1 /*
2 * Copyright (c) 1999, 2019, 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 "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_bsd.inline.hpp"
41 #include "os_posix.inline.hpp"
42 #include "os_share_bsd.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/semaphore.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/statSampler.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/threadCritical.hpp"
63 #include "runtime/timer.hpp"
64 #include "services/attachListener.hpp"
65 #include "services/memTracker.hpp"
66 #include "services/runtimeService.hpp"
67 #include "utilities/align.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/vmError.hpp"
73
74 // put OS-includes here
75 # include <dlfcn.h>
76 # include <errno.h>
77 # include <fcntl.h>
78 # include <inttypes.h>
79 # include <poll.h>
80 # include <pthread.h>
81 # include <pwd.h>
82 # include <signal.h>
83 # include <stdint.h>
84 # include <stdio.h>
85 # include <string.h>
86 # include <sys/ioctl.h>
87 # include <sys/mman.h>
88 # include <sys/param.h>
89 # include <sys/resource.h>
90 # include <sys/socket.h>
91 # include <sys/stat.h>
92 # include <sys/syscall.h>
93 # include <sys/sysctl.h>
94 # include <sys/time.h>
95 # include <sys/times.h>
96 # include <sys/types.h>
97 # include <sys/wait.h>
98 # include <time.h>
99 # include <unistd.h>
100
101 #if defined(__FreeBSD__) || defined(__NetBSD__)
102 #include <elf.h>
103 #endif
104
105 #ifdef __APPLE__
106 #include <mach-o/dyld.h>
107 #endif
108
109 #ifndef MAP_ANONYMOUS
110 #define MAP_ANONYMOUS MAP_ANON
111 #endif
112
113 #define MAX_PATH (2 * K)
114
115 // for timer info max values which include all bits
116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
117
118 ////////////////////////////////////////////////////////////////////////////////
119 // global variables
120 julong os::Bsd::_physical_memory = 0;
121
122 #ifdef __APPLE__
123 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
124 volatile uint64_t os::Bsd::_max_abstime = 0;
125 #else
126 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
127 #endif
128 pthread_t os::Bsd::_main_thread;
129 int os::Bsd::_page_size = -1;
130
131 static jlong initial_time_count=0;
132
133 static int clock_tics_per_sec = 100;
134
135 // For diagnostics to print a message once. see run_periodic_checks
136 static sigset_t check_signal_done;
137 static bool check_signals = true;
138
139 static pid_t _initial_pid = 0;
140
141 // Signal number used to suspend/resume a thread
142
143 // do not use any signal number less than SIGSEGV, see 4355769
144 static int SR_signum = SIGUSR2;
145 sigset_t SR_sigset;
146
147
148 ////////////////////////////////////////////////////////////////////////////////
149 // utility functions
150
151 static int SR_initialize();
152
153 julong os::available_memory() {
154 return Bsd::available_memory();
155 }
156
157 // available here means free
158 julong os::Bsd::available_memory() {
159 uint64_t available = physical_memory() >> 2;
160 #ifdef __APPLE__
161 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
162 vm_statistics64_data_t vmstat;
163 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
164 (host_info64_t)&vmstat, &count);
165 assert(kerr == KERN_SUCCESS,
166 "host_statistics64 failed - check mach_host_self() and 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 // Return true if user is running as root.
179
180 bool os::have_special_privileges() {
181 static bool init = false;
182 static bool privileges = false;
183 if (!init) {
184 privileges = (getuid() != geteuid()) || (getgid() != getegid());
185 init = true;
186 }
187 return privileges;
188 }
189
190
191
192 // Cpu architecture string
193 #if defined(ZERO)
194 static char cpu_arch[] = ZERO_LIBARCH;
195 #elif defined(IA64)
196 static char cpu_arch[] = "ia64";
197 #elif defined(IA32)
198 static char cpu_arch[] = "i386";
199 #elif defined(AMD64)
200 static char cpu_arch[] = "amd64";
201 #elif defined(ARM)
202 static char cpu_arch[] = "arm";
203 #elif defined(PPC32)
204 static char cpu_arch[] = "ppc";
205 #elif defined(SPARC)
206 #ifdef _LP64
207 static char cpu_arch[] = "sparcv9";
208 #else
209 static char cpu_arch[] = "sparc";
210 #endif
211 #else
212 #error Add appropriate cpu_arch setting
213 #endif
214
215 // Compiler variant
216 #ifdef COMPILER2
217 #define COMPILER_VARIANT "server"
218 #else
219 #define COMPILER_VARIANT "client"
220 #endif
221
222
223 void os::Bsd::initialize_system_info() {
224 int mib[2];
225 size_t len;
226 int cpu_val;
227 julong mem_val;
228
229 // get processors count via hw.ncpus sysctl
230 mib[0] = CTL_HW;
231 mib[1] = HW_NCPU;
232 len = sizeof(cpu_val);
233 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
234 assert(len == sizeof(cpu_val), "unexpected data size");
235 set_processor_count(cpu_val);
236 } else {
237 set_processor_count(1); // fallback
238 }
239
240 // get physical memory via hw.memsize sysctl (hw.memsize is used
241 // since it returns a 64 bit value)
242 mib[0] = CTL_HW;
243
244 #if defined (HW_MEMSIZE) // Apple
245 mib[1] = HW_MEMSIZE;
246 #elif defined(HW_PHYSMEM) // Most of BSD
247 mib[1] = HW_PHYSMEM;
248 #elif defined(HW_REALMEM) // Old FreeBSD
249 mib[1] = HW_REALMEM;
250 #else
251 #error No ways to get physmem
252 #endif
253
254 len = sizeof(mem_val);
255 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
256 assert(len == sizeof(mem_val), "unexpected data size");
257 _physical_memory = mem_val;
258 } else {
259 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
260 }
261
262 #ifdef __OpenBSD__
263 {
264 // limit _physical_memory memory view on OpenBSD since
265 // datasize rlimit restricts us anyway.
266 struct rlimit limits;
267 getrlimit(RLIMIT_DATA, &limits);
268 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
269 }
270 #endif
271 }
272
273 #ifdef __APPLE__
274 static const char *get_home() {
275 const char *home_dir = ::getenv("HOME");
276 if ((home_dir == NULL) || (*home_dir == '\0')) {
277 struct passwd *passwd_info = getpwuid(geteuid());
278 if (passwd_info != NULL) {
279 home_dir = passwd_info->pw_dir;
280 }
281 }
282
283 return home_dir;
284 }
285 #endif
286
287 void os::init_system_properties_values() {
288 // The next steps are taken in the product version:
289 //
290 // Obtain the JAVA_HOME value from the location of libjvm.so.
291 // This library should be located at:
292 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
293 //
294 // If "/jre/lib/" appears at the right place in the path, then we
295 // assume libjvm.so is installed in a JDK and we use this path.
296 //
297 // Otherwise exit with message: "Could not create the Java virtual machine."
298 //
299 // The following extra steps are taken in the debugging version:
300 //
301 // If "/jre/lib/" does NOT appear at the right place in the path
302 // instead of exit check for $JAVA_HOME environment variable.
303 //
304 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
305 // then we append a fake suffix "hotspot/libjvm.so" to this path so
306 // it looks like libjvm.so is installed there
307 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
308 //
309 // Otherwise exit.
310 //
311 // Important note: if the location of libjvm.so changes this
312 // code needs to be changed accordingly.
313
314 // See ld(1):
315 // The linker uses the following search paths to locate required
316 // shared libraries:
317 // 1: ...
318 // ...
319 // 7: The default directories, normally /lib and /usr/lib.
320 #ifndef DEFAULT_LIBPATH
321 #ifndef OVERRIDE_LIBPATH
322 #define DEFAULT_LIBPATH "/lib:/usr/lib"
323 #else
324 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
325 #endif
326 #endif
327
328 // Base path of extensions installed on the system.
329 #define SYS_EXT_DIR "/usr/java/packages"
330 #define EXTENSIONS_DIR "/lib/ext"
331
332 #ifndef __APPLE__
333
334 // Buffer that fits several sprintfs.
335 // Note that the space for the colon and the trailing null are provided
336 // by the nulls included by the sizeof operator.
337 const size_t bufsize =
338 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
339 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
340 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
341
342 // sysclasspath, java_home, dll_dir
343 {
344 char *pslash;
345 os::jvm_path(buf, bufsize);
346
347 // Found the full path to libjvm.so.
348 // Now cut the path to <java_home>/jre if we can.
349 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
350 pslash = strrchr(buf, '/');
351 if (pslash != NULL) {
352 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
353 }
354 Arguments::set_dll_dir(buf);
355
356 if (pslash != NULL) {
357 pslash = strrchr(buf, '/');
358 if (pslash != NULL) {
359 *pslash = '\0'; // Get rid of /<arch>.
360 pslash = strrchr(buf, '/');
361 if (pslash != NULL) {
362 *pslash = '\0'; // Get rid of /lib.
363 }
364 }
365 }
366 Arguments::set_java_home(buf);
367 if (!set_boot_path('/', ':')) {
368 vm_exit_during_initialization("Failed setting boot class path.", NULL);
369 }
370 }
371
372 // Where to look for native libraries.
373 //
374 // Note: Due to a legacy implementation, most of the library path
375 // is set in the launcher. This was to accomodate linking restrictions
376 // on legacy Bsd implementations (which are no longer supported).
377 // Eventually, all the library path setting will be done here.
378 //
379 // However, to prevent the proliferation of improperly built native
380 // libraries, the new path component /usr/java/packages is added here.
381 // Eventually, all the library path setting will be done here.
382 {
383 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
384 // should always exist (until the legacy problem cited above is
385 // addressed).
386 const char *v = ::getenv("LD_LIBRARY_PATH");
387 const char *v_colon = ":";
388 if (v == NULL) { v = ""; v_colon = ""; }
389 // That's +1 for the colon and +1 for the trailing '\0'.
390 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
391 strlen(v) + 1 +
392 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
393 mtInternal);
394 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
395 Arguments::set_library_path(ld_library_path);
396 FREE_C_HEAP_ARRAY(char, ld_library_path);
397 }
398
399 // Extensions directories.
400 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
401 Arguments::set_ext_dirs(buf);
402
403 FREE_C_HEAP_ARRAY(char, buf);
404
405 #else // __APPLE__
406
407 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
408 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
409
410 const char *user_home_dir = get_home();
411 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
412 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
413 sizeof(SYS_EXTENSIONS_DIRS);
414
415 // Buffer that fits several sprintfs.
416 // Note that the space for the colon and the trailing null are provided
417 // by the nulls included by the sizeof operator.
418 const size_t bufsize =
419 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
420 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
421 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
422
423 // sysclasspath, java_home, dll_dir
424 {
425 char *pslash;
426 os::jvm_path(buf, bufsize);
427
428 // Found the full path to libjvm.so.
429 // Now cut the path to <java_home>/jre if we can.
430 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
431 pslash = strrchr(buf, '/');
432 if (pslash != NULL) {
433 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
434 }
435 #ifdef STATIC_BUILD
436 strcat(buf, "/lib");
437 #endif
438
439 Arguments::set_dll_dir(buf);
440
441 if (pslash != NULL) {
442 pslash = strrchr(buf, '/');
443 if (pslash != NULL) {
444 *pslash = '\0'; // Get rid of /lib.
445 }
446 }
447 Arguments::set_java_home(buf);
448 set_boot_path('/', ':');
449 }
450
451 // Where to look for native libraries.
452 //
453 // Note: Due to a legacy implementation, most of the library path
454 // is set in the launcher. This was to accomodate linking restrictions
455 // on legacy Bsd implementations (which are no longer supported).
456 // Eventually, all the library path setting will be done here.
457 //
458 // However, to prevent the proliferation of improperly built native
459 // libraries, the new path component /usr/java/packages is added here.
460 // Eventually, all the library path setting will be done here.
461 {
462 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
463 // should always exist (until the legacy problem cited above is
464 // addressed).
465 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
466 // can specify a directory inside an app wrapper
467 const char *l = ::getenv("JAVA_LIBRARY_PATH");
468 const char *l_colon = ":";
469 if (l == NULL) { l = ""; l_colon = ""; }
470
471 const char *v = ::getenv("DYLD_LIBRARY_PATH");
472 const char *v_colon = ":";
473 if (v == NULL) { v = ""; v_colon = ""; }
474
475 // Apple's Java6 has "." at the beginning of java.library.path.
476 // OpenJDK on Windows has "." at the end of java.library.path.
477 // OpenJDK on Linux and Solaris don't have "." in java.library.path
478 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
479 // "." is appended to the end of java.library.path. Yes, this
480 // could cause a change in behavior, but Apple's Java6 behavior
481 // can be achieved by putting "." at the beginning of the
482 // JAVA_LIBRARY_PATH environment variable.
483 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
484 strlen(v) + 1 + strlen(l) + 1 +
485 system_ext_size + 3,
486 mtInternal);
487 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
488 v, v_colon, l, l_colon, user_home_dir);
489 Arguments::set_library_path(ld_library_path);
490 FREE_C_HEAP_ARRAY(char, ld_library_path);
491 }
492
493 // Extensions directories.
494 //
495 // Note that the space for the colon and the trailing null are provided
496 // by the nulls included by the sizeof operator (so actually one byte more
497 // than necessary is allocated).
498 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
499 user_home_dir, Arguments::get_java_home());
500 Arguments::set_ext_dirs(buf);
501
502 FREE_C_HEAP_ARRAY(char, buf);
503
504 #undef SYS_EXTENSIONS_DIR
505 #undef SYS_EXTENSIONS_DIRS
506
507 #endif // __APPLE__
508
509 #undef SYS_EXT_DIR
510 #undef EXTENSIONS_DIR
511 }
512
513 ////////////////////////////////////////////////////////////////////////////////
514 // breakpoint support
515
516 void os::breakpoint() {
517 BREAKPOINT;
518 }
519
520 extern "C" void breakpoint() {
521 // use debugger to set breakpoint here
522 }
523
524 ////////////////////////////////////////////////////////////////////////////////
525 // signal support
526
527 debug_only(static bool signal_sets_initialized = false);
528 static sigset_t unblocked_sigs, vm_sigs;
529
530 void os::Bsd::signal_sets_init() {
531 // Should also have an assertion stating we are still single-threaded.
