1 /*
2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_bsd.inline.hpp"
40 #include "os_share_bsd.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/interfaceSupport.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/orderAccess.inline.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/threadCritical.hpp"
60 #include "runtime/timer.hpp"
61 #include "semaphore_bsd.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/memTracker.hpp"
64 #include "services/runtimeService.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 // put OS-includes here
73 # include <sys/types.h>
74 # include <sys/mman.h>
75 # include <sys/stat.h>
76 # include <sys/select.h>
77 # include <pthread.h>
78 # include <signal.h>
79 # include <errno.h>
80 # include <dlfcn.h>
81 # include <stdio.h>
82 # include <unistd.h>
83 # include <sys/resource.h>
84 # include <pthread.h>
85 # include <sys/stat.h>
86 # include <sys/time.h>
87 # include <sys/times.h>
88 # include <sys/utsname.h>
89 # include <sys/socket.h>
90 # include <sys/wait.h>
91 # include <time.h>
92 # include <pwd.h>
93 # include <poll.h>
94 # include <semaphore.h>
95 # include <fcntl.h>
96 # include <string.h>
97 # include <sys/param.h>
98 # include <sys/sysctl.h>
99 # include <sys/ipc.h>
100 # include <sys/shm.h>
101 #ifndef __APPLE__
102 # include <link.h>
103 #endif
104 # include <stdint.h>
105 # include <inttypes.h>
106 # include <sys/ioctl.h>
107 # include <sys/syscall.h>
108
109 #if defined(__FreeBSD__) || defined(__NetBSD__)
110 #include <elf.h>
111 #endif
112
113 #ifdef __APPLE__
114 #include <mach/mach.h> // semaphore_* API
115 #include <mach-o/dyld.h>
116 #include <sys/proc_info.h>
117 #include <objc/objc-auto.h>
118 #endif
119
120 #ifndef MAP_ANONYMOUS
121 #define MAP_ANONYMOUS MAP_ANON
122 #endif
123
124 #define MAX_PATH (2 * K)
125
126 // for timer info max values which include all bits
127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
128
129 #define LARGEPAGES_BIT (1 << 6)
130
131 ////////////////////////////////////////////////////////////////////////////////
132 // global variables
133 julong os::Bsd::_physical_memory = 0;
134
135 #ifdef __APPLE__
136 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
137 volatile uint64_t os::Bsd::_max_abstime = 0;
138 #else
139 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
140 #endif
141 pthread_t os::Bsd::_main_thread;
142 int os::Bsd::_page_size = -1;
143
144 static jlong initial_time_count=0;
145
146 static int clock_tics_per_sec = 100;
147
148 // For diagnostics to print a message once. see run_periodic_checks
149 static sigset_t check_signal_done;
150 static bool check_signals = true;
151
152 static pid_t _initial_pid = 0;
153
154 // Signal number used to suspend/resume a thread
155
156 // do not use any signal number less than SIGSEGV, see 4355769
157 static int SR_signum = SIGUSR2;
158 sigset_t SR_sigset;
159
160
161 ////////////////////////////////////////////////////////////////////////////////
162 // utility functions
163
164 static int SR_initialize();
165
166 julong os::available_memory() {
167 return Bsd::available_memory();
168 }
169
170 // available here means free
171 julong os::Bsd::available_memory() {
172 uint64_t available = physical_memory() >> 2;
173 #ifdef __APPLE__
174 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
175 vm_statistics64_data_t vmstat;
176 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
177 (host_info64_t)&vmstat, &count);
178 assert(kerr == KERN_SUCCESS,
179 "host_statistics64 failed - check mach_host_self() and count");
180 if (kerr == KERN_SUCCESS) {
181 available = vmstat.free_count * os::vm_page_size();
182 }
183 #endif
184 return available;
185 }
186
187 julong os::physical_memory() {
188 return Bsd::physical_memory();
189 }
190
191 // Return true if user is running as root.
192
193 bool os::have_special_privileges() {
194 static bool init = false;
195 static bool privileges = false;
196 if (!init) {
197 privileges = (getuid() != geteuid()) || (getgid() != getegid());
198 init = true;
199 }
200 return privileges;
201 }
202
203
204
205 // Cpu architecture string
206 #if defined(ZERO)
207 static char cpu_arch[] = ZERO_LIBARCH;
208 #elif defined(IA64)
209 static char cpu_arch[] = "ia64";
210 #elif defined(IA32)
211 static char cpu_arch[] = "i386";
212 #elif defined(AMD64)
213 static char cpu_arch[] = "amd64";
214 #elif defined(ARM)
215 static char cpu_arch[] = "arm";
216 #elif defined(PPC32)
217 static char cpu_arch[] = "ppc";
218 #elif defined(SPARC)
219 #ifdef _LP64
220 static char cpu_arch[] = "sparcv9";
221 #else
222 static char cpu_arch[] = "sparc";
223 #endif
224 #else
225 #error Add appropriate cpu_arch setting
226 #endif
227
228 // Compiler variant
229 #ifdef COMPILER2
230 #define COMPILER_VARIANT "server"
231 #else
232 #define COMPILER_VARIANT "client"
233 #endif
234
235
236 void os::Bsd::initialize_system_info() {
237 int mib[2];
238 size_t len;
239 int cpu_val;
240 julong mem_val;
241
242 // get processors count via hw.ncpus sysctl
243 mib[0] = CTL_HW;
244 mib[1] = HW_NCPU;
245 len = sizeof(cpu_val);
246 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
247 assert(len == sizeof(cpu_val), "unexpected data size");
248 set_processor_count(cpu_val);
249 } else {
250 set_processor_count(1); // fallback
251 }
252
253 // get physical memory via hw.memsize sysctl (hw.memsize is used
254 // since it returns a 64 bit value)
255 mib[0] = CTL_HW;
256
257 #if defined (HW_MEMSIZE) // Apple
258 mib[1] = HW_MEMSIZE;
259 #elif defined(HW_PHYSMEM) // Most of BSD
260 mib[1] = HW_PHYSMEM;
261 #elif defined(HW_REALMEM) // Old FreeBSD
262 mib[1] = HW_REALMEM;
263 #else
264 #error No ways to get physmem
265 #endif
266
267 len = sizeof(mem_val);
268 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
269 assert(len == sizeof(mem_val), "unexpected data size");
270 _physical_memory = mem_val;
271 } else {
272 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
273 }
274
275 #ifdef __OpenBSD__
276 {
277 // limit _physical_memory memory view on OpenBSD since
278 // datasize rlimit restricts us anyway.
