2412 return os::Linux::page_size(); | |
2413 } | |
2414 | |
2415 // Solaris allocates memory by pages. | |
2416 int os::vm_allocation_granularity() { | |
2417 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2418 return os::Linux::page_size(); | |
2419 } | |
2420 | |
2421 // Rationale behind this function: | |
2422 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2423 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2424 // samples for JITted code. Here we create private executable mapping over the code cache | |
2425 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2426 // info for the reporting script by storing timestamp and location of symbol | |
2427 void linux_wrap_code(char* base, size_t size) { | |
2428 static volatile jint cnt = 0; | |
2429 | |
2430 if (!UseOprofile) { | |
2431 return; | |
2432 } | |
2433 | |
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2434 char buf[PATH_MAX+1]; |
0 | 2435 int num = Atomic::add(1, &cnt); |
2436 | |
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2437 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
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2438 os::get_temp_directory(), os::current_process_id(), num); |
0 | 2439 unlink(buf); |
2440 | |
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|
2441 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
0 | 2442 |
2443 if (fd != -1) { | |
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|
2444 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
0 | 2445 if (rv != (off_t)-1) { |
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2446 if (::write(fd, "", 1) == 1) { |
0 | 2447 mmap(base, size, |
2448 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2449 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2450 } | |
2451 } | |
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|
2452 ::close(fd); |
0 | 2453 unlink(buf); |
2454 } | |
2455 } | |
2456 | |
2457 // NOTE: Linux kernel does not really reserve the pages for us. | |
2458 // All it does is to check if there are enough free pages | |
2459 // left at the time of mmap(). This could be a potential | |
2460 // problem. | |
656 | 2461 bool os::commit_memory(char* addr, size_t size, bool exec) { |
2462 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; | |
2463 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
0 | 2464 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
2465 return res != (uintptr_t) MAP_FAILED; | |
2466 } | |
2467 | |
656 | 2468 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, |
2469 bool exec) { | |
2470 return commit_memory(addr, size, exec); | |
0 | 2471 } |
2472 | |
2473 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } | |
141 | 2474 |
2475 void os::free_memory(char *addr, size_t bytes) { | |
761
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|
2476 ::mmap(addr, bytes, PROT_READ | PROT_WRITE, |
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2477 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
141 | 2478 } |
2479 | |
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2480 void os::numa_make_global(char *addr, size_t bytes) { |
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2481 Linux::numa_interleave_memory(addr, bytes); |
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|
2482 } |
141 | 2483 |
2484 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2485 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); | |
2486 } | |
2487 | |
2488 bool os::numa_topology_changed() { return false; } | |
2489 | |
2490 size_t os::numa_get_groups_num() { | |
2491 int max_node = Linux::numa_max_node(); | |
2492 return max_node > 0 ? max_node + 1 : 1; | |
2493 } | |
2494 | |
2495 int os::numa_get_group_id() { | |
2496 int cpu_id = Linux::sched_getcpu(); | |
2497 if (cpu_id != -1) { | |
2498 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
2499 if (lgrp_id != -1) { | |
2500 return lgrp_id; | |
2501 } | |
0 | 2502 } |
2503 return 0; | |
2504 } | |
2505 | |
141 | 2506 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
2507 for (size_t i = 0; i < size; i++) { | |
2508 ids[i] = i; | |
2509 } | |
2510 return size; | |
2511 } | |
2512 | |
0 | 2513 bool os::get_page_info(char *start, page_info* info) { |
2514 return false; | |
2515 } | |
2516 | |
2517 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2518 return end; | |
2519 } | |
2520 | |
2191 | 2521 // Something to do with the numa-aware allocator needs these symbols |
2522 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
2523 extern "C" JNIEXPORT void numa_error(char *where) { } | |
2524 extern "C" JNIEXPORT int fork1() { return fork(); } | |
141 | 2525 |
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2526 |
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2527 // If we are running with libnuma version > 2, then we should |
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2528 // be trying to use symbols with versions 1.1 |
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2529 // If we are running with earlier version, which did not have symbol versions, |
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2530 // we should use the base version. |
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|
2531 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
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2532 void *f = dlvsym(handle, name, "libnuma_1.1"); |
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2533 if (f == NULL) { |
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|
2534 f = dlsym(handle, name); |
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|
2535 } |
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|
2536 return f; |
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|
2537 } |
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2538 |
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|
2539 bool os::Linux::libnuma_init() { |
141 | 2540 // sched_getcpu() should be in libc. |
2541 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
2542 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
2543 | |
2544 if (sched_getcpu() != -1) { // Does it work? | |
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|
2545 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
141 | 2546 if (handle != NULL) { |
2547 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
763
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|
2548 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
141 | 2549 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
763
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|
2550 libnuma_dlsym(handle, "numa_max_node"))); |
141 | 2551 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
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|
2552 libnuma_dlsym(handle, "numa_available"))); |
141 | 2553 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
763
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|
2554 libnuma_dlsym(handle, "numa_tonode_memory"))); |
462
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|
2555 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
763
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|
2556 libnuma_dlsym(handle, "numa_interleave_memory"))); |
462
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2557 |
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2558 |
141 | 2559 if (numa_available() != -1) { |
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|
2560 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
141 | 2561 // Create a cpu -> node mapping |
2562 _cpu_to_node = new (ResourceObj::C_HEAP) GrowableArray<int>(0, true); | |
2563 rebuild_cpu_to_node_map(); | |
462
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2564 return true; |
141 | 2565 } |
2566 } | |
2567 } | |
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2568 return false; |
141 | 2569 } |
2570 | |
2571 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
2572 // The table is later used in get_node_by_cpu(). | |
2573 void os::Linux::rebuild_cpu_to_node_map() { | |
462
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2574 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
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2575 // in libnuma (possible values are starting from 16, |
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2576 // and continuing up with every other power of 2, but less |
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2577 // than the maximum number of CPUs supported by kernel), and |
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2578 // is a subject to change (in libnuma version 2 the requirements |
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2579 // are more reasonable) we'll just hardcode the number they use |
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2580 // in the library. |
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2581 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
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2582 |
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2583 size_t cpu_num = os::active_processor_count(); |
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2584 size_t cpu_map_size = NCPUS / BitsPerCLong; |
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2585 size_t cpu_map_valid_size = |
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2586 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
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2587 |
141 | 2588 cpu_to_node()->clear(); |
2589 cpu_to_node()->at_grow(cpu_num - 1); | |
462
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2590 size_t node_num = numa_get_groups_num(); |
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2591 |
141 | 2592 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size); |
462
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2593 for (size_t i = 0; i < node_num; i++) { |
141 | 2594 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
462
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2595 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
141 | 2596 if (cpu_map[j] != 0) { |
462
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2597 for (size_t k = 0; k < BitsPerCLong; k++) { |
141 | 2598 if (cpu_map[j] & (1UL << k)) { |
462
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2599 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
141 | 2600 } |
2601 } | |
2602 } | |
2603 } | |
2604 } | |
2605 } | |
2606 FREE_C_HEAP_ARRAY(unsigned long, cpu_map); | |
2607 } | |
2608 | |
2609 int os::Linux::get_node_by_cpu(int cpu_id) { | |
2610 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
2611 return cpu_to_node()->at(cpu_id); | |
2612 } | |
2613 return -1; | |
2614 } | |
2615 | |
2616 GrowableArray<int>* os::Linux::_cpu_to_node; | |
2617 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
2618 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
2619 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
2620 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
2621 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
462
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2622 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
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2623 unsigned long* os::Linux::_numa_all_nodes; |
141 | 2624 |
0 | 2625 bool os::uncommit_memory(char* addr, size_t size) { |
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2626 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
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2627 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
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2628 return res != (uintptr_t) MAP_FAILED; |
0 | 2629 } |
2630 | |
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2631 // Linux uses a growable mapping for the stack, and if the mapping for |
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2632 // the stack guard pages is not removed when we detach a thread the |
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2633 // stack cannot grow beyond the pages where the stack guard was |
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2634 // mapped. If at some point later in the process the stack expands to |
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2635 // that point, the Linux kernel cannot expand the stack any further |
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2636 // because the guard pages are in the way, and a segfault occurs. |
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2637 // |
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2638 // However, it's essential not to split the stack region by unmapping |
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2639 // a region (leaving a hole) that's already part of the stack mapping, |
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2640 // so if the stack mapping has already grown beyond the guard pages at |
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2641 // the time we create them, we have to truncate the stack mapping. |
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2642 // So, we need to know the extent of the stack mapping when |
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2643 // create_stack_guard_pages() is called. |
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2644 |
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2645 // Find the bounds of the stack mapping. Return true for success. |
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2646 // |
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2647 // We only need this for stacks that are growable: at the time of |
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2648 // writing thread stacks don't use growable mappings (i.e. those |
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2649 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
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2650 // only applies to the main thread. |
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2651 static bool |
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2652 get_stack_bounds(uintptr_t *bottom, uintptr_t *top) |
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2653 { |
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2654 FILE *f = fopen("/proc/self/maps", "r"); |
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2655 if (f == NULL) |
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2656 return false; |
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|
2657 |
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2658 while (!feof(f)) { |
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|
2659 size_t dummy; |
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2660 char *str = NULL; |
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2661 ssize_t len = getline(&str, &dummy, f); |
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2662 if (len == -1) { |
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2663 fclose(f); |
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2664 return false; |
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|
2665 } |
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2666 |
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2667 if (len > 0 && str[len-1] == '\n') { |
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2668 str[len-1] = 0; |
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2669 len--; |
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2670 } |
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2671 |
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2672 static const char *stack_str = "[stack]"; |
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2673 if (len > (ssize_t)strlen(stack_str) |
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2674 && (strcmp(str + len - strlen(stack_str), stack_str) == 0)) { |
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2675 if (sscanf(str, "%" SCNxPTR "-%" SCNxPTR, bottom, top) == 2) { |
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2676 uintptr_t sp = (uintptr_t)__builtin_frame_address(0); |
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2677 if (sp >= *bottom && sp <= *top) { |
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2678 free(str); |
