1 /*
2 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_bsd.h"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "mutex_bsd.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_bsd.inline.hpp"
41 #include "os_share_bsd.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.inline.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "semaphore_bsd.hpp"
64 #include "services/attachListener.hpp"
65 #include "services/memTracker.hpp"
66 #include "services/runtimeService.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/vmError.hpp"
72
73 // put OS-includes here
74 # include <sys/types.h>
75 # include <sys/mman.h>
76 # include <sys/stat.h>
77 # include <sys/select.h>
78 # include <pthread.h>
79 # include <signal.h>
80 # include <errno.h>
81 # include <dlfcn.h>
82 # include <stdio.h>
83 # include <unistd.h>
84 # include <sys/resource.h>
85 # include <pthread.h>
86 # include <sys/stat.h>
87 # include <sys/time.h>
88 # include <sys/times.h>
89 # include <sys/utsname.h>
90 # include <sys/socket.h>
91 # include <sys/wait.h>
92 # include <time.h>
93 # include <pwd.h>
94 # include <poll.h>
95 # include <semaphore.h>
96 # include <fcntl.h>
97 # include <string.h>
98 # include <sys/param.h>
99 # include <sys/sysctl.h>
100 # include <sys/ipc.h>
101 # include <sys/shm.h>
102 #ifndef __APPLE__
103 # include <link.h>
104 #endif
105 # include <stdint.h>
106 # include <inttypes.h>
107 # include <sys/ioctl.h>
108 # include <sys/syscall.h>
109
110 #if defined(__FreeBSD__) || defined(__NetBSD__)
111 #include <elf.h>
112 #endif
113
114 #ifdef __APPLE__
115 #include <mach/mach.h> // semaphore_* API
116 #include <mach-o/dyld.h>
117 #include <sys/proc_info.h>
118 #include <objc/objc-auto.h>
119 #endif
120
121 #ifndef MAP_ANONYMOUS
122 #define MAP_ANONYMOUS MAP_ANON
123 #endif
124
125 #define MAX_PATH (2 * K)
126
127 // for timer info max values which include all bits
128 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
129
130 #define LARGEPAGES_BIT (1 << 6)
131
132 ////////////////////////////////////////////////////////////////////////////////
133 // global variables
134 julong os::Bsd::_physical_memory = 0;
135
136 #ifdef __APPLE__
137 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
138 volatile uint64_t os::Bsd::_max_abstime = 0;
139 #else
140 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
141 #endif
142 pthread_t os::Bsd::_main_thread;
143 int os::Bsd::_page_size = -1;
144
145 static jlong initial_time_count=0;
146
147 static int clock_tics_per_sec = 100;
148
149 // For diagnostics to print a message once. see run_periodic_checks
150 static sigset_t check_signal_done;
151 static bool check_signals = true;
152
153 static pid_t _initial_pid = 0;
154
155 // Signal number used to suspend/resume a thread
156
157 // do not use any signal number less than SIGSEGV, see 4355769
158 static int SR_signum = SIGUSR2;
159 sigset_t SR_sigset;
160
161
162 ////////////////////////////////////////////////////////////////////////////////
163 // utility functions
164
165 static int SR_initialize();
166 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
167
168 julong os::available_memory() {
169 return Bsd::available_memory();
170 }
171
172 // available here means free
173 julong os::Bsd::available_memory() {
174 uint64_t available = physical_memory() >> 2;
175 #ifdef __APPLE__
176 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
177 vm_statistics64_data_t vmstat;
178 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
179 (host_info64_t)&vmstat, &count);
180 assert(kerr == KERN_SUCCESS,
181 "host_statistics64 failed - check mach_host_self() and count");
182 if (kerr == KERN_SUCCESS) {
183 available = vmstat.free_count * os::vm_page_size();
184 }
185 #endif
186 return available;
187 }
188
189 julong os::physical_memory() {
190 return Bsd::physical_memory();
191 }
192
193 // Return true if user is running as root.
194
195 bool os::have_special_privileges() {
196 static bool init = false;
197 static bool privileges = false;
198 if (!init) {
199 privileges = (getuid() != geteuid()) || (getgid() != getegid());
200 init = true;
201 }
202 return privileges;
203 }
204
205
206
207 // Cpu architecture string
208 #if defined(ZERO)
209 static char cpu_arch[] = ZERO_LIBARCH;
210 #elif defined(IA64)
211 static char cpu_arch[] = "ia64";
212 #elif defined(IA32)
213 static char cpu_arch[] = "i386";
214 #elif defined(AMD64)
215 static char cpu_arch[] = "amd64";
216 #elif defined(ARM)
217 static char cpu_arch[] = "arm";
218 #elif defined(PPC32)
219 static char cpu_arch[] = "ppc";
220 #elif defined(SPARC)
221 #ifdef _LP64
222 static char cpu_arch[] = "sparcv9";
223 #else
224 static char cpu_arch[] = "sparc";
225 #endif
226 #else
227 #error Add appropriate cpu_arch setting
228 #endif
229
230 // Compiler variant
231 #ifdef COMPILER2
232 #define COMPILER_VARIANT "server"
233 #else
234 #define COMPILER_VARIANT "client"
235 #endif
236
237
238 void os::Bsd::initialize_system_info() {
239 int mib[2];
240 size_t len;
241 int cpu_val;
242 julong mem_val;
243
244 // get processors count via hw.ncpus sysctl
245 mib[0] = CTL_HW;
246 mib[1] = HW_NCPU;
247 len = sizeof(cpu_val);
248 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
249 assert(len == sizeof(cpu_val), "unexpected data size");
250 set_processor_count(cpu_val);
251 } else {
252 set_processor_count(1); // fallback
253 }
254
255 // get physical memory via hw.memsize sysctl (hw.memsize is used
256 // since it returns a 64 bit value)
257 mib[0] = CTL_HW;
258
259 #if defined (HW_MEMSIZE) // Apple
260 mib[1] = HW_MEMSIZE;
261 #elif defined(HW_PHYSMEM) // Most of BSD
262 mib[1] = HW_PHYSMEM;
263 #elif defined(HW_REALMEM) // Old FreeBSD
264 mib[1] = HW_REALMEM;
265 #else
266 #error No ways to get physmem
267 #endif
268
269 len = sizeof(mem_val);
270 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
271 assert(len == sizeof(mem_val), "unexpected data size");
272 _physical_memory = mem_val;
273 } else {
274 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
275 }
276
277 #ifdef __OpenBSD__
278 {
279 // limit _physical_memory memory view on OpenBSD since
280 // datasize rlimit restricts us anyway.
281 struct rlimit limits;
282 getrlimit(RLIMIT_DATA, &limits);
283 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
284 }
285 #endif
286 }
287
288 #ifdef __APPLE__
289 static const char *get_home() {
290 const char *home_dir = ::getenv("HOME");
291 if ((home_dir == NULL) || (*home_dir == '\0')) {
292 struct passwd *passwd_info = getpwuid(geteuid());
293 if (passwd_info != NULL) {
294 home_dir = passwd_info->pw_dir;
295 }
296 }
297
298 return home_dir;
299 }
300 #endif
301
302 void os::init_system_properties_values() {
303 // The next steps are taken in the product version:
304 //
305 // Obtain the JAVA_HOME value from the location of libjvm.so.
306 // This library should be located at:
307 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
308 //
309 // If "/jre/lib/" appears at the right place in the path, then we
310 // assume libjvm.so is installed in a JDK and we use this path.
311 //
312 // Otherwise exit with message: "Could not create the Java virtual machine."
313 //
314 // The following extra steps are taken in the debugging version:
315 //
316 // If "/jre/lib/" does NOT appear at the right place in the path
317 // instead of exit check for $JAVA_HOME environment variable.
318 //
319 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
320 // then we append a fake suffix "hotspot/libjvm.so" to this path so
321 // it looks like libjvm.so is installed there
322 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
323 //
324 // Otherwise exit.
325 //
326 // Important note: if the location of libjvm.so changes this
327 // code needs to be changed accordingly.
328
329 // See ld(1):
330 // The linker uses the following search paths to locate required
331 // shared libraries:
332 // 1: ...
333 // ...
334 // 7: The default directories, normally /lib and /usr/lib.
335 #ifndef DEFAULT_LIBPATH
336 #define DEFAULT_LIBPATH "/lib:/usr/lib"
337 #endif
338
339 // Base path of extensions installed on the system.
340 #define SYS_EXT_DIR "/usr/java/packages"
341 #define EXTENSIONS_DIR "/lib/ext"
342
343 #ifndef __APPLE__
344
345 // Buffer that fits several sprintfs.
346 // Note that the space for the colon and the trailing null are provided
347 // by the nulls included by the sizeof operator.
348 const size_t bufsize =
349 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
350 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
351 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
352
353 // sysclasspath, java_home, dll_dir
354 {
355 char *pslash;
356 os::jvm_path(buf, bufsize);
357
358 // Found the full path to libjvm.so.
359 // Now cut the path to <java_home>/jre if we can.
360 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
361 pslash = strrchr(buf, '/');
362 if (pslash != NULL) {
363 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
364 }
365 Arguments::set_dll_dir(buf);
366
367 if (pslash != NULL) {
368 pslash = strrchr(buf, '/');
369 if (pslash != NULL) {
370 *pslash = '\0'; // Get rid of /<arch>.
371 pslash = strrchr(buf, '/');
372 if (pslash != NULL) {
373 *pslash = '\0'; // Get rid of /lib.
374 }
375 }
376 }
377 Arguments::set_java_home(buf);
378 set_boot_path('/', ':');
379 }
380
381 // Where to look for native libraries.
382 //
383 // Note: Due to a legacy implementation, most of the library path
384 // is set in the launcher. This was to accomodate linking restrictions
385 // on legacy Bsd implementations (which are no longer supported).
386 // Eventually, all the library path setting will be done here.
387 //
388 // However, to prevent the proliferation of improperly built native
389 // libraries, the new path component /usr/java/packages is added here.
390 // Eventually, all the library path setting will be done here.
391 {
392 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
393 // should always exist (until the legacy problem cited above is
394 // addressed).
395 const char *v = ::getenv("LD_LIBRARY_PATH");
396 const char *v_colon = ":";
397 if (v == NULL) { v = ""; v_colon = ""; }
398 // That's +1 for the colon and +1 for the trailing '\0'.
399 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
400 strlen(v) + 1 +
401 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
402 mtInternal);
403 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
404 Arguments::set_library_path(ld_library_path);
405 FREE_C_HEAP_ARRAY(char, ld_library_path);
406 }
407
408 // Extensions directories.
409 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
410 Arguments::set_ext_dirs(buf);
411
412 FREE_C_HEAP_ARRAY(char, buf);
413
414 #else // __APPLE__
415
416 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
417 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
418
419 const char *user_home_dir = get_home();
420 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
421 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
422 sizeof(SYS_EXTENSIONS_DIRS);
423
424 // Buffer that fits several sprintfs.
425 // Note that the space for the colon and the trailing null are provided
426 // by the nulls included by the sizeof operator.
427 const size_t bufsize =
428 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
429 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
430 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
431
432 // sysclasspath, java_home, dll_dir
433 {
434 char *pslash;
435 os::jvm_path(buf, bufsize);
436
437 // Found the full path to libjvm.so.
438 // Now cut the path to <java_home>/jre if we can.
439 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
440 pslash = strrchr(buf, '/');
441 if (pslash != NULL) {
442 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
443 }
444 #ifdef STATIC_BUILD
445 strcat(buf, "/lib");
446 #endif
447
448 Arguments::set_dll_dir(buf);
449
450 if (pslash != NULL) {
451 pslash = strrchr(buf, '/');
452 if (pslash != NULL) {
453 *pslash = '\0'; // Get rid of /lib.
454 }
455 }
456 Arguments::set_java_home(buf);
457 set_boot_path('/', ':');
458 }
459
460 // Where to look for native libraries.
461 //
462 // Note: Due to a legacy implementation, most of the library path
463 // is set in the launcher. This was to accomodate linking restrictions
464 // on legacy Bsd implementations (which are no longer supported).
465 // Eventually, all the library path setting will be done here.
466 //
467 // However, to prevent the proliferation of improperly built native
468 // libraries, the new path component /usr/java/packages is added here.
469 // Eventually, all the library path setting will be done here.
470 {
471 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
472 // should always exist (until the legacy problem cited above is
473 // addressed).
474 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
475 // can specify a directory inside an app wrapper
476 const char *l = ::getenv("JAVA_LIBRARY_PATH");
477 const char *l_colon = ":";
478 if (l == NULL) { l = ""; l_colon = ""; }
479
480 const char *v = ::getenv("DYLD_LIBRARY_PATH");
481 const char *v_colon = ":";
482 if (v == NULL) { v = ""; v_colon = ""; }
483
484 // Apple's Java6 has "." at the beginning of java.library.path.
485 // OpenJDK on Windows has "." at the end of java.library.path.
486 // OpenJDK on Linux and Solaris don't have "." in java.library.path
487 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
488 // "." is appended to the end of java.library.path. Yes, this
489 // could cause a change in behavior, but Apple's Java6 behavior
490 // can be achieved by putting "." at the beginning of the
491 // JAVA_LIBRARY_PATH environment variable.
492 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
493 strlen(v) + 1 + strlen(l) + 1 +
494 system_ext_size + 3,
495 mtInternal);
496 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
497 v, v_colon, l, l_colon, user_home_dir);
498 Arguments::set_library_path(ld_library_path);
499 FREE_C_HEAP_ARRAY(char, ld_library_path);
500 }
501
502 // Extensions directories.
503 //
504 // Note that the space for the colon and the trailing null are provided
505 // by the nulls included by the sizeof operator (so actually one byte more
506 // than necessary is allocated).
507 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
508 user_home_dir, Arguments::get_java_home());
509 Arguments::set_ext_dirs(buf);
510
511 FREE_C_HEAP_ARRAY(char, buf);
512
513 #undef SYS_EXTENSIONS_DIR
514 #undef SYS_EXTENSIONS_DIRS
515
516 #endif // __APPLE__
517
518 #undef SYS_EXT_DIR
519 #undef EXTENSIONS_DIR
520 }
521
522 ////////////////////////////////////////////////////////////////////////////////
523 // breakpoint support
524
525 void os::breakpoint() {
526 BREAKPOINT;
527 }
528
529 extern "C" void breakpoint() {
530 // use debugger to set breakpoint here
531 }
532
533 ////////////////////////////////////////////////////////////////////////////////
534 // signal support
535
536 debug_only(static bool signal_sets_initialized = false);
537 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
538
539 bool os::Bsd::is_sig_ignored(int sig) {
540 struct sigaction oact;
541 sigaction(sig, (struct sigaction*)NULL, &oact);
542 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
543 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
544 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
545 return true;
546 } else {
547 return false;
548 }
549 }
550
551 void os::Bsd::signal_sets_init() {
552 // Should also have an assertion stating we are still single-threaded.
553 assert(!signal_sets_initialized, "Already initialized");
554 // Fill in signals that are necessarily unblocked for all threads in
555 // the VM. Currently, we unblock the following signals:
556 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
557 // by -Xrs (=ReduceSignalUsage));
558 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
559 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
560 // the dispositions or masks wrt these signals.
561 // Programs embedding the VM that want to use the above signals for their
562 // own purposes must, at this time, use the "-Xrs" option to prevent
563 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
564 // (See bug 4345157, and other related bugs).
565 // In reality, though, unblocking these signals is really a nop, since
566 // these signals are not blocked by default.
567 sigemptyset(&unblocked_sigs);
568 sigemptyset(&allowdebug_blocked_sigs);
569 sigaddset(&unblocked_sigs, SIGILL);
570 sigaddset(&unblocked_sigs, SIGSEGV);
571 sigaddset(&unblocked_sigs, SIGBUS);
572 sigaddset(&unblocked_sigs, SIGFPE);
573 sigaddset(&unblocked_sigs, SR_signum);
574
575 if (!ReduceSignalUsage) {
576 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
577 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
578 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
579 }
580 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
581 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
582 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
583 }
584 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
585 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
586 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
587 }
588 }
589 // Fill in signals that are blocked by all but the VM thread.
590 sigemptyset(&vm_sigs);
591 if (!ReduceSignalUsage) {
592 sigaddset(&vm_sigs, BREAK_SIGNAL);
593 }
594 debug_only(signal_sets_initialized = true);
595
596 }
597
598 // These are signals that are unblocked while a thread is running Java.
599 // (For some reason, they get blocked by default.)
600 sigset_t* os::Bsd::unblocked_signals() {
601 assert(signal_sets_initialized, "Not initialized");
602 return &unblocked_sigs;
603 }
604
605 // These are the signals that are blocked while a (non-VM) thread is
606 // running Java. Only the VM thread handles these signals.
