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 "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.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.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 *thread_native_entry(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 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
685 os::current_thread_id(), (uintx) pthread_self());
686
687 #ifdef __APPLE__
688 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
689 guarantee(unique_thread_id != 0, "unique thread id was not found");
690 osthread->set_unique_thread_id(unique_thread_id);
691 #endif
692 // initialize signal mask for this thread
693 os::Bsd::hotspot_sigmask(thread);
694
695 // initialize floating point control register
696 os::Bsd::init_thread_fpu_state();
697
698 #ifdef __APPLE__
699 // register thread with objc gc
700 if (objc_registerThreadWithCollectorFunction != NULL) {
701 objc_registerThreadWithCollectorFunction();
702 }
703 #endif
704
705 // handshaking with parent thread
706 {
707 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
708
709 // notify parent thread
710 osthread->set_state(INITIALIZED);
711 sync->notify_all();
712
713 // wait until os::start_thread()
714 while (osthread->get_state() == INITIALIZED) {
715 sync->wait(Mutex::_no_safepoint_check_flag);
716 }
717 }
718
719 // call one more level start routine
720 thread->run();
721
722 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
723 os::current_thread_id(), (uintx) pthread_self());
724
725 // If a thread has not deleted itself ("delete this") as part of its
726 // termination sequence, we have to ensure thread-local-storage is
727 // cleared before we actually terminate. No threads should ever be
728 // deleted asynchronously with respect to their termination.
729 if (Thread::current_or_null_safe() != NULL) {
730 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
731 thread->clear_thread_current();
732 }
733
734 return 0;
735 }
736
737 bool os::create_thread(Thread* thread, ThreadType thr_type,
738 size_t req_stack_size) {
739 assert(thread->osthread() == NULL, "caller responsible");
740
741 // Allocate the OSThread object
742 OSThread* osthread = new OSThread(NULL, NULL);
743 if (osthread == NULL) {
744 return false;
745 }
746
747 // set the correct thread state
748 osthread->set_thread_type(thr_type);
749
750 // Initial state is ALLOCATED but not INITIALIZED
751 osthread->set_state(ALLOCATED);
752
753 thread->set_osthread(osthread);
754
755 // init thread attributes
756 pthread_attr_t attr;
757 pthread_attr_init(&attr);
758 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
759
760 // calculate stack size if it's not specified by caller
761 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
762 pthread_attr_setstacksize(&attr, stack_size);
763
764 ThreadState state;
765
766 {
767 pthread_t tid;
768 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
769
770 char buf[64];
771 if (ret == 0) {
772 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
773 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
774 } else {
775 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
776 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
777 }
778
779 pthread_attr_destroy(&attr);
780
781 if (ret != 0) {
782 // Need to clean up stuff we've allocated so far
783 thread->set_osthread(NULL);
784 delete osthread;
785 return false;
786 }
787
788 // Store pthread info into the OSThread
789 osthread->set_pthread_id(tid);
790
791 // Wait until child thread is either initialized or aborted
792 {
793 Monitor* sync_with_child = osthread->startThread_lock();
794 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
795 while ((state = osthread->get_state()) == ALLOCATED) {
796 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
797 }
798 }
799
800 }
801
802 // Aborted due to thread limit being reached
803 if (state == ZOMBIE) {
804 thread->set_osthread(NULL);
805 delete osthread;
806 return false;
807 }
808
809 // The thread is returned suspended (in state INITIALIZED),
810 // and is started higher up in the call chain
811 assert(state == INITIALIZED, "race condition");
812 return true;
813 }
814
815 /////////////////////////////////////////////////////////////////////////////
816 // attach existing thread
817
818 // bootstrap the main thread
819 bool os::create_main_thread(JavaThread* thread) {
820 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
821 return create_attached_thread(thread);
822 }
823
824 bool os::create_attached_thread(JavaThread* thread) {
825 #ifdef ASSERT
826 thread->verify_not_published();
827 #endif
828
829 // Allocate the OSThread object
830 OSThread* osthread = new OSThread(NULL, NULL);
831
832 if (osthread == NULL) {
833 return false;
834 }
835
836 osthread->set_thread_id(os::Bsd::gettid());
837
838 // Store pthread info into the OSThread
839 #ifdef __APPLE__
840 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
841 guarantee(unique_thread_id != 0, "just checking");
842 osthread->set_unique_thread_id(unique_thread_id);
843 #endif
844 osthread->set_pthread_id(::pthread_self());
845
846 // initialize floating point control register
847 os::Bsd::init_thread_fpu_state();
848
849 // Initial thread state is RUNNABLE
850 osthread->set_state(RUNNABLE);
851
852 thread->set_osthread(osthread);
853
854 // initialize signal mask for this thread
855 // and save the caller's signal mask
856 os::Bsd::hotspot_sigmask(thread);
857
858 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
859 os::current_thread_id(), (uintx) pthread_self());
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 // We are told to free resources of the argument thread,
877 // but we can only really operate on the current thread.
878 assert(Thread::current()->osthread() == osthread,
879 "os::free_thread but not current thread");
880
881 // Restore caller's signal mask
882 sigset_t sigmask = osthread->caller_sigmask();
883 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
884
885 delete osthread;
886 }
887
888 ////////////////////////////////////////////////////////////////////////////////
889 // time support
890
891 // Time since start-up in seconds to a fine granularity.
892 // Used by VMSelfDestructTimer and the MemProfiler.
893 double os::elapsedTime() {
894
895 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
896 }
897
898 jlong os::elapsed_counter() {
899 return javaTimeNanos() - initial_time_count;
900 }
901
902 jlong os::elapsed_frequency() {
903 return NANOSECS_PER_SEC; // nanosecond resolution
904 }
905
906 bool os::supports_vtime() { return true; }
907 bool os::enable_vtime() { return false; }
908 bool os::vtime_enabled() { return false; }
909
910 double os::elapsedVTime() {
911 // better than nothing, but not much
912 return elapsedTime();
913 }
914
915 jlong os::javaTimeMillis() {
916 timeval time;
917 int status = gettimeofday(&time, NULL);
918 assert(status != -1, "bsd error");
919 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
920 }
921
922 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
923 timeval time;
924 int status = gettimeofday(&time, NULL);
925 assert(status != -1, "bsd error");
926 seconds = jlong(time.tv_sec);
927 nanos = jlong(time.tv_usec) * 1000;
928 }
929
930 #ifndef __APPLE__
931 #ifndef CLOCK_MONOTONIC
932 #define CLOCK_MONOTONIC (1)
933 #endif
934 #endif
935
936 #ifdef __APPLE__
937 void os::Bsd::clock_init() {
938 mach_timebase_info(&_timebase_info);
939 }
940 #else
941 void os::Bsd::clock_init() {
942 struct timespec res;
943 struct timespec tp;
944 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
945 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
946 // yes, monotonic clock is supported
947 _clock_gettime = ::clock_gettime;
948 }
949 }
950 #endif
951
952
953
954 #ifdef __APPLE__
955
956 jlong os::javaTimeNanos() {
957 const uint64_t tm = mach_absolute_time();
958 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
959 const uint64_t prev = Bsd::_max_abstime;
960 if (now <= prev) {
961 return prev; // same or retrograde time;
962 }
963 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev);
964 assert(obsv >= prev, "invariant"); // Monotonicity
965 // If the CAS succeeded then we're done and return "now".
966 // If the CAS failed and the observed value "obsv" is >= now then
967 // we should return "obsv". If the CAS failed and now > obsv > prv then
968 // some other thread raced this thread and installed a new value, in which case
969 // we could either (a) retry the entire operation, (b) retry trying to install now
970 // or (c) just return obsv. We use (c). No loop is required although in some cases
971 // we might discard a higher "now" value in deference to a slightly lower but freshly
972 // installed obsv value. That's entirely benign -- it admits no new orderings compared
973 // to (a) or (b) -- and greatly reduces coherence traffic.
974 // We might also condition (c) on the magnitude of the delta between obsv and now.
975 // Avoiding excessive CAS operations to hot RW locations is critical.
976 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
977 return (prev == obsv) ? now : obsv;
978 }
979
980 #else // __APPLE__
981
982 jlong os::javaTimeNanos() {
983 if (os::supports_monotonic_clock()) {
984 struct timespec tp;
985 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
986 assert(status == 0, "gettime error");
987 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
988 return result;
989 } else {
990 timeval time;
991 int status = gettimeofday(&time, NULL);
992 assert(status != -1, "bsd error");
993 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
994 return 1000 * usecs;
995 }
996 }
997
998 #endif // __APPLE__
999
1000 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1001 if (os::supports_monotonic_clock()) {
1002 info_ptr->max_value = ALL_64_BITS;
1003
1004 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1005 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1006 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1007 } else {
1008 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1009 info_ptr->max_value = ALL_64_BITS;
1010
1011 // gettimeofday is a real time clock so it skips
1012 info_ptr->may_skip_backward = true;
1013 info_ptr->may_skip_forward = true;
1014 }
1015
1016 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1017 }
1018
1019 // Return the real, user, and system times in seconds from an
1020 // arbitrary fixed point in the past.
1021 bool os::getTimesSecs(double* process_real_time,
1022 double* process_user_time,
1023 double* process_system_time) {
1024 struct tms ticks;
1025 clock_t real_ticks = times(&ticks);
1026
1027 if (real_ticks == (clock_t) (-1)) {
1028 return false;
1029 } else {
1030 double ticks_per_second = (double) clock_tics_per_sec;
1031 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1032 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1033 *process_real_time = ((double) real_ticks) / ticks_per_second;
1034
1035 return true;
1036 }
1037 }
1038
1039
1040 char * os::local_time_string(char *buf, size_t buflen) {
1041 struct tm t;
1042 time_t long_time;
1043 time(&long_time);
1044 localtime_r(&long_time, &t);
1045 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1046 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1047 t.tm_hour, t.tm_min, t.tm_sec);
1048 return buf;
1049 }
1050
1051 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1052 return localtime_r(clock, res);
1053 }
1054
1055 ////////////////////////////////////////////////////////////////////////////////
1056 // runtime exit support
1057
1058 // Note: os::shutdown() might be called very early during initialization, or
1059 // called from signal handler. Before adding something to os::shutdown(), make
1060 // sure it is async-safe and can handle partially initialized VM.
1061 void os::shutdown() {
1062
1063 // allow PerfMemory to attempt cleanup of any persistent resources
1064 perfMemory_exit();
1065
1066 // needs to remove object in file system
1067 AttachListener::abort();
1068
1069 // flush buffered output, finish log files
1070 ostream_abort();
1071
1072 // Check for abort hook
1073 abort_hook_t abort_hook = Arguments::abort_hook();
1074 if (abort_hook != NULL) {
1075 abort_hook();
1076 }
1077
1078 }
1079
1080 // Note: os::abort() might be called very early during initialization, or
1081 // called from signal handler. Before adding something to os::abort(), make
1082 // sure it is async-safe and can handle partially initialized VM.
1083 void os::abort(bool dump_core, void* siginfo, const void* context) {
1084 os::shutdown();
1085 if (dump_core) {
1086 #ifndef PRODUCT
1087 fdStream out(defaultStream::output_fd());
1088 out.print_raw("Current thread is ");
1089 char buf[16];
1090 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1091 out.print_raw_cr(buf);
1092 out.print_raw_cr("Dumping core ...");
1093 #endif
1094 ::abort(); // dump core
1095 }
1096
1097 ::exit(1);
1098 }
1099
1100 // Die immediately, no exit hook, no abort hook, no cleanup.
1101 void os::die() {
1102 // _exit() on BsdThreads only kills current thread
1103 ::abort();
1104 }
1105
1106 // This method is a copy of JDK's sysGetLastErrorString
1107 // from src/solaris/hpi/src/system_md.c
1108
1109 size_t os::lasterror(char *buf, size_t len) {
1110 if (errno == 0) return 0;
1111
1112 const char *s = os::strerror(errno);
1113 size_t n = ::strlen(s);
1114 if (n >= len) {
1115 n = len - 1;
1116 }
1117 ::strncpy(buf, s, n);
1118 buf[n] = '\0';
1119 return n;
1120 }
1121
1122 // Information of current thread in variety of formats
1123 pid_t os::Bsd::gettid() {
1124 int retval = -1;
1125
1126 #ifdef __APPLE__ //XNU kernel
1127 // despite the fact mach port is actually not a thread id use it
1128 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1129 retval = ::pthread_mach_thread_np(::pthread_self());
1130 guarantee(retval != 0, "just checking");
1131 return retval;
1132
1133 #else
1134 #ifdef __FreeBSD__
1135 retval = syscall(SYS_thr_self);
1136 #else
1137 #ifdef __OpenBSD__
1138 retval = syscall(SYS_getthrid);
1139 #else
1140 #ifdef __NetBSD__
1141 retval = (pid_t) syscall(SYS__lwp_self);
1142 #endif
1143 #endif
1144 #endif
1145 #endif
1146
1147 if (retval == -1) {
1148 return getpid();
1149 }
1150 }
1151
1152 intx os::current_thread_id() {
1153 #ifdef __APPLE__
1154 return (intx)::pthread_mach_thread_np(::pthread_self());
1155 #else
1156 return (intx)::pthread_self();
1157 #endif
1158 }
1159
1160 int os::current_process_id() {
1161
1162 // Under the old bsd thread library, bsd gives each thread
1163 // its own process id. Because of this each thread will return
1164 // a different pid if this method were to return the result
1165 // of getpid(2). Bsd provides no api that returns the pid
1166 // of the launcher thread for the vm. This implementation
1167 // returns a unique pid, the pid of the launcher thread
1168 // that starts the vm 'process'.
1169
1170 // Under the NPTL, getpid() returns the same pid as the
1171 // launcher thread rather than a unique pid per thread.
1172 // Use gettid() if you want the old pre NPTL behaviour.
1173
1174 // if you are looking for the result of a call to getpid() that
1175 // returns a unique pid for the calling thread, then look at the
1176 // OSThread::thread_id() method in osThread_bsd.hpp file
1177
1178 return (int)(_initial_pid ? _initial_pid : getpid());
1179 }
1180
1181 // DLL functions
1182
1183 #define JNI_LIB_PREFIX "lib"
1184 #ifdef __APPLE__
1185 #define JNI_LIB_SUFFIX ".dylib"
1186 #else
1187 #define JNI_LIB_SUFFIX ".so"
1188 #endif
1189
1190 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1191
1192 // This must be hard coded because it's the system's temporary
1193 // directory not the java application's temp directory, ala java.io.tmpdir.
