Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 12951:b3a4d4279fa3
Merge
author | ccheung |
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date | Thu, 24 Oct 2013 17:20:39 -0400 |
parents | 3e265ce4d2dd |
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rev | line source |
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3960 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
3960 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 // no precompiled headers | |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "code/vtableStubs.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
3960 | 33 #include "interpreter/interpreter.hpp" |
34 #include "jvm_bsd.h" | |
35 #include "memory/allocation.inline.hpp" | |
36 #include "memory/filemap.hpp" | |
37 #include "mutex_bsd.inline.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "os_share_bsd.hpp" | |
40 #include "prims/jniFastGetField.hpp" | |
41 #include "prims/jvm.h" | |
42 #include "prims/jvm_misc.hpp" | |
43 #include "runtime/arguments.hpp" | |
44 #include "runtime/extendedPC.hpp" | |
45 #include "runtime/globals.hpp" | |
46 #include "runtime/interfaceSupport.hpp" | |
47 #include "runtime/java.hpp" | |
48 #include "runtime/javaCalls.hpp" | |
49 #include "runtime/mutexLocker.hpp" | |
50 #include "runtime/objectMonitor.hpp" | |
51 #include "runtime/osThread.hpp" | |
52 #include "runtime/perfMemory.hpp" | |
53 #include "runtime/sharedRuntime.hpp" | |
54 #include "runtime/statSampler.hpp" | |
55 #include "runtime/stubRoutines.hpp" | |
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56 #include "runtime/thread.inline.hpp" |
3960 | 57 #include "runtime/threadCritical.hpp" |
58 #include "runtime/timer.hpp" | |
59 #include "services/attachListener.hpp" | |
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60 #include "services/memTracker.hpp" |
3960 | 61 #include "services/runtimeService.hpp" |
62 #include "utilities/decoder.hpp" | |
63 #include "utilities/defaultStream.hpp" | |
64 #include "utilities/events.hpp" | |
65 #include "utilities/growableArray.hpp" | |
66 #include "utilities/vmError.hpp" | |
67 | |
68 // put OS-includes here | |
69 # include <sys/types.h> | |
70 # include <sys/mman.h> | |
71 # include <sys/stat.h> | |
72 # include <sys/select.h> | |
73 # include <pthread.h> | |
74 # include <signal.h> | |
75 # include <errno.h> | |
76 # include <dlfcn.h> | |
77 # include <stdio.h> | |
78 # include <unistd.h> | |
79 # include <sys/resource.h> | |
80 # include <pthread.h> | |
81 # include <sys/stat.h> | |
82 # include <sys/time.h> | |
83 # include <sys/times.h> | |
84 # include <sys/utsname.h> | |
85 # include <sys/socket.h> | |
86 # include <sys/wait.h> | |
87 # include <time.h> | |
88 # include <pwd.h> | |
89 # include <poll.h> | |
90 # include <semaphore.h> | |
91 # include <fcntl.h> | |
92 # include <string.h> | |
93 # include <sys/param.h> | |
94 # include <sys/sysctl.h> | |
95 # include <sys/ipc.h> | |
96 # include <sys/shm.h> | |
97 #ifndef __APPLE__ | |
98 # include <link.h> | |
99 #endif | |
100 # include <stdint.h> | |
101 # include <inttypes.h> | |
102 # include <sys/ioctl.h> | |
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103 # include <sys/syscall.h> |
3960 | 104 |
105 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
106 # include <elf.h> | |
107 #endif | |
108 | |
109 #ifdef __APPLE__ | |
4006 | 110 # include <mach/mach.h> // semaphore_* API |
111 # include <mach-o/dyld.h> | |
112 # include <sys/proc_info.h> | |
113 # include <objc/objc-auto.h> | |
3960 | 114 #endif |
115 | |
116 #ifndef MAP_ANONYMOUS | |
117 #define MAP_ANONYMOUS MAP_ANON | |
118 #endif | |
119 | |
120 #define MAX_PATH (2 * K) | |
121 | |
122 // for timer info max values which include all bits | |
123 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
124 | |
125 #define LARGEPAGES_BIT (1 << 6) | |
126 //////////////////////////////////////////////////////////////////////////////// | |
127 // global variables | |
128 julong os::Bsd::_physical_memory = 0; | |
129 | |
130 | |
131 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
132 pthread_t os::Bsd::_main_thread; | |
133 int os::Bsd::_page_size = -1; | |
134 | |
135 static jlong initial_time_count=0; | |
136 | |
137 static int clock_tics_per_sec = 100; | |
138 | |
139 // For diagnostics to print a message once. see run_periodic_checks | |
140 static sigset_t check_signal_done; | |
6918 | 141 static bool check_signals = true; |
3960 | 142 |
143 static pid_t _initial_pid = 0; | |
144 | |
145 /* Signal number used to suspend/resume a thread */ | |
146 | |
147 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
148 static int SR_signum = SIGUSR2; | |
149 sigset_t SR_sigset; | |
150 | |
151 | |
152 //////////////////////////////////////////////////////////////////////////////// | |
153 // utility functions | |
154 | |
155 static int SR_initialize(); | |
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156 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); |
3960 | 157 |
158 julong os::available_memory() { | |
159 return Bsd::available_memory(); | |
160 } | |
161 | |
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162 // available here means free |
3960 | 163 julong os::Bsd::available_memory() { |
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164 uint64_t available = physical_memory() >> 2; |
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165 #ifdef __APPLE__ |
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166 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; |
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167 vm_statistics64_data_t vmstat; |
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168 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, |
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169 (host_info64_t)&vmstat, &count); |
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170 assert(kerr == KERN_SUCCESS, |
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171 "host_statistics64 failed - check mach_host_self() and count"); |
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172 if (kerr == KERN_SUCCESS) { |
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173 available = vmstat.free_count * os::vm_page_size(); |
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174 } |
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175 #endif |
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176 return available; |
3960 | 177 } |
178 | |
179 julong os::physical_memory() { | |
180 return Bsd::physical_memory(); | |
181 } | |
182 | |
183 //////////////////////////////////////////////////////////////////////////////// | |
184 // environment support | |
185 | |
186 bool os::getenv(const char* name, char* buf, int len) { | |
187 const char* val = ::getenv(name); | |
188 if (val != NULL && strlen(val) < (size_t)len) { | |
189 strcpy(buf, val); | |
190 return true; | |
191 } | |
192 if (len > 0) buf[0] = 0; // return a null string | |
193 return false; | |
194 } | |
195 | |
196 | |
197 // Return true if user is running as root. | |
198 | |
199 bool os::have_special_privileges() { | |
200 static bool init = false; | |
201 static bool privileges = false; | |
202 if (!init) { | |
203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
204 init = true; | |
205 } | |
206 return privileges; | |
207 } | |
208 | |
209 | |
210 | |
211 // Cpu architecture string | |
212 #if defined(ZERO) | |
213 static char cpu_arch[] = ZERO_LIBARCH; | |
214 #elif defined(IA64) | |
215 static char cpu_arch[] = "ia64"; | |
216 #elif defined(IA32) | |
217 static char cpu_arch[] = "i386"; | |
218 #elif defined(AMD64) | |
219 static char cpu_arch[] = "amd64"; | |
220 #elif defined(ARM) | |
221 static char cpu_arch[] = "arm"; | |
222 #elif defined(PPC) | |
223 static char cpu_arch[] = "ppc"; | |
224 #elif defined(SPARC) | |
225 # ifdef _LP64 | |
226 static char cpu_arch[] = "sparcv9"; | |
227 # else | |
228 static char cpu_arch[] = "sparc"; | |
229 # endif | |
230 #else | |
231 #error Add appropriate cpu_arch setting | |
232 #endif | |
233 | |
4846 | 234 // Compiler variant |
235 #ifdef COMPILER2 | |
236 #define COMPILER_VARIANT "server" | |
237 #else | |
238 #define COMPILER_VARIANT "client" | |
239 #endif | |
3960 | 240 |
6918 | 241 |
3960 | 242 void os::Bsd::initialize_system_info() { |
243 int mib[2]; | |
244 size_t len; | |
245 int cpu_val; | |
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246 julong mem_val; |
3960 | 247 |
248 /* get processors count via hw.ncpus sysctl */ | |
249 mib[0] = CTL_HW; | |
250 mib[1] = HW_NCPU; | |
251 len = sizeof(cpu_val); | |
252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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253 assert(len == sizeof(cpu_val), "unexpected data size"); |
3960 | 254 set_processor_count(cpu_val); |
255 } | |
256 else { | |
257 set_processor_count(1); // fallback | |
258 } | |
259 | |
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260 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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261 * since it returns a 64 bit value) |
3960 | 262 */ |
263 mib[0] = CTL_HW; | |
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264 |
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265 #if defined (HW_MEMSIZE) // Apple |
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266 mib[1] = HW_MEMSIZE; |
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267 #elif defined(HW_PHYSMEM) // Most of BSD |
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268 mib[1] = HW_PHYSMEM; |
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269 #elif defined(HW_REALMEM) // Old FreeBSD |
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270 mib[1] = HW_REALMEM; |
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271 #else |
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272 #error No ways to get physmem |
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273 #endif |
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274 |
3960 | 275 len = sizeof(mem_val); |
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276 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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277 assert(len == sizeof(mem_val), "unexpected data size"); |
3960 | 278 _physical_memory = mem_val; |
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279 } else { |
3960 | 280 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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281 } |
3960 | 282 |
283 #ifdef __OpenBSD__ | |
284 { | |
285 // limit _physical_memory memory view on OpenBSD since | |
286 // datasize rlimit restricts us anyway. | |
287 struct rlimit limits; | |
288 getrlimit(RLIMIT_DATA, &limits); | |
289 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
290 } | |
291 #endif | |
292 } | |
293 | |
4006 | 294 #ifdef __APPLE__ |
295 static const char *get_home() { | |
296 const char *home_dir = ::getenv("HOME"); | |
297 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
298 struct passwd *passwd_info = getpwuid(geteuid()); | |
299 if (passwd_info != NULL) { | |
300 home_dir = passwd_info->pw_dir; | |
301 } | |
302 } | |
303 | |
304 return home_dir; | |
305 } | |
306 #endif | |
307 | |
3960 | 308 void os::init_system_properties_values() { |
309 // char arch[12]; | |
310 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
311 | |
312 // The next steps are taken in the product version: | |
313 // | |
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314 // Obtain the JAVA_HOME value from the location of libjvm.so. |
3960 | 315 // This library should be located at: |
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316 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
3960 | 317 // |
318 // If "/jre/lib/" appears at the right place in the path, then we | |
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319 // assume libjvm.so is installed in a JDK and we use this path. |
3960 | 320 // |
321 // Otherwise exit with message: "Could not create the Java virtual machine." | |
322 // | |
323 // The following extra steps are taken in the debugging version: | |
324 // | |
325 // If "/jre/lib/" does NOT appear at the right place in the path | |
326 // instead of exit check for $JAVA_HOME environment variable. | |
327 // | |
328 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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329 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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330 // it looks like libjvm.so is installed there |
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331 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
3960 | 332 // |
333 // Otherwise exit. | |
334 // | |
335 // Important note: if the location of libjvm.so changes this | |
336 // code needs to be changed accordingly. | |
337 | |
338 // The next few definitions allow the code to be verbatim: | |
6197 | 339 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
3960 | 340 #define getenv(n) ::getenv(n) |
341 | |
342 /* | |
343 * See ld(1): | |
344 * The linker uses the following search paths to locate required | |
345 * shared libraries: | |
346 * 1: ... | |
347 * ... | |
348 * 7: The default directories, normally /lib and /usr/lib. | |
349 */ | |
350 #ifndef DEFAULT_LIBPATH | |
351 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
352 #endif | |
353 | |
354 #define EXTENSIONS_DIR "/lib/ext" | |
355 #define ENDORSED_DIR "/lib/endorsed" | |
356 #define REG_DIR "/usr/java/packages" | |
357 | |
4006 | 358 #ifdef __APPLE__ |
359 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
360 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
361 const char *user_home_dir = get_home(); | |
362 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
363 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
364 sizeof(SYS_EXTENSIONS_DIRS); | |
365 #endif | |
366 | |
3960 | 367 { |
368 /* sysclasspath, java_home, dll_dir */ | |
369 { | |
370 char *home_path; | |
371 char *dll_path; | |
372 char *pslash; | |
373 char buf[MAXPATHLEN]; | |
374 os::jvm_path(buf, sizeof(buf)); | |
375 | |
376 // Found the full path to libjvm.so. | |
377 // Now cut the path to <java_home>/jre if we can. | |
378 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
379 pslash = strrchr(buf, '/'); | |
380 if (pslash != NULL) | |
381 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
382 dll_path = malloc(strlen(buf) + 1); | |
383 if (dll_path == NULL) | |
384 return; | |
385 strcpy(dll_path, buf); | |
386 Arguments::set_dll_dir(dll_path); | |
387 | |
388 if (pslash != NULL) { | |
389 pslash = strrchr(buf, '/'); | |
390 if (pslash != NULL) { | |
4006 | 391 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
392 #ifndef __APPLE__ | |
3960 | 393 pslash = strrchr(buf, '/'); |
394 if (pslash != NULL) | |
395 *pslash = '\0'; /* get rid of /lib */ | |
4006 | 396 #endif |
3960 | 397 } |
398 } | |
399 | |
400 home_path = malloc(strlen(buf) + 1); | |
401 if (home_path == NULL) | |
402 return; | |
403 strcpy(home_path, buf); | |
404 Arguments::set_java_home(home_path); | |
405 | |
406 if (!set_boot_path('/', ':')) | |
407 return; | |
408 } | |
409 | |
410 /* | |
411 * Where to look for native libraries | |
412 * | |
413 * Note: Due to a legacy implementation, most of the library path | |
414 * is set in the launcher. This was to accomodate linking restrictions | |
415 * on legacy Bsd implementations (which are no longer supported). | |
416 * Eventually, all the library path setting will be done here. | |
417 * | |
418 * However, to prevent the proliferation of improperly built native | |
419 * libraries, the new path component /usr/java/packages is added here. | |
420 * Eventually, all the library path setting will be done here. | |
421 */ | |
422 { | |
423 char *ld_library_path; | |
424 | |
425 /* | |
426 * Construct the invariant part of ld_library_path. Note that the | |
427 * space for the colon and the trailing null are provided by the | |
428 * nulls included by the sizeof operator (so actually we allocate | |
429 * a byte more than necessary). | |
430 */ | |
4006 | 431 #ifdef __APPLE__ |
432 ld_library_path = (char *) malloc(system_ext_size); | |
433 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
434 #else | |
3960 | 435 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
436 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
437 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
4006 | 438 #endif |
3960 | 439 |
440 /* | |
441 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
442 * should always exist (until the legacy problem cited above is | |
443 * addressed). | |
444 */ | |
445 #ifdef __APPLE__ | |
4006 | 446 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
447 char *l = getenv("JAVA_LIBRARY_PATH"); | |
448 if (l != NULL) { | |
449 char *t = ld_library_path; | |
450 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
451 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
452 sprintf(ld_library_path, "%s:%s", l, t); | |
453 free(t); | |
454 } | |
455 | |
3960 | 456 char *v = getenv("DYLD_LIBRARY_PATH"); |
457 #else | |
458 char *v = getenv("LD_LIBRARY_PATH"); | |
459 #endif | |
460 if (v != NULL) { | |
461 char *t = ld_library_path; | |
462 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
463 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
464 sprintf(ld_library_path, "%s:%s", v, t); | |
4006 | 465 free(t); |
3960 | 466 } |
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467 |
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468 #ifdef __APPLE__ |
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469 // Apple's Java6 has "." at the beginning of java.library.path. |
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470 // OpenJDK on Windows has "." at the end of java.library.path. |
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471 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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472 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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473 // "." is appended to the end of java.library.path. Yes, this |
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474 // could cause a change in behavior, but Apple's Java6 behavior |
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475 // can be achieved by putting "." at the beginning of the |
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476 // JAVA_LIBRARY_PATH environment variable. |
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477 { |
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478 char *t = ld_library_path; |
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479 // that's +3 for appending ":." and the trailing '\0' |
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480 ld_library_path = (char *) malloc(strlen(t) + 3); |
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481 sprintf(ld_library_path, "%s:%s", t, "."); |
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482 free(t); |
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483 } |
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484 #endif |
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485 |
3960 | 486 Arguments::set_library_path(ld_library_path); |
487 } | |
488 | |
489 /* | |
490 * Extensions directories. | |
491 * | |
492 * Note that the space for the colon and the trailing null are provided | |
493 * by the nulls included by the sizeof operator (so actually one byte more | |
494 * than necessary is allocated). | |
495 */ | |
496 { | |
4006 | 497 #ifdef __APPLE__ |
498 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
499 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
500 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
501 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
502 #else | |
3960 | 503 char *buf = malloc(strlen(Arguments::get_java_home()) + |
504 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
505 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
506 Arguments::get_java_home()); | |
4006 | 507 #endif |
508 | |
3960 | 509 Arguments::set_ext_dirs(buf); |
510 } | |
511 | |
512 /* Endorsed standards default directory. */ | |
513 { | |
514 char * buf; | |
515 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
516 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
517 Arguments::set_endorsed_dirs(buf); | |
518 } | |
519 } | |
520 | |
4006 | 521 #ifdef __APPLE__ |
522 #undef SYS_EXTENSIONS_DIR | |
523 #endif | |
3960 | 524 #undef malloc |
525 #undef getenv | |
526 #undef EXTENSIONS_DIR | |
527 #undef ENDORSED_DIR | |
528 | |
529 // Done | |
530 return; | |
531 } | |
532 | |
533 //////////////////////////////////////////////////////////////////////////////// | |
534 // breakpoint support | |
535 | |
536 void os::breakpoint() { | |
537 BREAKPOINT; | |
538 } | |
539 | |
540 extern "C" void breakpoint() { | |
541 // use debugger to set breakpoint here | |
542 } | |
543 | |
544 //////////////////////////////////////////////////////////////////////////////// | |
545 // signal support | |
546 | |
547 debug_only(static bool signal_sets_initialized = false); | |
548 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
549 | |
550 bool os::Bsd::is_sig_ignored(int sig) { | |
551 struct sigaction oact; | |
552 sigaction(sig, (struct sigaction*)NULL, &oact); | |
553 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
554 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
555 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
556 return true; | |
557 else | |
558 return false; | |
559 } | |
560 | |
561 void os::Bsd::signal_sets_init() { | |
562 // Should also have an assertion stating we are still single-threaded. | |
563 assert(!signal_sets_initialized, "Already initialized"); | |
564 // Fill in signals that are necessarily unblocked for all threads in | |
565 // the VM. Currently, we unblock the following signals: | |
566 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
567 // by -Xrs (=ReduceSignalUsage)); | |
568 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
569 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
570 // the dispositions or masks wrt these signals. | |
571 // Programs embedding the VM that want to use the above signals for their | |
572 // own purposes must, at this time, use the "-Xrs" option to prevent | |
573 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
574 // (See bug 4345157, and other related bugs). | |
575 // In reality, though, unblocking these signals is really a nop, since | |
576 // these signals are not blocked by default. | |
577 sigemptyset(&unblocked_sigs); | |
578 sigemptyset(&allowdebug_blocked_sigs); | |
579 sigaddset(&unblocked_sigs, SIGILL); | |
580 sigaddset(&unblocked_sigs, SIGSEGV); | |
581 sigaddset(&unblocked_sigs, SIGBUS); | |
582 sigaddset(&unblocked_sigs, SIGFPE); | |
583 sigaddset(&unblocked_sigs, SR_signum); | |
584 | |
585 if (!ReduceSignalUsage) { | |
586 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
587 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
588 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
589 } | |
590 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
591 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
592 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
593 } | |
594 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
595 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
596 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
597 } | |
598 } | |
599 // Fill in signals that are blocked by all but the VM thread. | |
600 sigemptyset(&vm_sigs); | |
601 if (!ReduceSignalUsage) | |
602 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
603 debug_only(signal_sets_initialized = true); | |
604 | |
605 } | |
606 | |
607 // These are signals that are unblocked while a thread is running Java. | |
608 // (For some reason, they get blocked by default.) | |
609 sigset_t* os::Bsd::unblocked_signals() { | |
610 assert(signal_sets_initialized, "Not initialized"); | |
611 return &unblocked_sigs; | |
612 } | |
613 | |
614 // These are the signals that are blocked while a (non-VM) thread is | |
