Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 7629:22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
Summary: misc correctness fixes
Reviewed-by: acorn, dholmes, dice, sspitsyn
Contributed-by: dave.dice@oracle.com
author | dcubed |
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date | Tue, 22 Jan 2013 05:56:42 -0800 |
parents | c07c102cbad7 |
children | 3ac7d10a6572 758935f7c23f |
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" | |
60 #include "services/runtimeService.hpp" | |
61 #include "utilities/decoder.hpp" | |
62 #include "utilities/defaultStream.hpp" | |
63 #include "utilities/events.hpp" | |
64 #include "utilities/growableArray.hpp" | |
65 #include "utilities/vmError.hpp" | |
66 | |
67 // put OS-includes here | |
68 # include <sys/types.h> | |
69 # include <sys/mman.h> | |
70 # include <sys/stat.h> | |
71 # include <sys/select.h> | |
72 # include <pthread.h> | |
73 # include <signal.h> | |
74 # include <errno.h> | |
75 # include <dlfcn.h> | |
76 # include <stdio.h> | |
77 # include <unistd.h> | |
78 # include <sys/resource.h> | |
79 # include <pthread.h> | |
80 # include <sys/stat.h> | |
81 # include <sys/time.h> | |
82 # include <sys/times.h> | |
83 # include <sys/utsname.h> | |
84 # include <sys/socket.h> | |
85 # include <sys/wait.h> | |
86 # include <time.h> | |
87 # include <pwd.h> | |
88 # include <poll.h> | |
89 # include <semaphore.h> | |
90 # include <fcntl.h> | |
91 # include <string.h> | |
92 # include <sys/param.h> | |
93 # include <sys/sysctl.h> | |
94 # include <sys/ipc.h> | |
95 # include <sys/shm.h> | |
96 #ifndef __APPLE__ | |
97 # include <link.h> | |
98 #endif | |
99 # include <stdint.h> | |
100 # include <inttypes.h> | |
101 # include <sys/ioctl.h> | |
102 | |
103 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
104 # include <elf.h> | |
105 #endif | |
106 | |
107 #ifdef __APPLE__ | |
4006 | 108 # include <mach/mach.h> // semaphore_* API |
109 # include <mach-o/dyld.h> | |
110 # include <sys/proc_info.h> | |
111 # include <objc/objc-auto.h> | |
3960 | 112 #endif |
113 | |
114 #ifndef MAP_ANONYMOUS | |
115 #define MAP_ANONYMOUS MAP_ANON | |
116 #endif | |
117 | |
118 #define MAX_PATH (2 * K) | |
119 | |
120 // for timer info max values which include all bits | |
121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
122 | |
123 #define LARGEPAGES_BIT (1 << 6) | |
124 //////////////////////////////////////////////////////////////////////////////// | |
125 // global variables | |
126 julong os::Bsd::_physical_memory = 0; | |
127 | |
128 | |
129 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
130 pthread_t os::Bsd::_main_thread; | |
131 int os::Bsd::_page_size = -1; | |
132 | |
133 static jlong initial_time_count=0; | |
134 | |
135 static int clock_tics_per_sec = 100; | |
136 | |
137 // For diagnostics to print a message once. see run_periodic_checks | |
138 static sigset_t check_signal_done; | |
6918 | 139 static bool check_signals = true; |
3960 | 140 |
141 static pid_t _initial_pid = 0; | |
142 | |
143 /* Signal number used to suspend/resume a thread */ | |
144 | |
145 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
146 static int SR_signum = SIGUSR2; | |
147 sigset_t SR_sigset; | |
148 | |
149 | |
150 //////////////////////////////////////////////////////////////////////////////// | |
151 // utility functions | |
152 | |
153 static int SR_initialize(); | |
154 static int SR_finalize(); | |
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 julong os::allocatable_physical_memory(julong size) { | |
170 #ifdef _LP64 | |
171 return size; | |
172 #else | |
173 julong result = MIN2(size, (julong)3800*M); | |
174 if (!is_allocatable(result)) { | |
175 // See comments under solaris for alignment considerations | |
176 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); | |
177 result = MIN2(size, reasonable_size); | |
178 } | |
179 return result; | |
180 #endif // _LP64 | |
181 } | |
182 | |
183 //////////////////////////////////////////////////////////////////////////////// | |
184 // environment support | |
185 | |
186 bool os::getenv(const char* name, char* buf, int len) { | |
187 const char* val = ::getenv(name); | |
188 if (val != NULL && strlen(val) < (size_t)len) { | |
189 strcpy(buf, val); | |
190 return true; | |
191 } | |
192 if (len > 0) buf[0] = 0; // return a null string | |
193 return false; | |
194 } | |
195 | |
196 | |
197 // Return true if user is running as root. | |
198 | |
199 bool os::have_special_privileges() { | |
200 static bool init = false; | |
201 static bool privileges = false; | |
202 if (!init) { | |
203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
204 init = true; | |
205 } | |
206 return privileges; | |
207 } | |
208 | |
209 | |
210 | |
211 // Cpu architecture string | |
212 #if defined(ZERO) | |
213 static char cpu_arch[] = ZERO_LIBARCH; | |
214 #elif defined(IA64) | |
215 static char cpu_arch[] = "ia64"; | |
216 #elif defined(IA32) | |
217 static char cpu_arch[] = "i386"; | |
218 #elif defined(AMD64) | |
219 static char cpu_arch[] = "amd64"; | |
220 #elif defined(ARM) | |
221 static char cpu_arch[] = "arm"; | |
222 #elif defined(PPC) | |
223 static char cpu_arch[] = "ppc"; | |
224 #elif defined(SPARC) | |
225 # ifdef _LP64 | |
226 static char cpu_arch[] = "sparcv9"; | |
227 # else | |
228 static char cpu_arch[] = "sparc"; | |
229 # endif | |
230 #else | |
231 #error Add appropriate cpu_arch setting | |
232 #endif | |
233 | |
4846 | 234 // Compiler variant |
235 #ifdef COMPILER2 | |
236 #define COMPILER_VARIANT "server" | |
237 #else | |
238 #define COMPILER_VARIANT "client" | |
239 #endif | |
3960 | 240 |
6918 | 241 |
3960 | 242 void os::Bsd::initialize_system_info() { |
243 int mib[2]; | |
244 size_t len; | |
245 int cpu_val; | |
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246 julong mem_val; |
3960 | 247 |
248 /* get processors count via hw.ncpus sysctl */ | |
249 mib[0] = CTL_HW; | |
250 mib[1] = HW_NCPU; | |
251 len = sizeof(cpu_val); | |
252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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253 assert(len == sizeof(cpu_val), "unexpected data size"); |
3960 | 254 set_processor_count(cpu_val); |
255 } | |
256 else { | |
257 set_processor_count(1); // fallback | |
258 } | |
259 | |
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260 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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261 * since it returns a 64 bit value) |
3960 | 262 */ |
263 mib[0] = CTL_HW; | |
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264 mib[1] = HW_MEMSIZE; |
3960 | 265 len = sizeof(mem_val); |
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266 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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267 assert(len == sizeof(mem_val), "unexpected data size"); |
3960 | 268 _physical_memory = mem_val; |
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269 } else { |
3960 | 270 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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271 } |
3960 | 272 |
273 #ifdef __OpenBSD__ | |
274 { | |
275 // limit _physical_memory memory view on OpenBSD since | |
276 // datasize rlimit restricts us anyway. | |
277 struct rlimit limits; | |
278 getrlimit(RLIMIT_DATA, &limits); | |
279 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
280 } | |
281 #endif | |
282 } | |
283 | |
4006 | 284 #ifdef __APPLE__ |
285 static const char *get_home() { | |
286 const char *home_dir = ::getenv("HOME"); | |
287 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
288 struct passwd *passwd_info = getpwuid(geteuid()); | |
289 if (passwd_info != NULL) { | |
290 home_dir = passwd_info->pw_dir; | |
291 } | |
292 } | |
293 | |
294 return home_dir; | |
295 } | |
296 #endif | |
297 | |
3960 | 298 void os::init_system_properties_values() { |
299 // char arch[12]; | |
300 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
301 | |
302 // The next steps are taken in the product version: | |
303 // | |
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304 // Obtain the JAVA_HOME value from the location of libjvm.so. |
3960 | 305 // This library should be located at: |
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306 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
3960 | 307 // |
308 // If "/jre/lib/" appears at the right place in the path, then we | |
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309 // assume libjvm.so is installed in a JDK and we use this path. |
3960 | 310 // |
311 // Otherwise exit with message: "Could not create the Java virtual machine." | |
312 // | |
313 // The following extra steps are taken in the debugging version: | |
314 // | |
315 // If "/jre/lib/" does NOT appear at the right place in the path | |
316 // instead of exit check for $JAVA_HOME environment variable. | |
317 // | |
318 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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319 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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320 // it looks like libjvm.so is installed there |
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321 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
3960 | 322 // |
323 // Otherwise exit. | |
324 // | |
325 // Important note: if the location of libjvm.so changes this | |
326 // code needs to be changed accordingly. | |
327 | |
328 // The next few definitions allow the code to be verbatim: | |
6197 | 329 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
3960 | 330 #define getenv(n) ::getenv(n) |
331 | |
332 /* | |
333 * See ld(1): | |
334 * The linker uses the following search paths to locate required | |
335 * shared libraries: | |
336 * 1: ... | |
337 * ... | |
338 * 7: The default directories, normally /lib and /usr/lib. | |
339 */ | |
340 #ifndef DEFAULT_LIBPATH | |
341 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
342 #endif | |
343 | |
344 #define EXTENSIONS_DIR "/lib/ext" | |
345 #define ENDORSED_DIR "/lib/endorsed" | |
346 #define REG_DIR "/usr/java/packages" | |
347 | |
4006 | 348 #ifdef __APPLE__ |
349 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
350 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
351 const char *user_home_dir = get_home(); | |
352 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
353 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
354 sizeof(SYS_EXTENSIONS_DIRS); | |
355 #endif | |
356 | |
3960 | 357 { |
358 /* sysclasspath, java_home, dll_dir */ | |
359 { | |
360 char *home_path; | |
361 char *dll_path; | |
362 char *pslash; | |
363 char buf[MAXPATHLEN]; | |
364 os::jvm_path(buf, sizeof(buf)); | |
365 | |
366 // Found the full path to libjvm.so. | |
367 // Now cut the path to <java_home>/jre if we can. | |
368 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
369 pslash = strrchr(buf, '/'); | |
370 if (pslash != NULL) | |
371 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
372 dll_path = malloc(strlen(buf) + 1); | |
373 if (dll_path == NULL) | |
374 return; | |
375 strcpy(dll_path, buf); | |
376 Arguments::set_dll_dir(dll_path); | |
377 | |
378 if (pslash != NULL) { | |
379 pslash = strrchr(buf, '/'); | |
380 if (pslash != NULL) { | |
4006 | 381 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
382 #ifndef __APPLE__ | |
3960 | 383 pslash = strrchr(buf, '/'); |
384 if (pslash != NULL) | |
385 *pslash = '\0'; /* get rid of /lib */ | |
4006 | 386 #endif |
3960 | 387 } |
388 } | |
389 | |
390 home_path = malloc(strlen(buf) + 1); | |
391 if (home_path == NULL) | |
392 return; | |
393 strcpy(home_path, buf); | |
394 Arguments::set_java_home(home_path); | |
395 | |
396 if (!set_boot_path('/', ':')) | |
397 return; | |
398 } | |
399 | |
400 /* | |
401 * Where to look for native libraries | |
402 * | |
403 * Note: Due to a legacy implementation, most of the library path | |
404 * is set in the launcher. This was to accomodate linking restrictions | |
405 * on legacy Bsd implementations (which are no longer supported). | |
406 * Eventually, all the library path setting will be done here. | |
407 * | |
408 * However, to prevent the proliferation of improperly built native | |
409 * libraries, the new path component /usr/java/packages is added here. | |
410 * Eventually, all the library path setting will be done here. | |
411 */ | |
412 { | |
413 char *ld_library_path; | |
414 | |
415 /* | |
416 * Construct the invariant part of ld_library_path. Note that the | |
417 * space for the colon and the trailing null are provided by the | |
418 * nulls included by the sizeof operator (so actually we allocate | |
419 * a byte more than necessary). | |
420 */ | |
4006 | 421 #ifdef __APPLE__ |
422 ld_library_path = (char *) malloc(system_ext_size); | |
423 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
424 #else | |
3960 | 425 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
426 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
427 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
4006 | 428 #endif |
3960 | 429 |
430 /* | |
431 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
432 * should always exist (until the legacy problem cited above is | |
433 * addressed). | |
434 */ | |
435 #ifdef __APPLE__ | |
4006 | 436 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
437 char *l = getenv("JAVA_LIBRARY_PATH"); | |
438 if (l != NULL) { | |
439 char *t = ld_library_path; | |
440 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
441 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
442 sprintf(ld_library_path, "%s:%s", l, t); | |
443 free(t); | |
444 } | |
445 | |
3960 | 446 char *v = getenv("DYLD_LIBRARY_PATH"); |
447 #else | |
448 char *v = getenv("LD_LIBRARY_PATH"); | |
449 #endif | |
450 if (v != NULL) { | |
451 char *t = ld_library_path; | |
452 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
453 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
454 sprintf(ld_library_path, "%s:%s", v, t); | |
4006 | 455 free(t); |
3960 | 456 } |
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457 |
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458 #ifdef __APPLE__ |
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459 // Apple's Java6 has "." at the beginning of java.library.path. |
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460 // OpenJDK on Windows has "." at the end of java.library.path. |
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461 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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462 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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463 // "." is appended to the end of java.library.path. Yes, this |
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464 // could cause a change in behavior, but Apple's Java6 behavior |
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465 // can be achieved by putting "." at the beginning of the |
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466 // JAVA_LIBRARY_PATH environment variable. |
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467 { |
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468 char *t = ld_library_path; |
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469 // that's +3 for appending ":." and the trailing '\0' |
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470 ld_library_path = (char *) malloc(strlen(t) + 3); |
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471 sprintf(ld_library_path, "%s:%s", t, "."); |
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472 free(t); |
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473 } |
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474 #endif |
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475 |
3960 | 476 Arguments::set_library_path(ld_library_path); |
477 } | |
478 | |
479 /* | |
480 * Extensions directories. | |
481 * | |
482 * Note that the space for the colon and the trailing null are provided | |
483 * by the nulls included by the sizeof operator (so actually one byte more | |
484 * than necessary is allocated). | |
485 */ | |
486 { | |
4006 | 487 #ifdef __APPLE__ |
488 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
489 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
490 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
491 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
492 #else | |
3960 | 493 char *buf = malloc(strlen(Arguments::get_java_home()) + |
494 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
495 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
496 Arguments::get_java_home()); | |
4006 | 497 #endif |
498 | |
3960 | 499 Arguments::set_ext_dirs(buf); |
500 } | |
501 | |
502 /* Endorsed standards default directory. */ | |
503 { | |
504 char * buf; | |
505 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
506 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
507 Arguments::set_endorsed_dirs(buf); | |
508 } | |
509 } | |
510 | |
4006 | 511 #ifdef __APPLE__ |
512 #undef SYS_EXTENSIONS_DIR | |
513 #endif | |
3960 | 514 #undef malloc |
515 #undef getenv | |
516 #undef EXTENSIONS_DIR | |
517 #undef ENDORSED_DIR | |
518 | |
519 // Done | |
520 return; | |
521 } | |
522 | |
523 //////////////////////////////////////////////////////////////////////////////// | |
524 // breakpoint support | |
525 | |
526 void os::breakpoint() { | |
527 BREAKPOINT; | |
528 } | |
529 | |
530 extern "C" void breakpoint() { | |
531 // use debugger to set breakpoint here | |
532 } | |
533 | |
534 //////////////////////////////////////////////////////////////////////////////// | |
535 // signal support | |
536 | |
537 debug_only(static bool signal_sets_initialized = false); | |
538 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
539 | |
540 bool os::Bsd::is_sig_ignored(int sig) { | |
541 struct sigaction oact; | |
542 sigaction(sig, (struct sigaction*)NULL, &oact); | |
543 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
544 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
545 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
546 return true; | |
547 else | |
548 return false; | |
549 } | |
550 | |
551 void os::Bsd::signal_sets_init() { | |
552 // Should also have an assertion stating we are still single-threaded. | |
553 assert(!signal_sets_initialized, "Already initialized"); | |
554 // Fill in signals that are necessarily unblocked for all threads in | |
555 // the VM. Currently, we unblock the following signals: | |
556 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
557 // by -Xrs (=ReduceSignalUsage)); | |
558 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
559 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
560 // the dispositions or masks wrt these signals. | |
561 // Programs embedding the VM that want to use the above signals for their | |
562 // own purposes must, at this time, use the "-Xrs" option to prevent | |
563 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
564 // (See bug 4345157, and other related bugs). | |
565 // In reality, though, unblocking these signals is really a nop, since | |
566 // these signals are not blocked by default. | |
567 sigemptyset(&unblocked_sigs); | |
568 sigemptyset(&allowdebug_blocked_sigs); | |
569 sigaddset(&unblocked_sigs, SIGILL); | |
570 sigaddset(&unblocked_sigs, SIGSEGV); | |
571 sigaddset(&unblocked_sigs, SIGBUS); | |
572 sigaddset(&unblocked_sigs, SIGFPE); | |
573 sigaddset(&unblocked_sigs, SR_signum); | |
574 | |
575 if (!ReduceSignalUsage) { | |
576 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
577 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
578 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
579 } | |
580 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
581 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
582 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
583 } | |
584 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
585 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
586 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
587 } | |
588 } | |
589 // Fill in signals that are blocked by all but the VM thread. | |
590 sigemptyset(&vm_sigs); | |
591 if (!ReduceSignalUsage) | |
592 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
593 debug_only(signal_sets_initialized = true); | |
594 | |
595 } | |
596 | |
597 // These are signals that are unblocked while a thread is running Java. | |
598 // (For some reason, they get blocked by default.) | |
599 sigset_t* os::Bsd::unblocked_signals() { | |
600 assert(signal_sets_initialized, "Not initialized"); | |
601 return &unblocked_sigs; | |
602 } | |
603 | |
604 // These are the signals that are blocked while a (non-VM) thread is | |
605 // running Java. Only the VM thread handles these signals. | |
606 sigset_t* os::Bsd::vm_signals() { | |
607 assert(signal_sets_initialized, "Not initialized"); | |
608 return &vm_sigs; | |
609 } | |
610 | |
611 // These are signals that are blocked during cond_wait to allow debugger in | |
612 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
