Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 10208:9ce110b1d14a
Merge
author | kvn |
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date | Thu, 02 May 2013 18:50:05 -0700 |
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3960 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
3960 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 // no precompiled headers | |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "code/vtableStubs.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
3960 | 33 #include "interpreter/interpreter.hpp" |
34 #include "jvm_bsd.h" | |
35 #include "memory/allocation.inline.hpp" | |
36 #include "memory/filemap.hpp" | |
37 #include "mutex_bsd.inline.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "os_share_bsd.hpp" | |
40 #include "prims/jniFastGetField.hpp" | |
41 #include "prims/jvm.h" | |
42 #include "prims/jvm_misc.hpp" | |
43 #include "runtime/arguments.hpp" | |
44 #include "runtime/extendedPC.hpp" | |
45 #include "runtime/globals.hpp" | |
46 #include "runtime/interfaceSupport.hpp" | |
47 #include "runtime/java.hpp" | |
48 #include "runtime/javaCalls.hpp" | |
49 #include "runtime/mutexLocker.hpp" | |
50 #include "runtime/objectMonitor.hpp" | |
51 #include "runtime/osThread.hpp" | |
52 #include "runtime/perfMemory.hpp" | |
53 #include "runtime/sharedRuntime.hpp" | |
54 #include "runtime/statSampler.hpp" | |
55 #include "runtime/stubRoutines.hpp" | |
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56 #include "runtime/thread.inline.hpp" |
3960 | 57 #include "runtime/threadCritical.hpp" |
58 #include "runtime/timer.hpp" | |
59 #include "services/attachListener.hpp" | |
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60 #include "services/memTracker.hpp" |
3960 | 61 #include "services/runtimeService.hpp" |
62 #include "utilities/decoder.hpp" | |
63 #include "utilities/defaultStream.hpp" | |
64 #include "utilities/events.hpp" | |
65 #include "utilities/growableArray.hpp" | |
66 #include "utilities/vmError.hpp" | |
67 | |
68 // put OS-includes here | |
69 # include <sys/types.h> | |
70 # include <sys/mman.h> | |
71 # include <sys/stat.h> | |
72 # include <sys/select.h> | |
73 # include <pthread.h> | |
74 # include <signal.h> | |
75 # include <errno.h> | |
76 # include <dlfcn.h> | |
77 # include <stdio.h> | |
78 # include <unistd.h> | |
79 # include <sys/resource.h> | |
80 # include <pthread.h> | |
81 # include <sys/stat.h> | |
82 # include <sys/time.h> | |
83 # include <sys/times.h> | |
84 # include <sys/utsname.h> | |
85 # include <sys/socket.h> | |
86 # include <sys/wait.h> | |
87 # include <time.h> | |
88 # include <pwd.h> | |
89 # include <poll.h> | |
90 # include <semaphore.h> | |
91 # include <fcntl.h> | |
92 # include <string.h> | |
93 # include <sys/param.h> | |
94 # include <sys/sysctl.h> | |
95 # include <sys/ipc.h> | |
96 # include <sys/shm.h> | |
97 #ifndef __APPLE__ | |
98 # include <link.h> | |
99 #endif | |
100 # include <stdint.h> | |
101 # include <inttypes.h> | |
102 # include <sys/ioctl.h> | |
103 | |
104 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
105 # include <elf.h> | |
106 #endif | |
107 | |
108 #ifdef __APPLE__ | |
4006 | 109 # include <mach/mach.h> // semaphore_* API |
110 # include <mach-o/dyld.h> | |
111 # include <sys/proc_info.h> | |
112 # include <objc/objc-auto.h> | |
3960 | 113 #endif |
114 | |
115 #ifndef MAP_ANONYMOUS | |
116 #define MAP_ANONYMOUS MAP_ANON | |
117 #endif | |
118 | |
119 #define MAX_PATH (2 * K) | |
120 | |
121 // for timer info max values which include all bits | |
122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
123 | |
124 #define LARGEPAGES_BIT (1 << 6) | |
125 //////////////////////////////////////////////////////////////////////////////// | |
126 // global variables | |
127 julong os::Bsd::_physical_memory = 0; | |
128 | |
129 | |
130 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
131 pthread_t os::Bsd::_main_thread; | |
132 int os::Bsd::_page_size = -1; | |
133 | |
134 static jlong initial_time_count=0; | |
135 | |
136 static int clock_tics_per_sec = 100; | |
137 | |
138 // For diagnostics to print a message once. see run_periodic_checks | |
139 static sigset_t check_signal_done; | |
6918 | 140 static bool check_signals = true; |
3960 | 141 |
142 static pid_t _initial_pid = 0; | |
143 | |
144 /* Signal number used to suspend/resume a thread */ | |
145 | |
146 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
147 static int SR_signum = SIGUSR2; | |
148 sigset_t SR_sigset; | |
149 | |
150 | |
151 //////////////////////////////////////////////////////////////////////////////// | |
152 // utility functions | |
153 | |
154 static int SR_initialize(); | |
155 | |
156 julong os::available_memory() { | |
157 return Bsd::available_memory(); | |
158 } | |
159 | |
160 julong os::Bsd::available_memory() { | |
161 // XXXBSD: this is just a stopgap implementation | |
162 return physical_memory() >> 2; | |
163 } | |
164 | |
165 julong os::physical_memory() { | |
166 return Bsd::physical_memory(); | |
167 } | |
168 | |
169 //////////////////////////////////////////////////////////////////////////////// | |
170 // environment support | |
171 | |
172 bool os::getenv(const char* name, char* buf, int len) { | |
173 const char* val = ::getenv(name); | |
174 if (val != NULL && strlen(val) < (size_t)len) { | |
175 strcpy(buf, val); | |
176 return true; | |
177 } | |
178 if (len > 0) buf[0] = 0; // return a null string | |
179 return false; | |
180 } | |
181 | |
182 | |
183 // Return true if user is running as root. | |
184 | |
185 bool os::have_special_privileges() { | |
186 static bool init = false; | |
187 static bool privileges = false; | |
188 if (!init) { | |
189 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
190 init = true; | |
191 } | |
192 return privileges; | |
193 } | |
194 | |
195 | |
196 | |
197 // Cpu architecture string | |
198 #if defined(ZERO) | |
199 static char cpu_arch[] = ZERO_LIBARCH; | |
200 #elif defined(IA64) | |
201 static char cpu_arch[] = "ia64"; | |
202 #elif defined(IA32) | |
203 static char cpu_arch[] = "i386"; | |
204 #elif defined(AMD64) | |
205 static char cpu_arch[] = "amd64"; | |
206 #elif defined(ARM) | |
207 static char cpu_arch[] = "arm"; | |
208 #elif defined(PPC) | |
209 static char cpu_arch[] = "ppc"; | |
210 #elif defined(SPARC) | |
211 # ifdef _LP64 | |
212 static char cpu_arch[] = "sparcv9"; | |
213 # else | |
214 static char cpu_arch[] = "sparc"; | |
215 # endif | |
216 #else | |
217 #error Add appropriate cpu_arch setting | |
218 #endif | |
219 | |
4846 | 220 // Compiler variant |
221 #ifdef COMPILER2 | |
222 #define COMPILER_VARIANT "server" | |
223 #else | |
224 #define COMPILER_VARIANT "client" | |
225 #endif | |
3960 | 226 |
6918 | 227 |
3960 | 228 void os::Bsd::initialize_system_info() { |
229 int mib[2]; | |
230 size_t len; | |
231 int cpu_val; | |
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232 julong mem_val; |
3960 | 233 |
234 /* get processors count via hw.ncpus sysctl */ | |
235 mib[0] = CTL_HW; | |
236 mib[1] = HW_NCPU; | |
237 len = sizeof(cpu_val); | |
238 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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239 assert(len == sizeof(cpu_val), "unexpected data size"); |
3960 | 240 set_processor_count(cpu_val); |
241 } | |
242 else { | |
243 set_processor_count(1); // fallback | |
244 } | |
245 | |
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246 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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247 * since it returns a 64 bit value) |
3960 | 248 */ |
249 mib[0] = CTL_HW; | |
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250 mib[1] = HW_MEMSIZE; |
3960 | 251 len = sizeof(mem_val); |
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252 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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253 assert(len == sizeof(mem_val), "unexpected data size"); |
3960 | 254 _physical_memory = mem_val; |
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255 } else { |
3960 | 256 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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257 } |
3960 | 258 |
259 #ifdef __OpenBSD__ | |
260 { | |
261 // limit _physical_memory memory view on OpenBSD since | |
262 // datasize rlimit restricts us anyway. | |
263 struct rlimit limits; | |
264 getrlimit(RLIMIT_DATA, &limits); | |
265 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
266 } | |
267 #endif | |
268 } | |
269 | |
4006 | 270 #ifdef __APPLE__ |
271 static const char *get_home() { | |
272 const char *home_dir = ::getenv("HOME"); | |
273 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
274 struct passwd *passwd_info = getpwuid(geteuid()); | |
275 if (passwd_info != NULL) { | |
276 home_dir = passwd_info->pw_dir; | |
277 } | |
278 } | |
279 | |
280 return home_dir; | |
281 } | |
282 #endif | |
283 | |
3960 | 284 void os::init_system_properties_values() { |
285 // char arch[12]; | |
286 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
287 | |
288 // The next steps are taken in the product version: | |
289 // | |
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290 // Obtain the JAVA_HOME value from the location of libjvm.so. |
3960 | 291 // This library should be located at: |
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292 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
3960 | 293 // |
294 // If "/jre/lib/" appears at the right place in the path, then we | |
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295 // assume libjvm.so is installed in a JDK and we use this path. |
3960 | 296 // |
297 // Otherwise exit with message: "Could not create the Java virtual machine." | |
298 // | |
299 // The following extra steps are taken in the debugging version: | |
300 // | |
301 // If "/jre/lib/" does NOT appear at the right place in the path | |
302 // instead of exit check for $JAVA_HOME environment variable. | |
303 // | |
304 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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305 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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306 // it looks like libjvm.so is installed there |
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307 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
3960 | 308 // |
309 // Otherwise exit. | |
310 // | |
311 // Important note: if the location of libjvm.so changes this | |
312 // code needs to be changed accordingly. | |
313 | |
314 // The next few definitions allow the code to be verbatim: | |
6197 | 315 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
3960 | 316 #define getenv(n) ::getenv(n) |
317 | |
318 /* | |
319 * See ld(1): | |
320 * The linker uses the following search paths to locate required | |
321 * shared libraries: | |
322 * 1: ... | |
323 * ... | |
324 * 7: The default directories, normally /lib and /usr/lib. | |
325 */ | |
326 #ifndef DEFAULT_LIBPATH | |
327 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
328 #endif | |
329 | |
330 #define EXTENSIONS_DIR "/lib/ext" | |
331 #define ENDORSED_DIR "/lib/endorsed" | |
332 #define REG_DIR "/usr/java/packages" | |
333 | |
4006 | 334 #ifdef __APPLE__ |
335 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
336 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
337 const char *user_home_dir = get_home(); | |
338 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
339 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
340 sizeof(SYS_EXTENSIONS_DIRS); | |
341 #endif | |
342 | |
3960 | 343 { |
344 /* sysclasspath, java_home, dll_dir */ | |
345 { | |
346 char *home_path; | |
347 char *dll_path; | |
348 char *pslash; | |
349 char buf[MAXPATHLEN]; | |
350 os::jvm_path(buf, sizeof(buf)); | |
351 | |
352 // Found the full path to libjvm.so. | |
353 // Now cut the path to <java_home>/jre if we can. | |
354 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
355 pslash = strrchr(buf, '/'); | |
356 if (pslash != NULL) | |
357 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
358 dll_path = malloc(strlen(buf) + 1); | |
359 if (dll_path == NULL) | |
360 return; | |
361 strcpy(dll_path, buf); | |
362 Arguments::set_dll_dir(dll_path); | |
363 | |
364 if (pslash != NULL) { | |
365 pslash = strrchr(buf, '/'); | |
366 if (pslash != NULL) { | |
4006 | 367 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
368 #ifndef __APPLE__ | |
3960 | 369 pslash = strrchr(buf, '/'); |
370 if (pslash != NULL) | |
371 *pslash = '\0'; /* get rid of /lib */ | |
4006 | 372 #endif |
3960 | 373 } |
374 } | |
375 | |
376 home_path = malloc(strlen(buf) + 1); | |
377 if (home_path == NULL) | |
378 return; | |
379 strcpy(home_path, buf); | |
380 Arguments::set_java_home(home_path); | |
381 | |
382 if (!set_boot_path('/', ':')) | |
383 return; | |
384 } | |
385 | |
386 /* | |
387 * Where to look for native libraries | |
388 * | |
389 * Note: Due to a legacy implementation, most of the library path | |
390 * is set in the launcher. This was to accomodate linking restrictions | |
391 * on legacy Bsd implementations (which are no longer supported). | |
392 * Eventually, all the library path setting will be done here. | |
393 * | |
394 * However, to prevent the proliferation of improperly built native | |
395 * libraries, the new path component /usr/java/packages is added here. | |
396 * Eventually, all the library path setting will be done here. | |
397 */ | |
398 { | |
399 char *ld_library_path; | |
400 | |
401 /* | |
402 * Construct the invariant part of ld_library_path. Note that the | |
403 * space for the colon and the trailing null are provided by the | |
404 * nulls included by the sizeof operator (so actually we allocate | |
405 * a byte more than necessary). | |
406 */ | |
4006 | 407 #ifdef __APPLE__ |
408 ld_library_path = (char *) malloc(system_ext_size); | |
409 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
410 #else | |
3960 | 411 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
412 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
413 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
4006 | 414 #endif |
3960 | 415 |
416 /* | |
417 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
418 * should always exist (until the legacy problem cited above is | |
419 * addressed). | |
420 */ | |
421 #ifdef __APPLE__ | |
4006 | 422 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
423 char *l = getenv("JAVA_LIBRARY_PATH"); | |
424 if (l != NULL) { | |
425 char *t = ld_library_path; | |
426 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
427 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
428 sprintf(ld_library_path, "%s:%s", l, t); | |
429 free(t); | |
430 } | |
431 | |
3960 | 432 char *v = getenv("DYLD_LIBRARY_PATH"); |
433 #else | |
434 char *v = getenv("LD_LIBRARY_PATH"); | |
435 #endif | |
436 if (v != NULL) { | |
437 char *t = ld_library_path; | |
438 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
439 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
440 sprintf(ld_library_path, "%s:%s", v, t); | |
4006 | 441 free(t); |
3960 | 442 } |
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443 |
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444 #ifdef __APPLE__ |
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445 // Apple's Java6 has "." at the beginning of java.library.path. |
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446 // OpenJDK on Windows has "." at the end of java.library.path. |
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447 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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448 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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449 // "." is appended to the end of java.library.path. Yes, this |
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450 // could cause a change in behavior, but Apple's Java6 behavior |
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451 // can be achieved by putting "." at the beginning of the |
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452 // JAVA_LIBRARY_PATH environment variable. |
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453 { |
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454 char *t = ld_library_path; |
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455 // that's +3 for appending ":." and the trailing '\0' |
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456 ld_library_path = (char *) malloc(strlen(t) + 3); |
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457 sprintf(ld_library_path, "%s:%s", t, "."); |
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458 free(t); |
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459 } |
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460 #endif |
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461 |
3960 | 462 Arguments::set_library_path(ld_library_path); |
463 } | |
464 | |
465 /* | |
466 * Extensions directories. | |
467 * | |
468 * Note that the space for the colon and the trailing null are provided | |
469 * by the nulls included by the sizeof operator (so actually one byte more | |
470 * than necessary is allocated). | |
471 */ | |
472 { | |
4006 | 473 #ifdef __APPLE__ |
474 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
475 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
476 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
477 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
478 #else | |
3960 | 479 char *buf = malloc(strlen(Arguments::get_java_home()) + |
480 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
481 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
482 Arguments::get_java_home()); | |
4006 | 483 #endif |
484 | |
3960 | 485 Arguments::set_ext_dirs(buf); |
486 } | |
487 | |
488 /* Endorsed standards default directory. */ | |
489 { | |
490 char * buf; | |
491 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
492 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
493 Arguments::set_endorsed_dirs(buf); | |
494 } | |
495 } | |
496 | |
4006 | 497 #ifdef __APPLE__ |
498 #undef SYS_EXTENSIONS_DIR | |
499 #endif | |
3960 | 500 #undef malloc |
501 #undef getenv | |
502 #undef EXTENSIONS_DIR | |
503 #undef ENDORSED_DIR | |
504 | |
505 // Done | |
506 return; | |
507 } | |
508 | |
509 //////////////////////////////////////////////////////////////////////////////// | |
510 // breakpoint support | |
511 | |
512 void os::breakpoint() { | |
513 BREAKPOINT; | |
514 } | |
515 | |
516 extern "C" void breakpoint() { | |
517 // use debugger to set breakpoint here | |
518 } | |
519 | |
520 //////////////////////////////////////////////////////////////////////////////// | |
521 // signal support | |
522 | |
523 debug_only(static bool signal_sets_initialized = false); | |
524 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
525 | |
526 bool os::Bsd::is_sig_ignored(int sig) { | |
527 struct sigaction oact; | |
528 sigaction(sig, (struct sigaction*)NULL, &oact); | |
529 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
530 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
531 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
532 return true; | |
533 else | |
534 return false; | |
535 } | |
536 | |
537 void os::Bsd::signal_sets_init() { | |
538 // Should also have an assertion stating we are still single-threaded. | |
539 assert(!signal_sets_initialized, "Already initialized"); | |
540 // Fill in signals that are necessarily unblocked for all threads in | |
541 // the VM. Currently, we unblock the following signals: | |
542 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
543 // by -Xrs (=ReduceSignalUsage)); | |
544 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
545 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
546 // the dispositions or masks wrt these signals. | |
547 // Programs embedding the VM that want to use the above signals for their | |
548 // own purposes must, at this time, use the "-Xrs" option to prevent | |
549 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
550 // (See bug 4345157, and other related bugs). | |
551 // In reality, though, unblocking these signals is really a nop, since | |
552 // these signals are not blocked by default. | |
553 sigemptyset(&unblocked_sigs); | |
554 sigemptyset(&allowdebug_blocked_sigs); | |
555 sigaddset(&unblocked_sigs, SIGILL); | |
556 sigaddset(&unblocked_sigs, SIGSEGV); | |
557 sigaddset(&unblocked_sigs, SIGBUS); | |
558 sigaddset(&unblocked_sigs, SIGFPE); | |
559 sigaddset(&unblocked_sigs, SR_signum); | |
560 | |
561 if (!ReduceSignalUsage) { | |
562 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
563 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
564 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
565 } | |
566 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
567 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
568 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
569 } | |
570 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
571 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
572 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
573 } | |
574 } | |
575 // Fill in signals that are blocked by all but the VM thread. | |
576 sigemptyset(&vm_sigs); | |
577 if (!ReduceSignalUsage) | |
578 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
579 debug_only(signal_sets_initialized = true); | |
580 | |
581 } | |
582 | |
583 // These are signals that are unblocked while a thread is running Java. | |
584 // (For some reason, they get blocked by default.) | |
585 sigset_t* os::Bsd::unblocked_signals() { | |
586 assert(signal_sets_initialized, "Not initialized"); | |
