Mercurial > hg > graal-jvmci-8
annotate src/os/bsd/vm/os_bsd.cpp @ 10986:1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
Summary: Fixed NMT race condition for realloc, uncommit and release
Reviewed-by: coleenp, ccheung
author | zgu |
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date | Tue, 18 Jun 2013 08:44:08 -0400 |
parents | a837fa3d3f86 |
children | 59b052799158 f4f6ae481e1a |
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> | |
103 | |
104 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
105 # include <elf.h> | |
106 #endif | |
107 | |
108 #ifdef __APPLE__ | |
4006 | 109 # include <mach/mach.h> // semaphore_* API |
110 # include <mach-o/dyld.h> | |
111 # include <sys/proc_info.h> | |
112 # include <objc/objc-auto.h> | |
3960 | 113 #endif |
114 | |
115 #ifndef MAP_ANONYMOUS | |
116 #define MAP_ANONYMOUS MAP_ANON | |
117 #endif | |
118 | |
119 #define MAX_PATH (2 * K) | |
120 | |
121 // for timer info max values which include all bits | |
122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
123 | |
124 #define LARGEPAGES_BIT (1 << 6) | |
125 //////////////////////////////////////////////////////////////////////////////// | |
126 // global variables | |
127 julong os::Bsd::_physical_memory = 0; | |
128 | |
129 | |
130 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
131 pthread_t os::Bsd::_main_thread; | |
132 int os::Bsd::_page_size = -1; | |
133 | |
134 static jlong initial_time_count=0; | |
135 | |
136 static int clock_tics_per_sec = 100; | |
137 | |
138 // For diagnostics to print a message once. see run_periodic_checks | |
139 static sigset_t check_signal_done; | |
6918 | 140 static bool check_signals = true; |
3960 | 141 |
142 static pid_t _initial_pid = 0; | |
143 | |
144 /* Signal number used to suspend/resume a thread */ | |
145 | |
146 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
147 static int SR_signum = SIGUSR2; | |
148 sigset_t SR_sigset; | |
149 | |
150 | |
151 //////////////////////////////////////////////////////////////////////////////// | |
152 // utility functions | |
153 | |
154 static int SR_initialize(); | |
155 | |
156 julong os::available_memory() { | |
157 return Bsd::available_memory(); | |
158 } | |
159 | |
160 julong os::Bsd::available_memory() { | |
161 // XXXBSD: this is just a stopgap implementation | |
162 return physical_memory() >> 2; | |
163 } | |
164 | |
165 julong os::physical_memory() { | |
166 return Bsd::physical_memory(); | |
167 } | |
168 | |
169 //////////////////////////////////////////////////////////////////////////////// | |
170 // environment support | |
171 | |
172 bool os::getenv(const char* name, char* buf, int len) { | |
173 const char* val = ::getenv(name); | |
174 if (val != NULL && strlen(val) < (size_t)len) { | |
175 strcpy(buf, val); | |
176 return true; | |
177 } | |
178 if (len > 0) buf[0] = 0; // return a null string | |
179 return false; | |
180 } | |
181 | |
182 | |
183 // Return true if user is running as root. | |
184 | |
185 bool os::have_special_privileges() { | |
186 static bool init = false; | |
187 static bool privileges = false; | |
188 if (!init) { | |
189 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
190 init = true; | |
191 } | |
192 return privileges; | |
193 } | |
194 | |
195 | |
196 | |
197 // Cpu architecture string | |
198 #if defined(ZERO) | |
199 static char cpu_arch[] = ZERO_LIBARCH; | |
200 #elif defined(IA64) | |
201 static char cpu_arch[] = "ia64"; | |
202 #elif defined(IA32) | |
203 static char cpu_arch[] = "i386"; | |
204 #elif defined(AMD64) | |
205 static char cpu_arch[] = "amd64"; | |
206 #elif defined(ARM) | |
207 static char cpu_arch[] = "arm"; | |
208 #elif defined(PPC) | |
209 static char cpu_arch[] = "ppc"; | |
210 #elif defined(SPARC) | |
211 # ifdef _LP64 | |
212 static char cpu_arch[] = "sparcv9"; | |
213 # else | |
214 static char cpu_arch[] = "sparc"; | |
215 # endif | |
216 #else | |
217 #error Add appropriate cpu_arch setting | |
218 #endif | |
219 | |
4846 | 220 // Compiler variant |
221 #ifdef COMPILER2 | |
222 #define COMPILER_VARIANT "server" | |
223 #else | |
224 #define COMPILER_VARIANT "client" | |
225 #endif | |
3960 | 226 |
6918 | 227 |
3960 | 228 void os::Bsd::initialize_system_info() { |
229 int mib[2]; | |
230 size_t len; | |
231 int cpu_val; | |
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232 julong mem_val; |
3960 | 233 |
234 /* get processors count via hw.ncpus sysctl */ | |
235 mib[0] = CTL_HW; | |
236 mib[1] = HW_NCPU; | |
237 len = sizeof(cpu_val); | |
238 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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239 assert(len == sizeof(cpu_val), "unexpected data size"); |
3960 | 240 set_processor_count(cpu_val); |
241 } | |
242 else { | |
243 set_processor_count(1); // fallback | |
244 } | |
245 | |
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246 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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247 * since it returns a 64 bit value) |
3960 | 248 */ |
249 mib[0] = CTL_HW; | |
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250 mib[1] = HW_MEMSIZE; |
3960 | 251 len = sizeof(mem_val); |
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252 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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253 assert(len == sizeof(mem_val), "unexpected data size"); |
3960 | 254 _physical_memory = mem_val; |
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255 } else { |
3960 | 256 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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257 } |
3960 | 258 |
259 #ifdef __OpenBSD__ | |
260 { | |
261 // limit _physical_memory memory view on OpenBSD since | |
262 // datasize rlimit restricts us anyway. | |
263 struct rlimit limits; | |
264 getrlimit(RLIMIT_DATA, &limits); | |
265 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
266 } | |
267 #endif | |
268 } | |
269 | |
4006 | 270 #ifdef __APPLE__ |
271 static const char *get_home() { | |
272 const char *home_dir = ::getenv("HOME"); | |
273 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
274 struct passwd *passwd_info = getpwuid(geteuid()); | |
275 if (passwd_info != NULL) { | |
276 home_dir = passwd_info->pw_dir; | |
277 } | |
278 } | |
279 | |
280 return home_dir; | |
281 } | |
282 #endif | |
283 | |
3960 | 284 void os::init_system_properties_values() { |
285 // char arch[12]; | |
286 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
287 | |
288 // The next steps are taken in the product version: | |
289 // | |
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290 // Obtain the JAVA_HOME value from the location of libjvm.so. |
3960 | 291 // This library should be located at: |
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292 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
3960 | 293 // |
294 // If "/jre/lib/" appears at the right place in the path, then we | |
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295 // assume libjvm.so is installed in a JDK and we use this path. |
3960 | 296 // |
297 // Otherwise exit with message: "Could not create the Java virtual machine." | |
298 // | |
299 // The following extra steps are taken in the debugging version: | |
300 // | |
301 // If "/jre/lib/" does NOT appear at the right place in the path | |
302 // instead of exit check for $JAVA_HOME environment variable. | |
303 // | |
304 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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305 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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306 // it looks like libjvm.so is installed there |
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307 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
3960 | 308 // |
309 // Otherwise exit. | |
310 // | |
311 // Important note: if the location of libjvm.so changes this | |
312 // code needs to be changed accordingly. | |
313 | |
314 // The next few definitions allow the code to be verbatim: | |
6197 | 315 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
3960 | 316 #define getenv(n) ::getenv(n) |
317 | |
318 /* | |
319 * See ld(1): | |
320 * The linker uses the following search paths to locate required | |
321 * shared libraries: | |
322 * 1: ... | |
323 * ... | |
324 * 7: The default directories, normally /lib and /usr/lib. | |
325 */ | |
326 #ifndef DEFAULT_LIBPATH | |
327 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
328 #endif | |
329 | |
330 #define EXTENSIONS_DIR "/lib/ext" | |
331 #define ENDORSED_DIR "/lib/endorsed" | |
332 #define REG_DIR "/usr/java/packages" | |
333 | |
4006 | 334 #ifdef __APPLE__ |
335 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
336 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
337 const char *user_home_dir = get_home(); | |
338 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
339 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
340 sizeof(SYS_EXTENSIONS_DIRS); | |
341 #endif | |
342 | |
3960 | 343 { |
344 /* sysclasspath, java_home, dll_dir */ | |
345 { | |
346 char *home_path; | |
347 char *dll_path; | |
348 char *pslash; | |
349 char buf[MAXPATHLEN]; | |
350 os::jvm_path(buf, sizeof(buf)); | |
351 | |
352 // Found the full path to libjvm.so. | |
353 // Now cut the path to <java_home>/jre if we can. | |
354 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
355 pslash = strrchr(buf, '/'); | |
356 if (pslash != NULL) | |
357 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
358 dll_path = malloc(strlen(buf) + 1); | |
359 if (dll_path == NULL) | |
360 return; | |
361 strcpy(dll_path, buf); | |
362 Arguments::set_dll_dir(dll_path); | |
363 | |
364 if (pslash != NULL) { | |
365 pslash = strrchr(buf, '/'); | |
366 if (pslash != NULL) { | |
4006 | 367 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
368 #ifndef __APPLE__ | |
3960 | 369 pslash = strrchr(buf, '/'); |
370 if (pslash != NULL) | |
371 *pslash = '\0'; /* get rid of /lib */ | |
4006 | 372 #endif |
3960 | 373 } |
374 } | |
375 | |
376 home_path = malloc(strlen(buf) + 1); | |
377 if (home_path == NULL) | |
378 return; | |
379 strcpy(home_path, buf); | |
380 Arguments::set_java_home(home_path); | |
381 | |
382 if (!set_boot_path('/', ':')) | |
383 return; | |
384 } | |
385 | |
386 /* | |
387 * Where to look for native libraries | |
388 * | |
389 * Note: Due to a legacy implementation, most of the library path | |
390 * is set in the launcher. This was to accomodate linking restrictions | |
391 * on legacy Bsd implementations (which are no longer supported). | |
392 * Eventually, all the library path setting will be done here. | |
393 * | |
394 * However, to prevent the proliferation of improperly built native | |
395 * libraries, the new path component /usr/java/packages is added here. | |
396 * Eventually, all the library path setting will be done here. | |
397 */ | |
398 { | |
399 char *ld_library_path; | |
400 | |
401 /* | |
402 * Construct the invariant part of ld_library_path. Note that the | |
403 * space for the colon and the trailing null are provided by the | |
404 * nulls included by the sizeof operator (so actually we allocate | |
405 * a byte more than necessary). | |
406 */ | |
4006 | 407 #ifdef __APPLE__ |
408 ld_library_path = (char *) malloc(system_ext_size); | |
409 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
410 #else | |
3960 | 411 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
412 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
413 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
4006 | 414 #endif |
3960 | 415 |
416 /* | |
417 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
418 * should always exist (until the legacy problem cited above is | |
419 * addressed). | |
420 */ | |
421 #ifdef __APPLE__ | |
4006 | 422 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
423 char *l = getenv("JAVA_LIBRARY_PATH"); | |
424 if (l != NULL) { | |
425 char *t = ld_library_path; | |
426 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
427 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
428 sprintf(ld_library_path, "%s:%s", l, t); | |
429 free(t); | |
430 } | |
431 | |
3960 | 432 char *v = getenv("DYLD_LIBRARY_PATH"); |
433 #else | |
434 char *v = getenv("LD_LIBRARY_PATH"); | |
435 #endif | |
436 if (v != NULL) { | |
437 char *t = ld_library_path; | |
438 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
439 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
440 sprintf(ld_library_path, "%s:%s", v, t); | |
4006 | 441 free(t); |
3960 | 442 } |
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443 |
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444 #ifdef __APPLE__ |
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445 // Apple's Java6 has "." at the beginning of java.library.path. |
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446 // OpenJDK on Windows has "." at the end of java.library.path. |
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447 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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448 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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449 // "." is appended to the end of java.library.path. Yes, this |
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450 // could cause a change in behavior, but Apple's Java6 behavior |
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451 // can be achieved by putting "." at the beginning of the |
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452 // JAVA_LIBRARY_PATH environment variable. |
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453 { |
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454 char *t = ld_library_path; |
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455 // that's +3 for appending ":." and the trailing '\0' |
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456 ld_library_path = (char *) malloc(strlen(t) + 3); |
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457 sprintf(ld_library_path, "%s:%s", t, "."); |
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458 free(t); |
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459 } |
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460 #endif |
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461 |
3960 | 462 Arguments::set_library_path(ld_library_path); |
463 } | |
464 | |
465 /* | |
466 * Extensions directories. | |
467 * | |
468 * Note that the space for the colon and the trailing null are provided | |
469 * by the nulls included by the sizeof operator (so actually one byte more | |
470 * than necessary is allocated). | |
471 */ | |
472 { | |
4006 | 473 #ifdef __APPLE__ |
474 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
475 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
476 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
477 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
478 #else | |
3960 | 479 char *buf = malloc(strlen(Arguments::get_java_home()) + |
480 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
481 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
482 Arguments::get_java_home()); | |
4006 | 483 #endif |
484 | |
3960 | 485 Arguments::set_ext_dirs(buf); |
486 } | |
487 | |
488 /* Endorsed standards default directory. */ | |
489 { | |
490 char * buf; | |
491 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
492 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
493 Arguments::set_endorsed_dirs(buf); | |
494 } | |
495 } | |
496 | |
4006 | 497 #ifdef __APPLE__ |
498 #undef SYS_EXTENSIONS_DIR | |
499 #endif | |
3960 | 500 #undef malloc |
501 #undef getenv | |
502 #undef EXTENSIONS_DIR | |
503 #undef ENDORSED_DIR | |
504 | |
505 // Done | |
506 return; | |
507 } | |
508 | |
509 //////////////////////////////////////////////////////////////////////////////// | |
510 // breakpoint support | |
511 | |
512 void os::breakpoint() { | |
513 BREAKPOINT; | |
514 } | |
515 | |
516 extern "C" void breakpoint() { | |
517 // use debugger to set breakpoint here | |
518 } | |
519 | |
520 //////////////////////////////////////////////////////////////////////////////// | |
521 // signal support | |
522 | |
523 debug_only(static bool signal_sets_initialized = false); | |
524 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
525 | |
526 bool os::Bsd::is_sig_ignored(int sig) { | |
527 struct sigaction oact; | |
528 sigaction(sig, (struct sigaction*)NULL, &oact); | |
529 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
530 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
531 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
532 return true; | |
533 else | |
534 return false; | |
535 } | |
536 | |
537 void os::Bsd::signal_sets_init() { | |
538 // Should also have an assertion stating we are still single-threaded. | |
539 assert(!signal_sets_initialized, "Already initialized"); | |
540 // Fill in signals that are necessarily unblocked for all threads in | |
541 // the VM. Currently, we unblock the following signals: | |
542 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
543 // by -Xrs (=ReduceSignalUsage)); | |
544 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
545 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
546 // the dispositions or masks wrt these signals. | |
547 // Programs embedding the VM that want to use the above signals for their | |
548 // own purposes must, at this time, use the "-Xrs" option to prevent | |
549 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
550 // (See bug 4345157, and other related bugs). | |
551 // In reality, though, unblocking these signals is really a nop, since | |
552 // these signals are not blocked by default. | |
553 sigemptyset(&unblocked_sigs); | |
554 sigemptyset(&allowdebug_blocked_sigs); | |
555 sigaddset(&unblocked_sigs, SIGILL); | |
556 sigaddset(&unblocked_sigs, SIGSEGV); | |
557 sigaddset(&unblocked_sigs, SIGBUS); | |
558 sigaddset(&unblocked_sigs, SIGFPE); | |
559 sigaddset(&unblocked_sigs, SR_signum); | |
560 | |
561 if (!ReduceSignalUsage) { | |
562 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
563 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
564 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
565 } | |
566 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
567 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
568 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
569 } | |
570 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
571 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
572 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
573 } | |
574 } | |
575 // Fill in signals that are blocked by all but the VM thread. | |
576 sigemptyset(&vm_sigs); | |
577 if (!ReduceSignalUsage) | |
578 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
579 debug_only(signal_sets_initialized = true); | |
580 | |
581 } | |
582 | |
583 // These are signals that are unblocked while a thread is running Java. | |
584 // (For some reason, they get blocked by default.) | |
585 sigset_t* os::Bsd::unblocked_signals() { | |
586 assert(signal_sets_initialized, "Not initialized"); | |
587 return &unblocked_sigs; | |
588 } | |
589 | |
590 // These are the signals that are blocked while a (non-VM) thread is | |
591 // running Java. Only the VM thread handles these signals. | |
592 sigset_t* os::Bsd::vm_signals() { | |
593 assert(signal_sets_initialized, "Not initialized"); | |
594 return &vm_sigs; | |
595 } | |
596 | |
597 // These are signals that are blocked during cond_wait to allow debugger in | |
598 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
599 assert(signal_sets_initialized, "Not initialized"); | |
600 return &allowdebug_blocked_sigs; | |
601 } | |
602 | |
603 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
604 | |
605 //Save caller's signal mask before setting VM signal mask | |
606 sigset_t caller_sigmask; | |
607 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
608 | |
609 OSThread* osthread = thread->osthread(); | |
610 osthread->set_caller_sigmask(caller_sigmask); | |
611 | |
612 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
613 | |
614 if (!ReduceSignalUsage) { | |
615 if (thread->is_VM_thread()) { | |
616 // Only the VM thread handles BREAK_SIGNAL ... | |
617 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
618 } else { | |
619 // ... all other threads block BREAK_SIGNAL | |
620 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
621 } | |
622 } | |
623 } | |
624 | |
625 | |
626 ////////////////////////////////////////////////////////////////////////////// | |
627 // create new thread | |
628 | |
629 // check if it's safe to start a new thread | |
630 static bool _thread_safety_check(Thread* thread) { | |
6918 | 631 return true; |
3960 | 632 } |
633 | |
4006 | 634 #ifdef __APPLE__ |
635 // library handle for calling objc_registerThreadWithCollector() | |
636 // without static linking to the libobjc library | |
637 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
638 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
639 typedef void (*objc_registerThreadWithCollector_t)(); | |
640 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
641 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
642 #endif | |
643 | |
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644 #ifdef __APPLE__ |
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645 static uint64_t locate_unique_thread_id() { |
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646 // Additional thread_id used to correlate threads in SA |
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647 thread_identifier_info_data_t m_ident_info; |
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648 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
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649 |
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650 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, |
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651 (thread_info_t) &m_ident_info, &count); |
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652 return m_ident_info.thread_id; |
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653 } |
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654 #endif |
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655 |
3960 | 656 // Thread start routine for all newly created threads |
