Mercurial > hg > graal-compiler
annotate src/os/bsd/vm/os_bsd.cpp @ 7456:7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
Summary: Phase 2 is removing '_g' support from the Runtime code.
Reviewed-by: dcubed, coleenp, hseigel
Contributed-by: ron.durbin@oracle.com
author | dcubed |
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date | Wed, 19 Dec 2012 10:35:08 -0800 |
parents | d2f8c38e543d |
children | 989155e2d07a c07c102cbad7 |
rev | line source |
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3960 | 1 /* |
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2 * Copyright (c) 1999, 2012, 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; | |
246 u_long mem_val; | |
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) { | |
253 set_processor_count(cpu_val); | |
254 } | |
255 else { | |
256 set_processor_count(1); // fallback | |
257 } | |
258 | |
259 /* get physical memory via hw.usermem sysctl (hw.usermem is used | |
260 * instead of hw.physmem because we need size of allocatable memory | |
261 */ | |
262 mib[0] = CTL_HW; | |
263 mib[1] = HW_USERMEM; | |
264 len = sizeof(mem_val); | |
265 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) | |
266 _physical_memory = mem_val; | |
267 else | |
268 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) | |
269 | |
270 #ifdef __OpenBSD__ | |
271 { | |
272 // limit _physical_memory memory view on OpenBSD since | |
273 // datasize rlimit restricts us anyway. | |
274 struct rlimit limits; | |
275 getrlimit(RLIMIT_DATA, &limits); | |
276 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
277 } | |
278 #endif | |
279 } | |
280 | |
4006 | 281 #ifdef __APPLE__ |
282 static const char *get_home() { | |
283 const char *home_dir = ::getenv("HOME"); | |
284 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
285 struct passwd *passwd_info = getpwuid(geteuid()); | |
286 if (passwd_info != NULL) { | |
287 home_dir = passwd_info->pw_dir; | |
288 } | |
289 } | |
290 | |
291 return home_dir; | |
292 } | |
293 #endif | |
294 | |
3960 | 295 void os::init_system_properties_values() { |
296 // char arch[12]; | |
297 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
298 | |
299 // The next steps are taken in the product version: | |
300 // | |
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301 // Obtain the JAVA_HOME value from the location of libjvm.so. |
3960 | 302 // This library should be located at: |
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303 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
3960 | 304 // |
305 // If "/jre/lib/" appears at the right place in the path, then we | |
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306 // assume libjvm.so is installed in a JDK and we use this path. |
3960 | 307 // |
308 // Otherwise exit with message: "Could not create the Java virtual machine." | |
309 // | |
310 // The following extra steps are taken in the debugging version: | |
311 // | |
312 // If "/jre/lib/" does NOT appear at the right place in the path | |
313 // instead of exit check for $JAVA_HOME environment variable. | |
314 // | |
315 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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316 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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317 // it looks like libjvm.so is installed there |
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318 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
3960 | 319 // |
320 // Otherwise exit. | |
321 // | |
322 // Important note: if the location of libjvm.so changes this | |
323 // code needs to be changed accordingly. | |
324 | |
325 // The next few definitions allow the code to be verbatim: | |
6197 | 326 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
3960 | 327 #define getenv(n) ::getenv(n) |
328 | |
329 /* | |
330 * See ld(1): | |
331 * The linker uses the following search paths to locate required | |
332 * shared libraries: | |
333 * 1: ... | |
334 * ... | |
335 * 7: The default directories, normally /lib and /usr/lib. | |
336 */ | |
337 #ifndef DEFAULT_LIBPATH | |
338 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
339 #endif | |
340 | |
341 #define EXTENSIONS_DIR "/lib/ext" | |
342 #define ENDORSED_DIR "/lib/endorsed" | |
343 #define REG_DIR "/usr/java/packages" | |
344 | |
4006 | 345 #ifdef __APPLE__ |
346 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
347 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
348 const char *user_home_dir = get_home(); | |
349 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
350 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
351 sizeof(SYS_EXTENSIONS_DIRS); | |
352 #endif | |
353 | |
3960 | 354 { |
355 /* sysclasspath, java_home, dll_dir */ | |
356 { | |
357 char *home_path; | |
358 char *dll_path; | |
359 char *pslash; | |
360 char buf[MAXPATHLEN]; | |
361 os::jvm_path(buf, sizeof(buf)); | |
362 | |
363 // Found the full path to libjvm.so. | |
364 // Now cut the path to <java_home>/jre if we can. | |
365 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
366 pslash = strrchr(buf, '/'); | |
367 if (pslash != NULL) | |
368 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
369 dll_path = malloc(strlen(buf) + 1); | |
370 if (dll_path == NULL) | |
371 return; | |
372 strcpy(dll_path, buf); | |
373 Arguments::set_dll_dir(dll_path); | |
374 | |
375 if (pslash != NULL) { | |
376 pslash = strrchr(buf, '/'); | |
377 if (pslash != NULL) { | |
4006 | 378 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
379 #ifndef __APPLE__ | |
3960 | 380 pslash = strrchr(buf, '/'); |
381 if (pslash != NULL) | |
382 *pslash = '\0'; /* get rid of /lib */ | |
4006 | 383 #endif |
3960 | 384 } |
385 } | |
386 | |
387 home_path = malloc(strlen(buf) + 1); | |
388 if (home_path == NULL) | |
389 return; | |
390 strcpy(home_path, buf); | |
391 Arguments::set_java_home(home_path); | |
392 | |
393 if (!set_boot_path('/', ':')) | |
394 return; | |
395 } | |
396 | |
397 /* | |
398 * Where to look for native libraries | |
399 * | |
400 * Note: Due to a legacy implementation, most of the library path | |
401 * is set in the launcher. This was to accomodate linking restrictions | |
402 * on legacy Bsd implementations (which are no longer supported). | |
403 * Eventually, all the library path setting will be done here. | |
404 * | |
405 * However, to prevent the proliferation of improperly built native | |
406 * libraries, the new path component /usr/java/packages is added here. | |
407 * Eventually, all the library path setting will be done here. | |
408 */ | |
409 { | |
410 char *ld_library_path; | |
411 | |
412 /* | |
413 * Construct the invariant part of ld_library_path. Note that the | |
414 * space for the colon and the trailing null are provided by the | |
415 * nulls included by the sizeof operator (so actually we allocate | |
416 * a byte more than necessary). | |
417 */ | |
4006 | 418 #ifdef __APPLE__ |
419 ld_library_path = (char *) malloc(system_ext_size); | |
420 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
421 #else | |
3960 | 422 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
423 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
424 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
4006 | 425 #endif |
3960 | 426 |
427 /* | |
428 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
429 * should always exist (until the legacy problem cited above is | |
430 * addressed). | |
431 */ | |
432 #ifdef __APPLE__ | |
4006 | 433 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
434 char *l = getenv("JAVA_LIBRARY_PATH"); | |
435 if (l != NULL) { | |
436 char *t = ld_library_path; | |
437 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
438 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
439 sprintf(ld_library_path, "%s:%s", l, t); | |
440 free(t); | |
441 } | |
442 | |
3960 | 443 char *v = getenv("DYLD_LIBRARY_PATH"); |
444 #else | |
445 char *v = getenv("LD_LIBRARY_PATH"); | |
446 #endif | |
447 if (v != NULL) { | |
448 char *t = ld_library_path; | |
449 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
450 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
451 sprintf(ld_library_path, "%s:%s", v, t); | |
4006 | 452 free(t); |
3960 | 453 } |
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454 |
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455 #ifdef __APPLE__ |
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456 // Apple's Java6 has "." at the beginning of java.library.path. |
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457 // OpenJDK on Windows has "." at the end of java.library.path. |
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458 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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459 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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460 // "." is appended to the end of java.library.path. Yes, this |
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461 // could cause a change in behavior, but Apple's Java6 behavior |
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462 // can be achieved by putting "." at the beginning of the |
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463 // JAVA_LIBRARY_PATH environment variable. |
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464 { |
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465 char *t = ld_library_path; |
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466 // that's +3 for appending ":." and the trailing '\0' |
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467 ld_library_path = (char *) malloc(strlen(t) + 3); |
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468 sprintf(ld_library_path, "%s:%s", t, "."); |
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469 free(t); |
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470 } |
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471 #endif |
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472 |
3960 | 473 Arguments::set_library_path(ld_library_path); |
474 } | |
475 | |
476 /* | |
477 * Extensions directories. | |
478 * | |
479 * Note that the space for the colon and the trailing null are provided | |
480 * by the nulls included by the sizeof operator (so actually one byte more | |
481 * than necessary is allocated). | |
482 */ | |
483 { | |
4006 | 484 #ifdef __APPLE__ |
485 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
486 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
487 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
488 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
489 #else | |
3960 | 490 char *buf = malloc(strlen(Arguments::get_java_home()) + |
491 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
492 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
493 Arguments::get_java_home()); | |
4006 | 494 #endif |
495 | |
3960 | 496 Arguments::set_ext_dirs(buf); |
497 } | |
498 | |
499 /* Endorsed standards default directory. */ | |
500 { | |
501 char * buf; | |
502 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
503 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
504 Arguments::set_endorsed_dirs(buf); | |
505 } | |
506 } | |
507 | |
4006 | 508 #ifdef __APPLE__ |
509 #undef SYS_EXTENSIONS_DIR | |
510 #endif | |
3960 | 511 #undef malloc |
512 #undef getenv | |
513 #undef EXTENSIONS_DIR | |
514 #undef ENDORSED_DIR | |
515 | |
516 // Done | |
517 return; | |
518 } | |
519 | |
520 //////////////////////////////////////////////////////////////////////////////// | |
521 // breakpoint support | |
522 | |
523 void os::breakpoint() { | |
524 BREAKPOINT; | |
525 } | |
526 | |
527 extern "C" void breakpoint() { | |
528 // use debugger to set breakpoint here | |
529 } | |
530 | |
531 //////////////////////////////////////////////////////////////////////////////// | |
532 // signal support | |
533 | |
534 debug_only(static bool signal_sets_initialized = false); | |
535 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
536 | |
537 bool os::Bsd::is_sig_ignored(int sig) { | |
538 struct sigaction oact; | |
539 sigaction(sig, (struct sigaction*)NULL, &oact); | |
540 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
541 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
542 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
543 return true; | |
544 else | |
545 return false; | |
546 } | |
547 | |
548 void os::Bsd::signal_sets_init() { | |
549 // Should also have an assertion stating we are still single-threaded. | |
550 assert(!signal_sets_initialized, "Already initialized"); | |
551 // Fill in signals that are necessarily unblocked for all threads in | |
552 // the VM. Currently, we unblock the following signals: | |
553 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
554 // by -Xrs (=ReduceSignalUsage)); | |
555 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
556 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
557 // the dispositions or masks wrt these signals. | |
558 // Programs embedding the VM that want to use the above signals for their | |
559 // own purposes must, at this time, use the "-Xrs" option to prevent | |
560 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
561 // (See bug 4345157, and other related bugs). | |
562 // In reality, though, unblocking these signals is really a nop, since | |
563 // these signals are not blocked by default. | |
564 sigemptyset(&unblocked_sigs); | |
565 sigemptyset(&allowdebug_blocked_sigs); | |
566 sigaddset(&unblocked_sigs, SIGILL); | |
567 sigaddset(&unblocked_sigs, SIGSEGV); | |
568 sigaddset(&unblocked_sigs, SIGBUS); | |
569 sigaddset(&unblocked_sigs, SIGFPE); | |
570 sigaddset(&unblocked_sigs, SR_signum); | |
571 | |
572 if (!ReduceSignalUsage) { | |
573 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
574 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
575 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
576 } | |
577 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
578 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
579 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
580 } | |
581 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
582 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
583 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
584 } | |
585 } | |
586 // Fill in signals that are blocked by all but the VM thread. | |
587 sigemptyset(&vm_sigs); | |
588 if (!ReduceSignalUsage) | |
589 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
590 debug_only(signal_sets_initialized = true); | |
591 | |
592 } | |
593 | |
594 // These are signals that are unblocked while a thread is running Java. | |
595 // (For some reason, they get blocked by default.) | |
596 sigset_t* os::Bsd::unblocked_signals() { | |
597 assert(signal_sets_initialized, "Not initialized"); | |
598 return &unblocked_sigs; | |
599 } | |
600 | |
601 // These are the signals that are blocked while a (non-VM) thread is | |
602 // running Java. Only the VM thread handles these signals. | |
603 sigset_t* os::Bsd::vm_signals() { | |
604 assert(signal_sets_initialized, "Not initialized"); | |
605 return &vm_sigs; | |
606 } | |
607 | |
608 // These are signals that are blocked during cond_wait to allow debugger in | |
609 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
610 assert(signal_sets_initialized, "Not initialized"); | |
611 return &allowdebug_blocked_sigs; | |
612 } | |
613 | |
614 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
615 | |
616 //Save caller's signal mask before setting VM signal mask | |
617 sigset_t caller_sigmask; | |
618 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
619 | |
620 OSThread* osthread = thread->osthread(); | |
621 osthread->set_caller_sigmask(caller_sigmask); | |
622 | |
623 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
624 | |
625 if (!ReduceSignalUsage) { | |
626 if (thread->is_VM_thread()) { | |
627 // Only the VM thread handles BREAK_SIGNAL ... | |
628 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
629 } else { | |
630 // ... all other threads block BREAK_SIGNAL | |
631 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
632 } | |
633 } | |
634 } | |
635 | |
636 | |
637 ////////////////////////////////////////////////////////////////////////////// | |
638 // create new thread | |
639 | |
640 static address highest_vm_reserved_address(); | |
641 | |
642 // check if it's safe to start a new thread | |
643 static bool _thread_safety_check(Thread* thread) { | |
6918 | 644 return true; |
3960 | 645 } |
646 | |
4006 | 647 #ifdef __APPLE__ |
648 // library handle for calling objc_registerThreadWithCollector() | |
649 // without static linking to the libobjc library | |
650 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
651 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
652 typedef void (*objc_registerThreadWithCollector_t)(); | |
653 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
654 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
655 #endif | |
656 | |
3960 | 657 // Thread start routine for all newly created threads |
658 static void *java_start(Thread *thread) { | |
659 // Try to randomize the cache line index of hot stack frames. | |
660 // This helps when threads of the same stack traces evict each other's | |
661 // cache lines. The threads can be either from the same JVM instance, or | |
662 // from different JVM instances. The benefit is especially true for | |
663 // processors with hyperthreading technology. | |
664 static int counter = 0; | |
665 int pid = os::current_process_id(); | |
666 alloca(((pid ^ counter++) & 7) * 128); | |
667 | |
668 ThreadLocalStorage::set_thread(thread); | |
669 | |
670 OSThread* osthread = thread->osthread(); | |
671 Monitor* sync = osthread->startThread_lock(); | |
672 | |
673 // non floating stack BsdThreads needs extra check, see above | |
674 if (!_thread_safety_check(thread)) { | |
675 // notify parent thread | |
676 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
677 osthread->set_state(ZOMBIE); | |
678 sync->notify_all(); | |
679 return NULL; | |
680 } | |
681 | |
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682 #ifdef __APPLE__ |
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683 // thread_id is mach thread on macos |
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684 osthread->set_thread_id(::mach_thread_self()); |
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685 #else |
3960 | 686 // thread_id is pthread_id on BSD |
687 osthread->set_thread_id(::pthread_self()); | |
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688 #endif |
3960 | 689 // initialize signal mask for this thread |
690 os::Bsd::hotspot_sigmask(thread); | |
691 | |
692 // initialize floating point control register | |
693 os::Bsd::init_thread_fpu_state(); | |
694 | |
4006 | 695 #ifdef __APPLE__ |
696 // register thread with objc gc | |
697 if (objc_registerThreadWithCollectorFunction != NULL) { | |
698 objc_registerThreadWithCollectorFunction(); | |
699 } | |
700 #endif | |
701 | |
3960 | 702 // handshaking with parent thread |
703 { | |
704 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
705 | |
706 // notify parent thread | |
707 osthread->set_state(INITIALIZED); | |
708 sync->notify_all(); | |
709 | |
710 // wait until os::start_thread() | |
711 while (osthread->get_state() == INITIALIZED) { | |
712 sync->wait(Mutex::_no_safepoint_check_flag); | |
713 } | |
714 } | |
715 | |
716 // call one more level start routine | |
717 thread->run(); | |
718 | |
719 return 0; | |
720 } | |
721 | |
722 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
723 assert(thread->osthread() == NULL, "caller responsible"); | |
724 | |
725 // Allocate the OSThread object | |
726 OSThread* osthread = new OSThread(NULL, NULL); | |
727 if (osthread == NULL) { | |
728 return false; | |
729 } | |
730 | |
731 // set the correct thread state | |
732 osthread->set_thread_type(thr_type); | |
733 | |