1194 #ifdef __APPLE__
1195 // macosx has a secure per-user temporary directory
1196 char temp_path_storage[PATH_MAX];
1197 const char* os::get_temp_directory() {
1198 static char *temp_path = NULL;
1199 if (temp_path == NULL) {
1200 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1201 if (pathSize == 0 || pathSize > PATH_MAX) {
1202 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1203 }
1204 temp_path = temp_path_storage;
1205 }
1206 return temp_path;
1207 }
1208 #else // __APPLE__
1209 const char* os::get_temp_directory() { return "/tmp"; }
1210 #endif // __APPLE__
1211
1212 static bool file_exists(const char* filename) {
1213 struct stat statbuf;
1214 if (filename == NULL || strlen(filename) == 0) {
1215 return false;
1216 }
1217 return os::stat(filename, &statbuf) == 0;
1218 }
1219
1220 bool os::dll_build_name(char* buffer, size_t buflen,
1221 const char* pname, const char* fname) {
1222 bool retval = false;
1223 // Copied from libhpi
1224 const size_t pnamelen = pname ? strlen(pname) : 0;
1225
1226 // Return error on buffer overflow.
1227 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1228 return retval;
1229 }
1230
1231 if (pnamelen == 0) {
1232 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1233 retval = true;
1234 } else if (strchr(pname, *os::path_separator()) != NULL) {
1235 int n;
1236 char** pelements = split_path(pname, &n);
1237 if (pelements == NULL) {
1238 return false;
1239 }
1240 for (int i = 0; i < n; i++) {
1241 // Really shouldn't be NULL, but check can't hurt
1242 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1243 continue; // skip the empty path values
1244 }
1245 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1246 pelements[i], fname);
1247 if (file_exists(buffer)) {
1248 retval = true;
1249 break;
1250 }
1251 }
1252 // release the storage
1253 for (int i = 0; i < n; i++) {
1254 if (pelements[i] != NULL) {
1255 FREE_C_HEAP_ARRAY(char, pelements[i]);
1256 }
1257 }
1258 if (pelements != NULL) {
1259 FREE_C_HEAP_ARRAY(char*, pelements);
1260 }
1261 } else {
1262 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1263 retval = true;
1264 }
1265 return retval;
1266 }
1267
1268 // check if addr is inside libjvm.so
1269 bool os::address_is_in_vm(address addr) {
1270 static address libjvm_base_addr;
1271 Dl_info dlinfo;
1272
1273 if (libjvm_base_addr == NULL) {
1274 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1275 libjvm_base_addr = (address)dlinfo.dli_fbase;
1276 }
1277 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1278 }
1279
1280 if (dladdr((void *)addr, &dlinfo) != 0) {
1281 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1282 }
1283
1284 return false;
1285 }
1286
1287
1288 #define MACH_MAXSYMLEN 256
1289
1290 bool os::dll_address_to_function_name(address addr, char *buf,
1291 int buflen, int *offset,
1292 bool demangle) {
1293 // buf is not optional, but offset is optional
1294 assert(buf != NULL, "sanity check");
1295
1296 Dl_info dlinfo;
1297 char localbuf[MACH_MAXSYMLEN];
1298
1299 if (dladdr((void*)addr, &dlinfo) != 0) {
1300 // see if we have a matching symbol
1301 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1302 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1303 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1304 }
1305 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1306 return true;
1307 }
1308 // no matching symbol so try for just file info
1309 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1310 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1311 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1312 return true;
1313 }
1314 }
1315
1316 // Handle non-dynamic manually:
1317 if (dlinfo.dli_fbase != NULL &&
1318 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1319 dlinfo.dli_fbase)) {
1320 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1321 jio_snprintf(buf, buflen, "%s", localbuf);
1322 }
1323 return true;
1324 }
1325 }
1326 buf[0] = '\0';
1327 if (offset != NULL) *offset = -1;
1328 return false;
1329 }
1330
1331 // ported from solaris version
1332 bool os::dll_address_to_library_name(address addr, char* buf,
1333 int buflen, int* offset) {
1334 // buf is not optional, but offset is optional
1335 assert(buf != NULL, "sanity check");
1336
1337 Dl_info dlinfo;
1338
1339 if (dladdr((void*)addr, &dlinfo) != 0) {
1340 if (dlinfo.dli_fname != NULL) {
1341 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1342 }
1343 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1344 *offset = addr - (address)dlinfo.dli_fbase;
1345 }
1346 return true;
1347 }
1348
1349 buf[0] = '\0';
1350 if (offset) *offset = -1;
1351 return false;
1352 }
1353
1354 // Loads .dll/.so and
1355 // in case of error it checks if .dll/.so was built for the
1356 // same architecture as Hotspot is running on
1357
1358 #ifdef __APPLE__
1359 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1360 #ifdef STATIC_BUILD
1361 return os::get_default_process_handle();
1362 #else
1363 void * result= ::dlopen(filename, RTLD_LAZY);
1364 if (result != NULL) {
1365 // Successful loading
1366 return result;
1367 }
1368
1369 // Read system error message into ebuf
1370 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1371 ebuf[ebuflen-1]='\0';
1372
1373 return NULL;
1374 #endif // STATIC_BUILD
1375 }
1376 #else
1377 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1378 #ifdef STATIC_BUILD
1379 return os::get_default_process_handle();
1380 #else
1381 void * result= ::dlopen(filename, RTLD_LAZY);
1382 if (result != NULL) {
1383 // Successful loading
1384 return result;
1385 }
1386
1387 Elf32_Ehdr elf_head;
1388
1389 // Read system error message into ebuf
1390 // It may or may not be overwritten below
1391 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1392 ebuf[ebuflen-1]='\0';
1393 int diag_msg_max_length=ebuflen-strlen(ebuf);
1394 char* diag_msg_buf=ebuf+strlen(ebuf);
1395
1396 if (diag_msg_max_length==0) {
1397 // No more space in ebuf for additional diagnostics message
1398 return NULL;
1399 }
1400
1401
1402 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1403
1404 if (file_descriptor < 0) {
1405 // Can't open library, report dlerror() message
1406 return NULL;
1407 }
1408
1409 bool failed_to_read_elf_head=
1410 (sizeof(elf_head)!=
1411 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1412
1413 ::close(file_descriptor);
1414 if (failed_to_read_elf_head) {
1415 // file i/o error - report dlerror() msg
1416 return NULL;
1417 }
1418
1419 typedef struct {
1420 Elf32_Half code; // Actual value as defined in elf.h
1421 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1422 char elf_class; // 32 or 64 bit
1423 char endianess; // MSB or LSB
1424 char* name; // String representation
1425 } arch_t;
1426
1427 #ifndef EM_486
1428 #define EM_486 6 /* Intel 80486 */
1429 #endif
1430
1431 #ifndef EM_MIPS_RS3_LE
1432 #define EM_MIPS_RS3_LE 10 /* MIPS */
1433 #endif
1434
1435 #ifndef EM_PPC64
1436 #define EM_PPC64 21 /* PowerPC64 */
1437 #endif
1438
1439 #ifndef EM_S390
1440 #define EM_S390 22 /* IBM System/390 */
1441 #endif
1442
1443 #ifndef EM_IA_64
1444 #define EM_IA_64 50 /* HP/Intel IA-64 */
1445 #endif
1446
1447 #ifndef EM_X86_64
1448 #define EM_X86_64 62 /* AMD x86-64 */
1449 #endif
1450
1451 static const arch_t arch_array[]={
1452 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1453 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1454 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1455 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1456 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1457 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1458 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1459 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1460 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1461 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1462 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1463 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1464 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1465 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1466 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1467 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1468 };
1469
1470 #if (defined IA32)
1471 static Elf32_Half running_arch_code=EM_386;
1472 #elif (defined AMD64)
1473 static Elf32_Half running_arch_code=EM_X86_64;
1474 #elif (defined IA64)
1475 static Elf32_Half running_arch_code=EM_IA_64;
1476 #elif (defined __sparc) && (defined _LP64)
1477 static Elf32_Half running_arch_code=EM_SPARCV9;
1478 #elif (defined __sparc) && (!defined _LP64)
1479 static Elf32_Half running_arch_code=EM_SPARC;
1480 #elif (defined __powerpc64__)
1481 static Elf32_Half running_arch_code=EM_PPC64;
1482 #elif (defined __powerpc__)
1483 static Elf32_Half running_arch_code=EM_PPC;
1484 #elif (defined ARM)
1485 static Elf32_Half running_arch_code=EM_ARM;
1486 #elif (defined S390)
1487 static Elf32_Half running_arch_code=EM_S390;
1488 #elif (defined ALPHA)
1489 static Elf32_Half running_arch_code=EM_ALPHA;
1490 #elif (defined MIPSEL)
1491 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1492 #elif (defined PARISC)
1493 static Elf32_Half running_arch_code=EM_PARISC;
1494 #elif (defined MIPS)
1495 static Elf32_Half running_arch_code=EM_MIPS;
1496 #elif (defined M68K)
1497 static Elf32_Half running_arch_code=EM_68K;
1498 #else
1499 #error Method os::dll_load requires that one of following is defined:\
1500 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1501 #endif
1502
1503 // Identify compatability class for VM's architecture and library's architecture
1504 // Obtain string descriptions for architectures
1505
1506 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1507 int running_arch_index=-1;
1508
1509 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1510 if (running_arch_code == arch_array[i].code) {
1511 running_arch_index = i;
1512 }
1513 if (lib_arch.code == arch_array[i].code) {
1514 lib_arch.compat_class = arch_array[i].compat_class;
1515 lib_arch.name = arch_array[i].name;
1516 }
1517 }
1518
1519 assert(running_arch_index != -1,
1520 "Didn't find running architecture code (running_arch_code) in arch_array");
1521 if (running_arch_index == -1) {
1522 // Even though running architecture detection failed
1523 // we may still continue with reporting dlerror() message
1524 return NULL;
1525 }
1526
1527 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1528 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1529 return NULL;
1530 }
1531
1532 #ifndef S390
1533 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1534 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1535 return NULL;
1536 }
1537 #endif // !S390
1538
1539 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1540 if (lib_arch.name!=NULL) {
1541 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1542 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1543 lib_arch.name, arch_array[running_arch_index].name);
1544 } else {
1545 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1546 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1547 lib_arch.code,
1548 arch_array[running_arch_index].name);
1549 }
1550 }
1551
1552 return NULL;
1553 #endif // STATIC_BUILD
1554 }
1555 #endif // !__APPLE__
1556
1557 void* os::get_default_process_handle() {
1558 #ifdef __APPLE__
1559 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1560 // to avoid finding unexpected symbols on second (or later)
1561 // loads of a library.
1562 return (void*)::dlopen(NULL, RTLD_FIRST);
1563 #else
1564 return (void*)::dlopen(NULL, RTLD_LAZY);
1565 #endif
1566 }
1567
1568 // XXX: Do we need a lock around this as per Linux?
1569 void* os::dll_lookup(void* handle, const char* name) {
1570 return dlsym(handle, name);
1571 }
1572
1573 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1574 outputStream * out = (outputStream *) param;
1575 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1576 return 0;
1577 }
1578
1579 void os::print_dll_info(outputStream *st) {
1580 st->print_cr("Dynamic libraries:");
1581 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1582 st->print_cr("Error: Cannot print dynamic libraries.");
1583 }
1584 }
1585
1586 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1587 #ifdef RTLD_DI_LINKMAP
1588 Dl_info dli;
1589 void *handle;
1590 Link_map *map;
1591 Link_map *p;
1592
1593 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1594 dli.dli_fname == NULL) {
1595 return 1;
1596 }
1597 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1598 if (handle == NULL) {
1599 return 1;
1600 }
1601 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1602 if (map == NULL) {
1603 dlclose(handle);
1604 return 1;
1605 }
1606
1607 while (map->l_prev != NULL)
1608 map = map->l_prev;
1609
1610 while (map != NULL) {
1611 // Value for top_address is returned as 0 since we don't have any information about module size
1612 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1613 dlclose(handle);
1614 return 1;
1615 }
1616 map = map->l_next;
1617 }
1618
1619 dlclose(handle);
1620 #elif defined(__APPLE__)
1621 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1622 // Value for top_address is returned as 0 since we don't have any information about module size
1623 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1624 return 1;
1625 }
1626 }
1627 return 0;
1628 #else
1629 return 1;
1630 #endif
1631 }
1632
1633 void os::get_summary_os_info(char* buf, size_t buflen) {
1634 // These buffers are small because we want this to be brief
1635 // and not use a lot of stack while generating the hs_err file.
1636 char os[100];
1637 size_t size = sizeof(os);
1638 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1639 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1640 #ifdef __APPLE__
1641 strncpy(os, "Darwin", sizeof(os));
1642 #elif __OpenBSD__
1643 strncpy(os, "OpenBSD", sizeof(os));
1644 #else
1645 strncpy(os, "BSD", sizeof(os));
1646 #endif
1647 }
1648
1649 char release[100];
1650 size = sizeof(release);
1651 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1652 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1653 // if error, leave blank
1654 strncpy(release, "", sizeof(release));
1655 }
1656 snprintf(buf, buflen, "%s %s", os, release);
1657 }
1658
1659 void os::print_os_info_brief(outputStream* st) {
1660 os::Posix::print_uname_info(st);
1661 }
1662
1663 void os::print_os_info(outputStream* st) {
1664 st->print("OS:");
1665
1666 os::Posix::print_uname_info(st);
1667
1668 os::Posix::print_rlimit_info(st);
1669
1670 os::Posix::print_load_average(st);
1671 }
1672
1673 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1674 // Nothing to do for now.