279 struct rlimit limits;
280 getrlimit(RLIMIT_DATA, &limits);
281 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
282 }
283 #endif
284 }
285
286 #ifdef __APPLE__
287 static const char *get_home() {
288 const char *home_dir = ::getenv("HOME");
289 if ((home_dir == NULL) || (*home_dir == '\0')) {
290 struct passwd *passwd_info = getpwuid(geteuid());
291 if (passwd_info != NULL) {
292 home_dir = passwd_info->pw_dir;
293 }
294 }
295
296 return home_dir;
297 }
298 #endif
299
300 void os::init_system_properties_values() {
301 // The next steps are taken in the product version:
302 //
303 // Obtain the JAVA_HOME value from the location of libjvm.so.
304 // This library should be located at:
305 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
306 //
307 // If "/jre/lib/" appears at the right place in the path, then we
308 // assume libjvm.so is installed in a JDK and we use this path.
309 //
310 // Otherwise exit with message: "Could not create the Java virtual machine."
311 //
312 // The following extra steps are taken in the debugging version:
313 //
314 // If "/jre/lib/" does NOT appear at the right place in the path
315 // instead of exit check for $JAVA_HOME environment variable.
316 //
317 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
318 // then we append a fake suffix "hotspot/libjvm.so" to this path so
319 // it looks like libjvm.so is installed there
320 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
321 //
322 // Otherwise exit.
323 //
324 // Important note: if the location of libjvm.so changes this
325 // code needs to be changed accordingly.
326
327 // See ld(1):
328 // The linker uses the following search paths to locate required
329 // shared libraries:
330 // 1: ...
331 // ...
332 // 7: The default directories, normally /lib and /usr/lib.
333 #ifndef DEFAULT_LIBPATH
334 #define DEFAULT_LIBPATH "/lib:/usr/lib"
335 #endif
336
337 // Base path of extensions installed on the system.
338 #define SYS_EXT_DIR "/usr/java/packages"
339 #define EXTENSIONS_DIR "/lib/ext"
340
341 #ifndef __APPLE__
342
343 // Buffer that fits several sprintfs.
344 // Note that the space for the colon and the trailing null are provided
345 // by the nulls included by the sizeof operator.
346 const size_t bufsize =
347 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
348 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
349 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
350
351 // sysclasspath, java_home, dll_dir
352 {
353 char *pslash;
354 os::jvm_path(buf, bufsize);
355
356 // Found the full path to libjvm.so.
357 // Now cut the path to <java_home>/jre if we can.
358 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
359 pslash = strrchr(buf, '/');
360 if (pslash != NULL) {
361 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
362 }
363 Arguments::set_dll_dir(buf);
364
365 if (pslash != NULL) {
366 pslash = strrchr(buf, '/');
367 if (pslash != NULL) {
368 *pslash = '\0'; // Get rid of /<arch>.
369 pslash = strrchr(buf, '/');
370 if (pslash != NULL) {
371 *pslash = '\0'; // Get rid of /lib.
372 }
373 }
374 }
375 Arguments::set_java_home(buf);
376 set_boot_path('/', ':');
377 }
378
379 // Where to look for native libraries.
380 //
381 // Note: Due to a legacy implementation, most of the library path
382 // is set in the launcher. This was to accomodate linking restrictions
383 // on legacy Bsd implementations (which are no longer supported).
384 // Eventually, all the library path setting will be done here.
385 //
386 // However, to prevent the proliferation of improperly built native
387 // libraries, the new path component /usr/java/packages is added here.
388 // Eventually, all the library path setting will be done here.
389 {
390 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
391 // should always exist (until the legacy problem cited above is
392 // addressed).
393 const char *v = ::getenv("LD_LIBRARY_PATH");
394 const char *v_colon = ":";
395 if (v == NULL) { v = ""; v_colon = ""; }
396 // That's +1 for the colon and +1 for the trailing '\0'.
397 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
398 strlen(v) + 1 +
399 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
400 mtInternal);
401 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
402 Arguments::set_library_path(ld_library_path);
403 FREE_C_HEAP_ARRAY(char, ld_library_path);
404 }
405
406 // Extensions directories.
407 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
408 Arguments::set_ext_dirs(buf);
409
410 FREE_C_HEAP_ARRAY(char, buf);
411
412 #else // __APPLE__
413
414 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
415 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
416
417 const char *user_home_dir = get_home();
418 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
419 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
420 sizeof(SYS_EXTENSIONS_DIRS);
421
422 // Buffer that fits several sprintfs.
423 // Note that the space for the colon and the trailing null are provided
424 // by the nulls included by the sizeof operator.
425 const size_t bufsize =
426 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
427 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
428 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
429
430 // sysclasspath, java_home, dll_dir
431 {
432 char *pslash;
433 os::jvm_path(buf, bufsize);
434
435 // Found the full path to libjvm.so.
436 // Now cut the path to <java_home>/jre if we can.
437 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
438 pslash = strrchr(buf, '/');
439 if (pslash != NULL) {
440 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
441 }
442 #ifdef STATIC_BUILD
443 strcat(buf, "/lib");
444 #endif
445
446 Arguments::set_dll_dir(buf);
447
448 if (pslash != NULL) {
449 pslash = strrchr(buf, '/');
450 if (pslash != NULL) {
451 *pslash = '\0'; // Get rid of /lib.
452 }
453 }
454 Arguments::set_java_home(buf);
455 set_boot_path('/', ':');
456 }
457
458 // Where to look for native libraries.
459 //
460 // Note: Due to a legacy implementation, most of the library path
461 // is set in the launcher. This was to accomodate linking restrictions
462 // on legacy Bsd implementations (which are no longer supported).
463 // Eventually, all the library path setting will be done here.
464 //
465 // However, to prevent the proliferation of improperly built native
466 // libraries, the new path component /usr/java/packages is added here.
467 // Eventually, all the library path setting will be done here.
468 {
469 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
470 // should always exist (until the legacy problem cited above is
471 // addressed).