615 // running Java. Only the VM thread handles these signals. | |
616 sigset_t* os::Bsd::vm_signals() { | |
617 assert(signal_sets_initialized, "Not initialized"); | |
618 return &vm_sigs; | |
619 } | |
620 | |
621 // These are signals that are blocked during cond_wait to allow debugger in | |
622 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
623 assert(signal_sets_initialized, "Not initialized"); | |
624 return &allowdebug_blocked_sigs; | |
625 } | |
626 | |
627 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
628 | |
629 //Save caller's signal mask before setting VM signal mask | |
630 sigset_t caller_sigmask; | |
631 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
632 | |
633 OSThread* osthread = thread->osthread(); | |
634 osthread->set_caller_sigmask(caller_sigmask); | |
635 | |
636 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
637 | |
638 if (!ReduceSignalUsage) { | |
639 if (thread->is_VM_thread()) { | |
640 // Only the VM thread handles BREAK_SIGNAL ... | |
641 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
642 } else { | |
643 // ... all other threads block BREAK_SIGNAL | |
644 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
645 } | |
646 } | |
647 } | |
648 | |
649 | |
650 ////////////////////////////////////////////////////////////////////////////// | |
651 // create new thread | |
652 | |
653 // check if it's safe to start a new thread | |
654 static bool _thread_safety_check(Thread* thread) { | |
6918 | 655 return true; |
3960 | 656 } |
657 | |
4006 | 658 #ifdef __APPLE__ |
659 // library handle for calling objc_registerThreadWithCollector() | |
660 // without static linking to the libobjc library | |
661 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
662 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
663 typedef void (*objc_registerThreadWithCollector_t)(); | |
664 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
665 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
666 #endif | |
667 | |
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668 #ifdef __APPLE__ |
12095 | 669 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { |
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670 // Additional thread_id used to correlate threads in SA |
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671 thread_identifier_info_data_t m_ident_info; |
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672 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
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673 |
12095 | 674 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, |
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675 (thread_info_t) &m_ident_info, &count); |
12095 | 676 |
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677 return m_ident_info.thread_id; |
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678 } |
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679 #endif |
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680 |
3960 | 681 // Thread start routine for all newly created threads |
682 static void *java_start(Thread *thread) { | |
683 // Try to randomize the cache line index of hot stack frames. | |
684 // This helps when threads of the same stack traces evict each other's | |
685 // cache lines. The threads can be either from the same JVM instance, or | |
686 // from different JVM instances. The benefit is especially true for | |
687 // processors with hyperthreading technology. | |
688 static int counter = 0; | |
689 int pid = os::current_process_id(); | |
690 alloca(((pid ^ counter++) & 7) * 128); | |
691 | |
692 ThreadLocalStorage::set_thread(thread); | |
693 | |
694 OSThread* osthread = thread->osthread(); | |
695 Monitor* sync = osthread->startThread_lock(); | |
696 | |
697 // non floating stack BsdThreads needs extra check, see above | |
698 if (!_thread_safety_check(thread)) { | |
699 // notify parent thread | |
700 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
701 osthread->set_state(ZOMBIE); | |
702 sync->notify_all(); | |
703 return NULL; | |
704 } | |
705 | |
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706 osthread->set_thread_id(os::Bsd::gettid()); |
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707 |
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708 #ifdef __APPLE__ |
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709 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
12095 | 710 guarantee(unique_thread_id != 0, "unique thread id was not found"); |
711 osthread->set_unique_thread_id(unique_thread_id); | |
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712 #endif |
3960 | 713 // initialize signal mask for this thread |
714 os::Bsd::hotspot_sigmask(thread); | |
715 | |
716 // initialize floating point control register | |
717 os::Bsd::init_thread_fpu_state(); | |
718 | |
4006 | 719 #ifdef __APPLE__ |
720 // register thread with objc gc | |
721 if (objc_registerThreadWithCollectorFunction != NULL) { | |
722 objc_registerThreadWithCollectorFunction(); | |
723 } | |
724 #endif | |
725 | |
3960 | 726 // handshaking with parent thread |
727 { | |
728 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
729 | |
730 // notify parent thread | |
731 osthread->set_state(INITIALIZED); | |
732 sync->notify_all(); | |
733 | |
734 // wait until os::start_thread() | |
735 while (osthread->get_state() == INITIALIZED) { | |
736 sync->wait(Mutex::_no_safepoint_check_flag); | |
737 } | |
738 } | |
739 | |
740 // call one more level start routine | |
741 thread->run(); | |
742 | |
743 return 0; | |
744 } | |
745 | |
746 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
747 assert(thread->osthread() == NULL, "caller responsible"); | |
748 | |
749 // Allocate the OSThread object | |
750 OSThread* osthread = new OSThread(NULL, NULL); | |
751 if (osthread == NULL) { | |
752 return false; | |
753 } | |
754 | |
755 // set the correct thread state | |
756 osthread->set_thread_type(thr_type); | |
757 | |
758 // Initial state is ALLOCATED but not INITIALIZED | |
759 osthread->set_state(ALLOCATED); | |
760 | |
761 thread->set_osthread(osthread); | |
762 | |
763 // init thread attributes | |
764 pthread_attr_t attr; | |
765 pthread_attr_init(&attr); | |
766 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
767 | |
768 // stack size | |
769 if (os::Bsd::supports_variable_stack_size()) { | |
770 // calculate stack size if it's not specified by caller | |
771 if (stack_size == 0) { | |
772 stack_size = os::Bsd::default_stack_size(thr_type); | |
773 | |
774 switch (thr_type) { | |
775 case os::java_thread: | |
776 // Java threads use ThreadStackSize which default value can be | |
777 // changed with the flag -Xss | |
778 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
779 stack_size = JavaThread::stack_size_at_create(); | |
780 break; | |
781 case os::compiler_thread: | |
782 if (CompilerThreadStackSize > 0) { | |
783 stack_size = (size_t)(CompilerThreadStackSize * K); | |
784 break; | |
785 } // else fall through: | |
786 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
787 case os::vm_thread: | |
788 case os::pgc_thread: | |
789 case os::cgc_thread: | |
790 case os::watcher_thread: | |
791 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
792 break; | |
793 } | |
794 } | |
795 | |
796 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
797 pthread_attr_setstacksize(&attr, stack_size); | |
798 } else { | |
799 // let pthread_create() pick the default value. | |
800 } | |
801 | |
802 ThreadState state; | |
803 | |
804 { | |
805 pthread_t tid; | |
806 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
807 | |
808 pthread_attr_destroy(&attr); | |
809 | |
810 if (ret != 0) { | |
811 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
812 perror("pthread_create()"); | |
813 } | |
814 // Need to clean up stuff we've allocated so far | |
815 thread->set_osthread(NULL); | |
816 delete osthread; | |
817 return false; | |
818 } | |
819 | |
820 // Store pthread info into the OSThread | |
821 osthread->set_pthread_id(tid); | |
822 | |
823 // Wait until child thread is either initialized or aborted | |
824 { | |
825 Monitor* sync_with_child = osthread->startThread_lock(); | |
826 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
827 while ((state = osthread->get_state()) == ALLOCATED) { | |
828 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
829 } | |
830 } | |
831 | |
832 } | |
833 | |
834 // Aborted due to thread limit being reached | |
835 if (state == ZOMBIE) { | |
836 thread->set_osthread(NULL); | |
837 delete osthread; | |
838 return false; | |
839 } | |
840 | |
841 // The thread is returned suspended (in state INITIALIZED), | |
842 // and is started higher up in the call chain | |
843 assert(state == INITIALIZED, "race condition"); | |
844 return true; | |
845 } | |
846 | |
847 ///////////////////////////////////////////////////////////////////////////// | |
848 // attach existing thread | |
849 | |
850 // bootstrap the main thread | |
851 bool os::create_main_thread(JavaThread* thread) { | |
852 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
853 return create_attached_thread(thread); | |
854 } | |
855 | |
856 bool os::create_attached_thread(JavaThread* thread) { | |
857 #ifdef ASSERT | |
858 thread->verify_not_published(); | |
859 #endif | |
860 | |
861 // Allocate the OSThread object | |
862 OSThread* osthread = new OSThread(NULL, NULL); | |
863 | |
864 if (osthread == NULL) { | |
865 return false; | |
866 } | |
867 | |
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868 osthread->set_thread_id(os::Bsd::gettid()); |
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869 |
3960 | 870 // Store pthread info into the OSThread |
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871 #ifdef __APPLE__ |
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872 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
12095 | 873 guarantee(unique_thread_id != 0, "just checking"); |
874 osthread->set_unique_thread_id(unique_thread_id); | |
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875 #endif |
3960 | 876 osthread->set_pthread_id(::pthread_self()); |
877 | |
878 // initialize floating point control register | |
879 os::Bsd::init_thread_fpu_state(); | |
880 | |
881 // Initial thread state is RUNNABLE | |
882 osthread->set_state(RUNNABLE); | |
883 | |
884 thread->set_osthread(osthread); | |
885 | |
886 // initialize signal mask for this thread | |
887 // and save the caller's signal mask | |
888 os::Bsd::hotspot_sigmask(thread); | |
889 | |
890 return true; | |
891 } | |
892 | |
893 void os::pd_start_thread(Thread* thread) { | |
894 OSThread * osthread = thread->osthread(); | |
895 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
896 Monitor* sync_with_child = osthread->startThread_lock(); | |
897 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
898 sync_with_child->notify(); | |
899 } | |
900 | |
901 // Free Bsd resources related to the OSThread | |
902 void os::free_thread(OSThread* osthread) { | |
903 assert(osthread != NULL, "osthread not set"); | |
904 | |
905 if (Thread::current()->osthread() == osthread) { | |
906 // Restore caller's signal mask | |
907 sigset_t sigmask = osthread->caller_sigmask(); | |
908 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
909 } | |
910 | |
911 delete osthread; | |
912 } | |
913 | |
914 ////////////////////////////////////////////////////////////////////////////// | |
915 // thread local storage | |
916 | |
917 int os::allocate_thread_local_storage() { | |
918 pthread_key_t key; | |
919 int rslt = pthread_key_create(&key, NULL); | |
920 assert(rslt == 0, "cannot allocate thread local storage"); | |
921 return (int)key; | |
922 } | |
923 | |
924 // Note: This is currently not used by VM, as we don't destroy TLS key | |
925 // on VM exit. | |
926 void os::free_thread_local_storage(int index) { | |
927 int rslt = pthread_key_delete((pthread_key_t)index); | |
928 assert(rslt == 0, "invalid index"); | |
929 } | |
930 | |
931 void os::thread_local_storage_at_put(int index, void* value) { | |
932 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
933 assert(rslt == 0, "pthread_setspecific failed"); | |
934 } | |
935 | |
936 extern "C" Thread* get_thread() { | |
937 return ThreadLocalStorage::thread(); | |
938 } | |
939 | |
940 | |
941 //////////////////////////////////////////////////////////////////////////////// | |
942 // time support | |
943 | |
944 // Time since start-up in seconds to a fine granularity. | |
945 // Used by VMSelfDestructTimer and the MemProfiler. | |
946 double os::elapsedTime() { | |
947 | |
948 return (double)(os::elapsed_counter()) * 0.000001; | |
949 } | |
950 | |
951 jlong os::elapsed_counter() { | |
952 timeval time; | |
953 int status = gettimeofday(&time, NULL); | |
954 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
955 } | |
956 | |
957 jlong os::elapsed_frequency() { | |
958 return (1000 * 1000); | |
959 } | |
960 | |
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961 bool os::supports_vtime() { return true; } |
3960 | 962 bool os::enable_vtime() { return false; } |
963 bool os::vtime_enabled() { return false; } | |
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964 |
3960 | 965 double os::elapsedVTime() { |
966 // better than nothing, but not much | |
967 return elapsedTime(); | |
968 } | |
969 | |
970 jlong os::javaTimeMillis() { | |
971 timeval time; | |
972 int status = gettimeofday(&time, NULL); | |
973 assert(status != -1, "bsd error"); | |
974 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
975 } | |
976 | |
977 #ifndef CLOCK_MONOTONIC | |
978 #define CLOCK_MONOTONIC (1) | |
979 #endif | |
980 | |
981 #ifdef __APPLE__ | |
982 void os::Bsd::clock_init() { | |
983 // XXXDARWIN: Investigate replacement monotonic clock | |
984 } | |
6918 | 985 #else |
3960 | 986 void os::Bsd::clock_init() { |
987 struct timespec res; | |
988 struct timespec tp; | |
989 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
990 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
991 // yes, monotonic clock is supported | |
992 _clock_gettime = ::clock_gettime; | |
993 } | |
994 } | |
995 #endif | |
996 | |
997 | |
998 jlong os::javaTimeNanos() { | |
999 if (Bsd::supports_monotonic_clock()) { | |
1000 struct timespec tp; | |
1001 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1002 assert(status == 0, "gettime error"); | |
1003 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1004 return result; | |
1005 } else { | |
1006 timeval time; | |
1007 int status = gettimeofday(&time, NULL); | |
1008 assert(status != -1, "bsd error"); | |
1009 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1010 return 1000 * usecs; | |
1011 } | |
1012 } | |
1013 | |
1014 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1015 if (Bsd::supports_monotonic_clock()) { | |
1016 info_ptr->max_value = ALL_64_BITS; | |
1017 | |
1018 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1019 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1020 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1021 } else { | |
1022 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1023 info_ptr->max_value = ALL_64_BITS; | |
1024 | |
1025 // gettimeofday is a real time clock so it skips | |
1026 info_ptr->may_skip_backward = true; | |
1027 info_ptr->may_skip_forward = true; | |
1028 } | |
1029 | |
1030 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1031 } | |
1032 | |
1033 // Return the real, user, and system times in seconds from an | |
1034 // arbitrary fixed point in the past. | |
1035 bool os::getTimesSecs(double* process_real_time, | |
1036 double* process_user_time, | |
1037 double* process_system_time) { | |
1038 struct tms ticks; | |
1039 clock_t real_ticks = times(&ticks); | |
1040 | |
1041 if (real_ticks == (clock_t) (-1)) { | |
1042 return false; | |
1043 } else { | |
1044 double ticks_per_second = (double) clock_tics_per_sec; | |
1045 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1046 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1047 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1048 | |
1049 return true; | |
1050 } | |
1051 } | |
1052 | |
1053 | |
1054 char * os::local_time_string(char *buf, size_t buflen) { | |
1055 struct tm t; | |
1056 time_t long_time; | |
1057 time(&long_time); | |
1058 localtime_r(&long_time, &t); | |
1059 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1060 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1061 t.tm_hour, t.tm_min, t.tm_sec); | |
1062 return buf; | |
1063 } | |
1064 | |
1065 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1066 return localtime_r(clock, res); | |
1067 } | |
1068 | |
1069 //////////////////////////////////////////////////////////////////////////////// | |
1070 // runtime exit support | |
1071 | |
1072 // Note: os::shutdown() might be called very early during initialization, or | |
1073 // called from signal handler. Before adding something to os::shutdown(), make | |
1074 // sure it is async-safe and can handle partially initialized VM. | |
1075 void os::shutdown() { | |
1076 | |
1077 // allow PerfMemory to attempt cleanup of any persistent resources | |
1078 perfMemory_exit(); | |
1079 | |
1080 // needs to remove object in file system | |
1081 AttachListener::abort(); | |
1082 | |
1083 // flush buffered output, finish log files | |
1084 ostream_abort(); | |
1085 | |
1086 // Check for abort hook | |
1087 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1088 if (abort_hook != NULL) { | |
1089 abort_hook(); | |
1090 } | |
1091 | |
1092 } | |
1093 | |
1094 // Note: os::abort() might be called very early during initialization, or | |
1095 // called from signal handler. Before adding something to os::abort(), make | |
1096 // sure it is async-safe and can handle partially initialized VM. | |
1097 void os::abort(bool dump_core) { | |
1098 os::shutdown(); | |
1099 if (dump_core) { | |
1100 #ifndef PRODUCT | |
1101 fdStream out(defaultStream::output_fd()); | |
1102 out.print_raw("Current thread is "); | |
1103 char buf[16]; | |
1104 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1105 out.print_raw_cr(buf); | |
1106 out.print_raw_cr("Dumping core ..."); | |
1107 #endif | |
1108 ::abort(); // dump core | |
1109 } | |
1110 | |
1111 ::exit(1); | |
1112 } | |
1113 | |
1114 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1115 void os::die() { | |
1116 // _exit() on BsdThreads only kills current thread | |
1117 ::abort(); | |
1118 } | |
1119 | |
1120 // unused on bsd for now. | |
1121 void os::set_error_file(const char *logfile) {} | |
1122 | |
1123 | |
1124 // This method is a copy of JDK's sysGetLastErrorString | |
1125 // from src/solaris/hpi/src/system_md.c | |
1126 | |
1127 size_t os::lasterror(char *buf, size_t len) { | |
1128 | |
1129 if (errno == 0) return 0; | |
1130 | |
1131 const char *s = ::strerror(errno); | |
1132 size_t n = ::strlen(s); | |
1133 if (n >= len) { | |
1134 n = len - 1; | |
1135 } | |
1136 ::strncpy(buf, s, n); | |
1137 buf[n] = '\0'; | |
1138 return n; | |
1139 } | |
1140 | |
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1141 // Information of current thread in variety of formats |
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1142 pid_t os::Bsd::gettid() { |
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1143 int retval = -1; |
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1144 |
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1145 #ifdef __APPLE__ //XNU kernel |
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1146 // despite the fact mach port is actually not a thread id use it |
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1147 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 |
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1148 retval = ::pthread_mach_thread_np(::pthread_self()); |
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1149 guarantee(retval != 0, "just checking"); |
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1150 return retval; |
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1151 |
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1152 #elif __FreeBSD__ |
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1153 retval = syscall(SYS_thr_self); |
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1154 #elif __OpenBSD__ |
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1155 retval = syscall(SYS_getthrid); |
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1156 #elif __NetBSD__ |
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1157 retval = (pid_t) syscall(SYS__lwp_self); |
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1158 #endif |
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1159 |
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1160 if (retval == -1) { |
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1161 return getpid(); |
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1162 } |
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1163 } |
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1164 |
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1165 intx os::current_thread_id() { |
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1166 #ifdef __APPLE__ |
12095 | 1167 return (intx)::pthread_mach_thread_np(::pthread_self()); |
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1168 #else |
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1169 return (intx)::pthread_self(); |
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1170 #endif |
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1171 } |
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1172 |
3960 | 1173 int os::current_process_id() { |
1174 | |
1175 // Under the old bsd thread library, bsd gives each thread | |
1176 // its own process id. Because of this each thread will return | |
1177 // a different pid if this method were to return the result | |
1178 // of getpid(2). Bsd provides no api that returns the pid | |
1179 // of the launcher thread for the vm. This implementation | |
1180 // returns a unique pid, the pid of the launcher thread | |
1181 // that starts the vm 'process'. | |
1182 | |
1183 // Under the NPTL, getpid() returns the same pid as the | |
1184 // launcher thread rather than a unique pid per thread. | |
1185 // Use gettid() if you want the old pre NPTL behaviour. | |
1186 | |
1187 // if you are looking for the result of a call to getpid() that | |
1188 // returns a unique pid for the calling thread, then look at the | |
1189 // OSThread::thread_id() method in osThread_bsd.hpp file | |
1190 | |
1191 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1192 } | |
1193 | |
1194 // DLL functions | |
1195 | |
1196 #define JNI_LIB_PREFIX "lib" | |
1197 #ifdef __APPLE__ | |
1198 #define JNI_LIB_SUFFIX ".dylib" | |
1199 #else | |
1200 #define JNI_LIB_SUFFIX ".so" | |
1201 #endif | |
1202 | |
1203 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
1204 | |
1205 // This must be hard coded because it's the system's temporary | |
1206 // directory not the java application's temp directory, ala java.io.tmpdir. | |
4006 | 1207 #ifdef __APPLE__ |
1208 // macosx has a secure per-user temporary directory | |
1209 char temp_path_storage[PATH_MAX]; | |
1210 const char* os::get_temp_directory() { | |
1211 static char *temp_path = NULL; | |
1212 if (temp_path == NULL) { | |
1213 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
1214 if (pathSize == 0 || pathSize > PATH_MAX) { | |
1215 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
1216 } | |
1217 temp_path = temp_path_storage; | |
1218 } | |
1219 return temp_path; | |
1220 } | |
1221 #else /* __APPLE__ */ | |
3960 | 1222 const char* os::get_temp_directory() { return "/tmp"; } |
4006 | 1223 #endif /* __APPLE__ */ |
3960 | 1224 |
1225 static bool file_exists(const char* filename) { | |
1226 struct stat statbuf; | |
1227 if (filename == NULL || strlen(filename) == 0) { | |
1228 return false; | |
1229 } | |
1230 return os::stat(filename, &statbuf) == 0; | |
1231 } | |
1232 | |
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1233 bool os::dll_build_name(char* buffer, size_t buflen, |
3960 | 1234 const char* pname, const char* fname) { |