607 sigset_t* os::Bsd::vm_signals() {
608 assert(signal_sets_initialized, "Not initialized");
609 return &vm_sigs;
610 }
611
612 // These are signals that are blocked during cond_wait to allow debugger in
613 sigset_t* os::Bsd::allowdebug_blocked_signals() {
614 assert(signal_sets_initialized, "Not initialized");
615 return &allowdebug_blocked_sigs;
616 }
617
618 void os::Bsd::hotspot_sigmask(Thread* thread) {
619
620 //Save caller's signal mask before setting VM signal mask
621 sigset_t caller_sigmask;
622 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
623
624 OSThread* osthread = thread->osthread();
625 osthread->set_caller_sigmask(caller_sigmask);
626
627 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
628
629 if (!ReduceSignalUsage) {
630 if (thread->is_VM_thread()) {
631 // Only the VM thread handles BREAK_SIGNAL ...
632 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
633 } else {
634 // ... all other threads block BREAK_SIGNAL
635 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
636 }
637 }
638 }
639
640
641 //////////////////////////////////////////////////////////////////////////////
642 // create new thread
643
644 #ifdef __APPLE__
645 // library handle for calling objc_registerThreadWithCollector()
646 // without static linking to the libobjc library
647 #define OBJC_LIB "/usr/lib/libobjc.dylib"
648 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
649 typedef void (*objc_registerThreadWithCollector_t)();
650 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
651 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
652 #endif
653
654 #ifdef __APPLE__
655 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
656 // Additional thread_id used to correlate threads in SA
657 thread_identifier_info_data_t m_ident_info;
658 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
659
660 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
661 (thread_info_t) &m_ident_info, &count);
662
663 return m_ident_info.thread_id;
664 }
665 #endif
666
667 // Thread start routine for all newly created threads
668 static void *java_start(Thread *thread) {
669 // Try to randomize the cache line index of hot stack frames.
670 // This helps when threads of the same stack traces evict each other's
671 // cache lines. The threads can be either from the same JVM instance, or
672 // from different JVM instances. The benefit is especially true for
673 // processors with hyperthreading technology.
674 static int counter = 0;
675 int pid = os::current_process_id();
676 alloca(((pid ^ counter++) & 7) * 128);
677
678 thread->initialize_thread_current();
679
680 OSThread* osthread = thread->osthread();
681 Monitor* sync = osthread->startThread_lock();
682
683 osthread->set_thread_id(os::Bsd::gettid());
684
685 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
686 os::current_thread_id(), (uintx) pthread_self());
687
688 #ifdef __APPLE__
689 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
690 guarantee(unique_thread_id != 0, "unique thread id was not found");
691 osthread->set_unique_thread_id(unique_thread_id);
692 #endif
693 // initialize signal mask for this thread
694 os::Bsd::hotspot_sigmask(thread);
695
696 // initialize floating point control register
697 os::Bsd::init_thread_fpu_state();
698
699 #ifdef __APPLE__
700 // register thread with objc gc
701 if (objc_registerThreadWithCollectorFunction != NULL) {
702 objc_registerThreadWithCollectorFunction();
703 }
704 #endif
705
706 // handshaking with parent thread
707 {
708 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
709
710 // notify parent thread
711 osthread->set_state(INITIALIZED);
712 sync->notify_all();
713
714 // wait until os::start_thread()
715 while (osthread->get_state() == INITIALIZED) {
716 sync->wait(Mutex::_no_safepoint_check_flag);
717 }
718 }
719
720 // call one more level start routine
721 thread->run();
722
723 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
724 os::current_thread_id(), (uintx) pthread_self());
725
726 return 0;
727 }
728
729 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
730 assert(thread->osthread() == NULL, "caller responsible");
731
732 // Allocate the OSThread object
733 OSThread* osthread = new OSThread(NULL, NULL);
734 if (osthread == NULL) {
735 return false;
736 }
737
738 // set the correct thread state
739 osthread->set_thread_type(thr_type);
740
741 // Initial state is ALLOCATED but not INITIALIZED
742 osthread->set_state(ALLOCATED);
743
744 thread->set_osthread(osthread);
745
746 // init thread attributes
747 pthread_attr_t attr;
748 pthread_attr_init(&attr);
749 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
750
751 // calculate stack size if it's not specified by caller
752 if (stack_size == 0) {
753 stack_size = os::Bsd::default_stack_size(thr_type);
754
755 switch (thr_type) {
756 case os::java_thread:
757 // Java threads use ThreadStackSize which default value can be
758 // changed with the flag -Xss
759 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
760 stack_size = JavaThread::stack_size_at_create();
761 break;
762 case os::compiler_thread:
763 if (CompilerThreadStackSize > 0) {
764 stack_size = (size_t)(CompilerThreadStackSize * K);
765 break;
766 } // else fall through:
767 // use VMThreadStackSize if CompilerThreadStackSize is not defined
768 case os::vm_thread:
769 case os::pgc_thread:
770 case os::cgc_thread:
771 case os::watcher_thread:
772 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
773 break;
774 }
775 }
776
777 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
778 pthread_attr_setstacksize(&attr, stack_size);
779
780 ThreadState state;
781
782 {
783 pthread_t tid;
784 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
785
786 char buf[64];
787 if (ret == 0) {
788 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
789 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
790 } else {
791 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
792 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
793 }
794
795 pthread_attr_destroy(&attr);
796
797 if (ret != 0) {
798 // Need to clean up stuff we've allocated so far
799 thread->set_osthread(NULL);
800 delete osthread;
801 return false;
802 }
803
804 // Store pthread info into the OSThread
805 osthread->set_pthread_id(tid);
806
807 // Wait until child thread is either initialized or aborted
808 {
809 Monitor* sync_with_child = osthread->startThread_lock();
810 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
811 while ((state = osthread->get_state()) == ALLOCATED) {
812 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
813 }
814 }
815
816 }
817
818 // Aborted due to thread limit being reached
819 if (state == ZOMBIE) {
820 thread->set_osthread(NULL);
821 delete osthread;
822 return false;
823 }
824
825 // The thread is returned suspended (in state INITIALIZED),
826 // and is started higher up in the call chain
827 assert(state == INITIALIZED, "race condition");
828 return true;
829 }
830
831 /////////////////////////////////////////////////////////////////////////////
832 // attach existing thread
833
834 // bootstrap the main thread
835 bool os::create_main_thread(JavaThread* thread) {
836 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
837 return create_attached_thread(thread);
838 }
839
840 bool os::create_attached_thread(JavaThread* thread) {
841 #ifdef ASSERT
842 thread->verify_not_published();
843 #endif
844
845 // Allocate the OSThread object
846 OSThread* osthread = new OSThread(NULL, NULL);
847
848 if (osthread == NULL) {
849 return false;
850 }
851
852 osthread->set_thread_id(os::Bsd::gettid());
853
854 // Store pthread info into the OSThread
855 #ifdef __APPLE__
856 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
857 guarantee(unique_thread_id != 0, "just checking");
858 osthread->set_unique_thread_id(unique_thread_id);
859 #endif
860 osthread->set_pthread_id(::pthread_self());
861
862 // initialize floating point control register
863 os::Bsd::init_thread_fpu_state();
864
865 // Initial thread state is RUNNABLE
866 osthread->set_state(RUNNABLE);
867
868 thread->set_osthread(osthread);
869
870 // initialize signal mask for this thread
871 // and save the caller's signal mask
872 os::Bsd::hotspot_sigmask(thread);
873
874 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
875 os::current_thread_id(), (uintx) pthread_self());
876
877 return true;
878 }
879
880 void os::pd_start_thread(Thread* thread) {
881 OSThread * osthread = thread->osthread();
882 assert(osthread->get_state() != INITIALIZED, "just checking");
883 Monitor* sync_with_child = osthread->startThread_lock();
884 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
885 sync_with_child->notify();
886 }
887
888 // Free Bsd resources related to the OSThread
889 void os::free_thread(OSThread* osthread) {
890 assert(osthread != NULL, "osthread not set");
891
892 if (Thread::current()->osthread() == osthread) {
893 // Restore caller's signal mask
894 sigset_t sigmask = osthread->caller_sigmask();
895 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
896 }
897
898 delete osthread;
899 }
900
901 ////////////////////////////////////////////////////////////////////////////////
902 // time support
903
904 // Time since start-up in seconds to a fine granularity.
905 // Used by VMSelfDestructTimer and the MemProfiler.
906 double os::elapsedTime() {
907
908 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
909 }
910
911 jlong os::elapsed_counter() {
912 return javaTimeNanos() - initial_time_count;
913 }
914
915 jlong os::elapsed_frequency() {
916 return NANOSECS_PER_SEC; // nanosecond resolution
917 }
918
919 bool os::supports_vtime() { return true; }
920 bool os::enable_vtime() { return false; }
921 bool os::vtime_enabled() { return false; }
922
923 double os::elapsedVTime() {
924 // better than nothing, but not much
925 return elapsedTime();
926 }
927
928 jlong os::javaTimeMillis() {
929 timeval time;
930 int status = gettimeofday(&time, NULL);
931 assert(status != -1, "bsd error");
932 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
933 }
934
935 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
936 timeval time;
937 int status = gettimeofday(&time, NULL);
938 assert(status != -1, "bsd error");
939 seconds = jlong(time.tv_sec);
940 nanos = jlong(time.tv_usec) * 1000;
941 }
942
943 #ifndef __APPLE__
944 #ifndef CLOCK_MONOTONIC
945 #define CLOCK_MONOTONIC (1)
946 #endif
947 #endif
948
949 #ifdef __APPLE__
950 void os::Bsd::clock_init() {
951 mach_timebase_info(&_timebase_info);
952 }
953 #else
954 void os::Bsd::clock_init() {
955 struct timespec res;
956 struct timespec tp;
957 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
958 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
959 // yes, monotonic clock is supported
960 _clock_gettime = ::clock_gettime;
961 }
962 }
963 #endif
964
965
966
967 #ifdef __APPLE__
968
969 jlong os::javaTimeNanos() {
970 const uint64_t tm = mach_absolute_time();
971 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
972 const uint64_t prev = Bsd::_max_abstime;
973 if (now <= prev) {
974 return prev; // same or retrograde time;
975 }
976 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev);
977 assert(obsv >= prev, "invariant"); // Monotonicity
978 // If the CAS succeeded then we're done and return "now".
979 // If the CAS failed and the observed value "obsv" is >= now then
980 // we should return "obsv". If the CAS failed and now > obsv > prv then
981 // some other thread raced this thread and installed a new value, in which case
982 // we could either (a) retry the entire operation, (b) retry trying to install now
983 // or (c) just return obsv. We use (c). No loop is required although in some cases
984 // we might discard a higher "now" value in deference to a slightly lower but freshly
985 // installed obsv value. That's entirely benign -- it admits no new orderings compared
986 // to (a) or (b) -- and greatly reduces coherence traffic.
987 // We might also condition (c) on the magnitude of the delta between obsv and now.
988 // Avoiding excessive CAS operations to hot RW locations is critical.
989 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
990 return (prev == obsv) ? now : obsv;
991 }
992
993 #else // __APPLE__
994
995 jlong os::javaTimeNanos() {
996 if (os::supports_monotonic_clock()) {
997 struct timespec tp;
998 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
999 assert(status == 0, "gettime error");
1000 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
1001 return result;
1002 } else {
1003 timeval time;
1004 int status = gettimeofday(&time, NULL);
1005 assert(status != -1, "bsd error");
1006 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1007 return 1000 * usecs;
1008 }
1009 }
1010
1011 #endif // __APPLE__
1012
1013 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1014 if (os::supports_monotonic_clock()) {
1015 info_ptr->max_value = ALL_64_BITS;
1016
1017 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1018 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1019 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1020 } else {
1021 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1022 info_ptr->max_value = ALL_64_BITS;
1023
1024 // gettimeofday is a real time clock so it skips
1025 info_ptr->may_skip_backward = true;
1026 info_ptr->may_skip_forward = true;
1027 }
1028
1029 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1030 }
1031
1032 // Return the real, user, and system times in seconds from an
1033 // arbitrary fixed point in the past.
1034 bool os::getTimesSecs(double* process_real_time,
1035 double* process_user_time,
1036 double* process_system_time) {
1037 struct tms ticks;
1038 clock_t real_ticks = times(&ticks);
1039
1040 if (real_ticks == (clock_t) (-1)) {
1041 return false;
1042 } else {
1043 double ticks_per_second = (double) clock_tics_per_sec;
1044 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1045 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1046 *process_real_time = ((double) real_ticks) / ticks_per_second;
1047
1048 return true;
1049 }
1050 }
1051
1052
1053 char * os::local_time_string(char *buf, size_t buflen) {
1054 struct tm t;
1055 time_t long_time;
1056 time(&long_time);
1057 localtime_r(&long_time, &t);
1058 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1059 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1060 t.tm_hour, t.tm_min, t.tm_sec);
1061 return buf;
1062 }
1063
1064 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1065 return localtime_r(clock, res);
1066 }
1067
1068 ////////////////////////////////////////////////////////////////////////////////
1069 // runtime exit support
1070
1071 // Note: os::shutdown() might be called very early during initialization, or
1072 // called from signal handler. Before adding something to os::shutdown(), make
1073 // sure it is async-safe and can handle partially initialized VM.
1074 void os::shutdown() {
1075
1076 // allow PerfMemory to attempt cleanup of any persistent resources
1077 perfMemory_exit();
1078
1079 // needs to remove object in file system
1080 AttachListener::abort();
1081
1082 // flush buffered output, finish log files
1083 ostream_abort();
1084
1085 // Check for abort hook
1086 abort_hook_t abort_hook = Arguments::abort_hook();
1087 if (abort_hook != NULL) {
1088 abort_hook();
1089 }
1090
1091 }
1092
1093 // Note: os::abort() might be called very early during initialization, or
1094 // called from signal handler. Before adding something to os::abort(), make
1095 // sure it is async-safe and can handle partially initialized VM.
1096 void os::abort(bool dump_core, void* siginfo, const void* context) {
1097 os::shutdown();
1098 if (dump_core) {
1099 #ifndef PRODUCT
1100 fdStream out(defaultStream::output_fd());
1101 out.print_raw("Current thread is ");
1102 char buf[16];
1103 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1104 out.print_raw_cr(buf);
1105 out.print_raw_cr("Dumping core ...");
1106 #endif
1107 ::abort(); // dump core
1108 }
1109
1110 ::exit(1);
1111 }
1112
1113 // Die immediately, no exit hook, no abort hook, no cleanup.
1114 void os::die() {
1115 // _exit() on BsdThreads only kills current thread
1116 ::abort();
1117 }
1118
1119 // This method is a copy of JDK's sysGetLastErrorString
1120 // from src/solaris/hpi/src/system_md.c
1121
1122 size_t os::lasterror(char *buf, size_t len) {
1123 if (errno == 0) return 0;
1124
1125 const char *s = os::strerror(errno);
1126 size_t n = ::strlen(s);
1127 if (n >= len) {
1128 n = len - 1;
1129 }
1130 ::strncpy(buf, s, n);
1131 buf[n] = '\0';
1132 return n;
1133 }
1134
1135 // Information of current thread in variety of formats
1136 pid_t os::Bsd::gettid() {
1137 int retval = -1;
1138
1139 #ifdef __APPLE__ //XNU kernel
1140 // despite the fact mach port is actually not a thread id use it
1141 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1142 retval = ::pthread_mach_thread_np(::pthread_self());
1143 guarantee(retval != 0, "just checking");
1144 return retval;
1145
1146 #else
1147 #ifdef __FreeBSD__
1148 retval = syscall(SYS_thr_self);
1149 #else
1150 #ifdef __OpenBSD__
1151 retval = syscall(SYS_getthrid);
1152 #else
1153 #ifdef __NetBSD__
1154 retval = (pid_t) syscall(SYS__lwp_self);
1155 #endif
1156 #endif
1157 #endif
1158 #endif
1159
1160 if (retval == -1) {
1161 return getpid();
1162 }
1163 }
1164
1165 intx os::current_thread_id() {
1166 #ifdef __APPLE__
1167 return (intx)::pthread_mach_thread_np(::pthread_self());
1168 #else
1169 return (intx)::pthread_self();
1170 #endif
1171 }
1172
1173 int os::current_process_id() {
1174
1175 // Under the old bsd thread library, bsd gives each thread
1176 // its own process id. Because of this each thread will return
1177 // a different pid if this method were to return the result
1178 // of getpid(2). Bsd provides no api that returns the pid
1179 // of the launcher thread for the vm. This implementation
1180 // returns a unique pid, the pid of the launcher thread
1181 // that starts the vm 'process'.
1182
1183 // Under the NPTL, getpid() returns the same pid as the
1184 // launcher thread rather than a unique pid per thread.
1185 // Use gettid() if you want the old pre NPTL behaviour.