734 // Initial state is ALLOCATED but not INITIALIZED | |
735 osthread->set_state(ALLOCATED); | |
736 | |
737 thread->set_osthread(osthread); | |
738 | |
739 // init thread attributes | |
740 pthread_attr_t attr; | |
741 pthread_attr_init(&attr); | |
742 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
743 | |
744 // stack size | |
745 if (os::Bsd::supports_variable_stack_size()) { | |
746 // calculate stack size if it's not specified by caller | |
747 if (stack_size == 0) { | |
748 stack_size = os::Bsd::default_stack_size(thr_type); | |
749 | |
750 switch (thr_type) { | |
751 case os::java_thread: | |
752 // Java threads use ThreadStackSize which default value can be | |
753 // changed with the flag -Xss | |
754 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
755 stack_size = JavaThread::stack_size_at_create(); | |
756 break; | |
757 case os::compiler_thread: | |
758 if (CompilerThreadStackSize > 0) { | |
759 stack_size = (size_t)(CompilerThreadStackSize * K); | |
760 break; | |
761 } // else fall through: | |
762 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
763 case os::vm_thread: | |
764 case os::pgc_thread: | |
765 case os::cgc_thread: | |
766 case os::watcher_thread: | |
767 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
768 break; | |
769 } | |
770 } | |
771 | |
772 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
773 pthread_attr_setstacksize(&attr, stack_size); | |
774 } else { | |
775 // let pthread_create() pick the default value. | |
776 } | |
777 | |
778 ThreadState state; | |
779 | |
780 { | |
781 pthread_t tid; | |
782 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
783 | |
784 pthread_attr_destroy(&attr); | |
785 | |
786 if (ret != 0) { | |
787 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
788 perror("pthread_create()"); | |
789 } | |
790 // Need to clean up stuff we've allocated so far | |
791 thread->set_osthread(NULL); | |
792 delete osthread; | |
793 return false; | |
794 } | |
795 | |
796 // Store pthread info into the OSThread | |
797 osthread->set_pthread_id(tid); | |
798 | |
799 // Wait until child thread is either initialized or aborted | |
800 { | |
801 Monitor* sync_with_child = osthread->startThread_lock(); | |
802 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
803 while ((state = osthread->get_state()) == ALLOCATED) { | |
804 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
805 } | |
806 } | |
807 | |
808 } | |
809 | |
810 // Aborted due to thread limit being reached | |
811 if (state == ZOMBIE) { | |
812 thread->set_osthread(NULL); | |
813 delete osthread; | |
814 return false; | |
815 } | |
816 | |
817 // The thread is returned suspended (in state INITIALIZED), | |
818 // and is started higher up in the call chain | |
819 assert(state == INITIALIZED, "race condition"); | |
820 return true; | |
821 } | |
822 | |
823 ///////////////////////////////////////////////////////////////////////////// | |
824 // attach existing thread | |
825 | |
826 // bootstrap the main thread | |
827 bool os::create_main_thread(JavaThread* thread) { | |
828 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
829 return create_attached_thread(thread); | |
830 } | |
831 | |
832 bool os::create_attached_thread(JavaThread* thread) { | |
833 #ifdef ASSERT | |
834 thread->verify_not_published(); | |
835 #endif | |
836 | |
837 // Allocate the OSThread object | |
838 OSThread* osthread = new OSThread(NULL, NULL); | |
839 | |
840 if (osthread == NULL) { | |
841 return false; | |
842 } | |
843 | |
844 // Store pthread info into the OSThread | |
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845 #ifdef __APPLE__ |
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846 osthread->set_thread_id(::mach_thread_self()); |
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847 #else |
3960 | 848 osthread->set_thread_id(::pthread_self()); |
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849 #endif |
3960 | 850 osthread->set_pthread_id(::pthread_self()); |
851 | |
852 // initialize floating point control register | |
853 os::Bsd::init_thread_fpu_state(); | |
854 | |
855 // Initial thread state is RUNNABLE | |
856 osthread->set_state(RUNNABLE); | |
857 | |
858 thread->set_osthread(osthread); | |
859 | |
860 // initialize signal mask for this thread | |
861 // and save the caller's signal mask | |
862 os::Bsd::hotspot_sigmask(thread); | |
863 | |
864 return true; | |
865 } | |
866 | |
867 void os::pd_start_thread(Thread* thread) { | |
868 OSThread * osthread = thread->osthread(); | |
869 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
870 Monitor* sync_with_child = osthread->startThread_lock(); | |
871 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
872 sync_with_child->notify(); | |
873 } | |
874 | |
875 // Free Bsd resources related to the OSThread | |
876 void os::free_thread(OSThread* osthread) { | |
877 assert(osthread != NULL, "osthread not set"); | |
878 | |
879 if (Thread::current()->osthread() == osthread) { | |
880 // Restore caller's signal mask | |
881 sigset_t sigmask = osthread->caller_sigmask(); | |
882 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
883 } | |
884 | |
885 delete osthread; | |
886 } | |
887 | |
888 ////////////////////////////////////////////////////////////////////////////// | |
889 // thread local storage | |
890 | |
891 int os::allocate_thread_local_storage() { | |
892 pthread_key_t key; | |
893 int rslt = pthread_key_create(&key, NULL); | |
894 assert(rslt == 0, "cannot allocate thread local storage"); | |
895 return (int)key; | |
896 } | |
897 | |
898 // Note: This is currently not used by VM, as we don't destroy TLS key | |
899 // on VM exit. | |
900 void os::free_thread_local_storage(int index) { | |
901 int rslt = pthread_key_delete((pthread_key_t)index); | |
902 assert(rslt == 0, "invalid index"); | |
903 } | |
904 | |
905 void os::thread_local_storage_at_put(int index, void* value) { | |
906 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
907 assert(rslt == 0, "pthread_setspecific failed"); | |
908 } | |
909 | |
910 extern "C" Thread* get_thread() { | |
911 return ThreadLocalStorage::thread(); | |
912 } | |
913 | |
914 | |
915 //////////////////////////////////////////////////////////////////////////////// | |
916 // time support | |
917 | |
918 // Time since start-up in seconds to a fine granularity. | |
919 // Used by VMSelfDestructTimer and the MemProfiler. | |
920 double os::elapsedTime() { | |
921 | |
922 return (double)(os::elapsed_counter()) * 0.000001; | |
923 } | |
924 | |
925 jlong os::elapsed_counter() { | |
926 timeval time; | |
927 int status = gettimeofday(&time, NULL); | |
928 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
929 } | |
930 | |
931 jlong os::elapsed_frequency() { | |
932 return (1000 * 1000); | |
933 } | |
934 | |
935 // XXX: For now, code this as if BSD does not support vtime. | |
936 bool os::supports_vtime() { return false; } | |
937 bool os::enable_vtime() { return false; } | |
938 bool os::vtime_enabled() { return false; } | |
939 double os::elapsedVTime() { | |
940 // better than nothing, but not much | |
941 return elapsedTime(); | |
942 } | |
943 | |
944 jlong os::javaTimeMillis() { | |
945 timeval time; | |
946 int status = gettimeofday(&time, NULL); | |
947 assert(status != -1, "bsd error"); | |
948 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
949 } | |
950 | |
951 #ifndef CLOCK_MONOTONIC | |
952 #define CLOCK_MONOTONIC (1) | |
953 #endif | |
954 | |
955 #ifdef __APPLE__ | |
956 void os::Bsd::clock_init() { | |
957 // XXXDARWIN: Investigate replacement monotonic clock | |
958 } | |
6918 | 959 #else |
3960 | 960 void os::Bsd::clock_init() { |
961 struct timespec res; | |
962 struct timespec tp; | |
963 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
964 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
965 // yes, monotonic clock is supported | |
966 _clock_gettime = ::clock_gettime; | |
967 } | |
968 } | |
969 #endif | |
970 | |
971 | |
972 jlong os::javaTimeNanos() { | |
973 if (Bsd::supports_monotonic_clock()) { | |
974 struct timespec tp; | |
975 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
976 assert(status == 0, "gettime error"); | |
977 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
978 return result; | |
979 } else { | |
980 timeval time; | |
981 int status = gettimeofday(&time, NULL); | |
982 assert(status != -1, "bsd error"); | |
983 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
984 return 1000 * usecs; | |
985 } | |
986 } | |
987 | |
988 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
989 if (Bsd::supports_monotonic_clock()) { | |
990 info_ptr->max_value = ALL_64_BITS; | |
991 | |
992 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
993 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
994 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
995 } else { | |
996 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
997 info_ptr->max_value = ALL_64_BITS; | |
998 | |
999 // gettimeofday is a real time clock so it skips | |
1000 info_ptr->may_skip_backward = true; | |
1001 info_ptr->may_skip_forward = true; | |
1002 } | |
1003 | |
1004 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1005 } | |
1006 | |
1007 // Return the real, user, and system times in seconds from an | |
1008 // arbitrary fixed point in the past. | |
1009 bool os::getTimesSecs(double* process_real_time, | |
1010 double* process_user_time, | |
1011 double* process_system_time) { | |
1012 struct tms ticks; | |
1013 clock_t real_ticks = times(&ticks); | |
1014 | |
1015 if (real_ticks == (clock_t) (-1)) { | |
1016 return false; | |
1017 } else { | |
1018 double ticks_per_second = (double) clock_tics_per_sec; | |
1019 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1020 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1021 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1022 | |
1023 return true; | |
1024 } | |
1025 } | |
1026 | |
1027 | |
1028 char * os::local_time_string(char *buf, size_t buflen) { | |
1029 struct tm t; | |
1030 time_t long_time; | |
1031 time(&long_time); | |
1032 localtime_r(&long_time, &t); | |
1033 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1034 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1035 t.tm_hour, t.tm_min, t.tm_sec); | |
1036 return buf; | |
1037 } | |
1038 | |
1039 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1040 return localtime_r(clock, res); | |
1041 } | |
1042 | |
1043 //////////////////////////////////////////////////////////////////////////////// | |
1044 // runtime exit support | |
1045 | |
1046 // Note: os::shutdown() might be called very early during initialization, or | |
1047 // called from signal handler. Before adding something to os::shutdown(), make | |
1048 // sure it is async-safe and can handle partially initialized VM. | |
1049 void os::shutdown() { | |
1050 | |
1051 // allow PerfMemory to attempt cleanup of any persistent resources | |
1052 perfMemory_exit(); | |
1053 | |
1054 // needs to remove object in file system | |
1055 AttachListener::abort(); | |
1056 | |
1057 // flush buffered output, finish log files | |
1058 ostream_abort(); | |
1059 | |
1060 // Check for abort hook | |
1061 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1062 if (abort_hook != NULL) { | |
1063 abort_hook(); | |
1064 } | |
1065 | |
1066 } | |
1067 | |
1068 // Note: os::abort() might be called very early during initialization, or | |
1069 // called from signal handler. Before adding something to os::abort(), make | |
1070 // sure it is async-safe and can handle partially initialized VM. | |
1071 void os::abort(bool dump_core) { | |
1072 os::shutdown(); | |
1073 if (dump_core) { | |
1074 #ifndef PRODUCT | |
1075 fdStream out(defaultStream::output_fd()); | |
1076 out.print_raw("Current thread is "); | |
1077 char buf[16]; | |
1078 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1079 out.print_raw_cr(buf); | |
1080 out.print_raw_cr("Dumping core ..."); | |
1081 #endif | |
1082 ::abort(); // dump core | |
1083 } | |
1084 | |
1085 ::exit(1); | |
1086 } | |
1087 | |
1088 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1089 void os::die() { | |
1090 // _exit() on BsdThreads only kills current thread | |
1091 ::abort(); | |
1092 } | |
1093 | |
1094 // unused on bsd for now. | |
1095 void os::set_error_file(const char *logfile) {} | |
1096 | |
1097 | |
1098 // This method is a copy of JDK's sysGetLastErrorString | |
1099 // from src/solaris/hpi/src/system_md.c | |
1100 | |
1101 size_t os::lasterror(char *buf, size_t len) { | |
1102 | |
1103 if (errno == 0) return 0; | |
1104 | |
1105 const char *s = ::strerror(errno); | |
1106 size_t n = ::strlen(s); | |
1107 if (n >= len) { | |
1108 n = len - 1; | |
1109 } | |
1110 ::strncpy(buf, s, n); | |
1111 buf[n] = '\0'; | |
1112 return n; | |
1113 } | |
1114 | |
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1115 intx os::current_thread_id() { |
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1116 #ifdef __APPLE__ |
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1117 return (intx)::mach_thread_self(); |
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1118 #else |
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1119 return (intx)::pthread_self(); |
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1120 #endif |
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1121 } |
3960 | 1122 int os::current_process_id() { |
1123 | |
1124 // Under the old bsd thread library, bsd gives each thread | |
1125 // its own process id. Because of this each thread will return | |
1126 // a different pid if this method were to return the result | |
1127 // of getpid(2). Bsd provides no api that returns the pid | |
1128 // of the launcher thread for the vm. This implementation | |
1129 // returns a unique pid, the pid of the launcher thread | |
1130 // that starts the vm 'process'. | |
1131 | |
1132 // Under the NPTL, getpid() returns the same pid as the | |
1133 // launcher thread rather than a unique pid per thread. | |
1134 // Use gettid() if you want the old pre NPTL behaviour. | |
1135 | |
1136 // if you are looking for the result of a call to getpid() that | |
1137 // returns a unique pid for the calling thread, then look at the | |
1138 // OSThread::thread_id() method in osThread_bsd.hpp file | |
1139 | |
1140 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1141 } | |
1142 | |
1143 // DLL functions | |
1144 | |
1145 #define JNI_LIB_PREFIX "lib" | |
1146 #ifdef __APPLE__ | |
1147 #define JNI_LIB_SUFFIX ".dylib" | |
1148 #else | |
1149 #define JNI_LIB_SUFFIX ".so" | |
1150 #endif | |
1151 | |
1152 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
1153 | |
1154 // This must be hard coded because it's the system's temporary | |
1155 // directory not the java application's temp directory, ala java.io.tmpdir. | |
4006 | 1156 #ifdef __APPLE__ |
1157 // macosx has a secure per-user temporary directory | |
1158 char temp_path_storage[PATH_MAX]; | |
1159 const char* os::get_temp_directory() { | |
1160 static char *temp_path = NULL; | |
1161 if (temp_path == NULL) { | |
1162 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
1163 if (pathSize == 0 || pathSize > PATH_MAX) { | |
1164 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
1165 } | |
1166 temp_path = temp_path_storage; | |
1167 } | |
1168 return temp_path; | |
1169 } | |
1170 #else /* __APPLE__ */ | |
3960 | 1171 const char* os::get_temp_directory() { return "/tmp"; } |
4006 | 1172 #endif /* __APPLE__ */ |
3960 | 1173 |
1174 static bool file_exists(const char* filename) { | |
1175 struct stat statbuf; | |
1176 if (filename == NULL || strlen(filename) == 0) { | |
1177 return false; | |
1178 } | |
1179 return os::stat(filename, &statbuf) == 0; | |
1180 } | |
1181 | |
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1182 bool os::dll_build_name(char* buffer, size_t buflen, |
3960 | 1183 const char* pname, const char* fname) { |
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1184 bool retval = false; |
3960 | 1185 // Copied from libhpi |
1186 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1187 | |
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1188 // Return error on buffer overflow. |
3960 | 1189 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1190 return retval; |
3960 | 1191 } |
1192 | |
1193 if (pnamelen == 0) { | |
1194 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1195 retval = true; |
3960 | 1196 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1197 int n; | |
1198 char** pelements = split_path(pname, &n); | |
1199 for (int i = 0 ; i < n ; i++) { | |
1200 // Really shouldn't be NULL, but check can't hurt | |
1201 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1202 continue; // skip the empty path values | |
1203 } | |
1204 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
1205 pelements[i], fname); | |
1206 if (file_exists(buffer)) { | |
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1207 retval = true; |
3960 | 1208 break; |
1209 } | |
1210 } | |
1211 // release the storage | |
1212 for (int i = 0 ; i < n ; i++) { | |
1213 if (pelements[i] != NULL) { | |
6197 | 1214 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
3960 | 1215 } |
1216 } | |
1217 if (pelements != NULL) { | |
6197 | 1218 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
3960 | 1219 } |
1220 } else { | |
1221 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1222 retval = true; |
3960 | 1223 } |
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1224 return retval; |
3960 | 1225 } |
1226 | |
1227 const char* os::get_current_directory(char *buf, int buflen) { | |
1228 return getcwd(buf, buflen); | |
1229 } | |
1230 | |
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1231 // check if addr is inside libjvm.so |
3960 | 1232 bool os::address_is_in_vm(address addr) { |
1233 static address libjvm_base_addr; | |
1234 Dl_info dlinfo; | |
1235 | |
1236 if (libjvm_base_addr == NULL) { | |
1237 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
1238 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
1239 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
1240 } | |
1241 | |
1242 if (dladdr((void *)addr, &dlinfo)) { | |
1243 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
1244 } | |
1245 | |
1246 return false; | |
1247 } | |
1248 | |
6258 | 1249 |
1250 #define MACH_MAXSYMLEN 256 | |
1251 | |
3960 | 1252 bool os::dll_address_to_function_name(address addr, char *buf, |
1253 int buflen, int *offset) { | |
1254 Dl_info dlinfo; | |
6258 | 1255 char localbuf[MACH_MAXSYMLEN]; |
1256 | |
1257 // dladdr will find names of dynamic functions only, but does | |
1258 // it set dli_fbase with mach_header address when it "fails" ? | |
3960 | 1259 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
1260 if (buf != NULL) { | |
1261 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
1262 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
1263 } | |
1264 } | |
1265 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
1266 return true; | |
1267 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
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1269 buf, buflen, offset, dlinfo.dli_fname)) { |
3960 | 1270 return true; |
1271 } | |
1272 } | |
1273 | |
6258 | 1274 // Handle non-dymanic manually: |
1275 if (dlinfo.dli_fbase != NULL && | |
1276 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
1277 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
1278 jio_snprintf(buf, buflen, "%s", localbuf); | |
1279 } | |
1280 return true; | |
1281 } | |
3960 | 1282 if (buf != NULL) buf[0] = '\0'; |
1283 if (offset != NULL) *offset = -1; | |
1284 return false; | |
1285 } | |
1286 | |
1287 // ported from solaris version | |
1288 bool os::dll_address_to_library_name(address addr, char* buf, | |
1289 int buflen, int* offset) { | |
1290 Dl_info dlinfo; | |
1291 | |
1292 if (dladdr((void*)addr, &dlinfo)){ | |
1293 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