1675 }
1676
1677 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1678 unsigned int mhz;
1679 size_t size = sizeof(mhz);
1680 int mib[] = { CTL_HW, HW_CPU_FREQ };
1681 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1682 mhz = 1; // looks like an error but can be divided by
1683 } else {
1684 mhz /= 1000000; // reported in millions
1685 }
1686
1687 char model[100];
1688 size = sizeof(model);
1689 int mib_model[] = { CTL_HW, HW_MODEL };
1690 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1691 strncpy(model, cpu_arch, sizeof(model));
1692 }
1693
1694 char machine[100];
1695 size = sizeof(machine);
1696 int mib_machine[] = { CTL_HW, HW_MACHINE };
1697 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1698 strncpy(machine, "", sizeof(machine));
1699 }
1700
1701 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1702 }
1703
1704 void os::print_memory_info(outputStream* st) {
1705
1706 st->print("Memory:");
1707 st->print(" %dk page", os::vm_page_size()>>10);
1708
1709 st->print(", physical " UINT64_FORMAT "k",
1710 os::physical_memory() >> 10);
1711 st->print("(" UINT64_FORMAT "k free)",
1712 os::available_memory() >> 10);
1713 st->cr();
1714 }
1715
1716 static void print_signal_handler(outputStream* st, int sig,
1717 char* buf, size_t buflen);
1718
1719 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1720 st->print_cr("Signal Handlers:");
1721 print_signal_handler(st, SIGSEGV, buf, buflen);
1722 print_signal_handler(st, SIGBUS , buf, buflen);
1723 print_signal_handler(st, SIGFPE , buf, buflen);
1724 print_signal_handler(st, SIGPIPE, buf, buflen);
1725 print_signal_handler(st, SIGXFSZ, buf, buflen);
1726 print_signal_handler(st, SIGILL , buf, buflen);
1727 print_signal_handler(st, SR_signum, buf, buflen);
1728 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1729 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1730 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1731 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1732 }
1733
1734 static char saved_jvm_path[MAXPATHLEN] = {0};
1735
1736 // Find the full path to the current module, libjvm
1737 void os::jvm_path(char *buf, jint buflen) {
1738 // Error checking.
1739 if (buflen < MAXPATHLEN) {
1740 assert(false, "must use a large-enough buffer");
1741 buf[0] = '\0';
1742 return;
1743 }
1744 // Lazy resolve the path to current module.
1745 if (saved_jvm_path[0] != 0) {
1746 strcpy(buf, saved_jvm_path);
1747 return;
1748 }
1749
1750 char dli_fname[MAXPATHLEN];
1751 bool ret = dll_address_to_library_name(
1752 CAST_FROM_FN_PTR(address, os::jvm_path),
1753 dli_fname, sizeof(dli_fname), NULL);
1754 assert(ret, "cannot locate libjvm");
1755 char *rp = NULL;
1756 if (ret && dli_fname[0] != '\0') {
1757 rp = realpath(dli_fname, buf);
1758 }
1759 if (rp == NULL) {
1760 return;
1761 }
1762
1763 if (Arguments::sun_java_launcher_is_altjvm()) {
1764 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1765 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1766 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1767 // appears at the right place in the string, then assume we are
1768 // installed in a JDK and we're done. Otherwise, check for a
1769 // JAVA_HOME environment variable and construct a path to the JVM
1770 // being overridden.
1771
1772 const char *p = buf + strlen(buf) - 1;
1773 for (int count = 0; p > buf && count < 5; ++count) {
1774 for (--p; p > buf && *p != '/'; --p)
1775 /* empty */ ;
1776 }
1777
1778 if (strncmp(p, "/jre/lib/", 9) != 0) {
1779 // Look for JAVA_HOME in the environment.
1780 char* java_home_var = ::getenv("JAVA_HOME");
1781 if (java_home_var != NULL && java_home_var[0] != 0) {
1782 char* jrelib_p;
1783 int len;
1784
1785 // Check the current module name "libjvm"
1786 p = strrchr(buf, '/');
1787 assert(strstr(p, "/libjvm") == p, "invalid library name");
1788
1789 rp = realpath(java_home_var, buf);
1790 if (rp == NULL) {
1791 return;
1792 }
1793
1794 // determine if this is a legacy image or modules image
1795 // modules image doesn't have "jre" subdirectory
1796 len = strlen(buf);
1797 assert(len < buflen, "Ran out of buffer space");
1798 jrelib_p = buf + len;
1799
1800 // Add the appropriate library subdir
1801 snprintf(jrelib_p, buflen-len, "/jre/lib");
1802 if (0 != access(buf, F_OK)) {
1803 snprintf(jrelib_p, buflen-len, "/lib");
1804 }
1805
1806 // Add the appropriate client or server subdir
1807 len = strlen(buf);
1808 jrelib_p = buf + len;
1809 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1810 if (0 != access(buf, F_OK)) {
1811 snprintf(jrelib_p, buflen-len, "%s", "");
1812 }
1813
1814 // If the path exists within JAVA_HOME, add the JVM library name
1815 // to complete the path to JVM being overridden. Otherwise fallback
1816 // to the path to the current library.
1817 if (0 == access(buf, F_OK)) {
1818 // Use current module name "libjvm"
1819 len = strlen(buf);
1820 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1821 } else {
1822 // Fall back to path of current library
1823 rp = realpath(dli_fname, buf);
1824 if (rp == NULL) {
1825 return;
1826 }
1827 }
1828 }
1829 }
1830 }
1831
1832 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1833 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1834 }
1835
1836 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1837 // no prefix required, not even "_"
1838 }
1839
1840 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1841 // no suffix required
1842 }
1843
1844 ////////////////////////////////////////////////////////////////////////////////
1845 // sun.misc.Signal support
1846
1847 static volatile jint sigint_count = 0;
1848
1849 static void UserHandler(int sig, void *siginfo, void *context) {
1850 // 4511530 - sem_post is serialized and handled by the manager thread. When
1851 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1852 // don't want to flood the manager thread with sem_post requests.
1853 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1854 return;
1855 }
1856
1857 // Ctrl-C is pressed during error reporting, likely because the error
1858 // handler fails to abort. Let VM die immediately.
1859 if (sig == SIGINT && is_error_reported()) {
1860 os::die();
1861 }
1862
1863 os::signal_notify(sig);
1864 }
1865
1866 void* os::user_handler() {
1867 return CAST_FROM_FN_PTR(void*, UserHandler);
1868 }
1869
1870 extern "C" {
1871 typedef void (*sa_handler_t)(int);
1872 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1873 }
1874
1875 void* os::signal(int signal_number, void* handler) {
1876 struct sigaction sigAct, oldSigAct;
1877
1878 sigfillset(&(sigAct.sa_mask));
1879 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1880 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1881
1882 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1883 // -1 means registration failed
1884 return (void *)-1;
1885 }
1886
1887 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1888 }
1889
1890 void os::signal_raise(int signal_number) {
1891 ::raise(signal_number);
1892 }
1893
1894 // The following code is moved from os.cpp for making this
1895 // code platform specific, which it is by its very nature.
1896
1897 // Will be modified when max signal is changed to be dynamic
1898 int os::sigexitnum_pd() {
1899 return NSIG;
1900 }
1901
1902 // a counter for each possible signal value
1903 static volatile jint pending_signals[NSIG+1] = { 0 };
1904
1905 // Bsd(POSIX) specific hand shaking semaphore.
1906 #ifdef __APPLE__
1907 typedef semaphore_t os_semaphore_t;
1908
1909 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1910 #define SEM_WAIT(sem) semaphore_wait(sem)
1911 #define SEM_POST(sem) semaphore_signal(sem)
1912 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1913 #else
1914 typedef sem_t os_semaphore_t;
1915
1916 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1917 #define SEM_WAIT(sem) sem_wait(&sem)
1918 #define SEM_POST(sem) sem_post(&sem)
1919 #define SEM_DESTROY(sem) sem_destroy(&sem)
1920 #endif
1921
1922 #ifdef __APPLE__
1923 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
1924
1925 static const char* sem_init_strerror(kern_return_t value) {
1926 switch (value) {
1927 case KERN_INVALID_ARGUMENT: return "Invalid argument";
1928 case KERN_RESOURCE_SHORTAGE: return "Resource shortage";
1929 default: return "Unknown";
1930 }
1931 }
1932
1933 OSXSemaphore::OSXSemaphore(uint value) {
1934 kern_return_t ret = SEM_INIT(_semaphore, value);
1935
1936 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret));
1937 }
1938
1939 OSXSemaphore::~OSXSemaphore() {
1940 SEM_DESTROY(_semaphore);
1941 }
1942
1943 void OSXSemaphore::signal(uint count) {
1944 for (uint i = 0; i < count; i++) {
1945 kern_return_t ret = SEM_POST(_semaphore);
1946
1947 assert(ret == KERN_SUCCESS, "Failed to signal semaphore");
1948 }
1949 }
1950
1951 void OSXSemaphore::wait() {
1952 kern_return_t ret;
1953 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) {
1954 // Semaphore was interrupted. Retry.
1955 }
1956 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore");
1957 }
1958
1959 jlong OSXSemaphore::currenttime() {
1960 struct timeval tv;
1961 gettimeofday(&tv, NULL);
1962 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1963 }
1964
1965 bool OSXSemaphore::trywait() {
1966 return timedwait(0, 0);
1967 }
1968
1969 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) {
1970 kern_return_t kr = KERN_ABORTED;
1971 mach_timespec_t waitspec;
1972 waitspec.tv_sec = sec;
1973 waitspec.tv_nsec = nsec;
1974
1975 jlong starttime = currenttime();
1976
1977 kr = semaphore_timedwait(_semaphore, waitspec);
1978 while (kr == KERN_ABORTED) {
1979 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1980
1981 jlong current = currenttime();
1982 jlong passedtime = current - starttime;
1983
1984 if (passedtime >= totalwait) {
1985 waitspec.tv_sec = 0;
1986 waitspec.tv_nsec = 0;
1987 } else {
1988 jlong waittime = totalwait - (current - starttime);
1989 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
1990 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
1991 }
1992
1993 kr = semaphore_timedwait(_semaphore, waitspec);
1994 }
1995
1996 return kr == KERN_SUCCESS;
1997 }
1998
1999 #else
2000 // Use POSIX implementation of semaphores.
2001
2002 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2003 struct timespec ts;
2004 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2005
2006 return ts;
2007 }
2008
2009 #endif // __APPLE__
2010
2011 static os_semaphore_t sig_sem;
2012
2013 #ifdef __APPLE__
2014 static OSXSemaphore sr_semaphore;
2015 #else
2016 static PosixSemaphore sr_semaphore;
2017 #endif
2018
2019 void os::signal_init_pd() {
2020 // Initialize signal structures
2021 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2022
2023 // Initialize signal semaphore
2024 ::SEM_INIT(sig_sem, 0);
2025 }
2026
2027 void os::signal_notify(int sig) {
2028 Atomic::inc(&pending_signals[sig]);
2029 ::SEM_POST(sig_sem);
2030 }
2031
2032 static int check_pending_signals(bool wait) {
2033 Atomic::store(0, &sigint_count);
2034 for (;;) {
2035 for (int i = 0; i < NSIG + 1; i++) {
2036 jint n = pending_signals[i];
2037 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2038 return i;
2039 }
2040 }
2041 if (!wait) {
2042 return -1;
2043 }
2044 JavaThread *thread = JavaThread::current();
2045 ThreadBlockInVM tbivm(thread);
2046
2047 bool threadIsSuspended;
2048 do {
2049 thread->set_suspend_equivalent();
2050 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2051 ::SEM_WAIT(sig_sem);
2052
2053 // were we externally suspended while we were waiting?
2054 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2055 if (threadIsSuspended) {
2056 // The semaphore has been incremented, but while we were waiting
2057 // another thread suspended us. We don't want to continue running
2058 // while suspended because that would surprise the thread that
2059 // suspended us.
2060 ::SEM_POST(sig_sem);
2061
2062 thread->java_suspend_self();
2063 }
2064 } while (threadIsSuspended);
2065 }
2066 }
2067
2068 int os::signal_lookup() {
2069 return check_pending_signals(false);
2070 }
2071
2072 int os::signal_wait() {
2073 return check_pending_signals(true);
2074 }
2075
2076 ////////////////////////////////////////////////////////////////////////////////
2077 // Virtual Memory
2078
2079 int os::vm_page_size() {
2080 // Seems redundant as all get out
2081 assert(os::Bsd::page_size() != -1, "must call os::init");
2082 return os::Bsd::page_size();
2083 }
2084
2085 // Solaris allocates memory by pages.
2086 int os::vm_allocation_granularity() {
2087 assert(os::Bsd::page_size() != -1, "must call os::init");
2088 return os::Bsd::page_size();
2089 }
2090
2091 // Rationale behind this function:
2092 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2093 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2094 // samples for JITted code. Here we create private executable mapping over the code cache
2095 // and then we can use standard (well, almost, as mapping can change) way to provide
2096 // info for the reporting script by storing timestamp and location of symbol
2097 void bsd_wrap_code(char* base, size_t size) {
2098 static volatile jint cnt = 0;
2099
2100 if (!UseOprofile) {
2101 return;
2102 }
2103
2104 char buf[PATH_MAX + 1];
2105 int num = Atomic::add(1, &cnt);
2106
2107 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2108 os::get_temp_directory(), os::current_process_id(), num);
2109 unlink(buf);
2110
2111 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2112
2113 if (fd != -1) {
2114 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2115 if (rv != (off_t)-1) {
2116 if (::write(fd, "", 1) == 1) {
2117 mmap(base, size,
2118 PROT_READ|PROT_WRITE|PROT_EXEC,
2119 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2120 }
2121 }
2122 ::close(fd);
2123 unlink(buf);
2124 }
2125 }
2126
2127 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2128 int err) {
2129 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2130 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2131 os::errno_name(err), err);
2132 }
2133
2134 // NOTE: Bsd kernel does not really reserve the pages for us.
2135 // All it does is to check if there are enough free pages
2136 // left at the time of mmap(). This could be a potential
2137 // problem.
2138 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2139 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2140 #ifdef __OpenBSD__
2141 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2142 if (::mprotect(addr, size, prot) == 0) {
2143 return true;
2144 }
2145 #else
2146 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2147 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2148 if (res != (uintptr_t) MAP_FAILED) {
2149 return true;
2150 }
2151 #endif
2152
2153 // Warn about any commit errors we see in non-product builds just
2154 // in case mmap() doesn't work as described on the man page.
