1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_bsd.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_bsd.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_bsd.hpp"
40 #include "prims/jniFastGetField.hpp"
41 #include "prims/jvm.h"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/osThread.hpp"
52 #include "runtime/perfMemory.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/statSampler.hpp"
55 #include "runtime/stubRoutines.hpp"
56 #include "runtime/thread.inline.hpp"
57 #include "runtime/threadCritical.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/attachListener.hpp"
60 #include "services/memTracker.hpp"
61 #include "services/runtimeService.hpp"
62 #include "utilities/decoder.hpp"
63 #include "utilities/defaultStream.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/growableArray.hpp"
66 #include "utilities/vmError.hpp"
67
68 // put OS-includes here
69 # include <sys/types.h>
70 # include <sys/mman.h>
71 # include <sys/stat.h>
72 # include <sys/select.h>
73 # include <pthread.h>
74 # include <signal.h>
75 # include <errno.h>
76 # include <dlfcn.h>
77 # include <stdio.h>
78 # include <unistd.h>
79 # include <sys/resource.h>
80 # include <pthread.h>
81 # include <sys/stat.h>
82 # include <sys/time.h>
83 # include <sys/times.h>
84 # include <sys/utsname.h>
85 # include <sys/socket.h>
86 # include <sys/wait.h>
87 # include <time.h>
88 # include <pwd.h>
89 # include <poll.h>
90 # include <semaphore.h>
91 # include <fcntl.h>
92 # include <string.h>
93 # include <sys/param.h>
94 # include <sys/sysctl.h>
95 # include <sys/ipc.h>
96 # include <sys/shm.h>
97 #ifndef __APPLE__
98 # include <link.h>
99 #endif
100 # include <stdint.h>
101 # include <inttypes.h>
102 # include <sys/ioctl.h>
103 # include <sys/syscall.h>
104
105 #if defined(__FreeBSD__) || defined(__NetBSD__)
106 # include <elf.h>
107 #endif
108
109 #ifdef __APPLE__
110 # include <mach/mach.h> // semaphore_* API
111 # include <mach-o/dyld.h>
112 # include <sys/proc_info.h>
113 # include <objc/objc-auto.h>
114 #endif
115
116 #ifndef MAP_ANONYMOUS
117 #define MAP_ANONYMOUS MAP_ANON
118 #endif
119
120 #define MAX_PATH (2 * K)
121
122 // for timer info max values which include all bits
123 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
124
125 #define LARGEPAGES_BIT (1 << 6)
126 ////////////////////////////////////////////////////////////////////////////////
127 // global variables
128 julong os::Bsd::_physical_memory = 0;
129
130
131 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
132 pthread_t os::Bsd::_main_thread;
133 int os::Bsd::_page_size = -1;
134
135 static jlong initial_time_count=0;
136
137 static int clock_tics_per_sec = 100;
138
139 // For diagnostics to print a message once. see run_periodic_checks
140 static sigset_t check_signal_done;
141 static bool check_signals = true;
142
143 static pid_t _initial_pid = 0;
144
145 /* Signal number used to suspend/resume a thread */
146
147 /* do not use any signal number less than SIGSEGV, see 4355769 */
148 static int SR_signum = SIGUSR2;
149 sigset_t SR_sigset;
150
151
152 ////////////////////////////////////////////////////////////////////////////////
153 // utility functions
154
155 static int SR_initialize();
156 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
157
158 julong os::available_memory() {
159 return Bsd::available_memory();
160 }
161
162 // available here means free
163 julong os::Bsd::available_memory() {
164 uint64_t available = physical_memory() >> 2;
165 #ifdef __APPLE__
166 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
167 vm_statistics64_data_t vmstat;
168 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
169 (host_info64_t)&vmstat, &count);
170 assert(kerr == KERN_SUCCESS,
171 "host_statistics64 failed - check mach_host_self() and count");
172 if (kerr == KERN_SUCCESS) {
173 available = vmstat.free_count * os::vm_page_size();
174 }
175 #endif
176 return available;
177 }
178
179 julong os::physical_memory() {
180 return Bsd::physical_memory();
181 }
182
183 ////////////////////////////////////////////////////////////////////////////////
184 // environment support
185
186 bool os::getenv(const char* name, char* buf, int len) {
187 const char* val = ::getenv(name);
188 if (val != NULL && strlen(val) < (size_t)len) {
189 strcpy(buf, val);
190 return true;
191 }
192 if (len > 0) buf[0] = 0; // return a null string
193 return false;
194 }
195
196
197 // Return true if user is running as root.
198
199 bool os::have_special_privileges() {
200 static bool init = false;
201 static bool privileges = false;
202 if (!init) {
203 privileges = (getuid() != geteuid()) || (getgid() != getegid());
204 init = true;
205 }
206 return privileges;
207 }
208
209
210
211 // Cpu architecture string
212 #if defined(ZERO)
213 static char cpu_arch[] = ZERO_LIBARCH;
214 #elif defined(IA64)
215 static char cpu_arch[] = "ia64";
216 #elif defined(IA32)
217 static char cpu_arch[] = "i386";
218 #elif defined(AMD64)
219 static char cpu_arch[] = "amd64";
220 #elif defined(ARM)
221 static char cpu_arch[] = "arm";
222 #elif defined(PPC32)
223 static char cpu_arch[] = "ppc";
224 #elif defined(SPARC)
225 # ifdef _LP64
226 static char cpu_arch[] = "sparcv9";
227 # else
228 static char cpu_arch[] = "sparc";
229 # endif
230 #else
231 #error Add appropriate cpu_arch setting
232 #endif
233
234 // Compiler variant
235 #ifdef COMPILER2
236 #define COMPILER_VARIANT "server"
237 #else
238 #define COMPILER_VARIANT "client"
239 #endif
240
241
242 void os::Bsd::initialize_system_info() {
243 int mib[2];
244 size_t len;
245 int cpu_val;
246 julong mem_val;
247
248 /* get processors count via hw.ncpus sysctl */
249 mib[0] = CTL_HW;
250 mib[1] = HW_NCPU;
251 len = sizeof(cpu_val);
252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
253 assert(len == sizeof(cpu_val), "unexpected data size");
254 set_processor_count(cpu_val);
255 }
256 else {
257 set_processor_count(1); // fallback
258 }
259
260 /* get physical memory via hw.memsize sysctl (hw.memsize is used
261 * since it returns a 64 bit value)
262 */
263 mib[0] = CTL_HW;
264
265 #if defined (HW_MEMSIZE) // Apple
266 mib[1] = HW_MEMSIZE;
267 #elif defined(HW_PHYSMEM) // Most of BSD
268 mib[1] = HW_PHYSMEM;
269 #elif defined(HW_REALMEM) // Old FreeBSD
270 mib[1] = HW_REALMEM;
271 #else
272 #error No ways to get physmem
273 #endif
274
275 len = sizeof(mem_val);
276 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
277 assert(len == sizeof(mem_val), "unexpected data size");
278 _physical_memory = mem_val;
279 } else {
280 _physical_memory = 256*1024*1024; // fallback (XXXBSD?)
281 }
282
283 #ifdef __OpenBSD__
284 {
285 // limit _physical_memory memory view on OpenBSD since
286 // datasize rlimit restricts us anyway.
287 struct rlimit limits;
288 getrlimit(RLIMIT_DATA, &limits);
289 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
290 }
291 #endif
292 }
293
294 #ifdef __APPLE__
295 static const char *get_home() {
296 const char *home_dir = ::getenv("HOME");
297 if ((home_dir == NULL) || (*home_dir == '\0')) {
298 struct passwd *passwd_info = getpwuid(geteuid());
299 if (passwd_info != NULL) {
300 home_dir = passwd_info->pw_dir;
301 }
302 }
303
304 return home_dir;
305 }
306 #endif
307
308 void os::init_system_properties_values() {
309 // The next steps are taken in the product version:
310 //
311 // Obtain the JAVA_HOME value from the location of libjvm.so.
312 // This library should be located at:
313 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
314 //
315 // If "/jre/lib/" appears at the right place in the path, then we
316 // assume libjvm.so is installed in a JDK and we use this path.
317 //
318 // Otherwise exit with message: "Could not create the Java virtual machine."
319 //
320 // The following extra steps are taken in the debugging version:
321 //
322 // If "/jre/lib/" does NOT appear at the right place in the path
323 // instead of exit check for $JAVA_HOME environment variable.
324 //
325 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
326 // then we append a fake suffix "hotspot/libjvm.so" to this path so
327 // it looks like libjvm.so is installed there
328 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
329 //
330 // Otherwise exit.
331 //
332 // Important note: if the location of libjvm.so changes this
333 // code needs to be changed accordingly.
334
335 // See ld(1):
336 // The linker uses the following search paths to locate required
337 // shared libraries:
338 // 1: ...
339 // ...
340 // 7: The default directories, normally /lib and /usr/lib.
341 #ifndef DEFAULT_LIBPATH
342 #define DEFAULT_LIBPATH "/lib:/usr/lib"
343 #endif
344
345 // Base path of extensions installed on the system.
346 #define SYS_EXT_DIR "/usr/java/packages"
347 #define EXTENSIONS_DIR "/lib/ext"
348 #define ENDORSED_DIR "/lib/endorsed"
349
350 #ifndef __APPLE__
351
352 // Buffer that fits several sprintfs.
353 // Note that the space for the colon and the trailing null are provided
354 // by the nulls included by the sizeof operator.
355 const size_t bufsize =
356 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
357 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
358 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
359 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
360
361 // sysclasspath, java_home, dll_dir
362 {
363 char *pslash;
364 os::jvm_path(buf, bufsize);
365
366 // Found the full path to libjvm.so.
367 // Now cut the path to <java_home>/jre if we can.
368 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
369 pslash = strrchr(buf, '/');
370 if (pslash != NULL) {
371 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
372 }
373 Arguments::set_dll_dir(buf);
374
375 if (pslash != NULL) {
376 pslash = strrchr(buf, '/');
377 if (pslash != NULL) {
378 *pslash = '\0'; // Get rid of /<arch>.
379 pslash = strrchr(buf, '/');
380 if (pslash != NULL) {
381 *pslash = '\0'; // Get rid of /lib.
382 }
383 }
384 }
385 Arguments::set_java_home(buf);
386 set_boot_path('/', ':');
387 }
388
389 // Where to look for native libraries.
390 //
391 // Note: Due to a legacy implementation, most of the library path
392 // is set in the launcher. This was to accomodate linking restrictions
393 // on legacy Bsd implementations (which are no longer supported).
394 // Eventually, all the library path setting will be done here.
395 //
396 // However, to prevent the proliferation of improperly built native
397 // libraries, the new path component /usr/java/packages is added here.
398 // Eventually, all the library path setting will be done here.
399 {
400 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
401 // should always exist (until the legacy problem cited above is
402 // addressed).
403 const char *v = ::getenv("LD_LIBRARY_PATH");
404 const char *v_colon = ":";
405 if (v == NULL) { v = ""; v_colon = ""; }
406 // That's +1 for the colon and +1 for the trailing '\0'.
407 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
408 strlen(v) + 1 +
409 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
410 mtInternal);
411 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
412 Arguments::set_library_path(ld_library_path);
413 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal);
414 }
415
416 // Extensions directories.
417 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
418 Arguments::set_ext_dirs(buf);
419
420 // Endorsed standards default directory.
421 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
422 Arguments::set_endorsed_dirs(buf);
423
424 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
425
426 #else // __APPLE__
427
428 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
429 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
430
431 const char *user_home_dir = get_home();
432 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
433 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
434 sizeof(SYS_EXTENSIONS_DIRS);
435
436 // Buffer that fits several sprintfs.
437 // Note that the space for the colon and the trailing null are provided
438 // by the nulls included by the sizeof operator.
439 const size_t bufsize =
440 MAX3((size_t)MAXPATHLEN, // for dll_dir & friends.
441 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size, // extensions dir
442 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
443 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
444
445 // sysclasspath, java_home, dll_dir
446 {
447 char *pslash;
448 os::jvm_path(buf, bufsize);
449
450 // Found the full path to libjvm.so.
451 // Now cut the path to <java_home>/jre if we can.
452 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
453 pslash = strrchr(buf, '/');
454 if (pslash != NULL) {
455 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
456 }
457 Arguments::set_dll_dir(buf);
458
459 if (pslash != NULL) {
460 pslash = strrchr(buf, '/');
461 if (pslash != NULL) {
462 *pslash = '\0'; // Get rid of /lib.
463 }
464 }
465 Arguments::set_java_home(buf);
466 set_boot_path('/', ':');
467 }
468
469 // Where to look for native libraries.
470 //
471 // Note: Due to a legacy implementation, most of the library path
472 // is set in the launcher. This was to accomodate linking restrictions
473 // on legacy Bsd implementations (which are no longer supported).
474 // Eventually, all the library path setting will be done here.
475 //
476 // However, to prevent the proliferation of improperly built native
477 // libraries, the new path component /usr/java/packages is added here.
478 // Eventually, all the library path setting will be done here.
479 {
480 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
481 // should always exist (until the legacy problem cited above is
482 // addressed).
483 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
484 // can specify a directory inside an app wrapper
485 const char *l = ::getenv("JAVA_LIBRARY_PATH");
486 const char *l_colon = ":";
487 if (l == NULL) { l = ""; l_colon = ""; }
488
489 const char *v = ::getenv("DYLD_LIBRARY_PATH");
490 const char *v_colon = ":";
491 if (v == NULL) { v = ""; v_colon = ""; }
492
493 // Apple's Java6 has "." at the beginning of java.library.path.
494 // OpenJDK on Windows has "." at the end of java.library.path.
495 // OpenJDK on Linux and Solaris don't have "." in java.library.path
496 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
497 // "." is appended to the end of java.library.path. Yes, this
498 // could cause a change in behavior, but Apple's Java6 behavior
499 // can be achieved by putting "." at the beginning of the
500 // JAVA_LIBRARY_PATH environment variable.
501 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
502 strlen(v) + 1 + strlen(l) + 1 +
503 system_ext_size + 3,
504 mtInternal);
505 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
506 v, v_colon, l, l_colon, user_home_dir);
507 Arguments::set_library_path(ld_library_path);
508 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal);
509 }
510
511 // Extensions directories.
512 //
513 // Note that the space for the colon and the trailing null are provided
514 // by the nulls included by the sizeof operator (so actually one byte more
515 // than necessary is allocated).
516 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
517 user_home_dir, Arguments::get_java_home());
518 Arguments::set_ext_dirs(buf);
519
520 // Endorsed standards default directory.
521 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
522 Arguments::set_endorsed_dirs(buf);
523
524 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
525
526 #undef SYS_EXTENSIONS_DIR
527 #undef SYS_EXTENSIONS_DIRS
528
529 #endif // __APPLE__
530
531 #undef SYS_EXT_DIR
532 #undef EXTENSIONS_DIR
533 #undef ENDORSED_DIR
534 }
535
536 ////////////////////////////////////////////////////////////////////////////////
537 // breakpoint support
538
539 void os::breakpoint() {
540 BREAKPOINT;
541 }
542
543 extern "C" void breakpoint() {
544 // use debugger to set breakpoint here
545 }
546
547 ////////////////////////////////////////////////////////////////////////////////
548 // signal support
549
550 debug_only(static bool signal_sets_initialized = false);
551 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
552
553 bool os::Bsd::is_sig_ignored(int sig) {
554 struct sigaction oact;
555 sigaction(sig, (struct sigaction*)NULL, &oact);
556 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
557 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
558 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
559 return true;
560 else
561 return false;
562 }
563
564 void os::Bsd::signal_sets_init() {
565 // Should also have an assertion stating we are still single-threaded.
566 assert(!signal_sets_initialized, "Already initialized");
567 // Fill in signals that are necessarily unblocked for all threads in
568 // the VM. Currently, we unblock the following signals:
569 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
570 // by -Xrs (=ReduceSignalUsage));
571 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
572 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
573 // the dispositions or masks wrt these signals.
574 // Programs embedding the VM that want to use the above signals for their
575 // own purposes must, at this time, use the "-Xrs" option to prevent
576 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
577 // (See bug 4345157, and other related bugs).
578 // In reality, though, unblocking these signals is really a nop, since
579 // these signals are not blocked by default.
580 sigemptyset(&unblocked_sigs);
581 sigemptyset(&allowdebug_blocked_sigs);
582 sigaddset(&unblocked_sigs, SIGILL);
583 sigaddset(&unblocked_sigs, SIGSEGV);
584 sigaddset(&unblocked_sigs, SIGBUS);
585 sigaddset(&unblocked_sigs, SIGFPE);
586 sigaddset(&unblocked_sigs, SR_signum);
587
588 if (!ReduceSignalUsage) {
589 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
590 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
591 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
592 }
593 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
594 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
595 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
596 }
597 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
598 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
599 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
600 }
601 }
602 // Fill in signals that are blocked by all but the VM thread.
603 sigemptyset(&vm_sigs);
604 if (!ReduceSignalUsage)
605 sigaddset(&vm_sigs, BREAK_SIGNAL);
606 debug_only(signal_sets_initialized = true);
607
608 }
609
610 // These are signals that are unblocked while a thread is running Java.
611 // (For some reason, they get blocked by default.)
612 sigset_t* os::Bsd::unblocked_signals() {
613 assert(signal_sets_initialized, "Not initialized");
614 return &unblocked_sigs;
615 }
616
617 // These are the signals that are blocked while a (non-VM) thread is
618 // running Java. Only the VM thread handles these signals.