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1235 bool retval = false; |
3960 | 1236 // Copied from libhpi |
1237 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1238 | |
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1239 // Return error on buffer overflow. |
3960 | 1240 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1241 return retval; |
3960 | 1242 } |
1243 | |
1244 if (pnamelen == 0) { | |
1245 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1246 retval = true; |
3960 | 1247 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1248 int n; | |
1249 char** pelements = split_path(pname, &n); | |
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1250 if (pelements == NULL) { |
9062 | 1251 return false; |
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1252 } |
3960 | 1253 for (int i = 0 ; i < n ; i++) { |
1254 // Really shouldn't be NULL, but check can't hurt | |
1255 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1256 continue; // skip the empty path values | |
1257 } | |
1258 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
1259 pelements[i], fname); | |
1260 if (file_exists(buffer)) { | |
6966
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1261 retval = true; |
3960 | 1262 break; |
1263 } | |
1264 } | |
1265 // release the storage | |
1266 for (int i = 0 ; i < n ; i++) { | |
1267 if (pelements[i] != NULL) { | |
6197 | 1268 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
3960 | 1269 } |
1270 } | |
1271 if (pelements != NULL) { | |
6197 | 1272 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
3960 | 1273 } |
1274 } else { | |
1275 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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|
1276 retval = true; |
3960 | 1277 } |
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1278 return retval; |
3960 | 1279 } |
1280 | |
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|
1281 // check if addr is inside libjvm.so |
3960 | 1282 bool os::address_is_in_vm(address addr) { |
1283 static address libjvm_base_addr; | |
1284 Dl_info dlinfo; | |
1285 | |
1286 if (libjvm_base_addr == NULL) { | |
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1287 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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1288 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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|
1289 } |
3960 | 1290 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1291 } | |
1292 | |
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1293 if (dladdr((void *)addr, &dlinfo) != 0) { |
3960 | 1294 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1295 } | |
1296 | |
1297 return false; | |
1298 } | |
1299 | |
6258 | 1300 |
1301 #define MACH_MAXSYMLEN 256 | |
1302 | |
3960 | 1303 bool os::dll_address_to_function_name(address addr, char *buf, |
1304 int buflen, int *offset) { | |
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1305 // buf is not optional, but offset is optional |
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1306 assert(buf != NULL, "sanity check"); |
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|
1307 |
3960 | 1308 Dl_info dlinfo; |
6258 | 1309 char localbuf[MACH_MAXSYMLEN]; |
1310 | |
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1311 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1312 // see if we have a matching symbol |
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1313 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
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1314 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
3960 | 1315 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
1316 } | |
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1317 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
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|
1318 return true; |
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|
1319 } |
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|
1320 // no matching symbol so try for just file info |
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1321 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
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1322 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
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1323 buf, buflen, offset, dlinfo.dli_fname)) { |
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|
1324 return true; |
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|
1325 } |
3960 | 1326 } |
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|
1327 |
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|
1328 // Handle non-dynamic manually: |
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|
1329 if (dlinfo.dli_fbase != NULL && |
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|
1330 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, |
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1331 dlinfo.dli_fbase)) { |
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1332 if (!Decoder::demangle(localbuf, buf, buflen)) { |
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|
1333 jio_snprintf(buf, buflen, "%s", localbuf); |
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|
1334 } |
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|
1335 return true; |
3960 | 1336 } |
1337 } | |
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|
1338 buf[0] = '\0'; |
3960 | 1339 if (offset != NULL) *offset = -1; |
1340 return false; | |
1341 } | |
1342 | |
1343 // ported from solaris version | |
1344 bool os::dll_address_to_library_name(address addr, char* buf, | |
1345 int buflen, int* offset) { | |
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1346 // buf is not optional, but offset is optional |
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|
1347 assert(buf != NULL, "sanity check"); |
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|
1348 |
3960 | 1349 Dl_info dlinfo; |
1350 | |
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1351 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1352 if (dlinfo.dli_fname != NULL) { |
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|
1353 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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|
1354 } |
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|
1355 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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|
1356 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1357 } |
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|
1358 return true; |
3960 | 1359 } |
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|
1360 |
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|
1361 buf[0] = '\0'; |
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|
1362 if (offset) *offset = -1; |
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|
1363 return false; |
3960 | 1364 } |
6918 | 1365 |
1366 // Loads .dll/.so and | |
1367 // in case of error it checks if .dll/.so was built for the | |
1368 // same architecture as Hotspot is running on | |
3960 | 1369 |
1370 #ifdef __APPLE__ | |
1371 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1372 void * result= ::dlopen(filename, RTLD_LAZY); | |
1373 if (result != NULL) { | |
1374 // Successful loading | |
1375 return result; | |
1376 } | |
1377 | |
1378 // Read system error message into ebuf | |
1379 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1380 ebuf[ebuflen-1]='\0'; | |
1381 | |
1382 return NULL; | |
1383 } | |
1384 #else | |
1385 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1386 { | |
1387 void * result= ::dlopen(filename, RTLD_LAZY); | |
1388 if (result != NULL) { | |
1389 // Successful loading | |
1390 return result; | |
1391 } | |
1392 | |
1393 Elf32_Ehdr elf_head; | |
1394 | |
1395 // Read system error message into ebuf | |
1396 // It may or may not be overwritten below | |
1397 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1398 ebuf[ebuflen-1]='\0'; | |
1399 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1400 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1401 | |
1402 if (diag_msg_max_length==0) { | |
1403 // No more space in ebuf for additional diagnostics message | |
1404 return NULL; | |
1405 } | |
1406 | |
1407 | |
1408 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1409 | |
1410 if (file_descriptor < 0) { | |
1411 // Can't open library, report dlerror() message | |
1412 return NULL; | |
1413 } | |
1414 | |
1415 bool failed_to_read_elf_head= | |
1416 (sizeof(elf_head)!= | |
1417 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1418 | |
1419 ::close(file_descriptor); | |
1420 if (failed_to_read_elf_head) { | |
1421 // file i/o error - report dlerror() msg | |
1422 return NULL; | |
1423 } | |
1424 | |
1425 typedef struct { | |
1426 Elf32_Half code; // Actual value as defined in elf.h | |
1427 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1428 char elf_class; // 32 or 64 bit | |
1429 char endianess; // MSB or LSB | |
1430 char* name; // String representation | |
1431 } arch_t; | |
1432 | |
1433 #ifndef EM_486 | |
1434 #define EM_486 6 /* Intel 80486 */ | |
1435 #endif | |
1436 | |
1437 #ifndef EM_MIPS_RS3_LE | |
1438 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
1439 #endif | |
1440 | |
1441 #ifndef EM_PPC64 | |
1442 #define EM_PPC64 21 /* PowerPC64 */ | |
1443 #endif | |
1444 | |
1445 #ifndef EM_S390 | |
1446 #define EM_S390 22 /* IBM System/390 */ | |
1447 #endif | |
1448 | |
1449 #ifndef EM_IA_64 | |
1450 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
1451 #endif | |
1452 | |
1453 #ifndef EM_X86_64 | |
1454 #define EM_X86_64 62 /* AMD x86-64 */ | |
1455 #endif | |
1456 | |
1457 static const arch_t arch_array[]={ | |
1458 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1459 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1460 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1461 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1462 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1463 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1464 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1465 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1466 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
1467 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1468 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1469 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1470 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1471 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1472 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1473 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
1474 }; | |
1475 | |
1476 #if (defined IA32) | |
1477 static Elf32_Half running_arch_code=EM_386; | |
1478 #elif (defined AMD64) | |
1479 static Elf32_Half running_arch_code=EM_X86_64; | |
1480 #elif (defined IA64) | |
1481 static Elf32_Half running_arch_code=EM_IA_64; | |
1482 #elif (defined __sparc) && (defined _LP64) | |
1483 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1484 #elif (defined __sparc) && (!defined _LP64) | |
1485 static Elf32_Half running_arch_code=EM_SPARC; | |
1486 #elif (defined __powerpc64__) | |
1487 static Elf32_Half running_arch_code=EM_PPC64; | |
1488 #elif (defined __powerpc__) | |
1489 static Elf32_Half running_arch_code=EM_PPC; | |
1490 #elif (defined ARM) | |
1491 static Elf32_Half running_arch_code=EM_ARM; | |
1492 #elif (defined S390) | |
1493 static Elf32_Half running_arch_code=EM_S390; | |
1494 #elif (defined ALPHA) | |
1495 static Elf32_Half running_arch_code=EM_ALPHA; | |
1496 #elif (defined MIPSEL) | |
1497 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1498 #elif (defined PARISC) | |
1499 static Elf32_Half running_arch_code=EM_PARISC; | |
1500 #elif (defined MIPS) | |
1501 static Elf32_Half running_arch_code=EM_MIPS; | |
1502 #elif (defined M68K) | |
1503 static Elf32_Half running_arch_code=EM_68K; | |
1504 #else | |
1505 #error Method os::dll_load requires that one of following is defined:\ | |
1506 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
1507 #endif | |
1508 | |
1509 // Identify compatability class for VM's architecture and library's architecture | |
1510 // Obtain string descriptions for architectures | |
1511 | |
1512 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1513 int running_arch_index=-1; | |
1514 | |
1515 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1516 if (running_arch_code == arch_array[i].code) { | |
1517 running_arch_index = i; | |
1518 } | |
1519 if (lib_arch.code == arch_array[i].code) { | |
1520 lib_arch.compat_class = arch_array[i].compat_class; | |
1521 lib_arch.name = arch_array[i].name; | |
1522 } | |
1523 } | |
1524 | |
1525 assert(running_arch_index != -1, | |
1526 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1527 if (running_arch_index == -1) { | |
1528 // Even though running architecture detection failed | |
1529 // we may still continue with reporting dlerror() message | |
1530 return NULL; | |
1531 } | |
1532 | |
1533 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1534 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1535 return NULL; | |
1536 } | |
1537 | |
1538 #ifndef S390 | |
1539 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
1540 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1541 return NULL; | |
1542 } | |
1543 #endif // !S390 | |
1544 | |
1545 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1546 if ( lib_arch.name!=NULL ) { | |
1547 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1548 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1549 lib_arch.name, arch_array[running_arch_index].name); | |
1550 } else { | |
1551 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1552 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1553 lib_arch.code, | |
1554 arch_array[running_arch_index].name); | |
1555 } | |
1556 } | |
1557 | |
1558 return NULL; | |
1559 } | |
1560 #endif /* !__APPLE__ */ | |
1561 | |
1562 // XXX: Do we need a lock around this as per Linux? | |
1563 void* os::dll_lookup(void* handle, const char* name) { | |
1564 return dlsym(handle, name); | |
1565 } | |
1566 | |
1567 | |
1568 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
1569 int fd = ::open(filename, O_RDONLY); | |
1570 if (fd == -1) { | |
1571 return false; | |
1572 } | |
1573 | |
1574 char buf[32]; | |
1575 int bytes; | |
1576 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
1577 st->print_raw(buf, bytes); | |
1578 } | |
1579 | |
1580 ::close(fd); | |
1581 | |
1582 return true; | |
1583 } | |
1584 | |
1585 void os::print_dll_info(outputStream *st) { | |
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|
1586 st->print_cr("Dynamic libraries:"); |
3960 | 1587 #ifdef RTLD_DI_LINKMAP |
11092
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|
1588 Dl_info dli; |
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1589 void *handle; |
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1590 Link_map *map; |
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1591 Link_map *p; |
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|
1592 |
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|
1593 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || |
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|
1594 dli.dli_fname == NULL) { |
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|
1595 st->print_cr("Error: Cannot print dynamic libraries."); |
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|
1596 return; |
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|
1597 } |
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|
1598 handle = dlopen(dli.dli_fname, RTLD_LAZY); |
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|
1599 if (handle == NULL) { |
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1600 st->print_cr("Error: Cannot print dynamic libraries."); |
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|
1601 return; |
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|
1602 } |
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|
1603 dlinfo(handle, RTLD_DI_LINKMAP, &map); |
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|
1604 if (map == NULL) { |
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|
1605 st->print_cr("Error: Cannot print dynamic libraries."); |
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|
1606 return; |
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|
1607 } |
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|
1608 |
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|
1609 while (map->l_prev != NULL) |
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|
1610 map = map->l_prev; |
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|
1611 |
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|
1612 while (map != NULL) { |
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|
1613 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); |
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|
1614 map = map->l_next; |
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|
1615 } |
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|
1616 |
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|
1617 dlclose(handle); |
3960 | 1618 #elif defined(__APPLE__) |
11092
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|
1619 uint32_t count; |
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|
1620 uint32_t i; |
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|
1621 |
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|
1622 count = _dyld_image_count(); |
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|
1623 for (i = 1; i < count; i++) { |
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|
1624 const char *name = _dyld_get_image_name(i); |
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|
1625 intptr_t slide = _dyld_get_image_vmaddr_slide(i); |
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|
1626 st->print_cr(PTR_FORMAT " \t%s", slide, name); |
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|
1627 } |
3960 | 1628 #else |
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|
1629 st->print_cr("Error: Cannot print dynamic libraries."); |
3960 | 1630 #endif |
1631 } | |
1632 | |
6080
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|
1633 void os::print_os_info_brief(outputStream* st) { |
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|
1634 st->print("Bsd"); |
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|
1635 |
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|
1636 os::Posix::print_uname_info(st); |
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|
1637 } |
3960 | 1638 |
1639 void os::print_os_info(outputStream* st) { | |
1640 st->print("OS:"); | |
6080
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|
1641 st->print("Bsd"); |
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|
1642 |
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|
1643 os::Posix::print_uname_info(st); |
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|
1644 |
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|
1645 os::Posix::print_rlimit_info(st); |
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|
1646 |
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|
1647 os::Posix::print_load_average(st); |
3960 | 1648 } |
1649 | |
1650 void os::pd_print_cpu_info(outputStream* st) { | |
1651 // Nothing to do for now. | |
1652 } | |
1653 | |
1654 void os::print_memory_info(outputStream* st) { | |
1655 | |
1656 st->print("Memory:"); | |
1657 st->print(" %dk page", os::vm_page_size()>>10); | |
1658 | |
1659 st->print(", physical " UINT64_FORMAT "k", | |
1660 os::physical_memory() >> 10); | |
1661 st->print("(" UINT64_FORMAT "k free)", | |
1662 os::available_memory() >> 10); | |
1663 st->cr(); | |
1664 | |
1665 // meminfo | |
1666 st->print("\n/proc/meminfo:\n"); | |
1667 _print_ascii_file("/proc/meminfo", st); | |
1668 st->cr(); | |
1669 } | |
1670 | |
1671 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
1672 // but they're the same for all the bsd arch that we support | |
1673 // and they're the same for solaris but there's no common place to put this. | |
1674 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
1675 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
1676 "ILL_COPROC", "ILL_BADSTK" }; | |
1677 | |
1678 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
1679 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
1680 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
1681 | |
1682 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
1683 | |
1684 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
1685 | |
1686 void os::print_siginfo(outputStream* st, void* siginfo) { | |
1687 st->print("siginfo:"); | |
1688 | |
1689 const int buflen = 100; | |
1690 char buf[buflen]; | |
1691 siginfo_t *si = (siginfo_t*)siginfo; | |
1692 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
1693 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
1694 st->print("si_errno=%s", buf); | |
1695 } else { | |
1696 st->print("si_errno=%d", si->si_errno); | |
1697 } | |
1698 const int c = si->si_code; | |
1699 assert(c > 0, "unexpected si_code"); | |
1700 switch (si->si_signo) { | |
1701 case SIGILL: | |
1702 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
1703 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1704 break; | |
1705 case SIGFPE: | |
1706 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
1707 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1708 break; | |
1709 case SIGSEGV: | |
1710 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
1711 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1712 break; | |
1713 case SIGBUS: | |
1714 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
1715 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1716 break; | |
1717 default: | |
1718 st->print(", si_code=%d", si->si_code); | |
1719 // no si_addr | |
1720 } | |
1721 | |
1722 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
1723 UseSharedSpaces) { | |
1724 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
1725 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
1726 st->print("\n\nError accessing class data sharing archive." \ | |
1727 " Mapped file inaccessible during execution, " \ | |
1728 " possible disk/network problem."); | |
1729 } | |
1730 } | |
1731 st->cr(); | |
1732 } | |
1733 | |
1734 | |
1735 static void print_signal_handler(outputStream* st, int sig, | |
1736 char* buf, size_t buflen); | |
1737 | |
1738 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1739 st->print_cr("Signal Handlers:"); | |
1740 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1741 print_signal_handler(st, SIGBUS , buf, buflen); | |
1742 print_signal_handler(st, SIGFPE , buf, buflen); | |
1743 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1744 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1745 print_signal_handler(st, SIGILL , buf, buflen); | |
1746 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1747 print_signal_handler(st, SR_signum, buf, buflen); | |
1748 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1749 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1750 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1751 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1752 } | |
1753 | |
1754 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1755 | |
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1756 // Find the full path to the current module, libjvm |
3960 | 1757 void os::jvm_path(char *buf, jint buflen) { |
1758 // Error checking. | |
1759 if (buflen < MAXPATHLEN) { | |
1760 assert(false, "must use a large-enough buffer"); | |
1761 buf[0] = '\0'; | |
1762 return; | |
1763 } | |
1764 // Lazy resolve the path to current module. | |
1765 if (saved_jvm_path[0] != 0) { | |
1766 strcpy(buf, saved_jvm_path); | |
1767 return; | |
1768 } | |
1769 | |
1770 char dli_fname[MAXPATHLEN]; | |
1771 bool ret = dll_address_to_library_name( | |
1772 CAST_FROM_FN_PTR(address, os::jvm_path), | |
1773 dli_fname, sizeof(dli_fname), NULL); | |
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|
