1 /*
2 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_bsd.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_bsd.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_bsd.inline.hpp"
40 #include "os_share_bsd.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm.h"
43 #include "prims/jvm_misc.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/atomic.inline.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/orderAccess.inline.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "semaphore_bsd.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 // put OS-includes here
73 # include <sys/types.h>
74 # include <sys/mman.h>
75 # include <sys/stat.h>
76 # include <sys/select.h>
77 # include <pthread.h>
78 # include <signal.h>
79 # include <errno.h>
80 # include <dlfcn.h>
81 # include <stdio.h>
82 # include <unistd.h>
83 # include <sys/resource.h>
84 # include <pthread.h>
85 # include <sys/stat.h>
86 # include <sys/time.h>
87 # include <sys/times.h>
88 # include <sys/utsname.h>
89 # include <sys/socket.h>
90 # include <sys/wait.h>
91 # include <time.h>
92 # include <pwd.h>
93 # include <poll.h>
94 # include <semaphore.h>
95 # include <fcntl.h>
96 # include <string.h>
97 # include <sys/param.h>
98 # include <sys/sysctl.h>
99 # include <sys/ipc.h>
100 # include <sys/shm.h>
101 #ifndef __APPLE__
102 # include <link.h>
103 #endif
104 # include <stdint.h>
105 # include <inttypes.h>
106 # include <sys/ioctl.h>
107 # include <sys/syscall.h>
108
109 #if defined(__FreeBSD__) || defined(__NetBSD__)
110 #include <elf.h>
111 #endif
112
113 #ifdef __APPLE__
114 #include <mach/mach.h> // semaphore_* API
115 #include <mach-o/dyld.h>
116 #include <sys/proc_info.h>
117 #include <objc/objc-auto.h>
118 #endif
119
120 #ifndef MAP_ANONYMOUS
121 #define MAP_ANONYMOUS MAP_ANON
122 #endif
123
124 #define MAX_PATH (2 * K)
125
126 // for timer info max values which include all bits
127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
128
129 #define LARGEPAGES_BIT (1 << 6)
130
131 ////////////////////////////////////////////////////////////////////////////////
132 // global variables
133 julong os::Bsd::_physical_memory = 0;
134
135 #ifdef __APPLE__
136 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
137 volatile uint64_t os::Bsd::_max_abstime = 0;
138 #else
139 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
140 #endif
141 pthread_t os::Bsd::_main_thread;
142 int os::Bsd::_page_size = -1;
143
144 static jlong initial_time_count=0;
145
146 static int clock_tics_per_sec = 100;
147
148 // For diagnostics to print a message once. see run_periodic_checks
149 static sigset_t check_signal_done;
150 static bool check_signals = true;
151
152 static pid_t _initial_pid = 0;
153
154 // Signal number used to suspend/resume a thread
155
156 // do not use any signal number less than SIGSEGV, see 4355769
157 static int SR_signum = SIGUSR2;
158 sigset_t SR_sigset;
159
160
161 ////////////////////////////////////////////////////////////////////////////////
162 // utility functions
163
164 static int SR_initialize();
165 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
166
167 julong os::available_memory() {
168 return Bsd::available_memory();
169 }
170
171 // available here means free
172 julong os::Bsd::available_memory() {
173 uint64_t available = physical_memory() >> 2;
174 #ifdef __APPLE__
175 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
176 vm_statistics64_data_t vmstat;
177 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
178 (host_info64_t)&vmstat, &count);
179 assert(kerr == KERN_SUCCESS,
180 "host_statistics64 failed - check mach_host_self() and count");
181 if (kerr == KERN_SUCCESS) {
182 available = vmstat.free_count * os::vm_page_size();
183 }
184 #endif
185 return available;
186 }
187
188 julong os::physical_memory() {
189 return Bsd::physical_memory();
190 }
191
192 // Return true if user is running as root.
193
194 bool os::have_special_privileges() {
195 static bool init = false;
196 static bool privileges = false;
197 if (!init) {
198 privileges = (getuid() != geteuid()) || (getgid() != getegid());
199 init = true;
200 }
201 return privileges;
202 }
203
204
205
206 // Cpu architecture string
207 #if defined(ZERO)
208 static char cpu_arch[] = ZERO_LIBARCH;
209 #elif defined(IA64)
210 static char cpu_arch[] = "ia64";
211 #elif defined(IA32)
212 static char cpu_arch[] = "i386";
213 #elif defined(AMD64)
214 static char cpu_arch[] = "amd64";
215 #elif defined(ARM)
216 static char cpu_arch[] = "arm";
217 #elif defined(PPC32)
218 static char cpu_arch[] = "ppc";
219 #elif defined(SPARC)
220 #ifdef _LP64
221 static char cpu_arch[] = "sparcv9";
222 #else
223 static char cpu_arch[] = "sparc";
224 #endif
225 #else
226 #error Add appropriate cpu_arch setting
227 #endif
228
229 // Compiler variant
230 #ifdef COMPILER2
231 #define COMPILER_VARIANT "server"
232 #else
233 #define COMPILER_VARIANT "client"
234 #endif
235
236
237 void os::Bsd::initialize_system_info() {
238 int mib[2];
239 size_t len;
240 int cpu_val;
241 julong mem_val;
242
243 // get processors count via hw.ncpus sysctl
244 mib[0] = CTL_HW;
245 mib[1] = HW_NCPU;
246 len = sizeof(cpu_val);
247 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
248 assert(len == sizeof(cpu_val), "unexpected data size");
249 set_processor_count(cpu_val);
250 } else {
251 set_processor_count(1); // fallback
252 }
253
254 // get physical memory via hw.memsize sysctl (hw.memsize is used
255 // since it returns a 64 bit value)
256 mib[0] = CTL_HW;
257
258 #if defined (HW_MEMSIZE) // Apple
259 mib[1] = HW_MEMSIZE;
260 #elif defined(HW_PHYSMEM) // Most of BSD
261 mib[1] = HW_PHYSMEM;
262 #elif defined(HW_REALMEM) // Old FreeBSD
263 mib[1] = HW_REALMEM;
264 #else
265 #error No ways to get physmem
266 #endif
267
268 len = sizeof(mem_val);
269 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
270 assert(len == sizeof(mem_val), "unexpected data size");
271 _physical_memory = mem_val;
272 } else {
273 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
274 }
275
276 #ifdef __OpenBSD__
277 {
278 // limit _physical_memory memory view on OpenBSD since
279 // datasize rlimit restricts us anyway.
280 struct rlimit limits;
281 getrlimit(RLIMIT_DATA, &limits);
282 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
283 }
284 #endif
285 }
286
287 #ifdef __APPLE__
288 static const char *get_home() {
289 const char *home_dir = ::getenv("HOME");
290 if ((home_dir == NULL) || (*home_dir == '\0')) {
291 struct passwd *passwd_info = getpwuid(geteuid());
292 if (passwd_info != NULL) {
293 home_dir = passwd_info->pw_dir;
294 }
295 }
296
297 return home_dir;
298 }
299 #endif
300
301 void os::init_system_properties_values() {
302 // The next steps are taken in the product version:
303 //
304 // Obtain the JAVA_HOME value from the location of libjvm.so.
305 // This library should be located at:
306 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
307 //
308 // If "/jre/lib/" appears at the right place in the path, then we
309 // assume libjvm.so is installed in a JDK and we use this path.
310 //
311 // Otherwise exit with message: "Could not create the Java virtual machine."
312 //
313 // The following extra steps are taken in the debugging version:
314 //
315 // If "/jre/lib/" does NOT appear at the right place in the path
316 // instead of exit check for $JAVA_HOME environment variable.
317 //
318 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
319 // then we append a fake suffix "hotspot/libjvm.so" to this path so
320 // it looks like libjvm.so is installed there
321 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
322 //
323 // Otherwise exit.
324 //
325 // Important note: if the location of libjvm.so changes this
326 // code needs to be changed accordingly.
327
328 // See ld(1):
329 // The linker uses the following search paths to locate required
330 // shared libraries:
331 // 1: ...
332 // ...
333 // 7: The default directories, normally /lib and /usr/lib.
334 #ifndef DEFAULT_LIBPATH
335 #define DEFAULT_LIBPATH "/lib:/usr/lib"
336 #endif
337
338 // Base path of extensions installed on the system.
339 #define SYS_EXT_DIR "/usr/java/packages"
340 #define EXTENSIONS_DIR "/lib/ext"
341
342 #ifndef __APPLE__
343
344 // Buffer that fits several sprintfs.
345 // Note that the space for the colon and the trailing null are provided
346 // by the nulls included by the sizeof operator.
347 const size_t bufsize =
348 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
349 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
350 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
351
352 // sysclasspath, java_home, dll_dir
353 {
354 char *pslash;
355 os::jvm_path(buf, bufsize);
356
357 // Found the full path to libjvm.so.
358 // Now cut the path to <java_home>/jre if we can.
359 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
360 pslash = strrchr(buf, '/');
361 if (pslash != NULL) {
362 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
363 }
364 Arguments::set_dll_dir(buf);
365
366 if (pslash != NULL) {
367 pslash = strrchr(buf, '/');
368 if (pslash != NULL) {
369 *pslash = '\0'; // Get rid of /<arch>.
370 pslash = strrchr(buf, '/');
371 if (pslash != NULL) {
372 *pslash = '\0'; // Get rid of /lib.
373 }
374 }
375 }
376 Arguments::set_java_home(buf);
377 set_boot_path('/', ':');
378 }
379
380 // Where to look for native libraries.
381 //
382 // Note: Due to a legacy implementation, most of the library path
383 // is set in the launcher. This was to accomodate linking restrictions
384 // on legacy Bsd implementations (which are no longer supported).
385 // Eventually, all the library path setting will be done here.
386 //
387 // However, to prevent the proliferation of improperly built native
388 // libraries, the new path component /usr/java/packages is added here.
389 // Eventually, all the library path setting will be done here.
390 {
391 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
392 // should always exist (until the legacy problem cited above is
393 // addressed).
394 const char *v = ::getenv("LD_LIBRARY_PATH");
395 const char *v_colon = ":";
396 if (v == NULL) { v = ""; v_colon = ""; }
397 // That's +1 for the colon and +1 for the trailing '\0'.
398 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
399 strlen(v) + 1 +
400 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
401 mtInternal);
402 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
403 Arguments::set_library_path(ld_library_path);
404 FREE_C_HEAP_ARRAY(char, ld_library_path);
405 }
406
407 // Extensions directories.
408 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
409 Arguments::set_ext_dirs(buf);
410
411 FREE_C_HEAP_ARRAY(char, buf);
412
413 #else // __APPLE__
414
415 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
416 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
417
418 const char *user_home_dir = get_home();
419 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
420 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
421 sizeof(SYS_EXTENSIONS_DIRS);
422
423 // Buffer that fits several sprintfs.
424 // Note that the space for the colon and the trailing null are provided
425 // by the nulls included by the sizeof operator.
426 const size_t bufsize =
427 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
428 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
429 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
430
431 // sysclasspath, java_home, dll_dir
432 {
433 char *pslash;
434 os::jvm_path(buf, bufsize);
435
436 // Found the full path to libjvm.so.
437 // Now cut the path to <java_home>/jre if we can.
438 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
439 pslash = strrchr(buf, '/');
440 if (pslash != NULL) {
441 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
442 }
443 #ifdef STATIC_BUILD
444 strcat(buf, "/lib");
445 #endif
446
447 Arguments::set_dll_dir(buf);
448
449 if (pslash != NULL) {
450 pslash = strrchr(buf, '/');
451 if (pslash != NULL) {
452 *pslash = '\0'; // Get rid of /lib.
453 }
454 }
455 Arguments::set_java_home(buf);
456 set_boot_path('/', ':');
457 }
458
459 // Where to look for native libraries.
460 //
461 // Note: Due to a legacy implementation, most of the library path
462 // is set in the launcher. This was to accomodate linking restrictions
463 // on legacy Bsd implementations (which are no longer supported).
464 // Eventually, all the library path setting will be done here.
465 //
466 // However, to prevent the proliferation of improperly built native
467 // libraries, the new path component /usr/java/packages is added here.
468 // Eventually, all the library path setting will be done here.
469 {
470 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
471 // should always exist (until the legacy problem cited above is
472 // addressed).
473 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
474 // can specify a directory inside an app wrapper
475 const char *l = ::getenv("JAVA_LIBRARY_PATH");
476 const char *l_colon = ":";
477 if (l == NULL) { l = ""; l_colon = ""; }
478
479 const char *v = ::getenv("DYLD_LIBRARY_PATH");
480 const char *v_colon = ":";
481 if (v == NULL) { v = ""; v_colon = ""; }
482
483 // Apple's Java6 has "." at the beginning of java.library.path.
484 // OpenJDK on Windows has "." at the end of java.library.path.
485 // OpenJDK on Linux and Solaris don't have "." in java.library.path
486 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
487 // "." is appended to the end of java.library.path. Yes, this
488 // could cause a change in behavior, but Apple's Java6 behavior
489 // can be achieved by putting "." at the beginning of the
490 // JAVA_LIBRARY_PATH environment variable.
491 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
492 strlen(v) + 1 + strlen(l) + 1 +
493 system_ext_size + 3,
494 mtInternal);
495 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
496 v, v_colon, l, l_colon, user_home_dir);
497 Arguments::set_library_path(ld_library_path);
498 FREE_C_HEAP_ARRAY(char, ld_library_path);
499 }
500
501 // Extensions directories.
502 //
503 // Note that the space for the colon and the trailing null are provided
504 // by the nulls included by the sizeof operator (so actually one byte more
505 // than necessary is allocated).
506 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
507 user_home_dir, Arguments::get_java_home());
508 Arguments::set_ext_dirs(buf);
509
510 FREE_C_HEAP_ARRAY(char, buf);
511
512 #undef SYS_EXTENSIONS_DIR
513 #undef SYS_EXTENSIONS_DIRS
514
515 #endif // __APPLE__
516
517 #undef SYS_EXT_DIR
518 #undef EXTENSIONS_DIR
519 }
520
521 ////////////////////////////////////////////////////////////////////////////////
522 // breakpoint support
523
524 void os::breakpoint() {
525 BREAKPOINT;
526 }
527
528 extern "C" void breakpoint() {
529 // use debugger to set breakpoint here
530 }
531
532 ////////////////////////////////////////////////////////////////////////////////
533 // signal support
534
535 debug_only(static bool signal_sets_initialized = false);
536 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
537
538 bool os::Bsd::is_sig_ignored(int sig) {
539 struct sigaction oact;
540 sigaction(sig, (struct sigaction*)NULL, &oact);
541 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
542 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
543 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
544 return true;
545 } else {
546 return false;
547 }
548 }
549
550 void os::Bsd::signal_sets_init() {
551 // Should also have an assertion stating we are still single-threaded.
552 assert(!signal_sets_initialized, "Already initialized");
553 // Fill in signals that are necessarily unblocked for all threads in
554 // the VM. Currently, we unblock the following signals:
555 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
556 // by -Xrs (=ReduceSignalUsage));
557 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
558 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
559 // the dispositions or masks wrt these signals.
560 // Programs embedding the VM that want to use the above signals for their
561 // own purposes must, at this time, use the "-Xrs" option to prevent
562 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
563 // (See bug 4345157, and other related bugs).
564 // In reality, though, unblocking these signals is really a nop, since
565 // these signals are not blocked by default.
566 sigemptyset(&unblocked_sigs);
567 sigemptyset(&allowdebug_blocked_sigs);
568 sigaddset(&unblocked_sigs, SIGILL);
569 sigaddset(&unblocked_sigs, SIGSEGV);
570 sigaddset(&unblocked_sigs, SIGBUS);
571 sigaddset(&unblocked_sigs, SIGFPE);
572 sigaddset(&unblocked_sigs, SR_signum);
573
574 if (!ReduceSignalUsage) {
575 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
576 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
577 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
578 }
579 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
580 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
581 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
582 }
583 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
584 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
585 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
586 }
587 }
588 // Fill in signals that are blocked by all but the VM thread.
589 sigemptyset(&vm_sigs);
590 if (!ReduceSignalUsage) {
591 sigaddset(&vm_sigs, BREAK_SIGNAL);
592 }
593 debug_only(signal_sets_initialized = true);
594
595 }
596
597 // These are signals that are unblocked while a thread is running Java.
598 // (For some reason, they get blocked by default.)
599 sigset_t* os::Bsd::unblocked_signals() {
600 assert(signal_sets_initialized, "Not initialized");
601 return &unblocked_sigs;
602 }
603
604 // These are the signals that are blocked while a (non-VM) thread is
605 // running Java. Only the VM thread handles these signals.