532 assert(!signal_sets_initialized, "Already initialized");
533 // Fill in signals that are necessarily unblocked for all threads in
534 // the VM. Currently, we unblock the following signals:
535 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
536 // by -Xrs (=ReduceSignalUsage));
537 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
538 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
539 // the dispositions or masks wrt these signals.
540 // Programs embedding the VM that want to use the above signals for their
541 // own purposes must, at this time, use the "-Xrs" option to prevent
542 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
543 // (See bug 4345157, and other related bugs).
544 // In reality, though, unblocking these signals is really a nop, since
545 // these signals are not blocked by default.
546 sigemptyset(&unblocked_sigs);
547 sigaddset(&unblocked_sigs, SIGILL);
548 sigaddset(&unblocked_sigs, SIGSEGV);
549 sigaddset(&unblocked_sigs, SIGBUS);
550 sigaddset(&unblocked_sigs, SIGFPE);
551 sigaddset(&unblocked_sigs, SR_signum);
552
553 if (!ReduceSignalUsage) {
554 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
555 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
556
557 }
558 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
559 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
560 }
561 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
562 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
563 }
564 }
565 // Fill in signals that are blocked by all but the VM thread.
566 sigemptyset(&vm_sigs);
567 if (!ReduceSignalUsage) {
568 sigaddset(&vm_sigs, BREAK_SIGNAL);
569 }
570 debug_only(signal_sets_initialized = true);
571
572 }
573
574 // These are signals that are unblocked while a thread is running Java.
575 // (For some reason, they get blocked by default.)
576 sigset_t* os::Bsd::unblocked_signals() {
577 assert(signal_sets_initialized, "Not initialized");
578 return &unblocked_sigs;
579 }
580
581 // These are the signals that are blocked while a (non-VM) thread is
582 // running Java. Only the VM thread handles these signals.
583 sigset_t* os::Bsd::vm_signals() {
584 assert(signal_sets_initialized, "Not initialized");
585 return &vm_sigs;
586 }
587
588 void os::Bsd::hotspot_sigmask(Thread* thread) {
589
590 //Save caller's signal mask before setting VM signal mask
591 sigset_t caller_sigmask;
592 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
593
594 OSThread* osthread = thread->osthread();
595 osthread->set_caller_sigmask(caller_sigmask);
596
597 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
598
599 if (!ReduceSignalUsage) {
600 if (thread->is_VM_thread()) {
601 // Only the VM thread handles BREAK_SIGNAL ...
602 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
603 } else {
604 // ... all other threads block BREAK_SIGNAL
605 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
606 }
607 }
608 }
609
610
611 //////////////////////////////////////////////////////////////////////////////
612 // create new thread
613
614 #ifdef __APPLE__
615 // library handle for calling objc_registerThreadWithCollector()
616 // without static linking to the libobjc library
617 #define OBJC_LIB "/usr/lib/libobjc.dylib"
618 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
619 typedef void (*objc_registerThreadWithCollector_t)();
620 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
621 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
622 #endif
623
624 #ifdef __APPLE__
625 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
626 // Additional thread_id used to correlate threads in SA
627 thread_identifier_info_data_t m_ident_info;
628 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
629
630 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
631 (thread_info_t) &m_ident_info, &count);
632
633 return m_ident_info.thread_id;
634 }
635 #endif
636
637 // Thread start routine for all newly created threads
638 static void *thread_native_entry(Thread *thread) {
639
640 thread->record_stack_base_and_size();
641
642 // Try to randomize the cache line index of hot stack frames.
643 // This helps when threads of the same stack traces evict each other's
644 // cache lines. The threads can be either from the same JVM instance, or
645 // from different JVM instances. The benefit is especially true for
646 // processors with hyperthreading technology.
647 static int counter = 0;
648 int pid = os::current_process_id();
649 alloca(((pid ^ counter++) & 7) * 128);
650
651 thread->initialize_thread_current();
652
653 OSThread* osthread = thread->osthread();
654 Monitor* sync = osthread->startThread_lock();
655
656 osthread->set_thread_id(os::Bsd::gettid());
657
658 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
659 os::current_thread_id(), (uintx) pthread_self());
660
661 #ifdef __APPLE__
662 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
663 guarantee(unique_thread_id != 0, "unique thread id was not found");
664 osthread->set_unique_thread_id(unique_thread_id);
665 #endif
666 // initialize signal mask for this thread
667 os::Bsd::hotspot_sigmask(thread);
668
669 // initialize floating point control register
670 os::Bsd::init_thread_fpu_state();
671
672 #ifdef __APPLE__
673 // register thread with objc gc
674 if (objc_registerThreadWithCollectorFunction != NULL) {
675 objc_registerThreadWithCollectorFunction();
676 }
677 #endif
678
679 // handshaking with parent thread
680 {
681 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
682
683 // notify parent thread
684 osthread->set_state(INITIALIZED);
685 sync->notify_all();
686
687 // wait until os::start_thread()
688 while (osthread->get_state() == INITIALIZED) {
689 sync->wait_without_safepoint_check();
690 }
691 }
692
693 // call one more level start routine
694 thread->call_run();
695
696 // Note: at this point the thread object may already have deleted itself.
697 // Prevent dereferencing it from here on out.
698 thread = NULL;
699
700 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
701 os::current_thread_id(), (uintx) pthread_self());
702
703 return 0;
704 }
705
706 bool os::create_thread(Thread* thread, ThreadType thr_type,
707 size_t req_stack_size) {
708 assert(thread->osthread() == NULL, "caller responsible");
709
710 // Allocate the OSThread object
711 OSThread* osthread = new OSThread(NULL, NULL);
712 if (osthread == NULL) {
713 return false;
714 }
715
716 // set the correct thread state
717 osthread->set_thread_type(thr_type);
718
719 // Initial state is ALLOCATED but not INITIALIZED
720 osthread->set_state(ALLOCATED);
721
722 thread->set_osthread(osthread);
723
724 // init thread attributes
725 pthread_attr_t attr;
726 pthread_attr_init(&attr);
727 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
728
729 // calculate stack size if it's not specified by caller
730 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
731 int status = pthread_attr_setstacksize(&attr, stack_size);
732 assert_status(status == 0, status, "pthread_attr_setstacksize");
733
734 ThreadState state;
735
736 {
737 pthread_t tid;
738 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
739
740 char buf[64];
741 if (ret == 0) {
742 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
743 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
744 } else {
745 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
746 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
747 // Log some OS information which might explain why creating the thread failed.
748 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
749 LogStream st(Log(os, thread)::info());
750 os::Posix::print_rlimit_info(&st);
751 os::print_memory_info(&st);
752 }
753
754 pthread_attr_destroy(&attr);
755
756 if (ret != 0) {
757 // Need to clean up stuff we've allocated so far
758 thread->set_osthread(NULL);
759 delete osthread;
760 return false;
761 }
762
763 // Store pthread info into the OSThread
764 osthread->set_pthread_id(tid);
765
766 // Wait until child thread is either initialized or aborted
767 {
768 Monitor* sync_with_child = osthread->startThread_lock();
769 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
770 while ((state = osthread->get_state()) == ALLOCATED) {
771 sync_with_child->wait_without_safepoint_check();
772 }
773 }
774
775 }
776
777 // Aborted due to thread limit being reached
778 if (state == ZOMBIE) {
779 thread->set_osthread(NULL);
780 delete osthread;
781 return false;
782 }
783
784 // The thread is returned suspended (in state INITIALIZED),
785 // and is started higher up in the call chain
786 assert(state == INITIALIZED, "race condition");
787 return true;
788 }
789
790 /////////////////////////////////////////////////////////////////////////////
791 // attach existing thread
792
793 // bootstrap the main thread
794 bool os::create_main_thread(JavaThread* thread) {
795 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
796 return create_attached_thread(thread);
797 }
798
799 bool os::create_attached_thread(JavaThread* thread) {
800 #ifdef ASSERT
801 thread->verify_not_published();
802 #endif
803
804 // Allocate the OSThread object
805 OSThread* osthread = new OSThread(NULL, NULL);
806
807 if (osthread == NULL) {
808 return false;
809 }
810
811 osthread->set_thread_id(os::Bsd::gettid());
812
813 // Store pthread info into the OSThread
814 #ifdef __APPLE__
815 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
816 guarantee(unique_thread_id != 0, "just checking");
817 osthread->set_unique_thread_id(unique_thread_id);
818 #endif
819 osthread->set_pthread_id(::pthread_self());
820
821 // initialize floating point control register
822 os::Bsd::init_thread_fpu_state();
823
824 // Initial thread state is RUNNABLE
825 osthread->set_state(RUNNABLE);
826
827 thread->set_osthread(osthread);
828
829 // initialize signal mask for this thread
830 // and save the caller's signal mask
831 os::Bsd::hotspot_sigmask(thread);
832
833 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
834 os::current_thread_id(), (uintx) pthread_self());
835
836 return true;
837 }
838
839 void os::pd_start_thread(Thread* thread) {
840 OSThread * osthread = thread->osthread();
841 assert(osthread->get_state() != INITIALIZED, "just checking");
842 Monitor* sync_with_child = osthread->startThread_lock();
843 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
844 sync_with_child->notify();
845 }
846
847 // Free Bsd resources related to the OSThread
848 void os::free_thread(OSThread* osthread) {
849 assert(osthread != NULL, "osthread not set");
850
851 // We are told to free resources of the argument thread,
852 // but we can only really operate on the current thread.
853 assert(Thread::current()->osthread() == osthread,
854 "os::free_thread but not current thread");
855
856 // Restore caller's signal mask
857 sigset_t sigmask = osthread->caller_sigmask();
858 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
859
860 delete osthread;
861 }
862
863 ////////////////////////////////////////////////////////////////////////////////
864 // time support
865
866 // Time since start-up in seconds to a fine granularity.
867 // Used by VMSelfDestructTimer and the MemProfiler.
868 double os::elapsedTime() {
869
870 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
871 }
872
873 jlong os::elapsed_counter() {
874 return javaTimeNanos() - initial_time_count;
875 }
876
877 jlong os::elapsed_frequency() {
878 return NANOSECS_PER_SEC; // nanosecond resolution
879 }
880
881 bool os::supports_vtime() { return true; }
882 bool os::enable_vtime() { return false; }
883 bool os::vtime_enabled() { return false; }
884
885 double os::elapsedVTime() {
886 // better than nothing, but not much
887 return elapsedTime();
888 }
889
890 jlong os::javaTimeMillis() {
891 timeval time;
892 int status = gettimeofday(&time, NULL);
893 assert(status != -1, "bsd error");
894 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
895 }
896
897 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
898 timeval time;
899 int status = gettimeofday(&time, NULL);
900 assert(status != -1, "bsd error");
901 seconds = jlong(time.tv_sec);
902 nanos = jlong(time.tv_usec) * 1000;
903 }
904
905 #ifndef __APPLE__
906 #ifndef CLOCK_MONOTONIC
907 #define CLOCK_MONOTONIC (1)
908 #endif
909 #endif
910
911 #ifdef __APPLE__
912 void os::Bsd::clock_init() {
913 mach_timebase_info(&_timebase_info);
914 }
915 #else
916 void os::Bsd::clock_init() {
917 struct timespec res;
918 struct timespec tp;
919 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
920 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
921 // yes, monotonic clock is supported
922 _clock_gettime = ::clock_gettime;
923 }
924 }
925 #endif
926
927
928
929 #ifdef __APPLE__
930
931 jlong os::javaTimeNanos() {
932 const uint64_t tm = mach_absolute_time();
933 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
934 const uint64_t prev = Bsd::_max_abstime;
935 if (now <= prev) {
936 return prev; // same or retrograde time;
937 }
938 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
939 assert(obsv >= prev, "invariant"); // Monotonicity
940 // If the CAS succeeded then we're done and return "now".
941 // If the CAS failed and the observed value "obsv" is >= now then
942 // we should return "obsv". If the CAS failed and now > obsv > prv then
943 // some other thread raced this thread and installed a new value, in which case
944 // we could either (a) retry the entire operation, (b) retry trying to install now
945 // or (c) just return obsv. We use (c). No loop is required although in some cases
946 // we might discard a higher "now" value in deference to a slightly lower but freshly
947 // installed obsv value. That's entirely benign -- it admits no new orderings compared
948 // to (a) or (b) -- and greatly reduces coherence traffic.
949 // We might also condition (c) on the magnitude of the delta between obsv and now.
950 // Avoiding excessive CAS operations to hot RW locations is critical.
951 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
952 return (prev == obsv) ? now : obsv;
953 }
954
955 #else // __APPLE__
956
957 jlong os::javaTimeNanos() {
958 if (os::supports_monotonic_clock()) {
959 struct timespec tp;
960 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
961 assert(status == 0, "gettime error");
962 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
963 return result;
964 } else {
965 timeval time;
966 int status = gettimeofday(&time, NULL);
967 assert(status != -1, "bsd error");
968 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
969 return 1000 * usecs;
970 }
971 }
972
973 #endif // __APPLE__
974
975 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
976 if (os::supports_monotonic_clock()) {
977 info_ptr->max_value = ALL_64_BITS;
978
979 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
980 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
981 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
982 } else {
983 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
984 info_ptr->max_value = ALL_64_BITS;
985
986 // gettimeofday is a real time clock so it skips
987 info_ptr->may_skip_backward = true;
988 info_ptr->may_skip_forward = true;
989 }
990
991 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
992 }
993
994 // Return the real, user, and system times in seconds from an
995 // arbitrary fixed point in the past.
