1 /*
2 * Copyright (c) 1999, 2013, 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 ////////////////////////////////////////////////////////////////////////////////
170 // environment support
171
172 bool os::getenv(const char* name, char* buf, int len) {
173 const char* val = ::getenv(name);
174 if (val != NULL && strlen(val) < (size_t)len) {
175 strcpy(buf, val);
176 return true;
177 }
178 if (len > 0) buf[0] = 0; // return a null string
179 return false;
180 }
181
182
183 // Return true if user is running as root.
184
185 bool os::have_special_privileges() {
186 static bool init = false;
187 static bool privileges = false;
188 if (!init) {
189 privileges = (getuid() != geteuid()) || (getgid() != getegid());
190 init = true;
191 }
192 return privileges;
193 }
194
195
196
197 // Cpu architecture string
198 #if defined(ZERO)
199 static char cpu_arch[] = ZERO_LIBARCH;
200 #elif defined(IA64)
201 static char cpu_arch[] = "ia64";
202 #elif defined(IA32)
203 static char cpu_arch[] = "i386";
204 #elif defined(AMD64)
205 static char cpu_arch[] = "amd64";
206 #elif defined(ARM)
207 static char cpu_arch[] = "arm";
208 #elif defined(PPC)
209 static char cpu_arch[] = "ppc";
210 #elif defined(SPARC)
211 # ifdef _LP64
212 static char cpu_arch[] = "sparcv9";
213 # else
214 static char cpu_arch[] = "sparc";
215 # endif
216 #else
217 #error Add appropriate cpu_arch setting
218 #endif
219
220 // Compiler variant
221 #ifdef COMPILER2
222 #define COMPILER_VARIANT "server"
223 #else
224 #define COMPILER_VARIANT "client"
225 #endif
226
227
228 void os::Bsd::initialize_system_info() {
229 int mib[2];
230 size_t len;
231 int cpu_val;
232 julong mem_val;
233
234 /* get processors count via hw.ncpus sysctl */
235 mib[0] = CTL_HW;
236 mib[1] = HW_NCPU;
237 len = sizeof(cpu_val);
238 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
239 assert(len == sizeof(cpu_val), "unexpected data size");
240 set_processor_count(cpu_val);
241 }
242 else {
243 set_processor_count(1); // fallback
244 }
245
246 /* get physical memory via hw.memsize sysctl (hw.memsize is used
247 * since it returns a 64 bit value)
248 */
249 mib[0] = CTL_HW;
250 mib[1] = HW_MEMSIZE;
251 len = sizeof(mem_val);
252 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
253 assert(len == sizeof(mem_val), "unexpected data size");
254 _physical_memory = mem_val;
255 } else {
256 _physical_memory = 256*1024*1024; // fallback (XXXBSD?)
257 }
258
259 #ifdef __OpenBSD__
260 {
261 // limit _physical_memory memory view on OpenBSD since
262 // datasize rlimit restricts us anyway.
263 struct rlimit limits;
264 getrlimit(RLIMIT_DATA, &limits);
265 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
266 }
267 #endif
268 }
269
270 #ifdef __APPLE__
271 static const char *get_home() {
272 const char *home_dir = ::getenv("HOME");
273 if ((home_dir == NULL) || (*home_dir == '\0')) {
274 struct passwd *passwd_info = getpwuid(geteuid());
275 if (passwd_info != NULL) {
276 home_dir = passwd_info->pw_dir;
277 }
278 }
279
280 return home_dir;
281 }
282 #endif
283
284 void os::init_system_properties_values() {
285 // char arch[12];
286 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
287
288 // The next steps are taken in the product version:
289 //
290 // Obtain the JAVA_HOME value from the location of libjvm.so.
291 // This library should be located at:
292 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
293 //
294 // If "/jre/lib/" appears at the right place in the path, then we
295 // assume libjvm.so is installed in a JDK and we use this path.
296 //
297 // Otherwise exit with message: "Could not create the Java virtual machine."
298 //
299 // The following extra steps are taken in the debugging version:
300 //
301 // If "/jre/lib/" does NOT appear at the right place in the path
302 // instead of exit check for $JAVA_HOME environment variable.
303 //
304 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
305 // then we append a fake suffix "hotspot/libjvm.so" to this path so
306 // it looks like libjvm.so is installed there
307 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
308 //
309 // Otherwise exit.
310 //
311 // Important note: if the location of libjvm.so changes this
312 // code needs to be changed accordingly.
313
314 // The next few definitions allow the code to be verbatim:
315 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
316 #define getenv(n) ::getenv(n)
317
318 /*
319 * See ld(1):
320 * The linker uses the following search paths to locate required
321 * shared libraries:
322 * 1: ...
323 * ...
324 * 7: The default directories, normally /lib and /usr/lib.
325 */
326 #ifndef DEFAULT_LIBPATH
327 #define DEFAULT_LIBPATH "/lib:/usr/lib"
328 #endif
329
330 #define EXTENSIONS_DIR "/lib/ext"
331 #define ENDORSED_DIR "/lib/endorsed"
332 #define REG_DIR "/usr/java/packages"
333
334 #ifdef __APPLE__
335 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
336 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
337 const char *user_home_dir = get_home();
338 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir
339 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
340 sizeof(SYS_EXTENSIONS_DIRS);
341 #endif
342
343 {
344 /* sysclasspath, java_home, dll_dir */
345 {
346 char *home_path;
347 char *dll_path;
348 char *pslash;
349 char buf[MAXPATHLEN];
350 os::jvm_path(buf, sizeof(buf));
351
352 // Found the full path to libjvm.so.
353 // Now cut the path to <java_home>/jre if we can.
354 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
355 pslash = strrchr(buf, '/');
356 if (pslash != NULL)
357 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
358 dll_path = malloc(strlen(buf) + 1);
359 if (dll_path == NULL)
360 return;
361 strcpy(dll_path, buf);
362 Arguments::set_dll_dir(dll_path);
363
364 if (pslash != NULL) {
365 pslash = strrchr(buf, '/');
366 if (pslash != NULL) {
367 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */
368 #ifndef __APPLE__
369 pslash = strrchr(buf, '/');
370 if (pslash != NULL)
371 *pslash = '\0'; /* get rid of /lib */
372 #endif
373 }
374 }
375
376 home_path = malloc(strlen(buf) + 1);
377 if (home_path == NULL)
378 return;
379 strcpy(home_path, buf);
380 Arguments::set_java_home(home_path);
381
382 if (!set_boot_path('/', ':'))
383 return;
384 }
385
386 /*
387 * Where to look for native libraries
388 *
389 * Note: Due to a legacy implementation, most of the library path
390 * is set in the launcher. This was to accomodate linking restrictions
391 * on legacy Bsd implementations (which are no longer supported).
392 * Eventually, all the library path setting will be done here.
393 *
394 * However, to prevent the proliferation of improperly built native
395 * libraries, the new path component /usr/java/packages is added here.
396 * Eventually, all the library path setting will be done here.
397 */
398 {
399 char *ld_library_path;
400
401 /*
402 * Construct the invariant part of ld_library_path. Note that the
403 * space for the colon and the trailing null are provided by the
404 * nulls included by the sizeof operator (so actually we allocate
405 * a byte more than necessary).
406 */
407 #ifdef __APPLE__
408 ld_library_path = (char *) malloc(system_ext_size);
409 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);
410 #else
411 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
412 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
413 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
414 #endif
415
416 /*
417 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It
418 * should always exist (until the legacy problem cited above is
419 * addressed).
420 */
421 #ifdef __APPLE__
422 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper
423 char *l = getenv("JAVA_LIBRARY_PATH");
424 if (l != NULL) {
425 char *t = ld_library_path;
426 /* That's +1 for the colon and +1 for the trailing '\0' */
427 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);
428 sprintf(ld_library_path, "%s:%s", l, t);
429 free(t);
430 }
431
432 char *v = getenv("DYLD_LIBRARY_PATH");
433 #else
434 char *v = getenv("LD_LIBRARY_PATH");
435 #endif
436 if (v != NULL) {
437 char *t = ld_library_path;
438 /* That's +1 for the colon and +1 for the trailing '\0' */
439 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
440 sprintf(ld_library_path, "%s:%s", v, t);
441 free(t);
442 }
443
444 #ifdef __APPLE__
445 // Apple's Java6 has "." at the beginning of java.library.path.
446 // OpenJDK on Windows has "." at the end of java.library.path.
447 // OpenJDK on Linux and Solaris don't have "." in java.library.path
448 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
449 // "." is appended to the end of java.library.path. Yes, this
450 // could cause a change in behavior, but Apple's Java6 behavior
451 // can be achieved by putting "." at the beginning of the
452 // JAVA_LIBRARY_PATH environment variable.
453 {
454 char *t = ld_library_path;
455 // that's +3 for appending ":." and the trailing '\0'
456 ld_library_path = (char *) malloc(strlen(t) + 3);
457 sprintf(ld_library_path, "%s:%s", t, ".");
458 free(t);
459 }
460 #endif
461
462 Arguments::set_library_path(ld_library_path);
463 }
464
465 /*
466 * Extensions directories.