587 return &unblocked_sigs; | |
588 } | |
589 | |
590 // These are the signals that are blocked while a (non-VM) thread is | |
591 // running Java. Only the VM thread handles these signals. | |
592 sigset_t* os::Bsd::vm_signals() { | |
593 assert(signal_sets_initialized, "Not initialized"); | |
594 return &vm_sigs; | |
595 } | |
596 | |
597 // These are signals that are blocked during cond_wait to allow debugger in | |
598 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
599 assert(signal_sets_initialized, "Not initialized"); | |
600 return &allowdebug_blocked_sigs; | |
601 } | |
602 | |
603 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
604 | |
605 //Save caller's signal mask before setting VM signal mask | |
606 sigset_t caller_sigmask; | |
607 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
608 | |
609 OSThread* osthread = thread->osthread(); | |
610 osthread->set_caller_sigmask(caller_sigmask); | |
611 | |
612 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
613 | |
614 if (!ReduceSignalUsage) { | |
615 if (thread->is_VM_thread()) { | |
616 // Only the VM thread handles BREAK_SIGNAL ... | |
617 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
618 } else { | |
619 // ... all other threads block BREAK_SIGNAL | |
620 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
621 } | |
622 } | |
623 } | |
624 | |
625 | |
626 ////////////////////////////////////////////////////////////////////////////// | |
627 // create new thread | |
628 | |
629 static address highest_vm_reserved_address(); | |
630 | |
631 // check if it's safe to start a new thread | |
632 static bool _thread_safety_check(Thread* thread) { | |
6918 | 633 return true; |
3960 | 634 } |
635 | |
4006 | 636 #ifdef __APPLE__ |
637 // library handle for calling objc_registerThreadWithCollector() | |
638 // without static linking to the libobjc library | |
639 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
640 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
641 typedef void (*objc_registerThreadWithCollector_t)(); | |
642 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
643 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
644 #endif | |
645 | |
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646 #ifdef __APPLE__ |
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647 static uint64_t locate_unique_thread_id() { |
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648 // Additional thread_id used to correlate threads in SA |
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649 thread_identifier_info_data_t m_ident_info; |
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650 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
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651 |
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652 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, |
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653 (thread_info_t) &m_ident_info, &count); |
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654 return m_ident_info.thread_id; |
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655 } |
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656 #endif |
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657 |
3960 | 658 // Thread start routine for all newly created threads |
659 static void *java_start(Thread *thread) { | |
660 // Try to randomize the cache line index of hot stack frames. | |
661 // This helps when threads of the same stack traces evict each other's | |
662 // cache lines. The threads can be either from the same JVM instance, or | |
663 // from different JVM instances. The benefit is especially true for | |
664 // processors with hyperthreading technology. | |
665 static int counter = 0; | |
666 int pid = os::current_process_id(); | |
667 alloca(((pid ^ counter++) & 7) * 128); | |
668 | |
669 ThreadLocalStorage::set_thread(thread); | |
670 | |
671 OSThread* osthread = thread->osthread(); | |
672 Monitor* sync = osthread->startThread_lock(); | |
673 | |
674 // non floating stack BsdThreads needs extra check, see above | |
675 if (!_thread_safety_check(thread)) { | |
676 // notify parent thread | |
677 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
678 osthread->set_state(ZOMBIE); | |
679 sync->notify_all(); | |
680 return NULL; | |
681 } | |
682 | |
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683 #ifdef __APPLE__ |
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684 // thread_id is mach thread on macos |
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685 osthread->set_thread_id(::mach_thread_self()); |
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686 osthread->set_unique_thread_id(locate_unique_thread_id()); |
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687 #else |
3960 | 688 // thread_id is pthread_id on BSD |
689 osthread->set_thread_id(::pthread_self()); | |
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690 #endif |
3960 | 691 // initialize signal mask for this thread |
692 os::Bsd::hotspot_sigmask(thread); | |
693 | |
694 // initialize floating point control register | |
695 os::Bsd::init_thread_fpu_state(); | |
696 | |
4006 | 697 #ifdef __APPLE__ |
698 // register thread with objc gc | |
699 if (objc_registerThreadWithCollectorFunction != NULL) { | |
700 objc_registerThreadWithCollectorFunction(); | |
701 } | |
702 #endif | |
703 | |
3960 | 704 // handshaking with parent thread |
705 { | |
706 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
707 | |
708 // notify parent thread | |
709 osthread->set_state(INITIALIZED); | |
710 sync->notify_all(); | |
711 | |
712 // wait until os::start_thread() | |
713 while (osthread->get_state() == INITIALIZED) { | |
714 sync->wait(Mutex::_no_safepoint_check_flag); | |
715 } | |
716 } | |
717 | |
718 // call one more level start routine | |
719 thread->run(); | |
720 | |
721 return 0; | |
722 } | |
723 | |
724 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
725 assert(thread->osthread() == NULL, "caller responsible"); | |
726 | |
727 // Allocate the OSThread object | |
728 OSThread* osthread = new OSThread(NULL, NULL); | |
729 if (osthread == NULL) { | |
730 return false; | |
731 } | |
732 | |
733 // set the correct thread state | |
734 osthread->set_thread_type(thr_type); | |
735 | |
736 // Initial state is ALLOCATED but not INITIALIZED | |
737 osthread->set_state(ALLOCATED); | |
738 | |
739 thread->set_osthread(osthread); | |
740 | |
741 // init thread attributes | |
742 pthread_attr_t attr; | |
743 pthread_attr_init(&attr); | |
744 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
745 | |
746 // stack size | |
747 if (os::Bsd::supports_variable_stack_size()) { | |
748 // calculate stack size if it's not specified by caller | |
749 if (stack_size == 0) { | |
750 stack_size = os::Bsd::default_stack_size(thr_type); | |
751 | |
752 switch (thr_type) { | |
753 case os::java_thread: | |
754 // Java threads use ThreadStackSize which default value can be | |
755 // changed with the flag -Xss | |
756 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
757 stack_size = JavaThread::stack_size_at_create(); | |
758 break; | |
759 case os::compiler_thread: | |
760 if (CompilerThreadStackSize > 0) { | |
761 stack_size = (size_t)(CompilerThreadStackSize * K); | |
762 break; | |
763 } // else fall through: | |
764 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
765 case os::vm_thread: | |
766 case os::pgc_thread: | |
767 case os::cgc_thread: | |
768 case os::watcher_thread: | |
769 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
770 break; | |
771 } | |
772 } | |
773 | |
774 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
775 pthread_attr_setstacksize(&attr, stack_size); | |
776 } else { | |
777 // let pthread_create() pick the default value. | |
778 } | |
779 | |
780 ThreadState state; | |
781 | |
782 { | |
783 pthread_t tid; | |
784 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
785 | |
786 pthread_attr_destroy(&attr); | |
787 | |
788 if (ret != 0) { | |
789 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
790 perror("pthread_create()"); | |
791 } | |
792 // Need to clean up stuff we've allocated so far | |
793 thread->set_osthread(NULL); | |
794 delete osthread; | |
795 return false; | |
796 } | |
797 | |
798 // Store pthread info into the OSThread | |
799 osthread->set_pthread_id(tid); | |
800 | |
801 // Wait until child thread is either initialized or aborted | |
802 { | |
803 Monitor* sync_with_child = osthread->startThread_lock(); | |
804 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
805 while ((state = osthread->get_state()) == ALLOCATED) { | |
806 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
807 } | |
808 } | |
809 | |
810 } | |
811 | |
812 // Aborted due to thread limit being reached | |
813 if (state == ZOMBIE) { | |
814 thread->set_osthread(NULL); | |
815 delete osthread; | |
816 return false; | |
817 } | |
818 | |
819 // The thread is returned suspended (in state INITIALIZED), | |
820 // and is started higher up in the call chain | |
821 assert(state == INITIALIZED, "race condition"); | |
822 return true; | |
823 } | |
824 | |
825 ///////////////////////////////////////////////////////////////////////////// | |
826 // attach existing thread | |
827 | |
828 // bootstrap the main thread | |
829 bool os::create_main_thread(JavaThread* thread) { | |
830 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
831 return create_attached_thread(thread); | |
832 } | |
833 | |
834 bool os::create_attached_thread(JavaThread* thread) { | |
835 #ifdef ASSERT | |
836 thread->verify_not_published(); | |
837 #endif | |
838 | |
839 // Allocate the OSThread object | |
840 OSThread* osthread = new OSThread(NULL, NULL); | |
841 | |
842 if (osthread == NULL) { | |
843 return false; | |
844 } | |
845 | |
846 // Store pthread info into the OSThread | |
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847 #ifdef __APPLE__ |
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848 osthread->set_thread_id(::mach_thread_self()); |
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849 osthread->set_unique_thread_id(locate_unique_thread_id()); |
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850 #else |
3960 | 851 osthread->set_thread_id(::pthread_self()); |
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852 #endif |
3960 | 853 osthread->set_pthread_id(::pthread_self()); |
854 | |
855 // initialize floating point control register | |
856 os::Bsd::init_thread_fpu_state(); | |
857 | |
858 // Initial thread state is RUNNABLE | |
859 osthread->set_state(RUNNABLE); | |
860 | |
861 thread->set_osthread(osthread); | |
862 | |
863 // initialize signal mask for this thread | |
864 // and save the caller's signal mask | |
865 os::Bsd::hotspot_sigmask(thread); | |
866 | |
867 return true; | |
868 } | |
869 | |
870 void os::pd_start_thread(Thread* thread) { | |
871 OSThread * osthread = thread->osthread(); | |
872 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
873 Monitor* sync_with_child = osthread->startThread_lock(); | |
874 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
875 sync_with_child->notify(); | |
876 } | |
877 | |
878 // Free Bsd resources related to the OSThread | |
879 void os::free_thread(OSThread* osthread) { | |
880 assert(osthread != NULL, "osthread not set"); | |
881 | |
882 if (Thread::current()->osthread() == osthread) { | |
883 // Restore caller's signal mask | |
884 sigset_t sigmask = osthread->caller_sigmask(); | |
885 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
886 } | |
887 | |
888 delete osthread; | |
889 } | |
890 | |
891 ////////////////////////////////////////////////////////////////////////////// | |
892 // thread local storage | |
893 | |
894 int os::allocate_thread_local_storage() { | |
895 pthread_key_t key; | |
896 int rslt = pthread_key_create(&key, NULL); | |
897 assert(rslt == 0, "cannot allocate thread local storage"); | |
898 return (int)key; | |
899 } | |
900 | |
901 // Note: This is currently not used by VM, as we don't destroy TLS key | |
902 // on VM exit. | |
903 void os::free_thread_local_storage(int index) { | |
904 int rslt = pthread_key_delete((pthread_key_t)index); | |
905 assert(rslt == 0, "invalid index"); | |
906 } | |
907 | |
908 void os::thread_local_storage_at_put(int index, void* value) { | |
909 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
910 assert(rslt == 0, "pthread_setspecific failed"); | |
911 } | |
912 | |
913 extern "C" Thread* get_thread() { | |
914 return ThreadLocalStorage::thread(); | |
915 } | |
916 | |
917 | |
918 //////////////////////////////////////////////////////////////////////////////// | |
919 // time support | |
920 | |
921 // Time since start-up in seconds to a fine granularity. | |
922 // Used by VMSelfDestructTimer and the MemProfiler. | |
923 double os::elapsedTime() { | |
924 | |
925 return (double)(os::elapsed_counter()) * 0.000001; | |
926 } | |
927 | |
928 jlong os::elapsed_counter() { | |
929 timeval time; | |
930 int status = gettimeofday(&time, NULL); | |
931 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
932 } | |
933 | |
934 jlong os::elapsed_frequency() { | |
935 return (1000 * 1000); | |
936 } | |
937 | |
938 // XXX: For now, code this as if BSD does not support vtime. | |
939 bool os::supports_vtime() { return false; } | |
940 bool os::enable_vtime() { return false; } | |
941 bool os::vtime_enabled() { return false; } | |
942 double os::elapsedVTime() { | |
943 // better than nothing, but not much | |
944 return elapsedTime(); | |
945 } | |
946 | |
947 jlong os::javaTimeMillis() { | |
948 timeval time; | |
949 int status = gettimeofday(&time, NULL); | |
950 assert(status != -1, "bsd error"); | |
951 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
952 } | |
953 | |
954 #ifndef CLOCK_MONOTONIC | |
955 #define CLOCK_MONOTONIC (1) | |
956 #endif | |
957 | |
958 #ifdef __APPLE__ | |
959 void os::Bsd::clock_init() { | |
960 // XXXDARWIN: Investigate replacement monotonic clock | |
961 } | |
6918 | 962 #else |
3960 | 963 void os::Bsd::clock_init() { |
964 struct timespec res; | |
965 struct timespec tp; | |
966 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
967 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
968 // yes, monotonic clock is supported | |
969 _clock_gettime = ::clock_gettime; | |
970 } | |
971 } | |
972 #endif | |
973 | |
974 | |
975 jlong os::javaTimeNanos() { | |
976 if (Bsd::supports_monotonic_clock()) { | |
977 struct timespec tp; | |
978 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
979 assert(status == 0, "gettime error"); | |
980 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
981 return result; | |
982 } else { | |
983 timeval time; | |
984 int status = gettimeofday(&time, NULL); | |
985 assert(status != -1, "bsd error"); | |
986 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
987 return 1000 * usecs; | |
988 } | |
989 } | |
990 | |
991 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
992 if (Bsd::supports_monotonic_clock()) { | |
993 info_ptr->max_value = ALL_64_BITS; | |
994 | |
995 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
996 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
997 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
998 } else { | |
999 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1000 info_ptr->max_value = ALL_64_BITS; | |
1001 | |
1002 // gettimeofday is a real time clock so it skips | |
1003 info_ptr->may_skip_backward = true; | |
1004 info_ptr->may_skip_forward = true; | |
1005 } | |
1006 | |
1007 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1008 } | |
1009 | |
1010 // Return the real, user, and system times in seconds from an | |
1011 // arbitrary fixed point in the past. | |
1012 bool os::getTimesSecs(double* process_real_time, | |
1013 double* process_user_time, | |
1014 double* process_system_time) { | |
1015 struct tms ticks; | |
1016 clock_t real_ticks = times(&ticks); | |
1017 | |
1018 if (real_ticks == (clock_t) (-1)) { | |
1019 return false; | |
1020 } else { | |
1021 double ticks_per_second = (double) clock_tics_per_sec; | |
1022 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1023 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1024 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1025 | |
1026 return true; | |
1027 } | |
1028 } | |
1029 | |
1030 | |
1031 char * os::local_time_string(char *buf, size_t buflen) { | |
1032 struct tm t; | |
1033 time_t long_time; | |
1034 time(&long_time); | |
1035 localtime_r(&long_time, &t); | |
1036 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1037 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1038 t.tm_hour, t.tm_min, t.tm_sec); | |
1039 return buf; | |
1040 } | |
1041 | |
1042 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1043 return localtime_r(clock, res); | |
1044 } | |
1045 | |
1046 //////////////////////////////////////////////////////////////////////////////// | |
1047 // runtime exit support | |
1048 | |
1049 // Note: os::shutdown() might be called very early during initialization, or | |
1050 // called from signal handler. Before adding something to os::shutdown(), make | |
1051 // sure it is async-safe and can handle partially initialized VM. | |
1052 void os::shutdown() { | |
1053 | |
1054 // allow PerfMemory to attempt cleanup of any persistent resources | |
1055 perfMemory_exit(); | |
1056 | |
1057 // needs to remove object in file system | |
1058 AttachListener::abort(); | |
1059 | |
1060 // flush buffered output, finish log files | |
1061 ostream_abort(); | |
1062 | |
1063 // Check for abort hook | |
1064 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1065 if (abort_hook != NULL) { | |
1066 abort_hook(); | |
1067 } | |
1068 | |
1069 } | |
1070 | |
1071 // Note: os::abort() might be called very early during initialization, or | |
1072 // called from signal handler. Before adding something to os::abort(), make | |
1073 // sure it is async-safe and can handle partially initialized VM. | |
1074 void os::abort(bool dump_core) { | |
1075 os::shutdown(); | |
1076 if (dump_core) { | |
1077 #ifndef PRODUCT | |
1078 fdStream out(defaultStream::output_fd()); | |
1079 out.print_raw("Current thread is "); | |
1080 char buf[16]; | |
1081 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1082 out.print_raw_cr(buf); | |
1083 out.print_raw_cr("Dumping core ..."); | |
1084 #endif | |
1085 ::abort(); // dump core | |
1086 } | |
1087 | |
1088 ::exit(1); | |
1089 } | |
1090 | |
1091 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1092 void os::die() { | |
1093 // _exit() on BsdThreads only kills current thread | |
1094 ::abort(); | |
1095 } | |
1096 | |
1097 // unused on bsd for now. | |
1098 void os::set_error_file(const char *logfile) {} | |
1099 | |
1100 | |
1101 // This method is a copy of JDK's sysGetLastErrorString | |
1102 // from src/solaris/hpi/src/system_md.c | |
1103 | |
1104 size_t os::lasterror(char *buf, size_t len) { | |
1105 | |
1106 if (errno == 0) return 0; | |
1107 | |
1108 const char *s = ::strerror(errno); | |
1109 size_t n = ::strlen(s); | |
1110 if (n >= len) { | |
1111 n = len - 1; | |
1112 } | |
1113 ::strncpy(buf, s, n); | |
1114 buf[n] = '\0'; | |
1115 return n; | |
1116 } | |
1117 | |
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1118 intx os::current_thread_id() { |
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1119 #ifdef __APPLE__ |
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1120 return (intx)::mach_thread_self(); |
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1121 #else |
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1122 return (intx)::pthread_self(); |
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1123 #endif |
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1124 } |
3960 | 1125 int os::current_process_id() { |
1126 | |
1127 // Under the old bsd thread library, bsd gives each thread | |
1128 // its own process id. Because of this each thread will return | |
1129 // a different pid if this method were to return the result | |
1130 // of getpid(2). Bsd provides no api that returns the pid | |
1131 // of the launcher thread for the vm. This implementation | |
1132 // returns a unique pid, the pid of the launcher thread | |
1133 // that starts the vm 'process'. | |
1134 | |
1135 // Under the NPTL, getpid() returns the same pid as the | |
1136 // launcher thread rather than a unique pid per thread. | |
1137 // Use gettid() if you want the old pre NPTL behaviour. | |
1138 | |
1139 // if you are looking for the result of a call to getpid() that | |
1140 // returns a unique pid for the calling thread, then look at the | |
1141 // OSThread::thread_id() method in osThread_bsd.hpp file | |
1142 | |
1143 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1144 } | |
1145 | |
1146 // DLL functions | |
1147 | |
1148 #define JNI_LIB_PREFIX "lib" | |
1149 #ifdef __APPLE__ | |
1150 #define JNI_LIB_SUFFIX ".dylib" | |
1151 #else | |
1152 #define JNI_LIB_SUFFIX ".so" | |
1153 #endif | |
1154 | |
1155 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
1156 | |
1157 // This must be hard coded because it's the system's temporary | |
1158 // directory not the java application's temp directory, ala java.io.tmpdir. | |
4006 | 1159 #ifdef __APPLE__ |
1160 // macosx has a secure per-user temporary directory | |
1161 char temp_path_storage[PATH_MAX]; | |
1162 const char* os::get_temp_directory() { | |
1163 static char *temp_path = NULL; | |
1164 if (temp_path == NULL) { | |
1165 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
1166 if (pathSize == 0 || pathSize > PATH_MAX) { | |
1167 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
1168 } | |
1169 temp_path = temp_path_storage; | |
1170 } | |
1171 return temp_path; | |
1172 } | |