996 bool os::getTimesSecs(double* process_real_time,
997 double* process_user_time,
998 double* process_system_time) {
999 struct tms ticks;
1000 clock_t real_ticks = times(&ticks);
1001
1002 if (real_ticks == (clock_t) (-1)) {
1003 return false;
1004 } else {
1005 double ticks_per_second = (double) clock_tics_per_sec;
1006 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1007 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1008 *process_real_time = ((double) real_ticks) / ticks_per_second;
1009
1010 return true;
1011 }
1012 }
1013
1014
1015 char * os::local_time_string(char *buf, size_t buflen) {
1016 struct tm t;
1017 time_t long_time;
1018 time(&long_time);
1019 localtime_r(&long_time, &t);
1020 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1021 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1022 t.tm_hour, t.tm_min, t.tm_sec);
1023 return buf;
1024 }
1025
1026 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1027 return localtime_r(clock, res);
1028 }
1029
1030 ////////////////////////////////////////////////////////////////////////////////
1031 // runtime exit support
1032
1033 // Note: os::shutdown() might be called very early during initialization, or
1034 // called from signal handler. Before adding something to os::shutdown(), make
1035 // sure it is async-safe and can handle partially initialized VM.
1036 void os::shutdown() {
1037
1038 // allow PerfMemory to attempt cleanup of any persistent resources
1039 perfMemory_exit();
1040
1041 // needs to remove object in file system
1042 AttachListener::abort();
1043
1044 // flush buffered output, finish log files
1045 ostream_abort();
1046
1047 // Check for abort hook
1048 abort_hook_t abort_hook = Arguments::abort_hook();
1049 if (abort_hook != NULL) {
1050 abort_hook();
1051 }
1052
1053 }
1054
1055 // Note: os::abort() might be called very early during initialization, or
1056 // called from signal handler. Before adding something to os::abort(), make
1057 // sure it is async-safe and can handle partially initialized VM.
1058 void os::abort(bool dump_core, void* siginfo, const void* context) {
1059 os::shutdown();
1060 if (dump_core) {
1061 #ifndef PRODUCT
1062 fdStream out(defaultStream::output_fd());
1063 out.print_raw("Current thread is ");
1064 char buf[16];
1065 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1066 out.print_raw_cr(buf);
1067 out.print_raw_cr("Dumping core ...");
1068 #endif
1069 ::abort(); // dump core
1070 }
1071
1072 ::exit(1);
1073 }
1074
1075 // Die immediately, no exit hook, no abort hook, no cleanup.
1076 // Dump a core file, if possible, for debugging.
1077 void os::die() {
1078 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1079 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1080 // and don't take the time to generate a core file.
1081 os::signal_raise(SIGKILL);
1082 } else {
1083 // _exit() on BsdThreads only kills current thread
1084 ::abort();
1085 }
1086 }
1087
1088 // Information of current thread in variety of formats
1089 pid_t os::Bsd::gettid() {
1090 int retval = -1;
1091
1092 #ifdef __APPLE__ //XNU kernel
1093 // despite the fact mach port is actually not a thread id use it
1094 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1095 retval = ::pthread_mach_thread_np(::pthread_self());
1096 guarantee(retval != 0, "just checking");
1097 return retval;
1098
1099 #else
1100 #ifdef __FreeBSD__
1101 retval = syscall(SYS_thr_self);
1102 #else
1103 #ifdef __OpenBSD__
1104 retval = syscall(SYS_getthrid);
1105 #else
1106 #ifdef __NetBSD__
1107 retval = (pid_t) syscall(SYS__lwp_self);
1108 #endif
1109 #endif
1110 #endif
1111 #endif
1112
1113 if (retval == -1) {
1114 return getpid();
1115 }
1116 }
1117
1118 intx os::current_thread_id() {
1119 #ifdef __APPLE__
1120 return (intx)::pthread_mach_thread_np(::pthread_self());
1121 #else
1122 return (intx)::pthread_self();
1123 #endif
1124 }
1125
1126 int os::current_process_id() {
1127
1128 // Under the old bsd thread library, bsd gives each thread
1129 // its own process id. Because of this each thread will return
1130 // a different pid if this method were to return the result
1131 // of getpid(2). Bsd provides no api that returns the pid
1132 // of the launcher thread for the vm. This implementation
1133 // returns a unique pid, the pid of the launcher thread
1134 // that starts the vm 'process'.
1135
1136 // Under the NPTL, getpid() returns the same pid as the
1137 // launcher thread rather than a unique pid per thread.
1138 // Use gettid() if you want the old pre NPTL behaviour.
1139
1140 // if you are looking for the result of a call to getpid() that
1141 // returns a unique pid for the calling thread, then look at the
1142 // OSThread::thread_id() method in osThread_bsd.hpp file
1143
1144 return (int)(_initial_pid ? _initial_pid : getpid());
1145 }
1146
1147 // DLL functions
1148
1149 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1150
1151 // This must be hard coded because it's the system's temporary
1152 // directory not the java application's temp directory, ala java.io.tmpdir.
1153 #ifdef __APPLE__
1154 // macosx has a secure per-user temporary directory
1155 char temp_path_storage[PATH_MAX];
1156 const char* os::get_temp_directory() {
1157 static char *temp_path = NULL;
1158 if (temp_path == NULL) {
1159 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1160 if (pathSize == 0 || pathSize > PATH_MAX) {
1161 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1162 }
1163 temp_path = temp_path_storage;
1164 }
1165 return temp_path;
1166 }
1167 #else // __APPLE__
1168 const char* os::get_temp_directory() { return "/tmp"; }
1169 #endif // __APPLE__
1170
1171 // check if addr is inside libjvm.so
1172 bool os::address_is_in_vm(address addr) {
1173 static address libjvm_base_addr;
1174 Dl_info dlinfo;
1175
1176 if (libjvm_base_addr == NULL) {
1177 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1178 libjvm_base_addr = (address)dlinfo.dli_fbase;
1179 }
1180 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1181 }
1182
1183 if (dladdr((void *)addr, &dlinfo) != 0) {
1184 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1185 }
1186
1187 return false;
1188 }
1189
1190
1191 #define MACH_MAXSYMLEN 256
1192
1193 bool os::dll_address_to_function_name(address addr, char *buf,
1194 int buflen, int *offset,
1195 bool demangle) {
1196 // buf is not optional, but offset is optional
1197 assert(buf != NULL, "sanity check");
1198
1199 Dl_info dlinfo;
1200 char localbuf[MACH_MAXSYMLEN];
1201
1202 if (dladdr((void*)addr, &dlinfo) != 0) {
1203 // see if we have a matching symbol
1204 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1205 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1206 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1207 }
1208 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1209 return true;
1210 }
1211 // no matching symbol so try for just file info
1212 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1213 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1214 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1215 return true;
1216 }
1217 }
1218
1219 // Handle non-dynamic manually:
1220 if (dlinfo.dli_fbase != NULL &&
1221 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1222 dlinfo.dli_fbase)) {
1223 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1224 jio_snprintf(buf, buflen, "%s", localbuf);
1225 }
1226 return true;
1227 }
1228 }
1229 buf[0] = '\0';
1230 if (offset != NULL) *offset = -1;
1231 return false;
1232 }
1233
1234 // ported from solaris version
1235 bool os::dll_address_to_library_name(address addr, char* buf,
1236 int buflen, int* offset) {
1237 // buf is not optional, but offset is optional
1238 assert(buf != NULL, "sanity check");
1239
1240 Dl_info dlinfo;
1241
1242 if (dladdr((void*)addr, &dlinfo) != 0) {
1243 if (dlinfo.dli_fname != NULL) {
1244 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1245 }
1246 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1247 *offset = addr - (address)dlinfo.dli_fbase;
1248 }
1249 return true;
1250 }
1251
1252 buf[0] = '\0';
1253 if (offset) *offset = -1;
1254 return false;
1255 }
1256
1257 // Loads .dll/.so and
1258 // in case of error it checks if .dll/.so was built for the
1259 // same architecture as Hotspot is running on
1260
1261 #ifdef __APPLE__
1262 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1263 #ifdef STATIC_BUILD
1264 return os::get_default_process_handle();
1265 #else
1266 log_info(os)("attempting shared library load of %s", filename);
1267
1268 void * result= ::dlopen(filename, RTLD_LAZY);
1269 if (result != NULL) {
1270 Events::log(NULL, "Loaded shared library %s", filename);
1271 // Successful loading
1272 log_info(os)("shared library load of %s was successful", filename);
1273 return result;
1274 }
1275
1276 const char* error_report = ::dlerror();
1277 if (error_report == NULL) {
1278 error_report = "dlerror returned no error description";
1279 }
1280 if (ebuf != NULL && ebuflen > 0) {
1281 // Read system error message into ebuf
1282 ::strncpy(ebuf, error_report, ebuflen-1);
1283 ebuf[ebuflen-1]='\0';
1284 }
1285 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1286 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1287
1288 return NULL;
1289 #endif // STATIC_BUILD
1290 }
1291 #else
1292 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1293 #ifdef STATIC_BUILD
1294 return os::get_default_process_handle();
1295 #else
1296 log_info(os)("attempting shared library load of %s", filename);
1297 void * result= ::dlopen(filename, RTLD_LAZY);
1298 if (result != NULL) {
1299 Events::log(NULL, "Loaded shared library %s", filename);
1300 // Successful loading
1301 log_info(os)("shared library load of %s was successful", filename);
1302 return result;
1303 }
1304
1305 Elf32_Ehdr elf_head;
1306
1307 const char* const error_report = ::dlerror();
1308 if (error_report == NULL) {
1309 error_report = "dlerror returned no error description";
1310 }
1311 if (ebuf != NULL && ebuflen > 0) {
1312 // Read system error message into ebuf
1313 ::strncpy(ebuf, error_report, ebuflen-1);
1314 ebuf[ebuflen-1]='\0';
1315 }
1316 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1317 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1318
1319 int diag_msg_max_length=ebuflen-strlen(ebuf);
1320 char* diag_msg_buf=ebuf+strlen(ebuf);
1321
1322 if (diag_msg_max_length==0) {
1323 // No more space in ebuf for additional diagnostics message
1324 return NULL;
1325 }
1326
1327
1328 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1329
1330 if (file_descriptor < 0) {
1331 // Can't open library, report dlerror() message
1332 return NULL;
1333 }
1334
1335 bool failed_to_read_elf_head=
1336 (sizeof(elf_head)!=
1337 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1338
1339 ::close(file_descriptor);
1340 if (failed_to_read_elf_head) {
1341 // file i/o error - report dlerror() msg
1342 return NULL;
1343 }
1344
1345 typedef struct {
1346 Elf32_Half code; // Actual value as defined in elf.h
1347 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1348 char elf_class; // 32 or 64 bit
1349 char endianess; // MSB or LSB
1350 char* name; // String representation
1351 } arch_t;
1352
1353 #ifndef EM_486
1354 #define EM_486 6 /* Intel 80486 */
1355 #endif
1356
1357 #ifndef EM_MIPS_RS3_LE
1358 #define EM_MIPS_RS3_LE 10 /* MIPS */
1359 #endif
1360
1361 #ifndef EM_PPC64
1362 #define EM_PPC64 21 /* PowerPC64 */
1363 #endif
1364
1365 #ifndef EM_S390
1366 #define EM_S390 22 /* IBM System/390 */
1367 #endif
1368
1369 #ifndef EM_IA_64
1370 #define EM_IA_64 50 /* HP/Intel IA-64 */
1371 #endif
1372
1373 #ifndef EM_X86_64
1374 #define EM_X86_64 62 /* AMD x86-64 */
1375 #endif
1376
1377 static const arch_t arch_array[]={
1378 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1379 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1380 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1381 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1382 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1383 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1384 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1385 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1386 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1387 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1388 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1389 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1390 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1391 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1392 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1393 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1394 };
1395
1396 #if (defined IA32)
1397 static Elf32_Half running_arch_code=EM_386;
1398 #elif (defined AMD64)
1399 static Elf32_Half running_arch_code=EM_X86_64;
1400 #elif (defined IA64)
1401 static Elf32_Half running_arch_code=EM_IA_64;
1402 #elif (defined __sparc) && (defined _LP64)
1403 static Elf32_Half running_arch_code=EM_SPARCV9;
1404 #elif (defined __sparc) && (!defined _LP64)
1405 static Elf32_Half running_arch_code=EM_SPARC;
1406 #elif (defined __powerpc64__)
1407 static Elf32_Half running_arch_code=EM_PPC64;
1408 #elif (defined __powerpc__)
1409 static Elf32_Half running_arch_code=EM_PPC;
1410 #elif (defined ARM)
1411 static Elf32_Half running_arch_code=EM_ARM;
1412 #elif (defined S390)
1413 static Elf32_Half running_arch_code=EM_S390;
1414 #elif (defined ALPHA)
1415 static Elf32_Half running_arch_code=EM_ALPHA;
1416 #elif (defined MIPSEL)
1417 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1418 #elif (defined PARISC)
1419 static Elf32_Half running_arch_code=EM_PARISC;
1420 #elif (defined MIPS)
1421 static Elf32_Half running_arch_code=EM_MIPS;
1422 #elif (defined M68K)
1423 static Elf32_Half running_arch_code=EM_68K;
1424 #else
1425 #error Method os::dll_load requires that one of following is defined:\
1426 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1427 #endif
1428
1429 // Identify compatability class for VM's architecture and library's architecture
1430 // Obtain string descriptions for architectures
1431
1432 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1433 int running_arch_index=-1;
1434
1435 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1436 if (running_arch_code == arch_array[i].code) {
1437 running_arch_index = i;
1438 }
1439 if (lib_arch.code == arch_array[i].code) {
1440 lib_arch.compat_class = arch_array[i].compat_class;
1441 lib_arch.name = arch_array[i].name;
1442 }
1443 }
1444
1445 assert(running_arch_index != -1,
1446 "Didn't find running architecture code (running_arch_code) in arch_array");
1447 if (running_arch_index == -1) {
1448 // Even though running architecture detection failed
1449 // we may still continue with reporting dlerror() message
1450 return NULL;
1451 }
1452
1453 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1454 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1455 return NULL;
1456 }
1457
1458 #ifndef S390
1459 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1460 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1461 return NULL;
1462 }
1463 #endif // !S390
1464
1465 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1466 if (lib_arch.name!=NULL) {
1467 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1468 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1469 lib_arch.name, arch_array[running_arch_index].name);
1470 } else {
1471 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1472 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1473 lib_arch.code,
1474 arch_array[running_arch_index].name);
1475 }
1476 }
1477
1478 return NULL;
1479 #endif // STATIC_BUILD
1480 }
1481 #endif // !__APPLE__
1482
1483 void* os::get_default_process_handle() {
1484 #ifdef __APPLE__
1485 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1486 // to avoid finding unexpected symbols on second (or later)
1487 // loads of a library.