1294 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
1295 return true; | |
1296 } else { | |
1297 if (buf) buf[0] = '\0'; | |
1298 if (offset) *offset = -1; | |
1299 return false; | |
1300 } | |
1301 } | |
6918 | 1302 |
1303 // Loads .dll/.so and | |
1304 // in case of error it checks if .dll/.so was built for the | |
1305 // same architecture as Hotspot is running on | |
3960 | 1306 |
1307 #ifdef __APPLE__ | |
1308 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1309 void * result= ::dlopen(filename, RTLD_LAZY); | |
1310 if (result != NULL) { | |
1311 // Successful loading | |
1312 return result; | |
1313 } | |
1314 | |
1315 // Read system error message into ebuf | |
1316 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1317 ebuf[ebuflen-1]='\0'; | |
1318 | |
1319 return NULL; | |
1320 } | |
1321 #else | |
1322 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1323 { | |
1324 void * result= ::dlopen(filename, RTLD_LAZY); | |
1325 if (result != NULL) { | |
1326 // Successful loading | |
1327 return result; | |
1328 } | |
1329 | |
1330 Elf32_Ehdr elf_head; | |
1331 | |
1332 // Read system error message into ebuf | |
1333 // It may or may not be overwritten below | |
1334 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1335 ebuf[ebuflen-1]='\0'; | |
1336 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1337 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1338 | |
1339 if (diag_msg_max_length==0) { | |
1340 // No more space in ebuf for additional diagnostics message | |
1341 return NULL; | |
1342 } | |
1343 | |
1344 | |
1345 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1346 | |
1347 if (file_descriptor < 0) { | |
1348 // Can't open library, report dlerror() message | |
1349 return NULL; | |
1350 } | |
1351 | |
1352 bool failed_to_read_elf_head= | |
1353 (sizeof(elf_head)!= | |
1354 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1355 | |
1356 ::close(file_descriptor); | |
1357 if (failed_to_read_elf_head) { | |
1358 // file i/o error - report dlerror() msg | |
1359 return NULL; | |
1360 } | |
1361 | |
1362 typedef struct { | |
1363 Elf32_Half code; // Actual value as defined in elf.h | |
1364 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1365 char elf_class; // 32 or 64 bit | |
1366 char endianess; // MSB or LSB | |
1367 char* name; // String representation | |
1368 } arch_t; | |
1369 | |
1370 #ifndef EM_486 | |
1371 #define EM_486 6 /* Intel 80486 */ | |
1372 #endif | |
1373 | |
1374 #ifndef EM_MIPS_RS3_LE | |
1375 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
1376 #endif | |
1377 | |
1378 #ifndef EM_PPC64 | |
1379 #define EM_PPC64 21 /* PowerPC64 */ | |
1380 #endif | |
1381 | |
1382 #ifndef EM_S390 | |
1383 #define EM_S390 22 /* IBM System/390 */ | |
1384 #endif | |
1385 | |
1386 #ifndef EM_IA_64 | |
1387 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
1388 #endif | |
1389 | |
1390 #ifndef EM_X86_64 | |
1391 #define EM_X86_64 62 /* AMD x86-64 */ | |
1392 #endif | |
1393 | |
1394 static const arch_t arch_array[]={ | |
1395 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1396 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1397 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1398 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1399 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1400 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1401 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1402 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1403 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
1404 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1405 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1406 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1407 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1408 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1409 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1410 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
1411 }; | |
1412 | |
1413 #if (defined IA32) | |
1414 static Elf32_Half running_arch_code=EM_386; | |
1415 #elif (defined AMD64) | |
1416 static Elf32_Half running_arch_code=EM_X86_64; | |
1417 #elif (defined IA64) | |
1418 static Elf32_Half running_arch_code=EM_IA_64; | |
1419 #elif (defined __sparc) && (defined _LP64) | |
1420 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1421 #elif (defined __sparc) && (!defined _LP64) | |
1422 static Elf32_Half running_arch_code=EM_SPARC; | |
1423 #elif (defined __powerpc64__) | |
1424 static Elf32_Half running_arch_code=EM_PPC64; | |
1425 #elif (defined __powerpc__) | |
1426 static Elf32_Half running_arch_code=EM_PPC; | |
1427 #elif (defined ARM) | |
1428 static Elf32_Half running_arch_code=EM_ARM; | |
1429 #elif (defined S390) | |
1430 static Elf32_Half running_arch_code=EM_S390; | |
1431 #elif (defined ALPHA) | |
1432 static Elf32_Half running_arch_code=EM_ALPHA; | |
1433 #elif (defined MIPSEL) | |
1434 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1435 #elif (defined PARISC) | |
1436 static Elf32_Half running_arch_code=EM_PARISC; | |
1437 #elif (defined MIPS) | |
1438 static Elf32_Half running_arch_code=EM_MIPS; | |
1439 #elif (defined M68K) | |
1440 static Elf32_Half running_arch_code=EM_68K; | |
1441 #else | |
1442 #error Method os::dll_load requires that one of following is defined:\ | |
1443 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
1444 #endif | |
1445 | |
1446 // Identify compatability class for VM's architecture and library's architecture | |
1447 // Obtain string descriptions for architectures | |
1448 | |
1449 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1450 int running_arch_index=-1; | |
1451 | |
1452 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1453 if (running_arch_code == arch_array[i].code) { | |
1454 running_arch_index = i; | |
1455 } | |
1456 if (lib_arch.code == arch_array[i].code) { | |
1457 lib_arch.compat_class = arch_array[i].compat_class; | |
1458 lib_arch.name = arch_array[i].name; | |
1459 } | |
1460 } | |
1461 | |
1462 assert(running_arch_index != -1, | |
1463 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1464 if (running_arch_index == -1) { | |
1465 // Even though running architecture detection failed | |
1466 // we may still continue with reporting dlerror() message | |
1467 return NULL; | |
1468 } | |
1469 | |
1470 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1471 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1472 return NULL; | |
1473 } | |
1474 | |
1475 #ifndef S390 | |
1476 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
1477 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1478 return NULL; | |
1479 } | |
1480 #endif // !S390 | |
1481 | |
1482 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1483 if ( lib_arch.name!=NULL ) { | |
1484 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1485 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1486 lib_arch.name, arch_array[running_arch_index].name); | |
1487 } else { | |
1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1489 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1490 lib_arch.code, | |
1491 arch_array[running_arch_index].name); | |
1492 } | |
1493 } | |
1494 | |
1495 return NULL; | |
1496 } | |
1497 #endif /* !__APPLE__ */ | |
1498 | |
1499 // XXX: Do we need a lock around this as per Linux? | |
1500 void* os::dll_lookup(void* handle, const char* name) { | |
1501 return dlsym(handle, name); | |
1502 } | |
1503 | |
1504 | |
1505 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
1506 int fd = ::open(filename, O_RDONLY); | |
1507 if (fd == -1) { | |
1508 return false; | |
1509 } | |
1510 | |
1511 char buf[32]; | |
1512 int bytes; | |
1513 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
1514 st->print_raw(buf, bytes); | |
1515 } | |
1516 | |
1517 ::close(fd); | |
1518 | |
1519 return true; | |
1520 } | |
1521 | |
1522 void os::print_dll_info(outputStream *st) { | |
1523 st->print_cr("Dynamic libraries:"); | |
1524 #ifdef RTLD_DI_LINKMAP | |
1525 Dl_info dli; | |
1526 void *handle; | |
1527 Link_map *map; | |
1528 Link_map *p; | |
1529 | |
1530 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
1531 st->print_cr("Error: Cannot print dynamic libraries."); | |
1532 return; | |
1533 } | |
1534 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
1535 if (handle == NULL) { | |
1536 st->print_cr("Error: Cannot print dynamic libraries."); | |
1537 return; | |
1538 } | |
1539 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
1540 if (map == NULL) { | |
1541 st->print_cr("Error: Cannot print dynamic libraries."); | |
1542 return; | |
1543 } | |
1544 | |
1545 while (map->l_prev != NULL) | |
1546 map = map->l_prev; | |
1547 | |
1548 while (map != NULL) { | |
1549 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
1550 map = map->l_next; | |
1551 } | |
1552 | |
1553 dlclose(handle); | |
1554 #elif defined(__APPLE__) | |
1555 uint32_t count; | |
1556 uint32_t i; | |
1557 | |
1558 count = _dyld_image_count(); | |
1559 for (i = 1; i < count; i++) { | |
1560 const char *name = _dyld_get_image_name(i); | |
1561 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
1562 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
1563 } | |
1564 #else | |
1565 st->print_cr("Error: Cannot print dynamic libraries."); | |
1566 #endif | |
1567 } | |
1568 | |
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1569 void os::print_os_info_brief(outputStream* st) { |
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1570 st->print("Bsd"); |
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1571 |
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1572 os::Posix::print_uname_info(st); |
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1573 } |
3960 | 1574 |
1575 void os::print_os_info(outputStream* st) { | |
1576 st->print("OS:"); | |
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1577 st->print("Bsd"); |
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1578 |
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1579 os::Posix::print_uname_info(st); |
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1580 |
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1581 os::Posix::print_rlimit_info(st); |
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1582 |
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1583 os::Posix::print_load_average(st); |
3960 | 1584 } |
1585 | |
1586 void os::pd_print_cpu_info(outputStream* st) { | |
1587 // Nothing to do for now. | |
1588 } | |
1589 | |
1590 void os::print_memory_info(outputStream* st) { | |
1591 | |
1592 st->print("Memory:"); | |
1593 st->print(" %dk page", os::vm_page_size()>>10); | |
1594 | |
1595 st->print(", physical " UINT64_FORMAT "k", | |
1596 os::physical_memory() >> 10); | |
1597 st->print("(" UINT64_FORMAT "k free)", | |
1598 os::available_memory() >> 10); | |
1599 st->cr(); | |
1600 | |
1601 // meminfo | |
1602 st->print("\n/proc/meminfo:\n"); | |
1603 _print_ascii_file("/proc/meminfo", st); | |
1604 st->cr(); | |
1605 } | |
1606 | |
1607 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
1608 // but they're the same for all the bsd arch that we support | |
1609 // and they're the same for solaris but there's no common place to put this. | |
1610 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
1611 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
1612 "ILL_COPROC", "ILL_BADSTK" }; | |
1613 | |
1614 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
1615 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
1616 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
1617 | |
1618 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
1619 | |
1620 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
1621 | |
1622 void os::print_siginfo(outputStream* st, void* siginfo) { | |
1623 st->print("siginfo:"); | |
1624 | |
1625 const int buflen = 100; | |
1626 char buf[buflen]; | |
1627 siginfo_t *si = (siginfo_t*)siginfo; | |
1628 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
1629 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
1630 st->print("si_errno=%s", buf); | |
1631 } else { | |
1632 st->print("si_errno=%d", si->si_errno); | |
1633 } | |
1634 const int c = si->si_code; | |
1635 assert(c > 0, "unexpected si_code"); | |
1636 switch (si->si_signo) { | |
1637 case SIGILL: | |
1638 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
1639 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1640 break; | |
1641 case SIGFPE: | |
1642 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
1643 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1644 break; | |
1645 case SIGSEGV: | |
1646 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
1647 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1648 break; | |
1649 case SIGBUS: | |
1650 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
1651 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1652 break; | |
1653 default: | |
1654 st->print(", si_code=%d", si->si_code); | |
1655 // no si_addr | |
1656 } | |
1657 | |
1658 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
1659 UseSharedSpaces) { | |
1660 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
1661 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
1662 st->print("\n\nError accessing class data sharing archive." \ | |
1663 " Mapped file inaccessible during execution, " \ | |
1664 " possible disk/network problem."); | |
1665 } | |
1666 } | |
1667 st->cr(); | |
1668 } | |
1669 | |
1670 | |
1671 static void print_signal_handler(outputStream* st, int sig, | |
1672 char* buf, size_t buflen); | |
1673 | |
1674 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1675 st->print_cr("Signal Handlers:"); | |
1676 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1677 print_signal_handler(st, SIGBUS , buf, buflen); | |
1678 print_signal_handler(st, SIGFPE , buf, buflen); | |
1679 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1680 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1681 print_signal_handler(st, SIGILL , buf, buflen); | |
1682 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1683 print_signal_handler(st, SR_signum, buf, buflen); | |
1684 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1685 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1686 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1687 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1688 } | |
1689 | |
1690 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1691 | |
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1692 // Find the full path to the current module, libjvm |
3960 | 1693 void os::jvm_path(char *buf, jint buflen) { |
1694 // Error checking. | |
1695 if (buflen < MAXPATHLEN) { | |
1696 assert(false, "must use a large-enough buffer"); | |
1697 buf[0] = '\0'; | |
1698 return; | |
1699 } | |
1700 // Lazy resolve the path to current module. | |
1701 if (saved_jvm_path[0] != 0) { | |
1702 strcpy(buf, saved_jvm_path); | |
1703 return; | |
1704 } | |
1705 | |
1706 char dli_fname[MAXPATHLEN]; | |
1707 bool ret = dll_address_to_library_name( | |
1708 CAST_FROM_FN_PTR(address, os::jvm_path), | |
1709 dli_fname, sizeof(dli_fname), NULL); | |
1710 assert(ret != 0, "cannot locate libjvm"); | |
1711 char *rp = realpath(dli_fname, buf); | |
1712 if (rp == NULL) | |
1713 return; | |
1714 | |
1715 if (Arguments::created_by_gamma_launcher()) { | |
1716 // Support for the gamma launcher. Typical value for buf is | |
4846 | 1717 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
3960 | 1718 // the right place in the string, then assume we are installed in a JDK and |
4846 | 1719 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
1720 // construct a path to the JVM being overridden. | |
1721 | |
3960 | 1722 const char *p = buf + strlen(buf) - 1; |
1723 for (int count = 0; p > buf && count < 5; ++count) { | |
1724 for (--p; p > buf && *p != '/'; --p) | |
1725 /* empty */ ; | |
1726 } | |
1727 | |
1728 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
1729 // Look for JAVA_HOME in the environment. | |
1730 char* java_home_var = ::getenv("JAVA_HOME"); | |
1731 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1732 char* jrelib_p; | |
1733 int len; | |
1734 | |
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1735 // Check the current module name "libjvm" |
3960 | 1736 p = strrchr(buf, '/'); |
1737 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
1738 | |
1739 rp = realpath(java_home_var, buf); | |
1740 if (rp == NULL) | |
1741 return; | |
1742 | |
1743 // determine if this is a legacy image or modules image | |
1744 // modules image doesn't have "jre" subdirectory | |
1745 len = strlen(buf); | |
1746 jrelib_p = buf + len; | |
4846 | 1747 |
1748 // Add the appropriate library subdir | |
1749 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
3960 | 1750 if (0 != access(buf, F_OK)) { |
4846 | 1751 snprintf(jrelib_p, buflen-len, "/lib"); |
3960 | 1752 } |
1753 | |
4846 | 1754 // Add the appropriate client or server subdir |
1755 len = strlen(buf); | |
1756 jrelib_p = buf + len; | |
1757 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
1758 if (0 != access(buf, F_OK)) { | |
1759 snprintf(jrelib_p, buflen-len, ""); | |
1760 } | |
1761 | |
1762 // If the path exists within JAVA_HOME, add the JVM library name | |
1763 // to complete the path to JVM being overridden. Otherwise fallback | |
1764 // to the path to the current library. | |
3960 | 1765 if (0 == access(buf, F_OK)) { |
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1766 // Use current module name "libjvm" |
3960 | 1767 len = strlen(buf); |
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1768 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
3960 | 1769 } else { |
4846 | 1770 // Fall back to path of current library |
3960 | 1771 rp = realpath(dli_fname, buf); |
1772 if (rp == NULL) | |
1773 return; | |
1774 } | |
1775 } | |
1776 } | |
1777 } | |
1778 | |
1779 strcpy(saved_jvm_path, buf); | |
1780 } | |
1781 | |
1782 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1783 // no prefix required, not even "_" | |
1784 } | |
1785 | |
1786 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1787 // no suffix required | |
1788 } | |
1789 | |
1790 //////////////////////////////////////////////////////////////////////////////// | |
1791 // sun.misc.Signal support | |
1792 | |
1793 static volatile jint sigint_count = 0; | |
1794 | |
1795 static void | |
1796 UserHandler(int sig, void *siginfo, void *context) { | |
1797 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1798 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1799 // don't want to flood the manager thread with sem_post requests. | |
1800 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1801 return; | |
1802 | |
1803 // Ctrl-C is pressed during error reporting, likely because the error | |
1804 // handler fails to abort. Let VM die immediately. | |
1805 if (sig == SIGINT && is_error_reported()) { | |
1806 os::die(); | |
1807 } | |
1808 | |
1809 os::signal_notify(sig); | |
1810 } | |
1811 | |
1812 void* os::user_handler() { | |
1813 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1814 } | |
1815 | |
1816 extern "C" { | |
1817 typedef void (*sa_handler_t)(int); | |
1818 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1819 } | |
1820 | |
1821 void* os::signal(int signal_number, void* handler) { | |
1822 struct sigaction sigAct, oldSigAct; | |
1823 | |
1824 sigfillset(&(sigAct.sa_mask)); | |
1825 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1826 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1827 | |
1828 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1829 // -1 means registration failed | |
1830 return (void *)-1; | |
1831 } | |
1832 | |
1833 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1834 } | |
1835 | |
1836 void os::signal_raise(int signal_number) { | |
1837 ::raise(signal_number); | |
1838 } | |
1839 | |
1840 /* | |
1841 * The following code is moved from os.cpp for making this | |
