1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_bsd.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_bsd.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_bsd.hpp"
40 #include "prims/jniFastGetField.hpp"
41 #include "prims/jvm.h"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/osThread.hpp"
52 #include "runtime/perfMemory.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/statSampler.hpp"
55 #include "runtime/stubRoutines.hpp"
56 #include "runtime/thread.inline.hpp"
57 #include "runtime/threadCritical.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/attachListener.hpp"
60 #include "services/memTracker.hpp"
61 #include "services/runtimeService.hpp"
62 #include "utilities/decoder.hpp"
63 #include "utilities/defaultStream.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/growableArray.hpp"
66 #include "utilities/vmError.hpp"
67
68 // put OS-includes here
69 # include <sys/types.h>
70 # include <sys/mman.h>
71 # include <sys/stat.h>
72 # include <sys/select.h>
73 # include <pthread.h>
74 # include <signal.h>
75 # include <errno.h>
76 # include <dlfcn.h>
77 # include <stdio.h>
78 # include <unistd.h>
79 # include <sys/resource.h>
80 # include <pthread.h>
81 # include <sys/stat.h>
82 # include <sys/time.h>
83 # include <sys/times.h>
84 # include <sys/utsname.h>
85 # include <sys/socket.h>
86 # include <sys/wait.h>
87 # include <time.h>
88 # include <pwd.h>
89 # include <poll.h>
90 # include <semaphore.h>
91 # include <fcntl.h>
92 # include <string.h>
93 # include <sys/param.h>
94 # include <sys/sysctl.h>
95 # include <sys/ipc.h>
96 # include <sys/shm.h>
97 #ifndef __APPLE__
98 # include <link.h>
99 #endif
100 # include <stdint.h>
101 # include <inttypes.h>
102 # include <sys/ioctl.h>
103 # include <sys/syscall.h>
104
105 #if defined(__FreeBSD__) || defined(__NetBSD__)
106 # include <elf.h>
107 #endif
108
109 #ifdef __APPLE__
110 # include <mach/mach.h> // semaphore_* API
111 # include <mach-o/dyld.h>
112 # include <sys/proc_info.h>
113 # include <objc/objc-auto.h>
114 #endif
115
116 #ifndef MAP_ANONYMOUS
117 #define MAP_ANONYMOUS MAP_ANON
118 #endif
119
120 #define MAX_PATH (2 * K)
121
122 // for timer info max values which include all bits
123 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
124
125 #define LARGEPAGES_BIT (1 << 6)
126 ////////////////////////////////////////////////////////////////////////////////
127 // global variables
128 julong os::Bsd::_physical_memory = 0;
129
130
131 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
132 pthread_t os::Bsd::_main_thread;
133 int os::Bsd::_page_size = -1;
134
135 static jlong initial_time_count=0;
136
137 static int clock_tics_per_sec = 100;
138
139 // For diagnostics to print a message once. see run_periodic_checks
140 static sigset_t check_signal_done;
141 static bool check_signals = true;
142
143 static pid_t _initial_pid = 0;
144
145 /* Signal number used to suspend/resume a thread */
146
147 /* do not use any signal number less than SIGSEGV, see 4355769 */
148 static int SR_signum = SIGUSR2;
149 sigset_t SR_sigset;
150
151
152 ////////////////////////////////////////////////////////////////////////////////
153 // utility functions
154
155 static int SR_initialize();
156 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
157
158 julong os::available_memory() {
159 return Bsd::available_memory();
160 }
161
162 // available here means free
163 julong os::Bsd::available_memory() {
164 uint64_t available = physical_memory() >> 2;
165 #ifdef __APPLE__
166 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
167 vm_statistics64_data_t vmstat;
168 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
169 (host_info64_t)&vmstat, &count);
170 assert(kerr == KERN_SUCCESS,
171 "host_statistics64 failed - check mach_host_self() and count");
172 if (kerr == KERN_SUCCESS) {
173 available = vmstat.free_count * os::vm_page_size();
174 }
175 #endif
176 return available;
177 }
178
179 julong os::physical_memory() {
180 return Bsd::physical_memory();
181 }
182
183 ////////////////////////////////////////////////////////////////////////////////
184 // environment support
185
186 bool os::getenv(const char* name, char* buf, int len) {
187 const char* val = ::getenv(name);
188 if (val != NULL && strlen(val) < (size_t)len) {
189 strcpy(buf, val);
190 return true;
191 }
192 if (len > 0) buf[0] = 0; // return a null string
193 return false;
194 }
195
196
197 // Return true if user is running as root.
198
199 bool os::have_special_privileges() {
200 static bool init = false;
201 static bool privileges = false;
202 if (!init) {
203 privileges = (getuid() != geteuid()) || (getgid() != getegid());
204 init = true;
205 }
206 return privileges;
207 }
208
209
210
211 // Cpu architecture string
212 #if defined(ZERO)
213 static char cpu_arch[] = ZERO_LIBARCH;
214 #elif defined(IA64)
215 static char cpu_arch[] = "ia64";
216 #elif defined(IA32)
217 static char cpu_arch[] = "i386";
218 #elif defined(AMD64)
219 static char cpu_arch[] = "amd64";
220 #elif defined(ARM)
221 static char cpu_arch[] = "arm";
222 #elif defined(PPC32)
223 static char cpu_arch[] = "ppc";
224 #elif defined(SPARC)
225 # ifdef _LP64
226 static char cpu_arch[] = "sparcv9";
227 # else
228 static char cpu_arch[] = "sparc";
229 # endif
230 #else
231 #error Add appropriate cpu_arch setting
232 #endif
233
234 // Compiler variant
235 #ifdef COMPILER2
236 #define COMPILER_VARIANT "server"
237 #else
238 #define COMPILER_VARIANT "client"
239 #endif
240
241
242 void os::Bsd::initialize_system_info() {
243 int mib[2];
244 size_t len;
245 int cpu_val;
246 julong mem_val;
247
248 /* get processors count via hw.ncpus sysctl */
249 mib[0] = CTL_HW;
250 mib[1] = HW_NCPU;
251 len = sizeof(cpu_val);
252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
253 assert(len == sizeof(cpu_val), "unexpected data size");
254 set_processor_count(cpu_val);
255 }
256 else {
257 set_processor_count(1); // fallback
258 }
259
260 /* get physical memory via hw.memsize sysctl (hw.memsize is used
261 * since it returns a 64 bit value)
262 */
263 mib[0] = CTL_HW;
264
265 #if defined (HW_MEMSIZE) // Apple
266 mib[1] = HW_MEMSIZE;
267 #elif defined(HW_PHYSMEM) // Most of BSD
268 mib[1] = HW_PHYSMEM;
269 #elif defined(HW_REALMEM) // Old FreeBSD
270 mib[1] = HW_REALMEM;
271 #else
272 #error No ways to get physmem
273 #endif
274
275 len = sizeof(mem_val);
276 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
277 assert(len == sizeof(mem_val), "unexpected data size");
278 _physical_memory = mem_val;
279 } else {
280 _physical_memory = 256*1024*1024; // fallback (XXXBSD?)
281 }
282
283 #ifdef __OpenBSD__
284 {
285 // limit _physical_memory memory view on OpenBSD since
286 // datasize rlimit restricts us anyway.
287 struct rlimit limits;
288 getrlimit(RLIMIT_DATA, &limits);
289 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
290 }
291 #endif
292 }
293
294 #ifdef __APPLE__
295 static const char *get_home() {
296 const char *home_dir = ::getenv("HOME");
297 if ((home_dir == NULL) || (*home_dir == '\0')) {
298 struct passwd *passwd_info = getpwuid(geteuid());
299 if (passwd_info != NULL) {
300 home_dir = passwd_info->pw_dir;
301 }
302 }
303
304 return home_dir;
305 }
306 #endif
307
308 void os::init_system_properties_values() {
309 // char arch[12];
310 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
311
312 // The next steps are taken in the product version:
313 //
314 // Obtain the JAVA_HOME value from the location of libjvm.so.
315 // This library should be located at:
316 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
317 //
318 // If "/jre/lib/" appears at the right place in the path, then we
319 // assume libjvm.so is installed in a JDK and we use this path.
320 //
321 // Otherwise exit with message: "Could not create the Java virtual machine."
322 //
323 // The following extra steps are taken in the debugging version:
324 //
325 // If "/jre/lib/" does NOT appear at the right place in the path
326 // instead of exit check for $JAVA_HOME environment variable.
327 //
328 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
329 // then we append a fake suffix "hotspot/libjvm.so" to this path so
330 // it looks like libjvm.so is installed there
331 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
332 //
333 // Otherwise exit.
334 //
335 // Important note: if the location of libjvm.so changes this
336 // code needs to be changed accordingly.
337
338 // The next few definitions allow the code to be verbatim:
339 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
340 #define getenv(n) ::getenv(n)
341
342 /*
343 * See ld(1):
344 * The linker uses the following search paths to locate required
345 * shared libraries:
346 * 1: ...
347 * ...
348 * 7: The default directories, normally /lib and /usr/lib.
349 */
350 #ifndef DEFAULT_LIBPATH
351 #define DEFAULT_LIBPATH "/lib:/usr/lib"
352 #endif
353
354 #define EXTENSIONS_DIR "/lib/ext"
355 #define ENDORSED_DIR "/lib/endorsed"
356 #define REG_DIR "/usr/java/packages"
357
358 #ifdef __APPLE__
359 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
360 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
361 const char *user_home_dir = get_home();
362 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir
363 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
364 sizeof(SYS_EXTENSIONS_DIRS);
365 #endif
366
367 {
368 /* sysclasspath, java_home, dll_dir */
369 {
370 char *home_path;
371 char *dll_path;
372 char *pslash;
373 char buf[MAXPATHLEN];
374 os::jvm_path(buf, sizeof(buf));
375
376 // Found the full path to libjvm.so.
377 // Now cut the path to <java_home>/jre if we can.
378 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
379 pslash = strrchr(buf, '/');
380 if (pslash != NULL)
381 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
382 dll_path = malloc(strlen(buf) + 1);
383 if (dll_path == NULL)
384 return;
385 strcpy(dll_path, buf);
386 Arguments::set_dll_dir(dll_path);
387
388 if (pslash != NULL) {
389 pslash = strrchr(buf, '/');
390 if (pslash != NULL) {
391 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */
392 #ifndef __APPLE__
393 pslash = strrchr(buf, '/');
394 if (pslash != NULL)
395 *pslash = '\0'; /* get rid of /lib */
396 #endif
397 }
398 }
399
400 home_path = malloc(strlen(buf) + 1);
401 if (home_path == NULL)
402 return;
403 strcpy(home_path, buf);
404 Arguments::set_java_home(home_path);
405
406 if (!set_boot_path('/', ':'))
407 return;
408 }
409
410 /*
411 * Where to look for native libraries
412 *
413 * Note: Due to a legacy implementation, most of the library path
414 * is set in the launcher. This was to accomodate linking restrictions
415 * on legacy Bsd implementations (which are no longer supported).
416 * Eventually, all the library path setting will be done here.
417 *
418 * However, to prevent the proliferation of improperly built native
419 * libraries, the new path component /usr/java/packages is added here.
420 * Eventually, all the library path setting will be done here.
421 */
422 {
423 char *ld_library_path;
424
425 /*
426 * Construct the invariant part of ld_library_path. Note that the
427 * space for the colon and the trailing null are provided by the
428 * nulls included by the sizeof operator (so actually we allocate
429 * a byte more than necessary).
430 */
431 #ifdef __APPLE__
432 ld_library_path = (char *) malloc(system_ext_size);
433 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);
434 #else
435 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
436 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
437 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
438 #endif
439
440 /*
441 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It
442 * should always exist (until the legacy problem cited above is
443 * addressed).
444 */
445 #ifdef __APPLE__
446 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper
447 char *l = getenv("JAVA_LIBRARY_PATH");
448 if (l != NULL) {
449 char *t = ld_library_path;
450 /* That's +1 for the colon and +1 for the trailing '\0' */
451 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);
452 sprintf(ld_library_path, "%s:%s", l, t);
453 free(t);
454 }
455
456 char *v = getenv("DYLD_LIBRARY_PATH");
457 #else
458 char *v = getenv("LD_LIBRARY_PATH");
459 #endif
460 if (v != NULL) {
461 char *t = ld_library_path;
462 /* That's +1 for the colon and +1 for the trailing '\0' */
463 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
464 sprintf(ld_library_path, "%s:%s", v, t);
465 free(t);
466 }
467
468 #ifdef __APPLE__
469 // Apple's Java6 has "." at the beginning of java.library.path.
470 // OpenJDK on Windows has "." at the end of java.library.path.
471 // OpenJDK on Linux and Solaris don't have "." in java.library.path
472 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
473 // "." is appended to the end of java.library.path. Yes, this
474 // could cause a change in behavior, but Apple's Java6 behavior
475 // can be achieved by putting "." at the beginning of the
476 // JAVA_LIBRARY_PATH environment variable.
477 {
478 char *t = ld_library_path;
479 // that's +3 for appending ":." and the trailing '\0'
480 ld_library_path = (char *) malloc(strlen(t) + 3);
481 sprintf(ld_library_path, "%s:%s", t, ".");
482 free(t);
483 }
484 #endif
485
486 Arguments::set_library_path(ld_library_path);
487 }
488
489 /*
490 * Extensions directories.
491 *
492 * Note that the space for the colon and the trailing null are provided
493 * by the nulls included by the sizeof operator (so actually one byte more
494 * than necessary is allocated).
495 */
496 {
497 #ifdef __APPLE__
498 char *buf = malloc(strlen(Arguments::get_java_home()) +
499 sizeof(EXTENSIONS_DIR) + system_ext_size);
500 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"
501 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());
502 #else
503 char *buf = malloc(strlen(Arguments::get_java_home()) +
504 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
505 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
506 Arguments::get_java_home());
507 #endif
508
509 Arguments::set_ext_dirs(buf);
510 }
511
512 /* Endorsed standards default directory. */
513 {
514 char * buf;
515 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
516 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
517 Arguments::set_endorsed_dirs(buf);
518 }
519 }
520
521 #ifdef __APPLE__
522 #undef SYS_EXTENSIONS_DIR
523 #endif
524 #undef malloc
525 #undef getenv
526 #undef EXTENSIONS_DIR
527 #undef ENDORSED_DIR
528
529 // Done
530 return;
531 }
532
533 ////////////////////////////////////////////////////////////////////////////////
534 // breakpoint support
535
536 void os::breakpoint() {
537 BREAKPOINT;
538 }
539
540 extern "C" void breakpoint() {
541 // use debugger to set breakpoint here
542 }
543
544 ////////////////////////////////////////////////////////////////////////////////
545 // signal support
546
547 debug_only(static bool signal_sets_initialized = false);
548 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
549
550 bool os::Bsd::is_sig_ignored(int sig) {
551 struct sigaction oact;
552 sigaction(sig, (struct sigaction*)NULL, &oact);
553 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
554 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
555 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
556 return true;
557 else
558 return false;
559 }
560
561 void os::Bsd::signal_sets_init() {
562 // Should also have an assertion stating we are still single-threaded.
563 assert(!signal_sets_initialized, "Already initialized");
564 // Fill in signals that are necessarily unblocked for all threads in
565 // the VM. Currently, we unblock the following signals:
566 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
567 // by -Xrs (=ReduceSignalUsage));
568 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
569 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
570 // the dispositions or masks wrt these signals.
571 // Programs embedding the VM that want to use the above signals for their
572 // own purposes must, at this time, use the "-Xrs" option to prevent
573 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
574 // (See bug 4345157, and other related bugs).
575 // In reality, though, unblocking these signals is really a nop, since
576 // these signals are not blocked by default.
577 sigemptyset(&unblocked_sigs);
578 sigemptyset(&allowdebug_blocked_sigs);
579 sigaddset(&unblocked_sigs, SIGILL);
580 sigaddset(&unblocked_sigs, SIGSEGV);
581 sigaddset(&unblocked_sigs, SIGBUS);
582 sigaddset(&unblocked_sigs, SIGFPE);
583 sigaddset(&unblocked_sigs, SR_signum);
584
585 if (!ReduceSignalUsage) {
586 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
587 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
588 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
589 }
590 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
591 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
592 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
593 }
594 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
595 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
596 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
597 }
598 }
599 // Fill in signals that are blocked by all but the VM thread.
600 sigemptyset(&vm_sigs);
601 if (!ReduceSignalUsage)
602 sigaddset(&vm_sigs, BREAK_SIGNAL);
603 debug_only(signal_sets_initialized = true);
604
605 }
606
607 // These are signals that are unblocked while a thread is running Java.
608 // (For some reason, they get blocked by default.)