472 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
473 // can specify a directory inside an app wrapper
474 const char *l = ::getenv("JAVA_LIBRARY_PATH");
475 const char *l_colon = ":";
476 if (l == NULL) { l = ""; l_colon = ""; }
477
478 const char *v = ::getenv("DYLD_LIBRARY_PATH");
479 const char *v_colon = ":";
480 if (v == NULL) { v = ""; v_colon = ""; }
481
482 // Apple's Java6 has "." at the beginning of java.library.path.
483 // OpenJDK on Windows has "." at the end of java.library.path.
484 // OpenJDK on Linux and Solaris don't have "." in java.library.path
485 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
486 // "." is appended to the end of java.library.path. Yes, this
487 // could cause a change in behavior, but Apple's Java6 behavior
488 // can be achieved by putting "." at the beginning of the
489 // JAVA_LIBRARY_PATH environment variable.
490 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
491 strlen(v) + 1 + strlen(l) + 1 +
492 system_ext_size + 3,
493 mtInternal);
494 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
495 v, v_colon, l, l_colon, user_home_dir);
496 Arguments::set_library_path(ld_library_path);
497 FREE_C_HEAP_ARRAY(char, ld_library_path);
498 }
499
500 // Extensions directories.
501 //
502 // Note that the space for the colon and the trailing null are provided
503 // by the nulls included by the sizeof operator (so actually one byte more
504 // than necessary is allocated).
505 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
506 user_home_dir, Arguments::get_java_home());
507 Arguments::set_ext_dirs(buf);
508
509 FREE_C_HEAP_ARRAY(char, buf);
510
511 #undef SYS_EXTENSIONS_DIR
512 #undef SYS_EXTENSIONS_DIRS
513
514 #endif // __APPLE__
515
516 #undef SYS_EXT_DIR
517 #undef EXTENSIONS_DIR
518 }
519
520 ////////////////////////////////////////////////////////////////////////////////
521 // breakpoint support
522
523 void os::breakpoint() {
524 BREAKPOINT;
525 }
526
527 extern "C" void breakpoint() {
528 // use debugger to set breakpoint here
529 }
530
531 ////////////////////////////////////////////////////////////////////////////////
532 // signal support
533
534 debug_only(static bool signal_sets_initialized = false);
535 static sigset_t unblocked_sigs, vm_sigs;
536
537 bool os::Bsd::is_sig_ignored(int sig) {
538 struct sigaction oact;
539 sigaction(sig, (struct sigaction*)NULL, &oact);
540 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
541 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
542 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
543 return true;
544 } else {
545 return false;
546 }
547 }
548
549 void os::Bsd::signal_sets_init() {
550 // Should also have an assertion stating we are still single-threaded.
551 assert(!signal_sets_initialized, "Already initialized");
552 // Fill in signals that are necessarily unblocked for all threads in
553 // the VM. Currently, we unblock the following signals:
554 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
555 // by -Xrs (=ReduceSignalUsage));
556 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
557 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
558 // the dispositions or masks wrt these signals.
559 // Programs embedding the VM that want to use the above signals for their
560 // own purposes must, at this time, use the "-Xrs" option to prevent
561 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
562 // (See bug 4345157, and other related bugs).
563 // In reality, though, unblocking these signals is really a nop, since
564 // these signals are not blocked by default.
565 sigemptyset(&unblocked_sigs);
566 sigaddset(&unblocked_sigs, SIGILL);
567 sigaddset(&unblocked_sigs, SIGSEGV);
568 sigaddset(&unblocked_sigs, SIGBUS);
569 sigaddset(&unblocked_sigs, SIGFPE);
570 sigaddset(&unblocked_sigs, SR_signum);
571
572 if (!ReduceSignalUsage) {
573 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
574 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
575
576 }
577 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
578 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
579 }
580 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
581 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
582 }
583 }
584 // Fill in signals that are blocked by all but the VM thread.
585 sigemptyset(&vm_sigs);
586 if (!ReduceSignalUsage) {
587 sigaddset(&vm_sigs, BREAK_SIGNAL);
588 }
589 debug_only(signal_sets_initialized = true);
590
591 }
592
593 // These are signals that are unblocked while a thread is running Java.
594 // (For some reason, they get blocked by default.)
595 sigset_t* os::Bsd::unblocked_signals() {
596 assert(signal_sets_initialized, "Not initialized");
597 return &unblocked_sigs;
598 }
599
600 // These are the signals that are blocked while a (non-VM) thread is
601 // running Java. Only the VM thread handles these signals.
602 sigset_t* os::Bsd::vm_signals() {
603 assert(signal_sets_initialized, "Not initialized");
604 return &vm_sigs;
605 }
606
607 void os::Bsd::hotspot_sigmask(Thread* thread) {
608
609 //Save caller's signal mask before setting VM signal mask
610 sigset_t caller_sigmask;
611 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
612
613 OSThread* osthread = thread->osthread();
614 osthread->set_caller_sigmask(caller_sigmask);
615
616 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
617
618 if (!ReduceSignalUsage) {
619 if (thread->is_VM_thread()) {
620 // Only the VM thread handles BREAK_SIGNAL ...
621 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
622 } else {
623 // ... all other threads block BREAK_SIGNAL
624 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
625 }
626 }
627 }
628
629
630 //////////////////////////////////////////////////////////////////////////////
631 // create new thread
632
633 #ifdef __APPLE__
634 // library handle for calling objc_registerThreadWithCollector()
635 // without static linking to the libobjc library
636 #define OBJC_LIB "/usr/lib/libobjc.dylib"
637 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
638 typedef void (*objc_registerThreadWithCollector_t)();
639 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
640 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
641 #endif
642
643 #ifdef __APPLE__
644 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
645 // Additional thread_id used to correlate threads in SA
646 thread_identifier_info_data_t m_ident_info;
647 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
648
649 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
650 (thread_info_t) &m_ident_info, &count);
651
652 return m_ident_info.thread_id;
653 }
654 #endif
655
656 // Thread start routine for all newly created threads
657 static void *thread_native_entry(Thread *thread) {
658 // Try to randomize the cache line index of hot stack frames.
659 // This helps when threads of the same stack traces evict each other's
660 // cache lines. The threads can be either from the same JVM instance, or
661 // from different JVM instances. The benefit is especially true for
662 // processors with hyperthreading technology.
