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