1173 #else /* __APPLE__ */ | |
3960 | 1174 const char* os::get_temp_directory() { return "/tmp"; } |
4006 | 1175 #endif /* __APPLE__ */ |
3960 | 1176 |
1177 static bool file_exists(const char* filename) { | |
1178 struct stat statbuf; | |
1179 if (filename == NULL || strlen(filename) == 0) { | |
1180 return false; | |
1181 } | |
1182 return os::stat(filename, &statbuf) == 0; | |
1183 } | |
1184 | |
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1185 bool os::dll_build_name(char* buffer, size_t buflen, |
3960 | 1186 const char* pname, const char* fname) { |
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1187 bool retval = false; |
3960 | 1188 // Copied from libhpi |
1189 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1190 | |
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1191 // Return error on buffer overflow. |
3960 | 1192 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1193 return retval; |
3960 | 1194 } |
1195 | |
1196 if (pnamelen == 0) { | |
1197 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1198 retval = true; |
3960 | 1199 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1200 int n; | |
1201 char** pelements = split_path(pname, &n); | |
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1202 if (pelements == NULL) { |
9062 | 1203 return false; |
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1204 } |
3960 | 1205 for (int i = 0 ; i < n ; i++) { |
1206 // Really shouldn't be NULL, but check can't hurt | |
1207 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1208 continue; // skip the empty path values | |
1209 } | |
1210 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
1211 pelements[i], fname); | |
1212 if (file_exists(buffer)) { | |
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1213 retval = true; |
3960 | 1214 break; |
1215 } | |
1216 } | |
1217 // release the storage | |
1218 for (int i = 0 ; i < n ; i++) { | |
1219 if (pelements[i] != NULL) { | |
6197 | 1220 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
3960 | 1221 } |
1222 } | |
1223 if (pelements != NULL) { | |
6197 | 1224 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
3960 | 1225 } |
1226 } else { | |
1227 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1228 retval = true; |
3960 | 1229 } |
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1230 return retval; |
3960 | 1231 } |
1232 | |
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1233 // check if addr is inside libjvm.so |
3960 | 1234 bool os::address_is_in_vm(address addr) { |
1235 static address libjvm_base_addr; | |
1236 Dl_info dlinfo; | |
1237 | |
1238 if (libjvm_base_addr == NULL) { | |
1239 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
1240 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
1241 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
1242 } | |
1243 | |
1244 if (dladdr((void *)addr, &dlinfo)) { | |
1245 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
1246 } | |
1247 | |
1248 return false; | |
1249 } | |
1250 | |
6258 | 1251 |
1252 #define MACH_MAXSYMLEN 256 | |
1253 | |
3960 | 1254 bool os::dll_address_to_function_name(address addr, char *buf, |
1255 int buflen, int *offset) { | |
1256 Dl_info dlinfo; | |
6258 | 1257 char localbuf[MACH_MAXSYMLEN]; |
1258 | |
1259 // dladdr will find names of dynamic functions only, but does | |
1260 // it set dli_fbase with mach_header address when it "fails" ? | |
3960 | 1261 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
1262 if (buf != NULL) { | |
1263 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
1264 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
1265 } | |
1266 } | |
1267 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
1268 return true; | |
1269 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
1270 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
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1271 buf, buflen, offset, dlinfo.dli_fname)) { |
3960 | 1272 return true; |
1273 } | |
1274 } | |
1275 | |
6258 | 1276 // Handle non-dymanic manually: |
1277 if (dlinfo.dli_fbase != NULL && | |
1278 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
1279 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
1280 jio_snprintf(buf, buflen, "%s", localbuf); | |
1281 } | |
1282 return true; | |
1283 } | |
3960 | 1284 if (buf != NULL) buf[0] = '\0'; |
1285 if (offset != NULL) *offset = -1; | |
1286 return false; | |
1287 } | |
1288 | |
1289 // ported from solaris version | |
1290 bool os::dll_address_to_library_name(address addr, char* buf, | |
1291 int buflen, int* offset) { | |
1292 Dl_info dlinfo; | |
1293 | |
1294 if (dladdr((void*)addr, &dlinfo)){ | |
1295 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
1296 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
1297 return true; | |
1298 } else { | |
1299 if (buf) buf[0] = '\0'; | |
1300 if (offset) *offset = -1; | |
1301 return false; | |
1302 } | |
1303 } | |
6918 | 1304 |
1305 // Loads .dll/.so and | |
1306 // in case of error it checks if .dll/.so was built for the | |
1307 // same architecture as Hotspot is running on | |
3960 | 1308 |
1309 #ifdef __APPLE__ | |
1310 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1311 void * result= ::dlopen(filename, RTLD_LAZY); | |
1312 if (result != NULL) { | |
1313 // Successful loading | |
1314 return result; | |
1315 } | |
1316 | |
1317 // Read system error message into ebuf | |
1318 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1319 ebuf[ebuflen-1]='\0'; | |
1320 | |
1321 return NULL; | |
1322 } | |
1323 #else | |
1324 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1325 { | |
1326 void * result= ::dlopen(filename, RTLD_LAZY); | |
1327 if (result != NULL) { | |
1328 // Successful loading | |
1329 return result; | |
1330 } | |
1331 | |
1332 Elf32_Ehdr elf_head; | |
1333 | |
1334 // Read system error message into ebuf | |
1335 // It may or may not be overwritten below | |
1336 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1337 ebuf[ebuflen-1]='\0'; | |
1338 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1339 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1340 | |
1341 if (diag_msg_max_length==0) { | |
1342 // No more space in ebuf for additional diagnostics message | |
1343 return NULL; | |
1344 } | |
1345 | |
1346 | |
1347 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1348 | |
1349 if (file_descriptor < 0) { | |
1350 // Can't open library, report dlerror() message | |
1351 return NULL; | |
1352 } | |
1353 | |
1354 bool failed_to_read_elf_head= | |
1355 (sizeof(elf_head)!= | |
1356 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1357 | |
1358 ::close(file_descriptor); | |
1359 if (failed_to_read_elf_head) { | |
1360 // file i/o error - report dlerror() msg | |
1361 return NULL; | |
1362 } | |
1363 | |
1364 typedef struct { | |
1365 Elf32_Half code; // Actual value as defined in elf.h | |
1366 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1367 char elf_class; // 32 or 64 bit | |
1368 char endianess; // MSB or LSB | |
1369 char* name; // String representation | |
1370 } arch_t; | |
1371 | |
1372 #ifndef EM_486 | |
1373 #define EM_486 6 /* Intel 80486 */ | |
1374 #endif | |
1375 | |
1376 #ifndef EM_MIPS_RS3_LE | |
1377 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
1378 #endif | |
1379 | |
1380 #ifndef EM_PPC64 | |
1381 #define EM_PPC64 21 /* PowerPC64 */ | |
1382 #endif | |
1383 | |
1384 #ifndef EM_S390 | |
1385 #define EM_S390 22 /* IBM System/390 */ | |
1386 #endif | |
1387 | |
1388 #ifndef EM_IA_64 | |
1389 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
1390 #endif | |
1391 | |
1392 #ifndef EM_X86_64 | |
1393 #define EM_X86_64 62 /* AMD x86-64 */ | |
1394 #endif | |
1395 | |
1396 static const arch_t arch_array[]={ | |
1397 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1398 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1399 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1400 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1401 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1402 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1403 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1404 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1405 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
1406 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1407 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1408 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1409 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1410 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1411 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1412 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
1413 }; | |
1414 | |
1415 #if (defined IA32) | |
1416 static Elf32_Half running_arch_code=EM_386; | |
1417 #elif (defined AMD64) | |
1418 static Elf32_Half running_arch_code=EM_X86_64; | |
1419 #elif (defined IA64) | |
1420 static Elf32_Half running_arch_code=EM_IA_64; | |
1421 #elif (defined __sparc) && (defined _LP64) | |
1422 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1423 #elif (defined __sparc) && (!defined _LP64) | |
1424 static Elf32_Half running_arch_code=EM_SPARC; | |
1425 #elif (defined __powerpc64__) | |
1426 static Elf32_Half running_arch_code=EM_PPC64; | |
1427 #elif (defined __powerpc__) | |
1428 static Elf32_Half running_arch_code=EM_PPC; | |
1429 #elif (defined ARM) | |
1430 static Elf32_Half running_arch_code=EM_ARM; | |
1431 #elif (defined S390) | |
1432 static Elf32_Half running_arch_code=EM_S390; | |
1433 #elif (defined ALPHA) | |
1434 static Elf32_Half running_arch_code=EM_ALPHA; | |
1435 #elif (defined MIPSEL) | |
1436 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1437 #elif (defined PARISC) | |
1438 static Elf32_Half running_arch_code=EM_PARISC; | |
1439 #elif (defined MIPS) | |
1440 static Elf32_Half running_arch_code=EM_MIPS; | |
1441 #elif (defined M68K) | |
1442 static Elf32_Half running_arch_code=EM_68K; | |
1443 #else | |
1444 #error Method os::dll_load requires that one of following is defined:\ | |
1445 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
1446 #endif | |
1447 | |
1448 // Identify compatability class for VM's architecture and library's architecture | |
1449 // Obtain string descriptions for architectures | |
1450 | |
1451 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1452 int running_arch_index=-1; | |
1453 | |
1454 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1455 if (running_arch_code == arch_array[i].code) { | |
1456 running_arch_index = i; | |
1457 } | |
1458 if (lib_arch.code == arch_array[i].code) { | |
1459 lib_arch.compat_class = arch_array[i].compat_class; | |
1460 lib_arch.name = arch_array[i].name; | |
1461 } | |
1462 } | |
1463 | |
1464 assert(running_arch_index != -1, | |
1465 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1466 if (running_arch_index == -1) { | |
1467 // Even though running architecture detection failed | |
1468 // we may still continue with reporting dlerror() message | |
1469 return NULL; | |
1470 } | |
1471 | |
1472 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1473 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1474 return NULL; | |
1475 } | |
1476 | |
1477 #ifndef S390 | |
1478 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
1479 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1480 return NULL; | |
1481 } | |
1482 #endif // !S390 | |
1483 | |
1484 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1485 if ( lib_arch.name!=NULL ) { | |
1486 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1487 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1488 lib_arch.name, arch_array[running_arch_index].name); | |
1489 } else { | |
1490 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1491 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1492 lib_arch.code, | |
1493 arch_array[running_arch_index].name); | |
1494 } | |
1495 } | |
1496 | |
1497 return NULL; | |
1498 } | |
1499 #endif /* !__APPLE__ */ | |
1500 | |
1501 // XXX: Do we need a lock around this as per Linux? | |
1502 void* os::dll_lookup(void* handle, const char* name) { | |
1503 return dlsym(handle, name); | |
1504 } | |
1505 | |
1506 | |
1507 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
1508 int fd = ::open(filename, O_RDONLY); | |
1509 if (fd == -1) { | |
1510 return false; | |
1511 } | |
1512 | |
1513 char buf[32]; | |
1514 int bytes; | |
1515 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
1516 st->print_raw(buf, bytes); | |
1517 } | |
1518 | |
1519 ::close(fd); | |
1520 | |
1521 return true; | |
1522 } | |
1523 | |
1524 void os::print_dll_info(outputStream *st) { | |
1525 st->print_cr("Dynamic libraries:"); | |
1526 #ifdef RTLD_DI_LINKMAP | |
1527 Dl_info dli; | |
1528 void *handle; | |
1529 Link_map *map; | |
1530 Link_map *p; | |
1531 | |
1532 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
1533 st->print_cr("Error: Cannot print dynamic libraries."); | |
1534 return; | |
1535 } | |
1536 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
1537 if (handle == NULL) { | |
1538 st->print_cr("Error: Cannot print dynamic libraries."); | |
1539 return; | |
1540 } | |
1541 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
1542 if (map == NULL) { | |
1543 st->print_cr("Error: Cannot print dynamic libraries."); | |
1544 return; | |
1545 } | |
1546 | |
1547 while (map->l_prev != NULL) | |
1548 map = map->l_prev; | |
1549 | |
1550 while (map != NULL) { | |
1551 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
1552 map = map->l_next; | |
1553 } | |
1554 | |
1555 dlclose(handle); | |
1556 #elif defined(__APPLE__) | |
1557 uint32_t count; | |
1558 uint32_t i; | |
1559 | |
1560 count = _dyld_image_count(); | |
1561 for (i = 1; i < count; i++) { | |
1562 const char *name = _dyld_get_image_name(i); | |
1563 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
1564 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
1565 } | |
1566 #else | |
1567 st->print_cr("Error: Cannot print dynamic libraries."); | |
1568 #endif | |
1569 } | |
1570 | |
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1571 void os::print_os_info_brief(outputStream* st) { |
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1572 st->print("Bsd"); |
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1573 |
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1574 os::Posix::print_uname_info(st); |
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1575 } |
3960 | 1576 |
1577 void os::print_os_info(outputStream* st) { | |
1578 st->print("OS:"); | |
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1579 st->print("Bsd"); |
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1580 |
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1581 os::Posix::print_uname_info(st); |
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1582 |
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1583 os::Posix::print_rlimit_info(st); |
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1584 |
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1585 os::Posix::print_load_average(st); |
3960 | 1586 } |
1587 | |
1588 void os::pd_print_cpu_info(outputStream* st) { | |
1589 // Nothing to do for now. | |
1590 } | |
1591 | |
1592 void os::print_memory_info(outputStream* st) { | |
1593 | |
1594 st->print("Memory:"); | |
1595 st->print(" %dk page", os::vm_page_size()>>10); | |
1596 | |
1597 st->print(", physical " UINT64_FORMAT "k", | |
1598 os::physical_memory() >> 10); | |
1599 st->print("(" UINT64_FORMAT "k free)", | |
1600 os::available_memory() >> 10); | |
1601 st->cr(); | |
1602 | |
1603 // meminfo | |
1604 st->print("\n/proc/meminfo:\n"); | |
1605 _print_ascii_file("/proc/meminfo", st); | |
1606 st->cr(); | |
1607 } | |
1608 | |
1609 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
1610 // but they're the same for all the bsd arch that we support | |
1611 // and they're the same for solaris but there's no common place to put this. | |
1612 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
1613 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
1614 "ILL_COPROC", "ILL_BADSTK" }; | |
1615 | |
1616 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
1617 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
1618 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
1619 | |
1620 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
1621 | |
1622 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
1623 | |
1624 void os::print_siginfo(outputStream* st, void* siginfo) { | |
1625 st->print("siginfo:"); | |
1626 | |
1627 const int buflen = 100; | |
1628 char buf[buflen]; | |
1629 siginfo_t *si = (siginfo_t*)siginfo; | |
1630 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
1631 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
1632 st->print("si_errno=%s", buf); | |
1633 } else { | |
1634 st->print("si_errno=%d", si->si_errno); | |
1635 } | |
1636 const int c = si->si_code; | |
1637 assert(c > 0, "unexpected si_code"); | |
1638 switch (si->si_signo) { | |
1639 case SIGILL: | |
1640 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
1641 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1642 break; | |
1643 case SIGFPE: | |
1644 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
1645 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1646 break; | |
1647 case SIGSEGV: | |
1648 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
1649 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1650 break; | |
1651 case SIGBUS: | |
1652 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
1653 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
1654 break; | |
1655 default: | |
1656 st->print(", si_code=%d", si->si_code); | |
1657 // no si_addr | |
1658 } | |
1659 | |
1660 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
1661 UseSharedSpaces) { | |
1662 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
1663 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
1664 st->print("\n\nError accessing class data sharing archive." \ | |
1665 " Mapped file inaccessible during execution, " \ | |
1666 " possible disk/network problem."); | |
1667 } | |
1668 } | |
1669 st->cr(); | |
1670 } | |
1671 | |
1672 | |
1673 static void print_signal_handler(outputStream* st, int sig, | |
1674 char* buf, size_t buflen); | |
1675 | |
1676 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1677 st->print_cr("Signal Handlers:"); | |
1678 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1679 print_signal_handler(st, SIGBUS , buf, buflen); | |
1680 print_signal_handler(st, SIGFPE , buf, buflen); | |
1681 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1682 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1683 print_signal_handler(st, SIGILL , buf, buflen); | |
1684 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1685 print_signal_handler(st, SR_signum, buf, buflen); | |
1686 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1687 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1688 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1689 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1690 } | |
1691 | |
1692 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1693 | |
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1694 // Find the full path to the current module, libjvm |
3960 | 1695 void os::jvm_path(char *buf, jint buflen) { |
1696 // Error checking. | |
1697 if (buflen < MAXPATHLEN) { | |
1698 assert(false, "must use a large-enough buffer"); | |
1699 buf[0] = '\0'; | |
1700 return; | |
1701 } | |
1702 // Lazy resolve the path to current module. | |
1703 if (saved_jvm_path[0] != 0) { | |
1704 strcpy(buf, saved_jvm_path); | |
1705 return; | |
1706 } | |
1707 | |
1708 char dli_fname[MAXPATHLEN]; | |
1709 bool ret = dll_address_to_library_name( | |
1710 CAST_FROM_FN_PTR(address, os::jvm_path), | |
1711 dli_fname, sizeof(dli_fname), NULL); | |
1712 assert(ret != 0, "cannot locate libjvm"); | |
1713 char *rp = realpath(dli_fname, buf); | |
1714 if (rp == NULL) | |
1715 return; | |
1716 | |
1717 if (Arguments::created_by_gamma_launcher()) { | |
1718 // Support for the gamma launcher. Typical value for buf is | |
4846 | 1719 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
3960 | 1720 // the right place in the string, then assume we are installed in a JDK and |
4846 | 1721 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
1722 // construct a path to the JVM being overridden. | |
1723 | |
3960 | 1724 const char *p = buf + strlen(buf) - 1; |
1725 for (int count = 0; p > buf && count < 5; ++count) { | |
1726 for (--p; p > buf && *p != '/'; --p) | |
1727 /* empty */ ; | |
1728 } | |
1729 | |
1730 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
1731 // Look for JAVA_HOME in the environment. | |
1732 char* java_home_var = ::getenv("JAVA_HOME"); | |
1733 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1734 char* jrelib_p; | |
1735 int len; | |
1736 | |
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1737 // Check the current module name "libjvm" |
3960 | 1738 p = strrchr(buf, '/'); |
1739 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
1740 | |
1741 rp = realpath(java_home_var, buf); | |
1742 if (rp == NULL) | |
1743 return; | |
1744 | |
1745 // determine if this is a legacy image or modules image | |
1746 // modules image doesn't have "jre" subdirectory | |
1747 len = strlen(buf); | |
1748 jrelib_p = buf + len; | |
4846 | 1749 |
1750 // Add the appropriate library subdir | |
1751 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
3960 | 1752 if (0 != access(buf, F_OK)) { |
4846 | 1753 snprintf(jrelib_p, buflen-len, "/lib"); |
3960 | 1754 } |
1755 | |
4846 | 1756 // Add the appropriate client or server subdir |
1757 len = strlen(buf); | |
1758 jrelib_p = buf + len; | |