663 static int counter = 0;
664 int pid = os::current_process_id();
665 alloca(((pid ^ counter++) & 7) * 128);
666
667 thread->initialize_thread_current();
668
669 OSThread* osthread = thread->osthread();
670 Monitor* sync = osthread->startThread_lock();
671
672 osthread->set_thread_id(os::Bsd::gettid());
673
674 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
675 os::current_thread_id(), (uintx) pthread_self());
676
677 #ifdef __APPLE__
678 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
679 guarantee(unique_thread_id != 0, "unique thread id was not found");
680 osthread->set_unique_thread_id(unique_thread_id);
681 #endif
682 // initialize signal mask for this thread
683 os::Bsd::hotspot_sigmask(thread);
684
685 // initialize floating point control register
686 os::Bsd::init_thread_fpu_state();
687
688 #ifdef __APPLE__
689 // register thread with objc gc
690 if (objc_registerThreadWithCollectorFunction != NULL) {
691 objc_registerThreadWithCollectorFunction();
692 }
693 #endif
694
695 // handshaking with parent thread
696 {
697 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
698
699 // notify parent thread
700 osthread->set_state(INITIALIZED);
701 sync->notify_all();
702
703 // wait until os::start_thread()
704 while (osthread->get_state() == INITIALIZED) {
705 sync->wait(Mutex::_no_safepoint_check_flag);
706 }
707 }
708
709 // call one more level start routine
710 thread->run();
711
712 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
713 os::current_thread_id(), (uintx) pthread_self());
714
715 // If a thread has not deleted itself ("delete this") as part of its
716 // termination sequence, we have to ensure thread-local-storage is
717 // cleared before we actually terminate. No threads should ever be
718 // deleted asynchronously with respect to their termination.
719 if (Thread::current_or_null_safe() != NULL) {
720 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
721 thread->clear_thread_current();
722 }
723
724 return 0;
725 }
726
727 bool os::create_thread(Thread* thread, ThreadType thr_type,
728 size_t req_stack_size) {
729 assert(thread->osthread() == NULL, "caller responsible");
730
731 // Allocate the OSThread object
732 OSThread* osthread = new OSThread(NULL, NULL);
733 if (osthread == NULL) {
734 return false;
735 }
736
737 // set the correct thread state
738 osthread->set_thread_type(thr_type);
739
740 // Initial state is ALLOCATED but not INITIALIZED
741 osthread->set_state(ALLOCATED);
742
743 thread->set_osthread(osthread);
744
745 // init thread attributes
746 pthread_attr_t attr;
747 pthread_attr_init(&attr);
748 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
749
750 // calculate stack size if it's not specified by caller
751 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
752 int status = pthread_attr_setstacksize(&attr, stack_size);
753 assert_status(status == 0, status, "pthread_attr_setstacksize");
754
755 ThreadState state;
756
757 {
758 pthread_t tid;
759 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
760
761 char buf[64];
762 if (ret == 0) {
763 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
764 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
765 } else {
766 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
767 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
768 }
769
770 pthread_attr_destroy(&attr);
771
772 if (ret != 0) {
773 // Need to clean up stuff we've allocated so far
774 thread->set_osthread(NULL);
775 delete osthread;
776 return false;
777 }
778
779 // Store pthread info into the OSThread
780 osthread->set_pthread_id(tid);
781
782 // Wait until child thread is either initialized or aborted
783 {
784 Monitor* sync_with_child = osthread->startThread_lock();
785 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
786 while ((state = osthread->get_state()) == ALLOCATED) {
787 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
788 }
789 }
790
791 }
792
793 // Aborted due to thread limit being reached
794 if (state == ZOMBIE) {
795 thread->set_osthread(NULL);
796 delete osthread;
797 return false;
798 }
799
800 // The thread is returned suspended (in state INITIALIZED),
801 // and is started higher up in the call chain
802 assert(state == INITIALIZED, "race condition");
803 return true;
804 }
805
806 /////////////////////////////////////////////////////////////////////////////
807 // attach existing thread
808
809 // bootstrap the main thread
810 bool os::create_main_thread(JavaThread* thread) {
811 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
812 return create_attached_thread(thread);
813 }
814
815 bool os::create_attached_thread(JavaThread* thread) {
816 #ifdef ASSERT
817 thread->verify_not_published();
818 #endif
819
820 // Allocate the OSThread object
821 OSThread* osthread = new OSThread(NULL, NULL);
822
823 if (osthread == NULL) {
824 return false;
825 }
826
827 osthread->set_thread_id(os::Bsd::gettid());
828
829 // Store pthread info into the OSThread
830 #ifdef __APPLE__
831 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
832 guarantee(unique_thread_id != 0, "just checking");
833 osthread->set_unique_thread_id(unique_thread_id);
834 #endif
835 osthread->set_pthread_id(::pthread_self());
836
837 // initialize floating point control register
838 os::Bsd::init_thread_fpu_state();
839
840 // Initial thread state is RUNNABLE
841 osthread->set_state(RUNNABLE);
842
843 thread->set_osthread(osthread);
844
845 // initialize signal mask for this thread
846 // and save the caller's signal mask
847 os::Bsd::hotspot_sigmask(thread);
848
849 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
850 os::current_thread_id(), (uintx) pthread_self());
851
852 return true;
853 }
854
855 void os::pd_start_thread(Thread* thread) {
856 OSThread * osthread = thread->osthread();
857 assert(osthread->get_state() != INITIALIZED, "just checking");
858 Monitor* sync_with_child = osthread->startThread_lock();
859 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
860 sync_with_child->notify();
861 }
862
863 // Free Bsd resources related to the OSThread
864 void os::free_thread(OSThread* osthread) {
865 assert(osthread != NULL, "osthread not set");
866
867 // We are told to free resources of the argument thread,
868 // but we can only really operate on the current thread.
869 assert(Thread::current()->osthread() == osthread,
870 "os::free_thread but not current thread");
871
872 // Restore caller's signal mask
873 sigset_t sigmask = osthread->caller_sigmask();
874 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
875
876 delete osthread;
877 }
878
879 // Unlike Linux we don't try to handle the initial process
880 // thread in any special way - so just report 'false'
881 bool os::is_primordial_thread(void) {
882 return false;
883 }
884
885 ////////////////////////////////////////////////////////////////////////////////
886 // time support
887
888 // Time since start-up in seconds to a fine granularity.
889 // Used by VMSelfDestructTimer and the MemProfiler.
