1 /*
2 * Copyright (c) 1999, 2020, 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 "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_bsd.inline.hpp"
41 #include "os_posix.inline.hpp"
42 #include "os_share_bsd.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/semaphore.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/vmError.hpp"
72
73 // put OS-includes here
74 # include <dlfcn.h>
75 # include <errno.h>
76 # include <fcntl.h>
77 # include <inttypes.h>
78 # include <poll.h>
79 # include <pthread.h>
80 # include <pwd.h>
81 # include <signal.h>
82 # include <stdint.h>
83 # include <stdio.h>
84 # include <string.h>
85 # include <sys/ioctl.h>
86 # include <sys/mman.h>
87 # include <sys/param.h>
88 # include <sys/resource.h>
89 # include <sys/socket.h>
90 # include <sys/stat.h>
91 # include <sys/syscall.h>
92 # include <sys/sysctl.h>
93 # include <sys/time.h>
94 # include <sys/times.h>
95 # include <sys/types.h>
96 # include <sys/wait.h>
97 # include <time.h>
98 # include <unistd.h>
99
100 #if defined(__FreeBSD__) || defined(__NetBSD__)
101 #include <elf.h>
102 #endif
103
104 #ifdef __APPLE__
105 #include <mach-o/dyld.h>
106 #endif
107
108 #ifndef MAP_ANONYMOUS
109 #define MAP_ANONYMOUS MAP_ANON
110 #endif
111
112 #define MAX_PATH (2 * K)
113
114 // for timer info max values which include all bits
115 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
116
117 ////////////////////////////////////////////////////////////////////////////////
118 // global variables
119 julong os::Bsd::_physical_memory = 0;
120
121 #ifdef __APPLE__
122 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
123 volatile uint64_t os::Bsd::_max_abstime = 0;
124 #else
125 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
126 #endif
127 pthread_t os::Bsd::_main_thread;
128 int os::Bsd::_page_size = -1;
129
130 static jlong initial_time_count=0;
131
132 static int clock_tics_per_sec = 100;
133
134 // For diagnostics to print a message once. see run_periodic_checks
135 static sigset_t check_signal_done;
136 static bool check_signals = true;
137
138 // Signal number used to suspend/resume a thread
139
140 // do not use any signal number less than SIGSEGV, see 4355769
141 static int SR_signum = SIGUSR2;
142 sigset_t SR_sigset;
143
144 #ifdef __APPLE__
145 static const int processor_id_unassigned = -1;
146 static const int processor_id_assigning = -2;
147 static const int processor_id_map_size = 256;
148 static volatile int processor_id_map[processor_id_map_size];
149 static volatile int processor_id_next = 0;
150 #endif
151
152 ////////////////////////////////////////////////////////////////////////////////
153 // utility functions
154
155 static int SR_initialize();
156
157 julong os::available_memory() {
158 return Bsd::available_memory();
159 }
160
161 // available here means free
162 julong os::Bsd::available_memory() {
163 uint64_t available = physical_memory() >> 2;
164 #ifdef __APPLE__
165 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
166 vm_statistics64_data_t vmstat;
167 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
168 (host_info64_t)&vmstat, &count);
169 assert(kerr == KERN_SUCCESS,
170 "host_statistics64 failed - check mach_host_self() and count");
171 if (kerr == KERN_SUCCESS) {
172 available = vmstat.free_count * os::vm_page_size();
173 }
174 #endif
175 return available;
176 }
177
178 // for more info see :
179 // https://man.openbsd.org/sysctl.2
180 void os::Bsd::print_uptime_info(outputStream* st) {
181 struct timeval boottime;
182 size_t len = sizeof(boottime);
183 int mib[2];
184 mib[0] = CTL_KERN;
185 mib[1] = KERN_BOOTTIME;
186
187 if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
188 time_t bootsec = boottime.tv_sec;
189 time_t currsec = time(NULL);
190 os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
191 }
192 }
193
194 julong os::physical_memory() {
195 return Bsd::physical_memory();
196 }
197
198 // Return true if user is running as root.
199
200 bool os::have_special_privileges() {
201 static bool init = false;
202 static bool privileges = false;
203 if (!init) {
204 privileges = (getuid() != geteuid()) || (getgid() != getegid());
205 init = true;
206 }
207 return privileges;
208 }
209
210
211
212 // Cpu architecture string
213 #if defined(ZERO)
214 static char cpu_arch[] = ZERO_LIBARCH;
215 #elif defined(IA64)
216 static char cpu_arch[] = "ia64";
217 #elif defined(IA32)
218 static char cpu_arch[] = "i386";
219 #elif defined(AMD64)
220 static char cpu_arch[] = "amd64";
221 #elif defined(ARM)
222 static char cpu_arch[] = "arm";
223 #elif defined(PPC32)
224 static char cpu_arch[] = "ppc";
225 #else
226 #error Add appropriate cpu_arch setting
227 #endif
228
229 // Compiler variant
230 #ifdef COMPILER2
231 #define COMPILER_VARIANT "server"
232 #else
233 #define COMPILER_VARIANT "client"
234 #endif
235
236
237 void os::Bsd::initialize_system_info() {
238 int mib[2];
239 size_t len;
240 int cpu_val;
241 julong mem_val;
242
243 // get processors count via hw.ncpus sysctl
244 mib[0] = CTL_HW;
245 mib[1] = HW_NCPU;
246 len = sizeof(cpu_val);
247 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
248 assert(len == sizeof(cpu_val), "unexpected data size");
249 set_processor_count(cpu_val);
250 } else {
251 set_processor_count(1); // fallback
252 }
253
254 #ifdef __APPLE__
255 // initialize processor id map
256 for (int i = 0; i < processor_id_map_size; i++) {
257 processor_id_map[i] = processor_id_unassigned;
258 }
259 #endif
260
261 // get physical memory via hw.memsize sysctl (hw.memsize is used
262 // since it returns a 64 bit value)
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 #ifndef OVERRIDE_LIBPATH
343 #define DEFAULT_LIBPATH "/lib:/usr/lib"
344 #else
345 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
346 #endif
347 #endif
348
349 // Base path of extensions installed on the system.
350 #define SYS_EXT_DIR "/usr/java/packages"
351 #define EXTENSIONS_DIR "/lib/ext"
352
353 #ifndef __APPLE__
354
355 // Buffer that fits several sprintfs.
356 // Note that the space for the colon and the trailing null are provided
357 // by the nulls included by the sizeof operator.
358 const size_t bufsize =
359 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
360 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
361 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
362
363 // sysclasspath, java_home, dll_dir
364 {
365 char *pslash;
366 os::jvm_path(buf, bufsize);
367
368 // Found the full path to libjvm.so.
369 // Now cut the path to <java_home>/jre if we can.
370 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
371 pslash = strrchr(buf, '/');
372 if (pslash != NULL) {
373 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
374 }
375 Arguments::set_dll_dir(buf);
376
377 if (pslash != NULL) {
378 pslash = strrchr(buf, '/');
379 if (pslash != NULL) {
380 *pslash = '\0'; // Get rid of /<arch>.
381 pslash = strrchr(buf, '/');
382 if (pslash != NULL) {
383 *pslash = '\0'; // Get rid of /lib.
384 }
385 }
386 }
387 Arguments::set_java_home(buf);
388 if (!set_boot_path('/', ':')) {
389 vm_exit_during_initialization("Failed setting boot class path.", NULL);
390 }
391 }
392
393 // Where to look for native libraries.
394 //
395 // Note: Due to a legacy implementation, most of the library path
396 // is set in the launcher. This was to accomodate linking restrictions
397 // on legacy Bsd implementations (which are no longer supported).
398 // Eventually, all the library path setting will be done here.
399 //
400 // However, to prevent the proliferation of improperly built native
401 // libraries, the new path component /usr/java/packages is added here.
402 // Eventually, all the library path setting will be done here.
403 {
404 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
405 // should always exist (until the legacy problem cited above is
406 // addressed).
407 const char *v = ::getenv("LD_LIBRARY_PATH");
408 const char *v_colon = ":";
409 if (v == NULL) { v = ""; v_colon = ""; }
410 // That's +1 for the colon and +1 for the trailing '\0'.
411 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
412 strlen(v) + 1 +
413 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
414 mtInternal);
415 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
416 Arguments::set_library_path(ld_library_path);
417 FREE_C_HEAP_ARRAY(char, ld_library_path);
418 }
419
420 // Extensions directories.
421 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
422 Arguments::set_ext_dirs(buf);
423
424 FREE_C_HEAP_ARRAY(char, buf);
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 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
441 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
442 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
443
444 // sysclasspath, java_home, dll_dir
445 {
446 char *pslash;
447 os::jvm_path(buf, bufsize);
448
449 // Found the full path to libjvm.so.
450 // Now cut the path to <java_home>/jre if we can.
451 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
452 pslash = strrchr(buf, '/');
453 if (pslash != NULL) {
454 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
455 }
456 #ifdef STATIC_BUILD
457 strcat(buf, "/lib");
458 #endif
459
460 Arguments::set_dll_dir(buf);
461
462 if (pslash != NULL) {
463 pslash = strrchr(buf, '/');
464 if (pslash != NULL) {
465 *pslash = '\0'; // Get rid of /lib.
466 }
467 }
468 Arguments::set_java_home(buf);
469 set_boot_path('/', ':');
470 }
471
472 // Where to look for native libraries.
473 //
474 // Note: Due to a legacy implementation, most of the library path
475 // is set in the launcher. This was to accomodate linking restrictions
476 // on legacy Bsd implementations (which are no longer supported).
477 // Eventually, all the library path setting will be done here.
478 //
479 // However, to prevent the proliferation of improperly built native
480 // libraries, the new path component /usr/java/packages is added here.
481 // Eventually, all the library path setting will be done here.
482 {
483 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
484 // should always exist (until the legacy problem cited above is
485 // addressed).
486 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
487 // can specify a directory inside an app wrapper
488 const char *l = ::getenv("JAVA_LIBRARY_PATH");
489 const char *l_colon = ":";
490 if (l == NULL) { l = ""; l_colon = ""; }
491
492 const char *v = ::getenv("DYLD_LIBRARY_PATH");
493 const char *v_colon = ":";
494 if (v == NULL) { v = ""; v_colon = ""; }
495
496 // Apple's Java6 has "." at the beginning of java.library.path.
497 // OpenJDK on Windows has "." at the end of java.library.path.
498 // OpenJDK on Linux and Solaris don't have "." in java.library.path
499 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
500 // "." is appended to the end of java.library.path. Yes, this
501 // could cause a change in behavior, but Apple's Java6 behavior
502 // can be achieved by putting "." at the beginning of the
503 // JAVA_LIBRARY_PATH environment variable.
504 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
505 strlen(v) + 1 + strlen(l) + 1 +
506 system_ext_size + 3,
507 mtInternal);
508 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
509 v, v_colon, l, l_colon, user_home_dir);
510 Arguments::set_library_path(ld_library_path);
511 FREE_C_HEAP_ARRAY(char, ld_library_path);
512 }
513
514 // Extensions directories.
515 //
516 // Note that the space for the colon and the trailing null are provided
517 // by the nulls included by the sizeof operator (so actually one byte more
518 // than necessary is allocated).
519 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
520 user_home_dir, Arguments::get_java_home());
521 Arguments::set_ext_dirs(buf);
522
523 FREE_C_HEAP_ARRAY(char, buf);
524
525 #undef SYS_EXTENSIONS_DIR
526 #undef SYS_EXTENSIONS_DIRS
527
528 #endif // __APPLE__
529
530 #undef SYS_EXT_DIR
531 #undef EXTENSIONS_DIR
532 }
533
534 ////////////////////////////////////////////////////////////////////////////////
535 // breakpoint support
536
537 void os::breakpoint() {
538 BREAKPOINT;
539 }
540
541 extern "C" void breakpoint() {
542 // use debugger to set breakpoint here
543 }
544
545 ////////////////////////////////////////////////////////////////////////////////
546 // signal support
547
548 debug_only(static bool signal_sets_initialized = false);
549 static sigset_t unblocked_sigs, vm_sigs;
550
551 void os::Bsd::signal_sets_init() {
552 // Should also have an assertion stating we are still single-threaded.
553 assert(!signal_sets_initialized, "Already initialized");
554 // Fill in signals that are necessarily unblocked for all threads in
555 // the VM. Currently, we unblock the following signals:
556 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
557 // by -Xrs (=ReduceSignalUsage));
558 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
559 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
560 // the dispositions or masks wrt these signals.
561 // Programs embedding the VM that want to use the above signals for their
562 // own purposes must, at this time, use the "-Xrs" option to prevent
563 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
564 // (See bug 4345157, and other related bugs).
565 // In reality, though, unblocking these signals is really a nop, since
566 // these signals are not blocked by default.
567 sigemptyset(&unblocked_sigs);
568 sigaddset(&unblocked_sigs, SIGILL);
569 sigaddset(&unblocked_sigs, SIGSEGV);
570 sigaddset(&unblocked_sigs, SIGBUS);
571 sigaddset(&unblocked_sigs, SIGFPE);
572 sigaddset(&unblocked_sigs, SR_signum);
573
574 if (!ReduceSignalUsage) {
575 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
576 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
577
578 }
579 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
580 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
581 }
582 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
583 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
584 }
585 }
586 // Fill in signals that are blocked by all but the VM thread.