609 sigset_t* os::Bsd::unblocked_signals() {
610 assert(signal_sets_initialized, "Not initialized");
611 return &unblocked_sigs;
612 }
613
614 // These are the signals that are blocked while a (non-VM) thread is
615 // running Java. Only the VM thread handles these signals.
616 sigset_t* os::Bsd::vm_signals() {
617 assert(signal_sets_initialized, "Not initialized");
618 return &vm_sigs;
619 }
620
621 // These are signals that are blocked during cond_wait to allow debugger in
622 sigset_t* os::Bsd::allowdebug_blocked_signals() {
623 assert(signal_sets_initialized, "Not initialized");
624 return &allowdebug_blocked_sigs;
625 }
626
627 void os::Bsd::hotspot_sigmask(Thread* thread) {
628
629 //Save caller's signal mask before setting VM signal mask
630 sigset_t caller_sigmask;
631 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
632
633 OSThread* osthread = thread->osthread();
634 osthread->set_caller_sigmask(caller_sigmask);
635
636 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
637
638 if (!ReduceSignalUsage) {
639 if (thread->is_VM_thread()) {
640 // Only the VM thread handles BREAK_SIGNAL ...
641 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
642 } else {
643 // ... all other threads block BREAK_SIGNAL
644 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
645 }
646 }
647 }
648
649
650 //////////////////////////////////////////////////////////////////////////////
651 // create new thread
652
653 // check if it's safe to start a new thread
654 static bool _thread_safety_check(Thread* thread) {
655 return true;
656 }
657
658 #ifdef __APPLE__
659 // library handle for calling objc_registerThreadWithCollector()
660 // without static linking to the libobjc library
661 #define OBJC_LIB "/usr/lib/libobjc.dylib"
662 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
663 typedef void (*objc_registerThreadWithCollector_t)();
664 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
665 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
666 #endif
667
668 #ifdef __APPLE__
669 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
670 // Additional thread_id used to correlate threads in SA
671 thread_identifier_info_data_t m_ident_info;
672 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
673
674 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
675 (thread_info_t) &m_ident_info, &count);
676
677 return m_ident_info.thread_id;
678 }
679 #endif
680
681 // Thread start routine for all newly created threads
682 static void *java_start(Thread *thread) {
683 // Try to randomize the cache line index of hot stack frames.
684 // This helps when threads of the same stack traces evict each other's
685 // cache lines. The threads can be either from the same JVM instance, or
686 // from different JVM instances. The benefit is especially true for
687 // processors with hyperthreading technology.
688 static int counter = 0;
689 int pid = os::current_process_id();
690 alloca(((pid ^ counter++) & 7) * 128);
691
692 ThreadLocalStorage::set_thread(thread);
693
694 OSThread* osthread = thread->osthread();
695 Monitor* sync = osthread->startThread_lock();
696
697 // non floating stack BsdThreads needs extra check, see above
698 if (!_thread_safety_check(thread)) {
699 // notify parent thread
700 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
701 osthread->set_state(ZOMBIE);
702 sync->notify_all();
703 return NULL;
704 }
705
706 osthread->set_thread_id(os::Bsd::gettid());
707
708 #ifdef __APPLE__
709 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
710 guarantee(unique_thread_id != 0, "unique thread id was not found");
711 osthread->set_unique_thread_id(unique_thread_id);
712 #endif
713 // initialize signal mask for this thread
714 os::Bsd::hotspot_sigmask(thread);
715
716 // initialize floating point control register
717 os::Bsd::init_thread_fpu_state();
718
719 #ifdef __APPLE__
720 // register thread with objc gc
721 if (objc_registerThreadWithCollectorFunction != NULL) {
722 objc_registerThreadWithCollectorFunction();
723 }
724 #endif
725
726 // handshaking with parent thread
727 {
728 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
729
730 // notify parent thread
731 osthread->set_state(INITIALIZED);
732 sync->notify_all();
733
734 // wait until os::start_thread()
735 while (osthread->get_state() == INITIALIZED) {
736 sync->wait(Mutex::_no_safepoint_check_flag);
737 }
738 }
739
740 // call one more level start routine
741 thread->run();
742
743 return 0;
744 }
745
746 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
747 assert(thread->osthread() == NULL, "caller responsible");
748
749 // Allocate the OSThread object
750 OSThread* osthread = new OSThread(NULL, NULL);
751 if (osthread == NULL) {
752 return false;
753 }
754
755 // set the correct thread state
756 osthread->set_thread_type(thr_type);
757
758 // Initial state is ALLOCATED but not INITIALIZED
759 osthread->set_state(ALLOCATED);
760
761 thread->set_osthread(osthread);
762
763 // init thread attributes
764 pthread_attr_t attr;
765 pthread_attr_init(&attr);
766 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
767
768 // stack size
769 if (os::Bsd::supports_variable_stack_size()) {
770 // calculate stack size if it's not specified by caller
771 if (stack_size == 0) {
772 stack_size = os::Bsd::default_stack_size(thr_type);
773
774 switch (thr_type) {
775 case os::java_thread:
776 // Java threads use ThreadStackSize which default value can be
777 // changed with the flag -Xss
778 assert (JavaThread::stack_size_at_create() > 0, "this should be set");
779 stack_size = JavaThread::stack_size_at_create();
780 break;
781 case os::compiler_thread:
782 if (CompilerThreadStackSize > 0) {
783 stack_size = (size_t)(CompilerThreadStackSize * K);
784 break;
785 } // else fall through:
786 // use VMThreadStackSize if CompilerThreadStackSize is not defined
787 case os::vm_thread:
788 case os::pgc_thread:
789 case os::cgc_thread:
790 case os::watcher_thread:
791 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
792 break;
793 }
794 }
795
796 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
797 pthread_attr_setstacksize(&attr, stack_size);
798 } else {
799 // let pthread_create() pick the default value.
800 }
801
802 ThreadState state;
803
804 {
805 pthread_t tid;
806 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
807
808 pthread_attr_destroy(&attr);
809
810 if (ret != 0) {
811 if (PrintMiscellaneous && (Verbose || WizardMode)) {
812 perror("pthread_create()");
813 }
814 // Need to clean up stuff we've allocated so far
815 thread->set_osthread(NULL);
816 delete osthread;
817 return false;
818 }
819
820 // Store pthread info into the OSThread
821 osthread->set_pthread_id(tid);
822
823 // Wait until child thread is either initialized or aborted
824 {
825 Monitor* sync_with_child = osthread->startThread_lock();
826 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
827 while ((state = osthread->get_state()) == ALLOCATED) {
828 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
829 }
830 }
831
832 }
833
834 // Aborted due to thread limit being reached
835 if (state == ZOMBIE) {
836 thread->set_osthread(NULL);
837 delete osthread;
838 return false;
839 }
840
841 // The thread is returned suspended (in state INITIALIZED),
842 // and is started higher up in the call chain
843 assert(state == INITIALIZED, "race condition");
844 return true;
845 }
846
847 /////////////////////////////////////////////////////////////////////////////
848 // attach existing thread
849
850 // bootstrap the main thread
851 bool os::create_main_thread(JavaThread* thread) {
852 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
853 return create_attached_thread(thread);
854 }
855
856 bool os::create_attached_thread(JavaThread* thread) {
857 #ifdef ASSERT
858 thread->verify_not_published();
859 #endif
860
861 // Allocate the OSThread object
862 OSThread* osthread = new OSThread(NULL, NULL);
863
864 if (osthread == NULL) {
865 return false;
866 }
867
868 osthread->set_thread_id(os::Bsd::gettid());
869
870 // Store pthread info into the OSThread
871 #ifdef __APPLE__
872 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
873 guarantee(unique_thread_id != 0, "just checking");
874 osthread->set_unique_thread_id(unique_thread_id);
875 #endif
876 osthread->set_pthread_id(::pthread_self());
877
878 // initialize floating point control register
879 os::Bsd::init_thread_fpu_state();
880
881 // Initial thread state is RUNNABLE
882 osthread->set_state(RUNNABLE);
883
884 thread->set_osthread(osthread);
885
886 // initialize signal mask for this thread
887 // and save the caller's signal mask
888 os::Bsd::hotspot_sigmask(thread);
889
890 return true;
891 }
892
893 void os::pd_start_thread(Thread* thread) {
894 OSThread * osthread = thread->osthread();
895 assert(osthread->get_state() != INITIALIZED, "just checking");
896 Monitor* sync_with_child = osthread->startThread_lock();
897 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
898 sync_with_child->notify();
899 }
900
901 // Free Bsd resources related to the OSThread
902 void os::free_thread(OSThread* osthread) {
903 assert(osthread != NULL, "osthread not set");
904
905 if (Thread::current()->osthread() == osthread) {
906 // Restore caller's signal mask
907 sigset_t sigmask = osthread->caller_sigmask();
908 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
909 }
910
911 delete osthread;
912 }
913
914 //////////////////////////////////////////////////////////////////////////////
915 // thread local storage
916
917 int os::allocate_thread_local_storage() {
918 pthread_key_t key;
919 int rslt = pthread_key_create(&key, NULL);
920 assert(rslt == 0, "cannot allocate thread local storage");
921 return (int)key;
922 }
923
924 // Note: This is currently not used by VM, as we don't destroy TLS key
925 // on VM exit.
926 void os::free_thread_local_storage(int index) {
927 int rslt = pthread_key_delete((pthread_key_t)index);
928 assert(rslt == 0, "invalid index");
929 }
930
931 void os::thread_local_storage_at_put(int index, void* value) {
932 int rslt = pthread_setspecific((pthread_key_t)index, value);
933 assert(rslt == 0, "pthread_setspecific failed");
934 }
935
936 extern "C" Thread* get_thread() {
937 return ThreadLocalStorage::thread();
938 }
939
940
941 ////////////////////////////////////////////////////////////////////////////////
942 // time support
943
944 // Time since start-up in seconds to a fine granularity.
945 // Used by VMSelfDestructTimer and the MemProfiler.
946 double os::elapsedTime() {
947
948 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
949 }
950
951 jlong os::elapsed_counter() {
952 return javaTimeNanos() - initial_time_count;
953 }
954
955 jlong os::elapsed_frequency() {
956 return NANOSECS_PER_SEC; // nanosecond resolution
957 }
958
959 bool os::supports_vtime() { return true; }
960 bool os::enable_vtime() { return false; }
961 bool os::vtime_enabled() { return false; }
962
963 double os::elapsedVTime() {
964 // better than nothing, but not much
965 return elapsedTime();
966 }
967
968 jlong os::javaTimeMillis() {
969 timeval time;
970 int status = gettimeofday(&time, NULL);
971 assert(status != -1, "bsd error");
972 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
973 }
974
975 #ifndef CLOCK_MONOTONIC
976 #define CLOCK_MONOTONIC (1)
977 #endif
978
979 #ifdef __APPLE__
980 void os::Bsd::clock_init() {
981 // XXXDARWIN: Investigate replacement monotonic clock
982 }
983 #else
984 void os::Bsd::clock_init() {
985 struct timespec res;
986 struct timespec tp;
987 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
988 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
989 // yes, monotonic clock is supported
990 _clock_gettime = ::clock_gettime;
991 }
992 }
993 #endif
994
995
996 jlong os::javaTimeNanos() {
997 if (os::supports_monotonic_clock()) {
998 struct timespec tp;
999 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp);
1000 assert(status == 0, "gettime error");
1001 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
1002 return result;
1003 } else {
1004 timeval time;
1005 int status = gettimeofday(&time, NULL);
1006 assert(status != -1, "bsd error");
1007 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1008 return 1000 * usecs;
1009 }
1010 }
1011
1012 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1013 if (os::supports_monotonic_clock()) {
1014 info_ptr->max_value = ALL_64_BITS;
1015
1016 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1017 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1018 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1019 } else {
1020 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1021 info_ptr->max_value = ALL_64_BITS;
1022
1023 // gettimeofday is a real time clock so it skips
1024 info_ptr->may_skip_backward = true;
1025 info_ptr->may_skip_forward = true;
1026 }
1027
1028 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1029 }
1030
1031 // Return the real, user, and system times in seconds from an
1032 // arbitrary fixed point in the past.
1033 bool os::getTimesSecs(double* process_real_time,
1034 double* process_user_time,
1035 double* process_system_time) {
1036 struct tms ticks;
1037 clock_t real_ticks = times(&ticks);
1038
1039 if (real_ticks == (clock_t) (-1)) {
1040 return false;
1041 } else {
1042 double ticks_per_second = (double) clock_tics_per_sec;
1043 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1044 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1045 *process_real_time = ((double) real_ticks) / ticks_per_second;
1046
1047 return true;
1048 }
1049 }
1050
1051
1052 char * os::local_time_string(char *buf, size_t buflen) {
1053 struct tm t;
1054 time_t long_time;
1055 time(&long_time);
1056 localtime_r(&long_time, &t);
1057 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1058 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1059 t.tm_hour, t.tm_min, t.tm_sec);
1060 return buf;
1061 }
1062
1063 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1064 return localtime_r(clock, res);
1065 }
1066
1067 ////////////////////////////////////////////////////////////////////////////////
1068 // runtime exit support
1069
1070 // Note: os::shutdown() might be called very early during initialization, or
1071 // called from signal handler. Before adding something to os::shutdown(), make
1072 // sure it is async-safe and can handle partially initialized VM.
1073 void os::shutdown() {
1074
1075 // allow PerfMemory to attempt cleanup of any persistent resources
1076 perfMemory_exit();
1077
1078 // needs to remove object in file system
1079 AttachListener::abort();
1080
1081 // flush buffered output, finish log files
1082 ostream_abort();
1083
1084 // Check for abort hook
1085 abort_hook_t abort_hook = Arguments::abort_hook();
1086 if (abort_hook != NULL) {
1087 abort_hook();
1088 }
1089
1090 }
1091
1092 // Note: os::abort() might be called very early during initialization, or
1093 // called from signal handler. Before adding something to os::abort(), make
1094 // sure it is async-safe and can handle partially initialized VM.
1095 void os::abort(bool dump_core) {
1096 os::shutdown();
1097 if (dump_core) {
1098 #ifndef PRODUCT
1099 fdStream out(defaultStream::output_fd());
1100 out.print_raw("Current thread is ");
1101 char buf[16];
1102 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1103 out.print_raw_cr(buf);
1104 out.print_raw_cr("Dumping core ...");
1105 #endif
1106 ::abort(); // dump core
1107 }
1108
1109 ::exit(1);
1110 }
1111
1112 // Die immediately, no exit hook, no abort hook, no cleanup.
1113 void os::die() {
1114 // _exit() on BsdThreads only kills current thread
1115 ::abort();
1116 }
1117
1118 // unused on bsd for now.
1119 void os::set_error_file(const char *logfile) {}
1120
1121
1122 // This method is a copy of JDK's sysGetLastErrorString
1123 // from src/solaris/hpi/src/system_md.c
1124
1125 size_t os::lasterror(char *buf, size_t len) {
1126
1127 if (errno == 0) return 0;
1128
1129 const char *s = ::strerror(errno);
1130 size_t n = ::strlen(s);
1131 if (n >= len) {
1132 n = len - 1;
1133 }
1134 ::strncpy(buf, s, n);
1135 buf[n] = '\0';
1136 return n;
1137 }
1138
1139 // Information of current thread in variety of formats
1140 pid_t os::Bsd::gettid() {
1141 int retval = -1;
1142
1143 #ifdef __APPLE__ //XNU kernel
1144 // despite the fact mach port is actually not a thread id use it
1145 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1146 retval = ::pthread_mach_thread_np(::pthread_self());
1147 guarantee(retval != 0, "just checking");
1148 return retval;
1149
1150 #elif __FreeBSD__
1151 retval = syscall(SYS_thr_self);
1152 #elif __OpenBSD__
1153 retval = syscall(SYS_getthrid);
1154 #elif __NetBSD__
1155 retval = (pid_t) syscall(SYS__lwp_self);
1156 #endif
1157
1158 if (retval == -1) {
1159 return getpid();
1160 }
1161 }
1162
1163 intx os::current_thread_id() {
1164 #ifdef __APPLE__
1165 return (intx)::pthread_mach_thread_np(::pthread_self());
1166 #else
1167 return (intx)::pthread_self();
1168 #endif
1169 }
1170
1171 int os::current_process_id() {
1172
1173 // Under the old bsd thread library, bsd gives each thread
1174 // its own process id. Because of this each thread will return
1175 // a different pid if this method were to return the result
1176 // of getpid(2). Bsd provides no api that returns the pid
1177 // of the launcher thread for the vm. This implementation
1178 // returns a unique pid, the pid of the launcher thread
1179 // that starts the vm 'process'.
1180
1181 // Under the NPTL, getpid() returns the same pid as the
1182 // launcher thread rather than a unique pid per thread.