613 assert(signal_sets_initialized, "Not initialized"); | |
614 return &allowdebug_blocked_sigs; | |
615 } | |
616 | |
617 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
618 | |
619 //Save caller's signal mask before setting VM signal mask | |
620 sigset_t caller_sigmask; | |
621 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
622 | |
623 OSThread* osthread = thread->osthread(); | |
624 osthread->set_caller_sigmask(caller_sigmask); | |
625 | |
626 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
627 | |
628 if (!ReduceSignalUsage) { | |
629 if (thread->is_VM_thread()) { | |
630 // Only the VM thread handles BREAK_SIGNAL ... | |
631 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
632 } else { | |
633 // ... all other threads block BREAK_SIGNAL | |
634 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
635 } | |
636 } | |
637 } | |
638 | |
639 | |
640 ////////////////////////////////////////////////////////////////////////////// | |
641 // create new thread | |
642 | |
643 static address highest_vm_reserved_address(); | |
644 | |
645 // check if it's safe to start a new thread | |
646 static bool _thread_safety_check(Thread* thread) { | |
6918 | 647 return true; |
3960 | 648 } |
649 | |
4006 | 650 #ifdef __APPLE__ |
651 // library handle for calling objc_registerThreadWithCollector() | |
652 // without static linking to the libobjc library | |
653 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
654 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
655 typedef void (*objc_registerThreadWithCollector_t)(); | |
656 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
657 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
658 #endif | |
659 | |
3960 | 660 // Thread start routine for all newly created threads |
661 static void *java_start(Thread *thread) { | |
662 // Try to randomize the cache line index of hot stack frames. | |
663 // This helps when threads of the same stack traces evict each other's | |
664 // cache lines. The threads can be either from the same JVM instance, or | |
665 // from different JVM instances. The benefit is especially true for | |
666 // processors with hyperthreading technology. | |
667 static int counter = 0; | |
668 int pid = os::current_process_id(); | |
669 alloca(((pid ^ counter++) & 7) * 128); | |
670 | |
671 ThreadLocalStorage::set_thread(thread); | |
672 | |
673 OSThread* osthread = thread->osthread(); | |
674 Monitor* sync = osthread->startThread_lock(); | |
675 | |
676 // non floating stack BsdThreads needs extra check, see above | |
677 if (!_thread_safety_check(thread)) { | |
678 // notify parent thread | |
679 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
680 osthread->set_state(ZOMBIE); | |
681 sync->notify_all(); | |
682 return NULL; | |
683 } | |
684 | |
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685 #ifdef __APPLE__ |
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686 // thread_id is mach thread on macos |
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687 osthread->set_thread_id(::mach_thread_self()); |
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688 #else |
3960 | 689 // thread_id is pthread_id on BSD |
690 osthread->set_thread_id(::pthread_self()); | |
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691 #endif |
3960 | 692 // initialize signal mask for this thread |
693 os::Bsd::hotspot_sigmask(thread); | |
694 | |
695 // initialize floating point control register | |
696 os::Bsd::init_thread_fpu_state(); | |
697 | |
4006 | 698 #ifdef __APPLE__ |
699 // register thread with objc gc | |
700 if (objc_registerThreadWithCollectorFunction != NULL) { | |
701 objc_registerThreadWithCollectorFunction(); | |
702 } | |
703 #endif | |
704 | |
3960 | 705 // handshaking with parent thread |
706 { | |
707 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
708 | |
709 // notify parent thread | |
710 osthread->set_state(INITIALIZED); | |
711 sync->notify_all(); | |
712 | |
713 // wait until os::start_thread() | |
714 while (osthread->get_state() == INITIALIZED) { | |
715 sync->wait(Mutex::_no_safepoint_check_flag); | |
716 } | |
717 } | |
718 | |
719 // call one more level start routine | |
720 thread->run(); | |
721 | |
722 return 0; | |
723 } | |
724 | |
725 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
726 assert(thread->osthread() == NULL, "caller responsible"); | |
727 | |
728 // Allocate the OSThread object | |
729 OSThread* osthread = new OSThread(NULL, NULL); | |
730 if (osthread == NULL) { | |
731 return false; | |
732 } | |
733 | |
734 // set the correct thread state | |
735 osthread->set_thread_type(thr_type); | |
736 | |
737 // Initial state is ALLOCATED but not INITIALIZED | |
738 osthread->set_state(ALLOCATED); | |
739 | |
740 thread->set_osthread(osthread); | |
741 | |
742 // init thread attributes | |
743 pthread_attr_t attr; | |
744 pthread_attr_init(&attr); | |
745 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
746 | |
747 // stack size | |
748 if (os::Bsd::supports_variable_stack_size()) { | |
749 // calculate stack size if it's not specified by caller | |
750 if (stack_size == 0) { | |
751 stack_size = os::Bsd::default_stack_size(thr_type); | |
752 | |
753 switch (thr_type) { | |
754 case os::java_thread: | |
755 // Java threads use ThreadStackSize which default value can be | |
756 // changed with the flag -Xss | |
757 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
758 stack_size = JavaThread::stack_size_at_create(); | |
759 break; | |
760 case os::compiler_thread: | |
761 if (CompilerThreadStackSize > 0) { | |
762 stack_size = (size_t)(CompilerThreadStackSize * K); | |
763 break; | |
764 } // else fall through: | |
765 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
766 case os::vm_thread: | |
767 case os::pgc_thread: | |
768 case os::cgc_thread: | |
769 case os::watcher_thread: | |
770 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
771 break; | |
772 } | |
773 } | |
774 | |
775 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
776 pthread_attr_setstacksize(&attr, stack_size); | |
777 } else { | |
778 // let pthread_create() pick the default value. | |
779 } | |
780 | |
781 ThreadState state; | |
782 | |
783 { | |
784 pthread_t tid; | |
785 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
786 | |
787 pthread_attr_destroy(&attr); | |
788 | |
789 if (ret != 0) { | |
790 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
791 perror("pthread_create()"); | |
792 } | |
793 // Need to clean up stuff we've allocated so far | |
794 thread->set_osthread(NULL); | |
795 delete osthread; | |
796 return false; | |
797 } | |
798 | |
799 // Store pthread info into the OSThread | |
800 osthread->set_pthread_id(tid); | |
801 | |
802 // Wait until child thread is either initialized or aborted | |
803 { | |
804 Monitor* sync_with_child = osthread->startThread_lock(); | |
805 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
806 while ((state = osthread->get_state()) == ALLOCATED) { | |
807 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
808 } | |
809 } | |
810 | |
811 } | |
812 | |
813 // Aborted due to thread limit being reached | |
814 if (state == ZOMBIE) { | |
815 thread->set_osthread(NULL); | |
816 delete osthread; | |
817 return false; | |
818 } | |
819 | |
820 // The thread is returned suspended (in state INITIALIZED), | |
821 // and is started higher up in the call chain | |
822 assert(state == INITIALIZED, "race condition"); | |
823 return true; | |
824 } | |
825 | |
826 ///////////////////////////////////////////////////////////////////////////// | |
827 // attach existing thread | |
828 | |
829 // bootstrap the main thread | |
830 bool os::create_main_thread(JavaThread* thread) { | |
831 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
832 return create_attached_thread(thread); | |
833 } | |
834 | |
835 bool os::create_attached_thread(JavaThread* thread) { | |
836 #ifdef ASSERT | |
837 thread->verify_not_published(); | |
838 #endif | |
839 | |
840 // Allocate the OSThread object | |
841 OSThread* osthread = new OSThread(NULL, NULL); | |
842 | |
843 if (osthread == NULL) { | |
844 return false; | |
845 } | |
846 | |
847 // Store pthread info into the OSThread | |
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848 #ifdef __APPLE__ |
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849 osthread->set_thread_id(::mach_thread_self()); |
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850 #else |
3960 | 851 osthread->set_thread_id(::pthread_self()); |
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852 #endif |
3960 | 853 osthread->set_pthread_id(::pthread_self()); |
854 | |
855 // initialize floating point control register | |
856 os::Bsd::init_thread_fpu_state(); | |
857 | |
858 // Initial thread state is RUNNABLE | |
859 osthread->set_state(RUNNABLE); | |
860 | |
861 thread->set_osthread(osthread); | |
862 | |
863 // initialize signal mask for this thread | |
864 // and save the caller's signal mask | |
865 os::Bsd::hotspot_sigmask(thread); | |
866 | |
867 return true; | |
868 } | |
869 | |
870 void os::pd_start_thread(Thread* thread) { | |
871 OSThread * osthread = thread->osthread(); | |
872 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
873 Monitor* sync_with_child = osthread->startThread_lock(); | |
874 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
875 sync_with_child->notify(); | |
876 } | |
877 | |
878 // Free Bsd resources related to the OSThread | |
879 void os::free_thread(OSThread* osthread) { | |
880 assert(osthread != NULL, "osthread not set"); | |
881 | |
882 if (Thread::current()->osthread() == osthread) { | |
883 // Restore caller's signal mask | |
884 sigset_t sigmask = osthread->caller_sigmask(); | |
885 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
886 } | |
887 | |
888 delete osthread; | |
889 } | |
890 | |
891 ////////////////////////////////////////////////////////////////////////////// | |
892 // thread local storage | |
893 | |
894 int os::allocate_thread_local_storage() { | |
895 pthread_key_t key; | |
896 int rslt = pthread_key_create(&key, NULL); | |
897 assert(rslt == 0, "cannot allocate thread local storage"); | |
898 return (int)key; | |
899 } | |
900 | |
901 // Note: This is currently not used by VM, as we don't destroy TLS key | |
902 // on VM exit. | |
903 void os::free_thread_local_storage(int index) { | |
904 int rslt = pthread_key_delete((pthread_key_t)index); | |
905 assert(rslt == 0, "invalid index"); | |
906 } | |
907 | |
908 void os::thread_local_storage_at_put(int index, void* value) { | |
909 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
910 assert(rslt == 0, "pthread_setspecific failed"); | |
911 } | |
912 | |
913 extern "C" Thread* get_thread() { | |
914 return ThreadLocalStorage::thread(); | |
915 } | |
916 | |
917 | |
918 //////////////////////////////////////////////////////////////////////////////// | |
919 // time support | |
920 | |
921 // Time since start-up in seconds to a fine granularity. | |
922 // Used by VMSelfDestructTimer and the MemProfiler. | |
923 double os::elapsedTime() { | |
924 | |
925 return (double)(os::elapsed_counter()) * 0.000001; | |
926 } | |
927 | |
928 jlong os::elapsed_counter() { | |
929 timeval time; | |
930 int status = gettimeofday(&time, NULL); | |
931 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
932 } | |
933 | |
934 jlong os::elapsed_frequency() { | |
935 return (1000 * 1000); | |
936 } | |
937 | |
938 // XXX: For now, code this as if BSD does not support vtime. | |
939 bool os::supports_vtime() { return false; } | |
940 bool os::enable_vtime() { return false; } | |
941 bool os::vtime_enabled() { return false; } | |
942 double os::elapsedVTime() { | |
943 // better than nothing, but not much | |
944 return elapsedTime(); | |
945 } | |
946 | |
947 jlong os::javaTimeMillis() { | |
948 timeval time; | |
949 int status = gettimeofday(&time, NULL); | |
950 assert(status != -1, "bsd error"); | |
951 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
952 } | |
953 | |
954 #ifndef CLOCK_MONOTONIC | |
955 #define CLOCK_MONOTONIC (1) | |
956 #endif | |
957 | |
958 #ifdef __APPLE__ | |
959 void os::Bsd::clock_init() { | |
960 // XXXDARWIN: Investigate replacement monotonic clock | |
961 } | |
6918 | 962 #else |
3960 | 963 void os::Bsd::clock_init() { |
964 struct timespec res; | |
965 struct timespec tp; | |
966 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
967 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
968 // yes, monotonic clock is supported | |
969 _clock_gettime = ::clock_gettime; | |
970 } | |
971 } | |
972 #endif | |
973 | |
974 | |
975 jlong os::javaTimeNanos() { | |
976 if (Bsd::supports_monotonic_clock()) { | |
977 struct timespec tp; | |
978 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
979 assert(status == 0, "gettime error"); | |
980 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
981 return result; | |
982 } else { | |
983 timeval time; | |
984 int status = gettimeofday(&time, NULL); | |
985 assert(status != -1, "bsd error"); | |
986 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
987 return 1000 * usecs; | |
988 } | |
989 } | |
990 | |
991 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
992 if (Bsd::supports_monotonic_clock()) { | |
993 info_ptr->max_value = ALL_64_BITS; | |
994 | |
995 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
996 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
997 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
998 } else { | |
999 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1000 info_ptr->max_value = ALL_64_BITS; | |
1001 | |
1002 // gettimeofday is a real time clock so it skips | |
1003 info_ptr->may_skip_backward = true; | |
1004 info_ptr->may_skip_forward = true; | |
1005 } | |
1006 | |
1007 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1008 } | |
1009 | |
1010 // Return the real, user, and system times in seconds from an | |
1011 // arbitrary fixed point in the past. | |
1012 bool os::getTimesSecs(double* process_real_time, | |
1013 double* process_user_time, | |
1014 double* process_system_time) { | |
1015 struct tms ticks; | |
1016 clock_t real_ticks = times(&ticks); | |
1017 | |
1018 if (real_ticks == (clock_t) (-1)) { | |
1019 return false; | |
1020 } else { | |
1021 double ticks_per_second = (double) clock_tics_per_sec; | |
1022 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1023 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1024 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1025 | |
1026 return true; | |
1027 } | |
1028 } | |
1029 | |
1030 | |
1031 char * os::local_time_string(char *buf, size_t buflen) { | |
1032 struct tm t; | |
1033 time_t long_time; | |
1034 time(&long_time); | |
1035 localtime_r(&long_time, &t); | |
1036 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1037 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1038 t.tm_hour, t.tm_min, t.tm_sec); | |
1039 return buf; | |
1040 } | |
1041 | |
1042 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1043 return localtime_r(clock, res); | |
1044 } | |
1045 | |
1046 //////////////////////////////////////////////////////////////////////////////// | |
1047 // runtime exit support | |
1048 | |
1049 // Note: os::shutdown() might be called very early during initialization, or | |
1050 // called from signal handler. Before adding something to os::shutdown(), make | |
1051 // sure it is async-safe and can handle partially initialized VM. | |
1052 void os::shutdown() { | |
1053 | |
1054 // allow PerfMemory to attempt cleanup of any persistent resources | |
1055 perfMemory_exit(); | |
1056 | |
1057 // needs to remove object in file system | |
1058 AttachListener::abort(); | |
1059 | |
1060 // flush buffered output, finish log files | |
1061 ostream_abort(); | |
1062 | |
1063 // Check for abort hook | |
1064 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1065 if (abort_hook != NULL) { | |
1066 abort_hook(); | |
1067 } | |
1068 | |
1069 } | |
1070 | |
1071 // Note: os::abort() might be called very early during initialization, or | |
1072 // called from signal handler. Before adding something to os::abort(), make | |
1073 // sure it is async-safe and can handle partially initialized VM. | |
1074 void os::abort(bool dump_core) { | |
1075 os::shutdown(); | |
1076 if (dump_core) { | |
1077 #ifndef PRODUCT | |
1078 fdStream out(defaultStream::output_fd()); | |
1079 out.print_raw("Current thread is "); | |
1080 char buf[16]; | |
1081 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1082 out.print_raw_cr(buf); | |
1083 out.print_raw_cr("Dumping core ..."); | |
1084 #endif | |
1085 ::abort(); // dump core | |
1086 } | |
1087 | |
1088 ::exit(1); | |
1089 } | |
1090 | |
1091 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1092 void os::die() { | |
1093 // _exit() on BsdThreads only kills current thread | |
1094 ::abort(); | |
1095 } | |
1096 | |
1097 // unused on bsd for now. | |
1098 void os::set_error_file(const char *logfile) {} | |
1099 | |
1100 | |
1101 // This method is a copy of JDK's sysGetLastErrorString | |
1102 // from src/solaris/hpi/src/system_md.c | |
1103 | |
1104 size_t os::lasterror(char *buf, size_t len) { | |
1105 | |
1106 if (errno == 0) return 0; | |
1107 | |
1108 const char *s = ::strerror(errno); | |
1109 size_t n = ::strlen(s); | |
1110 if (n >= len) { | |
1111 n = len - 1; | |
1112 } | |
1113 ::strncpy(buf, s, n); | |
1114 buf[n] = '\0'; | |
1115 return n; | |
1116 } | |
1117 | |
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1118 intx os::current_thread_id() { |
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1119 #ifdef __APPLE__ |
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1120 return (intx)::mach_thread_self(); |
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1121 #else |
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1122 return (intx)::pthread_self(); |
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1123 #endif |
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1124 } |
3960 | 1125 int os::current_process_id() { |
1126 | |
1127 // Under the old bsd thread library, bsd gives each thread | |
1128 // its own process id. Because of this each thread will return | |
1129 // a different pid if this method were to return the result | |
1130 // of getpid(2). Bsd provides no api that returns the pid | |
1131 // of the launcher thread for the vm. This implementation | |
1132 // returns a unique pid, the pid of the launcher thread | |
1133 // that starts the vm 'process'. | |
1134 | |
1135 // Under the NPTL, getpid() returns the same pid as the | |
1136 // launcher thread rather than a unique pid per thread. | |
1137 // Use gettid() if you want the old pre NPTL behaviour. | |
1138 | |
1139 // if you are looking for the result of a call to getpid() that | |
1140 // returns a unique pid for the calling thread, then look at the | |
1141 // OSThread::thread_id() method in osThread_bsd.hpp file | |
1142 | |
1143 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1144 } | |
1145 | |
1146 // DLL functions | |
1147 | |
1148 #define JNI_LIB_PREFIX "lib" | |
1149 #ifdef __APPLE__ | |
1150 #define JNI_LIB_SUFFIX ".dylib" | |
1151 #else | |
1152 #define JNI_LIB_SUFFIX ".so" | |
1153 #endif | |
1154 | |
1155 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
1156 | |
1157 // This must be hard coded because it's the system's temporary | |
1158 // directory not the java application's temp directory, ala java.io.tmpdir. | |
4006 | 1159 #ifdef __APPLE__ |
1160 // macosx has a secure per-user temporary directory | |
1161 char temp_path_storage[PATH_MAX]; | |
1162 const char* os::get_temp_directory() { | |
1163 static char *temp_path = NULL; | |
1164 if (temp_path == NULL) { | |
1165 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
1166 if (pathSize == 0 || pathSize > PATH_MAX) { | |
1167 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
1168 } | |
1169 temp_path = temp_path_storage; | |
1170 } | |
1171 return temp_path; | |
1172 } | |
1173 #else /* __APPLE__ */ | |
3960 | 1174 const char* os::get_temp_directory() { return "/tmp"; } |
4006 | 1175 #endif /* __APPLE__ */ |
3960 | 1176 |
1177 static bool file_exists(const char* filename) { | |
1178 struct stat statbuf; | |
1179 if (filename == NULL || strlen(filename) == 0) { | |
1180 return false; | |
1181 } | |
1182 return os::stat(filename, &statbuf) == 0; | |
1183 } | |
1184 | |
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1185 bool os::dll_build_name(char* buffer, size_t buflen, |
3960 | 1186 const char* pname, const char* fname) { |
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1187 bool retval = false; |
3960 | 1188 // Copied from libhpi |
1189 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1190 | |
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1191 // Return error on buffer overflow. |
3960 | 1192 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1193 return retval; |
3960 | 1194 } |
1195 | |
1196 if (pnamelen == 0) { | |
1197 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1198 retval = true; |