587 sigemptyset(&vm_sigs);
588 if (!ReduceSignalUsage) {
589 sigaddset(&vm_sigs, BREAK_SIGNAL);
590 }
591 debug_only(signal_sets_initialized = true);
592
593 }
594
595 // These are signals that are unblocked while a thread is running Java.
596 // (For some reason, they get blocked by default.)
597 sigset_t* os::Bsd::unblocked_signals() {
598 assert(signal_sets_initialized, "Not initialized");
599 return &unblocked_sigs;
600 }
601
602 // These are the signals that are blocked while a (non-VM) thread is
603 // running Java. Only the VM thread handles these signals.
604 sigset_t* os::Bsd::vm_signals() {
605 assert(signal_sets_initialized, "Not initialized");
606 return &vm_sigs;
607 }
608
609 void os::Bsd::hotspot_sigmask(Thread* thread) {
610
611 //Save caller's signal mask before setting VM signal mask
612 sigset_t caller_sigmask;
613 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
614
615 OSThread* osthread = thread->osthread();
616 osthread->set_caller_sigmask(caller_sigmask);
617
618 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
619
620 if (!ReduceSignalUsage) {
621 if (thread->is_VM_thread()) {
622 // Only the VM thread handles BREAK_SIGNAL ...
623 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
624 } else {
625 // ... all other threads block BREAK_SIGNAL
626 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
627 }
628 }
629 }
630
631
632 //////////////////////////////////////////////////////////////////////////////
633 // create new thread
634
635 #ifdef __APPLE__
636 // library handle for calling objc_registerThreadWithCollector()
637 // without static linking to the libobjc library
638 #define OBJC_LIB "/usr/lib/libobjc.dylib"
639 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
640 typedef void (*objc_registerThreadWithCollector_t)();
641 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
642 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
643 #endif
644
645 // Thread start routine for all newly created threads
646 static void *thread_native_entry(Thread *thread) {
647
648 thread->record_stack_base_and_size();
649
650 // Try to randomize the cache line index of hot stack frames.
651 // This helps when threads of the same stack traces evict each other's
652 // cache lines. The threads can be either from the same JVM instance, or
653 // from different JVM instances. The benefit is especially true for
654 // processors with hyperthreading technology.
655 static int counter = 0;
656 int pid = os::current_process_id();
657 alloca(((pid ^ counter++) & 7) * 128);
658
659 thread->initialize_thread_current();
660
661 OSThread* osthread = thread->osthread();
662 Monitor* sync = osthread->startThread_lock();
663
664 osthread->set_thread_id(os::Bsd::gettid());
665
666 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
667 os::current_thread_id(), (uintx) pthread_self());
668
669 #ifdef __APPLE__
670 // Store unique OS X thread id used by SA
671 osthread->set_unique_thread_id();
672 #endif
673
674 // initialize signal mask for this thread
675 os::Bsd::hotspot_sigmask(thread);
676
677 // initialize floating point control register
678 os::Bsd::init_thread_fpu_state();
679
680 #ifdef __APPLE__
681 // register thread with objc gc
682 if (objc_registerThreadWithCollectorFunction != NULL) {
683 objc_registerThreadWithCollectorFunction();
684 }
685 #endif
686
687 // handshaking with parent thread
688 {
689 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
690
691 // notify parent thread
692 osthread->set_state(INITIALIZED);
693 sync->notify_all();
694
695 // wait until os::start_thread()
696 while (osthread->get_state() == INITIALIZED) {
697 sync->wait_without_safepoint_check();
698 }
699 }
700
701 // call one more level start routine
702 thread->call_run();
703
704 // Note: at this point the thread object may already have deleted itself.
705 // Prevent dereferencing it from here on out.
706 thread = NULL;
707
708 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
709 os::current_thread_id(), (uintx) pthread_self());
710
711 return 0;
712 }
713
714 bool os::create_thread(Thread* thread, ThreadType thr_type,
715 size_t req_stack_size) {
716 assert(thread->osthread() == NULL, "caller responsible");
717
718 // Allocate the OSThread object
719 OSThread* osthread = new OSThread(NULL, NULL);
720 if (osthread == NULL) {
721 return false;
722 }
723
724 // set the correct thread state
725 osthread->set_thread_type(thr_type);
726
727 // Initial state is ALLOCATED but not INITIALIZED
728 osthread->set_state(ALLOCATED);
729
730 thread->set_osthread(osthread);
731
732 // init thread attributes
733 pthread_attr_t attr;
734 pthread_attr_init(&attr);
735 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
736
737 // calculate stack size if it's not specified by caller
738 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
739 int status = pthread_attr_setstacksize(&attr, stack_size);
740 assert_status(status == 0, status, "pthread_attr_setstacksize");
741
742 ThreadState state;
743
744 {
745 pthread_t tid;
746 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
747
748 char buf[64];
749 if (ret == 0) {
750 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
751 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
752 } else {
753 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
754 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
755 // Log some OS information which might explain why creating the thread failed.
756 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
757 LogStream st(Log(os, thread)::info());
758 os::Posix::print_rlimit_info(&st);
759 os::print_memory_info(&st);
760 }
761
762 pthread_attr_destroy(&attr);
763
764 if (ret != 0) {
765 // Need to clean up stuff we've allocated so far
766 thread->set_osthread(NULL);
767 delete osthread;
768 return false;
769 }
770
771 // Store pthread info into the OSThread
772 osthread->set_pthread_id(tid);
773
774 // Wait until child thread is either initialized or aborted
775 {
776 Monitor* sync_with_child = osthread->startThread_lock();
777 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
778 while ((state = osthread->get_state()) == ALLOCATED) {
779 sync_with_child->wait_without_safepoint_check();
780 }
781 }
782
783 }
784
785 // Aborted due to thread limit being reached
786 if (state == ZOMBIE) {
787 thread->set_osthread(NULL);
788 delete osthread;
789 return false;
790 }
791
792 // The thread is returned suspended (in state INITIALIZED),
793 // and is started higher up in the call chain
794 assert(state == INITIALIZED, "race condition");
795 return true;
796 }
797
798 /////////////////////////////////////////////////////////////////////////////
799 // attach existing thread
800
801 // bootstrap the main thread
802 bool os::create_main_thread(JavaThread* thread) {
803 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
804 return create_attached_thread(thread);
805 }
806
807 bool os::create_attached_thread(JavaThread* thread) {
808 #ifdef ASSERT
809 thread->verify_not_published();
810 #endif
811
812 // Allocate the OSThread object
813 OSThread* osthread = new OSThread(NULL, NULL);
814
815 if (osthread == NULL) {
816 return false;
817 }
818
819 osthread->set_thread_id(os::Bsd::gettid());
820
821 #ifdef __APPLE__
822 // Store unique OS X thread id used by SA
823 osthread->set_unique_thread_id();
824 #endif
825
826 // Store pthread info into the OSThread
827 osthread->set_pthread_id(::pthread_self());
828
829 // initialize floating point control register
830 os::Bsd::init_thread_fpu_state();
831
832 // Initial thread state is RUNNABLE
833 osthread->set_state(RUNNABLE);
834
835 thread->set_osthread(osthread);
836
837 // initialize signal mask for this thread
838 // and save the caller's signal mask
839 os::Bsd::hotspot_sigmask(thread);
840
841 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
842 os::current_thread_id(), (uintx) pthread_self());
843
844 return true;
845 }
846
847 void os::pd_start_thread(Thread* thread) {
848 OSThread * osthread = thread->osthread();
849 assert(osthread->get_state() != INITIALIZED, "just checking");
850 Monitor* sync_with_child = osthread->startThread_lock();
851 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
852 sync_with_child->notify();
853 }
854
855 // Free Bsd resources related to the OSThread
856 void os::free_thread(OSThread* osthread) {
857 assert(osthread != NULL, "osthread not set");
858
859 // We are told to free resources of the argument thread,
860 // but we can only really operate on the current thread.
861 assert(Thread::current()->osthread() == osthread,
862 "os::free_thread but not current thread");
863
864 // Restore caller's signal mask
865 sigset_t sigmask = osthread->caller_sigmask();
866 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
867
868 delete osthread;
869 }
870
871 ////////////////////////////////////////////////////////////////////////////////
872 // time support
873
874 // Time since start-up in seconds to a fine granularity.
875 // Used by VMSelfDestructTimer and the MemProfiler.
876 double os::elapsedTime() {
877
878 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
879 }
880
881 jlong os::elapsed_counter() {
882 return javaTimeNanos() - initial_time_count;
883 }
884
885 jlong os::elapsed_frequency() {
886 return NANOSECS_PER_SEC; // nanosecond resolution
887 }
888
889 bool os::supports_vtime() { return true; }
890
891 double os::elapsedVTime() {
892 // better than nothing, but not much
893 return elapsedTime();
894 }
895
896 jlong os::javaTimeMillis() {
897 timeval time;
898 int status = gettimeofday(&time, NULL);
899 assert(status != -1, "bsd error");
900 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
901 }
902
903 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
904 timeval time;
905 int status = gettimeofday(&time, NULL);
906 assert(status != -1, "bsd error");
907 seconds = jlong(time.tv_sec);
908 nanos = jlong(time.tv_usec) * 1000;
909 }
910
911 #ifndef __APPLE__
912 #ifndef CLOCK_MONOTONIC
913 #define CLOCK_MONOTONIC (1)
914 #endif
915 #endif
916
917 #ifdef __APPLE__
918 void os::Bsd::clock_init() {
919 mach_timebase_info(&_timebase_info);
920 }
921 #else
922 void os::Bsd::clock_init() {
923 struct timespec res;
924 struct timespec tp;
925 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
926 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
927 // yes, monotonic clock is supported
928 _clock_gettime = ::clock_gettime;
929 }
930 }
931 #endif
932
933
934
935 #ifdef __APPLE__
936
937 jlong os::javaTimeNanos() {
938 const uint64_t tm = mach_absolute_time();
939 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
940 const uint64_t prev = Bsd::_max_abstime;
941 if (now <= prev) {
942 return prev; // same or retrograde time;
943 }
944 const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now);
945 assert(obsv >= prev, "invariant"); // Monotonicity
946 // If the CAS succeeded then we're done and return "now".
947 // If the CAS failed and the observed value "obsv" is >= now then
948 // we should return "obsv". If the CAS failed and now > obsv > prv then
949 // some other thread raced this thread and installed a new value, in which case
950 // we could either (a) retry the entire operation, (b) retry trying to install now
951 // or (c) just return obsv. We use (c). No loop is required although in some cases
952 // we might discard a higher "now" value in deference to a slightly lower but freshly
953 // installed obsv value. That's entirely benign -- it admits no new orderings compared
954 // to (a) or (b) -- and greatly reduces coherence traffic.
955 // We might also condition (c) on the magnitude of the delta between obsv and now.
956 // Avoiding excessive CAS operations to hot RW locations is critical.
957 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
958 return (prev == obsv) ? now : obsv;
959 }
960
961 #else // __APPLE__
962
963 jlong os::javaTimeNanos() {
964 if (os::supports_monotonic_clock()) {
965 struct timespec tp;
966 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
967 assert(status == 0, "gettime error");
968 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
969 return result;
970 } else {
971 timeval time;
972 int status = gettimeofday(&time, NULL);
973 assert(status != -1, "bsd error");
974 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
975 return 1000 * usecs;
976 }
977 }
978
979 #endif // __APPLE__
980
981 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
982 if (os::supports_monotonic_clock()) {
983 info_ptr->max_value = ALL_64_BITS;
984
985 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
986 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
987 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
988 } else {
989 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
990 info_ptr->max_value = ALL_64_BITS;
991
992 // gettimeofday is a real time clock so it skips
993 info_ptr->may_skip_backward = true;
994 info_ptr->may_skip_forward = true;
995 }
996
997 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
998 }
999
1000 // Return the real, user, and system times in seconds from an
1001 // arbitrary fixed point in the past.
1002 bool os::getTimesSecs(double* process_real_time,
1003 double* process_user_time,
1004 double* process_system_time) {
1005 struct tms ticks;
1006 clock_t real_ticks = times(&ticks);
1007
1008 if (real_ticks == (clock_t) (-1)) {
1009 return false;
1010 } else {
1011 double ticks_per_second = (double) clock_tics_per_sec;
1012 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1013 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1014 *process_real_time = ((double) real_ticks) / ticks_per_second;
1015
1016 return true;
1017 }
1018 }
1019
1020
1021 char * os::local_time_string(char *buf, size_t buflen) {
1022 struct tm t;
1023 time_t long_time;
1024 time(&long_time);
1025 localtime_r(&long_time, &t);
1026 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1027 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1028 t.tm_hour, t.tm_min, t.tm_sec);
1029 return buf;
1030 }
1031
1032 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1033 return localtime_r(clock, res);
1034 }
1035
1036 ////////////////////////////////////////////////////////////////////////////////
1037 // runtime exit support
1038
1039 // Note: os::shutdown() might be called very early during initialization, or
1040 // called from signal handler. Before adding something to os::shutdown(), make
1041 // sure it is async-safe and can handle partially initialized VM.
1042 void os::shutdown() {
1043
1044 // allow PerfMemory to attempt cleanup of any persistent resources
1045 perfMemory_exit();
1046
1047 // needs to remove object in file system
1048 AttachListener::abort();
1049
1050 // flush buffered output, finish log files
1051 ostream_abort();
1052
1053 // Check for abort hook
1054 abort_hook_t abort_hook = Arguments::abort_hook();
1055 if (abort_hook != NULL) {
1056 abort_hook();
1057 }
1058
1059 }
1060
1061 // Note: os::abort() might be called very early during initialization, or
1062 // called from signal handler. Before adding something to os::abort(), make
1063 // sure it is async-safe and can handle partially initialized VM.