1183 // Use gettid() if you want the old pre NPTL behaviour.
1184
1185 // if you are looking for the result of a call to getpid() that
1186 // returns a unique pid for the calling thread, then look at the
1187 // OSThread::thread_id() method in osThread_bsd.hpp file
1188
1189 return (int)(_initial_pid ? _initial_pid : getpid());
1190 }
1191
1192 // DLL functions
1193
1194 #define JNI_LIB_PREFIX "lib"
1195 #ifdef __APPLE__
1196 #define JNI_LIB_SUFFIX ".dylib"
1197 #else
1198 #define JNI_LIB_SUFFIX ".so"
1199 #endif
1200
1201 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1202
1203 // This must be hard coded because it's the system's temporary
1204 // directory not the java application's temp directory, ala java.io.tmpdir.
1205 #ifdef __APPLE__
1206 // macosx has a secure per-user temporary directory
1207 char temp_path_storage[PATH_MAX];
1208 const char* os::get_temp_directory() {
1209 static char *temp_path = NULL;
1210 if (temp_path == NULL) {
1211 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1212 if (pathSize == 0 || pathSize > PATH_MAX) {
1213 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1214 }
1215 temp_path = temp_path_storage;
1216 }
1217 return temp_path;
1218 }
1219 #else /* __APPLE__ */
1220 const char* os::get_temp_directory() { return "/tmp"; }
1221 #endif /* __APPLE__ */
1222
1223 static bool file_exists(const char* filename) {
1224 struct stat statbuf;
1225 if (filename == NULL || strlen(filename) == 0) {
1226 return false;
1227 }
1228 return os::stat(filename, &statbuf) == 0;
1229 }
1230
1231 bool os::dll_build_name(char* buffer, size_t buflen,
1232 const char* pname, const char* fname) {
1233 bool retval = false;
1234 // Copied from libhpi
1235 const size_t pnamelen = pname ? strlen(pname) : 0;
1236
1237 // Return error on buffer overflow.
1238 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1239 return retval;
1240 }
1241
1242 if (pnamelen == 0) {
1243 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1244 retval = true;
1245 } else if (strchr(pname, *os::path_separator()) != NULL) {
1246 int n;
1247 char** pelements = split_path(pname, &n);
1248 if (pelements == NULL) {
1249 return false;
1250 }
1251 for (int i = 0 ; i < n ; i++) {
1252 // Really shouldn't be NULL, but check can't hurt
1253 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1254 continue; // skip the empty path values
1255 }
1256 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1257 pelements[i], fname);
1258 if (file_exists(buffer)) {
1259 retval = true;
1260 break;
1261 }
1262 }
1263 // release the storage
1264 for (int i = 0 ; i < n ; i++) {
1265 if (pelements[i] != NULL) {
1266 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1267 }
1268 }
1269 if (pelements != NULL) {
1270 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1271 }
1272 } else {
1273 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1274 retval = true;
1275 }
1276 return retval;
1277 }
1278
1279 // check if addr is inside libjvm.so
1280 bool os::address_is_in_vm(address addr) {
1281 static address libjvm_base_addr;
1282 Dl_info dlinfo;
1283
1284 if (libjvm_base_addr == NULL) {
1285 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1286 libjvm_base_addr = (address)dlinfo.dli_fbase;
1287 }
1288 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1289 }
1290
1291 if (dladdr((void *)addr, &dlinfo) != 0) {
1292 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1293 }
1294
1295 return false;
1296 }
1297
1298
1299 #define MACH_MAXSYMLEN 256
1300
1301 bool os::dll_address_to_function_name(address addr, char *buf,
1302 int buflen, int *offset) {
1303 // buf is not optional, but offset is optional
1304 assert(buf != NULL, "sanity check");
1305
1306 Dl_info dlinfo;
1307 char localbuf[MACH_MAXSYMLEN];
1308
1309 if (dladdr((void*)addr, &dlinfo) != 0) {
1310 // see if we have a matching symbol
1311 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1312 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1313 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1314 }
1315 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1316 return true;
1317 }
1318 // no matching symbol so try for just file info
1319 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1320 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1321 buf, buflen, offset, dlinfo.dli_fname)) {
1322 return true;
1323 }
1324 }
1325
1326 // Handle non-dynamic manually:
1327 if (dlinfo.dli_fbase != NULL &&
1328 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1329 dlinfo.dli_fbase)) {
1330 if (!Decoder::demangle(localbuf, buf, buflen)) {
1331 jio_snprintf(buf, buflen, "%s", localbuf);
1332 }
1333 return true;
1334 }
1335 }
1336 buf[0] = '\0';
1337 if (offset != NULL) *offset = -1;
1338 return false;
1339 }
1340
1341 // ported from solaris version
1342 bool os::dll_address_to_library_name(address addr, char* buf,
1343 int buflen, int* offset) {
1344 // buf is not optional, but offset is optional
1345 assert(buf != NULL, "sanity check");
1346
1347 Dl_info dlinfo;
1348
1349 if (dladdr((void*)addr, &dlinfo) != 0) {
1350 if (dlinfo.dli_fname != NULL) {
1351 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1352 }
1353 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1354 *offset = addr - (address)dlinfo.dli_fbase;
1355 }
1356 return true;
1357 }
1358
1359 buf[0] = '\0';
1360 if (offset) *offset = -1;
1361 return false;
1362 }
1363
1364 // Loads .dll/.so and
1365 // in case of error it checks if .dll/.so was built for the
1366 // same architecture as Hotspot is running on
1367
1368 #ifdef __APPLE__
1369 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1370 void * result= ::dlopen(filename, RTLD_LAZY);
1371 if (result != NULL) {
1372 // Successful loading
1373 return result;
1374 }
1375
1376 // Read system error message into ebuf
1377 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1378 ebuf[ebuflen-1]='\0';
1379
1380 return NULL;
1381 }
1382 #else
1383 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1384 {
1385 void * result= ::dlopen(filename, RTLD_LAZY);
1386 if (result != NULL) {
1387 // Successful loading
1388 return result;
1389 }
1390
1391 Elf32_Ehdr elf_head;
1392
1393 // Read system error message into ebuf
1394 // It may or may not be overwritten below
1395 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1396 ebuf[ebuflen-1]='\0';
1397 int diag_msg_max_length=ebuflen-strlen(ebuf);
1398 char* diag_msg_buf=ebuf+strlen(ebuf);
1399
1400 if (diag_msg_max_length==0) {
1401 // No more space in ebuf for additional diagnostics message
1402 return NULL;
1403 }
1404
1405
1406 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1407
1408 if (file_descriptor < 0) {
1409 // Can't open library, report dlerror() message
1410 return NULL;
1411 }
1412
1413 bool failed_to_read_elf_head=
1414 (sizeof(elf_head)!=
1415 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1416
1417 ::close(file_descriptor);
1418 if (failed_to_read_elf_head) {
1419 // file i/o error - report dlerror() msg
1420 return NULL;
1421 }
1422
1423 typedef struct {
1424 Elf32_Half code; // Actual value as defined in elf.h
1425 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1426 char elf_class; // 32 or 64 bit
1427 char endianess; // MSB or LSB
1428 char* name; // String representation
1429 } arch_t;
1430
1431 #ifndef EM_486
1432 #define EM_486 6 /* Intel 80486 */
1433 #endif
1434
1435 #ifndef EM_MIPS_RS3_LE
1436 #define EM_MIPS_RS3_LE 10 /* MIPS */
1437 #endif
1438
1439 #ifndef EM_PPC64
1440 #define EM_PPC64 21 /* PowerPC64 */
1441 #endif
1442
1443 #ifndef EM_S390
1444 #define EM_S390 22 /* IBM System/390 */
1445 #endif
1446
1447 #ifndef EM_IA_64
1448 #define EM_IA_64 50 /* HP/Intel IA-64 */
1449 #endif
1450
1451 #ifndef EM_X86_64
1452 #define EM_X86_64 62 /* AMD x86-64 */
1453 #endif
1454
1455 static const arch_t arch_array[]={
1456 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1457 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1458 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1459 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1460 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1461 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1462 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1463 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1464 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1465 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1466 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1467 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1468 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1469 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1470 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1471 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1472 };
1473
1474 #if (defined IA32)
1475 static Elf32_Half running_arch_code=EM_386;
1476 #elif (defined AMD64)
1477 static Elf32_Half running_arch_code=EM_X86_64;
1478 #elif (defined IA64)
1479 static Elf32_Half running_arch_code=EM_IA_64;
1480 #elif (defined __sparc) && (defined _LP64)
1481 static Elf32_Half running_arch_code=EM_SPARCV9;
1482 #elif (defined __sparc) && (!defined _LP64)
1483 static Elf32_Half running_arch_code=EM_SPARC;
1484 #elif (defined __powerpc64__)
1485 static Elf32_Half running_arch_code=EM_PPC64;
1486 #elif (defined __powerpc__)
1487 static Elf32_Half running_arch_code=EM_PPC;
1488 #elif (defined ARM)
1489 static Elf32_Half running_arch_code=EM_ARM;
1490 #elif (defined S390)
1491 static Elf32_Half running_arch_code=EM_S390;
1492 #elif (defined ALPHA)
1493 static Elf32_Half running_arch_code=EM_ALPHA;
1494 #elif (defined MIPSEL)
1495 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1496 #elif (defined PARISC)
1497 static Elf32_Half running_arch_code=EM_PARISC;
1498 #elif (defined MIPS)
1499 static Elf32_Half running_arch_code=EM_MIPS;
1500 #elif (defined M68K)
1501 static Elf32_Half running_arch_code=EM_68K;
1502 #else
1503 #error Method os::dll_load requires that one of following is defined:\
1504 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1505 #endif
1506
1507 // Identify compatability class for VM's architecture and library's architecture
1508 // Obtain string descriptions for architectures
1509
1510 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1511 int running_arch_index=-1;
1512
1513 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
1514 if (running_arch_code == arch_array[i].code) {
1515 running_arch_index = i;
1516 }
1517 if (lib_arch.code == arch_array[i].code) {
1518 lib_arch.compat_class = arch_array[i].compat_class;
1519 lib_arch.name = arch_array[i].name;
1520 }
1521 }
1522
1523 assert(running_arch_index != -1,
1524 "Didn't find running architecture code (running_arch_code) in arch_array");
1525 if (running_arch_index == -1) {
1526 // Even though running architecture detection failed
1527 // we may still continue with reporting dlerror() message
1528 return NULL;
1529 }
1530
1531 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1532 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1533 return NULL;
1534 }
1535
1536 #ifndef S390
1537 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1538 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1539 return NULL;
1540 }
1541 #endif // !S390
1542
1543 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1544 if ( lib_arch.name!=NULL ) {
1545 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1546 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1547 lib_arch.name, arch_array[running_arch_index].name);
1548 } else {
1549 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1550 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1551 lib_arch.code,
1552 arch_array[running_arch_index].name);
1553 }
1554 }
1555
1556 return NULL;
1557 }
1558 #endif /* !__APPLE__ */
1559
1560 void* os::get_default_process_handle() {
1561 #ifdef __APPLE__
1562 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1563 // to avoid finding unexpected symbols on second (or later)
1564 // loads of a library.
1565 return (void*)::dlopen(NULL, RTLD_FIRST);
1566 #else
1567 return (void*)::dlopen(NULL, RTLD_LAZY);
1568 #endif
1569 }
1570
1571 // XXX: Do we need a lock around this as per Linux?
1572 void* os::dll_lookup(void* handle, const char* name) {
1573 return dlsym(handle, name);
1574 }
1575
1576
1577 static bool _print_ascii_file(const char* filename, outputStream* st) {
1578 int fd = ::open(filename, O_RDONLY);
1579 if (fd == -1) {
1580 return false;
1581 }
1582
1583 char buf[32];
1584 int bytes;
1585 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1586 st->print_raw(buf, bytes);
1587 }
1588
1589 ::close(fd);
1590
1591 return true;
1592 }
1593
1594 void os::print_dll_info(outputStream *st) {
1595 st->print_cr("Dynamic libraries:");
1596 #ifdef RTLD_DI_LINKMAP
1597 Dl_info dli;
1598 void *handle;
1599 Link_map *map;
1600 Link_map *p;
1601
1602 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1603 dli.dli_fname == NULL) {
1604 st->print_cr("Error: Cannot print dynamic libraries.");
1605 return;
1606 }
1607 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1608 if (handle == NULL) {
1609 st->print_cr("Error: Cannot print dynamic libraries.");
1610 return;
1611 }
1612 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1613 if (map == NULL) {
1614 st->print_cr("Error: Cannot print dynamic libraries.");
1615 return;
1616 }
1617
1618 while (map->l_prev != NULL)
1619 map = map->l_prev;
1620
1621 while (map != NULL) {
1622 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1623 map = map->l_next;
1624 }
1625
1626 dlclose(handle);
1627 #elif defined(__APPLE__)
1628 uint32_t count;
1629 uint32_t i;
1630
1631 count = _dyld_image_count();
1632 for (i = 1; i < count; i++) {
1633 const char *name = _dyld_get_image_name(i);
1634 intptr_t slide = _dyld_get_image_vmaddr_slide(i);
1635 st->print_cr(PTR_FORMAT " \t%s", slide, name);
1636 }
1637 #else
1638 st->print_cr("Error: Cannot print dynamic libraries.");
1639 #endif
1640 }
1641
1642 void os::print_os_info_brief(outputStream* st) {
1643 st->print("Bsd");
1644
1645 os::Posix::print_uname_info(st);
1646 }
1647
1648 void os::print_os_info(outputStream* st) {
1649 st->print("OS:");
1650 st->print("Bsd");
1651
1652 os::Posix::print_uname_info(st);
1653
1654 os::Posix::print_rlimit_info(st);
1655
1656 os::Posix::print_load_average(st);
1657 }
1658
1659 void os::pd_print_cpu_info(outputStream* st) {
1660 // Nothing to do for now.
1661 }
1662
1663 void os::print_memory_info(outputStream* st) {
1664
1665 st->print("Memory:");
1666 st->print(" %dk page", os::vm_page_size()>>10);
1667
1668 st->print(", physical " UINT64_FORMAT "k",
1669 os::physical_memory() >> 10);
1670 st->print("(" UINT64_FORMAT "k free)",
1671 os::available_memory() >> 10);
1672 st->cr();
1673
1674 // meminfo
1675 st->print("\n/proc/meminfo:\n");
1676 _print_ascii_file("/proc/meminfo", st);
1677 st->cr();
1678 }
1679
1680 void os::print_siginfo(outputStream* st, void* siginfo) {
1681 const siginfo_t* si = (const siginfo_t*)siginfo;
1682
1683 os::Posix::print_siginfo_brief(st, si);
1684
1685 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
1686 UseSharedSpaces) {
1687 FileMapInfo* mapinfo = FileMapInfo::current_info();
1688 if (mapinfo->is_in_shared_space(si->si_addr)) {
1689 st->print("\n\nError accessing class data sharing archive." \
1690 " Mapped file inaccessible during execution, " \
1691 " possible disk/network problem.");
1692 }
1693 }
1694 st->cr();
1695 }
1696
1697
1698 static void print_signal_handler(outputStream* st, int sig,
1699 char* buf, size_t buflen);
1700
1701 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1702 st->print_cr("Signal Handlers:");
1703 print_signal_handler(st, SIGSEGV, buf, buflen);
1704 print_signal_handler(st, SIGBUS , buf, buflen);
1705 print_signal_handler(st, SIGFPE , buf, buflen);
1706 print_signal_handler(st, SIGPIPE, buf, buflen);
1707 print_signal_handler(st, SIGXFSZ, buf, buflen);
1708 print_signal_handler(st, SIGILL , buf, buflen);
1709 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1710 print_signal_handler(st, SR_signum, buf, buflen);
1711 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1712 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1713 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1714 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1715 }
1716
1717 static char saved_jvm_path[MAXPATHLEN] = {0};
1718
1719 // Find the full path to the current module, libjvm
1720 void os::jvm_path(char *buf, jint buflen) {
1721 // Error checking.
1722 if (buflen < MAXPATHLEN) {
1723 assert(false, "must use a large-enough buffer");
1724 buf[0] = '\0';
1725 return;
1726 }
1727 // Lazy resolve the path to current module.
1728 if (saved_jvm_path[0] != 0) {
1729 strcpy(buf, saved_jvm_path);
1730 return;
1731 }
1732
1733 char dli_fname[MAXPATHLEN];
1734 bool ret = dll_address_to_library_name(
1735 CAST_FROM_FN_PTR(address, os::jvm_path),
1736 dli_fname, sizeof(dli_fname), NULL);
1737 assert(ret, "cannot locate libjvm");
1738 char *rp = NULL;
1739 if (ret && dli_fname[0] != '\0') {
1740 rp = realpath(dli_fname, buf);
1741 }
1742 if (rp == NULL)
1743 return;
1744
1745 if (Arguments::sun_java_launcher_is_altjvm()) {
1746 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1747 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1748 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1749 // appears at the right place in the string, then assume we are
1750 // installed in a JDK and we're done. Otherwise, check for a
1751 // JAVA_HOME environment variable and construct a path to the JVM
1752 // being overridden.