657 static void *java_start(Thread *thread) { | |
658 // Try to randomize the cache line index of hot stack frames. | |
659 // This helps when threads of the same stack traces evict each other's | |
660 // cache lines. The threads can be either from the same JVM instance, or | |
661 // from different JVM instances. The benefit is especially true for | |
662 // processors with hyperthreading technology. | |
663 static int counter = 0; | |
664 int pid = os::current_process_id(); | |
665 alloca(((pid ^ counter++) & 7) * 128); | |
666 | |
667 ThreadLocalStorage::set_thread(thread); | |
668 | |
669 OSThread* osthread = thread->osthread(); | |
670 Monitor* sync = osthread->startThread_lock(); | |
671 | |
672 // non floating stack BsdThreads needs extra check, see above | |
673 if (!_thread_safety_check(thread)) { | |
674 // notify parent thread | |
675 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
676 osthread->set_state(ZOMBIE); | |
677 sync->notify_all(); | |
678 return NULL; | |
679 } | |
680 | |
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681 #ifdef __APPLE__ |
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682 // thread_id is mach thread on macos |
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683 osthread->set_thread_id(::mach_thread_self()); |
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684 osthread->set_unique_thread_id(locate_unique_thread_id()); |
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685 #else |
3960 | 686 // thread_id is pthread_id on BSD |
687 osthread->set_thread_id(::pthread_self()); | |
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688 #endif |
3960 | 689 // initialize signal mask for this thread |
690 os::Bsd::hotspot_sigmask(thread); | |
691 | |
692 // initialize floating point control register | |
693 os::Bsd::init_thread_fpu_state(); | |
694 | |
4006 | 695 #ifdef __APPLE__ |
696 // register thread with objc gc | |
697 if (objc_registerThreadWithCollectorFunction != NULL) { | |
698 objc_registerThreadWithCollectorFunction(); | |
699 } | |
700 #endif | |
701 | |
3960 | 702 // handshaking with parent thread |
703 { | |
704 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
705 | |
706 // notify parent thread | |
707 osthread->set_state(INITIALIZED); | |
708 sync->notify_all(); | |
709 | |
710 // wait until os::start_thread() | |
711 while (osthread->get_state() == INITIALIZED) { | |
712 sync->wait(Mutex::_no_safepoint_check_flag); | |
713 } | |
714 } | |
715 | |
716 // call one more level start routine | |
717 thread->run(); | |
718 | |
719 return 0; | |
720 } | |
721 | |
722 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
723 assert(thread->osthread() == NULL, "caller responsible"); | |
724 | |
725 // Allocate the OSThread object | |
726 OSThread* osthread = new OSThread(NULL, NULL); | |
727 if (osthread == NULL) { | |
728 return false; | |
729 } | |
730 | |
731 // set the correct thread state | |
732 osthread->set_thread_type(thr_type); | |
733 | |
734 // Initial state is ALLOCATED but not INITIALIZED | |
735 osthread->set_state(ALLOCATED); | |
736 | |
737 thread->set_osthread(osthread); | |
738 | |
739 // init thread attributes | |
740 pthread_attr_t attr; | |
741 pthread_attr_init(&attr); | |
742 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
743 | |
744 // stack size | |
745 if (os::Bsd::supports_variable_stack_size()) { | |
746 // calculate stack size if it's not specified by caller | |
747 if (stack_size == 0) { | |
748 stack_size = os::Bsd::default_stack_size(thr_type); | |
749 | |
750 switch (thr_type) { | |
751 case os::java_thread: | |
752 // Java threads use ThreadStackSize which default value can be | |
753 // changed with the flag -Xss | |
754 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
755 stack_size = JavaThread::stack_size_at_create(); | |
756 break; | |
757 case os::compiler_thread: | |
758 if (CompilerThreadStackSize > 0) { | |
759 stack_size = (size_t)(CompilerThreadStackSize * K); | |
760 break; | |
761 } // else fall through: | |
762 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
763 case os::vm_thread: | |
764 case os::pgc_thread: | |
765 case os::cgc_thread: | |
766 case os::watcher_thread: | |
767 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
768 break; | |
769 } | |
770 } | |
771 | |
772 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
773 pthread_attr_setstacksize(&attr, stack_size); | |
774 } else { | |
775 // let pthread_create() pick the default value. | |
776 } | |
777 | |
778 ThreadState state; | |
779 | |
780 { | |
781 pthread_t tid; | |
782 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
783 | |
784 pthread_attr_destroy(&attr); | |
785 | |
786 if (ret != 0) { | |
787 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
788 perror("pthread_create()"); | |
789 } | |
790 // Need to clean up stuff we've allocated so far | |
791 thread->set_osthread(NULL); | |
792 delete osthread; | |
793 return false; | |
794 } | |
795 | |
796 // Store pthread info into the OSThread | |
797 osthread->set_pthread_id(tid); | |
798 | |
799 // Wait until child thread is either initialized or aborted | |
800 { | |
801 Monitor* sync_with_child = osthread->startThread_lock(); | |
802 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
803 while ((state = osthread->get_state()) == ALLOCATED) { | |
804 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
805 } | |
806 } | |
807 | |
808 } | |
809 | |
810 // Aborted due to thread limit being reached | |
811 if (state == ZOMBIE) { | |
812 thread->set_osthread(NULL); | |
813 delete osthread; | |
814 return false; | |
815 } | |
816 | |
817 // The thread is returned suspended (in state INITIALIZED), | |
818 // and is started higher up in the call chain | |
819 assert(state == INITIALIZED, "race condition"); | |
820 return true; | |
821 } | |
822 | |
823 ///////////////////////////////////////////////////////////////////////////// | |
824 // attach existing thread | |
825 | |
826 // bootstrap the main thread | |
827 bool os::create_main_thread(JavaThread* thread) { | |
828 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
829 return create_attached_thread(thread); | |
830 } | |
831 | |
832 bool os::create_attached_thread(JavaThread* thread) { | |
833 #ifdef ASSERT | |
834 thread->verify_not_published(); | |
835 #endif | |
836 | |
837 // Allocate the OSThread object | |
838 OSThread* osthread = new OSThread(NULL, NULL); | |
839 | |
840 if (osthread == NULL) { | |
841 return false; | |
842 } | |
843 | |
844 // Store pthread info into the OSThread | |
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845 #ifdef __APPLE__ |
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846 osthread->set_thread_id(::mach_thread_self()); |
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847 osthread->set_unique_thread_id(locate_unique_thread_id()); |
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848 #else |
3960 | 849 osthread->set_thread_id(::pthread_self()); |
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850 #endif |
3960 | 851 osthread->set_pthread_id(::pthread_self()); |
852 | |
853 // initialize floating point control register | |
854 os::Bsd::init_thread_fpu_state(); | |
855 | |
856 // Initial thread state is RUNNABLE | |
857 osthread->set_state(RUNNABLE); | |
858 | |
859 thread->set_osthread(osthread); | |
860 | |
861 // initialize signal mask for this thread | |
862 // and save the caller's signal mask | |
863 os::Bsd::hotspot_sigmask(thread); | |
864 | |
865 return true; | |
866 } | |
867 | |
868 void os::pd_start_thread(Thread* thread) { | |
869 OSThread * osthread = thread->osthread(); | |
870 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
871 Monitor* sync_with_child = osthread->startThread_lock(); | |
872 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
873 sync_with_child->notify(); | |
874 } | |
875 | |
876 // Free Bsd resources related to the OSThread | |
877 void os::free_thread(OSThread* osthread) { | |
878 assert(osthread != NULL, "osthread not set"); | |
879 | |
880 if (Thread::current()->osthread() == osthread) { | |
881 // Restore caller's signal mask | |
882 sigset_t sigmask = osthread->caller_sigmask(); | |
883 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
884 } | |
885 | |
886 delete osthread; | |
887 } | |
888 | |
889 ////////////////////////////////////////////////////////////////////////////// | |
890 // thread local storage | |
891 | |
892 int os::allocate_thread_local_storage() { | |
893 pthread_key_t key; | |
894 int rslt = pthread_key_create(&key, NULL); | |
895 assert(rslt == 0, "cannot allocate thread local storage"); | |
896 return (int)key; | |
897 } | |
898 | |
899 // Note: This is currently not used by VM, as we don't destroy TLS key | |
900 // on VM exit. | |
901 void os::free_thread_local_storage(int index) { | |
902 int rslt = pthread_key_delete((pthread_key_t)index); | |
903 assert(rslt == 0, "invalid index"); | |
904 } | |
905 | |
906 void os::thread_local_storage_at_put(int index, void* value) { | |
907 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
908 assert(rslt == 0, "pthread_setspecific failed"); | |
909 } | |
910 | |
911 extern "C" Thread* get_thread() { | |
912 return ThreadLocalStorage::thread(); | |
913 } | |
914 | |
915 | |
916 //////////////////////////////////////////////////////////////////////////////// | |
917 // time support | |
918 | |
919 // Time since start-up in seconds to a fine granularity. | |
920 // Used by VMSelfDestructTimer and the MemProfiler. | |
921 double os::elapsedTime() { | |
922 | |
923 return (double)(os::elapsed_counter()) * 0.000001; | |
924 } | |
925 | |
926 jlong os::elapsed_counter() { | |
927 timeval time; | |
928 int status = gettimeofday(&time, NULL); | |
929 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
930 } | |
931 | |
932 jlong os::elapsed_frequency() { | |
933 return (1000 * 1000); | |
934 } | |
935 | |
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936 bool os::supports_vtime() { return true; } |
3960 | 937 bool os::enable_vtime() { return false; } |
938 bool os::vtime_enabled() { return false; } | |
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939 |
3960 | 940 double os::elapsedVTime() { |
941 // better than nothing, but not much | |
942 return elapsedTime(); | |
943 } | |
944 | |
945 jlong os::javaTimeMillis() { | |
946 timeval time; | |
947 int status = gettimeofday(&time, NULL); | |
948 assert(status != -1, "bsd error"); | |
949 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
950 } | |
951 | |
952 #ifndef CLOCK_MONOTONIC | |
953 #define CLOCK_MONOTONIC (1) | |
954 #endif | |
955 | |
956 #ifdef __APPLE__ | |
957 void os::Bsd::clock_init() { | |
958 // XXXDARWIN: Investigate replacement monotonic clock | |
959 } | |
6918 | 960 #else |
3960 | 961 void os::Bsd::clock_init() { |
962 struct timespec res; | |
963 struct timespec tp; | |
964 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
965 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
966 // yes, monotonic clock is supported | |
967 _clock_gettime = ::clock_gettime; | |
968 } | |
969 } | |
970 #endif | |
971 | |
972 | |
973 jlong os::javaTimeNanos() { | |
974 if (Bsd::supports_monotonic_clock()) { | |
975 struct timespec tp; | |
976 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
977 assert(status == 0, "gettime error"); | |
978 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
979 return result; | |
980 } else { | |
981 timeval time; | |
982 int status = gettimeofday(&time, NULL); | |
983 assert(status != -1, "bsd error"); | |
984 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
985 return 1000 * usecs; | |
986 } | |
987 } | |
988 | |
989 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
990 if (Bsd::supports_monotonic_clock()) { | |
991 info_ptr->max_value = ALL_64_BITS; | |
992 | |
993 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
994 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
995 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
996 } else { | |
997 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
998 info_ptr->max_value = ALL_64_BITS; | |
999 | |
1000 // gettimeofday is a real time clock so it skips | |
1001 info_ptr->may_skip_backward = true; | |
1002 info_ptr->may_skip_forward = true; | |
1003 } | |
1004 | |
1005 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1006 } | |
1007 | |
1008 // Return the real, user, and system times in seconds from an | |
1009 // arbitrary fixed point in the past. | |
1010 bool os::getTimesSecs(double* process_real_time, | |
1011 double* process_user_time, | |
1012 double* process_system_time) { | |
1013 struct tms ticks; | |
1014 clock_t real_ticks = times(&ticks); | |
1015 | |
1016 if (real_ticks == (clock_t) (-1)) { | |
1017 return false; | |
1018 } else { | |
1019 double ticks_per_second = (double) clock_tics_per_sec; | |
1020 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1021 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1022 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1023 | |
1024 return true; | |
1025 } | |
1026 } | |
1027 | |
1028 | |
1029 char * os::local_time_string(char *buf, size_t buflen) { | |
1030 struct tm t; | |
1031 time_t long_time; | |
1032 time(&long_time); | |
1033 localtime_r(&long_time, &t); | |
1034 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1035 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1036 t.tm_hour, t.tm_min, t.tm_sec); | |
1037 return buf; | |
1038 } | |
1039 | |
1040 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1041 return localtime_r(clock, res); | |
1042 } | |
1043 | |
1044 //////////////////////////////////////////////////////////////////////////////// | |
1045 // runtime exit support | |
1046 | |
1047 // Note: os::shutdown() might be called very early during initialization, or | |
1048 // called from signal handler. Before adding something to os::shutdown(), make | |
1049 // sure it is async-safe and can handle partially initialized VM. | |
1050 void os::shutdown() { | |
1051 | |
1052 // allow PerfMemory to attempt cleanup of any persistent resources | |
1053 perfMemory_exit(); | |
1054 | |
1055 // needs to remove object in file system | |
1056 AttachListener::abort(); | |
1057 | |
1058 // flush buffered output, finish log files | |
1059 ostream_abort(); | |
1060 | |
1061 // Check for abort hook | |
1062 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1063 if (abort_hook != NULL) { | |
1064 abort_hook(); | |
1065 } | |
1066 | |
1067 } | |
1068 | |
1069 // Note: os::abort() might be called very early during initialization, or | |
1070 // called from signal handler. Before adding something to os::abort(), make | |
1071 // sure it is async-safe and can handle partially initialized VM. | |
1072 void os::abort(bool dump_core) { | |
1073 os::shutdown(); | |
1074 if (dump_core) { | |
1075 #ifndef PRODUCT | |
1076 fdStream out(defaultStream::output_fd()); | |
1077 out.print_raw("Current thread is "); | |
1078 char buf[16]; | |
1079 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1080 out.print_raw_cr(buf); | |
1081 out.print_raw_cr("Dumping core ..."); | |
1082 #endif | |
1083 ::abort(); // dump core | |
1084 } | |
1085 | |
1086 ::exit(1); | |
1087 } | |
1088 | |
1089 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1090 void os::die() { | |
1091 // _exit() on BsdThreads only kills current thread | |
1092 ::abort(); | |
1093 } | |
1094 | |
1095 // unused on bsd for now. | |
1096 void os::set_error_file(const char *logfile) {} | |
1097 | |
1098 | |
1099 // This method is a copy of JDK's sysGetLastErrorString | |
1100 // from src/solaris/hpi/src/system_md.c | |
1101 | |
1102 size_t os::lasterror(char *buf, size_t len) { | |
1103 | |
1104 if (errno == 0) return 0; | |
1105 | |
1106 const char *s = ::strerror(errno); | |
1107 size_t n = ::strlen(s); | |
1108 if (n >= len) { | |
1109 n = len - 1; | |
1110 } | |
1111 ::strncpy(buf, s, n); | |
1112 buf[n] = '\0'; | |
1113 return n; | |
1114 } | |
1115 | |
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1116 intx os::current_thread_id() { |
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1117 #ifdef __APPLE__ |
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1118 return (intx)::mach_thread_self(); |
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1119 #else |
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1120 return (intx)::pthread_self(); |
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1121 #endif |
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1122 } |
3960 | 1123 int os::current_process_id() { |
1124 | |
1125 // Under the old bsd thread library, bsd gives each thread | |
1126 // its own process id. Because of this each thread will return | |
1127 // a different pid if this method were to return the result | |
1128 // of getpid(2). Bsd provides no api that returns the pid | |
1129 // of the launcher thread for the vm. This implementation | |
1130 // returns a unique pid, the pid of the launcher thread | |
1131 // that starts the vm 'process'. | |
1132 | |
1133 // Under the NPTL, getpid() returns the same pid as the | |
1134 // launcher thread rather than a unique pid per thread. | |
1135 // Use gettid() if you want the old pre NPTL behaviour. | |
1136 | |
1137 // if you are looking for the result of a call to getpid() that | |
1138 // returns a unique pid for the calling thread, then look at the | |
1139 // OSThread::thread_id() method in osThread_bsd.hpp file | |
1140 | |
1141 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1142 } | |
1143 | |
1144 // DLL functions | |
1145 | |
1146 #define JNI_LIB_PREFIX "lib" | |
1147 #ifdef __APPLE__ | |
1148 #define JNI_LIB_SUFFIX ".dylib" | |
1149 #else | |
1150 #define JNI_LIB_SUFFIX ".so" | |
1151 #endif | |
1152 | |
1153 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
1154 | |
1155 // This must be hard coded because it's the system's temporary | |
1156 // directory not the java application's temp directory, ala java.io.tmpdir. | |
4006 | 1157 #ifdef __APPLE__ |
1158 // macosx has a secure per-user temporary directory | |
1159 char temp_path_storage[PATH_MAX]; | |
1160 const char* os::get_temp_directory() { | |
1161 static char *temp_path = NULL; | |
1162 if (temp_path == NULL) { | |
1163 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
1164 if (pathSize == 0 || pathSize > PATH_MAX) { | |
1165 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
1166 } | |
1167 temp_path = temp_path_storage; | |
1168 } | |
1169 return temp_path; | |
1170 } | |
1171 #else /* __APPLE__ */ | |
3960 | 1172 const char* os::get_temp_directory() { return "/tmp"; } |
4006 | 1173 #endif /* __APPLE__ */ |
3960 | 1174 |
1175 static bool file_exists(const char* filename) { | |
1176 struct stat statbuf; | |
1177 if (filename == NULL || strlen(filename) == 0) { | |
1178 return false; | |
1179 } | |
1180 return os::stat(filename, &statbuf) == 0; | |
1181 } | |
1182 | |
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1183 bool os::dll_build_name(char* buffer, size_t buflen, |
3960 | 1184 const char* pname, const char* fname) { |
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1185 bool retval = false; |
3960 | 1186 // Copied from libhpi |
1187 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1188 | |
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1189 // Return error on buffer overflow. |
3960 | 1190 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1191 return retval; |
3960 | 1192 } |
1193 | |
1194 if (pnamelen == 0) { | |
1195 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1196 retval = true; |
3960 | 1197 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1198 int n; | |
1199 char** pelements = split_path(pname, &n); | |
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1200 if (pelements == NULL) { |
9062 | 1201 return false; |
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1202 } |
3960 | 1203 for (int i = 0 ; i < n ; i++) { |
1204 // Really shouldn't be NULL, but check can't hurt | |
1205 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1206 continue; // skip the empty path values | |
1207 } | |
1208 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
1209 pelements[i], fname); | |
1210 if (file_exists(buffer)) { | |
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1211 retval = true; |
3960 | 1212 break; |
1213 } | |
1214 } | |
1215 // release the storage | |
1216 for (int i = 0 ; i < n ; i++) { | |
1217 if (pelements[i] != NULL) { | |
6197 | 1218 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
3960 | 1219 } |
1220 } | |
1221 if (pelements != NULL) { | |
6197 | 1222 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
3960 | 1223 } |
1224 } else { | |
1225 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1226 retval = true; |
3960 | 1227 } |
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1228 return retval; |
3960 | 1229 } |
1230 | |
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1231 // check if addr is inside libjvm.so |
3960 | 1232 bool os::address_is_in_vm(address addr) { |
1233 static address libjvm_base_addr; | |
1234 Dl_info dlinfo; | |
1235 | |
1236 if (libjvm_base_addr == NULL) { | |
1237 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
1238 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
1239 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
1240 } | |
1241 | |
1242 if (dladdr((void *)addr, &dlinfo)) { | |
1243 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
1244 } | |
1245 | |
1246 return false; | |
1247 } | |
1248 | |
6258 | 1249 |
1250 #define MACH_MAXSYMLEN 256 | |
1251 | |
3960 | 1252 bool os::dll_address_to_function_name(address addr, char *buf, |
1253 int buflen, int *offset) { | |
1254 Dl_info dlinfo; | |
6258 | 1255 char localbuf[MACH_MAXSYMLEN]; |
1256 | |
1257 // dladdr will find names of dynamic functions only, but does | |
1258 // it set dli_fbase with mach_header address when it "fails" ? | |
3960 | 1259 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
1260 if (buf != NULL) { | |
1261 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
1262 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
1263 } | |
1264 } | |
1265 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
1266 return true; | |
1267 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
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1269 buf, buflen, offset, dlinfo.dli_fname)) { |