1759 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
1760 if (0 != access(buf, F_OK)) { | |
1761 snprintf(jrelib_p, buflen-len, ""); | |
1762 } | |
1763 | |
1764 // If the path exists within JAVA_HOME, add the JVM library name | |
1765 // to complete the path to JVM being overridden. Otherwise fallback | |
1766 // to the path to the current library. | |
3960 | 1767 if (0 == access(buf, F_OK)) { |
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1768 // Use current module name "libjvm" |
3960 | 1769 len = strlen(buf); |
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1770 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
3960 | 1771 } else { |
4846 | 1772 // Fall back to path of current library |
3960 | 1773 rp = realpath(dli_fname, buf); |
1774 if (rp == NULL) | |
1775 return; | |
1776 } | |
1777 } | |
1778 } | |
1779 } | |
1780 | |
1781 strcpy(saved_jvm_path, buf); | |
1782 } | |
1783 | |
1784 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1785 // no prefix required, not even "_" | |
1786 } | |
1787 | |
1788 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1789 // no suffix required | |
1790 } | |
1791 | |
1792 //////////////////////////////////////////////////////////////////////////////// | |
1793 // sun.misc.Signal support | |
1794 | |
1795 static volatile jint sigint_count = 0; | |
1796 | |
1797 static void | |
1798 UserHandler(int sig, void *siginfo, void *context) { | |
1799 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1800 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1801 // don't want to flood the manager thread with sem_post requests. | |
1802 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1803 return; | |
1804 | |
1805 // Ctrl-C is pressed during error reporting, likely because the error | |
1806 // handler fails to abort. Let VM die immediately. | |
1807 if (sig == SIGINT && is_error_reported()) { | |
1808 os::die(); | |
1809 } | |
1810 | |
1811 os::signal_notify(sig); | |
1812 } | |
1813 | |
1814 void* os::user_handler() { | |
1815 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1816 } | |
1817 | |
1818 extern "C" { | |
1819 typedef void (*sa_handler_t)(int); | |
1820 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1821 } | |
1822 | |
1823 void* os::signal(int signal_number, void* handler) { | |
1824 struct sigaction sigAct, oldSigAct; | |
1825 | |
1826 sigfillset(&(sigAct.sa_mask)); | |
1827 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1828 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1829 | |
1830 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1831 // -1 means registration failed | |
1832 return (void *)-1; | |
1833 } | |
1834 | |
1835 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1836 } | |
1837 | |
1838 void os::signal_raise(int signal_number) { | |
1839 ::raise(signal_number); | |
1840 } | |
1841 | |
1842 /* | |
1843 * The following code is moved from os.cpp for making this | |
1844 * code platform specific, which it is by its very nature. | |
1845 */ | |
1846 | |
1847 // Will be modified when max signal is changed to be dynamic | |
1848 int os::sigexitnum_pd() { | |
1849 return NSIG; | |
1850 } | |
1851 | |
1852 // a counter for each possible signal value | |
1853 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1854 | |
1855 // Bsd(POSIX) specific hand shaking semaphore. | |
1856 #ifdef __APPLE__ | |
1857 static semaphore_t sig_sem; | |
1858 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) | |
1859 #define SEM_WAIT(sem) semaphore_wait(sem); | |
1860 #define SEM_POST(sem) semaphore_signal(sem); | |
1861 #else | |
1862 static sem_t sig_sem; | |
1863 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) | |
1864 #define SEM_WAIT(sem) sem_wait(&sem); | |
1865 #define SEM_POST(sem) sem_post(&sem); | |
1866 #endif | |
1867 | |
1868 void os::signal_init_pd() { | |
1869 // Initialize signal structures | |
1870 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
1871 | |
1872 // Initialize signal semaphore | |
1873 ::SEM_INIT(sig_sem, 0); | |
1874 } | |
1875 | |
1876 void os::signal_notify(int sig) { | |
1877 Atomic::inc(&pending_signals[sig]); | |
1878 ::SEM_POST(sig_sem); | |
1879 } | |
1880 | |
1881 static int check_pending_signals(bool wait) { | |
1882 Atomic::store(0, &sigint_count); | |
1883 for (;;) { | |
1884 for (int i = 0; i < NSIG + 1; i++) { | |
1885 jint n = pending_signals[i]; | |
1886 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
1887 return i; | |
1888 } | |
1889 } | |
1890 if (!wait) { | |
1891 return -1; | |
1892 } | |
1893 JavaThread *thread = JavaThread::current(); | |
1894 ThreadBlockInVM tbivm(thread); | |
1895 | |
1896 bool threadIsSuspended; | |
1897 do { | |
1898 thread->set_suspend_equivalent(); | |
1899 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
1900 ::SEM_WAIT(sig_sem); | |
1901 | |
1902 // were we externally suspended while we were waiting? | |
1903 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
1904 if (threadIsSuspended) { | |
1905 // | |
1906 // The semaphore has been incremented, but while we were waiting | |
1907 // another thread suspended us. We don't want to continue running | |
1908 // while suspended because that would surprise the thread that | |
1909 // suspended us. | |
1910 // | |
1911 ::SEM_POST(sig_sem); | |
1912 | |
1913 thread->java_suspend_self(); | |
1914 } | |
1915 } while (threadIsSuspended); | |
1916 } | |
1917 } | |
1918 | |
1919 int os::signal_lookup() { | |
1920 return check_pending_signals(false); | |
1921 } | |
1922 | |
1923 int os::signal_wait() { | |
1924 return check_pending_signals(true); | |
1925 } | |
1926 | |
1927 //////////////////////////////////////////////////////////////////////////////// | |
1928 // Virtual Memory | |
1929 | |
1930 int os::vm_page_size() { | |
1931 // Seems redundant as all get out | |
1932 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
1933 return os::Bsd::page_size(); | |
1934 } | |
1935 | |
1936 // Solaris allocates memory by pages. | |
1937 int os::vm_allocation_granularity() { | |
1938 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
1939 return os::Bsd::page_size(); | |
1940 } | |
1941 | |
1942 // Rationale behind this function: | |
1943 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
1944 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
1945 // samples for JITted code. Here we create private executable mapping over the code cache | |
1946 // and then we can use standard (well, almost, as mapping can change) way to provide | |
1947 // info for the reporting script by storing timestamp and location of symbol | |
1948 void bsd_wrap_code(char* base, size_t size) { | |
1949 static volatile jint cnt = 0; | |
1950 | |
1951 if (!UseOprofile) { | |
1952 return; | |
1953 } | |
1954 | |
1955 char buf[PATH_MAX + 1]; | |
1956 int num = Atomic::add(1, &cnt); | |
1957 | |
1958 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
1959 os::get_temp_directory(), os::current_process_id(), num); | |
1960 unlink(buf); | |
1961 | |
1962 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
1963 | |
1964 if (fd != -1) { | |
1965 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
1966 if (rv != (off_t)-1) { | |
1967 if (::write(fd, "", 1) == 1) { | |
1968 mmap(base, size, | |
1969 PROT_READ|PROT_WRITE|PROT_EXEC, | |
1970 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
1971 } | |
1972 } | |
1973 ::close(fd); | |
1974 unlink(buf); | |
1975 } | |
1976 } | |
1977 | |
1978 // NOTE: Bsd kernel does not really reserve the pages for us. | |
1979 // All it does is to check if there are enough free pages | |
1980 // left at the time of mmap(). This could be a potential | |
1981 // problem. | |
6197 | 1982 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
3960 | 1983 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
1984 #ifdef __OpenBSD__ | |
1985 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
1986 return ::mprotect(addr, size, prot) == 0; | |
1987 #else | |
1988 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
1989 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
1990 return res != (uintptr_t) MAP_FAILED; | |
1991 #endif | |
1992 } | |
1993 | |
1994 | |
6197 | 1995 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
3960 | 1996 bool exec) { |
1997 return commit_memory(addr, size, exec); | |
1998 } | |
1999 | |
6197 | 2000 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2001 } |
2002 | |
6197 | 2003 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2004 ::madvise(addr, bytes, MADV_DONTNEED); |
2005 } | |
2006 | |
2007 void os::numa_make_global(char *addr, size_t bytes) { | |
2008 } | |
2009 | |
2010 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2011 } | |
2012 | |
2013 bool os::numa_topology_changed() { return false; } | |
2014 | |
2015 size_t os::numa_get_groups_num() { | |
2016 return 1; | |
2017 } | |
2018 | |
2019 int os::numa_get_group_id() { | |
2020 return 0; | |
2021 } | |
2022 | |
2023 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2024 if (size > 0) { | |
2025 ids[0] = 0; | |
2026 return 1; | |
2027 } | |
2028 return 0; | |
2029 } | |
2030 | |
2031 bool os::get_page_info(char *start, page_info* info) { | |
2032 return false; | |
2033 } | |
2034 | |
2035 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2036 return end; | |
2037 } | |
2038 | |
2039 | |
6197 | 2040 bool os::pd_uncommit_memory(char* addr, size_t size) { |
3960 | 2041 #ifdef __OpenBSD__ |
2042 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
2043 return ::mprotect(addr, size, PROT_NONE) == 0; | |
2044 #else | |
2045 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
2046 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
2047 return res != (uintptr_t) MAP_FAILED; | |
2048 #endif | |
2049 } | |
2050 | |
6197 | 2051 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
3960 | 2052 return os::commit_memory(addr, size); |
2053 } | |
2054 | |
2055 // If this is a growable mapping, remove the guard pages entirely by | |
2056 // munmap()ping them. If not, just call uncommit_memory(). | |
2057 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2058 return os::uncommit_memory(addr, size); | |
2059 } | |
2060 | |
2061 static address _highest_vm_reserved_address = NULL; | |
2062 | |
2063 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2064 // at 'requested_addr'. If there are existing memory mappings at the same | |
2065 // location, however, they will be overwritten. If 'fixed' is false, | |
2066 // 'requested_addr' is only treated as a hint, the return value may or | |
2067 // may not start from the requested address. Unlike Bsd mmap(), this | |
2068 // function returns NULL to indicate failure. | |
2069 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2070 char * addr; | |
2071 int flags; | |
2072 | |
2073 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2074 if (fixed) { | |
2075 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
2076 flags |= MAP_FIXED; | |
2077 } | |
2078 | |
10157 | 2079 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
2080 // touch an uncommitted page. Otherwise, the read/write might | |
2081 // succeed if we have enough swap space to back the physical page. | |
2082 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
3960 | 2083 flags, -1, 0); |
2084 | |
2085 if (addr != MAP_FAILED) { | |
2086 // anon_mmap() should only get called during VM initialization, | |
2087 // don't need lock (actually we can skip locking even it can be called | |
2088 // from multiple threads, because _highest_vm_reserved_address is just a | |
2089 // hint about the upper limit of non-stack memory regions.) | |
2090 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2091 _highest_vm_reserved_address = (address)addr + bytes; | |
2092 } | |
2093 } | |
2094 | |
2095 return addr == MAP_FAILED ? NULL : addr; | |
2096 } | |
2097 | |
2098 // Don't update _highest_vm_reserved_address, because there might be memory | |
2099 // regions above addr + size. If so, releasing a memory region only creates | |
2100 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2101 // | |
2102 static int anon_munmap(char * addr, size_t size) { | |
2103 return ::munmap(addr, size) == 0; | |
2104 } | |
2105 | |
6197 | 2106 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
3960 | 2107 size_t alignment_hint) { |
2108 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2109 } | |
2110 | |
6197 | 2111 bool os::pd_release_memory(char* addr, size_t size) { |
3960 | 2112 return anon_munmap(addr, size); |
2113 } | |
2114 | |
2115 static address highest_vm_reserved_address() { | |
2116 return _highest_vm_reserved_address; | |
2117 } | |
2118 | |
2119 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
2120 // Bsd wants the mprotect address argument to be page aligned. | |
2121 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
2122 | |
2123 // According to SUSv3, mprotect() should only be used with mappings | |
2124 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2125 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2126 // protection of malloc'ed or statically allocated memory). Check the | |
2127 // caller if you hit this assert. | |
2128 assert(addr == bottom, "sanity check"); | |
2129 | |
2130 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
2131 return ::mprotect(bottom, size, prot) == 0; | |
2132 } | |
2133 | |
2134 // Set protections specified | |
2135 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
2136 bool is_committed) { | |
2137 unsigned int p = 0; | |
2138 switch (prot) { | |
2139 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2140 case MEM_PROT_READ: p = PROT_READ; break; | |
2141 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2142 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2143 default: | |
2144 ShouldNotReachHere(); | |
2145 } | |
2146 // is_committed is unused. | |
2147 return bsd_mprotect(addr, bytes, p); | |
2148 } | |
2149 | |
2150 bool os::guard_memory(char* addr, size_t size) { | |
2151 return bsd_mprotect(addr, size, PROT_NONE); | |
2152 } | |
2153 | |
2154 bool os::unguard_memory(char* addr, size_t size) { | |
2155 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
2156 } | |
2157 | |
2158 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
6918 | 2159 return false; |
3960 | 2160 } |
2161 | |
2162 /* | |
2163 * Set the coredump_filter bits to include largepages in core dump (bit 6) | |
2164 * | |
2165 * From the coredump_filter documentation: | |
2166 * | |
2167 * - (bit 0) anonymous private memory | |
2168 * - (bit 1) anonymous shared memory | |
2169 * - (bit 2) file-backed private memory | |
2170 * - (bit 3) file-backed shared memory | |
2171 * - (bit 4) ELF header pages in file-backed private memory areas (it is | |
2172 * effective only if the bit 2 is cleared) | |
2173 * - (bit 5) hugetlb private memory | |
2174 * - (bit 6) hugetlb shared memory | |
2175 */ | |
2176 static void set_coredump_filter(void) { | |
2177 FILE *f; | |
2178 long cdm; | |
2179 | |
2180 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { | |
2181 return; | |
2182 } | |
2183 | |
2184 if (fscanf(f, "%lx", &cdm) != 1) { | |
2185 fclose(f); | |
2186 return; | |
2187 } | |
2188 | |
2189 rewind(f); | |
2190 | |
2191 if ((cdm & LARGEPAGES_BIT) == 0) { | |
2192 cdm |= LARGEPAGES_BIT; | |
2193 fprintf(f, "%#lx", cdm); | |
2194 } | |
2195 | |
2196 fclose(f); | |
2197 } | |
2198 | |
2199 // Large page support | |
2200 | |
2201 static size_t _large_page_size = 0; | |
2202 | |
2203 void os::large_page_init() { | |
2204 } | |
2205 | |
2206 | |
2207 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
2208 // "exec" is passed in but not used. Creating the shared image for | |
2209 // the code cache doesn't have an SHM_X executable permission to check. | |
2210 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
2211 | |
2212 key_t key = IPC_PRIVATE; | |
2213 char *addr; | |
2214 | |
2215 bool warn_on_failure = UseLargePages && | |
2216 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2217 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2218 ); | |
2219 char msg[128]; | |
2220 | |
2221 // Create a large shared memory region to attach to based on size. | |
2222 // Currently, size is the total size of the heap | |
2223 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
2224 if (shmid == -1) { | |
2225 // Possible reasons for shmget failure: | |
2226 // 1. shmmax is too small for Java heap. | |
2227 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2228 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2229 // 2. not enough large page memory. | |
2230 // > check available large pages: cat /proc/meminfo | |
2231 // > increase amount of large pages: | |
2232 // echo new_value > /proc/sys/vm/nr_hugepages | |
2233 // Note 1: different Bsd may use different name for this property, | |
2234 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2235 // Note 2: it's possible there's enough physical memory available but | |
2236 // they are so fragmented after a long run that they can't | |
2237 // coalesce into large pages. Try to reserve large pages when | |
2238 // the system is still "fresh". | |
2239 if (warn_on_failure) { | |
2240 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2241 warning(msg); | |
2242 } | |
2243 return NULL; | |
2244 } | |
2245 | |
2246 // attach to the region | |
2247 addr = (char*)shmat(shmid, req_addr, 0); | |
2248 int err = errno; | |
2249 | |
2250 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2251 // will be deleted when it's detached by shmdt() or when the process | |
2252 // terminates. If shmat() is not successful this will remove the shared | |
2253 // segment immediately. | |
2254 shmctl(shmid, IPC_RMID, NULL); | |
2255 | |
2256 if ((intptr_t)addr == -1) { | |
2257 if (warn_on_failure) { | |
2258 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2259 warning(msg); | |
2260 } | |
2261 return NULL; | |
2262 } | |
2263 | |
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2264 // The memory is committed |
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2265 address pc = CALLER_PC; |
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2266 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); |
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2267 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); |
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2268 |
3960 | 2269 return addr; |
2270 } | |
2271 | |
2272 bool os::release_memory_special(char* base, size_t bytes) { | |
2273 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
2274 int rslt = shmdt(base); | |
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2275 if (rslt == 0) { |
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2276 MemTracker::record_virtual_memory_uncommit((address)base, bytes); |
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2277 MemTracker::record_virtual_memory_release((address)base, bytes); |
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2278 return true; |
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2279 } else { |
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2280 return false; |
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2281 } |
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2282 |
3960 | 2283 } |
2284 | |
2285 size_t os::large_page_size() { | |
2286 return _large_page_size; | |
2287 } | |
2288 | |
2289 // HugeTLBFS allows application to commit large page memory on demand; | |
2290 // with SysV SHM the entire memory region must be allocated as shared | |
2291 // memory. | |
2292 bool os::can_commit_large_page_memory() { | |
2293 return UseHugeTLBFS; | |
2294 } | |
2295 | |
2296 bool os::can_execute_large_page_memory() { | |
2297 return UseHugeTLBFS; | |
2298 } | |
2299 | |
2300 // Reserve memory at an arbitrary address, only if that area is | |
2301 // available (and not reserved for something else). | |
2302 | |
6197 | 2303 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
3960 | 2304 const int max_tries = 10; |
2305 char* base[max_tries]; | |
2306 size_t size[max_tries]; | |
2307 const size_t gap = 0x000000; | |
2308 | |
2309 // Assert only that the size is a multiple of the page size, since | |
2310 // that's all that mmap requires, and since that's all we really know | |
2311 // about at this low abstraction level. If we need higher alignment, | |
2312 // we can either pass an alignment to this method or verify alignment | |
2313 // in one of the methods further up the call chain. See bug 5044738. | |
2314 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
2315 | |
2316 // Repeatedly allocate blocks until the block is allocated at the | |
2317 // right spot. Give up after max_tries. Note that reserve_memory() will | |
2318 // automatically update _highest_vm_reserved_address if the call is | |
2319 // successful. The variable tracks the highest memory address every reserved | |
2320 // by JVM. It is used to detect heap-stack collision if running with | |
2321 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
2322 // space than needed, it could confuse the collision detecting code. To | |
2323 // solve the problem, save current _highest_vm_reserved_address and | |
2324 // calculate the correct value before return. | |
2325 address old_highest = _highest_vm_reserved_address; | |
2326 | |
2327 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
2328 // if kernel honors the hint then we can return immediately. | |
2329 char * addr = anon_mmap(requested_addr, bytes, false); | |
2330 if (addr == requested_addr) { | |
2331 return requested_addr; | |
2332 } | |
2333 | |
2334 if (addr != NULL) { | |
2335 // mmap() is successful but it fails to reserve at the requested address | |
2336 anon_munmap(addr, bytes); | |
2337 } | |
2338 | |
2339 int i; | |
2340 for (i = 0; i < max_tries; ++i) { | |