606 sigset_t* os::Bsd::vm_signals() {
607 assert(signal_sets_initialized, "Not initialized");
608 return &vm_sigs;
609 }
610
611 // These are signals that are blocked during cond_wait to allow debugger in
612 sigset_t* os::Bsd::allowdebug_blocked_signals() {
613 assert(signal_sets_initialized, "Not initialized");
614 return &allowdebug_blocked_sigs;
615 }
616
617 void os::Bsd::hotspot_sigmask(Thread* thread) {
618
619 //Save caller's signal mask before setting VM signal mask
620 sigset_t caller_sigmask;
621 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
622
623 OSThread* osthread = thread->osthread();
624 osthread->set_caller_sigmask(caller_sigmask);
625
626 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
627
628 if (!ReduceSignalUsage) {
629 if (thread->is_VM_thread()) {
630 // Only the VM thread handles BREAK_SIGNAL ...
631 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
632 } else {
633 // ... all other threads block BREAK_SIGNAL
634 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
635 }
636 }
637 }
638
639
640 //////////////////////////////////////////////////////////////////////////////
641 // create new thread
642
643 #ifdef __APPLE__
644 // library handle for calling objc_registerThreadWithCollector()
645 // without static linking to the libobjc library
646 #define OBJC_LIB "/usr/lib/libobjc.dylib"
647 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
648 typedef void (*objc_registerThreadWithCollector_t)();
649 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
650 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
651 #endif
652
653 #ifdef __APPLE__
654 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
655 // Additional thread_id used to correlate threads in SA
656 thread_identifier_info_data_t m_ident_info;
657 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
658
659 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
660 (thread_info_t) &m_ident_info, &count);
661
662 return m_ident_info.thread_id;
663 }
664 #endif
665
666 // Thread start routine for all newly created threads
667 static void *java_start(Thread *thread) {
668 // Try to randomize the cache line index of hot stack frames.
669 // This helps when threads of the same stack traces evict each other's
670 // cache lines. The threads can be either from the same JVM instance, or
671 // from different JVM instances. The benefit is especially true for
672 // processors with hyperthreading technology.
673 static int counter = 0;
674 int pid = os::current_process_id();
675 alloca(((pid ^ counter++) & 7) * 128);
676
677 thread->initialize_thread_current();
678
679 OSThread* osthread = thread->osthread();
680 Monitor* sync = osthread->startThread_lock();
681
682 osthread->set_thread_id(os::Bsd::gettid());
683
684 #ifdef __APPLE__
685 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
686 guarantee(unique_thread_id != 0, "unique thread id was not found");
687 osthread->set_unique_thread_id(unique_thread_id);
688 #endif
689 // initialize signal mask for this thread
690 os::Bsd::hotspot_sigmask(thread);
691
692 // initialize floating point control register
693 os::Bsd::init_thread_fpu_state();
694
695 #ifdef __APPLE__
696 // register thread with objc gc
697 if (objc_registerThreadWithCollectorFunction != NULL) {
698 objc_registerThreadWithCollectorFunction();
699 }
700 #endif
701
702 // handshaking with parent thread
703 {
704 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
705
706 // notify parent thread
707 osthread->set_state(INITIALIZED);
708 sync->notify_all();
709
710 // wait until os::start_thread()
711 while (osthread->get_state() == INITIALIZED) {
712 sync->wait(Mutex::_no_safepoint_check_flag);
713 }
714 }
715
716 // call one more level start routine
717 thread->run();
718
719 return 0;
720 }
721
722 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
723 assert(thread->osthread() == NULL, "caller responsible");
724
725 // Allocate the OSThread object
726 OSThread* osthread = new OSThread(NULL, NULL);
727 if (osthread == NULL) {
728 return false;
729 }
730
731 // set the correct thread state
732 osthread->set_thread_type(thr_type);
733
734 // Initial state is ALLOCATED but not INITIALIZED
735 osthread->set_state(ALLOCATED);
736
737 thread->set_osthread(osthread);
738
739 // init thread attributes
740 pthread_attr_t attr;
741 pthread_attr_init(&attr);
742 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
743
744 // calculate stack size if it's not specified by caller
745 if (stack_size == 0) {
746 stack_size = os::Bsd::default_stack_size(thr_type);
747
748 switch (thr_type) {
749 case os::java_thread:
750 // Java threads use ThreadStackSize which default value can be
751 // changed with the flag -Xss
752 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
753 stack_size = JavaThread::stack_size_at_create();
754 break;
755 case os::compiler_thread:
756 if (CompilerThreadStackSize > 0) {
757 stack_size = (size_t)(CompilerThreadStackSize * K);
758 break;
759 } // else fall through:
760 // use VMThreadStackSize if CompilerThreadStackSize is not defined
761 case os::vm_thread:
762 case os::pgc_thread:
763 case os::cgc_thread:
764 case os::watcher_thread:
765 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
766 break;
767 }
768 }
769
770 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
771 pthread_attr_setstacksize(&attr, stack_size);
772
773 ThreadState state;
774
775 {
776 pthread_t tid;
777 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
778
779 pthread_attr_destroy(&attr);
780
781 if (ret != 0) {
782 if (PrintMiscellaneous && (Verbose || WizardMode)) {
783 perror("pthread_create()");
784 }
785 // Need to clean up stuff we've allocated so far
786 thread->set_osthread(NULL);
787 delete osthread;
788 return false;
789 }
790
791 // Store pthread info into the OSThread
792 osthread->set_pthread_id(tid);
793
794 // Wait until child thread is either initialized or aborted
795 {
796 Monitor* sync_with_child = osthread->startThread_lock();
797 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
798 while ((state = osthread->get_state()) == ALLOCATED) {
799 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
800 }
801 }
802
803 }
804
805 // Aborted due to thread limit being reached
806 if (state == ZOMBIE) {
807 thread->set_osthread(NULL);
808 delete osthread;
809 return false;
810 }
811
812 // The thread is returned suspended (in state INITIALIZED),
813 // and is started higher up in the call chain
814 assert(state == INITIALIZED, "race condition");
815 return true;
816 }
817
818 /////////////////////////////////////////////////////////////////////////////
819 // attach existing thread
820
821 // bootstrap the main thread
822 bool os::create_main_thread(JavaThread* thread) {
823 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
824 return create_attached_thread(thread);
825 }
826
827 bool os::create_attached_thread(JavaThread* thread) {
828 #ifdef ASSERT
829 thread->verify_not_published();
830 #endif
831
832 // Allocate the OSThread object
833 OSThread* osthread = new OSThread(NULL, NULL);
834
835 if (osthread == NULL) {
836 return false;
837 }
838
839 osthread->set_thread_id(os::Bsd::gettid());
840
841 // Store pthread info into the OSThread
842 #ifdef __APPLE__
843 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
844 guarantee(unique_thread_id != 0, "just checking");
845 osthread->set_unique_thread_id(unique_thread_id);
846 #endif
847 osthread->set_pthread_id(::pthread_self());
848
849 // initialize floating point control register
850 os::Bsd::init_thread_fpu_state();
851
852 // Initial thread state is RUNNABLE
853 osthread->set_state(RUNNABLE);
854
855 thread->set_osthread(osthread);
856
857 // initialize signal mask for this thread
858 // and save the caller's signal mask
859 os::Bsd::hotspot_sigmask(thread);
860
861 return true;
862 }
863
864 void os::pd_start_thread(Thread* thread) {
865 OSThread * osthread = thread->osthread();
866 assert(osthread->get_state() != INITIALIZED, "just checking");
867 Monitor* sync_with_child = osthread->startThread_lock();
868 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
869 sync_with_child->notify();
870 }
871
872 // Free Bsd resources related to the OSThread
873 void os::free_thread(OSThread* osthread) {
874 assert(osthread != NULL, "osthread not set");
875
876 if (Thread::current()->osthread() == osthread) {
877 // Restore caller's signal mask
878 sigset_t sigmask = osthread->caller_sigmask();
879 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
880 }
881
882 delete osthread;
883 }
884
885 ////////////////////////////////////////////////////////////////////////////////
886 // time support
887
888 // Time since start-up in seconds to a fine granularity.
889 // Used by VMSelfDestructTimer and the MemProfiler.
890 double os::elapsedTime() {
891
892 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
893 }
894
895 jlong os::elapsed_counter() {
896 return javaTimeNanos() - initial_time_count;
897 }
898
899 jlong os::elapsed_frequency() {
900 return NANOSECS_PER_SEC; // nanosecond resolution
901 }
902
903 bool os::supports_vtime() { return true; }
904 bool os::enable_vtime() { return false; }
905 bool os::vtime_enabled() { return false; }
906
907 double os::elapsedVTime() {
908 // better than nothing, but not much
909 return elapsedTime();
910 }
911
912 jlong os::javaTimeMillis() {
913 timeval time;
914 int status = gettimeofday(&time, NULL);
915 assert(status != -1, "bsd error");
916 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
917 }
918
919 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
920 timeval time;
921 int status = gettimeofday(&time, NULL);
922 assert(status != -1, "bsd error");
923 seconds = jlong(time.tv_sec);
924 nanos = jlong(time.tv_usec) * 1000;
925 }
926
927 #ifndef __APPLE__
928 #ifndef CLOCK_MONOTONIC
929 #define CLOCK_MONOTONIC (1)
930 #endif
931 #endif
932
933 #ifdef __APPLE__
934 void os::Bsd::clock_init() {
935 mach_timebase_info(&_timebase_info);
936 }
937 #else
938 void os::Bsd::clock_init() {
939 struct timespec res;
940 struct timespec tp;
941 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
942 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
943 // yes, monotonic clock is supported
944 _clock_gettime = ::clock_gettime;
945 }
946 }
947 #endif
948
949
950
951 #ifdef __APPLE__
952
953 jlong os::javaTimeNanos() {
954 const uint64_t tm = mach_absolute_time();
955 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
956 const uint64_t prev = Bsd::_max_abstime;
957 if (now <= prev) {
958 return prev; // same or retrograde time;
959 }
960 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev);
961 assert(obsv >= prev, "invariant"); // Monotonicity
962 // If the CAS succeeded then we're done and return "now".
963 // If the CAS failed and the observed value "obsv" is >= now then
964 // we should return "obsv". If the CAS failed and now > obsv > prv then
965 // some other thread raced this thread and installed a new value, in which case
966 // we could either (a) retry the entire operation, (b) retry trying to install now
967 // or (c) just return obsv. We use (c). No loop is required although in some cases
968 // we might discard a higher "now" value in deference to a slightly lower but freshly
969 // installed obsv value. That's entirely benign -- it admits no new orderings compared
970 // to (a) or (b) -- and greatly reduces coherence traffic.
971 // We might also condition (c) on the magnitude of the delta between obsv and now.
972 // Avoiding excessive CAS operations to hot RW locations is critical.
973 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
974 return (prev == obsv) ? now : obsv;
975 }
976
977 #else // __APPLE__
978
979 jlong os::javaTimeNanos() {
980 if (os::supports_monotonic_clock()) {
981 struct timespec tp;
982 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
983 assert(status == 0, "gettime error");
984 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
985 return result;
986 } else {
987 timeval time;
988 int status = gettimeofday(&time, NULL);
989 assert(status != -1, "bsd error");
990 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
991 return 1000 * usecs;
992 }
993 }
994
995 #endif // __APPLE__
996
997 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
998 if (os::supports_monotonic_clock()) {
999 info_ptr->max_value = ALL_64_BITS;
1000
1001 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1002 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1003 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1004 } else {
1005 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1006 info_ptr->max_value = ALL_64_BITS;
1007
1008 // gettimeofday is a real time clock so it skips
1009 info_ptr->may_skip_backward = true;
1010 info_ptr->may_skip_forward = true;
1011 }
1012
1013 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1014 }
1015
1016 // Return the real, user, and system times in seconds from an
1017 // arbitrary fixed point in the past.
1018 bool os::getTimesSecs(double* process_real_time,
1019 double* process_user_time,
1020 double* process_system_time) {
1021 struct tms ticks;
1022 clock_t real_ticks = times(&ticks);
1023
1024 if (real_ticks == (clock_t) (-1)) {
1025 return false;
1026 } else {
1027 double ticks_per_second = (double) clock_tics_per_sec;
1028 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1029 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1030 *process_real_time = ((double) real_ticks) / ticks_per_second;
1031
1032 return true;
1033 }
1034 }
1035
1036
1037 char * os::local_time_string(char *buf, size_t buflen) {
1038 struct tm t;
1039 time_t long_time;
1040 time(&long_time);
1041 localtime_r(&long_time, &t);
1042 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1043 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1044 t.tm_hour, t.tm_min, t.tm_sec);
1045 return buf;
1046 }
1047
1048 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1049 return localtime_r(clock, res);
1050 }
1051
1052 ////////////////////////////////////////////////////////////////////////////////
1053 // runtime exit support
1054
1055 // Note: os::shutdown() might be called very early during initialization, or
1056 // called from signal handler. Before adding something to os::shutdown(), make
1057 // sure it is async-safe and can handle partially initialized VM.
1058 void os::shutdown() {
1059
1060 // allow PerfMemory to attempt cleanup of any persistent resources
1061 perfMemory_exit();
1062
1063 // needs to remove object in file system
1064 AttachListener::abort();
1065
1066 // flush buffered output, finish log files
1067 ostream_abort();
1068
1069 // Check for abort hook
1070 abort_hook_t abort_hook = Arguments::abort_hook();
1071 if (abort_hook != NULL) {
1072 abort_hook();
1073 }
1074
1075 }
1076
1077 // Note: os::abort() might be called very early during initialization, or
1078 // called from signal handler. Before adding something to os::abort(), make
1079 // sure it is async-safe and can handle partially initialized VM.
1080 void os::abort(bool dump_core, void* siginfo, const void* context) {
1081 os::shutdown();
1082 if (dump_core) {
1083 #ifndef PRODUCT
1084 fdStream out(defaultStream::output_fd());
1085 out.print_raw("Current thread is ");
1086 char buf[16];
1087 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1088 out.print_raw_cr(buf);
1089 out.print_raw_cr("Dumping core ...");
1090 #endif
1091 ::abort(); // dump core
1092 }
1093
1094 ::exit(1);
1095 }
1096
1097 // Die immediately, no exit hook, no abort hook, no cleanup.
1098 void os::die() {
1099 // _exit() on BsdThreads only kills current thread
1100 ::abort();
1101 }
1102
1103 // This method is a copy of JDK's sysGetLastErrorString
1104 // from src/solaris/hpi/src/system_md.c
1105
1106 size_t os::lasterror(char *buf, size_t len) {
1107 if (errno == 0) return 0;
1108
1109 const char *s = ::strerror(errno);
1110 size_t n = ::strlen(s);
1111 if (n >= len) {
1112 n = len - 1;
1113 }
1114 ::strncpy(buf, s, n);
1115 buf[n] = '\0';
1116 return n;
1117 }
1118
1119 // Information of current thread in variety of formats
1120 pid_t os::Bsd::gettid() {
1121 int retval = -1;
1122
1123 #ifdef __APPLE__ //XNU kernel
1124 // despite the fact mach port is actually not a thread id use it
1125 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1126 retval = ::pthread_mach_thread_np(::pthread_self());
1127 guarantee(retval != 0, "just checking");
1128 return retval;
1129
1130 #else
1131 #ifdef __FreeBSD__
1132 retval = syscall(SYS_thr_self);
1133 #else
1134 #ifdef __OpenBSD__
1135 retval = syscall(SYS_getthrid);
1136 #else
1137 #ifdef __NetBSD__
1138 retval = (pid_t) syscall(SYS__lwp_self);
1139 #endif
1140 #endif
1141 #endif
1142 #endif
1143
1144 if (retval == -1) {
1145 return getpid();
1146 }
1147 }
1148
1149 intx os::current_thread_id() {
1150 #ifdef __APPLE__
1151 return (intx)::pthread_mach_thread_np(::pthread_self());
1152 #else
1153 return (intx)::pthread_self();
1154 #endif
1155 }
1156
1157 int os::current_process_id() {
1158
1159 // Under the old bsd thread library, bsd gives each thread
1160 // its own process id. Because of this each thread will return
1161 // a different pid if this method were to return the result
1162 // of getpid(2). Bsd provides no api that returns the pid
1163 // of the launcher thread for the vm. This implementation
1164 // returns a unique pid, the pid of the launcher thread
1165 // that starts the vm 'process'.
1166
1167 // Under the NPTL, getpid() returns the same pid as the
1168 // launcher thread rather than a unique pid per thread.
1169 // Use gettid() if you want the old pre NPTL behaviour.
1170
1171 // if you are looking for the result of a call to getpid() that
1172 // returns a unique pid for the calling thread, then look at the
1173 // OSThread::thread_id() method in osThread_bsd.hpp file
1174
1175 return (int)(_initial_pid ? _initial_pid : getpid());
1176 }
1177
1178 // DLL functions
1179
1180 #define JNI_LIB_PREFIX "lib"
1181 #ifdef __APPLE__
1182 #define JNI_LIB_SUFFIX ".dylib"
1183 #else
1184 #define JNI_LIB_SUFFIX ".so"
1185 #endif
1186
1187 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1188
1189 // This must be hard coded because it's the system's temporary
1190 // directory not the java application's temp directory, ala java.io.tmpdir.