1488 return (void*)::dlopen(NULL, RTLD_FIRST);
1489 #else
1490 return (void*)::dlopen(NULL, RTLD_LAZY);
1491 #endif
1492 }
1493
1494 // XXX: Do we need a lock around this as per Linux?
1495 void* os::dll_lookup(void* handle, const char* name) {
1496 return dlsym(handle, name);
1497 }
1498
1499 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1500 outputStream * out = (outputStream *) param;
1501 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1502 return 0;
1503 }
1504
1505 void os::print_dll_info(outputStream *st) {
1506 st->print_cr("Dynamic libraries:");
1507 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1508 st->print_cr("Error: Cannot print dynamic libraries.");
1509 }
1510 }
1511
1512 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1513 #ifdef RTLD_DI_LINKMAP
1514 Dl_info dli;
1515 void *handle;
1516 Link_map *map;
1517 Link_map *p;
1518
1519 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1520 dli.dli_fname == NULL) {
1521 return 1;
1522 }
1523 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1524 if (handle == NULL) {
1525 return 1;
1526 }
1527 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1528 if (map == NULL) {
1529 dlclose(handle);
1530 return 1;
1531 }
1532
1533 while (map->l_prev != NULL)
1534 map = map->l_prev;
1535
1536 while (map != NULL) {
1537 // Value for top_address is returned as 0 since we don't have any information about module size
1538 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1539 dlclose(handle);
1540 return 1;
1541 }
1542 map = map->l_next;
1543 }
1544
1545 dlclose(handle);
1546 #elif defined(__APPLE__)
1547 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1548 // Value for top_address is returned as 0 since we don't have any information about module size
1549 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1550 return 1;
1551 }
1552 }
1553 return 0;
1554 #else
1555 return 1;
1556 #endif
1557 }
1558
1559 void os::get_summary_os_info(char* buf, size_t buflen) {
1560 // These buffers are small because we want this to be brief
1561 // and not use a lot of stack while generating the hs_err file.
1562 char os[100];
1563 size_t size = sizeof(os);
1564 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1565 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1566 #ifdef __APPLE__
1567 strncpy(os, "Darwin", sizeof(os));
1568 #elif __OpenBSD__
1569 strncpy(os, "OpenBSD", sizeof(os));
1570 #else
1571 strncpy(os, "BSD", sizeof(os));
1572 #endif
1573 }
1574
1575 char release[100];
1576 size = sizeof(release);
1577 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1578 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1579 // if error, leave blank
1580 strncpy(release, "", sizeof(release));
1581 }
1582 snprintf(buf, buflen, "%s %s", os, release);
1583 }
1584
1585 void os::print_os_info_brief(outputStream* st) {
1586 os::Posix::print_uname_info(st);
1587 }
1588
1589 void os::print_os_info(outputStream* st) {
1590 st->print("OS:");
1591
1592 os::Posix::print_uname_info(st);
1593
1594 os::Posix::print_rlimit_info(st);
1595
1596 os::Posix::print_load_average(st);
1597 }
1598
1599 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1600 // Nothing to do for now.
1601 }
1602
1603 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1604 unsigned int mhz;
1605 size_t size = sizeof(mhz);
1606 int mib[] = { CTL_HW, HW_CPU_FREQ };
1607 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1608 mhz = 1; // looks like an error but can be divided by
1609 } else {
1610 mhz /= 1000000; // reported in millions
1611 }
1612
1613 char model[100];
1614 size = sizeof(model);
1615 int mib_model[] = { CTL_HW, HW_MODEL };
1616 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1617 strncpy(model, cpu_arch, sizeof(model));
1618 }
1619
1620 char machine[100];
1621 size = sizeof(machine);
1622 int mib_machine[] = { CTL_HW, HW_MACHINE };
1623 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1624 strncpy(machine, "", sizeof(machine));
1625 }
1626
1627 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1628 }
1629
1630 void os::print_memory_info(outputStream* st) {
1631 xsw_usage swap_usage;
1632 size_t size = sizeof(swap_usage);
1633
1634 st->print("Memory:");
1635 st->print(" %dk page", os::vm_page_size()>>10);
1636
1637 st->print(", physical " UINT64_FORMAT "k",
1638 os::physical_memory() >> 10);
1639 st->print("(" UINT64_FORMAT "k free)",
1640 os::available_memory() >> 10);
1641
1642 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1643 if (size >= offset_of(xsw_usage, xsu_used)) {
1644 st->print(", swap " UINT64_FORMAT "k",
1645 ((julong) swap_usage.xsu_total) >> 10);
1646 st->print("(" UINT64_FORMAT "k free)",
1647 ((julong) swap_usage.xsu_avail) >> 10);
1648 }
1649 }
1650
1651 st->cr();
1652 }
1653
1654 static void print_signal_handler(outputStream* st, int sig,
1655 char* buf, size_t buflen);
1656
1657 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1658 st->print_cr("Signal Handlers:");
1659 print_signal_handler(st, SIGSEGV, buf, buflen);
1660 print_signal_handler(st, SIGBUS , buf, buflen);
1661 print_signal_handler(st, SIGFPE , buf, buflen);
1662 print_signal_handler(st, SIGPIPE, buf, buflen);
1663 print_signal_handler(st, SIGXFSZ, buf, buflen);
1664 print_signal_handler(st, SIGILL , buf, buflen);
1665 print_signal_handler(st, SR_signum, buf, buflen);
1666 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1667 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1668 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1669 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1670 }
1671
1672 static char saved_jvm_path[MAXPATHLEN] = {0};
1673
1674 // Find the full path to the current module, libjvm
1675 void os::jvm_path(char *buf, jint buflen) {
1676 // Error checking.
1677 if (buflen < MAXPATHLEN) {
1678 assert(false, "must use a large-enough buffer");
1679 buf[0] = '\0';
1680 return;
1681 }
1682 // Lazy resolve the path to current module.
1683 if (saved_jvm_path[0] != 0) {
1684 strcpy(buf, saved_jvm_path);
1685 return;
1686 }
1687
1688 char dli_fname[MAXPATHLEN];
1689 bool ret = dll_address_to_library_name(
1690 CAST_FROM_FN_PTR(address, os::jvm_path),
1691 dli_fname, sizeof(dli_fname), NULL);
1692 assert(ret, "cannot locate libjvm");
1693 char *rp = NULL;
1694 if (ret && dli_fname[0] != '\0') {
1695 rp = os::Posix::realpath(dli_fname, buf, buflen);
1696 }
1697 if (rp == NULL) {
1698 return;
1699 }
1700
1701 if (Arguments::sun_java_launcher_is_altjvm()) {
1702 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1703 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1704 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1705 // appears at the right place in the string, then assume we are
1706 // installed in a JDK and we're done. Otherwise, check for a
1707 // JAVA_HOME environment variable and construct a path to the JVM
1708 // being overridden.
1709
1710 const char *p = buf + strlen(buf) - 1;
1711 for (int count = 0; p > buf && count < 5; ++count) {
1712 for (--p; p > buf && *p != '/'; --p)
1713 /* empty */ ;
1714 }
1715
1716 if (strncmp(p, "/jre/lib/", 9) != 0) {
1717 // Look for JAVA_HOME in the environment.
1718 char* java_home_var = ::getenv("JAVA_HOME");
1719 if (java_home_var != NULL && java_home_var[0] != 0) {
1720 char* jrelib_p;
1721 int len;
1722
1723 // Check the current module name "libjvm"
1724 p = strrchr(buf, '/');
1725 assert(strstr(p, "/libjvm") == p, "invalid library name");
1726
1727 rp = os::Posix::realpath(java_home_var, buf, buflen);
1728 if (rp == NULL) {
1729 return;
1730 }
1731
1732 // determine if this is a legacy image or modules image
1733 // modules image doesn't have "jre" subdirectory
1734 len = strlen(buf);
1735 assert(len < buflen, "Ran out of buffer space");
1736 jrelib_p = buf + len;
1737
1738 // Add the appropriate library subdir
1739 snprintf(jrelib_p, buflen-len, "/jre/lib");
1740 if (0 != access(buf, F_OK)) {
1741 snprintf(jrelib_p, buflen-len, "/lib");
1742 }
1743
1744 // Add the appropriate client or server subdir
1745 len = strlen(buf);
1746 jrelib_p = buf + len;
1747 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1748 if (0 != access(buf, F_OK)) {
1749 snprintf(jrelib_p, buflen-len, "%s", "");
1750 }
1751
1752 // If the path exists within JAVA_HOME, add the JVM library name
1753 // to complete the path to JVM being overridden. Otherwise fallback
1754 // to the path to the current library.
1755 if (0 == access(buf, F_OK)) {
1756 // Use current module name "libjvm"
1757 len = strlen(buf);
1758 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1759 } else {
1760 // Fall back to path of current library
1761 rp = os::Posix::realpath(dli_fname, buf, buflen);
1762 if (rp == NULL) {
1763 return;
1764 }
1765 }
1766 }
1767 }
1768 }
1769
1770 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1771 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1772 }
1773
1774 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1775 // no prefix required, not even "_"
1776 }
1777
1778 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1779 // no suffix required
1780 }
1781
1782 ////////////////////////////////////////////////////////////////////////////////
1783 // sun.misc.Signal support
1784
1785 static void UserHandler(int sig, void *siginfo, void *context) {
1786 // Ctrl-C is pressed during error reporting, likely because the error
1787 // handler fails to abort. Let VM die immediately.
1788 if (sig == SIGINT && VMError::is_error_reported()) {
1789 os::die();
1790 }
1791
1792 os::signal_notify(sig);
1793 }
1794
1795 void* os::user_handler() {
1796 return CAST_FROM_FN_PTR(void*, UserHandler);
1797 }
1798
1799 extern "C" {
1800 typedef void (*sa_handler_t)(int);
1801 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1802 }
1803
1804 void* os::signal(int signal_number, void* handler) {
1805 struct sigaction sigAct, oldSigAct;
1806
1807 sigfillset(&(sigAct.sa_mask));
1808 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1809 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1810
1811 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1812 // -1 means registration failed
1813 return (void *)-1;
1814 }
1815
1816 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1817 }
1818
1819 void os::signal_raise(int signal_number) {
1820 ::raise(signal_number);
1821 }
1822
1823 // The following code is moved from os.cpp for making this
1824 // code platform specific, which it is by its very nature.
1825
1826 // Will be modified when max signal is changed to be dynamic
1827 int os::sigexitnum_pd() {
1828 return NSIG;
1829 }
1830
1831 // a counter for each possible signal value
1832 static volatile jint pending_signals[NSIG+1] = { 0 };
1833 static Semaphore* sig_sem = NULL;
1834
1835 static void jdk_misc_signal_init() {
1836 // Initialize signal structures
1837 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1838
1839 // Initialize signal semaphore
1840 sig_sem = new Semaphore();
1841 }
1842
1843 void os::signal_notify(int sig) {
1844 if (sig_sem != NULL) {
1845 Atomic::inc(&pending_signals[sig]);
1846 sig_sem->signal();
1847 } else {
1848 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1849 // initialization isn't called.
1850 assert(ReduceSignalUsage, "signal semaphore should be created");
1851 }
1852 }
1853
1854 static int check_pending_signals() {
1855 for (;;) {
1856 for (int i = 0; i < NSIG + 1; i++) {
1857 jint n = pending_signals[i];
1858 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1859 return i;
1860 }
1861 }
1862 JavaThread *thread = JavaThread::current();
1863 ThreadBlockInVM tbivm(thread);
1864
1865 bool threadIsSuspended;
1866 do {
1867 thread->set_suspend_equivalent();
1868 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1869 sig_sem->wait();
1870
1871 // were we externally suspended while we were waiting?
1872 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1873 if (threadIsSuspended) {
1874 // The semaphore has been incremented, but while we were waiting
1875 // another thread suspended us. We don't want to continue running
1876 // while suspended because that would surprise the thread that
1877 // suspended us.
1878 sig_sem->signal();
1879
1880 thread->java_suspend_self();
1881 }
1882 } while (threadIsSuspended);
1883 }
1884 }
1885
1886 int os::signal_wait() {
1887 return check_pending_signals();
1888 }
1889
1890 ////////////////////////////////////////////////////////////////////////////////
1891 // Virtual Memory
1892
1893 int os::vm_page_size() {
1894 // Seems redundant as all get out
1895 assert(os::Bsd::page_size() != -1, "must call os::init");
1896 return os::Bsd::page_size();
1897 }
1898
1899 // Solaris allocates memory by pages.
1900 int os::vm_allocation_granularity() {
1901 assert(os::Bsd::page_size() != -1, "must call os::init");
1902 return os::Bsd::page_size();
1903 }
1904
1905 // Rationale behind this function:
1906 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1907 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1908 // samples for JITted code. Here we create private executable mapping over the code cache
1909 // and then we can use standard (well, almost, as mapping can change) way to provide
1910 // info for the reporting script by storing timestamp and location of symbol
1911 void bsd_wrap_code(char* base, size_t size) {
1912 static volatile jint cnt = 0;
1913
1914 if (!UseOprofile) {
1915 return;
1916 }
1917
1918 char buf[PATH_MAX + 1];
1919 int num = Atomic::add(1, &cnt);
1920
1921 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1922 os::get_temp_directory(), os::current_process_id(), num);
1923 unlink(buf);
1924
1925 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1926
1927 if (fd != -1) {
1928 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1929 if (rv != (off_t)-1) {
1930 if (::write(fd, "", 1) == 1) {
1931 mmap(base, size,
1932 PROT_READ|PROT_WRITE|PROT_EXEC,
1933 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1934 }
1935 }
1936 ::close(fd);
1937 unlink(buf);
1938 }
1939 }
1940
1941 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1942 int err) {
1943 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1944 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1945 os::errno_name(err), err);
1946 }
1947
1948 // NOTE: Bsd kernel does not really reserve the pages for us.