1064 void os::abort(bool dump_core, void* siginfo, const void* context) {
1065 os::shutdown();
1066 if (dump_core) {
1067 ::abort(); // dump core
1068 }
1069
1070 ::exit(1);
1071 }
1072
1073 // Die immediately, no exit hook, no abort hook, no cleanup.
1074 // Dump a core file, if possible, for debugging.
1075 void os::die() {
1076 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1077 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1078 // and don't take the time to generate a core file.
1079 os::signal_raise(SIGKILL);
1080 } else {
1081 // _exit() on BsdThreads only kills current thread
1082 ::abort();
1083 }
1084 }
1085
1086 // Information of current thread in variety of formats
1087 pid_t os::Bsd::gettid() {
1088 int retval = -1;
1089
1090 #ifdef __APPLE__ // XNU kernel
1091 mach_port_t port = mach_thread_self();
1092 guarantee(MACH_PORT_VALID(port), "just checking");
1093 mach_port_deallocate(mach_task_self(), port);
1094 return (pid_t)port;
1095
1096 #else
1097 #ifdef __FreeBSD__
1098 retval = syscall(SYS_thr_self);
1099 #else
1100 #ifdef __OpenBSD__
1101 retval = syscall(SYS_getthrid);
1102 #else
1103 #ifdef __NetBSD__
1104 retval = (pid_t) syscall(SYS__lwp_self);
1105 #endif
1106 #endif
1107 #endif
1108 #endif
1109
1110 if (retval == -1) {
1111 return getpid();
1112 }
1113 }
1114
1115 intx os::current_thread_id() {
1116 #ifdef __APPLE__
1117 return (intx)os::Bsd::gettid();
1118 #else
1119 return (intx)::pthread_self();
1120 #endif
1121 }
1122
1123 int os::current_process_id() {
1124 return (int)(getpid());
1125 }
1126
1127 // DLL functions
1128
1129 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1130
1131 // This must be hard coded because it's the system's temporary
1132 // directory not the java application's temp directory, ala java.io.tmpdir.
1133 #ifdef __APPLE__
1134 // macosx has a secure per-user temporary directory
1135 char temp_path_storage[PATH_MAX];
1136 const char* os::get_temp_directory() {
1137 static char *temp_path = NULL;
1138 if (temp_path == NULL) {
1139 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1140 if (pathSize == 0 || pathSize > PATH_MAX) {
1141 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1142 }
1143 temp_path = temp_path_storage;
1144 }
1145 return temp_path;
1146 }
1147 #else // __APPLE__
1148 const char* os::get_temp_directory() { return "/tmp"; }
1149 #endif // __APPLE__
1150
1151 // check if addr is inside libjvm.so
1152 bool os::address_is_in_vm(address addr) {
1153 static address libjvm_base_addr;
1154 Dl_info dlinfo;
1155
1156 if (libjvm_base_addr == NULL) {
1157 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1158 libjvm_base_addr = (address)dlinfo.dli_fbase;
1159 }
1160 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1161 }
1162
1163 if (dladdr((void *)addr, &dlinfo) != 0) {
1164 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1165 }
1166
1167 return false;
1168 }
1169
1170
1171 #define MACH_MAXSYMLEN 256
1172
1173 bool os::dll_address_to_function_name(address addr, char *buf,
1174 int buflen, int *offset,
1175 bool demangle) {
1176 // buf is not optional, but offset is optional
1177 assert(buf != NULL, "sanity check");
1178
1179 Dl_info dlinfo;
1180 char localbuf[MACH_MAXSYMLEN];
1181
1182 if (dladdr((void*)addr, &dlinfo) != 0) {
1183 // see if we have a matching symbol
1184 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1185 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1186 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1187 }
1188 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1189 return true;
1190 }
1191 // no matching symbol so try for just file info
1192 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1193 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1194 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1195 return true;
1196 }
1197 }
1198
1199 // Handle non-dynamic manually:
1200 if (dlinfo.dli_fbase != NULL &&
1201 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1202 dlinfo.dli_fbase)) {
1203 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1204 jio_snprintf(buf, buflen, "%s", localbuf);
1205 }
1206 return true;
1207 }
1208 }
1209 buf[0] = '\0';
1210 if (offset != NULL) *offset = -1;
1211 return false;
1212 }
1213
1214 // ported from solaris version
1215 bool os::dll_address_to_library_name(address addr, char* buf,
1216 int buflen, int* offset) {
1217 // buf is not optional, but offset is optional
1218 assert(buf != NULL, "sanity check");
1219
1220 Dl_info dlinfo;
1221
1222 if (dladdr((void*)addr, &dlinfo) != 0) {
1223 if (dlinfo.dli_fname != NULL) {
1224 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1225 }
1226 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1227 *offset = addr - (address)dlinfo.dli_fbase;
1228 }
1229 return true;
1230 }
1231
1232 buf[0] = '\0';
1233 if (offset) *offset = -1;
1234 return false;
1235 }
1236
1237 // Loads .dll/.so and
1238 // in case of error it checks if .dll/.so was built for the
1239 // same architecture as Hotspot is running on
1240
1241 #ifdef __APPLE__
1242 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1243 #ifdef STATIC_BUILD
1244 return os::get_default_process_handle();
1245 #else
1246 log_info(os)("attempting shared library load of %s", filename);
1247
1248 void * result= ::dlopen(filename, RTLD_LAZY);
1249 if (result != NULL) {
1250 Events::log(NULL, "Loaded shared library %s", filename);
1251 // Successful loading
1252 log_info(os)("shared library load of %s was successful", filename);
1253 return result;
1254 }
1255
1256 const char* error_report = ::dlerror();
1257 if (error_report == NULL) {
1258 error_report = "dlerror returned no error description";
1259 }
1260 if (ebuf != NULL && ebuflen > 0) {
1261 // Read system error message into ebuf
1262 ::strncpy(ebuf, error_report, ebuflen-1);
1263 ebuf[ebuflen-1]='\0';
1264 }
1265 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1266 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1267
1268 return NULL;
1269 #endif // STATIC_BUILD
1270 }
1271 #else
1272 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1273 #ifdef STATIC_BUILD
1274 return os::get_default_process_handle();
1275 #else
1276 log_info(os)("attempting shared library load of %s", filename);
1277 void * result= ::dlopen(filename, RTLD_LAZY);
1278 if (result != NULL) {
1279 Events::log(NULL, "Loaded shared library %s", filename);
1280 // Successful loading
1281 log_info(os)("shared library load of %s was successful", filename);
1282 return result;
1283 }
1284
1285 Elf32_Ehdr elf_head;
1286
1287 const char* const error_report = ::dlerror();
1288 if (error_report == NULL) {
1289 error_report = "dlerror returned no error description";
1290 }
1291 if (ebuf != NULL && ebuflen > 0) {
1292 // Read system error message into ebuf
1293 ::strncpy(ebuf, error_report, ebuflen-1);
1294 ebuf[ebuflen-1]='\0';
1295 }
1296 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1297 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1298
1299 int diag_msg_max_length=ebuflen-strlen(ebuf);
1300 char* diag_msg_buf=ebuf+strlen(ebuf);
1301
1302 if (diag_msg_max_length==0) {
1303 // No more space in ebuf for additional diagnostics message
1304 return NULL;
1305 }
1306
1307
1308 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1309
1310 if (file_descriptor < 0) {
1311 // Can't open library, report dlerror() message
1312 return NULL;
1313 }
1314
1315 bool failed_to_read_elf_head=
1316 (sizeof(elf_head)!=
1317 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1318
1319 ::close(file_descriptor);
1320 if (failed_to_read_elf_head) {
1321 // file i/o error - report dlerror() msg
1322 return NULL;
1323 }
1324
1325 typedef struct {
1326 Elf32_Half code; // Actual value as defined in elf.h
1327 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1328 char elf_class; // 32 or 64 bit
1329 char endianess; // MSB or LSB
1330 char* name; // String representation
1331 } arch_t;
1332
1333 #ifndef EM_486
1334 #define EM_486 6 /* Intel 80486 */
1335 #endif
1336
1337 #ifndef EM_MIPS_RS3_LE
1338 #define EM_MIPS_RS3_LE 10 /* MIPS */
1339 #endif
1340
1341 #ifndef EM_PPC64
1342 #define EM_PPC64 21 /* PowerPC64 */
1343 #endif
1344
1345 #ifndef EM_S390
1346 #define EM_S390 22 /* IBM System/390 */
1347 #endif
1348
1349 #ifndef EM_IA_64
1350 #define EM_IA_64 50 /* HP/Intel IA-64 */
1351 #endif
1352
1353 #ifndef EM_X86_64
1354 #define EM_X86_64 62 /* AMD x86-64 */
1355 #endif
1356
1357 static const arch_t arch_array[]={
1358 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1359 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1360 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1361 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1362 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1363 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1364 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1365 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1366 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1367 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1368 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1369 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1370 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1371 };
1372
1373 #if (defined IA32)
1374 static Elf32_Half running_arch_code=EM_386;
1375 #elif (defined AMD64)
1376 static Elf32_Half running_arch_code=EM_X86_64;
1377 #elif (defined IA64)
1378 static Elf32_Half running_arch_code=EM_IA_64;
1379 #elif (defined __powerpc64__)
1380 static Elf32_Half running_arch_code=EM_PPC64;
1381 #elif (defined __powerpc__)
1382 static Elf32_Half running_arch_code=EM_PPC;
1383 #elif (defined ARM)
1384 static Elf32_Half running_arch_code=EM_ARM;
1385 #elif (defined S390)
1386 static Elf32_Half running_arch_code=EM_S390;
1387 #elif (defined ALPHA)
1388 static Elf32_Half running_arch_code=EM_ALPHA;
1389 #elif (defined MIPSEL)
1390 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1391 #elif (defined PARISC)
1392 static Elf32_Half running_arch_code=EM_PARISC;
1393 #elif (defined MIPS)
1394 static Elf32_Half running_arch_code=EM_MIPS;
1395 #elif (defined M68K)
1396 static Elf32_Half running_arch_code=EM_68K;
1397 #else
1398 #error Method os::dll_load requires that one of following is defined:\
1399 IA32, AMD64, IA64, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1400 #endif
1401
1402 // Identify compatability class for VM's architecture and library's architecture
1403 // Obtain string descriptions for architectures
1404
1405 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1406 int running_arch_index=-1;
1407
1408 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1409 if (running_arch_code == arch_array[i].code) {
1410 running_arch_index = i;
1411 }
1412 if (lib_arch.code == arch_array[i].code) {
1413 lib_arch.compat_class = arch_array[i].compat_class;
1414 lib_arch.name = arch_array[i].name;
1415 }
1416 }
1417
1418 assert(running_arch_index != -1,
1419 "Didn't find running architecture code (running_arch_code) in arch_array");
1420 if (running_arch_index == -1) {
1421 // Even though running architecture detection failed
1422 // we may still continue with reporting dlerror() message
1423 return NULL;
1424 }
1425
1426 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1427 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1428 return NULL;
1429 }
1430
1431 #ifndef S390
1432 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1433 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1434 return NULL;
1435 }
1436 #endif // !S390
1437
1438 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1439 if (lib_arch.name!=NULL) {
1440 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1441 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1442 lib_arch.name, arch_array[running_arch_index].name);
1443 } else {
1444 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1445 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1446 lib_arch.code,
1447 arch_array[running_arch_index].name);
1448 }
1449 }
1450
1451 return NULL;
1452 #endif // STATIC_BUILD
1453 }
1454 #endif // !__APPLE__
1455
1456 void* os::get_default_process_handle() {
1457 #ifdef __APPLE__
1458 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1459 // to avoid finding unexpected symbols on second (or later)
1460 // loads of a library.
1461 return (void*)::dlopen(NULL, RTLD_FIRST);
1462 #else
1463 return (void*)::dlopen(NULL, RTLD_LAZY);
1464 #endif
1465 }
1466
1467 // XXX: Do we need a lock around this as per Linux?
1468 void* os::dll_lookup(void* handle, const char* name) {
1469 return dlsym(handle, name);
1470 }
1471
1472 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1473 outputStream * out = (outputStream *) param;
1474 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1475 return 0;
1476 }
1477
1478 void os::print_dll_info(outputStream *st) {
1479 st->print_cr("Dynamic libraries:");
1480 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1481 st->print_cr("Error: Cannot print dynamic libraries.");
1482 }
1483 }
1484
1485 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1486 #ifdef RTLD_DI_LINKMAP
1487 Dl_info dli;
1488 void *handle;
1489 Link_map *map;
1490 Link_map *p;
1491
1492 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1493 dli.dli_fname == NULL) {
1494 return 1;
1495 }
1496 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1497 if (handle == NULL) {
1498 return 1;
1499 }
1500 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1501 if (map == NULL) {
1502 dlclose(handle);
1503 return 1;
1504 }
1505
1506 while (map->l_prev != NULL)
1507 map = map->l_prev;
1508
1509 while (map != NULL) {
1510 // Value for top_address is returned as 0 since we don't have any information about module size
1511 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1512 dlclose(handle);
1513 return 1;
1514 }
1515 map = map->l_next;
1516 }
1517
1518 dlclose(handle);
1519 #elif defined(__APPLE__)
1520 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1521 // Value for top_address is returned as 0 since we don't have any information about module size
1522 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1523 return 1;
1524 }
1525 }
1526 return 0;
1527 #else
1528 return 1;
1529 #endif
1530 }
1531
1532 void os::get_summary_os_info(char* buf, size_t buflen) {
1533 // These buffers are small because we want this to be brief
1534 // and not use a lot of stack while generating the hs_err file.