1191 #ifdef __APPLE__
1192 // macosx has a secure per-user temporary directory
1193 char temp_path_storage[PATH_MAX];
1194 const char* os::get_temp_directory() {
1195 static char *temp_path = NULL;
1196 if (temp_path == NULL) {
1197 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1198 if (pathSize == 0 || pathSize > PATH_MAX) {
1199 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1200 }
1201 temp_path = temp_path_storage;
1202 }
1203 return temp_path;
1204 }
1205 #else // __APPLE__
1206 const char* os::get_temp_directory() { return "/tmp"; }
1207 #endif // __APPLE__
1208
1209 static bool file_exists(const char* filename) {
1210 struct stat statbuf;
1211 if (filename == NULL || strlen(filename) == 0) {
1212 return false;
1213 }
1214 return os::stat(filename, &statbuf) == 0;
1215 }
1216
1217 bool os::dll_build_name(char* buffer, size_t buflen,
1218 const char* pname, const char* fname) {
1219 bool retval = false;
1220 // Copied from libhpi
1221 const size_t pnamelen = pname ? strlen(pname) : 0;
1222
1223 // Return error on buffer overflow.
1224 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1225 return retval;
1226 }
1227
1228 if (pnamelen == 0) {
1229 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1230 retval = true;
1231 } else if (strchr(pname, *os::path_separator()) != NULL) {
1232 int n;
1233 char** pelements = split_path(pname, &n);
1234 if (pelements == NULL) {
1235 return false;
1236 }
1237 for (int i = 0; i < n; i++) {
1238 // Really shouldn't be NULL, but check can't hurt
1239 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1240 continue; // skip the empty path values
1241 }
1242 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1243 pelements[i], fname);
1244 if (file_exists(buffer)) {
1245 retval = true;
1246 break;
1247 }
1248 }
1249 // release the storage
1250 for (int i = 0; i < n; i++) {
1251 if (pelements[i] != NULL) {
1252 FREE_C_HEAP_ARRAY(char, pelements[i]);
1253 }
1254 }
1255 if (pelements != NULL) {
1256 FREE_C_HEAP_ARRAY(char*, pelements);
1257 }
1258 } else {
1259 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1260 retval = true;
1261 }
1262 return retval;
1263 }
1264
1265 // check if addr is inside libjvm.so
1266 bool os::address_is_in_vm(address addr) {
1267 static address libjvm_base_addr;
1268 Dl_info dlinfo;
1269
1270 if (libjvm_base_addr == NULL) {
1271 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1272 libjvm_base_addr = (address)dlinfo.dli_fbase;
1273 }
1274 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1275 }
1276
1277 if (dladdr((void *)addr, &dlinfo) != 0) {
1278 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1279 }
1280
1281 return false;
1282 }
1283
1284
1285 #define MACH_MAXSYMLEN 256
1286
1287 bool os::dll_address_to_function_name(address addr, char *buf,
1288 int buflen, int *offset,
1289 bool demangle) {
1290 // buf is not optional, but offset is optional
1291 assert(buf != NULL, "sanity check");
1292
1293 Dl_info dlinfo;
1294 char localbuf[MACH_MAXSYMLEN];
1295
1296 if (dladdr((void*)addr, &dlinfo) != 0) {
1297 // see if we have a matching symbol
1298 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1299 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1300 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1301 }
1302 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1303 return true;
1304 }
1305 // no matching symbol so try for just file info
1306 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1307 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1308 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1309 return true;
1310 }
1311 }
1312
1313 // Handle non-dynamic manually:
1314 if (dlinfo.dli_fbase != NULL &&
1315 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1316 dlinfo.dli_fbase)) {
1317 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1318 jio_snprintf(buf, buflen, "%s", localbuf);
1319 }
1320 return true;
1321 }
1322 }
1323 buf[0] = '\0';
1324 if (offset != NULL) *offset = -1;
1325 return false;
1326 }
1327
1328 // ported from solaris version
1329 bool os::dll_address_to_library_name(address addr, char* buf,
1330 int buflen, int* offset) {
1331 // buf is not optional, but offset is optional
1332 assert(buf != NULL, "sanity check");
1333
1334 Dl_info dlinfo;
1335
1336 if (dladdr((void*)addr, &dlinfo) != 0) {
1337 if (dlinfo.dli_fname != NULL) {
1338 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1339 }
1340 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1341 *offset = addr - (address)dlinfo.dli_fbase;
1342 }
1343 return true;
1344 }
1345
1346 buf[0] = '\0';
1347 if (offset) *offset = -1;
1348 return false;
1349 }
1350
1351 // Loads .dll/.so and
1352 // in case of error it checks if .dll/.so was built for the
1353 // same architecture as Hotspot is running on
1354
1355 #ifdef __APPLE__
1356 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1357 #ifdef STATIC_BUILD
1358 return os::get_default_process_handle();
1359 #else
1360 void * result= ::dlopen(filename, RTLD_LAZY);
1361 if (result != NULL) {
1362 // Successful loading
1363 return result;
1364 }
1365
1366 // Read system error message into ebuf
1367 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1368 ebuf[ebuflen-1]='\0';
1369
1370 return NULL;
1371 #endif // STATIC_BUILD
1372 }
1373 #else
1374 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1375 #ifdef STATIC_BUILD
1376 return os::get_default_process_handle();
1377 #else
1378 void * result= ::dlopen(filename, RTLD_LAZY);
1379 if (result != NULL) {
1380 // Successful loading
1381 return result;
1382 }
1383
1384 Elf32_Ehdr elf_head;
1385
1386 // Read system error message into ebuf
1387 // It may or may not be overwritten below
1388 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1389 ebuf[ebuflen-1]='\0';
1390 int diag_msg_max_length=ebuflen-strlen(ebuf);
1391 char* diag_msg_buf=ebuf+strlen(ebuf);
1392
1393 if (diag_msg_max_length==0) {
1394 // No more space in ebuf for additional diagnostics message
1395 return NULL;
1396 }
1397
1398
1399 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1400
1401 if (file_descriptor < 0) {
1402 // Can't open library, report dlerror() message
1403 return NULL;
1404 }
1405
1406 bool failed_to_read_elf_head=
1407 (sizeof(elf_head)!=
1408 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1409
1410 ::close(file_descriptor);
1411 if (failed_to_read_elf_head) {
1412 // file i/o error - report dlerror() msg
1413 return NULL;
1414 }
1415
1416 typedef struct {
1417 Elf32_Half code; // Actual value as defined in elf.h
1418 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1419 char elf_class; // 32 or 64 bit
1420 char endianess; // MSB or LSB
1421 char* name; // String representation
1422 } arch_t;
1423
1424 #ifndef EM_486
1425 #define EM_486 6 /* Intel 80486 */
1426 #endif
1427
1428 #ifndef EM_MIPS_RS3_LE
1429 #define EM_MIPS_RS3_LE 10 /* MIPS */
1430 #endif
1431
1432 #ifndef EM_PPC64
1433 #define EM_PPC64 21 /* PowerPC64 */
1434 #endif
1435
1436 #ifndef EM_S390
1437 #define EM_S390 22 /* IBM System/390 */
1438 #endif
1439
1440 #ifndef EM_IA_64
1441 #define EM_IA_64 50 /* HP/Intel IA-64 */
1442 #endif
1443
1444 #ifndef EM_X86_64
1445 #define EM_X86_64 62 /* AMD x86-64 */
1446 #endif
1447
1448 static const arch_t arch_array[]={
1449 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1450 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1451 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1452 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1453 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1454 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1455 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1456 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1457 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1458 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1459 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1460 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1461 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1462 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1463 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1464 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1465 };
1466
1467 #if (defined IA32)
1468 static Elf32_Half running_arch_code=EM_386;
1469 #elif (defined AMD64)
1470 static Elf32_Half running_arch_code=EM_X86_64;
1471 #elif (defined IA64)
1472 static Elf32_Half running_arch_code=EM_IA_64;
1473 #elif (defined __sparc) && (defined _LP64)
1474 static Elf32_Half running_arch_code=EM_SPARCV9;
1475 #elif (defined __sparc) && (!defined _LP64)
1476 static Elf32_Half running_arch_code=EM_SPARC;
1477 #elif (defined __powerpc64__)
1478 static Elf32_Half running_arch_code=EM_PPC64;
1479 #elif (defined __powerpc__)
1480 static Elf32_Half running_arch_code=EM_PPC;
1481 #elif (defined ARM)
1482 static Elf32_Half running_arch_code=EM_ARM;
1483 #elif (defined S390)
1484 static Elf32_Half running_arch_code=EM_S390;
1485 #elif (defined ALPHA)
1486 static Elf32_Half running_arch_code=EM_ALPHA;
1487 #elif (defined MIPSEL)
1488 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1489 #elif (defined PARISC)
1490 static Elf32_Half running_arch_code=EM_PARISC;
1491 #elif (defined MIPS)
1492 static Elf32_Half running_arch_code=EM_MIPS;
1493 #elif (defined M68K)
1494 static Elf32_Half running_arch_code=EM_68K;
1495 #else
1496 #error Method os::dll_load requires that one of following is defined:\
1497 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1498 #endif
1499
1500 // Identify compatability class for VM's architecture and library's architecture
1501 // Obtain string descriptions for architectures
1502
1503 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1504 int running_arch_index=-1;
1505
1506 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1507 if (running_arch_code == arch_array[i].code) {
1508 running_arch_index = i;
1509 }
1510 if (lib_arch.code == arch_array[i].code) {
1511 lib_arch.compat_class = arch_array[i].compat_class;
1512 lib_arch.name = arch_array[i].name;
1513 }
1514 }
1515
1516 assert(running_arch_index != -1,
1517 "Didn't find running architecture code (running_arch_code) in arch_array");
1518 if (running_arch_index == -1) {
1519 // Even though running architecture detection failed
1520 // we may still continue with reporting dlerror() message
1521 return NULL;
1522 }
1523
1524 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1525 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1526 return NULL;
1527 }
1528
1529 #ifndef S390
1530 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1531 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1532 return NULL;
1533 }
1534 #endif // !S390
1535
1536 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1537 if (lib_arch.name!=NULL) {
1538 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1539 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1540 lib_arch.name, arch_array[running_arch_index].name);
1541 } else {
1542 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1543 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1544 lib_arch.code,
1545 arch_array[running_arch_index].name);
1546 }
1547 }
1548
1549 return NULL;
1550 #endif // STATIC_BUILD
1551 }
1552 #endif // !__APPLE__
1553
1554 void* os::get_default_process_handle() {
1555 #ifdef __APPLE__
1556 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1557 // to avoid finding unexpected symbols on second (or later)
1558 // loads of a library.
1559 return (void*)::dlopen(NULL, RTLD_FIRST);
1560 #else
1561 return (void*)::dlopen(NULL, RTLD_LAZY);
1562 #endif
1563 }
1564
1565 // XXX: Do we need a lock around this as per Linux?
1566 void* os::dll_lookup(void* handle, const char* name) {
1567 return dlsym(handle, name);
1568 }
1569
1570 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1571 outputStream * out = (outputStream *) param;
1572 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1573 return 0;
1574 }
1575
1576 void os::print_dll_info(outputStream *st) {
1577 st->print_cr("Dynamic libraries:");
1578 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1579 st->print_cr("Error: Cannot print dynamic libraries.");
1580 }
1581 }
1582
1583 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1584 #ifdef RTLD_DI_LINKMAP
1585 Dl_info dli;
1586 void *handle;
1587 Link_map *map;
1588 Link_map *p;
1589
1590 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1591 dli.dli_fname == NULL) {
1592 return 1;
1593 }
1594 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1595 if (handle == NULL) {
1596 return 1;
1597 }
1598 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1599 if (map == NULL) {
1600 dlclose(handle);
1601 return 1;
1602 }
1603
1604 while (map->l_prev != NULL)
1605 map = map->l_prev;
1606
1607 while (map != NULL) {
1608 // Value for top_address is returned as 0 since we don't have any information about module size
1609 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1610 dlclose(handle);
1611 return 1;
1612 }
1613 map = map->l_next;
1614 }
1615
1616 dlclose(handle);
1617 #elif defined(__APPLE__)
1618 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1619 // Value for top_address is returned as 0 since we don't have any information about module size
1620 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1621 return 1;
1622 }
1623 }
1624 return 0;
1625 #else
1626 return 1;
1627 #endif
1628 }
1629
1630 void os::get_summary_os_info(char* buf, size_t buflen) {
1631 // These buffers are small because we want this to be brief
1632 // and not use a lot of stack while generating the hs_err file.
1633 char os[100];
1634 size_t size = sizeof(os);
1635 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1636 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1637 #ifdef __APPLE__
1638 strncpy(os, "Darwin", sizeof(os));
1639 #elif __OpenBSD__
1640 strncpy(os, "OpenBSD", sizeof(os));
1641 #else
1642 strncpy(os, "BSD", sizeof(os));
1643 #endif
1644 }
1645
1646 char release[100];
1647 size = sizeof(release);
1648 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1649 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1650 // if error, leave blank
1651 strncpy(release, "", sizeof(release));
1652 }
1653 snprintf(buf, buflen, "%s %s", os, release);
1654 }
1655
1656 void os::print_os_info_brief(outputStream* st) {
1657 os::Posix::print_uname_info(st);
1658 }
1659
1660 void os::print_os_info(outputStream* st) {
1661 st->print("OS:");
1662
1663 os::Posix::print_uname_info(st);
1664
1665 os::Posix::print_rlimit_info(st);
1666
1667 os::Posix::print_load_average(st);
1668 }
1669
1670 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1671 // Nothing to do for now.
1672 }
1673
1674 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1675 unsigned int mhz;
1676 size_t size = sizeof(mhz);
1677 int mib[] = { CTL_HW, HW_CPU_FREQ };
1678 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1679 mhz = 1; // looks like an error but can be divided by
1680 } else {
1681 mhz /= 1000000; // reported in millions
1682 }
1683
1684 char model[100];
1685 size = sizeof(model);
1686 int mib_model[] = { CTL_HW, HW_MODEL };
1687 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1688 strncpy(model, cpu_arch, sizeof(model));
1689 }
1690
1691 char machine[100];
1692 size = sizeof(machine);
1693 int mib_machine[] = { CTL_HW, HW_MACHINE };
1694 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1695 strncpy(machine, "", sizeof(machine));
1696 }
1697
1698 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1699 }
1700
1701 void os::print_memory_info(outputStream* st) {
1702
1703 st->print("Memory:");
1704 st->print(" %dk page", os::vm_page_size()>>10);
1705
1706 st->print(", physical " UINT64_FORMAT "k",
1707 os::physical_memory() >> 10);
1708 st->print("(" UINT64_FORMAT "k free)",
1709 os::available_memory() >> 10);
1710 st->cr();
1711 }
1712
1713 static void print_signal_handler(outputStream* st, int sig,
1714 char* buf, size_t buflen);
1715
1716 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1717 st->print_cr("Signal Handlers:");
1718 print_signal_handler(st, SIGSEGV, buf, buflen);
1719 print_signal_handler(st, SIGBUS , buf, buflen);
1720 print_signal_handler(st, SIGFPE , buf, buflen);
1721 print_signal_handler(st, SIGPIPE, buf, buflen);
1722 print_signal_handler(st, SIGXFSZ, buf, buflen);
1723 print_signal_handler(st, SIGILL , buf, buflen);
1724 print_signal_handler(st, SR_signum, buf, buflen);
1725 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1726 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1727 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1728 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1729 }
1730
1731 static char saved_jvm_path[MAXPATHLEN] = {0};
1732
1733 // Find the full path to the current module, libjvm
1734 void os::jvm_path(char *buf, jint buflen) {
1735 // Error checking.
1736 if (buflen < MAXPATHLEN) {
1737 assert(false, "must use a large-enough buffer");
1738 buf[0] = '\0';
1739 return;
1740 }
1741 // Lazy resolve the path to current module.
1742 if (saved_jvm_path[0] != 0) {
1743 strcpy(buf, saved_jvm_path);
1744 return;
1745 }
1746
1747 char dli_fname[MAXPATHLEN];
1748 bool ret = dll_address_to_library_name(
1749 CAST_FROM_FN_PTR(address, os::jvm_path),
1750 dli_fname, sizeof(dli_fname), NULL);
1751 assert(ret, "cannot locate libjvm");
1752 char *rp = NULL;
1753 if (ret && dli_fname[0] != '\0') {
1754 rp = realpath(dli_fname, buf);
1755 }
1756 if (rp == NULL) {
1757 return;
1758 }
1759
1760 if (Arguments::sun_java_launcher_is_altjvm()) {
1761 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1762 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1763 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1764 // appears at the right place in the string, then assume we are
1765 // installed in a JDK and we're done. Otherwise, check for a
1766 // JAVA_HOME environment variable and construct a path to the JVM
1767 // being overridden.
