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/memTracker.hpp"
61 #include "services/runtimeService.hpp"
62 #include "utilities/decoder.hpp"
63 #include "utilities/defaultStream.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/growableArray.hpp"
66 #include "utilities/vmError.hpp"
67
68 // put OS-includes here
69 # include <sys/types.h>
70 # include <sys/mman.h>
71 # include <sys/stat.h>
72 # include <sys/select.h>
73 # include <pthread.h>
74 # include <signal.h>
75 # include <errno.h>
76 # include <dlfcn.h>
77 # include <stdio.h>
78 # include <unistd.h>
79 # include <sys/resource.h>
80 # include <pthread.h>
81 # include <sys/stat.h>
82 # include <sys/time.h>
83 # include <sys/times.h>
84 # include <sys/utsname.h>
85 # include <sys/socket.h>
86 # include <sys/wait.h>
87 # include <time.h>
88 # include <pwd.h>
89 # include <poll.h>
90 # include <semaphore.h>
91 # include <fcntl.h>
92 # include <string.h>
93 # include <sys/param.h>
94 # include <sys/sysctl.h>
95 # include <sys/ipc.h>
96 # include <sys/shm.h>
97 #ifndef __APPLE__
98 # include <link.h>
99 #endif
100 # include <stdint.h>
101 # include <inttypes.h>
102 # include <sys/ioctl.h>
103
104 #if defined(__FreeBSD__) || defined(__NetBSD__)
105 # include <elf.h>
106 #endif
107
108 #ifdef __APPLE__
109 # include <mach/mach.h> // semaphore_* API
110 # include <mach-o/dyld.h>
111 # include <sys/proc_info.h>
112 # include <objc/objc-auto.h>
113 #endif
114
115 #ifndef MAP_ANONYMOUS
116 #define MAP_ANONYMOUS MAP_ANON
117 #endif
118
119 #define MAX_PATH (2 * K)
120
121 // for timer info max values which include all bits
122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
123
124 #define LARGEPAGES_BIT (1 << 6)
125 ////////////////////////////////////////////////////////////////////////////////
126 // global variables
127 julong os::Bsd::_physical_memory = 0;
128
129
130 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
131 pthread_t os::Bsd::_main_thread;
132 int os::Bsd::_page_size = -1;
133
134 static jlong initial_time_count=0;
135
136 static int clock_tics_per_sec = 100;
137
138 // For diagnostics to print a message once. see run_periodic_checks
139 static sigset_t check_signal_done;
140 static bool check_signals = true;
141
142 static pid_t _initial_pid = 0;
143
144 /* Signal number used to suspend/resume a thread */
145
146 /* do not use any signal number less than SIGSEGV, see 4355769 */
147 static int SR_signum = SIGUSR2;
148 sigset_t SR_sigset;
149
150
151 ////////////////////////////////////////////////////////////////////////////////
152 // utility functions
153
154 static int SR_initialize();
155
156 julong os::available_memory() {
157 return Bsd::available_memory();
158 }
159
160 // available here means free
161 julong os::Bsd::available_memory() {
162 uint64_t available = physical_memory() >> 2;
163 #ifdef __APPLE__
164 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
165 vm_statistics64_data_t vmstat;
166 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, (host_info64_t)&vmstat, &count);
167 if (kerr == KERN_SUCCESS) {
168 available = vmstat.free_count * os::vm_page_size();
169 }
170 #endif
171 return available;
172 }
173
174 julong os::physical_memory() {
175 return Bsd::physical_memory();
176 }
177
178 ////////////////////////////////////////////////////////////////////////////////
179 // environment support
180
181 bool os::getenv(const char* name, char* buf, int len) {
182 const char* val = ::getenv(name);
183 if (val != NULL && strlen(val) < (size_t)len) {
184 strcpy(buf, val);
185 return true;
186 }
187 if (len > 0) buf[0] = 0; // return a null string
188 return false;
189 }
190
191
192 // Return true if user is running as root.
193
194 bool os::have_special_privileges() {
195 static bool init = false;
196 static bool privileges = false;
197 if (!init) {
198 privileges = (getuid() != geteuid()) || (getgid() != getegid());
199 init = true;
200 }
201 return privileges;
202 }
203
204
205
206 // Cpu architecture string
207 #if defined(ZERO)
208 static char cpu_arch[] = ZERO_LIBARCH;
209 #elif defined(IA64)
210 static char cpu_arch[] = "ia64";
211 #elif defined(IA32)
212 static char cpu_arch[] = "i386";
213 #elif defined(AMD64)
214 static char cpu_arch[] = "amd64";
215 #elif defined(ARM)
216 static char cpu_arch[] = "arm";
217 #elif defined(PPC)
218 static char cpu_arch[] = "ppc";
219 #elif defined(SPARC)
220 # ifdef _LP64
221 static char cpu_arch[] = "sparcv9";
222 # else
223 static char cpu_arch[] = "sparc";
224 # endif
225 #else
226 #error Add appropriate cpu_arch setting
227 #endif
228
229 // Compiler variant
230 #ifdef COMPILER2
231 #define COMPILER_VARIANT "server"
232 #else
233 #define COMPILER_VARIANT "client"
234 #endif
235
236
237 void os::Bsd::initialize_system_info() {
238 int mib[2];
239 size_t len;
240 int cpu_val;
241 julong mem_val;
242
243 /* get processors count via hw.ncpus sysctl */
244 mib[0] = CTL_HW;
245 mib[1] = HW_NCPU;
246 len = sizeof(cpu_val);
247 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
248 assert(len == sizeof(cpu_val), "unexpected data size");
249 set_processor_count(cpu_val);
250 }
251 else {
252 set_processor_count(1); // fallback
253 }
254
255 /* get physical memory via hw.memsize sysctl (hw.memsize is used
256 * since it returns a 64 bit value)
257 */
258 mib[0] = CTL_HW;
259 mib[1] = HW_MEMSIZE;
260 len = sizeof(mem_val);
261 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
262 assert(len == sizeof(mem_val), "unexpected data size");
263 _physical_memory = mem_val;
264 } else {
265 _physical_memory = 256*1024*1024; // fallback (XXXBSD?)
266 }
267
268 #ifdef __OpenBSD__
269 {
270 // limit _physical_memory memory view on OpenBSD since
271 // datasize rlimit restricts us anyway.
272 struct rlimit limits;
273 getrlimit(RLIMIT_DATA, &limits);
274 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
275 }
276 #endif
277 }
278
279 #ifdef __APPLE__
280 static const char *get_home() {
281 const char *home_dir = ::getenv("HOME");
282 if ((home_dir == NULL) || (*home_dir == '\0')) {
283 struct passwd *passwd_info = getpwuid(geteuid());
284 if (passwd_info != NULL) {
285 home_dir = passwd_info->pw_dir;
286 }
287 }
288
289 return home_dir;
290 }
291 #endif
292
293 void os::init_system_properties_values() {
294 // char arch[12];
295 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
296
297 // The next steps are taken in the product version:
298 //
299 // Obtain the JAVA_HOME value from the location of libjvm.so.
300 // This library should be located at:
301 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
302 //
303 // If "/jre/lib/" appears at the right place in the path, then we
304 // assume libjvm.so is installed in a JDK and we use this path.
305 //
306 // Otherwise exit with message: "Could not create the Java virtual machine."
307 //
308 // The following extra steps are taken in the debugging version:
309 //
310 // If "/jre/lib/" does NOT appear at the right place in the path
311 // instead of exit check for $JAVA_HOME environment variable.
312 //
313 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
314 // then we append a fake suffix "hotspot/libjvm.so" to this path so
315 // it looks like libjvm.so is installed there
316 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
317 //
318 // Otherwise exit.
319 //
320 // Important note: if the location of libjvm.so changes this
321 // code needs to be changed accordingly.
322
323 // The next few definitions allow the code to be verbatim:
324 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
325 #define getenv(n) ::getenv(n)
326
327 /*
328 * See ld(1):
329 * The linker uses the following search paths to locate required
330 * shared libraries:
331 * 1: ...
332 * ...
333 * 7: The default directories, normally /lib and /usr/lib.
334 */
335 #ifndef DEFAULT_LIBPATH
336 #define DEFAULT_LIBPATH "/lib:/usr/lib"
337 #endif
338
339 #define EXTENSIONS_DIR "/lib/ext"
340 #define ENDORSED_DIR "/lib/endorsed"
341 #define REG_DIR "/usr/java/packages"
342
343 #ifdef __APPLE__
344 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
345 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
346 const char *user_home_dir = get_home();
347 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir
348 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
349 sizeof(SYS_EXTENSIONS_DIRS);
350 #endif
351
352 {
353 /* sysclasspath, java_home, dll_dir */
354 {
355 char *home_path;
356 char *dll_path;
357 char *pslash;
358 char buf[MAXPATHLEN];
359 os::jvm_path(buf, sizeof(buf));
360
361 // Found the full path to libjvm.so.
362 // Now cut the path to <java_home>/jre if we can.
363 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
364 pslash = strrchr(buf, '/');
365 if (pslash != NULL)
366 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
367 dll_path = malloc(strlen(buf) + 1);
368 if (dll_path == NULL)
369 return;
370 strcpy(dll_path, buf);
371 Arguments::set_dll_dir(dll_path);
372
373 if (pslash != NULL) {
374 pslash = strrchr(buf, '/');
375 if (pslash != NULL) {
376 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */
377 #ifndef __APPLE__
378 pslash = strrchr(buf, '/');
379 if (pslash != NULL)
380 *pslash = '\0'; /* get rid of /lib */
381 #endif
382 }
383 }
384
385 home_path = malloc(strlen(buf) + 1);
386 if (home_path == NULL)
387 return;
388 strcpy(home_path, buf);
389 Arguments::set_java_home(home_path);
390
391 if (!set_boot_path('/', ':'))
392 return;
393 }
394
395 /*
396 * Where to look for native libraries
397 *
398 * Note: Due to a legacy implementation, most of the library path
399 * is set in the launcher. This was to accomodate linking restrictions
400 * on legacy Bsd implementations (which are no longer supported).
401 * Eventually, all the library path setting will be done here.
402 *
403 * However, to prevent the proliferation of improperly built native
404 * libraries, the new path component /usr/java/packages is added here.
405 * Eventually, all the library path setting will be done here.
406 */
407 {
408 char *ld_library_path;
409
410 /*
411 * Construct the invariant part of ld_library_path. Note that the
412 * space for the colon and the trailing null are provided by the
413 * nulls included by the sizeof operator (so actually we allocate
414 * a byte more than necessary).
415 */
416 #ifdef __APPLE__
417 ld_library_path = (char *) malloc(system_ext_size);
418 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);
419 #else
420 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
421 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
422 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
423 #endif
424
425 /*
426 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It
427 * should always exist (until the legacy problem cited above is
428 * addressed).
429 */
430 #ifdef __APPLE__
431 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper
432 char *l = getenv("JAVA_LIBRARY_PATH");
433 if (l != NULL) {
434 char *t = ld_library_path;
435 /* That's +1 for the colon and +1 for the trailing '\0' */
436 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);
437 sprintf(ld_library_path, "%s:%s", l, t);
438 free(t);
439 }
440
441 char *v = getenv("DYLD_LIBRARY_PATH");
442 #else
443 char *v = getenv("LD_LIBRARY_PATH");
444 #endif
445 if (v != NULL) {
446 char *t = ld_library_path;
447 /* That's +1 for the colon and +1 for the trailing '\0' */
448 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
449 sprintf(ld_library_path, "%s:%s", v, t);
450 free(t);
451 }
452
453 #ifdef __APPLE__
454 // Apple's Java6 has "." at the beginning of java.library.path.
455 // OpenJDK on Windows has "." at the end of java.library.path.
456 // OpenJDK on Linux and Solaris don't have "." in java.library.path
457 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
458 // "." is appended to the end of java.library.path. Yes, this
459 // could cause a change in behavior, but Apple's Java6 behavior
460 // can be achieved by putting "." at the beginning of the
461 // JAVA_LIBRARY_PATH environment variable.
462 {
463 char *t = ld_library_path;
464 // that's +3 for appending ":." and the trailing '\0'
465 ld_library_path = (char *) malloc(strlen(t) + 3);
466 sprintf(ld_library_path, "%s:%s", t, ".");
467 free(t);
468 }
469 #endif
470
471 Arguments::set_library_path(ld_library_path);
472 }
473
474 /*
475 * Extensions directories.
476 *
477 * Note that the space for the colon and the trailing null are provided
478 * by the nulls included by the sizeof operator (so actually one byte more
479 * than necessary is allocated).
480 */
481 {
482 #ifdef __APPLE__
483 char *buf = malloc(strlen(Arguments::get_java_home()) +
484 sizeof(EXTENSIONS_DIR) + system_ext_size);
485 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"
486 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());
487 #else
488 char *buf = malloc(strlen(Arguments::get_java_home()) +
489 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
490 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
491 Arguments::get_java_home());
492 #endif
493
494 Arguments::set_ext_dirs(buf);
495 }
496
497 /* Endorsed standards default directory. */
498 {
499 char * buf;
500 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
501 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
502 Arguments::set_endorsed_dirs(buf);
503 }
504 }
505
506 #ifdef __APPLE__
507 #undef SYS_EXTENSIONS_DIR
508 #endif
509 #undef malloc
510 #undef getenv
511 #undef EXTENSIONS_DIR
512 #undef ENDORSED_DIR
513
514 // Done
515 return;
516 }
517
518 ////////////////////////////////////////////////////////////////////////////////
519 // breakpoint support
520
521 void os::breakpoint() {
522 BREAKPOINT;
523 }
524
525 extern "C" void breakpoint() {
526 // use debugger to set breakpoint here
527 }
528
529 ////////////////////////////////////////////////////////////////////////////////
530 // signal support
531
532 debug_only(static bool signal_sets_initialized = false);
533 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
534
535 bool os::Bsd::is_sig_ignored(int sig) {
536 struct sigaction oact;
537 sigaction(sig, (struct sigaction*)NULL, &oact);
538 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
539 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
540 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
541 return true;
542 else
543 return false;
544 }
545
546 void os::Bsd::signal_sets_init() {
547 // Should also have an assertion stating we are still single-threaded.
548 assert(!signal_sets_initialized, "Already initialized");
549 // Fill in signals that are necessarily unblocked for all threads in
550 // the VM. Currently, we unblock the following signals:
551 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
552 // by -Xrs (=ReduceSignalUsage));
553 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
554 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
555 // the dispositions or masks wrt these signals.
556 // Programs embedding the VM that want to use the above signals for their
557 // own purposes must, at this time, use the "-Xrs" option to prevent
558 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
559 // (See bug 4345157, and other related bugs).
560 // In reality, though, unblocking these signals is really a nop, since
561 // these signals are not blocked by default.
562 sigemptyset(&unblocked_sigs);
563 sigemptyset(&allowdebug_blocked_sigs);
564 sigaddset(&unblocked_sigs, SIGILL);
565 sigaddset(&unblocked_sigs, SIGSEGV);
566 sigaddset(&unblocked_sigs, SIGBUS);
567 sigaddset(&unblocked_sigs, SIGFPE);
568 sigaddset(&unblocked_sigs, SR_signum);
569
570 if (!ReduceSignalUsage) {
571 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
572 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
573 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
574 }
575 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
576 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
577 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
578 }
579 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
580 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
581 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
582 }
583 }
584 // Fill in signals that are blocked by all but the VM thread.
585 sigemptyset(&vm_sigs);
586 if (!ReduceSignalUsage)
587 sigaddset(&vm_sigs, BREAK_SIGNAL);
588 debug_only(signal_sets_initialized = true);
589
590 }
591
592 // These are signals that are unblocked while a thread is running Java.
593 // (For some reason, they get blocked by default.)
594 sigset_t* os::Bsd::unblocked_signals() {
595 assert(signal_sets_initialized, "Not initialized");
596 return &unblocked_sigs;
597 }
598
599 // These are the signals that are blocked while a (non-VM) thread is
600 // running Java. Only the VM thread handles these signals.
601 sigset_t* os::Bsd::vm_signals() {
602 assert(signal_sets_initialized, "Not initialized");
603 return &vm_sigs;
604 }
605
606 // These are signals that are blocked during cond_wait to allow debugger in
607 sigset_t* os::Bsd::allowdebug_blocked_signals() {
608 assert(signal_sets_initialized, "Not initialized");
609 return &allowdebug_blocked_sigs;
610 }
611
612 void os::Bsd::hotspot_sigmask(Thread* thread) {
613
614 //Save caller's signal mask before setting VM signal mask
615 sigset_t caller_sigmask;
616 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
617
618 OSThread* osthread = thread->osthread();
619 osthread->set_caller_sigmask(caller_sigmask);
620
621 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
622
623 if (!ReduceSignalUsage) {
624 if (thread->is_VM_thread()) {
625 // Only the VM thread handles BREAK_SIGNAL ...
626 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
627 } else {
628 // ... all other threads block BREAK_SIGNAL
629 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
630 }
631 }
632 }
633
634
635 //////////////////////////////////////////////////////////////////////////////
636 // create new thread
637
638 // check if it's safe to start a new thread
639 static bool _thread_safety_check(Thread* thread) {
640 return true;
641 }
642
643 #ifdef __APPLE__
644 // library handle for calling objc_registerThreadWithCollector()
645 // without static linking to the libobjc library
646 #define OBJC_LIB "/usr/lib/libobjc.dylib"
647 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
648 typedef void (*objc_registerThreadWithCollector_t)();
649 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
650 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
651 #endif
652
653 #ifdef __APPLE__
654 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
655 // Additional thread_id used to correlate threads in SA
656 thread_identifier_info_data_t m_ident_info;
657 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
658
659 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
660 (thread_info_t) &m_ident_info, &count);
661
662 return m_ident_info.thread_id;
663 }
664 #endif
665
666 // Thread start routine for all newly created threads
667 static void *java_start(Thread *thread) {
668 // Try to randomize the cache line index of hot stack frames.