467 *
468 * Note that the space for the colon and the trailing null are provided
469 * by the nulls included by the sizeof operator (so actually one byte more
470 * than necessary is allocated).
471 */
472 {
473 #ifdef __APPLE__
474 char *buf = malloc(strlen(Arguments::get_java_home()) +
475 sizeof(EXTENSIONS_DIR) + system_ext_size);
476 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"
477 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());
478 #else
479 char *buf = malloc(strlen(Arguments::get_java_home()) +
480 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
481 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
482 Arguments::get_java_home());
483 #endif
484
485 Arguments::set_ext_dirs(buf);
486 }
487
488 /* Endorsed standards default directory. */
489 {
490 char * buf;
491 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
492 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
493 Arguments::set_endorsed_dirs(buf);
494 }
495 }
496
497 #ifdef __APPLE__
498 #undef SYS_EXTENSIONS_DIR
499 #endif
500 #undef malloc
501 #undef getenv
502 #undef EXTENSIONS_DIR
503 #undef ENDORSED_DIR
504
505 // Done
506 return;
507 }
508
509 ////////////////////////////////////////////////////////////////////////////////
510 // breakpoint support
511
512 void os::breakpoint() {
513 BREAKPOINT;
514 }
515
516 extern "C" void breakpoint() {
517 // use debugger to set breakpoint here
518 }
519
520 ////////////////////////////////////////////////////////////////////////////////
521 // signal support
522
523 debug_only(static bool signal_sets_initialized = false);
524 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
525
526 bool os::Bsd::is_sig_ignored(int sig) {
527 struct sigaction oact;
528 sigaction(sig, (struct sigaction*)NULL, &oact);
529 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
530 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
531 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
532 return true;
533 else
534 return false;
535 }
536
537 void os::Bsd::signal_sets_init() {
538 // Should also have an assertion stating we are still single-threaded.
539 assert(!signal_sets_initialized, "Already initialized");
540 // Fill in signals that are necessarily unblocked for all threads in
541 // the VM. Currently, we unblock the following signals:
542 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
543 // by -Xrs (=ReduceSignalUsage));
544 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
545 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
546 // the dispositions or masks wrt these signals.
547 // Programs embedding the VM that want to use the above signals for their
548 // own purposes must, at this time, use the "-Xrs" option to prevent
549 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
550 // (See bug 4345157, and other related bugs).
551 // In reality, though, unblocking these signals is really a nop, since
552 // these signals are not blocked by default.
553 sigemptyset(&unblocked_sigs);
554 sigemptyset(&allowdebug_blocked_sigs);
555 sigaddset(&unblocked_sigs, SIGILL);
556 sigaddset(&unblocked_sigs, SIGSEGV);
557 sigaddset(&unblocked_sigs, SIGBUS);
558 sigaddset(&unblocked_sigs, SIGFPE);
559 sigaddset(&unblocked_sigs, SR_signum);
560
561 if (!ReduceSignalUsage) {
562 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
563 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
564 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
565 }
566 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
567 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
568 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
569 }
570 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
571 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
572 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
573 }
574 }
575 // Fill in signals that are blocked by all but the VM thread.
576 sigemptyset(&vm_sigs);
577 if (!ReduceSignalUsage)
578 sigaddset(&vm_sigs, BREAK_SIGNAL);
579 debug_only(signal_sets_initialized = true);
580
581 }
582
583 // These are signals that are unblocked while a thread is running Java.
584 // (For some reason, they get blocked by default.)
585 sigset_t* os::Bsd::unblocked_signals() {
586 assert(signal_sets_initialized, "Not initialized");
587 return &unblocked_sigs;
588 }
589
590 // These are the signals that are blocked while a (non-VM) thread is
591 // running Java. Only the VM thread handles these signals.
592 sigset_t* os::Bsd::vm_signals() {
593 assert(signal_sets_initialized, "Not initialized");
594 return &vm_sigs;
595 }
596
597 // These are signals that are blocked during cond_wait to allow debugger in
598 sigset_t* os::Bsd::allowdebug_blocked_signals() {
599 assert(signal_sets_initialized, "Not initialized");
600 return &allowdebug_blocked_sigs;
601 }
602
603 void os::Bsd::hotspot_sigmask(Thread* thread) {
604
605 //Save caller's signal mask before setting VM signal mask
606 sigset_t caller_sigmask;
607 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
608
609 OSThread* osthread = thread->osthread();
610 osthread->set_caller_sigmask(caller_sigmask);
611
612 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
613
614 if (!ReduceSignalUsage) {
615 if (thread->is_VM_thread()) {
616 // Only the VM thread handles BREAK_SIGNAL ...
617 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
618 } else {
619 // ... all other threads block BREAK_SIGNAL
620 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
621 }
622 }
623 }
624
625
626 //////////////////////////////////////////////////////////////////////////////
627 // create new thread
628
629 static address highest_vm_reserved_address();
630
631 // check if it's safe to start a new thread
632 static bool _thread_safety_check(Thread* thread) {
633 return true;
634 }
635
636 #ifdef __APPLE__
637 // library handle for calling objc_registerThreadWithCollector()
638 // without static linking to the libobjc library
639 #define OBJC_LIB "/usr/lib/libobjc.dylib"
640 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
641 typedef void (*objc_registerThreadWithCollector_t)();
642 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
643 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
644 #endif
645
646 #ifdef __APPLE__
647 static uint64_t locate_unique_thread_id() {
648 // Additional thread_id used to correlate threads in SA
649 thread_identifier_info_data_t m_ident_info;
650 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
651
652 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO,
653 (thread_info_t) &m_ident_info, &count);
654 return m_ident_info.thread_id;
655 }
656 #endif
657
658 // Thread start routine for all newly created threads
659 static void *java_start(Thread *thread) {
660 // Try to randomize the cache line index of hot stack frames.
661 // This helps when threads of the same stack traces evict each other's
662 // cache lines. The threads can be either from the same JVM instance, or
663 // from different JVM instances. The benefit is especially true for
664 // processors with hyperthreading technology.
665 static int counter = 0;
666 int pid = os::current_process_id();
667 alloca(((pid ^ counter++) & 7) * 128);
668
669 ThreadLocalStorage::set_thread(thread);
670
671 OSThread* osthread = thread->osthread();
672 Monitor* sync = osthread->startThread_lock();
673
674 // non floating stack BsdThreads needs extra check, see above
675 if (!_thread_safety_check(thread)) {
676 // notify parent thread
677 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
678 osthread->set_state(ZOMBIE);
679 sync->notify_all();
680 return NULL;
681 }
682
683 #ifdef __APPLE__
684 // thread_id is mach thread on macos
685 osthread->set_thread_id(::mach_thread_self());
686 osthread->set_unique_thread_id(locate_unique_thread_id());
687 #else
688 // thread_id is pthread_id on BSD
689 osthread->set_thread_id(::pthread_self());
690 #endif
691 // initialize signal mask for this thread
692 os::Bsd::hotspot_sigmask(thread);
693
694 // initialize floating point control register
695 os::Bsd::init_thread_fpu_state();
696
697 #ifdef __APPLE__
698 // register thread with objc gc
699 if (objc_registerThreadWithCollectorFunction != NULL) {
700 objc_registerThreadWithCollectorFunction();
701 }
702 #endif
703
704 // handshaking with parent thread
705 {
706 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
707
708 // notify parent thread
709 osthread->set_state(INITIALIZED);
710 sync->notify_all();
711
712 // wait until os::start_thread()
713 while (osthread->get_state() == INITIALIZED) {
714 sync->wait(Mutex::_no_safepoint_check_flag);
715 }
716 }
717
718 // call one more level start routine
719 thread->run();
720
721 return 0;
722 }
723
724 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
725 assert(thread->osthread() == NULL, "caller responsible");
726
727 // Allocate the OSThread object
728 OSThread* osthread = new OSThread(NULL, NULL);
729 if (osthread == NULL) {
730 return false;
731 }
732
733 // set the correct thread state
734 osthread->set_thread_type(thr_type);
735
736 // Initial state is ALLOCATED but not INITIALIZED
737 osthread->set_state(ALLOCATED);
738
739 thread->set_osthread(osthread);
740
741 // init thread attributes
742 pthread_attr_t attr;
743 pthread_attr_init(&attr);
744 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
745
746 // stack size
747 if (os::Bsd::supports_variable_stack_size()) {
748 // calculate stack size if it's not specified by caller
749 if (stack_size == 0) {
750 stack_size = os::Bsd::default_stack_size(thr_type);
751
752 switch (thr_type) {
753 case os::java_thread:
754 // Java threads use ThreadStackSize which default value can be
755 // changed with the flag -Xss
756 assert (JavaThread::stack_size_at_create() > 0, "this should be set");
757 stack_size = JavaThread::stack_size_at_create();
758 break;
759 case os::compiler_thread:
760 if (CompilerThreadStackSize > 0) {
761 stack_size = (size_t)(CompilerThreadStackSize * K);
762 break;
763 } // else fall through:
764 // use VMThreadStackSize if CompilerThreadStackSize is not defined
765 case os::vm_thread:
766 case os::pgc_thread:
767 case os::cgc_thread:
768 case os::watcher_thread:
769 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
770 break;
771 }
772 }
773
774 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
775 pthread_attr_setstacksize(&attr, stack_size);
776 } else {
777 // let pthread_create() pick the default value.