1774 assert(ret, "cannot locate libjvm"); |
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|
1775 char *rp = NULL; |
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1776 if (ret && dli_fname[0] != '\0') { |
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1777 rp = realpath(dli_fname, buf); |
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1778 } |
3960 | 1779 if (rp == NULL) |
1780 return; | |
1781 | |
1782 if (Arguments::created_by_gamma_launcher()) { | |
1783 // Support for the gamma launcher. Typical value for buf is | |
4846 | 1784 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
3960 | 1785 // the right place in the string, then assume we are installed in a JDK and |
4846 | 1786 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
1787 // construct a path to the JVM being overridden. | |
1788 | |
3960 | 1789 const char *p = buf + strlen(buf) - 1; |
1790 for (int count = 0; p > buf && count < 5; ++count) { | |
1791 for (--p; p > buf && *p != '/'; --p) | |
1792 /* empty */ ; | |
1793 } | |
1794 | |
1795 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
1796 // Look for JAVA_HOME in the environment. | |
1797 char* java_home_var = ::getenv("JAVA_HOME"); | |
1798 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1799 char* jrelib_p; | |
1800 int len; | |
1801 | |
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1802 // Check the current module name "libjvm" |
3960 | 1803 p = strrchr(buf, '/'); |
1804 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
1805 | |
1806 rp = realpath(java_home_var, buf); | |
1807 if (rp == NULL) | |
1808 return; | |
1809 | |
1810 // determine if this is a legacy image or modules image | |
1811 // modules image doesn't have "jre" subdirectory | |
1812 len = strlen(buf); | |
1813 jrelib_p = buf + len; | |
4846 | 1814 |
1815 // Add the appropriate library subdir | |
1816 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
3960 | 1817 if (0 != access(buf, F_OK)) { |
4846 | 1818 snprintf(jrelib_p, buflen-len, "/lib"); |
3960 | 1819 } |
1820 | |
4846 | 1821 // Add the appropriate client or server subdir |
1822 len = strlen(buf); | |
1823 jrelib_p = buf + len; | |
1824 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
1825 if (0 != access(buf, F_OK)) { | |
1826 snprintf(jrelib_p, buflen-len, ""); | |
1827 } | |
1828 | |
1829 // If the path exists within JAVA_HOME, add the JVM library name | |
1830 // to complete the path to JVM being overridden. Otherwise fallback | |
1831 // to the path to the current library. | |
3960 | 1832 if (0 == access(buf, F_OK)) { |
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1833 // Use current module name "libjvm" |
3960 | 1834 len = strlen(buf); |
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1835 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
3960 | 1836 } else { |
4846 | 1837 // Fall back to path of current library |
3960 | 1838 rp = realpath(dli_fname, buf); |
1839 if (rp == NULL) | |
1840 return; | |
1841 } | |
1842 } | |
1843 } | |
1844 } | |
1845 | |
1846 strcpy(saved_jvm_path, buf); | |
1847 } | |
1848 | |
1849 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1850 // no prefix required, not even "_" | |
1851 } | |
1852 | |
1853 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1854 // no suffix required | |
1855 } | |
1856 | |
1857 //////////////////////////////////////////////////////////////////////////////// | |
1858 // sun.misc.Signal support | |
1859 | |
1860 static volatile jint sigint_count = 0; | |
1861 | |
1862 static void | |
1863 UserHandler(int sig, void *siginfo, void *context) { | |
1864 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1865 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1866 // don't want to flood the manager thread with sem_post requests. | |
1867 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1868 return; | |
1869 | |
1870 // Ctrl-C is pressed during error reporting, likely because the error | |
1871 // handler fails to abort. Let VM die immediately. | |
1872 if (sig == SIGINT && is_error_reported()) { | |
1873 os::die(); | |
1874 } | |
1875 | |
1876 os::signal_notify(sig); | |
1877 } | |
1878 | |
1879 void* os::user_handler() { | |
1880 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1881 } | |
1882 | |
1883 extern "C" { | |
1884 typedef void (*sa_handler_t)(int); | |
1885 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1886 } | |
1887 | |
1888 void* os::signal(int signal_number, void* handler) { | |
1889 struct sigaction sigAct, oldSigAct; | |
1890 | |
1891 sigfillset(&(sigAct.sa_mask)); | |
1892 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1893 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1894 | |
1895 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1896 // -1 means registration failed | |
1897 return (void *)-1; | |
1898 } | |
1899 | |
1900 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1901 } | |
1902 | |
1903 void os::signal_raise(int signal_number) { | |
1904 ::raise(signal_number); | |
1905 } | |
1906 | |
1907 /* | |
1908 * The following code is moved from os.cpp for making this | |
1909 * code platform specific, which it is by its very nature. | |
1910 */ | |
1911 | |
1912 // Will be modified when max signal is changed to be dynamic | |
1913 int os::sigexitnum_pd() { | |
1914 return NSIG; | |
1915 } | |
1916 | |
1917 // a counter for each possible signal value | |
1918 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1919 | |
1920 // Bsd(POSIX) specific hand shaking semaphore. | |
1921 #ifdef __APPLE__ | |
10405 | 1922 typedef semaphore_t os_semaphore_t; |
3960 | 1923 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
10405 | 1924 #define SEM_WAIT(sem) semaphore_wait(sem) |
1925 #define SEM_POST(sem) semaphore_signal(sem) | |
1926 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) | |
3960 | 1927 #else |
10405 | 1928 typedef sem_t os_semaphore_t; |
3960 | 1929 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
10405 | 1930 #define SEM_WAIT(sem) sem_wait(&sem) |
1931 #define SEM_POST(sem) sem_post(&sem) | |
1932 #define SEM_DESTROY(sem) sem_destroy(&sem) | |
3960 | 1933 #endif |
1934 | |
10405 | 1935 class Semaphore : public StackObj { |
1936 public: | |
1937 Semaphore(); | |
1938 ~Semaphore(); | |
1939 void signal(); | |
1940 void wait(); | |
1941 bool trywait(); | |
1942 bool timedwait(unsigned int sec, int nsec); | |
1943 private: | |
1944 jlong currenttime() const; | |
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1945 os_semaphore_t _semaphore; |
10405 | 1946 }; |
1947 | |
1948 Semaphore::Semaphore() : _semaphore(0) { | |
1949 SEM_INIT(_semaphore, 0); | |
1950 } | |
1951 | |
1952 Semaphore::~Semaphore() { | |
1953 SEM_DESTROY(_semaphore); | |
1954 } | |
1955 | |
1956 void Semaphore::signal() { | |
1957 SEM_POST(_semaphore); | |
1958 } | |
1959 | |
1960 void Semaphore::wait() { | |
1961 SEM_WAIT(_semaphore); | |
1962 } | |
1963 | |
1964 jlong Semaphore::currenttime() const { | |
1965 struct timeval tv; | |
1966 gettimeofday(&tv, NULL); | |
1967 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); | |
1968 } | |
1969 | |
1970 #ifdef __APPLE__ | |
1971 bool Semaphore::trywait() { | |
1972 return timedwait(0, 0); | |
1973 } | |
1974 | |
1975 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
1976 kern_return_t kr = KERN_ABORTED; | |
1977 mach_timespec_t waitspec; | |
1978 waitspec.tv_sec = sec; | |
1979 waitspec.tv_nsec = nsec; | |
1980 | |
1981 jlong starttime = currenttime(); | |
1982 | |
1983 kr = semaphore_timedwait(_semaphore, waitspec); | |
1984 while (kr == KERN_ABORTED) { | |
1985 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; | |
1986 | |
1987 jlong current = currenttime(); | |
1988 jlong passedtime = current - starttime; | |
1989 | |
1990 if (passedtime >= totalwait) { | |
1991 waitspec.tv_sec = 0; | |
1992 waitspec.tv_nsec = 0; | |
1993 } else { | |
1994 jlong waittime = totalwait - (current - starttime); | |
1995 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; | |
1996 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; | |
1997 } | |
1998 | |
1999 kr = semaphore_timedwait(_semaphore, waitspec); | |
2000 } | |
2001 | |
2002 return kr == KERN_SUCCESS; | |
2003 } | |
2004 | |
2005 #else | |
2006 | |
2007 bool Semaphore::trywait() { | |
2008 return sem_trywait(&_semaphore) == 0; | |
2009 } | |
2010 | |
2011 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
2012 struct timespec ts; | |
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2013 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); |
10405 | 2014 |
2015 while (1) { | |
2016 int result = sem_timedwait(&_semaphore, &ts); | |
2017 if (result == 0) { | |
2018 return true; | |
2019 } else if (errno == EINTR) { | |
2020 continue; | |
2021 } else if (errno == ETIMEDOUT) { | |
2022 return false; | |
2023 } else { | |
2024 return false; | |
2025 } | |
2026 } | |
2027 } | |
2028 | |
2029 #endif // __APPLE__ | |
2030 | |
2031 static os_semaphore_t sig_sem; | |
2032 static Semaphore sr_semaphore; | |
2033 | |
3960 | 2034 void os::signal_init_pd() { |
2035 // Initialize signal structures | |
2036 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2037 | |
2038 // Initialize signal semaphore | |
2039 ::SEM_INIT(sig_sem, 0); | |
2040 } | |
2041 | |
2042 void os::signal_notify(int sig) { | |
2043 Atomic::inc(&pending_signals[sig]); | |
2044 ::SEM_POST(sig_sem); | |
2045 } | |
2046 | |
2047 static int check_pending_signals(bool wait) { | |
2048 Atomic::store(0, &sigint_count); | |
2049 for (;;) { | |
2050 for (int i = 0; i < NSIG + 1; i++) { | |
2051 jint n = pending_signals[i]; | |
2052 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2053 return i; | |
2054 } | |
2055 } | |
2056 if (!wait) { | |
2057 return -1; | |
2058 } | |
2059 JavaThread *thread = JavaThread::current(); | |
2060 ThreadBlockInVM tbivm(thread); | |
2061 | |
2062 bool threadIsSuspended; | |
2063 do { | |
2064 thread->set_suspend_equivalent(); | |
2065 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2066 ::SEM_WAIT(sig_sem); | |
2067 | |
2068 // were we externally suspended while we were waiting? | |
2069 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2070 if (threadIsSuspended) { | |
2071 // | |
2072 // The semaphore has been incremented, but while we were waiting | |
2073 // another thread suspended us. We don't want to continue running | |
2074 // while suspended because that would surprise the thread that | |
2075 // suspended us. | |
2076 // | |
2077 ::SEM_POST(sig_sem); | |
2078 | |
2079 thread->java_suspend_self(); | |
2080 } | |
2081 } while (threadIsSuspended); | |
2082 } | |
2083 } | |
2084 | |
2085 int os::signal_lookup() { | |
2086 return check_pending_signals(false); | |
2087 } | |
2088 | |
2089 int os::signal_wait() { | |
2090 return check_pending_signals(true); | |
2091 } | |
2092 | |
2093 //////////////////////////////////////////////////////////////////////////////// | |
2094 // Virtual Memory | |
2095 | |
2096 int os::vm_page_size() { | |
2097 // Seems redundant as all get out | |
2098 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2099 return os::Bsd::page_size(); | |
2100 } | |
2101 | |
2102 // Solaris allocates memory by pages. | |
2103 int os::vm_allocation_granularity() { | |
2104 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2105 return os::Bsd::page_size(); | |
2106 } | |
2107 | |
2108 // Rationale behind this function: | |
2109 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2110 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2111 // samples for JITted code. Here we create private executable mapping over the code cache | |
2112 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2113 // info for the reporting script by storing timestamp and location of symbol | |
2114 void bsd_wrap_code(char* base, size_t size) { | |
2115 static volatile jint cnt = 0; | |
2116 | |
2117 if (!UseOprofile) { | |
2118 return; | |
2119 } | |
2120 | |
2121 char buf[PATH_MAX + 1]; | |
2122 int num = Atomic::add(1, &cnt); | |
2123 | |
2124 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
2125 os::get_temp_directory(), os::current_process_id(), num); | |
2126 unlink(buf); | |
2127 | |
2128 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
2129 | |
2130 if (fd != -1) { | |
2131 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
2132 if (rv != (off_t)-1) { | |
2133 if (::write(fd, "", 1) == 1) { | |
2134 mmap(base, size, | |
2135 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2136 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2137 } | |
2138 } | |
2139 ::close(fd); | |
2140 unlink(buf); | |
2141 } | |
2142 } | |
2143 | |
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2144 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
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2145 int err) { |
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2146 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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2147 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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2148 strerror(err), err); |
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2149 } |
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2150 |
3960 | 2151 // NOTE: Bsd kernel does not really reserve the pages for us. |
2152 // All it does is to check if there are enough free pages | |
2153 // left at the time of mmap(). This could be a potential | |
2154 // problem. | |
6197 | 2155 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
3960 | 2156 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2157 #ifdef __OpenBSD__ | |
2158 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
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2159 if (::mprotect(addr, size, prot) == 0) { |
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2160 return true; |
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2161 } |
3960 | 2162 #else |
2163 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
2164 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
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2165 if (res != (uintptr_t) MAP_FAILED) { |
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2166 return true; |
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2167 } |
3960 | 2168 #endif |
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2169 |
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2170 // Warn about any commit errors we see in non-product builds just |
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2171 // in case mmap() doesn't work as described on the man page. |
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2172 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) |
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2173 |
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2174 return false; |
3960 | 2175 } |
2176 | |
6197 | 2177 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
3960 | 2178 bool exec) { |
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2179 // alignment_hint is ignored on this OS |
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2180 return pd_commit_memory(addr, size, exec); |
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2181 } |
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2182 |
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2183 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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2184 const char* mesg) { |
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2185 assert(mesg != NULL, "mesg must be specified"); |
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2186 if (!pd_commit_memory(addr, size, exec)) { |
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2187 // add extra info in product mode for vm_exit_out_of_memory(): |
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2188 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) |
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2189 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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2190 } |
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2191 } |
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2192 |
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2193 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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2194 size_t alignment_hint, bool exec, |
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2195 const char* mesg) { |
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2196 // alignment_hint is ignored on this OS |
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2197 pd_commit_memory_or_exit(addr, size, exec, mesg); |
3960 | 2198 } |
2199 | |
6197 | 2200 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2201 } |
2202 | |
6197 | 2203 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2204 ::madvise(addr, bytes, MADV_DONTNEED); |
2205 } | |
2206 | |
2207 void os::numa_make_global(char *addr, size_t bytes) { | |
2208 } | |
2209 | |
2210 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2211 } | |
2212 | |
2213 bool os::numa_topology_changed() { return false; } | |
2214 | |
2215 size_t os::numa_get_groups_num() { | |
2216 return 1; | |
2217 } | |
2218 | |
2219 int os::numa_get_group_id() { | |
2220 return 0; | |
2221 } | |
2222 | |
2223 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2224 if (size > 0) { | |
2225 ids[0] = 0; | |
2226 return 1; | |
2227 } | |
2228 return 0; | |
2229 } | |
2230 | |
2231 bool os::get_page_info(char *start, page_info* info) { | |
2232 return false; | |
2233 } | |
2234 | |
2235 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2236 return end; | |
2237 } | |
2238 | |
2239 | |
6197 | 2240 bool os::pd_uncommit_memory(char* addr, size_t size) { |
3960 | 2241 #ifdef __OpenBSD__ |
2242 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
2243 return ::mprotect(addr, size, PROT_NONE) == 0; | |
2244 #else | |
2245 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
2246 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
2247 return res != (uintptr_t) MAP_FAILED; | |
2248 #endif | |
2249 } | |
2250 | |
6197 | 2251 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
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2252 return os::commit_memory(addr, size, !ExecMem); |
3960 | 2253 } |
2254 | |
2255 // If this is a growable mapping, remove the guard pages entirely by | |
2256 // munmap()ping them. If not, just call uncommit_memory(). | |
2257 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2258 return os::uncommit_memory(addr, size); | |
2259 } | |
2260 | |
2261 static address _highest_vm_reserved_address = NULL; | |
2262 | |
2263 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2264 // at 'requested_addr'. If there are existing memory mappings at the same | |
2265 // location, however, they will be overwritten. If 'fixed' is false, | |
2266 // 'requested_addr' is only treated as a hint, the return value may or | |
2267 // may not start from the requested address. Unlike Bsd mmap(), this | |
2268 // function returns NULL to indicate failure. | |
2269 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2270 char * addr; | |
2271 int flags; | |
2272 | |
2273 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2274 if (fixed) { | |
2275 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
2276 flags |= MAP_FIXED; | |
2277 } | |
2278 | |
10157 | 2279 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
2280 // touch an uncommitted page. Otherwise, the read/write might | |
2281 // succeed if we have enough swap space to back the physical page. | |
2282 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
3960 | 2283 flags, -1, 0); |
2284 | |
2285 if (addr != MAP_FAILED) { | |
2286 // anon_mmap() should only get called during VM initialization, | |
2287 // don't need lock (actually we can skip locking even it can be called | |
2288 // from multiple threads, because _highest_vm_reserved_address is just a | |
2289 // hint about the upper limit of non-stack memory regions.) | |
2290 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2291 _highest_vm_reserved_address = (address)addr + bytes; | |
2292 } | |
2293 } | |
2294 | |
2295 return addr == MAP_FAILED ? NULL : addr; | |
2296 } | |
2297 | |
2298 // Don't update _highest_vm_reserved_address, because there might be memory | |
2299 // regions above addr + size. If so, releasing a memory region only creates | |
2300 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2301 // | |
2302 static int anon_munmap(char * addr, size_t size) { | |
2303 return ::munmap(addr, size) == 0; | |
2304 } | |
2305 | |
6197 | 2306 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
3960 | 2307 size_t alignment_hint) { |
2308 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2309 } | |
2310 | |
6197 | 2311 bool os::pd_release_memory(char* addr, size_t size) { |
3960 | 2312 return anon_munmap(addr, size); |
2313 } | |
2314 | |
2315 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
2316 // Bsd wants the mprotect address argument to be page aligned. | |
2317 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
2318 | |
2319 // According to SUSv3, mprotect() should only be used with mappings | |
2320 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2321 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2322 // protection of malloc'ed or statically allocated memory). Check the | |
2323 // caller if you hit this assert. | |
2324 assert(addr == bottom, "sanity check"); | |
2325 | |
2326 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
2327 return ::mprotect(bottom, size, prot) == 0; | |
2328 } | |
2329 | |
2330 // Set protections specified | |
2331 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
2332 bool is_committed) { | |
2333 unsigned int p = 0; | |
2334 switch (prot) { | |
2335 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2336 case MEM_PROT_READ: p = PROT_READ; break; | |
2337 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2338 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2339 default: | |
2340 ShouldNotReachHere(); | |
2341 } | |
2342 // is_committed is unused. | |
2343 return bsd_mprotect(addr, bytes, p); | |
2344 } | |
2345 | |
2346 bool os::guard_memory(char* addr, size_t size) { | |
2347 return bsd_mprotect(addr, size, PROT_NONE); | |
2348 } | |
2349 | |
2350 bool os::unguard_memory(char* addr, size_t size) { | |
2351 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
2352 } | |
2353 | |
2354 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
6918 | 2355 return false; |
3960 | 2356 } |
2357 | |
2358 // Large page support | |
2359 | |
2360 static size_t _large_page_size = 0; | |
2361 | |
2362 void os::large_page_init() { | |
2363 } | |
2364 | |
2365 | |
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2366 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
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2367 fatal("This code is not used or maintained."); |
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2368 |
3960 | 2369 // "exec" is passed in but not used. Creating the shared image for |
2370 // the code cache doesn't have an SHM_X executable permission to check. | |
2371 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
2372 | |
2373 key_t key = IPC_PRIVATE; | |
2374 char *addr; | |
2375 | |
2376 bool warn_on_failure = UseLargePages && | |
2377 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2378 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2379 ); | |
2380 char msg[128]; | |
2381 | |
2382 // Create a large shared memory region to attach to based on size. | |
2383 // Currently, size is the total size of the heap | |
2384 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
2385 if (shmid == -1) { | |
2386 // Possible reasons for shmget failure: | |
2387 // 1. shmmax is too small for Java heap. | |
2388 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2389 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2390 // 2. not enough large page memory. | |
2391 // > check available large pages: cat /proc/meminfo | |
2392 // > increase amount of large pages: | |