3960 | 1270 return true; |
1271 } | |
1272 } | |
1273 | |
6258 | 1274 // Handle non-dymanic manually: |
1275 if (dlinfo.dli_fbase != NULL && | |
1276 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
1277 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
1278 jio_snprintf(buf, buflen, "%s", localbuf); | |
1279 } | |
1280 return true; | |
1281 } | |
3960 | 1282 if (buf != NULL) buf[0] = '\0'; |
1283 if (offset != NULL) *offset = -1; | |
1284 return false; | |
1285 } | |
1286 | |
1287 // ported from solaris version | |
1288 bool os::dll_address_to_library_name(address addr, char* buf, | |
1289 int buflen, int* offset) { | |
1290 Dl_info dlinfo; | |
1291 | |
1292 if (dladdr((void*)addr, &dlinfo)){ | |
1293 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
1294 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
1295 return true; | |
1296 } else { | |
1297 if (buf) buf[0] = '\0'; | |
1298 if (offset) *offset = -1; | |
1299 return false; | |
1300 } | |
1301 } | |
6918 | 1302 |
1303 // Loads .dll/.so and | |
1304 // in case of error it checks if .dll/.so was built for the | |
1305 // same architecture as Hotspot is running on | |
3960 | 1306 |
1307 #ifdef __APPLE__ | |
1308 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1309 void * result= ::dlopen(filename, RTLD_LAZY); | |
1310 if (result != NULL) { | |
1311 // Successful loading | |
1312 return result; | |
1313 } | |
1314 | |
1315 // Read system error message into ebuf | |
1316 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1317 ebuf[ebuflen-1]='\0'; | |
1318 | |
1319 return NULL; | |
1320 } | |
1321 #else | |
1322 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1323 { | |
1324 void * result= ::dlopen(filename, RTLD_LAZY); | |
1325 if (result != NULL) { | |
1326 // Successful loading | |
1327 return result; | |
1328 } | |
1329 | |
1330 Elf32_Ehdr elf_head; | |
1331 | |
1332 // Read system error message into ebuf | |
1333 // It may or may not be overwritten below | |
1334 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1335 ebuf[ebuflen-1]='\0'; | |
1336 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1337 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1338 | |
1339 if (diag_msg_max_length==0) { | |
1340 // No more space in ebuf for additional diagnostics message | |
1341 return NULL; | |
1342 } | |
1343 | |
1344 | |
1345 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1346 | |
1347 if (file_descriptor < 0) { | |
1348 // Can't open library, report dlerror() message | |
1349 return NULL; | |
1350 } | |
1351 | |
1352 bool failed_to_read_elf_head= | |
1353 (sizeof(elf_head)!= | |
1354 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1355 | |
1356 ::close(file_descriptor); | |
1357 if (failed_to_read_elf_head) { | |
1358 // file i/o error - report dlerror() msg | |
1359 return NULL; | |
1360 } | |
1361 | |
1362 typedef struct { | |
1363 Elf32_Half code; // Actual value as defined in elf.h | |
1364 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1365 char elf_class; // 32 or 64 bit | |
1366 char endianess; // MSB or LSB | |
1367 char* name; // String representation | |
1368 } arch_t; | |
1369 | |
1370 #ifndef EM_486 | |
1371 #define EM_486 6 /* Intel 80486 */ | |
1372 #endif | |
1373 | |
1374 #ifndef EM_MIPS_RS3_LE | |
1375 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
1376 #endif | |
1377 | |
1378 #ifndef EM_PPC64 | |
1379 #define EM_PPC64 21 /* PowerPC64 */ | |
1380 #endif | |
1381 | |
1382 #ifndef EM_S390 | |
1383 #define EM_S390 22 /* IBM System/390 */ | |
1384 #endif | |
1385 | |
1386 #ifndef EM_IA_64 | |
1387 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
1388 #endif | |
1389 | |
1390 #ifndef EM_X86_64 | |
1391 #define EM_X86_64 62 /* AMD x86-64 */ | |
1392 #endif | |
1393 | |
1394 static const arch_t arch_array[]={ | |
1395 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1396 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1397 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1398 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1399 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1400 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1401 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1402 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1403 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
1404 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1405 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1406 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1407 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1408 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1409 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1410 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
1411 }; | |
1412 | |
1413 #if (defined IA32) | |
1414 static Elf32_Half running_arch_code=EM_386; | |
1415 #elif (defined AMD64) | |
1416 static Elf32_Half running_arch_code=EM_X86_64; | |
1417 #elif (defined IA64) | |
1418 static Elf32_Half running_arch_code=EM_IA_64; | |
1419 #elif (defined __sparc) && (defined _LP64) | |
1420 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1421 #elif (defined __sparc) && (!defined _LP64) | |
1422 static Elf32_Half running_arch_code=EM_SPARC; | |
1423 #elif (defined __powerpc64__) | |
1424 static Elf32_Half running_arch_code=EM_PPC64; | |
1425 #elif (defined __powerpc__) | |
1426 static Elf32_Half running_arch_code=EM_PPC; | |
1427 #elif (defined ARM) | |
1428 static Elf32_Half running_arch_code=EM_ARM; | |
1429 #elif (defined S390) | |
1430 static Elf32_Half running_arch_code=EM_S390; | |
1431 #elif (defined ALPHA) | |
1432 static Elf32_Half running_arch_code=EM_ALPHA; | |
1433 #elif (defined MIPSEL) | |
1434 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1435 #elif (defined PARISC) | |
1436 static Elf32_Half running_arch_code=EM_PARISC; | |
1437 #elif (defined MIPS) | |
1438 static Elf32_Half running_arch_code=EM_MIPS; | |
1439 #elif (defined M68K) | |
1440 static Elf32_Half running_arch_code=EM_68K; | |
1441 #else | |
1442 #error Method os::dll_load requires that one of following is defined:\ | |
1443 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
1444 #endif | |
1445 | |
1446 // Identify compatability class for VM's architecture and library's architecture | |
1447 // Obtain string descriptions for architectures | |
1448 | |
1449 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1450 int running_arch_index=-1; | |
1451 | |
1452 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1453 if (running_arch_code == arch_array[i].code) { | |
1454 running_arch_index = i; | |
1455 } | |
1456 if (lib_arch.code == arch_array[i].code) { | |
1457 lib_arch.compat_class = arch_array[i].compat_class; | |
1458 lib_arch.name = arch_array[i].name; | |
1459 } | |
1460 } | |
1461 | |
1462 assert(running_arch_index != -1, | |
1463 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1464 if (running_arch_index == -1) { | |
1465 // Even though running architecture detection failed | |
1466 // we may still continue with reporting dlerror() message | |
1467 return NULL; | |
1468 } | |
1469 | |
1470 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1471 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1472 return NULL; | |
1473 } | |
1474 | |
1475 #ifndef S390 | |
1476 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
1477 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1478 return NULL; | |
1479 } | |
1480 #endif // !S390 | |
1481 | |
1482 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1483 if ( lib_arch.name!=NULL ) { | |
1484 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1485 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1486 lib_arch.name, arch_array[running_arch_index].name); | |
1487 } else { | |
1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1489 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1490 lib_arch.code, | |
1491 arch_array[running_arch_index].name); | |
1492 } | |
1493 } | |
1494 | |
1495 return NULL; | |
1496 } | |
1497 #endif /* !__APPLE__ */ | |
1498 | |
1499 // XXX: Do we need a lock around this as per Linux? | |
1500 void* os::dll_lookup(void* handle, const char* name) { | |
1501 return dlsym(handle, name); | |
1502 } | |
1503 | |
1504 | |
1505 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
1506 int fd = ::open(filename, O_RDONLY); | |
1507 if (fd == -1) { | |
1508 return false; | |
1509 } | |
1510 | |
1511 char buf[32]; | |
1512 int bytes; | |
1513 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
1514 st->print_raw(buf, bytes); | |
1515 } | |
1516 | |
1517 ::close(fd); | |
1518 | |
1519 return true; | |
1520 } | |
1521 | |
1522 void os::print_dll_info(outputStream *st) { | |
1523 st->print_cr("Dynamic libraries:"); | |
1524 #ifdef RTLD_DI_LINKMAP | |
1525 Dl_info dli; | |
1526 void *handle; | |
1527 Link_map *map; | |
1528 Link_map *p; | |
1529 | |
1530 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
1531 st->print_cr("Error: Cannot print dynamic libraries."); | |
1532 return; | |
1533 } | |
1534 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
1535 if (handle == NULL) { | |
1536 st->print_cr("Error: Cannot print dynamic libraries."); | |
1537 return; | |
1538 } | |
1539 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
1540 if (map == NULL) { | |
1541 st->print_cr("Error: Cannot print dynamic libraries."); | |
1542 return; | |
1543 } | |
1544 | |
1545 while (map->l_prev != NULL) | |
1546 map = map->l_prev; | |
1547 | |
1548 while (map != NULL) { | |
1549 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
1550 map = map->l_next; | |
1551 } | |
1552 | |
1553 dlclose(handle); | |
1554 #elif defined(__APPLE__) | |
1555 uint32_t count; | |
1556 uint32_t i; | |
1557 | |
1558 count = _dyld_image_count(); | |
1559 for (i = 1; i < count; i++) { | |
1560 const char *name = _dyld_get_image_name(i); | |
1561 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
1562 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
1563 } | |
1564 #else | |
1565 st->print_cr("Error: Cannot print dynamic libraries."); | |
1566 #endif | |
1567 } | |
1568 | |
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1569 void os::print_os_info_brief(outputStream* st) { |
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1570 st->print("Bsd"); |
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1571 |
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1572 os::Posix::print_uname_info(st); |
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1573 } |
3960 | 1574 |
1575 void os::print_os_info(outputStream* st) { | |
1576 st->print("OS:"); | |
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1577 st->print("Bsd"); |
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1578 |
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1579 os::Posix::print_uname_info(st); |
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1580 |
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1581 os::Posix::print_rlimit_info(st); |
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1582 |
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1583 os::Posix::print_load_average(st); |
3960 | 1584 } |
1585 | |
1586 void os::pd_print_cpu_info(outputStream* st) { | |
1587 // Nothing to do for now. | |
1588 } | |
1589 | |
1590 void os::print_memory_info(outputStream* st) { | |
1591 | |
1592 st->print("Memory:"); | |
1593 st->print(" %dk page", os::vm_page_size()>>10); | |
1594 | |
1595 st->print(", physical " UINT64_FORMAT "k", | |
1596 os::physical_memory() >> 10); | |
1597 st->print("(" UINT64_FORMAT "k free)", | |
1598 os::available_memory() >> 10); | |
1599 st->cr(); | |
1600 | |
1601 // meminfo | |
1602 st->print("\n/proc/meminfo:\n"); | |
1603 _print_ascii_file("/proc/meminfo", st); | |
1604 st->cr(); | |
1605 } | |
1606 | |
1607 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
1608 // but they're the same for all the bsd arch that we support | |
1609 // and they're the same for solaris but there's no common place to put this. | |
1610 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
1611 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
1612 "ILL_COPROC", "ILL_BADSTK" }; | |
1613 | |
1614 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
1615 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
1616 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
1617 | |
1618 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
1619 | |
1620 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
1621 | |
1622 void os::print_siginfo(outputStream* st, void* siginfo) { | |
1623 st->print("siginfo:"); | |
1624 | |
1625 const int buflen = 100; | |
1626 char buf[buflen]; | |
1627 siginfo_t *si = (siginfo_t*)siginfo; | |
1628 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
1629 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
1630 st->print("si_errno=%s", buf); | |
1631 } else { | |
1632 st->print("si_errno=%d", si->si_errno); | |
1633 } | |
1634 const int c = si->si_code; | |
1635 assert(c > 0, "unexpected si_code"); | |
1636 switch (si->si_signo) { | |
1637 case SIGILL: | |
1638 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
1639 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1640 break; | |
1641 case SIGFPE: | |
1642 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
1643 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1644 break; | |
1645 case SIGSEGV: | |
1646 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
1647 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1648 break; | |
1649 case SIGBUS: | |
1650 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
1651 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1652 break; | |
1653 default: | |
1654 st->print(", si_code=%d", si->si_code); | |
1655 // no si_addr | |
1656 } | |
1657 | |
1658 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
1659 UseSharedSpaces) { | |
1660 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
1661 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
1662 st->print("\n\nError accessing class data sharing archive." \ | |
1663 " Mapped file inaccessible during execution, " \ | |
1664 " possible disk/network problem."); | |
1665 } | |
1666 } | |
1667 st->cr(); | |
1668 } | |
1669 | |
1670 | |
1671 static void print_signal_handler(outputStream* st, int sig, | |
1672 char* buf, size_t buflen); | |
1673 | |
1674 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1675 st->print_cr("Signal Handlers:"); | |
1676 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1677 print_signal_handler(st, SIGBUS , buf, buflen); | |
1678 print_signal_handler(st, SIGFPE , buf, buflen); | |
1679 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1680 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1681 print_signal_handler(st, SIGILL , buf, buflen); | |
1682 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1683 print_signal_handler(st, SR_signum, buf, buflen); | |
1684 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1685 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1686 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1687 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1688 } | |
1689 | |
1690 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1691 | |
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1692 // Find the full path to the current module, libjvm |
3960 | 1693 void os::jvm_path(char *buf, jint buflen) { |
1694 // Error checking. | |
1695 if (buflen < MAXPATHLEN) { | |
1696 assert(false, "must use a large-enough buffer"); | |
1697 buf[0] = '\0'; | |
1698 return; | |
1699 } | |
1700 // Lazy resolve the path to current module. | |
1701 if (saved_jvm_path[0] != 0) { | |
1702 strcpy(buf, saved_jvm_path); | |
1703 return; | |
1704 } | |
1705 | |
1706 char dli_fname[MAXPATHLEN]; | |
1707 bool ret = dll_address_to_library_name( | |
1708 CAST_FROM_FN_PTR(address, os::jvm_path), | |
1709 dli_fname, sizeof(dli_fname), NULL); | |
1710 assert(ret != 0, "cannot locate libjvm"); | |
1711 char *rp = realpath(dli_fname, buf); | |
1712 if (rp == NULL) | |
1713 return; | |
1714 | |
1715 if (Arguments::created_by_gamma_launcher()) { | |
1716 // Support for the gamma launcher. Typical value for buf is | |
4846 | 1717 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
3960 | 1718 // the right place in the string, then assume we are installed in a JDK and |
4846 | 1719 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
1720 // construct a path to the JVM being overridden. | |
1721 | |
3960 | 1722 const char *p = buf + strlen(buf) - 1; |
1723 for (int count = 0; p > buf && count < 5; ++count) { | |
1724 for (--p; p > buf && *p != '/'; --p) | |
1725 /* empty */ ; | |
1726 } | |
1727 | |
1728 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
1729 // Look for JAVA_HOME in the environment. | |
1730 char* java_home_var = ::getenv("JAVA_HOME"); | |
1731 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1732 char* jrelib_p; | |
1733 int len; | |
1734 | |
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1735 // Check the current module name "libjvm" |
3960 | 1736 p = strrchr(buf, '/'); |
1737 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
1738 | |
1739 rp = realpath(java_home_var, buf); | |
1740 if (rp == NULL) | |
1741 return; | |
1742 | |
1743 // determine if this is a legacy image or modules image | |
1744 // modules image doesn't have "jre" subdirectory | |
1745 len = strlen(buf); | |
1746 jrelib_p = buf + len; | |
4846 | 1747 |
1748 // Add the appropriate library subdir | |
1749 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
3960 | 1750 if (0 != access(buf, F_OK)) { |
4846 | 1751 snprintf(jrelib_p, buflen-len, "/lib"); |
3960 | 1752 } |
1753 | |
4846 | 1754 // Add the appropriate client or server subdir |
1755 len = strlen(buf); | |
1756 jrelib_p = buf + len; | |
1757 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
1758 if (0 != access(buf, F_OK)) { | |
1759 snprintf(jrelib_p, buflen-len, ""); | |
1760 } | |
1761 | |
1762 // If the path exists within JAVA_HOME, add the JVM library name | |
1763 // to complete the path to JVM being overridden. Otherwise fallback | |
1764 // to the path to the current library. | |
3960 | 1765 if (0 == access(buf, F_OK)) { |
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1766 // Use current module name "libjvm" |
3960 | 1767 len = strlen(buf); |
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1768 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
3960 | 1769 } else { |
4846 | 1770 // Fall back to path of current library |
3960 | 1771 rp = realpath(dli_fname, buf); |
1772 if (rp == NULL) | |
1773 return; | |
1774 } | |
1775 } | |
1776 } | |
1777 } | |
1778 | |
1779 strcpy(saved_jvm_path, buf); | |
1780 } | |
1781 | |
1782 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1783 // no prefix required, not even "_" | |
1784 } | |
1785 | |
1786 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1787 // no suffix required | |
1788 } | |
1789 | |
1790 //////////////////////////////////////////////////////////////////////////////// | |
1791 // sun.misc.Signal support | |
1792 | |
1793 static volatile jint sigint_count = 0; | |
1794 | |
1795 static void | |
1796 UserHandler(int sig, void *siginfo, void *context) { | |
1797 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1798 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1799 // don't want to flood the manager thread with sem_post requests. | |
1800 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1801 return; | |
1802 | |
1803 // Ctrl-C is pressed during error reporting, likely because the error | |
1804 // handler fails to abort. Let VM die immediately. | |
1805 if (sig == SIGINT && is_error_reported()) { | |
1806 os::die(); | |
1807 } | |
1808 | |
1809 os::signal_notify(sig); | |
1810 } | |
1811 | |
1812 void* os::user_handler() { | |
1813 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1814 } | |
1815 | |
1816 extern "C" { | |
1817 typedef void (*sa_handler_t)(int); | |
1818 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1819 } | |
1820 | |
1821 void* os::signal(int signal_number, void* handler) { | |
1822 struct sigaction sigAct, oldSigAct; | |
1823 | |
1824 sigfillset(&(sigAct.sa_mask)); | |
1825 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1826 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1827 | |
1828 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1829 // -1 means registration failed | |
1830 return (void *)-1; | |
1831 } | |
1832 | |
1833 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1834 } | |
1835 | |
1836 void os::signal_raise(int signal_number) { | |
1837 ::raise(signal_number); | |
1838 } | |
1839 | |
1840 /* | |
1841 * The following code is moved from os.cpp for making this | |
1842 * code platform specific, which it is by its very nature. | |
1843 */ | |
1844 | |
1845 // Will be modified when max signal is changed to be dynamic | |
1846 int os::sigexitnum_pd() { | |
1847 return NSIG; | |
1848 } | |
1849 | |
1850 // a counter for each possible signal value | |
1851 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1852 | |
1853 // Bsd(POSIX) specific hand shaking semaphore. | |
1854 #ifdef __APPLE__ | |
10405 | 1855 typedef semaphore_t os_semaphore_t; |
3960 | 1856 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
10405 | 1857 #define SEM_WAIT(sem) semaphore_wait(sem) |
1858 #define SEM_POST(sem) semaphore_signal(sem) | |
1859 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) | |
3960 | 1860 #else |
10405 | 1861 typedef sem_t os_semaphore_t; |
3960 | 1862 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
10405 | 1863 #define SEM_WAIT(sem) sem_wait(&sem) |
1864 #define SEM_POST(sem) sem_post(&sem) | |
1865 #define SEM_DESTROY(sem) sem_destroy(&sem) | |
3960 | 1866 #endif |
1867 | |
10405 | 1868 class Semaphore : public StackObj { |
1869 public: | |
1870 Semaphore(); | |
1871 ~Semaphore(); | |
1872 void signal(); | |
1873 void wait(); | |
1874 bool trywait(); | |
1875 bool timedwait(unsigned int sec, int nsec); | |
1876 private: | |
1877 jlong currenttime() const; | |
1878 semaphore_t _semaphore; | |
1879 }; | |
1880 | |
1881 Semaphore::Semaphore() : _semaphore(0) { | |
1882 SEM_INIT(_semaphore, 0); | |
1883 } | |
1884 | |
1885 Semaphore::~Semaphore() { | |
1886 SEM_DESTROY(_semaphore); | |
1887 } | |
1888 | |
1889 void Semaphore::signal() { | |
1890 SEM_POST(_semaphore); | |
1891 } | |
1892 | |