669 // This helps when threads of the same stack traces evict each other's
670 // cache lines. The threads can be either from the same JVM instance, or
671 // from different JVM instances. The benefit is especially true for
672 // processors with hyperthreading technology.
673 static int counter = 0;
674 int pid = os::current_process_id();
675 alloca(((pid ^ counter++) & 7) * 128);
676
677 ThreadLocalStorage::set_thread(thread);
678
679 OSThread* osthread = thread->osthread();
680 Monitor* sync = osthread->startThread_lock();
681
682 // non floating stack BsdThreads needs extra check, see above
683 if (!_thread_safety_check(thread)) {
684 // notify parent thread
685 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
686 osthread->set_state(ZOMBIE);
687 sync->notify_all();
688 return NULL;
689 }
690
691 #ifdef __APPLE__
692 // thread_id is mach thread on macos, which pthreads graciously caches and provides for us
693 mach_port_t thread_id = ::pthread_mach_thread_np(::pthread_self());
694 guarantee(thread_id != 0, "thread id missing from pthreads");
695 osthread->set_thread_id(thread_id);
696
697 uint64_t unique_thread_id = locate_unique_thread_id(thread_id);
698 guarantee(unique_thread_id != 0, "unique thread id was not found");
699 osthread->set_unique_thread_id(unique_thread_id);
700 #else
701 // thread_id is pthread_id on BSD
702 osthread->set_thread_id(::pthread_self());
703 #endif
704 // initialize signal mask for this thread
705 os::Bsd::hotspot_sigmask(thread);
706
707 // initialize floating point control register
708 os::Bsd::init_thread_fpu_state();
709
710 #ifdef __APPLE__
711 // register thread with objc gc
712 if (objc_registerThreadWithCollectorFunction != NULL) {
713 objc_registerThreadWithCollectorFunction();
714 }
715 #endif
716
717 // handshaking with parent thread
718 {
719 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
720
721 // notify parent thread
722 osthread->set_state(INITIALIZED);
723 sync->notify_all();
724
725 // wait until os::start_thread()
726 while (osthread->get_state() == INITIALIZED) {
727 sync->wait(Mutex::_no_safepoint_check_flag);
728 }
729 }
730
731 // call one more level start routine
732 thread->run();
733
734 return 0;
735 }
736
737 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
738 assert(thread->osthread() == NULL, "caller responsible");
739
740 // Allocate the OSThread object
741 OSThread* osthread = new OSThread(NULL, NULL);
742 if (osthread == NULL) {
743 return false;
744 }
745
746 // set the correct thread state
747 osthread->set_thread_type(thr_type);
748
749 // Initial state is ALLOCATED but not INITIALIZED
750 osthread->set_state(ALLOCATED);
751
752 thread->set_osthread(osthread);
753
754 // init thread attributes
755 pthread_attr_t attr;
756 pthread_attr_init(&attr);
757 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
758
759 // stack size
760 if (os::Bsd::supports_variable_stack_size()) {
761 // calculate stack size if it's not specified by caller
762 if (stack_size == 0) {
763 stack_size = os::Bsd::default_stack_size(thr_type);
764
765 switch (thr_type) {
766 case os::java_thread:
767 // Java threads use ThreadStackSize which default value can be
768 // changed with the flag -Xss
769 assert (JavaThread::stack_size_at_create() > 0, "this should be set");
770 stack_size = JavaThread::stack_size_at_create();
771 break;
772 case os::compiler_thread:
773 if (CompilerThreadStackSize > 0) {
774 stack_size = (size_t)(CompilerThreadStackSize * K);
775 break;
776 } // else fall through:
777 // use VMThreadStackSize if CompilerThreadStackSize is not defined
778 case os::vm_thread:
779 case os::pgc_thread:
780 case os::cgc_thread:
781 case os::watcher_thread:
782 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
783 break;
784 }
785 }
786
787 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
788 pthread_attr_setstacksize(&attr, stack_size);
789 } else {
790 // let pthread_create() pick the default value.
791 }
792
793 ThreadState state;
794
795 {
796 pthread_t tid;
797 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
798
799 pthread_attr_destroy(&attr);
800
801 if (ret != 0) {
802 if (PrintMiscellaneous && (Verbose || WizardMode)) {
803 perror("pthread_create()");
804 }
805 // Need to clean up stuff we've allocated so far
806 thread->set_osthread(NULL);
807 delete osthread;
808 return false;
809 }
810
811 // Store pthread info into the OSThread
812 osthread->set_pthread_id(tid);
813
814 // Wait until child thread is either initialized or aborted
815 {
816 Monitor* sync_with_child = osthread->startThread_lock();
817 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
818 while ((state = osthread->get_state()) == ALLOCATED) {
819 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
820 }
821 }
822
823 }
824
825 // Aborted due to thread limit being reached
826 if (state == ZOMBIE) {
827 thread->set_osthread(NULL);
828 delete osthread;
829 return false;
830 }
831
832 // The thread is returned suspended (in state INITIALIZED),
833 // and is started higher up in the call chain
834 assert(state == INITIALIZED, "race condition");
835 return true;
836 }
837
838 /////////////////////////////////////////////////////////////////////////////
839 // attach existing thread
840
841 // bootstrap the main thread
842 bool os::create_main_thread(JavaThread* thread) {
843 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
844 return create_attached_thread(thread);
845 }
846
847 bool os::create_attached_thread(JavaThread* thread) {
848 #ifdef ASSERT
849 thread->verify_not_published();
850 #endif
851
852 // Allocate the OSThread object
853 OSThread* osthread = new OSThread(NULL, NULL);
854
855 if (osthread == NULL) {
856 return false;
857 }
858
859 // Store pthread info into the OSThread
860 #ifdef __APPLE__
861 // thread_id is mach thread on macos, which pthreads graciously caches and provides for us
862 mach_port_t thread_id = ::pthread_mach_thread_np(::pthread_self());
863 guarantee(thread_id != 0, "just checking");
864 osthread->set_thread_id(thread_id);
865
866 uint64_t unique_thread_id = locate_unique_thread_id(thread_id);
867 guarantee(unique_thread_id != 0, "just checking");
868 osthread->set_unique_thread_id(unique_thread_id);
869 #else
870 osthread->set_thread_id(::pthread_self());
871 #endif
872 osthread->set_pthread_id(::pthread_self());
873
874 // initialize floating point control register
875 os::Bsd::init_thread_fpu_state();
876
877 // Initial thread state is RUNNABLE
878 osthread->set_state(RUNNABLE);
879
880 thread->set_osthread(osthread);
881
882 // initialize signal mask for this thread
883 // and save the caller's signal mask
884 os::Bsd::hotspot_sigmask(thread);
885
886 return true;
887 }
888
889 void os::pd_start_thread(Thread* thread) {
890 OSThread * osthread = thread->osthread();
891 assert(osthread->get_state() != INITIALIZED, "just checking");
892 Monitor* sync_with_child = osthread->startThread_lock();
893 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
894 sync_with_child->notify();
895 }
896
897 // Free Bsd resources related to the OSThread
898 void os::free_thread(OSThread* osthread) {
899 assert(osthread != NULL, "osthread not set");
900
901 if (Thread::current()->osthread() == osthread) {
902 // Restore caller's signal mask
903 sigset_t sigmask = osthread->caller_sigmask();
904 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
905 }
906
907 delete osthread;
908 }
909
910 //////////////////////////////////////////////////////////////////////////////
911 // thread local storage
912
913 int os::allocate_thread_local_storage() {
914 pthread_key_t key;
915 int rslt = pthread_key_create(&key, NULL);
916 assert(rslt == 0, "cannot allocate thread local storage");
917 return (int)key;
918 }
919
920 // Note: This is currently not used by VM, as we don't destroy TLS key
921 // on VM exit.
922 void os::free_thread_local_storage(int index) {
923 int rslt = pthread_key_delete((pthread_key_t)index);
924 assert(rslt == 0, "invalid index");
925 }
926
927 void os::thread_local_storage_at_put(int index, void* value) {
928 int rslt = pthread_setspecific((pthread_key_t)index, value);
929 assert(rslt == 0, "pthread_setspecific failed");
930 }
931
932 extern "C" Thread* get_thread() {
933 return ThreadLocalStorage::thread();
934 }
935
936
937 ////////////////////////////////////////////////////////////////////////////////
938 // time support
939
940 // Time since start-up in seconds to a fine granularity.
941 // Used by VMSelfDestructTimer and the MemProfiler.
942 double os::elapsedTime() {
943
944 return (double)(os::elapsed_counter()) * 0.000001;
945 }
946
947 jlong os::elapsed_counter() {
948 timeval time;
949 int status = gettimeofday(&time, NULL);
950 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
951 }
952
953 jlong os::elapsed_frequency() {
954 return (1000 * 1000);
955 }
956
957 bool os::supports_vtime() { return true; }
958 bool os::enable_vtime() { return false; }
959 bool os::vtime_enabled() { return false; }
960
961 double os::elapsedVTime() {
962 // better than nothing, but not much
963 return elapsedTime();
964 }
965
966 jlong os::javaTimeMillis() {
967 timeval time;
968 int status = gettimeofday(&time, NULL);
969 assert(status != -1, "bsd error");
970 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
971 }
972
973 #ifndef CLOCK_MONOTONIC
974 #define CLOCK_MONOTONIC (1)
975 #endif
976
977 #ifdef __APPLE__
978 void os::Bsd::clock_init() {
979 // XXXDARWIN: Investigate replacement monotonic clock
980 }
981 #else
982 void os::Bsd::clock_init() {
983 struct timespec res;
984 struct timespec tp;
985 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
986 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
987 // yes, monotonic clock is supported
988 _clock_gettime = ::clock_gettime;
989 }
990 }
991 #endif
992
993
994 jlong os::javaTimeNanos() {
995 if (Bsd::supports_monotonic_clock()) {
996 struct timespec tp;
997 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp);
998 assert(status == 0, "gettime error");
999 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
1000 return result;
1001 } else {
1002 timeval time;
1003 int status = gettimeofday(&time, NULL);
1004 assert(status != -1, "bsd error");
1005 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1006 return 1000 * usecs;
1007 }
1008 }
1009
1010 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1011 if (Bsd::supports_monotonic_clock()) {
1012 info_ptr->max_value = ALL_64_BITS;
1013
1014 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1015 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1016 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1017 } else {
1018 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1019 info_ptr->max_value = ALL_64_BITS;
1020
1021 // gettimeofday is a real time clock so it skips
1022 info_ptr->may_skip_backward = true;
1023 info_ptr->may_skip_forward = true;
1024 }
1025
1026 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1027 }
1028
1029 // Return the real, user, and system times in seconds from an
1030 // arbitrary fixed point in the past.
1031 bool os::getTimesSecs(double* process_real_time,
1032 double* process_user_time,
1033 double* process_system_time) {
1034 struct tms ticks;
1035 clock_t real_ticks = times(&ticks);
1036
1037 if (real_ticks == (clock_t) (-1)) {
1038 return false;
1039 } else {
1040 double ticks_per_second = (double) clock_tics_per_sec;
1041 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1042 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1043 *process_real_time = ((double) real_ticks) / ticks_per_second;
1044
1045 return true;
1046 }
1047 }
1048
1049
1050 char * os::local_time_string(char *buf, size_t buflen) {
1051 struct tm t;
1052 time_t long_time;
1053 time(&long_time);
1054 localtime_r(&long_time, &t);
1055 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1056 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1057 t.tm_hour, t.tm_min, t.tm_sec);
1058 return buf;
1059 }
1060
1061 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1062 return localtime_r(clock, res);
1063 }
1064
1065 ////////////////////////////////////////////////////////////////////////////////
1066 // runtime exit support
1067
1068 // Note: os::shutdown() might be called very early during initialization, or
1069 // called from signal handler. Before adding something to os::shutdown(), make
1070 // sure it is async-safe and can handle partially initialized VM.
1071 void os::shutdown() {
1072
1073 // allow PerfMemory to attempt cleanup of any persistent resources
1074 perfMemory_exit();
1075
1076 // needs to remove object in file system
1077 AttachListener::abort();
1078
1079 // flush buffered output, finish log files
1080 ostream_abort();
1081
1082 // Check for abort hook
1083 abort_hook_t abort_hook = Arguments::abort_hook();
1084 if (abort_hook != NULL) {
1085 abort_hook();
1086 }
1087
1088 }
1089
1090 // Note: os::abort() might be called very early during initialization, or
1091 // called from signal handler. Before adding something to os::abort(), make
1092 // sure it is async-safe and can handle partially initialized VM.
1093 void os::abort(bool dump_core) {
1094 os::shutdown();
1095 if (dump_core) {
1096 #ifndef PRODUCT
1097 fdStream out(defaultStream::output_fd());
1098 out.print_raw("Current thread is ");
1099 char buf[16];
1100 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1101 out.print_raw_cr(buf);
1102 out.print_raw_cr("Dumping core ...");
1103 #endif
1104 ::abort(); // dump core
1105 }
1106
1107 ::exit(1);
1108 }
1109
1110 // Die immediately, no exit hook, no abort hook, no cleanup.
1111 void os::die() {
1112 // _exit() on BsdThreads only kills current thread
1113 ::abort();
1114 }
1115
1116 // unused on bsd for now.
1117 void os::set_error_file(const char *logfile) {}
1118
1119
1120 // This method is a copy of JDK's sysGetLastErrorString
1121 // from src/solaris/hpi/src/system_md.c
1122
1123 size_t os::lasterror(char *buf, size_t len) {
1124
1125 if (errno == 0) return 0;
1126
1127 const char *s = ::strerror(errno);
1128 size_t n = ::strlen(s);
1129 if (n >= len) {
1130 n = len - 1;
1131 }
1132 ::strncpy(buf, s, n);
1133 buf[n] = '\0';
1134 return n;
1135 }
1136
1137 intx os::current_thread_id() {
1138 #ifdef __APPLE__
1139 return (intx)::pthread_mach_thread_np(::pthread_self());
1140 #else
1141 return (intx)::pthread_self();
1142 #endif
1143 }
1144 int os::current_process_id() {
1145
1146 // Under the old bsd thread library, bsd gives each thread
1147 // its own process id. Because of this each thread will return
1148 // a different pid if this method were to return the result
1149 // of getpid(2). Bsd provides no api that returns the pid
1150 // of the launcher thread for the vm. This implementation
1151 // returns a unique pid, the pid of the launcher thread
1152 // that starts the vm 'process'.
1153
1154 // Under the NPTL, getpid() returns the same pid as the
1155 // launcher thread rather than a unique pid per thread.
1156 // Use gettid() if you want the old pre NPTL behaviour.
1157
1158 // if you are looking for the result of a call to getpid() that
1159 // returns a unique pid for the calling thread, then look at the
1160 // OSThread::thread_id() method in osThread_bsd.hpp file
1161
1162 return (int)(_initial_pid ? _initial_pid : getpid());
1163 }
1164
1165 // DLL functions
1166
1167 #define JNI_LIB_PREFIX "lib"
1168 #ifdef __APPLE__
1169 #define JNI_LIB_SUFFIX ".dylib"
1170 #else
1171 #define JNI_LIB_SUFFIX ".so"
1172 #endif
1173
1174 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1175
1176 // This must be hard coded because it's the system's temporary
1177 // directory not the java application's temp directory, ala java.io.tmpdir.
1178 #ifdef __APPLE__
1179 // macosx has a secure per-user temporary directory
1180 char temp_path_storage[PATH_MAX];
1181 const char* os::get_temp_directory() {
1182 static char *temp_path = NULL;
1183 if (temp_path == NULL) {
1184 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1185 if (pathSize == 0 || pathSize > PATH_MAX) {
1186 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1187 }
1188 temp_path = temp_path_storage;
1189 }
1190 return temp_path;
1191 }
1192 #else /* __APPLE__ */
1193 const char* os::get_temp_directory() { return "/tmp"; }
1194 #endif /* __APPLE__ */
1195
1196 static bool file_exists(const char* filename) {
1197 struct stat statbuf;
1198 if (filename == NULL || strlen(filename) == 0) {
1199 return false;
1200 }
1201 return os::stat(filename, &statbuf) == 0;
1202 }
1203
1204 bool os::dll_build_name(char* buffer, size_t buflen,
1205 const char* pname, const char* fname) {
1206 bool retval = false;
1207 // Copied from libhpi
1208 const size_t pnamelen = pname ? strlen(pname) : 0;
1209
1210 // Return error on buffer overflow.