2341 base[i] = reserve_memory(bytes); | |
2342 | |
2343 if (base[i] != NULL) { | |
2344 // Is this the block we wanted? | |
2345 if (base[i] == requested_addr) { | |
2346 size[i] = bytes; | |
2347 break; | |
2348 } | |
2349 | |
2350 // Does this overlap the block we wanted? Give back the overlapped | |
2351 // parts and try again. | |
2352 | |
2353 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
2354 if (top_overlap >= 0 && top_overlap < bytes) { | |
2355 unmap_memory(base[i], top_overlap); | |
2356 base[i] += top_overlap; | |
2357 size[i] = bytes - top_overlap; | |
2358 } else { | |
2359 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
2360 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
2361 unmap_memory(requested_addr, bottom_overlap); | |
2362 size[i] = bytes - bottom_overlap; | |
2363 } else { | |
2364 size[i] = bytes; | |
2365 } | |
2366 } | |
2367 } | |
2368 } | |
2369 | |
2370 // Give back the unused reserved pieces. | |
2371 | |
2372 for (int j = 0; j < i; ++j) { | |
2373 if (base[j] != NULL) { | |
2374 unmap_memory(base[j], size[j]); | |
2375 } | |
2376 } | |
2377 | |
2378 if (i < max_tries) { | |
2379 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
2380 return requested_addr; | |
2381 } else { | |
2382 _highest_vm_reserved_address = old_highest; | |
2383 return NULL; | |
2384 } | |
2385 } | |
2386 | |
2387 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2388 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
2389 } | |
2390 | |
2391 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
2392 // Solaris uses poll(), bsd uses park(). | |
2393 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
2394 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
2395 // SIGSEGV, see 4355769. | |
2396 | |
2397 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2398 assert(thread == Thread::current(), "thread consistency check"); | |
2399 | |
2400 ParkEvent * const slp = thread->_SleepEvent ; | |
2401 slp->reset() ; | |
2402 OrderAccess::fence() ; | |
2403 | |
2404 if (interruptible) { | |
2405 jlong prevtime = javaTimeNanos(); | |
2406 | |
2407 for (;;) { | |
2408 if (os::is_interrupted(thread, true)) { | |
2409 return OS_INTRPT; | |
2410 } | |
2411 | |
2412 jlong newtime = javaTimeNanos(); | |
2413 | |
2414 if (newtime - prevtime < 0) { | |
2415 // time moving backwards, should only happen if no monotonic clock | |
2416 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2417 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2418 } else { | |
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2419 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2420 } |
2421 | |
2422 if(millis <= 0) { | |
2423 return OS_OK; | |
2424 } | |
2425 | |
2426 prevtime = newtime; | |
2427 | |
2428 { | |
2429 assert(thread->is_Java_thread(), "sanity check"); | |
2430 JavaThread *jt = (JavaThread *) thread; | |
2431 ThreadBlockInVM tbivm(jt); | |
2432 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2433 | |
2434 jt->set_suspend_equivalent(); | |
2435 // cleared by handle_special_suspend_equivalent_condition() or | |
2436 // java_suspend_self() via check_and_wait_while_suspended() | |
2437 | |
2438 slp->park(millis); | |
2439 | |
2440 // were we externally suspended while we were waiting? | |
2441 jt->check_and_wait_while_suspended(); | |
2442 } | |
2443 } | |
2444 } else { | |
2445 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2446 jlong prevtime = javaTimeNanos(); | |
2447 | |
2448 for (;;) { | |
2449 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2450 // the 1st iteration ... | |
2451 jlong newtime = javaTimeNanos(); | |
2452 | |
2453 if (newtime - prevtime < 0) { | |
2454 // time moving backwards, should only happen if no monotonic clock | |
2455 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2456 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2457 } else { | |
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2458 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2459 } |
2460 | |
2461 if(millis <= 0) break ; | |
2462 | |
2463 prevtime = newtime; | |
2464 slp->park(millis); | |
2465 } | |
2466 return OS_OK ; | |
2467 } | |
2468 } | |
2469 | |
2470 int os::naked_sleep() { | |
2471 // %% make the sleep time an integer flag. for now use 1 millisec. | |
2472 return os::sleep(Thread::current(), 1, false); | |
2473 } | |
2474 | |
2475 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2476 void os::infinite_sleep() { | |
2477 while (true) { // sleep forever ... | |
2478 ::sleep(100); // ... 100 seconds at a time | |
2479 } | |
2480 } | |
2481 | |
2482 // Used to convert frequent JVM_Yield() to nops | |
2483 bool os::dont_yield() { | |
2484 return DontYieldALot; | |
2485 } | |
2486 | |
2487 void os::yield() { | |
2488 sched_yield(); | |
2489 } | |
2490 | |
2491 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
2492 | |
2493 void os::yield_all(int attempts) { | |
2494 // Yields to all threads, including threads with lower priorities | |
2495 // Threads on Bsd are all with same priority. The Solaris style | |
2496 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2497 sched_yield(); | |
2498 } | |
2499 | |
2500 // Called from the tight loops to possibly influence time-sharing heuristics | |
2501 void os::loop_breaker(int attempts) { | |
2502 os::yield_all(attempts); | |
2503 } | |
2504 | |
2505 //////////////////////////////////////////////////////////////////////////////// | |
2506 // thread priority support | |
2507 | |
2508 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
2509 // only supports dynamic priority, static priority must be zero. For real-time | |
2510 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
2511 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
2512 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
2513 // of 5 runs - Sep 2005). | |
2514 // | |
2515 // The following code actually changes the niceness of kernel-thread/LWP. It | |
2516 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
2517 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
2518 // threads. It has always been the case, but could change in the future. For | |
2519 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
2520 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
2521 | |
6918 | 2522 #if !defined(__APPLE__) |
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2523 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2524 19, // 0 Entry should never be used |
2525 | |
2526 0, // 1 MinPriority | |
2527 3, // 2 | |
2528 6, // 3 | |
2529 | |
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2530 10, // 4 |
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2531 15, // 5 NormPriority |
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2532 18, // 6 |
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2533 |
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2534 21, // 7 |
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2535 25, // 8 |
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2536 28, // 9 NearMaxPriority |
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2537 |
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2538 31, // 10 MaxPriority |
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2539 |
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2540 31 // 11 CriticalPriority |
3960 | 2541 }; |
6918 | 2542 #else |
3960 | 2543 /* Using Mach high-level priority assignments */ |
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2544 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2545 0, // 0 Entry should never be used (MINPRI_USER) |
2546 | |
2547 27, // 1 MinPriority | |
2548 28, // 2 | |
2549 29, // 3 | |
2550 | |
2551 30, // 4 | |
2552 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
2553 32, // 6 | |
2554 | |
2555 33, // 7 | |
2556 34, // 8 | |
2557 35, // 9 NearMaxPriority | |
2558 | |
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2559 36, // 10 MaxPriority |
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2560 |
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2561 36 // 11 CriticalPriority |
3960 | 2562 }; |
2563 #endif | |
2564 | |
2565 static int prio_init() { | |
2566 if (ThreadPriorityPolicy == 1) { | |
2567 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
2568 // if effective uid is not root. Perhaps, a more elegant way of doing | |
2569 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
2570 if (geteuid() != 0) { | |
2571 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
2572 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
2573 } | |
2574 ThreadPriorityPolicy = 0; | |
2575 } | |
2576 } | |
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2577 if (UseCriticalJavaThreadPriority) { |
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2578 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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2579 } |
3960 | 2580 return 0; |
2581 } | |
2582 | |
2583 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2584 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
2585 | |
2586 #ifdef __OpenBSD__ | |
2587 // OpenBSD pthread_setprio starves low priority threads | |
2588 return OS_OK; | |
2589 #elif defined(__FreeBSD__) | |
2590 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
2591 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2592 struct sched_param sp; | |
2593 int policy; | |
2594 pthread_t self = pthread_self(); | |
2595 | |
2596 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
2597 return OS_ERR; | |
2598 | |
2599 sp.sched_priority = newpri; | |
2600 if (pthread_setschedparam(self, policy, &sp) != 0) | |
2601 return OS_ERR; | |
2602 | |
2603 return OS_OK; | |
2604 #else | |
2605 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
2606 return (ret == 0) ? OS_OK : OS_ERR; | |
2607 #endif | |
2608 } | |
2609 | |
2610 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2611 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
2612 *priority_ptr = java_to_os_priority[NormPriority]; | |
2613 return OS_OK; | |
2614 } | |
2615 | |
2616 errno = 0; | |
2617 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
2618 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
2619 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2620 int policy; | |
2621 struct sched_param sp; | |
2622 | |
2623 pthread_getschedparam(pthread_self(), &policy, &sp); | |
2624 *priority_ptr = sp.sched_priority; | |
2625 #else | |
2626 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
2627 #endif | |
2628 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
2629 } | |
2630 | |
2631 // Hint to the underlying OS that a task switch would not be good. | |
2632 // Void return because it's a hint and can fail. | |
2633 void os::hint_no_preempt() {} | |
2634 | |
2635 //////////////////////////////////////////////////////////////////////////////// | |
2636 // suspend/resume support | |
2637 | |
2638 // the low-level signal-based suspend/resume support is a remnant from the | |
2639 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2640 // within hotspot. Now there is a single use-case for this: | |
2641 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2642 // that runs in the watcher thread. | |
2643 // The remaining code is greatly simplified from the more general suspension | |
2644 // code that used to be used. | |
2645 // | |
2646 // The protocol is quite simple: | |
2647 // - suspend: | |
2648 // - sends a signal to the target thread | |
2649 // - polls the suspend state of the osthread using a yield loop | |
2650 // - target thread signal handler (SR_handler) sets suspend state | |
2651 // and blocks in sigsuspend until continued | |
2652 // - resume: | |
2653 // - sets target osthread state to continue | |
2654 // - sends signal to end the sigsuspend loop in the SR_handler | |
2655 // | |
2656 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
2657 // | |
2658 | |
2659 static void resume_clear_context(OSThread *osthread) { | |
2660 osthread->set_ucontext(NULL); | |
2661 osthread->set_siginfo(NULL); | |
2662 | |
2663 // notify the suspend action is completed, we have now resumed | |
2664 osthread->sr.clear_suspended(); | |
2665 } | |
2666 | |
2667 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
2668 osthread->set_ucontext(context); | |
2669 osthread->set_siginfo(siginfo); | |
2670 } | |
2671 | |
2672 // | |
2673 // Handler function invoked when a thread's execution is suspended or | |
2674 // resumed. We have to be careful that only async-safe functions are | |
2675 // called here (Note: most pthread functions are not async safe and | |
2676 // should be avoided.) | |
2677 // | |
2678 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
2679 // interface point of view, but sigwait() prevents the signal hander | |
2680 // from being run. libpthread would get very confused by not having | |
2681 // its signal handlers run and prevents sigwait()'s use with the | |
2682 // mutex granting granting signal. | |
2683 // | |
2684 // Currently only ever called on the VMThread | |
2685 // | |
2686 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
2687 // Save and restore errno to avoid confusing native code with EINTR | |
2688 // after sigsuspend. | |
2689 int old_errno = errno; | |
2690 | |
2691 Thread* thread = Thread::current(); | |
2692 OSThread* osthread = thread->osthread(); | |
2693 assert(thread->is_VM_thread(), "Must be VMThread"); | |
2694 // read current suspend action | |
2695 int action = osthread->sr.suspend_action(); | |
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2696 if (action == os::Bsd::SuspendResume::SR_SUSPEND) { |
3960 | 2697 suspend_save_context(osthread, siginfo, context); |
2698 | |
2699 // Notify the suspend action is about to be completed. do_suspend() | |
2700 // waits until SR_SUSPENDED is set and then returns. We will wait | |
2701 // here for a resume signal and that completes the suspend-other | |
2702 // action. do_suspend/do_resume is always called as a pair from | |
2703 // the same thread - so there are no races | |
2704 | |
2705 // notify the caller | |
2706 osthread->sr.set_suspended(); | |
2707 | |
2708 sigset_t suspend_set; // signals for sigsuspend() | |
2709 | |
2710 // get current set of blocked signals and unblock resume signal | |
2711 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
2712 sigdelset(&suspend_set, SR_signum); | |
2713 | |
2714 // wait here until we are resumed | |
2715 do { | |
2716 sigsuspend(&suspend_set); | |
2717 // ignore all returns until we get a resume signal | |
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2718 } while (osthread->sr.suspend_action() != os::Bsd::SuspendResume::SR_CONTINUE); |
3960 | 2719 |
2720 resume_clear_context(osthread); | |
2721 | |
2722 } else { | |
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2723 assert(action == os::Bsd::SuspendResume::SR_CONTINUE, "unexpected sr action"); |
3960 | 2724 // nothing special to do - just leave the handler |
2725 } | |
2726 | |
2727 errno = old_errno; | |
2728 } | |
2729 | |
2730 | |
2731 static int SR_initialize() { | |
2732 struct sigaction act; | |
2733 char *s; | |
2734 /* Get signal number to use for suspend/resume */ | |
2735 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
2736 int sig = ::strtol(s, 0, 10); | |
2737 if (sig > 0 || sig < NSIG) { | |
2738 SR_signum = sig; | |
2739 } | |
2740 } | |
2741 | |
2742 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
2743 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
2744 | |
2745 sigemptyset(&SR_sigset); | |
2746 sigaddset(&SR_sigset, SR_signum); | |
2747 | |
2748 /* Set up signal handler for suspend/resume */ | |
2749 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
2750 act.sa_handler = (void (*)(int)) SR_handler; | |
2751 | |
2752 // SR_signum is blocked by default. | |
2753 // 4528190 - We also need to block pthread restart signal (32 on all | |
2754 // supported Bsd platforms). Note that BsdThreads need to block | |
2755 // this signal for all threads to work properly. So we don't have | |
2756 // to use hard-coded signal number when setting up the mask. | |
2757 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
2758 | |
2759 if (sigaction(SR_signum, &act, 0) == -1) { | |
2760 return -1; | |
2761 } | |
2762 | |
2763 // Save signal flag | |
2764 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
2765 return 0; | |
2766 } | |
2767 | |
2768 | |
2769 // returns true on success and false on error - really an error is fatal | |
2770 // but this seems the normal response to library errors | |
2771 static bool do_suspend(OSThread* osthread) { | |
2772 // mark as suspended and send signal | |
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2773 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_SUSPEND); |
3960 | 2774 int status = pthread_kill(osthread->pthread_id(), SR_signum); |
2775 assert_status(status == 0, status, "pthread_kill"); | |
2776 | |
2777 // check status and wait until notified of suspension | |
2778 if (status == 0) { | |
2779 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
2780 os::yield_all(i); | |
2781 } | |
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2782 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); |
3960 | 2783 return true; |
2784 } | |
2785 else { | |
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2786 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); |
3960 | 2787 return false; |
2788 } | |
2789 } | |
2790 | |
2791 static void do_resume(OSThread* osthread) { | |
2792 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
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8067
diff
changeset
|
2793 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_CONTINUE); |
3960 | 2794 |
2795 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2796 assert_status(status == 0, status, "pthread_kill"); | |
2797 // check status and wait unit notified of resumption | |
2798 if (status == 0) { | |
2799 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
2800 os::yield_all(i); | |
2801 } | |
2802 } | |
8675
63e54c37ac64
8008959: Fix non-PCH build on Linux, Windows and MacOS X
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parents:
8067
diff
changeset
|
2803 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::SR_NONE); |
3960 | 2804 } |
2805 | |
2806 //////////////////////////////////////////////////////////////////////////////// | |
2807 // interrupt support | |
2808 | |
2809 void os::interrupt(Thread* thread) { | |
2810 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2811 "possibility of dangling Thread pointer"); | |
2812 | |
2813 OSThread* osthread = thread->osthread(); | |
2814 | |
2815 if (!osthread->interrupted()) { | |
2816 osthread->set_interrupted(true); | |
2817 // More than one thread can get here with the same value of osthread, | |
2818 // resulting in multiple notifications. We do, however, want the store | |
2819 // to interrupted() to be visible to other threads before we execute unpark(). | |
2820 OrderAccess::fence(); | |
2821 ParkEvent * const slp = thread->_SleepEvent ; | |
2822 if (slp != NULL) slp->unpark() ; | |
2823 } | |
2824 | |
2825 // For JSR166. Unpark even if interrupt status already was set | |
2826 if (thread->is_Java_thread()) | |
2827 ((JavaThread*)thread)->parker()->unpark(); | |
2828 | |
2829 ParkEvent * ev = thread->_ParkEvent ; | |
2830 if (ev != NULL) ev->unpark() ; | |
2831 | |
2832 } | |
2833 | |
2834 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
2835 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
2836 "possibility of dangling Thread pointer"); | |
2837 | |
2838 OSThread* osthread = thread->osthread(); | |
2839 | |
2840 bool interrupted = osthread->interrupted(); | |
2841 | |
2842 if (interrupted && clear_interrupted) { | |
2843 osthread->set_interrupted(false); | |
2844 // consider thread->_SleepEvent->reset() ... optional optimization | |
2845 } | |
2846 | |
2847 return interrupted; | |
2848 } | |
2849 | |
2850 /////////////////////////////////////////////////////////////////////////////////// | |
2851 // signal handling (except suspend/resume) | |
2852 | |
2853 // This routine may be used by user applications as a "hook" to catch signals. | |
2854 // The user-defined signal handler must pass unrecognized signals to this | |
2855 // routine, and if it returns true (non-zero), then the signal handler must | |
2856 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
2857 // routine will never retun false (zero), but instead will execute a VM panic | |
2858 // routine kill the process. | |
2859 // | |
2860 // If this routine returns false, it is OK to call it again. This allows | |
2861 // the user-defined signal handler to perform checks either before or after | |
2862 // the VM performs its own checks. Naturally, the user code would be making | |
2863 // a serious error if it tried to handle an exception (such as a null check | |
2864 // or breakpoint) that the VM was generating for its own correct operation. | |
2865 // | |
2866 // This routine may recognize any of the following kinds of signals: | |
2867 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
2868 // It should be consulted by handlers for any of those signals. | |
2869 // | |
2870 // The caller of this routine must pass in the three arguments supplied | |
2871 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
2872 // field of the structure passed to sigaction(). This routine assumes that | |
2873 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
2874 // | |
2875 // Note that the VM will print warnings if it detects conflicting signal | |
2876 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
2877 // | |
2878 extern "C" JNIEXPORT int | |
2879 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