1893 void Semaphore::wait() { | |
1894 SEM_WAIT(_semaphore); | |
1895 } | |
1896 | |
1897 jlong Semaphore::currenttime() const { | |
1898 struct timeval tv; | |
1899 gettimeofday(&tv, NULL); | |
1900 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); | |
1901 } | |
1902 | |
1903 #ifdef __APPLE__ | |
1904 bool Semaphore::trywait() { | |
1905 return timedwait(0, 0); | |
1906 } | |
1907 | |
1908 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
1909 kern_return_t kr = KERN_ABORTED; | |
1910 mach_timespec_t waitspec; | |
1911 waitspec.tv_sec = sec; | |
1912 waitspec.tv_nsec = nsec; | |
1913 | |
1914 jlong starttime = currenttime(); | |
1915 | |
1916 kr = semaphore_timedwait(_semaphore, waitspec); | |
1917 while (kr == KERN_ABORTED) { | |
1918 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; | |
1919 | |
1920 jlong current = currenttime(); | |
1921 jlong passedtime = current - starttime; | |
1922 | |
1923 if (passedtime >= totalwait) { | |
1924 waitspec.tv_sec = 0; | |
1925 waitspec.tv_nsec = 0; | |
1926 } else { | |
1927 jlong waittime = totalwait - (current - starttime); | |
1928 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; | |
1929 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; | |
1930 } | |
1931 | |
1932 kr = semaphore_timedwait(_semaphore, waitspec); | |
1933 } | |
1934 | |
1935 return kr == KERN_SUCCESS; | |
1936 } | |
1937 | |
1938 #else | |
1939 | |
1940 bool Semaphore::trywait() { | |
1941 return sem_trywait(&_semaphore) == 0; | |
1942 } | |
1943 | |
1944 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
1945 struct timespec ts; | |
1946 jlong endtime = unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); | |
1947 | |
1948 while (1) { | |
1949 int result = sem_timedwait(&_semaphore, &ts); | |
1950 if (result == 0) { | |
1951 return true; | |
1952 } else if (errno == EINTR) { | |
1953 continue; | |
1954 } else if (errno == ETIMEDOUT) { | |
1955 return false; | |
1956 } else { | |
1957 return false; | |
1958 } | |
1959 } | |
1960 } | |
1961 | |
1962 #endif // __APPLE__ | |
1963 | |
1964 static os_semaphore_t sig_sem; | |
1965 static Semaphore sr_semaphore; | |
1966 | |
3960 | 1967 void os::signal_init_pd() { |
1968 // Initialize signal structures | |
1969 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
1970 | |
1971 // Initialize signal semaphore | |
1972 ::SEM_INIT(sig_sem, 0); | |
1973 } | |
1974 | |
1975 void os::signal_notify(int sig) { | |
1976 Atomic::inc(&pending_signals[sig]); | |
1977 ::SEM_POST(sig_sem); | |
1978 } | |
1979 | |
1980 static int check_pending_signals(bool wait) { | |
1981 Atomic::store(0, &sigint_count); | |
1982 for (;;) { | |
1983 for (int i = 0; i < NSIG + 1; i++) { | |
1984 jint n = pending_signals[i]; | |
1985 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
1986 return i; | |
1987 } | |
1988 } | |
1989 if (!wait) { | |
1990 return -1; | |
1991 } | |
1992 JavaThread *thread = JavaThread::current(); | |
1993 ThreadBlockInVM tbivm(thread); | |
1994 | |
1995 bool threadIsSuspended; | |
1996 do { | |
1997 thread->set_suspend_equivalent(); | |
1998 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
1999 ::SEM_WAIT(sig_sem); | |
2000 | |
2001 // were we externally suspended while we were waiting? | |
2002 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2003 if (threadIsSuspended) { | |
2004 // | |
2005 // The semaphore has been incremented, but while we were waiting | |
2006 // another thread suspended us. We don't want to continue running | |
2007 // while suspended because that would surprise the thread that | |
2008 // suspended us. | |
2009 // | |
2010 ::SEM_POST(sig_sem); | |
2011 | |
2012 thread->java_suspend_self(); | |
2013 } | |
2014 } while (threadIsSuspended); | |
2015 } | |
2016 } | |
2017 | |
2018 int os::signal_lookup() { | |
2019 return check_pending_signals(false); | |
2020 } | |
2021 | |
2022 int os::signal_wait() { | |
2023 return check_pending_signals(true); | |
2024 } | |
2025 | |
2026 //////////////////////////////////////////////////////////////////////////////// | |
2027 // Virtual Memory | |
2028 | |
2029 int os::vm_page_size() { | |
2030 // Seems redundant as all get out | |
2031 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2032 return os::Bsd::page_size(); | |
2033 } | |
2034 | |
2035 // Solaris allocates memory by pages. | |
2036 int os::vm_allocation_granularity() { | |
2037 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2038 return os::Bsd::page_size(); | |
2039 } | |
2040 | |
2041 // Rationale behind this function: | |
2042 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2043 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2044 // samples for JITted code. Here we create private executable mapping over the code cache | |
2045 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2046 // info for the reporting script by storing timestamp and location of symbol | |
2047 void bsd_wrap_code(char* base, size_t size) { | |
2048 static volatile jint cnt = 0; | |
2049 | |
2050 if (!UseOprofile) { | |
2051 return; | |
2052 } | |
2053 | |
2054 char buf[PATH_MAX + 1]; | |
2055 int num = Atomic::add(1, &cnt); | |
2056 | |
2057 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
2058 os::get_temp_directory(), os::current_process_id(), num); | |
2059 unlink(buf); | |
2060 | |
2061 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
2062 | |
2063 if (fd != -1) { | |
2064 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
2065 if (rv != (off_t)-1) { | |
2066 if (::write(fd, "", 1) == 1) { | |
2067 mmap(base, size, | |
2068 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2069 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2070 } | |
2071 } | |
2072 ::close(fd); | |
2073 unlink(buf); | |
2074 } | |
2075 } | |
2076 | |
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2077 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
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2078 int err) { |
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2079 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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2080 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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2081 strerror(err), err); |
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2082 } |
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2083 |
3960 | 2084 // NOTE: Bsd kernel does not really reserve the pages for us. |
2085 // All it does is to check if there are enough free pages | |
2086 // left at the time of mmap(). This could be a potential | |
2087 // problem. | |
6197 | 2088 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
3960 | 2089 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2090 #ifdef __OpenBSD__ | |
2091 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
10969
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2092 if (::mprotect(addr, size, prot) == 0) { |
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2093 return true; |
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2094 } |
3960 | 2095 #else |
2096 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
2097 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
10969
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2098 if (res != (uintptr_t) MAP_FAILED) { |
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2099 return true; |
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2100 } |
3960 | 2101 #endif |
10969
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2102 |
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2103 // Warn about any commit errors we see in non-product builds just |
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2104 // in case mmap() doesn't work as described on the man page. |
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2105 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) |
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2106 |
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2107 return false; |
3960 | 2108 } |
2109 | |
6197 | 2110 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
3960 | 2111 bool exec) { |
10969
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2112 // alignment_hint is ignored on this OS |
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2113 return pd_commit_memory(addr, size, exec); |
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2114 } |
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2115 |
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2116 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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2117 const char* mesg) { |
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2118 assert(mesg != NULL, "mesg must be specified"); |
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2119 if (!pd_commit_memory(addr, size, exec)) { |
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2120 // add extra info in product mode for vm_exit_out_of_memory(): |
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2121 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) |
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2122 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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2123 } |
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2124 } |
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2125 |
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2126 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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2127 size_t alignment_hint, bool exec, |
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2128 const char* mesg) { |
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2129 // alignment_hint is ignored on this OS |
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2130 pd_commit_memory_or_exit(addr, size, exec, mesg); |
3960 | 2131 } |
2132 | |
6197 | 2133 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2134 } |
2135 | |
6197 | 2136 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2137 ::madvise(addr, bytes, MADV_DONTNEED); |
2138 } | |
2139 | |
2140 void os::numa_make_global(char *addr, size_t bytes) { | |
2141 } | |
2142 | |
2143 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2144 } | |
2145 | |
2146 bool os::numa_topology_changed() { return false; } | |
2147 | |
2148 size_t os::numa_get_groups_num() { | |
2149 return 1; | |
2150 } | |
2151 | |
2152 int os::numa_get_group_id() { | |
2153 return 0; | |
2154 } | |
2155 | |
2156 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2157 if (size > 0) { | |
2158 ids[0] = 0; | |
2159 return 1; | |
2160 } | |
2161 return 0; | |
2162 } | |
2163 | |
2164 bool os::get_page_info(char *start, page_info* info) { | |
2165 return false; | |
2166 } | |
2167 | |
2168 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2169 return end; | |
2170 } | |
2171 | |
2172 | |
6197 | 2173 bool os::pd_uncommit_memory(char* addr, size_t size) { |
3960 | 2174 #ifdef __OpenBSD__ |
2175 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
2176 return ::mprotect(addr, size, PROT_NONE) == 0; | |
2177 #else | |
2178 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
2179 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
2180 return res != (uintptr_t) MAP_FAILED; | |
2181 #endif | |
2182 } | |
2183 | |
6197 | 2184 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
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2185 return os::commit_memory(addr, size, !ExecMem); |
3960 | 2186 } |
2187 | |
2188 // If this is a growable mapping, remove the guard pages entirely by | |
2189 // munmap()ping them. If not, just call uncommit_memory(). | |
2190 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2191 return os::uncommit_memory(addr, size); | |
2192 } | |
2193 | |
2194 static address _highest_vm_reserved_address = NULL; | |
2195 | |
2196 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2197 // at 'requested_addr'. If there are existing memory mappings at the same | |
2198 // location, however, they will be overwritten. If 'fixed' is false, | |
2199 // 'requested_addr' is only treated as a hint, the return value may or | |
2200 // may not start from the requested address. Unlike Bsd mmap(), this | |
2201 // function returns NULL to indicate failure. | |
2202 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2203 char * addr; | |
2204 int flags; | |
2205 | |
2206 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2207 if (fixed) { | |
2208 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
2209 flags |= MAP_FIXED; | |
2210 } | |
2211 | |
10157 | 2212 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
2213 // touch an uncommitted page. Otherwise, the read/write might | |
2214 // succeed if we have enough swap space to back the physical page. | |
2215 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
3960 | 2216 flags, -1, 0); |
2217 | |
2218 if (addr != MAP_FAILED) { | |
2219 // anon_mmap() should only get called during VM initialization, | |
2220 // don't need lock (actually we can skip locking even it can be called | |
2221 // from multiple threads, because _highest_vm_reserved_address is just a | |
2222 // hint about the upper limit of non-stack memory regions.) | |
2223 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2224 _highest_vm_reserved_address = (address)addr + bytes; | |
2225 } | |
2226 } | |
2227 | |
2228 return addr == MAP_FAILED ? NULL : addr; | |
2229 } | |
2230 | |
2231 // Don't update _highest_vm_reserved_address, because there might be memory | |
2232 // regions above addr + size. If so, releasing a memory region only creates | |
2233 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2234 // | |
2235 static int anon_munmap(char * addr, size_t size) { | |
2236 return ::munmap(addr, size) == 0; | |
2237 } | |
2238 | |
6197 | 2239 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
3960 | 2240 size_t alignment_hint) { |
2241 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2242 } | |
2243 | |
6197 | 2244 bool os::pd_release_memory(char* addr, size_t size) { |
3960 | 2245 return anon_munmap(addr, size); |
2246 } | |
2247 | |
2248 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
2249 // Bsd wants the mprotect address argument to be page aligned. | |
2250 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
2251 | |
2252 // According to SUSv3, mprotect() should only be used with mappings | |
2253 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2254 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2255 // protection of malloc'ed or statically allocated memory). Check the | |
2256 // caller if you hit this assert. | |
2257 assert(addr == bottom, "sanity check"); | |
2258 | |
2259 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
2260 return ::mprotect(bottom, size, prot) == 0; | |
2261 } | |
2262 | |
2263 // Set protections specified | |
2264 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
2265 bool is_committed) { | |
2266 unsigned int p = 0; | |
2267 switch (prot) { | |
2268 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2269 case MEM_PROT_READ: p = PROT_READ; break; | |
2270 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2271 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2272 default: | |
2273 ShouldNotReachHere(); | |
2274 } | |
2275 // is_committed is unused. | |
2276 return bsd_mprotect(addr, bytes, p); | |
2277 } | |
2278 | |
2279 bool os::guard_memory(char* addr, size_t size) { | |
2280 return bsd_mprotect(addr, size, PROT_NONE); | |
2281 } | |
2282 | |
2283 bool os::unguard_memory(char* addr, size_t size) { | |
2284 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
2285 } | |
2286 | |
2287 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
6918 | 2288 return false; |
3960 | 2289 } |
2290 | |
2291 // Large page support | |
2292 | |
2293 static size_t _large_page_size = 0; | |
2294 | |
2295 void os::large_page_init() { | |
2296 } | |
2297 | |
2298 | |
2299 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
2300 // "exec" is passed in but not used. Creating the shared image for | |
2301 // the code cache doesn't have an SHM_X executable permission to check. | |
2302 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
2303 | |
2304 key_t key = IPC_PRIVATE; | |
2305 char *addr; | |
2306 | |
2307 bool warn_on_failure = UseLargePages && | |
2308 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2309 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2310 ); | |
2311 char msg[128]; | |
2312 | |
2313 // Create a large shared memory region to attach to based on size. | |
2314 // Currently, size is the total size of the heap | |
2315 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
2316 if (shmid == -1) { | |
2317 // Possible reasons for shmget failure: | |
2318 // 1. shmmax is too small for Java heap. | |
2319 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2320 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2321 // 2. not enough large page memory. | |
2322 // > check available large pages: cat /proc/meminfo | |
2323 // > increase amount of large pages: | |
2324 // echo new_value > /proc/sys/vm/nr_hugepages | |
2325 // Note 1: different Bsd may use different name for this property, | |
2326 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2327 // Note 2: it's possible there's enough physical memory available but | |
2328 // they are so fragmented after a long run that they can't | |
2329 // coalesce into large pages. Try to reserve large pages when | |
2330 // the system is still "fresh". | |
2331 if (warn_on_failure) { | |
2332 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2333 warning(msg); | |
2334 } | |
2335 return NULL; | |
2336 } | |
2337 | |
2338 // attach to the region | |
2339 addr = (char*)shmat(shmid, req_addr, 0); | |
2340 int err = errno; | |
2341 | |
2342 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2343 // will be deleted when it's detached by shmdt() or when the process | |
2344 // terminates. If shmat() is not successful this will remove the shared | |
2345 // segment immediately. | |
2346 shmctl(shmid, IPC_RMID, NULL); | |
2347 | |
2348 if ((intptr_t)addr == -1) { | |
2349 if (warn_on_failure) { | |
2350 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2351 warning(msg); | |
2352 } | |
2353 return NULL; | |
2354 } | |
2355 | |
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2356 // The memory is committed |
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2357 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
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2358 |
3960 | 2359 return addr; |
2360 } | |
2361 | |
2362 bool os::release_memory_special(char* base, size_t bytes) { | |
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2363 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
3960 | 2364 // detaching the SHM segment will also delete it, see reserve_memory_special() |
2365 int rslt = shmdt(base); | |
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2366 if (rslt == 0) { |
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2367 tkr.record((address)base, bytes); |
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2368 return true; |
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2369 } else { |
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2370 tkr.discard(); |
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2371 return false; |
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2372 } |
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2373 |
3960 | 2374 } |
2375 | |
2376 size_t os::large_page_size() { | |
2377 return _large_page_size; | |
2378 } | |
2379 | |
2380 // HugeTLBFS allows application to commit large page memory on demand; | |
2381 // with SysV SHM the entire memory region must be allocated as shared | |
2382 // memory. | |
2383 bool os::can_commit_large_page_memory() { | |
2384 return UseHugeTLBFS; | |
2385 } | |
2386 | |
2387 bool os::can_execute_large_page_memory() { | |
2388 return UseHugeTLBFS; | |
2389 } | |
2390 | |
2391 // Reserve memory at an arbitrary address, only if that area is | |
2392 // available (and not reserved for something else). | |
2393 | |
6197 | 2394 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
3960 | 2395 const int max_tries = 10; |
2396 char* base[max_tries]; | |
2397 size_t size[max_tries]; | |
2398 const size_t gap = 0x000000; | |
2399 | |
2400 // Assert only that the size is a multiple of the page size, since | |
2401 // that's all that mmap requires, and since that's all we really know | |
2402 // about at this low abstraction level. If we need higher alignment, | |
2403 // we can either pass an alignment to this method or verify alignment | |
2404 // in one of the methods further up the call chain. See bug 5044738. | |
2405 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
2406 | |
2407 // Repeatedly allocate blocks until the block is allocated at the | |
2408 // right spot. Give up after max_tries. Note that reserve_memory() will | |
2409 // automatically update _highest_vm_reserved_address if the call is | |
2410 // successful. The variable tracks the highest memory address every reserved | |
2411 // by JVM. It is used to detect heap-stack collision if running with | |
2412 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
2413 // space than needed, it could confuse the collision detecting code. To | |
2414 // solve the problem, save current _highest_vm_reserved_address and | |
2415 // calculate the correct value before return. | |
2416 address old_highest = _highest_vm_reserved_address; | |
2417 | |
2418 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
2419 // if kernel honors the hint then we can return immediately. | |
2420 char * addr = anon_mmap(requested_addr, bytes, false); | |
2421 if (addr == requested_addr) { | |
2422 return requested_addr; | |
2423 } | |
2424 | |
2425 if (addr != NULL) { | |
2426 // mmap() is successful but it fails to reserve at the requested address | |
2427 anon_munmap(addr, bytes); | |
2428 } | |
2429 | |
2430 int i; | |
2431 for (i = 0; i < max_tries; ++i) { | |
2432 base[i] = reserve_memory(bytes); | |
2433 | |
2434 if (base[i] != NULL) { | |
2435 // Is this the block we wanted? | |
2436 if (base[i] == requested_addr) { | |
2437 size[i] = bytes; | |
2438 break; | |
2439 } | |
2440 | |
2441 // Does this overlap the block we wanted? Give back the overlapped | |