619 sigset_t* os::Bsd::vm_signals() {
620 assert(signal_sets_initialized, "Not initialized");
621 return &vm_sigs;
622 }
623
624 // These are signals that are blocked during cond_wait to allow debugger in
625 sigset_t* os::Bsd::allowdebug_blocked_signals() {
626 assert(signal_sets_initialized, "Not initialized");
627 return &allowdebug_blocked_sigs;
628 }
629
630 void os::Bsd::hotspot_sigmask(Thread* thread) {
631
632 //Save caller's signal mask before setting VM signal mask
633 sigset_t caller_sigmask;
634 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
635
636 OSThread* osthread = thread->osthread();
637 osthread->set_caller_sigmask(caller_sigmask);
638
639 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
640
641 if (!ReduceSignalUsage) {
642 if (thread->is_VM_thread()) {
643 // Only the VM thread handles BREAK_SIGNAL ...
644 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
645 } else {
646 // ... all other threads block BREAK_SIGNAL
647 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
648 }
649 }
650 }
651
652
653 //////////////////////////////////////////////////////////////////////////////
654 // create new thread
655
656 // check if it's safe to start a new thread
657 static bool _thread_safety_check(Thread* thread) {
658 return true;
659 }
660
661 #ifdef __APPLE__
662 // library handle for calling objc_registerThreadWithCollector()
663 // without static linking to the libobjc library
664 #define OBJC_LIB "/usr/lib/libobjc.dylib"
665 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
666 typedef void (*objc_registerThreadWithCollector_t)();
667 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
668 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
669 #endif
670
671 #ifdef __APPLE__
672 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
673 // Additional thread_id used to correlate threads in SA
674 thread_identifier_info_data_t m_ident_info;
675 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
676
677 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
678 (thread_info_t) &m_ident_info, &count);
679
680 return m_ident_info.thread_id;
681 }
682 #endif
683
684 // Thread start routine for all newly created threads
685 static void *java_start(Thread *thread) {
686 // Try to randomize the cache line index of hot stack frames.
687 // This helps when threads of the same stack traces evict each other's
688 // cache lines. The threads can be either from the same JVM instance, or
689 // from different JVM instances. The benefit is especially true for
690 // processors with hyperthreading technology.
691 static int counter = 0;
692 int pid = os::current_process_id();
693 alloca(((pid ^ counter++) & 7) * 128);
694
695 ThreadLocalStorage::set_thread(thread);
696
697 OSThread* osthread = thread->osthread();
698 Monitor* sync = osthread->startThread_lock();
699
700 // non floating stack BsdThreads needs extra check, see above
701 if (!_thread_safety_check(thread)) {
702 // notify parent thread
703 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
704 osthread->set_state(ZOMBIE);
705 sync->notify_all();
706 return NULL;
707 }
708
709 osthread->set_thread_id(os::Bsd::gettid());
710
711 #ifdef __APPLE__
712 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
713 guarantee(unique_thread_id != 0, "unique thread id was not found");
714 osthread->set_unique_thread_id(unique_thread_id);
715 #endif
716 // initialize signal mask for this thread
717 os::Bsd::hotspot_sigmask(thread);
718
719 // initialize floating point control register
720 os::Bsd::init_thread_fpu_state();
721
722 #ifdef __APPLE__
723 // register thread with objc gc
724 if (objc_registerThreadWithCollectorFunction != NULL) {
725 objc_registerThreadWithCollectorFunction();
726 }
727 #endif
728
729 // handshaking with parent thread
730 {
731 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
732
733 // notify parent thread
734 osthread->set_state(INITIALIZED);
735 sync->notify_all();
736
737 // wait until os::start_thread()
738 while (osthread->get_state() == INITIALIZED) {
739 sync->wait(Mutex::_no_safepoint_check_flag);
740 }
741 }
742
743 // call one more level start routine
744 thread->run();
745
746 return 0;
747 }
748
749 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
750 assert(thread->osthread() == NULL, "caller responsible");
751
752 // Allocate the OSThread object
753 OSThread* osthread = new OSThread(NULL, NULL);
754 if (osthread == NULL) {
755 return false;
756 }
757
758 // set the correct thread state
759 osthread->set_thread_type(thr_type);
760
761 // Initial state is ALLOCATED but not INITIALIZED
762 osthread->set_state(ALLOCATED);
763
764 thread->set_osthread(osthread);
765
766 // init thread attributes
767 pthread_attr_t attr;
768 pthread_attr_init(&attr);
769 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
770
771 // stack size
772 if (os::Bsd::supports_variable_stack_size()) {
773 // calculate stack size if it's not specified by caller
774 if (stack_size == 0) {
775 stack_size = os::Bsd::default_stack_size(thr_type);
776
777 switch (thr_type) {
778 case os::java_thread:
779 // Java threads use ThreadStackSize which default value can be
780 // changed with the flag -Xss
781 assert (JavaThread::stack_size_at_create() > 0, "this should be set");
782 stack_size = JavaThread::stack_size_at_create();
783 break;
784 case os::compiler_thread:
785 if (CompilerThreadStackSize > 0) {
786 stack_size = (size_t)(CompilerThreadStackSize * K);
787 break;
788 } // else fall through:
789 // use VMThreadStackSize if CompilerThreadStackSize is not defined
790 case os::vm_thread:
791 case os::pgc_thread:
792 case os::cgc_thread:
793 case os::watcher_thread:
794 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
795 break;
796 }
797 }
798
799 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
800 pthread_attr_setstacksize(&attr, stack_size);
801 } else {
802 // let pthread_create() pick the default value.
803 }
804
805 ThreadState state;
806
807 {
808 pthread_t tid;
809 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
810
811 pthread_attr_destroy(&attr);
812
813 if (ret != 0) {
814 if (PrintMiscellaneous && (Verbose || WizardMode)) {
815 perror("pthread_create()");
816 }
817 // Need to clean up stuff we've allocated so far
818 thread->set_osthread(NULL);
819 delete osthread;
820 return false;
821 }
822
823 // Store pthread info into the OSThread
824 osthread->set_pthread_id(tid);
825
826 // Wait until child thread is either initialized or aborted
827 {
828 Monitor* sync_with_child = osthread->startThread_lock();
829 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
830 while ((state = osthread->get_state()) == ALLOCATED) {
831 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
832 }
833 }
834
835 }
836
837 // Aborted due to thread limit being reached
838 if (state == ZOMBIE) {
839 thread->set_osthread(NULL);
840 delete osthread;
841 return false;
842 }
843
844 // The thread is returned suspended (in state INITIALIZED),
845 // and is started higher up in the call chain
846 assert(state == INITIALIZED, "race condition");
847 return true;
848 }
849
850 /////////////////////////////////////////////////////////////////////////////
851 // attach existing thread
852
853 // bootstrap the main thread
854 bool os::create_main_thread(JavaThread* thread) {
855 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
856 return create_attached_thread(thread);
857 }
858
859 bool os::create_attached_thread(JavaThread* thread) {
860 #ifdef ASSERT
861 thread->verify_not_published();
862 #endif
863
864 // Allocate the OSThread object
865 OSThread* osthread = new OSThread(NULL, NULL);
866
867 if (osthread == NULL) {
868 return false;
869 }
870
871 osthread->set_thread_id(os::Bsd::gettid());
872
873 // Store pthread info into the OSThread
874 #ifdef __APPLE__
875 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
876 guarantee(unique_thread_id != 0, "just checking");
877 osthread->set_unique_thread_id(unique_thread_id);
878 #endif
879 osthread->set_pthread_id(::pthread_self());
880
881 // initialize floating point control register
882 os::Bsd::init_thread_fpu_state();
883
884 // Initial thread state is RUNNABLE
885 osthread->set_state(RUNNABLE);
886
887 thread->set_osthread(osthread);
888
889 // initialize signal mask for this thread
890 // and save the caller's signal mask
891 os::Bsd::hotspot_sigmask(thread);
892
893 return true;
894 }
895
896 void os::pd_start_thread(Thread* thread) {
897 OSThread * osthread = thread->osthread();
898 assert(osthread->get_state() != INITIALIZED, "just checking");
899 Monitor* sync_with_child = osthread->startThread_lock();
900 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
901 sync_with_child->notify();
902 }
903
904 // Free Bsd resources related to the OSThread
905 void os::free_thread(OSThread* osthread) {
906 assert(osthread != NULL, "osthread not set");
907
908 if (Thread::current()->osthread() == osthread) {
909 // Restore caller's signal mask
910 sigset_t sigmask = osthread->caller_sigmask();
911 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
912 }
913
914 delete osthread;
915 }
916
917 //////////////////////////////////////////////////////////////////////////////
918 // thread local storage
919
920 // Restore the thread pointer if the destructor is called. This is in case
921 // someone from JNI code sets up a destructor with pthread_key_create to run
922 // detachCurrentThread on thread death. Unless we restore the thread pointer we
923 // will hang or crash. When detachCurrentThread is called the key will be set
924 // to null and we will not be called again. If detachCurrentThread is never
925 // called we could loop forever depending on the pthread implementation.
926 static void restore_thread_pointer(void* p) {
927 Thread* thread = (Thread*) p;
928 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
929 }
930
931 int os::allocate_thread_local_storage() {
932 pthread_key_t key;
933 int rslt = pthread_key_create(&key, restore_thread_pointer);
934 assert(rslt == 0, "cannot allocate thread local storage");
935 return (int)key;
936 }
937
938 // Note: This is currently not used by VM, as we don't destroy TLS key
939 // on VM exit.
940 void os::free_thread_local_storage(int index) {
941 int rslt = pthread_key_delete((pthread_key_t)index);
942 assert(rslt == 0, "invalid index");
943 }
944
945 void os::thread_local_storage_at_put(int index, void* value) {
946 int rslt = pthread_setspecific((pthread_key_t)index, value);
947 assert(rslt == 0, "pthread_setspecific failed");
948 }
949
950 extern "C" Thread* get_thread() {
951 return ThreadLocalStorage::thread();
952 }
953
954
955 ////////////////////////////////////////////////////////////////////////////////
956 // time support
957
958 // Time since start-up in seconds to a fine granularity.
959 // Used by VMSelfDestructTimer and the MemProfiler.
960 double os::elapsedTime() {
961
962 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
963 }
964
965 jlong os::elapsed_counter() {
966 return javaTimeNanos() - initial_time_count;
967 }
968
969 jlong os::elapsed_frequency() {
970 return NANOSECS_PER_SEC; // nanosecond resolution
971 }
972
973 bool os::supports_vtime() { return true; }
974 bool os::enable_vtime() { return false; }
975 bool os::vtime_enabled() { return false; }
976
977 double os::elapsedVTime() {
978 // better than nothing, but not much
979 return elapsedTime();
980 }
981
982 jlong os::javaTimeMillis() {
983 timeval time;
984 int status = gettimeofday(&time, NULL);
985 assert(status != -1, "bsd error");
986 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
987 }
988
989 #ifndef CLOCK_MONOTONIC
990 #define CLOCK_MONOTONIC (1)
991 #endif
992
993 #ifdef __APPLE__
994 void os::Bsd::clock_init() {
995 // XXXDARWIN: Investigate replacement monotonic clock
996 }
997 #else
998 void os::Bsd::clock_init() {
999 struct timespec res;
1000 struct timespec tp;
1001 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
1002 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
1003 // yes, monotonic clock is supported
1004 _clock_gettime = ::clock_gettime;
1005 }
1006 }
1007 #endif
1008
1009
1010 jlong os::javaTimeNanos() {
1011 if (Bsd::supports_monotonic_clock()) {
1012 struct timespec tp;
1013 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp);
1014 assert(status == 0, "gettime error");
1015 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
1016 return result;
1017 } else {
1018 timeval time;
1019 int status = gettimeofday(&time, NULL);
1020 assert(status != -1, "bsd error");
1021 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1022 return 1000 * usecs;
1023 }
1024 }
1025
1026 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1027 if (Bsd::supports_monotonic_clock()) {
1028 info_ptr->max_value = ALL_64_BITS;
1029
1030 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1031 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1032 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1033 } else {
1034 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1035 info_ptr->max_value = ALL_64_BITS;
1036
1037 // gettimeofday is a real time clock so it skips
1038 info_ptr->may_skip_backward = true;
1039 info_ptr->may_skip_forward = true;
1040 }
1041
1042 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1043 }
1044
1045 // Return the real, user, and system times in seconds from an
1046 // arbitrary fixed point in the past.
1047 bool os::getTimesSecs(double* process_real_time,
1048 double* process_user_time,
1049 double* process_system_time) {
1050 struct tms ticks;
1051 clock_t real_ticks = times(&ticks);
1052
1053 if (real_ticks == (clock_t) (-1)) {
1054 return false;
1055 } else {
1056 double ticks_per_second = (double) clock_tics_per_sec;
1057 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1058 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1059 *process_real_time = ((double) real_ticks) / ticks_per_second;
1060
1061 return true;
1062 }
1063 }
1064
1065
1066 char * os::local_time_string(char *buf, size_t buflen) {
1067 struct tm t;
1068 time_t long_time;
1069 time(&long_time);
1070 localtime_r(&long_time, &t);
1071 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1072 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1073 t.tm_hour, t.tm_min, t.tm_sec);
1074 return buf;
1075 }
1076
1077 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1078 return localtime_r(clock, res);
1079 }
1080
1081 ////////////////////////////////////////////////////////////////////////////////
1082 // runtime exit support
1083
1084 // Note: os::shutdown() might be called very early during initialization, or
1085 // called from signal handler. Before adding something to os::shutdown(), make
1086 // sure it is async-safe and can handle partially initialized VM.
1087 void os::shutdown() {
1088
1089 // allow PerfMemory to attempt cleanup of any persistent resources
1090 perfMemory_exit();
1091
1092 // needs to remove object in file system
1093 AttachListener::abort();
1094
1095 // flush buffered output, finish log files
1096 ostream_abort();
1097
1098 // Check for abort hook
1099 abort_hook_t abort_hook = Arguments::abort_hook();
1100 if (abort_hook != NULL) {
1101 abort_hook();
1102 }
1103
1104 }
1105
1106 // Note: os::abort() might be called very early during initialization, or
1107 // called from signal handler. Before adding something to os::abort(), make
1108 // sure it is async-safe and can handle partially initialized VM.
1109 void os::abort(bool dump_core) {
1110 os::shutdown();
1111 if (dump_core) {
1112 #ifndef PRODUCT
1113 fdStream out(defaultStream::output_fd());
1114 out.print_raw("Current thread is ");
1115 char buf[16];
1116 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1117 out.print_raw_cr(buf);
1118 out.print_raw_cr("Dumping core ...");
1119 #endif
1120 ::abort(); // dump core
1121 }
1122
1123 ::exit(1);
1124 }
1125
1126 // Die immediately, no exit hook, no abort hook, no cleanup.
1127 void os::die() {
1128 // _exit() on BsdThreads only kills current thread
1129 ::abort();
1130 }
1131
1132 // unused on bsd for now.
1133 void os::set_error_file(const char *logfile) {}
1134
1135
1136 // This method is a copy of JDK's sysGetLastErrorString
1137 // from src/solaris/hpi/src/system_md.c
1138
1139 size_t os::lasterror(char *buf, size_t len) {
1140
1141 if (errno == 0) return 0;
1142
1143 const char *s = ::strerror(errno);
1144 size_t n = ::strlen(s);
1145 if (n >= len) {
1146 n = len - 1;
1147 }
1148 ::strncpy(buf, s, n);
1149 buf[n] = '\0';
1150 return n;
1151 }
1152
1153 // Information of current thread in variety of formats
1154 pid_t os::Bsd::gettid() {
1155 int retval = -1;
1156
1157 #ifdef __APPLE__ //XNU kernel
1158 // despite the fact mach port is actually not a thread id use it
1159 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1160 retval = ::pthread_mach_thread_np(::pthread_self());
1161 guarantee(retval != 0, "just checking");
1162 return retval;
1163
1164 #elif __FreeBSD__
1165 retval = syscall(SYS_thr_self);
1166 #elif __OpenBSD__
1167 retval = syscall(SYS_getthrid);
1168 #elif __NetBSD__
1169 retval = (pid_t) syscall(SYS__lwp_self);
1170 #endif
1171
1172 if (retval == -1) {
1173 return getpid();
1174 }
1175 }
1176
1177 intx os::current_thread_id() {
1178 #ifdef __APPLE__
1179 return (intx)::pthread_mach_thread_np(::pthread_self());
1180 #else
1181 return (intx)::pthread_self();
1182 #endif
1183 }
1184
1185 int os::current_process_id() {
1186
1187 // Under the old bsd thread library, bsd gives each thread
1188 // its own process id. Because of this each thread will return
1189 // a different pid if this method were to return the result
1190 // of getpid(2). Bsd provides no api that returns the pid
1191 // of the launcher thread for the vm. This implementation
1192 // returns a unique pid, the pid of the launcher thread
1193 // that starts the vm 'process'.
1194
1195 // Under the NPTL, getpid() returns the same pid as the
1196 // launcher thread rather than a unique pid per thread.
1197 // Use gettid() if you want the old pre NPTL behaviour.
1198
1199 // if you are looking for the result of a call to getpid() that
1200 // returns a unique pid for the calling thread, then look at the
1201 // OSThread::thread_id() method in osThread_bsd.hpp file
1202
1203 return (int)(_initial_pid ? _initial_pid : getpid());
1204 }
1205
1206 // DLL functions
1207
1208 #define JNI_LIB_PREFIX "lib"
1209 #ifdef __APPLE__
1210 #define JNI_LIB_SUFFIX ".dylib"
1211 #else
1212 #define JNI_LIB_SUFFIX ".so"
1213 #endif
1214
1215 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1216
1217 // This must be hard coded because it's the system's temporary
1218 // directory not the java application's temp directory, ala java.io.tmpdir.