890 double os::elapsedTime() {
891
892 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
893 }
894
895 jlong os::elapsed_counter() {
896 return javaTimeNanos() - initial_time_count;
897 }
898
899 jlong os::elapsed_frequency() {
900 return NANOSECS_PER_SEC; // nanosecond resolution
901 }
902
903 bool os::supports_vtime() { return true; }
904 bool os::enable_vtime() { return false; }
905 bool os::vtime_enabled() { return false; }
906
907 double os::elapsedVTime() {
908 // better than nothing, but not much
909 return elapsedTime();
910 }
911
912 jlong os::javaTimeMillis() {
913 timeval time;
914 int status = gettimeofday(&time, NULL);
915 assert(status != -1, "bsd error");
916 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
917 }
918
919 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
920 timeval time;
921 int status = gettimeofday(&time, NULL);
922 assert(status != -1, "bsd error");
923 seconds = jlong(time.tv_sec);
924 nanos = jlong(time.tv_usec) * 1000;
925 }
926
927 #ifndef __APPLE__
928 #ifndef CLOCK_MONOTONIC
929 #define CLOCK_MONOTONIC (1)
930 #endif
931 #endif
932
933 #ifdef __APPLE__
934 void os::Bsd::clock_init() {
935 mach_timebase_info(&_timebase_info);
936 }
937 #else
938 void os::Bsd::clock_init() {
939 struct timespec res;
940 struct timespec tp;
941 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
942 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
943 // yes, monotonic clock is supported
944 _clock_gettime = ::clock_gettime;
945 }
946 }
947 #endif
948
949
950
951 #ifdef __APPLE__
952
953 jlong os::javaTimeNanos() {
954 const uint64_t tm = mach_absolute_time();
955 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
956 const uint64_t prev = Bsd::_max_abstime;
957 if (now <= prev) {
958 return prev; // same or retrograde time;
959 }
960 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
961 assert(obsv >= prev, "invariant"); // Monotonicity
962 // If the CAS succeeded then we're done and return "now".
963 // If the CAS failed and the observed value "obsv" is >= now then
964 // we should return "obsv". If the CAS failed and now > obsv > prv then
965 // some other thread raced this thread and installed a new value, in which case
966 // we could either (a) retry the entire operation, (b) retry trying to install now
967 // or (c) just return obsv. We use (c). No loop is required although in some cases
968 // we might discard a higher "now" value in deference to a slightly lower but freshly
969 // installed obsv value. That's entirely benign -- it admits no new orderings compared
970 // to (a) or (b) -- and greatly reduces coherence traffic.
971 // We might also condition (c) on the magnitude of the delta between obsv and now.
972 // Avoiding excessive CAS operations to hot RW locations is critical.
973 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
974 return (prev == obsv) ? now : obsv;
975 }
976
977 #else // __APPLE__
978
979 jlong os::javaTimeNanos() {
980 if (os::supports_monotonic_clock()) {
981 struct timespec tp;
982 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
983 assert(status == 0, "gettime error");
984 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
985 return result;
986 } else {
987 timeval time;
988 int status = gettimeofday(&time, NULL);
989 assert(status != -1, "bsd error");
990 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
991 return 1000 * usecs;
992 }
993 }
994
995 #endif // __APPLE__
996
997 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
998 if (os::supports_monotonic_clock()) {
999 info_ptr->max_value = ALL_64_BITS;
1000
1001 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1002 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1003 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1004 } else {
1005 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1006 info_ptr->max_value = ALL_64_BITS;
1007
1008 // gettimeofday is a real time clock so it skips
1009 info_ptr->may_skip_backward = true;
1010 info_ptr->may_skip_forward = true;
1011 }
1012
1013 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1014 }
1015
1016 // Return the real, user, and system times in seconds from an
1017 // arbitrary fixed point in the past.
1018 bool os::getTimesSecs(double* process_real_time,
1019 double* process_user_time,
1020 double* process_system_time) {
1021 struct tms ticks;
1022 clock_t real_ticks = times(&ticks);
1023
1024 if (real_ticks == (clock_t) (-1)) {
1025 return false;
1026 } else {
1027 double ticks_per_second = (double) clock_tics_per_sec;
1028 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1029 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1030 *process_real_time = ((double) real_ticks) / ticks_per_second;
1031
1032 return true;
1033 }
1034 }
1035
1036
1037 char * os::local_time_string(char *buf, size_t buflen) {
1038 struct tm t;
1039 time_t long_time;
1040 time(&long_time);
1041 localtime_r(&long_time, &t);
1042 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1043 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1044 t.tm_hour, t.tm_min, t.tm_sec);
1045 return buf;
1046 }
1047
1048 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1049 return localtime_r(clock, res);
1050 }
1051
1052 ////////////////////////////////////////////////////////////////////////////////
1053 // runtime exit support
1054
1055 // Note: os::shutdown() might be called very early during initialization, or
1056 // called from signal handler. Before adding something to os::shutdown(), make
1057 // sure it is async-safe and can handle partially initialized VM.
1058 void os::shutdown() {
1059
1060 // allow PerfMemory to attempt cleanup of any persistent resources
1061 perfMemory_exit();
1062
1063 // needs to remove object in file system
1064 AttachListener::abort();
1065
1066 // flush buffered output, finish log files
1067 ostream_abort();
1068
1069 // Check for abort hook
1070 abort_hook_t abort_hook = Arguments::abort_hook();
1071 if (abort_hook != NULL) {
1072 abort_hook();
1073 }
1074
1075 }
1076
1077 // Note: os::abort() might be called very early during initialization, or
1078 // called from signal handler. Before adding something to os::abort(), make
1079 // sure it is async-safe and can handle partially initialized VM.
1080 void os::abort(bool dump_core, void* siginfo, const void* context) {
1081 os::shutdown();
1082 if (dump_core) {
1083 #ifndef PRODUCT
1084 fdStream out(defaultStream::output_fd());
1085 out.print_raw("Current thread is ");
1086 char buf[16];
1087 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1088 out.print_raw_cr(buf);
1089 out.print_raw_cr("Dumping core ...");
1090 #endif
1091 ::abort(); // dump core
1092 }
1093
1094 ::exit(1);
1095 }
1096
1097 // Die immediately, no exit hook, no abort hook, no cleanup.