1211 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1212 return retval;
1213 }
1214
1215 if (pnamelen == 0) {
1216 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1217 retval = true;
1218 } else if (strchr(pname, *os::path_separator()) != NULL) {
1219 int n;
1220 char** pelements = split_path(pname, &n);
1221 if (pelements == NULL) {
1222 return false;
1223 }
1224 for (int i = 0 ; i < n ; i++) {
1225 // Really shouldn't be NULL, but check can't hurt
1226 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1227 continue; // skip the empty path values
1228 }
1229 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1230 pelements[i], fname);
1231 if (file_exists(buffer)) {
1232 retval = true;
1233 break;
1234 }
1235 }
1236 // release the storage
1237 for (int i = 0 ; i < n ; i++) {
1238 if (pelements[i] != NULL) {
1239 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1240 }
1241 }
1242 if (pelements != NULL) {
1243 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1244 }
1245 } else {
1246 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1247 retval = true;
1248 }
1249 return retval;
1250 }
1251
1252 // check if addr is inside libjvm.so
1253 bool os::address_is_in_vm(address addr) {
1254 static address libjvm_base_addr;
1255 Dl_info dlinfo;
1256
1257 if (libjvm_base_addr == NULL) {
1258 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1259 libjvm_base_addr = (address)dlinfo.dli_fbase;
1260 }
1261 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1262 }
1263
1264 if (dladdr((void *)addr, &dlinfo) != 0) {
1265 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1266 }
1267
1268 return false;
1269 }
1270
1271
1272 #define MACH_MAXSYMLEN 256
1273
1274 bool os::dll_address_to_function_name(address addr, char *buf,
1275 int buflen, int *offset) {
1276 // buf is not optional, but offset is optional
1277 assert(buf != NULL, "sanity check");
1278
1279 Dl_info dlinfo;
1280 char localbuf[MACH_MAXSYMLEN];
1281
1282 if (dladdr((void*)addr, &dlinfo) != 0) {
1283 // see if we have a matching symbol
1284 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1285 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1286 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1287 }
1288 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1289 return true;
1290 }
1291 // no matching symbol so try for just file info
1292 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1293 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1294 buf, buflen, offset, dlinfo.dli_fname)) {
1295 return true;
1296 }
1297 }
1298
1299 // Handle non-dynamic manually:
1300 if (dlinfo.dli_fbase != NULL &&
1301 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1302 dlinfo.dli_fbase)) {
1303 if (!Decoder::demangle(localbuf, buf, buflen)) {
1304 jio_snprintf(buf, buflen, "%s", localbuf);
1305 }
1306 return true;
1307 }
1308 }
1309 buf[0] = '\0';
1310 if (offset != NULL) *offset = -1;
1311 return false;
1312 }
1313
1314 // ported from solaris version
1315 bool os::dll_address_to_library_name(address addr, char* buf,
1316 int buflen, int* offset) {
1317 // buf is not optional, but offset is optional
1318 assert(buf != NULL, "sanity check");
1319
1320 Dl_info dlinfo;
1321
1322 if (dladdr((void*)addr, &dlinfo) != 0) {
1323 if (dlinfo.dli_fname != NULL) {
1324 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1325 }
1326 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1327 *offset = addr - (address)dlinfo.dli_fbase;
1328 }
1329 return true;
1330 }
1331
1332 buf[0] = '\0';
1333 if (offset) *offset = -1;
1334 return false;
1335 }
1336
1337 // Loads .dll/.so and
1338 // in case of error it checks if .dll/.so was built for the
1339 // same architecture as Hotspot is running on
1340
1341 #ifdef __APPLE__
1342 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1343 void * result= ::dlopen(filename, RTLD_LAZY);
1344 if (result != NULL) {
1345 // Successful loading
1346 return result;
1347 }
1348
1349 // Read system error message into ebuf
1350 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1351 ebuf[ebuflen-1]='\0';
1352
1353 return NULL;
1354 }
1355 #else
1356 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1357 {
1358 void * result= ::dlopen(filename, RTLD_LAZY);
1359 if (result != NULL) {
1360 // Successful loading
1361 return result;
1362 }
1363
1364 Elf32_Ehdr elf_head;
1365
1366 // Read system error message into ebuf
1367 // It may or may not be overwritten below
1368 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1369 ebuf[ebuflen-1]='\0';
1370 int diag_msg_max_length=ebuflen-strlen(ebuf);
1371 char* diag_msg_buf=ebuf+strlen(ebuf);
1372
1373 if (diag_msg_max_length==0) {
1374 // No more space in ebuf for additional diagnostics message
1375 return NULL;
1376 }
1377
1378
1379 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1380
1381 if (file_descriptor < 0) {
1382 // Can't open library, report dlerror() message
1383 return NULL;
1384 }
1385
1386 bool failed_to_read_elf_head=
1387 (sizeof(elf_head)!=
1388 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1389
1390 ::close(file_descriptor);
1391 if (failed_to_read_elf_head) {
1392 // file i/o error - report dlerror() msg
1393 return NULL;
1394 }
1395
1396 typedef struct {
1397 Elf32_Half code; // Actual value as defined in elf.h
1398 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1399 char elf_class; // 32 or 64 bit
1400 char endianess; // MSB or LSB
1401 char* name; // String representation
1402 } arch_t;
1403
1404 #ifndef EM_486
1405 #define EM_486 6 /* Intel 80486 */
1406 #endif
1407
1408 #ifndef EM_MIPS_RS3_LE
1409 #define EM_MIPS_RS3_LE 10 /* MIPS */
1410 #endif
1411
1412 #ifndef EM_PPC64
1413 #define EM_PPC64 21 /* PowerPC64 */
1414 #endif
1415
1416 #ifndef EM_S390
1417 #define EM_S390 22 /* IBM System/390 */
1418 #endif
1419
1420 #ifndef EM_IA_64
1421 #define EM_IA_64 50 /* HP/Intel IA-64 */
1422 #endif
1423
1424 #ifndef EM_X86_64
1425 #define EM_X86_64 62 /* AMD x86-64 */
1426 #endif
1427
1428 static const arch_t arch_array[]={
1429 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1430 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1431 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1432 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1433 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1434 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1435 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1436 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1437 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1438 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1439 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1440 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1441 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1442 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1443 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1444 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1445 };
1446
1447 #if (defined IA32)
1448 static Elf32_Half running_arch_code=EM_386;
1449 #elif (defined AMD64)
1450 static Elf32_Half running_arch_code=EM_X86_64;
1451 #elif (defined IA64)
1452 static Elf32_Half running_arch_code=EM_IA_64;
1453 #elif (defined __sparc) && (defined _LP64)
1454 static Elf32_Half running_arch_code=EM_SPARCV9;
1455 #elif (defined __sparc) && (!defined _LP64)
1456 static Elf32_Half running_arch_code=EM_SPARC;
1457 #elif (defined __powerpc64__)
1458 static Elf32_Half running_arch_code=EM_PPC64;
1459 #elif (defined __powerpc__)
1460 static Elf32_Half running_arch_code=EM_PPC;
1461 #elif (defined ARM)
1462 static Elf32_Half running_arch_code=EM_ARM;
1463 #elif (defined S390)
1464 static Elf32_Half running_arch_code=EM_S390;
1465 #elif (defined ALPHA)
1466 static Elf32_Half running_arch_code=EM_ALPHA;
1467 #elif (defined MIPSEL)
1468 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1469 #elif (defined PARISC)
1470 static Elf32_Half running_arch_code=EM_PARISC;
1471 #elif (defined MIPS)
1472 static Elf32_Half running_arch_code=EM_MIPS;
1473 #elif (defined M68K)
1474 static Elf32_Half running_arch_code=EM_68K;
1475 #else
1476 #error Method os::dll_load requires that one of following is defined:\
1477 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1478 #endif
1479
1480 // Identify compatability class for VM's architecture and library's architecture
1481 // Obtain string descriptions for architectures
1482
1483 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1484 int running_arch_index=-1;
1485
1486 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
1487 if (running_arch_code == arch_array[i].code) {
1488 running_arch_index = i;
1489 }
1490 if (lib_arch.code == arch_array[i].code) {
1491 lib_arch.compat_class = arch_array[i].compat_class;
1492 lib_arch.name = arch_array[i].name;
1493 }
1494 }
1495
1496 assert(running_arch_index != -1,
1497 "Didn't find running architecture code (running_arch_code) in arch_array");
1498 if (running_arch_index == -1) {
1499 // Even though running architecture detection failed
1500 // we may still continue with reporting dlerror() message
1501 return NULL;
1502 }
1503
1504 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1505 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1506 return NULL;
1507 }
1508
1509 #ifndef S390
1510 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1511 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1512 return NULL;
1513 }
1514 #endif // !S390
1515
1516 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1517 if ( lib_arch.name!=NULL ) {
1518 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1519 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1520 lib_arch.name, arch_array[running_arch_index].name);
1521 } else {
1522 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1523 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1524 lib_arch.code,
1525 arch_array[running_arch_index].name);
1526 }
1527 }
1528
1529 return NULL;
1530 }
1531 #endif /* !__APPLE__ */
1532
1533 // XXX: Do we need a lock around this as per Linux?
1534 void* os::dll_lookup(void* handle, const char* name) {
1535 return dlsym(handle, name);
1536 }
1537
1538
1539 static bool _print_ascii_file(const char* filename, outputStream* st) {
1540 int fd = ::open(filename, O_RDONLY);
1541 if (fd == -1) {
1542 return false;
1543 }
1544
1545 char buf[32];
1546 int bytes;
1547 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1548 st->print_raw(buf, bytes);
1549 }
1550
1551 ::close(fd);
1552
1553 return true;
1554 }
1555
1556 void os::print_dll_info(outputStream *st) {
1557 st->print_cr("Dynamic libraries:");
1558 #ifdef RTLD_DI_LINKMAP
1559 Dl_info dli;
1560 void *handle;
1561 Link_map *map;
1562 Link_map *p;
1563
1564 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1565 dli.dli_fname == NULL) {
1566 st->print_cr("Error: Cannot print dynamic libraries.");
1567 return;
1568 }
1569 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1570 if (handle == NULL) {
1571 st->print_cr("Error: Cannot print dynamic libraries.");
1572 return;
1573 }
1574 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1575 if (map == NULL) {
1576 st->print_cr("Error: Cannot print dynamic libraries.");
1577 return;
1578 }
1579
1580 while (map->l_prev != NULL)
1581 map = map->l_prev;
1582
1583 while (map != NULL) {
1584 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1585 map = map->l_next;
1586 }
1587
1588 dlclose(handle);
1589 #elif defined(__APPLE__)
1590 uint32_t count;
1591 uint32_t i;
1592
1593 count = _dyld_image_count();
1594 for (i = 1; i < count; i++) {
1595 const char *name = _dyld_get_image_name(i);
1596 intptr_t slide = _dyld_get_image_vmaddr_slide(i);
1597 st->print_cr(PTR_FORMAT " \t%s", slide, name);
1598 }
1599 #else
1600 st->print_cr("Error: Cannot print dynamic libraries.");
1601 #endif
1602 }
1603
1604 void os::print_os_info_brief(outputStream* st) {
1605 st->print("Bsd");
1606
1607 os::Posix::print_uname_info(st);
1608 }
1609
1610 void os::print_os_info(outputStream* st) {
1611 st->print("OS:");
1612 st->print("Bsd");
1613
1614 os::Posix::print_uname_info(st);
1615
1616 os::Posix::print_rlimit_info(st);
1617
1618 os::Posix::print_load_average(st);
1619 }
1620
1621 void os::pd_print_cpu_info(outputStream* st) {
1622 // Nothing to do for now.
1623 }
1624
1625 void os::print_memory_info(outputStream* st) {
1626
1627 st->print("Memory:");
1628 st->print(" %dk page", os::vm_page_size()>>10);
1629
1630 st->print(", physical " UINT64_FORMAT "k",
1631 os::physical_memory() >> 10);
1632 st->print("(" UINT64_FORMAT "k free)",
1633 os::available_memory() >> 10);
1634 st->cr();
1635
1636 // meminfo
1637 st->print("\n/proc/meminfo:\n");
1638 _print_ascii_file("/proc/meminfo", st);
1639 st->cr();
1640 }
1641
1642 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific
1643 // but they're the same for all the bsd arch that we support
1644 // and they're the same for solaris but there's no common place to put this.
1645 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
1646 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
1647 "ILL_COPROC", "ILL_BADSTK" };
1648
1649 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
1650 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
1651 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" };
1652
1653 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
1654
1655 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
1656
1657 void os::print_siginfo(outputStream* st, void* siginfo) {
1658 st->print("siginfo:");
1659
1660 const int buflen = 100;
1661 char buf[buflen];
1662 siginfo_t *si = (siginfo_t*)siginfo;
1663 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
1664 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) {
1665 st->print("si_errno=%s", buf);
1666 } else {
1667 st->print("si_errno=%d", si->si_errno);
1668 }
1669 const int c = si->si_code;
1670 assert(c > 0, "unexpected si_code");
1671 switch (si->si_signo) {
1672 case SIGILL:
1673 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
1674 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1675 break;
1676 case SIGFPE:
1677 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
1678 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1679 break;
1680 case SIGSEGV:
1681 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
1682 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1683 break;
1684 case SIGBUS:
1685 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
1686 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
1687 break;
1688 default:
1689 st->print(", si_code=%d", si->si_code);
1690 // no si_addr
1691 }
1692
1693 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
1694 UseSharedSpaces) {
1695 FileMapInfo* mapinfo = FileMapInfo::current_info();
1696 if (mapinfo->is_in_shared_space(si->si_addr)) {
1697 st->print("\n\nError accessing class data sharing archive." \
1698 " Mapped file inaccessible during execution, " \
1699 " possible disk/network problem.");
1700 }
1701 }
1702 st->cr();
1703 }
1704
1705
1706 static void print_signal_handler(outputStream* st, int sig,
1707 char* buf, size_t buflen);
1708
1709 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1710 st->print_cr("Signal Handlers:");
1711 print_signal_handler(st, SIGSEGV, buf, buflen);
1712 print_signal_handler(st, SIGBUS , buf, buflen);
1713 print_signal_handler(st, SIGFPE , buf, buflen);
1714 print_signal_handler(st, SIGPIPE, buf, buflen);
1715 print_signal_handler(st, SIGXFSZ, buf, buflen);
1716 print_signal_handler(st, SIGILL , buf, buflen);
1717 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1718 print_signal_handler(st, SR_signum, buf, buflen);
1719 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1720 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1721 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1722 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1723 }
1724
1725 static char saved_jvm_path[MAXPATHLEN] = {0};
1726
1727 // Find the full path to the current module, libjvm
1728 void os::jvm_path(char *buf, jint buflen) {
1729 // Error checking.
1730 if (buflen < MAXPATHLEN) {
1731 assert(false, "must use a large-enough buffer");
1732 buf[0] = '\0';
1733 return;
1734 }
1735 // Lazy resolve the path to current module.
1736 if (saved_jvm_path[0] != 0) {
1737 strcpy(buf, saved_jvm_path);
1738 return;
1739 }
1740
1741 char dli_fname[MAXPATHLEN];
1742 bool ret = dll_address_to_library_name(
1743 CAST_FROM_FN_PTR(address, os::jvm_path),
1744 dli_fname, sizeof(dli_fname), NULL);
1745 assert(ret, "cannot locate libjvm");
1746 char *rp = NULL;
1747 if (ret && dli_fname[0] != '\0') {
1748 rp = realpath(dli_fname, buf);
1749 }
1750 if (rp == NULL)
1751 return;
1752
1753 if (Arguments::created_by_gamma_launcher()) {
1754 // Support for the gamma launcher. Typical value for buf is
1755 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at
1756 // the right place in the string, then assume we are installed in a JDK and
1757 // we're done. Otherwise, check for a JAVA_HOME environment variable and
1758 // construct a path to the JVM being overridden.
1759
1760 const char *p = buf + strlen(buf) - 1;
1761 for (int count = 0; p > buf && count < 5; ++count) {
1762 for (--p; p > buf && *p != '/'; --p)
1763 /* empty */ ;
1764 }
1765
1766 if (strncmp(p, "/jre/lib/", 9) != 0) {
1767 // Look for JAVA_HOME in the environment.
1768 char* java_home_var = ::getenv("JAVA_HOME");
1769 if (java_home_var != NULL && java_home_var[0] != 0) {
1770 char* jrelib_p;
1771 int len;
1772
1773 // Check the current module name "libjvm"
1774 p = strrchr(buf, '/');
1775 assert(strstr(p, "/libjvm") == p, "invalid library name");
1776
1777 rp = realpath(java_home_var, buf);
1778 if (rp == NULL)
1779 return;
1780
1781 // determine if this is a legacy image or modules image
1782 // modules image doesn't have "jre" subdirectory
1783 len = strlen(buf);
1784 jrelib_p = buf + len;
1785
1786 // Add the appropriate library subdir
1787 snprintf(jrelib_p, buflen-len, "/jre/lib");
1788 if (0 != access(buf, F_OK)) {
1789 snprintf(jrelib_p, buflen-len, "/lib");
1790 }
1791
1792 // Add the appropriate client or server subdir
1793 len = strlen(buf);
1794 jrelib_p = buf + len;
1795 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1796 if (0 != access(buf, F_OK)) {
1797 snprintf(jrelib_p, buflen-len, "");
1798 }
1799
1800 // If the path exists within JAVA_HOME, add the JVM library name
1801 // to complete the path to JVM being overridden. Otherwise fallback
1802 // to the path to the current library.
1803 if (0 == access(buf, F_OK)) {
1804 // Use current module name "libjvm"
1805 len = strlen(buf);
1806 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1807 } else {
1808 // Fall back to path of current library
1809 rp = realpath(dli_fname, buf);
1810 if (rp == NULL)
1811 return;
1812 }
1813 }
1814 }
1815 }
1816
1817 strcpy(saved_jvm_path, buf);
1818 }
1819
1820 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1821 // no prefix required, not even "_"
1822 }
1823
1824 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1825 // no suffix required
1826 }
1827
1828 ////////////////////////////////////////////////////////////////////////////////
1829 // sun.misc.Signal support
1830
1831 static volatile jint sigint_count = 0;
1832
1833 static void
1834 UserHandler(int sig, void *siginfo, void *context) {
1835 // 4511530 - sem_post is serialized and handled by the manager thread. When
1836 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1837 // don't want to flood the manager thread with sem_post requests.
1838 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1839 return;
1840
1841 // Ctrl-C is pressed during error reporting, likely because the error
1842 // handler fails to abort. Let VM die immediately.