2442 // parts and try again. | |
2443 | |
2444 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
2445 if (top_overlap >= 0 && top_overlap < bytes) { | |
2446 unmap_memory(base[i], top_overlap); | |
2447 base[i] += top_overlap; | |
2448 size[i] = bytes - top_overlap; | |
2449 } else { | |
2450 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
2451 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
2452 unmap_memory(requested_addr, bottom_overlap); | |
2453 size[i] = bytes - bottom_overlap; | |
2454 } else { | |
2455 size[i] = bytes; | |
2456 } | |
2457 } | |
2458 } | |
2459 } | |
2460 | |
2461 // Give back the unused reserved pieces. | |
2462 | |
2463 for (int j = 0; j < i; ++j) { | |
2464 if (base[j] != NULL) { | |
2465 unmap_memory(base[j], size[j]); | |
2466 } | |
2467 } | |
2468 | |
2469 if (i < max_tries) { | |
2470 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
2471 return requested_addr; | |
2472 } else { | |
2473 _highest_vm_reserved_address = old_highest; | |
2474 return NULL; | |
2475 } | |
2476 } | |
2477 | |
2478 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2479 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
2480 } | |
2481 | |
2482 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
2483 // Solaris uses poll(), bsd uses park(). | |
2484 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
2485 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
2486 // SIGSEGV, see 4355769. | |
2487 | |
2488 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2489 assert(thread == Thread::current(), "thread consistency check"); | |
2490 | |
2491 ParkEvent * const slp = thread->_SleepEvent ; | |
2492 slp->reset() ; | |
2493 OrderAccess::fence() ; | |
2494 | |
2495 if (interruptible) { | |
2496 jlong prevtime = javaTimeNanos(); | |
2497 | |
2498 for (;;) { | |
2499 if (os::is_interrupted(thread, true)) { | |
2500 return OS_INTRPT; | |
2501 } | |
2502 | |
2503 jlong newtime = javaTimeNanos(); | |
2504 | |
2505 if (newtime - prevtime < 0) { | |
2506 // time moving backwards, should only happen if no monotonic clock | |
2507 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2508 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2509 } else { | |
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2510 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2511 } |
2512 | |
2513 if(millis <= 0) { | |
2514 return OS_OK; | |
2515 } | |
2516 | |
2517 prevtime = newtime; | |
2518 | |
2519 { | |
2520 assert(thread->is_Java_thread(), "sanity check"); | |
2521 JavaThread *jt = (JavaThread *) thread; | |
2522 ThreadBlockInVM tbivm(jt); | |
2523 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2524 | |
2525 jt->set_suspend_equivalent(); | |
2526 // cleared by handle_special_suspend_equivalent_condition() or | |
2527 // java_suspend_self() via check_and_wait_while_suspended() | |
2528 | |
2529 slp->park(millis); | |
2530 | |
2531 // were we externally suspended while we were waiting? | |
2532 jt->check_and_wait_while_suspended(); | |
2533 } | |
2534 } | |
2535 } else { | |
2536 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2537 jlong prevtime = javaTimeNanos(); | |
2538 | |
2539 for (;;) { | |
2540 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2541 // the 1st iteration ... | |
2542 jlong newtime = javaTimeNanos(); | |
2543 | |
2544 if (newtime - prevtime < 0) { | |
2545 // time moving backwards, should only happen if no monotonic clock | |
2546 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2547 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2548 } else { | |
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2549 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2550 } |
2551 | |
2552 if(millis <= 0) break ; | |
2553 | |
2554 prevtime = newtime; | |
2555 slp->park(millis); | |
2556 } | |
2557 return OS_OK ; | |
2558 } | |
2559 } | |
2560 | |
2561 int os::naked_sleep() { | |
2562 // %% make the sleep time an integer flag. for now use 1 millisec. | |
2563 return os::sleep(Thread::current(), 1, false); | |
2564 } | |
2565 | |
2566 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2567 void os::infinite_sleep() { | |
2568 while (true) { // sleep forever ... | |
2569 ::sleep(100); // ... 100 seconds at a time | |
2570 } | |
2571 } | |
2572 | |
2573 // Used to convert frequent JVM_Yield() to nops | |
2574 bool os::dont_yield() { | |
2575 return DontYieldALot; | |
2576 } | |
2577 | |
2578 void os::yield() { | |
2579 sched_yield(); | |
2580 } | |
2581 | |
2582 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
2583 | |
2584 void os::yield_all(int attempts) { | |
2585 // Yields to all threads, including threads with lower priorities | |
2586 // Threads on Bsd are all with same priority. The Solaris style | |
2587 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2588 sched_yield(); | |
2589 } | |
2590 | |
2591 // Called from the tight loops to possibly influence time-sharing heuristics | |
2592 void os::loop_breaker(int attempts) { | |
2593 os::yield_all(attempts); | |
2594 } | |
2595 | |
2596 //////////////////////////////////////////////////////////////////////////////// | |
2597 // thread priority support | |
2598 | |
2599 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
2600 // only supports dynamic priority, static priority must be zero. For real-time | |
2601 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
2602 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
2603 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
2604 // of 5 runs - Sep 2005). | |
2605 // | |
2606 // The following code actually changes the niceness of kernel-thread/LWP. It | |
2607 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
2608 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
2609 // threads. It has always been the case, but could change in the future. For | |
2610 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
2611 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
2612 | |
6918 | 2613 #if !defined(__APPLE__) |
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2614 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2615 19, // 0 Entry should never be used |
2616 | |
2617 0, // 1 MinPriority | |
2618 3, // 2 | |
2619 6, // 3 | |
2620 | |
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2621 10, // 4 |
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2622 15, // 5 NormPriority |
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2623 18, // 6 |
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2624 |
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2625 21, // 7 |
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2626 25, // 8 |
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2627 28, // 9 NearMaxPriority |
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2628 |
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2629 31, // 10 MaxPriority |
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2630 |
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2631 31 // 11 CriticalPriority |
3960 | 2632 }; |
6918 | 2633 #else |
3960 | 2634 /* Using Mach high-level priority assignments */ |
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2635 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2636 0, // 0 Entry should never be used (MINPRI_USER) |
2637 | |
2638 27, // 1 MinPriority | |
2639 28, // 2 | |
2640 29, // 3 | |
2641 | |
2642 30, // 4 | |
2643 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
2644 32, // 6 | |
2645 | |
2646 33, // 7 | |
2647 34, // 8 | |
2648 35, // 9 NearMaxPriority | |
2649 | |
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2650 36, // 10 MaxPriority |
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2651 |
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2652 36 // 11 CriticalPriority |
3960 | 2653 }; |
2654 #endif | |
2655 | |
2656 static int prio_init() { | |
2657 if (ThreadPriorityPolicy == 1) { | |
2658 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
2659 // if effective uid is not root. Perhaps, a more elegant way of doing | |
2660 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
2661 if (geteuid() != 0) { | |
2662 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
2663 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
2664 } | |
2665 ThreadPriorityPolicy = 0; | |
2666 } | |
2667 } | |
4854
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2668 if (UseCriticalJavaThreadPriority) { |
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|
2669 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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|
2670 } |
3960 | 2671 return 0; |
2672 } | |
2673 | |
2674 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2675 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
2676 | |
2677 #ifdef __OpenBSD__ | |
2678 // OpenBSD pthread_setprio starves low priority threads | |
2679 return OS_OK; | |
2680 #elif defined(__FreeBSD__) | |
2681 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
2682 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2683 struct sched_param sp; | |
2684 int policy; | |
2685 pthread_t self = pthread_self(); | |
2686 | |
2687 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
2688 return OS_ERR; | |
2689 | |
2690 sp.sched_priority = newpri; | |
2691 if (pthread_setschedparam(self, policy, &sp) != 0) | |
2692 return OS_ERR; | |
2693 | |
2694 return OS_OK; | |
2695 #else | |
2696 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
2697 return (ret == 0) ? OS_OK : OS_ERR; | |
2698 #endif | |
2699 } | |
2700 | |
2701 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2702 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
2703 *priority_ptr = java_to_os_priority[NormPriority]; | |
2704 return OS_OK; | |
2705 } | |
2706 | |
2707 errno = 0; | |
2708 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
2709 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
2710 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2711 int policy; | |
2712 struct sched_param sp; | |
2713 | |
2714 pthread_getschedparam(pthread_self(), &policy, &sp); | |
2715 *priority_ptr = sp.sched_priority; | |
2716 #else | |
2717 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
2718 #endif | |
2719 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
2720 } | |
2721 | |
2722 // Hint to the underlying OS that a task switch would not be good. | |
2723 // Void return because it's a hint and can fail. | |
2724 void os::hint_no_preempt() {} | |
2725 | |
2726 //////////////////////////////////////////////////////////////////////////////// | |
2727 // suspend/resume support | |
2728 | |
2729 // the low-level signal-based suspend/resume support is a remnant from the | |
2730 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2731 // within hotspot. Now there is a single use-case for this: | |
2732 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2733 // that runs in the watcher thread. | |
2734 // The remaining code is greatly simplified from the more general suspension | |
2735 // code that used to be used. | |
2736 // | |
2737 // The protocol is quite simple: | |
2738 // - suspend: | |
2739 // - sends a signal to the target thread | |
2740 // - polls the suspend state of the osthread using a yield loop | |
2741 // - target thread signal handler (SR_handler) sets suspend state | |
2742 // and blocks in sigsuspend until continued | |
2743 // - resume: | |
2744 // - sets target osthread state to continue | |
2745 // - sends signal to end the sigsuspend loop in the SR_handler | |
2746 // | |
2747 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
2748 // | |
2749 | |
2750 static void resume_clear_context(OSThread *osthread) { | |
2751 osthread->set_ucontext(NULL); | |
2752 osthread->set_siginfo(NULL); | |
2753 } | |
2754 | |
2755 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
2756 osthread->set_ucontext(context); | |
2757 osthread->set_siginfo(siginfo); | |
2758 } | |
2759 | |
2760 // | |
2761 // Handler function invoked when a thread's execution is suspended or | |
2762 // resumed. We have to be careful that only async-safe functions are | |
2763 // called here (Note: most pthread functions are not async safe and | |
2764 // should be avoided.) | |
2765 // | |
2766 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
2767 // interface point of view, but sigwait() prevents the signal hander | |
2768 // from being run. libpthread would get very confused by not having | |
2769 // its signal handlers run and prevents sigwait()'s use with the | |
2770 // mutex granting granting signal. | |
2771 // | |
10405 | 2772 // Currently only ever called on the VMThread or JavaThread |
3960 | 2773 // |
2774 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
2775 // Save and restore errno to avoid confusing native code with EINTR | |
2776 // after sigsuspend. | |
2777 int old_errno = errno; | |
2778 | |
2779 Thread* thread = Thread::current(); | |
2780 OSThread* osthread = thread->osthread(); | |
10405 | 2781 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
2782 | |
2783 os::SuspendResume::State current = osthread->sr.state(); | |
2784 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
3960 | 2785 suspend_save_context(osthread, siginfo, context); |
2786 | |
10405 | 2787 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
2788 os::SuspendResume::State state = osthread->sr.suspended(); | |
2789 if (state == os::SuspendResume::SR_SUSPENDED) { | |
2790 sigset_t suspend_set; // signals for sigsuspend() | |
2791 | |
2792 // get current set of blocked signals and unblock resume signal | |
2793 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
2794 sigdelset(&suspend_set, SR_signum); | |
2795 | |
2796 sr_semaphore.signal(); | |
2797 // wait here until we are resumed | |
2798 while (1) { | |
2799 sigsuspend(&suspend_set); | |
2800 | |
2801 os::SuspendResume::State result = osthread->sr.running(); | |
2802 if (result == os::SuspendResume::SR_RUNNING) { | |
2803 sr_semaphore.signal(); | |
2804 break; | |
2805 } else if (result != os::SuspendResume::SR_SUSPENDED) { | |
2806 ShouldNotReachHere(); | |
2807 } | |
2808 } | |
2809 | |
2810 } else if (state == os::SuspendResume::SR_RUNNING) { | |
2811 // request was cancelled, continue | |
2812 } else { | |
2813 ShouldNotReachHere(); | |
2814 } | |
3960 | 2815 |
2816 resume_clear_context(osthread); | |
10405 | 2817 } else if (current == os::SuspendResume::SR_RUNNING) { |
2818 // request was cancelled, continue | |
2819 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
2820 // ignore | |
3960 | 2821 } else { |
10405 | 2822 // ignore |
3960 | 2823 } |
2824 | |
2825 errno = old_errno; | |
2826 } | |
2827 | |
2828 | |
2829 static int SR_initialize() { | |
2830 struct sigaction act; | |
2831 char *s; | |
2832 /* Get signal number to use for suspend/resume */ | |
2833 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
2834 int sig = ::strtol(s, 0, 10); | |
2835 if (sig > 0 || sig < NSIG) { | |
2836 SR_signum = sig; | |
2837 } | |
2838 } | |
2839 | |
2840 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
2841 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
2842 | |
2843 sigemptyset(&SR_sigset); | |
2844 sigaddset(&SR_sigset, SR_signum); | |
2845 | |
2846 /* Set up signal handler for suspend/resume */ | |
2847 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
2848 act.sa_handler = (void (*)(int)) SR_handler; | |
2849 | |
2850 // SR_signum is blocked by default. | |
2851 // 4528190 - We also need to block pthread restart signal (32 on all | |
2852 // supported Bsd platforms). Note that BsdThreads need to block | |
2853 // this signal for all threads to work properly. So we don't have | |
2854 // to use hard-coded signal number when setting up the mask. | |
2855 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
2856 | |
2857 if (sigaction(SR_signum, &act, 0) == -1) { | |
2858 return -1; | |
2859 } | |
2860 | |
2861 // Save signal flag | |
2862 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
2863 return 0; | |
2864 } | |
2865 | |
10405 | 2866 static int sr_notify(OSThread* osthread) { |
2867 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2868 assert_status(status == 0, status, "pthread_kill"); | |
2869 return status; | |
2870 } | |
2871 | |
2872 // "Randomly" selected value for how long we want to spin | |
2873 // before bailing out on suspending a thread, also how often | |
2874 // we send a signal to a thread we want to resume | |
2875 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
2876 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
3960 | 2877 |
2878 // returns true on success and false on error - really an error is fatal | |
2879 // but this seems the normal response to library errors | |
2880 static bool do_suspend(OSThread* osthread) { | |
10405 | 2881 assert(osthread->sr.is_running(), "thread should be running"); |
2882 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
2883 | |
3960 | 2884 // mark as suspended and send signal |
10405 | 2885 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
2886 // failed to switch, state wasn't running? | |
2887 ShouldNotReachHere(); | |
3960 | 2888 return false; |
2889 } | |
10405 | 2890 |
2891 if (sr_notify(osthread) != 0) { | |
2892 ShouldNotReachHere(); | |
2893 } | |
2894 | |
2895 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
2896 while (true) { | |
2897 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
2898 break; | |
2899 } else { | |
2900 // timeout | |
2901 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
2902 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
2903 return false; | |
2904 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
2905 // make sure that we consume the signal on the semaphore as well | |
2906 sr_semaphore.wait(); | |
2907 break; | |
2908 } else { | |
2909 ShouldNotReachHere(); | |
2910 return false; | |
2911 } | |
2912 } | |
2913 } | |
2914 | |
2915 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
2916 return true; | |
3960 | 2917 } |
2918 | |
2919 static void do_resume(OSThread* osthread) { | |
2920 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 2921 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
2922 | |
2923 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
2924 // failed to switch to WAKEUP_REQUEST | |
2925 ShouldNotReachHere(); | |
2926 return; | |
2927 } | |
2928 | |
2929 while (true) { | |
2930 if (sr_notify(osthread) == 0) { | |
2931 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
2932 if (osthread->sr.is_running()) { | |
2933 return; | |
2934 } | |
2935 } | |
2936 } else { | |
2937 ShouldNotReachHere(); | |
3960 | 2938 } |
2939 } | |
10405 | 2940 |
2941 guarantee(osthread->sr.is_running(), "Must be running!"); | |
3960 | 2942 } |
2943 | |
2944 //////////////////////////////////////////////////////////////////////////////// | |
2945 // interrupt support | |
2946 | |
2947 void os::interrupt(Thread* thread) { | |
2948 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2949 "possibility of dangling Thread pointer"); | |
2950 | |
2951 OSThread* osthread = thread->osthread(); | |
2952 | |
2953 if (!osthread->interrupted()) { | |
2954 osthread->set_interrupted(true); | |
2955 // More than one thread can get here with the same value of osthread, | |
2956 // resulting in multiple notifications. We do, however, want the store | |
2957 // to interrupted() to be visible to other threads before we execute unpark(). | |
2958 OrderAccess::fence(); | |
2959 ParkEvent * const slp = thread->_SleepEvent ; | |
2960 if (slp != NULL) slp->unpark() ; | |
2961 } | |
2962 | |
2963 // For JSR166. Unpark even if interrupt status already was set | |
2964 if (thread->is_Java_thread()) | |
2965 ((JavaThread*)thread)->parker()->unpark(); | |
2966 | |
2967 ParkEvent * ev = thread->_ParkEvent ; | |
2968 if (ev != NULL) ev->unpark() ; | |
2969 | |
2970 } | |
2971 | |
2972 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
2973 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2974 "possibility of dangling Thread pointer"); | |
2975 | |
2976 OSThread* osthread = thread->osthread(); | |
2977 | |
2978 bool interrupted = osthread->interrupted(); | |
2979 | |
2980 if (interrupted && clear_interrupted) { | |
2981 osthread->set_interrupted(false); | |
2982 // consider thread->_SleepEvent->reset() ... optional optimization | |
2983 } | |
2984 | |
2985 return interrupted; | |
2986 } | |
2987 | |
2988 /////////////////////////////////////////////////////////////////////////////////// | |
2989 // signal handling (except suspend/resume) | |
2990 | |
2991 // This routine may be used by user applications as a "hook" to catch signals. | |
2992 // The user-defined signal handler must pass unrecognized signals to this | |
2993 // routine, and if it returns true (non-zero), then the signal handler must | |
2994 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
2995 // routine will never retun false (zero), but instead will execute a VM panic | |
2996 // routine kill the process. | |
2997 // | |
2998 // If this routine returns false, it is OK to call it again. This allows | |
2999 // the user-defined signal handler to perform checks either before or after | |
3000 // the VM performs its own checks. Naturally, the user code would be making | |
3001 // a serious error if it tried to handle an exception (such as a null check | |
3002 // or breakpoint) that the VM was generating for its own correct operation. | |
3003 // | |
3004 // This routine may recognize any of the following kinds of signals: | |
3005 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3006 // It should be consulted by handlers for any of those signals. | |
3007 // | |
3008 // The caller of this routine must pass in the three arguments supplied | |
3009 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3010 // field of the structure passed to sigaction(). This routine assumes that | |
3011 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3012 // | |
3013 // Note that the VM will print warnings if it detects conflicting signal | |
3014 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3015 // | |
3016 extern "C" JNIEXPORT int | |
3017 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
3018 void* ucontext, int abort_if_unrecognized); | |
3019 | |
3020 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3021 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 3022 int orig_errno = errno; // Preserve errno value over signal handler. |