1325
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2679 fclose(f); |
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2680 return true; |
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2681 } |
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2682 } |
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2683 } |
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2684 free(str); |
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2685 } |
1325
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2686 fclose(f); |
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2687 return false; |
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2688 } |
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2689 |
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2690 // If the (growable) stack mapping already extends beyond the point |
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2691 // where we're going to put our guard pages, truncate the mapping at |
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2692 // that point by munmap()ping it. This ensures that when we later |
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2693 // munmap() the guard pages we don't leave a hole in the stack |
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2694 // mapping. This only affects the main/initial thread, but guard |
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2695 // against future OS changes |
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2696 bool os::create_stack_guard_pages(char* addr, size_t size) { |
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2697 uintptr_t stack_extent, stack_base; |
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2698 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
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2699 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
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2700 assert(os::Linux::is_initial_thread(), |
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2701 "growable stack in non-initial thread"); |
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2702 if (stack_extent < (uintptr_t)addr) |
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2703 ::munmap((void*)stack_extent, (uintptr_t)addr - stack_extent); |
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2704 } |
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2705 |
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2706 return os::commit_memory(addr, size); |
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2707 } |
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2708 |
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2709 // If this is a growable mapping, remove the guard pages entirely by |
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2710 // munmap()ping them. If not, just call uncommit_memory(). This only |
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2711 // affects the main/initial thread, but guard against future OS changes |
1320
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2712 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
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2713 uintptr_t stack_extent, stack_base; |
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2714 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
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2715 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
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2716 assert(os::Linux::is_initial_thread(), |
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2717 "growable stack in non-initial thread"); |
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2718 |
1320
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2719 return ::munmap(addr, size) == 0; |
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2720 } |
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2721 |
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2722 return os::uncommit_memory(addr, size); |
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2723 } |
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2724 |
0 | 2725 static address _highest_vm_reserved_address = NULL; |
2726 | |
2727 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2728 // at 'requested_addr'. If there are existing memory mappings at the same | |
2729 // location, however, they will be overwritten. If 'fixed' is false, | |
2730 // 'requested_addr' is only treated as a hint, the return value may or | |
2731 // may not start from the requested address. Unlike Linux mmap(), this | |
2732 // function returns NULL to indicate failure. | |
2733 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2734 char * addr; | |
2735 int flags; | |
2736 | |
2737 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2738 if (fixed) { | |
2739 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
2740 flags |= MAP_FIXED; | |
2741 } | |
2742 | |
656 | 2743 // Map uncommitted pages PROT_READ and PROT_WRITE, change access |
2744 // to PROT_EXEC if executable when we commit the page. | |
2745 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, | |
0 | 2746 flags, -1, 0); |
2747 | |
2748 if (addr != MAP_FAILED) { | |
2749 // anon_mmap() should only get called during VM initialization, | |
2750 // don't need lock (actually we can skip locking even it can be called | |
2751 // from multiple threads, because _highest_vm_reserved_address is just a | |
2752 // hint about the upper limit of non-stack memory regions.) | |
2753 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2754 _highest_vm_reserved_address = (address)addr + bytes; | |
2755 } | |
2756 } | |
2757 | |
2758 return addr == MAP_FAILED ? NULL : addr; | |
2759 } | |
2760 | |
2761 // Don't update _highest_vm_reserved_address, because there might be memory | |
2762 // regions above addr + size. If so, releasing a memory region only creates | |
2763 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2764 // | |
2765 static int anon_munmap(char * addr, size_t size) { | |
2766 return ::munmap(addr, size) == 0; | |
2767 } | |
2768 | |
2769 char* os::reserve_memory(size_t bytes, char* requested_addr, | |
2770 size_t alignment_hint) { | |
2771 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2772 } | |
2773 | |
2774 bool os::release_memory(char* addr, size_t size) { | |
2775 return anon_munmap(addr, size); | |
2776 } | |
2777 | |
2778 static address highest_vm_reserved_address() { | |
2779 return _highest_vm_reserved_address; | |
2780 } | |
2781 | |
2782 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
2783 // Linux wants the mprotect address argument to be page aligned. | |
2784 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
2785 | |
2786 // According to SUSv3, mprotect() should only be used with mappings | |
2787 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2788 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2789 // protection of malloc'ed or statically allocated memory). Check the | |
2790 // caller if you hit this assert. | |
2791 assert(addr == bottom, "sanity check"); | |
2792 | |
2793 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
2794 return ::mprotect(bottom, size, prot) == 0; | |
2795 } | |
2796 | |
237
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2797 // Set protections specified |
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2798 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
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2799 bool is_committed) { |
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2800 unsigned int p = 0; |
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2801 switch (prot) { |
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2802 case MEM_PROT_NONE: p = PROT_NONE; break; |
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2803 case MEM_PROT_READ: p = PROT_READ; break; |
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2804 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
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2805 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; |
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2806 default: |
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2807 ShouldNotReachHere(); |
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2808 } |
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2809 // is_committed is unused. |
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2810 return linux_mprotect(addr, bytes, p); |
0 | 2811 } |
2812 | |
2813 bool os::guard_memory(char* addr, size_t size) { | |
2814 return linux_mprotect(addr, size, PROT_NONE); | |
2815 } | |
2816 | |
2817 bool os::unguard_memory(char* addr, size_t size) { | |
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2818 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
0 | 2819 } |
2820 | |
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2821 /* |
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2822 * Set the coredump_filter bits to include largepages in core dump (bit 6) |
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2823 * |
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2824 * From the coredump_filter documentation: |
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2825 * |
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2826 * - (bit 0) anonymous private memory |
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2827 * - (bit 1) anonymous shared memory |
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2828 * - (bit 2) file-backed private memory |
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2829 * - (bit 3) file-backed shared memory |
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2830 * - (bit 4) ELF header pages in file-backed private memory areas (it is |
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2831 * effective only if the bit 2 is cleared) |
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2832 * - (bit 5) hugetlb private memory |
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2833 * - (bit 6) hugetlb shared memory |
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2834 */ |
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2835 static void set_coredump_filter(void) { |
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2836 FILE *f; |
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2837 long cdm; |
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2838 |
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2839 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
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2840 return; |
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2841 } |
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2842 |
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2843 if (fscanf(f, "%lx", &cdm) != 1) { |
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2844 fclose(f); |
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2845 return; |
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2846 } |
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2847 |
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2848 rewind(f); |
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2849 |
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2850 if ((cdm & LARGEPAGES_BIT) == 0) { |
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2851 cdm |= LARGEPAGES_BIT; |
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2852 fprintf(f, "%#lx", cdm); |
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2853 } |
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2854 |
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2855 fclose(f); |
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2856 } |
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2857 |
0 | 2858 // Large page support |
2859 | |
2860 static size_t _large_page_size = 0; | |
2861 | |
2862 bool os::large_page_init() { | |
2863 if (!UseLargePages) return false; | |
2864 | |
2865 if (LargePageSizeInBytes) { | |
2866 _large_page_size = LargePageSizeInBytes; | |
2867 } else { | |
2868 // large_page_size on Linux is used to round up heap size. x86 uses either | |
2869 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) | |
2870 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use | |
2871 // page as large as 256M. | |
2872 // | |
2873 // Here we try to figure out page size by parsing /proc/meminfo and looking | |
2874 // for a line with the following format: | |
2875 // Hugepagesize: 2048 kB | |
2876 // | |
2877 // If we can't determine the value (e.g. /proc is not mounted, or the text | |
2878 // format has been changed), we'll use the largest page size supported by | |
2879 // the processor. | |
2880 | |
1010 | 2881 #ifndef ZERO |
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2882 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) |
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2883 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
1010 | 2884 #endif // ZERO |
0 | 2885 |
2886 FILE *fp = fopen("/proc/meminfo", "r"); | |
2887 if (fp) { | |
2888 while (!feof(fp)) { | |
2889 int x = 0; | |
2890 char buf[16]; | |
2891 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { | |
2892 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { | |
2893 _large_page_size = x * K; | |
2894 break; | |
2895 } | |
2896 } else { | |
2897 // skip to next line | |
2898 for (;;) { | |
2899 int ch = fgetc(fp); | |
2900 if (ch == EOF || ch == (int)'\n') break; | |
2901 } | |
2902 } | |
2903 } | |
2904 fclose(fp); | |
2905 } | |
2906 } | |
2907 | |
2908 const size_t default_page_size = (size_t)Linux::page_size(); | |
2909 if (_large_page_size > default_page_size) { | |
2910 _page_sizes[0] = _large_page_size; | |
2911 _page_sizes[1] = default_page_size; | |
2912 _page_sizes[2] = 0; | |
2913 } | |
2914 | |
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2915 set_coredump_filter(); |
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2916 |
0 | 2917 // Large page support is available on 2.6 or newer kernel, some vendors |
2918 // (e.g. Redhat) have backported it to their 2.4 based distributions. | |
2919 // We optimistically assume the support is available. If later it turns out | |
2920 // not true, VM will automatically switch to use regular page size. | |
2921 return true; | |
2922 } | |
2923 | |
2924 #ifndef SHM_HUGETLB | |
2925 #define SHM_HUGETLB 04000 | |
2926 #endif | |
2927 | |
656 | 2928 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { |
2929 // "exec" is passed in but not used. Creating the shared image for | |
2930 // the code cache doesn't have an SHM_X executable permission to check. | |
0 | 2931 assert(UseLargePages, "only for large pages"); |
2932 | |
2933 key_t key = IPC_PRIVATE; | |
2934 char *addr; | |
2935 | |
2936 bool warn_on_failure = UseLargePages && | |
2937 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2938 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2939 ); | |
2940 char msg[128]; | |
2941 | |
2942 // Create a large shared memory region to attach to based on size. | |
2943 // Currently, size is the total size of the heap | |
2944 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
2945 if (shmid == -1) { | |
2946 // Possible reasons for shmget failure: | |
2947 // 1. shmmax is too small for Java heap. | |
2948 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2949 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2950 // 2. not enough large page memory. | |
2951 // > check available large pages: cat /proc/meminfo | |
2952 // > increase amount of large pages: | |
2953 // echo new_value > /proc/sys/vm/nr_hugepages | |
2954 // Note 1: different Linux may use different name for this property, | |
2955 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2956 // Note 2: it's possible there's enough physical memory available but | |
2957 // they are so fragmented after a long run that they can't | |
2958 // coalesce into large pages. Try to reserve large pages when | |
2959 // the system is still "fresh". | |
2960 if (warn_on_failure) { | |
2961 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2962 warning(msg); | |
2963 } | |
2964 return NULL; | |
2965 } | |
2966 | |