1753
1754 const char *p = buf + strlen(buf) - 1;
1755 for (int count = 0; p > buf && count < 5; ++count) {
1756 for (--p; p > buf && *p != '/'; --p)
1757 /* empty */ ;
1758 }
1759
1760 if (strncmp(p, "/jre/lib/", 9) != 0) {
1761 // Look for JAVA_HOME in the environment.
1762 char* java_home_var = ::getenv("JAVA_HOME");
1763 if (java_home_var != NULL && java_home_var[0] != 0) {
1764 char* jrelib_p;
1765 int len;
1766
1767 // Check the current module name "libjvm"
1768 p = strrchr(buf, '/');
1769 assert(strstr(p, "/libjvm") == p, "invalid library name");
1770
1771 rp = realpath(java_home_var, buf);
1772 if (rp == NULL)
1773 return;
1774
1775 // determine if this is a legacy image or modules image
1776 // modules image doesn't have "jre" subdirectory
1777 len = strlen(buf);
1778 jrelib_p = buf + len;
1779
1780 // Add the appropriate library subdir
1781 snprintf(jrelib_p, buflen-len, "/jre/lib");
1782 if (0 != access(buf, F_OK)) {
1783 snprintf(jrelib_p, buflen-len, "/lib");
1784 }
1785
1786 // Add the appropriate client or server subdir
1787 len = strlen(buf);
1788 jrelib_p = buf + len;
1789 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1790 if (0 != access(buf, F_OK)) {
1791 snprintf(jrelib_p, buflen-len, "%s", "");
1792 }
1793
1794 // If the path exists within JAVA_HOME, add the JVM library name
1795 // to complete the path to JVM being overridden. Otherwise fallback
1796 // to the path to the current library.
1797 if (0 == access(buf, F_OK)) {
1798 // Use current module name "libjvm"
1799 len = strlen(buf);
1800 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1801 } else {
1802 // Fall back to path of current library
1803 rp = realpath(dli_fname, buf);
1804 if (rp == NULL)
1805 return;
1806 }
1807 }
1808 }
1809 }
1810
1811 strcpy(saved_jvm_path, buf);
1812 }
1813
1814 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1815 // no prefix required, not even "_"
1816 }
1817
1818 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1819 // no suffix required
1820 }
1821
1822 ////////////////////////////////////////////////////////////////////////////////
1823 // sun.misc.Signal support
1824
1825 static volatile jint sigint_count = 0;
1826
1827 static void
1828 UserHandler(int sig, void *siginfo, void *context) {
1829 // 4511530 - sem_post is serialized and handled by the manager thread. When
1830 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1831 // don't want to flood the manager thread with sem_post requests.
1832 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1833 return;
1834
1835 // Ctrl-C is pressed during error reporting, likely because the error
1836 // handler fails to abort. Let VM die immediately.
1837 if (sig == SIGINT && is_error_reported()) {
1838 os::die();
1839 }
1840
1841 os::signal_notify(sig);
1842 }
1843
1844 void* os::user_handler() {
1845 return CAST_FROM_FN_PTR(void*, UserHandler);
1846 }
1847
1848 extern "C" {
1849 typedef void (*sa_handler_t)(int);
1850 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1851 }
1852
1853 void* os::signal(int signal_number, void* handler) {
1854 struct sigaction sigAct, oldSigAct;
1855
1856 sigfillset(&(sigAct.sa_mask));
1857 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1858 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1859
1860 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1861 // -1 means registration failed
1862 return (void *)-1;
1863 }
1864
1865 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1866 }
1867
1868 void os::signal_raise(int signal_number) {
1869 ::raise(signal_number);
1870 }
1871
1872 /*
1873 * The following code is moved from os.cpp for making this
1874 * code platform specific, which it is by its very nature.
1875 */
1876
1877 // Will be modified when max signal is changed to be dynamic
1878 int os::sigexitnum_pd() {
1879 return NSIG;
1880 }
1881
1882 // a counter for each possible signal value
1883 static volatile jint pending_signals[NSIG+1] = { 0 };
1884
1885 // Bsd(POSIX) specific hand shaking semaphore.
1886 #ifdef __APPLE__
1887 typedef semaphore_t os_semaphore_t;
1888 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1889 #define SEM_WAIT(sem) semaphore_wait(sem)
1890 #define SEM_POST(sem) semaphore_signal(sem)
1891 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1892 #else
1893 typedef sem_t os_semaphore_t;
1894 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1895 #define SEM_WAIT(sem) sem_wait(&sem)
1896 #define SEM_POST(sem) sem_post(&sem)
1897 #define SEM_DESTROY(sem) sem_destroy(&sem)
1898 #endif
1899
1900 class Semaphore : public StackObj {
1901 public:
1902 Semaphore();
1903 ~Semaphore();
1904 void signal();
1905 void wait();
1906 bool trywait();
1907 bool timedwait(unsigned int sec, int nsec);
1908 private:
1909 jlong currenttime() const;
1910 os_semaphore_t _semaphore;
1911 };
1912
1913 Semaphore::Semaphore() : _semaphore(0) {
1914 SEM_INIT(_semaphore, 0);
1915 }
1916
1917 Semaphore::~Semaphore() {
1918 SEM_DESTROY(_semaphore);
1919 }
1920
1921 void Semaphore::signal() {
1922 SEM_POST(_semaphore);
1923 }
1924
1925 void Semaphore::wait() {
1926 SEM_WAIT(_semaphore);
1927 }
1928
1929 jlong Semaphore::currenttime() const {
1930 struct timeval tv;
1931 gettimeofday(&tv, NULL);
1932 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1933 }
1934
1935 #ifdef __APPLE__
1936 bool Semaphore::trywait() {
1937 return timedwait(0, 0);
1938 }
1939
1940 bool Semaphore::timedwait(unsigned int sec, int nsec) {
1941 kern_return_t kr = KERN_ABORTED;
1942 mach_timespec_t waitspec;
1943 waitspec.tv_sec = sec;
1944 waitspec.tv_nsec = nsec;
1945
1946 jlong starttime = currenttime();
1947
1948 kr = semaphore_timedwait(_semaphore, waitspec);
1949 while (kr == KERN_ABORTED) {
1950 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1951
1952 jlong current = currenttime();
1953 jlong passedtime = current - starttime;
1954
1955 if (passedtime >= totalwait) {
1956 waitspec.tv_sec = 0;
1957 waitspec.tv_nsec = 0;
1958 } else {
1959 jlong waittime = totalwait - (current - starttime);
1960 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
1961 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
1962 }
1963
1964 kr = semaphore_timedwait(_semaphore, waitspec);
1965 }
1966
1967 return kr == KERN_SUCCESS;
1968 }
1969
1970 #else
1971
1972 bool Semaphore::trywait() {
1973 return sem_trywait(&_semaphore) == 0;
1974 }
1975
1976 bool Semaphore::timedwait(unsigned int sec, int nsec) {
1977 struct timespec ts;
1978 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
1979
1980 while (1) {
1981 int result = sem_timedwait(&_semaphore, &ts);
1982 if (result == 0) {
1983 return true;
1984 } else if (errno == EINTR) {
1985 continue;
1986 } else if (errno == ETIMEDOUT) {
1987 return false;
1988 } else {
1989 return false;
1990 }
1991 }
1992 }
1993
1994 #endif // __APPLE__
1995
1996 static os_semaphore_t sig_sem;
1997 static Semaphore sr_semaphore;
1998
1999 void os::signal_init_pd() {
2000 // Initialize signal structures
2001 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2002
2003 // Initialize signal semaphore
2004 ::SEM_INIT(sig_sem, 0);
2005 }
2006
2007 void os::signal_notify(int sig) {
2008 Atomic::inc(&pending_signals[sig]);
2009 ::SEM_POST(sig_sem);
2010 }
2011
2012 static int check_pending_signals(bool wait) {
2013 Atomic::store(0, &sigint_count);
2014 for (;;) {
2015 for (int i = 0; i < NSIG + 1; i++) {
2016 jint n = pending_signals[i];
2017 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2018 return i;
2019 }
2020 }
2021 if (!wait) {
2022 return -1;
2023 }
2024 JavaThread *thread = JavaThread::current();
2025 ThreadBlockInVM tbivm(thread);
2026
2027 bool threadIsSuspended;
2028 do {
2029 thread->set_suspend_equivalent();
2030 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2031 ::SEM_WAIT(sig_sem);
2032
2033 // were we externally suspended while we were waiting?
2034 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2035 if (threadIsSuspended) {
2036 //
2037 // The semaphore has been incremented, but while we were waiting
2038 // another thread suspended us. We don't want to continue running
2039 // while suspended because that would surprise the thread that
2040 // suspended us.
2041 //
2042 ::SEM_POST(sig_sem);
2043
2044 thread->java_suspend_self();
2045 }
2046 } while (threadIsSuspended);
2047 }
2048 }
2049
2050 int os::signal_lookup() {
2051 return check_pending_signals(false);
2052 }
2053
2054 int os::signal_wait() {
2055 return check_pending_signals(true);
2056 }
2057
2058 ////////////////////////////////////////////////////////////////////////////////
2059 // Virtual Memory
2060
2061 int os::vm_page_size() {
2062 // Seems redundant as all get out
2063 assert(os::Bsd::page_size() != -1, "must call os::init");
2064 return os::Bsd::page_size();
2065 }
2066
2067 // Solaris allocates memory by pages.
2068 int os::vm_allocation_granularity() {
2069 assert(os::Bsd::page_size() != -1, "must call os::init");
2070 return os::Bsd::page_size();
2071 }
2072
2073 // Rationale behind this function:
2074 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2075 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2076 // samples for JITted code. Here we create private executable mapping over the code cache
2077 // and then we can use standard (well, almost, as mapping can change) way to provide
2078 // info for the reporting script by storing timestamp and location of symbol
2079 void bsd_wrap_code(char* base, size_t size) {
2080 static volatile jint cnt = 0;
2081
2082 if (!UseOprofile) {
2083 return;
2084 }
2085
2086 char buf[PATH_MAX + 1];
2087 int num = Atomic::add(1, &cnt);
2088
2089 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2090 os::get_temp_directory(), os::current_process_id(), num);
2091 unlink(buf);
2092
2093 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2094
2095 if (fd != -1) {
2096 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2097 if (rv != (off_t)-1) {
2098 if (::write(fd, "", 1) == 1) {
2099 mmap(base, size,
2100 PROT_READ|PROT_WRITE|PROT_EXEC,
2101 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2102 }
2103 }
2104 ::close(fd);
2105 unlink(buf);
2106 }
2107 }
2108
2109 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2110 int err) {
2111 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2112 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2113 strerror(err), err);
2114 }
2115
2116 // NOTE: Bsd kernel does not really reserve the pages for us.
2117 // All it does is to check if there are enough free pages
2118 // left at the time of mmap(). This could be a potential
2119 // problem.
2120 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2121 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2122 #ifdef __OpenBSD__
2123 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2124 if (::mprotect(addr, size, prot) == 0) {
2125 return true;
2126 }
2127 #else
2128 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2129 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2130 if (res != (uintptr_t) MAP_FAILED) {
2131 return true;
2132 }
2133 #endif
2134
2135 // Warn about any commit errors we see in non-product builds just
2136 // in case mmap() doesn't work as described on the man page.
2137 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2138
2139 return false;
2140 }
2141
2142 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2143 bool exec) {
2144 // alignment_hint is ignored on this OS
2145 return pd_commit_memory(addr, size, exec);
2146 }
2147
2148 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2149 const char* mesg) {
2150 assert(mesg != NULL, "mesg must be specified");
2151 if (!pd_commit_memory(addr, size, exec)) {
2152 // add extra info in product mode for vm_exit_out_of_memory():
2153 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2154 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
2155 }
2156 }
2157
2158 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2159 size_t alignment_hint, bool exec,
2160 const char* mesg) {
2161 // alignment_hint is ignored on this OS
2162 pd_commit_memory_or_exit(addr, size, exec, mesg);
2163 }
2164
2165 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2166 }
2167
2168 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2169 ::madvise(addr, bytes, MADV_DONTNEED);
2170 }
2171
2172 void os::numa_make_global(char *addr, size_t bytes) {
2173 }
2174
2175 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2176 }
2177
2178 bool os::numa_topology_changed() { return false; }
2179
2180 size_t os::numa_get_groups_num() {
2181 return 1;
2182 }
2183
2184 int os::numa_get_group_id() {
2185 return 0;
2186 }
2187
2188 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2189 if (size > 0) {
2190 ids[0] = 0;
2191 return 1;
2192 }
2193 return 0;
2194 }
2195
2196 bool os::get_page_info(char *start, page_info* info) {
2197 return false;
2198 }
2199
2200 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2201 return end;
2202 }
2203
2204
2205 bool os::pd_uncommit_memory(char* addr, size_t size) {
2206 #ifdef __OpenBSD__
2207 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2208 return ::mprotect(addr, size, PROT_NONE) == 0;
2209 #else
2210 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2211 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2212 return res != (uintptr_t) MAP_FAILED;
2213 #endif
2214 }
2215
2216 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2217 return os::commit_memory(addr, size, !ExecMem);
2218 }
2219
2220 // If this is a growable mapping, remove the guard pages entirely by
2221 // munmap()ping them. If not, just call uncommit_memory().
2222 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2223 return os::uncommit_memory(addr, size);
2224 }
2225
2226 static address _highest_vm_reserved_address = NULL;
2227
2228 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2229 // at 'requested_addr'. If there are existing memory mappings at the same
2230 // location, however, they will be overwritten. If 'fixed' is false,
2231 // 'requested_addr' is only treated as a hint, the return value may or
2232 // may not start from the requested address. Unlike Bsd mmap(), this
2233 // function returns NULL to indicate failure.
2234 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2235 char * addr;
2236 int flags;
2237
2238 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2239 if (fixed) {
2240 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2241 flags |= MAP_FIXED;
2242 }
2243
2244 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2245 // touch an uncommitted page. Otherwise, the read/write might
2246 // succeed if we have enough swap space to back the physical page.
2247 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2248 flags, -1, 0);
2249
2250 if (addr != MAP_FAILED) {
2251 // anon_mmap() should only get called during VM initialization,
2252 // don't need lock (actually we can skip locking even it can be called
2253 // from multiple threads, because _highest_vm_reserved_address is just a
2254 // hint about the upper limit of non-stack memory regions.)
2255 if ((address)addr + bytes > _highest_vm_reserved_address) {
2256 _highest_vm_reserved_address = (address)addr + bytes;
2257 }
2258 }
2259
2260 return addr == MAP_FAILED ? NULL : addr;
2261 }
2262
2263 // Don't update _highest_vm_reserved_address, because there might be memory
2264 // regions above addr + size. If so, releasing a memory region only creates
2265 // a hole in the address space, it doesn't help prevent heap-stack collision.
2266 //
2267 static int anon_munmap(char * addr, size_t size) {
2268 return ::munmap(addr, size) == 0;
2269 }
2270
2271 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2272 size_t alignment_hint) {
2273 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2274 }
2275
2276 bool os::pd_release_memory(char* addr, size_t size) {
2277 return anon_munmap(addr, size);
2278 }
2279
2280 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2281 // Bsd wants the mprotect address argument to be page aligned.
2282 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
2283
2284 // According to SUSv3, mprotect() should only be used with mappings
2285 // established by mmap(), and mmap() always maps whole pages. Unaligned
2286 // 'addr' likely indicates problem in the VM (e.g. trying to change
2287 // protection of malloc'ed or statically allocated memory). Check the
2288 // caller if you hit this assert.
2289 assert(addr == bottom, "sanity check");
2290
2291 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2292 return ::mprotect(bottom, size, prot) == 0;
2293 }
2294
2295 // Set protections specified
2296 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2297 bool is_committed) {
2298 unsigned int p = 0;
2299 switch (prot) {
2300 case MEM_PROT_NONE: p = PROT_NONE; break;
2301 case MEM_PROT_READ: p = PROT_READ; break;
2302 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2303 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2304 default:
2305 ShouldNotReachHere();
2306 }
2307 // is_committed is unused.