1842 * code platform specific, which it is by its very nature. | |
1843 */ | |
1844 | |
1845 // Will be modified when max signal is changed to be dynamic | |
1846 int os::sigexitnum_pd() { | |
1847 return NSIG; | |
1848 } | |
1849 | |
1850 // a counter for each possible signal value | |
1851 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1852 | |
1853 // Bsd(POSIX) specific hand shaking semaphore. | |
1854 #ifdef __APPLE__ | |
1855 static semaphore_t sig_sem; | |
1856 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) | |
1857 #define SEM_WAIT(sem) semaphore_wait(sem); | |
1858 #define SEM_POST(sem) semaphore_signal(sem); | |
1859 #else | |
1860 static sem_t sig_sem; | |
1861 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) | |
1862 #define SEM_WAIT(sem) sem_wait(&sem); | |
1863 #define SEM_POST(sem) sem_post(&sem); | |
1864 #endif | |
1865 | |
1866 void os::signal_init_pd() { | |
1867 // Initialize signal structures | |
1868 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
1869 | |
1870 // Initialize signal semaphore | |
1871 ::SEM_INIT(sig_sem, 0); | |
1872 } | |
1873 | |
1874 void os::signal_notify(int sig) { | |
1875 Atomic::inc(&pending_signals[sig]); | |
1876 ::SEM_POST(sig_sem); | |
1877 } | |
1878 | |
1879 static int check_pending_signals(bool wait) { | |
1880 Atomic::store(0, &sigint_count); | |
1881 for (;;) { | |
1882 for (int i = 0; i < NSIG + 1; i++) { | |
1883 jint n = pending_signals[i]; | |
1884 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
1885 return i; | |
1886 } | |
1887 } | |
1888 if (!wait) { | |
1889 return -1; | |
1890 } | |
1891 JavaThread *thread = JavaThread::current(); | |
1892 ThreadBlockInVM tbivm(thread); | |
1893 | |
1894 bool threadIsSuspended; | |
1895 do { | |
1896 thread->set_suspend_equivalent(); | |
1897 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
1898 ::SEM_WAIT(sig_sem); | |
1899 | |
1900 // were we externally suspended while we were waiting? | |
1901 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
1902 if (threadIsSuspended) { | |
1903 // | |
1904 // The semaphore has been incremented, but while we were waiting | |
1905 // another thread suspended us. We don't want to continue running | |
1906 // while suspended because that would surprise the thread that | |
1907 // suspended us. | |
1908 // | |
1909 ::SEM_POST(sig_sem); | |
1910 | |
1911 thread->java_suspend_self(); | |
1912 } | |
1913 } while (threadIsSuspended); | |
1914 } | |
1915 } | |
1916 | |
1917 int os::signal_lookup() { | |
1918 return check_pending_signals(false); | |
1919 } | |
1920 | |
1921 int os::signal_wait() { | |
1922 return check_pending_signals(true); | |
1923 } | |
1924 | |
1925 //////////////////////////////////////////////////////////////////////////////// | |
1926 // Virtual Memory | |
1927 | |
1928 int os::vm_page_size() { | |
1929 // Seems redundant as all get out | |
1930 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
1931 return os::Bsd::page_size(); | |
1932 } | |
1933 | |
1934 // Solaris allocates memory by pages. | |
1935 int os::vm_allocation_granularity() { | |
1936 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
1937 return os::Bsd::page_size(); | |
1938 } | |
1939 | |
1940 // Rationale behind this function: | |
1941 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
1942 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
1943 // samples for JITted code. Here we create private executable mapping over the code cache | |
1944 // and then we can use standard (well, almost, as mapping can change) way to provide | |
1945 // info for the reporting script by storing timestamp and location of symbol | |
1946 void bsd_wrap_code(char* base, size_t size) { | |
1947 static volatile jint cnt = 0; | |
1948 | |
1949 if (!UseOprofile) { | |
1950 return; | |
1951 } | |
1952 | |
1953 char buf[PATH_MAX + 1]; | |
1954 int num = Atomic::add(1, &cnt); | |
1955 | |
1956 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
1957 os::get_temp_directory(), os::current_process_id(), num); | |
1958 unlink(buf); | |
1959 | |
1960 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
1961 | |
1962 if (fd != -1) { | |
1963 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
1964 if (rv != (off_t)-1) { | |
1965 if (::write(fd, "", 1) == 1) { | |
1966 mmap(base, size, | |
1967 PROT_READ|PROT_WRITE|PROT_EXEC, | |
1968 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
1969 } | |
1970 } | |
1971 ::close(fd); | |
1972 unlink(buf); | |
1973 } | |
1974 } | |
1975 | |
1976 // NOTE: Bsd kernel does not really reserve the pages for us. | |
1977 // All it does is to check if there are enough free pages | |
1978 // left at the time of mmap(). This could be a potential | |
1979 // problem. | |
6197 | 1980 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
3960 | 1981 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
1982 #ifdef __OpenBSD__ | |
1983 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
1984 return ::mprotect(addr, size, prot) == 0; | |
1985 #else | |
1986 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
1987 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
1988 return res != (uintptr_t) MAP_FAILED; | |
1989 #endif | |
1990 } | |
1991 | |
1992 | |
6197 | 1993 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
3960 | 1994 bool exec) { |
1995 return commit_memory(addr, size, exec); | |
1996 } | |
1997 | |
6197 | 1998 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 1999 } |
2000 | |
6197 | 2001 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2002 ::madvise(addr, bytes, MADV_DONTNEED); |
2003 } | |
2004 | |
2005 void os::numa_make_global(char *addr, size_t bytes) { | |
2006 } | |
2007 | |
2008 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2009 } | |
2010 | |
2011 bool os::numa_topology_changed() { return false; } | |
2012 | |
2013 size_t os::numa_get_groups_num() { | |
2014 return 1; | |
2015 } | |
2016 | |
2017 int os::numa_get_group_id() { | |
2018 return 0; | |
2019 } | |
2020 | |
2021 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2022 if (size > 0) { | |
2023 ids[0] = 0; | |
2024 return 1; | |
2025 } | |
2026 return 0; | |
2027 } | |
2028 | |
2029 bool os::get_page_info(char *start, page_info* info) { | |
2030 return false; | |
2031 } | |
2032 | |
2033 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2034 return end; | |
2035 } | |
2036 | |
2037 | |
6197 | 2038 bool os::pd_uncommit_memory(char* addr, size_t size) { |
3960 | 2039 #ifdef __OpenBSD__ |
2040 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
2041 return ::mprotect(addr, size, PROT_NONE) == 0; | |
2042 #else | |
2043 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
2044 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
2045 return res != (uintptr_t) MAP_FAILED; | |
2046 #endif | |
2047 } | |
2048 | |
6197 | 2049 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
3960 | 2050 return os::commit_memory(addr, size); |
2051 } | |
2052 | |
2053 // If this is a growable mapping, remove the guard pages entirely by | |
2054 // munmap()ping them. If not, just call uncommit_memory(). | |
2055 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2056 return os::uncommit_memory(addr, size); | |
2057 } | |
2058 | |
2059 static address _highest_vm_reserved_address = NULL; | |
2060 | |
2061 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2062 // at 'requested_addr'. If there are existing memory mappings at the same | |
2063 // location, however, they will be overwritten. If 'fixed' is false, | |
2064 // 'requested_addr' is only treated as a hint, the return value may or | |
2065 // may not start from the requested address. Unlike Bsd mmap(), this | |
2066 // function returns NULL to indicate failure. | |
2067 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2068 char * addr; | |
2069 int flags; | |
2070 | |
2071 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2072 if (fixed) { | |
2073 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
2074 flags |= MAP_FIXED; | |
2075 } | |
2076 | |
2077 // Map uncommitted pages PROT_READ and PROT_WRITE, change access | |
2078 // to PROT_EXEC if executable when we commit the page. | |
2079 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, | |
2080 flags, -1, 0); | |
2081 | |
2082 if (addr != MAP_FAILED) { | |
2083 // anon_mmap() should only get called during VM initialization, | |
2084 // don't need lock (actually we can skip locking even it can be called | |
2085 // from multiple threads, because _highest_vm_reserved_address is just a | |
2086 // hint about the upper limit of non-stack memory regions.) | |
2087 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2088 _highest_vm_reserved_address = (address)addr + bytes; | |
2089 } | |
2090 } | |
2091 | |
2092 return addr == MAP_FAILED ? NULL : addr; | |
2093 } | |
2094 | |
2095 // Don't update _highest_vm_reserved_address, because there might be memory | |
2096 // regions above addr + size. If so, releasing a memory region only creates | |
2097 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2098 // | |
2099 static int anon_munmap(char * addr, size_t size) { | |
2100 return ::munmap(addr, size) == 0; | |
2101 } | |
2102 | |
6197 | 2103 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
3960 | 2104 size_t alignment_hint) { |
2105 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2106 } | |
2107 | |
6197 | 2108 bool os::pd_release_memory(char* addr, size_t size) { |
3960 | 2109 return anon_munmap(addr, size); |
2110 } | |
2111 | |
2112 static address highest_vm_reserved_address() { | |
2113 return _highest_vm_reserved_address; | |
2114 } | |
2115 | |
2116 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
2117 // Bsd wants the mprotect address argument to be page aligned. | |
2118 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
2119 | |
2120 // According to SUSv3, mprotect() should only be used with mappings | |
2121 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2122 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2123 // protection of malloc'ed or statically allocated memory). Check the | |
2124 // caller if you hit this assert. | |
2125 assert(addr == bottom, "sanity check"); | |
2126 | |
2127 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
2128 return ::mprotect(bottom, size, prot) == 0; | |
2129 } | |
2130 | |
2131 // Set protections specified | |
2132 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
2133 bool is_committed) { | |
2134 unsigned int p = 0; | |
2135 switch (prot) { | |
2136 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2137 case MEM_PROT_READ: p = PROT_READ; break; | |
2138 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2139 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2140 default: | |
2141 ShouldNotReachHere(); | |
2142 } | |
2143 // is_committed is unused. | |
2144 return bsd_mprotect(addr, bytes, p); | |
2145 } | |
2146 | |
2147 bool os::guard_memory(char* addr, size_t size) { | |
2148 return bsd_mprotect(addr, size, PROT_NONE); | |
2149 } | |
2150 | |
2151 bool os::unguard_memory(char* addr, size_t size) { | |
2152 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
2153 } | |
2154 | |
2155 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
6918 | 2156 return false; |
3960 | 2157 } |
2158 | |
2159 /* | |
2160 * Set the coredump_filter bits to include largepages in core dump (bit 6) | |
2161 * | |
2162 * From the coredump_filter documentation: | |
2163 * | |
2164 * - (bit 0) anonymous private memory | |
2165 * - (bit 1) anonymous shared memory | |
2166 * - (bit 2) file-backed private memory | |
2167 * - (bit 3) file-backed shared memory | |
2168 * - (bit 4) ELF header pages in file-backed private memory areas (it is | |
2169 * effective only if the bit 2 is cleared) | |
2170 * - (bit 5) hugetlb private memory | |
2171 * - (bit 6) hugetlb shared memory | |
2172 */ | |
2173 static void set_coredump_filter(void) { | |
2174 FILE *f; | |
2175 long cdm; | |
2176 | |
2177 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { | |
2178 return; | |
2179 } | |
2180 | |
2181 if (fscanf(f, "%lx", &cdm) != 1) { | |
2182 fclose(f); | |
2183 return; | |
2184 } | |
2185 | |
2186 rewind(f); | |
2187 | |
2188 if ((cdm & LARGEPAGES_BIT) == 0) { | |
2189 cdm |= LARGEPAGES_BIT; | |
2190 fprintf(f, "%#lx", cdm); | |
2191 } | |
2192 | |
2193 fclose(f); | |
2194 } | |
2195 | |
2196 // Large page support | |
2197 | |
2198 static size_t _large_page_size = 0; | |
2199 | |
2200 void os::large_page_init() { | |
2201 } | |
2202 | |
2203 | |
2204 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
2205 // "exec" is passed in but not used. Creating the shared image for | |
2206 // the code cache doesn't have an SHM_X executable permission to check. | |
2207 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
2208 | |
2209 key_t key = IPC_PRIVATE; | |
2210 char *addr; | |
2211 | |
2212 bool warn_on_failure = UseLargePages && | |
2213 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2214 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2215 ); | |
2216 char msg[128]; | |
2217 | |
2218 // Create a large shared memory region to attach to based on size. | |
2219 // Currently, size is the total size of the heap | |
2220 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
2221 if (shmid == -1) { | |
2222 // Possible reasons for shmget failure: | |
2223 // 1. shmmax is too small for Java heap. | |
2224 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2225 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2226 // 2. not enough large page memory. | |
2227 // > check available large pages: cat /proc/meminfo | |
2228 // > increase amount of large pages: | |
2229 // echo new_value > /proc/sys/vm/nr_hugepages | |
2230 // Note 1: different Bsd may use different name for this property, | |
2231 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2232 // Note 2: it's possible there's enough physical memory available but | |
2233 // they are so fragmented after a long run that they can't | |
2234 // coalesce into large pages. Try to reserve large pages when | |
2235 // the system is still "fresh". | |
2236 if (warn_on_failure) { | |
2237 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2238 warning(msg); | |
2239 } | |
2240 return NULL; | |
2241 } | |
2242 | |
2243 // attach to the region | |
2244 addr = (char*)shmat(shmid, req_addr, 0); | |
2245 int err = errno; | |
2246 | |
2247 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2248 // will be deleted when it's detached by shmdt() or when the process | |
2249 // terminates. If shmat() is not successful this will remove the shared | |
2250 // segment immediately. | |
2251 shmctl(shmid, IPC_RMID, NULL); | |
2252 | |
2253 if ((intptr_t)addr == -1) { | |
2254 if (warn_on_failure) { | |
2255 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2256 warning(msg); | |
2257 } | |
2258 return NULL; | |
2259 } | |
2260 | |
2261 return addr; | |
2262 } | |
2263 | |
2264 bool os::release_memory_special(char* base, size_t bytes) { | |
2265 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
2266 int rslt = shmdt(base); | |
2267 return rslt == 0; | |
2268 } | |
2269 | |
2270 size_t os::large_page_size() { | |
2271 return _large_page_size; | |
2272 } | |
2273 | |
2274 // HugeTLBFS allows application to commit large page memory on demand; | |
2275 // with SysV SHM the entire memory region must be allocated as shared | |
2276 // memory. | |
2277 bool os::can_commit_large_page_memory() { | |
2278 return UseHugeTLBFS; | |
2279 } | |
2280 | |
2281 bool os::can_execute_large_page_memory() { | |
2282 return UseHugeTLBFS; | |
2283 } | |
2284 | |
2285 // Reserve memory at an arbitrary address, only if that area is | |
2286 // available (and not reserved for something else). | |
2287 | |
6197 | 2288 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
3960 | 2289 const int max_tries = 10; |
2290 char* base[max_tries]; | |
2291 size_t size[max_tries]; | |
2292 const size_t gap = 0x000000; | |
2293 | |
2294 // Assert only that the size is a multiple of the page size, since | |
2295 // that's all that mmap requires, and since that's all we really know | |
2296 // about at this low abstraction level. If we need higher alignment, | |
2297 // we can either pass an alignment to this method or verify alignment | |
2298 // in one of the methods further up the call chain. See bug 5044738. | |
2299 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
2300 | |
2301 // Repeatedly allocate blocks until the block is allocated at the | |
2302 // right spot. Give up after max_tries. Note that reserve_memory() will | |
2303 // automatically update _highest_vm_reserved_address if the call is | |
2304 // successful. The variable tracks the highest memory address every reserved | |
2305 // by JVM. It is used to detect heap-stack collision if running with | |
2306 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
2307 // space than needed, it could confuse the collision detecting code. To | |
2308 // solve the problem, save current _highest_vm_reserved_address and | |
2309 // calculate the correct value before return. | |
2310 address old_highest = _highest_vm_reserved_address; | |
2311 | |
2312 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
2313 // if kernel honors the hint then we can return immediately. | |
2314 char * addr = anon_mmap(requested_addr, bytes, false); | |
2315 if (addr == requested_addr) { | |
2316 return requested_addr; | |
2317 } | |
2318 | |
2319 if (addr != NULL) { | |
2320 // mmap() is successful but it fails to reserve at the requested address | |
2321 anon_munmap(addr, bytes); | |
2322 } | |
2323 | |
2324 int i; | |
2325 for (i = 0; i < max_tries; ++i) { | |
2326 base[i] = reserve_memory(bytes); | |
2327 | |
2328 if (base[i] != NULL) { | |
2329 // Is this the block we wanted? | |
2330 if (base[i] == requested_addr) { | |
2331 size[i] = bytes; | |
2332 break; | |
2333 } | |
2334 | |
2335 // Does this overlap the block we wanted? Give back the overlapped | |
2336 // parts and try again. | |
2337 | |
2338 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
2339 if (top_overlap >= 0 && top_overlap < bytes) { | |
2340 unmap_memory(base[i], top_overlap); | |
2341 base[i] += top_overlap; | |
2342 size[i] = bytes - top_overlap; | |
2343 } else { | |
2344 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
2345 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
2346 unmap_memory(requested_addr, bottom_overlap); | |
2347 size[i] = bytes - bottom_overlap; | |
2348 } else { | |
2349 size[i] = bytes; | |
2350 } | |
2351 } | |
2352 } | |
2353 } | |
2354 | |
2355 // Give back the unused reserved pieces. | |
2356 | |
2357 for (int j = 0; j < i; ++j) { | |
2358 if (base[j] != NULL) { | |
2359 unmap_memory(base[j], size[j]); | |
2360 } | |
2361 } | |
2362 | |
2363 if (i < max_tries) { | |
2364 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
2365 return requested_addr; | |
2366 } else { | |
2367 _highest_vm_reserved_address = old_highest; | |
2368 return NULL; | |
2369 } | |
2370 } | |
2371 | |
2372 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2373 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
2374 } | |
2375 | |
2376 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
2377 // Solaris uses poll(), bsd uses park(). | |
2378 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
2379 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
2380 // SIGSEGV, see 4355769. | |
2381 | |
2382 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2383 assert(thread == Thread::current(), "thread consistency check"); | |
2384 | |
2385 ParkEvent * const slp = thread->_SleepEvent ; | |
2386 slp->reset() ; | |
2387 OrderAccess::fence() ; | |
2388 | |
2389 if (interruptible) { | |
2390 jlong prevtime = javaTimeNanos(); | |
2391 | |
2392 for (;;) { | |
2393 if (os::is_interrupted(thread, true)) { | |
2394 return OS_INTRPT; | |
2395 } | |
2396 | |
2397 jlong newtime = javaTimeNanos(); | |
2398 | |
2399 if (newtime - prevtime < 0) { | |