1949 // All it does is to check if there are enough free pages
1950 // left at the time of mmap(). This could be a potential
1951 // problem.
1952 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1953 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1954 #ifdef __OpenBSD__
1955 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1956 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1957 if (::mprotect(addr, size, prot) == 0) {
1958 return true;
1959 }
1960 #else
1961 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1962 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1963 if (res != (uintptr_t) MAP_FAILED) {
1964 return true;
1965 }
1966 #endif
1967
1968 // Warn about any commit errors we see in non-product builds just
1969 // in case mmap() doesn't work as described on the man page.
1970 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1971
1972 return false;
1973 }
1974
1975 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1976 bool exec) {
1977 // alignment_hint is ignored on this OS
1978 return pd_commit_memory(addr, size, exec);
1979 }
1980
1981 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1982 const char* mesg) {
1983 assert(mesg != NULL, "mesg must be specified");
1984 if (!pd_commit_memory(addr, size, exec)) {
1985 // add extra info in product mode for vm_exit_out_of_memory():
1986 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1987 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1988 }
1989 }
1990
1991 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1992 size_t alignment_hint, bool exec,
1993 const char* mesg) {
1994 // alignment_hint is ignored on this OS
1995 pd_commit_memory_or_exit(addr, size, exec, mesg);
1996 }
1997
1998 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1999 }
2000
2001 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2002 ::madvise(addr, bytes, MADV_DONTNEED);
2003 }
2004
2005 void os::numa_make_global(char *addr, size_t bytes) {
2006 }
2007
2008 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2009 }
2010
2011 bool os::numa_topology_changed() { return false; }
2012
2013 size_t os::numa_get_groups_num() {
2014 return 1;
2015 }
2016
2017 int os::numa_get_group_id() {
2018 return 0;
2019 }
2020
2021 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2022 if (size > 0) {
2023 ids[0] = 0;
2024 return 1;
2025 }
2026 return 0;
2027 }
2028
2029 int os::numa_get_address_id(uintptr_t addr) {
2030 return 0;
2031 }
2032
2033 bool os::get_page_info(char *start, page_info* info) {
2034 return false;
2035 }
2036
2037 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2038 return end;
2039 }
2040
2041
2042 bool os::pd_uncommit_memory(char* addr, size_t size) {
2043 #ifdef __OpenBSD__
2044 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2045 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2046 return ::mprotect(addr, size, PROT_NONE) == 0;
2047 #else
2048 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2049 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2050 return res != (uintptr_t) MAP_FAILED;
2051 #endif
2052 }
2053
2054 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2055 return os::commit_memory(addr, size, !ExecMem);
2056 }
2057
2058 // If this is a growable mapping, remove the guard pages entirely by
2059 // munmap()ping them. If not, just call uncommit_memory().
2060 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2061 return os::uncommit_memory(addr, size);
2062 }
2063
2064 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2065 // at 'requested_addr'. If there are existing memory mappings at the same
2066 // location, however, they will be overwritten. If 'fixed' is false,
2067 // 'requested_addr' is only treated as a hint, the return value may or
2068 // may not start from the requested address. Unlike Bsd mmap(), this
2069 // function returns NULL to indicate failure.
2070 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2071 char * addr;
2072 int flags;
2073
2074 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2075 if (fixed) {
2076 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2077 flags |= MAP_FIXED;
2078 }
2079
2080 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2081 // touch an uncommitted page. Otherwise, the read/write might
2082 // succeed if we have enough swap space to back the physical page.
2083 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2084 flags, -1, 0);
2085
2086 return addr == MAP_FAILED ? NULL : addr;
2087 }
2088
2089 static int anon_munmap(char * addr, size_t size) {
2090 return ::munmap(addr, size) == 0;
2091 }
2092
2093 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2094 size_t alignment_hint) {
2095 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2096 }
2097
2098 bool os::pd_release_memory(char* addr, size_t size) {
2099 return anon_munmap(addr, size);
2100 }
2101
2102 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2103 // Bsd wants the mprotect address argument to be page aligned.
2104 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2105
2106 // According to SUSv3, mprotect() should only be used with mappings
2107 // established by mmap(), and mmap() always maps whole pages. Unaligned
2108 // 'addr' likely indicates problem in the VM (e.g. trying to change
2109 // protection of malloc'ed or statically allocated memory). Check the
2110 // caller if you hit this assert.
2111 assert(addr == bottom, "sanity check");
2112
2113 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2114 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2115 return ::mprotect(bottom, size, prot) == 0;
2116 }
2117
2118 // Set protections specified
2119 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2120 bool is_committed) {
2121 unsigned int p = 0;
2122 switch (prot) {
2123 case MEM_PROT_NONE: p = PROT_NONE; break;
2124 case MEM_PROT_READ: p = PROT_READ; break;
2125 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2126 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2127 default:
2128 ShouldNotReachHere();
2129 }
2130 // is_committed is unused.
2131 return bsd_mprotect(addr, bytes, p);
2132 }
2133
2134 bool os::guard_memory(char* addr, size_t size) {
2135 return bsd_mprotect(addr, size, PROT_NONE);
2136 }
2137
2138 bool os::unguard_memory(char* addr, size_t size) {
2139 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2140 }
2141
2142 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2143 return false;
2144 }
2145
2146 // Large page support
2147
2148 static size_t _large_page_size = 0;
2149
2150 void os::large_page_init() {
2151 }
2152
2153
2154 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2155 fatal("os::reserve_memory_special should not be called on BSD.");
2156 return NULL;
2157 }
2158
2159 bool os::release_memory_special(char* base, size_t bytes) {
2160 fatal("os::release_memory_special should not be called on BSD.");
2161 return false;
2162 }
2163
2164 size_t os::large_page_size() {
2165 return _large_page_size;
2166 }
2167
2168 bool os::can_commit_large_page_memory() {
2169 // Does not matter, we do not support huge pages.
2170 return false;
2171 }
2172
2173 bool os::can_execute_large_page_memory() {
2174 // Does not matter, we do not support huge pages.
2175 return false;
2176 }
2177
2178 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2179 assert(file_desc >= 0, "file_desc is not valid");
2180 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2181 if (result != NULL) {
2182 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2183 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2184 }
2185 }
2186 return result;
2187 }
2188
2189 // Reserve memory at an arbitrary address, only if that area is
2190 // available (and not reserved for something else).
2191
2192 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2193 // Assert only that the size is a multiple of the page size, since
2194 // that's all that mmap requires, and since that's all we really know
2195 // about at this low abstraction level. If we need higher alignment,
2196 // we can either pass an alignment to this method or verify alignment
2197 // in one of the methods further up the call chain. See bug 5044738.
2198 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2199
2200 // Repeatedly allocate blocks until the block is allocated at the
2201 // right spot.
2202
2203 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2204 // if kernel honors the hint then we can return immediately.
2205 char * addr = anon_mmap(requested_addr, bytes, false);
2206 if (addr == requested_addr) {
2207 return requested_addr;
2208 }
2209
2210 if (addr != NULL) {
2211 // mmap() is successful but it fails to reserve at the requested address
2212 anon_munmap(addr, bytes);
2213 }
2214
2215 return NULL;
2216 }
2217
2218 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2219 void os::infinite_sleep() {
2220 while (true) { // sleep forever ...
2221 ::sleep(100); // ... 100 seconds at a time
2222 }
2223 }
2224
2225 // Used to convert frequent JVM_Yield() to nops
2226 bool os::dont_yield() {
2227 return DontYieldALot;
2228 }
2229
2230 void os::naked_yield() {
2231 sched_yield();
2232 }
2233
2234 ////////////////////////////////////////////////////////////////////////////////
2235 // thread priority support
2236
2237 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2238 // only supports dynamic priority, static priority must be zero. For real-time
2239 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2240 // However, for large multi-threaded applications, SCHED_RR is not only slower
2241 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2242 // of 5 runs - Sep 2005).
2243 //
2244 // The following code actually changes the niceness of kernel-thread/LWP. It
2245 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2246 // not the entire user process, and user level threads are 1:1 mapped to kernel
2247 // threads. It has always been the case, but could change in the future. For
2248 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2249 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2250 // (e.g., root privilege or CAP_SYS_NICE capability).
2251
2252 #if !defined(__APPLE__)
2253 int os::java_to_os_priority[CriticalPriority + 1] = {
2254 19, // 0 Entry should never be used
2255
2256 0, // 1 MinPriority
2257 3, // 2
2258 6, // 3
2259
2260 10, // 4
2261 15, // 5 NormPriority
2262 18, // 6
2263
2264 21, // 7
2265 25, // 8
2266 28, // 9 NearMaxPriority
2267
2268 31, // 10 MaxPriority
2269
2270 31 // 11 CriticalPriority
2271 };
2272 #else
2273 // Using Mach high-level priority assignments
2274 int os::java_to_os_priority[CriticalPriority + 1] = {
2275 0, // 0 Entry should never be used (MINPRI_USER)
2276
2277 27, // 1 MinPriority
2278 28, // 2
2279 29, // 3
2280
2281 30, // 4
2282 31, // 5 NormPriority (BASEPRI_DEFAULT)
2283 32, // 6
2284
2285 33, // 7
2286 34, // 8
2287 35, // 9 NearMaxPriority
2288
2289 36, // 10 MaxPriority
2290
2291 36 // 11 CriticalPriority
2292 };
2293 #endif
2294
2295 static int prio_init() {
2296 if (ThreadPriorityPolicy == 1) {
2297 if (geteuid() != 0) {
2298 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2299 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2300 "e.g., being the root user. If the necessary permission is not " \
2301 "possessed, changes to priority will be silently ignored.");
2302 }
2303 }
2304 }
2305 if (UseCriticalJavaThreadPriority) {
2306 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2307 }
2308 return 0;
2309 }
2310
2311 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2312 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2313
2314 #ifdef __OpenBSD__
2315 // OpenBSD pthread_setprio starves low priority threads
2316 return OS_OK;
2317 #elif defined(__FreeBSD__)
2318 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2319 return (ret == 0) ? OS_OK : OS_ERR;
2320 #elif defined(__APPLE__) || defined(__NetBSD__)
2321 struct sched_param sp;
2322 int policy;
2323
2324 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2325 return OS_ERR;
2326 }
2327
2328 sp.sched_priority = newpri;
2329 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2330 return OS_ERR;
2331 }
2332
2333 return OS_OK;
2334 #else
2335 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2336 return (ret == 0) ? OS_OK : OS_ERR;
2337 #endif
2338 }
2339
2340 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2341 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2342 *priority_ptr = java_to_os_priority[NormPriority];
2343 return OS_OK;
2344 }
2345
2346 errno = 0;
2347 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2348 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2349 #elif defined(__APPLE__) || defined(__NetBSD__)
2350 int policy;
2351 struct sched_param sp;
2352
2353 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2354 if (res != 0) {
2355 *priority_ptr = -1;
2356 return OS_ERR;
2357 } else {
2358 *priority_ptr = sp.sched_priority;
2359 return OS_OK;
2360 }
2361 #else
2362 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2363 #endif
2364 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2365 }
2366
2367 ////////////////////////////////////////////////////////////////////////////////
2368 // suspend/resume support
2369
2370 // The low-level signal-based suspend/resume support is a remnant from the
2371 // old VM-suspension that used to be for java-suspension, safepoints etc,
2372 // within hotspot. Currently used by JFR's OSThreadSampler
2373 //
2374 // The remaining code is greatly simplified from the more general suspension
2375 // code that used to be used.
2376 //
2377 // The protocol is quite simple:
2378 // - suspend:
2379 // - sends a signal to the target thread
2380 // - polls the suspend state of the osthread using a yield loop
2381 // - target thread signal handler (SR_handler) sets suspend state
2382 // and blocks in sigsuspend until continued
2383 // - resume:
2384 // - sets target osthread state to continue
2385 // - sends signal to end the sigsuspend loop in the SR_handler
2386 //
2387 // Note that the SR_lock plays no role in this suspend/resume protocol,
2388 // but is checked for NULL in SR_handler as a thread termination indicator.
2389 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2390 //
2391 // Note that resume_clear_context() and suspend_save_context() are needed
2392 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2393 // which in part is used by:
2394 // - Forte Analyzer: AsyncGetCallTrace()
2395 // - StackBanging: get_frame_at_stack_banging_point()
2396
2397 static void resume_clear_context(OSThread *osthread) {
2398 osthread->set_ucontext(NULL);
2399 osthread->set_siginfo(NULL);
2400 }
2401
2402 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2403 osthread->set_ucontext(context);
2404 osthread->set_siginfo(siginfo);
2405 }
2406
2407 // Handler function invoked when a thread's execution is suspended or
2408 // resumed. We have to be careful that only async-safe functions are
2409 // called here (Note: most pthread functions are not async safe and
2410 // should be avoided.)
2411 //
2412 // Note: sigwait() is a more natural fit than sigsuspend() from an
2413 // interface point of view, but sigwait() prevents the signal hander
2414 // from being run. libpthread would get very confused by not having
2415 // its signal handlers run and prevents sigwait()'s use with the
2416 // mutex granting granting signal.
2417 //
2418 // Currently only ever called on the VMThread or JavaThread
2419 //
2420 #ifdef __APPLE__
2421 static OSXSemaphore sr_semaphore;
2422 #else
2423 static PosixSemaphore sr_semaphore;
2424 #endif
2425
2426 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2427 // Save and restore errno to avoid confusing native code with EINTR
2428 // after sigsuspend.