2155 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2156
2157 return false;
2158 }
2159
2160 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2161 bool exec) {
2162 // alignment_hint is ignored on this OS
2163 return pd_commit_memory(addr, size, exec);
2164 }
2165
2166 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2167 const char* mesg) {
2168 assert(mesg != NULL, "mesg must be specified");
2169 if (!pd_commit_memory(addr, size, exec)) {
2170 // add extra info in product mode for vm_exit_out_of_memory():
2171 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2172 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2173 }
2174 }
2175
2176 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2177 size_t alignment_hint, bool exec,
2178 const char* mesg) {
2179 // alignment_hint is ignored on this OS
2180 pd_commit_memory_or_exit(addr, size, exec, mesg);
2181 }
2182
2183 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2184 }
2185
2186 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2187 ::madvise(addr, bytes, MADV_DONTNEED);
2188 }
2189
2190 void os::numa_make_global(char *addr, size_t bytes) {
2191 }
2192
2193 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2194 }
2195
2196 bool os::numa_topology_changed() { return false; }
2197
2198 size_t os::numa_get_groups_num() {
2199 return 1;
2200 }
2201
2202 int os::numa_get_group_id() {
2203 return 0;
2204 }
2205
2206 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2207 if (size > 0) {
2208 ids[0] = 0;
2209 return 1;
2210 }
2211 return 0;
2212 }
2213
2214 bool os::get_page_info(char *start, page_info* info) {
2215 return false;
2216 }
2217
2218 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2219 return end;
2220 }
2221
2222
2223 bool os::pd_uncommit_memory(char* addr, size_t size) {
2224 #ifdef __OpenBSD__
2225 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2226 return ::mprotect(addr, size, PROT_NONE) == 0;
2227 #else
2228 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2229 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2230 return res != (uintptr_t) MAP_FAILED;
2231 #endif
2232 }
2233
2234 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2235 return os::commit_memory(addr, size, !ExecMem);
2236 }
2237
2238 // If this is a growable mapping, remove the guard pages entirely by
2239 // munmap()ping them. If not, just call uncommit_memory().
2240 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2241 return os::uncommit_memory(addr, size);
2242 }
2243
2244 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2245 // at 'requested_addr'. If there are existing memory mappings at the same
2246 // location, however, they will be overwritten. If 'fixed' is false,
2247 // 'requested_addr' is only treated as a hint, the return value may or
2248 // may not start from the requested address. Unlike Bsd mmap(), this
2249 // function returns NULL to indicate failure.
2250 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2251 char * addr;
2252 int flags;
2253
2254 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2255 if (fixed) {
2256 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2257 flags |= MAP_FIXED;
2258 }
2259
2260 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2261 // touch an uncommitted page. Otherwise, the read/write might
2262 // succeed if we have enough swap space to back the physical page.
2263 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2264 flags, -1, 0);
2265
2266 return addr == MAP_FAILED ? NULL : addr;
2267 }
2268
2269 static int anon_munmap(char * addr, size_t size) {
2270 return ::munmap(addr, size) == 0;
2271 }
2272
2273 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2274 size_t alignment_hint) {
2275 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2276 }
2277
2278 bool os::pd_release_memory(char* addr, size_t size) {
2279 return anon_munmap(addr, size);
2280 }
2281
2282 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2283 // Bsd wants the mprotect address argument to be page aligned.
2284 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
2285
2286 // According to SUSv3, mprotect() should only be used with mappings
2287 // established by mmap(), and mmap() always maps whole pages. Unaligned
2288 // 'addr' likely indicates problem in the VM (e.g. trying to change
2289 // protection of malloc'ed or statically allocated memory). Check the
2290 // caller if you hit this assert.
2291 assert(addr == bottom, "sanity check");
2292
2293 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2294 return ::mprotect(bottom, size, prot) == 0;
2295 }
2296
2297 // Set protections specified
2298 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2299 bool is_committed) {
2300 unsigned int p = 0;
2301 switch (prot) {
2302 case MEM_PROT_NONE: p = PROT_NONE; break;
2303 case MEM_PROT_READ: p = PROT_READ; break;
2304 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2305 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2306 default:
2307 ShouldNotReachHere();
2308 }
2309 // is_committed is unused.
2310 return bsd_mprotect(addr, bytes, p);
2311 }
2312
2313 bool os::guard_memory(char* addr, size_t size) {
2314 return bsd_mprotect(addr, size, PROT_NONE);
2315 }
2316
2317 bool os::unguard_memory(char* addr, size_t size) {
2318 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2319 }
2320
2321 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2322 return false;
2323 }
2324
2325 // Large page support
2326
2327 static size_t _large_page_size = 0;
2328
2329 void os::large_page_init() {
2330 }
2331
2332
2333 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2334 fatal("This code is not used or maintained.");
2335
2336 // "exec" is passed in but not used. Creating the shared image for
2337 // the code cache doesn't have an SHM_X executable permission to check.
2338 assert(UseLargePages && UseSHM, "only for SHM large pages");
2339
2340 key_t key = IPC_PRIVATE;
2341 char *addr;
2342
2343 bool warn_on_failure = UseLargePages &&
2344 (!FLAG_IS_DEFAULT(UseLargePages) ||
2345 !FLAG_IS_DEFAULT(LargePageSizeInBytes));
2346
2347 // Create a large shared memory region to attach to based on size.
2348 // Currently, size is the total size of the heap
2349 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2350 if (shmid == -1) {
2351 // Possible reasons for shmget failure:
2352 // 1. shmmax is too small for Java heap.
2353 // > check shmmax value: cat /proc/sys/kernel/shmmax
2354 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2355 // 2. not enough large page memory.
2356 // > check available large pages: cat /proc/meminfo
2357 // > increase amount of large pages:
2358 // echo new_value > /proc/sys/vm/nr_hugepages
2359 // Note 1: different Bsd may use different name for this property,
2360 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2361 // Note 2: it's possible there's enough physical memory available but
2362 // they are so fragmented after a long run that they can't
2363 // coalesce into large pages. Try to reserve large pages when
2364 // the system is still "fresh".
2365 if (warn_on_failure) {
2366 warning("Failed to reserve shared memory (errno = %d).", errno);
2367 }
2368 return NULL;
2369 }
2370
2371 // attach to the region
2372 addr = (char*)shmat(shmid, req_addr, 0);
2373 int err = errno;
2374
2375 // Remove shmid. If shmat() is successful, the actual shared memory segment
2376 // will be deleted when it's detached by shmdt() or when the process
2377 // terminates. If shmat() is not successful this will remove the shared
2378 // segment immediately.
2379 shmctl(shmid, IPC_RMID, NULL);
2380
2381 if ((intptr_t)addr == -1) {
2382 if (warn_on_failure) {
2383 warning("Failed to attach shared memory (errno = %d).", err);
2384 }
2385 return NULL;
2386 }
2387
2388 // The memory is committed
2389 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
2390
2391 return addr;
2392 }
2393
2394 bool os::release_memory_special(char* base, size_t bytes) {
2395 if (MemTracker::tracking_level() > NMT_minimal) {
2396 Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
2397 // detaching the SHM segment will also delete it, see reserve_memory_special()
2398 int rslt = shmdt(base);
2399 if (rslt == 0) {
2400 tkr.record((address)base, bytes);
2401 return true;
2402 } else {
2403 return false;
2404 }
2405 } else {
2406 return shmdt(base) == 0;
2407 }
2408 }
2409
2410 size_t os::large_page_size() {
2411 return _large_page_size;
2412 }
2413
2414 // HugeTLBFS allows application to commit large page memory on demand;
2415 // with SysV SHM the entire memory region must be allocated as shared
2416 // memory.
2417 bool os::can_commit_large_page_memory() {
2418 return UseHugeTLBFS;
2419 }
2420
2421 bool os::can_execute_large_page_memory() {
2422 return UseHugeTLBFS;
2423 }
2424
2425 // Reserve memory at an arbitrary address, only if that area is
2426 // available (and not reserved for something else).
2427
2428 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2429 const int max_tries = 10;
2430 char* base[max_tries];
2431 size_t size[max_tries];
2432 const size_t gap = 0x000000;
2433
2434 // Assert only that the size is a multiple of the page size, since
2435 // that's all that mmap requires, and since that's all we really know
2436 // about at this low abstraction level. If we need higher alignment,
2437 // we can either pass an alignment to this method or verify alignment
2438 // in one of the methods further up the call chain. See bug 5044738.
2439 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2440
2441 // Repeatedly allocate blocks until the block is allocated at the
2442 // right spot.
2443
2444 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2445 // if kernel honors the hint then we can return immediately.
2446 char * addr = anon_mmap(requested_addr, bytes, false);
2447 if (addr == requested_addr) {
2448 return requested_addr;
2449 }
2450
2451 if (addr != NULL) {
2452 // mmap() is successful but it fails to reserve at the requested address
2453 anon_munmap(addr, bytes);
2454 }
2455
2456 int i;
2457 for (i = 0; i < max_tries; ++i) {
2458 base[i] = reserve_memory(bytes);
2459
2460 if (base[i] != NULL) {
2461 // Is this the block we wanted?
2462 if (base[i] == requested_addr) {
2463 size[i] = bytes;
2464 break;
2465 }
2466
2467 // Does this overlap the block we wanted? Give back the overlapped
2468 // parts and try again.
2469
2470 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2471 if (top_overlap >= 0 && top_overlap < bytes) {
2472 unmap_memory(base[i], top_overlap);
2473 base[i] += top_overlap;
2474 size[i] = bytes - top_overlap;
2475 } else {
2476 size_t bottom_overlap = base[i] + bytes - requested_addr;
2477 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2478 unmap_memory(requested_addr, bottom_overlap);
2479 size[i] = bytes - bottom_overlap;
2480 } else {
2481 size[i] = bytes;
2482 }
2483 }
2484 }
2485 }
2486
2487 // Give back the unused reserved pieces.
2488
2489 for (int j = 0; j < i; ++j) {
2490 if (base[j] != NULL) {
2491 unmap_memory(base[j], size[j]);
2492 }
2493 }
2494
2495 if (i < max_tries) {
2496 return requested_addr;
2497 } else {
2498 return NULL;
2499 }
2500 }
2501
2502 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2503 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2504 }
2505
2506 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2507 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2508 }
2509
2510 void os::naked_short_sleep(jlong ms) {
2511 struct timespec req;
2512
2513 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2514 req.tv_sec = 0;
2515 if (ms > 0) {
2516 req.tv_nsec = (ms % 1000) * 1000000;
2517 } else {
2518 req.tv_nsec = 1;
2519 }
2520
2521 nanosleep(&req, NULL);
2522
2523 return;
2524 }
2525
2526 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2527 void os::infinite_sleep() {
2528 while (true) { // sleep forever ...
2529 ::sleep(100); // ... 100 seconds at a time
2530 }
2531 }
2532
2533 // Used to convert frequent JVM_Yield() to nops
2534 bool os::dont_yield() {
2535 return DontYieldALot;
2536 }
2537
2538 void os::naked_yield() {
2539 sched_yield();
2540 }
2541
2542 ////////////////////////////////////////////////////////////////////////////////
2543 // thread priority support
2544
2545 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2546 // only supports dynamic priority, static priority must be zero. For real-time
2547 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2548 // However, for large multi-threaded applications, SCHED_RR is not only slower
2549 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2550 // of 5 runs - Sep 2005).
2551 //
2552 // The following code actually changes the niceness of kernel-thread/LWP. It
2553 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2554 // not the entire user process, and user level threads are 1:1 mapped to kernel
2555 // threads. It has always been the case, but could change in the future. For
2556 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2557 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2558
2559 #if !defined(__APPLE__)
2560 int os::java_to_os_priority[CriticalPriority + 1] = {
2561 19, // 0 Entry should never be used
2562
2563 0, // 1 MinPriority
2564 3, // 2
2565 6, // 3
2566
2567 10, // 4
2568 15, // 5 NormPriority
2569 18, // 6
2570
2571 21, // 7
2572 25, // 8
2573 28, // 9 NearMaxPriority
2574
2575 31, // 10 MaxPriority
2576
2577 31 // 11 CriticalPriority
2578 };
2579 #else
2580 // Using Mach high-level priority assignments
2581 int os::java_to_os_priority[CriticalPriority + 1] = {
2582 0, // 0 Entry should never be used (MINPRI_USER)
2583
2584 27, // 1 MinPriority
2585 28, // 2
2586 29, // 3
2587
2588 30, // 4
2589 31, // 5 NormPriority (BASEPRI_DEFAULT)
2590 32, // 6
2591
2592 33, // 7
2593 34, // 8
2594 35, // 9 NearMaxPriority
2595
2596 36, // 10 MaxPriority
2597
2598 36 // 11 CriticalPriority
2599 };
2600 #endif
2601
2602 static int prio_init() {
2603 if (ThreadPriorityPolicy == 1) {
2604 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2605 // if effective uid is not root. Perhaps, a more elegant way of doing
2606 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2607 if (geteuid() != 0) {
2608 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2609 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2610 }
2611 ThreadPriorityPolicy = 0;
2612 }
2613 }
2614 if (UseCriticalJavaThreadPriority) {
2615 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2616 }
2617 return 0;
2618 }
2619
2620 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2621 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2622
2623 #ifdef __OpenBSD__
2624 // OpenBSD pthread_setprio starves low priority threads
2625 return OS_OK;
2626 #elif defined(__FreeBSD__)
2627 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2628 #elif defined(__APPLE__) || defined(__NetBSD__)
2629 struct sched_param sp;
2630 int policy;
2631 pthread_t self = pthread_self();
2632
2633 if (pthread_getschedparam(self, &policy, &sp) != 0) {
2634 return OS_ERR;
2635 }
2636
2637 sp.sched_priority = newpri;
2638 if (pthread_setschedparam(self, policy, &sp) != 0) {
2639 return OS_ERR;
2640 }
2641
2642 return OS_OK;
2643 #else
2644 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2645 return (ret == 0) ? OS_OK : OS_ERR;
2646 #endif
2647 }
2648
2649 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2650 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2651 *priority_ptr = java_to_os_priority[NormPriority];
2652 return OS_OK;
2653 }
2654
2655 errno = 0;
2656 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2657 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2658 #elif defined(__APPLE__) || defined(__NetBSD__)
2659 int policy;
2660 struct sched_param sp;
2661
2662 pthread_getschedparam(pthread_self(), &policy, &sp);
2663 *priority_ptr = sp.sched_priority;
2664 #else
2665 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2666 #endif
2667 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2668 }
2669
2670 // Hint to the underlying OS that a task switch would not be good.
2671 // Void return because it's a hint and can fail.
2672 void os::hint_no_preempt() {}
2673
2674 ////////////////////////////////////////////////////////////////////////////////
2675 // suspend/resume support
2676
2677 // the low-level signal-based suspend/resume support is a remnant from the
2678 // old VM-suspension that used to be for java-suspension, safepoints etc,
2679 // within hotspot. Now there is a single use-case for this:
2680 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2681 // that runs in the watcher thread.
2682 // The remaining code is greatly simplified from the more general suspension
2683 // code that used to be used.