2393 // echo new_value > /proc/sys/vm/nr_hugepages | |
2394 // Note 1: different Bsd may use different name for this property, | |
2395 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2396 // Note 2: it's possible there's enough physical memory available but | |
2397 // they are so fragmented after a long run that they can't | |
2398 // coalesce into large pages. Try to reserve large pages when | |
2399 // the system is still "fresh". | |
2400 if (warn_on_failure) { | |
2401 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2402 warning(msg); | |
2403 } | |
2404 return NULL; | |
2405 } | |
2406 | |
2407 // attach to the region | |
2408 addr = (char*)shmat(shmid, req_addr, 0); | |
2409 int err = errno; | |
2410 | |
2411 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2412 // will be deleted when it's detached by shmdt() or when the process | |
2413 // terminates. If shmat() is not successful this will remove the shared | |
2414 // segment immediately. | |
2415 shmctl(shmid, IPC_RMID, NULL); | |
2416 | |
2417 if ((intptr_t)addr == -1) { | |
2418 if (warn_on_failure) { | |
2419 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2420 warning(msg); | |
2421 } | |
2422 return NULL; | |
2423 } | |
2424 | |
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2425 // The memory is committed |
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2426 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
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2427 |
3960 | 2428 return addr; |
2429 } | |
2430 | |
2431 bool os::release_memory_special(char* base, size_t bytes) { | |
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2432 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
3960 | 2433 // detaching the SHM segment will also delete it, see reserve_memory_special() |
2434 int rslt = shmdt(base); | |
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2435 if (rslt == 0) { |
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2436 tkr.record((address)base, bytes); |
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2437 return true; |
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2438 } else { |
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2439 tkr.discard(); |
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2440 return false; |
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2441 } |
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2442 |
3960 | 2443 } |
2444 | |
2445 size_t os::large_page_size() { | |
2446 return _large_page_size; | |
2447 } | |
2448 | |
2449 // HugeTLBFS allows application to commit large page memory on demand; | |
2450 // with SysV SHM the entire memory region must be allocated as shared | |
2451 // memory. | |
2452 bool os::can_commit_large_page_memory() { | |
2453 return UseHugeTLBFS; | |
2454 } | |
2455 | |
2456 bool os::can_execute_large_page_memory() { | |
2457 return UseHugeTLBFS; | |
2458 } | |
2459 | |
2460 // Reserve memory at an arbitrary address, only if that area is | |
2461 // available (and not reserved for something else). | |
2462 | |
6197 | 2463 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
3960 | 2464 const int max_tries = 10; |
2465 char* base[max_tries]; | |
2466 size_t size[max_tries]; | |
2467 const size_t gap = 0x000000; | |
2468 | |
2469 // Assert only that the size is a multiple of the page size, since | |
2470 // that's all that mmap requires, and since that's all we really know | |
2471 // about at this low abstraction level. If we need higher alignment, | |
2472 // we can either pass an alignment to this method or verify alignment | |
2473 // in one of the methods further up the call chain. See bug 5044738. | |
2474 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
2475 | |
2476 // Repeatedly allocate blocks until the block is allocated at the | |
2477 // right spot. Give up after max_tries. Note that reserve_memory() will | |
2478 // automatically update _highest_vm_reserved_address if the call is | |
2479 // successful. The variable tracks the highest memory address every reserved | |
2480 // by JVM. It is used to detect heap-stack collision if running with | |
2481 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
2482 // space than needed, it could confuse the collision detecting code. To | |
2483 // solve the problem, save current _highest_vm_reserved_address and | |
2484 // calculate the correct value before return. | |
2485 address old_highest = _highest_vm_reserved_address; | |
2486 | |
2487 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
2488 // if kernel honors the hint then we can return immediately. | |
2489 char * addr = anon_mmap(requested_addr, bytes, false); | |
2490 if (addr == requested_addr) { | |
2491 return requested_addr; | |
2492 } | |
2493 | |
2494 if (addr != NULL) { | |
2495 // mmap() is successful but it fails to reserve at the requested address | |
2496 anon_munmap(addr, bytes); | |
2497 } | |
2498 | |
2499 int i; | |
2500 for (i = 0; i < max_tries; ++i) { | |
2501 base[i] = reserve_memory(bytes); | |
2502 | |
2503 if (base[i] != NULL) { | |
2504 // Is this the block we wanted? | |
2505 if (base[i] == requested_addr) { | |
2506 size[i] = bytes; | |
2507 break; | |
2508 } | |
2509 | |
2510 // Does this overlap the block we wanted? Give back the overlapped | |
2511 // parts and try again. | |
2512 | |
2513 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
2514 if (top_overlap >= 0 && top_overlap < bytes) { | |
2515 unmap_memory(base[i], top_overlap); | |
2516 base[i] += top_overlap; | |
2517 size[i] = bytes - top_overlap; | |
2518 } else { | |
2519 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
2520 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
2521 unmap_memory(requested_addr, bottom_overlap); | |
2522 size[i] = bytes - bottom_overlap; | |
2523 } else { | |
2524 size[i] = bytes; | |
2525 } | |
2526 } | |
2527 } | |
2528 } | |
2529 | |
2530 // Give back the unused reserved pieces. | |
2531 | |
2532 for (int j = 0; j < i; ++j) { | |
2533 if (base[j] != NULL) { | |
2534 unmap_memory(base[j], size[j]); | |
2535 } | |
2536 } | |
2537 | |
2538 if (i < max_tries) { | |
2539 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
2540 return requested_addr; | |
2541 } else { | |
2542 _highest_vm_reserved_address = old_highest; | |
2543 return NULL; | |
2544 } | |
2545 } | |
2546 | |
2547 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2548 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
2549 } | |
2550 | |
2551 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
2552 // Solaris uses poll(), bsd uses park(). | |
2553 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
2554 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
2555 // SIGSEGV, see 4355769. | |
2556 | |
2557 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2558 assert(thread == Thread::current(), "thread consistency check"); | |
2559 | |
2560 ParkEvent * const slp = thread->_SleepEvent ; | |
2561 slp->reset() ; | |
2562 OrderAccess::fence() ; | |
2563 | |
2564 if (interruptible) { | |
2565 jlong prevtime = javaTimeNanos(); | |
2566 | |
2567 for (;;) { | |
2568 if (os::is_interrupted(thread, true)) { | |
2569 return OS_INTRPT; | |
2570 } | |
2571 | |
2572 jlong newtime = javaTimeNanos(); | |
2573 | |
2574 if (newtime - prevtime < 0) { | |
2575 // time moving backwards, should only happen if no monotonic clock | |
2576 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2577 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2578 } else { | |
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2579 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2580 } |
2581 | |
2582 if(millis <= 0) { | |
2583 return OS_OK; | |
2584 } | |
2585 | |
2586 prevtime = newtime; | |
2587 | |
2588 { | |
2589 assert(thread->is_Java_thread(), "sanity check"); | |
2590 JavaThread *jt = (JavaThread *) thread; | |
2591 ThreadBlockInVM tbivm(jt); | |
2592 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2593 | |
2594 jt->set_suspend_equivalent(); | |
2595 // cleared by handle_special_suspend_equivalent_condition() or | |
2596 // java_suspend_self() via check_and_wait_while_suspended() | |
2597 | |
2598 slp->park(millis); | |
2599 | |
2600 // were we externally suspended while we were waiting? | |
2601 jt->check_and_wait_while_suspended(); | |
2602 } | |
2603 } | |
2604 } else { | |
2605 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2606 jlong prevtime = javaTimeNanos(); | |
2607 | |
2608 for (;;) { | |
2609 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2610 // the 1st iteration ... | |
2611 jlong newtime = javaTimeNanos(); | |
2612 | |
2613 if (newtime - prevtime < 0) { | |
2614 // time moving backwards, should only happen if no monotonic clock | |
2615 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2616 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2617 } else { | |
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2618 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2619 } |
2620 | |
2621 if(millis <= 0) break ; | |
2622 | |
2623 prevtime = newtime; | |
2624 slp->park(millis); | |
2625 } | |
2626 return OS_OK ; | |
2627 } | |
2628 } | |
2629 | |
2630 int os::naked_sleep() { | |
2631 // %% make the sleep time an integer flag. for now use 1 millisec. | |
2632 return os::sleep(Thread::current(), 1, false); | |
2633 } | |
2634 | |
2635 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2636 void os::infinite_sleep() { | |
2637 while (true) { // sleep forever ... | |
2638 ::sleep(100); // ... 100 seconds at a time | |
2639 } | |
2640 } | |
2641 | |
2642 // Used to convert frequent JVM_Yield() to nops | |
2643 bool os::dont_yield() { | |
2644 return DontYieldALot; | |
2645 } | |
2646 | |
2647 void os::yield() { | |
2648 sched_yield(); | |
2649 } | |
2650 | |
2651 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
2652 | |
2653 void os::yield_all(int attempts) { | |
2654 // Yields to all threads, including threads with lower priorities | |
2655 // Threads on Bsd are all with same priority. The Solaris style | |
2656 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2657 sched_yield(); | |
2658 } | |
2659 | |
2660 // Called from the tight loops to possibly influence time-sharing heuristics | |
2661 void os::loop_breaker(int attempts) { | |
2662 os::yield_all(attempts); | |
2663 } | |
2664 | |
2665 //////////////////////////////////////////////////////////////////////////////// | |
2666 // thread priority support | |
2667 | |
2668 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
2669 // only supports dynamic priority, static priority must be zero. For real-time | |
2670 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
2671 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
2672 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
2673 // of 5 runs - Sep 2005). | |
2674 // | |
2675 // The following code actually changes the niceness of kernel-thread/LWP. It | |
2676 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
2677 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
2678 // threads. It has always been the case, but could change in the future. For | |
2679 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
2680 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
2681 | |
6918 | 2682 #if !defined(__APPLE__) |
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2683 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2684 19, // 0 Entry should never be used |
2685 | |
2686 0, // 1 MinPriority | |
2687 3, // 2 | |
2688 6, // 3 | |
2689 | |
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2690 10, // 4 |
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2691 15, // 5 NormPriority |
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2692 18, // 6 |
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2693 |
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2694 21, // 7 |
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2695 25, // 8 |
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2696 28, // 9 NearMaxPriority |
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2697 |
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2698 31, // 10 MaxPriority |
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2699 |
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2700 31 // 11 CriticalPriority |
3960 | 2701 }; |
6918 | 2702 #else |
3960 | 2703 /* Using Mach high-level priority assignments */ |
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2704 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2705 0, // 0 Entry should never be used (MINPRI_USER) |
2706 | |
2707 27, // 1 MinPriority | |
2708 28, // 2 | |
2709 29, // 3 | |
2710 | |
2711 30, // 4 | |
2712 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
2713 32, // 6 | |
2714 | |
2715 33, // 7 | |
2716 34, // 8 | |
2717 35, // 9 NearMaxPriority | |
2718 | |
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2719 36, // 10 MaxPriority |
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2720 |
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2721 36 // 11 CriticalPriority |
3960 | 2722 }; |
2723 #endif | |
2724 | |
2725 static int prio_init() { | |
2726 if (ThreadPriorityPolicy == 1) { | |
2727 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
2728 // if effective uid is not root. Perhaps, a more elegant way of doing | |
2729 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
2730 if (geteuid() != 0) { | |
2731 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
2732 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
2733 } | |
2734 ThreadPriorityPolicy = 0; | |
2735 } | |
2736 } | |
4854
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|
2737 if (UseCriticalJavaThreadPriority) { |
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2738 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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|
2739 } |
3960 | 2740 return 0; |
2741 } | |
2742 | |
2743 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2744 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
2745 | |
2746 #ifdef __OpenBSD__ | |
2747 // OpenBSD pthread_setprio starves low priority threads | |
2748 return OS_OK; | |
2749 #elif defined(__FreeBSD__) | |
2750 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
2751 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2752 struct sched_param sp; | |
2753 int policy; | |
2754 pthread_t self = pthread_self(); | |
2755 | |
2756 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
2757 return OS_ERR; | |
2758 | |
2759 sp.sched_priority = newpri; | |
2760 if (pthread_setschedparam(self, policy, &sp) != 0) | |
2761 return OS_ERR; | |
2762 | |
2763 return OS_OK; | |
2764 #else | |
2765 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
2766 return (ret == 0) ? OS_OK : OS_ERR; | |
2767 #endif | |
2768 } | |
2769 | |
2770 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2771 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
2772 *priority_ptr = java_to_os_priority[NormPriority]; | |
2773 return OS_OK; | |
2774 } | |
2775 | |
2776 errno = 0; | |
2777 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
2778 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
2779 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2780 int policy; | |
2781 struct sched_param sp; | |
2782 | |
2783 pthread_getschedparam(pthread_self(), &policy, &sp); | |
2784 *priority_ptr = sp.sched_priority; | |
2785 #else | |
2786 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
2787 #endif | |
2788 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
2789 } | |
2790 | |
2791 // Hint to the underlying OS that a task switch would not be good. | |
2792 // Void return because it's a hint and can fail. | |
2793 void os::hint_no_preempt() {} | |
2794 | |
2795 //////////////////////////////////////////////////////////////////////////////// | |
2796 // suspend/resume support | |
2797 | |
2798 // the low-level signal-based suspend/resume support is a remnant from the | |
2799 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2800 // within hotspot. Now there is a single use-case for this: | |
2801 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2802 // that runs in the watcher thread. | |
2803 // The remaining code is greatly simplified from the more general suspension | |
2804 // code that used to be used. | |
2805 // | |
2806 // The protocol is quite simple: | |
2807 // - suspend: | |
2808 // - sends a signal to the target thread | |
2809 // - polls the suspend state of the osthread using a yield loop | |
2810 // - target thread signal handler (SR_handler) sets suspend state | |
2811 // and blocks in sigsuspend until continued | |
2812 // - resume: | |
2813 // - sets target osthread state to continue | |
2814 // - sends signal to end the sigsuspend loop in the SR_handler | |
2815 // | |
2816 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
2817 // | |
2818 | |
2819 static void resume_clear_context(OSThread *osthread) { | |
2820 osthread->set_ucontext(NULL); | |
2821 osthread->set_siginfo(NULL); | |
2822 } | |
2823 | |
2824 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
2825 osthread->set_ucontext(context); | |
2826 osthread->set_siginfo(siginfo); | |
2827 } | |
2828 | |
2829 // | |
2830 // Handler function invoked when a thread's execution is suspended or | |
2831 // resumed. We have to be careful that only async-safe functions are | |
2832 // called here (Note: most pthread functions are not async safe and | |
2833 // should be avoided.) | |
2834 // | |
2835 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
2836 // interface point of view, but sigwait() prevents the signal hander | |
2837 // from being run. libpthread would get very confused by not having | |
2838 // its signal handlers run and prevents sigwait()'s use with the | |
2839 // mutex granting granting signal. | |
2840 // | |
10405 | 2841 // Currently only ever called on the VMThread or JavaThread |
3960 | 2842 // |
2843 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
2844 // Save and restore errno to avoid confusing native code with EINTR | |
2845 // after sigsuspend. | |
2846 int old_errno = errno; | |
2847 | |
2848 Thread* thread = Thread::current(); | |
2849 OSThread* osthread = thread->osthread(); | |
10405 | 2850 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
2851 | |
2852 os::SuspendResume::State current = osthread->sr.state(); | |
2853 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
3960 | 2854 suspend_save_context(osthread, siginfo, context); |
2855 | |
10405 | 2856 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
2857 os::SuspendResume::State state = osthread->sr.suspended(); | |
2858 if (state == os::SuspendResume::SR_SUSPENDED) { | |
2859 sigset_t suspend_set; // signals for sigsuspend() | |
2860 | |
2861 // get current set of blocked signals and unblock resume signal | |
2862 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
2863 sigdelset(&suspend_set, SR_signum); | |
2864 | |
2865 sr_semaphore.signal(); | |
2866 // wait here until we are resumed | |
2867 while (1) { | |
2868 sigsuspend(&suspend_set); | |
2869 | |
2870 os::SuspendResume::State result = osthread->sr.running(); | |
2871 if (result == os::SuspendResume::SR_RUNNING) { | |
2872 sr_semaphore.signal(); | |
2873 break; | |
2874 } else if (result != os::SuspendResume::SR_SUSPENDED) { | |
2875 ShouldNotReachHere(); | |
2876 } | |
2877 } | |
2878 | |
2879 } else if (state == os::SuspendResume::SR_RUNNING) { | |
2880 // request was cancelled, continue | |
2881 } else { | |
2882 ShouldNotReachHere(); | |
2883 } | |
3960 | 2884 |
2885 resume_clear_context(osthread); | |
10405 | 2886 } else if (current == os::SuspendResume::SR_RUNNING) { |
2887 // request was cancelled, continue | |
2888 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
2889 // ignore | |
3960 | 2890 } else { |
10405 | 2891 // ignore |
3960 | 2892 } |
2893 | |
2894 errno = old_errno; | |
2895 } | |
2896 | |
2897 | |
2898 static int SR_initialize() { | |
2899 struct sigaction act; | |
2900 char *s; | |
2901 /* Get signal number to use for suspend/resume */ | |
2902 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
2903 int sig = ::strtol(s, 0, 10); | |
2904 if (sig > 0 || sig < NSIG) { | |
2905 SR_signum = sig; | |
2906 } | |
2907 } | |
2908 | |
2909 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
2910 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
2911 | |
2912 sigemptyset(&SR_sigset); | |
2913 sigaddset(&SR_sigset, SR_signum); | |
2914 | |
2915 /* Set up signal handler for suspend/resume */ | |
2916 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
2917 act.sa_handler = (void (*)(int)) SR_handler; | |
2918 | |
2919 // SR_signum is blocked by default. | |
2920 // 4528190 - We also need to block pthread restart signal (32 on all | |
2921 // supported Bsd platforms). Note that BsdThreads need to block | |
2922 // this signal for all threads to work properly. So we don't have | |
2923 // to use hard-coded signal number when setting up the mask. | |
2924 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
2925 | |
2926 if (sigaction(SR_signum, &act, 0) == -1) { | |
2927 return -1; | |
2928 } | |
2929 | |
2930 // Save signal flag | |
2931 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
2932 return 0; | |
2933 } | |
2934 | |
10405 | 2935 static int sr_notify(OSThread* osthread) { |
2936 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2937 assert_status(status == 0, status, "pthread_kill"); | |
2938 return status; | |
2939 } | |
2940 | |
2941 // "Randomly" selected value for how long we want to spin | |
2942 // before bailing out on suspending a thread, also how often | |
2943 // we send a signal to a thread we want to resume | |
2944 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
2945 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
3960 | 2946 |
2947 // returns true on success and false on error - really an error is fatal | |
2948 // but this seems the normal response to library errors | |
2949 static bool do_suspend(OSThread* osthread) { | |
10405 | 2950 assert(osthread->sr.is_running(), "thread should be running"); |
2951 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
2952 | |
3960 | 2953 // mark as suspended and send signal |
10405 | 2954 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
2955 // failed to switch, state wasn't running? | |
2956 ShouldNotReachHere(); | |
3960 | 2957 return false; |
2958 } | |
10405 | 2959 |
2960 if (sr_notify(osthread) != 0) { | |
2961 ShouldNotReachHere(); | |
2962 } | |
2963 | |
2964 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
2965 while (true) { | |
2966 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
2967 break; | |
2968 } else { | |
2969 // timeout | |
2970 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
2971 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
2972 return false; | |
2973 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
2974 // make sure that we consume the signal on the semaphore as well | |
2975 sr_semaphore.wait(); | |
2976 break; | |
2977 } else { | |
2978 ShouldNotReachHere(); | |
2979 return false; | |
2980 } | |
2981 } | |
2982 } | |
2983 | |
2984 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
2985 return true; | |
3960 | 2986 } |
2987 | |
2988 static void do_resume(OSThread* osthread) { | |
2989 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 2990 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
2991 | |
2992 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
2993 // failed to switch to WAKEUP_REQUEST | |
2994 ShouldNotReachHere(); | |
2995 return; | |
2996 } | |
2997 | |
2998 while (true) { | |
2999 if (sr_notify(osthread) == 0) { | |
3000 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
3001 if (osthread->sr.is_running()) { | |
3002 return; | |
3003 } | |
3004 } | |
3005 } else { | |
3006 ShouldNotReachHere(); | |
3960 | 3007 } |
3008 } | |
10405 | 3009 |
3010 guarantee(osthread->sr.is_running(), "Must be running!"); | |
3960 | 3011 } |
3012 | |
3013 //////////////////////////////////////////////////////////////////////////////// | |
3014 // interrupt support | |
3015 | |
3016 void os::interrupt(Thread* thread) { | |