1843 if (sig == SIGINT && is_error_reported()) {
1844 os::die();
1845 }
1846
1847 os::signal_notify(sig);
1848 }
1849
1850 void* os::user_handler() {
1851 return CAST_FROM_FN_PTR(void*, UserHandler);
1852 }
1853
1854 extern "C" {
1855 typedef void (*sa_handler_t)(int);
1856 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1857 }
1858
1859 void* os::signal(int signal_number, void* handler) {
1860 struct sigaction sigAct, oldSigAct;
1861
1862 sigfillset(&(sigAct.sa_mask));
1863 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1864 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1865
1866 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1867 // -1 means registration failed
1868 return (void *)-1;
1869 }
1870
1871 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1872 }
1873
1874 void os::signal_raise(int signal_number) {
1875 ::raise(signal_number);
1876 }
1877
1878 /*
1879 * The following code is moved from os.cpp for making this
1880 * code platform specific, which it is by its very nature.
1881 */
1882
1883 // Will be modified when max signal is changed to be dynamic
1884 int os::sigexitnum_pd() {
1885 return NSIG;
1886 }
1887
1888 // a counter for each possible signal value
1889 static volatile jint pending_signals[NSIG+1] = { 0 };
1890
1891 // Bsd(POSIX) specific hand shaking semaphore.
1892 #ifdef __APPLE__
1893 typedef semaphore_t os_semaphore_t;
1894 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1895 #define SEM_WAIT(sem) semaphore_wait(sem)
1896 #define SEM_POST(sem) semaphore_signal(sem)
1897 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1898 #else
1899 typedef sem_t os_semaphore_t;
1900 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1901 #define SEM_WAIT(sem) sem_wait(&sem)
1902 #define SEM_POST(sem) sem_post(&sem)
1903 #define SEM_DESTROY(sem) sem_destroy(&sem)
1904 #endif
1905
1906 class Semaphore : public StackObj {
1907 public:
1908 Semaphore();
1909 ~Semaphore();
1910 void signal();
1911 void wait();
1912 bool trywait();
1913 bool timedwait(unsigned int sec, int nsec);
1914 private:
1915 jlong currenttime() const;
1916 semaphore_t _semaphore;
1917 };
1918
1919 Semaphore::Semaphore() : _semaphore(0) {
1920 SEM_INIT(_semaphore, 0);
1921 }
1922
1923 Semaphore::~Semaphore() {
1924 SEM_DESTROY(_semaphore);
1925 }
1926
1927 void Semaphore::signal() {
1928 SEM_POST(_semaphore);
1929 }
1930
1931 void Semaphore::wait() {
1932 SEM_WAIT(_semaphore);
1933 }
1934
1935 jlong Semaphore::currenttime() const {
1936 struct timeval tv;
1937 gettimeofday(&tv, NULL);
1938 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1939 }
1940
1941 #ifdef __APPLE__
1942 bool Semaphore::trywait() {
1943 return timedwait(0, 0);
1944 }
1945
1946 bool Semaphore::timedwait(unsigned int sec, int nsec) {
1947 kern_return_t kr = KERN_ABORTED;
1948 mach_timespec_t waitspec;
1949 waitspec.tv_sec = sec;
1950 waitspec.tv_nsec = nsec;
1951
1952 jlong starttime = currenttime();
1953
1954 kr = semaphore_timedwait(_semaphore, waitspec);
1955 while (kr == KERN_ABORTED) {
1956 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1957
1958 jlong current = currenttime();
1959 jlong passedtime = current - starttime;
1960
1961 if (passedtime >= totalwait) {
1962 waitspec.tv_sec = 0;
1963 waitspec.tv_nsec = 0;
1964 } else {
1965 jlong waittime = totalwait - (current - starttime);
1966 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
1967 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
1968 }
1969
1970 kr = semaphore_timedwait(_semaphore, waitspec);
1971 }
1972
1973 return kr == KERN_SUCCESS;
1974 }
1975
1976 #else
1977
1978 bool Semaphore::trywait() {
1979 return sem_trywait(&_semaphore) == 0;
1980 }
1981
1982 bool Semaphore::timedwait(unsigned int sec, int nsec) {
1983 struct timespec ts;
1984 jlong endtime = unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
1985
1986 while (1) {
1987 int result = sem_timedwait(&_semaphore, &ts);
1988 if (result == 0) {
1989 return true;
1990 } else if (errno == EINTR) {
1991 continue;
1992 } else if (errno == ETIMEDOUT) {
1993 return false;
1994 } else {
1995 return false;
1996 }
1997 }
1998 }
1999
2000 #endif // __APPLE__
2001
2002 static os_semaphore_t sig_sem;
2003 static Semaphore sr_semaphore;
2004
2005 void os::signal_init_pd() {
2006 // Initialize signal structures
2007 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2008
2009 // Initialize signal semaphore
2010 ::SEM_INIT(sig_sem, 0);
2011 }
2012
2013 void os::signal_notify(int sig) {
2014 Atomic::inc(&pending_signals[sig]);
2015 ::SEM_POST(sig_sem);
2016 }
2017
2018 static int check_pending_signals(bool wait) {
2019 Atomic::store(0, &sigint_count);
2020 for (;;) {
2021 for (int i = 0; i < NSIG + 1; i++) {
2022 jint n = pending_signals[i];
2023 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2024 return i;
2025 }
2026 }
2027 if (!wait) {
2028 return -1;
2029 }
2030 JavaThread *thread = JavaThread::current();
2031 ThreadBlockInVM tbivm(thread);
2032
2033 bool threadIsSuspended;
2034 do {
2035 thread->set_suspend_equivalent();
2036 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2037 ::SEM_WAIT(sig_sem);
2038
2039 // were we externally suspended while we were waiting?
2040 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2041 if (threadIsSuspended) {
2042 //
2043 // The semaphore has been incremented, but while we were waiting
2044 // another thread suspended us. We don't want to continue running
2045 // while suspended because that would surprise the thread that
2046 // suspended us.
2047 //
2048 ::SEM_POST(sig_sem);
2049
2050 thread->java_suspend_self();
2051 }
2052 } while (threadIsSuspended);
2053 }
2054 }
2055
2056 int os::signal_lookup() {
2057 return check_pending_signals(false);
2058 }
2059
2060 int os::signal_wait() {
2061 return check_pending_signals(true);
2062 }
2063
2064 ////////////////////////////////////////////////////////////////////////////////
2065 // Virtual Memory
2066
2067 int os::vm_page_size() {
2068 // Seems redundant as all get out
2069 assert(os::Bsd::page_size() != -1, "must call os::init");
2070 return os::Bsd::page_size();
2071 }
2072
2073 // Solaris allocates memory by pages.
2074 int os::vm_allocation_granularity() {
2075 assert(os::Bsd::page_size() != -1, "must call os::init");
2076 return os::Bsd::page_size();
2077 }
2078
2079 // Rationale behind this function:
2080 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2081 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2082 // samples for JITted code. Here we create private executable mapping over the code cache
2083 // and then we can use standard (well, almost, as mapping can change) way to provide
2084 // info for the reporting script by storing timestamp and location of symbol
2085 void bsd_wrap_code(char* base, size_t size) {
2086 static volatile jint cnt = 0;
2087
2088 if (!UseOprofile) {
2089 return;
2090 }
2091
2092 char buf[PATH_MAX + 1];
2093 int num = Atomic::add(1, &cnt);
2094
2095 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2096 os::get_temp_directory(), os::current_process_id(), num);
2097 unlink(buf);
2098
2099 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2100
2101 if (fd != -1) {
2102 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2103 if (rv != (off_t)-1) {
2104 if (::write(fd, "", 1) == 1) {
2105 mmap(base, size,
2106 PROT_READ|PROT_WRITE|PROT_EXEC,
2107 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2108 }
2109 }
2110 ::close(fd);
2111 unlink(buf);
2112 }
2113 }
2114
2115 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2116 int err) {
2117 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2118 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2119 strerror(err), err);
2120 }
2121
2122 // NOTE: Bsd kernel does not really reserve the pages for us.
2123 // All it does is to check if there are enough free pages
2124 // left at the time of mmap(). This could be a potential
2125 // problem.
2126 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2127 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2128 #ifdef __OpenBSD__
2129 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2130 if (::mprotect(addr, size, prot) == 0) {
2131 return true;
2132 }
2133 #else
2134 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2135 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2136 if (res != (uintptr_t) MAP_FAILED) {
2137 return true;
2138 }
2139 #endif
2140
2141 // Warn about any commit errors we see in non-product builds just
2142 // in case mmap() doesn't work as described on the man page.
2143 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2144
2145 return false;
2146 }
2147
2148 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2149 bool exec) {
2150 // alignment_hint is ignored on this OS
2151 return pd_commit_memory(addr, size, exec);
2152 }
2153
2154 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2155 const char* mesg) {
2156 assert(mesg != NULL, "mesg must be specified");
2157 if (!pd_commit_memory(addr, size, exec)) {
2158 // add extra info in product mode for vm_exit_out_of_memory():
2159 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2160 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
2161 }
2162 }
2163
2164 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2165 size_t alignment_hint, bool exec,
2166 const char* mesg) {
2167 // alignment_hint is ignored on this OS
2168 pd_commit_memory_or_exit(addr, size, exec, mesg);
2169 }
2170
2171 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2172 }
2173
2174 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2175 ::madvise(addr, bytes, MADV_DONTNEED);
2176 }
2177
2178 void os::numa_make_global(char *addr, size_t bytes) {
2179 }
2180
2181 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2182 }
2183
2184 bool os::numa_topology_changed() { return false; }
2185
2186 size_t os::numa_get_groups_num() {
2187 return 1;
2188 }
2189
2190 int os::numa_get_group_id() {
2191 return 0;
2192 }
2193
2194 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2195 if (size > 0) {
2196 ids[0] = 0;
2197 return 1;
2198 }
2199 return 0;
2200 }
2201
2202 bool os::get_page_info(char *start, page_info* info) {
2203 return false;
2204 }
2205
2206 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2207 return end;
2208 }
2209
2210
2211 bool os::pd_uncommit_memory(char* addr, size_t size) {
2212 #ifdef __OpenBSD__
2213 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2214 return ::mprotect(addr, size, PROT_NONE) == 0;
2215 #else
2216 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2217 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2218 return res != (uintptr_t) MAP_FAILED;
2219 #endif
2220 }
2221
2222 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2223 return os::commit_memory(addr, size, !ExecMem);
2224 }
2225
2226 // If this is a growable mapping, remove the guard pages entirely by
2227 // munmap()ping them. If not, just call uncommit_memory().
2228 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2229 return os::uncommit_memory(addr, size);
2230 }
2231
2232 static address _highest_vm_reserved_address = NULL;
2233
2234 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2235 // at 'requested_addr'. If there are existing memory mappings at the same
2236 // location, however, they will be overwritten. If 'fixed' is false,
2237 // 'requested_addr' is only treated as a hint, the return value may or
2238 // may not start from the requested address. Unlike Bsd mmap(), this
2239 // function returns NULL to indicate failure.
2240 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2241 char * addr;
2242 int flags;
2243
2244 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2245 if (fixed) {
2246 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2247 flags |= MAP_FIXED;
2248 }
2249
2250 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2251 // touch an uncommitted page. Otherwise, the read/write might
2252 // succeed if we have enough swap space to back the physical page.
2253 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2254 flags, -1, 0);
2255
2256 if (addr != MAP_FAILED) {
2257 // anon_mmap() should only get called during VM initialization,
2258 // don't need lock (actually we can skip locking even it can be called
2259 // from multiple threads, because _highest_vm_reserved_address is just a
2260 // hint about the upper limit of non-stack memory regions.)
2261 if ((address)addr + bytes > _highest_vm_reserved_address) {
2262 _highest_vm_reserved_address = (address)addr + bytes;
2263 }
2264 }
2265
2266 return addr == MAP_FAILED ? NULL : addr;
2267 }
2268
2269 // Don't update _highest_vm_reserved_address, because there might be memory
2270 // regions above addr + size. If so, releasing a memory region only creates
2271 // a hole in the address space, it doesn't help prevent heap-stack collision.
2272 //
2273 static int anon_munmap(char * addr, size_t size) {
2274 return ::munmap(addr, size) == 0;
2275 }
2276
2277 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2278 size_t alignment_hint) {
2279 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2280 }
2281
2282 bool os::pd_release_memory(char* addr, size_t size) {
2283 return anon_munmap(addr, size);
2284 }
2285
2286 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2287 // Bsd wants the mprotect address argument to be page aligned.
2288 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
2289
2290 // According to SUSv3, mprotect() should only be used with mappings
2291 // established by mmap(), and mmap() always maps whole pages. Unaligned
2292 // 'addr' likely indicates problem in the VM (e.g. trying to change
2293 // protection of malloc'ed or statically allocated memory). Check the
2294 // caller if you hit this assert.
2295 assert(addr == bottom, "sanity check");
2296
2297 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2298 return ::mprotect(bottom, size, prot) == 0;
2299 }
2300
2301 // Set protections specified
2302 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2303 bool is_committed) {
2304 unsigned int p = 0;
2305 switch (prot) {
2306 case MEM_PROT_NONE: p = PROT_NONE; break;
2307 case MEM_PROT_READ: p = PROT_READ; break;
2308 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2309 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2310 default:
2311 ShouldNotReachHere();
2312 }
2313 // is_committed is unused.
2314 return bsd_mprotect(addr, bytes, p);
2315 }
2316
2317 bool os::guard_memory(char* addr, size_t size) {
2318 return bsd_mprotect(addr, size, PROT_NONE);
2319 }
2320
2321 bool os::unguard_memory(char* addr, size_t size) {
2322 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2323 }
2324
2325 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2326 return false;
2327 }
2328
2329 // Large page support
2330
2331 static size_t _large_page_size = 0;
2332
2333 void os::large_page_init() {
2334 }
2335
2336
2337 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2338 fatal("This code is not used or maintained.");
2339
2340 // "exec" is passed in but not used. Creating the shared image for
2341 // the code cache doesn't have an SHM_X executable permission to check.
2342 assert(UseLargePages && UseSHM, "only for SHM large pages");
2343
2344 key_t key = IPC_PRIVATE;
2345 char *addr;
2346
2347 bool warn_on_failure = UseLargePages &&
2348 (!FLAG_IS_DEFAULT(UseLargePages) ||
2349 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
2350 );
2351 char msg[128];
2352
2353 // Create a large shared memory region to attach to based on size.
2354 // Currently, size is the total size of the heap
2355 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2356 if (shmid == -1) {
2357 // Possible reasons for shmget failure:
2358 // 1. shmmax is too small for Java heap.
2359 // > check shmmax value: cat /proc/sys/kernel/shmmax
2360 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2361 // 2. not enough large page memory.
2362 // > check available large pages: cat /proc/meminfo
2363 // > increase amount of large pages:
2364 // echo new_value > /proc/sys/vm/nr_hugepages
2365 // Note 1: different Bsd may use different name for this property,
2366 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2367 // Note 2: it's possible there's enough physical memory available but
2368 // they are so fragmented after a long run that they can't
2369 // coalesce into large pages. Try to reserve large pages when
2370 // the system is still "fresh".
2371 if (warn_on_failure) {
2372 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
2373 warning(msg);
2374 }
2375 return NULL;
2376 }
2377
2378 // attach to the region
2379 addr = (char*)shmat(shmid, req_addr, 0);
2380 int err = errno;
2381
2382 // Remove shmid. If shmat() is successful, the actual shared memory segment
2383 // will be deleted when it's detached by shmdt() or when the process
2384 // terminates. If shmat() is not successful this will remove the shared
2385 // segment immediately.
2386 shmctl(shmid, IPC_RMID, NULL);
2387
2388 if ((intptr_t)addr == -1) {
2389 if (warn_on_failure) {
2390 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
2391 warning(msg);
2392 }
2393 return NULL;
2394 }
2395
2396 // The memory is committed
2397 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC);
2398
2399 return addr;
2400 }
2401
2402 bool os::release_memory_special(char* base, size_t bytes) {
2403 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
2404 // detaching the SHM segment will also delete it, see reserve_memory_special()
2405 int rslt = shmdt(base);
2406 if (rslt == 0) {
2407 tkr.record((address)base, bytes);
2408 return true;
2409 } else {
2410 tkr.discard();
2411 return false;
2412 }
2413
2414 }
2415
2416 size_t os::large_page_size() {
2417 return _large_page_size;
2418 }
2419
2420 // HugeTLBFS allows application to commit large page memory on demand;
2421 // with SysV SHM the entire memory region must be allocated as shared
2422 // memory.
2423 bool os::can_commit_large_page_memory() {
2424 return UseHugeTLBFS;
2425 }
2426
2427 bool os::can_execute_large_page_memory() {
2428 return UseHugeTLBFS;
2429 }
2430
2431 // Reserve memory at an arbitrary address, only if that area is
2432 // available (and not reserved for something else).
2433
2434 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2435 const int max_tries = 10;
2436 char* base[max_tries];
2437 size_t size[max_tries];
2438 const size_t gap = 0x000000;
2439
2440 // Assert only that the size is a multiple of the page size, since
2441 // that's all that mmap requires, and since that's all we really know
2442 // about at this low abstraction level. If we need higher alignment,
2443 // we can either pass an alignment to this method or verify alignment
2444 // in one of the methods further up the call chain. See bug 5044738.
2445 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2446
2447 // Repeatedly allocate blocks until the block is allocated at the
2448 // right spot. Give up after max_tries. Note that reserve_memory() will
2449 // automatically update _highest_vm_reserved_address if the call is
2450 // successful. The variable tracks the highest memory address every reserved
2451 // by JVM. It is used to detect heap-stack collision if running with
2452 // fixed-stack BsdThreads. Because here we may attempt to reserve more
2453 // space than needed, it could confuse the collision detecting code. To
2454 // solve the problem, save current _highest_vm_reserved_address and
2455 // calculate the correct value before return.