3960 | 3023 JVM_handle_bsd_signal(sig, info, uc, true); |
8067 | 3024 errno = orig_errno; |
3960 | 3025 } |
3026 | |
3027 | |
3028 // This boolean allows users to forward their own non-matching signals | |
3029 // to JVM_handle_bsd_signal, harmlessly. | |
3030 bool os::Bsd::signal_handlers_are_installed = false; | |
3031 | |
3032 // For signal-chaining | |
3033 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
3034 unsigned int os::Bsd::sigs = 0; | |
3035 bool os::Bsd::libjsig_is_loaded = false; | |
3036 typedef struct sigaction *(*get_signal_t)(int); | |
3037 get_signal_t os::Bsd::get_signal_action = NULL; | |
3038 | |
3039 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
3040 struct sigaction *actp = NULL; | |
3041 | |
3042 if (libjsig_is_loaded) { | |
3043 // Retrieve the old signal handler from libjsig | |
3044 actp = (*get_signal_action)(sig); | |
3045 } | |
3046 if (actp == NULL) { | |
3047 // Retrieve the preinstalled signal handler from jvm | |
3048 actp = get_preinstalled_handler(sig); | |
3049 } | |
3050 | |
3051 return actp; | |
3052 } | |
3053 | |
3054 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3055 siginfo_t *siginfo, void *context) { | |
3056 // Call the old signal handler | |
3057 if (actp->sa_handler == SIG_DFL) { | |
3058 // It's more reasonable to let jvm treat it as an unexpected exception | |
3059 // instead of taking the default action. | |
3060 return false; | |
3061 } else if (actp->sa_handler != SIG_IGN) { | |
3062 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
3063 // automaticlly block the signal | |
3064 sigaddset(&(actp->sa_mask), sig); | |
3065 } | |
3066 | |
3067 sa_handler_t hand; | |
3068 sa_sigaction_t sa; | |
3069 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
3070 // retrieve the chained handler | |
3071 if (siginfo_flag_set) { | |
3072 sa = actp->sa_sigaction; | |
3073 } else { | |
3074 hand = actp->sa_handler; | |
3075 } | |
3076 | |
3077 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
3078 actp->sa_handler = SIG_DFL; | |
3079 } | |
3080 | |
3081 // try to honor the signal mask | |
3082 sigset_t oset; | |
3083 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
3084 | |
3085 // call into the chained handler | |
3086 if (siginfo_flag_set) { | |
3087 (*sa)(sig, siginfo, context); | |
3088 } else { | |
3089 (*hand)(sig); | |
3090 } | |
3091 | |
3092 // restore the signal mask | |
3093 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
3094 } | |
3095 // Tell jvm's signal handler the signal is taken care of. | |
3096 return true; | |
3097 } | |
3098 | |
3099 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
3100 bool chained = false; | |
3101 // signal-chaining | |
3102 if (UseSignalChaining) { | |
3103 struct sigaction *actp = get_chained_signal_action(sig); | |
3104 if (actp != NULL) { | |
3105 chained = call_chained_handler(actp, sig, siginfo, context); | |
3106 } | |
3107 } | |
3108 return chained; | |
3109 } | |
3110 | |
3111 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
3112 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
3113 return &sigact[sig]; | |
3114 } | |
3115 return NULL; | |
3116 } | |
3117 | |
3118 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
3119 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3120 sigact[sig] = oldAct; | |
3121 sigs |= (unsigned int)1 << sig; | |
3122 } | |
3123 | |
3124 // for diagnostic | |
3125 int os::Bsd::sigflags[MAXSIGNUM]; | |
3126 | |
3127 int os::Bsd::get_our_sigflags(int sig) { | |
3128 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3129 return sigflags[sig]; | |
3130 } | |
3131 | |
3132 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
3133 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3134 sigflags[sig] = flags; | |
3135 } | |
3136 | |
3137 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
3138 // Check for overwrite. | |
3139 struct sigaction oldAct; | |
3140 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3141 | |
3142 void* oldhand = oldAct.sa_sigaction | |
3143 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3144 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3145 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3146 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3147 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3148 if (AllowUserSignalHandlers || !set_installed) { | |
3149 // Do not overwrite; user takes responsibility to forward to us. | |
3150 return; | |
3151 } else if (UseSignalChaining) { | |
3152 // save the old handler in jvm | |
3153 save_preinstalled_handler(sig, oldAct); | |
3154 // libjsig also interposes the sigaction() call below and saves the | |
3155 // old sigaction on it own. | |
3156 } else { | |
3157 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3158 "%#lx for signal %d.", (long)oldhand, sig)); | |
3159 } | |
3160 } | |
3161 | |
3162 struct sigaction sigAct; | |
3163 sigfillset(&(sigAct.sa_mask)); | |
3164 sigAct.sa_handler = SIG_DFL; | |
3165 if (!set_installed) { | |
3166 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3167 } else { | |
3168 sigAct.sa_sigaction = signalHandler; | |
3169 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3170 } | |
10386
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|
3171 #if __APPLE__ |
6bf8b8bb7c19
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hseigel
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10208
diff
changeset
|
3172 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
6bf8b8bb7c19
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hseigel
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10208
diff
changeset
|
3173 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
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3174 // if the signal handler declares it will handle it on alternate stack. |
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3175 // Notice we only declare we will handle it on alt stack, but we are not |
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3176 // actually going to use real alt stack - this is just a workaround. |
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3177 // Please see ux_exception.c, method catch_mach_exception_raise for details |
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3178 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
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3179 if (sig == SIGSEGV) { |
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3180 sigAct.sa_flags |= SA_ONSTACK; |
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3181 } |
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3182 #endif |
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3183 |
3960 | 3184 // Save flags, which are set by ours |
3185 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3186 sigflags[sig] = sigAct.sa_flags; | |
3187 | |
3188 int ret = sigaction(sig, &sigAct, &oldAct); | |
3189 assert(ret == 0, "check"); | |
3190 | |
3191 void* oldhand2 = oldAct.sa_sigaction | |
3192 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3193 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3194 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3195 } | |
3196 | |
3197 // install signal handlers for signals that HotSpot needs to | |
3198 // handle in order to support Java-level exception handling. | |
3199 | |
3200 void os::Bsd::install_signal_handlers() { | |
3201 if (!signal_handlers_are_installed) { | |
3202 signal_handlers_are_installed = true; | |
3203 | |
3204 // signal-chaining | |
3205 typedef void (*signal_setting_t)(); | |
3206 signal_setting_t begin_signal_setting = NULL; | |
3207 signal_setting_t end_signal_setting = NULL; | |
3208 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3209 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3210 if (begin_signal_setting != NULL) { | |
3211 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3212 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3213 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3214 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3215 libjsig_is_loaded = true; | |
3216 assert(UseSignalChaining, "should enable signal-chaining"); | |
3217 } | |
3218 if (libjsig_is_loaded) { | |
3219 // Tell libjsig jvm is setting signal handlers | |
3220 (*begin_signal_setting)(); | |
3221 } | |
3222 | |
3223 set_signal_handler(SIGSEGV, true); | |
3224 set_signal_handler(SIGPIPE, true); | |
3225 set_signal_handler(SIGBUS, true); | |
3226 set_signal_handler(SIGILL, true); | |
3227 set_signal_handler(SIGFPE, true); | |
3228 set_signal_handler(SIGXFSZ, true); | |
3229 | |
3230 #if defined(__APPLE__) | |
3231 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
3232 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
3233 // signal handler that's placed on our process by CrashReporter. This disables | |
3234 // CrashReporter-based reporting. | |
3235 // | |
3236 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
3237 // on caught fatal signals. | |
3238 // | |
3239 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
3240 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
3241 // exception handling, while leaving the standard BSD signal handlers functional. | |
3242 kern_return_t kr; | |
3243 kr = task_set_exception_ports(mach_task_self(), | |
3244 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
3245 MACH_PORT_NULL, | |
3246 EXCEPTION_STATE_IDENTITY, | |
3247 MACHINE_THREAD_STATE); | |
3248 | |
3249 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
3250 #endif | |
3251 | |
3252 if (libjsig_is_loaded) { | |
3253 // Tell libjsig jvm finishes setting signal handlers | |
3254 (*end_signal_setting)(); | |
3255 } | |
3256 | |
3257 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3258 // and if UserSignalHandler is installed all bets are off | |
3259 if (CheckJNICalls) { | |
3260 if (libjsig_is_loaded) { | |
3261 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
3262 check_signals = false; | |
3263 } | |
3264 if (AllowUserSignalHandlers) { | |
3265 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
3266 check_signals = false; | |
3267 } | |
3268 } | |
3269 } | |
3270 } | |
3271 | |
3272 | |
3273 ///// | |
3274 // glibc on Bsd platform uses non-documented flag | |
3275 // to indicate, that some special sort of signal | |
3276 // trampoline is used. | |
3277 // We will never set this flag, and we should | |
3278 // ignore this flag in our diagnostic | |
3279 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3280 #undef SIGNIFICANT_SIGNAL_MASK | |
3281 #endif | |
3282 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3283 | |
3284 static const char* get_signal_handler_name(address handler, | |
3285 char* buf, int buflen) { | |
3286 int offset; | |
3287 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3288 if (found) { | |
3289 // skip directory names | |
3290 const char *p1, *p2; | |
3291 p1 = buf; | |
3292 size_t len = strlen(os::file_separator()); | |
3293 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3294 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3295 } else { | |
3296 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3297 } | |
3298 return buf; | |
3299 } | |
3300 | |
3301 static void print_signal_handler(outputStream* st, int sig, | |
3302 char* buf, size_t buflen) { | |
3303 struct sigaction sa; | |
3304 | |
3305 sigaction(sig, NULL, &sa); | |
3306 | |
3307 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3308 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3309 | |
3310 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3311 | |
3312 address handler = (sa.sa_flags & SA_SIGINFO) | |
3313 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3314 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3315 | |
3316 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3317 st->print("SIG_DFL"); | |
3318 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3319 st->print("SIG_IGN"); | |
3320 } else { | |
3321 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3322 } | |
3323 | |
3324 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
3325 | |
3326 address rh = VMError::get_resetted_sighandler(sig); | |
3327 // May be, handler was resetted by VMError? | |
3328 if(rh != NULL) { | |
3329 handler = rh; | |
3330 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3331 } | |
3332 | |
3333 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
3334 | |
3335 // Check: is it our handler? | |
3336 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3337 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3338 // It is our signal handler | |
3339 // check for flags, reset system-used one! | |
3340 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3341 st->print( | |
3342 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3343 os::Bsd::get_our_sigflags(sig)); | |
3344 } | |
3345 } | |
3346 st->cr(); | |
3347 } | |
3348 | |
3349 | |
3350 #define DO_SIGNAL_CHECK(sig) \ | |
3351 if (!sigismember(&check_signal_done, sig)) \ | |
3352 os::Bsd::check_signal_handler(sig) | |
3353 | |
3354 // This method is a periodic task to check for misbehaving JNI applications | |
3355 // under CheckJNI, we can add any periodic checks here | |
3356 | |
3357 void os::run_periodic_checks() { | |
3358 | |
3359 if (check_signals == false) return; | |
3360 | |
3361 // SEGV and BUS if overridden could potentially prevent | |
3362 // generation of hs*.log in the event of a crash, debugging | |
3363 // such a case can be very challenging, so we absolutely | |
3364 // check the following for a good measure: | |
3365 DO_SIGNAL_CHECK(SIGSEGV); | |
3366 DO_SIGNAL_CHECK(SIGILL); | |
3367 DO_SIGNAL_CHECK(SIGFPE); | |
3368 DO_SIGNAL_CHECK(SIGBUS); | |
3369 DO_SIGNAL_CHECK(SIGPIPE); | |
3370 DO_SIGNAL_CHECK(SIGXFSZ); | |
3371 | |
3372 | |
3373 // ReduceSignalUsage allows the user to override these handlers | |
3374 // see comments at the very top and jvm_solaris.h | |
3375 if (!ReduceSignalUsage) { | |
3376 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3377 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3378 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3379 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3380 } | |
3381 | |
3382 DO_SIGNAL_CHECK(SR_signum); | |
3383 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3384 } | |
3385 | |
3386 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3387 | |
3388 static os_sigaction_t os_sigaction = NULL; | |
3389 | |
3390 void os::Bsd::check_signal_handler(int sig) { | |
3391 char buf[O_BUFLEN]; | |
3392 address jvmHandler = NULL; | |
3393 | |
3394 | |
3395 struct sigaction act; | |
3396 if (os_sigaction == NULL) { | |
3397 // only trust the default sigaction, in case it has been interposed | |
3398 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3399 if (os_sigaction == NULL) return; | |
3400 } | |
3401 | |
3402 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3403 | |
3404 | |
3405 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3406 | |
3407 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3408 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3409 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3410 | |
3411 | |
3412 switch(sig) { | |
3413 case SIGSEGV: | |
3414 case SIGBUS: | |
3415 case SIGFPE: | |
3416 case SIGPIPE: | |
3417 case SIGILL: | |
3418 case SIGXFSZ: | |
3419 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3420 break; | |
3421 | |
3422 case SHUTDOWN1_SIGNAL: | |
3423 case SHUTDOWN2_SIGNAL: | |
3424 case SHUTDOWN3_SIGNAL: | |
3425 case BREAK_SIGNAL: | |
3426 jvmHandler = (address)user_handler(); | |
3427 break; | |
3428 | |
3429 case INTERRUPT_SIGNAL: | |
3430 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3431 break; | |
3432 | |
3433 default: | |
3434 if (sig == SR_signum) { | |
3435 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3436 } else { | |
3437 return; | |
3438 } | |
3439 break; | |
3440 } | |
3441 | |
3442 if (thisHandler != jvmHandler) { | |
3443 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3444 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3445 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3446 // No need to check this sig any longer | |
3447 sigaddset(&check_signal_done, sig); | |
3448 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3449 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3450 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
3451 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3452 // No need to check this sig any longer | |
3453 sigaddset(&check_signal_done, sig); | |
3454 } | |
3455 | |
3456 // Dump all the signal | |
3457 if (sigismember(&check_signal_done, sig)) { | |
3458 print_signal_handlers(tty, buf, O_BUFLEN); | |
3459 } | |
3460 } | |
3461 | |
3462 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3463 | |
3464 extern bool signal_name(int signo, char* buf, size_t len); | |
3465 | |
3466 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3467 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3468 // signal | |
3469 if (!signal_name(exception_code, buf, size)) { | |
3470 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3471 } | |
3472 return buf; | |
3473 } else { | |
3474 return NULL; | |
3475 } | |
3476 } | |
3477 | |
3478 // this is called _before_ the most of global arguments have been parsed | |
3479 void os::init(void) { | |
3480 char dummy; /* used to get a guess on initial stack address */ | |
3481 // first_hrtime = gethrtime(); | |
3482 | |
3483 // With BsdThreads the JavaMain thread pid (primordial thread) | |
3484 // is different than the pid of the java launcher thread. | |
3485 // So, on Bsd, the launcher thread pid is passed to the VM | |
3486 // via the sun.java.launcher.pid property. | |
3487 // Use this property instead of getpid() if it was correctly passed. | |
3488 // See bug 6351349. | |
3489 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3490 | |
3491 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3492 | |
3493 clock_tics_per_sec = CLK_TCK; | |
3494 | |
3495 init_random(1234567); | |
3496 | |
3497 ThreadCritical::initialize(); | |
3498 | |
3499 Bsd::set_page_size(getpagesize()); | |
3500 if (Bsd::page_size() == -1) { | |
3501 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
3502 strerror(errno))); | |
3503 } | |
3504 init_page_sizes((size_t) Bsd::page_size()); | |
3505 | |
3506 Bsd::initialize_system_info(); | |
3507 | |
3508 // main_thread points to the aboriginal thread | |
3509 Bsd::_main_thread = pthread_self(); | |
3510 | |
3511 Bsd::clock_init(); | |
3512 initial_time_count = os::elapsed_counter(); | |
3513 | |
3514 #ifdef __APPLE__ | |
3515 // XXXDARWIN | |
3516 // Work around the unaligned VM callbacks in hotspot's | |
3517 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
3518 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
3519 // alignment when doing symbol lookup. To work around this, we force early | |
3520 // binding of all symbols now, thus binding when alignment is known-good. | |
3521 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
3522 #endif | |
3523 } | |
3524 | |
3525 // To install functions for atexit system call | |
3526 extern "C" { | |
3527 static void perfMemory_exit_helper() { | |
3528 perfMemory_exit(); | |
3529 } | |
3530 } | |
3531 | |
3532 // this is called _after_ the global arguments have been parsed | |
3533 jint os::init_2(void) | |
3534 { | |
3535 // Allocate a single page and mark it as readable for safepoint polling | |
3536 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3537 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
3538 | |
3539 os::set_polling_page( polling_page ); | |
3540 | |
3541 #ifndef PRODUCT | |
3542 if(Verbose && PrintMiscellaneous) | |
3543 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
3544 #endif | |
3545 | |
3546 if (!UseMembar) { | |
3547 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
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3548 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
3960 | 3549 os::set_memory_serialize_page( mem_serialize_page ); |
3550 | |
3551 #ifndef PRODUCT | |
3552 if(Verbose && PrintMiscellaneous) | |
3553 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3554 #endif | |
3555 } | |
3556 | |
3557 os::large_page_init(); | |
3558 | |
3559 // initialize suspend/resume support - must do this before signal_sets_init() | |
3560 if (SR_initialize() != 0) { | |
3561 perror("SR_initialize failed"); | |
3562 return JNI_ERR; | |
3563 } | |
3564 | |
3565 Bsd::signal_sets_init(); | |
3566 Bsd::install_signal_handlers(); | |
3567 | |
3568 // Check minimum allowable stack size for thread creation and to initialize | |
3569 // the java system classes, including StackOverflowError - depends on page | |
3570 // size. Add a page for compiler2 recursion in main thread. | |
3571 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3572 // class initialization depending on 32 or 64 bit VM. | |
3573 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
3574 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
3575 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
3576 | |
3577 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3578 if (threadStackSizeInBytes != 0 && | |
3579 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
3580 tty->print_cr("\nThe stack size specified is too small, " | |
3581 "Specify at least %dk", | |
3582 os::Bsd::min_stack_allowed/ K); | |
3583 return JNI_ERR; | |
3584 } | |
3585 | |
3586 // Make the stack size a multiple of the page size so that | |
3587 // the yellow/red zones can be guarded. | |
3588 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
3589 vm_page_size())); | |
3590 | |
3591 if (MaxFDLimit) { | |
3592 // set the number of file descriptors to max. print out error | |
3593 // if getrlimit/setrlimit fails but continue regardless. | |
3594 struct rlimit nbr_files; | |
3595 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3596 if (status != 0) { | |
3597 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3598 perror("os::init_2 getrlimit failed"); | |
3599 } else { | |
3600 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3601 | |
3602 #ifdef __APPLE__ | |
3603 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
3604 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
3605 // be used instead | |
3606 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
