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