2967 // attach to the region | |
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2968 addr = (char*)shmat(shmid, req_addr, 0); |
0 | 2969 int err = errno; |
2970 | |
2971 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2972 // will be deleted when it's detached by shmdt() or when the process | |
2973 // terminates. If shmat() is not successful this will remove the shared | |
2974 // segment immediately. | |
2975 shmctl(shmid, IPC_RMID, NULL); | |
2976 | |
2977 if ((intptr_t)addr == -1) { | |
2978 if (warn_on_failure) { | |
2979 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2980 warning(msg); | |
2981 } | |
2982 return NULL; | |
2983 } | |
2984 | |
2985 return addr; | |
2986 } | |
2987 | |
2988 bool os::release_memory_special(char* base, size_t bytes) { | |
2989 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
2990 int rslt = shmdt(base); | |
2991 return rslt == 0; | |
2992 } | |
2993 | |
2994 size_t os::large_page_size() { | |
2995 return _large_page_size; | |
2996 } | |
2997 | |
2998 // Linux does not support anonymous mmap with large page memory. The only way | |
2999 // to reserve large page memory without file backing is through SysV shared | |
3000 // memory API. The entire memory region is committed and pinned upfront. | |
3001 // Hopefully this will change in the future... | |
3002 bool os::can_commit_large_page_memory() { | |
3003 return false; | |
3004 } | |
3005 | |
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3006 bool os::can_execute_large_page_memory() { |
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
changeset
|
3007 return false; |
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
changeset
|
3008 } |
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
changeset
|
3009 |
0 | 3010 // Reserve memory at an arbitrary address, only if that area is |
3011 // available (and not reserved for something else). | |
3012 | |
3013 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { | |
3014 const int max_tries = 10; | |
3015 char* base[max_tries]; | |
3016 size_t size[max_tries]; | |
3017 const size_t gap = 0x000000; | |
3018 | |
3019 // Assert only that the size is a multiple of the page size, since | |
3020 // that's all that mmap requires, and since that's all we really know | |
3021 // about at this low abstraction level. If we need higher alignment, | |
3022 // we can either pass an alignment to this method or verify alignment | |
3023 // in one of the methods further up the call chain. See bug 5044738. | |
3024 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
3025 | |
3026 // Repeatedly allocate blocks until the block is allocated at the | |
3027 // right spot. Give up after max_tries. Note that reserve_memory() will | |
3028 // automatically update _highest_vm_reserved_address if the call is | |
3029 // successful. The variable tracks the highest memory address every reserved | |
3030 // by JVM. It is used to detect heap-stack collision if running with | |
3031 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
3032 // space than needed, it could confuse the collision detecting code. To | |
3033 // solve the problem, save current _highest_vm_reserved_address and | |
3034 // calculate the correct value before return. | |
3035 address old_highest = _highest_vm_reserved_address; | |
3036 | |
3037 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
3038 // if kernel honors the hint then we can return immediately. | |
3039 char * addr = anon_mmap(requested_addr, bytes, false); | |
3040 if (addr == requested_addr) { | |
3041 return requested_addr; | |
3042 } | |
3043 | |
3044 if (addr != NULL) { | |
3045 // mmap() is successful but it fails to reserve at the requested address | |
3046 anon_munmap(addr, bytes); | |
3047 } | |
3048 | |
3049 int i; | |
3050 for (i = 0; i < max_tries; ++i) { | |
3051 base[i] = reserve_memory(bytes); | |
3052 | |
3053 if (base[i] != NULL) { | |
3054 // Is this the block we wanted? | |
3055 if (base[i] == requested_addr) { | |
3056 size[i] = bytes; | |
3057 break; | |
3058 } | |
3059 | |
3060 // Does this overlap the block we wanted? Give back the overlapped | |
3061 // parts and try again. | |
3062 | |
3063 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
3064 if (top_overlap >= 0 && top_overlap < bytes) { | |
3065 unmap_memory(base[i], top_overlap); | |
3066 base[i] += top_overlap; | |
3067 size[i] = bytes - top_overlap; | |
3068 } else { | |
3069 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
3070 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
3071 unmap_memory(requested_addr, bottom_overlap); | |
3072 size[i] = bytes - bottom_overlap; | |
3073 } else { | |
3074 size[i] = bytes; | |
3075 } | |
3076 } | |
3077 } | |
3078 } | |
3079 | |
3080 // Give back the unused reserved pieces. | |
3081 | |
3082 for (int j = 0; j < i; ++j) { | |
3083 if (base[j] != NULL) { | |
3084 unmap_memory(base[j], size[j]); | |
3085 } | |
3086 } | |
3087 | |
3088 if (i < max_tries) { | |
3089 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
3090 return requested_addr; | |
3091 } else { | |
3092 _highest_vm_reserved_address = old_highest; | |
3093 return NULL; | |
3094 } | |
3095 } | |
3096 | |
3097 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
3098 return ::read(fd, buf, nBytes); | |
3099 } | |
3100 | |
3101 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
3102 // Solaris uses poll(), linux uses park(). | |
3103 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
3104 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
3105 // SIGSEGV, see 4355769. | |
3106 | |
3107 const int NANOSECS_PER_MILLISECS = 1000000; | |
3108 | |
3109 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
3110 assert(thread == Thread::current(), "thread consistency check"); | |
3111 | |
3112 ParkEvent * const slp = thread->_SleepEvent ; | |
3113 slp->reset() ; | |
3114 OrderAccess::fence() ; | |
3115 | |
3116 if (interruptible) { | |
3117 jlong prevtime = javaTimeNanos(); | |
3118 | |
3119 for (;;) { | |
3120 if (os::is_interrupted(thread, true)) { | |
3121 return OS_INTRPT; | |
3122 } | |
3123 | |
3124 jlong newtime = javaTimeNanos(); | |
3125 | |
3126 if (newtime - prevtime < 0) { | |
3127 // time moving backwards, should only happen if no monotonic clock | |
3128 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3129 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3130 } else { | |
3131 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; | |
3132 } | |
3133 | |
3134 if(millis <= 0) { | |
3135 return OS_OK; | |
3136 } | |
3137 | |
3138 prevtime = newtime; | |
3139 | |
3140 { | |
3141 assert(thread->is_Java_thread(), "sanity check"); | |
3142 JavaThread *jt = (JavaThread *) thread; | |
3143 ThreadBlockInVM tbivm(jt); | |
3144 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
3145 | |
3146 jt->set_suspend_equivalent(); | |
3147 // cleared by handle_special_suspend_equivalent_condition() or | |
3148 // java_suspend_self() via check_and_wait_while_suspended() | |
3149 | |
3150 slp->park(millis); | |
3151 | |
3152 // were we externally suspended while we were waiting? | |
3153 jt->check_and_wait_while_suspended(); | |
3154 } | |
3155 } | |
3156 } else { | |
3157 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
3158 jlong prevtime = javaTimeNanos(); | |
3159 | |
3160 for (;;) { | |
3161 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
3162 // the 1st iteration ... | |
3163 jlong newtime = javaTimeNanos(); | |
3164 | |
3165 if (newtime - prevtime < 0) { | |
3166 // time moving backwards, should only happen if no monotonic clock | |
3167 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3168 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3169 } else { | |
3170 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS; | |
3171 } | |
3172 | |
3173 if(millis <= 0) break ; | |
3174 | |
3175 prevtime = newtime; | |
3176 slp->park(millis); | |
3177 } | |
3178 return OS_OK ; | |
3179 } | |
3180 } | |
3181 | |
3182 int os::naked_sleep() { | |
3183 // %% make the sleep time an integer flag. for now use 1 millisec. | |
3184 return os::sleep(Thread::current(), 1, false); | |
3185 } | |
3186 | |
3187 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
3188 void os::infinite_sleep() { | |
3189 while (true) { // sleep forever ... | |
3190 ::sleep(100); // ... 100 seconds at a time | |
3191 } | |
3192 } | |
3193 | |
3194 // Used to convert frequent JVM_Yield() to nops | |
3195 bool os::dont_yield() { | |
3196 return DontYieldALot; | |
3197 } | |
3198 | |
3199 void os::yield() { | |
3200 sched_yield(); | |
3201 } | |
3202 | |
3203 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
3204 | |
3205 void os::yield_all(int attempts) { | |
3206 // Yields to all threads, including threads with lower priorities | |
3207 // Threads on Linux are all with same priority. The Solaris style | |
3208 // os::yield_all() with nanosleep(1ms) is not necessary. | |
3209 sched_yield(); | |
3210 } | |
3211 | |
3212 // Called from the tight loops to possibly influence time-sharing heuristics | |
3213 void os::loop_breaker(int attempts) { | |
3214 os::yield_all(attempts); | |
3215 } | |
3216 | |
3217 //////////////////////////////////////////////////////////////////////////////// | |
3218 // thread priority support | |
3219 | |
3220 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
3221 // only supports dynamic priority, static priority must be zero. For real-time | |
3222 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
3223 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
3224 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
3225 // of 5 runs - Sep 2005). | |
3226 // | |
3227 // The following code actually changes the niceness of kernel-thread/LWP. It | |
3228 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
3229 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
3230 // threads. It has always been the case, but could change in the future. For | |
3231 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
3232 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
3233 | |
3234 int os::java_to_os_priority[MaxPriority + 1] = { | |
3235 19, // 0 Entry should never be used | |
3236 | |
3237 4, // 1 MinPriority | |
3238 3, // 2 | |
3239 2, // 3 | |
3240 | |
3241 1, // 4 | |
3242 0, // 5 NormPriority | |
3243 -1, // 6 | |
3244 | |
3245 -2, // 7 | |
3246 -3, // 8 | |
3247 -4, // 9 NearMaxPriority | |
3248 | |
3249 -5 // 10 MaxPriority | |
3250 }; | |
3251 | |
3252 static int prio_init() { | |
3253 if (ThreadPriorityPolicy == 1) { | |
3254 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
3255 // if effective uid is not root. Perhaps, a more elegant way of doing | |
3256 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
3257 if (geteuid() != 0) { | |
3258 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
3259 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
3260 } | |
3261 ThreadPriorityPolicy = 0; | |
3262 } | |
3263 } | |
3264 return 0; | |
3265 } | |
3266 | |
3267 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
3268 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
3269 | |
3270 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
3271 return (ret == 0) ? OS_OK : OS_ERR; | |
3272 } | |
3273 | |
3274 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
3275 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
3276 *priority_ptr = java_to_os_priority[NormPriority]; | |
3277 return OS_OK; | |
3278 } | |
3279 | |
3280 errno = 0; | |
3281 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
3282 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
3283 } | |
3284 | |
3285 // Hint to the underlying OS that a task switch would not be good. | |
3286 // Void return because it's a hint and can fail. | |
3287 void os::hint_no_preempt() {} | |
3288 | |
3289 //////////////////////////////////////////////////////////////////////////////// | |
3290 // suspend/resume support | |
3291 | |
3292 // the low-level signal-based suspend/resume support is a remnant from the | |
3293 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
3294 // within hotspot. Now there is a single use-case for this: | |
3295 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
3296 // that runs in the watcher thread. | |
3297 // The remaining code is greatly simplified from the more general suspension | |
3298 // code that used to be used. | |
3299 // | |
3300 // The protocol is quite simple: | |
3301 // - suspend: | |
3302 // - sends a signal to the target thread | |
3303 // - polls the suspend state of the osthread using a yield loop | |
3304 // - target thread signal handler (SR_handler) sets suspend state | |
3305 // and blocks in sigsuspend until continued | |
3306 // - resume: | |
3307 // - sets target osthread state to continue | |
3308 // - sends signal to end the sigsuspend loop in the SR_handler | |
3309 // | |
3310 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
3311 // | |
3312 | |
3313 static void resume_clear_context(OSThread *osthread) { | |
3314 osthread->set_ucontext(NULL); | |
3315 osthread->set_siginfo(NULL); | |
3316 | |
3317 // notify the suspend action is completed, we have now resumed | |
3318 osthread->sr.clear_suspended(); | |
3319 } | |
3320 | |
3321 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
3322 osthread->set_ucontext(context); | |
3323 osthread->set_siginfo(siginfo); | |
3324 } | |
3325 | |
3326 // | |
3327 // Handler function invoked when a thread's execution is suspended or | |
3328 // resumed. We have to be careful that only async-safe functions are | |
3329 // called here (Note: most pthread functions are not async safe and | |
3330 // should be avoided.) | |
3331 // | |
3332 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
3333 // interface point of view, but sigwait() prevents the signal hander | |
3334 // from being run. libpthread would get very confused by not having | |
3335 // its signal handlers run and prevents sigwait()'s use with the | |
3336 // mutex granting granting signal. | |
3337 // | |
3338 // Currently only ever called on the VMThread | |
3339 // | |
3340 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
3341 // Save and restore errno to avoid confusing native code with EINTR | |
3342 // after sigsuspend. | |
3343 int old_errno = errno; | |
3344 | |
3345 Thread* thread = Thread::current(); | |
3346 OSThread* osthread = thread->osthread(); | |
3347 assert(thread->is_VM_thread(), "Must be VMThread"); | |
3348 // read current suspend action | |
3349 int action = osthread->sr.suspend_action(); | |
3350 if (action == SR_SUSPEND) { | |
3351 suspend_save_context(osthread, siginfo, context); | |
3352 | |
3353 // Notify the suspend action is about to be completed. do_suspend() | |
3354 // waits until SR_SUSPENDED is set and then returns. We will wait | |
3355 // here for a resume signal and that completes the suspend-other | |
3356 // action. do_suspend/do_resume is always called as a pair from | |
3357 // the same thread - so there are no races | |
3358 | |
3359 // notify the caller | |
3360 osthread->sr.set_suspended(); | |
3361 | |
3362 sigset_t suspend_set; // signals for sigsuspend() | |
3363 | |
3364 // get current set of blocked signals and unblock resume signal | |
3365 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
3366 sigdelset(&suspend_set, SR_signum); | |
3367 | |
3368 // wait here until we are resumed | |
3369 do { | |
3370 sigsuspend(&suspend_set); | |
3371 // ignore all returns until we get a resume signal | |
3372 } while (osthread->sr.suspend_action() != SR_CONTINUE); | |
3373 | |
3374 resume_clear_context(osthread); | |
3375 | |
3376 } else { | |
3377 assert(action == SR_CONTINUE, "unexpected sr action"); | |
3378 // nothing special to do - just leave the handler | |
3379 } | |
3380 | |
3381 errno = old_errno; | |
3382 } | |
3383 | |
3384 | |
3385 static int SR_initialize() { | |
3386 struct sigaction act; | |
3387 char *s; | |
3388 /* Get signal number to use for suspend/resume */ | |
3389 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
3390 int sig = ::strtol(s, 0, 10); | |
3391 if (sig > 0 || sig < _NSIG) { | |
3392 SR_signum = sig; | |
3393 } | |
3394 } | |
3395 | |
3396 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
3397 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
3398 | |
3399 sigemptyset(&SR_sigset); | |