1768
1769 const char *p = buf + strlen(buf) - 1;
1770 for (int count = 0; p > buf && count < 5; ++count) {
1771 for (--p; p > buf && *p != '/'; --p)
1772 /* empty */ ;
1773 }
1774
1775 if (strncmp(p, "/jre/lib/", 9) != 0) {
1776 // Look for JAVA_HOME in the environment.
1777 char* java_home_var = ::getenv("JAVA_HOME");
1778 if (java_home_var != NULL && java_home_var[0] != 0) {
1779 char* jrelib_p;
1780 int len;
1781
1782 // Check the current module name "libjvm"
1783 p = strrchr(buf, '/');
1784 assert(strstr(p, "/libjvm") == p, "invalid library name");
1785
1786 rp = realpath(java_home_var, buf);
1787 if (rp == NULL) {
1788 return;
1789 }
1790
1791 // determine if this is a legacy image or modules image
1792 // modules image doesn't have "jre" subdirectory
1793 len = strlen(buf);
1794 assert(len < buflen, "Ran out of buffer space");
1795 jrelib_p = buf + len;
1796
1797 // Add the appropriate library subdir
1798 snprintf(jrelib_p, buflen-len, "/jre/lib");
1799 if (0 != access(buf, F_OK)) {
1800 snprintf(jrelib_p, buflen-len, "/lib");
1801 }
1802
1803 // Add the appropriate client or server subdir
1804 len = strlen(buf);
1805 jrelib_p = buf + len;
1806 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1807 if (0 != access(buf, F_OK)) {
1808 snprintf(jrelib_p, buflen-len, "%s", "");
1809 }
1810
1811 // If the path exists within JAVA_HOME, add the JVM library name
1812 // to complete the path to JVM being overridden. Otherwise fallback
1813 // to the path to the current library.
1814 if (0 == access(buf, F_OK)) {
1815 // Use current module name "libjvm"
1816 len = strlen(buf);
1817 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1818 } else {
1819 // Fall back to path of current library
1820 rp = realpath(dli_fname, buf);
1821 if (rp == NULL) {
1822 return;
1823 }
1824 }
1825 }
1826 }
1827 }
1828
1829 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1830 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1831 }
1832
1833 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1834 // no prefix required, not even "_"
1835 }
1836
1837 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1838 // no suffix required
1839 }
1840
1841 ////////////////////////////////////////////////////////////////////////////////
1842 // sun.misc.Signal support
1843
1844 static volatile jint sigint_count = 0;
1845
1846 static void UserHandler(int sig, void *siginfo, void *context) {
1847 // 4511530 - sem_post is serialized and handled by the manager thread. When
1848 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1849 // don't want to flood the manager thread with sem_post requests.
1850 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1851 return;
1852 }
1853
1854 // Ctrl-C is pressed during error reporting, likely because the error
1855 // handler fails to abort. Let VM die immediately.
1856 if (sig == SIGINT && is_error_reported()) {
1857 os::die();
1858 }
1859
1860 os::signal_notify(sig);
1861 }
1862
1863 void* os::user_handler() {
1864 return CAST_FROM_FN_PTR(void*, UserHandler);
1865 }
1866
1867 extern "C" {
1868 typedef void (*sa_handler_t)(int);
1869 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1870 }
1871
1872 void* os::signal(int signal_number, void* handler) {
1873 struct sigaction sigAct, oldSigAct;
1874
1875 sigfillset(&(sigAct.sa_mask));
1876 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1877 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1878
1879 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1880 // -1 means registration failed
1881 return (void *)-1;
1882 }
1883
1884 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1885 }
1886
1887 void os::signal_raise(int signal_number) {
1888 ::raise(signal_number);
1889 }
1890
1891 // The following code is moved from os.cpp for making this
1892 // code platform specific, which it is by its very nature.
1893
1894 // Will be modified when max signal is changed to be dynamic
1895 int os::sigexitnum_pd() {
1896 return NSIG;
1897 }
1898
1899 // a counter for each possible signal value
1900 static volatile jint pending_signals[NSIG+1] = { 0 };
1901
1902 // Bsd(POSIX) specific hand shaking semaphore.
1903 #ifdef __APPLE__
1904 typedef semaphore_t os_semaphore_t;
1905
1906 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1907 #define SEM_WAIT(sem) semaphore_wait(sem)
1908 #define SEM_POST(sem) semaphore_signal(sem)
1909 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1910 #else
1911 typedef sem_t os_semaphore_t;
1912
1913 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1914 #define SEM_WAIT(sem) sem_wait(&sem)
1915 #define SEM_POST(sem) sem_post(&sem)
1916 #define SEM_DESTROY(sem) sem_destroy(&sem)
1917 #endif
1918
1919 #ifdef __APPLE__
1920 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
1921
1922 static const char* sem_init_strerror(kern_return_t value) {
1923 switch (value) {
1924 case KERN_INVALID_ARGUMENT: return "Invalid argument";
1925 case KERN_RESOURCE_SHORTAGE: return "Resource shortage";
1926 default: return "Unknown";
1927 }
1928 }
1929
1930 OSXSemaphore::OSXSemaphore(uint value) {
1931 kern_return_t ret = SEM_INIT(_semaphore, value);
1932
1933 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret));
1934 }
1935
1936 OSXSemaphore::~OSXSemaphore() {
1937 SEM_DESTROY(_semaphore);
1938 }
1939
1940 void OSXSemaphore::signal(uint count) {
1941 for (uint i = 0; i < count; i++) {
1942 kern_return_t ret = SEM_POST(_semaphore);
1943
1944 assert(ret == KERN_SUCCESS, "Failed to signal semaphore");
1945 }
1946 }
1947
1948 void OSXSemaphore::wait() {
1949 kern_return_t ret;
1950 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) {
1951 // Semaphore was interrupted. Retry.
1952 }
1953 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore");
1954 }
1955
1956 jlong OSXSemaphore::currenttime() {
1957 struct timeval tv;
1958 gettimeofday(&tv, NULL);
1959 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1960 }
1961
1962 bool OSXSemaphore::trywait() {
1963 return timedwait(0, 0);
1964 }
1965
1966 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) {
1967 kern_return_t kr = KERN_ABORTED;
1968 mach_timespec_t waitspec;
1969 waitspec.tv_sec = sec;
1970 waitspec.tv_nsec = nsec;
1971
1972 jlong starttime = currenttime();
1973
1974 kr = semaphore_timedwait(_semaphore, waitspec);
1975 while (kr == KERN_ABORTED) {
1976 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1977
1978 jlong current = currenttime();
1979 jlong passedtime = current - starttime;
1980
1981 if (passedtime >= totalwait) {
1982 waitspec.tv_sec = 0;
1983 waitspec.tv_nsec = 0;
1984 } else {
1985 jlong waittime = totalwait - (current - starttime);
1986 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
1987 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
1988 }
1989
1990 kr = semaphore_timedwait(_semaphore, waitspec);
1991 }
1992
1993 return kr == KERN_SUCCESS;
1994 }
1995
1996 #else
1997 // Use POSIX implementation of semaphores.
1998
1999 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2000 struct timespec ts;
2001 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2002
2003 return ts;
2004 }
2005
2006 #endif // __APPLE__
2007
2008 static os_semaphore_t sig_sem;
2009
2010 #ifdef __APPLE__
2011 static OSXSemaphore sr_semaphore;
2012 #else
2013 static PosixSemaphore sr_semaphore;
2014 #endif
2015
2016 void os::signal_init_pd() {
2017 // Initialize signal structures
2018 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2019
2020 // Initialize signal semaphore
2021 ::SEM_INIT(sig_sem, 0);
2022 }
2023
2024 void os::signal_notify(int sig) {
2025 Atomic::inc(&pending_signals[sig]);
2026 ::SEM_POST(sig_sem);
2027 }
2028
2029 static int check_pending_signals(bool wait) {
2030 Atomic::store(0, &sigint_count);
2031 for (;;) {
2032 for (int i = 0; i < NSIG + 1; i++) {
2033 jint n = pending_signals[i];
2034 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2035 return i;
2036 }
2037 }
2038 if (!wait) {
2039 return -1;
2040 }
2041 JavaThread *thread = JavaThread::current();
2042 ThreadBlockInVM tbivm(thread);
2043
2044 bool threadIsSuspended;
2045 do {
2046 thread->set_suspend_equivalent();
2047 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2048 ::SEM_WAIT(sig_sem);
2049
2050 // were we externally suspended while we were waiting?
2051 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2052 if (threadIsSuspended) {
2053 // The semaphore has been incremented, but while we were waiting
2054 // another thread suspended us. We don't want to continue running
2055 // while suspended because that would surprise the thread that
2056 // suspended us.
2057 ::SEM_POST(sig_sem);
2058
2059 thread->java_suspend_self();
2060 }
2061 } while (threadIsSuspended);
2062 }
2063 }
2064
2065 int os::signal_lookup() {
2066 return check_pending_signals(false);
2067 }
2068
2069 int os::signal_wait() {
2070 return check_pending_signals(true);
2071 }
2072
2073 ////////////////////////////////////////////////////////////////////////////////
2074 // Virtual Memory
2075
2076 int os::vm_page_size() {
2077 // Seems redundant as all get out
2078 assert(os::Bsd::page_size() != -1, "must call os::init");
2079 return os::Bsd::page_size();
2080 }
2081
2082 // Solaris allocates memory by pages.
2083 int os::vm_allocation_granularity() {
2084 assert(os::Bsd::page_size() != -1, "must call os::init");
2085 return os::Bsd::page_size();
2086 }
2087
2088 // Rationale behind this function:
2089 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2090 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2091 // samples for JITted code. Here we create private executable mapping over the code cache
2092 // and then we can use standard (well, almost, as mapping can change) way to provide
2093 // info for the reporting script by storing timestamp and location of symbol
2094 void bsd_wrap_code(char* base, size_t size) {
2095 static volatile jint cnt = 0;
2096
2097 if (!UseOprofile) {
2098 return;
2099 }
2100
2101 char buf[PATH_MAX + 1];
2102 int num = Atomic::add(1, &cnt);
2103
2104 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2105 os::get_temp_directory(), os::current_process_id(), num);
2106 unlink(buf);
2107
2108 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2109
2110 if (fd != -1) {
2111 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2112 if (rv != (off_t)-1) {
2113 if (::write(fd, "", 1) == 1) {
2114 mmap(base, size,
2115 PROT_READ|PROT_WRITE|PROT_EXEC,
2116 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2117 }
2118 }
2119 ::close(fd);
2120 unlink(buf);
2121 }
2122 }
2123
2124 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2125 int err) {
2126 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2127 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2128 strerror(err), err);
2129 }
2130
2131 // NOTE: Bsd kernel does not really reserve the pages for us.
2132 // All it does is to check if there are enough free pages
2133 // left at the time of mmap(). This could be a potential
2134 // problem.
2135 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2136 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2137 #ifdef __OpenBSD__
2138 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2139 if (::mprotect(addr, size, prot) == 0) {
2140 return true;
2141 }
2142 #else
2143 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2144 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2145 if (res != (uintptr_t) MAP_FAILED) {
2146 return true;
2147 }
2148 #endif
2149
2150 // Warn about any commit errors we see in non-product builds just
2151 // in case mmap() doesn't work as described on the man page.
2152 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2153
2154 return false;
2155 }
2156
2157 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2158 bool exec) {
2159 // alignment_hint is ignored on this OS
2160 return pd_commit_memory(addr, size, exec);
2161 }
2162
2163 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2164 const char* mesg) {
2165 assert(mesg != NULL, "mesg must be specified");
2166 if (!pd_commit_memory(addr, size, exec)) {
2167 // add extra info in product mode for vm_exit_out_of_memory():
2168 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2169 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2170 }
2171 }
2172
2173 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2174 size_t alignment_hint, bool exec,
2175 const char* mesg) {
2176 // alignment_hint is ignored on this OS
2177 pd_commit_memory_or_exit(addr, size, exec, mesg);
2178 }
2179
2180 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2181 }
2182
2183 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2184 ::madvise(addr, bytes, MADV_DONTNEED);
2185 }
2186
2187 void os::numa_make_global(char *addr, size_t bytes) {
2188 }
2189
2190 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2191 }
2192
2193 bool os::numa_topology_changed() { return false; }
2194
2195 size_t os::numa_get_groups_num() {
2196 return 1;
2197 }
2198
2199 int os::numa_get_group_id() {
2200 return 0;
2201 }
2202
2203 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2204 if (size > 0) {
2205 ids[0] = 0;
2206 return 1;
2207 }
2208 return 0;
2209 }
2210
2211 bool os::get_page_info(char *start, page_info* info) {
2212 return false;
2213 }
2214
2215 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2216 return end;
2217 }
2218
2219
2220 bool os::pd_uncommit_memory(char* addr, size_t size) {
2221 #ifdef __OpenBSD__
2222 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2223 return ::mprotect(addr, size, PROT_NONE) == 0;
2224 #else
2225 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2226 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2227 return res != (uintptr_t) MAP_FAILED;
2228 #endif
2229 }
2230
2231 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2232 return os::commit_memory(addr, size, !ExecMem);
2233 }
2234
2235 // If this is a growable mapping, remove the guard pages entirely by
2236 // munmap()ping them. If not, just call uncommit_memory().
2237 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2238 return os::uncommit_memory(addr, size);
2239 }
2240
2241 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2242 // at 'requested_addr'. If there are existing memory mappings at the same
2243 // location, however, they will be overwritten. If 'fixed' is false,
2244 // 'requested_addr' is only treated as a hint, the return value may or
2245 // may not start from the requested address. Unlike Bsd mmap(), this
2246 // function returns NULL to indicate failure.
2247 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2248 char * addr;
2249 int flags;
2250
2251 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2252 if (fixed) {
2253 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2254 flags |= MAP_FIXED;
2255 }
2256
2257 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2258 // touch an uncommitted page. Otherwise, the read/write might
2259 // succeed if we have enough swap space to back the physical page.
2260 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2261 flags, -1, 0);
2262
2263 return addr == MAP_FAILED ? NULL : addr;
2264 }
2265
2266 static int anon_munmap(char * addr, size_t size) {
2267 return ::munmap(addr, size) == 0;
2268 }
2269
2270 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2271 size_t alignment_hint) {
2272 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2273 }
2274
2275 bool os::pd_release_memory(char* addr, size_t size) {
2276 return anon_munmap(addr, size);
2277 }
2278
2279 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2280 // Bsd wants the mprotect address argument to be page aligned.
2281 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
2282
2283 // According to SUSv3, mprotect() should only be used with mappings
2284 // established by mmap(), and mmap() always maps whole pages. Unaligned
2285 // 'addr' likely indicates problem in the VM (e.g. trying to change
2286 // protection of malloc'ed or statically allocated memory). Check the
2287 // caller if you hit this assert.
2288 assert(addr == bottom, "sanity check");
2289
2290 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2291 return ::mprotect(bottom, size, prot) == 0;
2292 }
2293
2294 // Set protections specified
2295 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2296 bool is_committed) {
2297 unsigned int p = 0;
2298 switch (prot) {
2299 case MEM_PROT_NONE: p = PROT_NONE; break;
2300 case MEM_PROT_READ: p = PROT_READ; break;
2301 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2302 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2303 default:
2304 ShouldNotReachHere();
2305 }
2306 // is_committed is unused.
2307 return bsd_mprotect(addr, bytes, p);
2308 }
2309
2310 bool os::guard_memory(char* addr, size_t size) {
2311 return bsd_mprotect(addr, size, PROT_NONE);
2312 }
2313
2314 bool os::unguard_memory(char* addr, size_t size) {
2315 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2316 }
2317
2318 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2319 return false;
2320 }
2321
2322 // Large page support
2323
2324 static size_t _large_page_size = 0;
2325
2326 void os::large_page_init() {
2327 }
2328
2329
2330 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2331 fatal("This code is not used or maintained.");
2332
2333 // "exec" is passed in but not used. Creating the shared image for
2334 // the code cache doesn't have an SHM_X executable permission to check.
2335 assert(UseLargePages && UseSHM, "only for SHM large pages");
2336
2337 key_t key = IPC_PRIVATE;
2338 char *addr;
2339
2340 bool warn_on_failure = UseLargePages &&
2341 (!FLAG_IS_DEFAULT(UseLargePages) ||
2342 !FLAG_IS_DEFAULT(LargePageSizeInBytes));
2343
2344 // Create a large shared memory region to attach to based on size.
2345 // Currently, size is the total size of the heap
2346 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2347 if (shmid == -1) {
2348 // Possible reasons for shmget failure:
2349 // 1. shmmax is too small for Java heap.