1186
1187 // if you are looking for the result of a call to getpid() that
1188 // returns a unique pid for the calling thread, then look at the
1189 // OSThread::thread_id() method in osThread_bsd.hpp file
1190
1191 return (int)(_initial_pid ? _initial_pid : getpid());
1192 }
1193
1194 // DLL functions
1195
1196 #define JNI_LIB_PREFIX "lib"
1197 #ifdef __APPLE__
1198 #define JNI_LIB_SUFFIX ".dylib"
1199 #else
1200 #define JNI_LIB_SUFFIX ".so"
1201 #endif
1202
1203 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1204
1205 // This must be hard coded because it's the system's temporary
1206 // directory not the java application's temp directory, ala java.io.tmpdir.
1207 #ifdef __APPLE__
1208 // macosx has a secure per-user temporary directory
1209 char temp_path_storage[PATH_MAX];
1210 const char* os::get_temp_directory() {
1211 static char *temp_path = NULL;
1212 if (temp_path == NULL) {
1213 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1214 if (pathSize == 0 || pathSize > PATH_MAX) {
1215 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1216 }
1217 temp_path = temp_path_storage;
1218 }
1219 return temp_path;
1220 }
1221 #else // __APPLE__
1222 const char* os::get_temp_directory() { return "/tmp"; }
1223 #endif // __APPLE__
1224
1225 static bool file_exists(const char* filename) {
1226 struct stat statbuf;
1227 if (filename == NULL || strlen(filename) == 0) {
1228 return false;
1229 }
1230 return os::stat(filename, &statbuf) == 0;
1231 }
1232
1233 bool os::dll_build_name(char* buffer, size_t buflen,
1234 const char* pname, const char* fname) {
1235 bool retval = false;
1236 // Copied from libhpi
1237 const size_t pnamelen = pname ? strlen(pname) : 0;
1238
1239 // Return error on buffer overflow.
1240 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1241 return retval;
1242 }
1243
1244 if (pnamelen == 0) {
1245 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1246 retval = true;
1247 } else if (strchr(pname, *os::path_separator()) != NULL) {
1248 int n;
1249 char** pelements = split_path(pname, &n);
1250 if (pelements == NULL) {
1251 return false;
1252 }
1253 for (int i = 0; i < n; i++) {
1254 // Really shouldn't be NULL, but check can't hurt
1255 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1256 continue; // skip the empty path values
1257 }
1258 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1259 pelements[i], fname);
1260 if (file_exists(buffer)) {
1261 retval = true;
1262 break;
1263 }
1264 }
1265 // release the storage
1266 for (int i = 0; i < n; i++) {
1267 if (pelements[i] != NULL) {
1268 FREE_C_HEAP_ARRAY(char, pelements[i]);
1269 }
1270 }
1271 if (pelements != NULL) {
1272 FREE_C_HEAP_ARRAY(char*, pelements);
1273 }
1274 } else {
1275 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1276 retval = true;
1277 }
1278 return retval;
1279 }
1280
1281 // check if addr is inside libjvm.so
1282 bool os::address_is_in_vm(address addr) {
1283 static address libjvm_base_addr;
1284 Dl_info dlinfo;
1285
1286 if (libjvm_base_addr == NULL) {
1287 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1288 libjvm_base_addr = (address)dlinfo.dli_fbase;
1289 }
1290 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1291 }
1292
1293 if (dladdr((void *)addr, &dlinfo) != 0) {
1294 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1295 }
1296
1297 return false;
1298 }
1299
1300
1301 #define MACH_MAXSYMLEN 256
1302
1303 bool os::dll_address_to_function_name(address addr, char *buf,
1304 int buflen, int *offset,
1305 bool demangle) {
1306 // buf is not optional, but offset is optional
1307 assert(buf != NULL, "sanity check");
1308
1309 Dl_info dlinfo;
1310 char localbuf[MACH_MAXSYMLEN];
1311
1312 if (dladdr((void*)addr, &dlinfo) != 0) {
1313 // see if we have a matching symbol
1314 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1315 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1316 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1317 }
1318 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1319 return true;
1320 }
1321 // no matching symbol so try for just file info
1322 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1323 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1324 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1325 return true;
1326 }
1327 }
1328
1329 // Handle non-dynamic manually:
1330 if (dlinfo.dli_fbase != NULL &&
1331 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1332 dlinfo.dli_fbase)) {
1333 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1334 jio_snprintf(buf, buflen, "%s", localbuf);
1335 }
1336 return true;
1337 }
1338 }
1339 buf[0] = '\0';
1340 if (offset != NULL) *offset = -1;
1341 return false;
1342 }
1343
1344 // ported from solaris version
1345 bool os::dll_address_to_library_name(address addr, char* buf,
1346 int buflen, int* offset) {
1347 // buf is not optional, but offset is optional
1348 assert(buf != NULL, "sanity check");
1349
1350 Dl_info dlinfo;
1351
1352 if (dladdr((void*)addr, &dlinfo) != 0) {
1353 if (dlinfo.dli_fname != NULL) {
1354 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1355 }
1356 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1357 *offset = addr - (address)dlinfo.dli_fbase;
1358 }
1359 return true;
1360 }
1361
1362 buf[0] = '\0';
1363 if (offset) *offset = -1;
1364 return false;
1365 }
1366
1367 // Loads .dll/.so and
1368 // in case of error it checks if .dll/.so was built for the
1369 // same architecture as Hotspot is running on
1370
1371 #ifdef __APPLE__
1372 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1373 #ifdef STATIC_BUILD
1374 return os::get_default_process_handle();
1375 #else
1376 void * result= ::dlopen(filename, RTLD_LAZY);
1377 if (result != NULL) {
1378 // Successful loading
1379 return result;
1380 }
1381
1382 // Read system error message into ebuf
1383 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1384 ebuf[ebuflen-1]='\0';
1385
1386 return NULL;
1387 #endif // STATIC_BUILD
1388 }
1389 #else
1390 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1391 #ifdef STATIC_BUILD
1392 return os::get_default_process_handle();
1393 #else
1394 void * result= ::dlopen(filename, RTLD_LAZY);
1395 if (result != NULL) {
1396 // Successful loading
1397 return result;
1398 }
1399
1400 Elf32_Ehdr elf_head;
1401
1402 // Read system error message into ebuf
1403 // It may or may not be overwritten below
1404 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1405 ebuf[ebuflen-1]='\0';
1406 int diag_msg_max_length=ebuflen-strlen(ebuf);
1407 char* diag_msg_buf=ebuf+strlen(ebuf);
1408
1409 if (diag_msg_max_length==0) {
1410 // No more space in ebuf for additional diagnostics message
1411 return NULL;
1412 }
1413
1414
1415 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1416
1417 if (file_descriptor < 0) {
1418 // Can't open library, report dlerror() message
1419 return NULL;
1420 }
1421
1422 bool failed_to_read_elf_head=
1423 (sizeof(elf_head)!=
1424 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1425
1426 ::close(file_descriptor);
1427 if (failed_to_read_elf_head) {
1428 // file i/o error - report dlerror() msg
1429 return NULL;
1430 }
1431
1432 typedef struct {
1433 Elf32_Half code; // Actual value as defined in elf.h
1434 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1435 char elf_class; // 32 or 64 bit
1436 char endianess; // MSB or LSB
1437 char* name; // String representation
1438 } arch_t;
1439
1440 #ifndef EM_486
1441 #define EM_486 6 /* Intel 80486 */
1442 #endif
1443
1444 #ifndef EM_MIPS_RS3_LE
1445 #define EM_MIPS_RS3_LE 10 /* MIPS */
1446 #endif
1447
1448 #ifndef EM_PPC64
1449 #define EM_PPC64 21 /* PowerPC64 */
1450 #endif
1451
1452 #ifndef EM_S390
1453 #define EM_S390 22 /* IBM System/390 */
1454 #endif
1455
1456 #ifndef EM_IA_64
1457 #define EM_IA_64 50 /* HP/Intel IA-64 */
1458 #endif
1459
1460 #ifndef EM_X86_64
1461 #define EM_X86_64 62 /* AMD x86-64 */
1462 #endif
1463
1464 static const arch_t arch_array[]={
1465 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1466 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1467 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1468 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1469 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1470 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1471 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1472 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1473 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1474 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1475 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1476 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1477 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1478 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1479 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1480 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1481 };
1482
1483 #if (defined IA32)
1484 static Elf32_Half running_arch_code=EM_386;
1485 #elif (defined AMD64)
1486 static Elf32_Half running_arch_code=EM_X86_64;
1487 #elif (defined IA64)
1488 static Elf32_Half running_arch_code=EM_IA_64;
1489 #elif (defined __sparc) && (defined _LP64)
1490 static Elf32_Half running_arch_code=EM_SPARCV9;
1491 #elif (defined __sparc) && (!defined _LP64)
1492 static Elf32_Half running_arch_code=EM_SPARC;
1493 #elif (defined __powerpc64__)
1494 static Elf32_Half running_arch_code=EM_PPC64;
1495 #elif (defined __powerpc__)
1496 static Elf32_Half running_arch_code=EM_PPC;
1497 #elif (defined ARM)
1498 static Elf32_Half running_arch_code=EM_ARM;
1499 #elif (defined S390)
1500 static Elf32_Half running_arch_code=EM_S390;
1501 #elif (defined ALPHA)
1502 static Elf32_Half running_arch_code=EM_ALPHA;
1503 #elif (defined MIPSEL)
1504 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1505 #elif (defined PARISC)
1506 static Elf32_Half running_arch_code=EM_PARISC;
1507 #elif (defined MIPS)
1508 static Elf32_Half running_arch_code=EM_MIPS;
1509 #elif (defined M68K)
1510 static Elf32_Half running_arch_code=EM_68K;
1511 #else
1512 #error Method os::dll_load requires that one of following is defined:\
1513 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1514 #endif
1515
1516 // Identify compatability class for VM's architecture and library's architecture
1517 // Obtain string descriptions for architectures
1518
1519 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1520 int running_arch_index=-1;
1521
1522 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1523 if (running_arch_code == arch_array[i].code) {
1524 running_arch_index = i;
1525 }
1526 if (lib_arch.code == arch_array[i].code) {
1527 lib_arch.compat_class = arch_array[i].compat_class;
1528 lib_arch.name = arch_array[i].name;
1529 }
1530 }
1531
1532 assert(running_arch_index != -1,
1533 "Didn't find running architecture code (running_arch_code) in arch_array");
1534 if (running_arch_index == -1) {
1535 // Even though running architecture detection failed
1536 // we may still continue with reporting dlerror() message
1537 return NULL;
1538 }
1539
1540 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1541 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1542 return NULL;
1543 }
1544
1545 #ifndef S390
1546 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1547 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1548 return NULL;
1549 }
1550 #endif // !S390
1551
1552 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1553 if (lib_arch.name!=NULL) {
1554 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1555 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1556 lib_arch.name, arch_array[running_arch_index].name);
1557 } else {
1558 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1559 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1560 lib_arch.code,
1561 arch_array[running_arch_index].name);
1562 }
1563 }
1564
1565 return NULL;
1566 #endif // STATIC_BUILD
1567 }
1568 #endif // !__APPLE__
1569
1570 void* os::get_default_process_handle() {
1571 #ifdef __APPLE__
1572 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1573 // to avoid finding unexpected symbols on second (or later)
1574 // loads of a library.
1575 return (void*)::dlopen(NULL, RTLD_FIRST);
1576 #else
1577 return (void*)::dlopen(NULL, RTLD_LAZY);
1578 #endif
1579 }
1580
1581 // XXX: Do we need a lock around this as per Linux?
1582 void* os::dll_lookup(void* handle, const char* name) {
1583 return dlsym(handle, name);
1584 }
1585
1586 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1587 outputStream * out = (outputStream *) param;
1588 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1589 return 0;
1590 }
1591
1592 void os::print_dll_info(outputStream *st) {
1593 st->print_cr("Dynamic libraries:");
1594 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1595 st->print_cr("Error: Cannot print dynamic libraries.");
1596 }
1597 }
1598
1599 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1600 #ifdef RTLD_DI_LINKMAP
1601 Dl_info dli;
1602 void *handle;
1603 Link_map *map;
1604 Link_map *p;
1605
1606 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1607 dli.dli_fname == NULL) {
1608 return 1;
1609 }
1610 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1611 if (handle == NULL) {
1612 return 1;
1613 }
1614 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1615 if (map == NULL) {
1616 dlclose(handle);
1617 return 1;
1618 }
1619
1620 while (map->l_prev != NULL)
1621 map = map->l_prev;
1622
1623 while (map != NULL) {
1624 // Value for top_address is returned as 0 since we don't have any information about module size
1625 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1626 dlclose(handle);
1627 return 1;
1628 }
1629 map = map->l_next;
1630 }
1631
1632 dlclose(handle);
1633 #elif defined(__APPLE__)
1634 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1635 // Value for top_address is returned as 0 since we don't have any information about module size
1636 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1637 return 1;
1638 }
1639 }
1640 return 0;
1641 #else
1642 return 1;
1643 #endif
1644 }
1645
1646 void os::get_summary_os_info(char* buf, size_t buflen) {
1647 // These buffers are small because we want this to be brief
1648 // and not use a lot of stack while generating the hs_err file.
1649 char os[100];
1650 size_t size = sizeof(os);
1651 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1652 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1653 #ifdef __APPLE__
1654 strncpy(os, "Darwin", sizeof(os));
1655 #elif __OpenBSD__
1656 strncpy(os, "OpenBSD", sizeof(os));
1657 #else
1658 strncpy(os, "BSD", sizeof(os));
1659 #endif
1660 }
1661
1662 char release[100];
1663 size = sizeof(release);
1664 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1665 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1666 // if error, leave blank
1667 strncpy(release, "", sizeof(release));
1668 }
1669 snprintf(buf, buflen, "%s %s", os, release);
1670 }
1671
1672 void os::print_os_info_brief(outputStream* st) {
1673 os::Posix::print_uname_info(st);
1674 }
1675
1676 void os::print_os_info(outputStream* st) {
1677 st->print("OS:");
1678
1679 os::Posix::print_uname_info(st);
1680
1681 os::Posix::print_rlimit_info(st);
1682
1683 os::Posix::print_load_average(st);
1684 }
1685
1686 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1687 // Nothing to do for now.
1688 }
1689
1690 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1691 unsigned int mhz;
1692 size_t size = sizeof(mhz);
1693 int mib[] = { CTL_HW, HW_CPU_FREQ };
1694 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1695 mhz = 1; // looks like an error but can be divided by
1696 } else {
1697 mhz /= 1000000; // reported in millions
1698 }
1699
1700 char model[100];
1701 size = sizeof(model);
1702 int mib_model[] = { CTL_HW, HW_MODEL };
1703 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1704 strncpy(model, cpu_arch, sizeof(model));
1705 }
1706
1707 char machine[100];
1708 size = sizeof(machine);
1709 int mib_machine[] = { CTL_HW, HW_MACHINE };
1710 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1711 strncpy(machine, "", sizeof(machine));
1712 }
1713
1714 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1715 }
1716
1717 void os::print_memory_info(outputStream* st) {
1718
1719 st->print("Memory:");
1720 st->print(" %dk page", os::vm_page_size()>>10);
1721
1722 st->print(", physical " UINT64_FORMAT "k",
1723 os::physical_memory() >> 10);
1724 st->print("(" UINT64_FORMAT "k free)",
1725 os::available_memory() >> 10);
1726 st->cr();
1727 }
1728
1729 static void print_signal_handler(outputStream* st, int sig,
1730 char* buf, size_t buflen);
1731
1732 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1733 st->print_cr("Signal Handlers:");
1734 print_signal_handler(st, SIGSEGV, buf, buflen);
1735 print_signal_handler(st, SIGBUS , buf, buflen);
1736 print_signal_handler(st, SIGFPE , buf, buflen);
1737 print_signal_handler(st, SIGPIPE, buf, buflen);
1738 print_signal_handler(st, SIGXFSZ, buf, buflen);
1739 print_signal_handler(st, SIGILL , buf, buflen);
1740 print_signal_handler(st, SR_signum, buf, buflen);
1741 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1742 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1743 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1744 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1745 }
1746
1747 static char saved_jvm_path[MAXPATHLEN] = {0};
1748
1749 // Find the full path to the current module, libjvm
1750 void os::jvm_path(char *buf, jint buflen) {
1751 // Error checking.
1752 if (buflen < MAXPATHLEN) {
1753 assert(false, "must use a large-enough buffer");
1754 buf[0] = '\0';
1755 return;
1756 }
1757 // Lazy resolve the path to current module.
1758 if (saved_jvm_path[0] != 0) {
1759 strcpy(buf, saved_jvm_path);
1760 return;
1761 }
1762
1763 char dli_fname[MAXPATHLEN];
1764 bool ret = dll_address_to_library_name(
1765 CAST_FROM_FN_PTR(address, os::jvm_path),
1766 dli_fname, sizeof(dli_fname), NULL);
1767 assert(ret, "cannot locate libjvm");
1768 char *rp = NULL;
1769 if (ret && dli_fname[0] != '\0') {
1770 rp = realpath(dli_fname, buf);
1771 }
1772 if (rp == NULL) {
1773 return;
1774 }
1775
1776 if (Arguments::sun_java_launcher_is_altjvm()) {
1777 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1778 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1779 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1780 // appears at the right place in the string, then assume we are
1781 // installed in a JDK and we're done. Otherwise, check for a
1782 // JAVA_HOME environment variable and construct a path to the JVM
1783 // being overridden.