778 }
779
780 ThreadState state;
781
782 {
783 pthread_t tid;
784 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
785
786 pthread_attr_destroy(&attr);
787
788 if (ret != 0) {
789 if (PrintMiscellaneous && (Verbose || WizardMode)) {
790 perror("pthread_create()");
791 }
792 // Need to clean up stuff we've allocated so far
793 thread->set_osthread(NULL);
794 delete osthread;
795 return false;
796 }
797
798 // Store pthread info into the OSThread
799 osthread->set_pthread_id(tid);
800
801 // Wait until child thread is either initialized or aborted
802 {
803 Monitor* sync_with_child = osthread->startThread_lock();
804 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
805 while ((state = osthread->get_state()) == ALLOCATED) {
806 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
807 }
808 }
809
810 }
811
812 // Aborted due to thread limit being reached
813 if (state == ZOMBIE) {
814 thread->set_osthread(NULL);
815 delete osthread;
816 return false;
817 }
818
819 // The thread is returned suspended (in state INITIALIZED),
820 // and is started higher up in the call chain
821 assert(state == INITIALIZED, "race condition");
822 return true;
823 }
824
825 /////////////////////////////////////////////////////////////////////////////
826 // attach existing thread
827
828 // bootstrap the main thread
829 bool os::create_main_thread(JavaThread* thread) {
830 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
831 return create_attached_thread(thread);
832 }
833
834 bool os::create_attached_thread(JavaThread* thread) {
835 #ifdef ASSERT
836 thread->verify_not_published();
837 #endif
838
839 // Allocate the OSThread object
840 OSThread* osthread = new OSThread(NULL, NULL);
841
842 if (osthread == NULL) {
843 return false;
844 }
845
846 // Store pthread info into the OSThread
847 #ifdef __APPLE__
848 osthread->set_thread_id(::mach_thread_self());
849 osthread->set_unique_thread_id(locate_unique_thread_id());
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 == os::Bsd::SuspendResume::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() != os::Bsd::SuspendResume::SR_CONTINUE);
2707
2708 resume_clear_context(osthread);
2709
2710 } else {
2711 assert(action == os::Bsd::SuspendResume::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(os::Bsd::SuspendResume::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(os::Bsd::SuspendResume::SR_NONE);
2775 return true;
2776 }
2777 else {
2778 osthread->sr.set_suspend_action(os::Bsd::SuspendResume::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(os::Bsd::SuspendResume::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(os::Bsd::SuspendResume::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 int orig_errno = errno; // Preserve errno value over signal handler.
2877 JVM_handle_bsd_signal(sig, info, uc, true);
2878 errno = orig_errno;
2879 }
2880
2881
2882 // This boolean allows users to forward their own non-matching signals
2883 // to JVM_handle_bsd_signal, harmlessly.
2884 bool os::Bsd::signal_handlers_are_installed = false;
2885
2886 // For signal-chaining
2887 struct sigaction os::Bsd::sigact[MAXSIGNUM];
2888 unsigned int os::Bsd::sigs = 0;
2889 bool os::Bsd::libjsig_is_loaded = false;
2890 typedef struct sigaction *(*get_signal_t)(int);
2891 get_signal_t os::Bsd::get_signal_action = NULL;
2892
2893 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2894 struct sigaction *actp = NULL;
2895
2896 if (libjsig_is_loaded) {
2897 // Retrieve the old signal handler from libjsig
2898 actp = (*get_signal_action)(sig);
2899 }
2900 if (actp == NULL) {
2901 // Retrieve the preinstalled signal handler from jvm
2902 actp = get_preinstalled_handler(sig);
2903 }
2904
2905 return actp;
2906 }
2907
2908 static bool call_chained_handler(struct sigaction *actp, int sig,
2909 siginfo_t *siginfo, void *context) {
2910 // Call the old signal handler
2911 if (actp->sa_handler == SIG_DFL) {
2912 // It's more reasonable to let jvm treat it as an unexpected exception
2913 // instead of taking the default action.
2914 return false;
2915 } else if (actp->sa_handler != SIG_IGN) {
2916 if ((actp->sa_flags & SA_NODEFER) == 0) {
2917 // automaticlly block the signal
2918 sigaddset(&(actp->sa_mask), sig);
2919 }
2920
2921 sa_handler_t hand;
2922 sa_sigaction_t sa;
2923 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2924 // retrieve the chained handler
2925 if (siginfo_flag_set) {
2926 sa = actp->sa_sigaction;
2927 } else {
2928 hand = actp->sa_handler;
2929 }
2930
2931 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2932 actp->sa_handler = SIG_DFL;
2933 }
2934
2935 // try to honor the signal mask
2936 sigset_t oset;
2937 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2938
2939 // call into the chained handler
2940 if (siginfo_flag_set) {
2941 (*sa)(sig, siginfo, context);
2942 } else {
2943 (*hand)(sig);
2944 }
2945
2946 // restore the signal mask
2947 pthread_sigmask(SIG_SETMASK, &oset, 0);
2948 }
2949 // Tell jvm's signal handler the signal is taken care of.
2950 return true;
2951 }
2952
2953 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2954 bool chained = false;
2955 // signal-chaining
2956 if (UseSignalChaining) {
2957 struct sigaction *actp = get_chained_signal_action(sig);
2958 if (actp != NULL) {
2959 chained = call_chained_handler(actp, sig, siginfo, context);
2960 }
2961 }
2962 return chained;
2963 }
2964
2965 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
2966 if ((( (unsigned int)1 << sig ) & sigs) != 0) {
2967 return &sigact[sig];
2968 }
2969 return NULL;
2970 }
2971
2972 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
2973 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
2974 sigact[sig] = oldAct;
2975 sigs |= (unsigned int)1 << sig;
2976 }
2977
2978 // for diagnostic
2979 int os::Bsd::sigflags[MAXSIGNUM];
2980
2981 int os::Bsd::get_our_sigflags(int sig) {
2982 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
2983 return sigflags[sig];
2984 }
2985
2986 void os::Bsd::set_our_sigflags(int sig, int flags) {
2987 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
2988 sigflags[sig] = flags;
2989 }
2990
2991 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2992 // Check for overwrite.
2993 struct sigaction oldAct;
2994 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2995
2996 void* oldhand = oldAct.sa_sigaction
2997 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2998 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2999 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3000 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3001 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3002 if (AllowUserSignalHandlers || !set_installed) {
3003 // Do not overwrite; user takes responsibility to forward to us.
3004 return;
3005 } else if (UseSignalChaining) {
3006 // save the old handler in jvm
3007 save_preinstalled_handler(sig, oldAct);
3008 // libjsig also interposes the sigaction() call below and saves the
3009 // old sigaction on it own.
3010 } else {
3011 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3012 "%#lx for signal %d.", (long)oldhand, sig));
3013 }
3014 }
3015
3016 struct sigaction sigAct;
3017 sigfillset(&(sigAct.sa_mask));
3018 sigAct.sa_handler = SIG_DFL;
3019 if (!set_installed) {
3020 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3021 } else {
3022 sigAct.sa_sigaction = signalHandler;
3023 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3024 }
3025 // Save flags, which are set by ours
3026 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3027 sigflags[sig] = sigAct.sa_flags;
3028
3029 int ret = sigaction(sig, &sigAct, &oldAct);
3030 assert(ret == 0, "check");
3031
3032 void* oldhand2 = oldAct.sa_sigaction
3033 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3034 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3035 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3036 }
3037
3038 // install signal handlers for signals that HotSpot needs to
3039 // handle in order to support Java-level exception handling.
3040
3041 void os::Bsd::install_signal_handlers() {
3042 if (!signal_handlers_are_installed) {
3043 signal_handlers_are_installed = true;
3044
3045 // signal-chaining
3046 typedef void (*signal_setting_t)();
3047 signal_setting_t begin_signal_setting = NULL;
3048 signal_setting_t end_signal_setting = NULL;
3049 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3050 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3051 if (begin_signal_setting != NULL) {
3052 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3053 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3054 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3055 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3056 libjsig_is_loaded = true;
3057 assert(UseSignalChaining, "should enable signal-chaining");
3058 }
3059 if (libjsig_is_loaded) {
3060 // Tell libjsig jvm is setting signal handlers
3061 (*begin_signal_setting)();
3062 }
3063
3064 set_signal_handler(SIGSEGV, true);
3065 set_signal_handler(SIGPIPE, true);
3066 set_signal_handler(SIGBUS, true);
3067 set_signal_handler(SIGILL, true);
3068 set_signal_handler(SIGFPE, true);
3069 set_signal_handler(SIGXFSZ, true);
3070
3071 #if defined(__APPLE__)
3072 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3073 // signals caught and handled by the JVM. To work around this, we reset the mach task
3074 // signal handler that's placed on our process by CrashReporter. This disables
3075 // CrashReporter-based reporting.
3076 //
3077 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3078 // on caught fatal signals.