2350 // > check shmmax value: cat /proc/sys/kernel/shmmax
2351 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2352 // 2. not enough large page memory.
2353 // > check available large pages: cat /proc/meminfo
2354 // > increase amount of large pages:
2355 // echo new_value > /proc/sys/vm/nr_hugepages
2356 // Note 1: different Bsd may use different name for this property,
2357 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2358 // Note 2: it's possible there's enough physical memory available but
2359 // they are so fragmented after a long run that they can't
2360 // coalesce into large pages. Try to reserve large pages when
2361 // the system is still "fresh".
2362 if (warn_on_failure) {
2363 warning("Failed to reserve shared memory (errno = %d).", errno);
2364 }
2365 return NULL;
2366 }
2367
2368 // attach to the region
2369 addr = (char*)shmat(shmid, req_addr, 0);
2370 int err = errno;
2371
2372 // Remove shmid. If shmat() is successful, the actual shared memory segment
2373 // will be deleted when it's detached by shmdt() or when the process
2374 // terminates. If shmat() is not successful this will remove the shared
2375 // segment immediately.
2376 shmctl(shmid, IPC_RMID, NULL);
2377
2378 if ((intptr_t)addr == -1) {
2379 if (warn_on_failure) {
2380 warning("Failed to attach shared memory (errno = %d).", err);
2381 }
2382 return NULL;
2383 }
2384
2385 // The memory is committed
2386 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
2387
2388 return addr;
2389 }
2390
2391 bool os::release_memory_special(char* base, size_t bytes) {
2392 if (MemTracker::tracking_level() > NMT_minimal) {
2393 Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
2394 // detaching the SHM segment will also delete it, see reserve_memory_special()
2395 int rslt = shmdt(base);
2396 if (rslt == 0) {
2397 tkr.record((address)base, bytes);
2398 return true;
2399 } else {
2400 return false;
2401 }
2402 } else {
2403 return shmdt(base) == 0;
2404 }
2405 }
2406
2407 size_t os::large_page_size() {
2408 return _large_page_size;
2409 }
2410
2411 // HugeTLBFS allows application to commit large page memory on demand;
2412 // with SysV SHM the entire memory region must be allocated as shared
2413 // memory.
2414 bool os::can_commit_large_page_memory() {
2415 return UseHugeTLBFS;
2416 }
2417
2418 bool os::can_execute_large_page_memory() {
2419 return UseHugeTLBFS;
2420 }
2421
2422 // Reserve memory at an arbitrary address, only if that area is
2423 // available (and not reserved for something else).
2424
2425 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2426 const int max_tries = 10;
2427 char* base[max_tries];
2428 size_t size[max_tries];
2429 const size_t gap = 0x000000;
2430
2431 // Assert only that the size is a multiple of the page size, since
2432 // that's all that mmap requires, and since that's all we really know
2433 // about at this low abstraction level. If we need higher alignment,
2434 // we can either pass an alignment to this method or verify alignment
2435 // in one of the methods further up the call chain. See bug 5044738.
2436 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2437
2438 // Repeatedly allocate blocks until the block is allocated at the
2439 // right spot.
2440
2441 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2442 // if kernel honors the hint then we can return immediately.
2443 char * addr = anon_mmap(requested_addr, bytes, false);
2444 if (addr == requested_addr) {
2445 return requested_addr;
2446 }
2447
2448 if (addr != NULL) {
2449 // mmap() is successful but it fails to reserve at the requested address
2450 anon_munmap(addr, bytes);
2451 }
2452
2453 int i;
2454 for (i = 0; i < max_tries; ++i) {
2455 base[i] = reserve_memory(bytes);
2456
2457 if (base[i] != NULL) {
2458 // Is this the block we wanted?
2459 if (base[i] == requested_addr) {
2460 size[i] = bytes;
2461 break;
2462 }
2463
2464 // Does this overlap the block we wanted? Give back the overlapped
2465 // parts and try again.
2466
2467 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2468 if (top_overlap >= 0 && top_overlap < bytes) {
2469 unmap_memory(base[i], top_overlap);
2470 base[i] += top_overlap;
2471 size[i] = bytes - top_overlap;
2472 } else {
2473 size_t bottom_overlap = base[i] + bytes - requested_addr;
2474 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2475 unmap_memory(requested_addr, bottom_overlap);
2476 size[i] = bytes - bottom_overlap;
2477 } else {
2478 size[i] = bytes;
2479 }
2480 }
2481 }
2482 }
2483
2484 // Give back the unused reserved pieces.
2485
2486 for (int j = 0; j < i; ++j) {
2487 if (base[j] != NULL) {
2488 unmap_memory(base[j], size[j]);
2489 }
2490 }
2491
2492 if (i < max_tries) {
2493 return requested_addr;
2494 } else {
2495 return NULL;
2496 }
2497 }
2498
2499 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2500 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2501 }
2502
2503 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2504 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2505 }
2506
2507 void os::naked_short_sleep(jlong ms) {
2508 struct timespec req;
2509
2510 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2511 req.tv_sec = 0;
2512 if (ms > 0) {
2513 req.tv_nsec = (ms % 1000) * 1000000;
2514 } else {
2515 req.tv_nsec = 1;
2516 }
2517
2518 nanosleep(&req, NULL);
2519
2520 return;
2521 }
2522
2523 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2524 void os::infinite_sleep() {
2525 while (true) { // sleep forever ...
2526 ::sleep(100); // ... 100 seconds at a time
2527 }
2528 }
2529
2530 // Used to convert frequent JVM_Yield() to nops
2531 bool os::dont_yield() {
2532 return DontYieldALot;
2533 }
2534
2535 void os::naked_yield() {
2536 sched_yield();
2537 }
2538
2539 ////////////////////////////////////////////////////////////////////////////////
2540 // thread priority support
2541
2542 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2543 // only supports dynamic priority, static priority must be zero. For real-time
2544 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2545 // However, for large multi-threaded applications, SCHED_RR is not only slower
2546 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2547 // of 5 runs - Sep 2005).
2548 //
2549 // The following code actually changes the niceness of kernel-thread/LWP. It
2550 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2551 // not the entire user process, and user level threads are 1:1 mapped to kernel
2552 // threads. It has always been the case, but could change in the future. For
2553 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2554 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2555
2556 #if !defined(__APPLE__)
2557 int os::java_to_os_priority[CriticalPriority + 1] = {
2558 19, // 0 Entry should never be used
2559
2560 0, // 1 MinPriority
2561 3, // 2
2562 6, // 3
2563
2564 10, // 4
2565 15, // 5 NormPriority
2566 18, // 6
2567
2568 21, // 7
2569 25, // 8
2570 28, // 9 NearMaxPriority
2571
2572 31, // 10 MaxPriority
2573
2574 31 // 11 CriticalPriority
2575 };
2576 #else
2577 // Using Mach high-level priority assignments
2578 int os::java_to_os_priority[CriticalPriority + 1] = {
2579 0, // 0 Entry should never be used (MINPRI_USER)
2580
2581 27, // 1 MinPriority
2582 28, // 2
2583 29, // 3
2584
2585 30, // 4
2586 31, // 5 NormPriority (BASEPRI_DEFAULT)
2587 32, // 6
2588
2589 33, // 7
2590 34, // 8
2591 35, // 9 NearMaxPriority
2592
2593 36, // 10 MaxPriority
2594
2595 36 // 11 CriticalPriority
2596 };
2597 #endif
2598
2599 static int prio_init() {
2600 if (ThreadPriorityPolicy == 1) {
2601 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2602 // if effective uid is not root. Perhaps, a more elegant way of doing
2603 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2604 if (geteuid() != 0) {
2605 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2606 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2607 }
2608 ThreadPriorityPolicy = 0;
2609 }
2610 }
2611 if (UseCriticalJavaThreadPriority) {
2612 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2613 }
2614 return 0;
2615 }
2616
2617 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2618 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2619
2620 #ifdef __OpenBSD__
2621 // OpenBSD pthread_setprio starves low priority threads
2622 return OS_OK;
2623 #elif defined(__FreeBSD__)
2624 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2625 #elif defined(__APPLE__) || defined(__NetBSD__)
2626 struct sched_param sp;
2627 int policy;
2628 pthread_t self = pthread_self();
2629
2630 if (pthread_getschedparam(self, &policy, &sp) != 0) {
2631 return OS_ERR;
2632 }
2633
2634 sp.sched_priority = newpri;
2635 if (pthread_setschedparam(self, policy, &sp) != 0) {
2636 return OS_ERR;
2637 }
2638
2639 return OS_OK;
2640 #else
2641 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2642 return (ret == 0) ? OS_OK : OS_ERR;
2643 #endif
2644 }
2645
2646 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2647 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2648 *priority_ptr = java_to_os_priority[NormPriority];
2649 return OS_OK;
2650 }
2651
2652 errno = 0;
2653 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2654 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2655 #elif defined(__APPLE__) || defined(__NetBSD__)
2656 int policy;
2657 struct sched_param sp;
2658
2659 pthread_getschedparam(pthread_self(), &policy, &sp);
2660 *priority_ptr = sp.sched_priority;
2661 #else
2662 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2663 #endif
2664 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2665 }
2666
2667 // Hint to the underlying OS that a task switch would not be good.
2668 // Void return because it's a hint and can fail.
2669 void os::hint_no_preempt() {}
2670
2671 ////////////////////////////////////////////////////////////////////////////////
2672 // suspend/resume support
2673
2674 // the low-level signal-based suspend/resume support is a remnant from the
2675 // old VM-suspension that used to be for java-suspension, safepoints etc,
2676 // within hotspot. Now there is a single use-case for this:
2677 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2678 // that runs in the watcher thread.
2679 // The remaining code is greatly simplified from the more general suspension
2680 // code that used to be used.
2681 //
2682 // The protocol is quite simple:
2683 // - suspend:
2684 // - sends a signal to the target thread
2685 // - polls the suspend state of the osthread using a yield loop
2686 // - target thread signal handler (SR_handler) sets suspend state
2687 // and blocks in sigsuspend until continued
2688 // - resume:
2689 // - sets target osthread state to continue
2690 // - sends signal to end the sigsuspend loop in the SR_handler
2691 //
2692 // Note that the SR_lock plays no role in this suspend/resume protocol.
2693
2694 static void resume_clear_context(OSThread *osthread) {
2695 osthread->set_ucontext(NULL);
2696 osthread->set_siginfo(NULL);
2697 }
2698
2699 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2700 osthread->set_ucontext(context);
2701 osthread->set_siginfo(siginfo);
2702 }
2703
2704 // Handler function invoked when a thread's execution is suspended or
2705 // resumed. We have to be careful that only async-safe functions are
2706 // called here (Note: most pthread functions are not async safe and
2707 // should be avoided.)
2708 //
2709 // Note: sigwait() is a more natural fit than sigsuspend() from an
2710 // interface point of view, but sigwait() prevents the signal hander
2711 // from being run. libpthread would get very confused by not having
2712 // its signal handlers run and prevents sigwait()'s use with the
2713 // mutex granting granting signal.
2714 //
2715 // Currently only ever called on the VMThread or JavaThread
2716 //
2717 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2718 // Save and restore errno to avoid confusing native code with EINTR
2719 // after sigsuspend.
2720 int old_errno = errno;
2721
2722 Thread* thread = Thread::current();
2723 OSThread* osthread = thread->osthread();
2724 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2725
2726 os::SuspendResume::State current = osthread->sr.state();
2727 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2728 suspend_save_context(osthread, siginfo, context);
2729
2730 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2731 os::SuspendResume::State state = osthread->sr.suspended();
2732 if (state == os::SuspendResume::SR_SUSPENDED) {
2733 sigset_t suspend_set; // signals for sigsuspend()
2734
2735 // get current set of blocked signals and unblock resume signal
2736 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2737 sigdelset(&suspend_set, SR_signum);
2738
2739 sr_semaphore.signal();
2740 // wait here until we are resumed
2741 while (1) {
2742 sigsuspend(&suspend_set);
2743
2744 os::SuspendResume::State result = osthread->sr.running();
2745 if (result == os::SuspendResume::SR_RUNNING) {
2746 sr_semaphore.signal();
2747 break;
2748 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2749 ShouldNotReachHere();
2750 }
2751 }
2752
2753 } else if (state == os::SuspendResume::SR_RUNNING) {
2754 // request was cancelled, continue
2755 } else {
2756 ShouldNotReachHere();
2757 }
2758
2759 resume_clear_context(osthread);
2760 } else if (current == os::SuspendResume::SR_RUNNING) {
2761 // request was cancelled, continue
2762 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2763 // ignore
2764 } else {
2765 // ignore
2766 }
2767
2768 errno = old_errno;
2769 }
2770
2771
2772 static int SR_initialize() {
2773 struct sigaction act;
2774 char *s;
2775 // Get signal number to use for suspend/resume
2776 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2777 int sig = ::strtol(s, 0, 10);
2778 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2779 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2780 SR_signum = sig;
2781 } else {
2782 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2783 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2784 }
2785 }
2786
2787 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2788 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2789
2790 sigemptyset(&SR_sigset);
2791 sigaddset(&SR_sigset, SR_signum);
2792
2793 // Set up signal handler for suspend/resume
2794 act.sa_flags = SA_RESTART|SA_SIGINFO;
2795 act.sa_handler = (void (*)(int)) SR_handler;
2796
2797 // SR_signum is blocked by default.
2798 // 4528190 - We also need to block pthread restart signal (32 on all
2799 // supported Bsd platforms). Note that BsdThreads need to block
2800 // this signal for all threads to work properly. So we don't have
2801 // to use hard-coded signal number when setting up the mask.
2802 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2803
2804 if (sigaction(SR_signum, &act, 0) == -1) {
2805 return -1;
2806 }
2807
2808 // Save signal flag
2809 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2810 return 0;
2811 }
2812
2813 static int sr_notify(OSThread* osthread) {
2814 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2815 assert_status(status == 0, status, "pthread_kill");
2816 return status;
2817 }
2818
2819 // "Randomly" selected value for how long we want to spin
2820 // before bailing out on suspending a thread, also how often
2821 // we send a signal to a thread we want to resume
2822 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2823 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2824
2825 // returns true on success and false on error - really an error is fatal
2826 // but this seems the normal response to library errors
2827 static bool do_suspend(OSThread* osthread) {
2828 assert(osthread->sr.is_running(), "thread should be running");
2829 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2830
2831 // mark as suspended and send signal
2832 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2833 // failed to switch, state wasn't running?
2834 ShouldNotReachHere();
2835 return false;
2836 }
2837
2838 if (sr_notify(osthread) != 0) {
2839 ShouldNotReachHere();
2840 }
2841
2842 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2843 while (true) {
2844 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2845 break;
2846 } else {
2847 // timeout
2848 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2849 if (cancelled == os::SuspendResume::SR_RUNNING) {
2850 return false;
2851 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2852 // make sure that we consume the signal on the semaphore as well
2853 sr_semaphore.wait();
2854 break;
2855 } else {
2856 ShouldNotReachHere();
2857 return false;
2858 }
2859 }
2860 }
2861
2862 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2863 return true;
2864 }
2865
2866 static void do_resume(OSThread* osthread) {
2867 assert(osthread->sr.is_suspended(), "thread should be suspended");
2868 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2869
2870 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2871 // failed to switch to WAKEUP_REQUEST
2872 ShouldNotReachHere();
2873 return;
2874 }
2875
2876 while (true) {
2877 if (sr_notify(osthread) == 0) {
2878 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2879 if (osthread->sr.is_running()) {
2880 return;
2881 }
2882 }
2883 } else {
2884 ShouldNotReachHere();
2885 }
2886 }
2887
2888 guarantee(osthread->sr.is_running(), "Must be running!");
2889 }
2890
2891 ///////////////////////////////////////////////////////////////////////////////////
2892 // signal handling (except suspend/resume)
2893
2894 // This routine may be used by user applications as a "hook" to catch signals.
2895 // The user-defined signal handler must pass unrecognized signals to this
2896 // routine, and if it returns true (non-zero), then the signal handler must
2897 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2898 // routine will never retun false (zero), but instead will execute a VM panic
2899 // routine kill the process.
2900 //
2901 // If this routine returns false, it is OK to call it again. This allows
2902 // the user-defined signal handler to perform checks either before or after
2903 // the VM performs its own checks. Naturally, the user code would be making
2904 // a serious error if it tried to handle an exception (such as a null check
2905 // or breakpoint) that the VM was generating for its own correct operation.
2906 //
2907 // This routine may recognize any of the following kinds of signals:
2908 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2909 // It should be consulted by handlers for any of those signals.
2910 //
2911 // The caller of this routine must pass in the three arguments supplied
2912 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2913 // field of the structure passed to sigaction(). This routine assumes that
2914 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2915 //
2916 // Note that the VM will print warnings if it detects conflicting signal
2917 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2918 //
2919 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2920 void* ucontext,
2921 int abort_if_unrecognized);
2922
2923 void signalHandler(int sig, siginfo_t* info, void* uc) {
2924 assert(info != NULL && uc != NULL, "it must be old kernel");
2925 int orig_errno = errno; // Preserve errno value over signal handler.
