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