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