3017 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3018 "possibility of dangling Thread pointer"); | |
3019 | |
3020 OSThread* osthread = thread->osthread(); | |
3021 | |
3022 if (!osthread->interrupted()) { | |
3023 osthread->set_interrupted(true); | |
3024 // More than one thread can get here with the same value of osthread, | |
3025 // resulting in multiple notifications. We do, however, want the store | |
3026 // to interrupted() to be visible to other threads before we execute unpark(). | |
3027 OrderAccess::fence(); | |
3028 ParkEvent * const slp = thread->_SleepEvent ; | |
3029 if (slp != NULL) slp->unpark() ; | |
3030 } | |
3031 | |
3032 // For JSR166. Unpark even if interrupt status already was set | |
3033 if (thread->is_Java_thread()) | |
3034 ((JavaThread*)thread)->parker()->unpark(); | |
3035 | |
3036 ParkEvent * ev = thread->_ParkEvent ; | |
3037 if (ev != NULL) ev->unpark() ; | |
3038 | |
3039 } | |
3040 | |
3041 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3042 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3043 "possibility of dangling Thread pointer"); | |
3044 | |
3045 OSThread* osthread = thread->osthread(); | |
3046 | |
3047 bool interrupted = osthread->interrupted(); | |
3048 | |
3049 if (interrupted && clear_interrupted) { | |
3050 osthread->set_interrupted(false); | |
3051 // consider thread->_SleepEvent->reset() ... optional optimization | |
3052 } | |
3053 | |
3054 return interrupted; | |
3055 } | |
3056 | |
3057 /////////////////////////////////////////////////////////////////////////////////// | |
3058 // signal handling (except suspend/resume) | |
3059 | |
3060 // This routine may be used by user applications as a "hook" to catch signals. | |
3061 // The user-defined signal handler must pass unrecognized signals to this | |
3062 // routine, and if it returns true (non-zero), then the signal handler must | |
3063 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3064 // routine will never retun false (zero), but instead will execute a VM panic | |
3065 // routine kill the process. | |
3066 // | |
3067 // If this routine returns false, it is OK to call it again. This allows | |
3068 // the user-defined signal handler to perform checks either before or after | |
3069 // the VM performs its own checks. Naturally, the user code would be making | |
3070 // a serious error if it tried to handle an exception (such as a null check | |
3071 // or breakpoint) that the VM was generating for its own correct operation. | |
3072 // | |
3073 // This routine may recognize any of the following kinds of signals: | |
3074 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3075 // It should be consulted by handlers for any of those signals. | |
3076 // | |
3077 // The caller of this routine must pass in the three arguments supplied | |
3078 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3079 // field of the structure passed to sigaction(). This routine assumes that | |
3080 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3081 // | |
3082 // Note that the VM will print warnings if it detects conflicting signal | |
3083 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3084 // | |
3085 extern "C" JNIEXPORT int | |
3086 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
3087 void* ucontext, int abort_if_unrecognized); | |
3088 | |
3089 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3090 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 3091 int orig_errno = errno; // Preserve errno value over signal handler. |
3960 | 3092 JVM_handle_bsd_signal(sig, info, uc, true); |
8067 | 3093 errno = orig_errno; |
3960 | 3094 } |
3095 | |
3096 | |
3097 // This boolean allows users to forward their own non-matching signals | |
3098 // to JVM_handle_bsd_signal, harmlessly. | |
3099 bool os::Bsd::signal_handlers_are_installed = false; | |
3100 | |
3101 // For signal-chaining | |
3102 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
3103 unsigned int os::Bsd::sigs = 0; | |
3104 bool os::Bsd::libjsig_is_loaded = false; | |
3105 typedef struct sigaction *(*get_signal_t)(int); | |
3106 get_signal_t os::Bsd::get_signal_action = NULL; | |
3107 | |
3108 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
3109 struct sigaction *actp = NULL; | |
3110 | |
3111 if (libjsig_is_loaded) { | |
3112 // Retrieve the old signal handler from libjsig | |
3113 actp = (*get_signal_action)(sig); | |
3114 } | |
3115 if (actp == NULL) { | |
3116 // Retrieve the preinstalled signal handler from jvm | |
3117 actp = get_preinstalled_handler(sig); | |
3118 } | |
3119 | |
3120 return actp; | |
3121 } | |
3122 | |
3123 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3124 siginfo_t *siginfo, void *context) { | |
3125 // Call the old signal handler | |
3126 if (actp->sa_handler == SIG_DFL) { | |
3127 // It's more reasonable to let jvm treat it as an unexpected exception | |
3128 // instead of taking the default action. | |
3129 return false; | |
3130 } else if (actp->sa_handler != SIG_IGN) { | |
3131 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
3132 // automaticlly block the signal | |
3133 sigaddset(&(actp->sa_mask), sig); | |
3134 } | |
3135 | |
3136 sa_handler_t hand; | |
3137 sa_sigaction_t sa; | |
3138 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
3139 // retrieve the chained handler | |
3140 if (siginfo_flag_set) { | |
3141 sa = actp->sa_sigaction; | |
3142 } else { | |
3143 hand = actp->sa_handler; | |
3144 } | |
3145 | |
3146 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
3147 actp->sa_handler = SIG_DFL; | |
3148 } | |
3149 | |
3150 // try to honor the signal mask | |
3151 sigset_t oset; | |
3152 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
3153 | |
3154 // call into the chained handler | |
3155 if (siginfo_flag_set) { | |
3156 (*sa)(sig, siginfo, context); | |
3157 } else { | |
3158 (*hand)(sig); | |
3159 } | |
3160 | |
3161 // restore the signal mask | |
3162 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
3163 } | |
3164 // Tell jvm's signal handler the signal is taken care of. | |
3165 return true; | |
3166 } | |
3167 | |
3168 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
3169 bool chained = false; | |
3170 // signal-chaining | |
3171 if (UseSignalChaining) { | |
3172 struct sigaction *actp = get_chained_signal_action(sig); | |
3173 if (actp != NULL) { | |
3174 chained = call_chained_handler(actp, sig, siginfo, context); | |
3175 } | |
3176 } | |
3177 return chained; | |
3178 } | |
3179 | |
3180 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
3181 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
3182 return &sigact[sig]; | |
3183 } | |
3184 return NULL; | |
3185 } | |
3186 | |
3187 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
3188 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3189 sigact[sig] = oldAct; | |
3190 sigs |= (unsigned int)1 << sig; | |
3191 } | |
3192 | |
3193 // for diagnostic | |
3194 int os::Bsd::sigflags[MAXSIGNUM]; | |
3195 | |
3196 int os::Bsd::get_our_sigflags(int sig) { | |
3197 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3198 return sigflags[sig]; | |
3199 } | |
3200 | |
3201 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
3202 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3203 sigflags[sig] = flags; | |
3204 } | |
3205 | |
3206 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
3207 // Check for overwrite. | |
3208 struct sigaction oldAct; | |
3209 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3210 | |
3211 void* oldhand = oldAct.sa_sigaction | |
3212 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3213 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3214 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3215 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3216 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3217 if (AllowUserSignalHandlers || !set_installed) { | |
3218 // Do not overwrite; user takes responsibility to forward to us. | |
3219 return; | |
3220 } else if (UseSignalChaining) { | |
3221 // save the old handler in jvm | |
3222 save_preinstalled_handler(sig, oldAct); | |
3223 // libjsig also interposes the sigaction() call below and saves the | |
3224 // old sigaction on it own. | |
3225 } else { | |
3226 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3227 "%#lx for signal %d.", (long)oldhand, sig)); | |
3228 } | |
3229 } | |
3230 | |
3231 struct sigaction sigAct; | |
3232 sigfillset(&(sigAct.sa_mask)); | |
3233 sigAct.sa_handler = SIG_DFL; | |
3234 if (!set_installed) { | |
3235 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3236 } else { | |
3237 sigAct.sa_sigaction = signalHandler; | |
3238 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3239 } | |
10386
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3240 #if __APPLE__ |
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3241 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
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3242 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
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3243 // if the signal handler declares it will handle it on alternate stack. |
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3244 // Notice we only declare we will handle it on alt stack, but we are not |
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3245 // actually going to use real alt stack - this is just a workaround. |
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3246 // Please see ux_exception.c, method catch_mach_exception_raise for details |
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3247 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
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3248 if (sig == SIGSEGV) { |
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3249 sigAct.sa_flags |= SA_ONSTACK; |
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3250 } |
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3251 #endif |
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3252 |
3960 | 3253 // Save flags, which are set by ours |
3254 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3255 sigflags[sig] = sigAct.sa_flags; | |
3256 | |
3257 int ret = sigaction(sig, &sigAct, &oldAct); | |
3258 assert(ret == 0, "check"); | |
3259 | |
3260 void* oldhand2 = oldAct.sa_sigaction | |
3261 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3262 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3263 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3264 } | |
3265 | |
3266 // install signal handlers for signals that HotSpot needs to | |
3267 // handle in order to support Java-level exception handling. | |
3268 | |
3269 void os::Bsd::install_signal_handlers() { | |
3270 if (!signal_handlers_are_installed) { | |
3271 signal_handlers_are_installed = true; | |
3272 | |
3273 // signal-chaining | |
3274 typedef void (*signal_setting_t)(); | |
3275 signal_setting_t begin_signal_setting = NULL; | |
3276 signal_setting_t end_signal_setting = NULL; | |
3277 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3278 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3279 if (begin_signal_setting != NULL) { | |
3280 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3281 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3282 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3283 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3284 libjsig_is_loaded = true; | |
3285 assert(UseSignalChaining, "should enable signal-chaining"); | |
3286 } | |
3287 if (libjsig_is_loaded) { | |
3288 // Tell libjsig jvm is setting signal handlers | |
3289 (*begin_signal_setting)(); | |
3290 } | |
3291 | |
3292 set_signal_handler(SIGSEGV, true); | |
3293 set_signal_handler(SIGPIPE, true); | |
3294 set_signal_handler(SIGBUS, true); | |
3295 set_signal_handler(SIGILL, true); | |
3296 set_signal_handler(SIGFPE, true); | |
3297 set_signal_handler(SIGXFSZ, true); | |
3298 | |
3299 #if defined(__APPLE__) | |
3300 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
3301 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
3302 // signal handler that's placed on our process by CrashReporter. This disables | |
3303 // CrashReporter-based reporting. | |
3304 // | |
3305 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
3306 // on caught fatal signals. | |
3307 // | |
3308 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
3309 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
3310 // exception handling, while leaving the standard BSD signal handlers functional. | |
3311 kern_return_t kr; | |
3312 kr = task_set_exception_ports(mach_task_self(), | |
3313 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
3314 MACH_PORT_NULL, | |
3315 EXCEPTION_STATE_IDENTITY, | |
3316 MACHINE_THREAD_STATE); | |
3317 | |
3318 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
3319 #endif | |
3320 | |
3321 if (libjsig_is_loaded) { | |
3322 // Tell libjsig jvm finishes setting signal handlers | |
3323 (*end_signal_setting)(); | |
3324 } | |
3325 | |
3326 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3327 // and if UserSignalHandler is installed all bets are off | |
3328 if (CheckJNICalls) { | |
3329 if (libjsig_is_loaded) { | |
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3330 if (PrintJNIResolving) { |
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3331 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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3332 } |
3960 | 3333 check_signals = false; |
3334 } | |
3335 if (AllowUserSignalHandlers) { | |
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3336 if (PrintJNIResolving) { |
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3337 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
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3338 } |
3960 | 3339 check_signals = false; |
3340 } | |
3341 } | |
3342 } | |
3343 } | |
3344 | |
3345 | |
3346 ///// | |
3347 // glibc on Bsd platform uses non-documented flag | |
3348 // to indicate, that some special sort of signal | |
3349 // trampoline is used. | |
3350 // We will never set this flag, and we should | |
3351 // ignore this flag in our diagnostic | |
3352 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3353 #undef SIGNIFICANT_SIGNAL_MASK | |
3354 #endif | |
3355 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3356 | |
3357 static const char* get_signal_handler_name(address handler, | |
3358 char* buf, int buflen) { | |
3359 int offset; | |
3360 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3361 if (found) { | |
3362 // skip directory names | |
3363 const char *p1, *p2; | |
3364 p1 = buf; | |
3365 size_t len = strlen(os::file_separator()); | |
3366 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3367 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3368 } else { | |
3369 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3370 } | |
3371 return buf; | |
3372 } | |
3373 | |
3374 static void print_signal_handler(outputStream* st, int sig, | |
3375 char* buf, size_t buflen) { | |
3376 struct sigaction sa; | |
3377 | |
3378 sigaction(sig, NULL, &sa); | |
3379 | |
3380 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3381 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3382 | |
3383 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3384 | |
3385 address handler = (sa.sa_flags & SA_SIGINFO) | |
3386 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3387 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3388 | |
3389 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3390 st->print("SIG_DFL"); | |
3391 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3392 st->print("SIG_IGN"); | |
3393 } else { | |
3394 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3395 } | |
3396 | |
3397 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
3398 | |
3399 address rh = VMError::get_resetted_sighandler(sig); | |
3400 // May be, handler was resetted by VMError? | |
3401 if(rh != NULL) { | |
3402 handler = rh; | |
3403 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3404 } | |
3405 | |
3406 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
3407 | |
3408 // Check: is it our handler? | |
3409 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3410 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3411 // It is our signal handler | |
3412 // check for flags, reset system-used one! | |
3413 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3414 st->print( | |
3415 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3416 os::Bsd::get_our_sigflags(sig)); | |
3417 } | |
3418 } | |
3419 st->cr(); | |
3420 } | |
3421 | |
3422 | |
3423 #define DO_SIGNAL_CHECK(sig) \ | |
3424 if (!sigismember(&check_signal_done, sig)) \ | |
3425 os::Bsd::check_signal_handler(sig) | |
3426 | |
3427 // This method is a periodic task to check for misbehaving JNI applications | |
3428 // under CheckJNI, we can add any periodic checks here | |
3429 | |
3430 void os::run_periodic_checks() { | |
3431 | |
3432 if (check_signals == false) return; | |
3433 | |
3434 // SEGV and BUS if overridden could potentially prevent | |
3435 // generation of hs*.log in the event of a crash, debugging | |
3436 // such a case can be very challenging, so we absolutely | |
3437 // check the following for a good measure: | |
3438 DO_SIGNAL_CHECK(SIGSEGV); | |
3439 DO_SIGNAL_CHECK(SIGILL); | |
3440 DO_SIGNAL_CHECK(SIGFPE); | |
3441 DO_SIGNAL_CHECK(SIGBUS); | |
3442 DO_SIGNAL_CHECK(SIGPIPE); | |
3443 DO_SIGNAL_CHECK(SIGXFSZ); | |
3444 | |
3445 | |
3446 // ReduceSignalUsage allows the user to override these handlers | |
3447 // see comments at the very top and jvm_solaris.h | |
3448 if (!ReduceSignalUsage) { | |
3449 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3450 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3451 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3452 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3453 } | |
3454 | |
3455 DO_SIGNAL_CHECK(SR_signum); | |
3456 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3457 } | |
3458 | |
3459 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3460 | |
3461 static os_sigaction_t os_sigaction = NULL; | |
3462 | |
3463 void os::Bsd::check_signal_handler(int sig) { | |
3464 char buf[O_BUFLEN]; | |
3465 address jvmHandler = NULL; | |
3466 | |
3467 | |
3468 struct sigaction act; | |
3469 if (os_sigaction == NULL) { | |
3470 // only trust the default sigaction, in case it has been interposed | |
3471 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3472 if (os_sigaction == NULL) return; | |
3473 } | |
3474 | |
3475 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3476 | |
3477 | |
3478 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3479 | |
3480 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3481 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3482 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3483 | |
3484 | |
3485 switch(sig) { | |
3486 case SIGSEGV: | |
3487 case SIGBUS: | |
3488 case SIGFPE: | |
3489 case SIGPIPE: | |
3490 case SIGILL: | |
3491 case SIGXFSZ: | |
3492 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3493 break; | |
3494 | |
3495 case SHUTDOWN1_SIGNAL: | |
3496 case SHUTDOWN2_SIGNAL: | |
3497 case SHUTDOWN3_SIGNAL: | |
3498 case BREAK_SIGNAL: | |
3499 jvmHandler = (address)user_handler(); | |
3500 break; | |
3501 | |
3502 case INTERRUPT_SIGNAL: | |
3503 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3504 break; | |
3505 | |
3506 default: | |
3507 if (sig == SR_signum) { | |
3508 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3509 } else { | |
3510 return; | |
3511 } | |
3512 break; | |
3513 } | |
3514 | |
3515 if (thisHandler != jvmHandler) { | |
3516 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3517 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3518 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3519 // No need to check this sig any longer | |
3520 sigaddset(&check_signal_done, sig); | |
3521 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3522 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3523 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
3524 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3525 // No need to check this sig any longer | |
3526 sigaddset(&check_signal_done, sig); | |
3527 } | |
3528 | |
3529 // Dump all the signal | |
3530 if (sigismember(&check_signal_done, sig)) { | |
3531 print_signal_handlers(tty, buf, O_BUFLEN); | |
3532 } | |
3533 } | |
3534 | |
3535 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3536 | |
3537 extern bool signal_name(int signo, char* buf, size_t len); | |
3538 | |
3539 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3540 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3541 // signal | |
3542 if (!signal_name(exception_code, buf, size)) { | |
3543 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3544 } | |
3545 return buf; | |
3546 } else { | |
3547 return NULL; | |
3548 } | |
3549 } | |
3550 | |
3551 // this is called _before_ the most of global arguments have been parsed | |
3552 void os::init(void) { | |
3553 char dummy; /* used to get a guess on initial stack address */ | |
3554 // first_hrtime = gethrtime(); | |
3555 | |
3556 // With BsdThreads the JavaMain thread pid (primordial thread) | |
3557 // is different than the pid of the java launcher thread. | |
3558 // So, on Bsd, the launcher thread pid is passed to the VM | |
3559 // via the sun.java.launcher.pid property. | |
3560 // Use this property instead of getpid() if it was correctly passed. | |
3561 // See bug 6351349. | |
3562 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3563 | |
3564 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3565 | |
3566 clock_tics_per_sec = CLK_TCK; | |
3567 | |
3568 init_random(1234567); | |
3569 | |
3570 ThreadCritical::initialize(); | |
3571 | |
3572 Bsd::set_page_size(getpagesize()); | |
3573 if (Bsd::page_size() == -1) { | |
3574 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
3575 strerror(errno))); | |
3576 } | |
3577 init_page_sizes((size_t) Bsd::page_size()); | |
3578 | |
3579 Bsd::initialize_system_info(); | |
3580 | |
3581 // main_thread points to the aboriginal thread | |
3582 Bsd::_main_thread = pthread_self(); | |
3583 | |
3584 Bsd::clock_init(); | |
3585 initial_time_count = os::elapsed_counter(); | |
3586 | |
3587 #ifdef __APPLE__ | |
3588 // XXXDARWIN | |
3589 // Work around the unaligned VM callbacks in hotspot's | |
3590 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
3591 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
3592 // alignment when doing symbol lookup. To work around this, we force early | |
3593 // binding of all symbols now, thus binding when alignment is known-good. | |
3594 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
3595 #endif | |
3596 } | |
3597 | |
3598 // To install functions for atexit system call | |
3599 extern "C" { | |
3600 static void perfMemory_exit_helper() { | |
3601 perfMemory_exit(); | |
3602 } | |
3603 } | |
3604 | |
3605 // this is called _after_ the global arguments have been parsed | |
3606 jint os::init_2(void) | |
3607 { | |
3608 // Allocate a single page and mark it as readable for safepoint polling | |
3609 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3610 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
3611 | |
3612 os::set_polling_page( polling_page ); | |
3613 | |
3614 #ifndef PRODUCT | |
3615 if(Verbose && PrintMiscellaneous) | |
3616 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
3617 #endif | |
3618 | |
3619 if (!UseMembar) { | |
3620 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
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3621 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
3960 | 3622 os::set_memory_serialize_page( mem_serialize_page ); |
3623 | |
3624 #ifndef PRODUCT | |
3625 if(Verbose && PrintMiscellaneous) | |
3626 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3627 #endif | |
3628 } | |
3629 | |
3630 // initialize suspend/resume support - must do this before signal_sets_init() | |
3631 if (SR_initialize() != 0) { | |
3632 perror("SR_initialize failed"); | |
3633 return JNI_ERR; | |
3634 } | |
3635 | |