2456 address old_highest = _highest_vm_reserved_address;
2457
2458 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2459 // if kernel honors the hint then we can return immediately.
2460 char * addr = anon_mmap(requested_addr, bytes, false);
2461 if (addr == requested_addr) {
2462 return requested_addr;
2463 }
2464
2465 if (addr != NULL) {
2466 // mmap() is successful but it fails to reserve at the requested address
2467 anon_munmap(addr, bytes);
2468 }
2469
2470 int i;
2471 for (i = 0; i < max_tries; ++i) {
2472 base[i] = reserve_memory(bytes);
2473
2474 if (base[i] != NULL) {
2475 // Is this the block we wanted?
2476 if (base[i] == requested_addr) {
2477 size[i] = bytes;
2478 break;
2479 }
2480
2481 // Does this overlap the block we wanted? Give back the overlapped
2482 // parts and try again.
2483
2484 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2485 if (top_overlap >= 0 && top_overlap < bytes) {
2486 unmap_memory(base[i], top_overlap);
2487 base[i] += top_overlap;
2488 size[i] = bytes - top_overlap;
2489 } else {
2490 size_t bottom_overlap = base[i] + bytes - requested_addr;
2491 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2492 unmap_memory(requested_addr, bottom_overlap);
2493 size[i] = bytes - bottom_overlap;
2494 } else {
2495 size[i] = bytes;
2496 }
2497 }
2498 }
2499 }
2500
2501 // Give back the unused reserved pieces.
2502
2503 for (int j = 0; j < i; ++j) {
2504 if (base[j] != NULL) {
2505 unmap_memory(base[j], size[j]);
2506 }
2507 }
2508
2509 if (i < max_tries) {
2510 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes);
2511 return requested_addr;
2512 } else {
2513 _highest_vm_reserved_address = old_highest;
2514 return NULL;
2515 }
2516 }
2517
2518 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2519 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2520 }
2521
2522 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation.
2523 // Solaris uses poll(), bsd uses park().
2524 // Poll() is likely a better choice, assuming that Thread.interrupt()
2525 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with
2526 // SIGSEGV, see 4355769.
2527
2528 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
2529 assert(thread == Thread::current(), "thread consistency check");
2530
2531 ParkEvent * const slp = thread->_SleepEvent ;
2532 slp->reset() ;
2533 OrderAccess::fence() ;
2534
2535 if (interruptible) {
2536 jlong prevtime = javaTimeNanos();
2537
2538 for (;;) {
2539 if (os::is_interrupted(thread, true)) {
2540 return OS_INTRPT;
2541 }
2542
2543 jlong newtime = javaTimeNanos();
2544
2545 if (newtime - prevtime < 0) {
2546 // time moving backwards, should only happen if no monotonic clock
2547 // not a guarantee() because JVM should not abort on kernel/glibc bugs
2548 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
2549 } else {
2550 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2551 }
2552
2553 if(millis <= 0) {
2554 return OS_OK;
2555 }
2556
2557 prevtime = newtime;
2558
2559 {
2560 assert(thread->is_Java_thread(), "sanity check");
2561 JavaThread *jt = (JavaThread *) thread;
2562 ThreadBlockInVM tbivm(jt);
2563 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
2564
2565 jt->set_suspend_equivalent();
2566 // cleared by handle_special_suspend_equivalent_condition() or
2567 // java_suspend_self() via check_and_wait_while_suspended()
2568
2569 slp->park(millis);
2570
2571 // were we externally suspended while we were waiting?
2572 jt->check_and_wait_while_suspended();
2573 }
2574 }
2575 } else {
2576 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
2577 jlong prevtime = javaTimeNanos();
2578
2579 for (;;) {
2580 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
2581 // the 1st iteration ...
2582 jlong newtime = javaTimeNanos();
2583
2584 if (newtime - prevtime < 0) {
2585 // time moving backwards, should only happen if no monotonic clock
2586 // not a guarantee() because JVM should not abort on kernel/glibc bugs
2587 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
2588 } else {
2589 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2590 }
2591
2592 if(millis <= 0) break ;
2593
2594 prevtime = newtime;
2595 slp->park(millis);
2596 }
2597 return OS_OK ;
2598 }
2599 }
2600
2601 int os::naked_sleep() {
2602 // %% make the sleep time an integer flag. for now use 1 millisec.
2603 return os::sleep(Thread::current(), 1, false);
2604 }
2605
2606 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2607 void os::infinite_sleep() {
2608 while (true) { // sleep forever ...
2609 ::sleep(100); // ... 100 seconds at a time
2610 }
2611 }
2612
2613 // Used to convert frequent JVM_Yield() to nops
2614 bool os::dont_yield() {
2615 return DontYieldALot;
2616 }
2617
2618 void os::yield() {
2619 sched_yield();
2620 }
2621
2622 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
2623
2624 void os::yield_all(int attempts) {
2625 // Yields to all threads, including threads with lower priorities
2626 // Threads on Bsd are all with same priority. The Solaris style
2627 // os::yield_all() with nanosleep(1ms) is not necessary.
2628 sched_yield();
2629 }
2630
2631 // Called from the tight loops to possibly influence time-sharing heuristics
2632 void os::loop_breaker(int attempts) {
2633 os::yield_all(attempts);
2634 }
2635
2636 ////////////////////////////////////////////////////////////////////////////////
2637 // thread priority support
2638
2639 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2640 // only supports dynamic priority, static priority must be zero. For real-time
2641 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2642 // However, for large multi-threaded applications, SCHED_RR is not only slower
2643 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2644 // of 5 runs - Sep 2005).
2645 //
2646 // The following code actually changes the niceness of kernel-thread/LWP. It
2647 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2648 // not the entire user process, and user level threads are 1:1 mapped to kernel
2649 // threads. It has always been the case, but could change in the future. For
2650 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2651 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2652
2653 #if !defined(__APPLE__)
2654 int os::java_to_os_priority[CriticalPriority + 1] = {
2655 19, // 0 Entry should never be used
2656
2657 0, // 1 MinPriority
2658 3, // 2
2659 6, // 3
2660
2661 10, // 4
2662 15, // 5 NormPriority
2663 18, // 6
2664
2665 21, // 7
2666 25, // 8
2667 28, // 9 NearMaxPriority
2668
2669 31, // 10 MaxPriority
2670
2671 31 // 11 CriticalPriority
2672 };
2673 #else
2674 /* Using Mach high-level priority assignments */
2675 int os::java_to_os_priority[CriticalPriority + 1] = {
2676 0, // 0 Entry should never be used (MINPRI_USER)
2677
2678 27, // 1 MinPriority
2679 28, // 2
2680 29, // 3
2681
2682 30, // 4
2683 31, // 5 NormPriority (BASEPRI_DEFAULT)
2684 32, // 6
2685
2686 33, // 7
2687 34, // 8
2688 35, // 9 NearMaxPriority
2689
2690 36, // 10 MaxPriority
2691
2692 36 // 11 CriticalPriority
2693 };
2694 #endif
2695
2696 static int prio_init() {
2697 if (ThreadPriorityPolicy == 1) {
2698 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2699 // if effective uid is not root. Perhaps, a more elegant way of doing
2700 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2701 if (geteuid() != 0) {
2702 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2703 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2704 }
2705 ThreadPriorityPolicy = 0;
2706 }
2707 }
2708 if (UseCriticalJavaThreadPriority) {
2709 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2710 }
2711 return 0;
2712 }
2713
2714 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2715 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK;
2716
2717 #ifdef __OpenBSD__
2718 // OpenBSD pthread_setprio starves low priority threads
2719 return OS_OK;
2720 #elif defined(__FreeBSD__)
2721 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2722 #elif defined(__APPLE__) || defined(__NetBSD__)
2723 struct sched_param sp;
2724 int policy;
2725 pthread_t self = pthread_self();
2726
2727 if (pthread_getschedparam(self, &policy, &sp) != 0)
2728 return OS_ERR;
2729
2730 sp.sched_priority = newpri;
2731 if (pthread_setschedparam(self, policy, &sp) != 0)
2732 return OS_ERR;
2733
2734 return OS_OK;
2735 #else
2736 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2737 return (ret == 0) ? OS_OK : OS_ERR;
2738 #endif
2739 }
2740
2741 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2742 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) {
2743 *priority_ptr = java_to_os_priority[NormPriority];
2744 return OS_OK;
2745 }
2746
2747 errno = 0;
2748 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2749 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2750 #elif defined(__APPLE__) || defined(__NetBSD__)
2751 int policy;
2752 struct sched_param sp;
2753
2754 pthread_getschedparam(pthread_self(), &policy, &sp);
2755 *priority_ptr = sp.sched_priority;
2756 #else
2757 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2758 #endif
2759 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2760 }
2761
2762 // Hint to the underlying OS that a task switch would not be good.
2763 // Void return because it's a hint and can fail.
2764 void os::hint_no_preempt() {}
2765
2766 ////////////////////////////////////////////////////////////////////////////////
2767 // suspend/resume support
2768
2769 // the low-level signal-based suspend/resume support is a remnant from the
2770 // old VM-suspension that used to be for java-suspension, safepoints etc,
2771 // within hotspot. Now there is a single use-case for this:
2772 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2773 // that runs in the watcher thread.
2774 // The remaining code is greatly simplified from the more general suspension
2775 // code that used to be used.
2776 //
2777 // The protocol is quite simple:
2778 // - suspend:
2779 // - sends a signal to the target thread
2780 // - polls the suspend state of the osthread using a yield loop
2781 // - target thread signal handler (SR_handler) sets suspend state
2782 // and blocks in sigsuspend until continued
2783 // - resume:
2784 // - sets target osthread state to continue
2785 // - sends signal to end the sigsuspend loop in the SR_handler
2786 //
2787 // Note that the SR_lock plays no role in this suspend/resume protocol.
2788 //
2789
2790 static void resume_clear_context(OSThread *osthread) {
2791 osthread->set_ucontext(NULL);
2792 osthread->set_siginfo(NULL);
2793 }
2794
2795 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2796 osthread->set_ucontext(context);
2797 osthread->set_siginfo(siginfo);
2798 }
2799
2800 //
2801 // Handler function invoked when a thread's execution is suspended or
2802 // resumed. We have to be careful that only async-safe functions are
2803 // called here (Note: most pthread functions are not async safe and
2804 // should be avoided.)
2805 //
2806 // Note: sigwait() is a more natural fit than sigsuspend() from an
2807 // interface point of view, but sigwait() prevents the signal hander
2808 // from being run. libpthread would get very confused by not having
2809 // its signal handlers run and prevents sigwait()'s use with the
2810 // mutex granting granting signal.
2811 //
2812 // Currently only ever called on the VMThread or JavaThread
2813 //
2814 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2815 // Save and restore errno to avoid confusing native code with EINTR
2816 // after sigsuspend.
2817 int old_errno = errno;
2818
2819 Thread* thread = Thread::current();
2820 OSThread* osthread = thread->osthread();
2821 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2822
2823 os::SuspendResume::State current = osthread->sr.state();
2824 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2825 suspend_save_context(osthread, siginfo, context);
2826
2827 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2828 os::SuspendResume::State state = osthread->sr.suspended();
2829 if (state == os::SuspendResume::SR_SUSPENDED) {
2830 sigset_t suspend_set; // signals for sigsuspend()
2831
2832 // get current set of blocked signals and unblock resume signal
2833 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2834 sigdelset(&suspend_set, SR_signum);
2835
2836 sr_semaphore.signal();
2837 // wait here until we are resumed
2838 while (1) {
2839 sigsuspend(&suspend_set);
2840
2841 os::SuspendResume::State result = osthread->sr.running();
2842 if (result == os::SuspendResume::SR_RUNNING) {
2843 sr_semaphore.signal();
2844 break;
2845 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2846 ShouldNotReachHere();
2847 }
2848 }
2849
2850 } else if (state == os::SuspendResume::SR_RUNNING) {
2851 // request was cancelled, continue
2852 } else {
2853 ShouldNotReachHere();
2854 }
2855
2856 resume_clear_context(osthread);
2857 } else if (current == os::SuspendResume::SR_RUNNING) {
2858 // request was cancelled, continue
2859 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2860 // ignore
2861 } else {
2862 // ignore
2863 }
2864
2865 errno = old_errno;
2866 }
2867
2868
2869 static int SR_initialize() {
2870 struct sigaction act;
2871 char *s;
2872 /* Get signal number to use for suspend/resume */
2873 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2874 int sig = ::strtol(s, 0, 10);
2875 if (sig > 0 || sig < NSIG) {
2876 SR_signum = sig;
2877 }
2878 }
2879
2880 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2881 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2882
2883 sigemptyset(&SR_sigset);
2884 sigaddset(&SR_sigset, SR_signum);
2885
2886 /* Set up signal handler for suspend/resume */
2887 act.sa_flags = SA_RESTART|SA_SIGINFO;
2888 act.sa_handler = (void (*)(int)) SR_handler;
2889
2890 // SR_signum is blocked by default.
2891 // 4528190 - We also need to block pthread restart signal (32 on all
2892 // supported Bsd platforms). Note that BsdThreads need to block
2893 // this signal for all threads to work properly. So we don't have
2894 // to use hard-coded signal number when setting up the mask.
2895 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2896
2897 if (sigaction(SR_signum, &act, 0) == -1) {
2898 return -1;
2899 }
2900
2901 // Save signal flag
2902 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2903 return 0;
2904 }
2905
2906 static int sr_notify(OSThread* osthread) {
2907 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2908 assert_status(status == 0, status, "pthread_kill");
2909 return status;
2910 }
2911
2912 // "Randomly" selected value for how long we want to spin
2913 // before bailing out on suspending a thread, also how often
2914 // we send a signal to a thread we want to resume
2915 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2916 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2917
2918 // returns true on success and false on error - really an error is fatal
2919 // but this seems the normal response to library errors
2920 static bool do_suspend(OSThread* osthread) {
2921 assert(osthread->sr.is_running(), "thread should be running");
2922 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2923
2924 // mark as suspended and send signal
2925 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2926 // failed to switch, state wasn't running?
2927 ShouldNotReachHere();
2928 return false;
2929 }
2930
2931 if (sr_notify(osthread) != 0) {
2932 ShouldNotReachHere();
2933 }
2934
2935 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2936 while (true) {
2937 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2938 break;
2939 } else {
2940 // timeout
2941 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2942 if (cancelled == os::SuspendResume::SR_RUNNING) {
2943 return false;
2944 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2945 // make sure that we consume the signal on the semaphore as well
2946 sr_semaphore.wait();
2947 break;
2948 } else {
2949 ShouldNotReachHere();
2950 return false;
2951 }
2952 }
2953 }
2954
2955 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2956 return true;
2957 }
2958
2959 static void do_resume(OSThread* osthread) {
2960 assert(osthread->sr.is_suspended(), "thread should be suspended");
2961 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2962
2963 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2964 // failed to switch to WAKEUP_REQUEST
2965 ShouldNotReachHere();
2966 return;
2967 }
2968
2969 while (true) {
2970 if (sr_notify(osthread) == 0) {
2971 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2972 if (osthread->sr.is_running()) {
2973 return;
2974 }
2975 }
2976 } else {
2977 ShouldNotReachHere();
2978 }
2979 }
2980
2981 guarantee(osthread->sr.is_running(), "Must be running!");
2982 }
2983
2984 ////////////////////////////////////////////////////////////////////////////////
2985 // interrupt support
2986
2987 void os::interrupt(Thread* thread) {
2988 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
2989 "possibility of dangling Thread pointer");
2990
2991 OSThread* osthread = thread->osthread();
2992
2993 if (!osthread->interrupted()) {
2994 osthread->set_interrupted(true);
2995 // More than one thread can get here with the same value of osthread,
2996 // resulting in multiple notifications. We do, however, want the store
2997 // to interrupted() to be visible to other threads before we execute unpark().
2998 OrderAccess::fence();
2999 ParkEvent * const slp = thread->_SleepEvent ;
3000 if (slp != NULL) slp->unpark() ;
3001 }
3002
3003 // For JSR166. Unpark even if interrupt status already was set
3004 if (thread->is_Java_thread())
3005 ((JavaThread*)thread)->parker()->unpark();
3006
3007 ParkEvent * ev = thread->_ParkEvent ;
3008 if (ev != NULL) ev->unpark() ;
3009
3010 }
3011
3012 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3013 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
3014 "possibility of dangling Thread pointer");
3015
3016 OSThread* osthread = thread->osthread();
3017
3018 bool interrupted = osthread->interrupted();
3019
3020 if (interrupted && clear_interrupted) {
3021 osthread->set_interrupted(false);
3022 // consider thread->_SleepEvent->reset() ... optional optimization
3023 }
3024
3025 return interrupted;
3026 }
3027
3028 ///////////////////////////////////////////////////////////////////////////////////
3029 // signal handling (except suspend/resume)
3030
3031 // This routine may be used by user applications as a "hook" to catch signals.
3032 // The user-defined signal handler must pass unrecognized signals to this
3033 // routine, and if it returns true (non-zero), then the signal handler must
3034 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3035 // routine will never retun false (zero), but instead will execute a VM panic
3036 // routine kill the process.
3037 //
3038 // If this routine returns false, it is OK to call it again. This allows
3039 // the user-defined signal handler to perform checks either before or after
3040 // the VM performs its own checks. Naturally, the user code would be making
3041 // a serious error if it tried to handle an exception (such as a null check
3042 // or breakpoint) that the VM was generating for its own correct operation.