3079 //
3080 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3081 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3082 // exception handling, while leaving the standard BSD signal handlers functional.
3083 kern_return_t kr;
3084 kr = task_set_exception_ports(mach_task_self(),
3085 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3086 MACH_PORT_NULL,
3087 EXCEPTION_STATE_IDENTITY,
3088 MACHINE_THREAD_STATE);
3089
3090 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3091 #endif
3092
3093 if (libjsig_is_loaded) {
3094 // Tell libjsig jvm finishes setting signal handlers
3095 (*end_signal_setting)();
3096 }
3097
3098 // We don't activate signal checker if libjsig is in place, we trust ourselves
3099 // and if UserSignalHandler is installed all bets are off
3100 if (CheckJNICalls) {
3101 if (libjsig_is_loaded) {
3102 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3103 check_signals = false;
3104 }
3105 if (AllowUserSignalHandlers) {
3106 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3107 check_signals = false;
3108 }
3109 }
3110 }
3111 }
3112
3113
3114 /////
3115 // glibc on Bsd platform uses non-documented flag
3116 // to indicate, that some special sort of signal
3117 // trampoline is used.
3118 // We will never set this flag, and we should
3119 // ignore this flag in our diagnostic
3120 #ifdef SIGNIFICANT_SIGNAL_MASK
3121 #undef SIGNIFICANT_SIGNAL_MASK
3122 #endif
3123 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3124
3125 static const char* get_signal_handler_name(address handler,
3126 char* buf, int buflen) {
3127 int offset;
3128 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3129 if (found) {
3130 // skip directory names
3131 const char *p1, *p2;
3132 p1 = buf;
3133 size_t len = strlen(os::file_separator());
3134 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3135 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3136 } else {
3137 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3138 }
3139 return buf;
3140 }
3141
3142 static void print_signal_handler(outputStream* st, int sig,
3143 char* buf, size_t buflen) {
3144 struct sigaction sa;
3145
3146 sigaction(sig, NULL, &sa);
3147
3148 // See comment for SIGNIFICANT_SIGNAL_MASK define
3149 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3150
3151 st->print("%s: ", os::exception_name(sig, buf, buflen));
3152
3153 address handler = (sa.sa_flags & SA_SIGINFO)
3154 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3155 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3156
3157 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3158 st->print("SIG_DFL");
3159 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3160 st->print("SIG_IGN");
3161 } else {
3162 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3163 }
3164
3165 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
3166
3167 address rh = VMError::get_resetted_sighandler(sig);
3168 // May be, handler was resetted by VMError?
3169 if(rh != NULL) {
3170 handler = rh;
3171 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3172 }
3173
3174 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
3175
3176 // Check: is it our handler?
3177 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3178 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3179 // It is our signal handler
3180 // check for flags, reset system-used one!
3181 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3182 st->print(
3183 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3184 os::Bsd::get_our_sigflags(sig));
3185 }
3186 }
3187 st->cr();
3188 }
3189
3190
3191 #define DO_SIGNAL_CHECK(sig) \
3192 if (!sigismember(&check_signal_done, sig)) \
3193 os::Bsd::check_signal_handler(sig)
3194
3195 // This method is a periodic task to check for misbehaving JNI applications
3196 // under CheckJNI, we can add any periodic checks here
3197
3198 void os::run_periodic_checks() {
3199
3200 if (check_signals == false) return;
3201
3202 // SEGV and BUS if overridden could potentially prevent
3203 // generation of hs*.log in the event of a crash, debugging
3204 // such a case can be very challenging, so we absolutely
3205 // check the following for a good measure:
3206 DO_SIGNAL_CHECK(SIGSEGV);
3207 DO_SIGNAL_CHECK(SIGILL);
3208 DO_SIGNAL_CHECK(SIGFPE);
3209 DO_SIGNAL_CHECK(SIGBUS);
3210 DO_SIGNAL_CHECK(SIGPIPE);
3211 DO_SIGNAL_CHECK(SIGXFSZ);
3212
3213
3214 // ReduceSignalUsage allows the user to override these handlers
3215 // see comments at the very top and jvm_solaris.h
3216 if (!ReduceSignalUsage) {
3217 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3218 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3219 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3220 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3221 }
3222
3223 DO_SIGNAL_CHECK(SR_signum);
3224 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3225 }
3226
3227 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3228
3229 static os_sigaction_t os_sigaction = NULL;
3230
3231 void os::Bsd::check_signal_handler(int sig) {
3232 char buf[O_BUFLEN];
3233 address jvmHandler = NULL;
3234
3235
3236 struct sigaction act;
3237 if (os_sigaction == NULL) {
3238 // only trust the default sigaction, in case it has been interposed
3239 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3240 if (os_sigaction == NULL) return;
3241 }
3242
3243 os_sigaction(sig, (struct sigaction*)NULL, &act);
3244
3245
3246 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3247
3248 address thisHandler = (act.sa_flags & SA_SIGINFO)
3249 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3250 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
3251
3252
3253 switch(sig) {
3254 case SIGSEGV:
3255 case SIGBUS:
3256 case SIGFPE:
3257 case SIGPIPE:
3258 case SIGILL:
3259 case SIGXFSZ:
3260 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3261 break;
3262
3263 case SHUTDOWN1_SIGNAL:
3264 case SHUTDOWN2_SIGNAL:
3265 case SHUTDOWN3_SIGNAL:
3266 case BREAK_SIGNAL:
3267 jvmHandler = (address)user_handler();
3268 break;
3269
3270 case INTERRUPT_SIGNAL:
3271 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3272 break;
3273
3274 default:
3275 if (sig == SR_signum) {
3276 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3277 } else {
3278 return;
3279 }
3280 break;
3281 }
3282
3283 if (thisHandler != jvmHandler) {
3284 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3285 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3286 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3287 // No need to check this sig any longer
3288 sigaddset(&check_signal_done, sig);
3289 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3290 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3291 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig));
3292 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3293 // No need to check this sig any longer
3294 sigaddset(&check_signal_done, sig);
3295 }
3296
3297 // Dump all the signal
3298 if (sigismember(&check_signal_done, sig)) {
3299 print_signal_handlers(tty, buf, O_BUFLEN);
3300 }
3301 }
3302
3303 extern void report_error(char* file_name, int line_no, char* title, char* format, ...);
3304
3305 extern bool signal_name(int signo, char* buf, size_t len);
3306
3307 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3308 if (0 < exception_code && exception_code <= SIGRTMAX) {
3309 // signal
3310 if (!signal_name(exception_code, buf, size)) {
3311 jio_snprintf(buf, size, "SIG%d", exception_code);
3312 }
3313 return buf;
3314 } else {
3315 return NULL;
3316 }
3317 }
3318
3319 // this is called _before_ the most of global arguments have been parsed
3320 void os::init(void) {
3321 char dummy; /* used to get a guess on initial stack address */
3322 // first_hrtime = gethrtime();
3323
3324 // With BsdThreads the JavaMain thread pid (primordial thread)
3325 // is different than the pid of the java launcher thread.
3326 // So, on Bsd, the launcher thread pid is passed to the VM
3327 // via the sun.java.launcher.pid property.
3328 // Use this property instead of getpid() if it was correctly passed.
3329 // See bug 6351349.
3330 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3331
3332 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3333
3334 clock_tics_per_sec = CLK_TCK;
3335
3336 init_random(1234567);
3337
3338 ThreadCritical::initialize();
3339
3340 Bsd::set_page_size(getpagesize());
3341 if (Bsd::page_size() == -1) {
3342 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)",
3343 strerror(errno)));
3344 }
3345 init_page_sizes((size_t) Bsd::page_size());
3346
3347 Bsd::initialize_system_info();
3348
3349 // main_thread points to the aboriginal thread
3350 Bsd::_main_thread = pthread_self();
3351
3352 Bsd::clock_init();
3353 initial_time_count = os::elapsed_counter();
3354
3355 #ifdef __APPLE__
3356 // XXXDARWIN
3357 // Work around the unaligned VM callbacks in hotspot's
3358 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3359 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3360 // alignment when doing symbol lookup. To work around this, we force early
3361 // binding of all symbols now, thus binding when alignment is known-good.
3362 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3363 #endif
3364 }
3365
3366 // To install functions for atexit system call
3367 extern "C" {
3368 static void perfMemory_exit_helper() {
3369 perfMemory_exit();
3370 }
3371 }
3372
3373 // this is called _after_ the global arguments have been parsed
3374 jint os::init_2(void)
3375 {
3376 // Allocate a single page and mark it as readable for safepoint polling
3377 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3378 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" );
3379
3380 os::set_polling_page( polling_page );
3381
3382 #ifndef PRODUCT
3383 if(Verbose && PrintMiscellaneous)
3384 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3385 #endif
3386
3387 if (!UseMembar) {
3388 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3389 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3390 os::set_memory_serialize_page( mem_serialize_page );
3391
3392 #ifndef PRODUCT
3393 if(Verbose && PrintMiscellaneous)
3394 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3395 #endif
3396 }
3397
3398 os::large_page_init();
3399
3400 // initialize suspend/resume support - must do this before signal_sets_init()
3401 if (SR_initialize() != 0) {
3402 perror("SR_initialize failed");
3403 return JNI_ERR;
3404 }
3405
3406 Bsd::signal_sets_init();
3407 Bsd::install_signal_handlers();
3408
3409 // Check minimum allowable stack size for thread creation and to initialize
3410 // the java system classes, including StackOverflowError - depends on page
3411 // size. Add a page for compiler2 recursion in main thread.