3400 sigaddset(&SR_sigset, SR_signum); | |
3401 | |
3402 /* Set up signal handler for suspend/resume */ | |
3403 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
3404 act.sa_handler = (void (*)(int)) SR_handler; | |
3405 | |
3406 // SR_signum is blocked by default. | |
3407 // 4528190 - We also need to block pthread restart signal (32 on all | |
3408 // supported Linux platforms). Note that LinuxThreads need to block | |
3409 // this signal for all threads to work properly. So we don't have | |
3410 // to use hard-coded signal number when setting up the mask. | |
3411 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
3412 | |
3413 if (sigaction(SR_signum, &act, 0) == -1) { | |
3414 return -1; | |
3415 } | |
3416 | |
3417 // Save signal flag | |
3418 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
3419 return 0; | |
3420 } | |
3421 | |
3422 static int SR_finalize() { | |
3423 return 0; | |
3424 } | |
3425 | |
3426 | |
3427 // returns true on success and false on error - really an error is fatal | |
3428 // but this seems the normal response to library errors | |
3429 static bool do_suspend(OSThread* osthread) { | |
3430 // mark as suspended and send signal | |
3431 osthread->sr.set_suspend_action(SR_SUSPEND); | |
3432 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
3433 assert_status(status == 0, status, "pthread_kill"); | |
3434 | |
3435 // check status and wait until notified of suspension | |
3436 if (status == 0) { | |
3437 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
3438 os::yield_all(i); | |
3439 } | |
3440 osthread->sr.set_suspend_action(SR_NONE); | |
3441 return true; | |
3442 } | |
3443 else { | |
3444 osthread->sr.set_suspend_action(SR_NONE); | |
3445 return false; | |
3446 } | |
3447 } | |
3448 | |
3449 static void do_resume(OSThread* osthread) { | |
3450 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
3451 osthread->sr.set_suspend_action(SR_CONTINUE); | |
3452 | |
3453 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
3454 assert_status(status == 0, status, "pthread_kill"); | |
3455 // check status and wait unit notified of resumption | |
3456 if (status == 0) { | |
3457 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
3458 os::yield_all(i); | |
3459 } | |
3460 } | |
3461 osthread->sr.set_suspend_action(SR_NONE); | |
3462 } | |
3463 | |
3464 //////////////////////////////////////////////////////////////////////////////// | |
3465 // interrupt support | |
3466 | |
3467 void os::interrupt(Thread* thread) { | |
3468 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3469 "possibility of dangling Thread pointer"); | |
3470 | |
3471 OSThread* osthread = thread->osthread(); | |
3472 | |
3473 if (!osthread->interrupted()) { | |
3474 osthread->set_interrupted(true); | |
3475 // More than one thread can get here with the same value of osthread, | |
3476 // resulting in multiple notifications. We do, however, want the store | |
3477 // to interrupted() to be visible to other threads before we execute unpark(). | |
3478 OrderAccess::fence(); | |
3479 ParkEvent * const slp = thread->_SleepEvent ; | |
3480 if (slp != NULL) slp->unpark() ; | |
3481 } | |
3482 | |
3483 // For JSR166. Unpark even if interrupt status already was set | |
3484 if (thread->is_Java_thread()) | |
3485 ((JavaThread*)thread)->parker()->unpark(); | |
3486 | |
3487 ParkEvent * ev = thread->_ParkEvent ; | |
3488 if (ev != NULL) ev->unpark() ; | |
3489 | |
3490 } | |
3491 | |
3492 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3493 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3494 "possibility of dangling Thread pointer"); | |
3495 | |
3496 OSThread* osthread = thread->osthread(); | |
3497 | |
3498 bool interrupted = osthread->interrupted(); | |
3499 | |
3500 if (interrupted && clear_interrupted) { | |
3501 osthread->set_interrupted(false); | |
3502 // consider thread->_SleepEvent->reset() ... optional optimization | |
3503 } | |
3504 | |
3505 return interrupted; | |
3506 } | |
3507 | |
3508 /////////////////////////////////////////////////////////////////////////////////// | |
3509 // signal handling (except suspend/resume) | |
3510 | |
3511 // This routine may be used by user applications as a "hook" to catch signals. | |
3512 // The user-defined signal handler must pass unrecognized signals to this | |
3513 // routine, and if it returns true (non-zero), then the signal handler must | |
3514 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3515 // routine will never retun false (zero), but instead will execute a VM panic | |
3516 // routine kill the process. | |
3517 // | |
3518 // If this routine returns false, it is OK to call it again. This allows | |
3519 // the user-defined signal handler to perform checks either before or after | |
3520 // the VM performs its own checks. Naturally, the user code would be making | |
3521 // a serious error if it tried to handle an exception (such as a null check | |
3522 // or breakpoint) that the VM was generating for its own correct operation. | |
3523 // | |
3524 // This routine may recognize any of the following kinds of signals: | |
3525 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3526 // It should be consulted by handlers for any of those signals. | |
3527 // | |
3528 // The caller of this routine must pass in the three arguments supplied | |
3529 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3530 // field of the structure passed to sigaction(). This routine assumes that | |
3531 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3532 // | |
3533 // Note that the VM will print warnings if it detects conflicting signal | |
3534 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3535 // | |
2191 | 3536 extern "C" JNIEXPORT int |
0 | 3537 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
3538 void* ucontext, int abort_if_unrecognized); | |
3539 | |
3540 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3541 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
1942
00bc9eaf0e24
Support for -XX:+UseFastLocking flag. Fixed monitor enter XIR template for correct debug info at the runtime call.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1936
diff
changeset
|
3542 ResourceMark rm; |
1936
8d88c9ac9247
Correct deopt handler entry. New flag -XX:+TraceSignals. More detailed deopt printing.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1867
diff
changeset
|
3543 if (TraceSignals) { |
8d88c9ac9247
Correct deopt handler entry. New flag -XX:+TraceSignals. More detailed deopt printing.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1867
diff
changeset
|
3544 tty->print_cr(err_msg("signal received: code=%d errno=%d signo=%d thread=%s address=%x", info->si_code, info->si_errno, info->si_signo, Thread::current()->name(), info->si_addr)); |
8d88c9ac9247
Correct deopt handler entry. New flag -XX:+TraceSignals. More detailed deopt printing.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1867
diff
changeset
|
3545 } |
0 | 3546 JVM_handle_linux_signal(sig, info, uc, true); |
1936
8d88c9ac9247
Correct deopt handler entry. New flag -XX:+TraceSignals. More detailed deopt printing.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1867
diff
changeset
|
3547 if (TraceSignals) { |
8d88c9ac9247
Correct deopt handler entry. New flag -XX:+TraceSignals. More detailed deopt printing.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1867
diff
changeset
|
3548 tty->print_cr("signal handled"); |
8d88c9ac9247
Correct deopt handler entry. New flag -XX:+TraceSignals. More detailed deopt printing.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1867
diff
changeset
|
3549 } |
0 | 3550 } |
3551 | |
3552 | |
3553 // This boolean allows users to forward their own non-matching signals | |
3554 // to JVM_handle_linux_signal, harmlessly. | |
3555 bool os::Linux::signal_handlers_are_installed = false; | |
3556 | |
3557 // For signal-chaining | |
3558 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
3559 unsigned int os::Linux::sigs = 0; | |
3560 bool os::Linux::libjsig_is_loaded = false; | |
3561 typedef struct sigaction *(*get_signal_t)(int); | |
3562 get_signal_t os::Linux::get_signal_action = NULL; | |
3563 | |
3564 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
3565 struct sigaction *actp = NULL; | |
3566 | |
3567 if (libjsig_is_loaded) { | |
3568 // Retrieve the old signal handler from libjsig | |
3569 actp = (*get_signal_action)(sig); | |
3570 } | |
3571 if (actp == NULL) { | |
3572 // Retrieve the preinstalled signal handler from jvm | |
3573 actp = get_preinstalled_handler(sig); | |
3574 } | |
3575 | |
3576 return actp; | |
3577 } | |
3578 | |
3579 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3580 siginfo_t *siginfo, void *context) { | |
3581 // Call the old signal handler | |
3582 if (actp->sa_handler == SIG_DFL) { | |
3583 // It's more reasonable to let jvm treat it as an unexpected exception | |
3584 // instead of taking the default action. | |
3585 return false; | |
3586 } else if (actp->sa_handler != SIG_IGN) { | |
3587 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
3588 // automaticlly block the signal | |
3589 sigaddset(&(actp->sa_mask), sig); | |
3590 } | |
3591 | |
3592 sa_handler_t hand; | |
3593 sa_sigaction_t sa; | |
3594 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
3595 // retrieve the chained handler | |
3596 if (siginfo_flag_set) { | |
3597 sa = actp->sa_sigaction; | |
3598 } else { | |
3599 hand = actp->sa_handler; | |
3600 } | |
3601 | |
3602 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
3603 actp->sa_handler = SIG_DFL; | |
3604 } | |
3605 | |
3606 // try to honor the signal mask | |
3607 sigset_t oset; | |
3608 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
3609 | |
3610 // call into the chained handler | |
3611 if (siginfo_flag_set) { | |
3612 (*sa)(sig, siginfo, context); | |
3613 } else { | |
3614 (*hand)(sig); | |
3615 } | |
3616 | |
3617 // restore the signal mask | |
3618 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
3619 } | |
3620 // Tell jvm's signal handler the signal is taken care of. | |
3621 return true; | |
3622 } | |
3623 | |
3624 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
3625 bool chained = false; | |
3626 // signal-chaining | |
3627 if (UseSignalChaining) { | |
3628 struct sigaction *actp = get_chained_signal_action(sig); | |
3629 if (actp != NULL) { | |
3630 chained = call_chained_handler(actp, sig, siginfo, context); | |
3631 } | |
3632 } | |
3633 return chained; | |
3634 } | |
3635 | |
3636 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
3637 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
3638 return &sigact[sig]; | |
3639 } | |
3640 return NULL; | |
3641 } | |
3642 | |
3643 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
3644 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3645 sigact[sig] = oldAct; | |
3646 sigs |= (unsigned int)1 << sig; | |
3647 } | |
3648 | |
3649 // for diagnostic | |
3650 int os::Linux::sigflags[MAXSIGNUM]; | |
3651 | |
3652 int os::Linux::get_our_sigflags(int sig) { | |
3653 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3654 return sigflags[sig]; | |
3655 } | |
3656 | |
3657 void os::Linux::set_our_sigflags(int sig, int flags) { | |
3658 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3659 sigflags[sig] = flags; | |
3660 } | |
3661 | |
3662 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
3663 // Check for overwrite. | |
3664 struct sigaction oldAct; | |
3665 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3666 | |
3667 void* oldhand = oldAct.sa_sigaction | |
3668 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3669 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3670 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3671 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3672 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3673 if (AllowUserSignalHandlers || !set_installed) { | |
3674 // Do not overwrite; user takes responsibility to forward to us. | |
3675 return; | |
3676 } else if (UseSignalChaining) { | |
3677 // save the old handler in jvm | |
3678 save_preinstalled_handler(sig, oldAct); | |
3679 // libjsig also interposes the sigaction() call below and saves the | |
3680 // old sigaction on it own. | |
3681 } else { | |
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
3682 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
3683 "%#lx for signal %d.", (long)oldhand, sig)); |
0 | 3684 } |
3685 } | |
3686 | |
3687 struct sigaction sigAct; | |
3688 sigfillset(&(sigAct.sa_mask)); | |
3689 sigAct.sa_handler = SIG_DFL; | |
3690 if (!set_installed) { | |
3691 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3692 } else { | |
3693 sigAct.sa_sigaction = signalHandler; | |
3694 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3695 } | |
3696 // Save flags, which are set by ours | |
3697 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3698 sigflags[sig] = sigAct.sa_flags; | |
3699 | |
3700 int ret = sigaction(sig, &sigAct, &oldAct); | |
3701 assert(ret == 0, "check"); | |
3702 | |
3703 void* oldhand2 = oldAct.sa_sigaction | |
3704 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3705 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3706 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3707 } | |
3708 | |
3709 // install signal handlers for signals that HotSpot needs to | |
3710 // handle in order to support Java-level exception handling. | |
3711 | |
3712 void os::Linux::install_signal_handlers() { | |
3713 if (!signal_handlers_are_installed) { | |
3714 signal_handlers_are_installed = true; | |
3715 | |
3716 // signal-chaining | |
3717 typedef void (*signal_setting_t)(); | |
3718 signal_setting_t begin_signal_setting = NULL; | |
3719 signal_setting_t end_signal_setting = NULL; | |
3720 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3721 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3722 if (begin_signal_setting != NULL) { | |
3723 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3724 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3725 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3726 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3727 libjsig_is_loaded = true; | |
3728 assert(UseSignalChaining, "should enable signal-chaining"); | |
3729 } | |
3730 if (libjsig_is_loaded) { | |
3731 // Tell libjsig jvm is setting signal handlers | |
3732 (*begin_signal_setting)(); | |
3733 } | |
3734 | |
3735 set_signal_handler(SIGSEGV, true); | |
3736 set_signal_handler(SIGPIPE, true); | |
3737 set_signal_handler(SIGBUS, true); | |
3738 set_signal_handler(SIGILL, true); | |
3739 set_signal_handler(SIGFPE, true); | |
3740 set_signal_handler(SIGXFSZ, true); | |
3741 | |
3742 if (libjsig_is_loaded) { | |
3743 // Tell libjsig jvm finishes setting signal handlers | |
3744 (*end_signal_setting)(); | |
3745 } | |
3746 | |
3747 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3748 // and if UserSignalHandler is installed all bets are off | |
3749 if (CheckJNICalls) { | |
3750 if (libjsig_is_loaded) { | |
3751 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
3752 check_signals = false; | |
3753 } | |
3754 if (AllowUserSignalHandlers) { | |
3755 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
3756 check_signals = false; | |
3757 } | |
3758 } | |
3759 } | |
3760 } | |
3761 | |
3762 // This is the fastest way to get thread cpu time on Linux. | |
3763 // Returns cpu time (user+sys) for any thread, not only for current. | |
3764 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
3765 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
3766 // For reference, please, see IEEE Std 1003.1-2004: | |
3767 // http://www.unix.org/single_unix_specification | |
3768 | |
3769 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
3770 struct timespec tp; | |
3771 int rc = os::Linux::clock_gettime(clockid, &tp); | |
3772 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
3773 | |
3774 return (tp.tv_sec * SEC_IN_NANOSECS) + tp.tv_nsec; | |
3775 } | |
3776 | |
3777 ///// | |
3778 // glibc on Linux platform uses non-documented flag | |
3779 // to indicate, that some special sort of signal | |
3780 // trampoline is used. | |
3781 // We will never set this flag, and we should | |
3782 // ignore this flag in our diagnostic | |
