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