2684 //
2685 // The protocol is quite simple:
2686 // - suspend:
2687 // - sends a signal to the target thread
2688 // - polls the suspend state of the osthread using a yield loop
2689 // - target thread signal handler (SR_handler) sets suspend state
2690 // and blocks in sigsuspend until continued
2691 // - resume:
2692 // - sets target osthread state to continue
2693 // - sends signal to end the sigsuspend loop in the SR_handler
2694 //
2695 // Note that the SR_lock plays no role in this suspend/resume protocol,
2696 // but is checked for NULL in SR_handler as a thread termination indicator.
2697
2698 static void resume_clear_context(OSThread *osthread) {
2699 osthread->set_ucontext(NULL);
2700 osthread->set_siginfo(NULL);
2701 }
2702
2703 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2704 osthread->set_ucontext(context);
2705 osthread->set_siginfo(siginfo);
2706 }
2707
2708 // Handler function invoked when a thread's execution is suspended or
2709 // resumed. We have to be careful that only async-safe functions are
2710 // called here (Note: most pthread functions are not async safe and
2711 // should be avoided.)
2712 //
2713 // Note: sigwait() is a more natural fit than sigsuspend() from an
2714 // interface point of view, but sigwait() prevents the signal hander
2715 // from being run. libpthread would get very confused by not having
2716 // its signal handlers run and prevents sigwait()'s use with the
2717 // mutex granting granting signal.
2718 //
2719 // Currently only ever called on the VMThread or JavaThread
2720 //
2721 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2722 // Save and restore errno to avoid confusing native code with EINTR
2723 // after sigsuspend.
2724 int old_errno = errno;
2725
2726 Thread* thread = Thread::current_or_null_safe();
2727 assert(thread != NULL, "Missing current thread in SR_handler");
2728
2729 // On some systems we have seen signal delivery get "stuck" until the signal
2730 // mask is changed as part of thread termination. Check that the current thread
2731 // has not already terminated (via SR_lock()) - else the following assertion
2732 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2733 // destructor has completed.
2734
2735 if (thread->SR_lock() == NULL) {
2736 return;
2737 }
2738
2739 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2740
2741 OSThread* osthread = thread->osthread();
2742
2743 os::SuspendResume::State current = osthread->sr.state();
2744 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2745 suspend_save_context(osthread, siginfo, context);
2746
2747 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2748 os::SuspendResume::State state = osthread->sr.suspended();
2749 if (state == os::SuspendResume::SR_SUSPENDED) {
2750 sigset_t suspend_set; // signals for sigsuspend()
2751
2752 // get current set of blocked signals and unblock resume signal
2753 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2754 sigdelset(&suspend_set, SR_signum);
2755
2756 sr_semaphore.signal();
2757 // wait here until we are resumed
2758 while (1) {
2759 sigsuspend(&suspend_set);
2760
2761 os::SuspendResume::State result = osthread->sr.running();
2762 if (result == os::SuspendResume::SR_RUNNING) {
2763 sr_semaphore.signal();
2764 break;
2765 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2766 ShouldNotReachHere();
2767 }
2768 }
2769
2770 } else if (state == os::SuspendResume::SR_RUNNING) {
2771 // request was cancelled, continue
2772 } else {
2773 ShouldNotReachHere();
2774 }
2775
2776 resume_clear_context(osthread);
2777 } else if (current == os::SuspendResume::SR_RUNNING) {
2778 // request was cancelled, continue
2779 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2780 // ignore
2781 } else {
2782 // ignore
2783 }
2784
2785 errno = old_errno;
2786 }
2787
2788
2789 static int SR_initialize() {
2790 struct sigaction act;
2791 char *s;
2792 // Get signal number to use for suspend/resume
2793 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2794 int sig = ::strtol(s, 0, 10);
2795 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2796 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2797 SR_signum = sig;
2798 } else {
2799 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2800 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2801 }
2802 }
2803
2804 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2805 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2806
2807 sigemptyset(&SR_sigset);
2808 sigaddset(&SR_sigset, SR_signum);
2809
2810 // Set up signal handler for suspend/resume
2811 act.sa_flags = SA_RESTART|SA_SIGINFO;
2812 act.sa_handler = (void (*)(int)) SR_handler;
2813
2814 // SR_signum is blocked by default.
2815 // 4528190 - We also need to block pthread restart signal (32 on all
2816 // supported Bsd platforms). Note that BsdThreads need to block
2817 // this signal for all threads to work properly. So we don't have
2818 // to use hard-coded signal number when setting up the mask.
2819 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2820
2821 if (sigaction(SR_signum, &act, 0) == -1) {
2822 return -1;
2823 }
2824
2825 // Save signal flag
2826 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2827 return 0;
2828 }
2829
2830 static int sr_notify(OSThread* osthread) {
2831 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2832 assert_status(status == 0, status, "pthread_kill");
2833 return status;
2834 }
2835
2836 // "Randomly" selected value for how long we want to spin
2837 // before bailing out on suspending a thread, also how often
2838 // we send a signal to a thread we want to resume
2839 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2840 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2841
2842 // returns true on success and false on error - really an error is fatal
2843 // but this seems the normal response to library errors
2844 static bool do_suspend(OSThread* osthread) {
2845 assert(osthread->sr.is_running(), "thread should be running");
2846 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2847
2848 // mark as suspended and send signal
2849 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2850 // failed to switch, state wasn't running?
2851 ShouldNotReachHere();
2852 return false;
2853 }
2854
2855 if (sr_notify(osthread) != 0) {
2856 ShouldNotReachHere();
2857 }
2858
2859 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2860 while (true) {
2861 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2862 break;
2863 } else {
2864 // timeout
2865 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2866 if (cancelled == os::SuspendResume::SR_RUNNING) {
2867 return false;
2868 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2869 // make sure that we consume the signal on the semaphore as well
2870 sr_semaphore.wait();
2871 break;
2872 } else {
2873 ShouldNotReachHere();
2874 return false;
2875 }
2876 }
2877 }
2878
2879 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2880 return true;
2881 }
2882
2883 static void do_resume(OSThread* osthread) {
2884 assert(osthread->sr.is_suspended(), "thread should be suspended");
2885 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2886
2887 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2888 // failed to switch to WAKEUP_REQUEST
2889 ShouldNotReachHere();
2890 return;
2891 }
2892
2893 while (true) {
2894 if (sr_notify(osthread) == 0) {
2895 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2896 if (osthread->sr.is_running()) {
2897 return;
2898 }
2899 }
2900 } else {
2901 ShouldNotReachHere();
2902 }
2903 }
2904
2905 guarantee(osthread->sr.is_running(), "Must be running!");
2906 }
2907
2908 ///////////////////////////////////////////////////////////////////////////////////
2909 // signal handling (except suspend/resume)
2910
2911 // This routine may be used by user applications as a "hook" to catch signals.
2912 // The user-defined signal handler must pass unrecognized signals to this
2913 // routine, and if it returns true (non-zero), then the signal handler must
2914 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2915 // routine will never retun false (zero), but instead will execute a VM panic
2916 // routine kill the process.
2917 //
2918 // If this routine returns false, it is OK to call it again. This allows
2919 // the user-defined signal handler to perform checks either before or after
2920 // the VM performs its own checks. Naturally, the user code would be making
2921 // a serious error if it tried to handle an exception (such as a null check
2922 // or breakpoint) that the VM was generating for its own correct operation.
2923 //
2924 // This routine may recognize any of the following kinds of signals:
2925 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2926 // It should be consulted by handlers for any of those signals.
2927 //
2928 // The caller of this routine must pass in the three arguments supplied
2929 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2930 // field of the structure passed to sigaction(). This routine assumes that
2931 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2932 //
2933 // Note that the VM will print warnings if it detects conflicting signal
2934 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2935 //
2936 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2937 void* ucontext,
2938 int abort_if_unrecognized);
2939
2940 void signalHandler(int sig, siginfo_t* info, void* uc) {
2941 assert(info != NULL && uc != NULL, "it must be old kernel");
2942 int orig_errno = errno; // Preserve errno value over signal handler.
2943 JVM_handle_bsd_signal(sig, info, uc, true);
2944 errno = orig_errno;
2945 }
2946
2947
2948 // This boolean allows users to forward their own non-matching signals
2949 // to JVM_handle_bsd_signal, harmlessly.
2950 bool os::Bsd::signal_handlers_are_installed = false;
2951
2952 // For signal-chaining
2953 struct sigaction sigact[NSIG];
2954 uint32_t sigs = 0;
2955 #if (32 < NSIG-1)
2956 #error "Not all signals can be encoded in sigs. Adapt its type!"
2957 #endif
2958 bool os::Bsd::libjsig_is_loaded = false;
2959 typedef struct sigaction *(*get_signal_t)(int);
2960 get_signal_t os::Bsd::get_signal_action = NULL;
2961
2962 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2963 struct sigaction *actp = NULL;
2964
2965 if (libjsig_is_loaded) {
2966 // Retrieve the old signal handler from libjsig
2967 actp = (*get_signal_action)(sig);
2968 }
2969 if (actp == NULL) {
2970 // Retrieve the preinstalled signal handler from jvm
2971 actp = get_preinstalled_handler(sig);
2972 }
2973
2974 return actp;
2975 }
2976
2977 static bool call_chained_handler(struct sigaction *actp, int sig,
2978 siginfo_t *siginfo, void *context) {
2979 // Call the old signal handler
2980 if (actp->sa_handler == SIG_DFL) {
2981 // It's more reasonable to let jvm treat it as an unexpected exception
2982 // instead of taking the default action.
2983 return false;
2984 } else if (actp->sa_handler != SIG_IGN) {
2985 if ((actp->sa_flags & SA_NODEFER) == 0) {
2986 // automaticlly block the signal
2987 sigaddset(&(actp->sa_mask), sig);
2988 }
2989
2990 sa_handler_t hand;
2991 sa_sigaction_t sa;
2992 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2993 // retrieve the chained handler
2994 if (siginfo_flag_set) {
2995 sa = actp->sa_sigaction;
2996 } else {
2997 hand = actp->sa_handler;
2998 }
2999
3000 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3001 actp->sa_handler = SIG_DFL;
3002 }
3003
3004 // try to honor the signal mask
3005 sigset_t oset;
3006 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3007
3008 // call into the chained handler
3009 if (siginfo_flag_set) {
3010 (*sa)(sig, siginfo, context);
3011 } else {
3012 (*hand)(sig);
3013 }
3014
3015 // restore the signal mask
3016 pthread_sigmask(SIG_SETMASK, &oset, 0);
3017 }
3018 // Tell jvm's signal handler the signal is taken care of.
3019 return true;
3020 }
3021
3022 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3023 bool chained = false;
3024 // signal-chaining
3025 if (UseSignalChaining) {
3026 struct sigaction *actp = get_chained_signal_action(sig);
3027 if (actp != NULL) {
3028 chained = call_chained_handler(actp, sig, siginfo, context);
3029 }
3030 }
3031 return chained;
3032 }
3033
3034 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
3035 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
3036 return &sigact[sig];
3037 }
3038 return NULL;
3039 }
3040
3041 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3042 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3043 sigact[sig] = oldAct;
3044 sigs |= (uint32_t)1 << (sig-1);
3045 }
3046
3047 // for diagnostic
3048 int sigflags[NSIG];
3049
3050 int os::Bsd::get_our_sigflags(int sig) {
3051 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3052 return sigflags[sig];
3053 }
3054
3055 void os::Bsd::set_our_sigflags(int sig, int flags) {
3056 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3057 if (sig > 0 && sig < NSIG) {
3058 sigflags[sig] = flags;
3059 }
3060 }
3061
3062 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3063 // Check for overwrite.
3064 struct sigaction oldAct;
3065 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3066
3067 void* oldhand = oldAct.sa_sigaction
3068 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3069 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3070 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3071 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3072 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3073 if (AllowUserSignalHandlers || !set_installed) {
3074 // Do not overwrite; user takes responsibility to forward to us.
3075 return;
3076 } else if (UseSignalChaining) {
3077 // save the old handler in jvm
3078 save_preinstalled_handler(sig, oldAct);
3079 // libjsig also interposes the sigaction() call below and saves the
3080 // old sigaction on it own.
3081 } else {
3082 fatal("Encountered unexpected pre-existing sigaction handler "
3083 "%#lx for signal %d.", (long)oldhand, sig);
3084 }
3085 }
3086
3087 struct sigaction sigAct;
3088 sigfillset(&(sigAct.sa_mask));
3089 sigAct.sa_handler = SIG_DFL;
3090 if (!set_installed) {
3091 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3092 } else {
3093 sigAct.sa_sigaction = signalHandler;
3094 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3095 }
3096 #ifdef __APPLE__
3097 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3098 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3099 // if the signal handler declares it will handle it on alternate stack.
3100 // Notice we only declare we will handle it on alt stack, but we are not
3101 // actually going to use real alt stack - this is just a workaround.
3102 // Please see ux_exception.c, method catch_mach_exception_raise for details
3103 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3104 if (sig == SIGSEGV) {
3105 sigAct.sa_flags |= SA_ONSTACK;
3106 }
3107 #endif
3108
3109 // Save flags, which are set by ours
3110 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3111 sigflags[sig] = sigAct.sa_flags;
3112
3113 int ret = sigaction(sig, &sigAct, &oldAct);
3114 assert(ret == 0, "check");
3115
3116 void* oldhand2 = oldAct.sa_sigaction
3117 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3118 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3119 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3120 }
3121
3122 // install signal handlers for signals that HotSpot needs to
3123 // handle in order to support Java-level exception handling.
3124
3125 void os::Bsd::install_signal_handlers() {
3126 if (!signal_handlers_are_installed) {
3127 signal_handlers_are_installed = true;
3128
3129 // signal-chaining
3130 typedef void (*signal_setting_t)();
3131 signal_setting_t begin_signal_setting = NULL;
3132 signal_setting_t end_signal_setting = NULL;
3133 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3134 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3135 if (begin_signal_setting != NULL) {
3136 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3137 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3138 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3139 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3140 libjsig_is_loaded = true;
3141 assert(UseSignalChaining, "should enable signal-chaining");
3142 }
3143 if (libjsig_is_loaded) {
3144 // Tell libjsig jvm is setting signal handlers
3145 (*begin_signal_setting)();
3146 }
3147
3148 set_signal_handler(SIGSEGV, true);
3149 set_signal_handler(SIGPIPE, true);
3150 set_signal_handler(SIGBUS, true);
3151 set_signal_handler(SIGILL, true);
3152 set_signal_handler(SIGFPE, true);
3153 set_signal_handler(SIGXFSZ, true);
3154
3155 #if defined(__APPLE__)
3156 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3157 // signals caught and handled by the JVM. To work around this, we reset the mach task
3158 // signal handler that's placed on our process by CrashReporter. This disables
3159 // CrashReporter-based reporting.