3783 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3784 #undef SIGNIFICANT_SIGNAL_MASK | |
3785 #endif | |
3786 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3787 | |
3788 static const char* get_signal_handler_name(address handler, | |
3789 char* buf, int buflen) { | |
3790 int offset; | |
3791 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3792 if (found) { | |
3793 // skip directory names | |
3794 const char *p1, *p2; | |
3795 p1 = buf; | |
3796 size_t len = strlen(os::file_separator()); | |
3797 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3798 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3799 } else { | |
3800 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3801 } | |
3802 return buf; | |
3803 } | |
3804 | |
3805 static void print_signal_handler(outputStream* st, int sig, | |
3806 char* buf, size_t buflen) { | |
3807 struct sigaction sa; | |
3808 | |
3809 sigaction(sig, NULL, &sa); | |
3810 | |
3811 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3812 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3813 | |
3814 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3815 | |
3816 address handler = (sa.sa_flags & SA_SIGINFO) | |
3817 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3818 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3819 | |
3820 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3821 st->print("SIG_DFL"); | |
3822 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3823 st->print("SIG_IGN"); | |
3824 } else { | |
3825 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3826 } | |
3827 | |
3828 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
3829 | |
3830 address rh = VMError::get_resetted_sighandler(sig); | |
3831 // May be, handler was resetted by VMError? | |
3832 if(rh != NULL) { | |
3833 handler = rh; | |
3834 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3835 } | |
3836 | |
3837 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
3838 | |
3839 // Check: is it our handler? | |
3840 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3841 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3842 // It is our signal handler | |
3843 // check for flags, reset system-used one! | |
3844 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
3845 st->print( | |
3846 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3847 os::Linux::get_our_sigflags(sig)); | |
3848 } | |
3849 } | |
3850 st->cr(); | |
3851 } | |
3852 | |
3853 | |
3854 #define DO_SIGNAL_CHECK(sig) \ | |
3855 if (!sigismember(&check_signal_done, sig)) \ | |
3856 os::Linux::check_signal_handler(sig) | |
3857 | |
3858 // This method is a periodic task to check for misbehaving JNI applications | |
3859 // under CheckJNI, we can add any periodic checks here | |
3860 | |
3861 void os::run_periodic_checks() { | |
3862 | |
3863 if (check_signals == false) return; | |
3864 | |
3865 // SEGV and BUS if overridden could potentially prevent | |
3866 // generation of hs*.log in the event of a crash, debugging | |
3867 // such a case can be very challenging, so we absolutely | |
3868 // check the following for a good measure: | |
3869 DO_SIGNAL_CHECK(SIGSEGV); | |
3870 DO_SIGNAL_CHECK(SIGILL); | |
3871 DO_SIGNAL_CHECK(SIGFPE); | |
3872 DO_SIGNAL_CHECK(SIGBUS); | |
3873 DO_SIGNAL_CHECK(SIGPIPE); | |
3874 DO_SIGNAL_CHECK(SIGXFSZ); | |
3875 | |
3876 | |
3877 // ReduceSignalUsage allows the user to override these handlers | |
3878 // see comments at the very top and jvm_solaris.h | |
3879 if (!ReduceSignalUsage) { | |
3880 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3881 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3882 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3883 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3884 } | |
3885 | |
3886 DO_SIGNAL_CHECK(SR_signum); | |
3887 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3888 } | |
3889 | |
3890 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3891 | |
3892 static os_sigaction_t os_sigaction = NULL; | |
3893 | |
3894 void os::Linux::check_signal_handler(int sig) { | |
3895 char buf[O_BUFLEN]; | |
3896 address jvmHandler = NULL; | |
3897 | |
3898 | |
3899 struct sigaction act; | |
3900 if (os_sigaction == NULL) { | |
3901 // only trust the default sigaction, in case it has been interposed | |
3902 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3903 if (os_sigaction == NULL) return; | |
3904 } | |
3905 | |
3906 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3907 | |
3908 | |
3909 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3910 | |
3911 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3912 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3913 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3914 | |
3915 | |
3916 switch(sig) { | |
3917 case SIGSEGV: | |
3918 case SIGBUS: | |
3919 case SIGFPE: | |
3920 case SIGPIPE: | |
3921 case SIGILL: | |
3922 case SIGXFSZ: | |
3923 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3924 break; | |
3925 | |
3926 case SHUTDOWN1_SIGNAL: | |
3927 case SHUTDOWN2_SIGNAL: | |
3928 case SHUTDOWN3_SIGNAL: | |
3929 case BREAK_SIGNAL: | |
3930 jvmHandler = (address)user_handler(); | |
3931 break; | |
3932 | |
3933 case INTERRUPT_SIGNAL: | |
3934 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3935 break; | |
3936 | |
3937 default: | |
3938 if (sig == SR_signum) { | |
3939 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3940 } else { | |
3941 return; | |
3942 } | |
3943 break; | |
3944 } | |
3945 | |
3946 if (thisHandler != jvmHandler) { | |
3947 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3948 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3949 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3950 // No need to check this sig any longer | |
3951 sigaddset(&check_signal_done, sig); | |
3952 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
3953 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3954 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
3955 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3956 // No need to check this sig any longer | |
3957 sigaddset(&check_signal_done, sig); | |
3958 } | |
3959 | |
3960 // Dump all the signal | |
3961 if (sigismember(&check_signal_done, sig)) { | |
3962 print_signal_handlers(tty, buf, O_BUFLEN); | |
3963 } | |
3964 } | |
3965 | |
3966 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3967 | |
3968 extern bool signal_name(int signo, char* buf, size_t len); | |
3969 | |
3970 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3971 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3972 // signal | |
3973 if (!signal_name(exception_code, buf, size)) { | |
3974 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3975 } | |
3976 return buf; | |
3977 } else { | |
3978 return NULL; | |
3979 } | |
3980 } | |
3981 | |
3982 // this is called _before_ the most of global arguments have been parsed | |
3983 void os::init(void) { | |
3984 char dummy; /* used to get a guess on initial stack address */ | |
3985 // first_hrtime = gethrtime(); | |
3986 | |
3987 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
3988 // is different than the pid of the java launcher thread. | |
3989 // So, on Linux, the launcher thread pid is passed to the VM | |
3990 // via the sun.java.launcher.pid property. | |
3991 // Use this property instead of getpid() if it was correctly passed. | |
3992 // See bug 6351349. | |
3993 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3994 | |
3995 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3996 | |
3997 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
3998 | |
3999 init_random(1234567); | |
4000 | |
4001 ThreadCritical::initialize(); | |
4002 | |
4003 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
4004 if (Linux::page_size() == -1) { | |
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4005 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4006 strerror(errno))); |
0 | 4007 } |
4008 init_page_sizes((size_t) Linux::page_size()); | |
4009 | |
4010 Linux::initialize_system_info(); | |
4011 | |
4012 // main_thread points to the aboriginal thread | |
4013 Linux::_main_thread = pthread_self(); | |
4014 | |
4015 Linux::clock_init(); | |
4016 initial_time_count = os::elapsed_counter(); | |
242 | 4017 pthread_mutex_init(&dl_mutex, NULL); |
0 | 4018 } |
4019 | |
4020 // To install functions for atexit system call | |
4021 extern "C" { | |
4022 static void perfMemory_exit_helper() { | |
4023 perfMemory_exit(); | |
4024 } | |
4025 } | |
4026 | |
4027 // this is called _after_ the global arguments have been parsed | |
4028 jint os::init_2(void) | |
4029 { | |
4030 Linux::fast_thread_clock_init(); | |
4031 | |
4032 // Allocate a single page and mark it as readable for safepoint polling | |
4033 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4034 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
4035 | |
4036 os::set_polling_page( polling_page ); | |
4037 | |
4038 #ifndef PRODUCT | |
4039 if(Verbose && PrintMiscellaneous) | |
4040 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
4041 #endif | |
4042 | |
4043 if (!UseMembar) { | |
4044 address mem_serialize_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4045 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
4046 os::set_memory_serialize_page( mem_serialize_page ); | |
4047 | |
4048 #ifndef PRODUCT | |
4049 if(Verbose && PrintMiscellaneous) | |
4050 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
4051 #endif | |
4052 } | |
4053 | |
4054 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); | |
4055 | |
4056 // initialize suspend/resume support - must do this before signal_sets_init() | |
4057 if (SR_initialize() != 0) { | |
4058 perror("SR_initialize failed"); | |
4059 return JNI_ERR; | |
4060 } | |
4061 | |
4062 Linux::signal_sets_init(); | |
4063 Linux::install_signal_handlers(); | |
4064 | |
1867
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4065 // Check minimum allowable stack size for thread creation and to initialize |
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4066 // the java system classes, including StackOverflowError - depends on page |
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4067 // size. Add a page for compiler2 recursion in main thread. |
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4068 // Add in 2*BytesPerWord times page size to account for VM stack during |
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4069 // class initialization depending on 32 or 64 bit VM. |
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4070 os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed, |
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4071 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ |
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4072 2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::page_size()); |
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4073 |
0 | 4074 size_t threadStackSizeInBytes = ThreadStackSize * K; |
4075 if (threadStackSizeInBytes != 0 && | |
1867
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4076 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
0 | 4077 tty->print_cr("\nThe stack size specified is too small, " |
4078 "Specify at least %dk", | |
1867
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4079 os::Linux::min_stack_allowed/ K); |
0 | 4080 return JNI_ERR; |
4081 } | |
4082 | |
4083 // Make the stack size a multiple of the page size so that | |
4084 // the yellow/red zones can be guarded. | |
4085 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
4086 vm_page_size())); | |
4087 | |
4088 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
4089 | |
4090 Linux::libpthread_init(); | |
4091 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
4092 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
4093 Linux::glibc_version(), Linux::libpthread_version(), | |
4094 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
4095 } | |
4096 | |
141 | 4097 if (UseNUMA) { |
462
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4098 if (!Linux::libnuma_init()) { |
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4099 UseNUMA = false; |
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4100 } else { |
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4101 if ((Linux::numa_max_node() < 1)) { |
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4102 // There's only one node(they start from 0), disable NUMA. |
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4103 UseNUMA = false; |
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4104 } |
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4105 } |
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4106 if (!UseNUMA && ForceNUMA) { |
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4107 UseNUMA = true; |
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4108 } |
141 | 4109 } |
4110 | |
0 | 4111 if (MaxFDLimit) { |
4112 // set the number of file descriptors to max. print out error | |
4113 // if getrlimit/setrlimit fails but continue regardless. | |
4114 struct rlimit nbr_files; | |
4115 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
4116 if (status != 0) { | |
4117 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4118 perror("os::init_2 getrlimit failed"); | |
4119 } else { | |
4120 nbr_files.rlim_cur = nbr_files.rlim_max; | |
4121 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
4122 if (status != 0) { | |
4123 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4124 perror("os::init_2 setrlimit failed"); | |
4125 } | |
4126 } | |
4127 } | |
4128 | |
4129 // Initialize lock used to serialize thread creation (see os::create_thread) | |
4130 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
4131 | |
4132 // at-exit methods are called in the reverse order of their registration. | |
4133 // atexit functions are called on return from main or as a result of a | |
4134 // call to exit(3C). There can be only 32 of these functions registered | |
4135 // and atexit() does not set errno. | |
4136 | |
4137 if (PerfAllowAtExitRegistration) { | |
4138 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
4139 // atexit functions can be delayed until process exit time, which | |
4140 // can be problematic for embedded VM situations. Embedded VMs should | |
4141 // call DestroyJavaVM() to assure that VM resources are released. | |
4142 | |
4143 // note: perfMemory_exit_helper atexit function may be removed in | |
4144 // the future if the appropriate cleanup code can be added to the | |
4145 // VM_Exit VMOperation's doit method. | |
4146 if (atexit(perfMemory_exit_helper) != 0) { | |
4147 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
4148 } | |
4149 } | |
4150 | |
4151 // initialize thread priority policy | |
4152 prio_init(); | |
4153 | |
4154 return JNI_OK; | |
4155 } | |
4156 | |
1681
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4157 // this is called at the end of vm_initialization |
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|
4158 void os::init_3(void) { } |
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4159 |
0 | 4160 // Mark the polling page as unreadable |
4161 void os::make_polling_page_unreadable(void) { | |
4162 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
4163 fatal("Could not disable polling page"); | |
4164 }; | |
4165 | |
4166 // Mark the polling page as readable | |
4167 void os::make_polling_page_readable(void) { | |
237
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4168 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
0 | 4169 fatal("Could not enable polling page"); |
237
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4170 } |
0 | 4171 }; |
4172 | |
4173 int os::active_processor_count() { | |
4174 // Linux doesn't yet have a (official) notion of processor sets, | |
4175 // so just return the number of online processors. | |
4176 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
4177 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
4178 return online_cpus; | |
4179 } | |
4180 | |
4181 bool os::distribute_processes(uint length, uint* distribution) { | |
4182 // Not yet implemented. | |
4183 return false; | |
4184 } | |
4185 | |
4186 bool os::bind_to_processor(uint processor_id) { | |
4187 // Not yet implemented. | |
4188 return false; | |
4189 } | |
4190 | |