1219 #ifdef __APPLE__
1220 // macosx has a secure per-user temporary directory
1221 char temp_path_storage[PATH_MAX];
1222 const char* os::get_temp_directory() {
1223 static char *temp_path = NULL;
1224 if (temp_path == NULL) {
1225 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1226 if (pathSize == 0 || pathSize > PATH_MAX) {
1227 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1228 }
1229 temp_path = temp_path_storage;
1230 }
1231 return temp_path;
1232 }
1233 #else /* __APPLE__ */
1234 const char* os::get_temp_directory() { return "/tmp"; }
1235 #endif /* __APPLE__ */
1236
1237 static bool file_exists(const char* filename) {
1238 struct stat statbuf;
1239 if (filename == NULL || strlen(filename) == 0) {
1240 return false;
1241 }
1242 return os::stat(filename, &statbuf) == 0;
1243 }
1244
1245 bool os::dll_build_name(char* buffer, size_t buflen,
1246 const char* pname, const char* fname) {
1247 bool retval = false;
1248 // Copied from libhpi
1249 const size_t pnamelen = pname ? strlen(pname) : 0;
1250
1251 // Return error on buffer overflow.
1252 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1253 return retval;
1254 }
1255
1256 if (pnamelen == 0) {
1257 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1258 retval = true;
1259 } else if (strchr(pname, *os::path_separator()) != NULL) {
1260 int n;
1261 char** pelements = split_path(pname, &n);
1262 if (pelements == NULL) {
1263 return false;
1264 }
1265 for (int i = 0 ; i < n ; i++) {
1266 // Really shouldn't be NULL, but check can't hurt
1267 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1268 continue; // skip the empty path values
1269 }
1270 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1271 pelements[i], fname);
1272 if (file_exists(buffer)) {
1273 retval = true;
1274 break;
1275 }
1276 }
1277 // release the storage
1278 for (int i = 0 ; i < n ; i++) {
1279 if (pelements[i] != NULL) {
1280 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1281 }
1282 }
1283 if (pelements != NULL) {
1284 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1285 }
1286 } else {
1287 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1288 retval = true;
1289 }
1290 return retval;
1291 }
1292
1293 // check if addr is inside libjvm.so
1294 bool os::address_is_in_vm(address addr) {
1295 static address libjvm_base_addr;
1296 Dl_info dlinfo;
1297
1298 if (libjvm_base_addr == NULL) {
1299 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1300 libjvm_base_addr = (address)dlinfo.dli_fbase;
1301 }
1302 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1303 }
1304
1305 if (dladdr((void *)addr, &dlinfo) != 0) {
1306 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1307 }
1308
1309 return false;
1310 }
1311
1312
1313 #define MACH_MAXSYMLEN 256
1314
1315 bool os::dll_address_to_function_name(address addr, char *buf,
1316 int buflen, int *offset) {
1317 // buf is not optional, but offset is optional
1318 assert(buf != NULL, "sanity check");
1319
1320 Dl_info dlinfo;
1321 char localbuf[MACH_MAXSYMLEN];
1322
1323 if (dladdr((void*)addr, &dlinfo) != 0) {
1324 // see if we have a matching symbol
1325 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1326 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1327 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1328 }
1329 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1330 return true;
1331 }
1332 // no matching symbol so try for just file info
1333 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1334 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1335 buf, buflen, offset, dlinfo.dli_fname)) {
1336 return true;
1337 }
1338 }
1339
1340 // Handle non-dynamic manually:
1341 if (dlinfo.dli_fbase != NULL &&
1342 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1343 dlinfo.dli_fbase)) {
1344 if (!Decoder::demangle(localbuf, buf, buflen)) {
1345 jio_snprintf(buf, buflen, "%s", localbuf);
1346 }
1347 return true;
1348 }
1349 }
1350 buf[0] = '\0';
1351 if (offset != NULL) *offset = -1;
1352 return false;
1353 }
1354
1355 // ported from solaris version
1356 bool os::dll_address_to_library_name(address addr, char* buf,
1357 int buflen, int* offset) {
1358 // buf is not optional, but offset is optional
1359 assert(buf != NULL, "sanity check");
1360
1361 Dl_info dlinfo;
1362
1363 if (dladdr((void*)addr, &dlinfo) != 0) {
1364 if (dlinfo.dli_fname != NULL) {
1365 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1366 }
1367 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1368 *offset = addr - (address)dlinfo.dli_fbase;
1369 }
1370 return true;
1371 }
1372
1373 buf[0] = '\0';
1374 if (offset) *offset = -1;
1375 return false;
1376 }
1377
1378 // Loads .dll/.so and
1379 // in case of error it checks if .dll/.so was built for the
1380 // same architecture as Hotspot is running on
1381
1382 #ifdef __APPLE__
1383 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1384 void * result= ::dlopen(filename, RTLD_LAZY);
1385 if (result != NULL) {
1386 // Successful loading
1387 return result;
1388 }
1389
1390 // Read system error message into ebuf
1391 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1392 ebuf[ebuflen-1]='\0';
1393
1394 return NULL;
1395 }
1396 #else
1397 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1398 {
1399 void * result= ::dlopen(filename, RTLD_LAZY);
1400 if (result != NULL) {
1401 // Successful loading
1402 return result;
1403 }
1404
1405 Elf32_Ehdr elf_head;
1406
1407 // Read system error message into ebuf
1408 // It may or may not be overwritten below
1409 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1410 ebuf[ebuflen-1]='\0';
1411 int diag_msg_max_length=ebuflen-strlen(ebuf);
1412 char* diag_msg_buf=ebuf+strlen(ebuf);
1413
1414 if (diag_msg_max_length==0) {
1415 // No more space in ebuf for additional diagnostics message
1416 return NULL;
1417 }
1418
1419
1420 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1421
1422 if (file_descriptor < 0) {
1423 // Can't open library, report dlerror() message
1424 return NULL;
1425 }
1426
1427 bool failed_to_read_elf_head=
1428 (sizeof(elf_head)!=
1429 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1430
1431 ::close(file_descriptor);
1432 if (failed_to_read_elf_head) {
1433 // file i/o error - report dlerror() msg
1434 return NULL;
1435 }
1436
1437 typedef struct {
1438 Elf32_Half code; // Actual value as defined in elf.h
1439 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1440 char elf_class; // 32 or 64 bit
1441 char endianess; // MSB or LSB
1442 char* name; // String representation
1443 } arch_t;
1444
1445 #ifndef EM_486
1446 #define EM_486 6 /* Intel 80486 */
1447 #endif
1448
1449 #ifndef EM_MIPS_RS3_LE
1450 #define EM_MIPS_RS3_LE 10 /* MIPS */
1451 #endif
1452
1453 #ifndef EM_PPC64
1454 #define EM_PPC64 21 /* PowerPC64 */
1455 #endif
1456
1457 #ifndef EM_S390
1458 #define EM_S390 22 /* IBM System/390 */
1459 #endif
1460
1461 #ifndef EM_IA_64
1462 #define EM_IA_64 50 /* HP/Intel IA-64 */
1463 #endif
1464
1465 #ifndef EM_X86_64
1466 #define EM_X86_64 62 /* AMD x86-64 */
1467 #endif
1468
1469 static const arch_t arch_array[]={
1470 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1471 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1472 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1473 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1474 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1475 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1476 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1477 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1478 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1479 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1480 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1481 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1482 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1483 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1484 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1485 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1486 };
1487
1488 #if (defined IA32)
1489 static Elf32_Half running_arch_code=EM_386;
1490 #elif (defined AMD64)
1491 static Elf32_Half running_arch_code=EM_X86_64;
1492 #elif (defined IA64)
1493 static Elf32_Half running_arch_code=EM_IA_64;
1494 #elif (defined __sparc) && (defined _LP64)
1495 static Elf32_Half running_arch_code=EM_SPARCV9;
1496 #elif (defined __sparc) && (!defined _LP64)
1497 static Elf32_Half running_arch_code=EM_SPARC;
1498 #elif (defined __powerpc64__)
1499 static Elf32_Half running_arch_code=EM_PPC64;
1500 #elif (defined __powerpc__)
1501 static Elf32_Half running_arch_code=EM_PPC;
1502 #elif (defined ARM)
1503 static Elf32_Half running_arch_code=EM_ARM;
1504 #elif (defined S390)
1505 static Elf32_Half running_arch_code=EM_S390;
1506 #elif (defined ALPHA)
1507 static Elf32_Half running_arch_code=EM_ALPHA;
1508 #elif (defined MIPSEL)
1509 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1510 #elif (defined PARISC)
1511 static Elf32_Half running_arch_code=EM_PARISC;
1512 #elif (defined MIPS)
1513 static Elf32_Half running_arch_code=EM_MIPS;
1514 #elif (defined M68K)
1515 static Elf32_Half running_arch_code=EM_68K;
1516 #else
1517 #error Method os::dll_load requires that one of following is defined:\
1518 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1519 #endif
1520
1521 // Identify compatability class for VM's architecture and library's architecture
1522 // Obtain string descriptions for architectures
1523
1524 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1525 int running_arch_index=-1;
1526
1527 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
1528 if (running_arch_code == arch_array[i].code) {
1529 running_arch_index = i;
1530 }
1531 if (lib_arch.code == arch_array[i].code) {
1532 lib_arch.compat_class = arch_array[i].compat_class;
1533 lib_arch.name = arch_array[i].name;
1534 }
1535 }
1536
1537 assert(running_arch_index != -1,
1538 "Didn't find running architecture code (running_arch_code) in arch_array");
1539 if (running_arch_index == -1) {
1540 // Even though running architecture detection failed
1541 // we may still continue with reporting dlerror() message
1542 return NULL;
1543 }
1544
1545 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1546 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1547 return NULL;
1548 }
1549
1550 #ifndef S390
1551 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1552 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1553 return NULL;
1554 }
1555 #endif // !S390
1556
1557 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1558 if ( lib_arch.name!=NULL ) {
1559 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1560 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1561 lib_arch.name, arch_array[running_arch_index].name);
1562 } else {
1563 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1564 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1565 lib_arch.code,
1566 arch_array[running_arch_index].name);
1567 }
1568 }
1569
1570 return NULL;
1571 }
1572 #endif /* !__APPLE__ */
1573
1574 void* os::get_default_process_handle() {
1575 #ifdef __APPLE__
1576 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1577 // to avoid finding unexpected symbols on second (or later)
1578 // loads of a library.
1579 return (void*)::dlopen(NULL, RTLD_FIRST);
1580 #else
1581 return (void*)::dlopen(NULL, RTLD_LAZY);
1582 #endif
1583 }
1584
1585 // XXX: Do we need a lock around this as per Linux?
1586 void* os::dll_lookup(void* handle, const char* name) {
1587 return dlsym(handle, name);
1588 }
1589
1590
1591 static bool _print_ascii_file(const char* filename, outputStream* st) {
1592 int fd = ::open(filename, O_RDONLY);
1593 if (fd == -1) {
1594 return false;
1595 }
1596
1597 char buf[32];
1598 int bytes;
1599 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1600 st->print_raw(buf, bytes);
1601 }
1602
1603 ::close(fd);
1604
1605 return true;
1606 }
1607
1608 void os::print_dll_info(outputStream *st) {
1609 st->print_cr("Dynamic libraries:");
1610 #ifdef RTLD_DI_LINKMAP
1611 Dl_info dli;
1612 void *handle;
1613 Link_map *map;
1614 Link_map *p;
1615
1616 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1617 dli.dli_fname == NULL) {
1618 st->print_cr("Error: Cannot print dynamic libraries.");
1619 return;
1620 }
1621 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1622 if (handle == NULL) {
1623 st->print_cr("Error: Cannot print dynamic libraries.");
1624 return;
1625 }
1626 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1627 if (map == NULL) {
1628 st->print_cr("Error: Cannot print dynamic libraries.");
1629 return;
1630 }
1631
1632 while (map->l_prev != NULL)
1633 map = map->l_prev;
1634
1635 while (map != NULL) {
1636 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1637 map = map->l_next;
1638 }
1639
1640 dlclose(handle);
1641 #elif defined(__APPLE__)
1642 uint32_t count;
1643 uint32_t i;
1644
1645 count = _dyld_image_count();
1646 for (i = 1; i < count; i++) {
1647 const char *name = _dyld_get_image_name(i);
1648 intptr_t slide = _dyld_get_image_vmaddr_slide(i);
1649 st->print_cr(PTR_FORMAT " \t%s", slide, name);
1650 }
1651 #else
1652 st->print_cr("Error: Cannot print dynamic libraries.");
1653 #endif
1654 }
1655
1656 void os::print_os_info_brief(outputStream* st) {
1657 st->print("Bsd");
1658
1659 os::Posix::print_uname_info(st);
1660 }
1661
1662 void os::print_os_info(outputStream* st) {
1663 st->print("OS:");
1664 st->print("Bsd");
1665
1666 os::Posix::print_uname_info(st);
1667
1668 os::Posix::print_rlimit_info(st);
1669
1670 os::Posix::print_load_average(st);
1671 }
1672
1673 void os::pd_print_cpu_info(outputStream* st) {
1674 // Nothing to do for now.
1675 }
1676
1677 void os::print_memory_info(outputStream* st) {
1678
1679 st->print("Memory:");
1680 st->print(" %dk page", os::vm_page_size()>>10);
1681
1682 st->print(", physical " UINT64_FORMAT "k",
1683 os::physical_memory() >> 10);
1684 st->print("(" UINT64_FORMAT "k free)",
1685 os::available_memory() >> 10);
1686 st->cr();
1687
1688 // meminfo
1689 st->print("\n/proc/meminfo:\n");
1690 _print_ascii_file("/proc/meminfo", st);
1691 st->cr();
1692 }
1693
1694 void os::print_siginfo(outputStream* st, void* siginfo) {
1695 const siginfo_t* si = (const siginfo_t*)siginfo;
1696
1697 os::Posix::print_siginfo_brief(st, si);
1698
1699 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
1700 UseSharedSpaces) {
1701 FileMapInfo* mapinfo = FileMapInfo::current_info();
1702 if (mapinfo->is_in_shared_space(si->si_addr)) {
1703 st->print("\n\nError accessing class data sharing archive." \
1704 " Mapped file inaccessible during execution, " \
1705 " possible disk/network problem.");
1706 }
1707 }
1708 st->cr();
1709 }
1710
1711
1712 static void print_signal_handler(outputStream* st, int sig,
1713 char* buf, size_t buflen);
1714
1715 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1716 st->print_cr("Signal Handlers:");
1717 print_signal_handler(st, SIGSEGV, buf, buflen);
1718 print_signal_handler(st, SIGBUS , buf, buflen);
1719 print_signal_handler(st, SIGFPE , buf, buflen);
1720 print_signal_handler(st, SIGPIPE, buf, buflen);
1721 print_signal_handler(st, SIGXFSZ, buf, buflen);
1722 print_signal_handler(st, SIGILL , buf, buflen);
1723 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1724 print_signal_handler(st, SR_signum, buf, buflen);
1725 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1726 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1727 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1728 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1729 }
1730
1731 static char saved_jvm_path[MAXPATHLEN] = {0};
1732
1733 // Find the full path to the current module, libjvm
1734 void os::jvm_path(char *buf, jint buflen) {
1735 // Error checking.
1736 if (buflen < MAXPATHLEN) {
1737 assert(false, "must use a large-enough buffer");
1738 buf[0] = '\0';
1739 return;
1740 }
1741 // Lazy resolve the path to current module.
1742 if (saved_jvm_path[0] != 0) {
1743 strcpy(buf, saved_jvm_path);
1744 return;
1745 }
1746
1747 char dli_fname[MAXPATHLEN];
1748 bool ret = dll_address_to_library_name(
1749 CAST_FROM_FN_PTR(address, os::jvm_path),
1750 dli_fname, sizeof(dli_fname), NULL);
1751 assert(ret, "cannot locate libjvm");
1752 char *rp = NULL;
1753 if (ret && dli_fname[0] != '\0') {
1754 rp = realpath(dli_fname, buf);
1755 }
1756 if (rp == NULL)
1757 return;
1758
1759 if (Arguments::created_by_gamma_launcher()) {
1760 // Support for the gamma launcher. Typical value for buf is
1761 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at
1762 // the right place in the string, then assume we are installed in a JDK and
1763 // we're done. Otherwise, check for a JAVA_HOME environment variable and
1764 // construct a path to the JVM being overridden.
1765
1766 const char *p = buf + strlen(buf) - 1;
1767 for (int count = 0; p > buf && count < 5; ++count) {
1768 for (--p; p > buf && *p != '/'; --p)
1769 /* empty */ ;
1770 }
1771
1772 if (strncmp(p, "/jre/lib/", 9) != 0) {
1773 // Look for JAVA_HOME in the environment.
1774 char* java_home_var = ::getenv("JAVA_HOME");
1775 if (java_home_var != NULL && java_home_var[0] != 0) {
1776 char* jrelib_p;
1777 int len;
1778
1779 // Check the current module name "libjvm"
1780 p = strrchr(buf, '/');
1781 assert(strstr(p, "/libjvm") == p, "invalid library name");
1782
1783 rp = realpath(java_home_var, buf);
1784 if (rp == NULL)
1785 return;
1786
1787 // determine if this is a legacy image or modules image
1788 // modules image doesn't have "jre" subdirectory
1789 len = strlen(buf);
1790 jrelib_p = buf + len;
1791
1792 // Add the appropriate library subdir
1793 snprintf(jrelib_p, buflen-len, "/jre/lib");
1794 if (0 != access(buf, F_OK)) {
1795 snprintf(jrelib_p, buflen-len, "/lib");
1796 }
1797
1798 // Add the appropriate client or server subdir
1799 len = strlen(buf);
1800 jrelib_p = buf + len;
1801 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1802 if (0 != access(buf, F_OK)) {
1803 snprintf(jrelib_p, buflen-len, "");
1804 }
1805
1806 // If the path exists within JAVA_HOME, add the JVM library name
1807 // to complete the path to JVM being overridden. Otherwise fallback
1808 // to the path to the current library.