3412 // Add in 2*BytesPerWord times page size to account for VM stack during
3413 // class initialization depending on 32 or 64 bit VM.
3414 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
3415 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3416 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
3417
3418 size_t threadStackSizeInBytes = ThreadStackSize * K;
3419 if (threadStackSizeInBytes != 0 &&
3420 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
3421 tty->print_cr("\nThe stack size specified is too small, "
3422 "Specify at least %dk",
3423 os::Bsd::min_stack_allowed/ K);
3424 return JNI_ERR;
3425 }
3426
3427 // Make the stack size a multiple of the page size so that
3428 // the yellow/red zones can be guarded.
3429 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
3430 vm_page_size()));
3431
3432 if (MaxFDLimit) {
3433 // set the number of file descriptors to max. print out error
3434 // if getrlimit/setrlimit fails but continue regardless.
3435 struct rlimit nbr_files;
3436 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3437 if (status != 0) {
3438 if (PrintMiscellaneous && (Verbose || WizardMode))
3439 perror("os::init_2 getrlimit failed");
3440 } else {
3441 nbr_files.rlim_cur = nbr_files.rlim_max;
3442
3443 #ifdef __APPLE__
3444 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3445 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3446 // be used instead
3447 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3448 #endif
3449
3450 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3451 if (status != 0) {
3452 if (PrintMiscellaneous && (Verbose || WizardMode))
3453 perror("os::init_2 setrlimit failed");
3454 }
3455 }
3456 }
3457
3458 // at-exit methods are called in the reverse order of their registration.
3459 // atexit functions are called on return from main or as a result of a
3460 // call to exit(3C). There can be only 32 of these functions registered
3461 // and atexit() does not set errno.
3462
3463 if (PerfAllowAtExitRegistration) {
3464 // only register atexit functions if PerfAllowAtExitRegistration is set.
3465 // atexit functions can be delayed until process exit time, which
3466 // can be problematic for embedded VM situations. Embedded VMs should
3467 // call DestroyJavaVM() to assure that VM resources are released.
3468
3469 // note: perfMemory_exit_helper atexit function may be removed in
3470 // the future if the appropriate cleanup code can be added to the
3471 // VM_Exit VMOperation's doit method.
3472 if (atexit(perfMemory_exit_helper) != 0) {
3473 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3474 }
3475 }
3476
3477 // initialize thread priority policy
3478 prio_init();
3479
3480 #ifdef __APPLE__
3481 // dynamically link to objective c gc registration
3482 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3483 if (handleLibObjc != NULL) {
3484 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3485 }
3486 #endif
3487
3488 return JNI_OK;
3489 }
3490
3491 // this is called at the end of vm_initialization
3492 void os::init_3(void) { }
3493
3494 // Mark the polling page as unreadable
3495 void os::make_polling_page_unreadable(void) {
3496 if( !guard_memory((char*)_polling_page, Bsd::page_size()) )
3497 fatal("Could not disable polling page");
3498 };
3499
3500 // Mark the polling page as readable
3501 void os::make_polling_page_readable(void) {
3502 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3503 fatal("Could not enable polling page");
3504 }
3505 };
3506
3507 int os::active_processor_count() {
3508 return _processor_count;
3509 }
3510
3511 void os::set_native_thread_name(const char *name) {
3512 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3513 // This is only supported in Snow Leopard and beyond
3514 if (name != NULL) {
3515 // Add a "Java: " prefix to the name
3516 char buf[MAXTHREADNAMESIZE];
3517 snprintf(buf, sizeof(buf), "Java: %s", name);
3518 pthread_setname_np(buf);
3519 }
3520 #endif
3521 }
3522
3523 bool os::distribute_processes(uint length, uint* distribution) {
3524 // Not yet implemented.
3525 return false;
3526 }
3527
3528 bool os::bind_to_processor(uint processor_id) {
3529 // Not yet implemented.
3530 return false;
3531 }
3532
3533 ///
3534
3535 // Suspends the target using the signal mechanism and then grabs the PC before
3536 // resuming the target. Used by the flat-profiler only
3537 ExtendedPC os::get_thread_pc(Thread* thread) {
3538 // Make sure that it is called by the watcher for the VMThread
3539 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3540 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3541
3542 ExtendedPC epc;
3543
3544 OSThread* osthread = thread->osthread();
3545 if (do_suspend(osthread)) {
3546 if (osthread->ucontext() != NULL) {
3547 epc = os::Bsd::ucontext_get_pc(osthread->ucontext());
3548 } else {
3549 // NULL context is unexpected, double-check this is the VMThread
3550 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3551 }
3552 do_resume(osthread);
3553 }
3554 // failure means pthread_kill failed for some reason - arguably this is
3555 // a fatal problem, but such problems are ignored elsewhere
3556
3557 return epc;
3558 }
3559
3560 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime)
3561 {
3562 return pthread_cond_timedwait(_cond, _mutex, _abstime);
3563 }
3564
3565 ////////////////////////////////////////////////////////////////////////////////
3566 // debug support
3567
3568 static address same_page(address x, address y) {
3569 int page_bits = -os::vm_page_size();
3570 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3571 return x;
3572 else if (x > y)
3573 return (address)(intptr_t(y) | ~page_bits) + 1;
3574 else
3575 return (address)(intptr_t(y) & page_bits);
3576 }
3577
3578 bool os::find(address addr, outputStream* st) {
3579 Dl_info dlinfo;
3580 memset(&dlinfo, 0, sizeof(dlinfo));
3581 if (dladdr(addr, &dlinfo)) {
3582 st->print(PTR_FORMAT ": ", addr);
3583 if (dlinfo.dli_sname != NULL) {
3584 st->print("%s+%#x", dlinfo.dli_sname,
3585 addr - (intptr_t)dlinfo.dli_saddr);
3586 } else if (dlinfo.dli_fname) {
3587 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3588 } else {
3589 st->print("<absolute address>");
3590 }
3591 if (dlinfo.dli_fname) {
3592 st->print(" in %s", dlinfo.dli_fname);
3593 }
3594 if (dlinfo.dli_fbase) {
3595 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3596 }
3597 st->cr();
3598
3599 if (Verbose) {
3600 // decode some bytes around the PC
3601 address begin = same_page(addr-40, addr);
3602 address end = same_page(addr+40, addr);
3603 address lowest = (address) dlinfo.dli_sname;
3604 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3605 if (begin < lowest) begin = lowest;
3606 Dl_info dlinfo2;
3607 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
3608 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
3609 end = (address) dlinfo2.dli_saddr;
3610 Disassembler::decode(begin, end, st);
3611 }
3612 return true;
3613 }
3614 return false;
3615 }
3616
3617 ////////////////////////////////////////////////////////////////////////////////
3618 // misc
3619
3620 // This does not do anything on Bsd. This is basically a hook for being
3621 // able to use structured exception handling (thread-local exception filters)
3622 // on, e.g., Win32.
3623 void
3624 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3625 JavaCallArguments* args, Thread* thread) {
3626 f(value, method, args, thread);
3627 }
3628
3629 void os::print_statistics() {
3630 }
3631
3632 int os::message_box(const char* title, const char* message) {
3633 int i;
3634 fdStream err(defaultStream::error_fd());
3635 for (i = 0; i < 78; i++) err.print_raw("=");
3636 err.cr();
3637 err.print_raw_cr(title);
3638 for (i = 0; i < 78; i++) err.print_raw("-");
3639 err.cr();
3640 err.print_raw_cr(message);
3641 for (i = 0; i < 78; i++) err.print_raw("=");
3642 err.cr();
3643
3644 char buf[16];
3645 // Prevent process from exiting upon "read error" without consuming all CPU
3646 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3647
3648 return buf[0] == 'y' || buf[0] == 'Y';
3649 }
3650
3651 int os::stat(const char *path, struct stat *sbuf) {
3652 char pathbuf[MAX_PATH];
3653 if (strlen(path) > MAX_PATH - 1) {
3654 errno = ENAMETOOLONG;
3655 return -1;
3656 }
3657 os::native_path(strcpy(pathbuf, path));
3658 return ::stat(pathbuf, sbuf);
3659 }
3660
3661 bool os::check_heap(bool force) {
3662 return true;
3663 }
3664
3665 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
3666 return ::vsnprintf(buf, count, format, args);
3667 }
3668
3669 // Is a (classpath) directory empty?