2429 int old_errno = errno;
2430
2431 Thread* thread = Thread::current_or_null_safe();
2432 assert(thread != NULL, "Missing current thread in SR_handler");
2433
2434 // On some systems we have seen signal delivery get "stuck" until the signal
2435 // mask is changed as part of thread termination. Check that the current thread
2436 // has not already terminated (via SR_lock()) - else the following assertion
2437 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2438 // destructor has completed.
2439
2440 if (thread->SR_lock() == NULL) {
2441 return;
2442 }
2443
2444 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2445
2446 OSThread* osthread = thread->osthread();
2447
2448 os::SuspendResume::State current = osthread->sr.state();
2449 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2450 suspend_save_context(osthread, siginfo, context);
2451
2452 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2453 os::SuspendResume::State state = osthread->sr.suspended();
2454 if (state == os::SuspendResume::SR_SUSPENDED) {
2455 sigset_t suspend_set; // signals for sigsuspend()
2456
2457 // get current set of blocked signals and unblock resume signal
2458 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2459 sigdelset(&suspend_set, SR_signum);
2460
2461 sr_semaphore.signal();
2462 // wait here until we are resumed
2463 while (1) {
2464 sigsuspend(&suspend_set);
2465
2466 os::SuspendResume::State result = osthread->sr.running();
2467 if (result == os::SuspendResume::SR_RUNNING) {
2468 sr_semaphore.signal();
2469 break;
2470 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2471 ShouldNotReachHere();
2472 }
2473 }
2474
2475 } else if (state == os::SuspendResume::SR_RUNNING) {
2476 // request was cancelled, continue
2477 } else {
2478 ShouldNotReachHere();
2479 }
2480
2481 resume_clear_context(osthread);
2482 } else if (current == os::SuspendResume::SR_RUNNING) {
2483 // request was cancelled, continue
2484 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2485 // ignore
2486 } else {
2487 // ignore
2488 }
2489
2490 errno = old_errno;
2491 }
2492
2493
2494 static int SR_initialize() {
2495 struct sigaction act;
2496 char *s;
2497 // Get signal number to use for suspend/resume
2498 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2499 int sig = ::strtol(s, 0, 10);
2500 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2501 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2502 SR_signum = sig;
2503 } else {
2504 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2505 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2506 }
2507 }
2508
2509 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2510 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2511
2512 sigemptyset(&SR_sigset);
2513 sigaddset(&SR_sigset, SR_signum);
2514
2515 // Set up signal handler for suspend/resume
2516 act.sa_flags = SA_RESTART|SA_SIGINFO;
2517 act.sa_handler = (void (*)(int)) SR_handler;
2518
2519 // SR_signum is blocked by default.
2520 // 4528190 - We also need to block pthread restart signal (32 on all
2521 // supported Bsd platforms). Note that BsdThreads need to block
2522 // this signal for all threads to work properly. So we don't have
2523 // to use hard-coded signal number when setting up the mask.
2524 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2525
2526 if (sigaction(SR_signum, &act, 0) == -1) {
2527 return -1;
2528 }
2529
2530 // Save signal flag
2531 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2532 return 0;
2533 }
2534
2535 static int sr_notify(OSThread* osthread) {
2536 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2537 assert_status(status == 0, status, "pthread_kill");
2538 return status;
2539 }
2540
2541 // "Randomly" selected value for how long we want to spin
2542 // before bailing out on suspending a thread, also how often
2543 // we send a signal to a thread we want to resume
2544 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2545 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2546
2547 // returns true on success and false on error - really an error is fatal
2548 // but this seems the normal response to library errors
2549 static bool do_suspend(OSThread* osthread) {
2550 assert(osthread->sr.is_running(), "thread should be running");
2551 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2552
2553 // mark as suspended and send signal
2554 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2555 // failed to switch, state wasn't running?
2556 ShouldNotReachHere();
2557 return false;
2558 }
2559
2560 if (sr_notify(osthread) != 0) {
2561 ShouldNotReachHere();
2562 }
2563
2564 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2565 while (true) {
2566 if (sr_semaphore.timedwait(2)) {
2567 break;
2568 } else {
2569 // timeout
2570 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2571 if (cancelled == os::SuspendResume::SR_RUNNING) {
2572 return false;
2573 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2574 // make sure that we consume the signal on the semaphore as well
2575 sr_semaphore.wait();
2576 break;
2577 } else {
2578 ShouldNotReachHere();
2579 return false;
2580 }
2581 }
2582 }
2583
2584 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2585 return true;
2586 }
2587
2588 static void do_resume(OSThread* osthread) {
2589 assert(osthread->sr.is_suspended(), "thread should be suspended");
2590 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2591
2592 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2593 // failed to switch to WAKEUP_REQUEST
2594 ShouldNotReachHere();
2595 return;
2596 }
2597
2598 while (true) {
2599 if (sr_notify(osthread) == 0) {
2600 if (sr_semaphore.timedwait(2)) {
2601 if (osthread->sr.is_running()) {
2602 return;
2603 }
2604 }
2605 } else {
2606 ShouldNotReachHere();
2607 }
2608 }
2609
2610 guarantee(osthread->sr.is_running(), "Must be running!");
2611 }
2612
2613 ///////////////////////////////////////////////////////////////////////////////////
2614 // signal handling (except suspend/resume)
2615
2616 // This routine may be used by user applications as a "hook" to catch signals.
2617 // The user-defined signal handler must pass unrecognized signals to this
2618 // routine, and if it returns true (non-zero), then the signal handler must
2619 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2620 // routine will never retun false (zero), but instead will execute a VM panic
2621 // routine kill the process.
2622 //
2623 // If this routine returns false, it is OK to call it again. This allows
2624 // the user-defined signal handler to perform checks either before or after
2625 // the VM performs its own checks. Naturally, the user code would be making
2626 // a serious error if it tried to handle an exception (such as a null check
2627 // or breakpoint) that the VM was generating for its own correct operation.
2628 //
2629 // This routine may recognize any of the following kinds of signals:
2630 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2631 // It should be consulted by handlers for any of those signals.
2632 //
2633 // The caller of this routine must pass in the three arguments supplied
2634 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2635 // field of the structure passed to sigaction(). This routine assumes that
2636 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2637 //
2638 // Note that the VM will print warnings if it detects conflicting signal
2639 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2640 //
2641 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2642 void* ucontext,
2643 int abort_if_unrecognized);
2644
2645 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2646 assert(info != NULL && uc != NULL, "it must be old kernel");
2647 int orig_errno = errno; // Preserve errno value over signal handler.
2648 JVM_handle_bsd_signal(sig, info, uc, true);
2649 errno = orig_errno;
2650 }
2651
2652
2653 // This boolean allows users to forward their own non-matching signals
2654 // to JVM_handle_bsd_signal, harmlessly.
2655 bool os::Bsd::signal_handlers_are_installed = false;
2656
2657 // For signal-chaining
2658 bool os::Bsd::libjsig_is_loaded = false;
2659 typedef struct sigaction *(*get_signal_t)(int);
2660 get_signal_t os::Bsd::get_signal_action = NULL;
2661
2662 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2663 struct sigaction *actp = NULL;
2664
2665 if (libjsig_is_loaded) {
2666 // Retrieve the old signal handler from libjsig
2667 actp = (*get_signal_action)(sig);
2668 }
2669 if (actp == NULL) {
2670 // Retrieve the preinstalled signal handler from jvm
2671 actp = os::Posix::get_preinstalled_handler(sig);
2672 }
2673
2674 return actp;
2675 }
2676
2677 static bool call_chained_handler(struct sigaction *actp, int sig,
2678 siginfo_t *siginfo, void *context) {
2679 // Call the old signal handler
2680 if (actp->sa_handler == SIG_DFL) {
2681 // It's more reasonable to let jvm treat it as an unexpected exception
2682 // instead of taking the default action.
2683 return false;
2684 } else if (actp->sa_handler != SIG_IGN) {
2685 if ((actp->sa_flags & SA_NODEFER) == 0) {
2686 // automaticlly block the signal
2687 sigaddset(&(actp->sa_mask), sig);
2688 }
2689
2690 sa_handler_t hand;
2691 sa_sigaction_t sa;
2692 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2693 // retrieve the chained handler
2694 if (siginfo_flag_set) {
2695 sa = actp->sa_sigaction;
2696 } else {
2697 hand = actp->sa_handler;
2698 }
2699
2700 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2701 actp->sa_handler = SIG_DFL;
2702 }
2703
2704 // try to honor the signal mask
2705 sigset_t oset;
2706 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2707
2708 // call into the chained handler
2709 if (siginfo_flag_set) {
2710 (*sa)(sig, siginfo, context);
2711 } else {
2712 (*hand)(sig);
2713 }
2714
2715 // restore the signal mask
2716 pthread_sigmask(SIG_SETMASK, &oset, 0);
2717 }
2718 // Tell jvm's signal handler the signal is taken care of.
2719 return true;
2720 }
2721
2722 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2723 bool chained = false;
2724 // signal-chaining
2725 if (UseSignalChaining) {
2726 struct sigaction *actp = get_chained_signal_action(sig);
2727 if (actp != NULL) {
2728 chained = call_chained_handler(actp, sig, siginfo, context);
2729 }
2730 }
2731 return chained;
2732 }
2733
2734 // for diagnostic
2735 int sigflags[NSIG];
2736
2737 int os::Bsd::get_our_sigflags(int sig) {
2738 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2739 return sigflags[sig];
2740 }
2741
2742 void os::Bsd::set_our_sigflags(int sig, int flags) {
2743 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2744 if (sig > 0 && sig < NSIG) {
2745 sigflags[sig] = flags;
2746 }
2747 }
2748
2749 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2750 // Check for overwrite.
2751 struct sigaction oldAct;
2752 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2753
2754 void* oldhand = oldAct.sa_sigaction
2755 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2756 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2757 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2758 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2759 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2760 if (AllowUserSignalHandlers || !set_installed) {
2761 // Do not overwrite; user takes responsibility to forward to us.
2762 return;
2763 } else if (UseSignalChaining) {
2764 // save the old handler in jvm
2765 os::Posix::save_preinstalled_handler(sig, oldAct);
2766 // libjsig also interposes the sigaction() call below and saves the
2767 // old sigaction on it own.
2768 } else {
2769 fatal("Encountered unexpected pre-existing sigaction handler "
2770 "%#lx for signal %d.", (long)oldhand, sig);
2771 }
2772 }
2773
2774 struct sigaction sigAct;
2775 sigfillset(&(sigAct.sa_mask));
2776 sigAct.sa_handler = SIG_DFL;
2777 if (!set_installed) {
2778 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2779 } else {
2780 sigAct.sa_sigaction = signalHandler;
2781 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2782 }
2783 #ifdef __APPLE__
2784 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2785 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2786 // if the signal handler declares it will handle it on alternate stack.
2787 // Notice we only declare we will handle it on alt stack, but we are not
2788 // actually going to use real alt stack - this is just a workaround.
2789 // Please see ux_exception.c, method catch_mach_exception_raise for details
2790 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2791 if (sig == SIGSEGV) {
2792 sigAct.sa_flags |= SA_ONSTACK;
2793 }
2794 #endif
2795
2796 // Save flags, which are set by ours
2797 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2798 sigflags[sig] = sigAct.sa_flags;
2799
2800 int ret = sigaction(sig, &sigAct, &oldAct);
2801 assert(ret == 0, "check");
2802
2803 void* oldhand2 = oldAct.sa_sigaction
2804 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2805 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2806 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2807 }
2808
2809 // install signal handlers for signals that HotSpot needs to
2810 // handle in order to support Java-level exception handling.
2811
2812 void os::Bsd::install_signal_handlers() {
2813 if (!signal_handlers_are_installed) {
2814 signal_handlers_are_installed = true;
2815
2816 // signal-chaining
2817 typedef void (*signal_setting_t)();
2818 signal_setting_t begin_signal_setting = NULL;
2819 signal_setting_t end_signal_setting = NULL;
2820 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2821 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2822 if (begin_signal_setting != NULL) {
2823 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2824 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2825 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2826 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2827 libjsig_is_loaded = true;
2828 assert(UseSignalChaining, "should enable signal-chaining");
2829 }
2830 if (libjsig_is_loaded) {
2831 // Tell libjsig jvm is setting signal handlers
2832 (*begin_signal_setting)();
2833 }
2834
2835 set_signal_handler(SIGSEGV, true);
2836 set_signal_handler(SIGPIPE, true);
2837 set_signal_handler(SIGBUS, true);
2838 set_signal_handler(SIGILL, true);
2839 set_signal_handler(SIGFPE, true);
2840 set_signal_handler(SIGXFSZ, true);
2841
2842 #if defined(__APPLE__)
2843 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2844 // signals caught and handled by the JVM. To work around this, we reset the mach task
2845 // signal handler that's placed on our process by CrashReporter. This disables
2846 // CrashReporter-based reporting.
2847 //
2848 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2849 // on caught fatal signals.
2850 //
2851 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2852 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2853 // exception handling, while leaving the standard BSD signal handlers functional.
2854 kern_return_t kr;
2855 kr = task_set_exception_ports(mach_task_self(),
2856 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2857 MACH_PORT_NULL,
2858 EXCEPTION_STATE_IDENTITY,
2859 MACHINE_THREAD_STATE);
2860
2861 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2862 #endif
2863
2864 if (libjsig_is_loaded) {
2865 // Tell libjsig jvm finishes setting signal handlers
2866 (*end_signal_setting)();
2867 }
2868
2869 // We don't activate signal checker if libjsig is in place, we trust ourselves
2870 // and if UserSignalHandler is installed all bets are off
2871 if (CheckJNICalls) {
2872 if (libjsig_is_loaded) {
2873 if (PrintJNIResolving) {
2874 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
2875 }
2876 check_signals = false;
2877 }
2878 if (AllowUserSignalHandlers) {
2879 if (PrintJNIResolving) {
2880 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2881 }
2882 check_signals = false;
2883 }
2884 }
2885 }
2886 }
2887
2888
2889 /////
2890 // glibc on Bsd platform uses non-documented flag
2891 // to indicate, that some special sort of signal
2892 // trampoline is used.