1809 if (0 == access(buf, F_OK)) {
1810 // Use current module name "libjvm"
1811 len = strlen(buf);
1812 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1813 } else {
1814 // Fall back to path of current library
1815 rp = realpath(dli_fname, buf);
1816 if (rp == NULL)
1817 return;
1818 }
1819 }
1820 }
1821 }
1822
1823 strcpy(saved_jvm_path, buf);
1824 }
1825
1826 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1827 // no prefix required, not even "_"
1828 }
1829
1830 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1831 // no suffix required
1832 }
1833
1834 ////////////////////////////////////////////////////////////////////////////////
1835 // sun.misc.Signal support
1836
1837 static volatile jint sigint_count = 0;
1838
1839 static void
1840 UserHandler(int sig, void *siginfo, void *context) {
1841 // 4511530 - sem_post is serialized and handled by the manager thread. When
1842 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1843 // don't want to flood the manager thread with sem_post requests.
1844 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1845 return;
1846
1847 // Ctrl-C is pressed during error reporting, likely because the error
1848 // handler fails to abort. Let VM die immediately.
1849 if (sig == SIGINT && is_error_reported()) {
1850 os::die();
1851 }
1852
1853 os::signal_notify(sig);
1854 }
1855
1856 void* os::user_handler() {
1857 return CAST_FROM_FN_PTR(void*, UserHandler);
1858 }
1859
1860 extern "C" {
1861 typedef void (*sa_handler_t)(int);
1862 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1863 }
1864
1865 void* os::signal(int signal_number, void* handler) {
1866 struct sigaction sigAct, oldSigAct;
1867
1868 sigfillset(&(sigAct.sa_mask));
1869 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1870 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1871
1872 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1873 // -1 means registration failed
1874 return (void *)-1;
1875 }
1876
1877 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1878 }
1879
1880 void os::signal_raise(int signal_number) {
1881 ::raise(signal_number);
1882 }
1883
1884 /*
1885 * The following code is moved from os.cpp for making this
1886 * code platform specific, which it is by its very nature.
1887 */
1888
1889 // Will be modified when max signal is changed to be dynamic
1890 int os::sigexitnum_pd() {
1891 return NSIG;
1892 }
1893
1894 // a counter for each possible signal value
1895 static volatile jint pending_signals[NSIG+1] = { 0 };
1896
1897 // Bsd(POSIX) specific hand shaking semaphore.
1898 #ifdef __APPLE__
1899 typedef semaphore_t os_semaphore_t;
1900 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1901 #define SEM_WAIT(sem) semaphore_wait(sem)
1902 #define SEM_POST(sem) semaphore_signal(sem)
1903 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1904 #else
1905 typedef sem_t os_semaphore_t;
1906 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1907 #define SEM_WAIT(sem) sem_wait(&sem)
1908 #define SEM_POST(sem) sem_post(&sem)
1909 #define SEM_DESTROY(sem) sem_destroy(&sem)
1910 #endif
1911
1912 class Semaphore : public StackObj {
1913 public:
1914 Semaphore();
1915 ~Semaphore();
1916 void signal();
1917 void wait();
1918 bool trywait();
1919 bool timedwait(unsigned int sec, int nsec);
1920 private:
1921 jlong currenttime() const;
1922 os_semaphore_t _semaphore;
1923 };
1924
1925 Semaphore::Semaphore() : _semaphore(0) {
1926 SEM_INIT(_semaphore, 0);
1927 }
1928
1929 Semaphore::~Semaphore() {
1930 SEM_DESTROY(_semaphore);
1931 }
1932
1933 void Semaphore::signal() {
1934 SEM_POST(_semaphore);
1935 }
1936
1937 void Semaphore::wait() {
1938 SEM_WAIT(_semaphore);
1939 }
1940
1941 jlong Semaphore::currenttime() const {
1942 struct timeval tv;
1943 gettimeofday(&tv, NULL);
1944 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1945 }
1946
1947 #ifdef __APPLE__
1948 bool Semaphore::trywait() {
1949 return timedwait(0, 0);
1950 }
1951
1952 bool Semaphore::timedwait(unsigned int sec, int nsec) {
1953 kern_return_t kr = KERN_ABORTED;
1954 mach_timespec_t waitspec;
1955 waitspec.tv_sec = sec;
1956 waitspec.tv_nsec = nsec;
1957
1958 jlong starttime = currenttime();
1959
1960 kr = semaphore_timedwait(_semaphore, waitspec);
1961 while (kr == KERN_ABORTED) {
1962 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1963
1964 jlong current = currenttime();
1965 jlong passedtime = current - starttime;
1966
1967 if (passedtime >= totalwait) {
1968 waitspec.tv_sec = 0;
1969 waitspec.tv_nsec = 0;
1970 } else {
1971 jlong waittime = totalwait - (current - starttime);
1972 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
1973 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
1974 }
1975
1976 kr = semaphore_timedwait(_semaphore, waitspec);
1977 }
1978
1979 return kr == KERN_SUCCESS;
1980 }
1981
1982 #else
1983
1984 bool Semaphore::trywait() {
1985 return sem_trywait(&_semaphore) == 0;
1986 }
1987
1988 bool Semaphore::timedwait(unsigned int sec, int nsec) {
1989 struct timespec ts;
1990 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
1991
1992 while (1) {
1993 int result = sem_timedwait(&_semaphore, &ts);
1994 if (result == 0) {
1995 return true;
1996 } else if (errno == EINTR) {
1997 continue;
1998 } else if (errno == ETIMEDOUT) {
1999 return false;
2000 } else {
2001 return false;
2002 }
2003 }
2004 }
2005
2006 #endif // __APPLE__
2007
2008 static os_semaphore_t sig_sem;
2009 static Semaphore sr_semaphore;
2010
2011 void os::signal_init_pd() {
2012 // Initialize signal structures
2013 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2014
2015 // Initialize signal semaphore
2016 ::SEM_INIT(sig_sem, 0);
2017 }
2018
2019 void os::signal_notify(int sig) {
2020 Atomic::inc(&pending_signals[sig]);
2021 ::SEM_POST(sig_sem);
2022 }
2023
2024 static int check_pending_signals(bool wait) {
2025 Atomic::store(0, &sigint_count);
2026 for (;;) {
2027 for (int i = 0; i < NSIG + 1; i++) {
2028 jint n = pending_signals[i];
2029 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2030 return i;
2031 }
2032 }
2033 if (!wait) {
2034 return -1;
2035 }
2036 JavaThread *thread = JavaThread::current();
2037 ThreadBlockInVM tbivm(thread);
2038
2039 bool threadIsSuspended;
2040 do {
2041 thread->set_suspend_equivalent();
2042 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2043 ::SEM_WAIT(sig_sem);
2044
2045 // were we externally suspended while we were waiting?
2046 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2047 if (threadIsSuspended) {
2048 //
2049 // The semaphore has been incremented, but while we were waiting
2050 // another thread suspended us. We don't want to continue running
2051 // while suspended because that would surprise the thread that
2052 // suspended us.
2053 //
2054 ::SEM_POST(sig_sem);
2055
2056 thread->java_suspend_self();
2057 }
2058 } while (threadIsSuspended);
2059 }
2060 }
2061
2062 int os::signal_lookup() {
2063 return check_pending_signals(false);
2064 }
2065
2066 int os::signal_wait() {
2067 return check_pending_signals(true);
2068 }
2069
2070 ////////////////////////////////////////////////////////////////////////////////
2071 // Virtual Memory
2072
2073 int os::vm_page_size() {
2074 // Seems redundant as all get out
2075 assert(os::Bsd::page_size() != -1, "must call os::init");
2076 return os::Bsd::page_size();
2077 }
2078
2079 // Solaris allocates memory by pages.
2080 int os::vm_allocation_granularity() {
2081 assert(os::Bsd::page_size() != -1, "must call os::init");
2082 return os::Bsd::page_size();
2083 }
2084
2085 // Rationale behind this function:
2086 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2087 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2088 // samples for JITted code. Here we create private executable mapping over the code cache
2089 // and then we can use standard (well, almost, as mapping can change) way to provide
2090 // info for the reporting script by storing timestamp and location of symbol
2091 void bsd_wrap_code(char* base, size_t size) {
2092 static volatile jint cnt = 0;
2093
2094 if (!UseOprofile) {
2095 return;
2096 }
2097
2098 char buf[PATH_MAX + 1];
2099 int num = Atomic::add(1, &cnt);
2100
2101 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2102 os::get_temp_directory(), os::current_process_id(), num);
2103 unlink(buf);
2104
2105 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2106
2107 if (fd != -1) {
2108 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2109 if (rv != (off_t)-1) {
2110 if (::write(fd, "", 1) == 1) {
2111 mmap(base, size,
2112 PROT_READ|PROT_WRITE|PROT_EXEC,
2113 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2114 }
2115 }
2116 ::close(fd);
2117 unlink(buf);
2118 }
2119 }
2120
2121 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2122 int err) {
2123 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2124 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2125 strerror(err), err);
2126 }
2127
2128 // NOTE: Bsd kernel does not really reserve the pages for us.
2129 // All it does is to check if there are enough free pages
2130 // left at the time of mmap(). This could be a potential
2131 // problem.
2132 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2133 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2134 #ifdef __OpenBSD__
2135 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2136 if (::mprotect(addr, size, prot) == 0) {
2137 return true;
2138 }
2139 #else
2140 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2141 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2142 if (res != (uintptr_t) MAP_FAILED) {
2143 return true;
2144 }
2145 #endif
2146
2147 // Warn about any commit errors we see in non-product builds just
2148 // in case mmap() doesn't work as described on the man page.
2149 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2150
2151 return false;
2152 }
2153
2154 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2155 bool exec) {
2156 // alignment_hint is ignored on this OS
2157 return pd_commit_memory(addr, size, exec);
2158 }
2159
2160 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2161 const char* mesg) {
2162 assert(mesg != NULL, "mesg must be specified");
2163 if (!pd_commit_memory(addr, size, exec)) {
2164 // add extra info in product mode for vm_exit_out_of_memory():
2165 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2166 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
2167 }
2168 }
2169
2170 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2171 size_t alignment_hint, bool exec,
2172 const char* mesg) {
2173 // alignment_hint is ignored on this OS
2174 pd_commit_memory_or_exit(addr, size, exec, mesg);
2175 }
2176
2177 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2178 }
2179
2180 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2181 ::madvise(addr, bytes, MADV_DONTNEED);
2182 }
2183
2184 void os::numa_make_global(char *addr, size_t bytes) {
2185 }
2186
2187 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2188 }
2189
2190 bool os::numa_topology_changed() { return false; }
2191
2192 size_t os::numa_get_groups_num() {
2193 return 1;
2194 }
2195
2196 int os::numa_get_group_id() {
2197 return 0;
2198 }
2199
2200 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2201 if (size > 0) {
2202 ids[0] = 0;
2203 return 1;
2204 }
2205 return 0;
2206 }
2207
2208 bool os::get_page_info(char *start, page_info* info) {
2209 return false;
2210 }
2211
2212 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2213 return end;
2214 }
2215
2216
2217 bool os::pd_uncommit_memory(char* addr, size_t size) {
2218 #ifdef __OpenBSD__
2219 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2220 return ::mprotect(addr, size, PROT_NONE) == 0;
2221 #else
2222 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2223 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2224 return res != (uintptr_t) MAP_FAILED;
2225 #endif
2226 }
2227
2228 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2229 return os::commit_memory(addr, size, !ExecMem);
2230 }
2231
2232 // If this is a growable mapping, remove the guard pages entirely by
2233 // munmap()ping them. If not, just call uncommit_memory().
2234 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2235 return os::uncommit_memory(addr, size);
2236 }
2237
2238 static address _highest_vm_reserved_address = NULL;
2239
2240 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2241 // at 'requested_addr'. If there are existing memory mappings at the same
2242 // location, however, they will be overwritten. If 'fixed' is false,
2243 // 'requested_addr' is only treated as a hint, the return value may or
2244 // may not start from the requested address. Unlike Bsd mmap(), this
2245 // function returns NULL to indicate failure.
2246 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2247 char * addr;
2248 int flags;
2249
2250 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2251 if (fixed) {
2252 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2253 flags |= MAP_FIXED;
2254 }
2255
2256 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2257 // touch an uncommitted page. Otherwise, the read/write might
2258 // succeed if we have enough swap space to back the physical page.
2259 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2260 flags, -1, 0);
2261
2262 if (addr != MAP_FAILED) {
2263 // anon_mmap() should only get called during VM initialization,
2264 // don't need lock (actually we can skip locking even it can be called
2265 // from multiple threads, because _highest_vm_reserved_address is just a
2266 // hint about the upper limit of non-stack memory regions.)
2267 if ((address)addr + bytes > _highest_vm_reserved_address) {
2268 _highest_vm_reserved_address = (address)addr + bytes;
2269 }
2270 }
2271
2272 return addr == MAP_FAILED ? NULL : addr;
2273 }
2274
2275 // Don't update _highest_vm_reserved_address, because there might be memory
2276 // regions above addr + size. If so, releasing a memory region only creates
2277 // a hole in the address space, it doesn't help prevent heap-stack collision.
2278 //
2279 static int anon_munmap(char * addr, size_t size) {
2280 return ::munmap(addr, size) == 0;
2281 }
2282
2283 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2284 size_t alignment_hint) {
2285 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2286 }
2287
2288 bool os::pd_release_memory(char* addr, size_t size) {
2289 return anon_munmap(addr, size);
2290 }
2291
2292 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2293 // Bsd wants the mprotect address argument to be page aligned.
2294 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
2295
2296 // According to SUSv3, mprotect() should only be used with mappings
2297 // established by mmap(), and mmap() always maps whole pages. Unaligned
2298 // 'addr' likely indicates problem in the VM (e.g. trying to change
2299 // protection of malloc'ed or statically allocated memory). Check the
2300 // caller if you hit this assert.
2301 assert(addr == bottom, "sanity check");
2302
2303 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2304 return ::mprotect(bottom, size, prot) == 0;
2305 }
2306
2307 // Set protections specified
2308 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2309 bool is_committed) {
2310 unsigned int p = 0;
2311 switch (prot) {
2312 case MEM_PROT_NONE: p = PROT_NONE; break;
2313 case MEM_PROT_READ: p = PROT_READ; break;
2314 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2315 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2316 default:
2317 ShouldNotReachHere();
2318 }
2319 // is_committed is unused.
2320 return bsd_mprotect(addr, bytes, p);
2321 }
2322
2323 bool os::guard_memory(char* addr, size_t size) {
2324 return bsd_mprotect(addr, size, PROT_NONE);
2325 }
2326
2327 bool os::unguard_memory(char* addr, size_t size) {
2328 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2329 }
2330
2331 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2332 return false;
2333 }
2334
2335 // Large page support
2336
2337 static size_t _large_page_size = 0;
2338
2339 void os::large_page_init() {
2340 }
2341
2342
2343 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2344 fatal("This code is not used or maintained.");
2345
2346 // "exec" is passed in but not used. Creating the shared image for
2347 // the code cache doesn't have an SHM_X executable permission to check.
2348 assert(UseLargePages && UseSHM, "only for SHM large pages");
2349
2350 key_t key = IPC_PRIVATE;
2351 char *addr;
2352
2353 bool warn_on_failure = UseLargePages &&
2354 (!FLAG_IS_DEFAULT(UseLargePages) ||
2355 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
2356 );
2357 char msg[128];
2358
2359 // Create a large shared memory region to attach to based on size.
2360 // Currently, size is the total size of the heap
2361 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2362 if (shmid == -1) {
2363 // Possible reasons for shmget failure:
2364 // 1. shmmax is too small for Java heap.
2365 // > check shmmax value: cat /proc/sys/kernel/shmmax
2366 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2367 // 2. not enough large page memory.
2368 // > check available large pages: cat /proc/meminfo
2369 // > increase amount of large pages:
2370 // echo new_value > /proc/sys/vm/nr_hugepages
2371 // Note 1: different Bsd may use different name for this property,
2372 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2373 // Note 2: it's possible there's enough physical memory available but
2374 // they are so fragmented after a long run that they can't
2375 // coalesce into large pages. Try to reserve large pages when
2376 // the system is still "fresh".
2377 if (warn_on_failure) {
2378 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
2379 warning(msg);
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 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
2397 warning(msg);
2398 }
2399 return NULL;
2400 }
2401
2402 // The memory is committed
2403 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC);
2404
2405 return addr;
2406 }
2407
2408 bool os::release_memory_special(char* base, size_t bytes) {
2409 MemTracker::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 tkr.discard();
2417 return false;
2418 }
2419
2420 }
2421
2422 size_t os::large_page_size() {
2423 return _large_page_size;
2424 }
2425
2426 // HugeTLBFS allows application to commit large page memory on demand;
2427 // with SysV SHM the entire memory region must be allocated as shared
2428 // memory.
2429 bool os::can_commit_large_page_memory() {
2430 return UseHugeTLBFS;
2431 }
2432
2433 bool os::can_execute_large_page_memory() {
2434 return UseHugeTLBFS;
2435 }
2436
2437 // Reserve memory at an arbitrary address, only if that area is
2438 // available (and not reserved for something else).
2439
2440 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2441 const int max_tries = 10;
2442 char* base[max_tries];
2443 size_t size[max_tries];
2444 const size_t gap = 0x000000;
2445
2446 // Assert only that the size is a multiple of the page size, since
2447 // that's all that mmap requires, and since that's all we really know
2448 // about at this low abstraction level. If we need higher alignment,
2449 // we can either pass an alignment to this method or verify alignment
2450 // in one of the methods further up the call chain. See bug 5044738.