1784
1785 const char *p = buf + strlen(buf) - 1;
1786 for (int count = 0; p > buf && count < 5; ++count) {
1787 for (--p; p > buf && *p != '/'; --p)
1788 /* empty */ ;
1789 }
1790
1791 if (strncmp(p, "/jre/lib/", 9) != 0) {
1792 // Look for JAVA_HOME in the environment.
1793 char* java_home_var = ::getenv("JAVA_HOME");
1794 if (java_home_var != NULL && java_home_var[0] != 0) {
1795 char* jrelib_p;
1796 int len;
1797
1798 // Check the current module name "libjvm"
1799 p = strrchr(buf, '/');
1800 assert(strstr(p, "/libjvm") == p, "invalid library name");
1801
1802 rp = realpath(java_home_var, buf);
1803 if (rp == NULL) {
1804 return;
1805 }
1806
1807 // determine if this is a legacy image or modules image
1808 // modules image doesn't have "jre" subdirectory
1809 len = strlen(buf);
1810 assert(len < buflen, "Ran out of buffer space");
1811 jrelib_p = buf + len;
1812
1813 // Add the appropriate library subdir
1814 snprintf(jrelib_p, buflen-len, "/jre/lib");
1815 if (0 != access(buf, F_OK)) {
1816 snprintf(jrelib_p, buflen-len, "/lib");
1817 }
1818
1819 // Add the appropriate client or server subdir
1820 len = strlen(buf);
1821 jrelib_p = buf + len;
1822 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1823 if (0 != access(buf, F_OK)) {
1824 snprintf(jrelib_p, buflen-len, "%s", "");
1825 }
1826
1827 // If the path exists within JAVA_HOME, add the JVM library name
1828 // to complete the path to JVM being overridden. Otherwise fallback
1829 // to the path to the current library.
1830 if (0 == access(buf, F_OK)) {
1831 // Use current module name "libjvm"
1832 len = strlen(buf);
1833 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1834 } else {
1835 // Fall back to path of current library
1836 rp = realpath(dli_fname, buf);
1837 if (rp == NULL) {
1838 return;
1839 }
1840 }
1841 }
1842 }
1843 }
1844
1845 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1846 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1847 }
1848
1849 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1850 // no prefix required, not even "_"
1851 }
1852
1853 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1854 // no suffix required
1855 }
1856
1857 ////////////////////////////////////////////////////////////////////////////////
1858 // sun.misc.Signal support
1859
1860 static volatile jint sigint_count = 0;
1861
1862 static void UserHandler(int sig, void *siginfo, void *context) {
1863 // 4511530 - sem_post is serialized and handled by the manager thread. When
1864 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1865 // don't want to flood the manager thread with sem_post requests.
1866 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1867 return;
1868 }
1869
1870 // Ctrl-C is pressed during error reporting, likely because the error
1871 // handler fails to abort. Let VM die immediately.
1872 if (sig == SIGINT && is_error_reported()) {
1873 os::die();
1874 }
1875
1876 os::signal_notify(sig);
1877 }
1878
1879 void* os::user_handler() {
1880 return CAST_FROM_FN_PTR(void*, UserHandler);
1881 }
1882
1883 extern "C" {
1884 typedef void (*sa_handler_t)(int);
1885 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1886 }
1887
1888 void* os::signal(int signal_number, void* handler) {
1889 struct sigaction sigAct, oldSigAct;
1890
1891 sigfillset(&(sigAct.sa_mask));
1892 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1893 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1894
1895 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1896 // -1 means registration failed
1897 return (void *)-1;
1898 }
1899
1900 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1901 }
1902
1903 void os::signal_raise(int signal_number) {
1904 ::raise(signal_number);
1905 }
1906
1907 // The following code is moved from os.cpp for making this
1908 // code platform specific, which it is by its very nature.
1909
1910 // Will be modified when max signal is changed to be dynamic
1911 int os::sigexitnum_pd() {
1912 return NSIG;
1913 }
1914
1915 // a counter for each possible signal value
1916 static volatile jint pending_signals[NSIG+1] = { 0 };
1917
1918 // Bsd(POSIX) specific hand shaking semaphore.
1919 #ifdef __APPLE__
1920 typedef semaphore_t os_semaphore_t;
1921
1922 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1923 #define SEM_WAIT(sem) semaphore_wait(sem)
1924 #define SEM_POST(sem) semaphore_signal(sem)
1925 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1926 #else
1927 typedef sem_t os_semaphore_t;
1928
1929 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1930 #define SEM_WAIT(sem) sem_wait(&sem)
1931 #define SEM_POST(sem) sem_post(&sem)
1932 #define SEM_DESTROY(sem) sem_destroy(&sem)
1933 #endif
1934
1935 #ifdef __APPLE__
1936 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
1937
1938 static const char* sem_init_strerror(kern_return_t value) {
1939 switch (value) {
1940 case KERN_INVALID_ARGUMENT: return "Invalid argument";
1941 case KERN_RESOURCE_SHORTAGE: return "Resource shortage";
1942 default: return "Unknown";
1943 }
1944 }
1945
1946 OSXSemaphore::OSXSemaphore(uint value) {
1947 kern_return_t ret = SEM_INIT(_semaphore, value);
1948
1949 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret));
1950 }
1951
1952 OSXSemaphore::~OSXSemaphore() {
1953 SEM_DESTROY(_semaphore);
1954 }
1955
1956 void OSXSemaphore::signal(uint count) {
1957 for (uint i = 0; i < count; i++) {
1958 kern_return_t ret = SEM_POST(_semaphore);
1959
1960 assert(ret == KERN_SUCCESS, "Failed to signal semaphore");
1961 }
1962 }
1963
1964 void OSXSemaphore::wait() {
1965 kern_return_t ret;
1966 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) {
1967 // Semaphore was interrupted. Retry.
1968 }
1969 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore");
1970 }
1971
1972 jlong OSXSemaphore::currenttime() {
1973 struct timeval tv;
1974 gettimeofday(&tv, NULL);
1975 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1976 }
1977
1978 bool OSXSemaphore::trywait() {
1979 return timedwait(0, 0);
1980 }
1981
1982 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) {
1983 kern_return_t kr = KERN_ABORTED;
1984 mach_timespec_t waitspec;
1985 waitspec.tv_sec = sec;
1986 waitspec.tv_nsec = nsec;
1987
1988 jlong starttime = currenttime();
1989
1990 kr = semaphore_timedwait(_semaphore, waitspec);
1991 while (kr == KERN_ABORTED) {
1992 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1993
1994 jlong current = currenttime();
1995 jlong passedtime = current - starttime;
1996
1997 if (passedtime >= totalwait) {
1998 waitspec.tv_sec = 0;
1999 waitspec.tv_nsec = 0;
2000 } else {
2001 jlong waittime = totalwait - (current - starttime);
2002 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
2003 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
2004 }
2005
2006 kr = semaphore_timedwait(_semaphore, waitspec);
2007 }
2008
2009 return kr == KERN_SUCCESS;
2010 }
2011
2012 #else
2013 // Use POSIX implementation of semaphores.
2014
2015 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2016 struct timespec ts;
2017 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2018
2019 return ts;
2020 }
2021
2022 #endif // __APPLE__
2023
2024 static os_semaphore_t sig_sem;
2025
2026 #ifdef __APPLE__
2027 static OSXSemaphore sr_semaphore;
2028 #else
2029 static PosixSemaphore sr_semaphore;
2030 #endif
2031
2032 void os::signal_init_pd() {
2033 // Initialize signal structures
2034 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2035
2036 // Initialize signal semaphore
2037 ::SEM_INIT(sig_sem, 0);
2038 }
2039
2040 void os::signal_notify(int sig) {
2041 Atomic::inc(&pending_signals[sig]);
2042 ::SEM_POST(sig_sem);
2043 }
2044
2045 static int check_pending_signals(bool wait) {
2046 Atomic::store(0, &sigint_count);
2047 for (;;) {
2048 for (int i = 0; i < NSIG + 1; i++) {
2049 jint n = pending_signals[i];
2050 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2051 return i;
2052 }
2053 }
2054 if (!wait) {
2055 return -1;
2056 }
2057 JavaThread *thread = JavaThread::current();
2058 ThreadBlockInVM tbivm(thread);
2059
2060 bool threadIsSuspended;
2061 do {
2062 thread->set_suspend_equivalent();
2063 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2064 ::SEM_WAIT(sig_sem);
2065
2066 // were we externally suspended while we were waiting?
2067 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2068 if (threadIsSuspended) {
2069 // The semaphore has been incremented, but while we were waiting
2070 // another thread suspended us. We don't want to continue running
2071 // while suspended because that would surprise the thread that
2072 // suspended us.
2073 ::SEM_POST(sig_sem);
2074
2075 thread->java_suspend_self();
2076 }
2077 } while (threadIsSuspended);
2078 }
2079 }
2080
2081 int os::signal_lookup() {
2082 return check_pending_signals(false);
2083 }
2084
2085 int os::signal_wait() {
2086 return check_pending_signals(true);
2087 }
2088
2089 ////////////////////////////////////////////////////////////////////////////////
2090 // Virtual Memory
2091
2092 int os::vm_page_size() {
2093 // Seems redundant as all get out
2094 assert(os::Bsd::page_size() != -1, "must call os::init");
2095 return os::Bsd::page_size();
2096 }
2097
2098 // Solaris allocates memory by pages.
2099 int os::vm_allocation_granularity() {
2100 assert(os::Bsd::page_size() != -1, "must call os::init");
2101 return os::Bsd::page_size();
2102 }
2103
2104 // Rationale behind this function:
2105 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2106 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2107 // samples for JITted code. Here we create private executable mapping over the code cache
2108 // and then we can use standard (well, almost, as mapping can change) way to provide
2109 // info for the reporting script by storing timestamp and location of symbol
2110 void bsd_wrap_code(char* base, size_t size) {
2111 static volatile jint cnt = 0;
2112
2113 if (!UseOprofile) {
2114 return;
2115 }
2116
2117 char buf[PATH_MAX + 1];
2118 int num = Atomic::add(1, &cnt);
2119
2120 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2121 os::get_temp_directory(), os::current_process_id(), num);
2122 unlink(buf);
2123
2124 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2125
2126 if (fd != -1) {
2127 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2128 if (rv != (off_t)-1) {
2129 if (::write(fd, "", 1) == 1) {
2130 mmap(base, size,
2131 PROT_READ|PROT_WRITE|PROT_EXEC,
2132 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2133 }
2134 }
2135 ::close(fd);
2136 unlink(buf);
2137 }
2138 }
2139
2140 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2141 int err) {
2142 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2143 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2144 os::errno_name(err), err);
2145 }
2146
2147 // NOTE: Bsd kernel does not really reserve the pages for us.
2148 // All it does is to check if there are enough free pages
2149 // left at the time of mmap(). This could be a potential
2150 // problem.
2151 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2152 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2153 #ifdef __OpenBSD__
2154 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2155 if (::mprotect(addr, size, prot) == 0) {
2156 return true;
2157 }
2158 #else
2159 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2160 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2161 if (res != (uintptr_t) MAP_FAILED) {
2162 return true;
2163 }
2164 #endif
2165
2166 // Warn about any commit errors we see in non-product builds just
2167 // in case mmap() doesn't work as described on the man page.
2168 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2169
2170 return false;
2171 }
2172
2173 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2174 bool exec) {
2175 // alignment_hint is ignored on this OS
2176 return pd_commit_memory(addr, size, exec);
2177 }
2178
2179 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2180 const char* mesg) {
2181 assert(mesg != NULL, "mesg must be specified");
2182 if (!pd_commit_memory(addr, size, exec)) {
2183 // add extra info in product mode for vm_exit_out_of_memory():
2184 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2185 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2186 }
2187 }
2188
2189 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2190 size_t alignment_hint, bool exec,
2191 const char* mesg) {
2192 // alignment_hint is ignored on this OS
2193 pd_commit_memory_or_exit(addr, size, exec, mesg);
2194 }
2195
2196 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2197 }
2198
2199 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2200 ::madvise(addr, bytes, MADV_DONTNEED);
2201 }
2202
2203 void os::numa_make_global(char *addr, size_t bytes) {
2204 }
2205
2206 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2207 }
2208
2209 bool os::numa_topology_changed() { return false; }
2210
2211 size_t os::numa_get_groups_num() {
2212 return 1;
2213 }
2214
2215 int os::numa_get_group_id() {
2216 return 0;
2217 }
2218
2219 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2220 if (size > 0) {
2221 ids[0] = 0;
2222 return 1;
2223 }
2224 return 0;
2225 }
2226
2227 bool os::get_page_info(char *start, page_info* info) {
2228 return false;
2229 }
2230
2231 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2232 return end;
2233 }
2234
2235
2236 bool os::pd_uncommit_memory(char* addr, size_t size) {
2237 #ifdef __OpenBSD__
2238 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2239 return ::mprotect(addr, size, PROT_NONE) == 0;
2240 #else
2241 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2242 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2243 return res != (uintptr_t) MAP_FAILED;
2244 #endif
2245 }
2246
2247 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2248 return os::commit_memory(addr, size, !ExecMem);
2249 }
2250
2251 // If this is a growable mapping, remove the guard pages entirely by
2252 // munmap()ping them. If not, just call uncommit_memory().
2253 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2254 return os::uncommit_memory(addr, size);
2255 }
2256
2257 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2258 // at 'requested_addr'. If there are existing memory mappings at the same
2259 // location, however, they will be overwritten. If 'fixed' is false,
2260 // 'requested_addr' is only treated as a hint, the return value may or
2261 // may not start from the requested address. Unlike Bsd mmap(), this
2262 // function returns NULL to indicate failure.
2263 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2264 char * addr;
2265 int flags;
2266
2267 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2268 if (fixed) {
2269 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2270 flags |= MAP_FIXED;
2271 }
2272
2273 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2274 // touch an uncommitted page. Otherwise, the read/write might
2275 // succeed if we have enough swap space to back the physical page.
2276 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2277 flags, -1, 0);
2278
2279 return addr == MAP_FAILED ? NULL : addr;
2280 }
2281
2282 static int anon_munmap(char * addr, size_t size) {
2283 return ::munmap(addr, size) == 0;
2284 }
2285
2286 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2287 size_t alignment_hint) {
2288 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2289 }
2290
2291 bool os::pd_release_memory(char* addr, size_t size) {
2292 return anon_munmap(addr, size);
2293 }
2294
2295 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2296 // Bsd wants the mprotect address argument to be page aligned.
2297 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
2298
2299 // According to SUSv3, mprotect() should only be used with mappings
2300 // established by mmap(), and mmap() always maps whole pages. Unaligned
2301 // 'addr' likely indicates problem in the VM (e.g. trying to change
2302 // protection of malloc'ed or statically allocated memory). Check the
2303 // caller if you hit this assert.
2304 assert(addr == bottom, "sanity check");
2305
2306 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2307 return ::mprotect(bottom, size, prot) == 0;
2308 }
2309
2310 // Set protections specified
2311 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2312 bool is_committed) {
2313 unsigned int p = 0;
2314 switch (prot) {
2315 case MEM_PROT_NONE: p = PROT_NONE; break;
2316 case MEM_PROT_READ: p = PROT_READ; break;
2317 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2318 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2319 default:
2320 ShouldNotReachHere();
2321 }
2322 // is_committed is unused.
2323 return bsd_mprotect(addr, bytes, p);
2324 }
2325
2326 bool os::guard_memory(char* addr, size_t size) {
2327 return bsd_mprotect(addr, size, PROT_NONE);
2328 }
2329
2330 bool os::unguard_memory(char* addr, size_t size) {
2331 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2332 }
2333
2334 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2335 return false;
2336 }
2337
2338 // Large page support
2339
2340 static size_t _large_page_size = 0;
2341
2342 void os::large_page_init() {
2343 }
2344
2345
2346 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2347 fatal("This code is not used or maintained.");
2348
2349 // "exec" is passed in but not used. Creating the shared image for
2350 // the code cache doesn't have an SHM_X executable permission to check.
2351 assert(UseLargePages && UseSHM, "only for SHM large pages");
2352
2353 key_t key = IPC_PRIVATE;
2354 char *addr;
2355
2356 bool warn_on_failure = UseLargePages &&
2357 (!FLAG_IS_DEFAULT(UseLargePages) ||
2358 !FLAG_IS_DEFAULT(LargePageSizeInBytes));
2359
2360 // Create a large shared memory region to attach to based on size.
2361 // Currently, size is the total size of the heap
2362 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2363 if (shmid == -1) {
2364 // Possible reasons for shmget failure:
2365 // 1. shmmax is too small for Java heap.