3043 //
3044 // This routine may recognize any of the following kinds of signals:
3045 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3046 // It should be consulted by handlers for any of those signals.
3047 //
3048 // The caller of this routine must pass in the three arguments supplied
3049 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3050 // field of the structure passed to sigaction(). This routine assumes that
3051 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3052 //
3053 // Note that the VM will print warnings if it detects conflicting signal
3054 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3055 //
3056 extern "C" JNIEXPORT int
3057 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
3058 void* ucontext, int abort_if_unrecognized);
3059
3060 void signalHandler(int sig, siginfo_t* info, void* uc) {
3061 assert(info != NULL && uc != NULL, "it must be old kernel");
3062 int orig_errno = errno; // Preserve errno value over signal handler.
3063 JVM_handle_bsd_signal(sig, info, uc, true);
3064 errno = orig_errno;
3065 }
3066
3067
3068 // This boolean allows users to forward their own non-matching signals
3069 // to JVM_handle_bsd_signal, harmlessly.
3070 bool os::Bsd::signal_handlers_are_installed = false;
3071
3072 // For signal-chaining
3073 struct sigaction os::Bsd::sigact[MAXSIGNUM];
3074 unsigned int os::Bsd::sigs = 0;
3075 bool os::Bsd::libjsig_is_loaded = false;
3076 typedef struct sigaction *(*get_signal_t)(int);
3077 get_signal_t os::Bsd::get_signal_action = NULL;
3078
3079 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
3080 struct sigaction *actp = NULL;
3081
3082 if (libjsig_is_loaded) {
3083 // Retrieve the old signal handler from libjsig
3084 actp = (*get_signal_action)(sig);
3085 }
3086 if (actp == NULL) {
3087 // Retrieve the preinstalled signal handler from jvm
3088 actp = get_preinstalled_handler(sig);
3089 }
3090
3091 return actp;
3092 }
3093
3094 static bool call_chained_handler(struct sigaction *actp, int sig,
3095 siginfo_t *siginfo, void *context) {
3096 // Call the old signal handler
3097 if (actp->sa_handler == SIG_DFL) {
3098 // It's more reasonable to let jvm treat it as an unexpected exception
3099 // instead of taking the default action.
3100 return false;
3101 } else if (actp->sa_handler != SIG_IGN) {
3102 if ((actp->sa_flags & SA_NODEFER) == 0) {
3103 // automaticlly block the signal
3104 sigaddset(&(actp->sa_mask), sig);
3105 }
3106
3107 sa_handler_t hand;
3108 sa_sigaction_t sa;
3109 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3110 // retrieve the chained handler
3111 if (siginfo_flag_set) {
3112 sa = actp->sa_sigaction;
3113 } else {
3114 hand = actp->sa_handler;
3115 }
3116
3117 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3118 actp->sa_handler = SIG_DFL;
3119 }
3120
3121 // try to honor the signal mask
3122 sigset_t oset;
3123 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3124
3125 // call into the chained handler
3126 if (siginfo_flag_set) {
3127 (*sa)(sig, siginfo, context);
3128 } else {
3129 (*hand)(sig);
3130 }
3131
3132 // restore the signal mask
3133 pthread_sigmask(SIG_SETMASK, &oset, 0);
3134 }
3135 // Tell jvm's signal handler the signal is taken care of.
3136 return true;
3137 }
3138
3139 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3140 bool chained = false;
3141 // signal-chaining
3142 if (UseSignalChaining) {
3143 struct sigaction *actp = get_chained_signal_action(sig);
3144 if (actp != NULL) {
3145 chained = call_chained_handler(actp, sig, siginfo, context);
3146 }
3147 }
3148 return chained;
3149 }
3150
3151 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
3152 if ((( (unsigned int)1 << sig ) & sigs) != 0) {
3153 return &sigact[sig];
3154 }
3155 return NULL;
3156 }
3157
3158 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3159 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3160 sigact[sig] = oldAct;
3161 sigs |= (unsigned int)1 << sig;
3162 }
3163
3164 // for diagnostic
3165 int os::Bsd::sigflags[MAXSIGNUM];
3166
3167 int os::Bsd::get_our_sigflags(int sig) {
3168 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3169 return sigflags[sig];
3170 }
3171
3172 void os::Bsd::set_our_sigflags(int sig, int flags) {
3173 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3174 sigflags[sig] = flags;
3175 }
3176
3177 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3178 // Check for overwrite.
3179 struct sigaction oldAct;
3180 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3181
3182 void* oldhand = oldAct.sa_sigaction
3183 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3184 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3185 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3186 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3187 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3188 if (AllowUserSignalHandlers || !set_installed) {
3189 // Do not overwrite; user takes responsibility to forward to us.
3190 return;
3191 } else if (UseSignalChaining) {
3192 // save the old handler in jvm
3193 save_preinstalled_handler(sig, oldAct);
3194 // libjsig also interposes the sigaction() call below and saves the
3195 // old sigaction on it own.
3196 } else {
3197 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3198 "%#lx for signal %d.", (long)oldhand, sig));
3199 }
3200 }
3201
3202 struct sigaction sigAct;
3203 sigfillset(&(sigAct.sa_mask));
3204 sigAct.sa_handler = SIG_DFL;
3205 if (!set_installed) {
3206 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3207 } else {
3208 sigAct.sa_sigaction = signalHandler;
3209 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3210 }
3211 #if __APPLE__
3212 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3213 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3214 // if the signal handler declares it will handle it on alternate stack.
3215 // Notice we only declare we will handle it on alt stack, but we are not
3216 // actually going to use real alt stack - this is just a workaround.
3217 // Please see ux_exception.c, method catch_mach_exception_raise for details
3218 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3219 if (sig == SIGSEGV) {
3220 sigAct.sa_flags |= SA_ONSTACK;
3221 }
3222 #endif
3223
3224 // Save flags, which are set by ours
3225 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3226 sigflags[sig] = sigAct.sa_flags;
3227
3228 int ret = sigaction(sig, &sigAct, &oldAct);
3229 assert(ret == 0, "check");
3230
3231 void* oldhand2 = oldAct.sa_sigaction
3232 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3233 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3234 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3235 }
3236
3237 // install signal handlers for signals that HotSpot needs to
3238 // handle in order to support Java-level exception handling.
3239
3240 void os::Bsd::install_signal_handlers() {
3241 if (!signal_handlers_are_installed) {
3242 signal_handlers_are_installed = true;
3243
3244 // signal-chaining
3245 typedef void (*signal_setting_t)();
3246 signal_setting_t begin_signal_setting = NULL;
3247 signal_setting_t end_signal_setting = NULL;
3248 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3249 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3250 if (begin_signal_setting != NULL) {
3251 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3252 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3253 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3254 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3255 libjsig_is_loaded = true;
3256 assert(UseSignalChaining, "should enable signal-chaining");
3257 }
3258 if (libjsig_is_loaded) {
3259 // Tell libjsig jvm is setting signal handlers
3260 (*begin_signal_setting)();
3261 }
3262
3263 set_signal_handler(SIGSEGV, true);
3264 set_signal_handler(SIGPIPE, true);
3265 set_signal_handler(SIGBUS, true);
3266 set_signal_handler(SIGILL, true);
3267 set_signal_handler(SIGFPE, true);
3268 set_signal_handler(SIGXFSZ, true);
3269
3270 #if defined(__APPLE__)
3271 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3272 // signals caught and handled by the JVM. To work around this, we reset the mach task
3273 // signal handler that's placed on our process by CrashReporter. This disables
3274 // CrashReporter-based reporting.
3275 //
3276 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3277 // on caught fatal signals.
3278 //
3279 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3280 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3281 // exception handling, while leaving the standard BSD signal handlers functional.
3282 kern_return_t kr;
3283 kr = task_set_exception_ports(mach_task_self(),
3284 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3285 MACH_PORT_NULL,
3286 EXCEPTION_STATE_IDENTITY,
3287 MACHINE_THREAD_STATE);
3288
3289 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3290 #endif
3291
3292 if (libjsig_is_loaded) {
3293 // Tell libjsig jvm finishes setting signal handlers
3294 (*end_signal_setting)();
3295 }
3296
3297 // We don't activate signal checker if libjsig is in place, we trust ourselves
3298 // and if UserSignalHandler is installed all bets are off
3299 if (CheckJNICalls) {
3300 if (libjsig_is_loaded) {
3301 if (PrintJNIResolving) {
3302 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3303 }
3304 check_signals = false;
3305 }
3306 if (AllowUserSignalHandlers) {
3307 if (PrintJNIResolving) {
3308 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3309 }
3310 check_signals = false;
3311 }
3312 }
3313 }
3314 }
3315
3316
3317 /////
3318 // glibc on Bsd platform uses non-documented flag
3319 // to indicate, that some special sort of signal
3320 // trampoline is used.
3321 // We will never set this flag, and we should
3322 // ignore this flag in our diagnostic
3323 #ifdef SIGNIFICANT_SIGNAL_MASK
3324 #undef SIGNIFICANT_SIGNAL_MASK
3325 #endif
3326 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3327
3328 static const char* get_signal_handler_name(address handler,
3329 char* buf, int buflen) {
3330 int offset;
3331 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3332 if (found) {
3333 // skip directory names
3334 const char *p1, *p2;
3335 p1 = buf;
3336 size_t len = strlen(os::file_separator());
3337 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3338 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3339 } else {
3340 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3341 }
3342 return buf;
3343 }
3344
3345 static void print_signal_handler(outputStream* st, int sig,
3346 char* buf, size_t buflen) {
3347 struct sigaction sa;
3348
3349 sigaction(sig, NULL, &sa);
3350
3351 // See comment for SIGNIFICANT_SIGNAL_MASK define
3352 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3353
3354 st->print("%s: ", os::exception_name(sig, buf, buflen));
3355
3356 address handler = (sa.sa_flags & SA_SIGINFO)
3357 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3358 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3359
3360 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3361 st->print("SIG_DFL");
3362 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3363 st->print("SIG_IGN");
3364 } else {
3365 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3366 }
3367
3368 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
3369
3370 address rh = VMError::get_resetted_sighandler(sig);
3371 // May be, handler was resetted by VMError?
3372 if(rh != NULL) {
3373 handler = rh;
3374 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3375 }
3376
3377 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
3378
3379 // Check: is it our handler?
3380 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3381 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3382 // It is our signal handler
3383 // check for flags, reset system-used one!
3384 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3385 st->print(
3386 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3387 os::Bsd::get_our_sigflags(sig));
3388 }
3389 }
3390 st->cr();
3391 }
3392
3393
3394 #define DO_SIGNAL_CHECK(sig) \
3395 if (!sigismember(&check_signal_done, sig)) \
3396 os::Bsd::check_signal_handler(sig)
3397
3398 // This method is a periodic task to check for misbehaving JNI applications
3399 // under CheckJNI, we can add any periodic checks here
3400
3401 void os::run_periodic_checks() {
3402
3403 if (check_signals == false) return;
3404
3405 // SEGV and BUS if overridden could potentially prevent
3406 // generation of hs*.log in the event of a crash, debugging
3407 // such a case can be very challenging, so we absolutely
3408 // check the following for a good measure:
3409 DO_SIGNAL_CHECK(SIGSEGV);
3410 DO_SIGNAL_CHECK(SIGILL);
3411 DO_SIGNAL_CHECK(SIGFPE);
3412 DO_SIGNAL_CHECK(SIGBUS);
3413 DO_SIGNAL_CHECK(SIGPIPE);
3414 DO_SIGNAL_CHECK(SIGXFSZ);
3415
3416
3417 // ReduceSignalUsage allows the user to override these handlers
3418 // see comments at the very top and jvm_solaris.h
3419 if (!ReduceSignalUsage) {
3420 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3421 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3422 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3423 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3424 }
3425
3426 DO_SIGNAL_CHECK(SR_signum);
3427 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3428 }
3429
3430 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3431
3432 static os_sigaction_t os_sigaction = NULL;
3433
3434 void os::Bsd::check_signal_handler(int sig) {
3435 char buf[O_BUFLEN];
3436 address jvmHandler = NULL;
3437
3438
3439 struct sigaction act;
3440 if (os_sigaction == NULL) {
3441 // only trust the default sigaction, in case it has been interposed
3442 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3443 if (os_sigaction == NULL) return;
3444 }
3445
3446 os_sigaction(sig, (struct sigaction*)NULL, &act);
3447
3448
3449 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3450
3451 address thisHandler = (act.sa_flags & SA_SIGINFO)
3452 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3453 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
3454
3455
3456 switch(sig) {
3457 case SIGSEGV:
3458 case SIGBUS:
3459 case SIGFPE:
3460 case SIGPIPE:
3461 case SIGILL:
3462 case SIGXFSZ:
3463 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3464 break;
3465
3466 case SHUTDOWN1_SIGNAL:
3467 case SHUTDOWN2_SIGNAL:
3468 case SHUTDOWN3_SIGNAL:
3469 case BREAK_SIGNAL:
3470 jvmHandler = (address)user_handler();
3471 break;
3472
3473 case INTERRUPT_SIGNAL:
3474 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3475 break;
3476
3477 default:
3478 if (sig == SR_signum) {
3479 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3480 } else {
3481 return;
3482 }
3483 break;
3484 }
3485
3486 if (thisHandler != jvmHandler) {
3487 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3488 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3489 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3490 // No need to check this sig any longer
3491 sigaddset(&check_signal_done, sig);
3492 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3493 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3494 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig));
3495 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3496 // No need to check this sig any longer
3497 sigaddset(&check_signal_done, sig);
3498 }
3499
3500 // Dump all the signal
3501 if (sigismember(&check_signal_done, sig)) {
3502 print_signal_handlers(tty, buf, O_BUFLEN);
3503 }
3504 }
3505
3506 extern void report_error(char* file_name, int line_no, char* title, char* format, ...);
3507
3508 extern bool signal_name(int signo, char* buf, size_t len);
3509
3510 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3511 if (0 < exception_code && exception_code <= SIGRTMAX) {
3512 // signal
3513 if (!signal_name(exception_code, buf, size)) {
3514 jio_snprintf(buf, size, "SIG%d", exception_code);
3515 }
3516 return buf;
3517 } else {
3518 return NULL;
3519 }
3520 }
3521
3522 // this is called _before_ the most of global arguments have been parsed
3523 void os::init(void) {
3524 char dummy; /* used to get a guess on initial stack address */
3525 // first_hrtime = gethrtime();
3526
3527 // With BsdThreads the JavaMain thread pid (primordial thread)
3528 // is different than the pid of the java launcher thread.
3529 // So, on Bsd, the launcher thread pid is passed to the VM
3530 // via the sun.java.launcher.pid property.
3531 // Use this property instead of getpid() if it was correctly passed.
3532 // See bug 6351349.
3533 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3534
3535 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3536
3537 clock_tics_per_sec = CLK_TCK;
3538
3539 init_random(1234567);
3540
3541 ThreadCritical::initialize();
3542
3543 Bsd::set_page_size(getpagesize());
3544 if (Bsd::page_size() == -1) {
3545 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)",
3546 strerror(errno)));
3547 }
3548 init_page_sizes((size_t) Bsd::page_size());
3549
3550 Bsd::initialize_system_info();
3551
3552 // main_thread points to the aboriginal thread
3553 Bsd::_main_thread = pthread_self();
3554
3555 Bsd::clock_init();
3556 initial_time_count = os::elapsed_counter();
3557
3558 #ifdef __APPLE__
3559 // XXXDARWIN
3560 // Work around the unaligned VM callbacks in hotspot's
3561 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3562 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3563 // alignment when doing symbol lookup. To work around this, we force early
3564 // binding of all symbols now, thus binding when alignment is known-good.
3565 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3566 #endif
3567 }
3568
3569 // To install functions for atexit system call
3570 extern "C" {
3571 static void perfMemory_exit_helper() {
3572 perfMemory_exit();
3573 }
3574 }
3575
3576 // this is called _after_ the global arguments have been parsed
3577 jint os::init_2(void)
3578 {
3579 // Allocate a single page and mark it as readable for safepoint polling
3580 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3581 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" );
3582
3583 os::set_polling_page( polling_page );
3584
3585 #ifndef PRODUCT
3586 if(Verbose && PrintMiscellaneous)
3587 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3588 #endif
3589
3590 if (!UseMembar) {
3591 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3592 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page");
3593 os::set_memory_serialize_page( mem_serialize_page );
3594
3595 #ifndef PRODUCT
3596 if(Verbose && PrintMiscellaneous)
3597 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3598 #endif
3599 }
3600
3601 // initialize suspend/resume support - must do this before signal_sets_init()
3602 if (SR_initialize() != 0) {
3603 perror("SR_initialize failed");
3604 return JNI_ERR;
3605 }
3606
3607 Bsd::signal_sets_init();
3608 Bsd::install_signal_handlers();
3609
3610 // Check minimum allowable stack size for thread creation and to initialize
3611 // the java system classes, including StackOverflowError - depends on page
3612 // size. Add a page for compiler2 recursion in main thread.
3613 // Add in 2*BytesPerWord times page size to account for VM stack during
3614 // class initialization depending on 32 or 64 bit VM.
3615 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
3616 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3617 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
3618
3619 size_t threadStackSizeInBytes = ThreadStackSize * K;
3620 if (threadStackSizeInBytes != 0 &&
3621 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
3622 tty->print_cr("\nThe stack size specified is too small, "
3623 "Specify at least %dk",
3624 os::Bsd::min_stack_allowed/ K);
3625 return JNI_ERR;
3626 }
3627
3628 // Make the stack size a multiple of the page size so that
3629 // the yellow/red zones can be guarded.