3670 bool os::dir_is_empty(const char* path) {
3671 DIR *dir = NULL;
3672 struct dirent *ptr;
3673
3674 dir = opendir(path);
3675 if (dir == NULL) return true;
3676
3677 /* Scan the directory */
3678 bool result = true;
3679 char buf[sizeof(struct dirent) + MAX_PATH];
3680 while (result && (ptr = ::readdir(dir)) != NULL) {
3681 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3682 result = false;
3683 }
3684 }
3685 closedir(dir);
3686 return result;
3687 }
3688
3689 // This code originates from JDK's sysOpen and open64_w
3690 // from src/solaris/hpi/src/system_md.c
3691
3692 #ifndef O_DELETE
3693 #define O_DELETE 0x10000
3694 #endif
3695
3696 // Open a file. Unlink the file immediately after open returns
3697 // if the specified oflag has the O_DELETE flag set.
3698 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
3699
3700 int os::open(const char *path, int oflag, int mode) {
3701
3702 if (strlen(path) > MAX_PATH - 1) {
3703 errno = ENAMETOOLONG;
3704 return -1;
3705 }
3706 int fd;
3707 int o_delete = (oflag & O_DELETE);
3708 oflag = oflag & ~O_DELETE;
3709
3710 fd = ::open(path, oflag, mode);
3711 if (fd == -1) return -1;
3712
3713 //If the open succeeded, the file might still be a directory
3714 {
3715 struct stat buf;
3716 int ret = ::fstat(fd, &buf);
3717 int st_mode = buf.st_mode;
3718
3719 if (ret != -1) {
3720 if ((st_mode & S_IFMT) == S_IFDIR) {
3721 errno = EISDIR;
3722 ::close(fd);
3723 return -1;
3724 }
3725 } else {
3726 ::close(fd);
3727 return -1;
3728 }
3729 }
3730
3731 /*
3732 * All file descriptors that are opened in the JVM and not
3733 * specifically destined for a subprocess should have the
3734 * close-on-exec flag set. If we don't set it, then careless 3rd
3735 * party native code might fork and exec without closing all
3736 * appropriate file descriptors (e.g. as we do in closeDescriptors in
3737 * UNIXProcess.c), and this in turn might:
3738 *
3739 * - cause end-of-file to fail to be detected on some file
3740 * descriptors, resulting in mysterious hangs, or
3741 *
3742 * - might cause an fopen in the subprocess to fail on a system
3743 * suffering from bug 1085341.
3744 *
3745 * (Yes, the default setting of the close-on-exec flag is a Unix
3746 * design flaw)
3747 *
3748 * See:
3749 * 1085341: 32-bit stdio routines should support file descriptors >255
3750 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3751 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3752 */
3753 #ifdef FD_CLOEXEC
3754 {
3755 int flags = ::fcntl(fd, F_GETFD);
3756 if (flags != -1)
3757 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3758 }
3759 #endif
3760
3761 if (o_delete != 0) {
3762 ::unlink(path);
3763 }
3764 return fd;
3765 }
3766
3767
3768 // create binary file, rewriting existing file if required
3769 int os::create_binary_file(const char* path, bool rewrite_existing) {
3770 int oflags = O_WRONLY | O_CREAT;
3771 if (!rewrite_existing) {
3772 oflags |= O_EXCL;
3773 }
3774 return ::open(path, oflags, S_IREAD | S_IWRITE);
3775 }
3776
3777 // return current position of file pointer
3778 jlong os::current_file_offset(int fd) {
3779 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3780 }
3781
3782 // move file pointer to the specified offset
3783 jlong os::seek_to_file_offset(int fd, jlong offset) {
3784 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3785 }
3786
3787 // This code originates from JDK's sysAvailable
3788 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3789
3790 int os::available(int fd, jlong *bytes) {
3791 jlong cur, end;
3792 int mode;
3793 struct stat buf;
3794
3795 if (::fstat(fd, &buf) >= 0) {
3796 mode = buf.st_mode;
3797 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3798 /*
3799 * XXX: is the following call interruptible? If so, this might
3800 * need to go through the INTERRUPT_IO() wrapper as for other
3801 * blocking, interruptible calls in this file.
3802 */
3803 int n;
3804 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3805 *bytes = n;
3806 return 1;
3807 }
3808 }
3809 }
3810 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3811 return 0;
3812 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3813 return 0;
3814 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3815 return 0;
3816 }
3817 *bytes = end - cur;
3818 return 1;
3819 }
3820
3821 int os::socket_available(int fd, jint *pbytes) {
3822 if (fd < 0)
3823 return OS_OK;
3824
3825 int ret;
3826
3827 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
3828
3829 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
3830 // is expected to return 0 on failure and 1 on success to the jdk.
3831
3832 return (ret == OS_ERR) ? 0 : 1;
3833 }
3834
3835 // Map a block of memory.
3836 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3837 char *addr, size_t bytes, bool read_only,
3838 bool allow_exec) {
3839 int prot;
3840 int flags;
3841
3842 if (read_only) {
3843 prot = PROT_READ;
3844 flags = MAP_SHARED;
3845 } else {
3846 prot = PROT_READ | PROT_WRITE;
3847 flags = MAP_PRIVATE;
3848 }
3849
3850 if (allow_exec) {
3851 prot |= PROT_EXEC;
3852 }
3853
3854 if (addr != NULL) {
3855 flags |= MAP_FIXED;
3856 }
3857
3858 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3859 fd, file_offset);
3860 if (mapped_address == MAP_FAILED) {
3861 return NULL;
3862 }
3863 return mapped_address;
3864 }
3865
3866
3867 // Remap a block of memory.
3868 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3869 char *addr, size_t bytes, bool read_only,
3870 bool allow_exec) {
3871 // same as map_memory() on this OS
3872 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3873 allow_exec);
3874 }
3875
3876
3877 // Unmap a block of memory.
3878 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3879 return munmap(addr, bytes) == 0;
3880 }
3881
3882 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3883 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3884 // of a thread.
3885 //
3886 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3887 // the fast estimate available on the platform.
3888
3889 jlong os::current_thread_cpu_time() {
3890 #ifdef __APPLE__
3891 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3892 #else
3893 Unimplemented();
3894 return 0;
3895 #endif
3896 }
3897
3898 jlong os::thread_cpu_time(Thread* thread) {
3899 #ifdef __APPLE__
3900 return os::thread_cpu_time(thread, true /* user + sys */);
3901 #else
3902 Unimplemented();
3903 return 0;
3904 #endif
3905 }
3906
3907 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3908 #ifdef __APPLE__
3909 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3910 #else
3911 Unimplemented();
3912 return 0;
3913 #endif
3914 }
3915
3916 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3917 #ifdef __APPLE__
3918 struct thread_basic_info tinfo;
3919 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3920 kern_return_t kr;
3921 thread_t mach_thread;
3922
3923 mach_thread = thread->osthread()->thread_id();
3924 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3925 if (kr != KERN_SUCCESS)
3926 return -1;
3927
3928 if (user_sys_cpu_time) {
3929 jlong nanos;
3930 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3931 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3932 return nanos;
3933 } else {
3934 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3935 }
3936 #else
3937 Unimplemented();
3938 return 0;
3939 #endif
3940 }
3941
3942
3943 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3944 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3945 info_ptr->may_skip_backward = false; // elapsed time not wall time
3946 info_ptr->may_skip_forward = false; // elapsed time not wall time
3947 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3948 }
3949
3950 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3951 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3952 info_ptr->may_skip_backward = false; // elapsed time not wall time
3953 info_ptr->may_skip_forward = false; // elapsed time not wall time
3954 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3955 }
3956
3957 bool os::is_thread_cpu_time_supported() {
3958 #ifdef __APPLE__
3959 return true;
3960 #else
3961 return false;
3962 #endif
3963 }
3964
3965 // System loadavg support. Returns -1 if load average cannot be obtained.
3966 // Bsd doesn't yet have a (official) notion of processor sets,
3967 // so just return the system wide load average.
3968 int os::loadavg(double loadavg[], int nelem) {
3969 return ::getloadavg(loadavg, nelem);
3970 }
3971
3972 void os::pause() {
3973 char filename[MAX_PATH];
3974 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3975 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3976 } else {
3977 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3978 }
3979
3980 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3981 if (fd != -1) {
3982 struct stat buf;
3983 ::close(fd);
3984 while (::stat(filename, &buf) == 0) {
3985 (void)::poll(NULL, 0, 100);
3986 }
3987 } else {
3988 jio_fprintf(stderr,
3989 "Could not open pause file '%s', continuing immediately.\n", filename);
3990 }
3991 }
3992
3993
3994 // Refer to the comments in os_solaris.cpp park-unpark.
3995 //
3996 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
3997 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
3998 // For specifics regarding the bug see GLIBC BUGID 261237 :
3999 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4000 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4001 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4002 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4003 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4004 // and monitorenter when we're using 1-0 locking. All those operations may result in
4005 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4006 // of libpthread avoids the problem, but isn't practical.
4007 //
4008 // Possible remedies:
4009 //
4010 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4011 // This is palliative and probabilistic, however. If the thread is preempted
4012 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4013 // than the minimum period may have passed, and the abstime may be stale (in the
4014 // past) resultin in a hang. Using this technique reduces the odds of a hang
4015 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4016 //
4017 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4018 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4019 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4020 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4021 // thread.
4022 //
4023 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4024 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4025 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4026 // This also works well. In fact it avoids kernel-level scalability impediments
4027 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4028 // timers in a graceful fashion.