4191 /// | |
4192 | |
4193 // Suspends the target using the signal mechanism and then grabs the PC before | |
4194 // resuming the target. Used by the flat-profiler only | |
4195 ExtendedPC os::get_thread_pc(Thread* thread) { | |
4196 // Make sure that it is called by the watcher for the VMThread | |
4197 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
4198 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
4199 | |
4200 ExtendedPC epc; | |
4201 | |
4202 OSThread* osthread = thread->osthread(); | |
4203 if (do_suspend(osthread)) { | |
4204 if (osthread->ucontext() != NULL) { | |
4205 epc = os::Linux::ucontext_get_pc(osthread->ucontext()); | |
4206 } else { | |
4207 // NULL context is unexpected, double-check this is the VMThread | |
4208 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
4209 } | |
4210 do_resume(osthread); | |
4211 } | |
4212 // failure means pthread_kill failed for some reason - arguably this is | |
4213 // a fatal problem, but such problems are ignored elsewhere | |
4214 | |
4215 return epc; | |
4216 } | |
4217 | |
4218 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
4219 { | |
4220 if (is_NPTL()) { | |
4221 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4222 } else { | |
4223 #ifndef IA64 | |
4224 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
4225 // word back to default 64bit precision if condvar is signaled. Java | |
4226 // wants 53bit precision. Save and restore current value. | |
4227 int fpu = get_fpu_control_word(); | |
4228 #endif // IA64 | |
4229 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4230 #ifndef IA64 | |
4231 set_fpu_control_word(fpu); | |
4232 #endif // IA64 | |
4233 return status; | |
4234 } | |
4235 } | |
4236 | |
4237 //////////////////////////////////////////////////////////////////////////////// | |
4238 // debug support | |
4239 | |
4240 static address same_page(address x, address y) { | |
4241 int page_bits = -os::vm_page_size(); | |
4242 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) | |
4243 return x; | |
4244 else if (x > y) | |
4245 return (address)(intptr_t(y) | ~page_bits) + 1; | |
4246 else | |
4247 return (address)(intptr_t(y) & page_bits); | |
4248 } | |
4249 | |
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4250 bool os::find(address addr, outputStream* st) { |
0 | 4251 Dl_info dlinfo; |
4252 memset(&dlinfo, 0, sizeof(dlinfo)); | |
4253 if (dladdr(addr, &dlinfo)) { | |
1681
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4254 st->print(PTR_FORMAT ": ", addr); |
0 | 4255 if (dlinfo.dli_sname != NULL) { |
1681
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|
4256 st->print("%s+%#x", dlinfo.dli_sname, |
0 | 4257 addr - (intptr_t)dlinfo.dli_saddr); |
4258 } else if (dlinfo.dli_fname) { | |
1681
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4259 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
0 | 4260 } else { |
1681
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|
4261 st->print("<absolute address>"); |
0 | 4262 } |
4263 if (dlinfo.dli_fname) { | |
1681
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4264 st->print(" in %s", dlinfo.dli_fname); |
0 | 4265 } |
4266 if (dlinfo.dli_fbase) { | |
1681
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4267 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
0 | 4268 } |
1681
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|
4269 st->cr(); |
0 | 4270 |
4271 if (Verbose) { | |
4272 // decode some bytes around the PC | |
4273 address begin = same_page(addr-40, addr); | |
4274 address end = same_page(addr+40, addr); | |
4275 address lowest = (address) dlinfo.dli_sname; | |
4276 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
4277 if (begin < lowest) begin = lowest; | |
4278 Dl_info dlinfo2; | |
4279 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
4280 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
4281 end = (address) dlinfo2.dli_saddr; | |
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|
4282 Disassembler::decode(begin, end, st); |
0 | 4283 } |
4284 return true; | |
4285 } | |
4286 return false; | |
4287 } | |
4288 | |
4289 //////////////////////////////////////////////////////////////////////////////// | |
4290 // misc | |
4291 | |
4292 // This does not do anything on Linux. This is basically a hook for being | |
4293 // able to use structured exception handling (thread-local exception filters) | |
4294 // on, e.g., Win32. | |
4295 void | |
4296 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
4297 JavaCallArguments* args, Thread* thread) { | |
4298 f(value, method, args, thread); | |
4299 } | |
4300 | |
4301 void os::print_statistics() { | |
4302 } | |
4303 | |
4304 int os::message_box(const char* title, const char* message) { | |
4305 int i; | |
4306 fdStream err(defaultStream::error_fd()); | |
4307 for (i = 0; i < 78; i++) err.print_raw("="); | |
4308 err.cr(); | |
4309 err.print_raw_cr(title); | |
4310 for (i = 0; i < 78; i++) err.print_raw("-"); | |
4311 err.cr(); | |
4312 err.print_raw_cr(message); | |
4313 for (i = 0; i < 78; i++) err.print_raw("="); | |
4314 err.cr(); | |
4315 | |
4316 char buf[16]; | |
4317 // Prevent process from exiting upon "read error" without consuming all CPU | |
4318 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
4319 | |
4320 return buf[0] == 'y' || buf[0] == 'Y'; | |
4321 } | |
4322 | |
4323 int os::stat(const char *path, struct stat *sbuf) { | |
4324 char pathbuf[MAX_PATH]; | |
4325 if (strlen(path) > MAX_PATH - 1) { | |
4326 errno = ENAMETOOLONG; | |
4327 return -1; | |
4328 } | |
1980
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|
4329 os::native_path(strcpy(pathbuf, path)); |
0 | 4330 return ::stat(pathbuf, sbuf); |
4331 } | |
4332 | |
4333 bool os::check_heap(bool force) { | |
4334 return true; | |
4335 } | |
4336 | |
4337 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
4338 return ::vsnprintf(buf, count, format, args); | |
4339 } | |
4340 | |
4341 // Is a (classpath) directory empty? | |
4342 bool os::dir_is_empty(const char* path) { | |
4343 DIR *dir = NULL; | |
4344 struct dirent *ptr; | |
4345 | |
4346 dir = opendir(path); | |
4347 if (dir == NULL) return true; | |
4348 | |
4349 /* Scan the directory */ | |
4350 bool result = true; | |
4351 char buf[sizeof(struct dirent) + MAX_PATH]; | |
4352 while (result && (ptr = ::readdir(dir)) != NULL) { | |
4353 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
4354 result = false; | |
4355 } | |
4356 } | |
4357 closedir(dir); | |
4358 return result; | |
4359 } | |
4360 | |
1980
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|
4361 // This code originates from JDK's sysOpen and open64_w |
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diff
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4362 // from src/solaris/hpi/src/system_md.c |
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|
4363 |
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|
4364 #ifndef O_DELETE |
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diff
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|
4365 #define O_DELETE 0x10000 |
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diff
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|
4366 #endif |
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|
4367 |
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|
4368 // Open a file. Unlink the file immediately after open returns |
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|
4369 // if the specified oflag has the O_DELETE flag set. |
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diff
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|
4370 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
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diff
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|
4371 |
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diff
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|
4372 int os::open(const char *path, int oflag, int mode) { |
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diff
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|
4373 |
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|
4374 if (strlen(path) > MAX_PATH - 1) { |
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diff
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|
4375 errno = ENAMETOOLONG; |
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diff
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|
4376 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4377 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4378 int fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4379 int o_delete = (oflag & O_DELETE); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4380 oflag = oflag & ~O_DELETE; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4381 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4382 fd = ::open64(path, oflag, mode); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4383 if (fd == -1) return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4384 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4385 //If the open succeeded, the file might still be a directory |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4386 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4387 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4388 int ret = ::fstat64(fd, &buf64); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4389 int st_mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4390 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4391 if (ret != -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4392 if ((st_mode & S_IFMT) == S_IFDIR) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4393 errno = EISDIR; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4394 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4395 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4396 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4397 } else { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4398 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4399 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4400 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4401 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4402 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4403 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4404 * All file descriptors that are opened in the JVM and not |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4405 * specifically destined for a subprocess should have the |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4406 * close-on-exec flag set. If we don't set it, then careless 3rd |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4407 * party native code might fork and exec without closing all |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4408 * appropriate file descriptors (e.g. as we do in closeDescriptors in |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4409 * UNIXProcess.c), and this in turn might: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4410 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4411 * - cause end-of-file to fail to be detected on some file |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4412 * descriptors, resulting in mysterious hangs, or |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4413 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4414 * - 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
|
4415 * suffering from bug 1085341. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4416 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4417 * (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
|
4418 * design flaw) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4419 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4420 * See: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4421 * 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
|
4422 * 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
|
4423 * 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
|
4424 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4425 #ifdef FD_CLOEXEC |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4426 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4427 int flags = ::fcntl(fd, F_GETFD); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4428 if (flags != -1) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4429 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4430 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4431 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4432 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4433 if (o_delete != 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4434 ::unlink(path); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4435 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4436 return fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4437 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4438 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4439 |
0 | 4440 // create binary file, rewriting existing file if required |
4441 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4442 int oflags = O_WRONLY | O_CREAT; | |
4443 if (!rewrite_existing) { | |
4444 oflags |= O_EXCL; | |
4445 } | |
4446 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
4447 } | |
4448 | |
4449 // return current position of file pointer | |
4450 jlong os::current_file_offset(int fd) { | |
4451 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
4452 } | |
4453 | |
4454 // move file pointer to the specified offset | |
4455 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4456 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
4457 } | |
4458 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4459 // This code originates from JDK's sysAvailable |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4460 // 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
|
4461 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4462 int os::available(int fd, jlong *bytes) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4463 jlong cur, end; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4464 int mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4465 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4466 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4467 if (::fstat64(fd, &buf64) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4468 mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4469 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
|
4470 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4471 * 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
|
4472 * 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
|
4473 * blocking, interruptible calls in this file. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4474 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4475 int n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4476 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4477 *bytes = n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4478 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4479 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4480 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4481 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4482 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4483 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4484 } 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
|
4485 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4486 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4487 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4488 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4489 *bytes = end - cur; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4490 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4491 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4492 |
2033