3630 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
3631 vm_page_size()));
3632
3633 if (MaxFDLimit) {
3634 // set the number of file descriptors to max. print out error
3635 // if getrlimit/setrlimit fails but continue regardless.
3636 struct rlimit nbr_files;
3637 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3638 if (status != 0) {
3639 if (PrintMiscellaneous && (Verbose || WizardMode))
3640 perror("os::init_2 getrlimit failed");
3641 } else {
3642 nbr_files.rlim_cur = nbr_files.rlim_max;
3643
3644 #ifdef __APPLE__
3645 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3646 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3647 // be used instead
3648 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3649 #endif
3650
3651 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3652 if (status != 0) {
3653 if (PrintMiscellaneous && (Verbose || WizardMode))
3654 perror("os::init_2 setrlimit failed");
3655 }
3656 }
3657 }
3658
3659 // at-exit methods are called in the reverse order of their registration.
3660 // atexit functions are called on return from main or as a result of a
3661 // call to exit(3C). There can be only 32 of these functions registered
3662 // and atexit() does not set errno.
3663
3664 if (PerfAllowAtExitRegistration) {
3665 // only register atexit functions if PerfAllowAtExitRegistration is set.
3666 // atexit functions can be delayed until process exit time, which
3667 // can be problematic for embedded VM situations. Embedded VMs should
3668 // call DestroyJavaVM() to assure that VM resources are released.
3669
3670 // note: perfMemory_exit_helper atexit function may be removed in
3671 // the future if the appropriate cleanup code can be added to the
3672 // VM_Exit VMOperation's doit method.
3673 if (atexit(perfMemory_exit_helper) != 0) {
3674 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3675 }
3676 }
3677
3678 // initialize thread priority policy
3679 prio_init();
3680
3681 #ifdef __APPLE__
3682 // dynamically link to objective c gc registration
3683 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3684 if (handleLibObjc != NULL) {
3685 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3686 }
3687 #endif
3688
3689 return JNI_OK;
3690 }
3691
3692 // this is called at the end of vm_initialization
3693 void os::init_3(void) { }
3694
3695 // Mark the polling page as unreadable
3696 void os::make_polling_page_unreadable(void) {
3697 if( !guard_memory((char*)_polling_page, Bsd::page_size()) )
3698 fatal("Could not disable polling page");
3699 };
3700
3701 // Mark the polling page as readable
3702 void os::make_polling_page_readable(void) {
3703 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3704 fatal("Could not enable polling page");
3705 }
3706 };
3707
3708 int os::active_processor_count() {
3709 return _processor_count;
3710 }
3711
3712 void os::set_native_thread_name(const char *name) {
3713 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3714 // This is only supported in Snow Leopard and beyond
3715 if (name != NULL) {
3716 // Add a "Java: " prefix to the name
3717 char buf[MAXTHREADNAMESIZE];
3718 snprintf(buf, sizeof(buf), "Java: %s", name);
3719 pthread_setname_np(buf);
3720 }
3721 #endif
3722 }
3723
3724 bool os::distribute_processes(uint length, uint* distribution) {
3725 // Not yet implemented.
3726 return false;
3727 }
3728
3729 bool os::bind_to_processor(uint processor_id) {
3730 // Not yet implemented.
3731 return false;
3732 }
3733
3734 void os::SuspendedThreadTask::internal_do_task() {
3735 if (do_suspend(_thread->osthread())) {
3736 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3737 do_task(context);
3738 do_resume(_thread->osthread());
3739 }
3740 }
3741
3742 ///
3743 class PcFetcher : public os::SuspendedThreadTask {
3744 public:
3745 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3746 ExtendedPC result();
3747 protected:
3748 void do_task(const os::SuspendedThreadTaskContext& context);
3749 private:
3750 ExtendedPC _epc;
3751 };
3752
3753 ExtendedPC PcFetcher::result() {
3754 guarantee(is_done(), "task is not done yet.");
3755 return _epc;
3756 }
3757
3758 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3759 Thread* thread = context.thread();
3760 OSThread* osthread = thread->osthread();
3761 if (osthread->ucontext() != NULL) {
3762 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext());
3763 } else {
3764 // NULL context is unexpected, double-check this is the VMThread
3765 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3766 }
3767 }
3768
3769 // Suspends the target using the signal mechanism and then grabs the PC before
3770 // resuming the target. Used by the flat-profiler only
3771 ExtendedPC os::get_thread_pc(Thread* thread) {
3772 // Make sure that it is called by the watcher for the VMThread
3773 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3774 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3775
3776 PcFetcher fetcher(thread);
3777 fetcher.run();
3778 return fetcher.result();
3779 }
3780
3781 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime)
3782 {
3783 return pthread_cond_timedwait(_cond, _mutex, _abstime);
3784 }
3785
3786 ////////////////////////////////////////////////////////////////////////////////
3787 // debug support
3788
3789 bool os::find(address addr, outputStream* st) {
3790 Dl_info dlinfo;
3791 memset(&dlinfo, 0, sizeof(dlinfo));
3792 if (dladdr(addr, &dlinfo) != 0) {
3793 st->print(PTR_FORMAT ": ", addr);
3794 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3795 st->print("%s+%#x", dlinfo.dli_sname,
3796 addr - (intptr_t)dlinfo.dli_saddr);
3797 } else if (dlinfo.dli_fbase != NULL) {
3798 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3799 } else {
3800 st->print("<absolute address>");
3801 }
3802 if (dlinfo.dli_fname != NULL) {
3803 st->print(" in %s", dlinfo.dli_fname);
3804 }
3805 if (dlinfo.dli_fbase != NULL) {
3806 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3807 }
3808 st->cr();
3809
3810 if (Verbose) {
3811 // decode some bytes around the PC
3812 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3813 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3814 address lowest = (address) dlinfo.dli_sname;
3815 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3816 if (begin < lowest) begin = lowest;
3817 Dl_info dlinfo2;
3818 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3819 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
3820 end = (address) dlinfo2.dli_saddr;
3821 Disassembler::decode(begin, end, st);
3822 }
3823 return true;
3824 }
3825 return false;
3826 }
3827
3828 ////////////////////////////////////////////////////////////////////////////////
3829 // misc
3830
3831 // This does not do anything on Bsd. This is basically a hook for being
3832 // able to use structured exception handling (thread-local exception filters)
3833 // on, e.g., Win32.
3834 void
3835 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3836 JavaCallArguments* args, Thread* thread) {
3837 f(value, method, args, thread);
3838 }
3839
3840 void os::print_statistics() {
3841 }
3842
3843 int os::message_box(const char* title, const char* message) {
3844 int i;
3845 fdStream err(defaultStream::error_fd());
3846 for (i = 0; i < 78; i++) err.print_raw("=");
3847 err.cr();
3848 err.print_raw_cr(title);
3849 for (i = 0; i < 78; i++) err.print_raw("-");
3850 err.cr();
3851 err.print_raw_cr(message);
3852 for (i = 0; i < 78; i++) err.print_raw("=");
3853 err.cr();
3854
3855 char buf[16];
3856 // Prevent process from exiting upon "read error" without consuming all CPU
3857 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3858
3859 return buf[0] == 'y' || buf[0] == 'Y';
3860 }
3861
3862 int os::stat(const char *path, struct stat *sbuf) {
3863 char pathbuf[MAX_PATH];
3864 if (strlen(path) > MAX_PATH - 1) {
3865 errno = ENAMETOOLONG;
3866 return -1;
3867 }
3868 os::native_path(strcpy(pathbuf, path));
3869 return ::stat(pathbuf, sbuf);
3870 }
3871
3872 bool os::check_heap(bool force) {
3873 return true;
3874 }
3875
3876 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
3877 return ::vsnprintf(buf, count, format, args);
3878 }
3879
3880 // Is a (classpath) directory empty?
3881 bool os::dir_is_empty(const char* path) {
3882 DIR *dir = NULL;
3883 struct dirent *ptr;
3884
3885 dir = opendir(path);
3886 if (dir == NULL) return true;
3887
3888 /* Scan the directory */
3889 bool result = true;
3890 char buf[sizeof(struct dirent) + MAX_PATH];
3891 while (result && (ptr = ::readdir(dir)) != NULL) {
3892 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3893 result = false;
3894 }
3895 }
3896 closedir(dir);
3897 return result;
3898 }
3899
3900 // This code originates from JDK's sysOpen and open64_w
3901 // from src/solaris/hpi/src/system_md.c
3902
3903 #ifndef O_DELETE
3904 #define O_DELETE 0x10000
3905 #endif
3906
3907 // Open a file. Unlink the file immediately after open returns
3908 // if the specified oflag has the O_DELETE flag set.
3909 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
3910
3911 int os::open(const char *path, int oflag, int mode) {
3912
3913 if (strlen(path) > MAX_PATH - 1) {
3914 errno = ENAMETOOLONG;
3915 return -1;
3916 }
3917 int fd;
3918 int o_delete = (oflag & O_DELETE);
3919 oflag = oflag & ~O_DELETE;
3920
3921 fd = ::open(path, oflag, mode);
3922 if (fd == -1) return -1;
3923
3924 //If the open succeeded, the file might still be a directory
3925 {
3926 struct stat buf;
3927 int ret = ::fstat(fd, &buf);
3928 int st_mode = buf.st_mode;
3929
3930 if (ret != -1) {
3931 if ((st_mode & S_IFMT) == S_IFDIR) {
3932 errno = EISDIR;
3933 ::close(fd);
3934 return -1;
3935 }
3936 } else {
3937 ::close(fd);
3938 return -1;
3939 }
3940 }
3941
3942 /*
3943 * All file descriptors that are opened in the JVM and not
3944 * specifically destined for a subprocess should have the
3945 * close-on-exec flag set. If we don't set it, then careless 3rd
3946 * party native code might fork and exec without closing all
3947 * appropriate file descriptors (e.g. as we do in closeDescriptors in
3948 * UNIXProcess.c), and this in turn might:
3949 *
3950 * - cause end-of-file to fail to be detected on some file
3951 * descriptors, resulting in mysterious hangs, or
3952 *
3953 * - might cause an fopen in the subprocess to fail on a system
3954 * suffering from bug 1085341.
3955 *
3956 * (Yes, the default setting of the close-on-exec flag is a Unix
3957 * design flaw)
3958 *
3959 * See:
3960 * 1085341: 32-bit stdio routines should support file descriptors >255
3961 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3962 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3963 */
3964 #ifdef FD_CLOEXEC
3965 {
3966 int flags = ::fcntl(fd, F_GETFD);
3967 if (flags != -1)
3968 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3969 }
3970 #endif
3971
3972 if (o_delete != 0) {
3973 ::unlink(path);
3974 }
3975 return fd;
3976 }
3977
3978
3979 // create binary file, rewriting existing file if required
3980 int os::create_binary_file(const char* path, bool rewrite_existing) {
3981 int oflags = O_WRONLY | O_CREAT;
3982 if (!rewrite_existing) {
3983 oflags |= O_EXCL;
3984 }
3985 return ::open(path, oflags, S_IREAD | S_IWRITE);
3986 }
3987
3988 // return current position of file pointer
3989 jlong os::current_file_offset(int fd) {
3990 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3991 }
3992
3993 // move file pointer to the specified offset
3994 jlong os::seek_to_file_offset(int fd, jlong offset) {
3995 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3996 }
3997
3998 // This code originates from JDK's sysAvailable
3999 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4000
4001 int os::available(int fd, jlong *bytes) {
4002 jlong cur, end;
4003 int mode;
4004 struct stat buf;
4005
4006 if (::fstat(fd, &buf) >= 0) {
4007 mode = buf.st_mode;
4008 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4009 /*
4010 * XXX: is the following call interruptible? If so, this might
4011 * need to go through the INTERRUPT_IO() wrapper as for other
4012 * blocking, interruptible calls in this file.
4013 */
4014 int n;
4015 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4016 *bytes = n;
4017 return 1;
4018 }
4019 }
4020 }
4021 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
4022 return 0;
4023 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
4024 return 0;
4025 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
4026 return 0;
4027 }
4028 *bytes = end - cur;
4029 return 1;
4030 }
4031
4032 int os::socket_available(int fd, jint *pbytes) {
4033 if (fd < 0)
4034 return OS_OK;
4035
4036 int ret;
4037
4038 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
4039
4040 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
4041 // is expected to return 0 on failure and 1 on success to the jdk.
4042
4043 return (ret == OS_ERR) ? 0 : 1;
4044 }
4045
4046 // Map a block of memory.
4047 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4048 char *addr, size_t bytes, bool read_only,
4049 bool allow_exec) {
4050 int prot;
4051 int flags;
4052
4053 if (read_only) {
4054 prot = PROT_READ;
4055 flags = MAP_SHARED;
4056 } else {
4057 prot = PROT_READ | PROT_WRITE;
4058 flags = MAP_PRIVATE;
4059 }
4060
4061 if (allow_exec) {
4062 prot |= PROT_EXEC;
4063 }
4064
4065 if (addr != NULL) {
4066 flags |= MAP_FIXED;
4067 }
4068
4069 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4070 fd, file_offset);
4071 if (mapped_address == MAP_FAILED) {
4072 return NULL;
4073 }
4074 return mapped_address;
4075 }
4076
4077
4078 // Remap a block of memory.
4079 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4080 char *addr, size_t bytes, bool read_only,
4081 bool allow_exec) {
4082 // same as map_memory() on this OS
4083 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4084 allow_exec);
4085 }
4086
4087
4088 // Unmap a block of memory.
4089 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4090 return munmap(addr, bytes) == 0;
4091 }
4092
4093 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4094 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4095 // of a thread.
4096 //
4097 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4098 // the fast estimate available on the platform.
4099
4100 jlong os::current_thread_cpu_time() {
4101 #ifdef __APPLE__
4102 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
4103 #else
4104 Unimplemented();
4105 return 0;
4106 #endif
4107 }
4108
4109 jlong os::thread_cpu_time(Thread* thread) {
4110 #ifdef __APPLE__
4111 return os::thread_cpu_time(thread, true /* user + sys */);
4112 #else
4113 Unimplemented();
4114 return 0;
4115 #endif
4116 }
4117
4118 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4119 #ifdef __APPLE__
4120 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4121 #else
4122 Unimplemented();
4123 return 0;
4124 #endif
4125 }
4126
4127 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4128 #ifdef __APPLE__
4129 struct thread_basic_info tinfo;
4130 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
4131 kern_return_t kr;
4132 thread_t mach_thread;
4133
4134 mach_thread = thread->osthread()->thread_id();
4135 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
4136 if (kr != KERN_SUCCESS)
4137 return -1;
4138
4139 if (user_sys_cpu_time) {
4140 jlong nanos;
4141 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
4142 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
4143 return nanos;
4144 } else {
4145 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
4146 }
4147 #else
4148 Unimplemented();
4149 return 0;
4150 #endif
4151 }
4152
4153
4154 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4155 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4156 info_ptr->may_skip_backward = false; // elapsed time not wall time
4157 info_ptr->may_skip_forward = false; // elapsed time not wall time
4158 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4159 }
4160
4161 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4162 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4163 info_ptr->may_skip_backward = false; // elapsed time not wall time
4164 info_ptr->may_skip_forward = false; // elapsed time not wall time
4165 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4166 }
4167
4168 bool os::is_thread_cpu_time_supported() {
4169 #ifdef __APPLE__
4170 return true;
4171 #else
4172 return false;
4173 #endif
4174 }
4175
4176 // System loadavg support. Returns -1 if load average cannot be obtained.
4177 // Bsd doesn't yet have a (official) notion of processor sets,
4178 // so just return the system wide load average.
4179 int os::loadavg(double loadavg[], int nelem) {
4180 return ::getloadavg(loadavg, nelem);
4181 }
4182
4183 void os::pause() {
4184 char filename[MAX_PATH];
4185 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4186 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4187 } else {
4188 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4189 }
4190
4191 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4192 if (fd != -1) {
4193 struct stat buf;
4194 ::close(fd);
4195 while (::stat(filename, &buf) == 0) {
4196 (void)::poll(NULL, 0, 100);
4197 }
4198 } else {
4199 jio_fprintf(stderr,
4200 "Could not open pause file '%s', continuing immediately.\n", filename);
4201 }
4202 }
4203
4204
4205 // Refer to the comments in os_solaris.cpp park-unpark.
4206 //
4207 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4208 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4209 // For specifics regarding the bug see GLIBC BUGID 261237 :
4210 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4211 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4212 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4213 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4214 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4215 // and monitorenter when we're using 1-0 locking. All those operations may result in
4216 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4217 // of libpthread avoids the problem, but isn't practical.
4218 //
4219 // Possible remedies:
4220 //
4221 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4222 // This is palliative and probabilistic, however. If the thread is preempted
4223 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4224 // than the minimum period may have passed, and the abstime may be stale (in the
4225 // past) resultin in a hang. Using this technique reduces the odds of a hang
4226 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4227 //
4228 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4229 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4230 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4231 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4232 // thread.
4233 //
4234 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4235 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4236 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4237 // This also works well. In fact it avoids kernel-level scalability impediments
4238 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4239 // timers in a graceful fashion.
4240 //
4241 // 4. When the abstime value is in the past it appears that control returns
4242 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4243 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4244 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4245 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4246 // It may be possible to avoid reinitialization by checking the return
4247 // value from pthread_cond_timedwait(). In addition to reinitializing the
4248 // condvar we must establish the invariant that cond_signal() is only called
4249 // within critical sections protected by the adjunct mutex. This prevents
4250 // cond_signal() from "seeing" a condvar that's in the midst of being
4251 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4252 // desirable signal-after-unlock optimization that avoids futile context switching.