2400 // time moving backwards, should only happen if no monotonic clock | |
2401 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2402 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2403 } else { | |
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2404 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2405 } |
2406 | |
2407 if(millis <= 0) { | |
2408 return OS_OK; | |
2409 } | |
2410 | |
2411 prevtime = newtime; | |
2412 | |
2413 { | |
2414 assert(thread->is_Java_thread(), "sanity check"); | |
2415 JavaThread *jt = (JavaThread *) thread; | |
2416 ThreadBlockInVM tbivm(jt); | |
2417 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2418 | |
2419 jt->set_suspend_equivalent(); | |
2420 // cleared by handle_special_suspend_equivalent_condition() or | |
2421 // java_suspend_self() via check_and_wait_while_suspended() | |
2422 | |
2423 slp->park(millis); | |
2424 | |
2425 // were we externally suspended while we were waiting? | |
2426 jt->check_and_wait_while_suspended(); | |
2427 } | |
2428 } | |
2429 } else { | |
2430 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2431 jlong prevtime = javaTimeNanos(); | |
2432 | |
2433 for (;;) { | |
2434 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2435 // the 1st iteration ... | |
2436 jlong newtime = javaTimeNanos(); | |
2437 | |
2438 if (newtime - prevtime < 0) { | |
2439 // time moving backwards, should only happen if no monotonic clock | |
2440 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2441 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2442 } else { | |
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2443 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2444 } |
2445 | |
2446 if(millis <= 0) break ; | |
2447 | |
2448 prevtime = newtime; | |
2449 slp->park(millis); | |
2450 } | |
2451 return OS_OK ; | |
2452 } | |
2453 } | |
2454 | |
2455 int os::naked_sleep() { | |
2456 // %% make the sleep time an integer flag. for now use 1 millisec. | |
2457 return os::sleep(Thread::current(), 1, false); | |
2458 } | |
2459 | |
2460 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2461 void os::infinite_sleep() { | |
2462 while (true) { // sleep forever ... | |
2463 ::sleep(100); // ... 100 seconds at a time | |
2464 } | |
2465 } | |
2466 | |
2467 // Used to convert frequent JVM_Yield() to nops | |
2468 bool os::dont_yield() { | |
2469 return DontYieldALot; | |
2470 } | |
2471 | |
2472 void os::yield() { | |
2473 sched_yield(); | |
2474 } | |
2475 | |
2476 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
2477 | |
2478 void os::yield_all(int attempts) { | |
2479 // Yields to all threads, including threads with lower priorities | |
2480 // Threads on Bsd are all with same priority. The Solaris style | |
2481 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2482 sched_yield(); | |
2483 } | |
2484 | |
2485 // Called from the tight loops to possibly influence time-sharing heuristics | |
2486 void os::loop_breaker(int attempts) { | |
2487 os::yield_all(attempts); | |
2488 } | |
2489 | |
2490 //////////////////////////////////////////////////////////////////////////////// | |
2491 // thread priority support | |
2492 | |
2493 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
2494 // only supports dynamic priority, static priority must be zero. For real-time | |
2495 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
2496 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
2497 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
2498 // of 5 runs - Sep 2005). | |
2499 // | |
2500 // The following code actually changes the niceness of kernel-thread/LWP. It | |
2501 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
2502 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
2503 // threads. It has always been the case, but could change in the future. For | |
2504 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
2505 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
2506 | |
6918 | 2507 #if !defined(__APPLE__) |
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2508 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2509 19, // 0 Entry should never be used |
2510 | |
2511 0, // 1 MinPriority | |
2512 3, // 2 | |
2513 6, // 3 | |
2514 | |
4854
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2515 10, // 4 |
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2516 15, // 5 NormPriority |
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2517 18, // 6 |
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2518 |
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2519 21, // 7 |
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2520 25, // 8 |
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2521 28, // 9 NearMaxPriority |
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2522 |
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2523 31, // 10 MaxPriority |
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2524 |
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2525 31 // 11 CriticalPriority |
3960 | 2526 }; |
6918 | 2527 #else |
3960 | 2528 /* Using Mach high-level priority assignments */ |
4854
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2529 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2530 0, // 0 Entry should never be used (MINPRI_USER) |
2531 | |
2532 27, // 1 MinPriority | |
2533 28, // 2 | |
2534 29, // 3 | |
2535 | |
2536 30, // 4 | |
2537 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
2538 32, // 6 | |
2539 | |
2540 33, // 7 | |
2541 34, // 8 | |
2542 35, // 9 NearMaxPriority | |
2543 | |
4854
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2544 36, // 10 MaxPriority |
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2545 |
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2546 36 // 11 CriticalPriority |
3960 | 2547 }; |
2548 #endif | |
2549 | |
2550 static int prio_init() { | |
2551 if (ThreadPriorityPolicy == 1) { | |
2552 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
2553 // if effective uid is not root. Perhaps, a more elegant way of doing | |
2554 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
2555 if (geteuid() != 0) { | |
2556 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
2557 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
2558 } | |
2559 ThreadPriorityPolicy = 0; | |
2560 } | |
2561 } | |
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2562 if (UseCriticalJavaThreadPriority) { |
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2563 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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2564 } |
3960 | 2565 return 0; |
2566 } | |
2567 | |
2568 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2569 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
2570 | |
2571 #ifdef __OpenBSD__ | |
2572 // OpenBSD pthread_setprio starves low priority threads | |
2573 return OS_OK; | |
2574 #elif defined(__FreeBSD__) | |
2575 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
2576 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2577 struct sched_param sp; | |
2578 int policy; | |
2579 pthread_t self = pthread_self(); | |
2580 | |
2581 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
2582 return OS_ERR; | |
2583 | |
2584 sp.sched_priority = newpri; | |
2585 if (pthread_setschedparam(self, policy, &sp) != 0) | |
2586 return OS_ERR; | |
2587 | |
2588 return OS_OK; | |
2589 #else | |
2590 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
2591 return (ret == 0) ? OS_OK : OS_ERR; | |
2592 #endif | |
2593 } | |
2594 | |
2595 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2596 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
2597 *priority_ptr = java_to_os_priority[NormPriority]; | |
2598 return OS_OK; | |
2599 } | |
2600 | |
2601 errno = 0; | |
2602 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
2603 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
2604 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2605 int policy; | |
2606 struct sched_param sp; | |
2607 | |
2608 pthread_getschedparam(pthread_self(), &policy, &sp); | |
2609 *priority_ptr = sp.sched_priority; | |
2610 #else | |
2611 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
2612 #endif | |
2613 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
2614 } | |
2615 | |
2616 // Hint to the underlying OS that a task switch would not be good. | |
2617 // Void return because it's a hint and can fail. | |
2618 void os::hint_no_preempt() {} | |
2619 | |
2620 //////////////////////////////////////////////////////////////////////////////// | |
2621 // suspend/resume support | |
2622 | |
2623 // the low-level signal-based suspend/resume support is a remnant from the | |
2624 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2625 // within hotspot. Now there is a single use-case for this: | |
2626 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2627 // that runs in the watcher thread. | |
2628 // The remaining code is greatly simplified from the more general suspension | |
2629 // code that used to be used. | |
2630 // | |
2631 // The protocol is quite simple: | |
2632 // - suspend: | |
2633 // - sends a signal to the target thread | |
2634 // - polls the suspend state of the osthread using a yield loop | |
2635 // - target thread signal handler (SR_handler) sets suspend state | |
2636 // and blocks in sigsuspend until continued | |
2637 // - resume: | |
2638 // - sets target osthread state to continue | |
2639 // - sends signal to end the sigsuspend loop in the SR_handler | |
2640 // | |
2641 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
2642 // | |
2643 | |
2644 static void resume_clear_context(OSThread *osthread) { | |
2645 osthread->set_ucontext(NULL); | |
2646 osthread->set_siginfo(NULL); | |
2647 | |
2648 // notify the suspend action is completed, we have now resumed | |
2649 osthread->sr.clear_suspended(); | |
2650 } | |
2651 | |
2652 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
2653 osthread->set_ucontext(context); | |
2654 osthread->set_siginfo(siginfo); | |
2655 } | |
2656 | |
2657 // | |
2658 // Handler function invoked when a thread's execution is suspended or | |
2659 // resumed. We have to be careful that only async-safe functions are | |
2660 // called here (Note: most pthread functions are not async safe and | |
2661 // should be avoided.) | |
2662 // | |
2663 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
2664 // interface point of view, but sigwait() prevents the signal hander | |
2665 // from being run. libpthread would get very confused by not having | |
2666 // its signal handlers run and prevents sigwait()'s use with the | |
2667 // mutex granting granting signal. | |
2668 // | |
2669 // Currently only ever called on the VMThread | |
2670 // | |
2671 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
2672 // Save and restore errno to avoid confusing native code with EINTR | |
2673 // after sigsuspend. | |
2674 int old_errno = errno; | |
2675 | |
2676 Thread* thread = Thread::current(); | |
2677 OSThread* osthread = thread->osthread(); | |
2678 assert(thread->is_VM_thread(), "Must be VMThread"); | |
2679 // read current suspend action | |
2680 int action = osthread->sr.suspend_action(); | |
2681 if (action == SR_SUSPEND) { | |
2682 suspend_save_context(osthread, siginfo, context); | |
2683 | |
2684 // Notify the suspend action is about to be completed. do_suspend() | |
2685 // waits until SR_SUSPENDED is set and then returns. We will wait | |
2686 // here for a resume signal and that completes the suspend-other | |
2687 // action. do_suspend/do_resume is always called as a pair from | |
2688 // the same thread - so there are no races | |
2689 | |
2690 // notify the caller | |
2691 osthread->sr.set_suspended(); | |
2692 | |
2693 sigset_t suspend_set; // signals for sigsuspend() | |
2694 | |
2695 // get current set of blocked signals and unblock resume signal | |
2696 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
2697 sigdelset(&suspend_set, SR_signum); | |
2698 | |
2699 // wait here until we are resumed | |
2700 do { | |
2701 sigsuspend(&suspend_set); | |
2702 // ignore all returns until we get a resume signal | |
2703 } while (osthread->sr.suspend_action() != SR_CONTINUE); | |
2704 | |
2705 resume_clear_context(osthread); | |
2706 | |
2707 } else { | |
2708 assert(action == SR_CONTINUE, "unexpected sr action"); | |
2709 // nothing special to do - just leave the handler | |
2710 } | |
2711 | |
2712 errno = old_errno; | |
2713 } | |
2714 | |
2715 | |
2716 static int SR_initialize() { | |
2717 struct sigaction act; | |
2718 char *s; | |
2719 /* Get signal number to use for suspend/resume */ | |
2720 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
2721 int sig = ::strtol(s, 0, 10); | |
2722 if (sig > 0 || sig < NSIG) { | |
2723 SR_signum = sig; | |
2724 } | |
2725 } | |
2726 | |
2727 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
2728 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
2729 | |
2730 sigemptyset(&SR_sigset); | |
2731 sigaddset(&SR_sigset, SR_signum); | |
2732 | |
2733 /* Set up signal handler for suspend/resume */ | |
2734 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
2735 act.sa_handler = (void (*)(int)) SR_handler; | |
2736 | |
2737 // SR_signum is blocked by default. | |
2738 // 4528190 - We also need to block pthread restart signal (32 on all | |
2739 // supported Bsd platforms). Note that BsdThreads need to block | |
2740 // this signal for all threads to work properly. So we don't have | |
2741 // to use hard-coded signal number when setting up the mask. | |
2742 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
2743 | |
2744 if (sigaction(SR_signum, &act, 0) == -1) { | |
2745 return -1; | |
2746 } | |
2747 | |
2748 // Save signal flag | |
2749 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
2750 return 0; | |
2751 } | |
2752 | |
2753 static int SR_finalize() { | |
2754 return 0; | |
2755 } | |
2756 | |
2757 | |
2758 // returns true on success and false on error - really an error is fatal | |
2759 // but this seems the normal response to library errors | |
2760 static bool do_suspend(OSThread* osthread) { | |
2761 // mark as suspended and send signal | |
2762 osthread->sr.set_suspend_action(SR_SUSPEND); | |
2763 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2764 assert_status(status == 0, status, "pthread_kill"); | |
2765 | |
2766 // check status and wait until notified of suspension | |
2767 if (status == 0) { | |
2768 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
2769 os::yield_all(i); | |
2770 } | |
2771 osthread->sr.set_suspend_action(SR_NONE); | |
2772 return true; | |
2773 } | |
2774 else { | |
2775 osthread->sr.set_suspend_action(SR_NONE); | |
2776 return false; | |
2777 } | |
2778 } | |
2779 | |
2780 static void do_resume(OSThread* osthread) { | |
2781 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
2782 osthread->sr.set_suspend_action(SR_CONTINUE); | |
2783 | |
2784 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2785 assert_status(status == 0, status, "pthread_kill"); | |
2786 // check status and wait unit notified of resumption | |
2787 if (status == 0) { | |
2788 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
2789 os::yield_all(i); | |
2790 } | |
2791 } | |
2792 osthread->sr.set_suspend_action(SR_NONE); | |
2793 } | |
2794 | |
2795 //////////////////////////////////////////////////////////////////////////////// | |
2796 // interrupt support | |
2797 | |
2798 void os::interrupt(Thread* thread) { | |
2799 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2800 "possibility of dangling Thread pointer"); | |
2801 | |
2802 OSThread* osthread = thread->osthread(); | |
2803 | |
2804 if (!osthread->interrupted()) { | |
2805 osthread->set_interrupted(true); | |
2806 // More than one thread can get here with the same value of osthread, | |
2807 // resulting in multiple notifications. We do, however, want the store | |
2808 // to interrupted() to be visible to other threads before we execute unpark(). | |
2809 OrderAccess::fence(); | |
2810 ParkEvent * const slp = thread->_SleepEvent ; | |
2811 if (slp != NULL) slp->unpark() ; | |
2812 } | |
2813 | |
2814 // For JSR166. Unpark even if interrupt status already was set | |
2815 if (thread->is_Java_thread()) | |
2816 ((JavaThread*)thread)->parker()->unpark(); | |
2817 | |
2818 ParkEvent * ev = thread->_ParkEvent ; | |
2819 if (ev != NULL) ev->unpark() ; | |
2820 | |
2821 } | |
2822 | |
2823 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
2824 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2825 "possibility of dangling Thread pointer"); | |
2826 | |
2827 OSThread* osthread = thread->osthread(); | |
2828 | |
2829 bool interrupted = osthread->interrupted(); | |
2830 | |
2831 if (interrupted && clear_interrupted) { | |
2832 osthread->set_interrupted(false); | |
2833 // consider thread->_SleepEvent->reset() ... optional optimization | |
2834 } | |
2835 | |
2836 return interrupted; | |
2837 } | |
2838 | |
2839 /////////////////////////////////////////////////////////////////////////////////// | |
2840 // signal handling (except suspend/resume) | |
2841 | |
2842 // This routine may be used by user applications as a "hook" to catch signals. | |
2843 // The user-defined signal handler must pass unrecognized signals to this | |
2844 // routine, and if it returns true (non-zero), then the signal handler must | |
2845 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
2846 // routine will never retun false (zero), but instead will execute a VM panic | |
2847 // routine kill the process. | |
2848 // | |
2849 // If this routine returns false, it is OK to call it again. This allows | |
2850 // the user-defined signal handler to perform checks either before or after | |
2851 // the VM performs its own checks. Naturally, the user code would be making | |
2852 // a serious error if it tried to handle an exception (such as a null check | |
2853 // or breakpoint) that the VM was generating for its own correct operation. | |
2854 // | |
2855 // This routine may recognize any of the following kinds of signals: | |
2856 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
2857 // It should be consulted by handlers for any of those signals. | |
2858 // | |
2859 // The caller of this routine must pass in the three arguments supplied | |
2860 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
2861 // field of the structure passed to sigaction(). This routine assumes that | |
2862 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
2863 // | |
2864 // Note that the VM will print warnings if it detects conflicting signal | |
2865 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
2866 // | |
2867 extern "C" JNIEXPORT int | |
2868 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
2869 void* ucontext, int abort_if_unrecognized); | |
2870 | |
2871 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
2872 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
2873 JVM_handle_bsd_signal(sig, info, uc, true); | |
2874 } | |
2875 | |
2876 | |
2877 // This boolean allows users to forward their own non-matching signals | |
2878 // to JVM_handle_bsd_signal, harmlessly. | |
2879 bool os::Bsd::signal_handlers_are_installed = false; | |
2880 | |
2881 // For signal-chaining | |
2882 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
2883 unsigned int os::Bsd::sigs = 0; | |
2884 bool os::Bsd::libjsig_is_loaded = false; | |
2885 typedef struct sigaction *(*get_signal_t)(int); | |
2886 get_signal_t os::Bsd::get_signal_action = NULL; | |
2887 | |
2888 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
2889 struct sigaction *actp = NULL; | |
2890 | |
2891 if (libjsig_is_loaded) { | |
2892 // Retrieve the old signal handler from libjsig | |
2893 actp = (*get_signal_action)(sig); | |
2894 } | |
2895 if (actp == NULL) { | |
2896 // Retrieve the preinstalled signal handler from jvm | |
2897 actp = get_preinstalled_handler(sig); | |
2898 } | |
2899 | |