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4493 int os::socket_available(int fd, jint *pbytes) { |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4494 // Linux doc says EINTR not returned, unlike Solaris |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4495 int ret = ::ioctl(fd, FIONREAD, pbytes); |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4496 |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4497 //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4498 // is expected to return 0 on failure and 1 on success to the jdk. |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4499 return (ret < 0) ? 0 : 1; |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4500 } |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4501 |
0 | 4502 // Map a block of memory. |
4503 char* os::map_memory(int fd, const char* file_name, size_t file_offset, | |
4504 char *addr, size_t bytes, bool read_only, | |
4505 bool allow_exec) { | |
4506 int prot; | |
4507 int flags; | |
4508 | |
4509 if (read_only) { | |
4510 prot = PROT_READ; | |
4511 flags = MAP_SHARED; | |
4512 } else { | |
4513 prot = PROT_READ | PROT_WRITE; | |
4514 flags = MAP_PRIVATE; | |
4515 } | |
4516 | |
4517 if (allow_exec) { | |
4518 prot |= PROT_EXEC; | |
4519 } | |
4520 | |
4521 if (addr != NULL) { | |
4522 flags |= MAP_FIXED; | |
4523 } | |
4524 | |
4525 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
4526 fd, file_offset); | |
4527 if (mapped_address == MAP_FAILED) { | |
4528 return NULL; | |
4529 } | |
4530 return mapped_address; | |
4531 } | |
4532 | |
4533 | |
4534 // Remap a block of memory. | |
4535 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, | |
4536 char *addr, size_t bytes, bool read_only, | |
4537 bool allow_exec) { | |
4538 // same as map_memory() on this OS | |
4539 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4540 allow_exec); | |
4541 } | |
4542 | |
4543 | |
4544 // Unmap a block of memory. | |
4545 bool os::unmap_memory(char* addr, size_t bytes) { | |
4546 return munmap(addr, bytes) == 0; | |
4547 } | |
4548 | |
4549 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
4550 | |
4551 static clockid_t thread_cpu_clockid(Thread* thread) { | |
4552 pthread_t tid = thread->osthread()->pthread_id(); | |
4553 clockid_t clockid; | |
4554 | |
4555 // Get thread clockid | |
4556 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
4557 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
4558 return clockid; | |
4559 } | |
4560 | |
4561 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
4562 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
4563 // of a thread. | |
4564 // | |
4565 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
4566 // the fast estimate available on the platform. | |
4567 | |
4568 jlong os::current_thread_cpu_time() { | |
4569 if (os::Linux::supports_fast_thread_cpu_time()) { | |
4570 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
4571 } else { | |
4572 // return user + sys since the cost is the same | |
4573 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
4574 } | |
4575 } | |
4576 | |
4577 jlong os::thread_cpu_time(Thread* thread) { | |
4578 // consistent with what current_thread_cpu_time() returns | |
4579 if (os::Linux::supports_fast_thread_cpu_time()) { | |
4580 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
4581 } else { | |
4582 return slow_thread_cpu_time(thread, true /* user + sys */); | |
4583 } | |
4584 } | |
4585 | |
4586 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
4587 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
4588 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
4589 } else { | |
4590 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
4591 } | |
4592 } | |
4593 | |
4594 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4595 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
4596 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
4597 } else { | |
4598 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
4599 } | |
4600 } | |
4601 | |
4602 // | |
4603 // -1 on error. | |
4604 // | |
4605 | |
4606 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4607 static bool proc_pid_cpu_avail = true; | |
4608 static bool proc_task_unchecked = true; | |
4609 static const char *proc_stat_path = "/proc/%d/stat"; | |
4610 pid_t tid = thread->osthread()->thread_id(); | |
4611 int i; | |
4612 char *s; | |
4613 char stat[2048]; | |
4614 int statlen; | |
4615 char proc_name[64]; | |
4616 int count; | |
4617 long sys_time, user_time; | |
4618 char string[64]; | |
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4619 char cdummy; |
0 | 4620 int idummy; |
4621 long ldummy; | |
4622 FILE *fp; | |
4623 | |
4624 // We first try accessing /proc/<pid>/cpu since this is faster to | |
4625 // process. If this file is not present (linux kernels 2.5 and above) | |
4626 // then we open /proc/<pid>/stat. | |
4627 if ( proc_pid_cpu_avail ) { | |
4628 sprintf(proc_name, "/proc/%d/cpu", tid); | |
4629 fp = fopen(proc_name, "r"); | |
4630 if ( fp != NULL ) { | |
4631 count = fscanf( fp, "%s %lu %lu\n", string, &user_time, &sys_time); | |
4632 fclose(fp); | |
4633 if ( count != 3 ) return -1; | |
4634 | |
4635 if (user_sys_cpu_time) { | |
4636 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
4637 } else { | |
4638 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
4639 } | |
4640 } | |
4641 else proc_pid_cpu_avail = false; | |
4642 } | |
4643 | |
4644 // The /proc/<tid>/stat aggregates per-process usage on | |
4645 // new Linux kernels 2.6+ where NPTL is supported. | |
4646 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
4647 // See bug 6328462. | |
4648 // There can be no directory /proc/self/task on kernels 2.4 with NPTL | |
4649 // and possibly in some other cases, so we check its availability. | |
4650 if (proc_task_unchecked && os::Linux::is_NPTL()) { | |
4651 // This is executed only once | |
4652 proc_task_unchecked = false; | |
4653 fp = fopen("/proc/self/task", "r"); | |
4654 if (fp != NULL) { | |
4655 proc_stat_path = "/proc/self/task/%d/stat"; | |
4656 fclose(fp); | |
4657 } | |
4658 } | |
4659 | |
4660 sprintf(proc_name, proc_stat_path, tid); | |
4661 fp = fopen(proc_name, "r"); | |
4662 if ( fp == NULL ) return -1; | |
4663 statlen = fread(stat, 1, 2047, fp); | |
4664 stat[statlen] = '\0'; | |
4665 fclose(fp); | |
4666 | |
4667 // Skip pid and the command string. Note that we could be dealing with | |
4668 // weird command names, e.g. user could decide to rename java launcher | |
4669 // to "java 1.4.2 :)", then the stat file would look like | |
4670 // 1234 (java 1.4.2 :)) R ... ... | |
4671 // We don't really need to know the command string, just find the last | |
4672 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
4673 s = strrchr(stat, ')'); | |
4674 i = 0; | |
4675 if (s == NULL ) return -1; | |
4676 | |
4677 // Skip blank chars | |
4678 do s++; while (isspace(*s)); | |
4679 | |
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4680 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
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4681 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
0 | 4682 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
4683 &user_time, &sys_time); | |
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4684 if ( count != 13 ) return -1; |
0 | 4685 if (user_sys_cpu_time) { |
4686 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
4687 } else { | |
4688 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
4689 } | |
4690 } | |
4691 | |
4692 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4693 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4694 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4695 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4696 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4697 } | |
4698 | |
4699 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4700 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4701 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4702 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4703 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4704 } | |
4705 | |
4706 bool os::is_thread_cpu_time_supported() { | |
4707 return true; | |
4708 } | |
4709 | |
4710 // System loadavg support. Returns -1 if load average cannot be obtained. | |
4711 // Linux doesn't yet have a (official) notion of processor sets, | |
4712 // so just return the system wide load average. | |
4713 int os::loadavg(double loadavg[], int nelem) { | |
4714 return ::getloadavg(loadavg, nelem); | |
4715 } | |
4716 | |
4717 void os::pause() { | |
4718 char filename[MAX_PATH]; | |
4719 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
4720 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
4721 } else { | |
4722 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
4723 } | |
4724 | |
4725 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
4726 if (fd != -1) { | |
4727 struct stat buf; | |
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4728 ::close(fd); |
0 | 4729 while (::stat(filename, &buf) == 0) { |
4730 (void)::poll(NULL, 0, 100); | |
4731 } | |
4732 } else { | |
4733 jio_fprintf(stderr, | |
4734 "Could not open pause file '%s', continuing immediately.\n", filename); | |
4735 } | |
4736 } | |
4737 | |
4738 | |
4739 // Refer to the comments in os_solaris.cpp park-unpark. | |
4740 // | |
4741 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
4742 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
4743 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
4744 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
4745 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
4746 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4747 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4748 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4749 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4750 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4751 // of libpthread avoids the problem, but isn't practical. | |
4752 // | |
4753 // Possible remedies: | |
4754 // | |
4755 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4756 // This is palliative and probabilistic, however. If the thread is preempted | |
4757 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4758 // than the minimum period may have passed, and the abstime may be stale (in the | |
4759 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4760 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4761 // | |
4762 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4763 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4764 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4765 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4766 // thread. | |
4767 // | |
4768 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4769 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4770 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4771 // This also works well. In fact it avoids kernel-level scalability impediments | |
4772 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4773 // timers in a graceful fashion. | |
4774 // | |
4775 // 4. When the abstime value is in the past it appears that control returns | |
4776 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4777 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4778 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4779 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4780 // It may be possible to avoid reinitialization by checking the return | |
4781 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4782 // condvar we must establish the invariant that cond_signal() is only called | |
4783 // within critical sections protected by the adjunct mutex. This prevents | |
4784 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4785 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4786 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4787 // | |
4788 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4789 // structure when a condvar is used or initialized. cond_destroy() would | |
4790 // release the helper structure. Our reinitialize-after-timedwait fix | |
4791 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4792 // | |
4793 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4794 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4795 // and only enabling the work-around for vulnerable environments. | |
4796 | |
4797 // utility to compute the abstime argument to timedwait: | |
4798 // millis is the relative timeout time | |
4799 // abstime will be the absolute timeout time | |
4800 // TODO: replace compute_abstime() with unpackTime() | |
4801 | |
4802 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
4803 if (millis < 0) millis = 0; | |
4804 struct timeval now; | |
4805 int status = gettimeofday(&now, NULL); | |
4806 assert(status == 0, "gettimeofday"); | |
4807 jlong seconds = millis / 1000; | |
4808 millis %= 1000; | |
4809 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4810 seconds = 50000000; | |
4811 } | |
4812 abstime->tv_sec = now.tv_sec + seconds; | |
4813 long usec = now.tv_usec + millis * 1000; | |
4814 if (usec >= 1000000) { | |
4815 abstime->tv_sec += 1; | |
4816 usec -= 1000000; | |
4817 } | |
4818 abstime->tv_nsec = usec * 1000; | |
4819 return abstime; | |
4820 } | |
4821 | |
4822 | |
4823 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4824 // Conceptually TryPark() should be equivalent to park(0). | |
4825 | |
4826 int os::PlatformEvent::TryPark() { | |
4827 for (;;) { | |
4828 const int v = _Event ; | |
4829 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4830 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4831 } | |
4832 } | |
4833 | |
4834 void os::PlatformEvent::park() { // AKA "down()" | |
4835 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4836 // may call park(). | |
4837 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4838 int v ; | |
4839 for (;;) { | |
4840 v = _Event ; | |
4841 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4842 } | |
4843 guarantee (v >= 0, "invariant") ; | |
4844 if (v == 0) { | |
4845 // Do this the hard way by blocking ... | |
4846 int status = pthread_mutex_lock(_mutex); | |
4847 assert_status(status == 0, status, "mutex_lock"); | |
4848 guarantee (_nParked == 0, "invariant") ; | |
4849 ++ _nParked ; | |
4850 while (_Event < 0) { | |
4851 status = pthread_cond_wait(_cond, _mutex); | |
4852 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4853 // Treat this the same as if the wait was interrupted | |
4854 if (status == ETIME) { status = EINTR; } | |
4855 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4856 } | |
4857 -- _nParked ; | |
4858 | |
4859 // In theory we could move the ST of 0 into _Event past the unlock(), | |
4860 // but then we'd need a MEMBAR after the ST. | |
4861 _Event = 0 ; | |
4862 status = pthread_mutex_unlock(_mutex); | |
4863 assert_status(status == 0, status, "mutex_unlock"); | |
4864 } | |
4865 guarantee (_Event >= 0, "invariant") ; | |
4866 } | |
4867 | |
4868 int os::PlatformEvent::park(jlong millis) { | |
4869 guarantee (_nParked == 0, "invariant") ; | |
4870 | |
4871 int v ; | |
4872 for (;;) { | |
4873 v = _Event ; | |
4874 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4875 } | |
4876 guarantee (v >= 0, "invariant") ; | |
4877 if (v != 0) return OS_OK ; | |
4878 | |
4879 // We do this the hard way, by blocking the thread. | |
4880 // Consider enforcing a minimum timeout value. | |
4881 struct timespec abst; | |
4882 compute_abstime(&abst, millis); | |
4883 | |
4884 int ret = OS_TIMEOUT; | |
4885 int status = pthread_mutex_lock(_mutex); | |
4886 assert_status(status == 0, status, "mutex_lock"); | |
4887 guarantee (_nParked == 0, "invariant") ; | |
4888 ++_nParked ; | |
4889 | |
4890 // Object.wait(timo) will return because of | |
4891 // (a) notification | |
4892 // (b) timeout | |
4893 // (c) thread.interrupt | |
4894 // | |
4895 // Thread.interrupt and object.notify{All} both call Event::set. | |
4896 // That is, we treat thread.interrupt as a special case of notification. | |
4897 // The underlying Solaris implementation, cond_timedwait, admits | |
4898 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4899 // JVM from making those visible to Java code. As such, we must | |
4900 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4901 // | |
4902 // TODO: properly differentiate simultaneous notify+interrupt. | |
4903 // In that case, we should propagate the notify to another waiter. | |
4904 | |
4905 while (_Event < 0) { | |
4906 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