2880 void* ucontext, int abort_if_unrecognized); | |
2881 | |
2882 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
2883 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 2884 int orig_errno = errno; // Preserve errno value over signal handler. |
3960 | 2885 JVM_handle_bsd_signal(sig, info, uc, true); |
8067 | 2886 errno = orig_errno; |
3960 | 2887 } |
2888 | |
2889 | |
2890 // This boolean allows users to forward their own non-matching signals | |
2891 // to JVM_handle_bsd_signal, harmlessly. | |
2892 bool os::Bsd::signal_handlers_are_installed = false; | |
2893 | |
2894 // For signal-chaining | |
2895 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
2896 unsigned int os::Bsd::sigs = 0; | |
2897 bool os::Bsd::libjsig_is_loaded = false; | |
2898 typedef struct sigaction *(*get_signal_t)(int); | |
2899 get_signal_t os::Bsd::get_signal_action = NULL; | |
2900 | |
2901 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
2902 struct sigaction *actp = NULL; | |
2903 | |
2904 if (libjsig_is_loaded) { | |
2905 // Retrieve the old signal handler from libjsig | |
2906 actp = (*get_signal_action)(sig); | |
2907 } | |
2908 if (actp == NULL) { | |
2909 // Retrieve the preinstalled signal handler from jvm | |
2910 actp = get_preinstalled_handler(sig); | |
2911 } | |
2912 | |
2913 return actp; | |
2914 } | |
2915 | |
2916 static bool call_chained_handler(struct sigaction *actp, int sig, | |
2917 siginfo_t *siginfo, void *context) { | |
2918 // Call the old signal handler | |
2919 if (actp->sa_handler == SIG_DFL) { | |
2920 // It's more reasonable to let jvm treat it as an unexpected exception | |
2921 // instead of taking the default action. | |
2922 return false; | |
2923 } else if (actp->sa_handler != SIG_IGN) { | |
2924 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
2925 // automaticlly block the signal | |
2926 sigaddset(&(actp->sa_mask), sig); | |
2927 } | |
2928 | |
2929 sa_handler_t hand; | |
2930 sa_sigaction_t sa; | |
2931 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
2932 // retrieve the chained handler | |
2933 if (siginfo_flag_set) { | |
2934 sa = actp->sa_sigaction; | |
2935 } else { | |
2936 hand = actp->sa_handler; | |
2937 } | |
2938 | |
2939 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
2940 actp->sa_handler = SIG_DFL; | |
2941 } | |
2942 | |
2943 // try to honor the signal mask | |
2944 sigset_t oset; | |
2945 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
2946 | |
2947 // call into the chained handler | |
2948 if (siginfo_flag_set) { | |
2949 (*sa)(sig, siginfo, context); | |
2950 } else { | |
2951 (*hand)(sig); | |
2952 } | |
2953 | |
2954 // restore the signal mask | |
2955 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
2956 } | |
2957 // Tell jvm's signal handler the signal is taken care of. | |
2958 return true; | |
2959 } | |
2960 | |
2961 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
2962 bool chained = false; | |
2963 // signal-chaining | |
2964 if (UseSignalChaining) { | |
2965 struct sigaction *actp = get_chained_signal_action(sig); | |
2966 if (actp != NULL) { | |
2967 chained = call_chained_handler(actp, sig, siginfo, context); | |
2968 } | |
2969 } | |
2970 return chained; | |
2971 } | |
2972 | |
2973 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
2974 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
2975 return &sigact[sig]; | |
2976 } | |
2977 return NULL; | |
2978 } | |
2979 | |
2980 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
2981 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2982 sigact[sig] = oldAct; | |
2983 sigs |= (unsigned int)1 << sig; | |
2984 } | |
2985 | |
2986 // for diagnostic | |
2987 int os::Bsd::sigflags[MAXSIGNUM]; | |
2988 | |
2989 int os::Bsd::get_our_sigflags(int sig) { | |
2990 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2991 return sigflags[sig]; | |
2992 } | |
2993 | |
2994 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
2995 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
2996 sigflags[sig] = flags; | |
2997 } | |
2998 | |
2999 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
3000 // Check for overwrite. | |
3001 struct sigaction oldAct; | |
3002 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3003 | |
3004 void* oldhand = oldAct.sa_sigaction | |
3005 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3006 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3007 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3008 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3009 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3010 if (AllowUserSignalHandlers || !set_installed) { | |
3011 // Do not overwrite; user takes responsibility to forward to us. | |
3012 return; | |
3013 } else if (UseSignalChaining) { | |
3014 // save the old handler in jvm | |
3015 save_preinstalled_handler(sig, oldAct); | |
3016 // libjsig also interposes the sigaction() call below and saves the | |
3017 // old sigaction on it own. | |
3018 } else { | |
3019 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3020 "%#lx for signal %d.", (long)oldhand, sig)); | |
3021 } | |
3022 } | |
3023 | |
3024 struct sigaction sigAct; | |
3025 sigfillset(&(sigAct.sa_mask)); | |
3026 sigAct.sa_handler = SIG_DFL; | |
3027 if (!set_installed) { | |
3028 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3029 } else { | |
3030 sigAct.sa_sigaction = signalHandler; | |
3031 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3032 } | |
3033 // Save flags, which are set by ours | |
3034 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3035 sigflags[sig] = sigAct.sa_flags; | |
3036 | |
3037 int ret = sigaction(sig, &sigAct, &oldAct); | |
3038 assert(ret == 0, "check"); | |
3039 | |
3040 void* oldhand2 = oldAct.sa_sigaction | |
3041 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3042 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3043 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3044 } | |
3045 | |
3046 // install signal handlers for signals that HotSpot needs to | |
3047 // handle in order to support Java-level exception handling. | |
3048 | |
3049 void os::Bsd::install_signal_handlers() { | |
3050 if (!signal_handlers_are_installed) { | |
3051 signal_handlers_are_installed = true; | |
3052 | |
3053 // signal-chaining | |
3054 typedef void (*signal_setting_t)(); | |
3055 signal_setting_t begin_signal_setting = NULL; | |
3056 signal_setting_t end_signal_setting = NULL; | |
3057 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3058 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3059 if (begin_signal_setting != NULL) { | |
3060 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3061 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3062 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3063 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3064 libjsig_is_loaded = true; | |
3065 assert(UseSignalChaining, "should enable signal-chaining"); | |
3066 } | |
3067 if (libjsig_is_loaded) { | |
3068 // Tell libjsig jvm is setting signal handlers | |
3069 (*begin_signal_setting)(); | |
3070 } | |
3071 | |
3072 set_signal_handler(SIGSEGV, true); | |
3073 set_signal_handler(SIGPIPE, true); | |
3074 set_signal_handler(SIGBUS, true); | |
3075 set_signal_handler(SIGILL, true); | |
3076 set_signal_handler(SIGFPE, true); | |
3077 set_signal_handler(SIGXFSZ, true); | |
3078 | |
3079 #if defined(__APPLE__) | |
3080 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
3081 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
3082 // signal handler that's placed on our process by CrashReporter. This disables | |
3083 // CrashReporter-based reporting. | |
3084 // | |
3085 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
3086 // on caught fatal signals. | |
3087 // | |
3088 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
3089 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
3090 // exception handling, while leaving the standard BSD signal handlers functional. | |
3091 kern_return_t kr; | |
3092 kr = task_set_exception_ports(mach_task_self(), | |
3093 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
3094 MACH_PORT_NULL, | |
3095 EXCEPTION_STATE_IDENTITY, | |
3096 MACHINE_THREAD_STATE); | |
3097 | |
3098 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
3099 #endif | |
3100 | |
3101 if (libjsig_is_loaded) { | |
3102 // Tell libjsig jvm finishes setting signal handlers | |
3103 (*end_signal_setting)(); | |
3104 } | |
3105 | |
3106 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3107 // and if UserSignalHandler is installed all bets are off | |
3108 if (CheckJNICalls) { | |
3109 if (libjsig_is_loaded) { | |
3110 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
3111 check_signals = false; | |
3112 } | |
3113 if (AllowUserSignalHandlers) { | |
3114 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
3115 check_signals = false; | |
3116 } | |
3117 } | |
3118 } | |
3119 } | |
3120 | |
3121 | |
3122 ///// | |
3123 // glibc on Bsd platform uses non-documented flag | |
3124 // to indicate, that some special sort of signal | |
3125 // trampoline is used. | |
3126 // We will never set this flag, and we should | |
3127 // ignore this flag in our diagnostic | |
3128 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3129 #undef SIGNIFICANT_SIGNAL_MASK | |
3130 #endif | |
3131 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3132 | |
3133 static const char* get_signal_handler_name(address handler, | |
3134 char* buf, int buflen) { | |
3135 int offset; | |
3136 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3137 if (found) { | |
3138 // skip directory names | |
3139 const char *p1, *p2; | |
3140 p1 = buf; | |
3141 size_t len = strlen(os::file_separator()); | |
3142 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3143 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3144 } else { | |
3145 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3146 } | |
3147 return buf; | |
3148 } | |
3149 | |
3150 static void print_signal_handler(outputStream* st, int sig, | |
3151 char* buf, size_t buflen) { | |
3152 struct sigaction sa; | |
3153 | |
3154 sigaction(sig, NULL, &sa); | |
3155 | |
3156 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3157 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3158 | |
3159 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3160 | |
3161 address handler = (sa.sa_flags & SA_SIGINFO) | |
3162 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3163 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3164 | |
3165 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3166 st->print("SIG_DFL"); | |
3167 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3168 st->print("SIG_IGN"); | |
3169 } else { | |
3170 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3171 } | |
3172 | |
3173 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
3174 | |
3175 address rh = VMError::get_resetted_sighandler(sig); | |
3176 // May be, handler was resetted by VMError? | |
3177 if(rh != NULL) { | |
3178 handler = rh; | |
3179 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3180 } | |
3181 | |
3182 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
3183 | |
3184 // Check: is it our handler? | |
3185 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3186 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3187 // It is our signal handler | |
3188 // check for flags, reset system-used one! | |
3189 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3190 st->print( | |
3191 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3192 os::Bsd::get_our_sigflags(sig)); | |
3193 } | |
3194 } | |
3195 st->cr(); | |
3196 } | |
3197 | |
3198 | |
3199 #define DO_SIGNAL_CHECK(sig) \ | |
3200 if (!sigismember(&check_signal_done, sig)) \ | |
3201 os::Bsd::check_signal_handler(sig) | |
3202 | |
3203 // This method is a periodic task to check for misbehaving JNI applications | |
3204 // under CheckJNI, we can add any periodic checks here | |
3205 | |
3206 void os::run_periodic_checks() { | |
3207 | |
3208 if (check_signals == false) return; | |
3209 | |
3210 // SEGV and BUS if overridden could potentially prevent | |
3211 // generation of hs*.log in the event of a crash, debugging | |
3212 // such a case can be very challenging, so we absolutely | |
3213 // check the following for a good measure: | |
3214 DO_SIGNAL_CHECK(SIGSEGV); | |
3215 DO_SIGNAL_CHECK(SIGILL); | |
3216 DO_SIGNAL_CHECK(SIGFPE); | |
3217 DO_SIGNAL_CHECK(SIGBUS); | |
3218 DO_SIGNAL_CHECK(SIGPIPE); | |
3219 DO_SIGNAL_CHECK(SIGXFSZ); | |
3220 | |
3221 | |
3222 // ReduceSignalUsage allows the user to override these handlers | |
3223 // see comments at the very top and jvm_solaris.h | |
3224 if (!ReduceSignalUsage) { | |
3225 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3226 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3227 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3228 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3229 } | |
3230 | |
3231 DO_SIGNAL_CHECK(SR_signum); | |
3232 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3233 } | |
3234 | |
3235 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3236 | |
3237 static os_sigaction_t os_sigaction = NULL; | |
3238 | |
3239 void os::Bsd::check_signal_handler(int sig) { | |
3240 char buf[O_BUFLEN]; | |
3241 address jvmHandler = NULL; | |
3242 | |
3243 | |
3244 struct sigaction act; | |
3245 if (os_sigaction == NULL) { | |
3246 // only trust the default sigaction, in case it has been interposed | |
3247 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3248 if (os_sigaction == NULL) return; | |
3249 } | |
3250 | |
3251 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3252 | |
3253 | |
3254 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3255 | |
3256 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3257 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3258 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3259 | |
3260 | |
3261 switch(sig) { | |
3262 case SIGSEGV: | |
3263 case SIGBUS: | |
3264 case SIGFPE: | |
3265 case SIGPIPE: | |
3266 case SIGILL: | |
3267 case SIGXFSZ: | |
3268 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3269 break; | |
3270 | |
3271 case SHUTDOWN1_SIGNAL: | |
3272 case SHUTDOWN2_SIGNAL: | |
3273 case SHUTDOWN3_SIGNAL: | |
3274 case BREAK_SIGNAL: | |
3275 jvmHandler = (address)user_handler(); | |
3276 break; | |
3277 | |
3278 case INTERRUPT_SIGNAL: | |
3279 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3280 break; | |
3281 | |
3282 default: | |
3283 if (sig == SR_signum) { | |
3284 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3285 } else { | |
3286 return; | |
3287 } | |
3288 break; | |
3289 } | |
3290 | |
3291 if (thisHandler != jvmHandler) { | |
3292 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3293 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3294 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3295 // No need to check this sig any longer | |
3296 sigaddset(&check_signal_done, sig); | |
3297 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3298 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3299 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
3300 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3301 // No need to check this sig any longer | |
3302 sigaddset(&check_signal_done, sig); | |
3303 } | |
3304 | |
3305 // Dump all the signal | |
3306 if (sigismember(&check_signal_done, sig)) { | |
3307 print_signal_handlers(tty, buf, O_BUFLEN); | |
3308 } | |
3309 } | |
3310 | |
3311 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3312 | |
3313 extern bool signal_name(int signo, char* buf, size_t len); | |
3314 | |
3315 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3316 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3317 // signal | |
3318 if (!signal_name(exception_code, buf, size)) { | |
3319 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3320 } | |
3321 return buf; | |
3322 } else { | |
3323 return NULL; | |
3324 } | |
3325 } | |
3326 | |
3327 // this is called _before_ the most of global arguments have been parsed | |
3328 void os::init(void) { | |
3329 char dummy; /* used to get a guess on initial stack address */ | |
3330 // first_hrtime = gethrtime(); | |
3331 | |
3332 // With BsdThreads the JavaMain thread pid (primordial thread) | |
3333 // is different than the pid of the java launcher thread. | |
3334 // So, on Bsd, the launcher thread pid is passed to the VM | |
3335 // via the sun.java.launcher.pid property. | |
3336 // Use this property instead of getpid() if it was correctly passed. | |
3337 // See bug 6351349. | |
3338 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3339 | |
3340 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3341 | |
3342 clock_tics_per_sec = CLK_TCK; | |
3343 | |
3344 init_random(1234567); | |
3345 | |
3346 ThreadCritical::initialize(); | |
3347 | |
3348 Bsd::set_page_size(getpagesize()); | |
3349 if (Bsd::page_size() == -1) { | |
3350 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
3351 strerror(errno))); | |
3352 } | |
3353 init_page_sizes((size_t) Bsd::page_size()); | |
3354 | |
3355 Bsd::initialize_system_info(); | |
3356 | |
3357 // main_thread points to the aboriginal thread | |
3358 Bsd::_main_thread = pthread_self(); | |
3359 | |
3360 Bsd::clock_init(); | |
3361 initial_time_count = os::elapsed_counter(); | |
3362 | |
3363 #ifdef __APPLE__ | |
3364 // XXXDARWIN | |
3365 // Work around the unaligned VM callbacks in hotspot's | |
3366 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
3367 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
3368 // alignment when doing symbol lookup. To work around this, we force early | |
3369 // binding of all symbols now, thus binding when alignment is known-good. | |
3370 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
3371 #endif | |
3372 } | |
3373 | |
3374 // To install functions for atexit system call | |
3375 extern "C" { | |
3376 static void perfMemory_exit_helper() { | |
3377 perfMemory_exit(); | |
3378 } | |
3379 } | |
3380 | |
3381 // this is called _after_ the global arguments have been parsed | |
3382 jint os::init_2(void) | |
3383 { | |
3384 // Allocate a single page and mark it as readable for safepoint polling | |
3385 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3386 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
3387 | |
3388 os::set_polling_page( polling_page ); | |
3389 | |
3390 #ifndef PRODUCT | |
3391 if(Verbose && PrintMiscellaneous) | |
3392 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
3393 #endif | |
3394 | |
3395 if (!UseMembar) { | |
3396 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3397 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
3398 os::set_memory_serialize_page( mem_serialize_page ); | |
3399 | |
3400 #ifndef PRODUCT | |
3401 if(Verbose && PrintMiscellaneous) | |
3402 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3403 #endif | |
3404 } | |
3405 | |
3406 os::large_page_init(); | |
3407 | |
3408 // initialize suspend/resume support - must do this before signal_sets_init() | |
3409 if (SR_initialize() != 0) { | |
3410 perror("SR_initialize failed"); | |
3411 return JNI_ERR; | |
3412 } | |
3413 | |
3414 Bsd::signal_sets_init(); | |
3415 Bsd::install_signal_handlers(); | |
3416 | |
3417 // Check minimum allowable stack size for thread creation and to initialize | |
3418 // the java system classes, including StackOverflowError - depends on page | |
3419 // size. Add a page for compiler2 recursion in main thread. | |
3420 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3421 // class initialization depending on 32 or 64 bit VM. | |
3422 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
3423 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
3424 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
3425 | |
3426 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3427 if (threadStackSizeInBytes != 0 && | |
3428 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
3429 tty->print_cr("\nThe stack size specified is too small, " | |
3430 "Specify at least %dk", | |
3431 os::Bsd::min_stack_allowed/ K); | |
3432 return JNI_ERR; | |
3433 } | |
3434 | |
3435 // Make the stack size a multiple of the page size so that | |
3436 // the yellow/red zones can be guarded. | |
3437 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
3438 vm_page_size())); | |
3439 | |
3440 if (MaxFDLimit) { | |
3441 // set the number of file descriptors to max. print out error | |
3442 // if getrlimit/setrlimit fails but continue regardless. | |
3443 struct rlimit nbr_files; | |
3444 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3445 if (status != 0) { | |
3446 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3447 perror("os::init_2 getrlimit failed"); | |
3448 } else { | |
3449 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3450 | |
3451 #ifdef __APPLE__ | |
3452 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
3453 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
3454 // be used instead | |
3455 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
3456 #endif | |
3457 | |
3458 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3459 if (status != 0) { | |
3460 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3461 perror("os::init_2 setrlimit failed"); | |
3462 } | |
3463 } | |
3464 } | |
3465 | |
3466 // at-exit methods are called in the reverse order of their registration. | |
3467 // atexit functions are called on return from main or as a result of a | |
3468 // call to exit(3C). There can be only 32 of these functions registered | |
3469 // and atexit() does not set errno. | |
3470 | |
3471 if (PerfAllowAtExitRegistration) { | |