2900 return actp; | |
2901 } | |
2902 | |
2903 static bool call_chained_handler(struct sigaction *actp, int sig, | |
2904 siginfo_t *siginfo, void *context) { | |
2905 // Call the old signal handler | |
2906 if (actp->sa_handler == SIG_DFL) { | |
2907 // It's more reasonable to let jvm treat it as an unexpected exception | |
2908 // instead of taking the default action. | |
2909 return false; | |
2910 } else if (actp->sa_handler != SIG_IGN) { | |
2911 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
2912 // automaticlly block the signal | |
2913 sigaddset(&(actp->sa_mask), sig); | |
2914 } | |
2915 | |
2916 sa_handler_t hand; | |
2917 sa_sigaction_t sa; | |
2918 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
2919 // retrieve the chained handler | |
2920 if (siginfo_flag_set) { | |
2921 sa = actp->sa_sigaction; | |
2922 } else { | |
2923 hand = actp->sa_handler; | |
2924 } | |
2925 | |
2926 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
2927 actp->sa_handler = SIG_DFL; | |
2928 } | |
2929 | |
2930 // try to honor the signal mask | |
2931 sigset_t oset; | |
2932 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
2933 | |
2934 // call into the chained handler | |
2935 if (siginfo_flag_set) { | |
2936 (*sa)(sig, siginfo, context); | |
2937 } else { | |
2938 (*hand)(sig); | |
2939 } | |
2940 | |
2941 // restore the signal mask | |
2942 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
2943 } | |
2944 // Tell jvm's signal handler the signal is taken care of. | |
2945 return true; | |
2946 } | |
2947 | |
2948 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
2949 bool chained = false; | |
2950 // signal-chaining | |
2951 if (UseSignalChaining) { | |
2952 struct sigaction *actp = get_chained_signal_action(sig); | |
2953 if (actp != NULL) { | |
2954 chained = call_chained_handler(actp, sig, siginfo, context); | |
2955 } | |
2956 } | |
2957 return chained; | |
2958 } | |
2959 | |
2960 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
2961 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
2962 return &sigact[sig]; | |
2963 } | |
2964 return NULL; | |
2965 } | |
2966 | |
2967 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
2968 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2969 sigact[sig] = oldAct; | |
2970 sigs |= (unsigned int)1 << sig; | |
2971 } | |
2972 | |
2973 // for diagnostic | |
2974 int os::Bsd::sigflags[MAXSIGNUM]; | |
2975 | |
2976 int os::Bsd::get_our_sigflags(int sig) { | |
2977 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2978 return sigflags[sig]; | |
2979 } | |
2980 | |
2981 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
2982 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2983 sigflags[sig] = flags; | |
2984 } | |
2985 | |
2986 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
2987 // Check for overwrite. | |
2988 struct sigaction oldAct; | |
2989 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
2990 | |
2991 void* oldhand = oldAct.sa_sigaction | |
2992 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
2993 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
2994 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
2995 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
2996 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
2997 if (AllowUserSignalHandlers || !set_installed) { | |
2998 // Do not overwrite; user takes responsibility to forward to us. | |
2999 return; | |
3000 } else if (UseSignalChaining) { | |
3001 // save the old handler in jvm | |
3002 save_preinstalled_handler(sig, oldAct); | |
3003 // libjsig also interposes the sigaction() call below and saves the | |
3004 // old sigaction on it own. | |
3005 } else { | |
3006 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3007 "%#lx for signal %d.", (long)oldhand, sig)); | |
3008 } | |
3009 } | |
3010 | |
3011 struct sigaction sigAct; | |
3012 sigfillset(&(sigAct.sa_mask)); | |
3013 sigAct.sa_handler = SIG_DFL; | |
3014 if (!set_installed) { | |
3015 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3016 } else { | |
3017 sigAct.sa_sigaction = signalHandler; | |
3018 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3019 } | |
3020 // Save flags, which are set by ours | |
3021 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3022 sigflags[sig] = sigAct.sa_flags; | |
3023 | |
3024 int ret = sigaction(sig, &sigAct, &oldAct); | |
3025 assert(ret == 0, "check"); | |
3026 | |
3027 void* oldhand2 = oldAct.sa_sigaction | |
3028 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3029 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3030 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3031 } | |
3032 | |
3033 // install signal handlers for signals that HotSpot needs to | |
3034 // handle in order to support Java-level exception handling. | |
3035 | |
3036 void os::Bsd::install_signal_handlers() { | |
3037 if (!signal_handlers_are_installed) { | |
3038 signal_handlers_are_installed = true; | |
3039 | |
3040 // signal-chaining | |
3041 typedef void (*signal_setting_t)(); | |
3042 signal_setting_t begin_signal_setting = NULL; | |
3043 signal_setting_t end_signal_setting = NULL; | |
3044 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3045 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3046 if (begin_signal_setting != NULL) { | |
3047 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3048 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3049 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3050 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3051 libjsig_is_loaded = true; | |
3052 assert(UseSignalChaining, "should enable signal-chaining"); | |
3053 } | |
3054 if (libjsig_is_loaded) { | |
3055 // Tell libjsig jvm is setting signal handlers | |
3056 (*begin_signal_setting)(); | |
3057 } | |
3058 | |
3059 set_signal_handler(SIGSEGV, true); | |
3060 set_signal_handler(SIGPIPE, true); | |
3061 set_signal_handler(SIGBUS, true); | |
3062 set_signal_handler(SIGILL, true); | |
3063 set_signal_handler(SIGFPE, true); | |
3064 set_signal_handler(SIGXFSZ, true); | |
3065 | |
3066 #if defined(__APPLE__) | |
3067 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
3068 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
3069 // signal handler that's placed on our process by CrashReporter. This disables | |
3070 // CrashReporter-based reporting. | |
3071 // | |
3072 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
3073 // on caught fatal signals. | |
3074 // | |
3075 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
3076 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
3077 // exception handling, while leaving the standard BSD signal handlers functional. | |
3078 kern_return_t kr; | |
3079 kr = task_set_exception_ports(mach_task_self(), | |
3080 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
3081 MACH_PORT_NULL, | |
3082 EXCEPTION_STATE_IDENTITY, | |
3083 MACHINE_THREAD_STATE); | |
3084 | |
3085 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
3086 #endif | |
3087 | |
3088 if (libjsig_is_loaded) { | |
3089 // Tell libjsig jvm finishes setting signal handlers | |
3090 (*end_signal_setting)(); | |
3091 } | |
3092 | |
3093 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3094 // and if UserSignalHandler is installed all bets are off | |
3095 if (CheckJNICalls) { | |
3096 if (libjsig_is_loaded) { | |
3097 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
3098 check_signals = false; | |
3099 } | |
3100 if (AllowUserSignalHandlers) { | |
3101 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
3102 check_signals = false; | |
3103 } | |
3104 } | |
3105 } | |
3106 } | |
3107 | |
3108 | |
3109 ///// | |
3110 // glibc on Bsd platform uses non-documented flag | |
3111 // to indicate, that some special sort of signal | |
3112 // trampoline is used. | |
3113 // We will never set this flag, and we should | |
3114 // ignore this flag in our diagnostic | |
3115 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3116 #undef SIGNIFICANT_SIGNAL_MASK | |
3117 #endif | |
3118 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3119 | |
3120 static const char* get_signal_handler_name(address handler, | |
3121 char* buf, int buflen) { | |
3122 int offset; | |
3123 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3124 if (found) { | |
3125 // skip directory names | |
3126 const char *p1, *p2; | |
3127 p1 = buf; | |
3128 size_t len = strlen(os::file_separator()); | |
3129 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3130 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3131 } else { | |
3132 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3133 } | |
3134 return buf; | |
3135 } | |
3136 | |
3137 static void print_signal_handler(outputStream* st, int sig, | |
3138 char* buf, size_t buflen) { | |
3139 struct sigaction sa; | |
3140 | |
3141 sigaction(sig, NULL, &sa); | |
3142 | |
3143 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3144 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3145 | |
3146 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3147 | |
3148 address handler = (sa.sa_flags & SA_SIGINFO) | |
3149 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3150 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3151 | |
3152 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3153 st->print("SIG_DFL"); | |
3154 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3155 st->print("SIG_IGN"); | |
3156 } else { | |
3157 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3158 } | |
3159 | |
3160 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
3161 | |
3162 address rh = VMError::get_resetted_sighandler(sig); | |
3163 // May be, handler was resetted by VMError? | |
3164 if(rh != NULL) { | |
3165 handler = rh; | |
3166 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3167 } | |
3168 | |
3169 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
3170 | |
3171 // Check: is it our handler? | |
3172 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3173 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3174 // It is our signal handler | |
3175 // check for flags, reset system-used one! | |
3176 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3177 st->print( | |
3178 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3179 os::Bsd::get_our_sigflags(sig)); | |
3180 } | |
3181 } | |
3182 st->cr(); | |
3183 } | |
3184 | |
3185 | |
3186 #define DO_SIGNAL_CHECK(sig) \ | |
3187 if (!sigismember(&check_signal_done, sig)) \ | |
3188 os::Bsd::check_signal_handler(sig) | |
3189 | |
3190 // This method is a periodic task to check for misbehaving JNI applications | |
3191 // under CheckJNI, we can add any periodic checks here | |
3192 | |
3193 void os::run_periodic_checks() { | |
3194 | |
3195 if (check_signals == false) return; | |
3196 | |
3197 // SEGV and BUS if overridden could potentially prevent | |
3198 // generation of hs*.log in the event of a crash, debugging | |
3199 // such a case can be very challenging, so we absolutely | |
3200 // check the following for a good measure: | |
3201 DO_SIGNAL_CHECK(SIGSEGV); | |
3202 DO_SIGNAL_CHECK(SIGILL); | |
3203 DO_SIGNAL_CHECK(SIGFPE); | |
3204 DO_SIGNAL_CHECK(SIGBUS); | |
3205 DO_SIGNAL_CHECK(SIGPIPE); | |
3206 DO_SIGNAL_CHECK(SIGXFSZ); | |
3207 | |
3208 | |
3209 // ReduceSignalUsage allows the user to override these handlers | |
3210 // see comments at the very top and jvm_solaris.h | |
3211 if (!ReduceSignalUsage) { | |
3212 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3213 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3214 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3215 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3216 } | |
3217 | |
3218 DO_SIGNAL_CHECK(SR_signum); | |
3219 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3220 } | |
3221 | |
3222 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3223 | |
3224 static os_sigaction_t os_sigaction = NULL; | |
3225 | |
3226 void os::Bsd::check_signal_handler(int sig) { | |
3227 char buf[O_BUFLEN]; | |
3228 address jvmHandler = NULL; | |
3229 | |
3230 | |
3231 struct sigaction act; | |
3232 if (os_sigaction == NULL) { | |
3233 // only trust the default sigaction, in case it has been interposed | |
3234 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3235 if (os_sigaction == NULL) return; | |
3236 } | |
3237 | |
3238 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3239 | |
3240 | |
3241 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3242 | |
3243 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3244 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3245 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3246 | |
3247 | |
3248 switch(sig) { | |
3249 case SIGSEGV: | |
3250 case SIGBUS: | |
3251 case SIGFPE: | |
3252 case SIGPIPE: | |
3253 case SIGILL: | |
3254 case SIGXFSZ: | |
3255 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3256 break; | |
3257 | |
3258 case SHUTDOWN1_SIGNAL: | |
3259 case SHUTDOWN2_SIGNAL: | |
3260 case SHUTDOWN3_SIGNAL: | |
3261 case BREAK_SIGNAL: | |
3262 jvmHandler = (address)user_handler(); | |
3263 break; | |
3264 | |
3265 case INTERRUPT_SIGNAL: | |
3266 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3267 break; | |
3268 | |
3269 default: | |
3270 if (sig == SR_signum) { | |
3271 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3272 } else { | |
3273 return; | |
3274 } | |
3275 break; | |
3276 } | |
3277 | |
3278 if (thisHandler != jvmHandler) { | |
3279 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3280 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3281 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3282 // No need to check this sig any longer | |
3283 sigaddset(&check_signal_done, sig); | |
3284 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3285 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3286 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
3287 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3288 // No need to check this sig any longer | |
3289 sigaddset(&check_signal_done, sig); | |
3290 } | |
3291 | |
3292 // Dump all the signal | |
3293 if (sigismember(&check_signal_done, sig)) { | |
3294 print_signal_handlers(tty, buf, O_BUFLEN); | |
3295 } | |
3296 } | |
3297 | |
3298 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3299 | |
3300 extern bool signal_name(int signo, char* buf, size_t len); | |
3301 | |
3302 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3303 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3304 // signal | |
3305 if (!signal_name(exception_code, buf, size)) { | |
3306 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3307 } | |
3308 return buf; | |
3309 } else { | |
3310 return NULL; | |
3311 } | |
3312 } | |
3313 | |
3314 // this is called _before_ the most of global arguments have been parsed | |
3315 void os::init(void) { | |
3316 char dummy; /* used to get a guess on initial stack address */ | |
3317 // first_hrtime = gethrtime(); | |
3318 | |
3319 // With BsdThreads the JavaMain thread pid (primordial thread) | |
3320 // is different than the pid of the java launcher thread. | |
3321 // So, on Bsd, the launcher thread pid is passed to the VM | |
3322 // via the sun.java.launcher.pid property. | |
3323 // Use this property instead of getpid() if it was correctly passed. | |
3324 // See bug 6351349. | |
3325 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3326 | |
3327 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3328 | |
3329 clock_tics_per_sec = CLK_TCK; | |
3330 | |
3331 init_random(1234567); | |
3332 | |
3333 ThreadCritical::initialize(); | |
3334 | |
3335 Bsd::set_page_size(getpagesize()); | |
3336 if (Bsd::page_size() == -1) { | |
3337 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
3338 strerror(errno))); | |
3339 } | |
3340 init_page_sizes((size_t) Bsd::page_size()); | |
3341 | |
3342 Bsd::initialize_system_info(); | |
3343 | |
3344 // main_thread points to the aboriginal thread | |
3345 Bsd::_main_thread = pthread_self(); | |
3346 | |
3347 Bsd::clock_init(); | |
3348 initial_time_count = os::elapsed_counter(); | |
3349 | |
3350 #ifdef __APPLE__ | |
3351 // XXXDARWIN | |
3352 // Work around the unaligned VM callbacks in hotspot's | |
3353 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
3354 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
3355 // alignment when doing symbol lookup. To work around this, we force early | |
3356 // binding of all symbols now, thus binding when alignment is known-good. | |
3357 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
3358 #endif | |
3359 } | |
3360 | |
3361 // To install functions for atexit system call | |
3362 extern "C" { | |
3363 static void perfMemory_exit_helper() { | |
3364 perfMemory_exit(); | |
3365 } | |
3366 } | |
3367 | |
3368 // this is called _after_ the global arguments have been parsed | |
3369 jint os::init_2(void) | |
3370 { | |
3371 // Allocate a single page and mark it as readable for safepoint polling | |
3372 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3373 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
3374 | |
3375 os::set_polling_page( polling_page ); | |
3376 | |
3377 #ifndef PRODUCT | |
3378 if(Verbose && PrintMiscellaneous) | |
3379 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
3380 #endif | |
3381 | |
3382 if (!UseMembar) { | |
3383 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3384 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
3385 os::set_memory_serialize_page( mem_serialize_page ); | |
3386 | |
3387 #ifndef PRODUCT | |
3388 if(Verbose && PrintMiscellaneous) | |
3389 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3390 #endif | |
3391 } | |
3392 | |
3393 os::large_page_init(); | |
3394 | |
3395 // initialize suspend/resume support - must do this before signal_sets_init() | |
3396 if (SR_initialize() != 0) { | |
3397 perror("SR_initialize failed"); | |
3398 return JNI_ERR; | |
3399 } | |
3400 | |
3401 Bsd::signal_sets_init(); | |
3402 Bsd::install_signal_handlers(); | |
3403 | |
3404 // Check minimum allowable stack size for thread creation and to initialize | |
3405 // the java system classes, including StackOverflowError - depends on page | |
3406 // size. Add a page for compiler2 recursion in main thread. | |
3407 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3408 // class initialization depending on 32 or 64 bit VM. | |
3409 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
3410 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
3411 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
3412 | |
3413 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3414 if (threadStackSizeInBytes != 0 && | |
3415 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
3416 tty->print_cr("\nThe stack size specified is too small, " | |
3417 "Specify at least %dk", | |
3418 os::Bsd::min_stack_allowed/ K); | |
3419 return JNI_ERR; | |
3420 } | |
3421 | |
3422 // Make the stack size a multiple of the page size so that | |
3423 // the yellow/red zones can be guarded. | |
3424 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
3425 vm_page_size())); | |
3426 | |
3427 if (MaxFDLimit) { | |
3428 // set the number of file descriptors to max. print out error | |
3429 // if getrlimit/setrlimit fails but continue regardless. | |
3430 struct rlimit nbr_files; | |
3431 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3432 if (status != 0) { | |
3433 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3434 perror("os::init_2 getrlimit failed"); | |
3435 } else { | |
3436 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3437 | |
3438 #ifdef __APPLE__ | |
3439 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
3440 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
3441 // be used instead | |
3442 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
3443 #endif | |
3444 | |
3445 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3446 if (status != 0) { | |