2893 // We will never set this flag, and we should
2894 // ignore this flag in our diagnostic
2895 #ifdef SIGNIFICANT_SIGNAL_MASK
2896 #undef SIGNIFICANT_SIGNAL_MASK
2897 #endif
2898 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2899
2900 static const char* get_signal_handler_name(address handler,
2901 char* buf, int buflen) {
2902 int offset;
2903 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2904 if (found) {
2905 // skip directory names
2906 const char *p1, *p2;
2907 p1 = buf;
2908 size_t len = strlen(os::file_separator());
2909 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2910 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2911 } else {
2912 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2913 }
2914 return buf;
2915 }
2916
2917 static void print_signal_handler(outputStream* st, int sig,
2918 char* buf, size_t buflen) {
2919 struct sigaction sa;
2920
2921 sigaction(sig, NULL, &sa);
2922
2923 // See comment for SIGNIFICANT_SIGNAL_MASK define
2924 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2925
2926 st->print("%s: ", os::exception_name(sig, buf, buflen));
2927
2928 address handler = (sa.sa_flags & SA_SIGINFO)
2929 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2930 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2931
2932 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2933 st->print("SIG_DFL");
2934 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2935 st->print("SIG_IGN");
2936 } else {
2937 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2938 }
2939
2940 st->print(", sa_mask[0]=");
2941 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2942
2943 address rh = VMError::get_resetted_sighandler(sig);
2944 // May be, handler was resetted by VMError?
2945 if (rh != NULL) {
2946 handler = rh;
2947 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2948 }
2949
2950 st->print(", sa_flags=");
2951 os::Posix::print_sa_flags(st, sa.sa_flags);
2952
2953 // Check: is it our handler?
2954 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2955 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2956 // It is our signal handler
2957 // check for flags, reset system-used one!
2958 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2959 st->print(
2960 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2961 os::Bsd::get_our_sigflags(sig));
2962 }
2963 }
2964 st->cr();
2965 }
2966
2967
2968 #define DO_SIGNAL_CHECK(sig) \
2969 do { \
2970 if (!sigismember(&check_signal_done, sig)) { \
2971 os::Bsd::check_signal_handler(sig); \
2972 } \
2973 } while (0)
2974
2975 // This method is a periodic task to check for misbehaving JNI applications
2976 // under CheckJNI, we can add any periodic checks here
2977
2978 void os::run_periodic_checks() {
2979
2980 if (check_signals == false) return;
2981
2982 // SEGV and BUS if overridden could potentially prevent
2983 // generation of hs*.log in the event of a crash, debugging
2984 // such a case can be very challenging, so we absolutely
2985 // check the following for a good measure:
2986 DO_SIGNAL_CHECK(SIGSEGV);
2987 DO_SIGNAL_CHECK(SIGILL);
2988 DO_SIGNAL_CHECK(SIGFPE);
2989 DO_SIGNAL_CHECK(SIGBUS);
2990 DO_SIGNAL_CHECK(SIGPIPE);
2991 DO_SIGNAL_CHECK(SIGXFSZ);
2992
2993
2994 // ReduceSignalUsage allows the user to override these handlers
2995 // see comments at the very top and jvm_md.h
2996 if (!ReduceSignalUsage) {
2997 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
2998 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
2999 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3000 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3001 }
3002
3003 DO_SIGNAL_CHECK(SR_signum);
3004 }
3005
3006 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3007
3008 static os_sigaction_t os_sigaction = NULL;
3009
3010 void os::Bsd::check_signal_handler(int sig) {
3011 char buf[O_BUFLEN];
3012 address jvmHandler = NULL;
3013
3014
3015 struct sigaction act;
3016 if (os_sigaction == NULL) {
3017 // only trust the default sigaction, in case it has been interposed
3018 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3019 if (os_sigaction == NULL) return;
3020 }
3021
3022 os_sigaction(sig, (struct sigaction*)NULL, &act);
3023
3024
3025 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3026
3027 address thisHandler = (act.sa_flags & SA_SIGINFO)
3028 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3029 : CAST_FROM_FN_PTR(address, act.sa_handler);
3030
3031
3032 switch (sig) {
3033 case SIGSEGV:
3034 case SIGBUS:
3035 case SIGFPE:
3036 case SIGPIPE:
3037 case SIGILL:
3038 case SIGXFSZ:
3039 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3040 break;
3041
3042 case SHUTDOWN1_SIGNAL:
3043 case SHUTDOWN2_SIGNAL:
3044 case SHUTDOWN3_SIGNAL:
3045 case BREAK_SIGNAL:
3046 jvmHandler = (address)user_handler();
3047 break;
3048
3049 default:
3050 if (sig == SR_signum) {
3051 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3052 } else {
3053 return;
3054 }
3055 break;
3056 }
3057
3058 if (thisHandler != jvmHandler) {
3059 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3060 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3061 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3062 // No need to check this sig any longer
3063 sigaddset(&check_signal_done, sig);
3064 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3065 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3066 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3067 exception_name(sig, buf, O_BUFLEN));
3068 }
3069 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3070 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3071 tty->print("expected:");
3072 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3073 tty->cr();
3074 tty->print(" found:");
3075 os::Posix::print_sa_flags(tty, act.sa_flags);
3076 tty->cr();
3077 // No need to check this sig any longer
3078 sigaddset(&check_signal_done, sig);
3079 }
3080
3081 // Dump all the signal
3082 if (sigismember(&check_signal_done, sig)) {
3083 print_signal_handlers(tty, buf, O_BUFLEN);
3084 }
3085 }
3086
3087 extern void report_error(char* file_name, int line_no, char* title,
3088 char* format, ...);
3089
3090 // this is called _before_ the most of global arguments have been parsed
3091 void os::init(void) {
3092 char dummy; // used to get a guess on initial stack address
3093
3094 // With BsdThreads the JavaMain thread pid (primordial thread)
3095 // is different than the pid of the java launcher thread.
3096 // So, on Bsd, the launcher thread pid is passed to the VM
3097 // via the sun.java.launcher.pid property.
3098 // Use this property instead of getpid() if it was correctly passed.
3099 // See bug 6351349.
3100 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3101
3102 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3103
3104 clock_tics_per_sec = CLK_TCK;
3105
3106 init_random(1234567);
3107
3108 Bsd::set_page_size(getpagesize());
3109 if (Bsd::page_size() == -1) {
3110 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3111 }
3112 init_page_sizes((size_t) Bsd::page_size());
3113
3114 Bsd::initialize_system_info();
3115
3116 // _main_thread points to the thread that created/loaded the JVM.
3117 Bsd::_main_thread = pthread_self();
3118
3119 Bsd::clock_init();
3120 initial_time_count = javaTimeNanos();
3121
3122 os::Posix::init();
3123 }
3124
3125 // To install functions for atexit system call
3126 extern "C" {
3127 static void perfMemory_exit_helper() {
3128 perfMemory_exit();
3129 }
3130 }
3131
3132 // this is called _after_ the global arguments have been parsed
3133 jint os::init_2(void) {
3134
3135 // This could be set after os::Posix::init() but all platforms
3136 // have to set it the same so we have to mirror Solaris.
3137 DEBUG_ONLY(os::set_mutex_init_done();)
3138
3139 os::Posix::init_2();
3140
3141 // initialize suspend/resume support - must do this before signal_sets_init()
3142 if (SR_initialize() != 0) {
3143 perror("SR_initialize failed");
3144 return JNI_ERR;
3145 }
3146
3147 Bsd::signal_sets_init();
3148 Bsd::install_signal_handlers();
3149 // Initialize data for jdk.internal.misc.Signal
3150 if (!ReduceSignalUsage) {
3151 jdk_misc_signal_init();
3152 }
3153
3154 // Check and sets minimum stack sizes against command line options
3155 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3156 return JNI_ERR;
3157 }
3158
3159 if (MaxFDLimit) {
3160 // set the number of file descriptors to max. print out error
3161 // if getrlimit/setrlimit fails but continue regardless.
3162 struct rlimit nbr_files;
3163 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3164 if (status != 0) {
3165 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3166 } else {
3167 nbr_files.rlim_cur = nbr_files.rlim_max;
3168
3169 #ifdef __APPLE__
3170 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3171 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3172 // be used instead
3173 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3174 #endif
3175
3176 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3177 if (status != 0) {
3178 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3179 }
3180 }
3181 }
3182
3183 // at-exit methods are called in the reverse order of their registration.
3184 // atexit functions are called on return from main or as a result of a
3185 // call to exit(3C). There can be only 32 of these functions registered
3186 // and atexit() does not set errno.
3187
3188 if (PerfAllowAtExitRegistration) {
3189 // only register atexit functions if PerfAllowAtExitRegistration is set.
3190 // atexit functions can be delayed until process exit time, which
3191 // can be problematic for embedded VM situations. Embedded VMs should
3192 // call DestroyJavaVM() to assure that VM resources are released.
3193
3194 // note: perfMemory_exit_helper atexit function may be removed in
3195 // the future if the appropriate cleanup code can be added to the
3196 // VM_Exit VMOperation's doit method.
3197 if (atexit(perfMemory_exit_helper) != 0) {
3198 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3199 }
3200 }
3201
3202 // initialize thread priority policy
3203 prio_init();
3204
3205 #ifdef __APPLE__
3206 // dynamically link to objective c gc registration
3207 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3208 if (handleLibObjc != NULL) {
3209 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3210 }
3211 #endif
3212
3213 return JNI_OK;
3214 }
3215
3216 // Mark the polling page as unreadable
3217 void os::make_polling_page_unreadable(void) {
3218 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3219 fatal("Could not disable polling page");
3220 }
3221 }
3222
3223 // Mark the polling page as readable
3224 void os::make_polling_page_readable(void) {
3225 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3226 fatal("Could not enable polling page");
3227 }
3228 }
3229
3230 int os::active_processor_count() {
3231 // User has overridden the number of active processors
3232 if (ActiveProcessorCount > 0) {
3233 log_trace(os)("active_processor_count: "
3234 "active processor count set by user : %d",
3235 ActiveProcessorCount);
3236 return ActiveProcessorCount;
3237 }
3238
3239 return _processor_count;
3240 }
3241
3242 #ifdef __APPLE__
3243 uint os::processor_id() {
3244 static volatile int* volatile apic_to_cpu_mapping = NULL;
3245 static volatile int next_cpu_id = 0;
3246
3247 volatile int* mapping = OrderAccess::load_acquire(&apic_to_cpu_mapping);
3248 if (mapping == NULL) {
3249 // Calculate possible number space for APIC ids. This space is not necessarily
3250 // in the range [0, number_of_cpus).
3251 uint total_bits = 0;
3252 for (uint i = 0;; ++i) {
3253 uint eax = 0xb; // Query topology leaf
3254 uint ebx;
3255 uint ecx = i;
3256 uint edx;
3257
3258 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3259
3260 uint level_type = (ecx >> 8) & 0xFF;
3261 if (level_type == 0) {
3262 // Invalid level; end of topology
3263 break;
3264 }
3265 uint level_apic_id_shift = eax & ((1u << 5) - 1);
3266 total_bits += level_apic_id_shift;
3267 }
3268
3269 uint max_apic_ids = 1u << total_bits;
3270 mapping = NEW_C_HEAP_ARRAY(int, max_apic_ids, mtInternal);
3271
3272 for (uint i = 0; i < max_apic_ids; ++i) {
3273 mapping[i] = -1;
3274 }
3275
3276 if (!Atomic::replace_if_null(mapping, &apic_to_cpu_mapping)) {
3277 FREE_C_HEAP_ARRAY(int, mapping);
3278 mapping = OrderAccess::load_acquire(&apic_to_cpu_mapping);
3279 }
3280 }
3281
3282 uint eax = 0xb;
3283 uint ebx;
3284 uint ecx = 0;
3285 uint edx;
3286
3287 asm ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3288
3289 // Map from APIC id to a unique logical processor ID in the expected
3290 // [0, num_processors) range.
3291
3292 uint apic_id = edx;
3293 int cpu_id = Atomic::load(&mapping[apic_id]);
3294
3295 while (cpu_id < 0) {
3296 if (Atomic::cmpxchg(-2, &mapping[apic_id], -1)) {
3297 Atomic::store(Atomic::add(1, &next_cpu_id) - 1, &mapping[apic_id]);
3298 }
3299 cpu_id = Atomic::load(&mapping[apic_id]);
3300 }
3301
3302 return (uint)cpu_id;
3303 }
3304 #endif
3305
3306 void os::set_native_thread_name(const char *name) {
3307 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3308 // This is only supported in Snow Leopard and beyond
3309 if (name != NULL) {
3310 // Add a "Java: " prefix to the name
3311 char buf[MAXTHREADNAMESIZE];
3312 snprintf(buf, sizeof(buf), "Java: %s", name);
3313 pthread_setname_np(buf);
3314 }
3315 #endif
3316 }
3317
3318 bool os::distribute_processes(uint length, uint* distribution) {
3319 // Not yet implemented.
3320 return false;
3321 }
3322
3323 bool os::bind_to_processor(uint processor_id) {
3324 // Not yet implemented.