3472 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3473 // atexit functions can be delayed until process exit time, which | |
3474 // can be problematic for embedded VM situations. Embedded VMs should | |
3475 // call DestroyJavaVM() to assure that VM resources are released. | |
3476 | |
3477 // note: perfMemory_exit_helper atexit function may be removed in | |
3478 // the future if the appropriate cleanup code can be added to the | |
3479 // VM_Exit VMOperation's doit method. | |
3480 if (atexit(perfMemory_exit_helper) != 0) { | |
3481 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
3482 } | |
3483 } | |
3484 | |
3485 // initialize thread priority policy | |
3486 prio_init(); | |
3487 | |
4006 | 3488 #ifdef __APPLE__ |
3489 // dynamically link to objective c gc registration | |
3490 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
3491 if (handleLibObjc != NULL) { | |
3492 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
3493 } | |
3494 #endif | |
3495 | |
3960 | 3496 return JNI_OK; |
3497 } | |
3498 | |
3499 // this is called at the end of vm_initialization | |
3500 void os::init_3(void) { } | |
3501 | |
3502 // Mark the polling page as unreadable | |
3503 void os::make_polling_page_unreadable(void) { | |
3504 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
3505 fatal("Could not disable polling page"); | |
3506 }; | |
3507 | |
3508 // Mark the polling page as readable | |
3509 void os::make_polling_page_readable(void) { | |
3510 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
3511 fatal("Could not enable polling page"); | |
3512 } | |
3513 }; | |
3514 | |
3515 int os::active_processor_count() { | |
3516 return _processor_count; | |
3517 } | |
3518 | |
4006 | 3519 void os::set_native_thread_name(const char *name) { |
3520 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
3521 // This is only supported in Snow Leopard and beyond | |
3522 if (name != NULL) { | |
3523 // Add a "Java: " prefix to the name | |
3524 char buf[MAXTHREADNAMESIZE]; | |
3525 snprintf(buf, sizeof(buf), "Java: %s", name); | |
3526 pthread_setname_np(buf); | |
3527 } | |
3528 #endif | |
3529 } | |
3530 | |
3960 | 3531 bool os::distribute_processes(uint length, uint* distribution) { |
3532 // Not yet implemented. | |
3533 return false; | |
3534 } | |
3535 | |
3536 bool os::bind_to_processor(uint processor_id) { | |
3537 // Not yet implemented. | |
3538 return false; | |
3539 } | |
3540 | |
3541 /// | |
3542 | |
3543 // Suspends the target using the signal mechanism and then grabs the PC before | |
3544 // resuming the target. Used by the flat-profiler only | |
3545 ExtendedPC os::get_thread_pc(Thread* thread) { | |
3546 // Make sure that it is called by the watcher for the VMThread | |
3547 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
3548 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
3549 | |
3550 ExtendedPC epc; | |
3551 | |
3552 OSThread* osthread = thread->osthread(); | |
3553 if (do_suspend(osthread)) { | |
3554 if (osthread->ucontext() != NULL) { | |
3555 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); | |
3556 } else { | |
3557 // NULL context is unexpected, double-check this is the VMThread | |
3558 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
3559 } | |
3560 do_resume(osthread); | |
3561 } | |
3562 // failure means pthread_kill failed for some reason - arguably this is | |
3563 // a fatal problem, but such problems are ignored elsewhere | |
3564 | |
3565 return epc; | |
3566 } | |
3567 | |
3568 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
3569 { | |
3570 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
3571 } | |
3572 | |
3573 //////////////////////////////////////////////////////////////////////////////// | |
3574 // debug support | |
3575 | |
3576 bool os::find(address addr, outputStream* st) { | |
3577 Dl_info dlinfo; | |
3578 memset(&dlinfo, 0, sizeof(dlinfo)); | |
3579 if (dladdr(addr, &dlinfo)) { | |
3580 st->print(PTR_FORMAT ": ", addr); | |
3581 if (dlinfo.dli_sname != NULL) { | |
3582 st->print("%s+%#x", dlinfo.dli_sname, | |
3583 addr - (intptr_t)dlinfo.dli_saddr); | |
3584 } else if (dlinfo.dli_fname) { | |
3585 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
3586 } else { | |
3587 st->print("<absolute address>"); | |
3588 } | |
3589 if (dlinfo.dli_fname) { | |
3590 st->print(" in %s", dlinfo.dli_fname); | |
3591 } | |
3592 if (dlinfo.dli_fbase) { | |
3593 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
3594 } | |
3595 st->cr(); | |
3596 | |
3597 if (Verbose) { | |
3598 // decode some bytes around the PC | |
9060
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8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
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changeset
|
3599 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
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diff
changeset
|
3600 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
3960 | 3601 address lowest = (address) dlinfo.dli_sname; |
3602 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
3603 if (begin < lowest) begin = lowest; | |
3604 Dl_info dlinfo2; | |
3605 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
3606 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
3607 end = (address) dlinfo2.dli_saddr; | |
3608 Disassembler::decode(begin, end, st); | |
3609 } | |
3610 return true; | |
3611 } | |
3612 return false; | |
3613 } | |
3614 | |
3615 //////////////////////////////////////////////////////////////////////////////// | |
3616 // misc | |
3617 | |
3618 // This does not do anything on Bsd. This is basically a hook for being | |
3619 // able to use structured exception handling (thread-local exception filters) | |
3620 // on, e.g., Win32. | |
3621 void | |
3622 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
3623 JavaCallArguments* args, Thread* thread) { | |
3624 f(value, method, args, thread); | |
3625 } | |
3626 | |
3627 void os::print_statistics() { | |
3628 } | |
3629 | |
3630 int os::message_box(const char* title, const char* message) { | |
3631 int i; | |
3632 fdStream err(defaultStream::error_fd()); | |
3633 for (i = 0; i < 78; i++) err.print_raw("="); | |
3634 err.cr(); | |
3635 err.print_raw_cr(title); | |
3636 for (i = 0; i < 78; i++) err.print_raw("-"); | |
3637 err.cr(); | |
3638 err.print_raw_cr(message); | |
3639 for (i = 0; i < 78; i++) err.print_raw("="); | |
3640 err.cr(); | |
3641 | |
3642 char buf[16]; | |
3643 // Prevent process from exiting upon "read error" without consuming all CPU | |
3644 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
3645 | |
3646 return buf[0] == 'y' || buf[0] == 'Y'; | |
3647 } | |
3648 | |
3649 int os::stat(const char *path, struct stat *sbuf) { | |
3650 char pathbuf[MAX_PATH]; | |
3651 if (strlen(path) > MAX_PATH - 1) { | |
3652 errno = ENAMETOOLONG; | |
3653 return -1; | |
3654 } | |
3655 os::native_path(strcpy(pathbuf, path)); | |
3656 return ::stat(pathbuf, sbuf); | |
3657 } | |
3658 | |
3659 bool os::check_heap(bool force) { | |
3660 return true; | |
3661 } | |
3662 | |
3663 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
3664 return ::vsnprintf(buf, count, format, args); | |
3665 } | |
3666 | |
3667 // Is a (classpath) directory empty? | |
3668 bool os::dir_is_empty(const char* path) { | |
3669 DIR *dir = NULL; | |
3670 struct dirent *ptr; | |
3671 | |
3672 dir = opendir(path); | |
3673 if (dir == NULL) return true; | |
3674 | |
3675 /* Scan the directory */ | |
3676 bool result = true; | |
3677 char buf[sizeof(struct dirent) + MAX_PATH]; | |
3678 while (result && (ptr = ::readdir(dir)) != NULL) { | |
3679 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
3680 result = false; | |
3681 } | |
3682 } | |
3683 closedir(dir); | |
3684 return result; | |
3685 } | |
3686 | |
3687 // This code originates from JDK's sysOpen and open64_w | |
3688 // from src/solaris/hpi/src/system_md.c | |
3689 | |
3690 #ifndef O_DELETE | |
3691 #define O_DELETE 0x10000 | |
3692 #endif | |
3693 | |
3694 // Open a file. Unlink the file immediately after open returns | |
3695 // if the specified oflag has the O_DELETE flag set. | |
3696 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
3697 | |
3698 int os::open(const char *path, int oflag, int mode) { | |
3699 | |
3700 if (strlen(path) > MAX_PATH - 1) { | |
3701 errno = ENAMETOOLONG; | |
3702 return -1; | |
3703 } | |
3704 int fd; | |
3705 int o_delete = (oflag & O_DELETE); | |
3706 oflag = oflag & ~O_DELETE; | |
3707 | |
3708 fd = ::open(path, oflag, mode); | |
3709 if (fd == -1) return -1; | |
3710 | |
3711 //If the open succeeded, the file might still be a directory | |
3712 { | |
3713 struct stat buf; | |
3714 int ret = ::fstat(fd, &buf); | |
3715 int st_mode = buf.st_mode; | |
3716 | |
3717 if (ret != -1) { | |
3718 if ((st_mode & S_IFMT) == S_IFDIR) { | |
3719 errno = EISDIR; | |
3720 ::close(fd); | |
3721 return -1; | |
3722 } | |
3723 } else { | |
3724 ::close(fd); | |
3725 return -1; | |
3726 } | |
3727 } | |
3728 | |
3729 /* | |
3730 * All file descriptors that are opened in the JVM and not | |
3731 * specifically destined for a subprocess should have the | |
3732 * close-on-exec flag set. If we don't set it, then careless 3rd | |
3733 * party native code might fork and exec without closing all | |
3734 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
3735 * UNIXProcess.c), and this in turn might: | |
3736 * | |
3737 * - cause end-of-file to fail to be detected on some file | |
3738 * descriptors, resulting in mysterious hangs, or | |
3739 * | |
3740 * - might cause an fopen in the subprocess to fail on a system | |
3741 * suffering from bug 1085341. | |
3742 * | |
3743 * (Yes, the default setting of the close-on-exec flag is a Unix | |
3744 * design flaw) | |
3745 * | |
3746 * See: | |
3747 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
3748 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
3749 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
3750 */ | |
3751 #ifdef FD_CLOEXEC | |
3752 { | |
3753 int flags = ::fcntl(fd, F_GETFD); | |
3754 if (flags != -1) | |
3755 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
3756 } | |
3757 #endif | |
3758 | |
3759 if (o_delete != 0) { | |
3760 ::unlink(path); | |
3761 } | |
3762 return fd; | |
3763 } | |
3764 | |
3765 | |
3766 // create binary file, rewriting existing file if required | |
3767 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
3768 int oflags = O_WRONLY | O_CREAT; | |
3769 if (!rewrite_existing) { | |
3770 oflags |= O_EXCL; | |
3771 } | |
3772 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
3773 } | |
3774 | |
3775 // return current position of file pointer | |
3776 jlong os::current_file_offset(int fd) { | |
3777 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
3778 } | |
3779 | |
3780 // move file pointer to the specified offset | |
3781 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
3782 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
3783 } | |
3784 | |
3785 // This code originates from JDK's sysAvailable | |
3786 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
3787 | |
3788 int os::available(int fd, jlong *bytes) { | |
3789 jlong cur, end; | |
3790 int mode; | |
3791 struct stat buf; | |
3792 | |
3793 if (::fstat(fd, &buf) >= 0) { | |
3794 mode = buf.st_mode; | |
3795 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
3796 /* | |
3797 * XXX: is the following call interruptible? If so, this might | |
3798 * need to go through the INTERRUPT_IO() wrapper as for other | |
3799 * blocking, interruptible calls in this file. | |
3800 */ | |
3801 int n; | |
3802 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
3803 *bytes = n; | |
3804 return 1; | |
3805 } | |
3806 } | |
3807 } | |
3808 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
3809 return 0; | |
3810 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
3811 return 0; | |
3812 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
3813 return 0; | |
3814 } | |
3815 *bytes = end - cur; | |
3816 return 1; | |
3817 } | |
3818 | |
3819 int os::socket_available(int fd, jint *pbytes) { | |
3820 if (fd < 0) | |
3821 return OS_OK; | |
3822 | |
3823 int ret; | |
3824 | |
3825 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
3826 | |
3827 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
3828 // is expected to return 0 on failure and 1 on success to the jdk. | |
3829 | |
3830 return (ret == OS_ERR) ? 0 : 1; | |
3831 } | |
3832 | |
3833 // Map a block of memory. | |
6197 | 3834 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 3835 char *addr, size_t bytes, bool read_only, |
3836 bool allow_exec) { | |
3837 int prot; | |
3838 int flags; | |
3839 | |
3840 if (read_only) { | |
3841 prot = PROT_READ; | |
3842 flags = MAP_SHARED; | |
3843 } else { | |
3844 prot = PROT_READ | PROT_WRITE; | |
3845 flags = MAP_PRIVATE; | |
3846 } | |
3847 | |
3848 if (allow_exec) { | |
3849 prot |= PROT_EXEC; | |
3850 } | |
3851 | |
3852 if (addr != NULL) { | |
3853 flags |= MAP_FIXED; | |
3854 } | |
3855 | |
3856 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
3857 fd, file_offset); | |
3858 if (mapped_address == MAP_FAILED) { | |
3859 return NULL; | |
3860 } | |
3861 return mapped_address; | |
3862 } | |
3863 | |
3864 | |
3865 // Remap a block of memory. | |
6197 | 3866 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 3867 char *addr, size_t bytes, bool read_only, |
3868 bool allow_exec) { | |
3869 // same as map_memory() on this OS | |
3870 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
3871 allow_exec); | |
3872 } | |
3873 | |
3874 | |
3875 // Unmap a block of memory. | |
6197 | 3876 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
3960 | 3877 return munmap(addr, bytes) == 0; |
3878 } | |
3879 | |
3880 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
3881 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
3882 // of a thread. | |
3883 // | |
3884 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
3885 // the fast estimate available on the platform. | |
3886 | |
3887 jlong os::current_thread_cpu_time() { | |
3888 #ifdef __APPLE__ | |
3889 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
8689
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3890 #else |
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3891 Unimplemented(); |
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3892 return 0; |
3960 | 3893 #endif |
3894 } | |
3895 | |
3896 jlong os::thread_cpu_time(Thread* thread) { | |
8689
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3897 #ifdef __APPLE__ |
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3898 return os::thread_cpu_time(thread, true /* user + sys */); |
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3899 #else |
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3900 Unimplemented(); |
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3901 return 0; |
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3902 #endif |
3960 | 3903 } |
3904 | |
3905 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
3906 #ifdef __APPLE__ | |
3907 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
8689
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3908 #else |
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3909 Unimplemented(); |
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3910 return 0; |
3960 | 3911 #endif |
3912 } | |
3913 | |
3914 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
3915 #ifdef __APPLE__ | |
3916 struct thread_basic_info tinfo; | |
3917 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
3918 kern_return_t kr; | |
4961
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3919 thread_t mach_thread; |
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3920 |
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3921 mach_thread = thread->osthread()->thread_id(); |
3960 | 3922 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
3923 if (kr != KERN_SUCCESS) | |
3924 return -1; | |
3925 | |
3926 if (user_sys_cpu_time) { | |
3927 jlong nanos; | |
3928 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
3929 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
3930 return nanos; | |
3931 } else { | |
3932 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
3933 } | |
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3934 #else |
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3935 Unimplemented(); |
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3936 return 0; |
3960 | 3937 #endif |
3938 } | |
3939 | |
3940 | |
3941 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
3942 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
3943 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
3944 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
3945 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
3946 } | |
3947 | |
3948 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
3949 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
3950 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
3951 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
3952 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
3953 } | |
3954 | |
3955 bool os::is_thread_cpu_time_supported() { | |
3956 #ifdef __APPLE__ | |
3957 return true; | |
6918 | 3958 #else |
3960 | 3959 return false; |
3960 #endif | |
3961 } | |
3962 | |
3963 // System loadavg support. Returns -1 if load average cannot be obtained. | |
3964 // Bsd doesn't yet have a (official) notion of processor sets, | |
3965 // so just return the system wide load average. | |
3966 int os::loadavg(double loadavg[], int nelem) { | |
3967 return ::getloadavg(loadavg, nelem); | |
3968 } | |
3969 | |
3970 void os::pause() { | |
3971 char filename[MAX_PATH]; | |
3972 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
3973 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
3974 } else { | |
3975 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
3976 } | |
3977 | |
3978 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
3979 if (fd != -1) { | |
3980 struct stat buf; | |
3981 ::close(fd); | |
3982 while (::stat(filename, &buf) == 0) { | |
3983 (void)::poll(NULL, 0, 100); | |
3984 } | |
3985 } else { | |
3986 jio_fprintf(stderr, | |
3987 "Could not open pause file '%s', continuing immediately.\n", filename); | |
3988 } | |
3989 } | |
3990 | |
3991 | |
3992 // Refer to the comments in os_solaris.cpp park-unpark. | |
3993 // | |
3994 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
3995 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
3996 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
3997 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
3998 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
3999 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4000 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4001 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4002 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4003 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4004 // of libpthread avoids the problem, but isn't practical. | |
4005 // | |
4006 // Possible remedies: | |
4007 // | |
4008 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4009 // This is palliative and probabilistic, however. If the thread is preempted | |
4010 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4011 // than the minimum period may have passed, and the abstime may be stale (in the | |
4012 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4013 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4014 // | |
4015 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4016 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4017 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4018 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4019 // thread. | |
4020 // | |
4021 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4022 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4023 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4024 // This also works well. In fact it avoids kernel-level scalability impediments | |
4025 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4026 // timers in a graceful fashion. | |
4027 // | |
4028 // 4. When the abstime value is in the past it appears that control returns | |
4029 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4030 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4031 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4032 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4033 // It may be possible to avoid reinitialization by checking the return | |
4034 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4035 // condvar we must establish the invariant that cond_signal() is only called | |
4036 // within critical sections protected by the adjunct mutex. This prevents | |
4037 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4038 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4039 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4040 // | |
4041 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4042 // structure when a condvar is used or initialized. cond_destroy() would | |
4043 // release the helper structure. Our reinitialize-after-timedwait fix | |
4044 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4045 // | |
4046 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4047 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4048 // and only enabling the work-around for vulnerable environments. | |
4049 | |
4050 // utility to compute the abstime argument to timedwait: | |
4051 // millis is the relative timeout time | |
4052 // abstime will be the absolute timeout time | |
4053 // TODO: replace compute_abstime() with unpackTime() | |
4054 | |
4055 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
4056 if (millis < 0) millis = 0; | |