2308 return bsd_mprotect(addr, bytes, p);
2309 }
2310
2311 bool os::guard_memory(char* addr, size_t size) {
2312 return bsd_mprotect(addr, size, PROT_NONE);
2313 }
2314
2315 bool os::unguard_memory(char* addr, size_t size) {
2316 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2317 }
2318
2319 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2320 return false;
2321 }
2322
2323 // Large page support
2324
2325 static size_t _large_page_size = 0;
2326
2327 void os::large_page_init() {
2328 }
2329
2330
2331 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2332 fatal("This code is not used or maintained.");
2333
2334 // "exec" is passed in but not used. Creating the shared image for
2335 // the code cache doesn't have an SHM_X executable permission to check.
2336 assert(UseLargePages && UseSHM, "only for SHM large pages");
2337
2338 key_t key = IPC_PRIVATE;
2339 char *addr;
2340
2341 bool warn_on_failure = UseLargePages &&
2342 (!FLAG_IS_DEFAULT(UseLargePages) ||
2343 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
2344 );
2345 char msg[128];
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 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
2367 warning(msg);
2368 }
2369 return NULL;
2370 }
2371
2372 // attach to the region
2373 addr = (char*)shmat(shmid, req_addr, 0);
2374 int err = errno;
2375
2376 // Remove shmid. If shmat() is successful, the actual shared memory segment
2377 // will be deleted when it's detached by shmdt() or when the process
2378 // terminates. If shmat() is not successful this will remove the shared
2379 // segment immediately.
2380 shmctl(shmid, IPC_RMID, NULL);
2381
2382 if ((intptr_t)addr == -1) {
2383 if (warn_on_failure) {
2384 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
2385 warning(msg);
2386 }
2387 return NULL;
2388 }
2389
2390 // The memory is committed
2391 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC);
2392
2393 return addr;
2394 }
2395
2396 bool os::release_memory_special(char* base, size_t bytes) {
2397 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
2398 // detaching the SHM segment will also delete it, see reserve_memory_special()
2399 int rslt = shmdt(base);
2400 if (rslt == 0) {
2401 tkr.record((address)base, bytes);
2402 return true;
2403 } else {
2404 tkr.discard();
2405 return false;
2406 }
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. Give up after max_tries. Note that reserve_memory() will
2443 // automatically update _highest_vm_reserved_address if the call is
2444 // successful. The variable tracks the highest memory address every reserved
2445 // by JVM. It is used to detect heap-stack collision if running with
2446 // fixed-stack BsdThreads. Because here we may attempt to reserve more
2447 // space than needed, it could confuse the collision detecting code. To
2448 // solve the problem, save current _highest_vm_reserved_address and
2449 // calculate the correct value before return.
2450 address old_highest = _highest_vm_reserved_address;
2451
2452 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2453 // if kernel honors the hint then we can return immediately.
2454 char * addr = anon_mmap(requested_addr, bytes, false);
2455 if (addr == requested_addr) {
2456 return requested_addr;
2457 }
2458
2459 if (addr != NULL) {
2460 // mmap() is successful but it fails to reserve at the requested address
2461 anon_munmap(addr, bytes);
2462 }
2463
2464 int i;
2465 for (i = 0; i < max_tries; ++i) {
2466 base[i] = reserve_memory(bytes);
2467
2468 if (base[i] != NULL) {
2469 // Is this the block we wanted?
2470 if (base[i] == requested_addr) {
2471 size[i] = bytes;
2472 break;
2473 }
2474
2475 // Does this overlap the block we wanted? Give back the overlapped
2476 // parts and try again.
2477
2478 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2479 if (top_overlap >= 0 && top_overlap < bytes) {
2480 unmap_memory(base[i], top_overlap);
2481 base[i] += top_overlap;
2482 size[i] = bytes - top_overlap;
2483 } else {
2484 size_t bottom_overlap = base[i] + bytes - requested_addr;
2485 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2486 unmap_memory(requested_addr, bottom_overlap);
2487 size[i] = bytes - bottom_overlap;
2488 } else {
2489 size[i] = bytes;
2490 }
2491 }
2492 }
2493 }
2494
2495 // Give back the unused reserved pieces.
2496
2497 for (int j = 0; j < i; ++j) {
2498 if (base[j] != NULL) {
2499 unmap_memory(base[j], size[j]);
2500 }
2501 }
2502
2503 if (i < max_tries) {
2504 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes);
2505 return requested_addr;
2506 } else {
2507 _highest_vm_reserved_address = old_highest;
2508 return NULL;
2509 }
2510 }
2511
2512 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2513 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2514 }
2515
2516 void os::naked_short_sleep(jlong ms) {
2517 struct timespec req;
2518
2519 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2520 req.tv_sec = 0;
2521 if (ms > 0) {
2522 req.tv_nsec = (ms % 1000) * 1000000;
2523 }
2524 else {
2525 req.tv_nsec = 1;
2526 }
2527
2528 nanosleep(&req, NULL);
2529
2530 return;
2531 }
2532
2533 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2534 void os::infinite_sleep() {
2535 while (true) { // sleep forever ...
2536 ::sleep(100); // ... 100 seconds at a time
2537 }
2538 }
2539
2540 // Used to convert frequent JVM_Yield() to nops
2541 bool os::dont_yield() {
2542 return DontYieldALot;
2543 }
2544
2545 void os::yield() {
2546 sched_yield();
2547 }
2548
2549 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
2550
2551 void os::yield_all(int attempts) {
2552 // Yields to all threads, including threads with lower priorities
2553 // Threads on Bsd are all with same priority. The Solaris style
2554 // os::yield_all() with nanosleep(1ms) is not necessary.
2555 sched_yield();
2556 }
2557
2558 // Called from the tight loops to possibly influence time-sharing heuristics
2559 void os::loop_breaker(int attempts) {
2560 os::yield_all(attempts);
2561 }
2562
2563 ////////////////////////////////////////////////////////////////////////////////
2564 // thread priority support
2565
2566 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2567 // only supports dynamic priority, static priority must be zero. For real-time
2568 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2569 // However, for large multi-threaded applications, SCHED_RR is not only slower
2570 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2571 // of 5 runs - Sep 2005).
2572 //
2573 // The following code actually changes the niceness of kernel-thread/LWP. It
2574 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2575 // not the entire user process, and user level threads are 1:1 mapped to kernel
2576 // threads. It has always been the case, but could change in the future. For
2577 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2578 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2579
2580 #if !defined(__APPLE__)
2581 int os::java_to_os_priority[CriticalPriority + 1] = {
2582 19, // 0 Entry should never be used
2583
2584 0, // 1 MinPriority
2585 3, // 2
2586 6, // 3
2587
2588 10, // 4
2589 15, // 5 NormPriority
2590 18, // 6
2591
2592 21, // 7
2593 25, // 8
2594 28, // 9 NearMaxPriority
2595
2596 31, // 10 MaxPriority
2597
2598 31 // 11 CriticalPriority
2599 };
2600 #else
2601 /* Using Mach high-level priority assignments */
2602 int os::java_to_os_priority[CriticalPriority + 1] = {
2603 0, // 0 Entry should never be used (MINPRI_USER)
2604
2605 27, // 1 MinPriority
2606 28, // 2
2607 29, // 3
2608
2609 30, // 4
2610 31, // 5 NormPriority (BASEPRI_DEFAULT)
2611 32, // 6
2612
2613 33, // 7
2614 34, // 8
2615 35, // 9 NearMaxPriority
2616
2617 36, // 10 MaxPriority
2618
2619 36 // 11 CriticalPriority
2620 };
2621 #endif
2622
2623 static int prio_init() {
2624 if (ThreadPriorityPolicy == 1) {
2625 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2626 // if effective uid is not root. Perhaps, a more elegant way of doing
2627 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2628 if (geteuid() != 0) {
2629 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2630 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2631 }
2632 ThreadPriorityPolicy = 0;
2633 }
2634 }
2635 if (UseCriticalJavaThreadPriority) {
2636 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2637 }
2638 return 0;
2639 }
2640
2641 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2642 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK;
2643
2644 #ifdef __OpenBSD__
2645 // OpenBSD pthread_setprio starves low priority threads
2646 return OS_OK;
2647 #elif defined(__FreeBSD__)
2648 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2649 #elif defined(__APPLE__) || defined(__NetBSD__)
2650 struct sched_param sp;
2651 int policy;
2652 pthread_t self = pthread_self();
2653
2654 if (pthread_getschedparam(self, &policy, &sp) != 0)
2655 return OS_ERR;
2656
2657 sp.sched_priority = newpri;
2658 if (pthread_setschedparam(self, policy, &sp) != 0)
2659 return OS_ERR;
2660
2661 return OS_OK;
2662 #else
2663 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2664 return (ret == 0) ? OS_OK : OS_ERR;
2665 #endif
2666 }
2667
2668 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2669 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) {
2670 *priority_ptr = java_to_os_priority[NormPriority];
2671 return OS_OK;
2672 }
2673
2674 errno = 0;
2675 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2676 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2677 #elif defined(__APPLE__) || defined(__NetBSD__)
2678 int policy;
2679 struct sched_param sp;
2680
2681 pthread_getschedparam(pthread_self(), &policy, &sp);
2682 *priority_ptr = sp.sched_priority;
2683 #else
2684 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2685 #endif
2686 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2687 }
2688
2689 // Hint to the underlying OS that a task switch would not be good.
2690 // Void return because it's a hint and can fail.
2691 void os::hint_no_preempt() {}
2692
2693 ////////////////////////////////////////////////////////////////////////////////
2694 // suspend/resume support
2695
2696 // the low-level signal-based suspend/resume support is a remnant from the
2697 // old VM-suspension that used to be for java-suspension, safepoints etc,
2698 // within hotspot. Now there is a single use-case for this:
2699 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2700 // that runs in the watcher thread.
2701 // The remaining code is greatly simplified from the more general suspension
2702 // code that used to be used.
2703 //
2704 // The protocol is quite simple:
2705 // - suspend:
2706 // - sends a signal to the target thread
2707 // - polls the suspend state of the osthread using a yield loop
2708 // - target thread signal handler (SR_handler) sets suspend state
2709 // and blocks in sigsuspend until continued
2710 // - resume:
2711 // - sets target osthread state to continue
2712 // - sends signal to end the sigsuspend loop in the SR_handler
2713 //
2714 // Note that the SR_lock plays no role in this suspend/resume protocol.
2715 //
2716
2717 static void resume_clear_context(OSThread *osthread) {
2718 osthread->set_ucontext(NULL);
2719 osthread->set_siginfo(NULL);
2720 }
2721
2722 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2723 osthread->set_ucontext(context);
2724 osthread->set_siginfo(siginfo);
2725 }
2726
2727 //
2728 // Handler function invoked when a thread's execution is suspended or
2729 // resumed. We have to be careful that only async-safe functions are
2730 // called here (Note: most pthread functions are not async safe and
2731 // should be avoided.)
2732 //
2733 // Note: sigwait() is a more natural fit than sigsuspend() from an
2734 // interface point of view, but sigwait() prevents the signal hander
2735 // from being run. libpthread would get very confused by not having
2736 // its signal handlers run and prevents sigwait()'s use with the
2737 // mutex granting granting signal.
2738 //
2739 // Currently only ever called on the VMThread or JavaThread
2740 //
2741 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2742 // Save and restore errno to avoid confusing native code with EINTR
2743 // after sigsuspend.
2744 int old_errno = errno;
2745
2746 Thread* thread = Thread::current();
2747 OSThread* osthread = thread->osthread();
2748 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2749
2750 os::SuspendResume::State current = osthread->sr.state();
2751 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2752 suspend_save_context(osthread, siginfo, context);
2753
2754 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2755 os::SuspendResume::State state = osthread->sr.suspended();
2756 if (state == os::SuspendResume::SR_SUSPENDED) {
2757 sigset_t suspend_set; // signals for sigsuspend()
2758
2759 // get current set of blocked signals and unblock resume signal
2760 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2761 sigdelset(&suspend_set, SR_signum);
2762
2763 sr_semaphore.signal();
2764 // wait here until we are resumed
2765 while (1) {
2766 sigsuspend(&suspend_set);
2767
2768 os::SuspendResume::State result = osthread->sr.running();
2769 if (result == os::SuspendResume::SR_RUNNING) {
2770 sr_semaphore.signal();
2771 break;
2772 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2773 ShouldNotReachHere();
2774 }
2775 }
2776
2777 } else if (state == os::SuspendResume::SR_RUNNING) {
2778 // request was cancelled, continue
2779 } else {
2780 ShouldNotReachHere();
2781 }
2782
2783 resume_clear_context(osthread);
2784 } else if (current == os::SuspendResume::SR_RUNNING) {
2785 // request was cancelled, continue
2786 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2787 // ignore
2788 } else {
2789 // ignore
2790 }
2791
2792 errno = old_errno;
2793 }
2794
2795
2796 static int SR_initialize() {
2797 struct sigaction act;
2798 char *s;
2799 /* Get signal number to use for suspend/resume */
2800 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2801 int sig = ::strtol(s, 0, 10);
2802 if (sig > 0 || sig < NSIG) {
2803 SR_signum = sig;
2804 }
2805 }
2806
2807 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2808 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2809
2810 sigemptyset(&SR_sigset);
2811 sigaddset(&SR_sigset, SR_signum);
2812
2813 /* Set up signal handler for suspend/resume */
2814 act.sa_flags = SA_RESTART|SA_SIGINFO;
2815 act.sa_handler = (void (*)(int)) SR_handler;
2816
2817 // SR_signum is blocked by default.
2818 // 4528190 - We also need to block pthread restart signal (32 on all
2819 // supported Bsd platforms). Note that BsdThreads need to block
2820 // this signal for all threads to work properly. So we don't have
2821 // to use hard-coded signal number when setting up the mask.
2822 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2823
2824 if (sigaction(SR_signum, &act, 0) == -1) {
2825 return -1;
2826 }
2827
2828 // Save signal flag
2829 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2830 return 0;
2831 }
2832
2833 static int sr_notify(OSThread* osthread) {
2834 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2835 assert_status(status == 0, status, "pthread_kill");
2836 return status;
2837 }
2838
2839 // "Randomly" selected value for how long we want to spin
2840 // before bailing out on suspending a thread, also how often
2841 // we send a signal to a thread we want to resume
2842 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2843 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2844
2845 // returns true on success and false on error - really an error is fatal
2846 // but this seems the normal response to library errors
2847 static bool do_suspend(OSThread* osthread) {
2848 assert(osthread->sr.is_running(), "thread should be running");
2849 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2850
2851 // mark as suspended and send signal
2852 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2853 // failed to switch, state wasn't running?
2854 ShouldNotReachHere();
2855 return false;
2856 }
2857
2858 if (sr_notify(osthread) != 0) {
2859 ShouldNotReachHere();
2860 }
2861
2862 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2863 while (true) {
2864 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2865 break;
2866 } else {
2867 // timeout
2868 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2869 if (cancelled == os::SuspendResume::SR_RUNNING) {
2870 return false;
2871 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2872 // make sure that we consume the signal on the semaphore as well
2873 sr_semaphore.wait();
2874 break;
2875 } else {
2876 ShouldNotReachHere();
2877 return false;
2878 }
2879 }
2880 }
2881
2882 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2883 return true;
2884 }
2885
2886 static void do_resume(OSThread* osthread) {
2887 assert(osthread->sr.is_suspended(), "thread should be suspended");
2888 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2889
2890 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2891 // failed to switch to WAKEUP_REQUEST
2892 ShouldNotReachHere();
2893 return;
2894 }
2895
2896 while (true) {
2897 if (sr_notify(osthread) == 0) {
2898 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2899 if (osthread->sr.is_running()) {
2900 return;
2901 }
2902 }
2903 } else {
2904 ShouldNotReachHere();
2905 }
2906 }
2907
2908 guarantee(osthread->sr.is_running(), "Must be running!");
2909 }
2910
2911 ///////////////////////////////////////////////////////////////////////////////////
2912 // signal handling (except suspend/resume)
2913
2914 // This routine may be used by user applications as a "hook" to catch signals.
2915 // The user-defined signal handler must pass unrecognized signals to this
2916 // routine, and if it returns true (non-zero), then the signal handler must
2917 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2918 // routine will never retun false (zero), but instead will execute a VM panic
2919 // routine kill the process.
2920 //
2921 // If this routine returns false, it is OK to call it again. This allows
2922 // the user-defined signal handler to perform checks either before or after
2923 // the VM performs its own checks. Naturally, the user code would be making
2924 // a serious error if it tried to handle an exception (such as a null check
2925 // or breakpoint) that the VM was generating for its own correct operation.
2926 //
2927 // This routine may recognize any of the following kinds of signals:
2928 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2929 // It should be consulted by handlers for any of those signals.