3325 return false;
3326 }
3327
3328 void os::SuspendedThreadTask::internal_do_task() {
3329 if (do_suspend(_thread->osthread())) {
3330 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3331 do_task(context);
3332 do_resume(_thread->osthread());
3333 }
3334 }
3335
3336 ////////////////////////////////////////////////////////////////////////////////
3337 // debug support
3338
3339 bool os::find(address addr, outputStream* st) {
3340 Dl_info dlinfo;
3341 memset(&dlinfo, 0, sizeof(dlinfo));
3342 if (dladdr(addr, &dlinfo) != 0) {
3343 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3344 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3345 st->print("%s+%#x", dlinfo.dli_sname,
3346 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3347 } else if (dlinfo.dli_fbase != NULL) {
3348 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3349 } else {
3350 st->print("<absolute address>");
3351 }
3352 if (dlinfo.dli_fname != NULL) {
3353 st->print(" in %s", dlinfo.dli_fname);
3354 }
3355 if (dlinfo.dli_fbase != NULL) {
3356 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3357 }
3358 st->cr();
3359
3360 if (Verbose) {
3361 // decode some bytes around the PC
3362 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3363 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3364 address lowest = (address) dlinfo.dli_sname;
3365 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3366 if (begin < lowest) begin = lowest;
3367 Dl_info dlinfo2;
3368 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3369 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3370 end = (address) dlinfo2.dli_saddr;
3371 }
3372 Disassembler::decode(begin, end, st);
3373 }
3374 return true;
3375 }
3376 return false;
3377 }
3378
3379 ////////////////////////////////////////////////////////////////////////////////
3380 // misc
3381
3382 // This does not do anything on Bsd. This is basically a hook for being
3383 // able to use structured exception handling (thread-local exception filters)
3384 // on, e.g., Win32.
3385 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3386 const methodHandle& method, JavaCallArguments* args,
3387 Thread* thread) {
3388 f(value, method, args, thread);
3389 }
3390
3391 void os::print_statistics() {
3392 }
3393
3394 bool os::message_box(const char* title, const char* message) {
3395 int i;
3396 fdStream err(defaultStream::error_fd());
3397 for (i = 0; i < 78; i++) err.print_raw("=");
3398 err.cr();
3399 err.print_raw_cr(title);
3400 for (i = 0; i < 78; i++) err.print_raw("-");
3401 err.cr();
3402 err.print_raw_cr(message);
3403 for (i = 0; i < 78; i++) err.print_raw("=");
3404 err.cr();
3405
3406 char buf[16];
3407 // Prevent process from exiting upon "read error" without consuming all CPU
3408 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3409
3410 return buf[0] == 'y' || buf[0] == 'Y';
3411 }
3412
3413 static inline struct timespec get_mtime(const char* filename) {
3414 struct stat st;
3415 int ret = os::stat(filename, &st);
3416 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3417 #ifdef __APPLE__
3418 return st.st_mtimespec;
3419 #else
3420 return st.st_mtim;
3421 #endif
3422 }
3423
3424 int os::compare_file_modified_times(const char* file1, const char* file2) {
3425 struct timespec filetime1 = get_mtime(file1);
3426 struct timespec filetime2 = get_mtime(file2);
3427 int diff = filetime1.tv_sec - filetime2.tv_sec;
3428 if (diff == 0) {
3429 return filetime1.tv_nsec - filetime2.tv_nsec;
3430 }
3431 return diff;
3432 }
3433
3434 // Is a (classpath) directory empty?
3435 bool os::dir_is_empty(const char* path) {
3436 DIR *dir = NULL;
3437 struct dirent *ptr;
3438
3439 dir = opendir(path);
3440 if (dir == NULL) return true;
3441
3442 // Scan the directory
3443 bool result = true;
3444 while (result && (ptr = readdir(dir)) != NULL) {
3445 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3446 result = false;
3447 }
3448 }
3449 closedir(dir);
3450 return result;
3451 }
3452
3453 // This code originates from JDK's sysOpen and open64_w
3454 // from src/solaris/hpi/src/system_md.c
3455
3456 int os::open(const char *path, int oflag, int mode) {
3457 if (strlen(path) > MAX_PATH - 1) {
3458 errno = ENAMETOOLONG;
3459 return -1;
3460 }
3461 int fd;
3462
3463 fd = ::open(path, oflag, mode);
3464 if (fd == -1) return -1;
3465
3466 // If the open succeeded, the file might still be a directory
3467 {
3468 struct stat buf;
3469 int ret = ::fstat(fd, &buf);
3470 int st_mode = buf.st_mode;
3471
3472 if (ret != -1) {
3473 if ((st_mode & S_IFMT) == S_IFDIR) {
3474 errno = EISDIR;
3475 ::close(fd);
3476 return -1;
3477 }
3478 } else {
3479 ::close(fd);
3480 return -1;
3481 }
3482 }
3483
3484 // All file descriptors that are opened in the JVM and not
3485 // specifically destined for a subprocess should have the
3486 // close-on-exec flag set. If we don't set it, then careless 3rd
3487 // party native code might fork and exec without closing all
3488 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3489 // UNIXProcess.c), and this in turn might:
3490 //
3491 // - cause end-of-file to fail to be detected on some file
3492 // descriptors, resulting in mysterious hangs, or
3493 //
3494 // - might cause an fopen in the subprocess to fail on a system
3495 // suffering from bug 1085341.
3496 //
3497 // (Yes, the default setting of the close-on-exec flag is a Unix
3498 // design flaw)
3499 //
3500 // See:
3501 // 1085341: 32-bit stdio routines should support file descriptors >255
3502 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3503 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3504 //
3505 #ifdef FD_CLOEXEC
3506 {
3507 int flags = ::fcntl(fd, F_GETFD);
3508 if (flags != -1) {
3509 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3510 }
3511 }
3512 #endif
3513
3514 return fd;
3515 }
3516
3517
3518 // create binary file, rewriting existing file if required
3519 int os::create_binary_file(const char* path, bool rewrite_existing) {
3520 int oflags = O_WRONLY | O_CREAT;
3521 if (!rewrite_existing) {
3522 oflags |= O_EXCL;
3523 }
3524 return ::open(path, oflags, S_IREAD | S_IWRITE);
3525 }
3526
3527 // return current position of file pointer
3528 jlong os::current_file_offset(int fd) {
3529 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3530 }
3531
3532 // move file pointer to the specified offset
3533 jlong os::seek_to_file_offset(int fd, jlong offset) {
3534 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3535 }
3536
3537 // This code originates from JDK's sysAvailable
3538 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3539
3540 int os::available(int fd, jlong *bytes) {
3541 jlong cur, end;
3542 int mode;
3543 struct stat buf;
3544
3545 if (::fstat(fd, &buf) >= 0) {
3546 mode = buf.st_mode;
3547 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3548 int n;
3549 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3550 *bytes = n;
3551 return 1;
3552 }
3553 }
3554 }
3555 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3556 return 0;
3557 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3558 return 0;
3559 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3560 return 0;
3561 }
3562 *bytes = end - cur;
3563 return 1;
3564 }
3565
3566 // Map a block of memory.
3567 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3568 char *addr, size_t bytes, bool read_only,
3569 bool allow_exec) {
3570 int prot;
3571 int flags;
3572
3573 if (read_only) {
3574 prot = PROT_READ;
3575 flags = MAP_SHARED;
3576 } else {
3577 prot = PROT_READ | PROT_WRITE;
3578 flags = MAP_PRIVATE;
3579 }
3580
3581 if (allow_exec) {
3582 prot |= PROT_EXEC;
3583 }
3584
3585 if (addr != NULL) {
3586 flags |= MAP_FIXED;
3587 }
3588
3589 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3590 fd, file_offset);
3591 if (mapped_address == MAP_FAILED) {
3592 return NULL;
3593 }
3594 return mapped_address;
3595 }
3596
3597
3598 // Remap a block of memory.
3599 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3600 char *addr, size_t bytes, bool read_only,
3601 bool allow_exec) {
3602 // same as map_memory() on this OS
3603 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3604 allow_exec);
3605 }
3606
3607
3608 // Unmap a block of memory.
3609 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3610 return munmap(addr, bytes) == 0;
3611 }
3612
3613 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3614 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3615 // of a thread.
3616 //
3617 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3618 // the fast estimate available on the platform.
3619
3620 jlong os::current_thread_cpu_time() {
3621 #ifdef __APPLE__
3622 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3623 #else
3624 Unimplemented();
3625 return 0;
3626 #endif
3627 }
3628
3629 jlong os::thread_cpu_time(Thread* thread) {
3630 #ifdef __APPLE__
3631 return os::thread_cpu_time(thread, true /* user + sys */);
3632 #else
3633 Unimplemented();
3634 return 0;
3635 #endif
3636 }
3637
3638 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3639 #ifdef __APPLE__
3640 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3641 #else
3642 Unimplemented();
3643 return 0;
3644 #endif
3645 }
3646
3647 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3648 #ifdef __APPLE__
3649 struct thread_basic_info tinfo;
3650 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3651 kern_return_t kr;
3652 thread_t mach_thread;
3653
3654 mach_thread = thread->osthread()->thread_id();
3655 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3656 if (kr != KERN_SUCCESS) {
3657 return -1;
3658 }
3659
3660 if (user_sys_cpu_time) {
3661 jlong nanos;
3662 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3663 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3664 return nanos;
3665 } else {
3666 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3667 }
3668 #else
3669 Unimplemented();
3670 return 0;
3671 #endif
3672 }
3673
3674
3675 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3676 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3677 info_ptr->may_skip_backward = false; // elapsed time not wall time
3678 info_ptr->may_skip_forward = false; // elapsed time not wall time
3679 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3680 }
3681
3682 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3683 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3684 info_ptr->may_skip_backward = false; // elapsed time not wall time
3685 info_ptr->may_skip_forward = false; // elapsed time not wall time
3686 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3687 }
3688
3689 bool os::is_thread_cpu_time_supported() {
3690 #ifdef __APPLE__
3691 return true;
3692 #else
3693 return false;
3694 #endif
3695 }
3696
3697 // System loadavg support. Returns -1 if load average cannot be obtained.
3698 // Bsd doesn't yet have a (official) notion of processor sets,
3699 // so just return the system wide load average.
3700 int os::loadavg(double loadavg[], int nelem) {
3701 return ::getloadavg(loadavg, nelem);
3702 }
3703
3704 void os::pause() {
3705 char filename[MAX_PATH];
3706 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3707 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3708 } else {
3709 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3710 }
3711
3712 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3713 if (fd != -1) {
3714 struct stat buf;
3715 ::close(fd);
3716 while (::stat(filename, &buf) == 0) {
3717 (void)::poll(NULL, 0, 100);
3718 }
3719 } else {
3720 jio_fprintf(stderr,
3721 "Could not open pause file '%s', continuing immediately.\n", filename);
3722 }
3723 }
3724
3725 // Darwin has no "environ" in a dynamic library.
3726 #ifdef __APPLE__
3727 #include <crt_externs.h>
3728 #define environ (*_NSGetEnviron())
3729 #else
3730 extern char** environ;
3731 #endif
3732
3733 // Run the specified command in a separate process. Return its exit value,
3734 // or -1 on failure (e.g. can't fork a new process).
3735 // Unlike system(), this function can be called from signal handler. It
3736 // doesn't block SIGINT et al.
3737 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3738 const char * argv[4] = {"sh", "-c", cmd, NULL};
3739
3740 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3741 // pthread_atfork handlers and reset pthread library. All we need is a
3742 // separate process to execve. Make a direct syscall to fork process.
3743 // On IA64 there's no fork syscall, we have to use fork() and hope for
3744 // the best...
3745 pid_t pid = fork();
3746
3747 if (pid < 0) {
3748 // fork failed
3749 return -1;
3750
3751 } else if (pid == 0) {
3752 // child process
3753
3754 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3755 // first to kill every thread on the thread list. Because this list is
3756 // not reset by fork() (see notes above), execve() will instead kill
3757 // every thread in the parent process. We know this is the only thread
3758 // in the new process, so make a system call directly.
3759 // IA64 should use normal execve() from glibc to match the glibc fork()
3760 // above.
3761 execve("/bin/sh", (char* const*)argv, environ);
3762
3763 // execve failed
3764 _exit(-1);
3765
3766 } else {
3767 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3768 // care about the actual exit code, for now.
3769
3770 int status;
3771
3772 // Wait for the child process to exit. This returns immediately if
3773 // the child has already exited. */
3774 while (waitpid(pid, &status, 0) < 0) {
3775 switch (errno) {
3776 case ECHILD: return 0;
3777 case EINTR: break;
3778 default: return -1;
3779 }
3780 }
3781
3782 if (WIFEXITED(status)) {
3783 // The child exited normally; get its exit code.
3784 return WEXITSTATUS(status);
3785 } else if (WIFSIGNALED(status)) {
3786 // The child exited because of a signal
3787 // The best value to return is 0x80 + signal number,
3788 // because that is what all Unix shells do, and because
3789 // it allows callers to distinguish between process exit and
3790 // process death by signal.
3791 return 0x80 + WTERMSIG(status);
3792 } else {
3793 // Unknown exit code; pass it through
3794 return status;
3795 }
3796 }
3797 }
3798
3799 // Get the default path to the core file
3800 // Returns the length of the string
3801 int os::get_core_path(char* buffer, size_t bufferSize) {
3802 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
3803
3804 // Truncate if theoretical string was longer than bufferSize
3805 n = MIN2(n, (int)bufferSize);
3806
3807 return n;
3808 }
3809
3810 bool os::supports_map_sync() {
3811 return false;
3812 }
3813
3814 #ifndef PRODUCT
3815 void TestReserveMemorySpecial_test() {
3816 // No tests available for this platform
3817 }
3818 #endif
3819
3820 bool os::start_debugging(char *buf, int buflen) {
3821 int len = (int)strlen(buf);
3822 char *p = &buf[len];
3823
3824 jio_snprintf(p, buflen-len,
3825 "\n\n"
3826 "Do you want to debug the problem?\n\n"
3827 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3828 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3829 "Otherwise, press RETURN to abort...",
3830 os::current_process_id(), os::current_process_id(),
3831 os::current_thread_id(), os::current_thread_id());
3832
3833 bool yes = os::message_box("Unexpected Error", buf);
3834
3835 if (yes) {
3836 // yes, user asked VM to launch debugger
3837 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3838 os::current_process_id(), os::current_process_id());
3839
3840 os::fork_and_exec(buf);
3841 yes = false;
3842 }
3843 return yes;
3844 }