2926 JVM_handle_bsd_signal(sig, info, uc, true);
2927 errno = orig_errno;
2928 }
2929
2930
2931 // This boolean allows users to forward their own non-matching signals
2932 // to JVM_handle_bsd_signal, harmlessly.
2933 bool os::Bsd::signal_handlers_are_installed = false;
2934
2935 // For signal-chaining
2936 struct sigaction sigact[NSIG];
2937 uint32_t sigs = 0;
2938 #if (32 < NSIG-1)
2939 #error "Not all signals can be encoded in sigs. Adapt its type!"
2940 #endif
2941 bool os::Bsd::libjsig_is_loaded = false;
2942 typedef struct sigaction *(*get_signal_t)(int);
2943 get_signal_t os::Bsd::get_signal_action = NULL;
2944
2945 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2946 struct sigaction *actp = NULL;
2947
2948 if (libjsig_is_loaded) {
2949 // Retrieve the old signal handler from libjsig
2950 actp = (*get_signal_action)(sig);
2951 }
2952 if (actp == NULL) {
2953 // Retrieve the preinstalled signal handler from jvm
2954 actp = get_preinstalled_handler(sig);
2955 }
2956
2957 return actp;
2958 }
2959
2960 static bool call_chained_handler(struct sigaction *actp, int sig,
2961 siginfo_t *siginfo, void *context) {
2962 // Call the old signal handler
2963 if (actp->sa_handler == SIG_DFL) {
2964 // It's more reasonable to let jvm treat it as an unexpected exception
2965 // instead of taking the default action.
2966 return false;
2967 } else if (actp->sa_handler != SIG_IGN) {
2968 if ((actp->sa_flags & SA_NODEFER) == 0) {
2969 // automaticlly block the signal
2970 sigaddset(&(actp->sa_mask), sig);
2971 }
2972
2973 sa_handler_t hand;
2974 sa_sigaction_t sa;
2975 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2976 // retrieve the chained handler
2977 if (siginfo_flag_set) {
2978 sa = actp->sa_sigaction;
2979 } else {
2980 hand = actp->sa_handler;
2981 }
2982
2983 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2984 actp->sa_handler = SIG_DFL;
2985 }
2986
2987 // try to honor the signal mask
2988 sigset_t oset;
2989 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2990
2991 // call into the chained handler
2992 if (siginfo_flag_set) {
2993 (*sa)(sig, siginfo, context);
2994 } else {
2995 (*hand)(sig);
2996 }
2997
2998 // restore the signal mask
2999 pthread_sigmask(SIG_SETMASK, &oset, 0);
3000 }
3001 // Tell jvm's signal handler the signal is taken care of.
3002 return true;
3003 }
3004
3005 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3006 bool chained = false;
3007 // signal-chaining
3008 if (UseSignalChaining) {
3009 struct sigaction *actp = get_chained_signal_action(sig);
3010 if (actp != NULL) {
3011 chained = call_chained_handler(actp, sig, siginfo, context);
3012 }
3013 }
3014 return chained;
3015 }
3016
3017 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
3018 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
3019 return &sigact[sig];
3020 }
3021 return NULL;
3022 }
3023
3024 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3025 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3026 sigact[sig] = oldAct;
3027 sigs |= (uint32_t)1 << (sig-1);
3028 }
3029
3030 // for diagnostic
3031 int sigflags[NSIG];
3032
3033 int os::Bsd::get_our_sigflags(int sig) {
3034 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3035 return sigflags[sig];
3036 }
3037
3038 void os::Bsd::set_our_sigflags(int sig, int flags) {
3039 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3040 if (sig > 0 && sig < NSIG) {
3041 sigflags[sig] = flags;
3042 }
3043 }
3044
3045 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3046 // Check for overwrite.
3047 struct sigaction oldAct;
3048 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3049
3050 void* oldhand = oldAct.sa_sigaction
3051 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3052 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3053 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3054 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3055 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3056 if (AllowUserSignalHandlers || !set_installed) {
3057 // Do not overwrite; user takes responsibility to forward to us.
3058 return;
3059 } else if (UseSignalChaining) {
3060 // save the old handler in jvm
3061 save_preinstalled_handler(sig, oldAct);
3062 // libjsig also interposes the sigaction() call below and saves the
3063 // old sigaction on it own.
3064 } else {
3065 fatal("Encountered unexpected pre-existing sigaction handler "
3066 "%#lx for signal %d.", (long)oldhand, sig);
3067 }
3068 }
3069
3070 struct sigaction sigAct;
3071 sigfillset(&(sigAct.sa_mask));
3072 sigAct.sa_handler = SIG_DFL;
3073 if (!set_installed) {
3074 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3075 } else {
3076 sigAct.sa_sigaction = signalHandler;
3077 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3078 }
3079 #ifdef __APPLE__
3080 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3081 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3082 // if the signal handler declares it will handle it on alternate stack.
3083 // Notice we only declare we will handle it on alt stack, but we are not
3084 // actually going to use real alt stack - this is just a workaround.
3085 // Please see ux_exception.c, method catch_mach_exception_raise for details
3086 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3087 if (sig == SIGSEGV) {
3088 sigAct.sa_flags |= SA_ONSTACK;
3089 }
3090 #endif
3091
3092 // Save flags, which are set by ours
3093 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3094 sigflags[sig] = sigAct.sa_flags;
3095
3096 int ret = sigaction(sig, &sigAct, &oldAct);
3097 assert(ret == 0, "check");
3098
3099 void* oldhand2 = oldAct.sa_sigaction
3100 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3101 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3102 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3103 }
3104
3105 // install signal handlers for signals that HotSpot needs to
3106 // handle in order to support Java-level exception handling.
3107
3108 void os::Bsd::install_signal_handlers() {
3109 if (!signal_handlers_are_installed) {
3110 signal_handlers_are_installed = true;
3111
3112 // signal-chaining
3113 typedef void (*signal_setting_t)();
3114 signal_setting_t begin_signal_setting = NULL;
3115 signal_setting_t end_signal_setting = NULL;
3116 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3117 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3118 if (begin_signal_setting != NULL) {
3119 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3120 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3121 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3122 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3123 libjsig_is_loaded = true;
3124 assert(UseSignalChaining, "should enable signal-chaining");
3125 }
3126 if (libjsig_is_loaded) {
3127 // Tell libjsig jvm is setting signal handlers
3128 (*begin_signal_setting)();
3129 }
3130
3131 set_signal_handler(SIGSEGV, true);
3132 set_signal_handler(SIGPIPE, true);
3133 set_signal_handler(SIGBUS, true);
3134 set_signal_handler(SIGILL, true);
3135 set_signal_handler(SIGFPE, true);
3136 set_signal_handler(SIGXFSZ, true);
3137
3138 #if defined(__APPLE__)
3139 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3140 // signals caught and handled by the JVM. To work around this, we reset the mach task
3141 // signal handler that's placed on our process by CrashReporter. This disables
3142 // CrashReporter-based reporting.
3143 //
3144 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3145 // on caught fatal signals.
3146 //
3147 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3148 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3149 // exception handling, while leaving the standard BSD signal handlers functional.
3150 kern_return_t kr;
3151 kr = task_set_exception_ports(mach_task_self(),
3152 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3153 MACH_PORT_NULL,
3154 EXCEPTION_STATE_IDENTITY,
3155 MACHINE_THREAD_STATE);
3156
3157 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3158 #endif
3159
3160 if (libjsig_is_loaded) {
3161 // Tell libjsig jvm finishes setting signal handlers
3162 (*end_signal_setting)();
3163 }
3164
3165 // We don't activate signal checker if libjsig is in place, we trust ourselves
3166 // and if UserSignalHandler is installed all bets are off
3167 if (CheckJNICalls) {
3168 if (libjsig_is_loaded) {
3169 if (PrintJNIResolving) {
3170 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3171 }
3172 check_signals = false;
3173 }
3174 if (AllowUserSignalHandlers) {
3175 if (PrintJNIResolving) {
3176 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3177 }
3178 check_signals = false;
3179 }
3180 }
3181 }
3182 }
3183
3184
3185 /////
3186 // glibc on Bsd platform uses non-documented flag
3187 // to indicate, that some special sort of signal
3188 // trampoline is used.
3189 // We will never set this flag, and we should
3190 // ignore this flag in our diagnostic
3191 #ifdef SIGNIFICANT_SIGNAL_MASK
3192 #undef SIGNIFICANT_SIGNAL_MASK
3193 #endif
3194 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3195
3196 static const char* get_signal_handler_name(address handler,
3197 char* buf, int buflen) {
3198 int offset;
3199 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3200 if (found) {
3201 // skip directory names
3202 const char *p1, *p2;
3203 p1 = buf;
3204 size_t len = strlen(os::file_separator());
3205 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3206 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3207 } else {
3208 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3209 }
3210 return buf;
3211 }
3212
3213 static void print_signal_handler(outputStream* st, int sig,
3214 char* buf, size_t buflen) {
3215 struct sigaction sa;
3216
3217 sigaction(sig, NULL, &sa);
3218
3219 // See comment for SIGNIFICANT_SIGNAL_MASK define
3220 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3221
3222 st->print("%s: ", os::exception_name(sig, buf, buflen));
3223
3224 address handler = (sa.sa_flags & SA_SIGINFO)
3225 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3226 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3227
3228 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3229 st->print("SIG_DFL");
3230 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3231 st->print("SIG_IGN");
3232 } else {
3233 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3234 }
3235
3236 st->print(", sa_mask[0]=");
3237 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3238
3239 address rh = VMError::get_resetted_sighandler(sig);
3240 // May be, handler was resetted by VMError?
3241 if (rh != NULL) {
3242 handler = rh;
3243 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3244 }
3245
3246 st->print(", sa_flags=");
3247 os::Posix::print_sa_flags(st, sa.sa_flags);
3248
3249 // Check: is it our handler?
3250 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3251 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3252 // It is our signal handler
3253 // check for flags, reset system-used one!
3254 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3255 st->print(
3256 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3257 os::Bsd::get_our_sigflags(sig));
3258 }
3259 }
3260 st->cr();
3261 }
3262
3263
3264 #define DO_SIGNAL_CHECK(sig) \
3265 do { \
3266 if (!sigismember(&check_signal_done, sig)) { \
3267 os::Bsd::check_signal_handler(sig); \
3268 } \
3269 } while (0)
3270
3271 // This method is a periodic task to check for misbehaving JNI applications
3272 // under CheckJNI, we can add any periodic checks here
3273
3274 void os::run_periodic_checks() {
3275
3276 if (check_signals == false) return;
3277
3278 // SEGV and BUS if overridden could potentially prevent
3279 // generation of hs*.log in the event of a crash, debugging
3280 // such a case can be very challenging, so we absolutely
3281 // check the following for a good measure:
3282 DO_SIGNAL_CHECK(SIGSEGV);
3283 DO_SIGNAL_CHECK(SIGILL);
3284 DO_SIGNAL_CHECK(SIGFPE);
3285 DO_SIGNAL_CHECK(SIGBUS);
3286 DO_SIGNAL_CHECK(SIGPIPE);
3287 DO_SIGNAL_CHECK(SIGXFSZ);
3288
3289
3290 // ReduceSignalUsage allows the user to override these handlers
3291 // see comments at the very top and jvm_solaris.h
3292 if (!ReduceSignalUsage) {
3293 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3294 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3295 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3296 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3297 }
3298
3299 DO_SIGNAL_CHECK(SR_signum);
3300 }
3301
3302 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3303
3304 static os_sigaction_t os_sigaction = NULL;
3305
3306 void os::Bsd::check_signal_handler(int sig) {
3307 char buf[O_BUFLEN];
3308 address jvmHandler = NULL;
3309
3310
3311 struct sigaction act;
3312 if (os_sigaction == NULL) {
3313 // only trust the default sigaction, in case it has been interposed
3314 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3315 if (os_sigaction == NULL) return;
3316 }
3317
3318 os_sigaction(sig, (struct sigaction*)NULL, &act);
3319
3320
3321 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3322
3323 address thisHandler = (act.sa_flags & SA_SIGINFO)
3324 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3325 : CAST_FROM_FN_PTR(address, act.sa_handler);
3326
3327
3328 switch (sig) {
3329 case SIGSEGV:
3330 case SIGBUS:
3331 case SIGFPE:
3332 case SIGPIPE:
3333 case SIGILL:
3334 case SIGXFSZ:
3335 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3336 break;
3337
3338 case SHUTDOWN1_SIGNAL:
3339 case SHUTDOWN2_SIGNAL:
3340 case SHUTDOWN3_SIGNAL:
3341 case BREAK_SIGNAL:
3342 jvmHandler = (address)user_handler();
3343 break;
3344
3345 default:
3346 if (sig == SR_signum) {
3347 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3348 } else {
3349 return;
3350 }
3351 break;
3352 }
3353
3354 if (thisHandler != jvmHandler) {
3355 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3356 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3357 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3358 // No need to check this sig any longer
3359 sigaddset(&check_signal_done, sig);
3360 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3361 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3362 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3363 exception_name(sig, buf, O_BUFLEN));
3364 }
3365 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3366 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3367 tty->print("expected:");
3368 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3369 tty->cr();
3370 tty->print(" found:");
3371 os::Posix::print_sa_flags(tty, act.sa_flags);
3372 tty->cr();
3373 // No need to check this sig any longer
3374 sigaddset(&check_signal_done, sig);
3375 }
3376
3377 // Dump all the signal
3378 if (sigismember(&check_signal_done, sig)) {
3379 print_signal_handlers(tty, buf, O_BUFLEN);
3380 }
3381 }
3382
3383 extern void report_error(char* file_name, int line_no, char* title,
3384 char* format, ...);
3385
3386 // this is called _before_ the most of global arguments have been parsed
3387 void os::init(void) {
3388 char dummy; // used to get a guess on initial stack address
3389 // first_hrtime = gethrtime();
3390
3391 // With BsdThreads the JavaMain thread pid (primordial thread)
3392 // is different than the pid of the java launcher thread.
3393 // So, on Bsd, the launcher thread pid is passed to the VM
3394 // via the sun.java.launcher.pid property.
3395 // Use this property instead of getpid() if it was correctly passed.
3396 // See bug 6351349.
3397 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3398
3399 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3400
3401 clock_tics_per_sec = CLK_TCK;
3402
3403 init_random(1234567);
3404
3405 ThreadCritical::initialize();
3406
3407 Bsd::set_page_size(getpagesize());
3408 if (Bsd::page_size() == -1) {
3409 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", strerror(errno));
3410 }
3411 init_page_sizes((size_t) Bsd::page_size());
3412
3413 Bsd::initialize_system_info();
3414
3415 // main_thread points to the aboriginal thread
3416 Bsd::_main_thread = pthread_self();
3417
3418 Bsd::clock_init();
3419 initial_time_count = javaTimeNanos();
3420
3421 #ifdef __APPLE__
3422 // XXXDARWIN
3423 // Work around the unaligned VM callbacks in hotspot's
3424 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3425 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3426 // alignment when doing symbol lookup. To work around this, we force early
3427 // binding of all symbols now, thus binding when alignment is known-good.
3428 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3429 #endif
3430 }
3431
3432 // To install functions for atexit system call
3433 extern "C" {
3434 static void perfMemory_exit_helper() {
3435 perfMemory_exit();
3436 }
3437 }
3438
3439 // this is called _after_ the global arguments have been parsed
3440 jint os::init_2(void) {
3441 // Allocate a single page and mark it as readable for safepoint polling
3442 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3443 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page");
3444
3445 os::set_polling_page(polling_page);
3446
3447 #ifndef PRODUCT
3448 if (Verbose && PrintMiscellaneous) {
3449 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
3450 (intptr_t)polling_page);
3451 }
3452 #endif
3453
3454 if (!UseMembar) {
3455 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3456 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page");
3457 os::set_memory_serialize_page(mem_serialize_page);
3458
3459 #ifndef PRODUCT
3460 if (Verbose && PrintMiscellaneous) {
3461 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
3462 (intptr_t)mem_serialize_page);
3463 }
3464 #endif
3465 }
3466
3467 // initialize suspend/resume support - must do this before signal_sets_init()
3468 if (SR_initialize() != 0) {
3469 perror("SR_initialize failed");
3470 return JNI_ERR;
3471 }
3472
3473 Bsd::signal_sets_init();
3474 Bsd::install_signal_handlers();
3475
3476 // Check minimum allowable stack size for thread creation and to initialize
3477 // the java system classes, including StackOverflowError - depends on page
3478 // size. Add a page for compiler2 recursion in main thread.
3479 // Add in 2*BytesPerWord times page size to account for VM stack during
3480 // class initialization depending on 32 or 64 bit VM.