1535 char os[100];
1536 size_t size = sizeof(os);
1537 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1538 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1539 #ifdef __APPLE__
1540 strncpy(os, "Darwin", sizeof(os));
1541 #elif __OpenBSD__
1542 strncpy(os, "OpenBSD", sizeof(os));
1543 #else
1544 strncpy(os, "BSD", sizeof(os));
1545 #endif
1546 }
1547
1548 char release[100];
1549 size = sizeof(release);
1550 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1551 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1552 // if error, leave blank
1553 strncpy(release, "", sizeof(release));
1554 }
1555 snprintf(buf, buflen, "%s %s", os, release);
1556 }
1557
1558 void os::print_os_info_brief(outputStream* st) {
1559 os::Posix::print_uname_info(st);
1560 }
1561
1562 void os::print_os_info(outputStream* st) {
1563 st->print("OS:");
1564
1565 os::Posix::print_uname_info(st);
1566
1567 os::Bsd::print_uptime_info(st);
1568
1569 os::Posix::print_rlimit_info(st);
1570
1571 os::Posix::print_load_average(st);
1572
1573 VM_Version::print_platform_virtualization_info(st);
1574 }
1575
1576 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1577 // Nothing to do for now.
1578 }
1579
1580 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1581 unsigned int mhz;
1582 size_t size = sizeof(mhz);
1583 int mib[] = { CTL_HW, HW_CPU_FREQ };
1584 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1585 mhz = 1; // looks like an error but can be divided by
1586 } else {
1587 mhz /= 1000000; // reported in millions
1588 }
1589
1590 char model[100];
1591 size = sizeof(model);
1592 int mib_model[] = { CTL_HW, HW_MODEL };
1593 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1594 strncpy(model, cpu_arch, sizeof(model));
1595 }
1596
1597 char machine[100];
1598 size = sizeof(machine);
1599 int mib_machine[] = { CTL_HW, HW_MACHINE };
1600 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1601 strncpy(machine, "", sizeof(machine));
1602 }
1603
1604 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1605 }
1606
1607 void os::print_memory_info(outputStream* st) {
1608 xsw_usage swap_usage;
1609 size_t size = sizeof(swap_usage);
1610
1611 st->print("Memory:");
1612 st->print(" %dk page", os::vm_page_size()>>10);
1613
1614 st->print(", physical " UINT64_FORMAT "k",
1615 os::physical_memory() >> 10);
1616 st->print("(" UINT64_FORMAT "k free)",
1617 os::available_memory() >> 10);
1618
1619 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1620 if (size >= offset_of(xsw_usage, xsu_used)) {
1621 st->print(", swap " UINT64_FORMAT "k",
1622 ((julong) swap_usage.xsu_total) >> 10);
1623 st->print("(" UINT64_FORMAT "k free)",
1624 ((julong) swap_usage.xsu_avail) >> 10);
1625 }
1626 }
1627
1628 st->cr();
1629 }
1630
1631 static void print_signal_handler(outputStream* st, int sig,
1632 char* buf, size_t buflen);
1633
1634 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1635 st->print_cr("Signal Handlers:");
1636 print_signal_handler(st, SIGSEGV, buf, buflen);
1637 print_signal_handler(st, SIGBUS , buf, buflen);
1638 print_signal_handler(st, SIGFPE , buf, buflen);
1639 print_signal_handler(st, SIGPIPE, buf, buflen);
1640 print_signal_handler(st, SIGXFSZ, buf, buflen);
1641 print_signal_handler(st, SIGILL , buf, buflen);
1642 print_signal_handler(st, SR_signum, buf, buflen);
1643 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1644 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1645 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1646 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1647 }
1648
1649 static char saved_jvm_path[MAXPATHLEN] = {0};
1650
1651 // Find the full path to the current module, libjvm
1652 void os::jvm_path(char *buf, jint buflen) {
1653 // Error checking.
1654 if (buflen < MAXPATHLEN) {
1655 assert(false, "must use a large-enough buffer");
1656 buf[0] = '\0';
1657 return;
1658 }
1659 // Lazy resolve the path to current module.
1660 if (saved_jvm_path[0] != 0) {
1661 strcpy(buf, saved_jvm_path);
1662 return;
1663 }
1664
1665 char dli_fname[MAXPATHLEN];
1666 bool ret = dll_address_to_library_name(
1667 CAST_FROM_FN_PTR(address, os::jvm_path),
1668 dli_fname, sizeof(dli_fname), NULL);
1669 assert(ret, "cannot locate libjvm");
1670 char *rp = NULL;
1671 if (ret && dli_fname[0] != '\0') {
1672 rp = os::Posix::realpath(dli_fname, buf, buflen);
1673 }
1674 if (rp == NULL) {
1675 return;
1676 }
1677
1678 if (Arguments::sun_java_launcher_is_altjvm()) {
1679 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1680 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1681 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1682 // appears at the right place in the string, then assume we are
1683 // installed in a JDK and we're done. Otherwise, check for a
1684 // JAVA_HOME environment variable and construct a path to the JVM
1685 // being overridden.
1686
1687 const char *p = buf + strlen(buf) - 1;
1688 for (int count = 0; p > buf && count < 5; ++count) {
1689 for (--p; p > buf && *p != '/'; --p)
1690 /* empty */ ;
1691 }
1692
1693 if (strncmp(p, "/jre/lib/", 9) != 0) {
1694 // Look for JAVA_HOME in the environment.
1695 char* java_home_var = ::getenv("JAVA_HOME");
1696 if (java_home_var != NULL && java_home_var[0] != 0) {
1697 char* jrelib_p;
1698 int len;
1699
1700 // Check the current module name "libjvm"
1701 p = strrchr(buf, '/');
1702 assert(strstr(p, "/libjvm") == p, "invalid library name");
1703
1704 rp = os::Posix::realpath(java_home_var, buf, buflen);
1705 if (rp == NULL) {
1706 return;
1707 }
1708
1709 // determine if this is a legacy image or modules image
1710 // modules image doesn't have "jre" subdirectory
1711 len = strlen(buf);
1712 assert(len < buflen, "Ran out of buffer space");
1713 jrelib_p = buf + len;
1714
1715 // Add the appropriate library subdir
1716 snprintf(jrelib_p, buflen-len, "/jre/lib");
1717 if (0 != access(buf, F_OK)) {
1718 snprintf(jrelib_p, buflen-len, "/lib");
1719 }
1720
1721 // Add the appropriate client or server subdir
1722 len = strlen(buf);
1723 jrelib_p = buf + len;
1724 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1725 if (0 != access(buf, F_OK)) {
1726 snprintf(jrelib_p, buflen-len, "%s", "");
1727 }
1728
1729 // If the path exists within JAVA_HOME, add the JVM library name
1730 // to complete the path to JVM being overridden. Otherwise fallback
1731 // to the path to the current library.
1732 if (0 == access(buf, F_OK)) {
1733 // Use current module name "libjvm"
1734 len = strlen(buf);
1735 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1736 } else {
1737 // Fall back to path of current library
1738 rp = os::Posix::realpath(dli_fname, buf, buflen);
1739 if (rp == NULL) {
1740 return;
1741 }
1742 }
1743 }
1744 }
1745 }
1746
1747 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1748 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1749 }
1750
1751 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1752 // no prefix required, not even "_"
1753 }
1754
1755 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1756 // no suffix required
1757 }
1758
1759 ////////////////////////////////////////////////////////////////////////////////
1760 // sun.misc.Signal support
1761
1762 static void UserHandler(int sig, void *siginfo, void *context) {
1763 // Ctrl-C is pressed during error reporting, likely because the error
1764 // handler fails to abort. Let VM die immediately.
1765 if (sig == SIGINT && VMError::is_error_reported()) {
1766 os::die();
1767 }
1768
1769 os::signal_notify(sig);
1770 }
1771
1772 void* os::user_handler() {
1773 return CAST_FROM_FN_PTR(void*, UserHandler);
1774 }
1775
1776 extern "C" {
1777 typedef void (*sa_handler_t)(int);
1778 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1779 }
1780
1781 void* os::signal(int signal_number, void* handler) {
1782 struct sigaction sigAct, oldSigAct;
1783
1784 sigfillset(&(sigAct.sa_mask));
1785 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1786 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1787
1788 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1789 // -1 means registration failed
1790 return (void *)-1;
1791 }
1792
1793 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1794 }
1795
1796 void os::signal_raise(int signal_number) {
1797 ::raise(signal_number);
1798 }
1799
1800 // The following code is moved from os.cpp for making this
1801 // code platform specific, which it is by its very nature.
1802
1803 // Will be modified when max signal is changed to be dynamic
1804 int os::sigexitnum_pd() {
1805 return NSIG;
1806 }
1807
1808 // a counter for each possible signal value
1809 static volatile jint pending_signals[NSIG+1] = { 0 };
1810 static Semaphore* sig_sem = NULL;
1811
1812 static void jdk_misc_signal_init() {
1813 // Initialize signal structures
1814 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1815
1816 // Initialize signal semaphore
1817 sig_sem = new Semaphore();
1818 }
1819
1820 void os::signal_notify(int sig) {
1821 if (sig_sem != NULL) {
1822 Atomic::inc(&pending_signals[sig]);
1823 sig_sem->signal();
1824 } else {
1825 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1826 // initialization isn't called.
1827 assert(ReduceSignalUsage, "signal semaphore should be created");
1828 }
1829 }
1830
1831 static int check_pending_signals() {
1832 for (;;) {
1833 for (int i = 0; i < NSIG + 1; i++) {
1834 jint n = pending_signals[i];
1835 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1836 return i;
1837 }
1838 }
1839 JavaThread *thread = JavaThread::current();
1840 ThreadBlockInVM tbivm(thread);
1841
1842 bool threadIsSuspended;
1843 do {
1844 thread->set_suspend_equivalent();
1845 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1846 sig_sem->wait();
1847
1848 // were we externally suspended while we were waiting?
1849 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1850 if (threadIsSuspended) {
1851 // The semaphore has been incremented, but while we were waiting
1852 // another thread suspended us. We don't want to continue running
1853 // while suspended because that would surprise the thread that
1854 // suspended us.
1855 sig_sem->signal();
1856
1857 thread->java_suspend_self();
1858 }
1859 } while (threadIsSuspended);
1860 }
1861 }
1862
1863 int os::signal_wait() {
1864 return check_pending_signals();
1865 }
1866
1867 ////////////////////////////////////////////////////////////////////////////////
1868 // Virtual Memory
1869
1870 int os::vm_page_size() {
1871 // Seems redundant as all get out
1872 assert(os::Bsd::page_size() != -1, "must call os::init");
1873 return os::Bsd::page_size();
1874 }
1875
1876 // Solaris allocates memory by pages.
1877 int os::vm_allocation_granularity() {
1878 assert(os::Bsd::page_size() != -1, "must call os::init");
1879 return os::Bsd::page_size();
1880 }
1881
1882 // Rationale behind this function:
1883 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1884 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1885 // samples for JITted code. Here we create private executable mapping over the code cache
1886 // and then we can use standard (well, almost, as mapping can change) way to provide
1887 // info for the reporting script by storing timestamp and location of symbol
1888 void bsd_wrap_code(char* base, size_t size) {
1889 static volatile jint cnt = 0;
1890
1891 if (!UseOprofile) {
1892 return;
1893 }
1894
1895 char buf[PATH_MAX + 1];
1896 int num = Atomic::add(&cnt, 1);
1897
1898 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1899 os::get_temp_directory(), os::current_process_id(), num);
1900 unlink(buf);
1901
1902 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1903
1904 if (fd != -1) {
1905 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1906 if (rv != (off_t)-1) {
1907 if (::write(fd, "", 1) == 1) {
1908 mmap(base, size,
1909 PROT_READ|PROT_WRITE|PROT_EXEC,
1910 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1911 }
1912 }
1913 ::close(fd);
1914 unlink(buf);
1915 }
1916 }
1917
1918 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1919 int err) {
1920 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1921 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1922 os::errno_name(err), err);
1923 }
1924
1925 // NOTE: Bsd kernel does not really reserve the pages for us.
1926 // All it does is to check if there are enough free pages
1927 // left at the time of mmap(). This could be a potential
1928 // problem.
1929 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1930 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1931 #ifdef __OpenBSD__
1932 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1933 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1934 if (::mprotect(addr, size, prot) == 0) {
1935 return true;
1936 }
1937 #else
1938 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1939 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1940 if (res != (uintptr_t) MAP_FAILED) {
1941 return true;
1942 }
1943 #endif
1944
1945 // Warn about any commit errors we see in non-product builds just
1946 // in case mmap() doesn't work as described on the man page.