4029 //
4030 // 4. When the abstime value is in the past it appears that control returns
4031 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4032 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4033 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4034 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4035 // It may be possible to avoid reinitialization by checking the return
4036 // value from pthread_cond_timedwait(). In addition to reinitializing the
4037 // condvar we must establish the invariant that cond_signal() is only called
4038 // within critical sections protected by the adjunct mutex. This prevents
4039 // cond_signal() from "seeing" a condvar that's in the midst of being
4040 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4041 // desirable signal-after-unlock optimization that avoids futile context switching.
4042 //
4043 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4044 // structure when a condvar is used or initialized. cond_destroy() would
4045 // release the helper structure. Our reinitialize-after-timedwait fix
4046 // put excessive stress on malloc/free and locks protecting the c-heap.
4047 //
4048 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4049 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4050 // and only enabling the work-around for vulnerable environments.
4051
4052 // utility to compute the abstime argument to timedwait:
4053 // millis is the relative timeout time
4054 // abstime will be the absolute timeout time
4055 // TODO: replace compute_abstime() with unpackTime()
4056
4057 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) {
4058 if (millis < 0) millis = 0;
4059 struct timeval now;
4060 int status = gettimeofday(&now, NULL);
4061 assert(status == 0, "gettimeofday");
4062 jlong seconds = millis / 1000;
4063 millis %= 1000;
4064 if (seconds > 50000000) { // see man cond_timedwait(3T)
4065 seconds = 50000000;
4066 }
4067 abstime->tv_sec = now.tv_sec + seconds;
4068 long usec = now.tv_usec + millis * 1000;
4069 if (usec >= 1000000) {
4070 abstime->tv_sec += 1;
4071 usec -= 1000000;
4072 }
4073 abstime->tv_nsec = usec * 1000;
4074 return abstime;
4075 }
4076
4077
4078 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4079 // Conceptually TryPark() should be equivalent to park(0).
4080
4081 int os::PlatformEvent::TryPark() {
4082 for (;;) {
4083 const int v = _Event ;
4084 guarantee ((v == 0) || (v == 1), "invariant") ;
4085 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
4086 }
4087 }
4088
4089 void os::PlatformEvent::park() { // AKA "down()"
4090 // Invariant: Only the thread associated with the Event/PlatformEvent
4091 // may call park().
4092 // TODO: assert that _Assoc != NULL or _Assoc == Self
4093 int v ;
4094 for (;;) {
4095 v = _Event ;
4096 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4097 }
4098 guarantee (v >= 0, "invariant") ;
4099 if (v == 0) {
4100 // Do this the hard way by blocking ...
4101 int status = pthread_mutex_lock(_mutex);
4102 assert_status(status == 0, status, "mutex_lock");
4103 guarantee (_nParked == 0, "invariant") ;
4104 ++ _nParked ;
4105 while (_Event < 0) {
4106 status = pthread_cond_wait(_cond, _mutex);
4107 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4108 // Treat this the same as if the wait was interrupted
4109 if (status == ETIMEDOUT) { status = EINTR; }
4110 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4111 }
4112 -- _nParked ;
4113
4114 _Event = 0 ;
4115 status = pthread_mutex_unlock(_mutex);
4116 assert_status(status == 0, status, "mutex_unlock");
4117 // Paranoia to ensure our locked and lock-free paths interact
4118 // correctly with each other.
4119 OrderAccess::fence();
4120 }
4121 guarantee (_Event >= 0, "invariant") ;
4122 }
4123
4124 int os::PlatformEvent::park(jlong millis) {
4125 guarantee (_nParked == 0, "invariant") ;
4126
4127 int v ;
4128 for (;;) {
4129 v = _Event ;
4130 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4131 }
4132 guarantee (v >= 0, "invariant") ;
4133 if (v != 0) return OS_OK ;
4134
4135 // We do this the hard way, by blocking the thread.
4136 // Consider enforcing a minimum timeout value.
4137 struct timespec abst;
4138 compute_abstime(&abst, millis);
4139
4140 int ret = OS_TIMEOUT;
4141 int status = pthread_mutex_lock(_mutex);
4142 assert_status(status == 0, status, "mutex_lock");
4143 guarantee (_nParked == 0, "invariant") ;
4144 ++_nParked ;
4145
4146 // Object.wait(timo) will return because of
4147 // (a) notification
4148 // (b) timeout
4149 // (c) thread.interrupt
4150 //
4151 // Thread.interrupt and object.notify{All} both call Event::set.
4152 // That is, we treat thread.interrupt as a special case of notification.
4153 // The underlying Solaris implementation, cond_timedwait, admits
4154 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4155 // JVM from making those visible to Java code. As such, we must
4156 // filter out spurious wakeups. We assume all ETIME returns are valid.
4157 //
4158 // TODO: properly differentiate simultaneous notify+interrupt.
4159 // In that case, we should propagate the notify to another waiter.
4160
4161 while (_Event < 0) {
4162 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst);
4163 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4164 pthread_cond_destroy (_cond);
4165 pthread_cond_init (_cond, NULL) ;
4166 }
4167 assert_status(status == 0 || status == EINTR ||
4168 status == ETIMEDOUT,
4169 status, "cond_timedwait");
4170 if (!FilterSpuriousWakeups) break ; // previous semantics
4171 if (status == ETIMEDOUT) break ;
4172 // We consume and ignore EINTR and spurious wakeups.
4173 }
4174 --_nParked ;
4175 if (_Event >= 0) {
4176 ret = OS_OK;
4177 }
4178 _Event = 0 ;
4179 status = pthread_mutex_unlock(_mutex);
4180 assert_status(status == 0, status, "mutex_unlock");
4181 assert (_nParked == 0, "invariant") ;
4182 // Paranoia to ensure our locked and lock-free paths interact
4183 // correctly with each other.
4184 OrderAccess::fence();
4185 return ret;
4186 }
4187
4188 void os::PlatformEvent::unpark() {
4189 // Transitions for _Event:
4190 // 0 :=> 1
4191 // 1 :=> 1
4192 // -1 :=> either 0 or 1; must signal target thread
4193 // That is, we can safely transition _Event from -1 to either
4194 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4195 // unpark() calls.
4196 // See also: "Semaphores in Plan 9" by Mullender & Cox
4197 //
4198 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4199 // that it will take two back-to-back park() calls for the owning
4200 // thread to block. This has the benefit of forcing a spurious return
4201 // from the first park() call after an unpark() call which will help
4202 // shake out uses of park() and unpark() without condition variables.
4203
4204 if (Atomic::xchg(1, &_Event) >= 0) return;
4205
4206 // Wait for the thread associated with the event to vacate
4207 int status = pthread_mutex_lock(_mutex);
4208 assert_status(status == 0, status, "mutex_lock");
4209 int AnyWaiters = _nParked;
4210 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4211 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) {
4212 AnyWaiters = 0;
4213 pthread_cond_signal(_cond);
4214 }
4215 status = pthread_mutex_unlock(_mutex);
4216 assert_status(status == 0, status, "mutex_unlock");
4217 if (AnyWaiters != 0) {
4218 status = pthread_cond_signal(_cond);
4219 assert_status(status == 0, status, "cond_signal");
4220 }
4221
4222 // Note that we signal() _after dropping the lock for "immortal" Events.
4223 // This is safe and avoids a common class of futile wakeups. In rare
4224 // circumstances this can cause a thread to return prematurely from
4225 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4226 // simply re-test the condition and re-park itself.
4227 }
4228
4229
4230 // JSR166
4231 // -------------------------------------------------------
4232
4233 /*
4234 * The solaris and bsd implementations of park/unpark are fairly
4235 * conservative for now, but can be improved. They currently use a
4236 * mutex/condvar pair, plus a a count.
4237 * Park decrements count if > 0, else does a condvar wait. Unpark
4238 * sets count to 1 and signals condvar. Only one thread ever waits
4239 * on the condvar. Contention seen when trying to park implies that someone
4240 * is unparking you, so don't wait. And spurious returns are fine, so there
4241 * is no need to track notifications.
4242 */
4243
4244 #define MAX_SECS 100000000
4245 /*
4246 * This code is common to bsd and solaris and will be moved to a
4247 * common place in dolphin.
4248 *
4249 * The passed in time value is either a relative time in nanoseconds
4250 * or an absolute time in milliseconds. Either way it has to be unpacked
4251 * into suitable seconds and nanoseconds components and stored in the
4252 * given timespec structure.
4253 * Given time is a 64-bit value and the time_t used in the timespec is only
4254 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4255 * overflow if times way in the future are given. Further on Solaris versions
4256 * prior to 10 there is a restriction (see cond_timedwait) that the specified
4257 * number of seconds, in abstime, is less than current_time + 100,000,000.
4258 * As it will be 28 years before "now + 100000000" will overflow we can
4259 * ignore overflow and just impose a hard-limit on seconds using the value
4260 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
4261 * years from "now".