3447 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3448 perror("os::init_2 setrlimit failed"); | |
3449 } | |
3450 } | |
3451 } | |
3452 | |
3453 // at-exit methods are called in the reverse order of their registration. | |
3454 // atexit functions are called on return from main or as a result of a | |
3455 // call to exit(3C). There can be only 32 of these functions registered | |
3456 // and atexit() does not set errno. | |
3457 | |
3458 if (PerfAllowAtExitRegistration) { | |
3459 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3460 // atexit functions can be delayed until process exit time, which | |
3461 // can be problematic for embedded VM situations. Embedded VMs should | |
3462 // call DestroyJavaVM() to assure that VM resources are released. | |
3463 | |
3464 // note: perfMemory_exit_helper atexit function may be removed in | |
3465 // the future if the appropriate cleanup code can be added to the | |
3466 // VM_Exit VMOperation's doit method. | |
3467 if (atexit(perfMemory_exit_helper) != 0) { | |
3468 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
3469 } | |
3470 } | |
3471 | |
3472 // initialize thread priority policy | |
3473 prio_init(); | |
3474 | |
4006 | 3475 #ifdef __APPLE__ |
3476 // dynamically link to objective c gc registration | |
3477 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
3478 if (handleLibObjc != NULL) { | |
3479 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
3480 } | |
3481 #endif | |
3482 | |
3960 | 3483 return JNI_OK; |
3484 } | |
3485 | |
3486 // this is called at the end of vm_initialization | |
3487 void os::init_3(void) { } | |
3488 | |
3489 // Mark the polling page as unreadable | |
3490 void os::make_polling_page_unreadable(void) { | |
3491 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
3492 fatal("Could not disable polling page"); | |
3493 }; | |
3494 | |
3495 // Mark the polling page as readable | |
3496 void os::make_polling_page_readable(void) { | |
3497 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
3498 fatal("Could not enable polling page"); | |
3499 } | |
3500 }; | |
3501 | |
3502 int os::active_processor_count() { | |
3503 return _processor_count; | |
3504 } | |
3505 | |
4006 | 3506 void os::set_native_thread_name(const char *name) { |
3507 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
3508 // This is only supported in Snow Leopard and beyond | |
3509 if (name != NULL) { | |
3510 // Add a "Java: " prefix to the name | |
3511 char buf[MAXTHREADNAMESIZE]; | |
3512 snprintf(buf, sizeof(buf), "Java: %s", name); | |
3513 pthread_setname_np(buf); | |
3514 } | |
3515 #endif | |
3516 } | |
3517 | |
3960 | 3518 bool os::distribute_processes(uint length, uint* distribution) { |
3519 // Not yet implemented. | |
3520 return false; | |
3521 } | |
3522 | |
3523 bool os::bind_to_processor(uint processor_id) { | |
3524 // Not yet implemented. | |
3525 return false; | |
3526 } | |
3527 | |
3528 /// | |
3529 | |
3530 // Suspends the target using the signal mechanism and then grabs the PC before | |
3531 // resuming the target. Used by the flat-profiler only | |
3532 ExtendedPC os::get_thread_pc(Thread* thread) { | |
3533 // Make sure that it is called by the watcher for the VMThread | |
3534 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
3535 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
3536 | |
3537 ExtendedPC epc; | |
3538 | |
3539 OSThread* osthread = thread->osthread(); | |
3540 if (do_suspend(osthread)) { | |
3541 if (osthread->ucontext() != NULL) { | |
3542 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); | |
3543 } else { | |
3544 // NULL context is unexpected, double-check this is the VMThread | |
3545 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
3546 } | |
3547 do_resume(osthread); | |
3548 } | |
3549 // failure means pthread_kill failed for some reason - arguably this is | |
3550 // a fatal problem, but such problems are ignored elsewhere | |
3551 | |
3552 return epc; | |
3553 } | |
3554 | |
3555 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
3556 { | |
3557 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
3558 } | |
3559 | |
3560 //////////////////////////////////////////////////////////////////////////////// | |
3561 // debug support | |
3562 | |
3563 static address same_page(address x, address y) { | |
3564 int page_bits = -os::vm_page_size(); | |
3565 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) | |
3566 return x; | |
3567 else if (x > y) | |
3568 return (address)(intptr_t(y) | ~page_bits) + 1; | |
3569 else | |
3570 return (address)(intptr_t(y) & page_bits); | |
3571 } | |
3572 | |
3573 bool os::find(address addr, outputStream* st) { | |
3574 Dl_info dlinfo; | |
3575 memset(&dlinfo, 0, sizeof(dlinfo)); | |
3576 if (dladdr(addr, &dlinfo)) { | |
3577 st->print(PTR_FORMAT ": ", addr); | |
3578 if (dlinfo.dli_sname != NULL) { | |
3579 st->print("%s+%#x", dlinfo.dli_sname, | |
3580 addr - (intptr_t)dlinfo.dli_saddr); | |
3581 } else if (dlinfo.dli_fname) { | |
3582 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
3583 } else { | |
3584 st->print("<absolute address>"); | |
3585 } | |
3586 if (dlinfo.dli_fname) { | |
3587 st->print(" in %s", dlinfo.dli_fname); | |
3588 } | |
3589 if (dlinfo.dli_fbase) { | |
3590 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
3591 } | |
3592 st->cr(); | |
3593 | |
3594 if (Verbose) { | |
3595 // decode some bytes around the PC | |
3596 address begin = same_page(addr-40, addr); | |
3597 address end = same_page(addr+40, addr); | |
3598 address lowest = (address) dlinfo.dli_sname; | |
3599 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
3600 if (begin < lowest) begin = lowest; | |
3601 Dl_info dlinfo2; | |
3602 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
3603 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
3604 end = (address) dlinfo2.dli_saddr; | |
3605 Disassembler::decode(begin, end, st); | |
3606 } | |
3607 return true; | |
3608 } | |
3609 return false; | |
3610 } | |
3611 | |
3612 //////////////////////////////////////////////////////////////////////////////// | |
3613 // misc | |
3614 | |
3615 // This does not do anything on Bsd. This is basically a hook for being | |
3616 // able to use structured exception handling (thread-local exception filters) | |
3617 // on, e.g., Win32. | |
3618 void | |
3619 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
3620 JavaCallArguments* args, Thread* thread) { | |
3621 f(value, method, args, thread); | |
3622 } | |
3623 | |
3624 void os::print_statistics() { | |
3625 } | |
3626 | |
3627 int os::message_box(const char* title, const char* message) { | |
3628 int i; | |
3629 fdStream err(defaultStream::error_fd()); | |
3630 for (i = 0; i < 78; i++) err.print_raw("="); | |
3631 err.cr(); | |
3632 err.print_raw_cr(title); | |
3633 for (i = 0; i < 78; i++) err.print_raw("-"); | |
3634 err.cr(); | |
3635 err.print_raw_cr(message); | |
3636 for (i = 0; i < 78; i++) err.print_raw("="); | |
3637 err.cr(); | |
3638 | |
3639 char buf[16]; | |
3640 // Prevent process from exiting upon "read error" without consuming all CPU | |
3641 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
3642 | |
3643 return buf[0] == 'y' || buf[0] == 'Y'; | |
3644 } | |
3645 | |
3646 int os::stat(const char *path, struct stat *sbuf) { | |
3647 char pathbuf[MAX_PATH]; | |
3648 if (strlen(path) > MAX_PATH - 1) { | |
3649 errno = ENAMETOOLONG; | |
3650 return -1; | |
3651 } | |
3652 os::native_path(strcpy(pathbuf, path)); | |
3653 return ::stat(pathbuf, sbuf); | |
3654 } | |
3655 | |
3656 bool os::check_heap(bool force) { | |
3657 return true; | |
3658 } | |
3659 | |
3660 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
3661 return ::vsnprintf(buf, count, format, args); | |
3662 } | |
3663 | |
3664 // Is a (classpath) directory empty? | |
3665 bool os::dir_is_empty(const char* path) { | |
3666 DIR *dir = NULL; | |
3667 struct dirent *ptr; | |
3668 | |
3669 dir = opendir(path); | |
3670 if (dir == NULL) return true; | |
3671 | |
3672 /* Scan the directory */ | |
3673 bool result = true; | |
3674 char buf[sizeof(struct dirent) + MAX_PATH]; | |
3675 while (result && (ptr = ::readdir(dir)) != NULL) { | |
3676 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
3677 result = false; | |
3678 } | |
3679 } | |
3680 closedir(dir); | |
3681 return result; | |
3682 } | |
3683 | |
3684 // This code originates from JDK's sysOpen and open64_w | |
3685 // from src/solaris/hpi/src/system_md.c | |
3686 | |
3687 #ifndef O_DELETE | |
3688 #define O_DELETE 0x10000 | |
3689 #endif | |
3690 | |
3691 // Open a file. Unlink the file immediately after open returns | |
3692 // if the specified oflag has the O_DELETE flag set. | |
3693 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
3694 | |
3695 int os::open(const char *path, int oflag, int mode) { | |
3696 | |
3697 if (strlen(path) > MAX_PATH - 1) { | |
3698 errno = ENAMETOOLONG; | |
3699 return -1; | |
3700 } | |
3701 int fd; | |
3702 int o_delete = (oflag & O_DELETE); | |
3703 oflag = oflag & ~O_DELETE; | |
3704 | |
3705 fd = ::open(path, oflag, mode); | |
3706 if (fd == -1) return -1; | |
3707 | |
3708 //If the open succeeded, the file might still be a directory | |
3709 { | |
3710 struct stat buf; | |
3711 int ret = ::fstat(fd, &buf); | |
3712 int st_mode = buf.st_mode; | |
3713 | |
3714 if (ret != -1) { | |
3715 if ((st_mode & S_IFMT) == S_IFDIR) { | |
3716 errno = EISDIR; | |
3717 ::close(fd); | |
3718 return -1; | |
3719 } | |
3720 } else { | |
3721 ::close(fd); | |
3722 return -1; | |
3723 } | |
3724 } | |
3725 | |
3726 /* | |
3727 * All file descriptors that are opened in the JVM and not | |
3728 * specifically destined for a subprocess should have the | |
3729 * close-on-exec flag set. If we don't set it, then careless 3rd | |
3730 * party native code might fork and exec without closing all | |
3731 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
3732 * UNIXProcess.c), and this in turn might: | |
3733 * | |
3734 * - cause end-of-file to fail to be detected on some file | |
3735 * descriptors, resulting in mysterious hangs, or | |
3736 * | |
3737 * - might cause an fopen in the subprocess to fail on a system | |
3738 * suffering from bug 1085341. | |
3739 * | |
3740 * (Yes, the default setting of the close-on-exec flag is a Unix | |
3741 * design flaw) | |
3742 * | |
3743 * See: | |
3744 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
3745 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
3746 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
3747 */ | |
3748 #ifdef FD_CLOEXEC | |
3749 { | |
3750 int flags = ::fcntl(fd, F_GETFD); | |
3751 if (flags != -1) | |
3752 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
3753 } | |
3754 #endif | |
3755 | |
3756 if (o_delete != 0) { | |
3757 ::unlink(path); | |
3758 } | |
3759 return fd; | |
3760 } | |
3761 | |
3762 | |
3763 // create binary file, rewriting existing file if required | |
3764 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
3765 int oflags = O_WRONLY | O_CREAT; | |
3766 if (!rewrite_existing) { | |
3767 oflags |= O_EXCL; | |
3768 } | |
3769 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
3770 } | |
3771 | |
3772 // return current position of file pointer | |
3773 jlong os::current_file_offset(int fd) { | |
3774 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
3775 } | |
3776 | |
3777 // move file pointer to the specified offset | |
3778 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
3779 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
3780 } | |
3781 | |
3782 // This code originates from JDK's sysAvailable | |
3783 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
3784 | |
3785 int os::available(int fd, jlong *bytes) { | |
3786 jlong cur, end; | |
3787 int mode; | |
3788 struct stat buf; | |
3789 | |
3790 if (::fstat(fd, &buf) >= 0) { | |
3791 mode = buf.st_mode; | |
3792 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
3793 /* | |
3794 * XXX: is the following call interruptible? If so, this might | |
3795 * need to go through the INTERRUPT_IO() wrapper as for other | |
3796 * blocking, interruptible calls in this file. | |
3797 */ | |
3798 int n; | |
3799 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
3800 *bytes = n; | |
3801 return 1; | |
3802 } | |
3803 } | |
3804 } | |
3805 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
3806 return 0; | |
3807 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
3808 return 0; | |
3809 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
3810 return 0; | |
3811 } | |
3812 *bytes = end - cur; | |
3813 return 1; | |
3814 } | |
3815 | |
3816 int os::socket_available(int fd, jint *pbytes) { | |
3817 if (fd < 0) | |
3818 return OS_OK; | |
3819 | |
3820 int ret; | |
3821 | |
3822 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
3823 | |
3824 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
3825 // is expected to return 0 on failure and 1 on success to the jdk. | |
3826 | |
3827 return (ret == OS_ERR) ? 0 : 1; | |
3828 } | |
3829 | |
3830 // Map a block of memory. | |
6197 | 3831 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 3832 char *addr, size_t bytes, bool read_only, |
3833 bool allow_exec) { | |
3834 int prot; | |
3835 int flags; | |
3836 | |
3837 if (read_only) { | |
3838 prot = PROT_READ; | |
3839 flags = MAP_SHARED; | |
3840 } else { | |
3841 prot = PROT_READ | PROT_WRITE; | |
3842 flags = MAP_PRIVATE; | |
3843 } | |
3844 | |
3845 if (allow_exec) { | |
3846 prot |= PROT_EXEC; | |
3847 } | |
3848 | |
3849 if (addr != NULL) { | |
3850 flags |= MAP_FIXED; | |
3851 } | |
3852 | |
3853 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
3854 fd, file_offset); | |
3855 if (mapped_address == MAP_FAILED) { | |
3856 return NULL; | |
3857 } | |
3858 return mapped_address; | |
3859 } | |
3860 | |
3861 | |
3862 // Remap a block of memory. | |
6197 | 3863 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 3864 char *addr, size_t bytes, bool read_only, |
3865 bool allow_exec) { | |
3866 // same as map_memory() on this OS | |
3867 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
3868 allow_exec); | |
3869 } | |
3870 | |
3871 | |
3872 // Unmap a block of memory. | |
6197 | 3873 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
3960 | 3874 return munmap(addr, bytes) == 0; |
3875 } | |
3876 | |
3877 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
3878 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
3879 // of a thread. | |
3880 // | |
3881 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
3882 // the fast estimate available on the platform. | |
3883 | |
3884 jlong os::current_thread_cpu_time() { | |
3885 #ifdef __APPLE__ | |
3886 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
3887 #endif | |
3888 } | |
3889 | |
3890 jlong os::thread_cpu_time(Thread* thread) { | |
3891 } | |
3892 | |
3893 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
3894 #ifdef __APPLE__ | |
3895 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
3896 #endif | |
3897 } | |
3898 | |
3899 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
3900 #ifdef __APPLE__ | |
3901 struct thread_basic_info tinfo; | |
3902 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
3903 kern_return_t kr; | |
4961
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3904 thread_t mach_thread; |
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4960
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3905 |
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|
3906 mach_thread = thread->osthread()->thread_id(); |
3960 | 3907 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
3908 if (kr != KERN_SUCCESS) | |
3909 return -1; | |
3910 | |
3911 if (user_sys_cpu_time) { | |
3912 jlong nanos; | |
3913 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
3914 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
3915 return nanos; | |
3916 } else { | |
3917 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
3918 } | |
3919 #endif | |
3920 } | |
3921 | |
3922 | |
3923 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
3924 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
3925 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
3926 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
3927 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
3928 } | |
3929 | |
3930 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
3931 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
3932 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
3933 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
3934 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
3935 } | |
3936 | |
3937 bool os::is_thread_cpu_time_supported() { | |
3938 #ifdef __APPLE__ | |
3939 return true; | |
6918 | 3940 #else |
3960 | 3941 return false; |
3942 #endif | |
3943 } | |
3944 | |
3945 // System loadavg support. Returns -1 if load average cannot be obtained. | |
3946 // Bsd doesn't yet have a (official) notion of processor sets, | |
3947 // so just return the system wide load average. | |
3948 int os::loadavg(double loadavg[], int nelem) { | |
3949 return ::getloadavg(loadavg, nelem); | |
3950 } | |
3951 | |
3952 void os::pause() { | |
3953 char filename[MAX_PATH]; | |
3954 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
3955 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
3956 } else { | |
3957 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
3958 } | |
3959 | |
3960 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
3961 if (fd != -1) { | |
3962 struct stat buf; | |
3963 ::close(fd); | |
3964 while (::stat(filename, &buf) == 0) { | |
3965 (void)::poll(NULL, 0, 100); | |
3966 } | |
3967 } else { | |
3968 jio_fprintf(stderr, | |
3969 "Could not open pause file '%s', continuing immediately.\n", filename); | |
3970 } | |
3971 } | |
3972 | |
3973 | |
3974 // Refer to the comments in os_solaris.cpp park-unpark. | |
3975 // | |
3976 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
3977 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
3978 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
3979 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
3980 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
3981 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
3982 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
3983 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
3984 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
3985 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
3986 // of libpthread avoids the problem, but isn't practical. | |
3987 // | |
3988 // Possible remedies: | |
3989 // | |
3990 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
3991 // This is palliative and probabilistic, however. If the thread is preempted | |
3992 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
3993 // than the minimum period may have passed, and the abstime may be stale (in the | |
3994 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
3995 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
3996 // | |
3997 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
3998 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
3999 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4000 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4001 // thread. | |
4002 // | |
4003 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4004 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4005 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4006 // This also works well. In fact it avoids kernel-level scalability impediments | |
4007 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4008 // timers in a graceful fashion. | |
4009 // | |
4010 // 4. When the abstime value is in the past it appears that control returns | |
4011 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4012 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4013 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4014 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4015 // It may be possible to avoid reinitialization by checking the return | |