1098 void os::die() {
1099 // _exit() on BsdThreads only kills current thread
1100 ::abort();
1101 }
1102
1103 // This method is a copy of JDK's sysGetLastErrorString
1104 // from src/solaris/hpi/src/system_md.c
1105
1106 size_t os::lasterror(char *buf, size_t len) {
1107 if (errno == 0) return 0;
1108
1109 const char *s = os::strerror(errno);
1110 size_t n = ::strlen(s);
1111 if (n >= len) {
1112 n = len - 1;
1113 }
1114 ::strncpy(buf, s, n);
1115 buf[n] = '\0';
1116 return n;
1117 }
1118
1119 // Information of current thread in variety of formats
1120 pid_t os::Bsd::gettid() {
1121 int retval = -1;
1122
1123 #ifdef __APPLE__ //XNU kernel
1124 // despite the fact mach port is actually not a thread id use it
1125 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1126 retval = ::pthread_mach_thread_np(::pthread_self());
1127 guarantee(retval != 0, "just checking");
1128 return retval;
1129
1130 #else
1131 #ifdef __FreeBSD__
1132 retval = syscall(SYS_thr_self);
1133 #else
1134 #ifdef __OpenBSD__
1135 retval = syscall(SYS_getthrid);
1136 #else
1137 #ifdef __NetBSD__
1138 retval = (pid_t) syscall(SYS__lwp_self);
1139 #endif
1140 #endif
1141 #endif
1142 #endif
1143
1144 if (retval == -1) {
1145 return getpid();
1146 }
1147 }
1148
1149 intx os::current_thread_id() {
1150 #ifdef __APPLE__
1151 return (intx)::pthread_mach_thread_np(::pthread_self());
1152 #else
1153 return (intx)::pthread_self();
1154 #endif
1155 }
1156
1157 int os::current_process_id() {
1158
1159 // Under the old bsd thread library, bsd gives each thread
1160 // its own process id. Because of this each thread will return
1161 // a different pid if this method were to return the result
1162 // of getpid(2). Bsd provides no api that returns the pid
1163 // of the launcher thread for the vm. This implementation
1164 // returns a unique pid, the pid of the launcher thread
1165 // that starts the vm 'process'.
1166
1167 // Under the NPTL, getpid() returns the same pid as the
1168 // launcher thread rather than a unique pid per thread.
1169 // Use gettid() if you want the old pre NPTL behaviour.
1170
1171 // if you are looking for the result of a call to getpid() that
1172 // returns a unique pid for the calling thread, then look at the
1173 // OSThread::thread_id() method in osThread_bsd.hpp file
1174
1175 return (int)(_initial_pid ? _initial_pid : getpid());
1176 }
1177
1178 // DLL functions
1179
1180 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1181
1182 // This must be hard coded because it's the system's temporary
1183 // directory not the java application's temp directory, ala java.io.tmpdir.
1184 #ifdef __APPLE__
1185 // macosx has a secure per-user temporary directory
1186 char temp_path_storage[PATH_MAX];
1187 const char* os::get_temp_directory() {
1188 static char *temp_path = NULL;
1189 if (temp_path == NULL) {
1190 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1191 if (pathSize == 0 || pathSize > PATH_MAX) {
1192 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1193 }
1194 temp_path = temp_path_storage;
1195 }
1196 return temp_path;
1197 }
1198 #else // __APPLE__
1199 const char* os::get_temp_directory() { return "/tmp"; }
1200 #endif // __APPLE__
1201
1202 // check if addr is inside libjvm.so
1203 bool os::address_is_in_vm(address addr) {
1204 static address libjvm_base_addr;
1205 Dl_info dlinfo;
1206
1207 if (libjvm_base_addr == NULL) {
1208 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1209 libjvm_base_addr = (address)dlinfo.dli_fbase;
1210 }
1211 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1212 }
1213
1214 if (dladdr((void *)addr, &dlinfo) != 0) {
1215 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1216 }
1217
1218 return false;
1219 }
1220
1221
1222 #define MACH_MAXSYMLEN 256
1223
1224 bool os::dll_address_to_function_name(address addr, char *buf,
1225 int buflen, int *offset,
1226 bool demangle) {
1227 // buf is not optional, but offset is optional
1228 assert(buf != NULL, "sanity check");
1229
1230 Dl_info dlinfo;
1231 char localbuf[MACH_MAXSYMLEN];
1232
1233 if (dladdr((void*)addr, &dlinfo) != 0) {
1234 // see if we have a matching symbol
1235 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1236 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1237 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1238 }
1239 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1240 return true;
1241 }
1242 // no matching symbol so try for just file info
1243 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1244 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1245 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1246 return true;
1247 }
1248 }
1249
1250 // Handle non-dynamic manually:
1251 if (dlinfo.dli_fbase != NULL &&
1252 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1253 dlinfo.dli_fbase)) {
1254 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1255 jio_snprintf(buf, buflen, "%s", localbuf);
1256 }
1257 return true;
1258 }
1259 }
1260 buf[0] = '\0';
1261 if (offset != NULL) *offset = -1;
1262 return false;
1263 }
1264
1265 // ported from solaris version
1266 bool os::dll_address_to_library_name(address addr, char* buf,
1267 int buflen, int* offset) {
1268 // buf is not optional, but offset is optional
1269 assert(buf != NULL, "sanity check");
1270
1271 Dl_info dlinfo;
1272
1273 if (dladdr((void*)addr, &dlinfo) != 0) {
1274 if (dlinfo.dli_fname != NULL) {
1275 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1276 }
1277 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1278 *offset = addr - (address)dlinfo.dli_fbase;
1279 }
1280 return true;
1281 }
1282
1283 buf[0] = '\0';
1284 if (offset) *offset = -1;
1285 return false;
1286 }
1287
1288 // Loads .dll/.so and
1289 // in case of error it checks if .dll/.so was built for the
1290 // same architecture as Hotspot is running on
1291
1292 #ifdef __APPLE__
1293 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1294 #ifdef STATIC_BUILD
1295 return os::get_default_process_handle();
1296 #else
1297 void * result= ::dlopen(filename, RTLD_LAZY);
1298 if (result != NULL) {
1299 // Successful loading
1300 return result;
1301 }
1302
1303 // Read system error message into ebuf
1304 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1305 ebuf[ebuflen-1]='\0';
1306
1307 return NULL;
1308 #endif // STATIC_BUILD
1309 }
1310 #else