3160 //
3161 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3162 // on caught fatal signals.
3163 //
3164 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3165 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3166 // exception handling, while leaving the standard BSD signal handlers functional.
3167 kern_return_t kr;
3168 kr = task_set_exception_ports(mach_task_self(),
3169 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3170 MACH_PORT_NULL,
3171 EXCEPTION_STATE_IDENTITY,
3172 MACHINE_THREAD_STATE);
3173
3174 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3175 #endif
3176
3177 if (libjsig_is_loaded) {
3178 // Tell libjsig jvm finishes setting signal handlers
3179 (*end_signal_setting)();
3180 }
3181
3182 // We don't activate signal checker if libjsig is in place, we trust ourselves
3183 // and if UserSignalHandler is installed all bets are off
3184 if (CheckJNICalls) {
3185 if (libjsig_is_loaded) {
3186 if (PrintJNIResolving) {
3187 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3188 }
3189 check_signals = false;
3190 }
3191 if (AllowUserSignalHandlers) {
3192 if (PrintJNIResolving) {
3193 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3194 }
3195 check_signals = false;
3196 }
3197 }
3198 }
3199 }
3200
3201
3202 /////
3203 // glibc on Bsd platform uses non-documented flag
3204 // to indicate, that some special sort of signal
3205 // trampoline is used.
3206 // We will never set this flag, and we should
3207 // ignore this flag in our diagnostic
3208 #ifdef SIGNIFICANT_SIGNAL_MASK
3209 #undef SIGNIFICANT_SIGNAL_MASK
3210 #endif
3211 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3212
3213 static const char* get_signal_handler_name(address handler,
3214 char* buf, int buflen) {
3215 int offset;
3216 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3217 if (found) {
3218 // skip directory names
3219 const char *p1, *p2;
3220 p1 = buf;
3221 size_t len = strlen(os::file_separator());
3222 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3223 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3224 } else {
3225 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3226 }
3227 return buf;
3228 }
3229
3230 static void print_signal_handler(outputStream* st, int sig,
3231 char* buf, size_t buflen) {
3232 struct sigaction sa;
3233
3234 sigaction(sig, NULL, &sa);
3235
3236 // See comment for SIGNIFICANT_SIGNAL_MASK define
3237 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3238
3239 st->print("%s: ", os::exception_name(sig, buf, buflen));
3240
3241 address handler = (sa.sa_flags & SA_SIGINFO)
3242 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3243 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3244
3245 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3246 st->print("SIG_DFL");
3247 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3248 st->print("SIG_IGN");
3249 } else {
3250 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3251 }
3252
3253 st->print(", sa_mask[0]=");
3254 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3255
3256 address rh = VMError::get_resetted_sighandler(sig);
3257 // May be, handler was resetted by VMError?
3258 if (rh != NULL) {
3259 handler = rh;
3260 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3261 }
3262
3263 st->print(", sa_flags=");
3264 os::Posix::print_sa_flags(st, sa.sa_flags);
3265
3266 // Check: is it our handler?
3267 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3268 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3269 // It is our signal handler
3270 // check for flags, reset system-used one!
3271 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3272 st->print(
3273 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3274 os::Bsd::get_our_sigflags(sig));
3275 }
3276 }
3277 st->cr();
3278 }
3279
3280
3281 #define DO_SIGNAL_CHECK(sig) \
3282 do { \
3283 if (!sigismember(&check_signal_done, sig)) { \
3284 os::Bsd::check_signal_handler(sig); \
3285 } \
3286 } while (0)
3287
3288 // This method is a periodic task to check for misbehaving JNI applications
3289 // under CheckJNI, we can add any periodic checks here
3290
3291 void os::run_periodic_checks() {
3292
3293 if (check_signals == false) return;
3294
3295 // SEGV and BUS if overridden could potentially prevent
3296 // generation of hs*.log in the event of a crash, debugging
3297 // such a case can be very challenging, so we absolutely
3298 // check the following for a good measure:
3299 DO_SIGNAL_CHECK(SIGSEGV);
3300 DO_SIGNAL_CHECK(SIGILL);
3301 DO_SIGNAL_CHECK(SIGFPE);
3302 DO_SIGNAL_CHECK(SIGBUS);
3303 DO_SIGNAL_CHECK(SIGPIPE);
3304 DO_SIGNAL_CHECK(SIGXFSZ);
3305
3306
3307 // ReduceSignalUsage allows the user to override these handlers
3308 // see comments at the very top and jvm_solaris.h
3309 if (!ReduceSignalUsage) {
3310 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3311 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3312 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3313 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3314 }
3315
3316 DO_SIGNAL_CHECK(SR_signum);
3317 }
3318
3319 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3320
3321 static os_sigaction_t os_sigaction = NULL;
3322
3323 void os::Bsd::check_signal_handler(int sig) {
3324 char buf[O_BUFLEN];
3325 address jvmHandler = NULL;
3326
3327
3328 struct sigaction act;
3329 if (os_sigaction == NULL) {
3330 // only trust the default sigaction, in case it has been interposed
3331 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3332 if (os_sigaction == NULL) return;
3333 }
3334
3335 os_sigaction(sig, (struct sigaction*)NULL, &act);
3336
3337
3338 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3339
3340 address thisHandler = (act.sa_flags & SA_SIGINFO)
3341 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3342 : CAST_FROM_FN_PTR(address, act.sa_handler);
3343
3344
3345 switch (sig) {
3346 case SIGSEGV:
3347 case SIGBUS:
3348 case SIGFPE:
3349 case SIGPIPE:
3350 case SIGILL:
3351 case SIGXFSZ:
3352 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3353 break;
3354
3355 case SHUTDOWN1_SIGNAL:
3356 case SHUTDOWN2_SIGNAL:
3357 case SHUTDOWN3_SIGNAL:
3358 case BREAK_SIGNAL:
3359 jvmHandler = (address)user_handler();
3360 break;
3361
3362 default:
3363 if (sig == SR_signum) {
3364 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3365 } else {
3366 return;
3367 }
3368 break;
3369 }
3370
3371 if (thisHandler != jvmHandler) {
3372 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3373 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3374 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3375 // No need to check this sig any longer
3376 sigaddset(&check_signal_done, sig);
3377 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3378 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3379 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3380 exception_name(sig, buf, O_BUFLEN));
3381 }
3382 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3383 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3384 tty->print("expected:");
3385 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3386 tty->cr();
3387 tty->print(" found:");
3388 os::Posix::print_sa_flags(tty, act.sa_flags);
3389 tty->cr();
3390 // No need to check this sig any longer
3391 sigaddset(&check_signal_done, sig);
3392 }
3393
3394 // Dump all the signal
3395 if (sigismember(&check_signal_done, sig)) {
3396 print_signal_handlers(tty, buf, O_BUFLEN);
3397 }
3398 }
3399
3400 extern void report_error(char* file_name, int line_no, char* title,
3401 char* format, ...);
3402
3403 // this is called _before_ the most of global arguments have been parsed
3404 void os::init(void) {
3405 char dummy; // used to get a guess on initial stack address
3406 // first_hrtime = gethrtime();
3407
3408 // With BsdThreads the JavaMain thread pid (primordial thread)
3409 // is different than the pid of the java launcher thread.
3410 // So, on Bsd, the launcher thread pid is passed to the VM
3411 // via the sun.java.launcher.pid property.
3412 // Use this property instead of getpid() if it was correctly passed.
3413 // See bug 6351349.
3414 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3415
3416 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3417
3418 clock_tics_per_sec = CLK_TCK;
3419
3420 init_random(1234567);
3421
3422 ThreadCritical::initialize();
3423
3424 Bsd::set_page_size(getpagesize());
3425 if (Bsd::page_size() == -1) {
3426 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3427 }
3428 init_page_sizes((size_t) Bsd::page_size());
3429
3430 Bsd::initialize_system_info();
3431
3432 // main_thread points to the aboriginal thread
3433 Bsd::_main_thread = pthread_self();
3434
3435 Bsd::clock_init();
3436 initial_time_count = javaTimeNanos();
3437
3438 #ifdef __APPLE__
3439 // XXXDARWIN
3440 // Work around the unaligned VM callbacks in hotspot's
3441 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3442 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3443 // alignment when doing symbol lookup. To work around this, we force early
3444 // binding of all symbols now, thus binding when alignment is known-good.
3445 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3446 #endif
3447 }
3448
3449 // To install functions for atexit system call
3450 extern "C" {
3451 static void perfMemory_exit_helper() {
3452 perfMemory_exit();
3453 }
3454 }
3455
3456 // this is called _after_ the global arguments have been parsed
3457 jint os::init_2(void) {
3458 // Allocate a single page and mark it as readable for safepoint polling
3459 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3460 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page");
3461
3462 os::set_polling_page(polling_page);
3463 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
3464
3465 if (!UseMembar) {
3466 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3467 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page");
3468 os::set_memory_serialize_page(mem_serialize_page);
3469 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
3470 }
3471
3472 // initialize suspend/resume support - must do this before signal_sets_init()
3473 if (SR_initialize() != 0) {
3474 perror("SR_initialize failed");
3475 return JNI_ERR;
3476 }
3477
3478 Bsd::signal_sets_init();
3479 Bsd::install_signal_handlers();
3480
3481 // Check and sets minimum stack sizes against command line options
3482 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3483 return JNI_ERR;
3484 }
3485
3486 if (MaxFDLimit) {
3487 // set the number of file descriptors to max. print out error
3488 // if getrlimit/setrlimit fails but continue regardless.
3489 struct rlimit nbr_files;
3490 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3491 if (status != 0) {
3492 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3493 } else {
3494 nbr_files.rlim_cur = nbr_files.rlim_max;
3495
3496 #ifdef __APPLE__
3497 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3498 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3499 // be used instead
3500 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3501 #endif
3502
3503 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3504 if (status != 0) {
3505 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3506 }
3507 }
3508 }
3509
3510 // at-exit methods are called in the reverse order of their registration.
3511 // atexit functions are called on return from main or as a result of a
3512 // call to exit(3C). There can be only 32 of these functions registered
3513 // and atexit() does not set errno.
3514
3515 if (PerfAllowAtExitRegistration) {
3516 // only register atexit functions if PerfAllowAtExitRegistration is set.
3517 // atexit functions can be delayed until process exit time, which
3518 // can be problematic for embedded VM situations. Embedded VMs should
3519 // call DestroyJavaVM() to assure that VM resources are released.
3520
3521 // note: perfMemory_exit_helper atexit function may be removed in
3522 // the future if the appropriate cleanup code can be added to the
3523 // VM_Exit VMOperation's doit method.
3524 if (atexit(perfMemory_exit_helper) != 0) {
3525 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3526 }
3527 }
3528
3529 // initialize thread priority policy
3530 prio_init();
3531
3532 #ifdef __APPLE__
3533 // dynamically link to objective c gc registration
3534 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3535 if (handleLibObjc != NULL) {
3536 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3537 }
3538 #endif
3539
3540 return JNI_OK;
3541 }
3542
3543 // Mark the polling page as unreadable
3544 void os::make_polling_page_unreadable(void) {
3545 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3546 fatal("Could not disable polling page");
3547 }
3548 }
3549
3550 // Mark the polling page as readable
3551 void os::make_polling_page_readable(void) {
3552 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3553 fatal("Could not enable polling page");
3554 }
3555 }
3556
3557 int os::active_processor_count() {
3558 return _processor_count;
3559 }
3560
3561 void os::set_native_thread_name(const char *name) {
3562 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3563 // This is only supported in Snow Leopard and beyond
3564 if (name != NULL) {
3565 // Add a "Java: " prefix to the name
3566 char buf[MAXTHREADNAMESIZE];
3567 snprintf(buf, sizeof(buf), "Java: %s", name);
3568 pthread_setname_np(buf);
3569 }
3570 #endif
3571 }
3572
3573 bool os::distribute_processes(uint length, uint* distribution) {
3574 // Not yet implemented.
3575 return false;
3576 }
3577
3578 bool os::bind_to_processor(uint processor_id) {
3579 // Not yet implemented.
3580 return false;
3581 }
3582
3583 void os::SuspendedThreadTask::internal_do_task() {
3584 if (do_suspend(_thread->osthread())) {
3585 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3586 do_task(context);
3587 do_resume(_thread->osthread());
3588 }
3589 }
3590
3591 ///
3592 class PcFetcher : public os::SuspendedThreadTask {
3593 public:
3594 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3595 ExtendedPC result();
3596 protected:
3597 void do_task(const os::SuspendedThreadTaskContext& context);
3598 private:
3599 ExtendedPC _epc;
3600 };
3601
3602 ExtendedPC PcFetcher::result() {
3603 guarantee(is_done(), "task is not done yet.");
3604 return _epc;
3605 }
3606
3607 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3608 Thread* thread = context.thread();
3609 OSThread* osthread = thread->osthread();
3610 if (osthread->ucontext() != NULL) {
3611 _epc = os::Bsd::ucontext_get_pc((const ucontext_t *) context.ucontext());
3612 } else {
3613 // NULL context is unexpected, double-check this is the VMThread
3614 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3615 }
3616 }
3617
3618 // Suspends the target using the signal mechanism and then grabs the PC before
3619 // resuming the target. Used by the flat-profiler only
3620 ExtendedPC os::get_thread_pc(Thread* thread) {
3621 // Make sure that it is called by the watcher for the VMThread
3622 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3623 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3624
3625 PcFetcher fetcher(thread);
3626 fetcher.run();
3627 return fetcher.result();
3628 }
3629
3630 ////////////////////////////////////////////////////////////////////////////////
3631 // debug support
3632
3633 bool os::find(address addr, outputStream* st) {
3634 Dl_info dlinfo;
3635 memset(&dlinfo, 0, sizeof(dlinfo));
3636 if (dladdr(addr, &dlinfo) != 0) {
3637 st->print(PTR_FORMAT ": ", addr);
3638 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3639 st->print("%s+%#x", dlinfo.dli_sname,
3640 addr - (intptr_t)dlinfo.dli_saddr);
3641 } else if (dlinfo.dli_fbase != NULL) {
3642 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3643 } else {
3644 st->print("<absolute address>");
3645 }
3646 if (dlinfo.dli_fname != NULL) {
3647 st->print(" in %s", dlinfo.dli_fname);
3648 }
3649 if (dlinfo.dli_fbase != NULL) {
3650 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3651 }
3652 st->cr();
3653
3654 if (Verbose) {
3655 // decode some bytes around the PC
3656 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3657 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3658 address lowest = (address) dlinfo.dli_sname;
3659 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3660 if (begin < lowest) begin = lowest;
3661 Dl_info dlinfo2;
3662 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3663 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3664 end = (address) dlinfo2.dli_saddr;
3665 }
3666 Disassembler::decode(begin, end, st);
3667 }
3668 return true;
3669 }
3670 return false;
3671 }
3672
3673 ////////////////////////////////////////////////////////////////////////////////
3674 // misc
3675
3676 // This does not do anything on Bsd. This is basically a hook for being
3677 // able to use structured exception handling (thread-local exception filters)
3678 // on, e.g., Win32.