1947 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1948
1949 return false;
1950 }
1951
1952 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1953 bool exec) {
1954 // alignment_hint is ignored on this OS
1955 return pd_commit_memory(addr, size, exec);
1956 }
1957
1958 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1959 const char* mesg) {
1960 assert(mesg != NULL, "mesg must be specified");
1961 if (!pd_commit_memory(addr, size, exec)) {
1962 // add extra info in product mode for vm_exit_out_of_memory():
1963 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1964 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1965 }
1966 }
1967
1968 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1969 size_t alignment_hint, bool exec,
1970 const char* mesg) {
1971 // alignment_hint is ignored on this OS
1972 pd_commit_memory_or_exit(addr, size, exec, mesg);
1973 }
1974
1975 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1976 }
1977
1978 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
1979 ::madvise(addr, bytes, MADV_DONTNEED);
1980 }
1981
1982 void os::numa_make_global(char *addr, size_t bytes) {
1983 }
1984
1985 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
1986 }
1987
1988 bool os::numa_topology_changed() { return false; }
1989
1990 size_t os::numa_get_groups_num() {
1991 return 1;
1992 }
1993
1994 int os::numa_get_group_id() {
1995 return 0;
1996 }
1997
1998 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
1999 if (size > 0) {
2000 ids[0] = 0;
2001 return 1;
2002 }
2003 return 0;
2004 }
2005
2006 int os::numa_get_group_id_for_address(const void* address) {
2007 return 0;
2008 }
2009
2010 bool os::get_page_info(char *start, page_info* info) {
2011 return false;
2012 }
2013
2014 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2015 return end;
2016 }
2017
2018
2019 bool os::pd_uncommit_memory(char* addr, size_t size) {
2020 #ifdef __OpenBSD__
2021 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2022 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2023 return ::mprotect(addr, size, PROT_NONE) == 0;
2024 #else
2025 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2026 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2027 return res != (uintptr_t) MAP_FAILED;
2028 #endif
2029 }
2030
2031 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2032 return os::commit_memory(addr, size, !ExecMem);
2033 }
2034
2035 // If this is a growable mapping, remove the guard pages entirely by
2036 // munmap()ping them. If not, just call uncommit_memory().
2037 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2038 return os::uncommit_memory(addr, size);
2039 }
2040
2041 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2042 // at 'requested_addr'. If there are existing memory mappings at the same
2043 // location, however, they will be overwritten. If 'fixed' is false,
2044 // 'requested_addr' is only treated as a hint, the return value may or
2045 // may not start from the requested address. Unlike Bsd mmap(), this
2046 // function returns NULL to indicate failure.
2047 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2048 char * addr;
2049 int flags;
2050
2051 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2052 if (fixed) {
2053 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2054 flags |= MAP_FIXED;
2055 }
2056
2057 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2058 // touch an uncommitted page. Otherwise, the read/write might
2059 // succeed if we have enough swap space to back the physical page.
2060 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2061 flags, -1, 0);
2062
2063 return addr == MAP_FAILED ? NULL : addr;
2064 }
2065
2066 static int anon_munmap(char * addr, size_t size) {
2067 return ::munmap(addr, size) == 0;
2068 }
2069
2070 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2071 size_t alignment_hint) {
2072 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2073 }
2074
2075 bool os::pd_release_memory(char* addr, size_t size) {
2076 return anon_munmap(addr, size);
2077 }
2078
2079 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2080 // Bsd wants the mprotect address argument to be page aligned.
2081 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2082
2083 // According to SUSv3, mprotect() should only be used with mappings
2084 // established by mmap(), and mmap() always maps whole pages. Unaligned
2085 // 'addr' likely indicates problem in the VM (e.g. trying to change
2086 // protection of malloc'ed or statically allocated memory). Check the
2087 // caller if you hit this assert.
2088 assert(addr == bottom, "sanity check");
2089
2090 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2091 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2092 return ::mprotect(bottom, size, prot) == 0;
2093 }
2094
2095 // Set protections specified
2096 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2097 bool is_committed) {
2098 unsigned int p = 0;
2099 switch (prot) {
2100 case MEM_PROT_NONE: p = PROT_NONE; break;
2101 case MEM_PROT_READ: p = PROT_READ; break;
2102 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2103 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2104 default:
2105 ShouldNotReachHere();
2106 }
2107 // is_committed is unused.
2108 return bsd_mprotect(addr, bytes, p);
2109 }
2110
2111 bool os::guard_memory(char* addr, size_t size) {
2112 return bsd_mprotect(addr, size, PROT_NONE);
2113 }
2114
2115 bool os::unguard_memory(char* addr, size_t size) {
2116 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2117 }
2118
2119 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2120 return false;
2121 }
2122
2123 // Large page support
2124
2125 static size_t _large_page_size = 0;
2126
2127 void os::large_page_init() {
2128 }
2129
2130
2131 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2132 fatal("os::reserve_memory_special should not be called on BSD.");
2133 return NULL;
2134 }
2135
2136 bool os::pd_release_memory_special(char* base, size_t bytes) {
2137 fatal("os::release_memory_special should not be called on BSD.");
2138 return false;
2139 }
2140
2141 size_t os::large_page_size() {
2142 return _large_page_size;
2143 }
2144
2145 bool os::can_commit_large_page_memory() {
2146 // Does not matter, we do not support huge pages.
2147 return false;
2148 }
2149
2150 bool os::can_execute_large_page_memory() {
2151 // Does not matter, we do not support huge pages.
2152 return false;
2153 }
2154
2155 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2156 assert(file_desc >= 0, "file_desc is not valid");
2157 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2158 if (result != NULL) {
2159 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2160 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2161 }
2162 }
2163 return result;
2164 }
2165
2166 // Reserve memory at an arbitrary address, only if that area is
2167 // available (and not reserved for something else).
2168
2169 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2170 // Assert only that the size is a multiple of the page size, since
2171 // that's all that mmap requires, and since that's all we really know
2172 // about at this low abstraction level. If we need higher alignment,
2173 // we can either pass an alignment to this method or verify alignment
2174 // in one of the methods further up the call chain. See bug 5044738.
2175 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2176
2177 // Repeatedly allocate blocks until the block is allocated at the
2178 // right spot.
2179
2180 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2181 // if kernel honors the hint then we can return immediately.
2182 char * addr = anon_mmap(requested_addr, bytes, false);
2183 if (addr == requested_addr) {
2184 return requested_addr;
2185 }
2186
2187 if (addr != NULL) {
2188 // mmap() is successful but it fails to reserve at the requested address
2189 anon_munmap(addr, bytes);
2190 }
2191
2192 return NULL;
2193 }
2194
2195 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2196 void os::infinite_sleep() {
2197 while (true) { // sleep forever ...
2198 ::sleep(100); // ... 100 seconds at a time
2199 }
2200 }
2201
2202 // Used to convert frequent JVM_Yield() to nops
2203 bool os::dont_yield() {
2204 return DontYieldALot;
2205 }
2206
2207 void os::naked_yield() {
2208 sched_yield();
2209 }
2210
2211 ////////////////////////////////////////////////////////////////////////////////
2212 // thread priority support
2213
2214 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2215 // only supports dynamic priority, static priority must be zero. For real-time
2216 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2217 // However, for large multi-threaded applications, SCHED_RR is not only slower
2218 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2219 // of 5 runs - Sep 2005).
2220 //
2221 // The following code actually changes the niceness of kernel-thread/LWP. It
2222 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2223 // not the entire user process, and user level threads are 1:1 mapped to kernel
2224 // threads. It has always been the case, but could change in the future. For
2225 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2226 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2227 // (e.g., root privilege or CAP_SYS_NICE capability).
2228
2229 #if !defined(__APPLE__)
2230 int os::java_to_os_priority[CriticalPriority + 1] = {
2231 19, // 0 Entry should never be used
2232
2233 0, // 1 MinPriority
2234 3, // 2
2235 6, // 3
2236
2237 10, // 4
2238 15, // 5 NormPriority
2239 18, // 6
2240
2241 21, // 7
2242 25, // 8
2243 28, // 9 NearMaxPriority
2244
2245 31, // 10 MaxPriority
2246
2247 31 // 11 CriticalPriority
2248 };
2249 #else
2250 // Using Mach high-level priority assignments
2251 int os::java_to_os_priority[CriticalPriority + 1] = {
2252 0, // 0 Entry should never be used (MINPRI_USER)
2253
2254 27, // 1 MinPriority
2255 28, // 2
2256 29, // 3
2257
2258 30, // 4
2259 31, // 5 NormPriority (BASEPRI_DEFAULT)
2260 32, // 6
2261
2262 33, // 7
2263 34, // 8
2264 35, // 9 NearMaxPriority
2265
2266 36, // 10 MaxPriority
2267
2268 36 // 11 CriticalPriority
2269 };
2270 #endif
2271
2272 static int prio_init() {
2273 if (ThreadPriorityPolicy == 1) {
2274 if (geteuid() != 0) {
2275 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) {
2276 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2277 "e.g., being the root user. If the necessary permission is not " \
2278 "possessed, changes to priority will be silently ignored.");
2279 }
2280 }
2281 }
2282 if (UseCriticalJavaThreadPriority) {
2283 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2284 }
2285 return 0;
2286 }
2287
2288 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2289 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2290
2291 #ifdef __OpenBSD__
2292 // OpenBSD pthread_setprio starves low priority threads
2293 return OS_OK;
2294 #elif defined(__FreeBSD__)
2295 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2296 return (ret == 0) ? OS_OK : OS_ERR;
2297 #elif defined(__APPLE__) || defined(__NetBSD__)
2298 struct sched_param sp;
2299 int policy;
2300
2301 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2302 return OS_ERR;
2303 }
2304
2305 sp.sched_priority = newpri;
2306 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2307 return OS_ERR;
2308 }
2309
2310 return OS_OK;
2311 #else
2312 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2313 return (ret == 0) ? OS_OK : OS_ERR;
2314 #endif
2315 }
2316
2317 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2318 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2319 *priority_ptr = java_to_os_priority[NormPriority];
2320 return OS_OK;
2321 }
2322
2323 errno = 0;
2324 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2325 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2326 #elif defined(__APPLE__) || defined(__NetBSD__)
2327 int policy;
2328 struct sched_param sp;
2329
2330 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2331 if (res != 0) {
2332 *priority_ptr = -1;
2333 return OS_ERR;
2334 } else {
2335 *priority_ptr = sp.sched_priority;
2336 return OS_OK;
2337 }
2338 #else
2339 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2340 #endif
2341 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2342 }
2343
2344 ////////////////////////////////////////////////////////////////////////////////
2345 // suspend/resume support
2346
2347 // The low-level signal-based suspend/resume support is a remnant from the
2348 // old VM-suspension that used to be for java-suspension, safepoints etc,
2349 // within hotspot. Currently used by JFR's OSThreadSampler
2350 //
2351 // The remaining code is greatly simplified from the more general suspension
2352 // code that used to be used.
2353 //
2354 // The protocol is quite simple:
2355 // - suspend:
2356 // - sends a signal to the target thread
2357 // - polls the suspend state of the osthread using a yield loop
2358 // - target thread signal handler (SR_handler) sets suspend state
2359 // and blocks in sigsuspend until continued
2360 // - resume:
2361 // - sets target osthread state to continue
2362 // - sends signal to end the sigsuspend loop in the SR_handler
2363 //
2364 // Note that the SR_lock plays no role in this suspend/resume protocol,
2365 // but is checked for NULL in SR_handler as a thread termination indicator.
2366 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2367 //
2368 // Note that resume_clear_context() and suspend_save_context() are needed
2369 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2370 // which in part is used by:
2371 // - Forte Analyzer: AsyncGetCallTrace()
2372 // - StackBanging: get_frame_at_stack_banging_point()
2373
2374 static void resume_clear_context(OSThread *osthread) {
2375 osthread->set_ucontext(NULL);
2376 osthread->set_siginfo(NULL);
2377 }
2378
2379 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2380 osthread->set_ucontext(context);
2381 osthread->set_siginfo(siginfo);
2382 }
2383
2384 // Handler function invoked when a thread's execution is suspended or
2385 // resumed. We have to be careful that only async-safe functions are
2386 // called here (Note: most pthread functions are not async safe and
2387 // should be avoided.)
2388 //
2389 // Note: sigwait() is a more natural fit than sigsuspend() from an
2390 // interface point of view, but sigwait() prevents the signal hander
2391 // from being run. libpthread would get very confused by not having
2392 // its signal handlers run and prevents sigwait()'s use with the
2393 // mutex granting granting signal.
2394 //
2395 // Currently only ever called on the VMThread or JavaThread
2396 //
2397 #ifdef __APPLE__
2398 static OSXSemaphore sr_semaphore;
2399 #else
2400 static PosixSemaphore sr_semaphore;
2401 #endif
2402
2403 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2404 // Save and restore errno to avoid confusing native code with EINTR
2405 // after sigsuspend.
2406 int old_errno = errno;
2407
2408 Thread* thread = Thread::current_or_null_safe();
2409 assert(thread != NULL, "Missing current thread in SR_handler");
2410
2411 // On some systems we have seen signal delivery get "stuck" until the signal
2412 // mask is changed as part of thread termination. Check that the current thread
2413 // has not already terminated (via SR_lock()) - else the following assertion
2414 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2415 // destructor has completed.