3607 #endif | |
3608 | |
3609 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3610 if (status != 0) { | |
3611 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3612 perror("os::init_2 setrlimit failed"); | |
3613 } | |
3614 } | |
3615 } | |
3616 | |
3617 // at-exit methods are called in the reverse order of their registration. | |
3618 // atexit functions are called on return from main or as a result of a | |
3619 // call to exit(3C). There can be only 32 of these functions registered | |
3620 // and atexit() does not set errno. | |
3621 | |
3622 if (PerfAllowAtExitRegistration) { | |
3623 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3624 // atexit functions can be delayed until process exit time, which | |
3625 // can be problematic for embedded VM situations. Embedded VMs should | |
3626 // call DestroyJavaVM() to assure that VM resources are released. | |
3627 | |
3628 // note: perfMemory_exit_helper atexit function may be removed in | |
3629 // the future if the appropriate cleanup code can be added to the | |
3630 // VM_Exit VMOperation's doit method. | |
3631 if (atexit(perfMemory_exit_helper) != 0) { | |
3632 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
3633 } | |
3634 } | |
3635 | |
3636 // initialize thread priority policy | |
3637 prio_init(); | |
3638 | |
4006 | 3639 #ifdef __APPLE__ |
3640 // dynamically link to objective c gc registration | |
3641 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
3642 if (handleLibObjc != NULL) { | |
3643 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
3644 } | |
3645 #endif | |
3646 | |
3960 | 3647 return JNI_OK; |
3648 } | |
3649 | |
3650 // this is called at the end of vm_initialization | |
3651 void os::init_3(void) { } | |
3652 | |
3653 // Mark the polling page as unreadable | |
3654 void os::make_polling_page_unreadable(void) { | |
3655 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
3656 fatal("Could not disable polling page"); | |
3657 }; | |
3658 | |
3659 // Mark the polling page as readable | |
3660 void os::make_polling_page_readable(void) { | |
3661 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
3662 fatal("Could not enable polling page"); | |
3663 } | |
3664 }; | |
3665 | |
3666 int os::active_processor_count() { | |
3667 return _processor_count; | |
3668 } | |
3669 | |
4006 | 3670 void os::set_native_thread_name(const char *name) { |
3671 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
3672 // This is only supported in Snow Leopard and beyond | |
3673 if (name != NULL) { | |
3674 // Add a "Java: " prefix to the name | |
3675 char buf[MAXTHREADNAMESIZE]; | |
3676 snprintf(buf, sizeof(buf), "Java: %s", name); | |
3677 pthread_setname_np(buf); | |
3678 } | |
3679 #endif | |
3680 } | |
3681 | |
3960 | 3682 bool os::distribute_processes(uint length, uint* distribution) { |
3683 // Not yet implemented. | |
3684 return false; | |
3685 } | |
3686 | |
3687 bool os::bind_to_processor(uint processor_id) { | |
3688 // Not yet implemented. | |
3689 return false; | |
3690 } | |
3691 | |
10405 | 3692 void os::SuspendedThreadTask::internal_do_task() { |
3693 if (do_suspend(_thread->osthread())) { | |
3694 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
3695 do_task(context); | |
3696 do_resume(_thread->osthread()); | |
3697 } | |
3698 } | |
3699 | |
3960 | 3700 /// |
10405 | 3701 class PcFetcher : public os::SuspendedThreadTask { |
3702 public: | |
3703 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
3704 ExtendedPC result(); | |
3705 protected: | |
3706 void do_task(const os::SuspendedThreadTaskContext& context); | |
3707 private: | |
3708 ExtendedPC _epc; | |
3709 }; | |
3710 | |
3711 ExtendedPC PcFetcher::result() { | |
3712 guarantee(is_done(), "task is not done yet."); | |
3713 return _epc; | |
3714 } | |
3715 | |
3716 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
3717 Thread* thread = context.thread(); | |
3718 OSThread* osthread = thread->osthread(); | |
3719 if (osthread->ucontext() != NULL) { | |
3720 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
3721 } else { | |
3722 // NULL context is unexpected, double-check this is the VMThread | |
3723 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
3724 } | |
3725 } | |
3960 | 3726 |
3727 // Suspends the target using the signal mechanism and then grabs the PC before | |
3728 // resuming the target. Used by the flat-profiler only | |
3729 ExtendedPC os::get_thread_pc(Thread* thread) { | |
3730 // Make sure that it is called by the watcher for the VMThread | |
3731 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
3732 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
3733 | |
10405 | 3734 PcFetcher fetcher(thread); |
3735 fetcher.run(); | |
3736 return fetcher.result(); | |
3960 | 3737 } |
3738 | |
3739 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
3740 { | |
3741 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
3742 } | |
3743 | |
3744 //////////////////////////////////////////////////////////////////////////////// | |
3745 // debug support | |
3746 | |
3747 bool os::find(address addr, outputStream* st) { | |
3748 Dl_info dlinfo; | |
3749 memset(&dlinfo, 0, sizeof(dlinfo)); | |
3750 if (dladdr(addr, &dlinfo)) { | |
3751 st->print(PTR_FORMAT ": ", addr); | |
3752 if (dlinfo.dli_sname != NULL) { | |
3753 st->print("%s+%#x", dlinfo.dli_sname, | |
3754 addr - (intptr_t)dlinfo.dli_saddr); | |
3755 } else if (dlinfo.dli_fname) { | |
3756 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
3757 } else { | |
3758 st->print("<absolute address>"); | |
3759 } | |
3760 if (dlinfo.dli_fname) { | |
3761 st->print(" in %s", dlinfo.dli_fname); | |
3762 } | |
3763 if (dlinfo.dli_fbase) { | |
3764 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
3765 } | |
3766 st->cr(); | |
3767 | |
3768 if (Verbose) { | |
3769 // decode some bytes around the PC | |
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3770 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
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3771 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
3960 | 3772 address lowest = (address) dlinfo.dli_sname; |
3773 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
3774 if (begin < lowest) begin = lowest; | |
3775 Dl_info dlinfo2; | |
3776 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
3777 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
3778 end = (address) dlinfo2.dli_saddr; | |
3779 Disassembler::decode(begin, end, st); | |
3780 } | |
3781 return true; | |
3782 } | |
3783 return false; | |
3784 } | |
3785 | |
3786 //////////////////////////////////////////////////////////////////////////////// | |
3787 // misc | |
3788 | |
3789 // This does not do anything on Bsd. This is basically a hook for being | |
3790 // able to use structured exception handling (thread-local exception filters) | |
3791 // on, e.g., Win32. | |
3792 void | |
3793 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
3794 JavaCallArguments* args, Thread* thread) { | |
3795 f(value, method, args, thread); | |
3796 } | |
3797 | |
3798 void os::print_statistics() { | |
3799 } | |
3800 | |
3801 int os::message_box(const char* title, const char* message) { | |
3802 int i; | |
3803 fdStream err(defaultStream::error_fd()); | |
3804 for (i = 0; i < 78; i++) err.print_raw("="); | |
3805 err.cr(); | |
3806 err.print_raw_cr(title); | |
3807 for (i = 0; i < 78; i++) err.print_raw("-"); | |
3808 err.cr(); | |
3809 err.print_raw_cr(message); | |
3810 for (i = 0; i < 78; i++) err.print_raw("="); | |
3811 err.cr(); | |
3812 | |
3813 char buf[16]; | |
3814 // Prevent process from exiting upon "read error" without consuming all CPU | |
3815 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
3816 | |
3817 return buf[0] == 'y' || buf[0] == 'Y'; | |
3818 } | |
3819 | |
3820 int os::stat(const char *path, struct stat *sbuf) { | |
3821 char pathbuf[MAX_PATH]; | |
3822 if (strlen(path) > MAX_PATH - 1) { | |
3823 errno = ENAMETOOLONG; | |
3824 return -1; | |
3825 } | |
3826 os::native_path(strcpy(pathbuf, path)); | |
3827 return ::stat(pathbuf, sbuf); | |
3828 } | |
3829 | |
3830 bool os::check_heap(bool force) { | |
3831 return true; | |
3832 } | |
3833 | |
3834 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
3835 return ::vsnprintf(buf, count, format, args); | |
3836 } | |
3837 | |
3838 // Is a (classpath) directory empty? | |
3839 bool os::dir_is_empty(const char* path) { | |
3840 DIR *dir = NULL; | |
3841 struct dirent *ptr; | |
3842 | |
3843 dir = opendir(path); | |
3844 if (dir == NULL) return true; | |
3845 | |
3846 /* Scan the directory */ | |
3847 bool result = true; | |
3848 char buf[sizeof(struct dirent) + MAX_PATH]; | |
3849 while (result && (ptr = ::readdir(dir)) != NULL) { | |
3850 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
3851 result = false; | |
3852 } | |
3853 } | |
3854 closedir(dir); | |
3855 return result; | |
3856 } | |
3857 | |
3858 // This code originates from JDK's sysOpen and open64_w | |
3859 // from src/solaris/hpi/src/system_md.c | |
3860 | |
3861 #ifndef O_DELETE | |
3862 #define O_DELETE 0x10000 | |
3863 #endif | |
3864 | |
3865 // Open a file. Unlink the file immediately after open returns | |
3866 // if the specified oflag has the O_DELETE flag set. | |
3867 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
3868 | |
3869 int os::open(const char *path, int oflag, int mode) { | |
3870 | |
3871 if (strlen(path) > MAX_PATH - 1) { | |
3872 errno = ENAMETOOLONG; | |
3873 return -1; | |
3874 } | |
3875 int fd; | |
3876 int o_delete = (oflag & O_DELETE); | |
3877 oflag = oflag & ~O_DELETE; | |
3878 | |
3879 fd = ::open(path, oflag, mode); | |
3880 if (fd == -1) return -1; | |
3881 | |
3882 //If the open succeeded, the file might still be a directory | |
3883 { | |
3884 struct stat buf; | |
3885 int ret = ::fstat(fd, &buf); | |
3886 int st_mode = buf.st_mode; | |
3887 | |
3888 if (ret != -1) { | |
3889 if ((st_mode & S_IFMT) == S_IFDIR) { | |
3890 errno = EISDIR; | |
3891 ::close(fd); | |
3892 return -1; | |
3893 } | |
3894 } else { | |
3895 ::close(fd); | |
3896 return -1; | |
3897 } | |
3898 } | |
3899 | |
3900 /* | |
3901 * All file descriptors that are opened in the JVM and not | |
3902 * specifically destined for a subprocess should have the | |
3903 * close-on-exec flag set. If we don't set it, then careless 3rd | |
3904 * party native code might fork and exec without closing all | |
3905 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
3906 * UNIXProcess.c), and this in turn might: | |
3907 * | |
3908 * - cause end-of-file to fail to be detected on some file | |
3909 * descriptors, resulting in mysterious hangs, or | |
3910 * | |
3911 * - might cause an fopen in the subprocess to fail on a system | |
3912 * suffering from bug 1085341. | |
3913 * | |
3914 * (Yes, the default setting of the close-on-exec flag is a Unix | |
3915 * design flaw) | |
3916 * | |
3917 * See: | |
3918 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
3919 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
3920 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
3921 */ | |
3922 #ifdef FD_CLOEXEC | |
3923 { | |
3924 int flags = ::fcntl(fd, F_GETFD); | |
3925 if (flags != -1) | |
3926 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
3927 } | |
3928 #endif | |
3929 | |
3930 if (o_delete != 0) { | |
3931 ::unlink(path); | |
3932 } | |
3933 return fd; | |
3934 } | |
3935 | |
3936 | |
3937 // create binary file, rewriting existing file if required | |
3938 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
3939 int oflags = O_WRONLY | O_CREAT; | |
3940 if (!rewrite_existing) { | |
3941 oflags |= O_EXCL; | |
3942 } | |
3943 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
3944 } | |
3945 | |
3946 // return current position of file pointer | |
3947 jlong os::current_file_offset(int fd) { | |
3948 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
3949 } | |
3950 | |
3951 // move file pointer to the specified offset | |
3952 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
3953 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
3954 } | |
3955 | |
3956 // This code originates from JDK's sysAvailable | |
3957 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
3958 | |
3959 int os::available(int fd, jlong *bytes) { | |
3960 jlong cur, end; | |
3961 int mode; | |
3962 struct stat buf; | |
3963 | |
3964 if (::fstat(fd, &buf) >= 0) { | |
3965 mode = buf.st_mode; | |
3966 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
3967 /* | |
3968 * XXX: is the following call interruptible? If so, this might | |
3969 * need to go through the INTERRUPT_IO() wrapper as for other | |
3970 * blocking, interruptible calls in this file. | |
3971 */ | |
3972 int n; | |
3973 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
3974 *bytes = n; | |
3975 return 1; | |
3976 } | |
3977 } | |
3978 } | |
3979 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
3980 return 0; | |
3981 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
3982 return 0; | |
3983 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
3984 return 0; | |
3985 } | |
3986 *bytes = end - cur; | |
3987 return 1; | |
3988 } | |
3989 | |
3990 int os::socket_available(int fd, jint *pbytes) { | |
3991 if (fd < 0) | |
3992 return OS_OK; | |
3993 | |
3994 int ret; | |
3995 | |
3996 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
3997 | |
3998 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
3999 // is expected to return 0 on failure and 1 on success to the jdk. | |
4000 | |
4001 return (ret == OS_ERR) ? 0 : 1; | |
4002 } | |
4003 | |
4004 // Map a block of memory. | |
6197 | 4005 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4006 char *addr, size_t bytes, bool read_only, |
4007 bool allow_exec) { | |
4008 int prot; | |
4009 int flags; | |
4010 | |
4011 if (read_only) { | |
4012 prot = PROT_READ; | |
4013 flags = MAP_SHARED; | |
4014 } else { | |
4015 prot = PROT_READ | PROT_WRITE; | |
4016 flags = MAP_PRIVATE; | |
4017 } | |
4018 | |
4019 if (allow_exec) { | |
4020 prot |= PROT_EXEC; | |
4021 } | |
4022 | |
4023 if (addr != NULL) { | |
4024 flags |= MAP_FIXED; | |
4025 } | |
4026 | |
4027 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
4028 fd, file_offset); | |
4029 if (mapped_address == MAP_FAILED) { | |
4030 return NULL; | |
4031 } | |
4032 return mapped_address; | |
4033 } | |
4034 | |
4035 | |
4036 // Remap a block of memory. | |
6197 | 4037 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4038 char *addr, size_t bytes, bool read_only, |
4039 bool allow_exec) { | |
4040 // same as map_memory() on this OS | |
4041 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4042 allow_exec); | |
4043 } | |
4044 | |
4045 | |
4046 // Unmap a block of memory. | |
6197 | 4047 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
3960 | 4048 return munmap(addr, bytes) == 0; |
4049 } | |
4050 | |
4051 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
4052 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
4053 // of a thread. | |
4054 // | |
4055 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
4056 // the fast estimate available on the platform. | |
4057 | |
4058 jlong os::current_thread_cpu_time() { | |
4059 #ifdef __APPLE__ | |
4060 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
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4061 #else |
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4062 Unimplemented(); |
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4063 return 0; |
3960 | 4064 #endif |
4065 } | |
4066 | |
4067 jlong os::thread_cpu_time(Thread* thread) { | |
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4068 #ifdef __APPLE__ |
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4069 return os::thread_cpu_time(thread, true /* user + sys */); |
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4070 #else |
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4071 Unimplemented(); |
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4072 return 0; |
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4073 #endif |
3960 | 4074 } |
4075 | |
4076 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
4077 #ifdef __APPLE__ | |
4078 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
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4079 #else |
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4080 Unimplemented(); |
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4081 return 0; |
3960 | 4082 #endif |
4083 } | |
4084 | |
4085 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4086 #ifdef __APPLE__ | |
4087 struct thread_basic_info tinfo; | |
4088 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
4089 kern_return_t kr; | |
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4090 thread_t mach_thread; |
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4091 |
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4092 mach_thread = thread->osthread()->thread_id(); |
3960 | 4093 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
4094 if (kr != KERN_SUCCESS) | |
4095 return -1; | |
4096 | |
4097 if (user_sys_cpu_time) { | |
4098 jlong nanos; | |
4099 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
4100 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
4101 return nanos; | |
4102 } else { | |
4103 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
4104 } | |
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4105 #else |
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4106 Unimplemented(); |
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4107 return 0; |
3960 | 4108 #endif |
4109 } | |
4110 | |
4111 | |
4112 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4113 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4114 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4115 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4116 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4117 } | |
4118 | |
4119 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4120 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4121 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4122 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4123 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4124 } | |
4125 | |
4126 bool os::is_thread_cpu_time_supported() { | |
4127 #ifdef __APPLE__ | |
4128 return true; | |
6918 | 4129 #else |
3960 | 4130 return false; |
4131 #endif | |
4132 } | |
4133 | |
4134 // System loadavg support. Returns -1 if load average cannot be obtained. | |
4135 // Bsd doesn't yet have a (official) notion of processor sets, | |
4136 // so just return the system wide load average. | |
4137 int os::loadavg(double loadavg[], int nelem) { | |
4138 return ::getloadavg(loadavg, nelem); | |
4139 } | |
4140 | |
4141 void os::pause() { | |
4142 char filename[MAX_PATH]; | |
4143 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
4144 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
4145 } else { | |
4146 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
4147 } | |
4148 | |
4149 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
4150 if (fd != -1) { | |
4151 struct stat buf; | |
4152 ::close(fd); | |
4153 while (::stat(filename, &buf) == 0) { | |
4154 (void)::poll(NULL, 0, 100); | |
4155 } | |
4156 } else { | |
4157 jio_fprintf(stderr, | |
4158 "Could not open pause file '%s', continuing immediately.\n", filename); | |
4159 } | |
4160 } | |
4161 | |
4162 | |
4163 // Refer to the comments in os_solaris.cpp park-unpark. | |
4164 // | |
4165 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
4166 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
4167 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
4168 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
4169 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
4170 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4171 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4172 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4173 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4174 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4175 // of libpthread avoids the problem, but isn't practical. | |
4176 // | |
4177 // Possible remedies: | |
4178 // | |
4179 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4180 // This is palliative and probabilistic, however. If the thread is preempted | |
4181 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4182 // than the minimum period may have passed, and the abstime may be stale (in the | |
4183 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4184 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4185 // | |
4186 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4187 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4188 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4189 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4190 // thread. | |
4191 // | |
4192 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4193 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4194 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4195 // This also works well. In fact it avoids kernel-level scalability impediments | |
4196 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4197 // timers in a graceful fashion. | |
4198 // | |
4199 // 4. When the abstime value is in the past it appears that control returns | |
4200 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4201 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4202 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4203 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4204 // It may be possible to avoid reinitialization by checking the return | |
4205 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4206 // condvar we must establish the invariant that cond_signal() is only called | |
4207 // within critical sections protected by the adjunct mutex. This prevents | |
4208 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4209 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4210 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4211 // | |
4212 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4213 // structure when a condvar is used or initialized. cond_destroy() would | |
4214 // release the helper structure. Our reinitialize-after-timedwait fix | |
4215 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4216 // | |