3679 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3680 const methodHandle& method, JavaCallArguments* args,
3681 Thread* thread) {
3682 f(value, method, args, thread);
3683 }
3684
3685 void os::print_statistics() {
3686 }
3687
3688 bool os::message_box(const char* title, const char* message) {
3689 int i;
3690 fdStream err(defaultStream::error_fd());
3691 for (i = 0; i < 78; i++) err.print_raw("=");
3692 err.cr();
3693 err.print_raw_cr(title);
3694 for (i = 0; i < 78; i++) err.print_raw("-");
3695 err.cr();
3696 err.print_raw_cr(message);
3697 for (i = 0; i < 78; i++) err.print_raw("=");
3698 err.cr();
3699
3700 char buf[16];
3701 // Prevent process from exiting upon "read error" without consuming all CPU
3702 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3703
3704 return buf[0] == 'y' || buf[0] == 'Y';
3705 }
3706
3707 int os::stat(const char *path, struct stat *sbuf) {
3708 char pathbuf[MAX_PATH];
3709 if (strlen(path) > MAX_PATH - 1) {
3710 errno = ENAMETOOLONG;
3711 return -1;
3712 }
3713 os::native_path(strcpy(pathbuf, path));
3714 return ::stat(pathbuf, sbuf);
3715 }
3716
3717 static inline struct timespec get_mtime(const char* filename) {
3718 struct stat st;
3719 int ret = os::stat(filename, &st);
3720 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
3721 #ifdef __APPLE__
3722 return st.st_mtimespec;
3723 #else
3724 return st.st_mtim;
3725 #endif
3726 }
3727
3728 int os::compare_file_modified_times(const char* file1, const char* file2) {
3729 struct timespec filetime1 = get_mtime(file1);
3730 struct timespec filetime2 = get_mtime(file2);
3731 int diff = filetime1.tv_sec - filetime2.tv_sec;
3732 if (diff == 0) {
3733 return filetime1.tv_nsec - filetime2.tv_nsec;
3734 }
3735 return diff;
3736 }
3737
3738 // Is a (classpath) directory empty?
3739 bool os::dir_is_empty(const char* path) {
3740 DIR *dir = NULL;
3741 struct dirent *ptr;
3742
3743 dir = opendir(path);
3744 if (dir == NULL) return true;
3745
3746 // Scan the directory
3747 bool result = true;
3748 char buf[sizeof(struct dirent) + MAX_PATH];
3749 while (result && (ptr = ::readdir(dir)) != NULL) {
3750 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3751 result = false;
3752 }
3753 }
3754 closedir(dir);
3755 return result;
3756 }
3757
3758 // This code originates from JDK's sysOpen and open64_w
3759 // from src/solaris/hpi/src/system_md.c
3760
3761 int os::open(const char *path, int oflag, int mode) {
3762 if (strlen(path) > MAX_PATH - 1) {
3763 errno = ENAMETOOLONG;
3764 return -1;
3765 }
3766 int fd;
3767
3768 fd = ::open(path, oflag, mode);
3769 if (fd == -1) return -1;
3770
3771 // If the open succeeded, the file might still be a directory
3772 {
3773 struct stat buf;
3774 int ret = ::fstat(fd, &buf);
3775 int st_mode = buf.st_mode;
3776
3777 if (ret != -1) {
3778 if ((st_mode & S_IFMT) == S_IFDIR) {
3779 errno = EISDIR;
3780 ::close(fd);
3781 return -1;
3782 }
3783 } else {
3784 ::close(fd);
3785 return -1;
3786 }
3787 }
3788
3789 // All file descriptors that are opened in the JVM and not
3790 // specifically destined for a subprocess should have the
3791 // close-on-exec flag set. If we don't set it, then careless 3rd
3792 // party native code might fork and exec without closing all
3793 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3794 // UNIXProcess.c), and this in turn might:
3795 //
3796 // - cause end-of-file to fail to be detected on some file
3797 // descriptors, resulting in mysterious hangs, or
3798 //
3799 // - might cause an fopen in the subprocess to fail on a system
3800 // suffering from bug 1085341.
3801 //
3802 // (Yes, the default setting of the close-on-exec flag is a Unix
3803 // design flaw)
3804 //
3805 // See:
3806 // 1085341: 32-bit stdio routines should support file descriptors >255
3807 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3808 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3809 //
3810 #ifdef FD_CLOEXEC
3811 {
3812 int flags = ::fcntl(fd, F_GETFD);
3813 if (flags != -1) {
3814 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3815 }
3816 }
3817 #endif
3818
3819 return fd;
3820 }
3821
3822
3823 // create binary file, rewriting existing file if required
3824 int os::create_binary_file(const char* path, bool rewrite_existing) {
3825 int oflags = O_WRONLY | O_CREAT;
3826 if (!rewrite_existing) {
3827 oflags |= O_EXCL;
3828 }
3829 return ::open(path, oflags, S_IREAD | S_IWRITE);
3830 }
3831
3832 // return current position of file pointer
3833 jlong os::current_file_offset(int fd) {
3834 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3835 }
3836
3837 // move file pointer to the specified offset
3838 jlong os::seek_to_file_offset(int fd, jlong offset) {
3839 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3840 }
3841
3842 // This code originates from JDK's sysAvailable
3843 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3844
3845 int os::available(int fd, jlong *bytes) {
3846 jlong cur, end;
3847 int mode;
3848 struct stat buf;
3849
3850 if (::fstat(fd, &buf) >= 0) {
3851 mode = buf.st_mode;
3852 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3853 int n;
3854 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3855 *bytes = n;
3856 return 1;
3857 }
3858 }
3859 }
3860 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3861 return 0;
3862 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3863 return 0;
3864 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3865 return 0;
3866 }
3867 *bytes = end - cur;
3868 return 1;
3869 }
3870
3871 // Map a block of memory.
3872 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3873 char *addr, size_t bytes, bool read_only,
3874 bool allow_exec) {
3875 int prot;
3876 int flags;
3877
3878 if (read_only) {
3879 prot = PROT_READ;
3880 flags = MAP_SHARED;
3881 } else {
3882 prot = PROT_READ | PROT_WRITE;
3883 flags = MAP_PRIVATE;
3884 }
3885
3886 if (allow_exec) {
3887 prot |= PROT_EXEC;
3888 }
3889
3890 if (addr != NULL) {
3891 flags |= MAP_FIXED;
3892 }
3893
3894 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3895 fd, file_offset);
3896 if (mapped_address == MAP_FAILED) {
3897 return NULL;
3898 }
3899 return mapped_address;
3900 }
3901
3902
3903 // Remap a block of memory.
3904 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3905 char *addr, size_t bytes, bool read_only,
3906 bool allow_exec) {
3907 // same as map_memory() on this OS
3908 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3909 allow_exec);
3910 }
3911
3912
3913 // Unmap a block of memory.
3914 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3915 return munmap(addr, bytes) == 0;
3916 }
3917
3918 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3919 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3920 // of a thread.
3921 //
3922 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3923 // the fast estimate available on the platform.
3924
3925 jlong os::current_thread_cpu_time() {
3926 #ifdef __APPLE__
3927 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3928 #else
3929 Unimplemented();
3930 return 0;
3931 #endif
3932 }
3933
3934 jlong os::thread_cpu_time(Thread* thread) {
3935 #ifdef __APPLE__
3936 return os::thread_cpu_time(thread, true /* user + sys */);
3937 #else
3938 Unimplemented();
3939 return 0;
3940 #endif
3941 }
3942
3943 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3944 #ifdef __APPLE__
3945 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3946 #else
3947 Unimplemented();
3948 return 0;
3949 #endif
3950 }
3951
3952 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3953 #ifdef __APPLE__
3954 struct thread_basic_info tinfo;
3955 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3956 kern_return_t kr;
3957 thread_t mach_thread;
3958
3959 mach_thread = thread->osthread()->thread_id();
3960 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3961 if (kr != KERN_SUCCESS) {
3962 return -1;
3963 }
3964
3965 if (user_sys_cpu_time) {
3966 jlong nanos;
3967 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3968 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3969 return nanos;
3970 } else {
3971 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3972 }
3973 #else
3974 Unimplemented();
3975 return 0;
3976 #endif
3977 }
3978
3979
3980 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3981 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3982 info_ptr->may_skip_backward = false; // elapsed time not wall time
3983 info_ptr->may_skip_forward = false; // elapsed time not wall time
3984 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3985 }
3986
3987 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3988 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3989 info_ptr->may_skip_backward = false; // elapsed time not wall time
3990 info_ptr->may_skip_forward = false; // elapsed time not wall time
3991 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3992 }
3993
3994 bool os::is_thread_cpu_time_supported() {
3995 #ifdef __APPLE__
3996 return true;
3997 #else
3998 return false;
3999 #endif
4000 }
4001
4002 // System loadavg support. Returns -1 if load average cannot be obtained.
4003 // Bsd doesn't yet have a (official) notion of processor sets,
4004 // so just return the system wide load average.
4005 int os::loadavg(double loadavg[], int nelem) {
4006 return ::getloadavg(loadavg, nelem);
4007 }
4008
4009 void os::pause() {
4010 char filename[MAX_PATH];
4011 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4012 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4013 } else {
4014 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4015 }
4016
4017 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4018 if (fd != -1) {
4019 struct stat buf;
4020 ::close(fd);
4021 while (::stat(filename, &buf) == 0) {
4022 (void)::poll(NULL, 0, 100);
4023 }
4024 } else {
4025 jio_fprintf(stderr,
4026 "Could not open pause file '%s', continuing immediately.\n", filename);
4027 }
4028 }
4029
4030
4031 // Refer to the comments in os_solaris.cpp park-unpark. The next two
4032 // comment paragraphs are worth repeating here:
4033 //
4034 // Assumption:
4035 // Only one parker can exist on an event, which is why we allocate
4036 // them per-thread. Multiple unparkers can coexist.
4037 //
4038 // _Event serves as a restricted-range semaphore.
4039 // -1 : thread is blocked, i.e. there is a waiter
4040 // 0 : neutral: thread is running or ready,
4041 // could have been signaled after a wait started
4042 // 1 : signaled - thread is running or ready
4043 //
4044
4045 // utility to compute the abstime argument to timedwait:
4046 // millis is the relative timeout time
4047 // abstime will be the absolute timeout time
4048 // TODO: replace compute_abstime() with unpackTime()
4049
4050 static struct timespec* compute_abstime(struct timespec* abstime,
4051 jlong millis) {
4052 if (millis < 0) millis = 0;
4053 struct timeval now;
4054 int status = gettimeofday(&now, NULL);
4055 assert(status == 0, "gettimeofday");
4056 jlong seconds = millis / 1000;
4057 millis %= 1000;
4058 if (seconds > 50000000) { // see man cond_timedwait(3T)
4059 seconds = 50000000;
4060 }
4061 abstime->tv_sec = now.tv_sec + seconds;
4062 long usec = now.tv_usec + millis * 1000;
4063 if (usec >= 1000000) {
4064 abstime->tv_sec += 1;
4065 usec -= 1000000;
4066 }
4067 abstime->tv_nsec = usec * 1000;
4068 return abstime;
4069 }
4070
4071 void os::PlatformEvent::park() { // AKA "down()"
4072 // Transitions for _Event:
4073 // -1 => -1 : illegal
4074 // 1 => 0 : pass - return immediately
4075 // 0 => -1 : block; then set _Event to 0 before returning
4076
4077 // Invariant: Only the thread associated with the Event/PlatformEvent
4078 // may call park().
4079 // TODO: assert that _Assoc != NULL or _Assoc == Self
4080 assert(_nParked == 0, "invariant");
4081
4082 int v;
4083 for (;;) {
4084 v = _Event;
4085 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4086 }
4087 guarantee(v >= 0, "invariant");
4088 if (v == 0) {
4089 // Do this the hard way by blocking ...
4090 int status = pthread_mutex_lock(_mutex);
4091 assert_status(status == 0, status, "mutex_lock");
4092 guarantee(_nParked == 0, "invariant");
4093 ++_nParked;
4094 while (_Event < 0) {
4095 status = pthread_cond_wait(_cond, _mutex);
4096 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4097 // Treat this the same as if the wait was interrupted
4098 if (status == ETIMEDOUT) { status = EINTR; }
4099 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4100 }
4101 --_nParked;
4102
4103 _Event = 0;
4104 status = pthread_mutex_unlock(_mutex);
4105 assert_status(status == 0, status, "mutex_unlock");
4106 // Paranoia to ensure our locked and lock-free paths interact
4107 // correctly with each other.
4108 OrderAccess::fence();
4109 }
4110 guarantee(_Event >= 0, "invariant");
4111 }
4112
4113 int os::PlatformEvent::park(jlong millis) {
4114 // Transitions for _Event:
4115 // -1 => -1 : illegal
4116 // 1 => 0 : pass - return immediately
4117 // 0 => -1 : block; then set _Event to 0 before returning
4118
4119 guarantee(_nParked == 0, "invariant");
4120
4121 int v;
4122 for (;;) {
4123 v = _Event;
4124 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4125 }
4126 guarantee(v >= 0, "invariant");
4127 if (v != 0) return OS_OK;
4128
4129 // We do this the hard way, by blocking the thread.
4130 // Consider enforcing a minimum timeout value.
4131 struct timespec abst;
4132 compute_abstime(&abst, millis);
4133
4134 int ret = OS_TIMEOUT;
4135 int status = pthread_mutex_lock(_mutex);
4136 assert_status(status == 0, status, "mutex_lock");
4137 guarantee(_nParked == 0, "invariant");
4138 ++_nParked;
4139
4140 // Object.wait(timo) will return because of
4141 // (a) notification
4142 // (b) timeout
4143 // (c) thread.interrupt
4144 //
4145 // Thread.interrupt and object.notify{All} both call Event::set.