2416
2417 if (thread->SR_lock() == NULL) {
2418 return;
2419 }
2420
2421 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2422
2423 OSThread* osthread = thread->osthread();
2424
2425 os::SuspendResume::State current = osthread->sr.state();
2426 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2427 suspend_save_context(osthread, siginfo, context);
2428
2429 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2430 os::SuspendResume::State state = osthread->sr.suspended();
2431 if (state == os::SuspendResume::SR_SUSPENDED) {
2432 sigset_t suspend_set; // signals for sigsuspend()
2433
2434 // get current set of blocked signals and unblock resume signal
2435 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2436 sigdelset(&suspend_set, SR_signum);
2437
2438 sr_semaphore.signal();
2439 // wait here until we are resumed
2440 while (1) {
2441 sigsuspend(&suspend_set);
2442
2443 os::SuspendResume::State result = osthread->sr.running();
2444 if (result == os::SuspendResume::SR_RUNNING) {
2445 sr_semaphore.signal();
2446 break;
2447 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2448 ShouldNotReachHere();
2449 }
2450 }
2451
2452 } else if (state == os::SuspendResume::SR_RUNNING) {
2453 // request was cancelled, continue
2454 } else {
2455 ShouldNotReachHere();
2456 }
2457
2458 resume_clear_context(osthread);
2459 } else if (current == os::SuspendResume::SR_RUNNING) {
2460 // request was cancelled, continue
2461 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2462 // ignore
2463 } else {
2464 // ignore
2465 }
2466
2467 errno = old_errno;
2468 }
2469
2470
2471 static int SR_initialize() {
2472 struct sigaction act;
2473 char *s;
2474 // Get signal number to use for suspend/resume
2475 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2476 int sig = ::strtol(s, 0, 10);
2477 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2478 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2479 SR_signum = sig;
2480 } else {
2481 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2482 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2483 }
2484 }
2485
2486 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2487 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2488
2489 sigemptyset(&SR_sigset);
2490 sigaddset(&SR_sigset, SR_signum);
2491
2492 // Set up signal handler for suspend/resume
2493 act.sa_flags = SA_RESTART|SA_SIGINFO;
2494 act.sa_handler = (void (*)(int)) SR_handler;
2495
2496 // SR_signum is blocked by default.
2497 // 4528190 - We also need to block pthread restart signal (32 on all
2498 // supported Bsd platforms). Note that BsdThreads need to block
2499 // this signal for all threads to work properly. So we don't have
2500 // to use hard-coded signal number when setting up the mask.
2501 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2502
2503 if (sigaction(SR_signum, &act, 0) == -1) {
2504 return -1;
2505 }
2506
2507 // Save signal flag
2508 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2509 return 0;
2510 }
2511
2512 static int sr_notify(OSThread* osthread) {
2513 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2514 assert_status(status == 0, status, "pthread_kill");
2515 return status;
2516 }
2517
2518 // "Randomly" selected value for how long we want to spin
2519 // before bailing out on suspending a thread, also how often
2520 // we send a signal to a thread we want to resume
2521 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2522 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2523
2524 // returns true on success and false on error - really an error is fatal
2525 // but this seems the normal response to library errors
2526 static bool do_suspend(OSThread* osthread) {
2527 assert(osthread->sr.is_running(), "thread should be running");
2528 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2529
2530 // mark as suspended and send signal
2531 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2532 // failed to switch, state wasn't running?
2533 ShouldNotReachHere();
2534 return false;
2535 }
2536
2537 if (sr_notify(osthread) != 0) {
2538 ShouldNotReachHere();
2539 }
2540
2541 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2542 while (true) {
2543 if (sr_semaphore.timedwait(2)) {
2544 break;
2545 } else {
2546 // timeout
2547 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2548 if (cancelled == os::SuspendResume::SR_RUNNING) {
2549 return false;
2550 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2551 // make sure that we consume the signal on the semaphore as well
2552 sr_semaphore.wait();
2553 break;
2554 } else {
2555 ShouldNotReachHere();
2556 return false;
2557 }
2558 }
2559 }
2560
2561 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2562 return true;
2563 }
2564
2565 static void do_resume(OSThread* osthread) {
2566 assert(osthread->sr.is_suspended(), "thread should be suspended");
2567 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2568
2569 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2570 // failed to switch to WAKEUP_REQUEST
2571 ShouldNotReachHere();
2572 return;
2573 }
2574
2575 while (true) {
2576 if (sr_notify(osthread) == 0) {
2577 if (sr_semaphore.timedwait(2)) {
2578 if (osthread->sr.is_running()) {
2579 return;
2580 }
2581 }
2582 } else {
2583 ShouldNotReachHere();
2584 }
2585 }
2586
2587 guarantee(osthread->sr.is_running(), "Must be running!");
2588 }
2589
2590 ///////////////////////////////////////////////////////////////////////////////////
2591 // signal handling (except suspend/resume)
2592
2593 // This routine may be used by user applications as a "hook" to catch signals.
2594 // The user-defined signal handler must pass unrecognized signals to this
2595 // routine, and if it returns true (non-zero), then the signal handler must
2596 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2597 // routine will never retun false (zero), but instead will execute a VM panic
2598 // routine kill the process.
2599 //
2600 // If this routine returns false, it is OK to call it again. This allows
2601 // the user-defined signal handler to perform checks either before or after
2602 // the VM performs its own checks. Naturally, the user code would be making
2603 // a serious error if it tried to handle an exception (such as a null check
2604 // or breakpoint) that the VM was generating for its own correct operation.
2605 //
2606 // This routine may recognize any of the following kinds of signals:
2607 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2608 // It should be consulted by handlers for any of those signals.
2609 //
2610 // The caller of this routine must pass in the three arguments supplied
2611 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2612 // field of the structure passed to sigaction(). This routine assumes that
2613 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2614 //
2615 // Note that the VM will print warnings if it detects conflicting signal
2616 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2617 //
2618 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2619 void* ucontext,
2620 int abort_if_unrecognized);
2621
2622 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2623 assert(info != NULL && uc != NULL, "it must be old kernel");
2624 int orig_errno = errno; // Preserve errno value over signal handler.
2625 JVM_handle_bsd_signal(sig, info, uc, true);
2626 errno = orig_errno;
2627 }
2628
2629
2630 // This boolean allows users to forward their own non-matching signals
2631 // to JVM_handle_bsd_signal, harmlessly.
2632 bool os::Bsd::signal_handlers_are_installed = false;
2633
2634 // For signal-chaining
2635 bool os::Bsd::libjsig_is_loaded = false;
2636 typedef struct sigaction *(*get_signal_t)(int);
2637 get_signal_t os::Bsd::get_signal_action = NULL;
2638
2639 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2640 struct sigaction *actp = NULL;
2641
2642 if (libjsig_is_loaded) {
2643 // Retrieve the old signal handler from libjsig
2644 actp = (*get_signal_action)(sig);
2645 }
2646 if (actp == NULL) {
2647 // Retrieve the preinstalled signal handler from jvm
2648 actp = os::Posix::get_preinstalled_handler(sig);
2649 }
2650
2651 return actp;
2652 }
2653
2654 static bool call_chained_handler(struct sigaction *actp, int sig,
2655 siginfo_t *siginfo, void *context) {
2656 // Call the old signal handler
2657 if (actp->sa_handler == SIG_DFL) {
2658 // It's more reasonable to let jvm treat it as an unexpected exception
2659 // instead of taking the default action.
2660 return false;
2661 } else if (actp->sa_handler != SIG_IGN) {
2662 if ((actp->sa_flags & SA_NODEFER) == 0) {
2663 // automaticlly block the signal
2664 sigaddset(&(actp->sa_mask), sig);
2665 }
2666
2667 sa_handler_t hand;
2668 sa_sigaction_t sa;
2669 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2670 // retrieve the chained handler
2671 if (siginfo_flag_set) {
2672 sa = actp->sa_sigaction;
2673 } else {
2674 hand = actp->sa_handler;
2675 }
2676
2677 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2678 actp->sa_handler = SIG_DFL;
2679 }
2680
2681 // try to honor the signal mask
2682 sigset_t oset;
2683 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2684
2685 // call into the chained handler
2686 if (siginfo_flag_set) {
2687 (*sa)(sig, siginfo, context);
2688 } else {
2689 (*hand)(sig);
2690 }
2691
2692 // restore the signal mask
2693 pthread_sigmask(SIG_SETMASK, &oset, 0);
2694 }
2695 // Tell jvm's signal handler the signal is taken care of.
2696 return true;
2697 }
2698
2699 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2700 bool chained = false;
2701 // signal-chaining
2702 if (UseSignalChaining) {
2703 struct sigaction *actp = get_chained_signal_action(sig);
2704 if (actp != NULL) {
2705 chained = call_chained_handler(actp, sig, siginfo, context);
2706 }
2707 }
2708 return chained;
2709 }
2710
2711 // for diagnostic
2712 int sigflags[NSIG];
2713
2714 int os::Bsd::get_our_sigflags(int sig) {
2715 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2716 return sigflags[sig];
2717 }
2718
2719 void os::Bsd::set_our_sigflags(int sig, int flags) {
2720 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2721 if (sig > 0 && sig < NSIG) {
2722 sigflags[sig] = flags;
2723 }
2724 }
2725
2726 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2727 // Check for overwrite.
2728 struct sigaction oldAct;
2729 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2730
2731 void* oldhand = oldAct.sa_sigaction
2732 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2733 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2734 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2735 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2736 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2737 if (AllowUserSignalHandlers || !set_installed) {
2738 // Do not overwrite; user takes responsibility to forward to us.
2739 return;
2740 } else if (UseSignalChaining) {
2741 // save the old handler in jvm
2742 os::Posix::save_preinstalled_handler(sig, oldAct);
2743 // libjsig also interposes the sigaction() call below and saves the
2744 // old sigaction on it own.
2745 } else {
2746 fatal("Encountered unexpected pre-existing sigaction handler "
2747 "%#lx for signal %d.", (long)oldhand, sig);
2748 }
2749 }
2750
2751 struct sigaction sigAct;
2752 sigfillset(&(sigAct.sa_mask));
2753 sigAct.sa_handler = SIG_DFL;
2754 if (!set_installed) {
2755 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2756 } else {
2757 sigAct.sa_sigaction = signalHandler;
2758 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2759 }
2760 #ifdef __APPLE__
2761 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2762 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2763 // if the signal handler declares it will handle it on alternate stack.
2764 // Notice we only declare we will handle it on alt stack, but we are not
2765 // actually going to use real alt stack - this is just a workaround.
2766 // Please see ux_exception.c, method catch_mach_exception_raise for details
2767 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2768 if (sig == SIGSEGV) {
2769 sigAct.sa_flags |= SA_ONSTACK;
2770 }
2771 #endif
2772
2773 // Save flags, which are set by ours
2774 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2775 sigflags[sig] = sigAct.sa_flags;
2776
2777 int ret = sigaction(sig, &sigAct, &oldAct);
2778 assert(ret == 0, "check");
2779
2780 void* oldhand2 = oldAct.sa_sigaction
2781 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2782 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2783 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2784 }
2785
2786 // install signal handlers for signals that HotSpot needs to
2787 // handle in order to support Java-level exception handling.
2788
2789 void os::Bsd::install_signal_handlers() {
2790 if (!signal_handlers_are_installed) {
2791 signal_handlers_are_installed = true;
2792
2793 // signal-chaining
2794 typedef void (*signal_setting_t)();
2795 signal_setting_t begin_signal_setting = NULL;
2796 signal_setting_t end_signal_setting = NULL;
2797 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2798 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2799 if (begin_signal_setting != NULL) {
2800 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2801 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2802 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2803 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2804 libjsig_is_loaded = true;
2805 assert(UseSignalChaining, "should enable signal-chaining");
2806 }
2807 if (libjsig_is_loaded) {
2808 // Tell libjsig jvm is setting signal handlers
2809 (*begin_signal_setting)();
2810 }
2811
2812 set_signal_handler(SIGSEGV, true);
2813 set_signal_handler(SIGPIPE, true);
2814 set_signal_handler(SIGBUS, true);
2815 set_signal_handler(SIGILL, true);
2816 set_signal_handler(SIGFPE, true);
2817 set_signal_handler(SIGXFSZ, true);
2818
2819 #if defined(__APPLE__)
2820 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2821 // signals caught and handled by the JVM. To work around this, we reset the mach task
2822 // signal handler that's placed on our process by CrashReporter. This disables
2823 // CrashReporter-based reporting.
2824 //
2825 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2826 // on caught fatal signals.
2827 //
2828 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2829 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2830 // exception handling, while leaving the standard BSD signal handlers functional.
2831 kern_return_t kr;
2832 kr = task_set_exception_ports(mach_task_self(),
2833 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2834 MACH_PORT_NULL,
2835 EXCEPTION_STATE_IDENTITY,
2836 MACHINE_THREAD_STATE);
2837
2838 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2839 #endif
2840
2841 if (libjsig_is_loaded) {
2842 // Tell libjsig jvm finishes setting signal handlers
2843 (*end_signal_setting)();
2844 }
2845
2846 // We don't activate signal checker if libjsig is in place, we trust ourselves
2847 // and if UserSignalHandler is installed all bets are off
2848 if (CheckJNICalls) {
2849 if (libjsig_is_loaded) {
2850 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
2851 check_signals = false;
2852 }
2853 if (AllowUserSignalHandlers) {
2854 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2855 check_signals = false;
2856 }
2857 }
2858 }
2859 }
2860
2861
2862 /////
2863 // glibc on Bsd platform uses non-documented flag
2864 // to indicate, that some special sort of signal
2865 // trampoline is used.