2451 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2452
2453 // Repeatedly allocate blocks until the block is allocated at the
2454 // right spot. Give up after max_tries. Note that reserve_memory() will
2455 // automatically update _highest_vm_reserved_address if the call is
2456 // successful. The variable tracks the highest memory address every reserved
2457 // by JVM. It is used to detect heap-stack collision if running with
2458 // fixed-stack BsdThreads. Because here we may attempt to reserve more
2459 // space than needed, it could confuse the collision detecting code. To
2460 // solve the problem, save current _highest_vm_reserved_address and
2461 // calculate the correct value before return.
2462 address old_highest = _highest_vm_reserved_address;
2463
2464 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2465 // if kernel honors the hint then we can return immediately.
2466 char * addr = anon_mmap(requested_addr, bytes, false);
2467 if (addr == requested_addr) {
2468 return requested_addr;
2469 }
2470
2471 if (addr != NULL) {
2472 // mmap() is successful but it fails to reserve at the requested address
2473 anon_munmap(addr, bytes);
2474 }
2475
2476 int i;
2477 for (i = 0; i < max_tries; ++i) {
2478 base[i] = reserve_memory(bytes);
2479
2480 if (base[i] != NULL) {
2481 // Is this the block we wanted?
2482 if (base[i] == requested_addr) {
2483 size[i] = bytes;
2484 break;
2485 }
2486
2487 // Does this overlap the block we wanted? Give back the overlapped
2488 // parts and try again.
2489
2490 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2491 if (top_overlap >= 0 && top_overlap < bytes) {
2492 unmap_memory(base[i], top_overlap);
2493 base[i] += top_overlap;
2494 size[i] = bytes - top_overlap;
2495 } else {
2496 size_t bottom_overlap = base[i] + bytes - requested_addr;
2497 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2498 unmap_memory(requested_addr, bottom_overlap);
2499 size[i] = bytes - bottom_overlap;
2500 } else {
2501 size[i] = bytes;
2502 }
2503 }
2504 }
2505 }
2506
2507 // Give back the unused reserved pieces.
2508
2509 for (int j = 0; j < i; ++j) {
2510 if (base[j] != NULL) {
2511 unmap_memory(base[j], size[j]);
2512 }
2513 }
2514
2515 if (i < max_tries) {
2516 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes);
2517 return requested_addr;
2518 } else {
2519 _highest_vm_reserved_address = old_highest;
2520 return NULL;
2521 }
2522 }
2523
2524 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2525 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2526 }
2527
2528 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation.
2529 // Solaris uses poll(), bsd uses park().
2530 // Poll() is likely a better choice, assuming that Thread.interrupt()
2531 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with
2532 // SIGSEGV, see 4355769.
2533
2534 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
2535 assert(thread == Thread::current(), "thread consistency check");
2536
2537 ParkEvent * const slp = thread->_SleepEvent ;
2538 slp->reset() ;
2539 OrderAccess::fence() ;
2540
2541 if (interruptible) {
2542 jlong prevtime = javaTimeNanos();
2543
2544 for (;;) {
2545 if (os::is_interrupted(thread, true)) {
2546 return OS_INTRPT;
2547 }
2548
2549 jlong newtime = javaTimeNanos();
2550
2551 if (newtime - prevtime < 0) {
2552 // time moving backwards, should only happen if no monotonic clock
2553 // not a guarantee() because JVM should not abort on kernel/glibc bugs
2554 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
2555 } else {
2556 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2557 }
2558
2559 if(millis <= 0) {
2560 return OS_OK;
2561 }
2562
2563 prevtime = newtime;
2564
2565 {
2566 assert(thread->is_Java_thread(), "sanity check");
2567 JavaThread *jt = (JavaThread *) thread;
2568 ThreadBlockInVM tbivm(jt);
2569 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
2570
2571 jt->set_suspend_equivalent();
2572 // cleared by handle_special_suspend_equivalent_condition() or
2573 // java_suspend_self() via check_and_wait_while_suspended()
2574
2575 slp->park(millis);
2576
2577 // were we externally suspended while we were waiting?
2578 jt->check_and_wait_while_suspended();
2579 }
2580 }
2581 } else {
2582 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
2583 jlong prevtime = javaTimeNanos();
2584
2585 for (;;) {
2586 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
2587 // the 1st iteration ...
2588 jlong newtime = javaTimeNanos();
2589
2590 if (newtime - prevtime < 0) {
2591 // time moving backwards, should only happen if no monotonic clock
2592 // not a guarantee() because JVM should not abort on kernel/glibc bugs
2593 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
2594 } else {
2595 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2596 }
2597
2598 if(millis <= 0) break ;
2599
2600 prevtime = newtime;
2601 slp->park(millis);
2602 }
2603 return OS_OK ;
2604 }
2605 }
2606
2607 void os::naked_short_sleep(jlong ms) {
2608 struct timespec req;
2609
2610 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2611 req.tv_sec = 0;
2612 if (ms > 0) {
2613 req.tv_nsec = (ms % 1000) * 1000000;
2614 }
2615 else {
2616 req.tv_nsec = 1;
2617 }
2618
2619 nanosleep(&req, NULL);
2620
2621 return;
2622 }
2623
2624 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2625 void os::infinite_sleep() {
2626 while (true) { // sleep forever ...
2627 ::sleep(100); // ... 100 seconds at a time
2628 }
2629 }
2630
2631 // Used to convert frequent JVM_Yield() to nops
2632 bool os::dont_yield() {
2633 return DontYieldALot;
2634 }
2635
2636 void os::yield() {
2637 sched_yield();
2638 }
2639
2640 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
2641
2642 void os::yield_all(int attempts) {
2643 // Yields to all threads, including threads with lower priorities
2644 // Threads on Bsd are all with same priority. The Solaris style
2645 // os::yield_all() with nanosleep(1ms) is not necessary.
2646 sched_yield();
2647 }
2648
2649 // Called from the tight loops to possibly influence time-sharing heuristics
2650 void os::loop_breaker(int attempts) {
2651 os::yield_all(attempts);
2652 }
2653
2654 ////////////////////////////////////////////////////////////////////////////////
2655 // thread priority support
2656
2657 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2658 // only supports dynamic priority, static priority must be zero. For real-time
2659 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2660 // However, for large multi-threaded applications, SCHED_RR is not only slower
2661 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2662 // of 5 runs - Sep 2005).
2663 //
2664 // The following code actually changes the niceness of kernel-thread/LWP. It
2665 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2666 // not the entire user process, and user level threads are 1:1 mapped to kernel
2667 // threads. It has always been the case, but could change in the future. For
2668 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2669 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2670
2671 #if !defined(__APPLE__)
2672 int os::java_to_os_priority[CriticalPriority + 1] = {
2673 19, // 0 Entry should never be used
2674
2675 0, // 1 MinPriority
2676 3, // 2
2677 6, // 3
2678
2679 10, // 4
2680 15, // 5 NormPriority
2681 18, // 6
2682
2683 21, // 7
2684 25, // 8
2685 28, // 9 NearMaxPriority
2686
2687 31, // 10 MaxPriority
2688
2689 31 // 11 CriticalPriority
2690 };
2691 #else
2692 /* Using Mach high-level priority assignments */
2693 int os::java_to_os_priority[CriticalPriority + 1] = {
2694 0, // 0 Entry should never be used (MINPRI_USER)
2695
2696 27, // 1 MinPriority
2697 28, // 2
2698 29, // 3
2699
2700 30, // 4
2701 31, // 5 NormPriority (BASEPRI_DEFAULT)
2702 32, // 6
2703
2704 33, // 7
2705 34, // 8
2706 35, // 9 NearMaxPriority
2707
2708 36, // 10 MaxPriority
2709
2710 36 // 11 CriticalPriority
2711 };
2712 #endif
2713
2714 static int prio_init() {
2715 if (ThreadPriorityPolicy == 1) {
2716 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2717 // if effective uid is not root. Perhaps, a more elegant way of doing
2718 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2719 if (geteuid() != 0) {
2720 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2721 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2722 }
2723 ThreadPriorityPolicy = 0;
2724 }
2725 }
2726 if (UseCriticalJavaThreadPriority) {
2727 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2728 }
2729 return 0;
2730 }
2731
2732 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2733 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK;
2734
2735 #ifdef __OpenBSD__
2736 // OpenBSD pthread_setprio starves low priority threads
2737 return OS_OK;
2738 #elif defined(__FreeBSD__)
2739 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2740 #elif defined(__APPLE__) || defined(__NetBSD__)
2741 struct sched_param sp;
2742 int policy;
2743 pthread_t self = pthread_self();
2744
2745 if (pthread_getschedparam(self, &policy, &sp) != 0)
2746 return OS_ERR;
2747
2748 sp.sched_priority = newpri;
2749 if (pthread_setschedparam(self, policy, &sp) != 0)
2750 return OS_ERR;
2751
2752 return OS_OK;
2753 #else
2754 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2755 return (ret == 0) ? OS_OK : OS_ERR;
2756 #endif
2757 }
2758
2759 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2760 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) {
2761 *priority_ptr = java_to_os_priority[NormPriority];
2762 return OS_OK;
2763 }
2764
2765 errno = 0;
2766 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2767 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2768 #elif defined(__APPLE__) || defined(__NetBSD__)
2769 int policy;
2770 struct sched_param sp;
2771
2772 pthread_getschedparam(pthread_self(), &policy, &sp);
2773 *priority_ptr = sp.sched_priority;
2774 #else
2775 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2776 #endif
2777 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2778 }
2779
2780 // Hint to the underlying OS that a task switch would not be good.
2781 // Void return because it's a hint and can fail.
2782 void os::hint_no_preempt() {}
2783
2784 ////////////////////////////////////////////////////////////////////////////////
2785 // suspend/resume support
2786
2787 // the low-level signal-based suspend/resume support is a remnant from the
2788 // old VM-suspension that used to be for java-suspension, safepoints etc,
2789 // within hotspot. Now there is a single use-case for this:
2790 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2791 // that runs in the watcher thread.
2792 // The remaining code is greatly simplified from the more general suspension
2793 // code that used to be used.
2794 //
2795 // The protocol is quite simple:
2796 // - suspend:
2797 // - sends a signal to the target thread
2798 // - polls the suspend state of the osthread using a yield loop
2799 // - target thread signal handler (SR_handler) sets suspend state
2800 // and blocks in sigsuspend until continued
2801 // - resume:
2802 // - sets target osthread state to continue
2803 // - sends signal to end the sigsuspend loop in the SR_handler
2804 //
2805 // Note that the SR_lock plays no role in this suspend/resume protocol.
2806 //
2807
2808 static void resume_clear_context(OSThread *osthread) {
2809 osthread->set_ucontext(NULL);
2810 osthread->set_siginfo(NULL);
2811 }
2812
2813 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2814 osthread->set_ucontext(context);
2815 osthread->set_siginfo(siginfo);
2816 }
2817
2818 //
2819 // Handler function invoked when a thread's execution is suspended or
2820 // resumed. We have to be careful that only async-safe functions are
2821 // called here (Note: most pthread functions are not async safe and
2822 // should be avoided.)
2823 //
2824 // Note: sigwait() is a more natural fit than sigsuspend() from an
2825 // interface point of view, but sigwait() prevents the signal hander
2826 // from being run. libpthread would get very confused by not having
2827 // its signal handlers run and prevents sigwait()'s use with the
2828 // mutex granting granting signal.
2829 //
2830 // Currently only ever called on the VMThread or JavaThread
2831 //
2832 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2833 // Save and restore errno to avoid confusing native code with EINTR
2834 // after sigsuspend.
2835 int old_errno = errno;
2836
2837 Thread* thread = Thread::current();
2838 OSThread* osthread = thread->osthread();
2839 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2840
2841 os::SuspendResume::State current = osthread->sr.state();
2842 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2843 suspend_save_context(osthread, siginfo, context);
2844
2845 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2846 os::SuspendResume::State state = osthread->sr.suspended();
2847 if (state == os::SuspendResume::SR_SUSPENDED) {
2848 sigset_t suspend_set; // signals for sigsuspend()
2849
2850 // get current set of blocked signals and unblock resume signal
2851 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2852 sigdelset(&suspend_set, SR_signum);
2853
2854 sr_semaphore.signal();
2855 // wait here until we are resumed
2856 while (1) {
2857 sigsuspend(&suspend_set);
2858
2859 os::SuspendResume::State result = osthread->sr.running();
2860 if (result == os::SuspendResume::SR_RUNNING) {
2861 sr_semaphore.signal();
2862 break;
2863 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2864 ShouldNotReachHere();
2865 }
2866 }
2867
2868 } else if (state == os::SuspendResume::SR_RUNNING) {
2869 // request was cancelled, continue
2870 } else {
2871 ShouldNotReachHere();
2872 }
2873
2874 resume_clear_context(osthread);
2875 } else if (current == os::SuspendResume::SR_RUNNING) {
2876 // request was cancelled, continue
2877 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2878 // ignore
2879 } else {
2880 // ignore
2881 }
2882
2883 errno = old_errno;
2884 }
2885
2886
2887 static int SR_initialize() {
2888 struct sigaction act;
2889 char *s;
2890 /* Get signal number to use for suspend/resume */
2891 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2892 int sig = ::strtol(s, 0, 10);
2893 if (sig > 0 || sig < NSIG) {
2894 SR_signum = sig;
2895 }
2896 }
2897
2898 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2899 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2900
2901 sigemptyset(&SR_sigset);
2902 sigaddset(&SR_sigset, SR_signum);
2903
2904 /* Set up signal handler for suspend/resume */
2905 act.sa_flags = SA_RESTART|SA_SIGINFO;
2906 act.sa_handler = (void (*)(int)) SR_handler;
2907
2908 // SR_signum is blocked by default.
2909 // 4528190 - We also need to block pthread restart signal (32 on all
2910 // supported Bsd platforms). Note that BsdThreads need to block
2911 // this signal for all threads to work properly. So we don't have
2912 // to use hard-coded signal number when setting up the mask.
2913 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2914
2915 if (sigaction(SR_signum, &act, 0) == -1) {
2916 return -1;
2917 }
2918
2919 // Save signal flag
2920 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2921 return 0;
2922 }
2923
2924 static int sr_notify(OSThread* osthread) {
2925 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2926 assert_status(status == 0, status, "pthread_kill");
2927 return status;
2928 }
2929
2930 // "Randomly" selected value for how long we want to spin
2931 // before bailing out on suspending a thread, also how often
2932 // we send a signal to a thread we want to resume
2933 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2934 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2935
2936 // returns true on success and false on error - really an error is fatal
2937 // but this seems the normal response to library errors
2938 static bool do_suspend(OSThread* osthread) {
2939 assert(osthread->sr.is_running(), "thread should be running");
2940 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2941
2942 // mark as suspended and send signal
2943 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2944 // failed to switch, state wasn't running?
2945 ShouldNotReachHere();
2946 return false;
2947 }
2948
2949 if (sr_notify(osthread) != 0) {
2950 ShouldNotReachHere();
2951 }
2952
2953 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2954 while (true) {
2955 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2956 break;
2957 } else {
2958 // timeout
2959 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2960 if (cancelled == os::SuspendResume::SR_RUNNING) {
2961 return false;
2962 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2963 // make sure that we consume the signal on the semaphore as well
2964 sr_semaphore.wait();
2965 break;
2966 } else {
2967 ShouldNotReachHere();
2968 return false;
2969 }
2970 }
2971 }
2972
2973 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2974 return true;
2975 }
2976
2977 static void do_resume(OSThread* osthread) {
2978 assert(osthread->sr.is_suspended(), "thread should be suspended");
2979 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2980
2981 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2982 // failed to switch to WAKEUP_REQUEST
2983 ShouldNotReachHere();
2984 return;
2985 }
2986
2987 while (true) {
2988 if (sr_notify(osthread) == 0) {
2989 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2990 if (osthread->sr.is_running()) {
2991 return;
2992 }
2993 }
2994 } else {
2995 ShouldNotReachHere();
2996 }
2997 }
2998
2999 guarantee(osthread->sr.is_running(), "Must be running!");
3000 }
3001
3002 ////////////////////////////////////////////////////////////////////////////////
3003 // interrupt support
3004
3005 void os::interrupt(Thread* thread) {
3006 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
3007 "possibility of dangling Thread pointer");
3008
3009 OSThread* osthread = thread->osthread();
3010
3011 if (!osthread->interrupted()) {
3012 osthread->set_interrupted(true);
3013 // More than one thread can get here with the same value of osthread,
3014 // resulting in multiple notifications. We do, however, want the store
3015 // to interrupted() to be visible to other threads before we execute unpark().
3016 OrderAccess::fence();
3017 ParkEvent * const slp = thread->_SleepEvent ;
3018 if (slp != NULL) slp->unpark() ;
3019 }
3020
3021 // For JSR166. Unpark even if interrupt status already was set
3022 if (thread->is_Java_thread())
3023 ((JavaThread*)thread)->parker()->unpark();
3024
3025 ParkEvent * ev = thread->_ParkEvent ;
3026 if (ev != NULL) ev->unpark() ;
3027
3028 }
3029
3030 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3031 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
3032 "possibility of dangling Thread pointer");
3033
3034 OSThread* osthread = thread->osthread();
3035
3036 bool interrupted = osthread->interrupted();
3037
3038 if (interrupted && clear_interrupted) {
3039 osthread->set_interrupted(false);
3040 // consider thread->_SleepEvent->reset() ... optional optimization
3041 }
3042
3043 return interrupted;
3044 }
3045
3046 ///////////////////////////////////////////////////////////////////////////////////
3047 // signal handling (except suspend/resume)
3048
3049 // This routine may be used by user applications as a "hook" to catch signals.
3050 // The user-defined signal handler must pass unrecognized signals to this
3051 // routine, and if it returns true (non-zero), then the signal handler must
3052 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3053 // routine will never retun false (zero), but instead will execute a VM panic
3054 // routine kill the process.
3055 //
3056 // If this routine returns false, it is OK to call it again. This allows
3057 // the user-defined signal handler to perform checks either before or after
3058 // the VM performs its own checks. Naturally, the user code would be making
3059 // a serious error if it tried to handle an exception (such as a null check
3060 // or breakpoint) that the VM was generating for its own correct operation.