4057 struct timeval now; | |
4058 int status = gettimeofday(&now, NULL); | |
4059 assert(status == 0, "gettimeofday"); | |
4060 jlong seconds = millis / 1000; | |
4061 millis %= 1000; | |
4062 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4063 seconds = 50000000; | |
4064 } | |
4065 abstime->tv_sec = now.tv_sec + seconds; | |
4066 long usec = now.tv_usec + millis * 1000; | |
4067 if (usec >= 1000000) { | |
4068 abstime->tv_sec += 1; | |
4069 usec -= 1000000; | |
4070 } | |
4071 abstime->tv_nsec = usec * 1000; | |
4072 return abstime; | |
4073 } | |
4074 | |
4075 | |
4076 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4077 // Conceptually TryPark() should be equivalent to park(0). | |
4078 | |
4079 int os::PlatformEvent::TryPark() { | |
4080 for (;;) { | |
4081 const int v = _Event ; | |
4082 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4083 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4084 } | |
4085 } | |
4086 | |
4087 void os::PlatformEvent::park() { // AKA "down()" | |
4088 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4089 // may call park(). | |
4090 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4091 int v ; | |
4092 for (;;) { | |
4093 v = _Event ; | |
4094 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4095 } | |
4096 guarantee (v >= 0, "invariant") ; | |
4097 if (v == 0) { | |
4098 // Do this the hard way by blocking ... | |
4099 int status = pthread_mutex_lock(_mutex); | |
4100 assert_status(status == 0, status, "mutex_lock"); | |
4101 guarantee (_nParked == 0, "invariant") ; | |
4102 ++ _nParked ; | |
4103 while (_Event < 0) { | |
4104 status = pthread_cond_wait(_cond, _mutex); | |
4105 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4106 // Treat this the same as if the wait was interrupted | |
4107 if (status == ETIMEDOUT) { status = EINTR; } | |
4108 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4109 } | |
4110 -- _nParked ; | |
4111 | |
4112 _Event = 0 ; | |
4113 status = pthread_mutex_unlock(_mutex); | |
4114 assert_status(status == 0, status, "mutex_unlock"); | |
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4115 // Paranoia to ensure our locked and lock-free paths interact |
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4116 // correctly with each other. |
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4117 OrderAccess::fence(); |
3960 | 4118 } |
4119 guarantee (_Event >= 0, "invariant") ; | |
4120 } | |
4121 | |
4122 int os::PlatformEvent::park(jlong millis) { | |
4123 guarantee (_nParked == 0, "invariant") ; | |
4124 | |
4125 int v ; | |
4126 for (;;) { | |
4127 v = _Event ; | |
4128 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4129 } | |
4130 guarantee (v >= 0, "invariant") ; | |
4131 if (v != 0) return OS_OK ; | |
4132 | |
4133 // We do this the hard way, by blocking the thread. | |
4134 // Consider enforcing a minimum timeout value. | |
4135 struct timespec abst; | |
4136 compute_abstime(&abst, millis); | |
4137 | |
4138 int ret = OS_TIMEOUT; | |
4139 int status = pthread_mutex_lock(_mutex); | |
4140 assert_status(status == 0, status, "mutex_lock"); | |
4141 guarantee (_nParked == 0, "invariant") ; | |
4142 ++_nParked ; | |
4143 | |
4144 // Object.wait(timo) will return because of | |
4145 // (a) notification | |
4146 // (b) timeout | |
4147 // (c) thread.interrupt | |
4148 // | |
4149 // Thread.interrupt and object.notify{All} both call Event::set. | |
4150 // That is, we treat thread.interrupt as a special case of notification. | |
4151 // The underlying Solaris implementation, cond_timedwait, admits | |
4152 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4153 // JVM from making those visible to Java code. As such, we must | |
4154 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4155 // | |
4156 // TODO: properly differentiate simultaneous notify+interrupt. | |
4157 // In that case, we should propagate the notify to another waiter. | |
4158 | |
4159 while (_Event < 0) { | |
4160 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
4161 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4162 pthread_cond_destroy (_cond); | |
4163 pthread_cond_init (_cond, NULL) ; | |
4164 } | |
4165 assert_status(status == 0 || status == EINTR || | |
4166 status == ETIMEDOUT, | |
4167 status, "cond_timedwait"); | |
4168 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4169 if (status == ETIMEDOUT) break ; | |
4170 // We consume and ignore EINTR and spurious wakeups. | |
4171 } | |
4172 --_nParked ; | |
4173 if (_Event >= 0) { | |
4174 ret = OS_OK; | |
4175 } | |
4176 _Event = 0 ; | |
4177 status = pthread_mutex_unlock(_mutex); | |
4178 assert_status(status == 0, status, "mutex_unlock"); | |
4179 assert (_nParked == 0, "invariant") ; | |
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4180 // Paranoia to ensure our locked and lock-free paths interact |
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4181 // correctly with each other. |
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4182 OrderAccess::fence(); |
3960 | 4183 return ret; |
4184 } | |
4185 | |
4186 void os::PlatformEvent::unpark() { | |
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4187 // Transitions for _Event: |
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4188 // 0 :=> 1 |
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4189 // 1 :=> 1 |
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4190 // -1 :=> either 0 or 1; must signal target thread |
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4191 // That is, we can safely transition _Event from -1 to either |
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4192 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4193 // unpark() calls. |
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4194 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4195 // |
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4196 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4197 // that it will take two back-to-back park() calls for the owning |
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4198 // thread to block. This has the benefit of forcing a spurious return |
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4199 // from the first park() call after an unpark() call which will help |
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4200 // shake out uses of park() and unpark() without condition variables. |
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4201 |
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4202 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4203 |
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4204 // Wait for the thread associated with the event to vacate |
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4205 int status = pthread_mutex_lock(_mutex); |
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4206 assert_status(status == 0, status, "mutex_lock"); |
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4207 int AnyWaiters = _nParked; |
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4208 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4209 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4210 AnyWaiters = 0; |
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4211 pthread_cond_signal(_cond); |
3960 | 4212 } |
7629
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4213 status = pthread_mutex_unlock(_mutex); |
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4214 assert_status(status == 0, status, "mutex_unlock"); |
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4215 if (AnyWaiters != 0) { |
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4216 status = pthread_cond_signal(_cond); |
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4217 assert_status(status == 0, status, "cond_signal"); |
3960 | 4218 } |
4219 | |
4220 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4221 // This is safe and avoids a common class of futile wakeups. In rare | |
4222 // circumstances this can cause a thread to return prematurely from | |
4223 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4224 // simply re-test the condition and re-park itself. | |
4225 } | |
4226 | |
4227 | |
4228 // JSR166 | |
4229 // ------------------------------------------------------- | |
4230 | |
4231 /* | |
4232 * The solaris and bsd implementations of park/unpark are fairly | |
4233 * conservative for now, but can be improved. They currently use a | |
4234 * mutex/condvar pair, plus a a count. | |
4235 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4236 * sets count to 1 and signals condvar. Only one thread ever waits | |
4237 * on the condvar. Contention seen when trying to park implies that someone | |
4238 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4239 * is no need to track notifications. | |
4240 */ | |
4241 | |
4242 #define MAX_SECS 100000000 | |
4243 /* | |
4244 * This code is common to bsd and solaris and will be moved to a | |
4245 * common place in dolphin. | |
4246 * | |
4247 * The passed in time value is either a relative time in nanoseconds | |
4248 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4249 * into suitable seconds and nanoseconds components and stored in the | |
4250 * given timespec structure. | |
4251 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4252 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
4253 * overflow if times way in the future are given. Further on Solaris versions | |
4254 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4255 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
4256 * As it will be 28 years before "now + 100000000" will overflow we can | |
4257 * ignore overflow and just impose a hard-limit on seconds using the value | |
4258 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4259 * years from "now". | |
4260 */ | |
4261 | |
4262 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
4263 assert (time > 0, "convertTime"); | |
4264 | |
4265 struct timeval now; | |
4266 int status = gettimeofday(&now, NULL); | |
4267 assert(status == 0, "gettimeofday"); | |
4268 | |
4269 time_t max_secs = now.tv_sec + MAX_SECS; | |
4270 | |
4271 if (isAbsolute) { | |
4272 jlong secs = time / 1000; | |
4273 if (secs > max_secs) { | |
4274 absTime->tv_sec = max_secs; | |
4275 } | |
4276 else { | |
4277 absTime->tv_sec = secs; | |
4278 } | |
4279 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4280 } | |
4281 else { | |
4282 jlong secs = time / NANOSECS_PER_SEC; | |
4283 if (secs >= MAX_SECS) { | |
4284 absTime->tv_sec = max_secs; | |
4285 absTime->tv_nsec = 0; | |
4286 } | |
4287 else { | |
4288 absTime->tv_sec = now.tv_sec + secs; | |
4289 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4290 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4291 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4292 ++absTime->tv_sec; // note: this must be <= max_secs | |
4293 } | |
4294 } | |
4295 } | |
4296 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4297 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4298 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4299 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4300 } | |
4301 | |
4302 void Parker::park(bool isAbsolute, jlong time) { | |
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4303 // Ideally we'd do something useful while spinning, such |
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4304 // as calling unpackTime(). |
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4305 |
3960 | 4306 // Optional fast-path check: |
4307 // Return immediately if a permit is available. | |
7629
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4308 // We depend on Atomic::xchg() having full barrier semantics |
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4309 // since we are doing a lock-free update to _counter. |
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4310 if (Atomic::xchg(0, &_counter) > 0) return; |
3960 | 4311 |
4312 Thread* thread = Thread::current(); | |
4313 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4314 JavaThread *jt = (JavaThread *)thread; | |
4315 | |
4316 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4317 // Check interrupt before trying to wait | |
4318 if (Thread::is_interrupted(thread, false)) { | |
4319 return; | |
4320 } | |
4321 | |
4322 // Next, demultiplex/decode time arguments | |
4323 struct timespec absTime; | |
4324 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
4325 return; | |
4326 } | |
4327 if (time > 0) { | |
4328 unpackTime(&absTime, isAbsolute, time); | |
4329 } | |
4330 | |
4331 | |
4332 // Enter safepoint region | |
4333 // Beware of deadlocks such as 6317397. | |
4334 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4335 // In particular a thread must never block on the Threads_lock while | |
4336 // holding the Parker:: mutex. If safepoints are pending both the | |
4337 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4338 ThreadBlockInVM tbivm(jt); | |
4339 | |
4340 // Don't wait if cannot get lock since interference arises from | |
4341 // unblocking. Also. check interrupt before trying wait | |
4342 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4343 return; | |
4344 } | |
4345 | |
4346 int status ; | |
4347 if (_counter > 0) { // no wait needed | |
4348 _counter = 0; | |
4349 status = pthread_mutex_unlock(_mutex); | |
4350 assert (status == 0, "invariant") ; | |
7629
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4351 // Paranoia to ensure our locked and lock-free paths interact |
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4352 // correctly with each other and Java-level accesses. |
3960 | 4353 OrderAccess::fence(); |
4354 return; | |
4355 } | |
4356 | |
4357 #ifdef ASSERT | |
4358 // Don't catch signals while blocked; let the running threads have the signals. | |
4359 // (This allows a debugger to break into the running thread.) | |
4360 sigset_t oldsigs; | |
4361 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
4362 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4363 #endif | |
4364 | |
4365 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
4366 jt->set_suspend_equivalent(); | |
4367 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
4368 | |
4369 if (time == 0) { | |
4370 status = pthread_cond_wait (_cond, _mutex) ; | |
4371 } else { | |
4372 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
4373 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4374 pthread_cond_destroy (_cond) ; | |
4375 pthread_cond_init (_cond, NULL); | |
4376 } | |
4377 } | |
4378 assert_status(status == 0 || status == EINTR || | |
4379 status == ETIMEDOUT, | |
4380 status, "cond_timedwait"); | |
4381 | |
4382 #ifdef ASSERT | |
4383 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
4384 #endif | |
4385 | |
4386 _counter = 0 ; | |
4387 status = pthread_mutex_unlock(_mutex) ; | |
4388 assert_status(status == 0, status, "invariant") ; | |
7629
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4389 // Paranoia to ensure our locked and lock-free paths interact |
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4390 // correctly with each other and Java-level accesses. |
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4391 OrderAccess::fence(); |
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4392 |
3960 | 4393 // If externally suspended while waiting, re-suspend |
4394 if (jt->handle_special_suspend_equivalent_condition()) { | |
4395 jt->java_suspend_self(); | |
4396 } | |
4397 } | |
4398 | |
4399 void Parker::unpark() { | |
4400 int s, status ; | |
4401 status = pthread_mutex_lock(_mutex); | |
4402 assert (status == 0, "invariant") ; | |
4403 s = _counter; | |
4404 _counter = 1; | |
4405 if (s < 1) { | |
4406 if (WorkAroundNPTLTimedWaitHang) { | |
4407 status = pthread_cond_signal (_cond) ; | |
4408 assert (status == 0, "invariant") ; | |
4409 status = pthread_mutex_unlock(_mutex); | |
4410 assert (status == 0, "invariant") ; | |
4411 } else { | |
4412 status = pthread_mutex_unlock(_mutex); | |
4413 assert (status == 0, "invariant") ; | |
4414 status = pthread_cond_signal (_cond) ; | |
4415 assert (status == 0, "invariant") ; | |
4416 } | |
4417 } else { | |
4418 pthread_mutex_unlock(_mutex); | |
4419 assert (status == 0, "invariant") ; | |
4420 } | |
4421 } | |
4422 | |
4423 | |
4424 /* Darwin has no "environ" in a dynamic library. */ | |
4425 #ifdef __APPLE__ | |
4426 #include <crt_externs.h> | |
4427 #define environ (*_NSGetEnviron()) | |
4428 #else | |
4429 extern char** environ; | |
4430 #endif | |
4431 | |
4432 // Run the specified command in a separate process. Return its exit value, | |
4433 // or -1 on failure (e.g. can't fork a new process). | |
4434 // Unlike system(), this function can be called from signal handler. It | |
4435 // doesn't block SIGINT et al. | |
4436 int os::fork_and_exec(char* cmd) { | |
4437 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
4438 | |
4439 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
4440 // pthread_atfork handlers and reset pthread library. All we need is a | |
4441 // separate process to execve. Make a direct syscall to fork process. | |
4442 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
4443 // the best... | |
4444 pid_t pid = fork(); | |
4445 | |
4446 if (pid < 0) { | |
4447 // fork failed | |
4448 return -1; | |
4449 | |
4450 } else if (pid == 0) { | |
4451 // child process | |
4452 | |
4453 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
4454 // first to kill every thread on the thread list. Because this list is | |
4455 // not reset by fork() (see notes above), execve() will instead kill | |
4456 // every thread in the parent process. We know this is the only thread | |
4457 // in the new process, so make a system call directly. | |
4458 // IA64 should use normal execve() from glibc to match the glibc fork() | |
4459 // above. | |
4460 execve("/bin/sh", (char* const*)argv, environ); | |
4461 | |
4462 // execve failed | |
4463 _exit(-1); | |
4464 | |
4465 } else { | |
4466 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
4467 // care about the actual exit code, for now. | |
4468 | |
4469 int status; | |
4470 | |
4471 // Wait for the child process to exit. This returns immediately if | |
4472 // the child has already exited. */ | |
4473 while (waitpid(pid, &status, 0) < 0) { | |
4474 switch (errno) { | |
4475 case ECHILD: return 0; | |
4476 case EINTR: break; | |
4477 default: return -1; | |
4478 } | |
4479 } | |
4480 | |
4481 if (WIFEXITED(status)) { | |
4482 // The child exited normally; get its exit code. | |
4483 return WEXITSTATUS(status); | |
4484 } else if (WIFSIGNALED(status)) { | |
4485 // The child exited because of a signal | |
4486 // The best value to return is 0x80 + signal number, | |
4487 // because that is what all Unix shells do, and because | |
4488 // it allows callers to distinguish between process exit and | |
4489 // process death by signal. | |
4490 return 0x80 + WTERMSIG(status); | |
4491 } else { | |
4492 // Unknown exit code; pass it through | |
4493 return status; | |
4494 } | |
4495 } | |
4496 } | |
4497 | |
4498 // is_headless_jre() | |
4499 // | |
4082
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4500 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
3960 | 4501 // in order to report if we are running in a headless jre |
4502 // | |
4082
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4503 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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4504 // as libawt.so, and renamed libawt_xawt.so |
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4505 // |
3960 | 4506 bool os::is_headless_jre() { |
4507 struct stat statbuf; | |
4508 char buf[MAXPATHLEN]; | |
4509 char libmawtpath[MAXPATHLEN]; | |
4006 | 4510 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
5921 | 4511 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
3960 | 4512 char *p; |
4513 | |
4514 // Get path to libjvm.so | |
4515 os::jvm_path(buf, sizeof(buf)); | |
4516 | |
4517 // Get rid of libjvm.so | |
4518 p = strrchr(buf, '/'); | |
4519 if (p == NULL) return false; | |
4520 else *p = '\0'; | |
4521 | |
4522 // Get rid of client or server | |
4523 p = strrchr(buf, '/'); | |
4524 if (p == NULL) return false; | |
4525 else *p = '\0'; | |
4526 | |
4527 // check xawt/libmawt.so | |
4528 strcpy(libmawtpath, buf); | |
4529 strcat(libmawtpath, xawtstr); | |
4530 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
4531 | |
4082
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4532 // check libawt_xawt.so |
3960 | 4533 strcpy(libmawtpath, buf); |
4082
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4534 strcat(libmawtpath, new_xawtstr); |
3960 | 4535 if (::stat(libmawtpath, &statbuf) == 0) return false; |
4536 | |
4537 return true; | |
4538 } | |
6200
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4539 |
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4540 // Get the default path to the core file |
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4541 // Returns the length of the string |
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4542 int os::get_core_path(char* buffer, size_t bufferSize) { |
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4543 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
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4544 |
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|
4545 // Truncate if theoretical string was longer than bufferSize |
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|
4546 n = MIN2(n, (int)bufferSize); |
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|
4547 |
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|
4548 return n; |
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|
4549 } |