4217 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4218 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4219 // and only enabling the work-around for vulnerable environments. | |
4220 | |
4221 // utility to compute the abstime argument to timedwait: | |
4222 // millis is the relative timeout time | |
4223 // abstime will be the absolute timeout time | |
4224 // TODO: replace compute_abstime() with unpackTime() | |
4225 | |
4226 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
4227 if (millis < 0) millis = 0; | |
4228 struct timeval now; | |
4229 int status = gettimeofday(&now, NULL); | |
4230 assert(status == 0, "gettimeofday"); | |
4231 jlong seconds = millis / 1000; | |
4232 millis %= 1000; | |
4233 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4234 seconds = 50000000; | |
4235 } | |
4236 abstime->tv_sec = now.tv_sec + seconds; | |
4237 long usec = now.tv_usec + millis * 1000; | |
4238 if (usec >= 1000000) { | |
4239 abstime->tv_sec += 1; | |
4240 usec -= 1000000; | |
4241 } | |
4242 abstime->tv_nsec = usec * 1000; | |
4243 return abstime; | |
4244 } | |
4245 | |
4246 | |
4247 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4248 // Conceptually TryPark() should be equivalent to park(0). | |
4249 | |
4250 int os::PlatformEvent::TryPark() { | |
4251 for (;;) { | |
4252 const int v = _Event ; | |
4253 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4254 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4255 } | |
4256 } | |
4257 | |
4258 void os::PlatformEvent::park() { // AKA "down()" | |
4259 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4260 // may call park(). | |
4261 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4262 int v ; | |
4263 for (;;) { | |
4264 v = _Event ; | |
4265 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4266 } | |
4267 guarantee (v >= 0, "invariant") ; | |
4268 if (v == 0) { | |
4269 // Do this the hard way by blocking ... | |
4270 int status = pthread_mutex_lock(_mutex); | |
4271 assert_status(status == 0, status, "mutex_lock"); | |
4272 guarantee (_nParked == 0, "invariant") ; | |
4273 ++ _nParked ; | |
4274 while (_Event < 0) { | |
4275 status = pthread_cond_wait(_cond, _mutex); | |
4276 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4277 // Treat this the same as if the wait was interrupted | |
4278 if (status == ETIMEDOUT) { status = EINTR; } | |
4279 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4280 } | |
4281 -- _nParked ; | |
4282 | |
4283 _Event = 0 ; | |
4284 status = pthread_mutex_unlock(_mutex); | |
4285 assert_status(status == 0, status, "mutex_unlock"); | |
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4286 // Paranoia to ensure our locked and lock-free paths interact |
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4287 // correctly with each other. |
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4288 OrderAccess::fence(); |
3960 | 4289 } |
4290 guarantee (_Event >= 0, "invariant") ; | |
4291 } | |
4292 | |
4293 int os::PlatformEvent::park(jlong millis) { | |
4294 guarantee (_nParked == 0, "invariant") ; | |
4295 | |
4296 int v ; | |
4297 for (;;) { | |
4298 v = _Event ; | |
4299 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4300 } | |
4301 guarantee (v >= 0, "invariant") ; | |
4302 if (v != 0) return OS_OK ; | |
4303 | |
4304 // We do this the hard way, by blocking the thread. | |
4305 // Consider enforcing a minimum timeout value. | |
4306 struct timespec abst; | |
4307 compute_abstime(&abst, millis); | |
4308 | |
4309 int ret = OS_TIMEOUT; | |
4310 int status = pthread_mutex_lock(_mutex); | |
4311 assert_status(status == 0, status, "mutex_lock"); | |
4312 guarantee (_nParked == 0, "invariant") ; | |
4313 ++_nParked ; | |
4314 | |
4315 // Object.wait(timo) will return because of | |
4316 // (a) notification | |
4317 // (b) timeout | |
4318 // (c) thread.interrupt | |
4319 // | |
4320 // Thread.interrupt and object.notify{All} both call Event::set. | |
4321 // That is, we treat thread.interrupt as a special case of notification. | |
4322 // The underlying Solaris implementation, cond_timedwait, admits | |
4323 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4324 // JVM from making those visible to Java code. As such, we must | |
4325 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4326 // | |
4327 // TODO: properly differentiate simultaneous notify+interrupt. | |
4328 // In that case, we should propagate the notify to another waiter. | |
4329 | |
4330 while (_Event < 0) { | |
4331 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
4332 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4333 pthread_cond_destroy (_cond); | |
4334 pthread_cond_init (_cond, NULL) ; | |
4335 } | |
4336 assert_status(status == 0 || status == EINTR || | |
4337 status == ETIMEDOUT, | |
4338 status, "cond_timedwait"); | |
4339 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4340 if (status == ETIMEDOUT) break ; | |
4341 // We consume and ignore EINTR and spurious wakeups. | |
4342 } | |
4343 --_nParked ; | |
4344 if (_Event >= 0) { | |
4345 ret = OS_OK; | |
4346 } | |
4347 _Event = 0 ; | |
4348 status = pthread_mutex_unlock(_mutex); | |
4349 assert_status(status == 0, status, "mutex_unlock"); | |
4350 assert (_nParked == 0, "invariant") ; | |
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4351 // Paranoia to ensure our locked and lock-free paths interact |
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4352 // correctly with each other. |
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4353 OrderAccess::fence(); |
3960 | 4354 return ret; |
4355 } | |
4356 | |
4357 void os::PlatformEvent::unpark() { | |
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4358 // Transitions for _Event: |
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4359 // 0 :=> 1 |
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4360 // 1 :=> 1 |
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4361 // -1 :=> either 0 or 1; must signal target thread |
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4362 // That is, we can safely transition _Event from -1 to either |
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4363 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4364 // unpark() calls. |
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4365 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4366 // |
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4367 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4368 // that it will take two back-to-back park() calls for the owning |
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4369 // thread to block. This has the benefit of forcing a spurious return |
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4370 // from the first park() call after an unpark() call which will help |
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4371 // shake out uses of park() and unpark() without condition variables. |
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4372 |
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4373 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4374 |
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4375 // Wait for the thread associated with the event to vacate |
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4376 int status = pthread_mutex_lock(_mutex); |
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4377 assert_status(status == 0, status, "mutex_lock"); |
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4378 int AnyWaiters = _nParked; |
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4379 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4380 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4381 AnyWaiters = 0; |
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4382 pthread_cond_signal(_cond); |
3960 | 4383 } |
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4384 status = pthread_mutex_unlock(_mutex); |
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4385 assert_status(status == 0, status, "mutex_unlock"); |
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4386 if (AnyWaiters != 0) { |
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4387 status = pthread_cond_signal(_cond); |
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4388 assert_status(status == 0, status, "cond_signal"); |
3960 | 4389 } |
4390 | |
4391 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4392 // This is safe and avoids a common class of futile wakeups. In rare | |
4393 // circumstances this can cause a thread to return prematurely from | |
4394 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4395 // simply re-test the condition and re-park itself. | |
4396 } | |
4397 | |
4398 | |
4399 // JSR166 | |
4400 // ------------------------------------------------------- | |
4401 | |
4402 /* | |
4403 * The solaris and bsd implementations of park/unpark are fairly | |
4404 * conservative for now, but can be improved. They currently use a | |
4405 * mutex/condvar pair, plus a a count. | |
4406 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4407 * sets count to 1 and signals condvar. Only one thread ever waits | |
4408 * on the condvar. Contention seen when trying to park implies that someone | |
4409 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4410 * is no need to track notifications. | |
4411 */ | |
4412 | |
4413 #define MAX_SECS 100000000 | |
4414 /* | |
4415 * This code is common to bsd and solaris and will be moved to a | |
4416 * common place in dolphin. | |
4417 * | |
4418 * The passed in time value is either a relative time in nanoseconds | |
4419 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4420 * into suitable seconds and nanoseconds components and stored in the | |
4421 * given timespec structure. | |
4422 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4423 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
4424 * overflow if times way in the future are given. Further on Solaris versions | |
4425 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4426 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
4427 * As it will be 28 years before "now + 100000000" will overflow we can | |
4428 * ignore overflow and just impose a hard-limit on seconds using the value | |
4429 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4430 * years from "now". | |
4431 */ | |
4432 | |
4433 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
4434 assert (time > 0, "convertTime"); | |
4435 | |
4436 struct timeval now; | |
4437 int status = gettimeofday(&now, NULL); | |
4438 assert(status == 0, "gettimeofday"); | |
4439 | |
4440 time_t max_secs = now.tv_sec + MAX_SECS; | |
4441 | |
4442 if (isAbsolute) { | |
4443 jlong secs = time / 1000; | |
4444 if (secs > max_secs) { | |
4445 absTime->tv_sec = max_secs; | |
4446 } | |
4447 else { | |
4448 absTime->tv_sec = secs; | |
4449 } | |
4450 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4451 } | |
4452 else { | |
4453 jlong secs = time / NANOSECS_PER_SEC; | |
4454 if (secs >= MAX_SECS) { | |
4455 absTime->tv_sec = max_secs; | |
4456 absTime->tv_nsec = 0; | |
4457 } | |
4458 else { | |
4459 absTime->tv_sec = now.tv_sec + secs; | |
4460 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4461 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4462 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4463 ++absTime->tv_sec; // note: this must be <= max_secs | |
4464 } | |
4465 } | |
4466 } | |
4467 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4468 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4469 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4470 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4471 } | |
4472 | |
4473 void Parker::park(bool isAbsolute, jlong time) { | |
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4474 // Ideally we'd do something useful while spinning, such |
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4475 // as calling unpackTime(). |
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4476 |
3960 | 4477 // Optional fast-path check: |
4478 // Return immediately if a permit is available. | |
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4479 // We depend on Atomic::xchg() having full barrier semantics |
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4480 // since we are doing a lock-free update to _counter. |
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4481 if (Atomic::xchg(0, &_counter) > 0) return; |
3960 | 4482 |
4483 Thread* thread = Thread::current(); | |
4484 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4485 JavaThread *jt = (JavaThread *)thread; | |
4486 | |
4487 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4488 // Check interrupt before trying to wait | |
4489 if (Thread::is_interrupted(thread, false)) { | |
4490 return; | |
4491 } | |
4492 | |
4493 // Next, demultiplex/decode time arguments | |
4494 struct timespec absTime; | |
4495 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
4496 return; | |
4497 } | |
4498 if (time > 0) { | |
4499 unpackTime(&absTime, isAbsolute, time); | |
4500 } | |
4501 | |
4502 | |
4503 // Enter safepoint region | |
4504 // Beware of deadlocks such as 6317397. | |
4505 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4506 // In particular a thread must never block on the Threads_lock while | |
4507 // holding the Parker:: mutex. If safepoints are pending both the | |
4508 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4509 ThreadBlockInVM tbivm(jt); | |
4510 | |
4511 // Don't wait if cannot get lock since interference arises from | |
4512 // unblocking. Also. check interrupt before trying wait | |
4513 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4514 return; | |
4515 } | |
4516 | |
4517 int status ; | |
4518 if (_counter > 0) { // no wait needed | |
4519 _counter = 0; | |
4520 status = pthread_mutex_unlock(_mutex); | |
4521 assert (status == 0, "invariant") ; | |
7629
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4522 // Paranoia to ensure our locked and lock-free paths interact |
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4523 // correctly with each other and Java-level accesses. |
3960 | 4524 OrderAccess::fence(); |
4525 return; | |
4526 } | |
4527 | |
4528 #ifdef ASSERT | |
4529 // Don't catch signals while blocked; let the running threads have the signals. | |
4530 // (This allows a debugger to break into the running thread.) | |
4531 sigset_t oldsigs; | |
4532 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
4533 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4534 #endif | |
4535 | |
4536 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
4537 jt->set_suspend_equivalent(); | |
4538 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
4539 | |
4540 if (time == 0) { | |
4541 status = pthread_cond_wait (_cond, _mutex) ; | |
4542 } else { | |
4543 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
4544 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4545 pthread_cond_destroy (_cond) ; | |
4546 pthread_cond_init (_cond, NULL); | |
4547 } | |
4548 } | |
4549 assert_status(status == 0 || status == EINTR || | |
4550 status == ETIMEDOUT, | |
4551 status, "cond_timedwait"); | |
4552 | |
4553 #ifdef ASSERT | |
4554 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
4555 #endif | |
4556 | |
4557 _counter = 0 ; | |
4558 status = pthread_mutex_unlock(_mutex) ; | |
4559 assert_status(status == 0, status, "invariant") ; | |
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4560 // Paranoia to ensure our locked and lock-free paths interact |
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4561 // correctly with each other and Java-level accesses. |
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4562 OrderAccess::fence(); |
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4563 |
3960 | 4564 // If externally suspended while waiting, re-suspend |
4565 if (jt->handle_special_suspend_equivalent_condition()) { | |
4566 jt->java_suspend_self(); | |
4567 } | |
4568 } | |
4569 | |
4570 void Parker::unpark() { | |
4571 int s, status ; | |
4572 status = pthread_mutex_lock(_mutex); | |
4573 assert (status == 0, "invariant") ; | |
4574 s = _counter; | |
4575 _counter = 1; | |
4576 if (s < 1) { | |
4577 if (WorkAroundNPTLTimedWaitHang) { | |
4578 status = pthread_cond_signal (_cond) ; | |
4579 assert (status == 0, "invariant") ; | |
4580 status = pthread_mutex_unlock(_mutex); | |
4581 assert (status == 0, "invariant") ; | |
4582 } else { | |
4583 status = pthread_mutex_unlock(_mutex); | |
4584 assert (status == 0, "invariant") ; | |
4585 status = pthread_cond_signal (_cond) ; | |
4586 assert (status == 0, "invariant") ; | |
4587 } | |
4588 } else { | |
4589 pthread_mutex_unlock(_mutex); | |
4590 assert (status == 0, "invariant") ; | |
4591 } | |
4592 } | |
4593 | |
4594 | |
4595 /* Darwin has no "environ" in a dynamic library. */ | |
4596 #ifdef __APPLE__ | |
4597 #include <crt_externs.h> | |
4598 #define environ (*_NSGetEnviron()) | |
4599 #else | |
4600 extern char** environ; | |
4601 #endif | |
4602 | |
4603 // Run the specified command in a separate process. Return its exit value, | |
4604 // or -1 on failure (e.g. can't fork a new process). | |
4605 // Unlike system(), this function can be called from signal handler. It | |
4606 // doesn't block SIGINT et al. | |
4607 int os::fork_and_exec(char* cmd) { | |
4608 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
4609 | |
4610 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
4611 // pthread_atfork handlers and reset pthread library. All we need is a | |
4612 // separate process to execve. Make a direct syscall to fork process. | |
4613 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
4614 // the best... | |
4615 pid_t pid = fork(); | |
4616 | |
4617 if (pid < 0) { | |
4618 // fork failed | |
4619 return -1; | |
4620 | |
4621 } else if (pid == 0) { | |
4622 // child process | |
4623 | |
4624 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
4625 // first to kill every thread on the thread list. Because this list is | |
4626 // not reset by fork() (see notes above), execve() will instead kill | |
4627 // every thread in the parent process. We know this is the only thread | |
4628 // in the new process, so make a system call directly. | |
4629 // IA64 should use normal execve() from glibc to match the glibc fork() | |
4630 // above. | |
4631 execve("/bin/sh", (char* const*)argv, environ); | |
4632 | |
4633 // execve failed | |
4634 _exit(-1); | |
4635 | |
4636 } else { | |
4637 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
4638 // care about the actual exit code, for now. | |
4639 | |
4640 int status; | |
4641 | |
4642 // Wait for the child process to exit. This returns immediately if | |
4643 // the child has already exited. */ | |
4644 while (waitpid(pid, &status, 0) < 0) { | |
4645 switch (errno) { | |
4646 case ECHILD: return 0; | |
4647 case EINTR: break; | |
4648 default: return -1; | |
4649 } | |
4650 } | |
4651 | |
4652 if (WIFEXITED(status)) { | |
4653 // The child exited normally; get its exit code. | |
4654 return WEXITSTATUS(status); | |
4655 } else if (WIFSIGNALED(status)) { | |
4656 // The child exited because of a signal | |
4657 // The best value to return is 0x80 + signal number, | |
4658 // because that is what all Unix shells do, and because | |
4659 // it allows callers to distinguish between process exit and | |
4660 // process death by signal. | |
4661 return 0x80 + WTERMSIG(status); | |
4662 } else { | |
4663 // Unknown exit code; pass it through | |
4664 return status; | |
4665 } | |
4666 } | |
4667 } | |
4668 | |
4669 // is_headless_jre() | |
4670 // | |
4082
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4671 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
3960 | 4672 // in order to report if we are running in a headless jre |
4673 // | |
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4674 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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4675 // as libawt.so, and renamed libawt_xawt.so |
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4676 // |
3960 | 4677 bool os::is_headless_jre() { |
4678 struct stat statbuf; | |
4679 char buf[MAXPATHLEN]; | |
4680 char libmawtpath[MAXPATHLEN]; | |
4006 | 4681 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
5921 | 4682 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
3960 | 4683 char *p; |
4684 | |
4685 // Get path to libjvm.so | |
4686 os::jvm_path(buf, sizeof(buf)); | |
4687 | |
4688 // Get rid of libjvm.so | |
4689 p = strrchr(buf, '/'); | |
4690 if (p == NULL) return false; | |
4691 else *p = '\0'; | |
4692 | |
4693 // Get rid of client or server | |
4694 p = strrchr(buf, '/'); | |
4695 if (p == NULL) return false; | |
4696 else *p = '\0'; | |
4697 | |
4698 // check xawt/libmawt.so | |
4699 strcpy(libmawtpath, buf); | |
4700 strcat(libmawtpath, xawtstr); | |
4701 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
4702 | |
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4703 // check libawt_xawt.so |
3960 | 4704 strcpy(libmawtpath, buf); |
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4705 strcat(libmawtpath, new_xawtstr); |
3960 | 4706 if (::stat(libmawtpath, &statbuf) == 0) return false; |
4707 | |
4708 return true; | |
4709 } | |
6200
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|
4710 |
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4711 // Get the default path to the core file |
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4712 // Returns the length of the string |
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4713 int os::get_core_path(char* buffer, size_t bufferSize) { |
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4714 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
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|
4715 |
65906dc96aa1
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|
4716 // Truncate if theoretical string was longer than bufferSize |
65906dc96aa1
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|
4717 n = MIN2(n, (int)bufferSize); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
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|
4718 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
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|
4719 return n; |
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|
4720 } |
10405 | 4721 |