2930 //
2931 // The caller of this routine must pass in the three arguments supplied
2932 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2933 // field of the structure passed to sigaction(). This routine assumes that
2934 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2935 //
2936 // Note that the VM will print warnings if it detects conflicting signal
2937 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2938 //
2939 extern "C" JNIEXPORT int
2940 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2941 void* ucontext, int abort_if_unrecognized);
2942
2943 void signalHandler(int sig, siginfo_t* info, void* uc) {
2944 assert(info != NULL && uc != NULL, "it must be old kernel");
2945 int orig_errno = errno; // Preserve errno value over signal handler.
2946 JVM_handle_bsd_signal(sig, info, uc, true);
2947 errno = orig_errno;
2948 }
2949
2950
2951 // This boolean allows users to forward their own non-matching signals
2952 // to JVM_handle_bsd_signal, harmlessly.
2953 bool os::Bsd::signal_handlers_are_installed = false;
2954
2955 // For signal-chaining
2956 struct sigaction os::Bsd::sigact[MAXSIGNUM];
2957 unsigned int os::Bsd::sigs = 0;
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 ((( (unsigned int)1 << sig ) & 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 < MAXSIGNUM, "vm signal out of expected range");
3043 sigact[sig] = oldAct;
3044 sigs |= (unsigned int)1 << sig;
3045 }
3046
3047 // for diagnostic
3048 int os::Bsd::sigflags[MAXSIGNUM];
3049
3050 int os::Bsd::get_our_sigflags(int sig) {
3051 assert(sig > 0 && sig < MAXSIGNUM, "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 < MAXSIGNUM, "vm signal out of expected range");
3057 sigflags[sig] = flags;
3058 }
3059
3060 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3061 // Check for overwrite.
3062 struct sigaction oldAct;
3063 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3064
3065 void* oldhand = oldAct.sa_sigaction
3066 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3067 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3068 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3069 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3070 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3071 if (AllowUserSignalHandlers || !set_installed) {
3072 // Do not overwrite; user takes responsibility to forward to us.
3073 return;
3074 } else if (UseSignalChaining) {
3075 // save the old handler in jvm
3076 save_preinstalled_handler(sig, oldAct);
3077 // libjsig also interposes the sigaction() call below and saves the
3078 // old sigaction on it own.
3079 } else {
3080 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3081 "%#lx for signal %d.", (long)oldhand, sig));
3082 }
3083 }
3084
3085 struct sigaction sigAct;
3086 sigfillset(&(sigAct.sa_mask));
3087 sigAct.sa_handler = SIG_DFL;
3088 if (!set_installed) {
3089 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3090 } else {
3091 sigAct.sa_sigaction = signalHandler;
3092 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3093 }
3094 #if __APPLE__
3095 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3096 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3097 // if the signal handler declares it will handle it on alternate stack.
3098 // Notice we only declare we will handle it on alt stack, but we are not
3099 // actually going to use real alt stack - this is just a workaround.
3100 // Please see ux_exception.c, method catch_mach_exception_raise for details
3101 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3102 if (sig == SIGSEGV) {
3103 sigAct.sa_flags |= SA_ONSTACK;
3104 }
3105 #endif
3106
3107 // Save flags, which are set by ours
3108 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3109 sigflags[sig] = sigAct.sa_flags;
3110
3111 int ret = sigaction(sig, &sigAct, &oldAct);
3112 assert(ret == 0, "check");
3113
3114 void* oldhand2 = oldAct.sa_sigaction
3115 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3116 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3117 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3118 }
3119
3120 // install signal handlers for signals that HotSpot needs to
3121 // handle in order to support Java-level exception handling.
3122
3123 void os::Bsd::install_signal_handlers() {
3124 if (!signal_handlers_are_installed) {
3125 signal_handlers_are_installed = true;
3126
3127 // signal-chaining
3128 typedef void (*signal_setting_t)();
3129 signal_setting_t begin_signal_setting = NULL;
3130 signal_setting_t end_signal_setting = NULL;
3131 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3132 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3133 if (begin_signal_setting != NULL) {
3134 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3135 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3136 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3137 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3138 libjsig_is_loaded = true;
3139 assert(UseSignalChaining, "should enable signal-chaining");
3140 }
3141 if (libjsig_is_loaded) {
3142 // Tell libjsig jvm is setting signal handlers
3143 (*begin_signal_setting)();
3144 }
3145
3146 set_signal_handler(SIGSEGV, true);
3147 set_signal_handler(SIGPIPE, true);
3148 set_signal_handler(SIGBUS, true);
3149 set_signal_handler(SIGILL, true);
3150 set_signal_handler(SIGFPE, true);
3151 set_signal_handler(SIGXFSZ, true);
3152
3153 #if defined(__APPLE__)
3154 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3155 // signals caught and handled by the JVM. To work around this, we reset the mach task
3156 // signal handler that's placed on our process by CrashReporter. This disables
3157 // CrashReporter-based reporting.
3158 //
3159 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3160 // on caught fatal signals.
3161 //
3162 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3163 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3164 // exception handling, while leaving the standard BSD signal handlers functional.
3165 kern_return_t kr;
3166 kr = task_set_exception_ports(mach_task_self(),
3167 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3168 MACH_PORT_NULL,
3169 EXCEPTION_STATE_IDENTITY,
3170 MACHINE_THREAD_STATE);
3171
3172 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3173 #endif
3174
3175 if (libjsig_is_loaded) {
3176 // Tell libjsig jvm finishes setting signal handlers
3177 (*end_signal_setting)();
3178 }
3179
3180 // We don't activate signal checker if libjsig is in place, we trust ourselves
3181 // and if UserSignalHandler is installed all bets are off
3182 if (CheckJNICalls) {
3183 if (libjsig_is_loaded) {
3184 if (PrintJNIResolving) {
3185 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3186 }
3187 check_signals = false;
3188 }
3189 if (AllowUserSignalHandlers) {
3190 if (PrintJNIResolving) {
3191 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3192 }
3193 check_signals = false;
3194 }
3195 }
3196 }
3197 }
3198
3199
3200 /////
3201 // glibc on Bsd platform uses non-documented flag
3202 // to indicate, that some special sort of signal
3203 // trampoline is used.
3204 // We will never set this flag, and we should
3205 // ignore this flag in our diagnostic
3206 #ifdef SIGNIFICANT_SIGNAL_MASK
3207 #undef SIGNIFICANT_SIGNAL_MASK
3208 #endif
3209 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3210
3211 static const char* get_signal_handler_name(address handler,
3212 char* buf, int buflen) {
3213 int offset;
3214 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3215 if (found) {
3216 // skip directory names
3217 const char *p1, *p2;
3218 p1 = buf;
3219 size_t len = strlen(os::file_separator());
3220 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3221 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3222 } else {
3223 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3224 }
3225 return buf;
3226 }
3227
3228 static void print_signal_handler(outputStream* st, int sig,
3229 char* buf, size_t buflen) {
3230 struct sigaction sa;
3231
3232 sigaction(sig, NULL, &sa);
3233
3234 // See comment for SIGNIFICANT_SIGNAL_MASK define
3235 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3236
3237 st->print("%s: ", os::exception_name(sig, buf, buflen));
3238
3239 address handler = (sa.sa_flags & SA_SIGINFO)
3240 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3241 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3242
3243 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3244 st->print("SIG_DFL");
3245 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3246 st->print("SIG_IGN");
3247 } else {
3248 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3249 }
3250
3251 st->print(", sa_mask[0]=");
3252 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3253
3254 address rh = VMError::get_resetted_sighandler(sig);
3255 // May be, handler was resetted by VMError?
3256 if(rh != NULL) {
3257 handler = rh;
3258 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3259 }
3260
3261 st->print(", sa_flags=");
3262 os::Posix::print_sa_flags(st, sa.sa_flags);
3263
3264 // Check: is it our handler?
3265 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3266 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3267 // It is our signal handler
3268 // check for flags, reset system-used one!
3269 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3270 st->print(
3271 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3272 os::Bsd::get_our_sigflags(sig));
3273 }
3274 }
3275 st->cr();
3276 }
3277
3278
3279 #define DO_SIGNAL_CHECK(sig) \
3280 if (!sigismember(&check_signal_done, sig) && (sig != SIGINT || isatty(fileno(stdin)))) \
3281 os::Bsd::check_signal_handler(sig)
3282
3283 // This method is a periodic task to check for misbehaving JNI applications
3284 // under CheckJNI, we can add any periodic checks here
3285
3286 void os::run_periodic_checks() {
3287
3288 if (check_signals == false) return;
3289
3290 // SEGV and BUS if overridden could potentially prevent
3291 // generation of hs*.log in the event of a crash, debugging
3292 // such a case can be very challenging, so we absolutely
3293 // check the following for a good measure:
3294 DO_SIGNAL_CHECK(SIGSEGV);
3295 DO_SIGNAL_CHECK(SIGILL);
3296 DO_SIGNAL_CHECK(SIGFPE);
3297 DO_SIGNAL_CHECK(SIGBUS);
3298 DO_SIGNAL_CHECK(SIGPIPE);
3299 DO_SIGNAL_CHECK(SIGXFSZ);
3300
3301
3302 // ReduceSignalUsage allows the user to override these handlers
3303 // see comments at the very top and jvm_solaris.h
3304 if (!ReduceSignalUsage) {
3305 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3306 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3307 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3308 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3309 }
3310
3311 DO_SIGNAL_CHECK(SR_signum);
3312 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3313 }
3314
3315 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3316
3317 static os_sigaction_t os_sigaction = NULL;
3318
3319 void os::Bsd::check_signal_handler(int sig) {
3320 char buf[O_BUFLEN];
3321 address jvmHandler = NULL;
3322
3323
3324 struct sigaction act;
3325 if (os_sigaction == NULL) {
3326 // only trust the default sigaction, in case it has been interposed
3327 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3328 if (os_sigaction == NULL) return;
3329 }
3330
3331 os_sigaction(sig, (struct sigaction*)NULL, &act);
3332
3333
3334 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3335
3336 address thisHandler = (act.sa_flags & SA_SIGINFO)
3337 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3338 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
3339
3340
3341 switch(sig) {
3342 case SIGSEGV:
3343 case SIGBUS:
3344 case SIGFPE:
3345 case SIGPIPE:
3346 case SIGILL:
3347 case SIGXFSZ:
3348 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3349 break;
3350
3351 case SHUTDOWN1_SIGNAL:
3352 case SHUTDOWN2_SIGNAL:
3353 case SHUTDOWN3_SIGNAL:
3354 case BREAK_SIGNAL:
3355 jvmHandler = (address)user_handler();
3356 break;
3357
3358 case INTERRUPT_SIGNAL:
3359 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
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 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3378 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3379 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig));
3380 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3381 // No need to check this sig any longer
3382 sigaddset(&check_signal_done, sig);
3383 }
3384
3385 // Dump all the signal
3386 if (sigismember(&check_signal_done, sig)) {
3387 print_signal_handlers(tty, buf, O_BUFLEN);
3388 }
3389 }
3390
3391 extern void report_error(char* file_name, int line_no, char* title, char* format, ...);
3392
3393 extern bool signal_name(int signo, char* buf, size_t len);
3394
3395 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3396 if (0 < exception_code && exception_code <= SIGRTMAX) {
3397 // signal
3398 if (!signal_name(exception_code, buf, size)) {
3399 jio_snprintf(buf, size, "SIG%d", exception_code);
3400 }
3401 return buf;
3402 } else {
3403 return NULL;
3404 }
3405 }
3406
3407 // this is called _before_ the most of global arguments have been parsed
3408 void os::init(void) {
3409 char dummy; /* used to get a guess on initial stack address */
3410 // first_hrtime = gethrtime();
3411
3412 // With BsdThreads the JavaMain thread pid (primordial thread)
3413 // is different than the pid of the java launcher thread.
3414 // So, on Bsd, the launcher thread pid is passed to the VM
3415 // via the sun.java.launcher.pid property.
3416 // Use this property instead of getpid() if it was correctly passed.
3417 // See bug 6351349.
3418 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3419
3420 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3421
3422 clock_tics_per_sec = CLK_TCK;
3423
3424 init_random(1234567);
3425
3426 ThreadCritical::initialize();
3427
3428 Bsd::set_page_size(getpagesize());
3429 if (Bsd::page_size() == -1) {
3430 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)",
3431 strerror(errno)));
3432 }
3433 init_page_sizes((size_t) Bsd::page_size());
3434
3435 Bsd::initialize_system_info();
3436
3437 // main_thread points to the aboriginal thread
3438 Bsd::_main_thread = pthread_self();
3439
3440 Bsd::clock_init();
3441 initial_time_count = javaTimeNanos();
3442
3443 #ifdef __APPLE__
3444 // XXXDARWIN
3445 // Work around the unaligned VM callbacks in hotspot's
3446 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3447 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3448 // alignment when doing symbol lookup. To work around this, we force early
3449 // binding of all symbols now, thus binding when alignment is known-good.
3450 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3451 #endif
3452 }
3453
3454 // To install functions for atexit system call
3455 extern "C" {
3456 static void perfMemory_exit_helper() {
3457 perfMemory_exit();
3458 }
3459 }
3460
3461 // this is called _after_ the global arguments have been parsed
3462 jint os::init_2(void)
3463 {
3464 // Allocate a single page and mark it as readable for safepoint polling
3465 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3466 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" );
3467
3468 os::set_polling_page( polling_page );
3469
3470 #ifndef PRODUCT
3471 if(Verbose && PrintMiscellaneous)
3472 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3473 #endif
3474
3475 if (!UseMembar) {
3476 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3477 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page");
3478 os::set_memory_serialize_page( mem_serialize_page );
3479
3480 #ifndef PRODUCT
3481 if(Verbose && PrintMiscellaneous)
3482 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3483 #endif
3484 }
3485
3486 // initialize suspend/resume support - must do this before signal_sets_init()
3487 if (SR_initialize() != 0) {
3488 perror("SR_initialize failed");
3489 return JNI_ERR;
3490 }
3491
3492 Bsd::signal_sets_init();
3493 Bsd::install_signal_handlers();
3494
3495 // Check minimum allowable stack size for thread creation and to initialize
3496 // the java system classes, including StackOverflowError - depends on page
3497 // size. Add a page for compiler2 recursion in main thread.
3498 // Add in 2*BytesPerWord times page size to account for VM stack during
3499 // class initialization depending on 32 or 64 bit VM.
3500 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
3501 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3502 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
3503
3504 size_t threadStackSizeInBytes = ThreadStackSize * K;
3505 if (threadStackSizeInBytes != 0 &&
3506 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
3507 tty->print_cr("\nThe stack size specified is too small, "
3508 "Specify at least %dk",
3509 os::Bsd::min_stack_allowed/ K);
3510 return JNI_ERR;
3511 }
3512
3513 // Make the stack size a multiple of the page size so that
3514 // the yellow/red zones can be guarded.
3515 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
3516 vm_page_size()));
3517
3518 if (MaxFDLimit) {
3519 // set the number of file descriptors to max. print out error
3520 // if getrlimit/setrlimit fails but continue regardless.
3521 struct rlimit nbr_files;
3522 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3523 if (status != 0) {
3524 if (PrintMiscellaneous && (Verbose || WizardMode))
3525 perror("os::init_2 getrlimit failed");
3526 } else {
3527 nbr_files.rlim_cur = nbr_files.rlim_max;
3528
3529 #ifdef __APPLE__
3530 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3531 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3532 // be used instead
3533 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3534 #endif
3535
3536 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3537 if (status != 0) {
3538 if (PrintMiscellaneous && (Verbose || WizardMode))
3539 perror("os::init_2 setrlimit failed");
3540 }
3541 }
3542 }
3543
3544 // at-exit methods are called in the reverse order of their registration.
3545 // atexit functions are called on return from main or as a result of a
3546 // call to exit(3C). There can be only 32 of these functions registered
3547 // and atexit() does not set errno.
3548
3549 if (PerfAllowAtExitRegistration) {
3550 // only register atexit functions if PerfAllowAtExitRegistration is set.
3551 // atexit functions can be delayed until process exit time, which
3552 // can be problematic for embedded VM situations. Embedded VMs should
3553 // call DestroyJavaVM() to assure that VM resources are released.
3554
3555 // note: perfMemory_exit_helper atexit function may be removed in
3556 // the future if the appropriate cleanup code can be added to the
3557 // VM_Exit VMOperation's doit method.