3960 | 1199 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1200 int n; | |
1201 char** pelements = split_path(pname, &n); | |
1202 for (int i = 0 ; i < n ; i++) { | |
1203 // Really shouldn't be NULL, but check can't hurt | |
1204 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1205 continue; // skip the empty path values | |
1206 } | |
1207 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
1208 pelements[i], fname); | |
1209 if (file_exists(buffer)) { | |
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1210 retval = true; |
3960 | 1211 break; |
1212 } | |
1213 } | |
1214 // release the storage | |
1215 for (int i = 0 ; i < n ; i++) { | |
1216 if (pelements[i] != NULL) { | |
6197 | 1217 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
3960 | 1218 } |
1219 } | |
1220 if (pelements != NULL) { | |
6197 | 1221 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
3960 | 1222 } |
1223 } else { | |
1224 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1225 retval = true; |
3960 | 1226 } |
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1227 return retval; |
3960 | 1228 } |
1229 | |
1230 const char* os::get_current_directory(char *buf, int buflen) { | |
1231 return getcwd(buf, buflen); | |
1232 } | |
1233 | |
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1234 // check if addr is inside libjvm.so |
3960 | 1235 bool os::address_is_in_vm(address addr) { |
1236 static address libjvm_base_addr; | |
1237 Dl_info dlinfo; | |
1238 | |
1239 if (libjvm_base_addr == NULL) { | |
1240 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
1241 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
1242 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
1243 } | |
1244 | |
1245 if (dladdr((void *)addr, &dlinfo)) { | |
1246 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
1247 } | |
1248 | |
1249 return false; | |
1250 } | |
1251 | |
6258 | 1252 |
1253 #define MACH_MAXSYMLEN 256 | |
1254 | |
3960 | 1255 bool os::dll_address_to_function_name(address addr, char *buf, |
1256 int buflen, int *offset) { | |
1257 Dl_info dlinfo; | |
6258 | 1258 char localbuf[MACH_MAXSYMLEN]; |
1259 | |
1260 // dladdr will find names of dynamic functions only, but does | |
1261 // it set dli_fbase with mach_header address when it "fails" ? | |
3960 | 1262 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
1263 if (buf != NULL) { | |
1264 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
1265 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
1266 } | |
1267 } | |
1268 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
1269 return true; | |
1270 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
1271 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
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1272 buf, buflen, offset, dlinfo.dli_fname)) { |
3960 | 1273 return true; |
1274 } | |
1275 } | |
1276 | |
6258 | 1277 // Handle non-dymanic manually: |
1278 if (dlinfo.dli_fbase != NULL && | |
1279 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
1280 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
1281 jio_snprintf(buf, buflen, "%s", localbuf); | |
1282 } | |
1283 return true; | |
1284 } | |
3960 | 1285 if (buf != NULL) buf[0] = '\0'; |
1286 if (offset != NULL) *offset = -1; | |
1287 return false; | |
1288 } | |
1289 | |
1290 // ported from solaris version | |
1291 bool os::dll_address_to_library_name(address addr, char* buf, | |
1292 int buflen, int* offset) { | |
1293 Dl_info dlinfo; | |
1294 | |
1295 if (dladdr((void*)addr, &dlinfo)){ | |
1296 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
1297 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
1298 return true; | |
1299 } else { | |
1300 if (buf) buf[0] = '\0'; | |
1301 if (offset) *offset = -1; | |
1302 return false; | |
1303 } | |
1304 } | |
6918 | 1305 |
1306 // Loads .dll/.so and | |
1307 // in case of error it checks if .dll/.so was built for the | |
1308 // same architecture as Hotspot is running on | |
3960 | 1309 |
1310 #ifdef __APPLE__ | |
1311 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1312 void * result= ::dlopen(filename, RTLD_LAZY); | |
1313 if (result != NULL) { | |
1314 // Successful loading | |
1315 return result; | |
1316 } | |
1317 | |
1318 // Read system error message into ebuf | |
1319 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1320 ebuf[ebuflen-1]='\0'; | |
1321 | |
1322 return NULL; | |
1323 } | |
1324 #else | |
1325 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1326 { | |
1327 void * result= ::dlopen(filename, RTLD_LAZY); | |
1328 if (result != NULL) { | |
1329 // Successful loading | |
1330 return result; | |
1331 } | |
1332 | |
1333 Elf32_Ehdr elf_head; | |
1334 | |
1335 // Read system error message into ebuf | |
1336 // It may or may not be overwritten below | |
1337 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1338 ebuf[ebuflen-1]='\0'; | |
1339 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1340 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1341 | |
1342 if (diag_msg_max_length==0) { | |
1343 // No more space in ebuf for additional diagnostics message | |
1344 return NULL; | |
1345 } | |
1346 | |
1347 | |
1348 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1349 | |
1350 if (file_descriptor < 0) { | |
1351 // Can't open library, report dlerror() message | |
1352 return NULL; | |
1353 } | |
1354 | |
1355 bool failed_to_read_elf_head= | |
1356 (sizeof(elf_head)!= | |
1357 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1358 | |
1359 ::close(file_descriptor); | |
1360 if (failed_to_read_elf_head) { | |
1361 // file i/o error - report dlerror() msg | |
1362 return NULL; | |
1363 } | |
1364 | |
1365 typedef struct { | |
1366 Elf32_Half code; // Actual value as defined in elf.h | |
1367 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1368 char elf_class; // 32 or 64 bit | |
1369 char endianess; // MSB or LSB | |
1370 char* name; // String representation | |
1371 } arch_t; | |
1372 | |
1373 #ifndef EM_486 | |
1374 #define EM_486 6 /* Intel 80486 */ | |
1375 #endif | |
1376 | |
1377 #ifndef EM_MIPS_RS3_LE | |
1378 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
1379 #endif | |
1380 | |
1381 #ifndef EM_PPC64 | |
1382 #define EM_PPC64 21 /* PowerPC64 */ | |
1383 #endif | |
1384 | |
1385 #ifndef EM_S390 | |
1386 #define EM_S390 22 /* IBM System/390 */ | |
1387 #endif | |
1388 | |
1389 #ifndef EM_IA_64 | |
1390 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
1391 #endif | |
1392 | |
1393 #ifndef EM_X86_64 | |
1394 #define EM_X86_64 62 /* AMD x86-64 */ | |
1395 #endif | |
1396 | |
1397 static const arch_t arch_array[]={ | |
1398 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1399 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1400 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1401 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1402 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1403 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1404 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1405 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1406 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
1407 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1408 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1409 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1410 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1411 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1412 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1413 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
1414 }; | |
1415 | |
1416 #if (defined IA32) | |
1417 static Elf32_Half running_arch_code=EM_386; | |
1418 #elif (defined AMD64) | |
1419 static Elf32_Half running_arch_code=EM_X86_64; | |
1420 #elif (defined IA64) | |
1421 static Elf32_Half running_arch_code=EM_IA_64; | |
1422 #elif (defined __sparc) && (defined _LP64) | |
1423 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1424 #elif (defined __sparc) && (!defined _LP64) | |
1425 static Elf32_Half running_arch_code=EM_SPARC; | |
1426 #elif (defined __powerpc64__) | |
1427 static Elf32_Half running_arch_code=EM_PPC64; | |
1428 #elif (defined __powerpc__) | |
1429 static Elf32_Half running_arch_code=EM_PPC; | |
1430 #elif (defined ARM) | |
1431 static Elf32_Half running_arch_code=EM_ARM; | |
1432 #elif (defined S390) | |
1433 static Elf32_Half running_arch_code=EM_S390; | |
1434 #elif (defined ALPHA) | |
1435 static Elf32_Half running_arch_code=EM_ALPHA; | |
1436 #elif (defined MIPSEL) | |
1437 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1438 #elif (defined PARISC) | |
1439 static Elf32_Half running_arch_code=EM_PARISC; | |
1440 #elif (defined MIPS) | |
1441 static Elf32_Half running_arch_code=EM_MIPS; | |
1442 #elif (defined M68K) | |
1443 static Elf32_Half running_arch_code=EM_68K; | |
1444 #else | |
1445 #error Method os::dll_load requires that one of following is defined:\ | |
1446 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
1447 #endif | |
1448 | |
1449 // Identify compatability class for VM's architecture and library's architecture | |
1450 // Obtain string descriptions for architectures | |
1451 | |
1452 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1453 int running_arch_index=-1; | |
1454 | |
1455 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1456 if (running_arch_code == arch_array[i].code) { | |
1457 running_arch_index = i; | |
1458 } | |
1459 if (lib_arch.code == arch_array[i].code) { | |
1460 lib_arch.compat_class = arch_array[i].compat_class; | |
1461 lib_arch.name = arch_array[i].name; | |
1462 } | |
1463 } | |
1464 | |
1465 assert(running_arch_index != -1, | |
1466 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1467 if (running_arch_index == -1) { | |
1468 // Even though running architecture detection failed | |
1469 // we may still continue with reporting dlerror() message | |
1470 return NULL; | |
1471 } | |
1472 | |
1473 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1474 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1475 return NULL; | |
1476 } | |
1477 | |
1478 #ifndef S390 | |
1479 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
1480 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1481 return NULL; | |
1482 } | |
1483 #endif // !S390 | |
1484 | |
1485 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1486 if ( lib_arch.name!=NULL ) { | |
1487 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1488 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1489 lib_arch.name, arch_array[running_arch_index].name); | |
1490 } else { | |
1491 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1492 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1493 lib_arch.code, | |
1494 arch_array[running_arch_index].name); | |
1495 } | |
1496 } | |
1497 | |
1498 return NULL; | |
1499 } | |
1500 #endif /* !__APPLE__ */ | |
1501 | |
1502 // XXX: Do we need a lock around this as per Linux? | |
1503 void* os::dll_lookup(void* handle, const char* name) { | |
1504 return dlsym(handle, name); | |
1505 } | |
1506 | |
1507 | |
1508 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
1509 int fd = ::open(filename, O_RDONLY); | |
1510 if (fd == -1) { | |
1511 return false; | |
1512 } | |
1513 | |
1514 char buf[32]; | |
1515 int bytes; | |
1516 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
1517 st->print_raw(buf, bytes); | |
1518 } | |
1519 | |
1520 ::close(fd); | |
1521 | |
1522 return true; | |
1523 } | |
1524 | |
1525 void os::print_dll_info(outputStream *st) { | |
1526 st->print_cr("Dynamic libraries:"); | |
1527 #ifdef RTLD_DI_LINKMAP | |
1528 Dl_info dli; | |
1529 void *handle; | |
1530 Link_map *map; | |
1531 Link_map *p; | |
1532 | |
1533 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
1534 st->print_cr("Error: Cannot print dynamic libraries."); | |
1535 return; | |
1536 } | |
1537 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
1538 if (handle == NULL) { | |
1539 st->print_cr("Error: Cannot print dynamic libraries."); | |
1540 return; | |
1541 } | |
1542 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
1543 if (map == NULL) { | |
1544 st->print_cr("Error: Cannot print dynamic libraries."); | |
1545 return; | |
1546 } | |
1547 | |
1548 while (map->l_prev != NULL) | |
1549 map = map->l_prev; | |
1550 | |
1551 while (map != NULL) { | |
1552 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
1553 map = map->l_next; | |
1554 } | |
1555 | |
1556 dlclose(handle); | |
1557 #elif defined(__APPLE__) | |
1558 uint32_t count; | |
1559 uint32_t i; | |
1560 | |
1561 count = _dyld_image_count(); | |
1562 for (i = 1; i < count; i++) { | |
1563 const char *name = _dyld_get_image_name(i); | |
1564 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
1565 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
1566 } | |
1567 #else | |
1568 st->print_cr("Error: Cannot print dynamic libraries."); | |
1569 #endif | |
1570 } | |
1571 | |
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1572 void os::print_os_info_brief(outputStream* st) { |
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1573 st->print("Bsd"); |
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1574 |
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1575 os::Posix::print_uname_info(st); |
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1576 } |
3960 | 1577 |
1578 void os::print_os_info(outputStream* st) { | |
1579 st->print("OS:"); | |
6080
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1580 st->print("Bsd"); |
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1581 |
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1582 os::Posix::print_uname_info(st); |
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1583 |
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1584 os::Posix::print_rlimit_info(st); |
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1585 |
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1586 os::Posix::print_load_average(st); |
3960 | 1587 } |
1588 | |
1589 void os::pd_print_cpu_info(outputStream* st) { | |
1590 // Nothing to do for now. | |
1591 } | |
1592 | |
1593 void os::print_memory_info(outputStream* st) { | |
1594 | |
1595 st->print("Memory:"); | |
1596 st->print(" %dk page", os::vm_page_size()>>10); | |
1597 | |
1598 st->print(", physical " UINT64_FORMAT "k", | |
1599 os::physical_memory() >> 10); | |
1600 st->print("(" UINT64_FORMAT "k free)", | |
1601 os::available_memory() >> 10); | |
1602 st->cr(); | |
1603 | |
1604 // meminfo | |
1605 st->print("\n/proc/meminfo:\n"); | |
1606 _print_ascii_file("/proc/meminfo", st); | |
1607 st->cr(); | |
1608 } | |
1609 | |
1610 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
1611 // but they're the same for all the bsd arch that we support | |
1612 // and they're the same for solaris but there's no common place to put this. | |
1613 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
1614 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
1615 "ILL_COPROC", "ILL_BADSTK" }; | |
1616 | |
1617 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
1618 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
1619 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
1620 | |
1621 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
1622 | |
1623 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
1624 | |
1625 void os::print_siginfo(outputStream* st, void* siginfo) { | |
1626 st->print("siginfo:"); | |
1627 | |
1628 const int buflen = 100; | |
1629 char buf[buflen]; | |
1630 siginfo_t *si = (siginfo_t*)siginfo; | |
1631 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
1632 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
1633 st->print("si_errno=%s", buf); | |
1634 } else { | |
1635 st->print("si_errno=%d", si->si_errno); | |
1636 } | |
1637 const int c = si->si_code; | |
1638 assert(c > 0, "unexpected si_code"); | |
1639 switch (si->si_signo) { | |
1640 case SIGILL: | |
1641 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
1642 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1643 break; | |
1644 case SIGFPE: | |
1645 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
1646 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1647 break; | |
1648 case SIGSEGV: | |
1649 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
1650 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1651 break; | |
1652 case SIGBUS: | |
1653 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
1654 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1655 break; | |
1656 default: | |
1657 st->print(", si_code=%d", si->si_code); | |
1658 // no si_addr | |
1659 } | |
1660 | |
1661 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
1662 UseSharedSpaces) { | |
1663 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
1664 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
1665 st->print("\n\nError accessing class data sharing archive." \ | |
1666 " Mapped file inaccessible during execution, " \ | |
1667 " possible disk/network problem."); | |
1668 } | |
1669 } | |
1670 st->cr(); | |
1671 } | |
1672 | |
1673 | |
1674 static void print_signal_handler(outputStream* st, int sig, | |
1675 char* buf, size_t buflen); | |
1676 | |
1677 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1678 st->print_cr("Signal Handlers:"); | |
1679 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1680 print_signal_handler(st, SIGBUS , buf, buflen); | |
1681 print_signal_handler(st, SIGFPE , buf, buflen); | |
1682 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1683 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1684 print_signal_handler(st, SIGILL , buf, buflen); | |
1685 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1686 print_signal_handler(st, SR_signum, buf, buflen); | |
1687 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1688 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1689 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1690 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1691 } | |
1692 | |
1693 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1694 | |
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1695 // Find the full path to the current module, libjvm |
3960 | 1696 void os::jvm_path(char *buf, jint buflen) { |
1697 // Error checking. | |
1698 if (buflen < MAXPATHLEN) { | |
1699 assert(false, "must use a large-enough buffer"); | |
1700 buf[0] = '\0'; | |
1701 return; | |
1702 } | |
1703 // Lazy resolve the path to current module. | |
1704 if (saved_jvm_path[0] != 0) { | |
1705 strcpy(buf, saved_jvm_path); | |
1706 return; | |
1707 } | |
1708 | |
1709 char dli_fname[MAXPATHLEN]; | |
1710 bool ret = dll_address_to_library_name( | |
1711 CAST_FROM_FN_PTR(address, os::jvm_path), | |
1712 dli_fname, sizeof(dli_fname), NULL); | |
1713 assert(ret != 0, "cannot locate libjvm"); | |
1714 char *rp = realpath(dli_fname, buf); | |
1715 if (rp == NULL) | |
1716 return; | |
1717 | |
1718 if (Arguments::created_by_gamma_launcher()) { | |
1719 // Support for the gamma launcher. Typical value for buf is | |
4846 | 1720 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
3960 | 1721 // the right place in the string, then assume we are installed in a JDK and |
4846 | 1722 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
1723 // construct a path to the JVM being overridden. | |
1724 | |
3960 | 1725 const char *p = buf + strlen(buf) - 1; |
1726 for (int count = 0; p > buf && count < 5; ++count) { | |
1727 for (--p; p > buf && *p != '/'; --p) | |
1728 /* empty */ ; | |
1729 } | |
1730 | |
1731 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
1732 // Look for JAVA_HOME in the environment. | |
1733 char* java_home_var = ::getenv("JAVA_HOME"); | |
1734 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1735 char* jrelib_p; | |
1736 int len; | |
1737 | |
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1738 // Check the current module name "libjvm" |
3960 | 1739 p = strrchr(buf, '/'); |
1740 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
1741 | |
1742 rp = realpath(java_home_var, buf); | |
1743 if (rp == NULL) | |
1744 return; | |
1745 | |
1746 // determine if this is a legacy image or modules image | |
1747 // modules image doesn't have "jre" subdirectory | |
1748 len = strlen(buf); | |
1749 jrelib_p = buf + len; | |
4846 | 1750 |
1751 // Add the appropriate library subdir | |
1752 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
3960 | 1753 if (0 != access(buf, F_OK)) { |
4846 | 1754 snprintf(jrelib_p, buflen-len, "/lib"); |
3960 | 1755 } |
1756 | |
4846 | 1757 // Add the appropriate client or server subdir |
1758 len = strlen(buf); | |
1759 jrelib_p = buf + len; | |
1760 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
1761 if (0 != access(buf, F_OK)) { | |
1762 snprintf(jrelib_p, buflen-len, ""); | |
1763 } | |
1764 | |
1765 // If the path exists within JAVA_HOME, add the JVM library name | |
1766 // to complete the path to JVM being overridden. Otherwise fallback | |
1767 // to the path to the current library. | |
3960 | 1768 if (0 == access(buf, F_OK)) { |
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1769 // Use current module name "libjvm" |