4253 //
4254 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4255 // structure when a condvar is used or initialized. cond_destroy() would
4256 // release the helper structure. Our reinitialize-after-timedwait fix
4257 // put excessive stress on malloc/free and locks protecting the c-heap.
4258 //
4259 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4260 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4261 // and only enabling the work-around for vulnerable environments.
4262
4263 // utility to compute the abstime argument to timedwait:
4264 // millis is the relative timeout time
4265 // abstime will be the absolute timeout time
4266 // TODO: replace compute_abstime() with unpackTime()
4267
4268 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) {
4269 if (millis < 0) millis = 0;
4270 struct timeval now;
4271 int status = gettimeofday(&now, NULL);
4272 assert(status == 0, "gettimeofday");
4273 jlong seconds = millis / 1000;
4274 millis %= 1000;
4275 if (seconds > 50000000) { // see man cond_timedwait(3T)
4276 seconds = 50000000;
4277 }
4278 abstime->tv_sec = now.tv_sec + seconds;
4279 long usec = now.tv_usec + millis * 1000;
4280 if (usec >= 1000000) {
4281 abstime->tv_sec += 1;
4282 usec -= 1000000;
4283 }
4284 abstime->tv_nsec = usec * 1000;
4285 return abstime;
4286 }
4287
4288
4289 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4290 // Conceptually TryPark() should be equivalent to park(0).
4291
4292 int os::PlatformEvent::TryPark() {
4293 for (;;) {
4294 const int v = _Event ;
4295 guarantee ((v == 0) || (v == 1), "invariant") ;
4296 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
4297 }
4298 }
4299
4300 void os::PlatformEvent::park() { // AKA "down()"
4301 // Invariant: Only the thread associated with the Event/PlatformEvent
4302 // may call park().
4303 // TODO: assert that _Assoc != NULL or _Assoc == Self
4304 int v ;
4305 for (;;) {
4306 v = _Event ;
4307 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4308 }
4309 guarantee (v >= 0, "invariant") ;
4310 if (v == 0) {
4311 // Do this the hard way by blocking ...
4312 int status = pthread_mutex_lock(_mutex);
4313 assert_status(status == 0, status, "mutex_lock");
4314 guarantee (_nParked == 0, "invariant") ;
4315 ++ _nParked ;
4316 while (_Event < 0) {
4317 status = pthread_cond_wait(_cond, _mutex);
4318 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4319 // Treat this the same as if the wait was interrupted
4320 if (status == ETIMEDOUT) { status = EINTR; }
4321 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4322 }
4323 -- _nParked ;
4324
4325 _Event = 0 ;
4326 status = pthread_mutex_unlock(_mutex);
4327 assert_status(status == 0, status, "mutex_unlock");
4328 // Paranoia to ensure our locked and lock-free paths interact
4329 // correctly with each other.
4330 OrderAccess::fence();
4331 }
4332 guarantee (_Event >= 0, "invariant") ;
4333 }
4334
4335 int os::PlatformEvent::park(jlong millis) {
4336 guarantee (_nParked == 0, "invariant") ;
4337
4338 int v ;
4339 for (;;) {
4340 v = _Event ;
4341 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4342 }
4343 guarantee (v >= 0, "invariant") ;
4344 if (v != 0) return OS_OK ;
4345
4346 // We do this the hard way, by blocking the thread.
4347 // Consider enforcing a minimum timeout value.
4348 struct timespec abst;
4349 compute_abstime(&abst, millis);
4350
4351 int ret = OS_TIMEOUT;
4352 int status = pthread_mutex_lock(_mutex);
4353 assert_status(status == 0, status, "mutex_lock");
4354 guarantee (_nParked == 0, "invariant") ;
4355 ++_nParked ;
4356
4357 // Object.wait(timo) will return because of
4358 // (a) notification
4359 // (b) timeout
4360 // (c) thread.interrupt
4361 //
4362 // Thread.interrupt and object.notify{All} both call Event::set.
4363 // That is, we treat thread.interrupt as a special case of notification.
4364 // The underlying Solaris implementation, cond_timedwait, admits
4365 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4366 // JVM from making those visible to Java code. As such, we must
4367 // filter out spurious wakeups. We assume all ETIME returns are valid.
4368 //
4369 // TODO: properly differentiate simultaneous notify+interrupt.
4370 // In that case, we should propagate the notify to another waiter.
4371
4372 while (_Event < 0) {
4373 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst);
4374 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4375 pthread_cond_destroy (_cond);
4376 pthread_cond_init (_cond, NULL) ;
4377 }
4378 assert_status(status == 0 || status == EINTR ||
4379 status == ETIMEDOUT,
4380 status, "cond_timedwait");
4381 if (!FilterSpuriousWakeups) break ; // previous semantics
4382 if (status == ETIMEDOUT) break ;
4383 // We consume and ignore EINTR and spurious wakeups.
4384 }
4385 --_nParked ;
4386 if (_Event >= 0) {
4387 ret = OS_OK;
4388 }
4389 _Event = 0 ;
4390 status = pthread_mutex_unlock(_mutex);
4391 assert_status(status == 0, status, "mutex_unlock");
4392 assert (_nParked == 0, "invariant") ;
4393 // Paranoia to ensure our locked and lock-free paths interact
4394 // correctly with each other.
4395 OrderAccess::fence();
4396 return ret;
4397 }
4398
4399 void os::PlatformEvent::unpark() {
4400 // Transitions for _Event:
4401 // 0 :=> 1
4402 // 1 :=> 1
4403 // -1 :=> either 0 or 1; must signal target thread
4404 // That is, we can safely transition _Event from -1 to either
4405 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4406 // unpark() calls.
4407 // See also: "Semaphores in Plan 9" by Mullender & Cox
4408 //
4409 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4410 // that it will take two back-to-back park() calls for the owning
4411 // thread to block. This has the benefit of forcing a spurious return
4412 // from the first park() call after an unpark() call which will help
4413 // shake out uses of park() and unpark() without condition variables.
4414
4415 if (Atomic::xchg(1, &_Event) >= 0) return;
4416
4417 // Wait for the thread associated with the event to vacate
4418 int status = pthread_mutex_lock(_mutex);
4419 assert_status(status == 0, status, "mutex_lock");
4420 int AnyWaiters = _nParked;
4421 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4422 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) {
4423 AnyWaiters = 0;
4424 pthread_cond_signal(_cond);
4425 }
4426 status = pthread_mutex_unlock(_mutex);
4427 assert_status(status == 0, status, "mutex_unlock");
4428 if (AnyWaiters != 0) {
4429 status = pthread_cond_signal(_cond);
4430 assert_status(status == 0, status, "cond_signal");
4431 }
4432
4433 // Note that we signal() _after dropping the lock for "immortal" Events.
4434 // This is safe and avoids a common class of futile wakeups. In rare
4435 // circumstances this can cause a thread to return prematurely from
4436 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4437 // simply re-test the condition and re-park itself.
4438 }
4439
4440
4441 // JSR166
4442 // -------------------------------------------------------
4443
4444 /*
4445 * The solaris and bsd implementations of park/unpark are fairly
4446 * conservative for now, but can be improved. They currently use a
4447 * mutex/condvar pair, plus a a count.
4448 * Park decrements count if > 0, else does a condvar wait. Unpark
4449 * sets count to 1 and signals condvar. Only one thread ever waits
4450 * on the condvar. Contention seen when trying to park implies that someone
4451 * is unparking you, so don't wait. And spurious returns are fine, so there
4452 * is no need to track notifications.
4453 */
4454
4455 #define MAX_SECS 100000000
4456 /*
4457 * This code is common to bsd and solaris and will be moved to a
4458 * common place in dolphin.
4459 *
4460 * The passed in time value is either a relative time in nanoseconds
4461 * or an absolute time in milliseconds. Either way it has to be unpacked
4462 * into suitable seconds and nanoseconds components and stored in the
4463 * given timespec structure.
4464 * Given time is a 64-bit value and the time_t used in the timespec is only
4465 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4466 * overflow if times way in the future are given. Further on Solaris versions
4467 * prior to 10 there is a restriction (see cond_timedwait) that the specified
4468 * number of seconds, in abstime, is less than current_time + 100,000,000.
4469 * As it will be 28 years before "now + 100000000" will overflow we can
4470 * ignore overflow and just impose a hard-limit on seconds using the value
4471 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
4472 * years from "now".
4473 */
4474
4475 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4476 assert (time > 0, "convertTime");
4477
4478 struct timeval now;
4479 int status = gettimeofday(&now, NULL);
4480 assert(status == 0, "gettimeofday");
4481
4482 time_t max_secs = now.tv_sec + MAX_SECS;
4483
4484 if (isAbsolute) {
4485 jlong secs = time / 1000;
4486 if (secs > max_secs) {
4487 absTime->tv_sec = max_secs;
4488 }
4489 else {
4490 absTime->tv_sec = secs;
4491 }
4492 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4493 }
4494 else {
4495 jlong secs = time / NANOSECS_PER_SEC;
4496 if (secs >= MAX_SECS) {
4497 absTime->tv_sec = max_secs;
4498 absTime->tv_nsec = 0;
4499 }
4500 else {
4501 absTime->tv_sec = now.tv_sec + secs;
4502 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4503 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4504 absTime->tv_nsec -= NANOSECS_PER_SEC;
4505 ++absTime->tv_sec; // note: this must be <= max_secs
4506 }
4507 }
4508 }
4509 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4510 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4511 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4512 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4513 }
4514
4515 void Parker::park(bool isAbsolute, jlong time) {
4516 // Ideally we'd do something useful while spinning, such
4517 // as calling unpackTime().
4518
4519 // Optional fast-path check:
4520 // Return immediately if a permit is available.
4521 // We depend on Atomic::xchg() having full barrier semantics
4522 // since we are doing a lock-free update to _counter.
4523 if (Atomic::xchg(0, &_counter) > 0) return;
4524
4525 Thread* thread = Thread::current();
4526 assert(thread->is_Java_thread(), "Must be JavaThread");
4527 JavaThread *jt = (JavaThread *)thread;
4528
4529 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4530 // Check interrupt before trying to wait
4531 if (Thread::is_interrupted(thread, false)) {
4532 return;
4533 }
4534
4535 // Next, demultiplex/decode time arguments
4536 struct timespec absTime;
4537 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
4538 return;
4539 }
4540 if (time > 0) {
4541 unpackTime(&absTime, isAbsolute, time);
4542 }
4543
4544
4545 // Enter safepoint region
4546 // Beware of deadlocks such as 6317397.
4547 // The per-thread Parker:: mutex is a classic leaf-lock.
4548 // In particular a thread must never block on the Threads_lock while
4549 // holding the Parker:: mutex. If safepoints are pending both the
4550 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4551 ThreadBlockInVM tbivm(jt);
4552
4553 // Don't wait if cannot get lock since interference arises from
4554 // unblocking. Also. check interrupt before trying wait
4555 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4556 return;
4557 }
4558
4559 int status ;
4560 if (_counter > 0) { // no wait needed
4561 _counter = 0;
4562 status = pthread_mutex_unlock(_mutex);
4563 assert (status == 0, "invariant") ;
4564 // Paranoia to ensure our locked and lock-free paths interact
4565 // correctly with each other and Java-level accesses.
4566 OrderAccess::fence();
4567 return;
4568 }
4569
4570 #ifdef ASSERT
4571 // Don't catch signals while blocked; let the running threads have the signals.
4572 // (This allows a debugger to break into the running thread.)
4573 sigset_t oldsigs;
4574 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4575 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4576 #endif
4577
4578 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4579 jt->set_suspend_equivalent();
4580 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4581
4582 if (time == 0) {
4583 status = pthread_cond_wait (_cond, _mutex) ;
4584 } else {
4585 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ;
4586 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4587 pthread_cond_destroy (_cond) ;
4588 pthread_cond_init (_cond, NULL);
4589 }
4590 }
4591 assert_status(status == 0 || status == EINTR ||
4592 status == ETIMEDOUT,
4593 status, "cond_timedwait");
4594
4595 #ifdef ASSERT
4596 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4597 #endif
4598
4599 _counter = 0 ;
4600 status = pthread_mutex_unlock(_mutex) ;
4601 assert_status(status == 0, status, "invariant") ;
4602 // Paranoia to ensure our locked and lock-free paths interact
4603 // correctly with each other and Java-level accesses.
4604 OrderAccess::fence();
4605
4606 // If externally suspended while waiting, re-suspend
4607 if (jt->handle_special_suspend_equivalent_condition()) {
4608 jt->java_suspend_self();
4609 }
4610 }
4611
4612 void Parker::unpark() {
4613 int s, status ;
4614 status = pthread_mutex_lock(_mutex);
4615 assert (status == 0, "invariant") ;
4616 s = _counter;
4617 _counter = 1;
4618 if (s < 1) {
4619 if (WorkAroundNPTLTimedWaitHang) {
4620 status = pthread_cond_signal (_cond) ;
4621 assert (status == 0, "invariant") ;
4622 status = pthread_mutex_unlock(_mutex);
4623 assert (status == 0, "invariant") ;
4624 } else {
4625 status = pthread_mutex_unlock(_mutex);
4626 assert (status == 0, "invariant") ;
4627 status = pthread_cond_signal (_cond) ;
4628 assert (status == 0, "invariant") ;
4629 }
4630 } else {
4631 pthread_mutex_unlock(_mutex);
4632 assert (status == 0, "invariant") ;
4633 }
4634 }
4635
4636
4637 /* Darwin has no "environ" in a dynamic library. */
4638 #ifdef __APPLE__
4639 #include <crt_externs.h>
4640 #define environ (*_NSGetEnviron())
4641 #else
4642 extern char** environ;
4643 #endif
4644
4645 // Run the specified command in a separate process. Return its exit value,
4646 // or -1 on failure (e.g. can't fork a new process).
4647 // Unlike system(), this function can be called from signal handler. It
4648 // doesn't block SIGINT et al.
4649 int os::fork_and_exec(char* cmd) {
4650 const char * argv[4] = {"sh", "-c", cmd, NULL};
4651
4652 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4653 // pthread_atfork handlers and reset pthread library. All we need is a
4654 // separate process to execve. Make a direct syscall to fork process.
4655 // On IA64 there's no fork syscall, we have to use fork() and hope for
4656 // the best...
4657 pid_t pid = fork();
4658
4659 if (pid < 0) {
4660 // fork failed
4661 return -1;
4662
4663 } else if (pid == 0) {
4664 // child process
4665
4666 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4667 // first to kill every thread on the thread list. Because this list is
4668 // not reset by fork() (see notes above), execve() will instead kill
4669 // every thread in the parent process. We know this is the only thread
4670 // in the new process, so make a system call directly.
4671 // IA64 should use normal execve() from glibc to match the glibc fork()
4672 // above.
4673 execve("/bin/sh", (char* const*)argv, environ);
4674
4675 // execve failed
4676 _exit(-1);
4677
4678 } else {
4679 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4680 // care about the actual exit code, for now.
4681
4682 int status;
4683
4684 // Wait for the child process to exit. This returns immediately if
4685 // the child has already exited. */
4686 while (waitpid(pid, &status, 0) < 0) {
4687 switch (errno) {
4688 case ECHILD: return 0;
4689 case EINTR: break;
4690 default: return -1;
4691 }
4692 }
4693
4694 if (WIFEXITED(status)) {
4695 // The child exited normally; get its exit code.
4696 return WEXITSTATUS(status);
4697 } else if (WIFSIGNALED(status)) {
4698 // The child exited because of a signal
4699 // The best value to return is 0x80 + signal number,
4700 // because that is what all Unix shells do, and because
4701 // it allows callers to distinguish between process exit and
4702 // process death by signal.
4703 return 0x80 + WTERMSIG(status);
4704 } else {
4705 // Unknown exit code; pass it through
4706 return status;
4707 }
4708 }
4709 }
4710
4711 // is_headless_jre()
4712 //
4713 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4714 // in order to report if we are running in a headless jre
4715 //
4716 // Since JDK8 xawt/libmawt.so was moved into the same directory
4717 // as libawt.so, and renamed libawt_xawt.so
4718 //
4719 bool os::is_headless_jre() {
4720 struct stat statbuf;
4721 char buf[MAXPATHLEN];
4722 char libmawtpath[MAXPATHLEN];
4723 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4724 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4725 char *p;
4726
4727 // Get path to libjvm.so
4728 os::jvm_path(buf, sizeof(buf));
4729
4730 // Get rid of libjvm.so
4731 p = strrchr(buf, '/');
4732 if (p == NULL) return false;
4733 else *p = '\0';
4734
4735 // Get rid of client or server
4736 p = strrchr(buf, '/');
4737 if (p == NULL) return false;
4738 else *p = '\0';
4739
4740 // check xawt/libmawt.so
4741 strcpy(libmawtpath, buf);
4742 strcat(libmawtpath, xawtstr);
4743 if (::stat(libmawtpath, &statbuf) == 0) return false;
4744
4745 // check libawt_xawt.so
4746 strcpy(libmawtpath, buf);
4747 strcat(libmawtpath, new_xawtstr);
4748 if (::stat(libmawtpath, &statbuf) == 0) return false;
4749
4750 return true;
4751 }
4752
4753 // Get the default path to the core file
4754 // Returns the length of the string
4755 int os::get_core_path(char* buffer, size_t bufferSize) {
4756 int n = jio_snprintf(buffer, bufferSize, "/cores");
4757
4758 // Truncate if theoretical string was longer than bufferSize
4759 n = MIN2(n, (int)bufferSize);
4760
4761 return n;
4762 }
4763
4764 #ifndef PRODUCT
4765 void TestReserveMemorySpecial_test() {
4766 // No tests available for this platform
4767 }
4768 #endif