3636 Bsd::signal_sets_init(); | |
3637 Bsd::install_signal_handlers(); | |
3638 | |
3639 // Check minimum allowable stack size for thread creation and to initialize | |
3640 // the java system classes, including StackOverflowError - depends on page | |
3641 // size. Add a page for compiler2 recursion in main thread. | |
3642 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3643 // class initialization depending on 32 or 64 bit VM. | |
3644 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
3645 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
3646 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
3647 | |
3648 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3649 if (threadStackSizeInBytes != 0 && | |
3650 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
3651 tty->print_cr("\nThe stack size specified is too small, " | |
3652 "Specify at least %dk", | |
3653 os::Bsd::min_stack_allowed/ K); | |
3654 return JNI_ERR; | |
3655 } | |
3656 | |
3657 // Make the stack size a multiple of the page size so that | |
3658 // the yellow/red zones can be guarded. | |
3659 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
3660 vm_page_size())); | |
3661 | |
3662 if (MaxFDLimit) { | |
3663 // set the number of file descriptors to max. print out error | |
3664 // if getrlimit/setrlimit fails but continue regardless. | |
3665 struct rlimit nbr_files; | |
3666 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3667 if (status != 0) { | |
3668 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3669 perror("os::init_2 getrlimit failed"); | |
3670 } else { | |
3671 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3672 | |
3673 #ifdef __APPLE__ | |
3674 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
3675 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
3676 // be used instead | |
3677 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
3678 #endif | |
3679 | |
3680 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3681 if (status != 0) { | |
3682 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3683 perror("os::init_2 setrlimit failed"); | |
3684 } | |
3685 } | |
3686 } | |
3687 | |
3688 // at-exit methods are called in the reverse order of their registration. | |
3689 // atexit functions are called on return from main or as a result of a | |
3690 // call to exit(3C). There can be only 32 of these functions registered | |
3691 // and atexit() does not set errno. | |
3692 | |
3693 if (PerfAllowAtExitRegistration) { | |
3694 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3695 // atexit functions can be delayed until process exit time, which | |
3696 // can be problematic for embedded VM situations. Embedded VMs should | |
3697 // call DestroyJavaVM() to assure that VM resources are released. | |
3698 | |
3699 // note: perfMemory_exit_helper atexit function may be removed in | |
3700 // the future if the appropriate cleanup code can be added to the | |
3701 // VM_Exit VMOperation's doit method. | |
3702 if (atexit(perfMemory_exit_helper) != 0) { | |
3703 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
3704 } | |
3705 } | |
3706 | |
3707 // initialize thread priority policy | |
3708 prio_init(); | |
3709 | |
4006 | 3710 #ifdef __APPLE__ |
3711 // dynamically link to objective c gc registration | |
3712 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
3713 if (handleLibObjc != NULL) { | |
3714 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
3715 } | |
3716 #endif | |
3717 | |
3960 | 3718 return JNI_OK; |
3719 } | |
3720 | |
3721 // this is called at the end of vm_initialization | |
3722 void os::init_3(void) { } | |
3723 | |
3724 // Mark the polling page as unreadable | |
3725 void os::make_polling_page_unreadable(void) { | |
3726 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
3727 fatal("Could not disable polling page"); | |
3728 }; | |
3729 | |
3730 // Mark the polling page as readable | |
3731 void os::make_polling_page_readable(void) { | |
3732 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
3733 fatal("Could not enable polling page"); | |
3734 } | |
3735 }; | |
3736 | |
3737 int os::active_processor_count() { | |
3738 return _processor_count; | |
3739 } | |
3740 | |
4006 | 3741 void os::set_native_thread_name(const char *name) { |
3742 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
3743 // This is only supported in Snow Leopard and beyond | |
3744 if (name != NULL) { | |
3745 // Add a "Java: " prefix to the name | |
3746 char buf[MAXTHREADNAMESIZE]; | |
3747 snprintf(buf, sizeof(buf), "Java: %s", name); | |
3748 pthread_setname_np(buf); | |
3749 } | |
3750 #endif | |
3751 } | |
3752 | |
3960 | 3753 bool os::distribute_processes(uint length, uint* distribution) { |
3754 // Not yet implemented. | |
3755 return false; | |
3756 } | |
3757 | |
3758 bool os::bind_to_processor(uint processor_id) { | |
3759 // Not yet implemented. | |
3760 return false; | |
3761 } | |
3762 | |
10405 | 3763 void os::SuspendedThreadTask::internal_do_task() { |
3764 if (do_suspend(_thread->osthread())) { | |
3765 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
3766 do_task(context); | |
3767 do_resume(_thread->osthread()); | |
3768 } | |
3769 } | |
3770 | |
3960 | 3771 /// |
10405 | 3772 class PcFetcher : public os::SuspendedThreadTask { |
3773 public: | |
3774 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
3775 ExtendedPC result(); | |
3776 protected: | |
3777 void do_task(const os::SuspendedThreadTaskContext& context); | |
3778 private: | |
3779 ExtendedPC _epc; | |
3780 }; | |
3781 | |
3782 ExtendedPC PcFetcher::result() { | |
3783 guarantee(is_done(), "task is not done yet."); | |
3784 return _epc; | |
3785 } | |
3786 | |
3787 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
3788 Thread* thread = context.thread(); | |
3789 OSThread* osthread = thread->osthread(); | |
3790 if (osthread->ucontext() != NULL) { | |
3791 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
3792 } else { | |
3793 // NULL context is unexpected, double-check this is the VMThread | |
3794 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
3795 } | |
3796 } | |
3960 | 3797 |
3798 // Suspends the target using the signal mechanism and then grabs the PC before | |
3799 // resuming the target. Used by the flat-profiler only | |
3800 ExtendedPC os::get_thread_pc(Thread* thread) { | |
3801 // Make sure that it is called by the watcher for the VMThread | |
3802 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
3803 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
3804 | |
10405 | 3805 PcFetcher fetcher(thread); |
3806 fetcher.run(); | |
3807 return fetcher.result(); | |
3960 | 3808 } |
3809 | |
3810 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
3811 { | |
3812 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
3813 } | |
3814 | |
3815 //////////////////////////////////////////////////////////////////////////////// | |
3816 // debug support | |
3817 | |
3818 bool os::find(address addr, outputStream* st) { | |
3819 Dl_info dlinfo; | |
3820 memset(&dlinfo, 0, sizeof(dlinfo)); | |
11092
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|
3821 if (dladdr(addr, &dlinfo) != 0) { |
3960 | 3822 st->print(PTR_FORMAT ": ", addr); |
11092
59b052799158
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|
3823 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
3960 | 3824 st->print("%s+%#x", dlinfo.dli_sname, |
3825 addr - (intptr_t)dlinfo.dli_saddr); | |
11092
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|
3826 } else if (dlinfo.dli_fbase != NULL) { |
3960 | 3827 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
3828 } else { | |
3829 st->print("<absolute address>"); | |
3830 } | |
11092
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dcubed
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|
3831 if (dlinfo.dli_fname != NULL) { |
3960 | 3832 st->print(" in %s", dlinfo.dli_fname); |
3833 } | |
11092
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|
3834 if (dlinfo.dli_fbase != NULL) { |
3960 | 3835 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
3836 } | |
3837 st->cr(); | |
3838 | |
3839 if (Verbose) { | |
3840 // decode some bytes around the PC | |
9060
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8003310: Enable -Wunused-function when compiling with gcc
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9059
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|
3841 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
cc32ccaaf47f
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mikael
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|
3842 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
3960 | 3843 address lowest = (address) dlinfo.dli_sname; |
3844 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
3845 if (begin < lowest) begin = lowest; | |
3846 Dl_info dlinfo2; | |
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|
3847 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
3960 | 3848 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
3849 end = (address) dlinfo2.dli_saddr; | |
3850 Disassembler::decode(begin, end, st); | |
3851 } | |
3852 return true; | |
3853 } | |
3854 return false; | |
3855 } | |
3856 | |
3857 //////////////////////////////////////////////////////////////////////////////// | |
3858 // misc | |
3859 | |
3860 // This does not do anything on Bsd. This is basically a hook for being | |
3861 // able to use structured exception handling (thread-local exception filters) | |
3862 // on, e.g., Win32. | |
3863 void | |
3864 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
3865 JavaCallArguments* args, Thread* thread) { | |
3866 f(value, method, args, thread); | |
3867 } | |
3868 | |
3869 void os::print_statistics() { | |
3870 } | |
3871 | |
3872 int os::message_box(const char* title, const char* message) { | |
3873 int i; | |
3874 fdStream err(defaultStream::error_fd()); | |
3875 for (i = 0; i < 78; i++) err.print_raw("="); | |
3876 err.cr(); | |
3877 err.print_raw_cr(title); | |
3878 for (i = 0; i < 78; i++) err.print_raw("-"); | |
3879 err.cr(); | |
3880 err.print_raw_cr(message); | |
3881 for (i = 0; i < 78; i++) err.print_raw("="); | |
3882 err.cr(); | |
3883 | |
3884 char buf[16]; | |
3885 // Prevent process from exiting upon "read error" without consuming all CPU | |
3886 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
3887 | |
3888 return buf[0] == 'y' || buf[0] == 'Y'; | |
3889 } | |
3890 | |
3891 int os::stat(const char *path, struct stat *sbuf) { | |
3892 char pathbuf[MAX_PATH]; | |
3893 if (strlen(path) > MAX_PATH - 1) { | |
3894 errno = ENAMETOOLONG; | |
3895 return -1; | |
3896 } | |
3897 os::native_path(strcpy(pathbuf, path)); | |
3898 return ::stat(pathbuf, sbuf); | |
3899 } | |
3900 | |
3901 bool os::check_heap(bool force) { | |
3902 return true; | |
3903 } | |
3904 | |
3905 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
3906 return ::vsnprintf(buf, count, format, args); | |
3907 } | |
3908 | |
3909 // Is a (classpath) directory empty? | |
3910 bool os::dir_is_empty(const char* path) { | |
3911 DIR *dir = NULL; | |
3912 struct dirent *ptr; | |
3913 | |
3914 dir = opendir(path); | |
3915 if (dir == NULL) return true; | |
3916 | |
3917 /* Scan the directory */ | |
3918 bool result = true; | |
3919 char buf[sizeof(struct dirent) + MAX_PATH]; | |
3920 while (result && (ptr = ::readdir(dir)) != NULL) { | |
3921 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
3922 result = false; | |
3923 } | |
3924 } | |
3925 closedir(dir); | |
3926 return result; | |
3927 } | |
3928 | |
3929 // This code originates from JDK's sysOpen and open64_w | |
3930 // from src/solaris/hpi/src/system_md.c | |
3931 | |
3932 #ifndef O_DELETE | |
3933 #define O_DELETE 0x10000 | |
3934 #endif | |
3935 | |
3936 // Open a file. Unlink the file immediately after open returns | |
3937 // if the specified oflag has the O_DELETE flag set. | |
3938 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
3939 | |
3940 int os::open(const char *path, int oflag, int mode) { | |
3941 | |
3942 if (strlen(path) > MAX_PATH - 1) { | |
3943 errno = ENAMETOOLONG; | |
3944 return -1; | |
3945 } | |
3946 int fd; | |
3947 int o_delete = (oflag & O_DELETE); | |
3948 oflag = oflag & ~O_DELETE; | |
3949 | |
3950 fd = ::open(path, oflag, mode); | |
3951 if (fd == -1) return -1; | |
3952 | |
3953 //If the open succeeded, the file might still be a directory | |
3954 { | |
3955 struct stat buf; | |
3956 int ret = ::fstat(fd, &buf); | |
3957 int st_mode = buf.st_mode; | |
3958 | |
3959 if (ret != -1) { | |
3960 if ((st_mode & S_IFMT) == S_IFDIR) { | |
3961 errno = EISDIR; | |
3962 ::close(fd); | |
3963 return -1; | |
3964 } | |
3965 } else { | |
3966 ::close(fd); | |
3967 return -1; | |
3968 } | |
3969 } | |
3970 | |
3971 /* | |
3972 * All file descriptors that are opened in the JVM and not | |
3973 * specifically destined for a subprocess should have the | |
3974 * close-on-exec flag set. If we don't set it, then careless 3rd | |
3975 * party native code might fork and exec without closing all | |
3976 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
3977 * UNIXProcess.c), and this in turn might: | |
3978 * | |
3979 * - cause end-of-file to fail to be detected on some file | |
3980 * descriptors, resulting in mysterious hangs, or | |
3981 * | |
3982 * - might cause an fopen in the subprocess to fail on a system | |
3983 * suffering from bug 1085341. | |
3984 * | |
3985 * (Yes, the default setting of the close-on-exec flag is a Unix | |
3986 * design flaw) | |
3987 * | |
3988 * See: | |
3989 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
3990 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
3991 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
3992 */ | |
3993 #ifdef FD_CLOEXEC | |
3994 { | |
3995 int flags = ::fcntl(fd, F_GETFD); | |
3996 if (flags != -1) | |
3997 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
3998 } | |
3999 #endif | |
4000 | |
4001 if (o_delete != 0) { | |
4002 ::unlink(path); | |
4003 } | |
4004 return fd; | |
4005 } | |
4006 | |
4007 | |
4008 // create binary file, rewriting existing file if required | |
4009 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4010 int oflags = O_WRONLY | O_CREAT; | |
4011 if (!rewrite_existing) { | |
4012 oflags |= O_EXCL; | |
4013 } | |
4014 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
4015 } | |
4016 | |
4017 // return current position of file pointer | |
4018 jlong os::current_file_offset(int fd) { | |
4019 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
4020 } | |
4021 | |
4022 // move file pointer to the specified offset | |
4023 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4024 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
4025 } | |
4026 | |
4027 // This code originates from JDK's sysAvailable | |
4028 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
4029 | |
4030 int os::available(int fd, jlong *bytes) { | |
4031 jlong cur, end; | |
4032 int mode; | |
4033 struct stat buf; | |
4034 | |
4035 if (::fstat(fd, &buf) >= 0) { | |
4036 mode = buf.st_mode; | |
4037 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
4038 /* | |
4039 * XXX: is the following call interruptible? If so, this might | |
4040 * need to go through the INTERRUPT_IO() wrapper as for other | |
4041 * blocking, interruptible calls in this file. | |
4042 */ | |
4043 int n; | |
4044 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
4045 *bytes = n; | |
4046 return 1; | |
4047 } | |
4048 } | |
4049 } | |
4050 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
4051 return 0; | |
4052 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
4053 return 0; | |
4054 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
4055 return 0; | |
4056 } | |
4057 *bytes = end - cur; | |
4058 return 1; | |
4059 } | |
4060 | |
4061 int os::socket_available(int fd, jint *pbytes) { | |
4062 if (fd < 0) | |
4063 return OS_OK; | |
4064 | |
4065 int ret; | |
4066 | |
4067 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
4068 | |
4069 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
4070 // is expected to return 0 on failure and 1 on success to the jdk. | |
4071 | |
4072 return (ret == OS_ERR) ? 0 : 1; | |
4073 } | |
4074 | |
4075 // Map a block of memory. | |
6197 | 4076 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4077 char *addr, size_t bytes, bool read_only, |
4078 bool allow_exec) { | |
4079 int prot; | |
4080 int flags; | |
4081 | |
4082 if (read_only) { | |
4083 prot = PROT_READ; | |
4084 flags = MAP_SHARED; | |
4085 } else { | |
4086 prot = PROT_READ | PROT_WRITE; | |
4087 flags = MAP_PRIVATE; | |
4088 } | |
4089 | |
4090 if (allow_exec) { | |
4091 prot |= PROT_EXEC; | |
4092 } | |
4093 | |
4094 if (addr != NULL) { | |
4095 flags |= MAP_FIXED; | |
4096 } | |
4097 | |
4098 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
4099 fd, file_offset); | |
4100 if (mapped_address == MAP_FAILED) { | |
4101 return NULL; | |
4102 } | |
4103 return mapped_address; | |
4104 } | |
4105 | |
4106 | |
4107 // Remap a block of memory. | |
6197 | 4108 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4109 char *addr, size_t bytes, bool read_only, |
4110 bool allow_exec) { | |
4111 // same as map_memory() on this OS | |
4112 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4113 allow_exec); | |
4114 } | |
4115 | |
4116 | |
4117 // Unmap a block of memory. | |
6197 | 4118 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
3960 | 4119 return munmap(addr, bytes) == 0; |
4120 } | |
4121 | |
4122 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
4123 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
4124 // of a thread. | |
4125 // | |
4126 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
4127 // the fast estimate available on the platform. | |
4128 | |
4129 jlong os::current_thread_cpu_time() { | |
4130 #ifdef __APPLE__ | |
4131 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
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|
4132 #else |
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|
4133 Unimplemented(); |
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4134 return 0; |
3960 | 4135 #endif |
4136 } | |
4137 | |
4138 jlong os::thread_cpu_time(Thread* thread) { | |
8689
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4139 #ifdef __APPLE__ |
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4140 return os::thread_cpu_time(thread, true /* user + sys */); |
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|
4141 #else |
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|
4142 Unimplemented(); |
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|
4143 return 0; |
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changeset
|
4144 #endif |
3960 | 4145 } |
4146 | |
4147 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
4148 #ifdef __APPLE__ | |
4149 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
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|
4150 #else |
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|
4151 Unimplemented(); |
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4152 return 0; |
3960 | 4153 #endif |
4154 } | |
4155 | |
4156 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4157 #ifdef __APPLE__ | |
4158 struct thread_basic_info tinfo; | |
4159 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
4160 kern_return_t kr; | |
4961
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4161 thread_t mach_thread; |
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4162 |
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4163 mach_thread = thread->osthread()->thread_id(); |
3960 | 4164 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
4165 if (kr != KERN_SUCCESS) | |
4166 return -1; | |
4167 | |
4168 if (user_sys_cpu_time) { | |
4169 jlong nanos; | |
4170 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
4171 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
4172 return nanos; | |
4173 } else { | |
4174 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
4175 } | |
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4176 #else |
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4177 Unimplemented(); |
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4178 return 0; |
3960 | 4179 #endif |
4180 } | |
4181 | |
4182 | |
4183 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4184 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4185 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4186 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4187 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4188 } | |
4189 | |
4190 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4191 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4192 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4193 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4194 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4195 } | |
4196 | |
4197 bool os::is_thread_cpu_time_supported() { | |
4198 #ifdef __APPLE__ | |
4199 return true; | |
6918 | 4200 #else |
3960 | 4201 return false; |
4202 #endif | |
4203 } | |
4204 | |
4205 // System loadavg support. Returns -1 if load average cannot be obtained. | |
4206 // Bsd doesn't yet have a (official) notion of processor sets, | |
4207 // so just return the system wide load average. | |
4208 int os::loadavg(double loadavg[], int nelem) { | |
4209 return ::getloadavg(loadavg, nelem); | |
4210 } | |
4211 | |
4212 void os::pause() { | |
4213 char filename[MAX_PATH]; | |
4214 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
4215 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
4216 } else { | |
4217 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
4218 } | |
4219 | |
4220 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
4221 if (fd != -1) { | |
4222 struct stat buf; | |
4223 ::close(fd); | |
4224 while (::stat(filename, &buf) == 0) { | |
4225 (void)::poll(NULL, 0, 100); | |
4226 } | |
4227 } else { | |
4228 jio_fprintf(stderr, | |
4229 "Could not open pause file '%s', continuing immediately.\n", filename); | |
4230 } | |
4231 } | |
4232 | |
4233 | |
4234 // Refer to the comments in os_solaris.cpp park-unpark. | |
4235 // | |
4236 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
4237 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
4238 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
4239 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
4240 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
4241 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4242 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4243 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4244 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4245 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4246 // of libpthread avoids the problem, but isn't practical. | |
4247 // | |
4248 // Possible remedies: | |
4249 // | |
4250 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4251 // This is palliative and probabilistic, however. If the thread is preempted | |
4252 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4253 // than the minimum period may have passed, and the abstime may be stale (in the | |
4254 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4255 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4256 // | |
4257 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4258 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4259 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4260 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4261 // thread. | |
4262 // | |
4263 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4264 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4265 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4266 // This also works well. In fact it avoids kernel-level scalability impediments | |
4267 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4268 // timers in a graceful fashion. | |
4269 // | |
4270 // 4. When the abstime value is in the past it appears that control returns | |
4271 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4272 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4273 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4274 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4275 // It may be possible to avoid reinitialization by checking the return | |