2366 // > check shmmax value: cat /proc/sys/kernel/shmmax
2367 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2368 // 2. not enough large page memory.
2369 // > check available large pages: cat /proc/meminfo
2370 // > increase amount of large pages:
2371 // echo new_value > /proc/sys/vm/nr_hugepages
2372 // Note 1: different Bsd may use different name for this property,
2373 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2374 // Note 2: it's possible there's enough physical memory available but
2375 // they are so fragmented after a long run that they can't
2376 // coalesce into large pages. Try to reserve large pages when
2377 // the system is still "fresh".
2378 if (warn_on_failure) {
2379 warning("Failed to reserve shared memory (errno = %d).", errno);
2380 }
2381 return NULL;
2382 }
2383
2384 // attach to the region
2385 addr = (char*)shmat(shmid, req_addr, 0);
2386 int err = errno;
2387
2388 // Remove shmid. If shmat() is successful, the actual shared memory segment
2389 // will be deleted when it's detached by shmdt() or when the process
2390 // terminates. If shmat() is not successful this will remove the shared
2391 // segment immediately.
2392 shmctl(shmid, IPC_RMID, NULL);
2393
2394 if ((intptr_t)addr == -1) {
2395 if (warn_on_failure) {
2396 warning("Failed to attach shared memory (errno = %d).", err);
2397 }
2398 return NULL;
2399 }
2400
2401 // The memory is committed
2402 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
2403
2404 return addr;
2405 }
2406
2407 bool os::release_memory_special(char* base, size_t bytes) {
2408 if (MemTracker::tracking_level() > NMT_minimal) {
2409 Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
2410 // detaching the SHM segment will also delete it, see reserve_memory_special()
2411 int rslt = shmdt(base);
2412 if (rslt == 0) {
2413 tkr.record((address)base, bytes);
2414 return true;
2415 } else {
2416 return false;
2417 }
2418 } else {
2419 return shmdt(base) == 0;
2420 }
2421 }
2422
2423 size_t os::large_page_size() {
2424 return _large_page_size;
2425 }
2426
2427 // HugeTLBFS allows application to commit large page memory on demand;
2428 // with SysV SHM the entire memory region must be allocated as shared
2429 // memory.
2430 bool os::can_commit_large_page_memory() {
2431 return UseHugeTLBFS;
2432 }
2433
2434 bool os::can_execute_large_page_memory() {
2435 return UseHugeTLBFS;
2436 }
2437
2438 // Reserve memory at an arbitrary address, only if that area is
2439 // available (and not reserved for something else).
2440
2441 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2442 const int max_tries = 10;
2443 char* base[max_tries];
2444 size_t size[max_tries];
2445 const size_t gap = 0x000000;
2446
2447 // Assert only that the size is a multiple of the page size, since
2448 // that's all that mmap requires, and since that's all we really know
2449 // about at this low abstraction level. If we need higher alignment,
2450 // we can either pass an alignment to this method or verify alignment
2451 // in one of the methods further up the call chain. See bug 5044738.
2452 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2453
2454 // Repeatedly allocate blocks until the block is allocated at the
2455 // right spot.
2456
2457 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2458 // if kernel honors the hint then we can return immediately.
2459 char * addr = anon_mmap(requested_addr, bytes, false);
2460 if (addr == requested_addr) {
2461 return requested_addr;
2462 }
2463
2464 if (addr != NULL) {
2465 // mmap() is successful but it fails to reserve at the requested address
2466 anon_munmap(addr, bytes);
2467 }
2468
2469 int i;
2470 for (i = 0; i < max_tries; ++i) {
2471 base[i] = reserve_memory(bytes);
2472
2473 if (base[i] != NULL) {
2474 // Is this the block we wanted?
2475 if (base[i] == requested_addr) {
2476 size[i] = bytes;
2477 break;
2478 }
2479
2480 // Does this overlap the block we wanted? Give back the overlapped
2481 // parts and try again.
2482
2483 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2484 if (top_overlap >= 0 && top_overlap < bytes) {
2485 unmap_memory(base[i], top_overlap);
2486 base[i] += top_overlap;
2487 size[i] = bytes - top_overlap;
2488 } else {
2489 size_t bottom_overlap = base[i] + bytes - requested_addr;
2490 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2491 unmap_memory(requested_addr, bottom_overlap);
2492 size[i] = bytes - bottom_overlap;
2493 } else {
2494 size[i] = bytes;
2495 }
2496 }
2497 }
2498 }
2499
2500 // Give back the unused reserved pieces.
2501
2502 for (int j = 0; j < i; ++j) {
2503 if (base[j] != NULL) {
2504 unmap_memory(base[j], size[j]);
2505 }
2506 }
2507
2508 if (i < max_tries) {
2509 return requested_addr;
2510 } else {
2511 return NULL;
2512 }
2513 }
2514
2515 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2516 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2517 }
2518
2519 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2520 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2521 }
2522
2523 void os::naked_short_sleep(jlong ms) {
2524 struct timespec req;
2525
2526 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2527 req.tv_sec = 0;
2528 if (ms > 0) {
2529 req.tv_nsec = (ms % 1000) * 1000000;
2530 } else {
2531 req.tv_nsec = 1;
2532 }
2533
2534 nanosleep(&req, NULL);
2535
2536 return;
2537 }
2538
2539 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2540 void os::infinite_sleep() {
2541 while (true) { // sleep forever ...
2542 ::sleep(100); // ... 100 seconds at a time
2543 }
2544 }
2545
2546 // Used to convert frequent JVM_Yield() to nops
2547 bool os::dont_yield() {
2548 return DontYieldALot;
2549 }
2550
2551 void os::naked_yield() {
2552 sched_yield();
2553 }
2554
2555 ////////////////////////////////////////////////////////////////////////////////
2556 // thread priority support
2557
2558 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2559 // only supports dynamic priority, static priority must be zero. For real-time
2560 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2561 // However, for large multi-threaded applications, SCHED_RR is not only slower
2562 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2563 // of 5 runs - Sep 2005).
2564 //
2565 // The following code actually changes the niceness of kernel-thread/LWP. It
2566 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2567 // not the entire user process, and user level threads are 1:1 mapped to kernel
2568 // threads. It has always been the case, but could change in the future. For
2569 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2570 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2571
2572 #if !defined(__APPLE__)
2573 int os::java_to_os_priority[CriticalPriority + 1] = {
2574 19, // 0 Entry should never be used
2575
2576 0, // 1 MinPriority
2577 3, // 2
2578 6, // 3
2579
2580 10, // 4
2581 15, // 5 NormPriority
2582 18, // 6
2583
2584 21, // 7
2585 25, // 8
2586 28, // 9 NearMaxPriority
2587
2588 31, // 10 MaxPriority
2589
2590 31 // 11 CriticalPriority
2591 };
2592 #else
2593 // Using Mach high-level priority assignments
2594 int os::java_to_os_priority[CriticalPriority + 1] = {
2595 0, // 0 Entry should never be used (MINPRI_USER)
2596
2597 27, // 1 MinPriority
2598 28, // 2
2599 29, // 3
2600
2601 30, // 4
2602 31, // 5 NormPriority (BASEPRI_DEFAULT)
2603 32, // 6
2604
2605 33, // 7
2606 34, // 8
2607 35, // 9 NearMaxPriority
2608
2609 36, // 10 MaxPriority
2610
2611 36 // 11 CriticalPriority
2612 };
2613 #endif
2614
2615 static int prio_init() {
2616 if (ThreadPriorityPolicy == 1) {
2617 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2618 // if effective uid is not root. Perhaps, a more elegant way of doing
2619 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2620 if (geteuid() != 0) {
2621 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2622 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2623 }
2624 ThreadPriorityPolicy = 0;
2625 }
2626 }
2627 if (UseCriticalJavaThreadPriority) {
2628 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2629 }
2630 return 0;
2631 }
2632
2633 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2634 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2635
2636 #ifdef __OpenBSD__
2637 // OpenBSD pthread_setprio starves low priority threads
2638 return OS_OK;
2639 #elif defined(__FreeBSD__)
2640 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2641 #elif defined(__APPLE__) || defined(__NetBSD__)
2642 struct sched_param sp;
2643 int policy;
2644 pthread_t self = pthread_self();
2645
2646 if (pthread_getschedparam(self, &policy, &sp) != 0) {
2647 return OS_ERR;
2648 }
2649
2650 sp.sched_priority = newpri;
2651 if (pthread_setschedparam(self, policy, &sp) != 0) {
2652 return OS_ERR;
2653 }
2654
2655 return OS_OK;
2656 #else
2657 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2658 return (ret == 0) ? OS_OK : OS_ERR;
2659 #endif
2660 }
2661
2662 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2663 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2664 *priority_ptr = java_to_os_priority[NormPriority];
2665 return OS_OK;
2666 }
2667
2668 errno = 0;
2669 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2670 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2671 #elif defined(__APPLE__) || defined(__NetBSD__)
2672 int policy;
2673 struct sched_param sp;
2674
2675 pthread_getschedparam(pthread_self(), &policy, &sp);
2676 *priority_ptr = sp.sched_priority;
2677 #else
2678 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2679 #endif
2680 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2681 }
2682
2683 // Hint to the underlying OS that a task switch would not be good.
2684 // Void return because it's a hint and can fail.
2685 void os::hint_no_preempt() {}
2686
2687 ////////////////////////////////////////////////////////////////////////////////
2688 // suspend/resume support
2689
2690 // the low-level signal-based suspend/resume support is a remnant from the
2691 // old VM-suspension that used to be for java-suspension, safepoints etc,
2692 // within hotspot. Now there is a single use-case for this:
2693 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2694 // that runs in the watcher thread.
2695 // The remaining code is greatly simplified from the more general suspension
2696 // code that used to be used.
2697 //
2698 // The protocol is quite simple:
2699 // - suspend:
2700 // - sends a signal to the target thread
2701 // - polls the suspend state of the osthread using a yield loop
2702 // - target thread signal handler (SR_handler) sets suspend state
2703 // and blocks in sigsuspend until continued
2704 // - resume:
2705 // - sets target osthread state to continue
2706 // - sends signal to end the sigsuspend loop in the SR_handler
2707 //
2708 // Note that the SR_lock plays no role in this suspend/resume protocol.
2709
2710 static void resume_clear_context(OSThread *osthread) {
2711 osthread->set_ucontext(NULL);
2712 osthread->set_siginfo(NULL);
2713 }
2714
2715 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2716 osthread->set_ucontext(context);
2717 osthread->set_siginfo(siginfo);
2718 }
2719
2720 // Handler function invoked when a thread's execution is suspended or
2721 // resumed. We have to be careful that only async-safe functions are
2722 // called here (Note: most pthread functions are not async safe and
2723 // should be avoided.)
2724 //
2725 // Note: sigwait() is a more natural fit than sigsuspend() from an
2726 // interface point of view, but sigwait() prevents the signal hander
2727 // from being run. libpthread would get very confused by not having
2728 // its signal handlers run and prevents sigwait()'s use with the
2729 // mutex granting granting signal.
2730 //
2731 // Currently only ever called on the VMThread or JavaThread
2732 //
2733 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2734 // Save and restore errno to avoid confusing native code with EINTR
2735 // after sigsuspend.
2736 int old_errno = errno;
2737
2738 Thread* thread = Thread::current();
2739 OSThread* osthread = thread->osthread();
2740 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2741
2742 os::SuspendResume::State current = osthread->sr.state();
2743 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2744 suspend_save_context(osthread, siginfo, context);
2745
2746 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2747 os::SuspendResume::State state = osthread->sr.suspended();
2748 if (state == os::SuspendResume::SR_SUSPENDED) {
2749 sigset_t suspend_set; // signals for sigsuspend()
2750
2751 // get current set of blocked signals and unblock resume signal
2752 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2753 sigdelset(&suspend_set, SR_signum);
2754
2755 sr_semaphore.signal();
2756 // wait here until we are resumed
2757 while (1) {
2758 sigsuspend(&suspend_set);
2759
2760 os::SuspendResume::State result = osthread->sr.running();
2761 if (result == os::SuspendResume::SR_RUNNING) {
2762 sr_semaphore.signal();
2763 break;
2764 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2765 ShouldNotReachHere();
2766 }
2767 }
2768
2769 } else if (state == os::SuspendResume::SR_RUNNING) {
2770 // request was cancelled, continue
2771 } else {
2772 ShouldNotReachHere();
2773 }
2774
2775 resume_clear_context(osthread);
2776 } else if (current == os::SuspendResume::SR_RUNNING) {
2777 // request was cancelled, continue
2778 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2779 // ignore
2780 } else {
2781 // ignore
2782 }
2783
2784 errno = old_errno;
2785 }
2786
2787
2788 static int SR_initialize() {
2789 struct sigaction act;
2790 char *s;
2791 // Get signal number to use for suspend/resume
2792 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2793 int sig = ::strtol(s, 0, 10);
2794 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2795 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2796 SR_signum = sig;
2797 } else {
2798 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2799 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2800 }
2801 }
2802
2803 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2804 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2805
2806 sigemptyset(&SR_sigset);
2807 sigaddset(&SR_sigset, SR_signum);
2808
2809 // Set up signal handler for suspend/resume
2810 act.sa_flags = SA_RESTART|SA_SIGINFO;
2811 act.sa_handler = (void (*)(int)) SR_handler;
2812
2813 // SR_signum is blocked by default.
2814 // 4528190 - We also need to block pthread restart signal (32 on all
2815 // supported Bsd platforms). Note that BsdThreads need to block
2816 // this signal for all threads to work properly. So we don't have
2817 // to use hard-coded signal number when setting up the mask.
2818 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2819
2820 if (sigaction(SR_signum, &act, 0) == -1) {
2821 return -1;
2822 }
2823
2824 // Save signal flag
2825 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2826 return 0;
2827 }
2828
2829 static int sr_notify(OSThread* osthread) {
2830 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2831 assert_status(status == 0, status, "pthread_kill");
2832 return status;
2833 }
2834
2835 // "Randomly" selected value for how long we want to spin
2836 // before bailing out on suspending a thread, also how often
2837 // we send a signal to a thread we want to resume
2838 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2839 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2840
2841 // returns true on success and false on error - really an error is fatal
2842 // but this seems the normal response to library errors
2843 static bool do_suspend(OSThread* osthread) {
2844 assert(osthread->sr.is_running(), "thread should be running");
2845 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2846
2847 // mark as suspended and send signal
2848 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2849 // failed to switch, state wasn't running?
2850 ShouldNotReachHere();
2851 return false;
2852 }
2853
2854 if (sr_notify(osthread) != 0) {
2855 ShouldNotReachHere();
2856 }
2857
2858 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2859 while (true) {
2860 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2861 break;
2862 } else {
2863 // timeout
2864 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2865 if (cancelled == os::SuspendResume::SR_RUNNING) {
2866 return false;
2867 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2868 // make sure that we consume the signal on the semaphore as well
2869 sr_semaphore.wait();
2870 break;
2871 } else {
2872 ShouldNotReachHere();
2873 return false;
2874 }
2875 }
2876 }
2877
2878 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2879 return true;
2880 }
2881
2882 static void do_resume(OSThread* osthread) {
2883 assert(osthread->sr.is_suspended(), "thread should be suspended");
2884 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2885
2886 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2887 // failed to switch to WAKEUP_REQUEST
2888 ShouldNotReachHere();
2889 return;
2890 }
2891
2892 while (true) {
2893 if (sr_notify(osthread) == 0) {
2894 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2895 if (osthread->sr.is_running()) {
2896 return;
2897 }
2898 }
2899 } else {
2900 ShouldNotReachHere();
2901 }
2902 }
2903
2904 guarantee(osthread->sr.is_running(), "Must be running!");
2905 }
2906
2907 ///////////////////////////////////////////////////////////////////////////////////
2908 // signal handling (except suspend/resume)
2909
2910 // This routine may be used by user applications as a "hook" to catch signals.
2911 // The user-defined signal handler must pass unrecognized signals to this
2912 // routine, and if it returns true (non-zero), then the signal handler must
2913 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2914 // routine will never retun false (zero), but instead will execute a VM panic
2915 // routine kill the process.
2916 //
2917 // If this routine returns false, it is OK to call it again. This allows
2918 // the user-defined signal handler to perform checks either before or after
2919 // the VM performs its own checks. Naturally, the user code would be making
2920 // a serious error if it tried to handle an exception (such as a null check
2921 // or breakpoint) that the VM was generating for its own correct operation.
2922 //
2923 // This routine may recognize any of the following kinds of signals:
2924 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2925 // It should be consulted by handlers for any of those signals.