3061 //
3062 // This routine may recognize any of the following kinds of signals:
3063 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3064 // It should be consulted by handlers for any of those signals.
3065 //
3066 // The caller of this routine must pass in the three arguments supplied
3067 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3068 // field of the structure passed to sigaction(). This routine assumes that
3069 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3070 //
3071 // Note that the VM will print warnings if it detects conflicting signal
3072 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3073 //
3074 extern "C" JNIEXPORT int
3075 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
3076 void* ucontext, int abort_if_unrecognized);
3077
3078 void signalHandler(int sig, siginfo_t* info, void* uc) {
3079 assert(info != NULL && uc != NULL, "it must be old kernel");
3080 int orig_errno = errno; // Preserve errno value over signal handler.
3081 JVM_handle_bsd_signal(sig, info, uc, true);
3082 errno = orig_errno;
3083 }
3084
3085
3086 // This boolean allows users to forward their own non-matching signals
3087 // to JVM_handle_bsd_signal, harmlessly.
3088 bool os::Bsd::signal_handlers_are_installed = false;
3089
3090 // For signal-chaining
3091 struct sigaction os::Bsd::sigact[MAXSIGNUM];
3092 unsigned int os::Bsd::sigs = 0;
3093 bool os::Bsd::libjsig_is_loaded = false;
3094 typedef struct sigaction *(*get_signal_t)(int);
3095 get_signal_t os::Bsd::get_signal_action = NULL;
3096
3097 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
3098 struct sigaction *actp = NULL;
3099
3100 if (libjsig_is_loaded) {
3101 // Retrieve the old signal handler from libjsig
3102 actp = (*get_signal_action)(sig);
3103 }
3104 if (actp == NULL) {
3105 // Retrieve the preinstalled signal handler from jvm
3106 actp = get_preinstalled_handler(sig);
3107 }
3108
3109 return actp;
3110 }
3111
3112 static bool call_chained_handler(struct sigaction *actp, int sig,
3113 siginfo_t *siginfo, void *context) {
3114 // Call the old signal handler
3115 if (actp->sa_handler == SIG_DFL) {
3116 // It's more reasonable to let jvm treat it as an unexpected exception
3117 // instead of taking the default action.
3118 return false;
3119 } else if (actp->sa_handler != SIG_IGN) {
3120 if ((actp->sa_flags & SA_NODEFER) == 0) {
3121 // automaticlly block the signal
3122 sigaddset(&(actp->sa_mask), sig);
3123 }
3124
3125 sa_handler_t hand;
3126 sa_sigaction_t sa;
3127 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3128 // retrieve the chained handler
3129 if (siginfo_flag_set) {
3130 sa = actp->sa_sigaction;
3131 } else {
3132 hand = actp->sa_handler;
3133 }
3134
3135 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3136 actp->sa_handler = SIG_DFL;
3137 }
3138
3139 // try to honor the signal mask
3140 sigset_t oset;
3141 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3142
3143 // call into the chained handler
3144 if (siginfo_flag_set) {
3145 (*sa)(sig, siginfo, context);
3146 } else {
3147 (*hand)(sig);
3148 }
3149
3150 // restore the signal mask
3151 pthread_sigmask(SIG_SETMASK, &oset, 0);
3152 }
3153 // Tell jvm's signal handler the signal is taken care of.
3154 return true;
3155 }
3156
3157 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3158 bool chained = false;
3159 // signal-chaining
3160 if (UseSignalChaining) {
3161 struct sigaction *actp = get_chained_signal_action(sig);
3162 if (actp != NULL) {
3163 chained = call_chained_handler(actp, sig, siginfo, context);
3164 }
3165 }
3166 return chained;
3167 }
3168
3169 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
3170 if ((( (unsigned int)1 << sig ) & sigs) != 0) {
3171 return &sigact[sig];
3172 }
3173 return NULL;
3174 }
3175
3176 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3177 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3178 sigact[sig] = oldAct;
3179 sigs |= (unsigned int)1 << sig;
3180 }
3181
3182 // for diagnostic
3183 int os::Bsd::sigflags[MAXSIGNUM];
3184
3185 int os::Bsd::get_our_sigflags(int sig) {
3186 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3187 return sigflags[sig];
3188 }
3189
3190 void os::Bsd::set_our_sigflags(int sig, int flags) {
3191 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3192 sigflags[sig] = flags;
3193 }
3194
3195 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3196 // Check for overwrite.
3197 struct sigaction oldAct;
3198 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3199
3200 void* oldhand = oldAct.sa_sigaction
3201 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3202 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3203 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3204 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3205 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3206 if (AllowUserSignalHandlers || !set_installed) {
3207 // Do not overwrite; user takes responsibility to forward to us.
3208 return;
3209 } else if (UseSignalChaining) {
3210 // save the old handler in jvm
3211 save_preinstalled_handler(sig, oldAct);
3212 // libjsig also interposes the sigaction() call below and saves the
3213 // old sigaction on it own.
3214 } else {
3215 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3216 "%#lx for signal %d.", (long)oldhand, sig));
3217 }
3218 }
3219
3220 struct sigaction sigAct;
3221 sigfillset(&(sigAct.sa_mask));
3222 sigAct.sa_handler = SIG_DFL;
3223 if (!set_installed) {
3224 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3225 } else {
3226 sigAct.sa_sigaction = signalHandler;
3227 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3228 }
3229 #ifdef __APPLE__
3230 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3231 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3232 // if the signal handler declares it will handle it on alternate stack.
3233 // Notice we only declare we will handle it on alt stack, but we are not
3234 // actually going to use real alt stack - this is just a workaround.
3235 // Please see ux_exception.c, method catch_mach_exception_raise for details
3236 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3237 if (sig == SIGSEGV) {
3238 sigAct.sa_flags |= SA_ONSTACK;
3239 }
3240 #endif
3241
3242 // Save flags, which are set by ours
3243 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3244 sigflags[sig] = sigAct.sa_flags;
3245
3246 int ret = sigaction(sig, &sigAct, &oldAct);
3247 assert(ret == 0, "check");
3248
3249 void* oldhand2 = oldAct.sa_sigaction
3250 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3251 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3252 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3253 }
3254
3255 // install signal handlers for signals that HotSpot needs to
3256 // handle in order to support Java-level exception handling.
3257
3258 void os::Bsd::install_signal_handlers() {
3259 if (!signal_handlers_are_installed) {
3260 signal_handlers_are_installed = true;
3261
3262 // signal-chaining
3263 typedef void (*signal_setting_t)();
3264 signal_setting_t begin_signal_setting = NULL;
3265 signal_setting_t end_signal_setting = NULL;
3266 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3267 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3268 if (begin_signal_setting != NULL) {
3269 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3270 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3271 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3272 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3273 libjsig_is_loaded = true;
3274 assert(UseSignalChaining, "should enable signal-chaining");
3275 }
3276 if (libjsig_is_loaded) {
3277 // Tell libjsig jvm is setting signal handlers
3278 (*begin_signal_setting)();
3279 }
3280
3281 set_signal_handler(SIGSEGV, true);
3282 set_signal_handler(SIGPIPE, true);
3283 set_signal_handler(SIGBUS, true);
3284 set_signal_handler(SIGILL, true);
3285 set_signal_handler(SIGFPE, true);
3286 set_signal_handler(SIGXFSZ, true);
3287
3288 #if defined(__APPLE__)
3289 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3290 // signals caught and handled by the JVM. To work around this, we reset the mach task
3291 // signal handler that's placed on our process by CrashReporter. This disables
3292 // CrashReporter-based reporting.
3293 //
3294 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3295 // on caught fatal signals.
3296 //
3297 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3298 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3299 // exception handling, while leaving the standard BSD signal handlers functional.
3300 kern_return_t kr;
3301 kr = task_set_exception_ports(mach_task_self(),
3302 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3303 MACH_PORT_NULL,
3304 EXCEPTION_STATE_IDENTITY,
3305 MACHINE_THREAD_STATE);
3306
3307 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3308 #endif
3309
3310 if (libjsig_is_loaded) {
3311 // Tell libjsig jvm finishes setting signal handlers
3312 (*end_signal_setting)();
3313 }
3314
3315 // We don't activate signal checker if libjsig is in place, we trust ourselves
3316 // and if UserSignalHandler is installed all bets are off
3317 if (CheckJNICalls) {
3318 if (libjsig_is_loaded) {
3319 if (PrintJNIResolving) {
3320 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3321 }
3322 check_signals = false;
3323 }
3324 if (AllowUserSignalHandlers) {
3325 if (PrintJNIResolving) {
3326 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3327 }
3328 check_signals = false;
3329 }
3330 }
3331 }
3332 }
3333
3334
3335 /////
3336 // glibc on Bsd platform uses non-documented flag
3337 // to indicate, that some special sort of signal
3338 // trampoline is used.
3339 // We will never set this flag, and we should
3340 // ignore this flag in our diagnostic
3341 #ifdef SIGNIFICANT_SIGNAL_MASK
3342 #undef SIGNIFICANT_SIGNAL_MASK
3343 #endif
3344 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3345
3346 static const char* get_signal_handler_name(address handler,
3347 char* buf, int buflen) {
3348 int offset;
3349 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3350 if (found) {
3351 // skip directory names
3352 const char *p1, *p2;
3353 p1 = buf;
3354 size_t len = strlen(os::file_separator());
3355 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3356 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3357 } else {
3358 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3359 }
3360 return buf;
3361 }
3362
3363 static void print_signal_handler(outputStream* st, int sig,
3364 char* buf, size_t buflen) {
3365 struct sigaction sa;
3366
3367 sigaction(sig, NULL, &sa);
3368
3369 // See comment for SIGNIFICANT_SIGNAL_MASK define
3370 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3371
3372 st->print("%s: ", os::exception_name(sig, buf, buflen));
3373
3374 address handler = (sa.sa_flags & SA_SIGINFO)
3375 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3376 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3377
3378 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3379 st->print("SIG_DFL");
3380 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3381 st->print("SIG_IGN");
3382 } else {
3383 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3384 }
3385
3386 st->print(", sa_mask[0]=");
3387 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3388
3389 address rh = VMError::get_resetted_sighandler(sig);
3390 // May be, handler was resetted by VMError?
3391 if(rh != NULL) {
3392 handler = rh;
3393 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3394 }
3395
3396 st->print(", sa_flags=");
3397 os::Posix::print_sa_flags(st, sa.sa_flags);
3398
3399 // Check: is it our handler?
3400 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3401 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3402 // It is our signal handler
3403 // check for flags, reset system-used one!
3404 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3405 st->print(
3406 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3407 os::Bsd::get_our_sigflags(sig));
3408 }
3409 }
3410 st->cr();
3411 }
3412
3413
3414 #define DO_SIGNAL_CHECK(sig) \
3415 if (!sigismember(&check_signal_done, sig)) \
3416 os::Bsd::check_signal_handler(sig)
3417
3418 // This method is a periodic task to check for misbehaving JNI applications
3419 // under CheckJNI, we can add any periodic checks here
3420
3421 void os::run_periodic_checks() {
3422
3423 if (check_signals == false) return;
3424
3425 // SEGV and BUS if overridden could potentially prevent
3426 // generation of hs*.log in the event of a crash, debugging
3427 // such a case can be very challenging, so we absolutely
3428 // check the following for a good measure:
3429 DO_SIGNAL_CHECK(SIGSEGV);
3430 DO_SIGNAL_CHECK(SIGILL);
3431 DO_SIGNAL_CHECK(SIGFPE);
3432 DO_SIGNAL_CHECK(SIGBUS);
3433 DO_SIGNAL_CHECK(SIGPIPE);
3434 DO_SIGNAL_CHECK(SIGXFSZ);
3435
3436
3437 // ReduceSignalUsage allows the user to override these handlers
3438 // see comments at the very top and jvm_solaris.h
3439 if (!ReduceSignalUsage) {
3440 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3441 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3442 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3443 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3444 }
3445
3446 DO_SIGNAL_CHECK(SR_signum);
3447 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3448 }
3449
3450 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3451
3452 static os_sigaction_t os_sigaction = NULL;
3453
3454 void os::Bsd::check_signal_handler(int sig) {
3455 char buf[O_BUFLEN];
3456 address jvmHandler = NULL;
3457
3458
3459 struct sigaction act;
3460 if (os_sigaction == NULL) {
3461 // only trust the default sigaction, in case it has been interposed
3462 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3463 if (os_sigaction == NULL) return;
3464 }
3465
3466 os_sigaction(sig, (struct sigaction*)NULL, &act);
3467
3468
3469 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3470
3471 address thisHandler = (act.sa_flags & SA_SIGINFO)
3472 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3473 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
3474
3475
3476 switch(sig) {
3477 case SIGSEGV:
3478 case SIGBUS:
3479 case SIGFPE:
3480 case SIGPIPE:
3481 case SIGILL:
3482 case SIGXFSZ:
3483 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3484 break;
3485
3486 case SHUTDOWN1_SIGNAL:
3487 case SHUTDOWN2_SIGNAL:
3488 case SHUTDOWN3_SIGNAL:
3489 case BREAK_SIGNAL:
3490 jvmHandler = (address)user_handler();
3491 break;
3492
3493 case INTERRUPT_SIGNAL:
3494 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3495 break;
3496
3497 default:
3498 if (sig == SR_signum) {
3499 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3500 } else {
3501 return;
3502 }
3503 break;
3504 }
3505
3506 if (thisHandler != jvmHandler) {
3507 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3508 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3509 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3510 // No need to check this sig any longer
3511 sigaddset(&check_signal_done, sig);
3512 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3513 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3514 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig));
3515 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3516 // No need to check this sig any longer
3517 sigaddset(&check_signal_done, sig);
3518 }
3519
3520 // Dump all the signal
3521 if (sigismember(&check_signal_done, sig)) {
3522 print_signal_handlers(tty, buf, O_BUFLEN);
3523 }
3524 }
3525
3526 extern void report_error(char* file_name, int line_no, char* title, char* format, ...);
3527
3528 extern bool signal_name(int signo, char* buf, size_t len);
3529
3530 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3531 if (0 < exception_code && exception_code <= SIGRTMAX) {
3532 // signal
3533 if (!signal_name(exception_code, buf, size)) {
3534 jio_snprintf(buf, size, "SIG%d", exception_code);
3535 }
3536 return buf;
3537 } else {
3538 return NULL;
3539 }
3540 }
3541
3542 // this is called _before_ the most of global arguments have been parsed
3543 void os::init(void) {
3544 char dummy; /* used to get a guess on initial stack address */
3545 // first_hrtime = gethrtime();
3546
3547 // With BsdThreads the JavaMain thread pid (primordial thread)
3548 // is different than the pid of the java launcher thread.
3549 // So, on Bsd, the launcher thread pid is passed to the VM
3550 // via the sun.java.launcher.pid property.
3551 // Use this property instead of getpid() if it was correctly passed.
3552 // See bug 6351349.
3553 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3554
3555 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3556
3557 clock_tics_per_sec = CLK_TCK;
3558
3559 init_random(1234567);
3560
3561 ThreadCritical::initialize();
3562
3563 Bsd::set_page_size(getpagesize());
3564 if (Bsd::page_size() == -1) {
3565 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)",
3566 strerror(errno)));
3567 }
3568 init_page_sizes((size_t) Bsd::page_size());
3569
3570 Bsd::initialize_system_info();
3571
3572 // main_thread points to the aboriginal thread
3573 Bsd::_main_thread = pthread_self();
3574
3575 Bsd::clock_init();
3576 initial_time_count = javaTimeNanos();
3577
3578 #ifdef __APPLE__
3579 // XXXDARWIN
3580 // Work around the unaligned VM callbacks in hotspot's
3581 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3582 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3583 // alignment when doing symbol lookup. To work around this, we force early
3584 // binding of all symbols now, thus binding when alignment is known-good.
3585 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3586 #endif
3587 }
3588
3589 // To install functions for atexit system call
3590 extern "C" {
3591 static void perfMemory_exit_helper() {
3592 perfMemory_exit();
3593 }
3594 }
3595
3596 // this is called _after_ the global arguments have been parsed
3597 jint os::init_2(void)
3598 {
3599 // Allocate a single page and mark it as readable for safepoint polling
3600 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3601 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" );
3602
3603 os::set_polling_page( polling_page );
3604
3605 #ifndef PRODUCT
3606 if(Verbose && PrintMiscellaneous)
3607 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3608 #endif
3609
3610 if (!UseMembar) {
3611 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3612 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page");
3613 os::set_memory_serialize_page( mem_serialize_page );
3614
3615 #ifndef PRODUCT
3616 if(Verbose && PrintMiscellaneous)
3617 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3618 #endif
3619 }
3620
3621 // initialize suspend/resume support - must do this before signal_sets_init()
3622 if (SR_initialize() != 0) {
3623 perror("SR_initialize failed");
3624 return JNI_ERR;
3625 }
3626
3627 Bsd::signal_sets_init();
3628 Bsd::install_signal_handlers();
3629
3630 // Check minimum allowable stack size for thread creation and to initialize
3631 // the java system classes, including StackOverflowError - depends on page
3632 // size. Add a page for compiler2 recursion in main thread.
3633 // Add in 2*BytesPerWord times page size to account for VM stack during
3634 // class initialization depending on 32 or 64 bit VM.
3635 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
3636 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3637 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
3638
3639 size_t threadStackSizeInBytes = ThreadStackSize * K;
3640 if (threadStackSizeInBytes != 0 &&
3641 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
3642 tty->print_cr("\nThe stack size specified is too small, "
3643 "Specify at least %dk",
3644 os::Bsd::min_stack_allowed/ K);
3645 return JNI_ERR;
3646 }
3647
3648 // Make the stack size a multiple of the page size so that
3649 // the yellow/red zones can be guarded.