4016 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4017 // condvar we must establish the invariant that cond_signal() is only called | |
4018 // within critical sections protected by the adjunct mutex. This prevents | |
4019 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4020 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4021 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4022 // | |
4023 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4024 // structure when a condvar is used or initialized. cond_destroy() would | |
4025 // release the helper structure. Our reinitialize-after-timedwait fix | |
4026 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4027 // | |
4028 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4029 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4030 // and only enabling the work-around for vulnerable environments. | |
4031 | |
4032 // utility to compute the abstime argument to timedwait: | |
4033 // millis is the relative timeout time | |
4034 // abstime will be the absolute timeout time | |
4035 // TODO: replace compute_abstime() with unpackTime() | |
4036 | |
4037 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
4038 if (millis < 0) millis = 0; | |
4039 struct timeval now; | |
4040 int status = gettimeofday(&now, NULL); | |
4041 assert(status == 0, "gettimeofday"); | |
4042 jlong seconds = millis / 1000; | |
4043 millis %= 1000; | |
4044 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4045 seconds = 50000000; | |
4046 } | |
4047 abstime->tv_sec = now.tv_sec + seconds; | |
4048 long usec = now.tv_usec + millis * 1000; | |
4049 if (usec >= 1000000) { | |
4050 abstime->tv_sec += 1; | |
4051 usec -= 1000000; | |
4052 } | |
4053 abstime->tv_nsec = usec * 1000; | |
4054 return abstime; | |
4055 } | |
4056 | |
4057 | |
4058 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4059 // Conceptually TryPark() should be equivalent to park(0). | |
4060 | |
4061 int os::PlatformEvent::TryPark() { | |
4062 for (;;) { | |
4063 const int v = _Event ; | |
4064 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4065 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4066 } | |
4067 } | |
4068 | |
4069 void os::PlatformEvent::park() { // AKA "down()" | |
4070 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4071 // may call park(). | |
4072 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4073 int v ; | |
4074 for (;;) { | |
4075 v = _Event ; | |
4076 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4077 } | |
4078 guarantee (v >= 0, "invariant") ; | |
4079 if (v == 0) { | |
4080 // Do this the hard way by blocking ... | |
4081 int status = pthread_mutex_lock(_mutex); | |
4082 assert_status(status == 0, status, "mutex_lock"); | |
4083 guarantee (_nParked == 0, "invariant") ; | |
4084 ++ _nParked ; | |
4085 while (_Event < 0) { | |
4086 status = pthread_cond_wait(_cond, _mutex); | |
4087 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4088 // Treat this the same as if the wait was interrupted | |
4089 if (status == ETIMEDOUT) { status = EINTR; } | |
4090 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4091 } | |
4092 -- _nParked ; | |
4093 | |
4094 // In theory we could move the ST of 0 into _Event past the unlock(), | |
4095 // but then we'd need a MEMBAR after the ST. | |
4096 _Event = 0 ; | |
4097 status = pthread_mutex_unlock(_mutex); | |
4098 assert_status(status == 0, status, "mutex_unlock"); | |
4099 } | |
4100 guarantee (_Event >= 0, "invariant") ; | |
4101 } | |
4102 | |
4103 int os::PlatformEvent::park(jlong millis) { | |
4104 guarantee (_nParked == 0, "invariant") ; | |
4105 | |
4106 int v ; | |
4107 for (;;) { | |
4108 v = _Event ; | |
4109 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4110 } | |
4111 guarantee (v >= 0, "invariant") ; | |
4112 if (v != 0) return OS_OK ; | |
4113 | |
4114 // We do this the hard way, by blocking the thread. | |
4115 // Consider enforcing a minimum timeout value. | |
4116 struct timespec abst; | |
4117 compute_abstime(&abst, millis); | |
4118 | |
4119 int ret = OS_TIMEOUT; | |
4120 int status = pthread_mutex_lock(_mutex); | |
4121 assert_status(status == 0, status, "mutex_lock"); | |
4122 guarantee (_nParked == 0, "invariant") ; | |
4123 ++_nParked ; | |
4124 | |
4125 // Object.wait(timo) will return because of | |
4126 // (a) notification | |
4127 // (b) timeout | |
4128 // (c) thread.interrupt | |
4129 // | |
4130 // Thread.interrupt and object.notify{All} both call Event::set. | |
4131 // That is, we treat thread.interrupt as a special case of notification. | |
4132 // The underlying Solaris implementation, cond_timedwait, admits | |
4133 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4134 // JVM from making those visible to Java code. As such, we must | |
4135 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4136 // | |
4137 // TODO: properly differentiate simultaneous notify+interrupt. | |
4138 // In that case, we should propagate the notify to another waiter. | |
4139 | |
4140 while (_Event < 0) { | |
4141 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
4142 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4143 pthread_cond_destroy (_cond); | |
4144 pthread_cond_init (_cond, NULL) ; | |
4145 } | |
4146 assert_status(status == 0 || status == EINTR || | |
4147 status == ETIMEDOUT, | |
4148 status, "cond_timedwait"); | |
4149 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4150 if (status == ETIMEDOUT) break ; | |
4151 // We consume and ignore EINTR and spurious wakeups. | |
4152 } | |
4153 --_nParked ; | |
4154 if (_Event >= 0) { | |
4155 ret = OS_OK; | |
4156 } | |
4157 _Event = 0 ; | |
4158 status = pthread_mutex_unlock(_mutex); | |
4159 assert_status(status == 0, status, "mutex_unlock"); | |
4160 assert (_nParked == 0, "invariant") ; | |
4161 return ret; | |
4162 } | |
4163 | |
4164 void os::PlatformEvent::unpark() { | |
4165 int v, AnyWaiters ; | |
4166 for (;;) { | |
4167 v = _Event ; | |
4168 if (v > 0) { | |
4169 // The LD of _Event could have reordered or be satisfied | |
4170 // by a read-aside from this processor's write buffer. | |
4171 // To avoid problems execute a barrier and then | |
4172 // ratify the value. | |
4173 OrderAccess::fence() ; | |
4174 if (_Event == v) return ; | |
4175 continue ; | |
4176 } | |
4177 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; | |
4178 } | |
4179 if (v < 0) { | |
4180 // Wait for the thread associated with the event to vacate | |
4181 int status = pthread_mutex_lock(_mutex); | |
4182 assert_status(status == 0, status, "mutex_lock"); | |
4183 AnyWaiters = _nParked ; | |
4184 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; | |
4185 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { | |
4186 AnyWaiters = 0 ; | |
4187 pthread_cond_signal (_cond); | |
4188 } | |
4189 status = pthread_mutex_unlock(_mutex); | |
4190 assert_status(status == 0, status, "mutex_unlock"); | |
4191 if (AnyWaiters != 0) { | |
4192 status = pthread_cond_signal(_cond); | |
4193 assert_status(status == 0, status, "cond_signal"); | |
4194 } | |
4195 } | |
4196 | |
4197 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4198 // This is safe and avoids a common class of futile wakeups. In rare | |
4199 // circumstances this can cause a thread to return prematurely from | |
4200 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4201 // simply re-test the condition and re-park itself. | |
4202 } | |
4203 | |
4204 | |
4205 // JSR166 | |
4206 // ------------------------------------------------------- | |
4207 | |
4208 /* | |
4209 * The solaris and bsd implementations of park/unpark are fairly | |
4210 * conservative for now, but can be improved. They currently use a | |
4211 * mutex/condvar pair, plus a a count. | |
4212 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4213 * sets count to 1 and signals condvar. Only one thread ever waits | |
4214 * on the condvar. Contention seen when trying to park implies that someone | |
4215 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4216 * is no need to track notifications. | |
4217 */ | |
4218 | |
4219 #define MAX_SECS 100000000 | |
4220 /* | |
4221 * This code is common to bsd and solaris and will be moved to a | |
4222 * common place in dolphin. | |
4223 * | |
4224 * The passed in time value is either a relative time in nanoseconds | |
4225 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4226 * into suitable seconds and nanoseconds components and stored in the | |
4227 * given timespec structure. | |
4228 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4229 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
4230 * overflow if times way in the future are given. Further on Solaris versions | |
4231 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4232 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
4233 * As it will be 28 years before "now + 100000000" will overflow we can | |
4234 * ignore overflow and just impose a hard-limit on seconds using the value | |
4235 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4236 * years from "now". | |
4237 */ | |
4238 | |
4239 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
4240 assert (time > 0, "convertTime"); | |
4241 | |
4242 struct timeval now; | |
4243 int status = gettimeofday(&now, NULL); | |
4244 assert(status == 0, "gettimeofday"); | |
4245 | |
4246 time_t max_secs = now.tv_sec + MAX_SECS; | |
4247 | |
4248 if (isAbsolute) { | |
4249 jlong secs = time / 1000; | |
4250 if (secs > max_secs) { | |
4251 absTime->tv_sec = max_secs; | |
4252 } | |
4253 else { | |
4254 absTime->tv_sec = secs; | |
4255 } | |
4256 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4257 } | |
4258 else { | |
4259 jlong secs = time / NANOSECS_PER_SEC; | |
4260 if (secs >= MAX_SECS) { | |
4261 absTime->tv_sec = max_secs; | |
4262 absTime->tv_nsec = 0; | |
4263 } | |
4264 else { | |
4265 absTime->tv_sec = now.tv_sec + secs; | |
4266 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4267 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4268 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4269 ++absTime->tv_sec; // note: this must be <= max_secs | |
4270 } | |
4271 } | |
4272 } | |
4273 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4274 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4275 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4276 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4277 } | |
4278 | |
4279 void Parker::park(bool isAbsolute, jlong time) { | |
4280 // Optional fast-path check: | |
4281 // Return immediately if a permit is available. | |
4282 if (_counter > 0) { | |
4283 _counter = 0 ; | |
4284 OrderAccess::fence(); | |
4285 return ; | |
4286 } | |
4287 | |
4288 Thread* thread = Thread::current(); | |
4289 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4290 JavaThread *jt = (JavaThread *)thread; | |
4291 | |
4292 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4293 // Check interrupt before trying to wait | |
4294 if (Thread::is_interrupted(thread, false)) { | |
4295 return; | |
4296 } | |
4297 | |
4298 // Next, demultiplex/decode time arguments | |
4299 struct timespec absTime; | |
4300 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
4301 return; | |
4302 } | |
4303 if (time > 0) { | |
4304 unpackTime(&absTime, isAbsolute, time); | |
4305 } | |
4306 | |
4307 | |
4308 // Enter safepoint region | |
4309 // Beware of deadlocks such as 6317397. | |
4310 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4311 // In particular a thread must never block on the Threads_lock while | |
4312 // holding the Parker:: mutex. If safepoints are pending both the | |
4313 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4314 ThreadBlockInVM tbivm(jt); | |
4315 | |
4316 // Don't wait if cannot get lock since interference arises from | |
4317 // unblocking. Also. check interrupt before trying wait | |
4318 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4319 return; | |
4320 } | |
4321 | |
4322 int status ; | |
4323 if (_counter > 0) { // no wait needed | |
4324 _counter = 0; | |
4325 status = pthread_mutex_unlock(_mutex); | |
4326 assert (status == 0, "invariant") ; | |
4327 OrderAccess::fence(); | |
4328 return; | |
4329 } | |
4330 | |
4331 #ifdef ASSERT | |
4332 // Don't catch signals while blocked; let the running threads have the signals. | |
4333 // (This allows a debugger to break into the running thread.) | |
4334 sigset_t oldsigs; | |
4335 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
4336 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4337 #endif | |
4338 | |
4339 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
4340 jt->set_suspend_equivalent(); | |
4341 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
4342 | |
4343 if (time == 0) { | |
4344 status = pthread_cond_wait (_cond, _mutex) ; | |
4345 } else { | |
4346 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
4347 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4348 pthread_cond_destroy (_cond) ; | |
4349 pthread_cond_init (_cond, NULL); | |
4350 } | |
4351 } | |
4352 assert_status(status == 0 || status == EINTR || | |
4353 status == ETIMEDOUT, | |
4354 status, "cond_timedwait"); | |
4355 | |
4356 #ifdef ASSERT | |
4357 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
4358 #endif | |
4359 | |
4360 _counter = 0 ; | |
4361 status = pthread_mutex_unlock(_mutex) ; | |
4362 assert_status(status == 0, status, "invariant") ; | |
4363 // If externally suspended while waiting, re-suspend | |
4364 if (jt->handle_special_suspend_equivalent_condition()) { | |
4365 jt->java_suspend_self(); | |
4366 } | |
4367 | |
4368 OrderAccess::fence(); | |
4369 } | |
4370 | |
4371 void Parker::unpark() { | |
4372 int s, status ; | |
4373 status = pthread_mutex_lock(_mutex); | |
4374 assert (status == 0, "invariant") ; | |
4375 s = _counter; | |
4376 _counter = 1; | |
4377 if (s < 1) { | |
4378 if (WorkAroundNPTLTimedWaitHang) { | |
4379 status = pthread_cond_signal (_cond) ; | |
4380 assert (status == 0, "invariant") ; | |
4381 status = pthread_mutex_unlock(_mutex); | |
4382 assert (status == 0, "invariant") ; | |
4383 } else { | |
4384 status = pthread_mutex_unlock(_mutex); | |
4385 assert (status == 0, "invariant") ; | |
4386 status = pthread_cond_signal (_cond) ; | |
4387 assert (status == 0, "invariant") ; | |
4388 } | |
4389 } else { | |
4390 pthread_mutex_unlock(_mutex); | |
4391 assert (status == 0, "invariant") ; | |
4392 } | |
4393 } | |
4394 | |
4395 | |
4396 /* Darwin has no "environ" in a dynamic library. */ | |
4397 #ifdef __APPLE__ | |
4398 #include <crt_externs.h> | |
4399 #define environ (*_NSGetEnviron()) | |
4400 #else | |
4401 extern char** environ; | |
4402 #endif | |
4403 | |
4404 // Run the specified command in a separate process. Return its exit value, | |
4405 // or -1 on failure (e.g. can't fork a new process). | |
4406 // Unlike system(), this function can be called from signal handler. It | |
4407 // doesn't block SIGINT et al. | |
4408 int os::fork_and_exec(char* cmd) { | |
4409 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
4410 | |
4411 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
4412 // pthread_atfork handlers and reset pthread library. All we need is a | |
4413 // separate process to execve. Make a direct syscall to fork process. | |
4414 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
4415 // the best... | |
4416 pid_t pid = fork(); | |
4417 | |
4418 if (pid < 0) { | |
4419 // fork failed | |
4420 return -1; | |
4421 | |
4422 } else if (pid == 0) { | |
4423 // child process | |
4424 | |
4425 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
4426 // first to kill every thread on the thread list. Because this list is | |
4427 // not reset by fork() (see notes above), execve() will instead kill | |
4428 // every thread in the parent process. We know this is the only thread | |
4429 // in the new process, so make a system call directly. | |
4430 // IA64 should use normal execve() from glibc to match the glibc fork() | |
4431 // above. | |
4432 execve("/bin/sh", (char* const*)argv, environ); | |
4433 | |
4434 // execve failed | |
4435 _exit(-1); | |
4436 | |
4437 } else { | |
4438 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
4439 // care about the actual exit code, for now. | |
4440 | |
4441 int status; | |
4442 | |
4443 // Wait for the child process to exit. This returns immediately if | |
4444 // the child has already exited. */ | |
4445 while (waitpid(pid, &status, 0) < 0) { | |
4446 switch (errno) { | |
4447 case ECHILD: return 0; | |
4448 case EINTR: break; | |
4449 default: return -1; | |
4450 } | |
4451 } | |
4452 | |
4453 if (WIFEXITED(status)) { | |
4454 // The child exited normally; get its exit code. | |
4455 return WEXITSTATUS(status); | |
4456 } else if (WIFSIGNALED(status)) { | |
4457 // The child exited because of a signal | |
4458 // The best value to return is 0x80 + signal number, | |
4459 // because that is what all Unix shells do, and because | |
4460 // it allows callers to distinguish between process exit and | |
4461 // process death by signal. | |
4462 return 0x80 + WTERMSIG(status); | |
4463 } else { | |
4464 // Unknown exit code; pass it through | |
4465 return status; | |
4466 } | |
4467 } | |
4468 } | |
4469 | |
4470 // is_headless_jre() | |
4471 // | |
4082
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4472 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
3960 | 4473 // in order to report if we are running in a headless jre |
4474 // | |
4082
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4475 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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4476 // as libawt.so, and renamed libawt_xawt.so |
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4477 // |
3960 | 4478 bool os::is_headless_jre() { |
4479 struct stat statbuf; | |
4480 char buf[MAXPATHLEN]; | |
4481 char libmawtpath[MAXPATHLEN]; | |
4006 | 4482 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
5921 | 4483 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
3960 | 4484 char *p; |
4485 | |
4486 // Get path to libjvm.so | |
4487 os::jvm_path(buf, sizeof(buf)); | |
4488 | |
4489 // Get rid of libjvm.so | |
4490 p = strrchr(buf, '/'); | |
4491 if (p == NULL) return false; | |
4492 else *p = '\0'; | |
4493 | |
4494 // Get rid of client or server | |
4495 p = strrchr(buf, '/'); | |
4496 if (p == NULL) return false; | |
4497 else *p = '\0'; | |
4498 | |
4499 // check xawt/libmawt.so | |
4500 strcpy(libmawtpath, buf); | |
4501 strcat(libmawtpath, xawtstr); | |
4502 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
4503 | |
4082
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4504 // check libawt_xawt.so |
3960 | 4505 strcpy(libmawtpath, buf); |
4082
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4506 strcat(libmawtpath, new_xawtstr); |
3960 | 4507 if (::stat(libmawtpath, &statbuf) == 0) return false; |
4508 | |
4509 return true; | |
4510 } | |
6200
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4511 |
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4512 // Get the default path to the core file |
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4513 // Returns the length of the string |
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4514 int os::get_core_path(char* buffer, size_t bufferSize) { |
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4515 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
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4516 |
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4517 // Truncate if theoretical string was longer than bufferSize |
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4518 n = MIN2(n, (int)bufferSize); |
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4519 |
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4520 return n; |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4521 } |