2926 //
2927 // The caller of this routine must pass in the three arguments supplied
2928 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2929 // field of the structure passed to sigaction(). This routine assumes that
2930 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2931 //
2932 // Note that the VM will print warnings if it detects conflicting signal
2933 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2934 //
2935 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2936 void* ucontext,
2937 int abort_if_unrecognized);
2938
2939 void signalHandler(int sig, siginfo_t* info, void* uc) {
2940 assert(info != NULL && uc != NULL, "it must be old kernel");
2941 int orig_errno = errno; // Preserve errno value over signal handler.
2942 JVM_handle_bsd_signal(sig, info, uc, true);
2943 errno = orig_errno;
2944 }
2945
2946
2947 // This boolean allows users to forward their own non-matching signals
2948 // to JVM_handle_bsd_signal, harmlessly.
2949 bool os::Bsd::signal_handlers_are_installed = false;
2950
2951 // For signal-chaining
2952 struct sigaction sigact[NSIG];
2953 uint32_t sigs = 0;
2954 #if (32 < NSIG-1)
2955 #error "Not all signals can be encoded in sigs. Adapt its type!"
2956 #endif
2957 bool os::Bsd::libjsig_is_loaded = false;
2958 typedef struct sigaction *(*get_signal_t)(int);
2959 get_signal_t os::Bsd::get_signal_action = NULL;
2960
2961 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2962 struct sigaction *actp = NULL;
2963
2964 if (libjsig_is_loaded) {
2965 // Retrieve the old signal handler from libjsig
2966 actp = (*get_signal_action)(sig);
2967 }
2968 if (actp == NULL) {
2969 // Retrieve the preinstalled signal handler from jvm
2970 actp = get_preinstalled_handler(sig);
2971 }
2972
2973 return actp;
2974 }
2975
2976 static bool call_chained_handler(struct sigaction *actp, int sig,
2977 siginfo_t *siginfo, void *context) {
2978 // Call the old signal handler
2979 if (actp->sa_handler == SIG_DFL) {
2980 // It's more reasonable to let jvm treat it as an unexpected exception
2981 // instead of taking the default action.
2982 return false;
2983 } else if (actp->sa_handler != SIG_IGN) {
2984 if ((actp->sa_flags & SA_NODEFER) == 0) {
2985 // automaticlly block the signal
2986 sigaddset(&(actp->sa_mask), sig);
2987 }
2988
2989 sa_handler_t hand;
2990 sa_sigaction_t sa;
2991 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2992 // retrieve the chained handler
2993 if (siginfo_flag_set) {
2994 sa = actp->sa_sigaction;
2995 } else {
2996 hand = actp->sa_handler;
2997 }
2998
2999 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3000 actp->sa_handler = SIG_DFL;
3001 }
3002
3003 // try to honor the signal mask
3004 sigset_t oset;
3005 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3006
3007 // call into the chained handler
3008 if (siginfo_flag_set) {
3009 (*sa)(sig, siginfo, context);
3010 } else {
3011 (*hand)(sig);
3012 }
3013
3014 // restore the signal mask
3015 pthread_sigmask(SIG_SETMASK, &oset, 0);
3016 }
3017 // Tell jvm's signal handler the signal is taken care of.
3018 return true;
3019 }
3020
3021 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3022 bool chained = false;
3023 // signal-chaining
3024 if (UseSignalChaining) {
3025 struct sigaction *actp = get_chained_signal_action(sig);
3026 if (actp != NULL) {
3027 chained = call_chained_handler(actp, sig, siginfo, context);
3028 }
3029 }
3030 return chained;
3031 }
3032
3033 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
3034 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
3035 return &sigact[sig];
3036 }
3037 return NULL;
3038 }
3039
3040 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3041 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3042 sigact[sig] = oldAct;
3043 sigs |= (uint32_t)1 << (sig-1);
3044 }
3045
3046 // for diagnostic
3047 int sigflags[NSIG];
3048
3049 int os::Bsd::get_our_sigflags(int sig) {
3050 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3051 return sigflags[sig];
3052 }
3053
3054 void os::Bsd::set_our_sigflags(int sig, int flags) {
3055 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3056 if (sig > 0 && sig < NSIG) {
3057 sigflags[sig] = flags;
3058 }
3059 }
3060
3061 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3062 // Check for overwrite.
3063 struct sigaction oldAct;
3064 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3065
3066 void* oldhand = oldAct.sa_sigaction
3067 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3068 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3069 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3070 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3071 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3072 if (AllowUserSignalHandlers || !set_installed) {
3073 // Do not overwrite; user takes responsibility to forward to us.
3074 return;
3075 } else if (UseSignalChaining) {
3076 // save the old handler in jvm
3077 save_preinstalled_handler(sig, oldAct);
3078 // libjsig also interposes the sigaction() call below and saves the
3079 // old sigaction on it own.
3080 } else {
3081 fatal("Encountered unexpected pre-existing sigaction handler "
3082 "%#lx for signal %d.", (long)oldhand, sig);
3083 }
3084 }
3085
3086 struct sigaction sigAct;
3087 sigfillset(&(sigAct.sa_mask));
3088 sigAct.sa_handler = SIG_DFL;
3089 if (!set_installed) {
3090 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3091 } else {
3092 sigAct.sa_sigaction = signalHandler;
3093 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3094 }
3095 #ifdef __APPLE__
3096 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3097 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3098 // if the signal handler declares it will handle it on alternate stack.
3099 // Notice we only declare we will handle it on alt stack, but we are not
3100 // actually going to use real alt stack - this is just a workaround.
3101 // Please see ux_exception.c, method catch_mach_exception_raise for details
3102 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3103 if (sig == SIGSEGV) {
3104 sigAct.sa_flags |= SA_ONSTACK;
3105 }
3106 #endif
3107
3108 // Save flags, which are set by ours
3109 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3110 sigflags[sig] = sigAct.sa_flags;
3111
3112 int ret = sigaction(sig, &sigAct, &oldAct);
3113 assert(ret == 0, "check");
3114
3115 void* oldhand2 = oldAct.sa_sigaction
3116 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3117 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3118 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3119 }
3120
3121 // install signal handlers for signals that HotSpot needs to
3122 // handle in order to support Java-level exception handling.
3123
3124 void os::Bsd::install_signal_handlers() {
3125 if (!signal_handlers_are_installed) {
3126 signal_handlers_are_installed = true;
3127
3128 // signal-chaining
3129 typedef void (*signal_setting_t)();
3130 signal_setting_t begin_signal_setting = NULL;
3131 signal_setting_t end_signal_setting = NULL;
3132 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3133 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3134 if (begin_signal_setting != NULL) {
3135 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3136 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3137 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3138 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3139 libjsig_is_loaded = true;
3140 assert(UseSignalChaining, "should enable signal-chaining");
3141 }
3142 if (libjsig_is_loaded) {
3143 // Tell libjsig jvm is setting signal handlers
3144 (*begin_signal_setting)();
3145 }
3146
3147 set_signal_handler(SIGSEGV, true);
3148 set_signal_handler(SIGPIPE, true);
3149 set_signal_handler(SIGBUS, true);
3150 set_signal_handler(SIGILL, true);
3151 set_signal_handler(SIGFPE, true);
3152 set_signal_handler(SIGXFSZ, true);
3153
3154 #if defined(__APPLE__)
3155 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3156 // signals caught and handled by the JVM. To work around this, we reset the mach task
3157 // signal handler that's placed on our process by CrashReporter. This disables
3158 // CrashReporter-based reporting.
3159 //
3160 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3161 // on caught fatal signals.
3162 //
3163 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3164 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3165 // exception handling, while leaving the standard BSD signal handlers functional.
3166 kern_return_t kr;
3167 kr = task_set_exception_ports(mach_task_self(),
3168 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3169 MACH_PORT_NULL,
3170 EXCEPTION_STATE_IDENTITY,
3171 MACHINE_THREAD_STATE);
3172
3173 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3174 #endif
3175
3176 if (libjsig_is_loaded) {
3177 // Tell libjsig jvm finishes setting signal handlers
3178 (*end_signal_setting)();
3179 }
3180
3181 // We don't activate signal checker if libjsig is in place, we trust ourselves
3182 // and if UserSignalHandler is installed all bets are off
3183 if (CheckJNICalls) {
3184 if (libjsig_is_loaded) {
3185 if (PrintJNIResolving) {
3186 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3187 }
3188 check_signals = false;
3189 }
3190 if (AllowUserSignalHandlers) {
3191 if (PrintJNIResolving) {
3192 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3193 }
3194 check_signals = false;
3195 }
3196 }
3197 }
3198 }
3199
3200
3201 /////
3202 // glibc on Bsd platform uses non-documented flag
3203 // to indicate, that some special sort of signal
3204 // trampoline is used.
3205 // We will never set this flag, and we should
3206 // ignore this flag in our diagnostic
3207 #ifdef SIGNIFICANT_SIGNAL_MASK
3208 #undef SIGNIFICANT_SIGNAL_MASK
3209 #endif
3210 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3211
3212 static const char* get_signal_handler_name(address handler,
3213 char* buf, int buflen) {
3214 int offset;
3215 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3216 if (found) {
3217 // skip directory names
3218 const char *p1, *p2;
3219 p1 = buf;
3220 size_t len = strlen(os::file_separator());
3221 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3222 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3223 } else {
3224 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3225 }
3226 return buf;
3227 }
3228
3229 static void print_signal_handler(outputStream* st, int sig,
3230 char* buf, size_t buflen) {
3231 struct sigaction sa;
3232
3233 sigaction(sig, NULL, &sa);
3234
3235 // See comment for SIGNIFICANT_SIGNAL_MASK define
3236 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3237
3238 st->print("%s: ", os::exception_name(sig, buf, buflen));
3239
3240 address handler = (sa.sa_flags & SA_SIGINFO)
3241 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3242 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3243
3244 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3245 st->print("SIG_DFL");
3246 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3247 st->print("SIG_IGN");
3248 } else {
3249 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3250 }
3251
3252 st->print(", sa_mask[0]=");
3253 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3254
3255 address rh = VMError::get_resetted_sighandler(sig);
3256 // May be, handler was resetted by VMError?
3257 if (rh != NULL) {
3258 handler = rh;
3259 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3260 }
3261
3262 st->print(", sa_flags=");
3263 os::Posix::print_sa_flags(st, sa.sa_flags);
3264
3265 // Check: is it our handler?
3266 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3267 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3268 // It is our signal handler
3269 // check for flags, reset system-used one!
3270 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3271 st->print(
3272 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3273 os::Bsd::get_our_sigflags(sig));
3274 }
3275 }
3276 st->cr();
3277 }
3278
3279
3280 #define DO_SIGNAL_CHECK(sig) \
3281 do { \
3282 if (!sigismember(&check_signal_done, sig)) { \
3283 os::Bsd::check_signal_handler(sig); \
3284 } \
3285 } while (0)
3286
3287 // This method is a periodic task to check for misbehaving JNI applications
3288 // under CheckJNI, we can add any periodic checks here
3289
3290 void os::run_periodic_checks() {
3291
3292 if (check_signals == false) return;
3293
3294 // SEGV and BUS if overridden could potentially prevent
3295 // generation of hs*.log in the event of a crash, debugging
3296 // such a case can be very challenging, so we absolutely
3297 // check the following for a good measure:
3298 DO_SIGNAL_CHECK(SIGSEGV);
3299 DO_SIGNAL_CHECK(SIGILL);
3300 DO_SIGNAL_CHECK(SIGFPE);
3301 DO_SIGNAL_CHECK(SIGBUS);
3302 DO_SIGNAL_CHECK(SIGPIPE);
3303 DO_SIGNAL_CHECK(SIGXFSZ);
3304
3305
3306 // ReduceSignalUsage allows the user to override these handlers
3307 // see comments at the very top and jvm_solaris.h
3308 if (!ReduceSignalUsage) {
3309 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3310 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3311 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3312 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3313 }
3314
3315 DO_SIGNAL_CHECK(SR_signum);
3316 }
3317
3318 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3319
3320 static os_sigaction_t os_sigaction = NULL;
3321
3322 void os::Bsd::check_signal_handler(int sig) {
3323 char buf[O_BUFLEN];
3324 address jvmHandler = NULL;
3325
3326
3327 struct sigaction act;
3328 if (os_sigaction == NULL) {
3329 // only trust the default sigaction, in case it has been interposed
3330 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3331 if (os_sigaction == NULL) return;
3332 }
3333
3334 os_sigaction(sig, (struct sigaction*)NULL, &act);
3335
3336
3337 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3338
3339 address thisHandler = (act.sa_flags & SA_SIGINFO)
3340 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3341 : CAST_FROM_FN_PTR(address, act.sa_handler);
3342
3343
3344 switch (sig) {
3345 case SIGSEGV:
3346 case SIGBUS:
3347 case SIGFPE:
3348 case SIGPIPE:
3349 case SIGILL:
3350 case SIGXFSZ:
3351 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3352 break;
3353
3354 case SHUTDOWN1_SIGNAL:
3355 case SHUTDOWN2_SIGNAL:
3356 case SHUTDOWN3_SIGNAL:
3357 case BREAK_SIGNAL:
3358 jvmHandler = (address)user_handler();
3359 break;
3360
3361 default:
3362 if (sig == SR_signum) {
3363 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3364 } else {
3365 return;
3366 }
3367 break;
3368 }
3369
3370 if (thisHandler != jvmHandler) {
3371 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3372 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3373 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3374 // No need to check this sig any longer
3375 sigaddset(&check_signal_done, sig);
3376 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3377 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3378 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3379 exception_name(sig, buf, O_BUFLEN));
3380 }
3381 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3382 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3383 tty->print("expected:");
3384 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3385 tty->cr();
3386 tty->print(" found:");
3387 os::Posix::print_sa_flags(tty, act.sa_flags);
3388 tty->cr();
3389 // No need to check this sig any longer
3390 sigaddset(&check_signal_done, sig);
3391 }
3392
3393 // Dump all the signal
3394 if (sigismember(&check_signal_done, sig)) {
3395 print_signal_handlers(tty, buf, O_BUFLEN);
3396 }
3397 }
3398
3399 extern void report_error(char* file_name, int line_no, char* title,
3400 char* format, ...);
3401
3402 // this is called _before_ the most of global arguments have been parsed
3403 void os::init(void) {
3404 char dummy; // used to get a guess on initial stack address
3405 // first_hrtime = gethrtime();
3406
3407 // With BsdThreads the JavaMain thread pid (primordial thread)
3408 // is different than the pid of the java launcher thread.
3409 // So, on Bsd, the launcher thread pid is passed to the VM
3410 // via the sun.java.launcher.pid property.
3411 // Use this property instead of getpid() if it was correctly passed.
3412 // See bug 6351349.
3413 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3414
3415 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3416
3417 clock_tics_per_sec = CLK_TCK;
3418
3419 init_random(1234567);
3420
3421 ThreadCritical::initialize();
3422
3423 Bsd::set_page_size(getpagesize());
3424 if (Bsd::page_size() == -1) {
3425 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3426 }
3427 init_page_sizes((size_t) Bsd::page_size());
3428
3429 Bsd::initialize_system_info();
3430
3431 // main_thread points to the aboriginal thread
3432 Bsd::_main_thread = pthread_self();
3433
3434 Bsd::clock_init();
3435 initial_time_count = javaTimeNanos();
3436
3437 #ifdef __APPLE__
3438 // XXXDARWIN
3439 // Work around the unaligned VM callbacks in hotspot's
3440 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3441 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3442 // alignment when doing symbol lookup. To work around this, we force early
3443 // binding of all symbols now, thus binding when alignment is known-good.
3444 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3445 #endif
3446 }
3447
3448 // To install functions for atexit system call
3449 extern "C" {
3450 static void perfMemory_exit_helper() {
3451 perfMemory_exit();
3452 }
3453 }
3454
3455 // this is called _after_ the global arguments have been parsed
3456 jint os::init_2(void) {
3457 // Allocate a single page and mark it as readable for safepoint polling
3458 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3459 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page");
3460
3461 os::set_polling_page(polling_page);
3462 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
3463
3464 if (!UseMembar) {
3465 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3466 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page");
3467 os::set_memory_serialize_page(mem_serialize_page);
3468 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
3469 }
3470
3471 // initialize suspend/resume support - must do this before signal_sets_init()
3472 if (SR_initialize() != 0) {
3473 perror("SR_initialize failed");
3474 return JNI_ERR;
3475 }
3476
3477 Bsd::signal_sets_init();
3478 Bsd::install_signal_handlers();
3479
3480 // Check minimum allowable stack size for thread creation and to initialize
3481 // the java system classes, including StackOverflowError - depends on page
3482 // size. Add a page for compiler2 recursion in main thread.
3483 // Add in 2*BytesPerWord times page size to account for VM stack during
3484 // class initialization depending on 32 or 64 bit VM.
3485 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
3486 JavaThread::stack_guard_zone_size() +
3487 JavaThread::stack_shadow_zone_size() +
3488 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
3489
3490 size_t threadStackSizeInBytes = ThreadStackSize * K;
3491 if (threadStackSizeInBytes != 0 &&
3492 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
3493 tty->print_cr("\nThe stack size specified is too small, "
3494 "Specify at least %dk",
3495 os::Bsd::min_stack_allowed/ K);
3496 return JNI_ERR;
3497 }
3498
3499 // Make the stack size a multiple of the page size so that
3500 // the yellow/red zones can be guarded.