3650 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
3651 vm_page_size()));
3652
3653 if (MaxFDLimit) {
3654 // set the number of file descriptors to max. print out error
3655 // if getrlimit/setrlimit fails but continue regardless.
3656 struct rlimit nbr_files;
3657 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3658 if (status != 0) {
3659 if (PrintMiscellaneous && (Verbose || WizardMode))
3660 perror("os::init_2 getrlimit failed");
3661 } else {
3662 nbr_files.rlim_cur = nbr_files.rlim_max;
3663
3664 #ifdef __APPLE__
3665 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3666 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3667 // be used instead
3668 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3669 #endif
3670
3671 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3672 if (status != 0) {
3673 if (PrintMiscellaneous && (Verbose || WizardMode))
3674 perror("os::init_2 setrlimit failed");
3675 }
3676 }
3677 }
3678
3679 // at-exit methods are called in the reverse order of their registration.
3680 // atexit functions are called on return from main or as a result of a
3681 // call to exit(3C). There can be only 32 of these functions registered
3682 // and atexit() does not set errno.
3683
3684 if (PerfAllowAtExitRegistration) {
3685 // only register atexit functions if PerfAllowAtExitRegistration is set.
3686 // atexit functions can be delayed until process exit time, which
3687 // can be problematic for embedded VM situations. Embedded VMs should
3688 // call DestroyJavaVM() to assure that VM resources are released.
3689
3690 // note: perfMemory_exit_helper atexit function may be removed in
3691 // the future if the appropriate cleanup code can be added to the
3692 // VM_Exit VMOperation's doit method.
3693 if (atexit(perfMemory_exit_helper) != 0) {
3694 warning("os::init2 atexit(perfMemory_exit_helper) failed");
3695 }
3696 }
3697
3698 // initialize thread priority policy
3699 prio_init();
3700
3701 #ifdef __APPLE__
3702 // dynamically link to objective c gc registration
3703 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3704 if (handleLibObjc != NULL) {
3705 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3706 }
3707 #endif
3708
3709 return JNI_OK;
3710 }
3711
3712 // this is called at the end of vm_initialization
3713 void os::init_3(void) { }
3714
3715 // Mark the polling page as unreadable
3716 void os::make_polling_page_unreadable(void) {
3717 if( !guard_memory((char*)_polling_page, Bsd::page_size()) )
3718 fatal("Could not disable polling page");
3719 };
3720
3721 // Mark the polling page as readable
3722 void os::make_polling_page_readable(void) {
3723 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3724 fatal("Could not enable polling page");
3725 }
3726 };
3727
3728 int os::active_processor_count() {
3729 return _processor_count;
3730 }
3731
3732 void os::set_native_thread_name(const char *name) {
3733 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3734 // This is only supported in Snow Leopard and beyond
3735 if (name != NULL) {
3736 // Add a "Java: " prefix to the name
3737 char buf[MAXTHREADNAMESIZE];
3738 snprintf(buf, sizeof(buf), "Java: %s", name);
3739 pthread_setname_np(buf);
3740 }
3741 #endif
3742 }
3743
3744 bool os::distribute_processes(uint length, uint* distribution) {
3745 // Not yet implemented.
3746 return false;
3747 }
3748
3749 bool os::bind_to_processor(uint processor_id) {
3750 // Not yet implemented.
3751 return false;
3752 }
3753
3754 void os::SuspendedThreadTask::internal_do_task() {
3755 if (do_suspend(_thread->osthread())) {
3756 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3757 do_task(context);
3758 do_resume(_thread->osthread());
3759 }
3760 }
3761
3762 ///
3763 class PcFetcher : public os::SuspendedThreadTask {
3764 public:
3765 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3766 ExtendedPC result();
3767 protected:
3768 void do_task(const os::SuspendedThreadTaskContext& context);
3769 private:
3770 ExtendedPC _epc;
3771 };
3772
3773 ExtendedPC PcFetcher::result() {
3774 guarantee(is_done(), "task is not done yet.");
3775 return _epc;
3776 }
3777
3778 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3779 Thread* thread = context.thread();
3780 OSThread* osthread = thread->osthread();
3781 if (osthread->ucontext() != NULL) {
3782 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext());
3783 } else {
3784 // NULL context is unexpected, double-check this is the VMThread
3785 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3786 }
3787 }
3788
3789 // Suspends the target using the signal mechanism and then grabs the PC before
3790 // resuming the target. Used by the flat-profiler only
3791 ExtendedPC os::get_thread_pc(Thread* thread) {
3792 // Make sure that it is called by the watcher for the VMThread
3793 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3794 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3795
3796 PcFetcher fetcher(thread);
3797 fetcher.run();
3798 return fetcher.result();
3799 }
3800
3801 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime)
3802 {
3803 return pthread_cond_timedwait(_cond, _mutex, _abstime);
3804 }
3805
3806 ////////////////////////////////////////////////////////////////////////////////
3807 // debug support
3808
3809 bool os::find(address addr, outputStream* st) {
3810 Dl_info dlinfo;
3811 memset(&dlinfo, 0, sizeof(dlinfo));
3812 if (dladdr(addr, &dlinfo) != 0) {
3813 st->print(PTR_FORMAT ": ", addr);
3814 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3815 st->print("%s+%#x", dlinfo.dli_sname,
3816 addr - (intptr_t)dlinfo.dli_saddr);
3817 } else if (dlinfo.dli_fbase != NULL) {
3818 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
3819 } else {
3820 st->print("<absolute address>");
3821 }
3822 if (dlinfo.dli_fname != NULL) {
3823 st->print(" in %s", dlinfo.dli_fname);
3824 }
3825 if (dlinfo.dli_fbase != NULL) {
3826 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
3827 }
3828 st->cr();
3829
3830 if (Verbose) {
3831 // decode some bytes around the PC
3832 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3833 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3834 address lowest = (address) dlinfo.dli_sname;
3835 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3836 if (begin < lowest) begin = lowest;
3837 Dl_info dlinfo2;
3838 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3839 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
3840 end = (address) dlinfo2.dli_saddr;
3841 Disassembler::decode(begin, end, st);
3842 }
3843 return true;
3844 }
3845 return false;
3846 }
3847
3848 ////////////////////////////////////////////////////////////////////////////////
3849 // misc
3850
3851 // This does not do anything on Bsd. This is basically a hook for being
3852 // able to use structured exception handling (thread-local exception filters)
3853 // on, e.g., Win32.
3854 void
3855 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3856 JavaCallArguments* args, Thread* thread) {
3857 f(value, method, args, thread);
3858 }
3859
3860 void os::print_statistics() {
3861 }
3862
3863 int os::message_box(const char* title, const char* message) {
3864 int i;
3865 fdStream err(defaultStream::error_fd());
3866 for (i = 0; i < 78; i++) err.print_raw("=");
3867 err.cr();
3868 err.print_raw_cr(title);
3869 for (i = 0; i < 78; i++) err.print_raw("-");
3870 err.cr();
3871 err.print_raw_cr(message);
3872 for (i = 0; i < 78; i++) err.print_raw("=");
3873 err.cr();
3874
3875 char buf[16];
3876 // Prevent process from exiting upon "read error" without consuming all CPU
3877 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3878
3879 return buf[0] == 'y' || buf[0] == 'Y';
3880 }
3881
3882 int os::stat(const char *path, struct stat *sbuf) {
3883 char pathbuf[MAX_PATH];
3884 if (strlen(path) > MAX_PATH - 1) {
3885 errno = ENAMETOOLONG;
3886 return -1;
3887 }
3888 os::native_path(strcpy(pathbuf, path));
3889 return ::stat(pathbuf, sbuf);
3890 }
3891
3892 bool os::check_heap(bool force) {
3893 return true;
3894 }
3895
3896 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
3897 return ::vsnprintf(buf, count, format, args);
3898 }
3899
3900 // Is a (classpath) directory empty?
3901 bool os::dir_is_empty(const char* path) {
3902 DIR *dir = NULL;
3903 struct dirent *ptr;
3904
3905 dir = opendir(path);
3906 if (dir == NULL) return true;
3907
3908 /* Scan the directory */
3909 bool result = true;
3910 char buf[sizeof(struct dirent) + MAX_PATH];
3911 while (result && (ptr = ::readdir(dir)) != NULL) {
3912 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3913 result = false;
3914 }
3915 }
3916 closedir(dir);
3917 return result;
3918 }
3919
3920 // This code originates from JDK's sysOpen and open64_w
3921 // from src/solaris/hpi/src/system_md.c
3922
3923 #ifndef O_DELETE
3924 #define O_DELETE 0x10000
3925 #endif
3926
3927 // Open a file. Unlink the file immediately after open returns
3928 // if the specified oflag has the O_DELETE flag set.
3929 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
3930
3931 int os::open(const char *path, int oflag, int mode) {
3932
3933 if (strlen(path) > MAX_PATH - 1) {
3934 errno = ENAMETOOLONG;
3935 return -1;
3936 }
3937 int fd;
3938 int o_delete = (oflag & O_DELETE);
3939 oflag = oflag & ~O_DELETE;
3940
3941 fd = ::open(path, oflag, mode);
3942 if (fd == -1) return -1;
3943
3944 //If the open succeeded, the file might still be a directory
3945 {
3946 struct stat buf;
3947 int ret = ::fstat(fd, &buf);
3948 int st_mode = buf.st_mode;
3949
3950 if (ret != -1) {
3951 if ((st_mode & S_IFMT) == S_IFDIR) {
3952 errno = EISDIR;
3953 ::close(fd);
3954 return -1;
3955 }
3956 } else {
3957 ::close(fd);
3958 return -1;
3959 }
3960 }
3961
3962 /*
3963 * All file descriptors that are opened in the JVM and not
3964 * specifically destined for a subprocess should have the
3965 * close-on-exec flag set. If we don't set it, then careless 3rd
3966 * party native code might fork and exec without closing all
3967 * appropriate file descriptors (e.g. as we do in closeDescriptors in
3968 * UNIXProcess.c), and this in turn might:
3969 *
3970 * - cause end-of-file to fail to be detected on some file
3971 * descriptors, resulting in mysterious hangs, or
3972 *
3973 * - might cause an fopen in the subprocess to fail on a system
3974 * suffering from bug 1085341.
3975 *
3976 * (Yes, the default setting of the close-on-exec flag is a Unix
3977 * design flaw)
3978 *
3979 * See:
3980 * 1085341: 32-bit stdio routines should support file descriptors >255
3981 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3982 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3983 */
3984 #ifdef FD_CLOEXEC
3985 {
3986 int flags = ::fcntl(fd, F_GETFD);
3987 if (flags != -1)
3988 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3989 }
3990 #endif
3991
3992 if (o_delete != 0) {
3993 ::unlink(path);
3994 }
3995 return fd;
3996 }
3997
3998
3999 // create binary file, rewriting existing file if required
4000 int os::create_binary_file(const char* path, bool rewrite_existing) {
4001 int oflags = O_WRONLY | O_CREAT;
4002 if (!rewrite_existing) {
4003 oflags |= O_EXCL;
4004 }
4005 return ::open(path, oflags, S_IREAD | S_IWRITE);
4006 }
4007
4008 // return current position of file pointer
4009 jlong os::current_file_offset(int fd) {
4010 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
4011 }
4012
4013 // move file pointer to the specified offset
4014 jlong os::seek_to_file_offset(int fd, jlong offset) {
4015 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
4016 }
4017
4018 // This code originates from JDK's sysAvailable
4019 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4020
4021 int os::available(int fd, jlong *bytes) {
4022 jlong cur, end;
4023 int mode;
4024 struct stat buf;
4025
4026 if (::fstat(fd, &buf) >= 0) {
4027 mode = buf.st_mode;
4028 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4029 /*
4030 * XXX: is the following call interruptible? If so, this might
4031 * need to go through the INTERRUPT_IO() wrapper as for other
4032 * blocking, interruptible calls in this file.
4033 */
4034 int n;
4035 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4036 *bytes = n;
4037 return 1;
4038 }
4039 }
4040 }
4041 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
4042 return 0;
4043 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
4044 return 0;
4045 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
4046 return 0;
4047 }
4048 *bytes = end - cur;
4049 return 1;
4050 }
4051
4052 int os::socket_available(int fd, jint *pbytes) {
4053 if (fd < 0)
4054 return OS_OK;
4055
4056 int ret;
4057
4058 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
4059
4060 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
4061 // is expected to return 0 on failure and 1 on success to the jdk.
4062
4063 return (ret == OS_ERR) ? 0 : 1;
4064 }
4065
4066 // Map a block of memory.
4067 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4068 char *addr, size_t bytes, bool read_only,
4069 bool allow_exec) {
4070 int prot;
4071 int flags;
4072
4073 if (read_only) {
4074 prot = PROT_READ;
4075 flags = MAP_SHARED;
4076 } else {
4077 prot = PROT_READ | PROT_WRITE;
4078 flags = MAP_PRIVATE;
4079 }
4080
4081 if (allow_exec) {
4082 prot |= PROT_EXEC;
4083 }
4084
4085 if (addr != NULL) {
4086 flags |= MAP_FIXED;
4087 }
4088
4089 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4090 fd, file_offset);
4091 if (mapped_address == MAP_FAILED) {
4092 return NULL;
4093 }
4094 return mapped_address;
4095 }
4096
4097
4098 // Remap a block of memory.
4099 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4100 char *addr, size_t bytes, bool read_only,
4101 bool allow_exec) {
4102 // same as map_memory() on this OS
4103 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4104 allow_exec);
4105 }
4106
4107
4108 // Unmap a block of memory.
4109 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4110 return munmap(addr, bytes) == 0;
4111 }
4112
4113 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4114 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4115 // of a thread.
4116 //
4117 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4118 // the fast estimate available on the platform.
4119
4120 jlong os::current_thread_cpu_time() {
4121 #ifdef __APPLE__
4122 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
4123 #else
4124 Unimplemented();
4125 return 0;
4126 #endif
4127 }
4128
4129 jlong os::thread_cpu_time(Thread* thread) {
4130 #ifdef __APPLE__
4131 return os::thread_cpu_time(thread, true /* user + sys */);
4132 #else
4133 Unimplemented();
4134 return 0;
4135 #endif
4136 }
4137
4138 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4139 #ifdef __APPLE__
4140 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4141 #else
4142 Unimplemented();
4143 return 0;
4144 #endif
4145 }
4146
4147 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4148 #ifdef __APPLE__
4149 struct thread_basic_info tinfo;
4150 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
4151 kern_return_t kr;
4152 thread_t mach_thread;
4153
4154 mach_thread = thread->osthread()->thread_id();
4155 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
4156 if (kr != KERN_SUCCESS)
4157 return -1;
4158
4159 if (user_sys_cpu_time) {
4160 jlong nanos;
4161 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
4162 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
4163 return nanos;
4164 } else {
4165 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
4166 }
4167 #else
4168 Unimplemented();
4169 return 0;
4170 #endif
4171 }
4172
4173
4174 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4175 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4176 info_ptr->may_skip_backward = false; // elapsed time not wall time
4177 info_ptr->may_skip_forward = false; // elapsed time not wall time
4178 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4179 }
4180
4181 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4182 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4183 info_ptr->may_skip_backward = false; // elapsed time not wall time
4184 info_ptr->may_skip_forward = false; // elapsed time not wall time
4185 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4186 }
4187
4188 bool os::is_thread_cpu_time_supported() {
4189 #ifdef __APPLE__
4190 return true;
4191 #else
4192 return false;
4193 #endif
4194 }
4195
4196 // System loadavg support. Returns -1 if load average cannot be obtained.
4197 // Bsd doesn't yet have a (official) notion of processor sets,
4198 // so just return the system wide load average.
4199 int os::loadavg(double loadavg[], int nelem) {
4200 return ::getloadavg(loadavg, nelem);
4201 }
4202
4203 void os::pause() {
4204 char filename[MAX_PATH];
4205 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4206 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4207 } else {
4208 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4209 }
4210
4211 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4212 if (fd != -1) {
4213 struct stat buf;
4214 ::close(fd);
4215 while (::stat(filename, &buf) == 0) {
4216 (void)::poll(NULL, 0, 100);
4217 }
4218 } else {
4219 jio_fprintf(stderr,
4220 "Could not open pause file '%s', continuing immediately.\n", filename);
4221 }
4222 }
4223
4224
4225 // Refer to the comments in os_solaris.cpp park-unpark.
4226 //
4227 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4228 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4229 // For specifics regarding the bug see GLIBC BUGID 261237 :
4230 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4231 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4232 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4233 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4234 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4235 // and monitorenter when we're using 1-0 locking. All those operations may result in
4236 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4237 // of libpthread avoids the problem, but isn't practical.
4238 //
4239 // Possible remedies:
4240 //
4241 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4242 // This is palliative and probabilistic, however. If the thread is preempted
4243 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4244 // than the minimum period may have passed, and the abstime may be stale (in the
4245 // past) resultin in a hang. Using this technique reduces the odds of a hang
4246 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4247 //
4248 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4249 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4250 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4251 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4252 // thread.
4253 //
4254 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4255 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4256 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4257 // This also works well. In fact it avoids kernel-level scalability impediments
4258 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4259 // timers in a graceful fashion.
4260 //
4261 // 4. When the abstime value is in the past it appears that control returns
4262 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4263 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4264 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4265 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4266 // It may be possible to avoid reinitialization by checking the return
4267 // value from pthread_cond_timedwait(). In addition to reinitializing the
4268 // condvar we must establish the invariant that cond_signal() is only called
4269 // within critical sections protected by the adjunct mutex. This prevents
4270 // cond_signal() from "seeing" a condvar that's in the midst of being
4271 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4272 // desirable signal-after-unlock optimization that avoids futile context switching.