1311 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1312 #ifdef STATIC_BUILD
1313 return os::get_default_process_handle();
1314 #else
1315 void * result= ::dlopen(filename, RTLD_LAZY);
1316 if (result != NULL) {
1317 // Successful loading
1318 return result;
1319 }
1320
1321 Elf32_Ehdr elf_head;
1322
1323 // Read system error message into ebuf
1324 // It may or may not be overwritten below
1325 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1326 ebuf[ebuflen-1]='\0';
1327 int diag_msg_max_length=ebuflen-strlen(ebuf);
1328 char* diag_msg_buf=ebuf+strlen(ebuf);
1329
1330 if (diag_msg_max_length==0) {
1331 // No more space in ebuf for additional diagnostics message
1332 return NULL;
1333 }
1334
1335
1336 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1337
1338 if (file_descriptor < 0) {
1339 // Can't open library, report dlerror() message
1340 return NULL;
1341 }
1342
1343 bool failed_to_read_elf_head=
1344 (sizeof(elf_head)!=
1345 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1346
1347 ::close(file_descriptor);
1348 if (failed_to_read_elf_head) {
1349 // file i/o error - report dlerror() msg
1350 return NULL;
1351 }
1352
1353 typedef struct {
1354 Elf32_Half code; // Actual value as defined in elf.h
1355 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1356 char elf_class; // 32 or 64 bit
1357 char endianess; // MSB or LSB
1358 char* name; // String representation
1359 } arch_t;
1360
1361 #ifndef EM_486
1362 #define EM_486 6 /* Intel 80486 */
1363 #endif
1364
1365 #ifndef EM_MIPS_RS3_LE
1366 #define EM_MIPS_RS3_LE 10 /* MIPS */
1367 #endif
1368
1369 #ifndef EM_PPC64
1370 #define EM_PPC64 21 /* PowerPC64 */
1371 #endif
1372
1373 #ifndef EM_S390
1374 #define EM_S390 22 /* IBM System/390 */
1375 #endif
1376
1377 #ifndef EM_IA_64
1378 #define EM_IA_64 50 /* HP/Intel IA-64 */
1379 #endif
1380
1381 #ifndef EM_X86_64
1382 #define EM_X86_64 62 /* AMD x86-64 */
1383 #endif
1384
1385 static const arch_t arch_array[]={
1386 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1387 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1388 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1389 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1390 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1391 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1392 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1393 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1394 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1395 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1396 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1397 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1398 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1399 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1400 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1401 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1402 };
1403
1404 #if (defined IA32)
1405 static Elf32_Half running_arch_code=EM_386;
1406 #elif (defined AMD64)
1407 static Elf32_Half running_arch_code=EM_X86_64;
1408 #elif (defined IA64)
1409 static Elf32_Half running_arch_code=EM_IA_64;
1410 #elif (defined __sparc) && (defined _LP64)
1411 static Elf32_Half running_arch_code=EM_SPARCV9;
1412 #elif (defined __sparc) && (!defined _LP64)
1413 static Elf32_Half running_arch_code=EM_SPARC;
1414 #elif (defined __powerpc64__)
1415 static Elf32_Half running_arch_code=EM_PPC64;
1416 #elif (defined __powerpc__)
1417 static Elf32_Half running_arch_code=EM_PPC;
1418 #elif (defined ARM)
1419 static Elf32_Half running_arch_code=EM_ARM;
1420 #elif (defined S390)
1421 static Elf32_Half running_arch_code=EM_S390;
1422 #elif (defined ALPHA)
1423 static Elf32_Half running_arch_code=EM_ALPHA;
1424 #elif (defined MIPSEL)
1425 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1426 #elif (defined PARISC)
1427 static Elf32_Half running_arch_code=EM_PARISC;
1428 #elif (defined MIPS)
1429 static Elf32_Half running_arch_code=EM_MIPS;
1430 #elif (defined M68K)
1431 static Elf32_Half running_arch_code=EM_68K;
1432 #else
1433 #error Method os::dll_load requires that one of following is defined:\
1434 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1435 #endif
1436
1437 // Identify compatability class for VM's architecture and library's architecture
1438 // Obtain string descriptions for architectures
1439
1440 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1441 int running_arch_index=-1;
1442
1443 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1444 if (running_arch_code == arch_array[i].code) {
1445 running_arch_index = i;
1446 }
1447 if (lib_arch.code == arch_array[i].code) {
1448 lib_arch.compat_class = arch_array[i].compat_class;
1449 lib_arch.name = arch_array[i].name;
1450 }
1451 }
1452
1453 assert(running_arch_index != -1,
1454 "Didn't find running architecture code (running_arch_code) in arch_array");
1455 if (running_arch_index == -1) {
1456 // Even though running architecture detection failed
1457 // we may still continue with reporting dlerror() message
1458 return NULL;
1459 }
1460
1461 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1462 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1463 return NULL;
1464 }
1465
1466 #ifndef S390
1467 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1468 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1469 return NULL;
1470 }
1471 #endif // !S390
1472
1473 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1474 if (lib_arch.name!=NULL) {
1475 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1476 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1477 lib_arch.name, arch_array[running_arch_index].name);
1478 } else {
1479 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1480 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1481 lib_arch.code,
1482 arch_array[running_arch_index].name);
1483 }
1484 }
1485
1486 return NULL;
1487 #endif // STATIC_BUILD
1488 }
1489 #endif // !__APPLE__
1490
1491 void* os::get_default_process_handle() {
1492 #ifdef __APPLE__
1493 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1494 // to avoid finding unexpected symbols on second (or later)
1495 // loads of a library.
1496 return (void*)::dlopen(NULL, RTLD_FIRST);
1497 #else
1498 return (void*)::dlopen(NULL, RTLD_LAZY);
1499 #endif
1500 }
1501
1502 // XXX: Do we need a lock around this as per Linux?