3501 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
3502 vm_page_size()));
3503
3504 if (MaxFDLimit) {
3505 // set the number of file descriptors to max. print out error
3506 // if getrlimit/setrlimit fails but continue regardless.
3507 struct rlimit nbr_files;
3508 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3509 if (status != 0) {
3510 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3511 } else {
3512 nbr_files.rlim_cur = nbr_files.rlim_max;
3513
3514 #ifdef __APPLE__
3515 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3516 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3517 // be used instead
3518 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3519 #endif
3520
3521 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3522 if (status != 0) {
3523 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3524 }
3525 }
3526 }
3527
3528 // at-exit methods are called in the reverse order of their registration.
3529 // atexit functions are called on return from main or as a result of a
3530 // call to exit(3C). There can be only 32 of these functions registered
3531 // and atexit() does not set errno.
3532
3533 if (PerfAllowAtExitRegistration) {
3534 // only register atexit functions if PerfAllowAtExitRegistration is set.
3535 // atexit functions can be delayed until process exit time, which
3536 // can be problematic for embedded VM situations. Embedded VMs should
3537 // call DestroyJavaVM() to assure that VM resources are released.
3538
3539 // note: perfMemory_exit_helper atexit function may be removed in
3540 // the future if the appropriate cleanup code can be added to the
3541 // VM_Exit VMOperation's doit method.
3542 if (atexit(perfMemory_exit_helper) != 0) {
3543 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3544 }
3545 }
3546
3547 // initialize thread priority policy
3548 prio_init();
3549
3550 #ifdef __APPLE__
3551 // dynamically link to objective c gc registration
3552 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3553 if (handleLibObjc != NULL) {
3554 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3555 }
3556 #endif
3557
3558 return JNI_OK;
3559 }
3560
3561 // Mark the polling page as unreadable
3562 void os::make_polling_page_unreadable(void) {
3563 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3564 fatal("Could not disable polling page");
3565 }
3566 }
3567
3568 // Mark the polling page as readable
3569 void os::make_polling_page_readable(void) {
3570 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3571 fatal("Could not enable polling page");
3572 }
3573 }
3574
3575 int os::active_processor_count() {
3576 return _processor_count;
3577 }
3578
3579 void os::set_native_thread_name(const char *name) {
3580 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3581 // This is only supported in Snow Leopard and beyond
3582 if (name != NULL) {
3583 // Add a "Java: " prefix to the name
3584 char buf[MAXTHREADNAMESIZE];
3585 snprintf(buf, sizeof(buf), "Java: %s", name);
3586 pthread_setname_np(buf);
3587 }
3588 #endif
3589 }
3590
3591 bool os::distribute_processes(uint length, uint* distribution) {
3592 // Not yet implemented.
3593 return false;
3594 }
3595
3596 bool os::bind_to_processor(uint processor_id) {
3597 // Not yet implemented.
3598 return false;
3599 }
3600
3601 void os::SuspendedThreadTask::internal_do_task() {
3602 if (do_suspend(_thread->osthread())) {
3603 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3604 do_task(context);
3605 do_resume(_thread->osthread());
3606 }
3607 }
3608
3609 ///
3610 class PcFetcher : public os::SuspendedThreadTask {
3611 public:
3612 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3613 ExtendedPC result();
3614 protected:
3615 void do_task(const os::SuspendedThreadTaskContext& context);
3616 private:
3617 ExtendedPC _epc;
3618 };
3619
3620 ExtendedPC PcFetcher::result() {
3621 guarantee(is_done(), "task is not done yet.");
3622 return _epc;
3623 }
3624
3625 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3626 Thread* thread = context.thread();
3627 OSThread* osthread = thread->osthread();
3628 if (osthread->ucontext() != NULL) {
3629 _epc = os::Bsd::ucontext_get_pc((const ucontext_t *) context.ucontext());
3630 } else {
3631 // NULL context is unexpected, double-check this is the VMThread
3632 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3633 }
3634 }
3635
3636 // Suspends the target using the signal mechanism and then grabs the PC before
3637 // resuming the target. Used by the flat-profiler only
3638 ExtendedPC os::get_thread_pc(Thread* thread) {
3639 // Make sure that it is called by the watcher for the VMThread
3640 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3641 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3642
3643 PcFetcher fetcher(thread);
3644 fetcher.run();
3645 return fetcher.result();
3646 }
3647
3648 ////////////////////////////////////////////////////////////////////////////////
3649 // debug support
3650
3651 bool os::find(address addr, outputStream* st) {
3652 Dl_info dlinfo;
3653 memset(&dlinfo, 0, sizeof(dlinfo));
3654 if (dladdr(addr, &dlinfo) != 0) {
3655 st->print(PTR_FORMAT ": ", addr);
3656 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3657 st->print("%s+%#x", dlinfo.dli_sname,
3658 addr - (intptr_t)dlinfo.dli_saddr);
3659 } else if (dlinfo.dli_fbase != NULL) {
3660 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3661 } else {
3662 st->print("<absolute address>");
3663 }
3664 if (dlinfo.dli_fname != NULL) {
3665 st->print(" in %s", dlinfo.dli_fname);
3666 }
3667 if (dlinfo.dli_fbase != NULL) {
3668 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3669 }
3670 st->cr();
3671
3672 if (Verbose) {
3673 // decode some bytes around the PC
3674 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3675 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3676 address lowest = (address) dlinfo.dli_sname;
3677 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3678 if (begin < lowest) begin = lowest;
3679 Dl_info dlinfo2;
3680 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3681 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3682 end = (address) dlinfo2.dli_saddr;
3683 }
3684 Disassembler::decode(begin, end, st);
3685 }
3686 return true;
3687 }
3688 return false;
3689 }
3690
3691 ////////////////////////////////////////////////////////////////////////////////
3692 // misc
3693
3694 // This does not do anything on Bsd. This is basically a hook for being
3695 // able to use structured exception handling (thread-local exception filters)
3696 // on, e.g., Win32.
3697 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3698 const methodHandle& method, JavaCallArguments* args,
3699 Thread* thread) {
3700 f(value, method, args, thread);
3701 }
3702
3703 void os::print_statistics() {
3704 }
3705
3706 bool os::message_box(const char* title, const char* message) {
3707 int i;
3708 fdStream err(defaultStream::error_fd());
3709 for (i = 0; i < 78; i++) err.print_raw("=");
3710 err.cr();
3711 err.print_raw_cr(title);
3712 for (i = 0; i < 78; i++) err.print_raw("-");
3713 err.cr();
3714 err.print_raw_cr(message);
3715 for (i = 0; i < 78; i++) err.print_raw("=");
3716 err.cr();
3717
3718 char buf[16];
3719 // Prevent process from exiting upon "read error" without consuming all CPU
3720 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3721
3722 return buf[0] == 'y' || buf[0] == 'Y';
3723 }
3724
3725 int os::stat(const char *path, struct stat *sbuf) {
3726 char pathbuf[MAX_PATH];
3727 if (strlen(path) > MAX_PATH - 1) {
3728 errno = ENAMETOOLONG;
3729 return -1;
3730 }
3731 os::native_path(strcpy(pathbuf, path));
3732 return ::stat(pathbuf, sbuf);
3733 }
3734
3735 static inline struct timespec get_mtime(const char* filename) {
3736 struct stat st;
3737 int ret = os::stat(filename, &st);
3738 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
3739 #ifdef __APPLE__
3740 return st.st_mtimespec;
3741 #else
3742 return st.st_mtim;
3743 #endif
3744 }
3745
3746 int os::compare_file_modified_times(const char* file1, const char* file2) {
3747 struct timespec filetime1 = get_mtime(file1);
3748 struct timespec filetime2 = get_mtime(file2);
3749 int diff = filetime1.tv_sec - filetime2.tv_sec;
3750 if (diff == 0) {
3751 return filetime1.tv_nsec - filetime2.tv_nsec;
3752 }
3753 return diff;
3754 }
3755
3756
3757 bool os::check_heap(bool force) {
3758 return true;
3759 }
3760
3761 // Is a (classpath) directory empty?
3762 bool os::dir_is_empty(const char* path) {
3763 DIR *dir = NULL;
3764 struct dirent *ptr;
3765
3766 dir = opendir(path);
3767 if (dir == NULL) return true;
3768
3769 // Scan the directory
3770 bool result = true;
3771 char buf[sizeof(struct dirent) + MAX_PATH];
3772 while (result && (ptr = ::readdir(dir)) != NULL) {
3773 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3774 result = false;
3775 }
3776 }
3777 closedir(dir);
3778 return result;
3779 }
3780
3781 // This code originates from JDK's sysOpen and open64_w
3782 // from src/solaris/hpi/src/system_md.c
3783
3784 int os::open(const char *path, int oflag, int mode) {
3785 if (strlen(path) > MAX_PATH - 1) {
3786 errno = ENAMETOOLONG;
3787 return -1;
3788 }
3789 int fd;
3790
3791 fd = ::open(path, oflag, mode);
3792 if (fd == -1) return -1;
3793
3794 // If the open succeeded, the file might still be a directory
3795 {
3796 struct stat buf;
3797 int ret = ::fstat(fd, &buf);
3798 int st_mode = buf.st_mode;
3799
3800 if (ret != -1) {
3801 if ((st_mode & S_IFMT) == S_IFDIR) {
3802 errno = EISDIR;
3803 ::close(fd);
3804 return -1;
3805 }
3806 } else {
3807 ::close(fd);
3808 return -1;
3809 }
3810 }
3811
3812 // All file descriptors that are opened in the JVM and not
3813 // specifically destined for a subprocess should have the
3814 // close-on-exec flag set. If we don't set it, then careless 3rd
3815 // party native code might fork and exec without closing all
3816 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3817 // UNIXProcess.c), and this in turn might:
3818 //
3819 // - cause end-of-file to fail to be detected on some file
3820 // descriptors, resulting in mysterious hangs, or
3821 //
3822 // - might cause an fopen in the subprocess to fail on a system
3823 // suffering from bug 1085341.
3824 //
3825 // (Yes, the default setting of the close-on-exec flag is a Unix
3826 // design flaw)
3827 //
3828 // See:
3829 // 1085341: 32-bit stdio routines should support file descriptors >255
3830 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3831 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3832 //
3833 #ifdef FD_CLOEXEC
3834 {
3835 int flags = ::fcntl(fd, F_GETFD);
3836 if (flags != -1) {
3837 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3838 }
3839 }
3840 #endif
3841
3842 return fd;
3843 }
3844
3845
3846 // create binary file, rewriting existing file if required
3847 int os::create_binary_file(const char* path, bool rewrite_existing) {
3848 int oflags = O_WRONLY | O_CREAT;
3849 if (!rewrite_existing) {
3850 oflags |= O_EXCL;
3851 }
3852 return ::open(path, oflags, S_IREAD | S_IWRITE);
3853 }
3854
3855 // return current position of file pointer
3856 jlong os::current_file_offset(int fd) {
3857 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3858 }
3859
3860 // move file pointer to the specified offset
3861 jlong os::seek_to_file_offset(int fd, jlong offset) {
3862 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3863 }
3864
3865 // This code originates from JDK's sysAvailable
3866 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3867
3868 int os::available(int fd, jlong *bytes) {
3869 jlong cur, end;
3870 int mode;
3871 struct stat buf;
3872
3873 if (::fstat(fd, &buf) >= 0) {
3874 mode = buf.st_mode;
3875 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3876 int n;
3877 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3878 *bytes = n;
3879 return 1;
3880 }
3881 }
3882 }
3883 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3884 return 0;
3885 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3886 return 0;
3887 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3888 return 0;
3889 }
3890 *bytes = end - cur;
3891 return 1;
3892 }
3893
3894 // Map a block of memory.
3895 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3896 char *addr, size_t bytes, bool read_only,
3897 bool allow_exec) {
3898 int prot;
3899 int flags;
3900
3901 if (read_only) {
3902 prot = PROT_READ;
3903 flags = MAP_SHARED;
3904 } else {
3905 prot = PROT_READ | PROT_WRITE;
3906 flags = MAP_PRIVATE;
3907 }
3908
3909 if (allow_exec) {
3910 prot |= PROT_EXEC;
3911 }
3912
3913 if (addr != NULL) {
3914 flags |= MAP_FIXED;
3915 }
3916
3917 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3918 fd, file_offset);
3919 if (mapped_address == MAP_FAILED) {
3920 return NULL;
3921 }
3922 return mapped_address;
3923 }
3924
3925
3926 // Remap a block of memory.
3927 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3928 char *addr, size_t bytes, bool read_only,
3929 bool allow_exec) {
3930 // same as map_memory() on this OS
3931 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3932 allow_exec);
3933 }
3934
3935
3936 // Unmap a block of memory.
3937 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3938 return munmap(addr, bytes) == 0;
3939 }
3940
3941 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3942 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3943 // of a thread.
3944 //
3945 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3946 // the fast estimate available on the platform.
3947
3948 jlong os::current_thread_cpu_time() {
3949 #ifdef __APPLE__
3950 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3951 #else
3952 Unimplemented();
3953 return 0;
3954 #endif
3955 }
3956
3957 jlong os::thread_cpu_time(Thread* thread) {
3958 #ifdef __APPLE__
3959 return os::thread_cpu_time(thread, true /* user + sys */);
3960 #else
3961 Unimplemented();
3962 return 0;
3963 #endif
3964 }
3965
3966 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3967 #ifdef __APPLE__
3968 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3969 #else
3970 Unimplemented();
3971 return 0;
3972 #endif
3973 }
3974
3975 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3976 #ifdef __APPLE__
3977 struct thread_basic_info tinfo;
3978 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3979 kern_return_t kr;
3980 thread_t mach_thread;
3981
3982 mach_thread = thread->osthread()->thread_id();
3983 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3984 if (kr != KERN_SUCCESS) {
3985 return -1;
3986 }
3987
3988 if (user_sys_cpu_time) {
3989 jlong nanos;
3990 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3991 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3992 return nanos;
3993 } else {
3994 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3995 }
3996 #else
3997 Unimplemented();
3998 return 0;
3999 #endif
4000 }
4001
4002
4003 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4004 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4005 info_ptr->may_skip_backward = false; // elapsed time not wall time
4006 info_ptr->may_skip_forward = false; // elapsed time not wall time
4007 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4008 }
4009
4010 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4011 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4012 info_ptr->may_skip_backward = false; // elapsed time not wall time
4013 info_ptr->may_skip_forward = false; // elapsed time not wall time
4014 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4015 }
4016
4017 bool os::is_thread_cpu_time_supported() {
4018 #ifdef __APPLE__
4019 return true;
4020 #else
4021 return false;
4022 #endif
4023 }
4024
4025 // System loadavg support. Returns -1 if load average cannot be obtained.
4026 // Bsd doesn't yet have a (official) notion of processor sets,
4027 // so just return the system wide load average.
4028 int os::loadavg(double loadavg[], int nelem) {
4029 return ::getloadavg(loadavg, nelem);
4030 }
4031
4032 void os::pause() {
4033 char filename[MAX_PATH];
4034 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4035 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4036 } else {
4037 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4038 }
4039
4040 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4041 if (fd != -1) {
4042 struct stat buf;
4043 ::close(fd);
4044 while (::stat(filename, &buf) == 0) {
4045 (void)::poll(NULL, 0, 100);
4046 }
4047 } else {
4048 jio_fprintf(stderr,
4049 "Could not open pause file '%s', continuing immediately.\n", filename);
4050 }
4051 }
4052
4053
4054 // Refer to the comments in os_solaris.cpp park-unpark. The next two
4055 // comment paragraphs are worth repeating here:
4056 //
4057 // Assumption:
4058 // Only one parker can exist on an event, which is why we allocate
4059 // them per-thread. Multiple unparkers can coexist.
4060 //
4061 // _Event serves as a restricted-range semaphore.
4062 // -1 : thread is blocked, i.e. there is a waiter
4063 // 0 : neutral: thread is running or ready,
4064 // could have been signaled after a wait started
4065 // 1 : signaled - thread is running or ready
4066 //
4067
4068 // utility to compute the abstime argument to timedwait:
4069 // millis is the relative timeout time
4070 // abstime will be the absolute timeout time
4071 // TODO: replace compute_abstime() with unpackTime()
4072
4073 static struct timespec* compute_abstime(struct timespec* abstime,
4074 jlong millis) {
4075 if (millis < 0) millis = 0;
4076 struct timeval now;
4077 int status = gettimeofday(&now, NULL);
4078 assert(status == 0, "gettimeofday");
4079 jlong seconds = millis / 1000;
4080 millis %= 1000;
4081 if (seconds > 50000000) { // see man cond_timedwait(3T)
4082 seconds = 50000000;
4083 }
4084 abstime->tv_sec = now.tv_sec + seconds;
4085 long usec = now.tv_usec + millis * 1000;
4086 if (usec >= 1000000) {
4087 abstime->tv_sec += 1;
4088 usec -= 1000000;
4089 }
4090 abstime->tv_nsec = usec * 1000;
4091 return abstime;
4092 }
4093
4094 void os::PlatformEvent::park() { // AKA "down()"
4095 // Transitions for _Event:
4096 // -1 => -1 : illegal
4097 // 1 => 0 : pass - return immediately
4098 // 0 => -1 : block; then set _Event to 0 before returning
4099
4100 // Invariant: Only the thread associated with the Event/PlatformEvent
4101 // may call park().