4273 //
4274 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4275 // structure when a condvar is used or initialized. cond_destroy() would
4276 // release the helper structure. Our reinitialize-after-timedwait fix
4277 // put excessive stress on malloc/free and locks protecting the c-heap.
4278 //
4279 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4280 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4281 // and only enabling the work-around for vulnerable environments.
4282
4283 // utility to compute the abstime argument to timedwait:
4284 // millis is the relative timeout time
4285 // abstime will be the absolute timeout time
4286 // TODO: replace compute_abstime() with unpackTime()
4287
4288 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) {
4289 if (millis < 0) millis = 0;
4290 struct timeval now;
4291 int status = gettimeofday(&now, NULL);
4292 assert(status == 0, "gettimeofday");
4293 jlong seconds = millis / 1000;
4294 millis %= 1000;
4295 if (seconds > 50000000) { // see man cond_timedwait(3T)
4296 seconds = 50000000;
4297 }
4298 abstime->tv_sec = now.tv_sec + seconds;
4299 long usec = now.tv_usec + millis * 1000;
4300 if (usec >= 1000000) {
4301 abstime->tv_sec += 1;
4302 usec -= 1000000;
4303 }
4304 abstime->tv_nsec = usec * 1000;
4305 return abstime;
4306 }
4307
4308
4309 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4310 // Conceptually TryPark() should be equivalent to park(0).
4311
4312 int os::PlatformEvent::TryPark() {
4313 for (;;) {
4314 const int v = _Event ;
4315 guarantee ((v == 0) || (v == 1), "invariant") ;
4316 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
4317 }
4318 }
4319
4320 void os::PlatformEvent::park() { // AKA "down()"
4321 // Invariant: Only the thread associated with the Event/PlatformEvent
4322 // may call park().
4323 // TODO: assert that _Assoc != NULL or _Assoc == Self
4324 int v ;
4325 for (;;) {
4326 v = _Event ;
4327 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4328 }
4329 guarantee (v >= 0, "invariant") ;
4330 if (v == 0) {
4331 // Do this the hard way by blocking ...
4332 int status = pthread_mutex_lock(_mutex);
4333 assert_status(status == 0, status, "mutex_lock");
4334 guarantee (_nParked == 0, "invariant") ;
4335 ++ _nParked ;
4336 while (_Event < 0) {
4337 status = pthread_cond_wait(_cond, _mutex);
4338 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4339 // Treat this the same as if the wait was interrupted
4340 if (status == ETIMEDOUT) { status = EINTR; }
4341 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4342 }
4343 -- _nParked ;
4344
4345 _Event = 0 ;
4346 status = pthread_mutex_unlock(_mutex);
4347 assert_status(status == 0, status, "mutex_unlock");
4348 // Paranoia to ensure our locked and lock-free paths interact
4349 // correctly with each other.
4350 OrderAccess::fence();
4351 }
4352 guarantee (_Event >= 0, "invariant") ;
4353 }
4354
4355 int os::PlatformEvent::park(jlong millis) {
4356 guarantee (_nParked == 0, "invariant") ;
4357
4358 int v ;
4359 for (;;) {
4360 v = _Event ;
4361 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4362 }
4363 guarantee (v >= 0, "invariant") ;
4364 if (v != 0) return OS_OK ;
4365
4366 // We do this the hard way, by blocking the thread.
4367 // Consider enforcing a minimum timeout value.
4368 struct timespec abst;
4369 compute_abstime(&abst, millis);
4370
4371 int ret = OS_TIMEOUT;
4372 int status = pthread_mutex_lock(_mutex);
4373 assert_status(status == 0, status, "mutex_lock");
4374 guarantee (_nParked == 0, "invariant") ;
4375 ++_nParked ;
4376
4377 // Object.wait(timo) will return because of
4378 // (a) notification
4379 // (b) timeout
4380 // (c) thread.interrupt
4381 //
4382 // Thread.interrupt and object.notify{All} both call Event::set.
4383 // That is, we treat thread.interrupt as a special case of notification.
4384 // The underlying Solaris implementation, cond_timedwait, admits
4385 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4386 // JVM from making those visible to Java code. As such, we must
4387 // filter out spurious wakeups. We assume all ETIME returns are valid.
4388 //
4389 // TODO: properly differentiate simultaneous notify+interrupt.
4390 // In that case, we should propagate the notify to another waiter.
4391
4392 while (_Event < 0) {
4393 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst);
4394 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4395 pthread_cond_destroy (_cond);
4396 pthread_cond_init (_cond, NULL) ;
4397 }
4398 assert_status(status == 0 || status == EINTR ||
4399 status == ETIMEDOUT,
4400 status, "cond_timedwait");
4401 if (!FilterSpuriousWakeups) break ; // previous semantics
4402 if (status == ETIMEDOUT) break ;
4403 // We consume and ignore EINTR and spurious wakeups.
4404 }
4405 --_nParked ;
4406 if (_Event >= 0) {
4407 ret = OS_OK;
4408 }
4409 _Event = 0 ;
4410 status = pthread_mutex_unlock(_mutex);
4411 assert_status(status == 0, status, "mutex_unlock");
4412 assert (_nParked == 0, "invariant") ;
4413 // Paranoia to ensure our locked and lock-free paths interact
4414 // correctly with each other.
4415 OrderAccess::fence();
4416 return ret;
4417 }
4418
4419 void os::PlatformEvent::unpark() {
4420 // Transitions for _Event:
4421 // 0 :=> 1
4422 // 1 :=> 1
4423 // -1 :=> either 0 or 1; must signal target thread
4424 // That is, we can safely transition _Event from -1 to either
4425 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4426 // unpark() calls.
4427 // See also: "Semaphores in Plan 9" by Mullender & Cox
4428 //
4429 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4430 // that it will take two back-to-back park() calls for the owning
4431 // thread to block. This has the benefit of forcing a spurious return
4432 // from the first park() call after an unpark() call which will help
4433 // shake out uses of park() and unpark() without condition variables.
4434
4435 if (Atomic::xchg(1, &_Event) >= 0) return;
4436
4437 // Wait for the thread associated with the event to vacate
4438 int status = pthread_mutex_lock(_mutex);
4439 assert_status(status == 0, status, "mutex_lock");
4440 int AnyWaiters = _nParked;
4441 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4442 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) {
4443 AnyWaiters = 0;
4444 pthread_cond_signal(_cond);
4445 }
4446 status = pthread_mutex_unlock(_mutex);
4447 assert_status(status == 0, status, "mutex_unlock");
4448 if (AnyWaiters != 0) {
4449 status = pthread_cond_signal(_cond);
4450 assert_status(status == 0, status, "cond_signal");
4451 }
4452
4453 // Note that we signal() _after dropping the lock for "immortal" Events.
4454 // This is safe and avoids a common class of futile wakeups. In rare
4455 // circumstances this can cause a thread to return prematurely from
4456 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4457 // simply re-test the condition and re-park itself.
4458 }
4459
4460
4461 // JSR166
4462 // -------------------------------------------------------
4463
4464 /*
4465 * The solaris and bsd implementations of park/unpark are fairly
4466 * conservative for now, but can be improved. They currently use a
4467 * mutex/condvar pair, plus a a count.
4468 * Park decrements count if > 0, else does a condvar wait. Unpark
4469 * sets count to 1 and signals condvar. Only one thread ever waits
4470 * on the condvar. Contention seen when trying to park implies that someone
4471 * is unparking you, so don't wait. And spurious returns are fine, so there
4472 * is no need to track notifications.
4473 */
4474
4475 #define MAX_SECS 100000000
4476 /*
4477 * This code is common to bsd and solaris and will be moved to a
4478 * common place in dolphin.
4479 *
4480 * The passed in time value is either a relative time in nanoseconds
4481 * or an absolute time in milliseconds. Either way it has to be unpacked
4482 * into suitable seconds and nanoseconds components and stored in the
4483 * given timespec structure.
4484 * Given time is a 64-bit value and the time_t used in the timespec is only
4485 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for
4486 * overflow if times way in the future are given. Further on Solaris versions
4487 * prior to 10 there is a restriction (see cond_timedwait) that the specified
4488 * number of seconds, in abstime, is less than current_time + 100,000,000.
4489 * As it will be 28 years before "now + 100000000" will overflow we can
4490 * ignore overflow and just impose a hard-limit on seconds using the value
4491 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
4492 * years from "now".
4493 */
4494
4495 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
4496 assert (time > 0, "convertTime");
4497
4498 struct timeval now;
4499 int status = gettimeofday(&now, NULL);
4500 assert(status == 0, "gettimeofday");
4501
4502 time_t max_secs = now.tv_sec + MAX_SECS;
4503
4504 if (isAbsolute) {
4505 jlong secs = time / 1000;
4506 if (secs > max_secs) {
4507 absTime->tv_sec = max_secs;
4508 }
4509 else {
4510 absTime->tv_sec = secs;
4511 }
4512 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4513 }
4514 else {
4515 jlong secs = time / NANOSECS_PER_SEC;
4516 if (secs >= MAX_SECS) {
4517 absTime->tv_sec = max_secs;
4518 absTime->tv_nsec = 0;
4519 }
4520 else {
4521 absTime->tv_sec = now.tv_sec + secs;
4522 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4523 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4524 absTime->tv_nsec -= NANOSECS_PER_SEC;
4525 ++absTime->tv_sec; // note: this must be <= max_secs
4526 }
4527 }
4528 }
4529 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4530 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4531 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4532 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4533 }
4534
4535 void Parker::park(bool isAbsolute, jlong time) {
4536 // Ideally we'd do something useful while spinning, such
4537 // as calling unpackTime().
4538
4539 // Optional fast-path check:
4540 // Return immediately if a permit is available.
4541 // We depend on Atomic::xchg() having full barrier semantics
4542 // since we are doing a lock-free update to _counter.
4543 if (Atomic::xchg(0, &_counter) > 0) return;
4544
4545 Thread* thread = Thread::current();
4546 assert(thread->is_Java_thread(), "Must be JavaThread");
4547 JavaThread *jt = (JavaThread *)thread;
4548
4549 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4550 // Check interrupt before trying to wait
4551 if (Thread::is_interrupted(thread, false)) {
4552 return;
4553 }
4554
4555 // Next, demultiplex/decode time arguments
4556 struct timespec absTime;
4557 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
4558 return;
4559 }
4560 if (time > 0) {
4561 unpackTime(&absTime, isAbsolute, time);
4562 }
4563
4564
4565 // Enter safepoint region
4566 // Beware of deadlocks such as 6317397.
4567 // The per-thread Parker:: mutex is a classic leaf-lock.
4568 // In particular a thread must never block on the Threads_lock while
4569 // holding the Parker:: mutex. If safepoints are pending both the
4570 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4571 ThreadBlockInVM tbivm(jt);
4572
4573 // Don't wait if cannot get lock since interference arises from
4574 // unblocking. Also. check interrupt before trying wait
4575 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4576 return;
4577 }
4578
4579 int status ;
4580 if (_counter > 0) { // no wait needed
4581 _counter = 0;
4582 status = pthread_mutex_unlock(_mutex);
4583 assert (status == 0, "invariant") ;
4584 // Paranoia to ensure our locked and lock-free paths interact
4585 // correctly with each other and Java-level accesses.
4586 OrderAccess::fence();
4587 return;
4588 }
4589
4590 #ifdef ASSERT
4591 // Don't catch signals while blocked; let the running threads have the signals.
4592 // (This allows a debugger to break into the running thread.)
4593 sigset_t oldsigs;
4594 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
4595 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4596 #endif
4597
4598 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4599 jt->set_suspend_equivalent();
4600 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4601
4602 if (time == 0) {
4603 status = pthread_cond_wait (_cond, _mutex) ;
4604 } else {
4605 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ;
4606 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4607 pthread_cond_destroy (_cond) ;
4608 pthread_cond_init (_cond, NULL);
4609 }
4610 }
4611 assert_status(status == 0 || status == EINTR ||
4612 status == ETIMEDOUT,
4613 status, "cond_timedwait");
4614
4615 #ifdef ASSERT
4616 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4617 #endif
4618
4619 _counter = 0 ;
4620 status = pthread_mutex_unlock(_mutex) ;
4621 assert_status(status == 0, status, "invariant") ;
4622 // Paranoia to ensure our locked and lock-free paths interact
4623 // correctly with each other and Java-level accesses.
4624 OrderAccess::fence();
4625
4626 // If externally suspended while waiting, re-suspend
4627 if (jt->handle_special_suspend_equivalent_condition()) {
4628 jt->java_suspend_self();
4629 }
4630 }
4631
4632 void Parker::unpark() {
4633 int s, status ;
4634 status = pthread_mutex_lock(_mutex);
4635 assert (status == 0, "invariant") ;
4636 s = _counter;
4637 _counter = 1;
4638 if (s < 1) {
4639 if (WorkAroundNPTLTimedWaitHang) {
4640 status = pthread_cond_signal (_cond) ;
4641 assert (status == 0, "invariant") ;
4642 status = pthread_mutex_unlock(_mutex);
4643 assert (status == 0, "invariant") ;
4644 } else {
4645 status = pthread_mutex_unlock(_mutex);
4646 assert (status == 0, "invariant") ;
4647 status = pthread_cond_signal (_cond) ;
4648 assert (status == 0, "invariant") ;
4649 }
4650 } else {
4651 pthread_mutex_unlock(_mutex);
4652 assert (status == 0, "invariant") ;
4653 }
4654 }
4655
4656
4657 /* Darwin has no "environ" in a dynamic library. */
4658 #ifdef __APPLE__
4659 #include <crt_externs.h>
4660 #define environ (*_NSGetEnviron())
4661 #else
4662 extern char** environ;
4663 #endif
4664
4665 // Run the specified command in a separate process. Return its exit value,
4666 // or -1 on failure (e.g. can't fork a new process).
4667 // Unlike system(), this function can be called from signal handler. It
4668 // doesn't block SIGINT et al.
4669 int os::fork_and_exec(char* cmd) {
4670 const char * argv[4] = {"sh", "-c", cmd, NULL};
4671
4672 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
4673 // pthread_atfork handlers and reset pthread library. All we need is a
4674 // separate process to execve. Make a direct syscall to fork process.
4675 // On IA64 there's no fork syscall, we have to use fork() and hope for
4676 // the best...
4677 pid_t pid = fork();
4678
4679 if (pid < 0) {
4680 // fork failed
4681 return -1;
4682
4683 } else if (pid == 0) {
4684 // child process
4685
4686 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4687 // first to kill every thread on the thread list. Because this list is
4688 // not reset by fork() (see notes above), execve() will instead kill
4689 // every thread in the parent process. We know this is the only thread
4690 // in the new process, so make a system call directly.
4691 // IA64 should use normal execve() from glibc to match the glibc fork()
4692 // above.
4693 execve("/bin/sh", (char* const*)argv, environ);
4694
4695 // execve failed
4696 _exit(-1);
4697
4698 } else {
4699 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4700 // care about the actual exit code, for now.
4701
4702 int status;
4703
4704 // Wait for the child process to exit. This returns immediately if
4705 // the child has already exited. */
4706 while (waitpid(pid, &status, 0) < 0) {
4707 switch (errno) {
4708 case ECHILD: return 0;
4709 case EINTR: break;
4710 default: return -1;
4711 }
4712 }
4713
4714 if (WIFEXITED(status)) {
4715 // The child exited normally; get its exit code.
4716 return WEXITSTATUS(status);
4717 } else if (WIFSIGNALED(status)) {
4718 // The child exited because of a signal
4719 // The best value to return is 0x80 + signal number,
4720 // because that is what all Unix shells do, and because
4721 // it allows callers to distinguish between process exit and
4722 // process death by signal.
4723 return 0x80 + WTERMSIG(status);
4724 } else {
4725 // Unknown exit code; pass it through
4726 return status;
4727 }
4728 }
4729 }
4730
4731 // is_headless_jre()
4732 //
4733 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4734 // in order to report if we are running in a headless jre
4735 //
4736 // Since JDK8 xawt/libmawt.so was moved into the same directory
4737 // as libawt.so, and renamed libawt_xawt.so
4738 //
4739 bool os::is_headless_jre() {
4740 #ifdef __APPLE__
4741 // We no longer build headless-only on Mac OS X
4742 return false;
4743 #else
4744 struct stat statbuf;
4745 char buf[MAXPATHLEN];
4746 char libmawtpath[MAXPATHLEN];
4747 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4748 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4749 char *p;
4750
4751 // Get path to libjvm.so
4752 os::jvm_path(buf, sizeof(buf));
4753
4754 // Get rid of libjvm.so
4755 p = strrchr(buf, '/');
4756 if (p == NULL) return false;
4757 else *p = '\0';
4758
4759 // Get rid of client or server
4760 p = strrchr(buf, '/');
4761 if (p == NULL) return false;
4762 else *p = '\0';
4763
4764 // check xawt/libmawt.so
4765 strcpy(libmawtpath, buf);
4766 strcat(libmawtpath, xawtstr);
4767 if (::stat(libmawtpath, &statbuf) == 0) return false;
4768
4769 // check libawt_xawt.so
4770 strcpy(libmawtpath, buf);
4771 strcat(libmawtpath, new_xawtstr);
4772 if (::stat(libmawtpath, &statbuf) == 0) return false;
4773
4774 return true;
4775 #endif
4776 }
4777
4778 // Get the default path to the core file
4779 // Returns the length of the string
4780 int os::get_core_path(char* buffer, size_t bufferSize) {
4781 int n = jio_snprintf(buffer, bufferSize, "/cores");
4782
4783 // Truncate if theoretical string was longer than bufferSize
4784 n = MIN2(n, (int)bufferSize);
4785
4786 return n;
4787 }
4788
4789 #ifndef PRODUCT
4790 void TestReserveMemorySpecial_test() {
4791 // No tests available for this platform
4792 }
4793 #endif