3481 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
3482 JavaThread::stack_guard_zone_size() +
3483 JavaThread::stack_shadow_zone_size() +
3484 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
3485
3486 size_t threadStackSizeInBytes = ThreadStackSize * K;
3487 if (threadStackSizeInBytes != 0 &&
3488 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
3489 tty->print_cr("\nThe stack size specified is too small, "
3490 "Specify at least %dk",
3491 os::Bsd::min_stack_allowed/ K);
3492 return JNI_ERR;
3493 }
3494
3495 // Make the stack size a multiple of the page size so that
3496 // the yellow/red zones can be guarded.
3497 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
3498 vm_page_size()));
3499
3500 if (MaxFDLimit) {
3501 // set the number of file descriptors to max. print out error
3502 // if getrlimit/setrlimit fails but continue regardless.
3503 struct rlimit nbr_files;
3504 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3505 if (status != 0) {
3506 if (PrintMiscellaneous && (Verbose || WizardMode)) {
3507 perror("os::init_2 getrlimit failed");
3508 }
3509 } else {
3510 nbr_files.rlim_cur = nbr_files.rlim_max;
3511
3512 #ifdef __APPLE__
3513 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3514 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3515 // be used instead
3516 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3517 #endif
3518
3519 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3520 if (status != 0) {
3521 if (PrintMiscellaneous && (Verbose || WizardMode)) {
3522 perror("os::init_2 setrlimit failed");
3523 }
3524 }
3525 }
3526 }
3527
3528 // at-exit methods are called in the reverse order of their registration.
3529 // atexit functions are called on return from main or as a result of a
3530 // call to exit(3C). There can be only 32 of these functions registered
3531 // and atexit() does not set errno.
3532
3533 if (PerfAllowAtExitRegistration) {
3534 // only register atexit functions if PerfAllowAtExitRegistration is set.
3535 // atexit functions can be delayed until process exit time, which
3536 // can be problematic for embedded VM situations. Embedded VMs should
3537 // call DestroyJavaVM() to assure that VM resources are released.
3538
3539 // note: perfMemory_exit_helper atexit function may be removed in
3540 // the future if the appropriate cleanup code can be added to the
3541 // VM_Exit VMOperation's doit method.
3542 if (atexit(perfMemory_exit_helper) != 0) {
3543 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3544 }
3545 }
3546
3547 // initialize thread priority policy
3548 prio_init();
3549
3550 #ifdef __APPLE__
3551 // dynamically link to objective c gc registration
3552 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3553 if (handleLibObjc != NULL) {
3554 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3555 }
3556 #endif
3557
3558 return JNI_OK;
3559 }
3560
3561 // Mark the polling page as unreadable
3562 void os::make_polling_page_unreadable(void) {
3563 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3564 fatal("Could not disable polling page");
3565 }
3566 }
3567
3568 // Mark the polling page as readable
3569 void os::make_polling_page_readable(void) {
3570 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3571 fatal("Could not enable polling page");
3572 }
3573 }
3574
3575 int os::active_processor_count() {
3576 return _processor_count;
3577 }
3578
3579 void os::set_native_thread_name(const char *name) {
3580 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3581 // This is only supported in Snow Leopard and beyond
3582 if (name != NULL) {
3583 // Add a "Java: " prefix to the name
3584 char buf[MAXTHREADNAMESIZE];
3585 snprintf(buf, sizeof(buf), "Java: %s", name);
3586 pthread_setname_np(buf);
3587 }
3588 #endif
3589 }
3590
3591 bool os::distribute_processes(uint length, uint* distribution) {
3592 // Not yet implemented.
3593 return false;
3594 }
3595
3596 bool os::bind_to_processor(uint processor_id) {
3597 // Not yet implemented.
3598 return false;
3599 }
3600
3601 void os::SuspendedThreadTask::internal_do_task() {
3602 if (do_suspend(_thread->osthread())) {
3603 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3604 do_task(context);
3605 do_resume(_thread->osthread());
3606 }
3607 }
3608
3609 ///
3610 class PcFetcher : public os::SuspendedThreadTask {
3611 public:
3612 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3613 ExtendedPC result();
3614 protected:
3615 void do_task(const os::SuspendedThreadTaskContext& context);
3616 private:
3617 ExtendedPC _epc;
3618 };
3619
3620 ExtendedPC PcFetcher::result() {
3621 guarantee(is_done(), "task is not done yet.");
3622 return _epc;
3623 }
3624
3625 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3626 Thread* thread = context.thread();
3627 OSThread* osthread = thread->osthread();
3628 if (osthread->ucontext() != NULL) {
3629 _epc = os::Bsd::ucontext_get_pc((const ucontext_t *) context.ucontext());
3630 } else {
3631 // NULL context is unexpected, double-check this is the VMThread
3632 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3633 }
3634 }
3635
3636 // Suspends the target using the signal mechanism and then grabs the PC before
3637 // resuming the target. Used by the flat-profiler only
3638 ExtendedPC os::get_thread_pc(Thread* thread) {
3639 // Make sure that it is called by the watcher for the VMThread
3640 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3641 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3642
3643 PcFetcher fetcher(thread);
3644 fetcher.run();
3645 return fetcher.result();
3646 }
3647
3648 ////////////////////////////////////////////////////////////////////////////////
3649 // debug support
3650
3651 bool os::find(address addr, outputStream* st) {
3652 Dl_info dlinfo;
3653 memset(&dlinfo, 0, sizeof(dlinfo));
3654 if (dladdr(addr, &dlinfo) != 0) {
3655 st->print(PTR_FORMAT ": ", addr);
3656 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3657 st->print("%s+%#x", dlinfo.dli_sname,
3658 addr - (intptr_t)dlinfo.dli_saddr);
3659 } else if (dlinfo.dli_fbase != NULL) {
3660 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3661 } else {
3662 st->print("<absolute address>");
3663 }
3664 if (dlinfo.dli_fname != NULL) {
3665 st->print(" in %s", dlinfo.dli_fname);
3666 }
3667 if (dlinfo.dli_fbase != NULL) {
3668 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3669 }
3670 st->cr();
3671
3672 if (Verbose) {
3673 // decode some bytes around the PC
3674 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3675 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3676 address lowest = (address) dlinfo.dli_sname;
3677 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3678 if (begin < lowest) begin = lowest;
3679 Dl_info dlinfo2;
3680 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3681 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3682 end = (address) dlinfo2.dli_saddr;
3683 }
3684 Disassembler::decode(begin, end, st);
3685 }
3686 return true;
3687 }
3688 return false;
3689 }
3690
3691 ////////////////////////////////////////////////////////////////////////////////
3692 // misc
3693
3694 // This does not do anything on Bsd. This is basically a hook for being
3695 // able to use structured exception handling (thread-local exception filters)
3696 // on, e.g., Win32.
3697 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3698 const methodHandle& method, JavaCallArguments* args,
3699 Thread* thread) {
3700 f(value, method, args, thread);
3701 }
3702
3703 void os::print_statistics() {
3704 }
3705
3706 bool os::message_box(const char* title, const char* message) {
3707 int i;
3708 fdStream err(defaultStream::error_fd());
3709 for (i = 0; i < 78; i++) err.print_raw("=");
3710 err.cr();
3711 err.print_raw_cr(title);
3712 for (i = 0; i < 78; i++) err.print_raw("-");
3713 err.cr();
3714 err.print_raw_cr(message);
3715 for (i = 0; i < 78; i++) err.print_raw("=");
3716 err.cr();
3717
3718 char buf[16];
3719 // Prevent process from exiting upon "read error" without consuming all CPU
3720 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3721
3722 return buf[0] == 'y' || buf[0] == 'Y';
3723 }
3724
3725 int os::stat(const char *path, struct stat *sbuf) {
3726 char pathbuf[MAX_PATH];
3727 if (strlen(path) > MAX_PATH - 1) {
3728 errno = ENAMETOOLONG;
3729 return -1;
3730 }
3731 os::native_path(strcpy(pathbuf, path));
3732 return ::stat(pathbuf, sbuf);
3733 }
3734
3735 bool os::check_heap(bool force) {
3736 return true;
3737 }
3738
3739 // Is a (classpath) directory empty?
3740 bool os::dir_is_empty(const char* path) {
3741 DIR *dir = NULL;
3742 struct dirent *ptr;
3743
3744 dir = opendir(path);
3745 if (dir == NULL) return true;
3746
3747 // Scan the directory
3748 bool result = true;
3749 char buf[sizeof(struct dirent) + MAX_PATH];
3750 while (result && (ptr = ::readdir(dir)) != NULL) {
3751 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3752 result = false;
3753 }
3754 }
3755 closedir(dir);
3756 return result;
3757 }
3758
3759 // This code originates from JDK's sysOpen and open64_w
3760 // from src/solaris/hpi/src/system_md.c
3761
3762 int os::open(const char *path, int oflag, int mode) {
3763 if (strlen(path) > MAX_PATH - 1) {
3764 errno = ENAMETOOLONG;
3765 return -1;
3766 }
3767 int fd;
3768
3769 fd = ::open(path, oflag, mode);
3770 if (fd == -1) return -1;
3771
3772 // If the open succeeded, the file might still be a directory
3773 {
3774 struct stat buf;
3775 int ret = ::fstat(fd, &buf);
3776 int st_mode = buf.st_mode;
3777
3778 if (ret != -1) {
3779 if ((st_mode & S_IFMT) == S_IFDIR) {
3780 errno = EISDIR;
3781 ::close(fd);
3782 return -1;
3783 }
3784 } else {
3785 ::close(fd);
3786 return -1;
3787 }
3788 }
3789
3790 // All file descriptors that are opened in the JVM and not
3791 // specifically destined for a subprocess should have the
3792 // close-on-exec flag set. If we don't set it, then careless 3rd
3793 // party native code might fork and exec without closing all
3794 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3795 // UNIXProcess.c), and this in turn might:
3796 //
3797 // - cause end-of-file to fail to be detected on some file
3798 // descriptors, resulting in mysterious hangs, or
3799 //
3800 // - might cause an fopen in the subprocess to fail on a system
3801 // suffering from bug 1085341.
3802 //
3803 // (Yes, the default setting of the close-on-exec flag is a Unix
3804 // design flaw)
3805 //
3806 // See:
3807 // 1085341: 32-bit stdio routines should support file descriptors >255
3808 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3809 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3810 //
3811 #ifdef FD_CLOEXEC
3812 {
3813 int flags = ::fcntl(fd, F_GETFD);
3814 if (flags != -1) {
3815 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3816 }
3817 }
3818 #endif
3819
3820 return fd;
3821 }
3822
3823
3824 // create binary file, rewriting existing file if required
3825 int os::create_binary_file(const char* path, bool rewrite_existing) {
3826 int oflags = O_WRONLY | O_CREAT;
3827 if (!rewrite_existing) {
3828 oflags |= O_EXCL;
3829 }
3830 return ::open(path, oflags, S_IREAD | S_IWRITE);
3831 }
3832
3833 // return current position of file pointer
3834 jlong os::current_file_offset(int fd) {
3835 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3836 }
3837
3838 // move file pointer to the specified offset
3839 jlong os::seek_to_file_offset(int fd, jlong offset) {
3840 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3841 }
3842
3843 // This code originates from JDK's sysAvailable
3844 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3845
3846 int os::available(int fd, jlong *bytes) {
3847 jlong cur, end;
3848 int mode;
3849 struct stat buf;
3850
3851 if (::fstat(fd, &buf) >= 0) {
3852 mode = buf.st_mode;
3853 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3854 int n;
3855 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3856 *bytes = n;
3857 return 1;
3858 }
3859 }
3860 }
3861 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3862 return 0;
3863 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3864 return 0;
3865 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3866 return 0;
3867 }
3868 *bytes = end - cur;
3869 return 1;
3870 }
3871
3872 // Map a block of memory.
3873 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3874 char *addr, size_t bytes, bool read_only,
3875 bool allow_exec) {
3876 int prot;
3877 int flags;
3878
3879 if (read_only) {
3880 prot = PROT_READ;
3881 flags = MAP_SHARED;
3882 } else {
3883 prot = PROT_READ | PROT_WRITE;
3884 flags = MAP_PRIVATE;
3885 }
3886
3887 if (allow_exec) {
3888 prot |= PROT_EXEC;
3889 }
3890
3891 if (addr != NULL) {
3892 flags |= MAP_FIXED;
3893 }
3894
3895 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3896 fd, file_offset);
3897 if (mapped_address == MAP_FAILED) {
3898 return NULL;
3899 }
3900 return mapped_address;
3901 }
3902
3903
3904 // Remap a block of memory.
3905 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3906 char *addr, size_t bytes, bool read_only,
3907 bool allow_exec) {
3908 // same as map_memory() on this OS
3909 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3910 allow_exec);
3911 }
3912
3913
3914 // Unmap a block of memory.
3915 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3916 return munmap(addr, bytes) == 0;
3917 }
3918
3919 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3920 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3921 // of a thread.
3922 //
3923 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3924 // the fast estimate available on the platform.
3925
3926 jlong os::current_thread_cpu_time() {
3927 #ifdef __APPLE__
3928 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3929 #else
3930 Unimplemented();
3931 return 0;
3932 #endif
3933 }
3934
3935 jlong os::thread_cpu_time(Thread* thread) {
3936 #ifdef __APPLE__
3937 return os::thread_cpu_time(thread, true /* user + sys */);
3938 #else
3939 Unimplemented();
3940 return 0;
3941 #endif
3942 }
3943
3944 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3945 #ifdef __APPLE__
3946 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3947 #else
3948 Unimplemented();
3949 return 0;
3950 #endif
3951 }
3952
3953 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3954 #ifdef __APPLE__
3955 struct thread_basic_info tinfo;
3956 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3957 kern_return_t kr;
3958 thread_t mach_thread;
3959
3960 mach_thread = thread->osthread()->thread_id();
3961 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3962 if (kr != KERN_SUCCESS) {
3963 return -1;
3964 }
3965
3966 if (user_sys_cpu_time) {
3967 jlong nanos;
3968 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3969 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3970 return nanos;
3971 } else {
3972 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3973 }
3974 #else
3975 Unimplemented();
3976 return 0;
3977 #endif
3978 }
3979
3980
3981 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3982 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3983 info_ptr->may_skip_backward = false; // elapsed time not wall time
3984 info_ptr->may_skip_forward = false; // elapsed time not wall time
3985 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3986 }
3987
3988 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3989 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3990 info_ptr->may_skip_backward = false; // elapsed time not wall time
3991 info_ptr->may_skip_forward = false; // elapsed time not wall time
3992 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3993 }
3994
3995 bool os::is_thread_cpu_time_supported() {
3996 #ifdef __APPLE__
3997 return true;
3998 #else
3999 return false;
4000 #endif
4001 }
4002
4003 // System loadavg support. Returns -1 if load average cannot be obtained.
4004 // Bsd doesn't yet have a (official) notion of processor sets,
4005 // so just return the system wide load average.
4006 int os::loadavg(double loadavg[], int nelem) {
4007 return ::getloadavg(loadavg, nelem);
4008 }
4009
4010 void os::pause() {
4011 char filename[MAX_PATH];
4012 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4013 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4014 } else {
4015 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4016 }
4017
4018 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4019 if (fd != -1) {
4020 struct stat buf;
4021 ::close(fd);
4022 while (::stat(filename, &buf) == 0) {
4023 (void)::poll(NULL, 0, 100);
4024 }
4025 } else {
4026 jio_fprintf(stderr,
4027 "Could not open pause file '%s', continuing immediately.\n", filename);
4028 }
4029 }
4030
4031
4032 // Refer to the comments in os_solaris.cpp park-unpark. The next two
4033 // comment paragraphs are worth repeating here:
4034 //
4035 // Assumption:
4036 // Only one parker can exist on an event, which is why we allocate
4037 // them per-thread. Multiple unparkers can coexist.
4038 //
4039 // _Event serves as a restricted-range semaphore.
4040 // -1 : thread is blocked, i.e. there is a waiter
4041 // 0 : neutral: thread is running or ready,
4042 // could have been signaled after a wait started
4043 // 1 : signaled - thread is running or ready
4044 //
4045
4046 // utility to compute the abstime argument to timedwait:
4047 // millis is the relative timeout time
4048 // abstime will be the absolute timeout time
4049 // TODO: replace compute_abstime() with unpackTime()
4050
4051 static struct timespec* compute_abstime(struct timespec* abstime,
4052 jlong millis) {
4053 if (millis < 0) millis = 0;
4054 struct timeval now;
4055 int status = gettimeofday(&now, NULL);
4056 assert(status == 0, "gettimeofday");
4057 jlong seconds = millis / 1000;
4058 millis %= 1000;
4059 if (seconds > 50000000) { // see man cond_timedwait(3T)
4060 seconds = 50000000;
4061 }
4062 abstime->tv_sec = now.tv_sec + seconds;
4063 long usec = now.tv_usec + millis * 1000;
4064 if (usec >= 1000000) {
4065 abstime->tv_sec += 1;
4066 usec -= 1000000;
4067 }
4068 abstime->tv_nsec = usec * 1000;
4069 return abstime;
4070 }
4071
4072 void os::PlatformEvent::park() { // AKA "down()"
4073 // Transitions for _Event:
4074 // -1 => -1 : illegal
4075 // 1 => 0 : pass - return immediately
4076 // 0 => -1 : block; then set _Event to 0 before returning
4077
4078 // Invariant: Only the thread associated with the Event/PlatformEvent
4079 // may call park().