3960 | 1770 len = strlen(buf); |
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1771 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
3960 | 1772 } else { |
4846 | 1773 // Fall back to path of current library |
3960 | 1774 rp = realpath(dli_fname, buf); |
1775 if (rp == NULL) | |
1776 return; | |
1777 } | |
1778 } | |
1779 } | |
1780 } | |
1781 | |
1782 strcpy(saved_jvm_path, buf); | |
1783 } | |
1784 | |
1785 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1786 // no prefix required, not even "_" | |
1787 } | |
1788 | |
1789 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1790 // no suffix required | |
1791 } | |
1792 | |
1793 //////////////////////////////////////////////////////////////////////////////// | |
1794 // sun.misc.Signal support | |
1795 | |
1796 static volatile jint sigint_count = 0; | |
1797 | |
1798 static void | |
1799 UserHandler(int sig, void *siginfo, void *context) { | |
1800 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1801 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1802 // don't want to flood the manager thread with sem_post requests. | |
1803 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1804 return; | |
1805 | |
1806 // Ctrl-C is pressed during error reporting, likely because the error | |
1807 // handler fails to abort. Let VM die immediately. | |
1808 if (sig == SIGINT && is_error_reported()) { | |
1809 os::die(); | |
1810 } | |
1811 | |
1812 os::signal_notify(sig); | |
1813 } | |
1814 | |
1815 void* os::user_handler() { | |
1816 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1817 } | |
1818 | |
1819 extern "C" { | |
1820 typedef void (*sa_handler_t)(int); | |
1821 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1822 } | |
1823 | |
1824 void* os::signal(int signal_number, void* handler) { | |
1825 struct sigaction sigAct, oldSigAct; | |
1826 | |
1827 sigfillset(&(sigAct.sa_mask)); | |
1828 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1829 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1830 | |
1831 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1832 // -1 means registration failed | |
1833 return (void *)-1; | |
1834 } | |
1835 | |
1836 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1837 } | |
1838 | |
1839 void os::signal_raise(int signal_number) { | |
1840 ::raise(signal_number); | |
1841 } | |
1842 | |
1843 /* | |
1844 * The following code is moved from os.cpp for making this | |
1845 * code platform specific, which it is by its very nature. | |
1846 */ | |
1847 | |
1848 // Will be modified when max signal is changed to be dynamic | |
1849 int os::sigexitnum_pd() { | |
1850 return NSIG; | |
1851 } | |
1852 | |
1853 // a counter for each possible signal value | |
1854 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1855 | |
1856 // Bsd(POSIX) specific hand shaking semaphore. | |
1857 #ifdef __APPLE__ | |
1858 static semaphore_t sig_sem; | |
1859 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) | |
1860 #define SEM_WAIT(sem) semaphore_wait(sem); | |
1861 #define SEM_POST(sem) semaphore_signal(sem); | |
1862 #else | |
1863 static sem_t sig_sem; | |
1864 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) | |
1865 #define SEM_WAIT(sem) sem_wait(&sem); | |
1866 #define SEM_POST(sem) sem_post(&sem); | |
1867 #endif | |
1868 | |
1869 void os::signal_init_pd() { | |
1870 // Initialize signal structures | |
1871 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
1872 | |
1873 // Initialize signal semaphore | |
1874 ::SEM_INIT(sig_sem, 0); | |
1875 } | |
1876 | |
1877 void os::signal_notify(int sig) { | |
1878 Atomic::inc(&pending_signals[sig]); | |
1879 ::SEM_POST(sig_sem); | |
1880 } | |
1881 | |
1882 static int check_pending_signals(bool wait) { | |
1883 Atomic::store(0, &sigint_count); | |
1884 for (;;) { | |
1885 for (int i = 0; i < NSIG + 1; i++) { | |
1886 jint n = pending_signals[i]; | |
1887 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
1888 return i; | |
1889 } | |
1890 } | |
1891 if (!wait) { | |
1892 return -1; | |
1893 } | |
1894 JavaThread *thread = JavaThread::current(); | |
1895 ThreadBlockInVM tbivm(thread); | |
1896 | |
1897 bool threadIsSuspended; | |
1898 do { | |
1899 thread->set_suspend_equivalent(); | |
1900 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
1901 ::SEM_WAIT(sig_sem); | |
1902 | |
1903 // were we externally suspended while we were waiting? | |
1904 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
1905 if (threadIsSuspended) { | |
1906 // | |
1907 // The semaphore has been incremented, but while we were waiting | |
1908 // another thread suspended us. We don't want to continue running | |
1909 // while suspended because that would surprise the thread that | |
1910 // suspended us. | |
1911 // | |
1912 ::SEM_POST(sig_sem); | |
1913 | |
1914 thread->java_suspend_self(); | |
1915 } | |
1916 } while (threadIsSuspended); | |
1917 } | |
1918 } | |
1919 | |
1920 int os::signal_lookup() { | |
1921 return check_pending_signals(false); | |
1922 } | |
1923 | |
1924 int os::signal_wait() { | |
1925 return check_pending_signals(true); | |
1926 } | |
1927 | |
1928 //////////////////////////////////////////////////////////////////////////////// | |
1929 // Virtual Memory | |
1930 | |
1931 int os::vm_page_size() { | |
1932 // Seems redundant as all get out | |
1933 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
1934 return os::Bsd::page_size(); | |
1935 } | |
1936 | |
1937 // Solaris allocates memory by pages. | |
1938 int os::vm_allocation_granularity() { | |
1939 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
1940 return os::Bsd::page_size(); | |
1941 } | |
1942 | |
1943 // Rationale behind this function: | |
1944 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
1945 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
1946 // samples for JITted code. Here we create private executable mapping over the code cache | |
1947 // and then we can use standard (well, almost, as mapping can change) way to provide | |
1948 // info for the reporting script by storing timestamp and location of symbol | |
1949 void bsd_wrap_code(char* base, size_t size) { | |
1950 static volatile jint cnt = 0; | |
1951 | |
1952 if (!UseOprofile) { | |
1953 return; | |
1954 } | |
1955 | |
1956 char buf[PATH_MAX + 1]; | |
1957 int num = Atomic::add(1, &cnt); | |
1958 | |
1959 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
1960 os::get_temp_directory(), os::current_process_id(), num); | |
1961 unlink(buf); | |
1962 | |
1963 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
1964 | |
1965 if (fd != -1) { | |
1966 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
1967 if (rv != (off_t)-1) { | |
1968 if (::write(fd, "", 1) == 1) { | |
1969 mmap(base, size, | |
1970 PROT_READ|PROT_WRITE|PROT_EXEC, | |
1971 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
1972 } | |
1973 } | |
1974 ::close(fd); | |
1975 unlink(buf); | |
1976 } | |
1977 } | |
1978 | |
1979 // NOTE: Bsd kernel does not really reserve the pages for us. | |
1980 // All it does is to check if there are enough free pages | |
1981 // left at the time of mmap(). This could be a potential | |
1982 // problem. | |
6197 | 1983 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
3960 | 1984 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
1985 #ifdef __OpenBSD__ | |
1986 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
1987 return ::mprotect(addr, size, prot) == 0; | |
1988 #else | |
1989 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
1990 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
1991 return res != (uintptr_t) MAP_FAILED; | |
1992 #endif | |
1993 } | |
1994 | |
1995 | |
6197 | 1996 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
3960 | 1997 bool exec) { |
1998 return commit_memory(addr, size, exec); | |
1999 } | |
2000 | |
6197 | 2001 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2002 } |
2003 | |
6197 | 2004 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2005 ::madvise(addr, bytes, MADV_DONTNEED); |
2006 } | |
2007 | |
2008 void os::numa_make_global(char *addr, size_t bytes) { | |
2009 } | |
2010 | |
2011 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2012 } | |
2013 | |
2014 bool os::numa_topology_changed() { return false; } | |
2015 | |
2016 size_t os::numa_get_groups_num() { | |
2017 return 1; | |
2018 } | |
2019 | |
2020 int os::numa_get_group_id() { | |
2021 return 0; | |
2022 } | |
2023 | |
2024 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2025 if (size > 0) { | |
2026 ids[0] = 0; | |
2027 return 1; | |
2028 } | |
2029 return 0; | |
2030 } | |
2031 | |
2032 bool os::get_page_info(char *start, page_info* info) { | |
2033 return false; | |
2034 } | |
2035 | |
2036 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2037 return end; | |
2038 } | |
2039 | |
2040 | |
6197 | 2041 bool os::pd_uncommit_memory(char* addr, size_t size) { |
3960 | 2042 #ifdef __OpenBSD__ |
2043 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
2044 return ::mprotect(addr, size, PROT_NONE) == 0; | |
2045 #else | |
2046 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
2047 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
2048 return res != (uintptr_t) MAP_FAILED; | |
2049 #endif | |
2050 } | |
2051 | |
6197 | 2052 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
3960 | 2053 return os::commit_memory(addr, size); |
2054 } | |
2055 | |
2056 // If this is a growable mapping, remove the guard pages entirely by | |
2057 // munmap()ping them. If not, just call uncommit_memory(). | |
2058 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2059 return os::uncommit_memory(addr, size); | |
2060 } | |
2061 | |
2062 static address _highest_vm_reserved_address = NULL; | |
2063 | |
2064 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2065 // at 'requested_addr'. If there are existing memory mappings at the same | |
2066 // location, however, they will be overwritten. If 'fixed' is false, | |
2067 // 'requested_addr' is only treated as a hint, the return value may or | |
2068 // may not start from the requested address. Unlike Bsd mmap(), this | |
2069 // function returns NULL to indicate failure. | |
2070 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2071 char * addr; | |
2072 int flags; | |
2073 | |
2074 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2075 if (fixed) { | |
2076 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
2077 flags |= MAP_FIXED; | |
2078 } | |
2079 | |
2080 // Map uncommitted pages PROT_READ and PROT_WRITE, change access | |
2081 // to PROT_EXEC if executable when we commit the page. | |
2082 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, | |
2083 flags, -1, 0); | |
2084 | |
2085 if (addr != MAP_FAILED) { | |
2086 // anon_mmap() should only get called during VM initialization, | |
2087 // don't need lock (actually we can skip locking even it can be called | |
2088 // from multiple threads, because _highest_vm_reserved_address is just a | |
2089 // hint about the upper limit of non-stack memory regions.) | |
2090 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2091 _highest_vm_reserved_address = (address)addr + bytes; | |
2092 } | |
2093 } | |
2094 | |
2095 return addr == MAP_FAILED ? NULL : addr; | |
2096 } | |
2097 | |
2098 // Don't update _highest_vm_reserved_address, because there might be memory | |
2099 // regions above addr + size. If so, releasing a memory region only creates | |
2100 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2101 // | |
2102 static int anon_munmap(char * addr, size_t size) { | |
2103 return ::munmap(addr, size) == 0; | |
2104 } | |
2105 | |
6197 | 2106 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
3960 | 2107 size_t alignment_hint) { |
2108 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2109 } | |
2110 | |
6197 | 2111 bool os::pd_release_memory(char* addr, size_t size) { |
3960 | 2112 return anon_munmap(addr, size); |
2113 } | |
2114 | |
2115 static address highest_vm_reserved_address() { | |
2116 return _highest_vm_reserved_address; | |
2117 } | |
2118 | |
2119 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
2120 // Bsd wants the mprotect address argument to be page aligned. | |
2121 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
2122 | |
2123 // According to SUSv3, mprotect() should only be used with mappings | |
2124 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2125 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2126 // protection of malloc'ed or statically allocated memory). Check the | |
2127 // caller if you hit this assert. | |
2128 assert(addr == bottom, "sanity check"); | |
2129 | |
2130 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
2131 return ::mprotect(bottom, size, prot) == 0; | |
2132 } | |
2133 | |
2134 // Set protections specified | |
2135 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
2136 bool is_committed) { | |
2137 unsigned int p = 0; | |
2138 switch (prot) { | |
2139 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2140 case MEM_PROT_READ: p = PROT_READ; break; | |
2141 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2142 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2143 default: | |
2144 ShouldNotReachHere(); | |
2145 } | |
2146 // is_committed is unused. | |
2147 return bsd_mprotect(addr, bytes, p); | |
2148 } | |
2149 | |
2150 bool os::guard_memory(char* addr, size_t size) { | |
2151 return bsd_mprotect(addr, size, PROT_NONE); | |
2152 } | |
2153 | |
2154 bool os::unguard_memory(char* addr, size_t size) { | |
2155 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
2156 } | |
2157 | |
2158 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
6918 | 2159 return false; |
3960 | 2160 } |
2161 | |
2162 /* | |
2163 * Set the coredump_filter bits to include largepages in core dump (bit 6) | |
2164 * | |
2165 * From the coredump_filter documentation: | |
2166 * | |
2167 * - (bit 0) anonymous private memory | |
2168 * - (bit 1) anonymous shared memory | |
2169 * - (bit 2) file-backed private memory | |
2170 * - (bit 3) file-backed shared memory | |
2171 * - (bit 4) ELF header pages in file-backed private memory areas (it is | |
2172 * effective only if the bit 2 is cleared) | |
2173 * - (bit 5) hugetlb private memory | |
2174 * - (bit 6) hugetlb shared memory | |
2175 */ | |
2176 static void set_coredump_filter(void) { | |
2177 FILE *f; | |
2178 long cdm; | |
2179 | |
2180 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { | |
2181 return; | |
2182 } | |
2183 | |
2184 if (fscanf(f, "%lx", &cdm) != 1) { | |
2185 fclose(f); | |
2186 return; | |
2187 } | |
2188 | |
2189 rewind(f); | |
2190 | |
2191 if ((cdm & LARGEPAGES_BIT) == 0) { | |
2192 cdm |= LARGEPAGES_BIT; | |
2193 fprintf(f, "%#lx", cdm); | |
2194 } | |
2195 | |
2196 fclose(f); | |
2197 } | |
2198 | |
2199 // Large page support | |
2200 | |
2201 static size_t _large_page_size = 0; | |
2202 | |
2203 void os::large_page_init() { | |
2204 } | |
2205 | |
2206 | |
2207 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
2208 // "exec" is passed in but not used. Creating the shared image for | |
2209 // the code cache doesn't have an SHM_X executable permission to check. | |
2210 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
2211 | |
2212 key_t key = IPC_PRIVATE; | |
2213 char *addr; | |
2214 | |
2215 bool warn_on_failure = UseLargePages && | |
2216 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2217 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2218 ); | |
2219 char msg[128]; | |
2220 | |
2221 // Create a large shared memory region to attach to based on size. | |
2222 // Currently, size is the total size of the heap | |
2223 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
2224 if (shmid == -1) { | |
2225 // Possible reasons for shmget failure: | |
2226 // 1. shmmax is too small for Java heap. | |
2227 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2228 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2229 // 2. not enough large page memory. | |
2230 // > check available large pages: cat /proc/meminfo | |
2231 // > increase amount of large pages: | |
2232 // echo new_value > /proc/sys/vm/nr_hugepages | |
2233 // Note 1: different Bsd may use different name for this property, | |
2234 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2235 // Note 2: it's possible there's enough physical memory available but | |
2236 // they are so fragmented after a long run that they can't | |
2237 // coalesce into large pages. Try to reserve large pages when | |
2238 // the system is still "fresh". | |
2239 if (warn_on_failure) { | |
2240 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2241 warning(msg); | |
2242 } | |
2243 return NULL; | |
2244 } | |
2245 | |
2246 // attach to the region | |
2247 addr = (char*)shmat(shmid, req_addr, 0); | |
2248 int err = errno; | |
2249 | |
2250 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2251 // will be deleted when it's detached by shmdt() or when the process | |
2252 // terminates. If shmat() is not successful this will remove the shared | |
2253 // segment immediately. | |
2254 shmctl(shmid, IPC_RMID, NULL); | |
2255 | |
2256 if ((intptr_t)addr == -1) { | |
2257 if (warn_on_failure) { | |
2258 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2259 warning(msg); | |
2260 } | |
2261 return NULL; | |
2262 } | |
2263 | |
2264 return addr; | |
2265 } | |
2266 | |
2267 bool os::release_memory_special(char* base, size_t bytes) { | |
2268 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
2269 int rslt = shmdt(base); | |
2270 return rslt == 0; | |
2271 } | |
2272 | |
2273 size_t os::large_page_size() { | |
2274 return _large_page_size; | |
2275 } | |
2276 | |
2277 // HugeTLBFS allows application to commit large page memory on demand; | |
2278 // with SysV SHM the entire memory region must be allocated as shared | |
2279 // memory. | |
2280 bool os::can_commit_large_page_memory() { | |
2281 return UseHugeTLBFS; | |
2282 } | |
2283 | |
2284 bool os::can_execute_large_page_memory() { | |
2285 return UseHugeTLBFS; | |
2286 } | |
2287 | |
2288 // Reserve memory at an arbitrary address, only if that area is | |
2289 // available (and not reserved for something else). | |
2290 | |
6197 | 2291 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
3960 | 2292 const int max_tries = 10; |
2293 char* base[max_tries]; | |
2294 size_t size[max_tries]; | |
2295 const size_t gap = 0x000000; | |
2296 | |
2297 // Assert only that the size is a multiple of the page size, since | |
2298 // that's all that mmap requires, and since that's all we really know | |
2299 // about at this low abstraction level. If we need higher alignment, | |
2300 // we can either pass an alignment to this method or verify alignment | |
2301 // in one of the methods further up the call chain. See bug 5044738. | |
2302 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
2303 | |
2304 // Repeatedly allocate blocks until the block is allocated at the | |
2305 // right spot. Give up after max_tries. Note that reserve_memory() will | |
2306 // automatically update _highest_vm_reserved_address if the call is | |
2307 // successful. The variable tracks the highest memory address every reserved | |
2308 // by JVM. It is used to detect heap-stack collision if running with | |
2309 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
2310 // space than needed, it could confuse the collision detecting code. To | |
2311 // solve the problem, save current _highest_vm_reserved_address and | |
2312 // calculate the correct value before return. | |
2313 address old_highest = _highest_vm_reserved_address; | |
2314 | |
2315 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
2316 // if kernel honors the hint then we can return immediately. | |
2317 char * addr = anon_mmap(requested_addr, bytes, false); | |
2318 if (addr == requested_addr) { | |
2319 return requested_addr; | |
2320 } | |
2321 | |
2322 if (addr != NULL) { | |
2323 // mmap() is successful but it fails to reserve at the requested address | |
2324 anon_munmap(addr, bytes); | |
2325 } | |
2326 | |
2327 int i; | |
2328 for (i = 0; i < max_tries; ++i) { | |
2329 base[i] = reserve_memory(bytes); | |
2330 | |
2331 if (base[i] != NULL) { | |
2332 // Is this the block we wanted? | |
2333 if (base[i] == requested_addr) { | |
2334 size[i] = bytes; | |
2335 break; | |
2336 } | |
2337 | |
2338 // Does this overlap the block we wanted? Give back the overlapped | |
2339 // parts and try again. | |
2340 | |
2341 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
2342 if (top_overlap >= 0 && top_overlap < bytes) { | |
2343 unmap_memory(base[i], top_overlap); | |
2344 base[i] += top_overlap; | |
2345 size[i] = bytes - top_overlap; | |
2346 } else { | |
2347 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
2348 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
2349 unmap_memory(requested_addr, bottom_overlap); | |
2350 size[i] = bytes - bottom_overlap; | |
2351 } else { | |
2352 size[i] = bytes; | |
2353 } | |
2354 } | |
2355 } | |
2356 } | |
2357 | |
2358 // Give back the unused reserved pieces. | |
2359 | |