4262 */
4263
4264 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4265 assert (time > 0, "convertTime");
4266
4267 struct timeval now;
4268 int status = gettimeofday(&now, NULL);
4269 assert(status == 0, "gettimeofday");
4270
4271 time_t max_secs = now.tv_sec + MAX_SECS;
4272
4273 if (isAbsolute) {
4274 jlong secs = time / 1000;
4275 if (secs > max_secs) {
4276 absTime->tv_sec = max_secs;
4277 }
4278 else {
4279 absTime->tv_sec = secs;
4280 }
4281 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4282 }
4283 else {
4284 jlong secs = time / NANOSECS_PER_SEC;
4285 if (secs >= MAX_SECS) {
4286 absTime->tv_sec = max_secs;
4287 absTime->tv_nsec = 0;
4288 }
4289 else {
4290 absTime->tv_sec = now.tv_sec + secs;
4291 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4292 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4293 absTime->tv_nsec -= NANOSECS_PER_SEC;
4294 ++absTime->tv_sec; // note: this must be <= max_secs
4295 }
4296 }
4297 }
4298 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4299 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4300 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4301 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4302 }
4303
4304 void Parker::park(bool isAbsolute, jlong time) {
4305 // Ideally we'd do something useful while spinning, such
4306 // as calling unpackTime().
4307
4308 // Optional fast-path check:
4309 // Return immediately if a permit is available.
4310 // We depend on Atomic::xchg() having full barrier semantics
4311 // since we are doing a lock-free update to _counter.
4312 if (Atomic::xchg(0, &_counter) > 0) return;
4313
4314 Thread* thread = Thread::current();
4315 assert(thread->is_Java_thread(), "Must be JavaThread");
4316 JavaThread *jt = (JavaThread *)thread;
4317
4318 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4319 // Check interrupt before trying to wait
4320 if (Thread::is_interrupted(thread, false)) {
4321 return;
4322 }
4323
4324 // Next, demultiplex/decode time arguments
4325 struct timespec absTime;
4326 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
4327 return;
4328 }
4329 if (time > 0) {
4330 unpackTime(&absTime, isAbsolute, time);
4331 }
4332
4333
4334 // Enter safepoint region
4335 // Beware of deadlocks such as 6317397.
4336 // The per-thread Parker:: mutex is a classic leaf-lock.
4337 // In particular a thread must never block on the Threads_lock while
4338 // holding the Parker:: mutex. If safepoints are pending both the
4339 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4340 ThreadBlockInVM tbivm(jt);
4341
4342 // Don't wait if cannot get lock since interference arises from
4343 // unblocking. Also. check interrupt before trying wait
4344 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4345 return;
4346 }
4347
4348 int status ;
4349 if (_counter > 0) { // no wait needed
4350 _counter = 0;
4351 status = pthread_mutex_unlock(_mutex);
4352 assert (status == 0, "invariant") ;
4353 // Paranoia to ensure our locked and lock-free paths interact
4354 // correctly with each other and Java-level accesses.
4355 OrderAccess::fence();
4356 return;
4357 }
4358
4359 #ifdef ASSERT
4360 // Don't catch signals while blocked; let the running threads have the signals.
4361 // (This allows a debugger to break into the running thread.)
4362 sigset_t oldsigs;
4363 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4364 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4365 #endif
4366
4367 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4368 jt->set_suspend_equivalent();
4369 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4370
4371 if (time == 0) {
4372 status = pthread_cond_wait (_cond, _mutex) ;
4373 } else {
4374 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ;
4375 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4376 pthread_cond_destroy (_cond) ;
4377 pthread_cond_init (_cond, NULL);
4378 }
4379 }
4380 assert_status(status == 0 || status == EINTR ||
4381 status == ETIMEDOUT,
4382 status, "cond_timedwait");
4383
4384 #ifdef ASSERT
4385 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4386 #endif
4387
4388 _counter = 0 ;
4389 status = pthread_mutex_unlock(_mutex) ;
4390 assert_status(status == 0, status, "invariant") ;
4391 // Paranoia to ensure our locked and lock-free paths interact
4392 // correctly with each other and Java-level accesses.
4393 OrderAccess::fence();
4394
4395 // If externally suspended while waiting, re-suspend
4396 if (jt->handle_special_suspend_equivalent_condition()) {
4397 jt->java_suspend_self();
4398 }
4399 }
4400
4401 void Parker::unpark() {
4402 int s, status ;
4403 status = pthread_mutex_lock(_mutex);
4404 assert (status == 0, "invariant") ;
4405 s = _counter;
4406 _counter = 1;
4407 if (s < 1) {
4408 if (WorkAroundNPTLTimedWaitHang) {
4409 status = pthread_cond_signal (_cond) ;
4410 assert (status == 0, "invariant") ;
4411 status = pthread_mutex_unlock(_mutex);
4412 assert (status == 0, "invariant") ;
4413 } else {
4414 status = pthread_mutex_unlock(_mutex);
4415 assert (status == 0, "invariant") ;
4416 status = pthread_cond_signal (_cond) ;
4417 assert (status == 0, "invariant") ;
4418 }
4419 } else {
4420 pthread_mutex_unlock(_mutex);
4421 assert (status == 0, "invariant") ;
4422 }
4423 }
4424
4425
4426 /* Darwin has no "environ" in a dynamic library. */
4427 #ifdef __APPLE__
4428 #include <crt_externs.h>
4429 #define environ (*_NSGetEnviron())
4430 #else
4431 extern char** environ;
4432 #endif
4433
4434 // Run the specified command in a separate process. Return its exit value,
4435 // or -1 on failure (e.g. can't fork a new process).
4436 // Unlike system(), this function can be called from signal handler. It
4437 // doesn't block SIGINT et al.
4438 int os::fork_and_exec(char* cmd) {
4439 const char * argv[4] = {"sh", "-c", cmd, NULL};
4440
4441 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4442 // pthread_atfork handlers and reset pthread library. All we need is a
4443 // separate process to execve. Make a direct syscall to fork process.
4444 // On IA64 there's no fork syscall, we have to use fork() and hope for
4445 // the best...
4446 pid_t pid = fork();
4447
4448 if (pid < 0) {
4449 // fork failed
4450 return -1;
4451
4452 } else if (pid == 0) {
4453 // child process
4454
4455 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4456 // first to kill every thread on the thread list. Because this list is
4457 // not reset by fork() (see notes above), execve() will instead kill
4458 // every thread in the parent process. We know this is the only thread
4459 // in the new process, so make a system call directly.
4460 // IA64 should use normal execve() from glibc to match the glibc fork()
4461 // above.
4462 execve("/bin/sh", (char* const*)argv, environ);
4463
4464 // execve failed
4465 _exit(-1);
4466
4467 } else {
4468 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4469 // care about the actual exit code, for now.
4470
4471 int status;
4472
4473 // Wait for the child process to exit. This returns immediately if
4474 // the child has already exited. */
4475 while (waitpid(pid, &status, 0) < 0) {
4476 switch (errno) {
4477 case ECHILD: return 0;
4478 case EINTR: break;
4479 default: return -1;
4480 }
4481 }
4482
4483 if (WIFEXITED(status)) {
4484 // The child exited normally; get its exit code.
4485 return WEXITSTATUS(status);
4486 } else if (WIFSIGNALED(status)) {
4487 // The child exited because of a signal
4488 // The best value to return is 0x80 + signal number,
4489 // because that is what all Unix shells do, and because
4490 // it allows callers to distinguish between process exit and
4491 // process death by signal.
4492 return 0x80 + WTERMSIG(status);
4493 } else {
4494 // Unknown exit code; pass it through
4495 return status;
4496 }
4497 }
4498 }
4499
4500 // is_headless_jre()
4501 //
4502 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4503 // in order to report if we are running in a headless jre
4504 //
4505 // Since JDK8 xawt/libmawt.so was moved into the same directory
4506 // as libawt.so, and renamed libawt_xawt.so
4507 //
4508 bool os::is_headless_jre() {
4509 struct stat statbuf;
4510 char buf[MAXPATHLEN];
4511 char libmawtpath[MAXPATHLEN];
4512 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4513 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4514 char *p;
4515
4516 // Get path to libjvm.so
4517 os::jvm_path(buf, sizeof(buf));
4518
4519 // Get rid of libjvm.so
4520 p = strrchr(buf, '/');
4521 if (p == NULL) return false;
4522 else *p = '\0';
4523
4524 // Get rid of client or server
4525 p = strrchr(buf, '/');
4526 if (p == NULL) return false;
4527 else *p = '\0';
4528
4529 // check xawt/libmawt.so
4530 strcpy(libmawtpath, buf);
4531 strcat(libmawtpath, xawtstr);
4532 if (::stat(libmawtpath, &statbuf) == 0) return false;
4533
4534 // check libawt_xawt.so
4535 strcpy(libmawtpath, buf);
4536 strcat(libmawtpath, new_xawtstr);
4537 if (::stat(libmawtpath, &statbuf) == 0) return false;
4538
4539 return true;
4540 }
4541
4542 // Get the default path to the core file
4543 // Returns the length of the string
4544 int os::get_core_path(char* buffer, size_t bufferSize) {
4545 int n = jio_snprintf(buffer, bufferSize, "/cores");
4546
4547 // Truncate if theoretical string was longer than bufferSize
4548 n = MIN2(n, (int)bufferSize);
4549
4550 return n;
4551 }