2866 // We will never set this flag, and we should
2867 // ignore this flag in our diagnostic
2868 #ifdef SIGNIFICANT_SIGNAL_MASK
2869 #undef SIGNIFICANT_SIGNAL_MASK
2870 #endif
2871 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2872
2873 static const char* get_signal_handler_name(address handler,
2874 char* buf, int buflen) {
2875 int offset;
2876 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2877 if (found) {
2878 // skip directory names
2879 const char *p1, *p2;
2880 p1 = buf;
2881 size_t len = strlen(os::file_separator());
2882 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2883 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2884 } else {
2885 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2886 }
2887 return buf;
2888 }
2889
2890 static void print_signal_handler(outputStream* st, int sig,
2891 char* buf, size_t buflen) {
2892 struct sigaction sa;
2893
2894 sigaction(sig, NULL, &sa);
2895
2896 // See comment for SIGNIFICANT_SIGNAL_MASK define
2897 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2898
2899 st->print("%s: ", os::exception_name(sig, buf, buflen));
2900
2901 address handler = (sa.sa_flags & SA_SIGINFO)
2902 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2903 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2904
2905 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2906 st->print("SIG_DFL");
2907 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2908 st->print("SIG_IGN");
2909 } else {
2910 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2911 }
2912
2913 st->print(", sa_mask[0]=");
2914 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2915
2916 address rh = VMError::get_resetted_sighandler(sig);
2917 // May be, handler was resetted by VMError?
2918 if (rh != NULL) {
2919 handler = rh;
2920 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2921 }
2922
2923 st->print(", sa_flags=");
2924 os::Posix::print_sa_flags(st, sa.sa_flags);
2925
2926 // Check: is it our handler?
2927 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2928 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2929 // It is our signal handler
2930 // check for flags, reset system-used one!
2931 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2932 st->print(
2933 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2934 os::Bsd::get_our_sigflags(sig));
2935 }
2936 }
2937 st->cr();
2938 }
2939
2940
2941 #define DO_SIGNAL_CHECK(sig) \
2942 do { \
2943 if (!sigismember(&check_signal_done, sig)) { \
2944 os::Bsd::check_signal_handler(sig); \
2945 } \
2946 } while (0)
2947
2948 // This method is a periodic task to check for misbehaving JNI applications
2949 // under CheckJNI, we can add any periodic checks here
2950
2951 void os::run_periodic_checks() {
2952
2953 if (check_signals == false) return;
2954
2955 // SEGV and BUS if overridden could potentially prevent
2956 // generation of hs*.log in the event of a crash, debugging
2957 // such a case can be very challenging, so we absolutely
2958 // check the following for a good measure:
2959 DO_SIGNAL_CHECK(SIGSEGV);
2960 DO_SIGNAL_CHECK(SIGILL);
2961 DO_SIGNAL_CHECK(SIGFPE);
2962 DO_SIGNAL_CHECK(SIGBUS);
2963 DO_SIGNAL_CHECK(SIGPIPE);
2964 DO_SIGNAL_CHECK(SIGXFSZ);
2965
2966
2967 // ReduceSignalUsage allows the user to override these handlers
2968 // see comments at the very top and jvm_md.h
2969 if (!ReduceSignalUsage) {
2970 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
2971 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
2972 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
2973 DO_SIGNAL_CHECK(BREAK_SIGNAL);
2974 }
2975
2976 DO_SIGNAL_CHECK(SR_signum);
2977 }
2978
2979 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
2980
2981 static os_sigaction_t os_sigaction = NULL;
2982
2983 void os::Bsd::check_signal_handler(int sig) {
2984 char buf[O_BUFLEN];
2985 address jvmHandler = NULL;
2986
2987
2988 struct sigaction act;
2989 if (os_sigaction == NULL) {
2990 // only trust the default sigaction, in case it has been interposed
2991 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
2992 if (os_sigaction == NULL) return;
2993 }
2994
2995 os_sigaction(sig, (struct sigaction*)NULL, &act);
2996
2997
2998 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2999
3000 address thisHandler = (act.sa_flags & SA_SIGINFO)
3001 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3002 : CAST_FROM_FN_PTR(address, act.sa_handler);
3003
3004
3005 switch (sig) {
3006 case SIGSEGV:
3007 case SIGBUS:
3008 case SIGFPE:
3009 case SIGPIPE:
3010 case SIGILL:
3011 case SIGXFSZ:
3012 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3013 break;
3014
3015 case SHUTDOWN1_SIGNAL:
3016 case SHUTDOWN2_SIGNAL:
3017 case SHUTDOWN3_SIGNAL:
3018 case BREAK_SIGNAL:
3019 jvmHandler = (address)user_handler();
3020 break;
3021
3022 default:
3023 if (sig == SR_signum) {
3024 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3025 } else {
3026 return;
3027 }
3028 break;
3029 }
3030
3031 if (thisHandler != jvmHandler) {
3032 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3033 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3034 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3035 // No need to check this sig any longer
3036 sigaddset(&check_signal_done, sig);
3037 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3038 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3039 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3040 exception_name(sig, buf, O_BUFLEN));
3041 }
3042 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3043 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3044 tty->print("expected:");
3045 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3046 tty->cr();
3047 tty->print(" found:");
3048 os::Posix::print_sa_flags(tty, act.sa_flags);
3049 tty->cr();
3050 // No need to check this sig any longer
3051 sigaddset(&check_signal_done, sig);
3052 }
3053
3054 // Dump all the signal
3055 if (sigismember(&check_signal_done, sig)) {
3056 print_signal_handlers(tty, buf, O_BUFLEN);
3057 }
3058 }
3059
3060 extern void report_error(char* file_name, int line_no, char* title,
3061 char* format, ...);
3062
3063 // this is called _before_ the most of global arguments have been parsed
3064 void os::init(void) {
3065 char dummy; // used to get a guess on initial stack address
3066
3067 clock_tics_per_sec = CLK_TCK;
3068
3069 init_random(1234567);
3070
3071 Bsd::set_page_size(getpagesize());
3072 if (Bsd::page_size() == -1) {
3073 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3074 }
3075 init_page_sizes((size_t) Bsd::page_size());
3076
3077 Bsd::initialize_system_info();
3078
3079 // _main_thread points to the thread that created/loaded the JVM.
3080 Bsd::_main_thread = pthread_self();
3081
3082 Bsd::clock_init();
3083 initial_time_count = javaTimeNanos();
3084
3085 os::Posix::init();
3086 }
3087
3088 // To install functions for atexit system call
3089 extern "C" {
3090 static void perfMemory_exit_helper() {
3091 perfMemory_exit();
3092 }
3093 }
3094
3095 // this is called _after_ the global arguments have been parsed
3096 jint os::init_2(void) {
3097
3098 // This could be set after os::Posix::init() but all platforms
3099 // have to set it the same so we have to mirror Solaris.
3100 DEBUG_ONLY(os::set_mutex_init_done();)
3101
3102 os::Posix::init_2();
3103
3104 // initialize suspend/resume support - must do this before signal_sets_init()
3105 if (SR_initialize() != 0) {
3106 perror("SR_initialize failed");
3107 return JNI_ERR;
3108 }
3109
3110 Bsd::signal_sets_init();
3111 Bsd::install_signal_handlers();
3112 // Initialize data for jdk.internal.misc.Signal
3113 if (!ReduceSignalUsage) {
3114 jdk_misc_signal_init();
3115 }
3116
3117 // Check and sets minimum stack sizes against command line options
3118 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3119 return JNI_ERR;
3120 }
3121
3122 // Not supported.
3123 FLAG_SET_ERGO(UseNUMA, false);
3124 FLAG_SET_ERGO(UseNUMAInterleaving, false);
3125
3126 if (MaxFDLimit) {
3127 // set the number of file descriptors to max. print out error
3128 // if getrlimit/setrlimit fails but continue regardless.
3129 struct rlimit nbr_files;
3130 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3131 if (status != 0) {
3132 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3133 } else {
3134 nbr_files.rlim_cur = nbr_files.rlim_max;
3135
3136 #ifdef __APPLE__
3137 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3138 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3139 // be used instead
3140 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3141 #endif
3142
3143 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3144 if (status != 0) {
3145 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3146 }
3147 }
3148 }
3149
3150 // at-exit methods are called in the reverse order of their registration.
3151 // atexit functions are called on return from main or as a result of a
3152 // call to exit(3C). There can be only 32 of these functions registered
3153 // and atexit() does not set errno.
3154
3155 if (PerfAllowAtExitRegistration) {
3156 // only register atexit functions if PerfAllowAtExitRegistration is set.
3157 // atexit functions can be delayed until process exit time, which
3158 // can be problematic for embedded VM situations. Embedded VMs should
3159 // call DestroyJavaVM() to assure that VM resources are released.
3160
3161 // note: perfMemory_exit_helper atexit function may be removed in
3162 // the future if the appropriate cleanup code can be added to the
3163 // VM_Exit VMOperation's doit method.
3164 if (atexit(perfMemory_exit_helper) != 0) {
3165 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3166 }
3167 }
3168
3169 // initialize thread priority policy
3170 prio_init();
3171
3172 #ifdef __APPLE__
3173 // dynamically link to objective c gc registration
3174 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3175 if (handleLibObjc != NULL) {
3176 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3177 }
3178 #endif
3179
3180 return JNI_OK;
3181 }
3182
3183 int os::active_processor_count() {
3184 // User has overridden the number of active processors
3185 if (ActiveProcessorCount > 0) {
3186 log_trace(os)("active_processor_count: "
3187 "active processor count set by user : %d",
3188 ActiveProcessorCount);
3189 return ActiveProcessorCount;
3190 }
3191
3192 return _processor_count;
3193 }
3194
3195 #ifdef __APPLE__
3196 uint os::processor_id() {
3197 // Get the initial APIC id and return the associated processor id. The initial APIC
3198 // id is limited to 8-bits, which means we can have at most 256 unique APIC ids. If
3199 // the system has more processors (or the initial APIC ids are discontiguous) the
3200 // APIC id will be truncated and more than one processor will potentially share the
3201 // same processor id. This is not optimal, but unlikely to happen in practice. Should
3202 // this become a real problem we could switch to using x2APIC ids, which are 32-bit
3203 // wide. However, note that x2APIC is Intel-specific, and the wider number space
3204 // would require a more complicated mapping approach.
3205 uint eax = 0x1;
3206 uint ebx;
3207 uint ecx = 0;
3208 uint edx;
3209
3210 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3211
3212 uint apic_id = (ebx >> 24) & (processor_id_map_size - 1);
3213 int processor_id = Atomic::load(&processor_id_map[apic_id]);
3214
3215 while (processor_id < 0) {
3216 // Assign processor id to APIC id
3217 processor_id = Atomic::cmpxchg(&processor_id_map[apic_id], processor_id_unassigned, processor_id_assigning);
3218 if (processor_id == processor_id_unassigned) {
3219 processor_id = Atomic::fetch_and_add(&processor_id_next, 1) % os::processor_count();
3220 Atomic::store(&processor_id_map[apic_id], processor_id);
3221 }
3222 }
3223
3224 assert(processor_id >= 0 && processor_id < os::processor_count(), "invalid processor id");
3225
3226 return (uint)processor_id;
3227 }
3228 #endif
3229
3230 void os::set_native_thread_name(const char *name) {
3231 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3232 // This is only supported in Snow Leopard and beyond
3233 if (name != NULL) {
3234 // Add a "Java: " prefix to the name
3235 char buf[MAXTHREADNAMESIZE];
3236 snprintf(buf, sizeof(buf), "Java: %s", name);
3237 pthread_setname_np(buf);
3238 }
3239 #endif
3240 }
3241
3242 bool os::bind_to_processor(uint processor_id) {
3243 // Not yet implemented.
3244 return false;
3245 }
3246
3247 void os::SuspendedThreadTask::internal_do_task() {
3248 if (do_suspend(_thread->osthread())) {
3249 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3250 do_task(context);
3251 do_resume(_thread->osthread());
3252 }
3253 }
3254
3255 ////////////////////////////////////////////////////////////////////////////////
3256 // debug support
3257
3258 bool os::find(address addr, outputStream* st) {
3259 Dl_info dlinfo;
3260 memset(&dlinfo, 0, sizeof(dlinfo));
3261 if (dladdr(addr, &dlinfo) != 0) {
3262 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3263 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3264 st->print("%s+%#x", dlinfo.dli_sname,
3265 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3266 } else if (dlinfo.dli_fbase != NULL) {
3267 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3268 } else {
3269 st->print("<absolute address>");
3270 }
3271 if (dlinfo.dli_fname != NULL) {
3272 st->print(" in %s", dlinfo.dli_fname);
3273 }
3274 if (dlinfo.dli_fbase != NULL) {
3275 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3276 }
3277 st->cr();
3278
3279 if (Verbose) {
3280 // decode some bytes around the PC
3281 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3282 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3283 address lowest = (address) dlinfo.dli_sname;
3284 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3285 if (begin < lowest) begin = lowest;
3286 Dl_info dlinfo2;
3287 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3288 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3289 end = (address) dlinfo2.dli_saddr;
3290 }
3291 Disassembler::decode(begin, end, st);
3292 }
3293 return true;
3294 }
3295 return false;
3296 }
3297
3298 ////////////////////////////////////////////////////////////////////////////////
3299 // misc
3300
3301 // This does not do anything on Bsd. This is basically a hook for being
3302 // able to use structured exception handling (thread-local exception filters)
3303 // on, e.g., Win32.