2360 for (int j = 0; j < i; ++j) { | |
2361 if (base[j] != NULL) { | |
2362 unmap_memory(base[j], size[j]); | |
2363 } | |
2364 } | |
2365 | |
2366 if (i < max_tries) { | |
2367 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
2368 return requested_addr; | |
2369 } else { | |
2370 _highest_vm_reserved_address = old_highest; | |
2371 return NULL; | |
2372 } | |
2373 } | |
2374 | |
2375 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2376 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
2377 } | |
2378 | |
2379 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
2380 // Solaris uses poll(), bsd uses park(). | |
2381 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
2382 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
2383 // SIGSEGV, see 4355769. | |
2384 | |
2385 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2386 assert(thread == Thread::current(), "thread consistency check"); | |
2387 | |
2388 ParkEvent * const slp = thread->_SleepEvent ; | |
2389 slp->reset() ; | |
2390 OrderAccess::fence() ; | |
2391 | |
2392 if (interruptible) { | |
2393 jlong prevtime = javaTimeNanos(); | |
2394 | |
2395 for (;;) { | |
2396 if (os::is_interrupted(thread, true)) { | |
2397 return OS_INTRPT; | |
2398 } | |
2399 | |
2400 jlong newtime = javaTimeNanos(); | |
2401 | |
2402 if (newtime - prevtime < 0) { | |
2403 // time moving backwards, should only happen if no monotonic clock | |
2404 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2405 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2406 } else { | |
4712
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|
2407 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2408 } |
2409 | |
2410 if(millis <= 0) { | |
2411 return OS_OK; | |
2412 } | |
2413 | |
2414 prevtime = newtime; | |
2415 | |
2416 { | |
2417 assert(thread->is_Java_thread(), "sanity check"); | |
2418 JavaThread *jt = (JavaThread *) thread; | |
2419 ThreadBlockInVM tbivm(jt); | |
2420 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2421 | |
2422 jt->set_suspend_equivalent(); | |
2423 // cleared by handle_special_suspend_equivalent_condition() or | |
2424 // java_suspend_self() via check_and_wait_while_suspended() | |
2425 | |
2426 slp->park(millis); | |
2427 | |
2428 // were we externally suspended while we were waiting? | |
2429 jt->check_and_wait_while_suspended(); | |
2430 } | |
2431 } | |
2432 } else { | |
2433 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2434 jlong prevtime = javaTimeNanos(); | |
2435 | |
2436 for (;;) { | |
2437 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2438 // the 1st iteration ... | |
2439 jlong newtime = javaTimeNanos(); | |
2440 | |
2441 if (newtime - prevtime < 0) { | |
2442 // time moving backwards, should only happen if no monotonic clock | |
2443 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2444 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2445 } else { | |
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|
2446 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2447 } |
2448 | |
2449 if(millis <= 0) break ; | |
2450 | |
2451 prevtime = newtime; | |
2452 slp->park(millis); | |
2453 } | |
2454 return OS_OK ; | |
2455 } | |
2456 } | |
2457 | |
2458 int os::naked_sleep() { | |
2459 // %% make the sleep time an integer flag. for now use 1 millisec. | |
2460 return os::sleep(Thread::current(), 1, false); | |
2461 } | |
2462 | |
2463 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2464 void os::infinite_sleep() { | |
2465 while (true) { // sleep forever ... | |
2466 ::sleep(100); // ... 100 seconds at a time | |
2467 } | |
2468 } | |
2469 | |
2470 // Used to convert frequent JVM_Yield() to nops | |
2471 bool os::dont_yield() { | |
2472 return DontYieldALot; | |
2473 } | |
2474 | |
2475 void os::yield() { | |
2476 sched_yield(); | |
2477 } | |
2478 | |
2479 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
2480 | |
2481 void os::yield_all(int attempts) { | |
2482 // Yields to all threads, including threads with lower priorities | |
2483 // Threads on Bsd are all with same priority. The Solaris style | |
2484 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2485 sched_yield(); | |
2486 } | |
2487 | |
2488 // Called from the tight loops to possibly influence time-sharing heuristics | |
2489 void os::loop_breaker(int attempts) { | |
2490 os::yield_all(attempts); | |
2491 } | |
2492 | |
2493 //////////////////////////////////////////////////////////////////////////////// | |
2494 // thread priority support | |
2495 | |
2496 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
2497 // only supports dynamic priority, static priority must be zero. For real-time | |
2498 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
2499 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
2500 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
2501 // of 5 runs - Sep 2005). | |
2502 // | |
2503 // The following code actually changes the niceness of kernel-thread/LWP. It | |
2504 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
2505 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
2506 // threads. It has always been the case, but could change in the future. For | |
2507 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
2508 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
2509 | |
6918 | 2510 #if !defined(__APPLE__) |
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2511 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2512 19, // 0 Entry should never be used |
2513 | |
2514 0, // 1 MinPriority | |
2515 3, // 2 | |
2516 6, // 3 | |
2517 | |
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2518 10, // 4 |
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2519 15, // 5 NormPriority |
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2520 18, // 6 |
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2521 |
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2522 21, // 7 |
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2523 25, // 8 |
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2524 28, // 9 NearMaxPriority |
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2525 |
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2526 31, // 10 MaxPriority |
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2527 |
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2528 31 // 11 CriticalPriority |
3960 | 2529 }; |
6918 | 2530 #else |
3960 | 2531 /* Using Mach high-level priority assignments */ |
4854
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2532 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2533 0, // 0 Entry should never be used (MINPRI_USER) |
2534 | |
2535 27, // 1 MinPriority | |
2536 28, // 2 | |
2537 29, // 3 | |
2538 | |
2539 30, // 4 | |
2540 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
2541 32, // 6 | |
2542 | |
2543 33, // 7 | |
2544 34, // 8 | |
2545 35, // 9 NearMaxPriority | |
2546 | |
4854
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2547 36, // 10 MaxPriority |
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2548 |
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2549 36 // 11 CriticalPriority |
3960 | 2550 }; |
2551 #endif | |
2552 | |
2553 static int prio_init() { | |
2554 if (ThreadPriorityPolicy == 1) { | |
2555 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
2556 // if effective uid is not root. Perhaps, a more elegant way of doing | |
2557 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
2558 if (geteuid() != 0) { | |
2559 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
2560 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
2561 } | |
2562 ThreadPriorityPolicy = 0; | |
2563 } | |
2564 } | |
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2565 if (UseCriticalJavaThreadPriority) { |
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2566 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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2567 } |
3960 | 2568 return 0; |
2569 } | |
2570 | |
2571 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2572 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
2573 | |
2574 #ifdef __OpenBSD__ | |
2575 // OpenBSD pthread_setprio starves low priority threads | |
2576 return OS_OK; | |
2577 #elif defined(__FreeBSD__) | |
2578 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
2579 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2580 struct sched_param sp; | |
2581 int policy; | |
2582 pthread_t self = pthread_self(); | |
2583 | |
2584 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
2585 return OS_ERR; | |
2586 | |
2587 sp.sched_priority = newpri; | |
2588 if (pthread_setschedparam(self, policy, &sp) != 0) | |
2589 return OS_ERR; | |
2590 | |
2591 return OS_OK; | |
2592 #else | |
2593 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
2594 return (ret == 0) ? OS_OK : OS_ERR; | |
2595 #endif | |
2596 } | |
2597 | |
2598 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2599 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
2600 *priority_ptr = java_to_os_priority[NormPriority]; | |
2601 return OS_OK; | |
2602 } | |
2603 | |
2604 errno = 0; | |
2605 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
2606 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
2607 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2608 int policy; | |
2609 struct sched_param sp; | |
2610 | |
2611 pthread_getschedparam(pthread_self(), &policy, &sp); | |
2612 *priority_ptr = sp.sched_priority; | |
2613 #else | |
2614 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
2615 #endif | |
2616 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
2617 } | |
2618 | |
2619 // Hint to the underlying OS that a task switch would not be good. | |
2620 // Void return because it's a hint and can fail. | |
2621 void os::hint_no_preempt() {} | |
2622 | |
2623 //////////////////////////////////////////////////////////////////////////////// | |
2624 // suspend/resume support | |
2625 | |
2626 // the low-level signal-based suspend/resume support is a remnant from the | |
2627 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2628 // within hotspot. Now there is a single use-case for this: | |
2629 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2630 // that runs in the watcher thread. | |
2631 // The remaining code is greatly simplified from the more general suspension | |
2632 // code that used to be used. | |
2633 // | |
2634 // The protocol is quite simple: | |
2635 // - suspend: | |
2636 // - sends a signal to the target thread | |
2637 // - polls the suspend state of the osthread using a yield loop | |
2638 // - target thread signal handler (SR_handler) sets suspend state | |
2639 // and blocks in sigsuspend until continued | |
2640 // - resume: | |
2641 // - sets target osthread state to continue | |
2642 // - sends signal to end the sigsuspend loop in the SR_handler | |
2643 // | |
2644 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
2645 // | |
2646 | |
2647 static void resume_clear_context(OSThread *osthread) { | |
2648 osthread->set_ucontext(NULL); | |
2649 osthread->set_siginfo(NULL); | |
2650 | |
2651 // notify the suspend action is completed, we have now resumed | |
2652 osthread->sr.clear_suspended(); | |
2653 } | |
2654 | |
2655 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
2656 osthread->set_ucontext(context); | |
2657 osthread->set_siginfo(siginfo); | |
2658 } | |
2659 | |
2660 // | |
2661 // Handler function invoked when a thread's execution is suspended or | |
2662 // resumed. We have to be careful that only async-safe functions are | |
2663 // called here (Note: most pthread functions are not async safe and | |
2664 // should be avoided.) | |
2665 // | |
2666 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
2667 // interface point of view, but sigwait() prevents the signal hander | |
2668 // from being run. libpthread would get very confused by not having | |
2669 // its signal handlers run and prevents sigwait()'s use with the | |
2670 // mutex granting granting signal. | |
2671 // | |
2672 // Currently only ever called on the VMThread | |
2673 // | |
2674 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
2675 // Save and restore errno to avoid confusing native code with EINTR | |
2676 // after sigsuspend. | |
2677 int old_errno = errno; | |
2678 | |
2679 Thread* thread = Thread::current(); | |
2680 OSThread* osthread = thread->osthread(); | |
2681 assert(thread->is_VM_thread(), "Must be VMThread"); | |
2682 // read current suspend action | |
2683 int action = osthread->sr.suspend_action(); | |
2684 if (action == SR_SUSPEND) { | |
2685 suspend_save_context(osthread, siginfo, context); | |
2686 | |
2687 // Notify the suspend action is about to be completed. do_suspend() | |
2688 // waits until SR_SUSPENDED is set and then returns. We will wait | |
2689 // here for a resume signal and that completes the suspend-other | |
2690 // action. do_suspend/do_resume is always called as a pair from | |
2691 // the same thread - so there are no races | |
2692 | |
2693 // notify the caller | |
2694 osthread->sr.set_suspended(); | |
2695 | |
2696 sigset_t suspend_set; // signals for sigsuspend() | |
2697 | |
2698 // get current set of blocked signals and unblock resume signal | |
2699 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
2700 sigdelset(&suspend_set, SR_signum); | |
2701 | |
2702 // wait here until we are resumed | |
2703 do { | |
2704 sigsuspend(&suspend_set); | |
2705 // ignore all returns until we get a resume signal | |
2706 } while (osthread->sr.suspend_action() != SR_CONTINUE); | |
2707 | |
2708 resume_clear_context(osthread); | |
2709 | |
2710 } else { | |
2711 assert(action == SR_CONTINUE, "unexpected sr action"); | |
2712 // nothing special to do - just leave the handler | |
2713 } | |
2714 | |
2715 errno = old_errno; | |
2716 } | |
2717 | |
2718 | |
2719 static int SR_initialize() { | |
2720 struct sigaction act; | |
2721 char *s; | |
2722 /* Get signal number to use for suspend/resume */ | |
2723 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
2724 int sig = ::strtol(s, 0, 10); | |
2725 if (sig > 0 || sig < NSIG) { | |
2726 SR_signum = sig; | |
2727 } | |
2728 } | |
2729 | |
2730 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
2731 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
2732 | |
2733 sigemptyset(&SR_sigset); | |
2734 sigaddset(&SR_sigset, SR_signum); | |
2735 | |
2736 /* Set up signal handler for suspend/resume */ | |
2737 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
2738 act.sa_handler = (void (*)(int)) SR_handler; | |
2739 | |
2740 // SR_signum is blocked by default. | |
2741 // 4528190 - We also need to block pthread restart signal (32 on all | |
2742 // supported Bsd platforms). Note that BsdThreads need to block | |
2743 // this signal for all threads to work properly. So we don't have | |
2744 // to use hard-coded signal number when setting up the mask. | |
2745 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
2746 | |
2747 if (sigaction(SR_signum, &act, 0) == -1) { | |
2748 return -1; | |
2749 } | |
2750 | |
2751 // Save signal flag | |
2752 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
2753 return 0; | |
2754 } | |
2755 | |
2756 static int SR_finalize() { | |
2757 return 0; | |
2758 } | |
2759 | |
2760 | |
2761 // returns true on success and false on error - really an error is fatal | |
2762 // but this seems the normal response to library errors | |
2763 static bool do_suspend(OSThread* osthread) { | |
2764 // mark as suspended and send signal | |
2765 osthread->sr.set_suspend_action(SR_SUSPEND); | |
2766 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2767 assert_status(status == 0, status, "pthread_kill"); | |
2768 | |
2769 // check status and wait until notified of suspension | |
2770 if (status == 0) { | |
2771 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
2772 os::yield_all(i); | |
2773 } | |
2774 osthread->sr.set_suspend_action(SR_NONE); | |
2775 return true; | |
2776 } | |
2777 else { | |
2778 osthread->sr.set_suspend_action(SR_NONE); | |
2779 return false; | |
2780 } | |
2781 } | |
2782 | |
2783 static void do_resume(OSThread* osthread) { | |
2784 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
2785 osthread->sr.set_suspend_action(SR_CONTINUE); | |
2786 | |
2787 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2788 assert_status(status == 0, status, "pthread_kill"); | |
2789 // check status and wait unit notified of resumption | |
2790 if (status == 0) { | |
2791 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
2792 os::yield_all(i); | |
2793 } | |
2794 } | |
2795 osthread->sr.set_suspend_action(SR_NONE); | |
2796 } | |
2797 | |
2798 //////////////////////////////////////////////////////////////////////////////// | |
2799 // interrupt support | |
2800 | |
2801 void os::interrupt(Thread* thread) { | |
2802 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2803 "possibility of dangling Thread pointer"); | |
2804 | |
2805 OSThread* osthread = thread->osthread(); | |
2806 | |
2807 if (!osthread->interrupted()) { | |
2808 osthread->set_interrupted(true); | |
2809 // More than one thread can get here with the same value of osthread, | |
2810 // resulting in multiple notifications. We do, however, want the store | |
2811 // to interrupted() to be visible to other threads before we execute unpark(). | |
2812 OrderAccess::fence(); | |
2813 ParkEvent * const slp = thread->_SleepEvent ; | |
2814 if (slp != NULL) slp->unpark() ; | |
2815 } | |
2816 | |
2817 // For JSR166. Unpark even if interrupt status already was set | |
2818 if (thread->is_Java_thread()) | |
2819 ((JavaThread*)thread)->parker()->unpark(); | |
2820 | |
2821 ParkEvent * ev = thread->_ParkEvent ; | |
2822 if (ev != NULL) ev->unpark() ; | |
2823 | |
2824 } | |
2825 | |
2826 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
2827 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2828 "possibility of dangling Thread pointer"); | |
2829 | |
2830 OSThread* osthread = thread->osthread(); | |
2831 | |
2832 bool interrupted = osthread->interrupted(); | |
2833 | |
2834 if (interrupted && clear_interrupted) { | |
2835 osthread->set_interrupted(false); | |
2836 // consider thread->_SleepEvent->reset() ... optional optimization | |
2837 } | |
2838 | |
2839 return interrupted; | |
2840 } | |
2841 | |
2842 /////////////////////////////////////////////////////////////////////////////////// | |
2843 // signal handling (except suspend/resume) | |
2844 | |
2845 // This routine may be used by user applications as a "hook" to catch signals. | |
2846 // The user-defined signal handler must pass unrecognized signals to this | |
2847 // routine, and if it returns true (non-zero), then the signal handler must | |
2848 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
2849 // routine will never retun false (zero), but instead will execute a VM panic | |
2850 // routine kill the process. | |
2851 // | |
2852 // If this routine returns false, it is OK to call it again. This allows | |
2853 // the user-defined signal handler to perform checks either before or after | |
2854 // the VM performs its own checks. Naturally, the user code would be making | |
2855 // a serious error if it tried to handle an exception (such as a null check | |
2856 // or breakpoint) that the VM was generating for its own correct operation. | |
2857 // | |
2858 // This routine may recognize any of the following kinds of signals: | |
2859 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
2860 // It should be consulted by handlers for any of those signals. | |
2861 // | |
2862 // The caller of this routine must pass in the three arguments supplied | |
2863 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
2864 // field of the structure passed to sigaction(). This routine assumes that | |
2865 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
2866 // | |
2867 // Note that the VM will print warnings if it detects conflicting signal | |
2868 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
2869 // | |
2870 extern "C" JNIEXPORT int | |
2871 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
2872 void* ucontext, int abort_if_unrecognized); | |
2873 | |
2874 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
2875 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
2876 JVM_handle_bsd_signal(sig, info, uc, true); | |
2877 } | |
2878 | |
2879 | |
2880 // This boolean allows users to forward their own non-matching signals | |
2881 // to JVM_handle_bsd_signal, harmlessly. | |
2882 bool os::Bsd::signal_handlers_are_installed = false; | |
2883 | |
2884 // For signal-chaining | |
2885 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
2886 unsigned int os::Bsd::sigs = 0; | |
2887 bool os::Bsd::libjsig_is_loaded = false; | |
2888 typedef struct sigaction *(*get_signal_t)(int); | |
2889 get_signal_t os::Bsd::get_signal_action = NULL; | |
2890 | |
2891 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
2892 struct sigaction *actp = NULL; | |
2893 | |
2894 if (libjsig_is_loaded) { | |
2895 // Retrieve the old signal handler from libjsig | |
2896 actp = (*get_signal_action)(sig); | |