4080 // TODO: assert that _Assoc != NULL or _Assoc == Self
4081 assert(_nParked == 0, "invariant");
4082
4083 int v;
4084 for (;;) {
4085 v = _Event;
4086 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4087 }
4088 guarantee(v >= 0, "invariant");
4089 if (v == 0) {
4090 // Do this the hard way by blocking ...
4091 int status = pthread_mutex_lock(_mutex);
4092 assert_status(status == 0, status, "mutex_lock");
4093 guarantee(_nParked == 0, "invariant");
4094 ++_nParked;
4095 while (_Event < 0) {
4096 status = pthread_cond_wait(_cond, _mutex);
4097 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4098 // Treat this the same as if the wait was interrupted
4099 if (status == ETIMEDOUT) { status = EINTR; }
4100 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4101 }
4102 --_nParked;
4103
4104 _Event = 0;
4105 status = pthread_mutex_unlock(_mutex);
4106 assert_status(status == 0, status, "mutex_unlock");
4107 // Paranoia to ensure our locked and lock-free paths interact
4108 // correctly with each other.
4109 OrderAccess::fence();
4110 }
4111 guarantee(_Event >= 0, "invariant");
4112 }
4113
4114 int os::PlatformEvent::park(jlong millis) {
4115 // Transitions for _Event:
4116 // -1 => -1 : illegal
4117 // 1 => 0 : pass - return immediately
4118 // 0 => -1 : block; then set _Event to 0 before returning
4119
4120 guarantee(_nParked == 0, "invariant");
4121
4122 int v;
4123 for (;;) {
4124 v = _Event;
4125 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4126 }
4127 guarantee(v >= 0, "invariant");
4128 if (v != 0) return OS_OK;
4129
4130 // We do this the hard way, by blocking the thread.
4131 // Consider enforcing a minimum timeout value.
4132 struct timespec abst;
4133 compute_abstime(&abst, millis);
4134
4135 int ret = OS_TIMEOUT;
4136 int status = pthread_mutex_lock(_mutex);
4137 assert_status(status == 0, status, "mutex_lock");
4138 guarantee(_nParked == 0, "invariant");
4139 ++_nParked;
4140
4141 // Object.wait(timo) will return because of
4142 // (a) notification
4143 // (b) timeout
4144 // (c) thread.interrupt
4145 //
4146 // Thread.interrupt and object.notify{All} both call Event::set.
4147 // That is, we treat thread.interrupt as a special case of notification.
4148 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4149 // We assume all ETIME returns are valid.
4150 //
4151 // TODO: properly differentiate simultaneous notify+interrupt.
4152 // In that case, we should propagate the notify to another waiter.
4153
4154 while (_Event < 0) {
4155 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4156 assert_status(status == 0 || status == EINTR ||
4157 status == ETIMEDOUT,
4158 status, "cond_timedwait");
4159 if (!FilterSpuriousWakeups) break; // previous semantics
4160 if (status == ETIMEDOUT) break;
4161 // We consume and ignore EINTR and spurious wakeups.
4162 }
4163 --_nParked;
4164 if (_Event >= 0) {
4165 ret = OS_OK;
4166 }
4167 _Event = 0;
4168 status = pthread_mutex_unlock(_mutex);
4169 assert_status(status == 0, status, "mutex_unlock");
4170 assert(_nParked == 0, "invariant");
4171 // Paranoia to ensure our locked and lock-free paths interact
4172 // correctly with each other.
4173 OrderAccess::fence();
4174 return ret;
4175 }
4176
4177 void os::PlatformEvent::unpark() {
4178 // Transitions for _Event:
4179 // 0 => 1 : just return
4180 // 1 => 1 : just return
4181 // -1 => either 0 or 1; must signal target thread
4182 // That is, we can safely transition _Event from -1 to either
4183 // 0 or 1.
4184 // See also: "Semaphores in Plan 9" by Mullender & Cox
4185 //
4186 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4187 // that it will take two back-to-back park() calls for the owning
4188 // thread to block. This has the benefit of forcing a spurious return
4189 // from the first park() call after an unpark() call which will help
4190 // shake out uses of park() and unpark() without condition variables.
4191
4192 if (Atomic::xchg(1, &_Event) >= 0) return;
4193
4194 // Wait for the thread associated with the event to vacate
4195 int status = pthread_mutex_lock(_mutex);
4196 assert_status(status == 0, status, "mutex_lock");
4197 int AnyWaiters = _nParked;
4198 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4199 status = pthread_mutex_unlock(_mutex);
4200 assert_status(status == 0, status, "mutex_unlock");
4201 if (AnyWaiters != 0) {
4202 // Note that we signal() *after* dropping the lock for "immortal" Events.
4203 // This is safe and avoids a common class of futile wakeups. In rare
4204 // circumstances this can cause a thread to return prematurely from
4205 // cond_{timed}wait() but the spurious wakeup is benign and the victim
4206 // will simply re-test the condition and re-park itself.
4207 // This provides particular benefit if the underlying platform does not
4208 // provide wait morphing.
4209 status = pthread_cond_signal(_cond);
4210 assert_status(status == 0, status, "cond_signal");
4211 }
4212 }
4213
4214
4215 // JSR166
4216 // -------------------------------------------------------
4217
4218 // The solaris and bsd implementations of park/unpark are fairly
4219 // conservative for now, but can be improved. They currently use a
4220 // mutex/condvar pair, plus a a count.
4221 // Park decrements count if > 0, else does a condvar wait. Unpark
4222 // sets count to 1 and signals condvar. Only one thread ever waits
4223 // on the condvar. Contention seen when trying to park implies that someone
4224 // is unparking you, so don't wait. And spurious returns are fine, so there
4225 // is no need to track notifications.
4226
4227 #define MAX_SECS 100000000
4228
4229 // This code is common to bsd and solaris and will be moved to a
4230 // common place in dolphin.
4231 //
4232 // The passed in time value is either a relative time in nanoseconds
4233 // or an absolute time in milliseconds. Either way it has to be unpacked
4234 // into suitable seconds and nanoseconds components and stored in the
4235 // given timespec structure.
4236 // Given time is a 64-bit value and the time_t used in the timespec is only
4237 // a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4238 // overflow if times way in the future are given. Further on Solaris versions
4239 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4240 // number of seconds, in abstime, is less than current_time + 100,000,000.
4241 // As it will be 28 years before "now + 100000000" will overflow we can
4242 // ignore overflow and just impose a hard-limit on seconds using the value
4243 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4244 // years from "now".
4245
4246 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4247 assert(time > 0, "convertTime");
4248
4249 struct timeval now;
4250 int status = gettimeofday(&now, NULL);
4251 assert(status == 0, "gettimeofday");
4252
4253 time_t max_secs = now.tv_sec + MAX_SECS;
4254
4255 if (isAbsolute) {
4256 jlong secs = time / 1000;
4257 if (secs > max_secs) {
4258 absTime->tv_sec = max_secs;
4259 } else {
4260 absTime->tv_sec = secs;
4261 }
4262 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4263 } else {
4264 jlong secs = time / NANOSECS_PER_SEC;
4265 if (secs >= MAX_SECS) {
4266 absTime->tv_sec = max_secs;
4267 absTime->tv_nsec = 0;
4268 } else {
4269 absTime->tv_sec = now.tv_sec + secs;
4270 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4271 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4272 absTime->tv_nsec -= NANOSECS_PER_SEC;
4273 ++absTime->tv_sec; // note: this must be <= max_secs
4274 }
4275 }
4276 }
4277 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4278 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4279 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4280 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4281 }
4282
4283 void Parker::park(bool isAbsolute, jlong time) {
4284 // Ideally we'd do something useful while spinning, such
4285 // as calling unpackTime().
4286
4287 // Optional fast-path check:
4288 // Return immediately if a permit is available.
4289 // We depend on Atomic::xchg() having full barrier semantics
4290 // since we are doing a lock-free update to _counter.
4291 if (Atomic::xchg(0, &_counter) > 0) return;
4292
4293 Thread* thread = Thread::current();
4294 assert(thread->is_Java_thread(), "Must be JavaThread");
4295 JavaThread *jt = (JavaThread *)thread;
4296
4297 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4298 // Check interrupt before trying to wait
4299 if (Thread::is_interrupted(thread, false)) {
4300 return;
4301 }
4302
4303 // Next, demultiplex/decode time arguments
4304 struct timespec absTime;
4305 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4306 return;
4307 }
4308 if (time > 0) {
4309 unpackTime(&absTime, isAbsolute, time);
4310 }
4311
4312
4313 // Enter safepoint region
4314 // Beware of deadlocks such as 6317397.
4315 // The per-thread Parker:: mutex is a classic leaf-lock.
4316 // In particular a thread must never block on the Threads_lock while
4317 // holding the Parker:: mutex. If safepoints are pending both the
4318 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4319 ThreadBlockInVM tbivm(jt);
4320
4321 // Don't wait if cannot get lock since interference arises from
4322 // unblocking. Also. check interrupt before trying wait
4323 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4324 return;
4325 }
4326
4327 int status;
4328 if (_counter > 0) { // no wait needed
4329 _counter = 0;
4330 status = pthread_mutex_unlock(_mutex);
4331 assert_status(status == 0, status, "invariant");
4332 // Paranoia to ensure our locked and lock-free paths interact
4333 // correctly with each other and Java-level accesses.
4334 OrderAccess::fence();
4335 return;
4336 }
4337
4338 #ifdef ASSERT
4339 // Don't catch signals while blocked; let the running threads have the signals.
4340 // (This allows a debugger to break into the running thread.)
4341 sigset_t oldsigs;
4342 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4343 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4344 #endif
4345
4346 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4347 jt->set_suspend_equivalent();
4348 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4349
4350 if (time == 0) {
4351 status = pthread_cond_wait(_cond, _mutex);
4352 } else {
4353 status = pthread_cond_timedwait(_cond, _mutex, &absTime);
4354 }
4355 assert_status(status == 0 || status == EINTR ||
4356 status == ETIMEDOUT,
4357 status, "cond_timedwait");
4358
4359 #ifdef ASSERT
4360 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4361 #endif
4362
4363 _counter = 0;
4364 status = pthread_mutex_unlock(_mutex);
4365 assert_status(status == 0, status, "invariant");
4366 // Paranoia to ensure our locked and lock-free paths interact
4367 // correctly with each other and Java-level accesses.
4368 OrderAccess::fence();
4369
4370 // If externally suspended while waiting, re-suspend
4371 if (jt->handle_special_suspend_equivalent_condition()) {
4372 jt->java_suspend_self();
4373 }
4374 }
4375
4376 void Parker::unpark() {
4377 int status = pthread_mutex_lock(_mutex);
4378 assert_status(status == 0, status, "invariant");
4379 const int s = _counter;
4380 _counter = 1;
4381 status = pthread_mutex_unlock(_mutex);
4382 assert_status(status == 0, status, "invariant");
4383 if (s < 1) {
4384 status = pthread_cond_signal(_cond);
4385 assert_status(status == 0, status, "invariant");
4386 }
4387 }
4388
4389
4390 // Darwin has no "environ" in a dynamic library.
4391 #ifdef __APPLE__
4392 #include <crt_externs.h>
4393 #define environ (*_NSGetEnviron())
4394 #else
4395 extern char** environ;
4396 #endif
4397
4398 // Run the specified command in a separate process. Return its exit value,
4399 // or -1 on failure (e.g. can't fork a new process).
4400 // Unlike system(), this function can be called from signal handler. It
4401 // doesn't block SIGINT et al.
4402 int os::fork_and_exec(char* cmd) {
4403 const char * argv[4] = {"sh", "-c", cmd, NULL};
4404
4405 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4406 // pthread_atfork handlers and reset pthread library. All we need is a
4407 // separate process to execve. Make a direct syscall to fork process.
4408 // On IA64 there's no fork syscall, we have to use fork() and hope for
4409 // the best...
4410 pid_t pid = fork();
4411
4412 if (pid < 0) {
4413 // fork failed
4414 return -1;
4415
4416 } else if (pid == 0) {
4417 // child process
4418
4419 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4420 // first to kill every thread on the thread list. Because this list is
4421 // not reset by fork() (see notes above), execve() will instead kill
4422 // every thread in the parent process. We know this is the only thread
4423 // in the new process, so make a system call directly.
4424 // IA64 should use normal execve() from glibc to match the glibc fork()
4425 // above.
4426 execve("/bin/sh", (char* const*)argv, environ);
4427
4428 // execve failed
4429 _exit(-1);
4430
4431 } else {
4432 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4433 // care about the actual exit code, for now.
4434
4435 int status;
4436
4437 // Wait for the child process to exit. This returns immediately if
4438 // the child has already exited. */
4439 while (waitpid(pid, &status, 0) < 0) {
4440 switch (errno) {
4441 case ECHILD: return 0;
4442 case EINTR: break;
4443 default: return -1;
4444 }
4445 }
4446
4447 if (WIFEXITED(status)) {
4448 // The child exited normally; get its exit code.
4449 return WEXITSTATUS(status);
4450 } else if (WIFSIGNALED(status)) {
4451 // The child exited because of a signal
4452 // The best value to return is 0x80 + signal number,
4453 // because that is what all Unix shells do, and because
4454 // it allows callers to distinguish between process exit and
4455 // process death by signal.
4456 return 0x80 + WTERMSIG(status);
4457 } else {
4458 // Unknown exit code; pass it through
4459 return status;
4460 }
4461 }
4462 }
4463
4464 // is_headless_jre()
4465 //
4466 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4467 // in order to report if we are running in a headless jre
4468 //
4469 // Since JDK8 xawt/libmawt.so was moved into the same directory
4470 // as libawt.so, and renamed libawt_xawt.so
4471 //
4472 bool os::is_headless_jre() {
4473 #ifdef __APPLE__
4474 // We no longer build headless-only on Mac OS X
4475 return false;
4476 #else
4477 struct stat statbuf;
4478 char buf[MAXPATHLEN];
4479 char libmawtpath[MAXPATHLEN];
4480 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4481 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4482 char *p;
4483
4484 // Get path to libjvm.so
4485 os::jvm_path(buf, sizeof(buf));
4486
4487 // Get rid of libjvm.so
4488 p = strrchr(buf, '/');
4489 if (p == NULL) {
4490 return false;
4491 } else {
4492 *p = '\0';
4493 }
4494
4495 // Get rid of client or server
4496 p = strrchr(buf, '/');
4497 if (p == NULL) {
4498 return false;
4499 } else {
4500 *p = '\0';
4501 }
4502
4503 // check xawt/libmawt.so
4504 strcpy(libmawtpath, buf);
4505 strcat(libmawtpath, xawtstr);
4506 if (::stat(libmawtpath, &statbuf) == 0) return false;
4507
4508 // check libawt_xawt.so
4509 strcpy(libmawtpath, buf);
4510 strcat(libmawtpath, new_xawtstr);
4511 if (::stat(libmawtpath, &statbuf) == 0) return false;
4512
4513 return true;
4514 #endif
4515 }
4516
4517 // Get the default path to the core file
4518 // Returns the length of the string
4519 int os::get_core_path(char* buffer, size_t bufferSize) {
4520 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
4521
4522 // Truncate if theoretical string was longer than bufferSize
4523 n = MIN2(n, (int)bufferSize);
4524
4525 return n;
4526 }
4527
4528 #ifndef PRODUCT
4529 void TestReserveMemorySpecial_test() {
4530 // No tests available for this platform
4531 }
4532 #endif
4533
4534 bool os::start_debugging(char *buf, int buflen) {
4535 int len = (int)strlen(buf);
4536 char *p = &buf[len];
4537
4538 jio_snprintf(p, buflen-len,
4539 "\n\n"
4540 "Do you want to debug the problem?\n\n"
4541 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
4542 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
4543 "Otherwise, press RETURN to abort...",
4544 os::current_process_id(), os::current_process_id(),
4545 os::current_thread_id(), os::current_thread_id());
4546
4547 bool yes = os::message_box("Unexpected Error", buf);
4548
4549 if (yes) {
4550 // yes, user asked VM to launch debugger
4551 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
4552 os::current_process_id(), os::current_process_id());
4553
4554 os::fork_and_exec(buf);
4555 yes = false;
4556 }
4557 return yes;
4558 }