4102 // TODO: assert that _Assoc != NULL or _Assoc == Self
4103 assert(_nParked == 0, "invariant");
4104
4105 int v;
4106 for (;;) {
4107 v = _Event;
4108 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4109 }
4110 guarantee(v >= 0, "invariant");
4111 if (v == 0) {
4112 // Do this the hard way by blocking ...
4113 int status = pthread_mutex_lock(_mutex);
4114 assert_status(status == 0, status, "mutex_lock");
4115 guarantee(_nParked == 0, "invariant");
4116 ++_nParked;
4117 while (_Event < 0) {
4118 status = pthread_cond_wait(_cond, _mutex);
4119 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4120 // Treat this the same as if the wait was interrupted
4121 if (status == ETIMEDOUT) { status = EINTR; }
4122 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4123 }
4124 --_nParked;
4125
4126 _Event = 0;
4127 status = pthread_mutex_unlock(_mutex);
4128 assert_status(status == 0, status, "mutex_unlock");
4129 // Paranoia to ensure our locked and lock-free paths interact
4130 // correctly with each other.
4131 OrderAccess::fence();
4132 }
4133 guarantee(_Event >= 0, "invariant");
4134 }
4135
4136 int os::PlatformEvent::park(jlong millis) {
4137 // Transitions for _Event:
4138 // -1 => -1 : illegal
4139 // 1 => 0 : pass - return immediately
4140 // 0 => -1 : block; then set _Event to 0 before returning
4141
4142 guarantee(_nParked == 0, "invariant");
4143
4144 int v;
4145 for (;;) {
4146 v = _Event;
4147 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4148 }
4149 guarantee(v >= 0, "invariant");
4150 if (v != 0) return OS_OK;
4151
4152 // We do this the hard way, by blocking the thread.
4153 // Consider enforcing a minimum timeout value.
4154 struct timespec abst;
4155 compute_abstime(&abst, millis);
4156
4157 int ret = OS_TIMEOUT;
4158 int status = pthread_mutex_lock(_mutex);
4159 assert_status(status == 0, status, "mutex_lock");
4160 guarantee(_nParked == 0, "invariant");
4161 ++_nParked;
4162
4163 // Object.wait(timo) will return because of
4164 // (a) notification
4165 // (b) timeout
4166 // (c) thread.interrupt
4167 //
4168 // Thread.interrupt and object.notify{All} both call Event::set.
4169 // That is, we treat thread.interrupt as a special case of notification.
4170 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4171 // We assume all ETIME returns are valid.
4172 //
4173 // TODO: properly differentiate simultaneous notify+interrupt.
4174 // In that case, we should propagate the notify to another waiter.
4175
4176 while (_Event < 0) {
4177 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4178 assert_status(status == 0 || status == EINTR ||
4179 status == ETIMEDOUT,
4180 status, "cond_timedwait");
4181 if (!FilterSpuriousWakeups) break; // previous semantics
4182 if (status == ETIMEDOUT) break;
4183 // We consume and ignore EINTR and spurious wakeups.
4184 }
4185 --_nParked;
4186 if (_Event >= 0) {
4187 ret = OS_OK;
4188 }
4189 _Event = 0;
4190 status = pthread_mutex_unlock(_mutex);
4191 assert_status(status == 0, status, "mutex_unlock");
4192 assert(_nParked == 0, "invariant");
4193 // Paranoia to ensure our locked and lock-free paths interact
4194 // correctly with each other.
4195 OrderAccess::fence();
4196 return ret;
4197 }
4198
4199 void os::PlatformEvent::unpark() {
4200 // Transitions for _Event:
4201 // 0 => 1 : just return
4202 // 1 => 1 : just return
4203 // -1 => either 0 or 1; must signal target thread
4204 // That is, we can safely transition _Event from -1 to either
4205 // 0 or 1.
4206 // See also: "Semaphores in Plan 9" by Mullender & Cox
4207 //
4208 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4209 // that it will take two back-to-back park() calls for the owning
4210 // thread to block. This has the benefit of forcing a spurious return
4211 // from the first park() call after an unpark() call which will help
4212 // shake out uses of park() and unpark() without condition variables.
4213
4214 if (Atomic::xchg(1, &_Event) >= 0) return;
4215
4216 // Wait for the thread associated with the event to vacate
4217 int status = pthread_mutex_lock(_mutex);
4218 assert_status(status == 0, status, "mutex_lock");
4219 int AnyWaiters = _nParked;
4220 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4221 status = pthread_mutex_unlock(_mutex);
4222 assert_status(status == 0, status, "mutex_unlock");
4223 if (AnyWaiters != 0) {
4224 // Note that we signal() *after* dropping the lock for "immortal" Events.
4225 // This is safe and avoids a common class of futile wakeups. In rare
4226 // circumstances this can cause a thread to return prematurely from
4227 // cond_{timed}wait() but the spurious wakeup is benign and the victim
4228 // will simply re-test the condition and re-park itself.
4229 // This provides particular benefit if the underlying platform does not
4230 // provide wait morphing.
4231 status = pthread_cond_signal(_cond);
4232 assert_status(status == 0, status, "cond_signal");
4233 }
4234 }
4235
4236
4237 // JSR166
4238 // -------------------------------------------------------
4239
4240 // The solaris and bsd implementations of park/unpark are fairly
4241 // conservative for now, but can be improved. They currently use a
4242 // mutex/condvar pair, plus a a count.
4243 // Park decrements count if > 0, else does a condvar wait. Unpark
4244 // sets count to 1 and signals condvar. Only one thread ever waits
4245 // on the condvar. Contention seen when trying to park implies that someone
4246 // is unparking you, so don't wait. And spurious returns are fine, so there
4247 // is no need to track notifications.
4248
4249 #define MAX_SECS 100000000
4250
4251 // This code is common to bsd and solaris and will be moved to a
4252 // common place in dolphin.
4253 //
4254 // The passed in time value is either a relative time in nanoseconds
4255 // or an absolute time in milliseconds. Either way it has to be unpacked
4256 // into suitable seconds and nanoseconds components and stored in the
4257 // given timespec structure.
4258 // Given time is a 64-bit value and the time_t used in the timespec is only
4259 // a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4260 // overflow if times way in the future are given. Further on Solaris versions
4261 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4262 // number of seconds, in abstime, is less than current_time + 100,000,000.
4263 // As it will be 28 years before "now + 100000000" will overflow we can
4264 // ignore overflow and just impose a hard-limit on seconds using the value
4265 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4266 // years from "now".
4267
4268 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4269 assert(time > 0, "convertTime");
4270
4271 struct timeval now;
4272 int status = gettimeofday(&now, NULL);
4273 assert(status == 0, "gettimeofday");
4274
4275 time_t max_secs = now.tv_sec + MAX_SECS;
4276
4277 if (isAbsolute) {
4278 jlong secs = time / 1000;
4279 if (secs > max_secs) {
4280 absTime->tv_sec = max_secs;
4281 } else {
4282 absTime->tv_sec = secs;
4283 }
4284 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4285 } else {
4286 jlong secs = time / NANOSECS_PER_SEC;
4287 if (secs >= MAX_SECS) {
4288 absTime->tv_sec = max_secs;
4289 absTime->tv_nsec = 0;
4290 } else {
4291 absTime->tv_sec = now.tv_sec + secs;
4292 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4293 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4294 absTime->tv_nsec -= NANOSECS_PER_SEC;
4295 ++absTime->tv_sec; // note: this must be <= max_secs
4296 }
4297 }
4298 }
4299 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4300 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4301 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4302 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4303 }
4304
4305 void Parker::park(bool isAbsolute, jlong time) {
4306 // Ideally we'd do something useful while spinning, such
4307 // as calling unpackTime().
4308
4309 // Optional fast-path check:
4310 // Return immediately if a permit is available.
4311 // We depend on Atomic::xchg() having full barrier semantics
4312 // since we are doing a lock-free update to _counter.
4313 if (Atomic::xchg(0, &_counter) > 0) return;
4314
4315 Thread* thread = Thread::current();
4316 assert(thread->is_Java_thread(), "Must be JavaThread");
4317 JavaThread *jt = (JavaThread *)thread;
4318
4319 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4320 // Check interrupt before trying to wait
4321 if (Thread::is_interrupted(thread, false)) {
4322 return;
4323 }
4324
4325 // Next, demultiplex/decode time arguments
4326 struct timespec absTime;
4327 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4328 return;
4329 }
4330 if (time > 0) {
4331 unpackTime(&absTime, isAbsolute, time);
4332 }
4333
4334
4335 // Enter safepoint region
4336 // Beware of deadlocks such as 6317397.
4337 // The per-thread Parker:: mutex is a classic leaf-lock.
4338 // In particular a thread must never block on the Threads_lock while
4339 // holding the Parker:: mutex. If safepoints are pending both the
4340 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4341 ThreadBlockInVM tbivm(jt);
4342
4343 // Don't wait if cannot get lock since interference arises from
4344 // unblocking. Also. check interrupt before trying wait
4345 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4346 return;
4347 }
4348
4349 int status;
4350 if (_counter > 0) { // no wait needed
4351 _counter = 0;
4352 status = pthread_mutex_unlock(_mutex);
4353 assert_status(status == 0, status, "invariant");
4354 // Paranoia to ensure our locked and lock-free paths interact
4355 // correctly with each other and Java-level accesses.
4356 OrderAccess::fence();
4357 return;
4358 }
4359
4360 #ifdef ASSERT
4361 // Don't catch signals while blocked; let the running threads have the signals.
4362 // (This allows a debugger to break into the running thread.)
4363 sigset_t oldsigs;
4364 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4365 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4366 #endif
4367
4368 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4369 jt->set_suspend_equivalent();
4370 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4371
4372 if (time == 0) {
4373 status = pthread_cond_wait(_cond, _mutex);
4374 } else {
4375 status = pthread_cond_timedwait(_cond, _mutex, &absTime);
4376 }
4377 assert_status(status == 0 || status == EINTR ||
4378 status == ETIMEDOUT,
4379 status, "cond_timedwait");
4380
4381 #ifdef ASSERT
4382 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4383 #endif
4384
4385 _counter = 0;
4386 status = pthread_mutex_unlock(_mutex);
4387 assert_status(status == 0, status, "invariant");
4388 // Paranoia to ensure our locked and lock-free paths interact
4389 // correctly with each other and Java-level accesses.
4390 OrderAccess::fence();
4391
4392 // If externally suspended while waiting, re-suspend
4393 if (jt->handle_special_suspend_equivalent_condition()) {
4394 jt->java_suspend_self();
4395 }
4396 }
4397
4398 void Parker::unpark() {
4399 int status = pthread_mutex_lock(_mutex);
4400 assert_status(status == 0, status, "invariant");
4401 const int s = _counter;
4402 _counter = 1;
4403 status = pthread_mutex_unlock(_mutex);
4404 assert_status(status == 0, status, "invariant");
4405 if (s < 1) {
4406 status = pthread_cond_signal(_cond);
4407 assert_status(status == 0, status, "invariant");
4408 }
4409 }
4410
4411
4412 // Darwin has no "environ" in a dynamic library.
4413 #ifdef __APPLE__
4414 #include <crt_externs.h>
4415 #define environ (*_NSGetEnviron())
4416 #else
4417 extern char** environ;
4418 #endif
4419
4420 // Run the specified command in a separate process. Return its exit value,
4421 // or -1 on failure (e.g. can't fork a new process).
4422 // Unlike system(), this function can be called from signal handler. It
4423 // doesn't block SIGINT et al.
4424 int os::fork_and_exec(char* cmd) {
4425 const char * argv[4] = {"sh", "-c", cmd, NULL};
4426
4427 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4428 // pthread_atfork handlers and reset pthread library. All we need is a
4429 // separate process to execve. Make a direct syscall to fork process.
4430 // On IA64 there's no fork syscall, we have to use fork() and hope for
4431 // the best...
4432 pid_t pid = fork();
4433
4434 if (pid < 0) {
4435 // fork failed
4436 return -1;
4437
4438 } else if (pid == 0) {
4439 // child process
4440
4441 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4442 // first to kill every thread on the thread list. Because this list is
4443 // not reset by fork() (see notes above), execve() will instead kill
4444 // every thread in the parent process. We know this is the only thread
4445 // in the new process, so make a system call directly.
4446 // IA64 should use normal execve() from glibc to match the glibc fork()
4447 // above.
4448 execve("/bin/sh", (char* const*)argv, environ);
4449
4450 // execve failed
4451 _exit(-1);
4452
4453 } else {
4454 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4455 // care about the actual exit code, for now.
4456
4457 int status;
4458
4459 // Wait for the child process to exit. This returns immediately if
4460 // the child has already exited. */
4461 while (waitpid(pid, &status, 0) < 0) {
4462 switch (errno) {
4463 case ECHILD: return 0;
4464 case EINTR: break;
4465 default: return -1;
4466 }
4467 }
4468
4469 if (WIFEXITED(status)) {
4470 // The child exited normally; get its exit code.
4471 return WEXITSTATUS(status);
4472 } else if (WIFSIGNALED(status)) {
4473 // The child exited because of a signal
4474 // The best value to return is 0x80 + signal number,
4475 // because that is what all Unix shells do, and because
4476 // it allows callers to distinguish between process exit and
4477 // process death by signal.
4478 return 0x80 + WTERMSIG(status);
4479 } else {
4480 // Unknown exit code; pass it through
4481 return status;
4482 }
4483 }
4484 }
4485
4486 // is_headless_jre()
4487 //
4488 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4489 // in order to report if we are running in a headless jre
4490 //
4491 // Since JDK8 xawt/libmawt.so was moved into the same directory
4492 // as libawt.so, and renamed libawt_xawt.so
4493 //
4494 bool os::is_headless_jre() {
4495 #ifdef __APPLE__
4496 // We no longer build headless-only on Mac OS X
4497 return false;
4498 #else
4499 struct stat statbuf;
4500 char buf[MAXPATHLEN];
4501 char libmawtpath[MAXPATHLEN];
4502 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4503 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4504 char *p;
4505
4506 // Get path to libjvm.so
4507 os::jvm_path(buf, sizeof(buf));
4508
4509 // Get rid of libjvm.so
4510 p = strrchr(buf, '/');
4511 if (p == NULL) {
4512 return false;
4513 } else {
4514 *p = '\0';
4515 }
4516
4517 // Get rid of client or server
4518 p = strrchr(buf, '/');
4519 if (p == NULL) {
4520 return false;
4521 } else {
4522 *p = '\0';
4523 }
4524
4525 // check xawt/libmawt.so
4526 strcpy(libmawtpath, buf);
4527 strcat(libmawtpath, xawtstr);
4528 if (::stat(libmawtpath, &statbuf) == 0) return false;
4529
4530 // check libawt_xawt.so
4531 strcpy(libmawtpath, buf);
4532 strcat(libmawtpath, new_xawtstr);
4533 if (::stat(libmawtpath, &statbuf) == 0) return false;
4534
4535 return true;
4536 #endif
4537 }
4538
4539 // Get the default path to the core file
4540 // Returns the length of the string
4541 int os::get_core_path(char* buffer, size_t bufferSize) {
4542 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
4543
4544 // Truncate if theoretical string was longer than bufferSize
4545 n = MIN2(n, (int)bufferSize);
4546
4547 return n;
4548 }
4549
4550 #ifndef PRODUCT
4551 void TestReserveMemorySpecial_test() {
4552 // No tests available for this platform
4553 }
4554 #endif
4555
4556 bool os::start_debugging(char *buf, int buflen) {
4557 int len = (int)strlen(buf);
4558 char *p = &buf[len];
4559
4560 jio_snprintf(p, buflen-len,
4561 "\n\n"
4562 "Do you want to debug the problem?\n\n"
4563 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
4564 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
4565 "Otherwise, press RETURN to abort...",
4566 os::current_process_id(), os::current_process_id(),
4567 os::current_thread_id(), os::current_thread_id());
4568
4569 bool yes = os::message_box("Unexpected Error", buf);
4570
4571 if (yes) {
4572 // yes, user asked VM to launch debugger
4573 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
4574 os::current_process_id(), os::current_process_id());
4575
4576 os::fork_and_exec(buf);
4577 yes = false;
4578 }
4579 return yes;
4580 }