2897 } | |
2898 if (actp == NULL) { | |
2899 // Retrieve the preinstalled signal handler from jvm | |
2900 actp = get_preinstalled_handler(sig); | |
2901 } | |
2902 | |
2903 return actp; | |
2904 } | |
2905 | |
2906 static bool call_chained_handler(struct sigaction *actp, int sig, | |
2907 siginfo_t *siginfo, void *context) { | |
2908 // Call the old signal handler | |
2909 if (actp->sa_handler == SIG_DFL) { | |
2910 // It's more reasonable to let jvm treat it as an unexpected exception | |
2911 // instead of taking the default action. | |
2912 return false; | |
2913 } else if (actp->sa_handler != SIG_IGN) { | |
2914 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
2915 // automaticlly block the signal | |
2916 sigaddset(&(actp->sa_mask), sig); | |
2917 } | |
2918 | |
2919 sa_handler_t hand; | |
2920 sa_sigaction_t sa; | |
2921 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
2922 // retrieve the chained handler | |
2923 if (siginfo_flag_set) { | |
2924 sa = actp->sa_sigaction; | |
2925 } else { | |
2926 hand = actp->sa_handler; | |
2927 } | |
2928 | |
2929 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
2930 actp->sa_handler = SIG_DFL; | |
2931 } | |
2932 | |
2933 // try to honor the signal mask | |
2934 sigset_t oset; | |
2935 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
2936 | |
2937 // call into the chained handler | |
2938 if (siginfo_flag_set) { | |
2939 (*sa)(sig, siginfo, context); | |
2940 } else { | |
2941 (*hand)(sig); | |
2942 } | |
2943 | |
2944 // restore the signal mask | |
2945 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
2946 } | |
2947 // Tell jvm's signal handler the signal is taken care of. | |
2948 return true; | |
2949 } | |
2950 | |
2951 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
2952 bool chained = false; | |
2953 // signal-chaining | |
2954 if (UseSignalChaining) { | |
2955 struct sigaction *actp = get_chained_signal_action(sig); | |
2956 if (actp != NULL) { | |
2957 chained = call_chained_handler(actp, sig, siginfo, context); | |
2958 } | |
2959 } | |
2960 return chained; | |
2961 } | |
2962 | |
2963 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
2964 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
2965 return &sigact[sig]; | |
2966 } | |
2967 return NULL; | |
2968 } | |
2969 | |
2970 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
2971 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2972 sigact[sig] = oldAct; | |
2973 sigs |= (unsigned int)1 << sig; | |
2974 } | |
2975 | |
2976 // for diagnostic | |
2977 int os::Bsd::sigflags[MAXSIGNUM]; | |
2978 | |
2979 int os::Bsd::get_our_sigflags(int sig) { | |
2980 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2981 return sigflags[sig]; | |
2982 } | |
2983 | |
2984 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
2985 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2986 sigflags[sig] = flags; | |
2987 } | |
2988 | |
2989 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
2990 // Check for overwrite. | |
2991 struct sigaction oldAct; | |
2992 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
2993 | |
2994 void* oldhand = oldAct.sa_sigaction | |
2995 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
2996 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
2997 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
2998 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
2999 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3000 if (AllowUserSignalHandlers || !set_installed) { | |
3001 // Do not overwrite; user takes responsibility to forward to us. | |
3002 return; | |
3003 } else if (UseSignalChaining) { | |
3004 // save the old handler in jvm | |
3005 save_preinstalled_handler(sig, oldAct); | |
3006 // libjsig also interposes the sigaction() call below and saves the | |
3007 // old sigaction on it own. | |
3008 } else { | |
3009 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3010 "%#lx for signal %d.", (long)oldhand, sig)); | |
3011 } | |
3012 } | |
3013 | |
3014 struct sigaction sigAct; | |
3015 sigfillset(&(sigAct.sa_mask)); | |
3016 sigAct.sa_handler = SIG_DFL; | |
3017 if (!set_installed) { | |
3018 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3019 } else { | |
3020 sigAct.sa_sigaction = signalHandler; | |
3021 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3022 } | |
3023 // Save flags, which are set by ours | |
3024 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3025 sigflags[sig] = sigAct.sa_flags; | |
3026 | |
3027 int ret = sigaction(sig, &sigAct, &oldAct); | |
3028 assert(ret == 0, "check"); | |
3029 | |
3030 void* oldhand2 = oldAct.sa_sigaction | |
3031 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3032 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3033 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3034 } | |
3035 | |
3036 // install signal handlers for signals that HotSpot needs to | |
3037 // handle in order to support Java-level exception handling. | |
3038 | |
3039 void os::Bsd::install_signal_handlers() { | |
3040 if (!signal_handlers_are_installed) { | |
3041 signal_handlers_are_installed = true; | |
3042 | |
3043 // signal-chaining | |
3044 typedef void (*signal_setting_t)(); | |
3045 signal_setting_t begin_signal_setting = NULL; | |
3046 signal_setting_t end_signal_setting = NULL; | |
3047 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3048 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3049 if (begin_signal_setting != NULL) { | |
3050 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3051 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3052 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3053 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3054 libjsig_is_loaded = true; | |
3055 assert(UseSignalChaining, "should enable signal-chaining"); | |
3056 } | |
3057 if (libjsig_is_loaded) { | |
3058 // Tell libjsig jvm is setting signal handlers | |
3059 (*begin_signal_setting)(); | |
3060 } | |
3061 | |
3062 set_signal_handler(SIGSEGV, true); | |
3063 set_signal_handler(SIGPIPE, true); | |
3064 set_signal_handler(SIGBUS, true); | |
3065 set_signal_handler(SIGILL, true); | |
3066 set_signal_handler(SIGFPE, true); | |
3067 set_signal_handler(SIGXFSZ, true); | |
3068 | |
3069 #if defined(__APPLE__) | |
3070 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
3071 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
3072 // signal handler that's placed on our process by CrashReporter. This disables | |
3073 // CrashReporter-based reporting. | |
3074 // | |
3075 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
3076 // on caught fatal signals. | |
3077 // | |
3078 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
3079 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
3080 // exception handling, while leaving the standard BSD signal handlers functional. | |
3081 kern_return_t kr; | |
3082 kr = task_set_exception_ports(mach_task_self(), | |
3083 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
3084 MACH_PORT_NULL, | |
3085 EXCEPTION_STATE_IDENTITY, | |
3086 MACHINE_THREAD_STATE); | |
3087 | |
3088 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
3089 #endif | |
3090 | |
3091 if (libjsig_is_loaded) { | |
3092 // Tell libjsig jvm finishes setting signal handlers | |
3093 (*end_signal_setting)(); | |
3094 } | |
3095 | |
3096 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3097 // and if UserSignalHandler is installed all bets are off | |
3098 if (CheckJNICalls) { | |
3099 if (libjsig_is_loaded) { | |
3100 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
3101 check_signals = false; | |
3102 } | |
3103 if (AllowUserSignalHandlers) { | |
3104 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
3105 check_signals = false; | |
3106 } | |
3107 } | |
3108 } | |
3109 } | |
3110 | |
3111 | |
3112 ///// | |
3113 // glibc on Bsd platform uses non-documented flag | |
3114 // to indicate, that some special sort of signal | |
3115 // trampoline is used. | |
3116 // We will never set this flag, and we should | |
3117 // ignore this flag in our diagnostic | |
3118 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3119 #undef SIGNIFICANT_SIGNAL_MASK | |
3120 #endif | |
3121 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3122 | |
3123 static const char* get_signal_handler_name(address handler, | |
3124 char* buf, int buflen) { | |
3125 int offset; | |
3126 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3127 if (found) { | |
3128 // skip directory names | |
3129 const char *p1, *p2; | |
3130 p1 = buf; | |
3131 size_t len = strlen(os::file_separator()); | |
3132 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3133 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3134 } else { | |
3135 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3136 } | |
3137 return buf; | |
3138 } | |
3139 | |
3140 static void print_signal_handler(outputStream* st, int sig, | |
3141 char* buf, size_t buflen) { | |
3142 struct sigaction sa; | |
3143 | |
3144 sigaction(sig, NULL, &sa); | |
3145 | |
3146 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3147 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3148 | |
3149 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3150 | |
3151 address handler = (sa.sa_flags & SA_SIGINFO) | |
3152 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3153 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3154 | |
3155 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3156 st->print("SIG_DFL"); | |
3157 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3158 st->print("SIG_IGN"); | |
3159 } else { | |
3160 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3161 } | |
3162 | |
3163 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
3164 | |
3165 address rh = VMError::get_resetted_sighandler(sig); | |
3166 // May be, handler was resetted by VMError? | |
3167 if(rh != NULL) { | |
3168 handler = rh; | |
3169 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3170 } | |
3171 | |
3172 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
3173 | |
3174 // Check: is it our handler? | |
3175 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3176 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3177 // It is our signal handler | |
3178 // check for flags, reset system-used one! | |
3179 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3180 st->print( | |
3181 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3182 os::Bsd::get_our_sigflags(sig)); | |
3183 } | |
3184 } | |
3185 st->cr(); | |
3186 } | |
3187 | |
3188 | |
3189 #define DO_SIGNAL_CHECK(sig) \ | |
3190 if (!sigismember(&check_signal_done, sig)) \ | |
3191 os::Bsd::check_signal_handler(sig) | |
3192 | |
3193 // This method is a periodic task to check for misbehaving JNI applications | |
3194 // under CheckJNI, we can add any periodic checks here | |
3195 | |
3196 void os::run_periodic_checks() { | |
3197 | |
3198 if (check_signals == false) return; | |
3199 | |
3200 // SEGV and BUS if overridden could potentially prevent | |
3201 // generation of hs*.log in the event of a crash, debugging | |
3202 // such a case can be very challenging, so we absolutely | |
3203 // check the following for a good measure: | |
3204 DO_SIGNAL_CHECK(SIGSEGV); | |
3205 DO_SIGNAL_CHECK(SIGILL); | |
3206 DO_SIGNAL_CHECK(SIGFPE); | |
3207 DO_SIGNAL_CHECK(SIGBUS); | |
3208 DO_SIGNAL_CHECK(SIGPIPE); | |
3209 DO_SIGNAL_CHECK(SIGXFSZ); | |
3210 | |
3211 | |
3212 // ReduceSignalUsage allows the user to override these handlers | |
3213 // see comments at the very top and jvm_solaris.h | |
3214 if (!ReduceSignalUsage) { | |
3215 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3216 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3217 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3218 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3219 } | |
3220 | |
3221 DO_SIGNAL_CHECK(SR_signum); | |
3222 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3223 } | |
3224 | |
3225 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3226 | |
3227 static os_sigaction_t os_sigaction = NULL; | |
3228 | |
3229 void os::Bsd::check_signal_handler(int sig) { | |
3230 char buf[O_BUFLEN]; | |
3231 address jvmHandler = NULL; | |
3232 | |
3233 | |
3234 struct sigaction act; | |
3235 if (os_sigaction == NULL) { | |
3236 // only trust the default sigaction, in case it has been interposed | |
3237 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3238 if (os_sigaction == NULL) return; | |
3239 } | |
3240 | |
3241 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3242 | |
3243 | |
3244 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3245 | |
3246 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3247 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3248 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3249 | |
3250 | |
3251 switch(sig) { | |
3252 case SIGSEGV: | |
3253 case SIGBUS: | |
3254 case SIGFPE: | |
3255 case SIGPIPE: | |
3256 case SIGILL: | |
3257 case SIGXFSZ: | |
3258 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3259 break; | |
3260 | |
3261 case SHUTDOWN1_SIGNAL: | |
3262 case SHUTDOWN2_SIGNAL: | |
3263 case SHUTDOWN3_SIGNAL: | |
3264 case BREAK_SIGNAL: | |
3265 jvmHandler = (address)user_handler(); | |
3266 break; | |
3267 | |
3268 case INTERRUPT_SIGNAL: | |
3269 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3270 break; | |
3271 | |
3272 default: | |
3273 if (sig == SR_signum) { | |
3274 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3275 } else { | |
3276 return; | |
3277 } | |
3278 break; | |
3279 } | |
3280 | |
3281 if (thisHandler != jvmHandler) { | |
3282 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3283 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3284 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3285 // No need to check this sig any longer | |
3286 sigaddset(&check_signal_done, sig); | |
3287 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3288 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3289 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
3290 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3291 // No need to check this sig any longer | |
3292 sigaddset(&check_signal_done, sig); | |
3293 } | |
3294 | |
3295 // Dump all the signal | |
3296 if (sigismember(&check_signal_done, sig)) { | |
3297 print_signal_handlers(tty, buf, O_BUFLEN); | |
3298 } | |
3299 } | |
3300 | |
3301 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3302 | |
3303 extern bool signal_name(int signo, char* buf, size_t len); | |
3304 | |
3305 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3306 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3307 // signal | |
3308 if (!signal_name(exception_code, buf, size)) { | |
3309 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3310 } | |
3311 return buf; | |
3312 } else { | |
3313 return NULL; | |
3314 } | |
3315 } | |
3316 | |
3317 // this is called _before_ the most of global arguments have been parsed | |
3318 void os::init(void) { | |
3319 char dummy; /* used to get a guess on initial stack address */ | |
3320 // first_hrtime = gethrtime(); | |
3321 | |
3322 // With BsdThreads the JavaMain thread pid (primordial thread) | |
3323 // is different than the pid of the java launcher thread. | |
3324 // So, on Bsd, the launcher thread pid is passed to the VM | |
3325 // via the sun.java.launcher.pid property. | |
3326 // Use this property instead of getpid() if it was correctly passed. | |
3327 // See bug 6351349. | |
3328 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3329 | |
3330 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3331 | |
3332 clock_tics_per_sec = CLK_TCK; | |
3333 | |
3334 init_random(1234567); | |
3335 | |
3336 ThreadCritical::initialize(); | |
3337 | |
3338 Bsd::set_page_size(getpagesize()); | |
3339 if (Bsd::page_size() == -1) { | |
3340 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
3341 strerror(errno))); | |
3342 } | |
3343 init_page_sizes((size_t) Bsd::page_size()); | |
3344 | |
3345 Bsd::initialize_system_info(); | |
3346 | |
3347 // main_thread points to the aboriginal thread | |
3348 Bsd::_main_thread = pthread_self(); | |
3349 | |
3350 Bsd::clock_init(); | |
3351 initial_time_count = os::elapsed_counter(); | |
3352 | |
3353 #ifdef __APPLE__ | |
3354 // XXXDARWIN | |
3355 // Work around the unaligned VM callbacks in hotspot's | |
3356 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
3357 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
3358 // alignment when doing symbol lookup. To work around this, we force early | |
3359 // binding of all symbols now, thus binding when alignment is known-good. | |
3360 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
3361 #endif | |
3362 } | |
3363 | |
3364 // To install functions for atexit system call | |
3365 extern "C" { | |
3366 static void perfMemory_exit_helper() { | |
3367 perfMemory_exit(); | |
3368 } | |
3369 } | |
3370 | |
3371 // this is called _after_ the global arguments have been parsed | |
3372 jint os::init_2(void) | |
3373 { | |
3374 // Allocate a single page and mark it as readable for safepoint polling | |
3375 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3376 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
3377 | |
3378 os::set_polling_page( polling_page ); | |
3379 | |
3380 #ifndef PRODUCT | |
3381 if(Verbose && PrintMiscellaneous) | |
3382 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
3383 #endif | |
3384 | |
3385 if (!UseMembar) { | |
3386 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3387 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
3388 os::set_memory_serialize_page( mem_serialize_page ); | |
3389 | |
3390 #ifndef PRODUCT | |
3391 if(Verbose && PrintMiscellaneous) | |
3392 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3393 #endif | |
3394 } | |
3395 | |
3396 os::large_page_init(); | |
3397 | |
3398 // initialize suspend/resume support - must do this before signal_sets_init() | |
3399 if (SR_initialize() != 0) { | |
3400 perror("SR_initialize failed"); | |
3401 return JNI_ERR; | |
3402 } | |
3403 | |
3404 Bsd::signal_sets_init(); | |
3405 Bsd::install_signal_handlers(); | |
3406 | |
3407 // Check minimum allowable stack size for thread creation and to initialize | |
3408 // the java system classes, including StackOverflowError - depends on page | |
3409 // size. Add a page for compiler2 recursion in main thread. | |
3410 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3411 // class initialization depending on 32 or 64 bit VM. | |
3412 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
3413 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
3414 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
3415 | |
3416 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3417 if (threadStackSizeInBytes != 0 && | |
3418 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
3419 tty->print_cr("\nThe stack size specified is too small, " | |
3420 "Specify at least %dk", | |
3421 os::Bsd::min_stack_allowed/ K); | |
3422 return JNI_ERR; | |
3423 } | |
3424 | |
3425 // Make the stack size a multiple of the page size so that | |
3426 // the yellow/red zones can be guarded. | |
3427 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
3428 vm_page_size())); | |
3429 | |
3430 if (MaxFDLimit) { | |
3431 // set the number of file descriptors to max. print out error | |
3432 // if getrlimit/setrlimit fails but continue regardless. | |
3433 struct rlimit nbr_files; | |
3434 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3435 if (status != 0) { | |
3436 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3437 perror("os::init_2 getrlimit failed"); | |
3438 } else { | |
3439 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3440 | |
3441 #ifdef __APPLE__ | |
3442 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
3443 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
3444 // be used instead | |
3445 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
3446 #endif | |
3447 | |
3448 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3449 if (status != 0) { | |
3450 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3451 perror("os::init_2 setrlimit failed"); | |
3452 } | |
3453 } | |
3454 } | |
3455 | |
3456 // at-exit methods are called in the reverse order of their registration. | |
3457 // atexit functions are called on return from main or as a result of a | |
3458 // call to exit(3C). There can be only 32 of these functions registered | |
3459 // and atexit() does not set errno. | |
3460 | |
3461 if (PerfAllowAtExitRegistration) { | |
3462 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3463 // atexit functions can be delayed until process exit time, which | |
3464 // can be problematic for embedded VM situations. Embedded VMs should | |
3465 // call DestroyJavaVM() to assure that VM resources are released. | |
3466 | |
3467 // note: perfMemory_exit_helper atexit function may be removed in | |
3468 // the future if the appropriate cleanup code can be added to the | |
3469 // VM_Exit VMOperation's doit method. | |