3558 if (atexit(perfMemory_exit_helper) != 0) {
3559 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3560 }
3561 }
3562
3563 // initialize thread priority policy
3564 prio_init();
3565
3566 #ifdef __APPLE__
3567 // dynamically link to objective c gc registration
3568 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3569 if (handleLibObjc != NULL) {
3570 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3571 }
3572 #endif
3573
3574 return JNI_OK;
3575 }
3576
3577 // this is called at the end of vm_initialization
3578 void os::init_3(void) { }
3579
3580 // Mark the polling page as unreadable
3581 void os::make_polling_page_unreadable(void) {
3582 if( !guard_memory((char*)_polling_page, Bsd::page_size()) )
3583 fatal("Could not disable polling page");
3584 };
3585
3586 // Mark the polling page as readable
3587 void os::make_polling_page_readable(void) {
3588 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3589 fatal("Could not enable polling page");
3590 }
3591 };
3592
3593 int os::active_processor_count() {
3594 return _processor_count;
3595 }
3596
3597 void os::set_native_thread_name(const char *name) {
3598 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3599 // This is only supported in Snow Leopard and beyond
3600 if (name != NULL) {
3601 // Add a "Java: " prefix to the name
3602 char buf[MAXTHREADNAMESIZE];
3603 snprintf(buf, sizeof(buf), "Java: %s", name);
3604 pthread_setname_np(buf);
3605 }
3606 #endif
3607 }
3608
3609 bool os::distribute_processes(uint length, uint* distribution) {
3610 // Not yet implemented.
3611 return false;
3612 }
3613
3614 bool os::bind_to_processor(uint processor_id) {
3615 // Not yet implemented.
3616 return false;
3617 }
3618
3619 void os::SuspendedThreadTask::internal_do_task() {
3620 if (do_suspend(_thread->osthread())) {
3621 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3622 do_task(context);
3623 do_resume(_thread->osthread());
3624 }
3625 }
3626
3627 ///
3628 class PcFetcher : public os::SuspendedThreadTask {
3629 public:
3630 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3631 ExtendedPC result();
3632 protected:
3633 void do_task(const os::SuspendedThreadTaskContext& context);
3634 private:
3635 ExtendedPC _epc;
3636 };
3637
3638 ExtendedPC PcFetcher::result() {
3639 guarantee(is_done(), "task is not done yet.");
3640 return _epc;
3641 }
3642
3643 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3644 Thread* thread = context.thread();
3645 OSThread* osthread = thread->osthread();
3646 if (osthread->ucontext() != NULL) {
3647 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext());
3648 } else {
3649 // NULL context is unexpected, double-check this is the VMThread
3650 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3651 }
3652 }
3653
3654 // Suspends the target using the signal mechanism and then grabs the PC before
3655 // resuming the target. Used by the flat-profiler only
3656 ExtendedPC os::get_thread_pc(Thread* thread) {
3657 // Make sure that it is called by the watcher for the VMThread
3658 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3659 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3660
3661 PcFetcher fetcher(thread);
3662 fetcher.run();
3663 return fetcher.result();
3664 }
3665
3666 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime)
3667 {
3668 return pthread_cond_timedwait(_cond, _mutex, _abstime);
3669 }
3670
3671 ////////////////////////////////////////////////////////////////////////////////
3672 // debug support
3673
3674 bool os::find(address addr, outputStream* st) {
3675 Dl_info dlinfo;
3676 memset(&dlinfo, 0, sizeof(dlinfo));
3677 if (dladdr(addr, &dlinfo) != 0) {
3678 st->print(PTR_FORMAT ": ", addr);
3679 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3680 st->print("%s+%#x", dlinfo.dli_sname,
3681 addr - (intptr_t)dlinfo.dli_saddr);
3682 } else if (dlinfo.dli_fbase != NULL) {
3683 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3684 } else {
3685 st->print("<absolute address>");
3686 }
3687 if (dlinfo.dli_fname != NULL) {
3688 st->print(" in %s", dlinfo.dli_fname);
3689 }
3690 if (dlinfo.dli_fbase != NULL) {
3691 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3692 }
3693 st->cr();
3694
3695 if (Verbose) {
3696 // decode some bytes around the PC
3697 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3698 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3699 address lowest = (address) dlinfo.dli_sname;
3700 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3701 if (begin < lowest) begin = lowest;
3702 Dl_info dlinfo2;
3703 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3704 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
3705 end = (address) dlinfo2.dli_saddr;
3706 Disassembler::decode(begin, end, st);
3707 }
3708 return true;
3709 }
3710 return false;
3711 }
3712
3713 ////////////////////////////////////////////////////////////////////////////////
3714 // misc
3715
3716 // This does not do anything on Bsd. This is basically a hook for being
3717 // able to use structured exception handling (thread-local exception filters)
3718 // on, e.g., Win32.
3719 void
3720 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3721 JavaCallArguments* args, Thread* thread) {
3722 f(value, method, args, thread);
3723 }
3724
3725 void os::print_statistics() {
3726 }
3727
3728 int os::message_box(const char* title, const char* message) {
3729 int i;
3730 fdStream err(defaultStream::error_fd());
3731 for (i = 0; i < 78; i++) err.print_raw("=");
3732 err.cr();
3733 err.print_raw_cr(title);
3734 for (i = 0; i < 78; i++) err.print_raw("-");
3735 err.cr();
3736 err.print_raw_cr(message);
3737 for (i = 0; i < 78; i++) err.print_raw("=");
3738 err.cr();
3739
3740 char buf[16];
3741 // Prevent process from exiting upon "read error" without consuming all CPU
3742 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3743
3744 return buf[0] == 'y' || buf[0] == 'Y';
3745 }
3746
3747 int os::stat(const char *path, struct stat *sbuf) {
3748 char pathbuf[MAX_PATH];
3749 if (strlen(path) > MAX_PATH - 1) {
3750 errno = ENAMETOOLONG;
3751 return -1;
3752 }
3753 os::native_path(strcpy(pathbuf, path));
3754 return ::stat(pathbuf, sbuf);
3755 }
3756
3757 bool os::check_heap(bool force) {
3758 return true;
3759 }
3760
3761 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
3762 return ::vsnprintf(buf, count, format, args);
3763 }
3764
3765 // Is a (classpath) directory empty?
3766 bool os::dir_is_empty(const char* path) {
3767 DIR *dir = NULL;
3768 struct dirent *ptr;
3769
3770 dir = opendir(path);
3771 if (dir == NULL) return true;
3772
3773 /* Scan the directory */
3774 bool result = true;
3775 char buf[sizeof(struct dirent) + MAX_PATH];
3776 while (result && (ptr = ::readdir(dir)) != NULL) {
3777 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3778 result = false;
3779 }
3780 }
3781 closedir(dir);
3782 return result;
3783 }
3784
3785 // This code originates from JDK's sysOpen and open64_w
3786 // from src/solaris/hpi/src/system_md.c
3787
3788 #ifndef O_DELETE
3789 #define O_DELETE 0x10000
3790 #endif
3791
3792 // Open a file. Unlink the file immediately after open returns
3793 // if the specified oflag has the O_DELETE flag set.
3794 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
3795
3796 int os::open(const char *path, int oflag, int mode) {
3797
3798 if (strlen(path) > MAX_PATH - 1) {
3799 errno = ENAMETOOLONG;
3800 return -1;
3801 }
3802 int fd;
3803 int o_delete = (oflag & O_DELETE);
3804 oflag = oflag & ~O_DELETE;
3805
3806 fd = ::open(path, oflag, mode);
3807 if (fd == -1) return -1;
3808
3809 //If the open succeeded, the file might still be a directory
3810 {
3811 struct stat buf;
3812 int ret = ::fstat(fd, &buf);
3813 int st_mode = buf.st_mode;
3814
3815 if (ret != -1) {
3816 if ((st_mode & S_IFMT) == S_IFDIR) {
3817 errno = EISDIR;
3818 ::close(fd);
3819 return -1;
3820 }
3821 } else {
3822 ::close(fd);
3823 return -1;
3824 }
3825 }
3826
3827 /*
3828 * All file descriptors that are opened in the JVM and not
3829 * specifically destined for a subprocess should have the
3830 * close-on-exec flag set. If we don't set it, then careless 3rd
3831 * party native code might fork and exec without closing all
3832 * appropriate file descriptors (e.g. as we do in closeDescriptors in
3833 * UNIXProcess.c), and this in turn might:
3834 *
3835 * - cause end-of-file to fail to be detected on some file
3836 * descriptors, resulting in mysterious hangs, or
3837 *
3838 * - might cause an fopen in the subprocess to fail on a system
3839 * suffering from bug 1085341.
3840 *
3841 * (Yes, the default setting of the close-on-exec flag is a Unix
3842 * design flaw)
3843 *
3844 * See:
3845 * 1085341: 32-bit stdio routines should support file descriptors >255
3846 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3847 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3848 */
3849 #ifdef FD_CLOEXEC
3850 {
3851 int flags = ::fcntl(fd, F_GETFD);
3852 if (flags != -1)
3853 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3854 }
3855 #endif
3856
3857 if (o_delete != 0) {
3858 ::unlink(path);
3859 }
3860 return fd;
3861 }
3862
3863
3864 // create binary file, rewriting existing file if required
3865 int os::create_binary_file(const char* path, bool rewrite_existing) {
3866 int oflags = O_WRONLY | O_CREAT;
3867 if (!rewrite_existing) {
3868 oflags |= O_EXCL;
3869 }
3870 return ::open(path, oflags, S_IREAD | S_IWRITE);
3871 }
3872
3873 // return current position of file pointer
3874 jlong os::current_file_offset(int fd) {
3875 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3876 }
3877
3878 // move file pointer to the specified offset
3879 jlong os::seek_to_file_offset(int fd, jlong offset) {
3880 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3881 }
3882
3883 // This code originates from JDK's sysAvailable
3884 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3885
3886 int os::available(int fd, jlong *bytes) {
3887 jlong cur, end;
3888 int mode;
3889 struct stat buf;
3890
3891 if (::fstat(fd, &buf) >= 0) {
3892 mode = buf.st_mode;
3893 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3894 /*
3895 * XXX: is the following call interruptible? If so, this might
3896 * need to go through the INTERRUPT_IO() wrapper as for other
3897 * blocking, interruptible calls in this file.
3898 */
3899 int n;
3900 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3901 *bytes = n;
3902 return 1;
3903 }
3904 }
3905 }
3906 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3907 return 0;
3908 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3909 return 0;
3910 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3911 return 0;
3912 }
3913 *bytes = end - cur;
3914 return 1;
3915 }
3916
3917 int os::socket_available(int fd, jint *pbytes) {
3918 if (fd < 0)
3919 return OS_OK;
3920
3921 int ret;
3922
3923 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
3924
3925 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
3926 // is expected to return 0 on failure and 1 on success to the jdk.
3927
3928 return (ret == OS_ERR) ? 0 : 1;
3929 }
3930
3931 // Map a block of memory.
3932 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3933 char *addr, size_t bytes, bool read_only,
3934 bool allow_exec) {
3935 int prot;
3936 int flags;
3937
3938 if (read_only) {
3939 prot = PROT_READ;
3940 flags = MAP_SHARED;
3941 } else {
3942 prot = PROT_READ | PROT_WRITE;
3943 flags = MAP_PRIVATE;
3944 }
3945
3946 if (allow_exec) {
3947 prot |= PROT_EXEC;
3948 }
3949
3950 if (addr != NULL) {
3951 flags |= MAP_FIXED;
3952 }
3953
3954 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3955 fd, file_offset);
3956 if (mapped_address == MAP_FAILED) {
3957 return NULL;
3958 }
3959 return mapped_address;
3960 }
3961
3962
3963 // Remap a block of memory.
3964 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3965 char *addr, size_t bytes, bool read_only,
3966 bool allow_exec) {
3967 // same as map_memory() on this OS
3968 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3969 allow_exec);
3970 }
3971
3972
3973 // Unmap a block of memory.
3974 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3975 return munmap(addr, bytes) == 0;
3976 }
3977
3978 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3979 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3980 // of a thread.
3981 //
3982 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3983 // the fast estimate available on the platform.
3984
3985 jlong os::current_thread_cpu_time() {
3986 #ifdef __APPLE__
3987 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3988 #else
3989 Unimplemented();
3990 return 0;
3991 #endif
3992 }
3993
3994 jlong os::thread_cpu_time(Thread* thread) {
3995 #ifdef __APPLE__
3996 return os::thread_cpu_time(thread, true /* user + sys */);
3997 #else
3998 Unimplemented();
3999 return 0;
4000 #endif
4001 }
4002
4003 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4004 #ifdef __APPLE__
4005 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4006 #else
4007 Unimplemented();
4008 return 0;
4009 #endif
4010 }
4011
4012 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4013 #ifdef __APPLE__
4014 struct thread_basic_info tinfo;
4015 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
4016 kern_return_t kr;
4017 thread_t mach_thread;
4018
4019 mach_thread = thread->osthread()->thread_id();
4020 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
4021 if (kr != KERN_SUCCESS)
4022 return -1;
4023
4024 if (user_sys_cpu_time) {
4025 jlong nanos;
4026 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
4027 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
4028 return nanos;
4029 } else {
4030 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
4031 }
4032 #else
4033 Unimplemented();
4034 return 0;
4035 #endif
4036 }
4037
4038
4039 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4040 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4041 info_ptr->may_skip_backward = false; // elapsed time not wall time
4042 info_ptr->may_skip_forward = false; // elapsed time not wall time
4043 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4044 }
4045
4046 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4047 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4048 info_ptr->may_skip_backward = false; // elapsed time not wall time
4049 info_ptr->may_skip_forward = false; // elapsed time not wall time
4050 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4051 }
4052
4053 bool os::is_thread_cpu_time_supported() {
4054 #ifdef __APPLE__
4055 return true;
4056 #else
4057 return false;
4058 #endif
4059 }
4060
4061 // System loadavg support. Returns -1 if load average cannot be obtained.
4062 // Bsd doesn't yet have a (official) notion of processor sets,
4063 // so just return the system wide load average.
4064 int os::loadavg(double loadavg[], int nelem) {
4065 return ::getloadavg(loadavg, nelem);
4066 }
4067
4068 void os::pause() {
4069 char filename[MAX_PATH];
4070 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4071 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4072 } else {
4073 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4074 }
4075
4076 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4077 if (fd != -1) {
4078 struct stat buf;
4079 ::close(fd);
4080 while (::stat(filename, &buf) == 0) {
4081 (void)::poll(NULL, 0, 100);
4082 }
4083 } else {
4084 jio_fprintf(stderr,
4085 "Could not open pause file '%s', continuing immediately.\n", filename);
4086 }
4087 }
4088
4089
4090 // Refer to the comments in os_solaris.cpp park-unpark.
4091 //
4092 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4093 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4094 // For specifics regarding the bug see GLIBC BUGID 261237 :
4095 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4096 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4097 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4098 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4099 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4100 // and monitorenter when we're using 1-0 locking. All those operations may result in
4101 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4102 // of libpthread avoids the problem, but isn't practical.
4103 //
4104 // Possible remedies:
4105 //
4106 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4107 // This is palliative and probabilistic, however. If the thread is preempted
4108 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4109 // than the minimum period may have passed, and the abstime may be stale (in the
4110 // past) resultin in a hang. Using this technique reduces the odds of a hang
4111 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4112 //
4113 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4114 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4115 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4116 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4117 // thread.
4118 //
4119 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4120 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4121 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4122 // This also works well. In fact it avoids kernel-level scalability impediments
4123 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4124 // timers in a graceful fashion.
4125 //
4126 // 4. When the abstime value is in the past it appears that control returns
4127 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4128 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4129 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4130 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4131 // It may be possible to avoid reinitialization by checking the return
4132 // value from pthread_cond_timedwait(). In addition to reinitializing the
4133 // condvar we must establish the invariant that cond_signal() is only called
4134 // within critical sections protected by the adjunct mutex. This prevents
4135 // cond_signal() from "seeing" a condvar that's in the midst of being
4136 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4137 // desirable signal-after-unlock optimization that avoids futile context switching.
4138 //
4139 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4140 // structure when a condvar is used or initialized. cond_destroy() would
4141 // release the helper structure. Our reinitialize-after-timedwait fix
4142 // put excessive stress on malloc/free and locks protecting the c-heap.
4143 //
4144 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4145 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4146 // and only enabling the work-around for vulnerable environments.
4147
4148 // utility to compute the abstime argument to timedwait:
4149 // millis is the relative timeout time
4150 // abstime will be the absolute timeout time
4151 // TODO: replace compute_abstime() with unpackTime()
4152
4153 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) {
4154 if (millis < 0) millis = 0;
4155 struct timeval now;
4156 int status = gettimeofday(&now, NULL);
4157 assert(status == 0, "gettimeofday");
4158 jlong seconds = millis / 1000;
4159 millis %= 1000;
4160 if (seconds > 50000000) { // see man cond_timedwait(3T)
4161 seconds = 50000000;
4162 }
4163 abstime->tv_sec = now.tv_sec + seconds;
4164 long usec = now.tv_usec + millis * 1000;
4165 if (usec >= 1000000) {
4166 abstime->tv_sec += 1;
4167 usec -= 1000000;
4168 }
4169 abstime->tv_nsec = usec * 1000;
4170 return abstime;
4171 }
4172
4173
4174 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4175 // Conceptually TryPark() should be equivalent to park(0).