4907 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4908 pthread_cond_destroy (_cond); | |
4909 pthread_cond_init (_cond, NULL) ; | |
4910 } | |
4911 assert_status(status == 0 || status == EINTR || | |
4912 status == ETIME || status == ETIMEDOUT, | |
4913 status, "cond_timedwait"); | |
4914 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4915 if (status == ETIME || status == ETIMEDOUT) break ; | |
4916 // We consume and ignore EINTR and spurious wakeups. | |
4917 } | |
4918 --_nParked ; | |
4919 if (_Event >= 0) { | |
4920 ret = OS_OK; | |
4921 } | |
4922 _Event = 0 ; | |
4923 status = pthread_mutex_unlock(_mutex); | |
4924 assert_status(status == 0, status, "mutex_unlock"); | |
4925 assert (_nParked == 0, "invariant") ; | |
4926 return ret; | |
4927 } | |
4928 | |
4929 void os::PlatformEvent::unpark() { | |
4930 int v, AnyWaiters ; | |
4931 for (;;) { | |
4932 v = _Event ; | |
4933 if (v > 0) { | |
4934 // The LD of _Event could have reordered or be satisfied | |
4935 // by a read-aside from this processor's write buffer. | |
4936 // To avoid problems execute a barrier and then | |
4937 // ratify the value. | |
4938 OrderAccess::fence() ; | |
4939 if (_Event == v) return ; | |
4940 continue ; | |
4941 } | |
4942 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; | |
4943 } | |
4944 if (v < 0) { | |
4945 // Wait for the thread associated with the event to vacate | |
4946 int status = pthread_mutex_lock(_mutex); | |
4947 assert_status(status == 0, status, "mutex_lock"); | |
4948 AnyWaiters = _nParked ; | |
4949 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; | |
4950 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { | |
4951 AnyWaiters = 0 ; | |
4952 pthread_cond_signal (_cond); | |
4953 } | |
4954 status = pthread_mutex_unlock(_mutex); | |
4955 assert_status(status == 0, status, "mutex_unlock"); | |
4956 if (AnyWaiters != 0) { | |
4957 status = pthread_cond_signal(_cond); | |
4958 assert_status(status == 0, status, "cond_signal"); | |
4959 } | |
4960 } | |
4961 | |
4962 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4963 // This is safe and avoids a common class of futile wakeups. In rare | |
4964 // circumstances this can cause a thread to return prematurely from | |
4965 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4966 // simply re-test the condition and re-park itself. | |
4967 } | |
4968 | |
4969 | |
4970 // JSR166 | |
4971 // ------------------------------------------------------- | |
4972 | |
4973 /* | |
4974 * The solaris and linux implementations of park/unpark are fairly | |
4975 * conservative for now, but can be improved. They currently use a | |
4976 * mutex/condvar pair, plus a a count. | |
4977 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4978 * sets count to 1 and signals condvar. Only one thread ever waits | |
4979 * on the condvar. Contention seen when trying to park implies that someone | |
4980 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4981 * is no need to track notifications. | |
4982 */ | |
4983 | |
4984 | |
4985 #define NANOSECS_PER_SEC 1000000000 | |
4986 #define NANOSECS_PER_MILLISEC 1000000 | |
4987 #define MAX_SECS 100000000 | |
4988 /* | |
4989 * This code is common to linux and solaris and will be moved to a | |
4990 * common place in dolphin. | |
4991 * | |
4992 * The passed in time value is either a relative time in nanoseconds | |
4993 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4994 * into suitable seconds and nanoseconds components and stored in the | |
4995 * given timespec structure. | |
4996 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4997 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
4998 * overflow if times way in the future are given. Further on Solaris versions | |
4999 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
5000 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
5001 * As it will be 28 years before "now + 100000000" will overflow we can | |
5002 * ignore overflow and just impose a hard-limit on seconds using the value | |
5003 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
5004 * years from "now". | |
5005 */ | |
5006 | |
5007 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
5008 assert (time > 0, "convertTime"); | |
5009 | |
5010 struct timeval now; | |
5011 int status = gettimeofday(&now, NULL); | |
5012 assert(status == 0, "gettimeofday"); | |
5013 | |
5014 time_t max_secs = now.tv_sec + MAX_SECS; | |
5015 | |
5016 if (isAbsolute) { | |
5017 jlong secs = time / 1000; | |
5018 if (secs > max_secs) { | |
5019 absTime->tv_sec = max_secs; | |
5020 } | |
5021 else { | |
5022 absTime->tv_sec = secs; | |
5023 } | |
5024 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
5025 } | |
5026 else { | |
5027 jlong secs = time / NANOSECS_PER_SEC; | |
5028 if (secs >= MAX_SECS) { | |
5029 absTime->tv_sec = max_secs; | |
5030 absTime->tv_nsec = 0; | |
5031 } | |
5032 else { | |
5033 absTime->tv_sec = now.tv_sec + secs; | |
5034 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
5035 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
5036 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
5037 ++absTime->tv_sec; // note: this must be <= max_secs | |
5038 } | |
5039 } | |
5040 } | |
5041 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
5042 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
5043 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
5044 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
5045 } | |
5046 | |
5047 void Parker::park(bool isAbsolute, jlong time) { | |
5048 // Optional fast-path check: | |
5049 // Return immediately if a permit is available. | |
5050 if (_counter > 0) { | |
5051 _counter = 0 ; | |
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5052 OrderAccess::fence(); |
0 | 5053 return ; |
5054 } | |
5055 | |
5056 Thread* thread = Thread::current(); | |
5057 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
5058 JavaThread *jt = (JavaThread *)thread; | |
5059 | |
5060 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
5061 // Check interrupt before trying to wait | |
5062 if (Thread::is_interrupted(thread, false)) { | |
5063 return; | |
5064 } | |
5065 | |
5066 // Next, demultiplex/decode time arguments | |
5067 timespec absTime; | |
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1c352af0135d
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changeset
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5068 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
0 | 5069 return; |
5070 } | |
5071 if (time > 0) { | |
5072 unpackTime(&absTime, isAbsolute, time); | |
5073 } | |
5074 | |
5075 | |
5076 // Enter safepoint region | |
5077 // Beware of deadlocks such as 6317397. | |
5078 // The per-thread Parker:: mutex is a classic leaf-lock. | |
5079 // In particular a thread must never block on the Threads_lock while | |
5080 // holding the Parker:: mutex. If safepoints are pending both the | |
5081 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
5082 ThreadBlockInVM tbivm(jt); | |
5083 | |
5084 // Don't wait if cannot get lock since interference arises from | |
5085 // unblocking. Also. check interrupt before trying wait | |
5086 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
5087 return; | |
5088 } | |
5089 | |
5090 int status ; | |
5091 if (_counter > 0) { // no wait needed | |
5092 _counter = 0; | |
5093 status = pthread_mutex_unlock(_mutex); | |
5094 assert (status == 0, "invariant") ; | |
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5095 OrderAccess::fence(); |
0 | 5096 return; |
5097 } | |
5098 | |
5099 #ifdef ASSERT | |
5100 // Don't catch signals while blocked; let the running threads have the signals. | |
5101 // (This allows a debugger to break into the running thread.) | |
5102 sigset_t oldsigs; | |
5103 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
5104 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
5105 #endif | |
5106 | |
5107 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5108 jt->set_suspend_equivalent(); | |
5109 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5110 | |
5111 if (time == 0) { | |
5112 status = pthread_cond_wait (_cond, _mutex) ; | |
5113 } else { | |
5114 status = os::Linux::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
5115 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5116 pthread_cond_destroy (_cond) ; | |
5117 pthread_cond_init (_cond, NULL); | |
5118 } | |
5119 } | |
5120 assert_status(status == 0 || status == EINTR || | |
5121 status == ETIME || status == ETIMEDOUT, | |
5122 status, "cond_timedwait"); | |
5123 | |
5124 #ifdef ASSERT | |
5125 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
5126 #endif | |
5127 | |
5128 _counter = 0 ; | |
5129 status = pthread_mutex_unlock(_mutex) ; | |
5130 assert_status(status == 0, status, "invariant") ; | |
5131 // If externally suspended while waiting, re-suspend | |
5132 if (jt->handle_special_suspend_equivalent_condition()) { | |
5133 jt->java_suspend_self(); | |
5134 } | |
5135 | |
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5136 OrderAccess::fence(); |
0 | 5137 } |
5138 | |
5139 void Parker::unpark() { | |
5140 int s, status ; | |
5141 status = pthread_mutex_lock(_mutex); | |
5142 assert (status == 0, "invariant") ; | |
5143 s = _counter; | |
5144 _counter = 1; | |
5145 if (s < 1) { | |
5146 if (WorkAroundNPTLTimedWaitHang) { | |
5147 status = pthread_cond_signal (_cond) ; | |
5148 assert (status == 0, "invariant") ; | |
5149 status = pthread_mutex_unlock(_mutex); | |
5150 assert (status == 0, "invariant") ; | |
5151 } else { | |
5152 status = pthread_mutex_unlock(_mutex); | |
5153 assert (status == 0, "invariant") ; | |
5154 status = pthread_cond_signal (_cond) ; | |
5155 assert (status == 0, "invariant") ; | |
5156 } | |
5157 } else { | |
5158 pthread_mutex_unlock(_mutex); | |
5159 assert (status == 0, "invariant") ; | |
5160 } | |
5161 } | |
5162 | |
5163 | |
5164 extern char** environ; | |
5165 | |
5166 #ifndef __NR_fork | |
5167 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
5168 #endif | |
5169 | |
5170 #ifndef __NR_execve | |
5171 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
5172 #endif | |
5173 | |
5174 // Run the specified command in a separate process. Return its exit value, | |
5175 // or -1 on failure (e.g. can't fork a new process). | |
5176 // Unlike system(), this function can be called from signal handler. It | |
5177 // doesn't block SIGINT et al. | |
5178 int os::fork_and_exec(char* cmd) { | |
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5179 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
0 | 5180 |
5181 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
5182 // pthread_atfork handlers and reset pthread library. All we need is a | |
5183 // separate process to execve. Make a direct syscall to fork process. | |
5184 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
5185 // the best... | |
5186 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
5187 IA64_ONLY(fork();) | |
5188 | |
5189 if (pid < 0) { | |
5190 // fork failed | |
5191 return -1; | |
5192 | |
5193 } else if (pid == 0) { | |
5194 // child process | |
5195 | |
5196 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
5197 // first to kill every thread on the thread list. Because this list is | |
5198 // not reset by fork() (see notes above), execve() will instead kill | |
5199 // every thread in the parent process. We know this is the only thread | |
5200 // in the new process, so make a system call directly. | |
5201 // IA64 should use normal execve() from glibc to match the glibc fork() | |
5202 // above. | |
5203 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);) | |
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5204 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
0 | 5205 |
5206 // execve failed | |
5207 _exit(-1); | |
5208 | |
5209 } else { | |
5210 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
5211 // care about the actual exit code, for now. | |
5212 | |
5213 int status; | |
5214 | |
5215 // Wait for the child process to exit. This returns immediately if | |
5216 // the child has already exited. */ | |
5217 while (waitpid(pid, &status, 0) < 0) { | |
5218 switch (errno) { | |
5219 case ECHILD: return 0; | |
5220 case EINTR: break; | |
5221 default: return -1; | |
5222 } | |
5223 } | |
5224 | |
5225 if (WIFEXITED(status)) { | |
5226 // The child exited normally; get its exit code. | |
5227 return WEXITSTATUS(status); | |
5228 } else if (WIFSIGNALED(status)) { | |
5229 // The child exited because of a signal | |
5230 // The best value to return is 0x80 + signal number, | |
5231 // because that is what all Unix shells do, and because | |
5232 // it allows callers to distinguish between process exit and | |
5233 // process death by signal. | |
5234 return 0x80 + WTERMSIG(status); | |
5235 } else { | |
5236 // Unknown exit code; pass it through | |
5237 return status; | |
5238 } | |
5239 } | |
5240 } | |
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5241 |
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5242 // is_headless_jre() |
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5243 // |
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5244 // Test for the existence of libmawt in motif21 or xawt directories |
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5245 // in order to report if we are running in a headless jre |
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|
5246 // |
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5247 bool os::is_headless_jre() { |
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|
5248 struct stat statbuf; |
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5249 char buf[MAXPATHLEN]; |
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5250 char libmawtpath[MAXPATHLEN]; |
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5251 const char *xawtstr = "/xawt/libmawt.so"; |
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5252 const char *motifstr = "/motif21/libmawt.so"; |
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5253 char *p; |
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|
5254 |
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5255 // Get path to libjvm.so |
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|
5256 os::jvm_path(buf, sizeof(buf)); |
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|
5257 |
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5258 // Get rid of libjvm.so |
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|
5259 p = strrchr(buf, '/'); |
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|
5260 if (p == NULL) return false; |
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|
5261 else *p = '\0'; |
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|
5262 |
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5263 // Get rid of client or server |
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|
5264 p = strrchr(buf, '/'); |
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|
5265 if (p == NULL) return false; |
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|
5266 else *p = '\0'; |
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|
5267 |
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|
5268 // check xawt/libmawt.so |
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|
5269 strcpy(libmawtpath, buf); |
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|
5270 strcat(libmawtpath, xawtstr); |
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|
5271 if (::stat(libmawtpath, &statbuf) == 0) return false; |
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|
5272 |
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|
5273 // check motif21/libmawt.so |
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|
5274 strcpy(libmawtpath, buf); |
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|
5275 strcat(libmawtpath, motifstr); |
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|
5276 if (::stat(libmawtpath, &statbuf) == 0) return false; |
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|
5277 |
126ea7725993
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|
5278 return true; |
126ea7725993
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|
5279 } |
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|
5280 |