3470 if (atexit(perfMemory_exit_helper) != 0) { | |
3471 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
3472 } | |
3473 } | |
3474 | |
3475 // initialize thread priority policy | |
3476 prio_init(); | |
3477 | |
4006 | 3478 #ifdef __APPLE__ |
3479 // dynamically link to objective c gc registration | |
3480 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
3481 if (handleLibObjc != NULL) { | |
3482 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
3483 } | |
3484 #endif | |
3485 | |
3960 | 3486 return JNI_OK; |
3487 } | |
3488 | |
3489 // this is called at the end of vm_initialization | |
3490 void os::init_3(void) { } | |
3491 | |
3492 // Mark the polling page as unreadable | |
3493 void os::make_polling_page_unreadable(void) { | |
3494 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
3495 fatal("Could not disable polling page"); | |
3496 }; | |
3497 | |
3498 // Mark the polling page as readable | |
3499 void os::make_polling_page_readable(void) { | |
3500 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
3501 fatal("Could not enable polling page"); | |
3502 } | |
3503 }; | |
3504 | |
3505 int os::active_processor_count() { | |
3506 return _processor_count; | |
3507 } | |
3508 | |
4006 | 3509 void os::set_native_thread_name(const char *name) { |
3510 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
3511 // This is only supported in Snow Leopard and beyond | |
3512 if (name != NULL) { | |
3513 // Add a "Java: " prefix to the name | |
3514 char buf[MAXTHREADNAMESIZE]; | |
3515 snprintf(buf, sizeof(buf), "Java: %s", name); | |
3516 pthread_setname_np(buf); | |
3517 } | |
3518 #endif | |
3519 } | |
3520 | |
3960 | 3521 bool os::distribute_processes(uint length, uint* distribution) { |
3522 // Not yet implemented. | |
3523 return false; | |
3524 } | |
3525 | |
3526 bool os::bind_to_processor(uint processor_id) { | |
3527 // Not yet implemented. | |
3528 return false; | |
3529 } | |
3530 | |
3531 /// | |
3532 | |
3533 // Suspends the target using the signal mechanism and then grabs the PC before | |
3534 // resuming the target. Used by the flat-profiler only | |
3535 ExtendedPC os::get_thread_pc(Thread* thread) { | |
3536 // Make sure that it is called by the watcher for the VMThread | |
3537 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
3538 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
3539 | |
3540 ExtendedPC epc; | |
3541 | |
3542 OSThread* osthread = thread->osthread(); | |
3543 if (do_suspend(osthread)) { | |
3544 if (osthread->ucontext() != NULL) { | |
3545 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); | |
3546 } else { | |
3547 // NULL context is unexpected, double-check this is the VMThread | |
3548 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
3549 } | |
3550 do_resume(osthread); | |
3551 } | |
3552 // failure means pthread_kill failed for some reason - arguably this is | |
3553 // a fatal problem, but such problems are ignored elsewhere | |
3554 | |
3555 return epc; | |
3556 } | |
3557 | |
3558 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
3559 { | |
3560 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
3561 } | |
3562 | |
3563 //////////////////////////////////////////////////////////////////////////////// | |
3564 // debug support | |
3565 | |
3566 static address same_page(address x, address y) { | |
3567 int page_bits = -os::vm_page_size(); | |
3568 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) | |
3569 return x; | |
3570 else if (x > y) | |
3571 return (address)(intptr_t(y) | ~page_bits) + 1; | |
3572 else | |
3573 return (address)(intptr_t(y) & page_bits); | |
3574 } | |
3575 | |
3576 bool os::find(address addr, outputStream* st) { | |
3577 Dl_info dlinfo; | |
3578 memset(&dlinfo, 0, sizeof(dlinfo)); | |
3579 if (dladdr(addr, &dlinfo)) { | |
3580 st->print(PTR_FORMAT ": ", addr); | |
3581 if (dlinfo.dli_sname != NULL) { | |
3582 st->print("%s+%#x", dlinfo.dli_sname, | |
3583 addr - (intptr_t)dlinfo.dli_saddr); | |
3584 } else if (dlinfo.dli_fname) { | |
3585 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
3586 } else { | |
3587 st->print("<absolute address>"); | |
3588 } | |
3589 if (dlinfo.dli_fname) { | |
3590 st->print(" in %s", dlinfo.dli_fname); | |
3591 } | |
3592 if (dlinfo.dli_fbase) { | |
3593 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
3594 } | |
3595 st->cr(); | |
3596 | |
3597 if (Verbose) { | |
3598 // decode some bytes around the PC | |
3599 address begin = same_page(addr-40, addr); | |
3600 address end = same_page(addr+40, addr); | |
3601 address lowest = (address) dlinfo.dli_sname; | |
3602 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
3603 if (begin < lowest) begin = lowest; | |
3604 Dl_info dlinfo2; | |
3605 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
3606 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
3607 end = (address) dlinfo2.dli_saddr; | |
3608 Disassembler::decode(begin, end, st); | |
3609 } | |
3610 return true; | |
3611 } | |
3612 return false; | |
3613 } | |
3614 | |
3615 //////////////////////////////////////////////////////////////////////////////// | |
3616 // misc | |
3617 | |
3618 // This does not do anything on Bsd. This is basically a hook for being | |
3619 // able to use structured exception handling (thread-local exception filters) | |
3620 // on, e.g., Win32. | |
3621 void | |
3622 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
3623 JavaCallArguments* args, Thread* thread) { | |
3624 f(value, method, args, thread); | |
3625 } | |
3626 | |
3627 void os::print_statistics() { | |
3628 } | |
3629 | |
3630 int os::message_box(const char* title, const char* message) { | |
3631 int i; | |
3632 fdStream err(defaultStream::error_fd()); | |
3633 for (i = 0; i < 78; i++) err.print_raw("="); | |
3634 err.cr(); | |
3635 err.print_raw_cr(title); | |
3636 for (i = 0; i < 78; i++) err.print_raw("-"); | |
3637 err.cr(); | |
3638 err.print_raw_cr(message); | |
3639 for (i = 0; i < 78; i++) err.print_raw("="); | |
3640 err.cr(); | |
3641 | |
3642 char buf[16]; | |
3643 // Prevent process from exiting upon "read error" without consuming all CPU | |
3644 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
3645 | |
3646 return buf[0] == 'y' || buf[0] == 'Y'; | |
3647 } | |
3648 | |
3649 int os::stat(const char *path, struct stat *sbuf) { | |
3650 char pathbuf[MAX_PATH]; | |
3651 if (strlen(path) > MAX_PATH - 1) { | |
3652 errno = ENAMETOOLONG; | |
3653 return -1; | |
3654 } | |
3655 os::native_path(strcpy(pathbuf, path)); | |
3656 return ::stat(pathbuf, sbuf); | |
3657 } | |
3658 | |
3659 bool os::check_heap(bool force) { | |
3660 return true; | |
3661 } | |
3662 | |
3663 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
3664 return ::vsnprintf(buf, count, format, args); | |
3665 } | |
3666 | |
3667 // Is a (classpath) directory empty? | |
3668 bool os::dir_is_empty(const char* path) { | |
3669 DIR *dir = NULL; | |
3670 struct dirent *ptr; | |
3671 | |
3672 dir = opendir(path); | |
3673 if (dir == NULL) return true; | |
3674 | |
3675 /* Scan the directory */ | |
3676 bool result = true; | |
3677 char buf[sizeof(struct dirent) + MAX_PATH]; | |
3678 while (result && (ptr = ::readdir(dir)) != NULL) { | |
3679 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
3680 result = false; | |
3681 } | |
3682 } | |
3683 closedir(dir); | |
3684 return result; | |
3685 } | |
3686 | |
3687 // This code originates from JDK's sysOpen and open64_w | |
3688 // from src/solaris/hpi/src/system_md.c | |
3689 | |
3690 #ifndef O_DELETE | |
3691 #define O_DELETE 0x10000 | |
3692 #endif | |
3693 | |
3694 // Open a file. Unlink the file immediately after open returns | |
3695 // if the specified oflag has the O_DELETE flag set. | |
3696 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
3697 | |
3698 int os::open(const char *path, int oflag, int mode) { | |
3699 | |
3700 if (strlen(path) > MAX_PATH - 1) { | |
3701 errno = ENAMETOOLONG; | |
3702 return -1; | |
3703 } | |
3704 int fd; | |
3705 int o_delete = (oflag & O_DELETE); | |
3706 oflag = oflag & ~O_DELETE; | |
3707 | |
3708 fd = ::open(path, oflag, mode); | |
3709 if (fd == -1) return -1; | |
3710 | |
3711 //If the open succeeded, the file might still be a directory | |
3712 { | |
3713 struct stat buf; | |
3714 int ret = ::fstat(fd, &buf); | |
3715 int st_mode = buf.st_mode; | |
3716 | |
3717 if (ret != -1) { | |
3718 if ((st_mode & S_IFMT) == S_IFDIR) { | |
3719 errno = EISDIR; | |
3720 ::close(fd); | |
3721 return -1; | |
3722 } | |
3723 } else { | |
3724 ::close(fd); | |
3725 return -1; | |
3726 } | |
3727 } | |
3728 | |
3729 /* | |
3730 * All file descriptors that are opened in the JVM and not | |
3731 * specifically destined for a subprocess should have the | |
3732 * close-on-exec flag set. If we don't set it, then careless 3rd | |
3733 * party native code might fork and exec without closing all | |
3734 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
3735 * UNIXProcess.c), and this in turn might: | |
3736 * | |
3737 * - cause end-of-file to fail to be detected on some file | |
3738 * descriptors, resulting in mysterious hangs, or | |
3739 * | |
3740 * - might cause an fopen in the subprocess to fail on a system | |
3741 * suffering from bug 1085341. | |
3742 * | |
3743 * (Yes, the default setting of the close-on-exec flag is a Unix | |
3744 * design flaw) | |
3745 * | |
3746 * See: | |
3747 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
3748 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
3749 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
3750 */ | |
3751 #ifdef FD_CLOEXEC | |
3752 { | |
3753 int flags = ::fcntl(fd, F_GETFD); | |
3754 if (flags != -1) | |
3755 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
3756 } | |
3757 #endif | |
3758 | |
3759 if (o_delete != 0) { | |
3760 ::unlink(path); | |
3761 } | |
3762 return fd; | |
3763 } | |
3764 | |
3765 | |
3766 // create binary file, rewriting existing file if required | |
3767 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
3768 int oflags = O_WRONLY | O_CREAT; | |
3769 if (!rewrite_existing) { | |
3770 oflags |= O_EXCL; | |
3771 } | |
3772 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
3773 } | |
3774 | |
3775 // return current position of file pointer | |
3776 jlong os::current_file_offset(int fd) { | |
3777 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
3778 } | |
3779 | |
3780 // move file pointer to the specified offset | |
3781 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
3782 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
3783 } | |
3784 | |
3785 // This code originates from JDK's sysAvailable | |
3786 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
3787 | |
3788 int os::available(int fd, jlong *bytes) { | |
3789 jlong cur, end; | |
3790 int mode; | |
3791 struct stat buf; | |
3792 | |
3793 if (::fstat(fd, &buf) >= 0) { | |
3794 mode = buf.st_mode; | |
3795 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
3796 /* | |
3797 * XXX: is the following call interruptible? If so, this might | |
3798 * need to go through the INTERRUPT_IO() wrapper as for other | |
3799 * blocking, interruptible calls in this file. | |
3800 */ | |
3801 int n; | |
3802 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
3803 *bytes = n; | |
3804 return 1; | |
3805 } | |
3806 } | |
3807 } | |
3808 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
3809 return 0; | |
3810 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
3811 return 0; | |
3812 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
3813 return 0; | |
3814 } | |
3815 *bytes = end - cur; | |
3816 return 1; | |
3817 } | |
3818 | |
3819 int os::socket_available(int fd, jint *pbytes) { | |
3820 if (fd < 0) | |
3821 return OS_OK; | |
3822 | |
3823 int ret; | |
3824 | |
3825 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
3826 | |
3827 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
3828 // is expected to return 0 on failure and 1 on success to the jdk. | |
3829 | |
3830 return (ret == OS_ERR) ? 0 : 1; | |
3831 } | |
3832 | |
3833 // Map a block of memory. | |
6197 | 3834 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 3835 char *addr, size_t bytes, bool read_only, |
3836 bool allow_exec) { | |
3837 int prot; | |
3838 int flags; | |
3839 | |
3840 if (read_only) { | |
3841 prot = PROT_READ; | |
3842 flags = MAP_SHARED; | |
3843 } else { | |
3844 prot = PROT_READ | PROT_WRITE; | |
3845 flags = MAP_PRIVATE; | |
3846 } | |
3847 | |
3848 if (allow_exec) { | |
3849 prot |= PROT_EXEC; | |
3850 } | |
3851 | |
3852 if (addr != NULL) { | |
3853 flags |= MAP_FIXED; | |
3854 } | |
3855 | |
3856 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
3857 fd, file_offset); | |
3858 if (mapped_address == MAP_FAILED) { | |
3859 return NULL; | |
3860 } | |
3861 return mapped_address; | |
3862 } | |
3863 | |
3864 | |
3865 // Remap a block of memory. | |
6197 | 3866 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 3867 char *addr, size_t bytes, bool read_only, |
3868 bool allow_exec) { | |
3869 // same as map_memory() on this OS | |
3870 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
3871 allow_exec); | |
3872 } | |
3873 | |
3874 | |
3875 // Unmap a block of memory. | |
6197 | 3876 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
3960 | 3877 return munmap(addr, bytes) == 0; |
3878 } | |
3879 | |
3880 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
3881 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
3882 // of a thread. | |
3883 // | |
3884 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
3885 // the fast estimate available on the platform. | |
3886 | |
3887 jlong os::current_thread_cpu_time() { | |
3888 #ifdef __APPLE__ | |
3889 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
3890 #endif | |
3891 } | |
3892 | |
3893 jlong os::thread_cpu_time(Thread* thread) { | |
3894 } | |
3895 | |
3896 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
3897 #ifdef __APPLE__ | |
3898 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
3899 #endif | |
3900 } | |
3901 | |
3902 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
3903 #ifdef __APPLE__ | |
3904 struct thread_basic_info tinfo; | |
3905 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
3906 kern_return_t kr; | |
4961
0368109684cb
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4960
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|
3907 thread_t mach_thread; |
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4960
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|
3908 |
0368109684cb
7132070: Use a mach_port_t as the OSThread thread_id rather than pthread_t on BSD/OSX
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|
3909 mach_thread = thread->osthread()->thread_id(); |
3960 | 3910 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
3911 if (kr != KERN_SUCCESS) | |
3912 return -1; | |
3913 | |
3914 if (user_sys_cpu_time) { | |
3915 jlong nanos; | |
3916 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
3917 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
3918 return nanos; | |
3919 } else { | |
3920 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
3921 } | |
3922 #endif | |
3923 } | |
3924 | |
3925 | |
3926 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
3927 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
3928 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
3929 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
3930 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
3931 } | |
3932 | |
3933 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
3934 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
3935 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
3936 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
3937 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
3938 } | |
3939 | |
3940 bool os::is_thread_cpu_time_supported() { | |
3941 #ifdef __APPLE__ | |
3942 return true; | |
6918 | 3943 #else |
3960 | 3944 return false; |
3945 #endif | |
3946 } | |
3947 | |
3948 // System loadavg support. Returns -1 if load average cannot be obtained. | |
3949 // Bsd doesn't yet have a (official) notion of processor sets, | |
3950 // so just return the system wide load average. | |
3951 int os::loadavg(double loadavg[], int nelem) { | |
3952 return ::getloadavg(loadavg, nelem); | |
3953 } | |
3954 | |
3955 void os::pause() { | |
3956 char filename[MAX_PATH]; | |
3957 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
3958 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
3959 } else { | |
3960 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
3961 } | |
3962 | |
3963 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
3964 if (fd != -1) { | |
3965 struct stat buf; | |
3966 ::close(fd); | |
3967 while (::stat(filename, &buf) == 0) { | |
3968 (void)::poll(NULL, 0, 100); | |
3969 } | |
3970 } else { | |
3971 jio_fprintf(stderr, | |
3972 "Could not open pause file '%s', continuing immediately.\n", filename); | |
3973 } | |
3974 } | |
3975 | |
3976 | |
3977 // Refer to the comments in os_solaris.cpp park-unpark. | |
3978 // | |
3979 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
3980 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
3981 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
3982 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
3983 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
3984 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
3985 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
3986 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
3987 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
3988 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
3989 // of libpthread avoids the problem, but isn't practical. | |
3990 // | |
3991 // Possible remedies: | |
3992 // | |
3993 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
3994 // This is palliative and probabilistic, however. If the thread is preempted | |
3995 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
3996 // than the minimum period may have passed, and the abstime may be stale (in the | |
3997 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
3998 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
3999 // | |
4000 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4001 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4002 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4003 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4004 // thread. | |
4005 // | |
4006 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4007 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4008 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4009 // This also works well. In fact it avoids kernel-level scalability impediments | |
4010 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4011 // timers in a graceful fashion. | |
4012 // | |
4013 // 4. When the abstime value is in the past it appears that control returns | |
4014 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4015 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4016 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4017 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4018 // It may be possible to avoid reinitialization by checking the return | |
4019 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4020 // condvar we must establish the invariant that cond_signal() is only called | |
4021 // within critical sections protected by the adjunct mutex. This prevents | |
4022 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4023 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4024 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4025 // | |
4026 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4027 // structure when a condvar is used or initialized. cond_destroy() would | |
4028 // release the helper structure. Our reinitialize-after-timedwait fix | |
4029 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4030 // | |
4031 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4032 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4033 // and only enabling the work-around for vulnerable environments. | |
4034 | |
4035 // utility to compute the abstime argument to timedwait: | |
4036 // millis is the relative timeout time | |
4037 // abstime will be the absolute timeout time | |
4038 // TODO: replace compute_abstime() with unpackTime() | |
4039 | |
4040 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
4041 if (millis < 0) millis = 0; | |
4042 struct timeval now; | |
4043 int status = gettimeofday(&now, NULL); | |
4044 assert(status == 0, "gettimeofday"); | |
4045 jlong seconds = millis / 1000; | |
4046 millis %= 1000; | |
4047 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4048 seconds = 50000000; | |
4049 } | |
4050 abstime->tv_sec = now.tv_sec + seconds; | |
4051 long usec = now.tv_usec + millis * 1000; | |
4052 if (usec >= 1000000) { | |
4053 abstime->tv_sec += 1; | |
4054 usec -= 1000000; | |
4055 } | |
4056 abstime->tv_nsec = usec * 1000; | |
4057 return abstime; | |
4058 } | |
4059 | |
4060 | |