4176
4177 int os::PlatformEvent::TryPark() {
4178 for (;;) {
4179 const int v = _Event ;
4180 guarantee ((v == 0) || (v == 1), "invariant") ;
4181 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
4182 }
4183 }
4184
4185 void os::PlatformEvent::park() { // AKA "down()"
4186 // Invariant: Only the thread associated with the Event/PlatformEvent
4187 // may call park().
4188 // TODO: assert that _Assoc != NULL or _Assoc == Self
4189 int v ;
4190 for (;;) {
4191 v = _Event ;
4192 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4193 }
4194 guarantee (v >= 0, "invariant") ;
4195 if (v == 0) {
4196 // Do this the hard way by blocking ...
4197 int status = pthread_mutex_lock(_mutex);
4198 assert_status(status == 0, status, "mutex_lock");
4199 guarantee (_nParked == 0, "invariant") ;
4200 ++ _nParked ;
4201 while (_Event < 0) {
4202 status = pthread_cond_wait(_cond, _mutex);
4203 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4204 // Treat this the same as if the wait was interrupted
4205 if (status == ETIMEDOUT) { status = EINTR; }
4206 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4207 }
4208 -- _nParked ;
4209
4210 _Event = 0 ;
4211 status = pthread_mutex_unlock(_mutex);
4212 assert_status(status == 0, status, "mutex_unlock");
4213 // Paranoia to ensure our locked and lock-free paths interact
4214 // correctly with each other.
4215 OrderAccess::fence();
4216 }
4217 guarantee (_Event >= 0, "invariant") ;
4218 }
4219
4220 int os::PlatformEvent::park(jlong millis) {
4221 guarantee (_nParked == 0, "invariant") ;
4222
4223 int v ;
4224 for (;;) {
4225 v = _Event ;
4226 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4227 }
4228 guarantee (v >= 0, "invariant") ;
4229 if (v != 0) return OS_OK ;
4230
4231 // We do this the hard way, by blocking the thread.
4232 // Consider enforcing a minimum timeout value.
4233 struct timespec abst;
4234 compute_abstime(&abst, millis);
4235
4236 int ret = OS_TIMEOUT;
4237 int status = pthread_mutex_lock(_mutex);
4238 assert_status(status == 0, status, "mutex_lock");
4239 guarantee (_nParked == 0, "invariant") ;
4240 ++_nParked ;
4241
4242 // Object.wait(timo) will return because of
4243 // (a) notification
4244 // (b) timeout
4245 // (c) thread.interrupt
4246 //
4247 // Thread.interrupt and object.notify{All} both call Event::set.
4248 // That is, we treat thread.interrupt as a special case of notification.
4249 // The underlying Solaris implementation, cond_timedwait, admits
4250 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4251 // JVM from making those visible to Java code. As such, we must
4252 // filter out spurious wakeups. We assume all ETIME returns are valid.
4253 //
4254 // TODO: properly differentiate simultaneous notify+interrupt.
4255 // In that case, we should propagate the notify to another waiter.
4256
4257 while (_Event < 0) {
4258 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst);
4259 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4260 pthread_cond_destroy (_cond);
4261 pthread_cond_init (_cond, NULL) ;
4262 }
4263 assert_status(status == 0 || status == EINTR ||
4264 status == ETIMEDOUT,
4265 status, "cond_timedwait");
4266 if (!FilterSpuriousWakeups) break ; // previous semantics
4267 if (status == ETIMEDOUT) break ;
4268 // We consume and ignore EINTR and spurious wakeups.
4269 }
4270 --_nParked ;
4271 if (_Event >= 0) {
4272 ret = OS_OK;
4273 }
4274 _Event = 0 ;
4275 status = pthread_mutex_unlock(_mutex);
4276 assert_status(status == 0, status, "mutex_unlock");
4277 assert (_nParked == 0, "invariant") ;
4278 // Paranoia to ensure our locked and lock-free paths interact
4279 // correctly with each other.
4280 OrderAccess::fence();
4281 return ret;
4282 }
4283
4284 void os::PlatformEvent::unpark() {
4285 // Transitions for _Event:
4286 // 0 :=> 1
4287 // 1 :=> 1
4288 // -1 :=> either 0 or 1; must signal target thread
4289 // That is, we can safely transition _Event from -1 to either
4290 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4291 // unpark() calls.
4292 // See also: "Semaphores in Plan 9" by Mullender & Cox
4293 //
4294 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4295 // that it will take two back-to-back park() calls for the owning
4296 // thread to block. This has the benefit of forcing a spurious return
4297 // from the first park() call after an unpark() call which will help
4298 // shake out uses of park() and unpark() without condition variables.
4299
4300 if (Atomic::xchg(1, &_Event) >= 0) return;
4301
4302 // Wait for the thread associated with the event to vacate
4303 int status = pthread_mutex_lock(_mutex);
4304 assert_status(status == 0, status, "mutex_lock");
4305 int AnyWaiters = _nParked;
4306 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4307 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) {
4308 AnyWaiters = 0;
4309 pthread_cond_signal(_cond);
4310 }
4311 status = pthread_mutex_unlock(_mutex);
4312 assert_status(status == 0, status, "mutex_unlock");
4313 if (AnyWaiters != 0) {
4314 status = pthread_cond_signal(_cond);
4315 assert_status(status == 0, status, "cond_signal");
4316 }
4317
4318 // Note that we signal() _after dropping the lock for "immortal" Events.
4319 // This is safe and avoids a common class of futile wakeups. In rare
4320 // circumstances this can cause a thread to return prematurely from
4321 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4322 // simply re-test the condition and re-park itself.
4323 }
4324
4325
4326 // JSR166
4327 // -------------------------------------------------------
4328
4329 /*
4330 * The solaris and bsd implementations of park/unpark are fairly
4331 * conservative for now, but can be improved. They currently use a
4332 * mutex/condvar pair, plus a a count.
4333 * Park decrements count if > 0, else does a condvar wait. Unpark
4334 * sets count to 1 and signals condvar. Only one thread ever waits
4335 * on the condvar. Contention seen when trying to park implies that someone
4336 * is unparking you, so don't wait. And spurious returns are fine, so there
4337 * is no need to track notifications.
4338 */
4339
4340 #define MAX_SECS 100000000
4341 /*
4342 * This code is common to bsd and solaris and will be moved to a
4343 * common place in dolphin.
4344 *
4345 * The passed in time value is either a relative time in nanoseconds
4346 * or an absolute time in milliseconds. Either way it has to be unpacked
4347 * into suitable seconds and nanoseconds components and stored in the
4348 * given timespec structure.
4349 * Given time is a 64-bit value and the time_t used in the timespec is only
4350 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4351 * overflow if times way in the future are given. Further on Solaris versions
4352 * prior to 10 there is a restriction (see cond_timedwait) that the specified
4353 * number of seconds, in abstime, is less than current_time + 100,000,000.
4354 * As it will be 28 years before "now + 100000000" will overflow we can
4355 * ignore overflow and just impose a hard-limit on seconds using the value
4356 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
4357 * years from "now".
4358 */
4359
4360 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4361 assert (time > 0, "convertTime");
4362
4363 struct timeval now;
4364 int status = gettimeofday(&now, NULL);
4365 assert(status == 0, "gettimeofday");
4366
4367 time_t max_secs = now.tv_sec + MAX_SECS;
4368
4369 if (isAbsolute) {
4370 jlong secs = time / 1000;
4371 if (secs > max_secs) {
4372 absTime->tv_sec = max_secs;
4373 }
4374 else {
4375 absTime->tv_sec = secs;
4376 }
4377 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4378 }
4379 else {
4380 jlong secs = time / NANOSECS_PER_SEC;
4381 if (secs >= MAX_SECS) {
4382 absTime->tv_sec = max_secs;
4383 absTime->tv_nsec = 0;
4384 }
4385 else {
4386 absTime->tv_sec = now.tv_sec + secs;
4387 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4388 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4389 absTime->tv_nsec -= NANOSECS_PER_SEC;
4390 ++absTime->tv_sec; // note: this must be <= max_secs
4391 }
4392 }
4393 }
4394 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4395 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4396 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4397 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4398 }
4399
4400 void Parker::park(bool isAbsolute, jlong time) {
4401 // Ideally we'd do something useful while spinning, such
4402 // as calling unpackTime().
4403
4404 // Optional fast-path check:
4405 // Return immediately if a permit is available.
4406 // We depend on Atomic::xchg() having full barrier semantics
4407 // since we are doing a lock-free update to _counter.
4408 if (Atomic::xchg(0, &_counter) > 0) return;
4409
4410 Thread* thread = Thread::current();
4411 assert(thread->is_Java_thread(), "Must be JavaThread");
4412 JavaThread *jt = (JavaThread *)thread;
4413
4414 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4415 // Check interrupt before trying to wait
4416 if (Thread::is_interrupted(thread, false)) {
4417 return;
4418 }
4419
4420 // Next, demultiplex/decode time arguments
4421 struct timespec absTime;
4422 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
4423 return;
4424 }
4425 if (time > 0) {
4426 unpackTime(&absTime, isAbsolute, time);
4427 }
4428
4429
4430 // Enter safepoint region
4431 // Beware of deadlocks such as 6317397.
4432 // The per-thread Parker:: mutex is a classic leaf-lock.
4433 // In particular a thread must never block on the Threads_lock while
4434 // holding the Parker:: mutex. If safepoints are pending both the
4435 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4436 ThreadBlockInVM tbivm(jt);
4437
4438 // Don't wait if cannot get lock since interference arises from
4439 // unblocking. Also. check interrupt before trying wait
4440 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4441 return;
4442 }
4443
4444 int status ;
4445 if (_counter > 0) { // no wait needed
4446 _counter = 0;
4447 status = pthread_mutex_unlock(_mutex);
4448 assert (status == 0, "invariant") ;
4449 // Paranoia to ensure our locked and lock-free paths interact
4450 // correctly with each other and Java-level accesses.
4451 OrderAccess::fence();
4452 return;
4453 }
4454
4455 #ifdef ASSERT
4456 // Don't catch signals while blocked; let the running threads have the signals.
4457 // (This allows a debugger to break into the running thread.)
4458 sigset_t oldsigs;
4459 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4460 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4461 #endif
4462
4463 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4464 jt->set_suspend_equivalent();
4465 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4466
4467 if (time == 0) {
4468 status = pthread_cond_wait (_cond, _mutex) ;
4469 } else {
4470 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ;
4471 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4472 pthread_cond_destroy (_cond) ;
4473 pthread_cond_init (_cond, NULL);
4474 }
4475 }
4476 assert_status(status == 0 || status == EINTR ||
4477 status == ETIMEDOUT,
4478 status, "cond_timedwait");
4479
4480 #ifdef ASSERT
4481 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4482 #endif
4483
4484 _counter = 0 ;
4485 status = pthread_mutex_unlock(_mutex) ;
4486 assert_status(status == 0, status, "invariant") ;
4487 // Paranoia to ensure our locked and lock-free paths interact
4488 // correctly with each other and Java-level accesses.
4489 OrderAccess::fence();
4490
4491 // If externally suspended while waiting, re-suspend
4492 if (jt->handle_special_suspend_equivalent_condition()) {
4493 jt->java_suspend_self();
4494 }
4495 }
4496
4497 void Parker::unpark() {
4498 int s, status ;
4499 status = pthread_mutex_lock(_mutex);
4500 assert (status == 0, "invariant") ;
4501 s = _counter;
4502 _counter = 1;
4503 if (s < 1) {
4504 if (WorkAroundNPTLTimedWaitHang) {
4505 status = pthread_cond_signal (_cond) ;
4506 assert (status == 0, "invariant") ;
4507 status = pthread_mutex_unlock(_mutex);
4508 assert (status == 0, "invariant") ;
4509 } else {
4510 status = pthread_mutex_unlock(_mutex);
4511 assert (status == 0, "invariant") ;
4512 status = pthread_cond_signal (_cond) ;
4513 assert (status == 0, "invariant") ;
4514 }
4515 } else {
4516 pthread_mutex_unlock(_mutex);
4517 assert (status == 0, "invariant") ;
4518 }
4519 }
4520
4521
4522 /* Darwin has no "environ" in a dynamic library. */
4523 #ifdef __APPLE__
4524 #include <crt_externs.h>
4525 #define environ (*_NSGetEnviron())
4526 #else
4527 extern char** environ;
4528 #endif
4529
4530 // Run the specified command in a separate process. Return its exit value,
4531 // or -1 on failure (e.g. can't fork a new process).
4532 // Unlike system(), this function can be called from signal handler. It
4533 // doesn't block SIGINT et al.
4534 int os::fork_and_exec(char* cmd) {
4535 const char * argv[4] = {"sh", "-c", cmd, NULL};
4536
4537 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4538 // pthread_atfork handlers and reset pthread library. All we need is a
4539 // separate process to execve. Make a direct syscall to fork process.
4540 // On IA64 there's no fork syscall, we have to use fork() and hope for
4541 // the best...
4542 pid_t pid = fork();
4543
4544 if (pid < 0) {
4545 // fork failed
4546 return -1;
4547
4548 } else if (pid == 0) {
4549 // child process
4550
4551 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4552 // first to kill every thread on the thread list. Because this list is
4553 // not reset by fork() (see notes above), execve() will instead kill
4554 // every thread in the parent process. We know this is the only thread
4555 // in the new process, so make a system call directly.
4556 // IA64 should use normal execve() from glibc to match the glibc fork()
4557 // above.
4558 execve("/bin/sh", (char* const*)argv, environ);
4559
4560 // execve failed
4561 _exit(-1);
4562
4563 } else {
4564 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4565 // care about the actual exit code, for now.
4566
4567 int status;
4568
4569 // Wait for the child process to exit. This returns immediately if
4570 // the child has already exited. */
4571 while (waitpid(pid, &status, 0) < 0) {
4572 switch (errno) {
4573 case ECHILD: return 0;
4574 case EINTR: break;
4575 default: return -1;
4576 }
4577 }
4578
4579 if (WIFEXITED(status)) {
4580 // The child exited normally; get its exit code.
4581 return WEXITSTATUS(status);
4582 } else if (WIFSIGNALED(status)) {
4583 // The child exited because of a signal
4584 // The best value to return is 0x80 + signal number,
4585 // because that is what all Unix shells do, and because
4586 // it allows callers to distinguish between process exit and
4587 // process death by signal.
4588 return 0x80 + WTERMSIG(status);
4589 } else {
4590 // Unknown exit code; pass it through
4591 return status;
4592 }
4593 }
4594 }
4595
4596 // is_headless_jre()
4597 //
4598 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4599 // in order to report if we are running in a headless jre
4600 //
4601 // Since JDK8 xawt/libmawt.so was moved into the same directory
4602 // as libawt.so, and renamed libawt_xawt.so
4603 //
4604 bool os::is_headless_jre() {
4605 #ifdef __APPLE__
4606 // We no longer build headless-only on Mac OS X
4607 return false;
4608 #else
4609 struct stat statbuf;
4610 char buf[MAXPATHLEN];
4611 char libmawtpath[MAXPATHLEN];
4612 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4613 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4614 char *p;
4615
4616 // Get path to libjvm.so
4617 os::jvm_path(buf, sizeof(buf));
4618
4619 // Get rid of libjvm.so
4620 p = strrchr(buf, '/');
4621 if (p == NULL) return false;
4622 else *p = '\0';
4623
4624 // Get rid of client or server
4625 p = strrchr(buf, '/');
4626 if (p == NULL) return false;
4627 else *p = '\0';
4628
4629 // check xawt/libmawt.so
4630 strcpy(libmawtpath, buf);
4631 strcat(libmawtpath, xawtstr);
4632 if (::stat(libmawtpath, &statbuf) == 0) return false;
4633
4634 // check libawt_xawt.so
4635 strcpy(libmawtpath, buf);
4636 strcat(libmawtpath, new_xawtstr);
4637 if (::stat(libmawtpath, &statbuf) == 0) return false;
4638
4639 return true;
4640 #endif
4641 }
4642
4643 // Get the default path to the core file
4644 // Returns the length of the string
4645 int os::get_core_path(char* buffer, size_t bufferSize) {
4646 int n = jio_snprintf(buffer, bufferSize, "/cores");
4647
4648 // Truncate if theoretical string was longer than bufferSize
4649 n = MIN2(n, (int)bufferSize);
4650
4651 return n;
4652 }
4653
4654 #ifndef PRODUCT
4655 void TestReserveMemorySpecial_test() {
4656 // No tests available for this platform
4657 }
4658 #endif