3304 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3305 const methodHandle& method, JavaCallArguments* args,
3306 Thread* thread) {
3307 f(value, method, args, thread);
3308 }
3309
3310 void os::print_statistics() {
3311 }
3312
3313 bool os::message_box(const char* title, const char* message) {
3314 int i;
3315 fdStream err(defaultStream::error_fd());
3316 for (i = 0; i < 78; i++) err.print_raw("=");
3317 err.cr();
3318 err.print_raw_cr(title);
3319 for (i = 0; i < 78; i++) err.print_raw("-");
3320 err.cr();
3321 err.print_raw_cr(message);
3322 for (i = 0; i < 78; i++) err.print_raw("=");
3323 err.cr();
3324
3325 char buf[16];
3326 // Prevent process from exiting upon "read error" without consuming all CPU
3327 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3328
3329 return buf[0] == 'y' || buf[0] == 'Y';
3330 }
3331
3332 static inline struct timespec get_mtime(const char* filename) {
3333 struct stat st;
3334 int ret = os::stat(filename, &st);
3335 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3336 #ifdef __APPLE__
3337 return st.st_mtimespec;
3338 #else
3339 return st.st_mtim;
3340 #endif
3341 }
3342
3343 int os::compare_file_modified_times(const char* file1, const char* file2) {
3344 struct timespec filetime1 = get_mtime(file1);
3345 struct timespec filetime2 = get_mtime(file2);
3346 int diff = filetime1.tv_sec - filetime2.tv_sec;
3347 if (diff == 0) {
3348 return filetime1.tv_nsec - filetime2.tv_nsec;
3349 }
3350 return diff;
3351 }
3352
3353 // Is a (classpath) directory empty?
3354 bool os::dir_is_empty(const char* path) {
3355 DIR *dir = NULL;
3356 struct dirent *ptr;
3357
3358 dir = opendir(path);
3359 if (dir == NULL) return true;
3360
3361 // Scan the directory
3362 bool result = true;
3363 while (result && (ptr = readdir(dir)) != NULL) {
3364 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3365 result = false;
3366 }
3367 }
3368 closedir(dir);
3369 return result;
3370 }
3371
3372 // This code originates from JDK's sysOpen and open64_w
3373 // from src/solaris/hpi/src/system_md.c
3374
3375 int os::open(const char *path, int oflag, int mode) {
3376 if (strlen(path) > MAX_PATH - 1) {
3377 errno = ENAMETOOLONG;
3378 return -1;
3379 }
3380 int fd;
3381
3382 fd = ::open(path, oflag, mode);
3383 if (fd == -1) return -1;
3384
3385 // If the open succeeded, the file might still be a directory
3386 {
3387 struct stat buf;
3388 int ret = ::fstat(fd, &buf);
3389 int st_mode = buf.st_mode;
3390
3391 if (ret != -1) {
3392 if ((st_mode & S_IFMT) == S_IFDIR) {
3393 errno = EISDIR;
3394 ::close(fd);
3395 return -1;
3396 }
3397 } else {
3398 ::close(fd);
3399 return -1;
3400 }
3401 }
3402
3403 // All file descriptors that are opened in the JVM and not
3404 // specifically destined for a subprocess should have the
3405 // close-on-exec flag set. If we don't set it, then careless 3rd
3406 // party native code might fork and exec without closing all
3407 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3408 // UNIXProcess.c), and this in turn might:
3409 //
3410 // - cause end-of-file to fail to be detected on some file
3411 // descriptors, resulting in mysterious hangs, or
3412 //
3413 // - might cause an fopen in the subprocess to fail on a system
3414 // suffering from bug 1085341.
3415 //
3416 // (Yes, the default setting of the close-on-exec flag is a Unix
3417 // design flaw)
3418 //
3419 // See:
3420 // 1085341: 32-bit stdio routines should support file descriptors >255
3421 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3422 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3423 //
3424 #ifdef FD_CLOEXEC
3425 {
3426 int flags = ::fcntl(fd, F_GETFD);
3427 if (flags != -1) {
3428 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3429 }
3430 }
3431 #endif
3432
3433 return fd;
3434 }
3435
3436
3437 // create binary file, rewriting existing file if required
3438 int os::create_binary_file(const char* path, bool rewrite_existing) {
3439 int oflags = O_WRONLY | O_CREAT;
3440 if (!rewrite_existing) {
3441 oflags |= O_EXCL;
3442 }
3443 return ::open(path, oflags, S_IREAD | S_IWRITE);
3444 }
3445
3446 // return current position of file pointer
3447 jlong os::current_file_offset(int fd) {
3448 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3449 }
3450
3451 // move file pointer to the specified offset
3452 jlong os::seek_to_file_offset(int fd, jlong offset) {
3453 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3454 }
3455
3456 // This code originates from JDK's sysAvailable
3457 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3458
3459 int os::available(int fd, jlong *bytes) {
3460 jlong cur, end;
3461 int mode;
3462 struct stat buf;
3463
3464 if (::fstat(fd, &buf) >= 0) {
3465 mode = buf.st_mode;
3466 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3467 int n;
3468 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3469 *bytes = n;
3470 return 1;
3471 }
3472 }
3473 }
3474 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3475 return 0;
3476 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3477 return 0;
3478 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3479 return 0;
3480 }
3481 *bytes = end - cur;
3482 return 1;
3483 }
3484
3485 // Map a block of memory.
3486 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3487 char *addr, size_t bytes, bool read_only,
3488 bool allow_exec) {
3489 int prot;
3490 int flags;
3491
3492 if (read_only) {
3493 prot = PROT_READ;
3494 flags = MAP_SHARED;
3495 } else {
3496 prot = PROT_READ | PROT_WRITE;
3497 flags = MAP_PRIVATE;
3498 }
3499
3500 if (allow_exec) {
3501 prot |= PROT_EXEC;
3502 }
3503
3504 if (addr != NULL) {
3505 flags |= MAP_FIXED;
3506 }
3507
3508 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3509 fd, file_offset);
3510 if (mapped_address == MAP_FAILED) {
3511 return NULL;
3512 }
3513 return mapped_address;
3514 }
3515
3516
3517 // Remap a block of memory.
3518 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3519 char *addr, size_t bytes, bool read_only,
3520 bool allow_exec) {
3521 // same as map_memory() on this OS
3522 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3523 allow_exec);
3524 }
3525
3526
3527 // Unmap a block of memory.
3528 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3529 return munmap(addr, bytes) == 0;
3530 }
3531
3532 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3533 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3534 // of a thread.
3535 //
3536 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3537 // the fast estimate available on the platform.
3538
3539 jlong os::current_thread_cpu_time() {
3540 #ifdef __APPLE__
3541 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3542 #else
3543 Unimplemented();
3544 return 0;
3545 #endif
3546 }
3547
3548 jlong os::thread_cpu_time(Thread* thread) {
3549 #ifdef __APPLE__
3550 return os::thread_cpu_time(thread, true /* user + sys */);
3551 #else
3552 Unimplemented();
3553 return 0;
3554 #endif
3555 }
3556
3557 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3558 #ifdef __APPLE__
3559 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3560 #else
3561 Unimplemented();
3562 return 0;
3563 #endif
3564 }
3565
3566 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3567 #ifdef __APPLE__
3568 struct thread_basic_info tinfo;
3569 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3570 kern_return_t kr;
3571 thread_t mach_thread;
3572
3573 mach_thread = thread->osthread()->thread_id();
3574 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3575 if (kr != KERN_SUCCESS) {
3576 return -1;
3577 }
3578
3579 if (user_sys_cpu_time) {
3580 jlong nanos;
3581 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3582 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3583 return nanos;
3584 } else {
3585 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3586 }
3587 #else
3588 Unimplemented();
3589 return 0;
3590 #endif
3591 }
3592
3593
3594 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3595 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3596 info_ptr->may_skip_backward = false; // elapsed time not wall time
3597 info_ptr->may_skip_forward = false; // elapsed time not wall time
3598 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3599 }
3600
3601 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3602 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3603 info_ptr->may_skip_backward = false; // elapsed time not wall time
3604 info_ptr->may_skip_forward = false; // elapsed time not wall time
3605 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3606 }
3607
3608 bool os::is_thread_cpu_time_supported() {
3609 #ifdef __APPLE__
3610 return true;
3611 #else
3612 return false;
3613 #endif
3614 }
3615
3616 // System loadavg support. Returns -1 if load average cannot be obtained.
3617 // Bsd doesn't yet have a (official) notion of processor sets,
3618 // so just return the system wide load average.
3619 int os::loadavg(double loadavg[], int nelem) {
3620 return ::getloadavg(loadavg, nelem);
3621 }
3622
3623 void os::pause() {
3624 char filename[MAX_PATH];
3625 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3626 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
3627 } else {
3628 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3629 }
3630
3631 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3632 if (fd != -1) {
3633 struct stat buf;
3634 ::close(fd);
3635 while (::stat(filename, &buf) == 0) {
3636 (void)::poll(NULL, 0, 100);
3637 }
3638 } else {
3639 jio_fprintf(stderr,
3640 "Could not open pause file '%s', continuing immediately.\n", filename);
3641 }
3642 }
3643
3644 // Darwin has no "environ" in a dynamic library.
3645 #ifdef __APPLE__
3646 #include <crt_externs.h>
3647 #define environ (*_NSGetEnviron())
3648 #else
3649 extern char** environ;
3650 #endif
3651
3652 // Run the specified command in a separate process. Return its exit value,
3653 // or -1 on failure (e.g. can't fork a new process).
3654 // Unlike system(), this function can be called from signal handler. It
3655 // doesn't block SIGINT et al.
3656 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3657 const char * argv[4] = {"sh", "-c", cmd, NULL};
3658
3659 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3660 // pthread_atfork handlers and reset pthread library. All we need is a
3661 // separate process to execve. Make a direct syscall to fork process.
3662 // On IA64 there's no fork syscall, we have to use fork() and hope for
3663 // the best...
3664 pid_t pid = fork();
3665
3666 if (pid < 0) {
3667 // fork failed
3668 return -1;
3669
3670 } else if (pid == 0) {
3671 // child process
3672
3673 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3674 // first to kill every thread on the thread list. Because this list is
3675 // not reset by fork() (see notes above), execve() will instead kill
3676 // every thread in the parent process. We know this is the only thread
3677 // in the new process, so make a system call directly.
3678 // IA64 should use normal execve() from glibc to match the glibc fork()
3679 // above.
3680 execve("/bin/sh", (char* const*)argv, environ);
3681
3682 // execve failed
3683 _exit(-1);
3684
3685 } else {
3686 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3687 // care about the actual exit code, for now.
3688
3689 int status;
3690
3691 // Wait for the child process to exit. This returns immediately if
3692 // the child has already exited. */
3693 while (waitpid(pid, &status, 0) < 0) {
3694 switch (errno) {
3695 case ECHILD: return 0;
3696 case EINTR: break;
3697 default: return -1;
3698 }
3699 }
3700
3701 if (WIFEXITED(status)) {
3702 // The child exited normally; get its exit code.
3703 return WEXITSTATUS(status);
3704 } else if (WIFSIGNALED(status)) {
3705 // The child exited because of a signal
3706 // The best value to return is 0x80 + signal number,
3707 // because that is what all Unix shells do, and because
3708 // it allows callers to distinguish between process exit and
3709 // process death by signal.
3710 return 0x80 + WTERMSIG(status);
3711 } else {
3712 // Unknown exit code; pass it through
3713 return status;
3714 }
3715 }
3716 }
3717
3718 // Get the kern.corefile setting, or otherwise the default path to the core file
3719 // Returns the length of the string
3720 int os::get_core_path(char* buffer, size_t bufferSize) {
3721 int n = 0;
3722 #ifdef __APPLE__
3723 char coreinfo[MAX_PATH];
3724 size_t sz = sizeof(coreinfo);
3725 int ret = sysctlbyname("kern.corefile", coreinfo, &sz, NULL, 0);
3726 if (ret == 0) {
3727 char *pid_pos = strstr(coreinfo, "%P");
3728 // skip over the "%P" to preserve any optional custom user pattern
3729 const char* tail = (pid_pos != NULL) ? (pid_pos + 2) : "";
3730
3731 if (pid_pos != NULL) {
3732 *pid_pos = '\0';
3733 n = jio_snprintf(buffer, bufferSize, "%s%d%s", coreinfo, os::current_process_id(), tail);
3734 } else {
3735 n = jio_snprintf(buffer, bufferSize, "%s", coreinfo);
3736 }
3737 } else
3738 #endif
3739 {
3740 n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", os::current_process_id());
3741 }
3742 // Truncate if theoretical string was longer than bufferSize
3743 n = MIN2(n, (int)bufferSize);
3744
3745 return n;
3746 }
3747
3748 bool os::supports_map_sync() {
3749 return false;
3750 }
3751
3752 #ifndef PRODUCT
3753 void TestReserveMemorySpecial_test() {
3754 // No tests available for this platform
3755 }
3756 #endif
3757
3758 bool os::start_debugging(char *buf, int buflen) {
3759 int len = (int)strlen(buf);
3760 char *p = &buf[len];
3761
3762 jio_snprintf(p, buflen-len,
3763 "\n\n"
3764 "Do you want to debug the problem?\n\n"
3765 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3766 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3767 "Otherwise, press RETURN to abort...",
3768 os::current_process_id(), os::current_process_id(),
3769 os::current_thread_id(), os::current_thread_id());
3770
3771 bool yes = os::message_box("Unexpected Error", buf);
3772
3773 if (yes) {
3774 // yes, user asked VM to launch debugger
3775 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3776 os::current_process_id(), os::current_process_id());
3777
3778 os::fork_and_exec(buf);
3779 yes = false;
3780 }
3781 return yes;
3782 }