4061 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4062 // Conceptually TryPark() should be equivalent to park(0). | |
4063 | |
4064 int os::PlatformEvent::TryPark() { | |
4065 for (;;) { | |
4066 const int v = _Event ; | |
4067 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4068 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4069 } | |
4070 } | |
4071 | |
4072 void os::PlatformEvent::park() { // AKA "down()" | |
4073 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4074 // may call park(). | |
4075 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4076 int v ; | |
4077 for (;;) { | |
4078 v = _Event ; | |
4079 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4080 } | |
4081 guarantee (v >= 0, "invariant") ; | |
4082 if (v == 0) { | |
4083 // Do this the hard way by blocking ... | |
4084 int status = pthread_mutex_lock(_mutex); | |
4085 assert_status(status == 0, status, "mutex_lock"); | |
4086 guarantee (_nParked == 0, "invariant") ; | |
4087 ++ _nParked ; | |
4088 while (_Event < 0) { | |
4089 status = pthread_cond_wait(_cond, _mutex); | |
4090 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4091 // Treat this the same as if the wait was interrupted | |
4092 if (status == ETIMEDOUT) { status = EINTR; } | |
4093 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4094 } | |
4095 -- _nParked ; | |
4096 | |
4097 _Event = 0 ; | |
4098 status = pthread_mutex_unlock(_mutex); | |
4099 assert_status(status == 0, status, "mutex_unlock"); | |
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4100 // Paranoia to ensure our locked and lock-free paths interact |
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4101 // correctly with each other. |
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4102 OrderAccess::fence(); |
3960 | 4103 } |
4104 guarantee (_Event >= 0, "invariant") ; | |
4105 } | |
4106 | |
4107 int os::PlatformEvent::park(jlong millis) { | |
4108 guarantee (_nParked == 0, "invariant") ; | |
4109 | |
4110 int v ; | |
4111 for (;;) { | |
4112 v = _Event ; | |
4113 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4114 } | |
4115 guarantee (v >= 0, "invariant") ; | |
4116 if (v != 0) return OS_OK ; | |
4117 | |
4118 // We do this the hard way, by blocking the thread. | |
4119 // Consider enforcing a minimum timeout value. | |
4120 struct timespec abst; | |
4121 compute_abstime(&abst, millis); | |
4122 | |
4123 int ret = OS_TIMEOUT; | |
4124 int status = pthread_mutex_lock(_mutex); | |
4125 assert_status(status == 0, status, "mutex_lock"); | |
4126 guarantee (_nParked == 0, "invariant") ; | |
4127 ++_nParked ; | |
4128 | |
4129 // Object.wait(timo) will return because of | |
4130 // (a) notification | |
4131 // (b) timeout | |
4132 // (c) thread.interrupt | |
4133 // | |
4134 // Thread.interrupt and object.notify{All} both call Event::set. | |
4135 // That is, we treat thread.interrupt as a special case of notification. | |
4136 // The underlying Solaris implementation, cond_timedwait, admits | |
4137 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4138 // JVM from making those visible to Java code. As such, we must | |
4139 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4140 // | |
4141 // TODO: properly differentiate simultaneous notify+interrupt. | |
4142 // In that case, we should propagate the notify to another waiter. | |
4143 | |
4144 while (_Event < 0) { | |
4145 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
4146 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4147 pthread_cond_destroy (_cond); | |
4148 pthread_cond_init (_cond, NULL) ; | |
4149 } | |
4150 assert_status(status == 0 || status == EINTR || | |
4151 status == ETIMEDOUT, | |
4152 status, "cond_timedwait"); | |
4153 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4154 if (status == ETIMEDOUT) break ; | |
4155 // We consume and ignore EINTR and spurious wakeups. | |
4156 } | |
4157 --_nParked ; | |
4158 if (_Event >= 0) { | |
4159 ret = OS_OK; | |
4160 } | |
4161 _Event = 0 ; | |
4162 status = pthread_mutex_unlock(_mutex); | |
4163 assert_status(status == 0, status, "mutex_unlock"); | |
4164 assert (_nParked == 0, "invariant") ; | |
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4165 // Paranoia to ensure our locked and lock-free paths interact |
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4166 // correctly with each other. |
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4167 OrderAccess::fence(); |
3960 | 4168 return ret; |
4169 } | |
4170 | |
4171 void os::PlatformEvent::unpark() { | |
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4172 // Transitions for _Event: |
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4173 // 0 :=> 1 |
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4174 // 1 :=> 1 |
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4175 // -1 :=> either 0 or 1; must signal target thread |
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4176 // That is, we can safely transition _Event from -1 to either |
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4177 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4178 // unpark() calls. |
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4179 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4180 // |
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4181 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4182 // that it will take two back-to-back park() calls for the owning |
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4183 // thread to block. This has the benefit of forcing a spurious return |
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4184 // from the first park() call after an unpark() call which will help |
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4185 // shake out uses of park() and unpark() without condition variables. |
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4186 |
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4187 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4188 |
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4189 // Wait for the thread associated with the event to vacate |
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4190 int status = pthread_mutex_lock(_mutex); |
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4191 assert_status(status == 0, status, "mutex_lock"); |
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4192 int AnyWaiters = _nParked; |
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4193 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4194 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4195 AnyWaiters = 0; |
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4196 pthread_cond_signal(_cond); |
3960 | 4197 } |
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4198 status = pthread_mutex_unlock(_mutex); |
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4199 assert_status(status == 0, status, "mutex_unlock"); |
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4200 if (AnyWaiters != 0) { |
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4201 status = pthread_cond_signal(_cond); |
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4202 assert_status(status == 0, status, "cond_signal"); |
3960 | 4203 } |
4204 | |
4205 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4206 // This is safe and avoids a common class of futile wakeups. In rare | |
4207 // circumstances this can cause a thread to return prematurely from | |
4208 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4209 // simply re-test the condition and re-park itself. | |
4210 } | |
4211 | |
4212 | |
4213 // JSR166 | |
4214 // ------------------------------------------------------- | |
4215 | |
4216 /* | |
4217 * The solaris and bsd implementations of park/unpark are fairly | |
4218 * conservative for now, but can be improved. They currently use a | |
4219 * mutex/condvar pair, plus a a count. | |
4220 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4221 * sets count to 1 and signals condvar. Only one thread ever waits | |
4222 * on the condvar. Contention seen when trying to park implies that someone | |
4223 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4224 * is no need to track notifications. | |
4225 */ | |
4226 | |
4227 #define MAX_SECS 100000000 | |
4228 /* | |
4229 * This code is common to bsd and solaris and will be moved to a | |
4230 * common place in dolphin. | |
4231 * | |
4232 * The passed in time value is either a relative time in nanoseconds | |
4233 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4234 * into suitable seconds and nanoseconds components and stored in the | |
4235 * given timespec structure. | |
4236 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4237 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
4238 * overflow if times way in the future are given. Further on Solaris versions | |
4239 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4240 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
4241 * As it will be 28 years before "now + 100000000" will overflow we can | |
4242 * ignore overflow and just impose a hard-limit on seconds using the value | |
4243 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4244 * years from "now". | |
4245 */ | |
4246 | |
4247 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
4248 assert (time > 0, "convertTime"); | |
4249 | |
4250 struct timeval now; | |
4251 int status = gettimeofday(&now, NULL); | |
4252 assert(status == 0, "gettimeofday"); | |
4253 | |
4254 time_t max_secs = now.tv_sec + MAX_SECS; | |
4255 | |
4256 if (isAbsolute) { | |
4257 jlong secs = time / 1000; | |
4258 if (secs > max_secs) { | |
4259 absTime->tv_sec = max_secs; | |
4260 } | |
4261 else { | |
4262 absTime->tv_sec = secs; | |
4263 } | |
4264 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4265 } | |
4266 else { | |
4267 jlong secs = time / NANOSECS_PER_SEC; | |
4268 if (secs >= MAX_SECS) { | |
4269 absTime->tv_sec = max_secs; | |
4270 absTime->tv_nsec = 0; | |
4271 } | |
4272 else { | |
4273 absTime->tv_sec = now.tv_sec + secs; | |
4274 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4275 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4276 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4277 ++absTime->tv_sec; // note: this must be <= max_secs | |
4278 } | |
4279 } | |
4280 } | |
4281 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4282 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4283 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4284 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4285 } | |
4286 | |
4287 void Parker::park(bool isAbsolute, jlong time) { | |
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4288 // Ideally we'd do something useful while spinning, such |
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4289 // as calling unpackTime(). |
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4290 |
3960 | 4291 // Optional fast-path check: |
4292 // Return immediately if a permit is available. | |
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4293 // We depend on Atomic::xchg() having full barrier semantics |
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4294 // since we are doing a lock-free update to _counter. |
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4295 if (Atomic::xchg(0, &_counter) > 0) return; |
3960 | 4296 |
4297 Thread* thread = Thread::current(); | |
4298 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4299 JavaThread *jt = (JavaThread *)thread; | |
4300 | |
4301 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4302 // Check interrupt before trying to wait | |
4303 if (Thread::is_interrupted(thread, false)) { | |
4304 return; | |
4305 } | |
4306 | |
4307 // Next, demultiplex/decode time arguments | |
4308 struct timespec absTime; | |
4309 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
4310 return; | |
4311 } | |
4312 if (time > 0) { | |
4313 unpackTime(&absTime, isAbsolute, time); | |
4314 } | |
4315 | |
4316 | |
4317 // Enter safepoint region | |
4318 // Beware of deadlocks such as 6317397. | |
4319 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4320 // In particular a thread must never block on the Threads_lock while | |
4321 // holding the Parker:: mutex. If safepoints are pending both the | |
4322 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4323 ThreadBlockInVM tbivm(jt); | |
4324 | |
4325 // Don't wait if cannot get lock since interference arises from | |
4326 // unblocking. Also. check interrupt before trying wait | |
4327 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4328 return; | |
4329 } | |
4330 | |
4331 int status ; | |
4332 if (_counter > 0) { // no wait needed | |
4333 _counter = 0; | |
4334 status = pthread_mutex_unlock(_mutex); | |
4335 assert (status == 0, "invariant") ; | |
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4336 // Paranoia to ensure our locked and lock-free paths interact |
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4337 // correctly with each other and Java-level accesses. |
3960 | 4338 OrderAccess::fence(); |
4339 return; | |
4340 } | |
4341 | |
4342 #ifdef ASSERT | |
4343 // Don't catch signals while blocked; let the running threads have the signals. | |
4344 // (This allows a debugger to break into the running thread.) | |
4345 sigset_t oldsigs; | |
4346 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
4347 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4348 #endif | |
4349 | |
4350 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
4351 jt->set_suspend_equivalent(); | |
4352 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
4353 | |
4354 if (time == 0) { | |
4355 status = pthread_cond_wait (_cond, _mutex) ; | |
4356 } else { | |
4357 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
4358 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4359 pthread_cond_destroy (_cond) ; | |
4360 pthread_cond_init (_cond, NULL); | |
4361 } | |
4362 } | |
4363 assert_status(status == 0 || status == EINTR || | |
4364 status == ETIMEDOUT, | |
4365 status, "cond_timedwait"); | |
4366 | |
4367 #ifdef ASSERT | |
4368 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
4369 #endif | |
4370 | |
4371 _counter = 0 ; | |
4372 status = pthread_mutex_unlock(_mutex) ; | |
4373 assert_status(status == 0, status, "invariant") ; | |
7629
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4374 // Paranoia to ensure our locked and lock-free paths interact |
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4375 // correctly with each other and Java-level accesses. |
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4376 OrderAccess::fence(); |
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4377 |
3960 | 4378 // If externally suspended while waiting, re-suspend |
4379 if (jt->handle_special_suspend_equivalent_condition()) { | |
4380 jt->java_suspend_self(); | |
4381 } | |
4382 } | |
4383 | |
4384 void Parker::unpark() { | |
4385 int s, status ; | |
4386 status = pthread_mutex_lock(_mutex); | |
4387 assert (status == 0, "invariant") ; | |
4388 s = _counter; | |
4389 _counter = 1; | |
4390 if (s < 1) { | |
4391 if (WorkAroundNPTLTimedWaitHang) { | |
4392 status = pthread_cond_signal (_cond) ; | |
4393 assert (status == 0, "invariant") ; | |
4394 status = pthread_mutex_unlock(_mutex); | |
4395 assert (status == 0, "invariant") ; | |
4396 } else { | |
4397 status = pthread_mutex_unlock(_mutex); | |
4398 assert (status == 0, "invariant") ; | |
4399 status = pthread_cond_signal (_cond) ; | |
4400 assert (status == 0, "invariant") ; | |
4401 } | |
4402 } else { | |
4403 pthread_mutex_unlock(_mutex); | |
4404 assert (status == 0, "invariant") ; | |
4405 } | |
4406 } | |
4407 | |
4408 | |
4409 /* Darwin has no "environ" in a dynamic library. */ | |
4410 #ifdef __APPLE__ | |
4411 #include <crt_externs.h> | |
4412 #define environ (*_NSGetEnviron()) | |
4413 #else | |
4414 extern char** environ; | |
4415 #endif | |
4416 | |
4417 // Run the specified command in a separate process. Return its exit value, | |
4418 // or -1 on failure (e.g. can't fork a new process). | |
4419 // Unlike system(), this function can be called from signal handler. It | |
4420 // doesn't block SIGINT et al. | |
4421 int os::fork_and_exec(char* cmd) { | |
4422 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
4423 | |
4424 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
4425 // pthread_atfork handlers and reset pthread library. All we need is a | |
4426 // separate process to execve. Make a direct syscall to fork process. | |
4427 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
4428 // the best... | |
4429 pid_t pid = fork(); | |
4430 | |
4431 if (pid < 0) { | |
4432 // fork failed | |
4433 return -1; | |
4434 | |
4435 } else if (pid == 0) { | |
4436 // child process | |
4437 | |
4438 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
4439 // first to kill every thread on the thread list. Because this list is | |
4440 // not reset by fork() (see notes above), execve() will instead kill | |
4441 // every thread in the parent process. We know this is the only thread | |
4442 // in the new process, so make a system call directly. | |
4443 // IA64 should use normal execve() from glibc to match the glibc fork() | |
4444 // above. | |
4445 execve("/bin/sh", (char* const*)argv, environ); | |
4446 | |
4447 // execve failed | |
4448 _exit(-1); | |
4449 | |
4450 } else { | |
4451 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
4452 // care about the actual exit code, for now. | |
4453 | |
4454 int status; | |
4455 | |
4456 // Wait for the child process to exit. This returns immediately if | |
4457 // the child has already exited. */ | |
4458 while (waitpid(pid, &status, 0) < 0) { | |
4459 switch (errno) { | |
4460 case ECHILD: return 0; | |
4461 case EINTR: break; | |
4462 default: return -1; | |
4463 } | |
4464 } | |
4465 | |
4466 if (WIFEXITED(status)) { | |
4467 // The child exited normally; get its exit code. | |
4468 return WEXITSTATUS(status); | |
4469 } else if (WIFSIGNALED(status)) { | |
4470 // The child exited because of a signal | |
4471 // The best value to return is 0x80 + signal number, | |
4472 // because that is what all Unix shells do, and because | |
4473 // it allows callers to distinguish between process exit and | |
4474 // process death by signal. | |
4475 return 0x80 + WTERMSIG(status); | |
4476 } else { | |
4477 // Unknown exit code; pass it through | |
4478 return status; | |
4479 } | |
4480 } | |
4481 } | |
4482 | |
4483 // is_headless_jre() | |
4484 // | |
4082
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4485 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
3960 | 4486 // in order to report if we are running in a headless jre |
4487 // | |
4082
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4488 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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4489 // as libawt.so, and renamed libawt_xawt.so |
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4490 // |
3960 | 4491 bool os::is_headless_jre() { |
4492 struct stat statbuf; | |
4493 char buf[MAXPATHLEN]; | |
4494 char libmawtpath[MAXPATHLEN]; | |
4006 | 4495 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
5921 | 4496 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
3960 | 4497 char *p; |
4498 | |
4499 // Get path to libjvm.so | |
4500 os::jvm_path(buf, sizeof(buf)); | |
4501 | |
4502 // Get rid of libjvm.so | |
4503 p = strrchr(buf, '/'); | |
4504 if (p == NULL) return false; | |
4505 else *p = '\0'; | |
4506 | |
4507 // Get rid of client or server | |
4508 p = strrchr(buf, '/'); | |
4509 if (p == NULL) return false; | |
4510 else *p = '\0'; | |
4511 | |
4512 // check xawt/libmawt.so | |
4513 strcpy(libmawtpath, buf); | |
4514 strcat(libmawtpath, xawtstr); | |
4515 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
4516 | |
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4517 // check libawt_xawt.so |
3960 | 4518 strcpy(libmawtpath, buf); |
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4519 strcat(libmawtpath, new_xawtstr); |
3960 | 4520 if (::stat(libmawtpath, &statbuf) == 0) return false; |
4521 | |
4522 return true; | |
4523 } | |
6200
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4524 |
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4525 // Get the default path to the core file |
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4526 // Returns the length of the string |
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4527 int os::get_core_path(char* buffer, size_t bufferSize) { |
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4528 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
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4529 |
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4530 // Truncate if theoretical string was longer than bufferSize |
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4531 n = MIN2(n, (int)bufferSize); |
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4532 |
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4533 return n; |
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4534 } |