4276 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4277 // condvar we must establish the invariant that cond_signal() is only called | |
4278 // within critical sections protected by the adjunct mutex. This prevents | |
4279 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4280 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4281 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4282 // | |
4283 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4284 // structure when a condvar is used or initialized. cond_destroy() would | |
4285 // release the helper structure. Our reinitialize-after-timedwait fix | |
4286 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4287 // | |
4288 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4289 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4290 // and only enabling the work-around for vulnerable environments. | |
4291 | |
4292 // utility to compute the abstime argument to timedwait: | |
4293 // millis is the relative timeout time | |
4294 // abstime will be the absolute timeout time | |
4295 // TODO: replace compute_abstime() with unpackTime() | |
4296 | |
4297 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
4298 if (millis < 0) millis = 0; | |
4299 struct timeval now; | |
4300 int status = gettimeofday(&now, NULL); | |
4301 assert(status == 0, "gettimeofday"); | |
4302 jlong seconds = millis / 1000; | |
4303 millis %= 1000; | |
4304 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4305 seconds = 50000000; | |
4306 } | |
4307 abstime->tv_sec = now.tv_sec + seconds; | |
4308 long usec = now.tv_usec + millis * 1000; | |
4309 if (usec >= 1000000) { | |
4310 abstime->tv_sec += 1; | |
4311 usec -= 1000000; | |
4312 } | |
4313 abstime->tv_nsec = usec * 1000; | |
4314 return abstime; | |
4315 } | |
4316 | |
4317 | |
4318 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4319 // Conceptually TryPark() should be equivalent to park(0). | |
4320 | |
4321 int os::PlatformEvent::TryPark() { | |
4322 for (;;) { | |
4323 const int v = _Event ; | |
4324 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4325 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4326 } | |
4327 } | |
4328 | |
4329 void os::PlatformEvent::park() { // AKA "down()" | |
4330 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4331 // may call park(). | |
4332 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4333 int v ; | |
4334 for (;;) { | |
4335 v = _Event ; | |
4336 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4337 } | |
4338 guarantee (v >= 0, "invariant") ; | |
4339 if (v == 0) { | |
4340 // Do this the hard way by blocking ... | |
4341 int status = pthread_mutex_lock(_mutex); | |
4342 assert_status(status == 0, status, "mutex_lock"); | |
4343 guarantee (_nParked == 0, "invariant") ; | |
4344 ++ _nParked ; | |
4345 while (_Event < 0) { | |
4346 status = pthread_cond_wait(_cond, _mutex); | |
4347 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4348 // Treat this the same as if the wait was interrupted | |
4349 if (status == ETIMEDOUT) { status = EINTR; } | |
4350 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4351 } | |
4352 -- _nParked ; | |
4353 | |
4354 _Event = 0 ; | |
4355 status = pthread_mutex_unlock(_mutex); | |
4356 assert_status(status == 0, status, "mutex_unlock"); | |
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4357 // Paranoia to ensure our locked and lock-free paths interact |
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4358 // correctly with each other. |
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4359 OrderAccess::fence(); |
3960 | 4360 } |
4361 guarantee (_Event >= 0, "invariant") ; | |
4362 } | |
4363 | |
4364 int os::PlatformEvent::park(jlong millis) { | |
4365 guarantee (_nParked == 0, "invariant") ; | |
4366 | |
4367 int v ; | |
4368 for (;;) { | |
4369 v = _Event ; | |
4370 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4371 } | |
4372 guarantee (v >= 0, "invariant") ; | |
4373 if (v != 0) return OS_OK ; | |
4374 | |
4375 // We do this the hard way, by blocking the thread. | |
4376 // Consider enforcing a minimum timeout value. | |
4377 struct timespec abst; | |
4378 compute_abstime(&abst, millis); | |
4379 | |
4380 int ret = OS_TIMEOUT; | |
4381 int status = pthread_mutex_lock(_mutex); | |
4382 assert_status(status == 0, status, "mutex_lock"); | |
4383 guarantee (_nParked == 0, "invariant") ; | |
4384 ++_nParked ; | |
4385 | |
4386 // Object.wait(timo) will return because of | |
4387 // (a) notification | |
4388 // (b) timeout | |
4389 // (c) thread.interrupt | |
4390 // | |
4391 // Thread.interrupt and object.notify{All} both call Event::set. | |
4392 // That is, we treat thread.interrupt as a special case of notification. | |
4393 // The underlying Solaris implementation, cond_timedwait, admits | |
4394 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4395 // JVM from making those visible to Java code. As such, we must | |
4396 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4397 // | |
4398 // TODO: properly differentiate simultaneous notify+interrupt. | |
4399 // In that case, we should propagate the notify to another waiter. | |
4400 | |
4401 while (_Event < 0) { | |
4402 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
4403 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4404 pthread_cond_destroy (_cond); | |
4405 pthread_cond_init (_cond, NULL) ; | |
4406 } | |
4407 assert_status(status == 0 || status == EINTR || | |
4408 status == ETIMEDOUT, | |
4409 status, "cond_timedwait"); | |
4410 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4411 if (status == ETIMEDOUT) break ; | |
4412 // We consume and ignore EINTR and spurious wakeups. | |
4413 } | |
4414 --_nParked ; | |
4415 if (_Event >= 0) { | |
4416 ret = OS_OK; | |
4417 } | |
4418 _Event = 0 ; | |
4419 status = pthread_mutex_unlock(_mutex); | |
4420 assert_status(status == 0, status, "mutex_unlock"); | |
4421 assert (_nParked == 0, "invariant") ; | |
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4422 // Paranoia to ensure our locked and lock-free paths interact |
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4423 // correctly with each other. |
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4424 OrderAccess::fence(); |
3960 | 4425 return ret; |
4426 } | |
4427 | |
4428 void os::PlatformEvent::unpark() { | |
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4429 // Transitions for _Event: |
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4430 // 0 :=> 1 |
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4431 // 1 :=> 1 |
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4432 // -1 :=> either 0 or 1; must signal target thread |
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4433 // That is, we can safely transition _Event from -1 to either |
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4434 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4435 // unpark() calls. |
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4436 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4437 // |
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4438 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4439 // that it will take two back-to-back park() calls for the owning |
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4440 // thread to block. This has the benefit of forcing a spurious return |
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4441 // from the first park() call after an unpark() call which will help |
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4442 // shake out uses of park() and unpark() without condition variables. |
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4443 |
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4444 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4445 |
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4446 // Wait for the thread associated with the event to vacate |
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4447 int status = pthread_mutex_lock(_mutex); |
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4448 assert_status(status == 0, status, "mutex_lock"); |
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4449 int AnyWaiters = _nParked; |
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4450 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4451 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4452 AnyWaiters = 0; |
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4453 pthread_cond_signal(_cond); |
3960 | 4454 } |
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4455 status = pthread_mutex_unlock(_mutex); |
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4456 assert_status(status == 0, status, "mutex_unlock"); |
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4457 if (AnyWaiters != 0) { |
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4458 status = pthread_cond_signal(_cond); |
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4459 assert_status(status == 0, status, "cond_signal"); |
3960 | 4460 } |
4461 | |
4462 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4463 // This is safe and avoids a common class of futile wakeups. In rare | |
4464 // circumstances this can cause a thread to return prematurely from | |
4465 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4466 // simply re-test the condition and re-park itself. | |
4467 } | |
4468 | |
4469 | |
4470 // JSR166 | |
4471 // ------------------------------------------------------- | |
4472 | |
4473 /* | |
4474 * The solaris and bsd implementations of park/unpark are fairly | |
4475 * conservative for now, but can be improved. They currently use a | |
4476 * mutex/condvar pair, plus a a count. | |
4477 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4478 * sets count to 1 and signals condvar. Only one thread ever waits | |
4479 * on the condvar. Contention seen when trying to park implies that someone | |
4480 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4481 * is no need to track notifications. | |
4482 */ | |
4483 | |
4484 #define MAX_SECS 100000000 | |
4485 /* | |
4486 * This code is common to bsd and solaris and will be moved to a | |
4487 * common place in dolphin. | |
4488 * | |
4489 * The passed in time value is either a relative time in nanoseconds | |
4490 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4491 * into suitable seconds and nanoseconds components and stored in the | |
4492 * given timespec structure. | |
4493 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4494 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
4495 * overflow if times way in the future are given. Further on Solaris versions | |
4496 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4497 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
4498 * As it will be 28 years before "now + 100000000" will overflow we can | |
4499 * ignore overflow and just impose a hard-limit on seconds using the value | |
4500 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4501 * years from "now". | |
4502 */ | |
4503 | |
4504 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
4505 assert (time > 0, "convertTime"); | |
4506 | |
4507 struct timeval now; | |
4508 int status = gettimeofday(&now, NULL); | |
4509 assert(status == 0, "gettimeofday"); | |
4510 | |
4511 time_t max_secs = now.tv_sec + MAX_SECS; | |
4512 | |
4513 if (isAbsolute) { | |
4514 jlong secs = time / 1000; | |
4515 if (secs > max_secs) { | |
4516 absTime->tv_sec = max_secs; | |
4517 } | |
4518 else { | |
4519 absTime->tv_sec = secs; | |
4520 } | |
4521 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4522 } | |
4523 else { | |
4524 jlong secs = time / NANOSECS_PER_SEC; | |
4525 if (secs >= MAX_SECS) { | |
4526 absTime->tv_sec = max_secs; | |
4527 absTime->tv_nsec = 0; | |
4528 } | |
4529 else { | |
4530 absTime->tv_sec = now.tv_sec + secs; | |
4531 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4532 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4533 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4534 ++absTime->tv_sec; // note: this must be <= max_secs | |
4535 } | |
4536 } | |
4537 } | |
4538 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4539 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4540 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4541 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4542 } | |
4543 | |
4544 void Parker::park(bool isAbsolute, jlong time) { | |
7629
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4545 // Ideally we'd do something useful while spinning, such |
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4546 // as calling unpackTime(). |
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4547 |
3960 | 4548 // Optional fast-path check: |
4549 // Return immediately if a permit is available. | |
7629
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4550 // We depend on Atomic::xchg() having full barrier semantics |
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4551 // since we are doing a lock-free update to _counter. |
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4552 if (Atomic::xchg(0, &_counter) > 0) return; |
3960 | 4553 |
4554 Thread* thread = Thread::current(); | |
4555 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4556 JavaThread *jt = (JavaThread *)thread; | |
4557 | |
4558 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4559 // Check interrupt before trying to wait | |
4560 if (Thread::is_interrupted(thread, false)) { | |
4561 return; | |
4562 } | |
4563 | |
4564 // Next, demultiplex/decode time arguments | |
4565 struct timespec absTime; | |
4566 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
4567 return; | |
4568 } | |
4569 if (time > 0) { | |
4570 unpackTime(&absTime, isAbsolute, time); | |
4571 } | |
4572 | |
4573 | |
4574 // Enter safepoint region | |
4575 // Beware of deadlocks such as 6317397. | |
4576 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4577 // In particular a thread must never block on the Threads_lock while | |
4578 // holding the Parker:: mutex. If safepoints are pending both the | |
4579 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4580 ThreadBlockInVM tbivm(jt); | |
4581 | |
4582 // Don't wait if cannot get lock since interference arises from | |
4583 // unblocking. Also. check interrupt before trying wait | |
4584 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4585 return; | |
4586 } | |
4587 | |
4588 int status ; | |
4589 if (_counter > 0) { // no wait needed | |
4590 _counter = 0; | |
4591 status = pthread_mutex_unlock(_mutex); | |
4592 assert (status == 0, "invariant") ; | |
7629
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4593 // Paranoia to ensure our locked and lock-free paths interact |
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4594 // correctly with each other and Java-level accesses. |
3960 | 4595 OrderAccess::fence(); |
4596 return; | |
4597 } | |
4598 | |
4599 #ifdef ASSERT | |
4600 // Don't catch signals while blocked; let the running threads have the signals. | |
4601 // (This allows a debugger to break into the running thread.) | |
4602 sigset_t oldsigs; | |
4603 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
4604 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4605 #endif | |
4606 | |
4607 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
4608 jt->set_suspend_equivalent(); | |
4609 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
4610 | |
4611 if (time == 0) { | |
4612 status = pthread_cond_wait (_cond, _mutex) ; | |
4613 } else { | |
4614 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
4615 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4616 pthread_cond_destroy (_cond) ; | |
4617 pthread_cond_init (_cond, NULL); | |
4618 } | |
4619 } | |
4620 assert_status(status == 0 || status == EINTR || | |
4621 status == ETIMEDOUT, | |
4622 status, "cond_timedwait"); | |
4623 | |
4624 #ifdef ASSERT | |
4625 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
4626 #endif | |
4627 | |
4628 _counter = 0 ; | |
4629 status = pthread_mutex_unlock(_mutex) ; | |
4630 assert_status(status == 0, status, "invariant") ; | |
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4631 // Paranoia to ensure our locked and lock-free paths interact |
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4632 // correctly with each other and Java-level accesses. |
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4633 OrderAccess::fence(); |
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4634 |
3960 | 4635 // If externally suspended while waiting, re-suspend |
4636 if (jt->handle_special_suspend_equivalent_condition()) { | |
4637 jt->java_suspend_self(); | |
4638 } | |
4639 } | |
4640 | |
4641 void Parker::unpark() { | |
4642 int s, status ; | |
4643 status = pthread_mutex_lock(_mutex); | |
4644 assert (status == 0, "invariant") ; | |
4645 s = _counter; | |
4646 _counter = 1; | |
4647 if (s < 1) { | |
4648 if (WorkAroundNPTLTimedWaitHang) { | |
4649 status = pthread_cond_signal (_cond) ; | |
4650 assert (status == 0, "invariant") ; | |
4651 status = pthread_mutex_unlock(_mutex); | |
4652 assert (status == 0, "invariant") ; | |
4653 } else { | |
4654 status = pthread_mutex_unlock(_mutex); | |
4655 assert (status == 0, "invariant") ; | |
4656 status = pthread_cond_signal (_cond) ; | |
4657 assert (status == 0, "invariant") ; | |
4658 } | |
4659 } else { | |
4660 pthread_mutex_unlock(_mutex); | |
4661 assert (status == 0, "invariant") ; | |
4662 } | |
4663 } | |
4664 | |
4665 | |
4666 /* Darwin has no "environ" in a dynamic library. */ | |
4667 #ifdef __APPLE__ | |
4668 #include <crt_externs.h> | |
4669 #define environ (*_NSGetEnviron()) | |
4670 #else | |
4671 extern char** environ; | |
4672 #endif | |
4673 | |
4674 // Run the specified command in a separate process. Return its exit value, | |
4675 // or -1 on failure (e.g. can't fork a new process). | |
4676 // Unlike system(), this function can be called from signal handler. It | |
4677 // doesn't block SIGINT et al. | |
4678 int os::fork_and_exec(char* cmd) { | |
4679 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
4680 | |
4681 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
4682 // pthread_atfork handlers and reset pthread library. All we need is a | |
4683 // separate process to execve. Make a direct syscall to fork process. | |
4684 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
4685 // the best... | |
4686 pid_t pid = fork(); | |
4687 | |
4688 if (pid < 0) { | |
4689 // fork failed | |
4690 return -1; | |
4691 | |
4692 } else if (pid == 0) { | |
4693 // child process | |
4694 | |
4695 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
4696 // first to kill every thread on the thread list. Because this list is | |
4697 // not reset by fork() (see notes above), execve() will instead kill | |
4698 // every thread in the parent process. We know this is the only thread | |
4699 // in the new process, so make a system call directly. | |
4700 // IA64 should use normal execve() from glibc to match the glibc fork() | |
4701 // above. | |
4702 execve("/bin/sh", (char* const*)argv, environ); | |
4703 | |
4704 // execve failed | |
4705 _exit(-1); | |
4706 | |
4707 } else { | |
4708 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
4709 // care about the actual exit code, for now. | |
4710 | |
4711 int status; | |
4712 | |
4713 // Wait for the child process to exit. This returns immediately if | |
4714 // the child has already exited. */ | |
4715 while (waitpid(pid, &status, 0) < 0) { | |
4716 switch (errno) { | |
4717 case ECHILD: return 0; | |
4718 case EINTR: break; | |
4719 default: return -1; | |
4720 } | |
4721 } | |
4722 | |
4723 if (WIFEXITED(status)) { | |
4724 // The child exited normally; get its exit code. | |
4725 return WEXITSTATUS(status); | |
4726 } else if (WIFSIGNALED(status)) { | |
4727 // The child exited because of a signal | |
4728 // The best value to return is 0x80 + signal number, | |
4729 // because that is what all Unix shells do, and because | |
4730 // it allows callers to distinguish between process exit and | |
4731 // process death by signal. | |
4732 return 0x80 + WTERMSIG(status); | |
4733 } else { | |
4734 // Unknown exit code; pass it through | |
4735 return status; | |
4736 } | |
4737 } | |
4738 } | |
4739 | |
4740 // is_headless_jre() | |
4741 // | |
4082
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4006
diff
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4742 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
3960 | 4743 // in order to report if we are running in a headless jre |
4744 // | |
4082
36b057451829
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4745 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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4746 // as libawt.so, and renamed libawt_xawt.so |
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|
4747 // |
3960 | 4748 bool os::is_headless_jre() { |
4749 struct stat statbuf; | |
4750 char buf[MAXPATHLEN]; | |
4751 char libmawtpath[MAXPATHLEN]; | |
4006 | 4752 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
5921 | 4753 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
3960 | 4754 char *p; |
4755 | |
4756 // Get path to libjvm.so | |
4757 os::jvm_path(buf, sizeof(buf)); | |
4758 | |
4759 // Get rid of libjvm.so | |
4760 p = strrchr(buf, '/'); | |
4761 if (p == NULL) return false; | |
4762 else *p = '\0'; | |
4763 | |
4764 // Get rid of client or server | |
4765 p = strrchr(buf, '/'); | |
4766 if (p == NULL) return false; | |
4767 else *p = '\0'; | |
4768 | |
4769 // check xawt/libmawt.so | |
4770 strcpy(libmawtpath, buf); | |
4771 strcat(libmawtpath, xawtstr); | |
4772 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
4773 | |
4082
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|
4774 // check libawt_xawt.so |
3960 | 4775 strcpy(libmawtpath, buf); |
4082
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|
4776 strcat(libmawtpath, new_xawtstr); |
3960 | 4777 if (::stat(libmawtpath, &statbuf) == 0) return false; |
4778 | |
4779 return true; | |
4780 } | |
6200
65906dc96aa1
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|
4781 |
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|
4782 // Get the default path to the core file |
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|
4783 // Returns the length of the string |
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|
4784 int os::get_core_path(char* buffer, size_t bufferSize) { |
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4785 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
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changeset
|
4786 |
65906dc96aa1
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6197
diff
changeset
|
4787 // Truncate if theoretical string was longer than bufferSize |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
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6197
diff
changeset
|
4788 n = MIN2(n, (int)bufferSize); |
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7129724: MAC: Core file location is wrong in crash report
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6197
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changeset
|
4789 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
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changeset
|
4790 return n; |
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|
4791 } |
10405 | 4792 |
12110
4c84d351cca9
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parents:
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changeset
|
4793 #ifndef PRODUCT |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
4794 void TestReserveMemorySpecial_test() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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changeset
|
4795 // No tests available for this platform |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
4796 } |
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|
4797 #endif |