4146 // That is, we treat thread.interrupt as a special case of notification.
4147 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4148 // We assume all ETIME returns are valid.
4149 //
4150 // TODO: properly differentiate simultaneous notify+interrupt.
4151 // In that case, we should propagate the notify to another waiter.
4152
4153 while (_Event < 0) {
4154 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4155 assert_status(status == 0 || status == EINTR ||
4156 status == ETIMEDOUT,
4157 status, "cond_timedwait");
4158 if (!FilterSpuriousWakeups) break; // previous semantics
4159 if (status == ETIMEDOUT) break;
4160 // We consume and ignore EINTR and spurious wakeups.
4161 }
4162 --_nParked;
4163 if (_Event >= 0) {
4164 ret = OS_OK;
4165 }
4166 _Event = 0;
4167 status = pthread_mutex_unlock(_mutex);
4168 assert_status(status == 0, status, "mutex_unlock");
4169 assert(_nParked == 0, "invariant");
4170 // Paranoia to ensure our locked and lock-free paths interact
4171 // correctly with each other.
4172 OrderAccess::fence();
4173 return ret;
4174 }
4175
4176 void os::PlatformEvent::unpark() {
4177 // Transitions for _Event:
4178 // 0 => 1 : just return
4179 // 1 => 1 : just return
4180 // -1 => either 0 or 1; must signal target thread
4181 // That is, we can safely transition _Event from -1 to either
4182 // 0 or 1.
4183 // See also: "Semaphores in Plan 9" by Mullender & Cox
4184 //
4185 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4186 // that it will take two back-to-back park() calls for the owning
4187 // thread to block. This has the benefit of forcing a spurious return
4188 // from the first park() call after an unpark() call which will help
4189 // shake out uses of park() and unpark() without condition variables.
4190
4191 if (Atomic::xchg(1, &_Event) >= 0) return;
4192
4193 // Wait for the thread associated with the event to vacate
4194 int status = pthread_mutex_lock(_mutex);
4195 assert_status(status == 0, status, "mutex_lock");
4196 int AnyWaiters = _nParked;
4197 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4198 status = pthread_mutex_unlock(_mutex);
4199 assert_status(status == 0, status, "mutex_unlock");
4200 if (AnyWaiters != 0) {
4201 // Note that we signal() *after* dropping the lock for "immortal" Events.
4202 // This is safe and avoids a common class of futile wakeups. In rare
4203 // circumstances this can cause a thread to return prematurely from
4204 // cond_{timed}wait() but the spurious wakeup is benign and the victim
4205 // will simply re-test the condition and re-park itself.
4206 // This provides particular benefit if the underlying platform does not
4207 // provide wait morphing.
4208 status = pthread_cond_signal(_cond);
4209 assert_status(status == 0, status, "cond_signal");
4210 }
4211 }
4212
4213
4214 // JSR166
4215 // -------------------------------------------------------
4216
4217 // The solaris and bsd implementations of park/unpark are fairly
4218 // conservative for now, but can be improved. They currently use a
4219 // mutex/condvar pair, plus a a count.
4220 // Park decrements count if > 0, else does a condvar wait. Unpark
4221 // sets count to 1 and signals condvar. Only one thread ever waits
4222 // on the condvar. Contention seen when trying to park implies that someone
4223 // is unparking you, so don't wait. And spurious returns are fine, so there
4224 // is no need to track notifications.
4225
4226 #define MAX_SECS 100000000
4227
4228 // This code is common to bsd and solaris and will be moved to a
4229 // common place in dolphin.
4230 //
4231 // The passed in time value is either a relative time in nanoseconds
4232 // or an absolute time in milliseconds. Either way it has to be unpacked
4233 // into suitable seconds and nanoseconds components and stored in the
4234 // given timespec structure.
4235 // Given time is a 64-bit value and the time_t used in the timespec is only
4236 // a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4237 // overflow if times way in the future are given. Further on Solaris versions
4238 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4239 // number of seconds, in abstime, is less than current_time + 100,000,000.
4240 // As it will be 28 years before "now + 100000000" will overflow we can
4241 // ignore overflow and just impose a hard-limit on seconds using the value
4242 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4243 // years from "now".
4244
4245 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4246 assert(time > 0, "convertTime");
4247
4248 struct timeval now;
4249 int status = gettimeofday(&now, NULL);
4250 assert(status == 0, "gettimeofday");
4251
4252 time_t max_secs = now.tv_sec + MAX_SECS;
4253
4254 if (isAbsolute) {
4255 jlong secs = time / 1000;
4256 if (secs > max_secs) {
4257 absTime->tv_sec = max_secs;
4258 } else {
4259 absTime->tv_sec = secs;
4260 }
4261 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4262 } else {
4263 jlong secs = time / NANOSECS_PER_SEC;
4264 if (secs >= MAX_SECS) {
4265 absTime->tv_sec = max_secs;
4266 absTime->tv_nsec = 0;
4267 } else {
4268 absTime->tv_sec = now.tv_sec + secs;
4269 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4270 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4271 absTime->tv_nsec -= NANOSECS_PER_SEC;
4272 ++absTime->tv_sec; // note: this must be <= max_secs
4273 }
4274 }
4275 }
4276 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4277 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4278 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4279 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4280 }
4281
4282 void Parker::park(bool isAbsolute, jlong time) {
4283 // Ideally we'd do something useful while spinning, such
4284 // as calling unpackTime().
4285
4286 // Optional fast-path check:
4287 // Return immediately if a permit is available.
4288 // We depend on Atomic::xchg() having full barrier semantics
4289 // since we are doing a lock-free update to _counter.
4290 if (Atomic::xchg(0, &_counter) > 0) return;
4291
4292 Thread* thread = Thread::current();
4293 assert(thread->is_Java_thread(), "Must be JavaThread");
4294 JavaThread *jt = (JavaThread *)thread;
4295
4296 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4297 // Check interrupt before trying to wait
4298 if (Thread::is_interrupted(thread, false)) {
4299 return;
4300 }
4301
4302 // Next, demultiplex/decode time arguments
4303 struct timespec absTime;
4304 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4305 return;
4306 }
4307 if (time > 0) {
4308 unpackTime(&absTime, isAbsolute, time);
4309 }
4310
4311
4312 // Enter safepoint region
4313 // Beware of deadlocks such as 6317397.
4314 // The per-thread Parker:: mutex is a classic leaf-lock.
4315 // In particular a thread must never block on the Threads_lock while
4316 // holding the Parker:: mutex. If safepoints are pending both the
4317 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4318 ThreadBlockInVM tbivm(jt);
4319
4320 // Don't wait if cannot get lock since interference arises from
4321 // unblocking. Also. check interrupt before trying wait
4322 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4323 return;
4324 }
4325
4326 int status;
4327 if (_counter > 0) { // no wait needed
4328 _counter = 0;
4329 status = pthread_mutex_unlock(_mutex);
4330 assert_status(status == 0, status, "invariant");
4331 // Paranoia to ensure our locked and lock-free paths interact
4332 // correctly with each other and Java-level accesses.
4333 OrderAccess::fence();
4334 return;
4335 }
4336
4337 #ifdef ASSERT
4338 // Don't catch signals while blocked; let the running threads have the signals.
4339 // (This allows a debugger to break into the running thread.)
4340 sigset_t oldsigs;
4341 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4342 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4343 #endif
4344
4345 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4346 jt->set_suspend_equivalent();
4347 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4348
4349 if (time == 0) {
4350 status = pthread_cond_wait(_cond, _mutex);
4351 } else {
4352 status = pthread_cond_timedwait(_cond, _mutex, &absTime);
4353 }
4354 assert_status(status == 0 || status == EINTR ||
4355 status == ETIMEDOUT,
4356 status, "cond_timedwait");
4357
4358 #ifdef ASSERT
4359 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4360 #endif
4361
4362 _counter = 0;
4363 status = pthread_mutex_unlock(_mutex);
4364 assert_status(status == 0, status, "invariant");
4365 // Paranoia to ensure our locked and lock-free paths interact
4366 // correctly with each other and Java-level accesses.
4367 OrderAccess::fence();
4368
4369 // If externally suspended while waiting, re-suspend
4370 if (jt->handle_special_suspend_equivalent_condition()) {
4371 jt->java_suspend_self();
4372 }
4373 }
4374
4375 void Parker::unpark() {
4376 int status = pthread_mutex_lock(_mutex);
4377 assert_status(status == 0, status, "invariant");
4378 const int s = _counter;
4379 _counter = 1;
4380 status = pthread_mutex_unlock(_mutex);
4381 assert_status(status == 0, status, "invariant");
4382 if (s < 1) {
4383 status = pthread_cond_signal(_cond);
4384 assert_status(status == 0, status, "invariant");
4385 }
4386 }
4387
4388
4389 // Darwin has no "environ" in a dynamic library.
4390 #ifdef __APPLE__
4391 #include <crt_externs.h>
4392 #define environ (*_NSGetEnviron())
4393 #else
4394 extern char** environ;
4395 #endif
4396
4397 // Run the specified command in a separate process. Return its exit value,
4398 // or -1 on failure (e.g. can't fork a new process).
4399 // Unlike system(), this function can be called from signal handler. It
4400 // doesn't block SIGINT et al.
4401 int os::fork_and_exec(char* cmd) {
4402 const char * argv[4] = {"sh", "-c", cmd, NULL};
4403
4404 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4405 // pthread_atfork handlers and reset pthread library. All we need is a
4406 // separate process to execve. Make a direct syscall to fork process.
4407 // On IA64 there's no fork syscall, we have to use fork() and hope for
4408 // the best...
4409 pid_t pid = fork();
4410
4411 if (pid < 0) {
4412 // fork failed
4413 return -1;
4414
4415 } else if (pid == 0) {
4416 // child process
4417
4418 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4419 // first to kill every thread on the thread list. Because this list is
4420 // not reset by fork() (see notes above), execve() will instead kill
4421 // every thread in the parent process. We know this is the only thread
4422 // in the new process, so make a system call directly.
4423 // IA64 should use normal execve() from glibc to match the glibc fork()
4424 // above.
4425 execve("/bin/sh", (char* const*)argv, environ);
4426
4427 // execve failed
4428 _exit(-1);
4429
4430 } else {
4431 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4432 // care about the actual exit code, for now.
4433
4434 int status;
4435
4436 // Wait for the child process to exit. This returns immediately if
4437 // the child has already exited. */
4438 while (waitpid(pid, &status, 0) < 0) {
4439 switch (errno) {
4440 case ECHILD: return 0;
4441 case EINTR: break;
4442 default: return -1;
4443 }
4444 }
4445
4446 if (WIFEXITED(status)) {
4447 // The child exited normally; get its exit code.
4448 return WEXITSTATUS(status);
4449 } else if (WIFSIGNALED(status)) {
4450 // The child exited because of a signal
4451 // The best value to return is 0x80 + signal number,
4452 // because that is what all Unix shells do, and because
4453 // it allows callers to distinguish between process exit and
4454 // process death by signal.
4455 return 0x80 + WTERMSIG(status);
4456 } else {
4457 // Unknown exit code; pass it through
4458 return status;
4459 }
4460 }
4461 }
4462
4463 // is_headless_jre()
4464 //
4465 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4466 // in order to report if we are running in a headless jre
4467 //
4468 // Since JDK8 xawt/libmawt.so was moved into the same directory
4469 // as libawt.so, and renamed libawt_xawt.so
4470 //
4471 bool os::is_headless_jre() {
4472 #ifdef __APPLE__
4473 // We no longer build headless-only on Mac OS X
4474 return false;
4475 #else
4476 struct stat statbuf;
4477 char buf[MAXPATHLEN];
4478 char libmawtpath[MAXPATHLEN];
4479 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4480 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4481 char *p;
4482
4483 // Get path to libjvm.so
4484 os::jvm_path(buf, sizeof(buf));
4485
4486 // Get rid of libjvm.so
4487 p = strrchr(buf, '/');
4488 if (p == NULL) {
4489 return false;
4490 } else {
4491 *p = '\0';
4492 }
4493
4494 // Get rid of client or server
4495 p = strrchr(buf, '/');
4496 if (p == NULL) {
4497 return false;
4498 } else {
4499 *p = '\0';
4500 }
4501
4502 // check xawt/libmawt.so
4503 strcpy(libmawtpath, buf);
4504 strcat(libmawtpath, xawtstr);
4505 if (::stat(libmawtpath, &statbuf) == 0) return false;
4506
4507 // check libawt_xawt.so
4508 strcpy(libmawtpath, buf);
4509 strcat(libmawtpath, new_xawtstr);
4510 if (::stat(libmawtpath, &statbuf) == 0) return false;
4511
4512 return true;
4513 #endif
4514 }
4515
4516 // Get the default path to the core file
4517 // Returns the length of the string
4518 int os::get_core_path(char* buffer, size_t bufferSize) {
4519 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
4520
4521 // Truncate if theoretical string was longer than bufferSize
4522 n = MIN2(n, (int)bufferSize);
4523
4524 return n;
4525 }
4526
4527 #ifndef PRODUCT
4528 void TestReserveMemorySpecial_test() {
4529 // No tests available for this platform
4530 }
4531 #endif
4532
4533 bool os::start_debugging(char *buf, int buflen) {
4534 int len = (int)strlen(buf);
4535 char *p = &buf[len];
4536
4537 jio_snprintf(p, buflen-len,
4538 "\n\n"
4539 "Do you want to debug the problem?\n\n"
4540 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
4541 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
4542 "Otherwise, press RETURN to abort...",
4543 os::current_process_id(), os::current_process_id(),
4544 os::current_thread_id(), os::current_thread_id());
4545
4546 bool yes = os::message_box("Unexpected Error", buf);
4547
4548 if (yes) {
4549 // yes, user asked VM to launch debugger
4550 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
4551 os::current_process_id(), os::current_process_id());
4552
4553 os::fork_and_exec(buf);
4554 yes = false;
4555 }
4556 return yes;
4557 }
4558
4559 int os::create_file_for_heap(const char* dir, size_t size) {
4560 VMError::report_and_die("Allocating object heap with backing file is not supported for BSD");
4561 return false;
4562 }
4563
4564 bool os::map_memory_to_file(char* base, size_t size, int file_desc) {
4565 VMError::report_and_die("Allocating object heap with backing file is not supported for BSD");
4566 return false;
4567 }