1503 void* os::dll_lookup(void* handle, const char* name) {
1504 return dlsym(handle, name);
1505 }
1506
1507 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1508 outputStream * out = (outputStream *) param;
1509 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1510 return 0;
1511 }
1512
1513 void os::print_dll_info(outputStream *st) {
1514 st->print_cr("Dynamic libraries:");
1515 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1516 st->print_cr("Error: Cannot print dynamic libraries.");
1517 }
1518 }
1519
1520 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1521 #ifdef RTLD_DI_LINKMAP
1522 Dl_info dli;
1523 void *handle;
1524 Link_map *map;
1525 Link_map *p;
1526
1527 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1528 dli.dli_fname == NULL) {
1529 return 1;
1530 }
1531 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1532 if (handle == NULL) {
1533 return 1;
1534 }
1535 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1536 if (map == NULL) {
1537 dlclose(handle);
1538 return 1;
1539 }
1540
1541 while (map->l_prev != NULL)
1542 map = map->l_prev;
1543
1544 while (map != NULL) {
1545 // Value for top_address is returned as 0 since we don't have any information about module size
1546 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1547 dlclose(handle);
1548 return 1;
1549 }
1550 map = map->l_next;
1551 }
1552
1553 dlclose(handle);
1554 #elif defined(__APPLE__)
1555 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1556 // Value for top_address is returned as 0 since we don't have any information about module size
1557 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1558 return 1;
1559 }
1560 }
1561 return 0;
1562 #else
1563 return 1;
1564 #endif
1565 }
1566
1567 void os::get_summary_os_info(char* buf, size_t buflen) {
1568 // These buffers are small because we want this to be brief
1569 // and not use a lot of stack while generating the hs_err file.
1570 char os[100];
1571 size_t size = sizeof(os);
1572 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1573 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1574 #ifdef __APPLE__
1575 strncpy(os, "Darwin", sizeof(os));
1576 #elif __OpenBSD__
1577 strncpy(os, "OpenBSD", sizeof(os));
1578 #else
1579 strncpy(os, "BSD", sizeof(os));
1580 #endif
1581 }
1582
1583 char release[100];
1584 size = sizeof(release);
1585 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1586 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1587 // if error, leave blank
1588 strncpy(release, "", sizeof(release));
1589 }
1590 snprintf(buf, buflen, "%s %s", os, release);
1591 }
1592
1593 void os::print_os_info_brief(outputStream* st) {
1594 os::Posix::print_uname_info(st);
1595 }
1596
1597 void os::print_os_info(outputStream* st) {
1598 st->print("OS:");
1599
1600 os::Posix::print_uname_info(st);
1601
1602 os::Posix::print_rlimit_info(st);
1603
1604 os::Posix::print_load_average(st);
1605 }
1606
1607 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1608 // Nothing to do for now.
1609 }
1610
1611 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1612 unsigned int mhz;
1613 size_t size = sizeof(mhz);
1614 int mib[] = { CTL_HW, HW_CPU_FREQ };
1615 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1616 mhz = 1; // looks like an error but can be divided by
1617 } else {
1618 mhz /= 1000000; // reported in millions
1619 }
1620
1621 char model[100];
1622 size = sizeof(model);
1623 int mib_model[] = { CTL_HW, HW_MODEL };
1624 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1625 strncpy(model, cpu_arch, sizeof(model));
1626 }
1627
1628 char machine[100];
1629 size = sizeof(machine);
1630 int mib_machine[] = { CTL_HW, HW_MACHINE };
1631 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1632 strncpy(machine, "", sizeof(machine));
1633 }
1634
1635 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1636 }
1637
1638 void os::print_memory_info(outputStream* st) {
1639
1640 st->print("Memory:");
1641 st->print(" %dk page", os::vm_page_size()>>10);
1642
1643 st->print(", physical " UINT64_FORMAT "k",
1644 os::physical_memory() >> 10);
1645 st->print("(" UINT64_FORMAT "k free)",
1646 os::available_memory() >> 10);
1647 st->cr();
1648 }
1649
1650 static void print_signal_handler(outputStream* st, int sig,
1651 char* buf, size_t buflen);
1652
1653 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1654 st->print_cr("Signal Handlers:");
1655 print_signal_handler(st, SIGSEGV, buf, buflen);
1656 print_signal_handler(st, SIGBUS , buf, buflen);
1657 print_signal_handler(st, SIGFPE , buf, buflen);
1658 print_signal_handler(st, SIGPIPE, buf, buflen);
1659 print_signal_handler(st, SIGXFSZ, buf, buflen);
1660 print_signal_handler(st, SIGILL , buf, buflen);
1661 print_signal_handler(st, SR_signum, buf, buflen);
1662 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1663 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1664 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1665 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1666 }
1667
1668 static char saved_jvm_path[MAXPATHLEN] = {0};
1669
1670 // Find the full path to the current module, libjvm
1671 void os::jvm_path(char *buf, jint buflen) {
1672 // Error checking.
1673 if (buflen < MAXPATHLEN) {
1674 assert(false, "must use a large-enough buffer");
1675 buf[0] = '\0';
1676 return;
1677 }
1678 // Lazy resolve the path to current module.
1679 if (saved_jvm_path[0] != 0) {
1680 strcpy(buf, saved_jvm_path);
1681 return;
1682 }
1683
1684 char dli_fname[MAXPATHLEN];
1685 bool ret = dll_address_to_library_name(
1686 CAST_FROM_FN_PTR(address, os::jvm_path),
1687 dli_fname, sizeof(dli_fname), NULL);
1688 assert(ret, "cannot locate libjvm");
1689 char *rp = NULL;
1690 if (ret && dli_fname[0] != '\0') {
1691 rp = os::Posix::realpath(dli_fname, buf, buflen);
1692 }
1693 if (rp == NULL) {
1694 return;
1695 }
1696
1697 if (Arguments::sun_java_launcher_is_altjvm()) {
1698 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1699 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1700 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1701 // appears at the right place in the string, then assume we are
1702 // installed in a JDK and we're done. Otherwise, check for a
1703 // JAVA_HOME environment variable and construct a path to the JVM
1704 // being overridden.
1705
1706 const char *p = buf + strlen(buf) - 1;
1707 for (int count = 0; p > buf && count < 5; ++count) {
1708 for (--p; p > buf && *p != '/'; --p)
1709 /* empty */ ;
1710 }
1711
1712 if (strncmp(p, "/jre/lib/", 9) != 0) {
1713 // Look for JAVA_HOME in the environment.
1714 char* java_home_var = ::getenv("JAVA_HOME");
1715 if (java_home_var != NULL && java_home_var[0] != 0) {
1716 char* jrelib_p;
1717 int len;
1718
1719 // Check the current module name "libjvm"
1720 p = strrchr(buf, '/');
1721 assert(strstr(p, "/libjvm") == p, "invalid library name");
1722
1723 rp = os::Posix::realpath(java_home_var, buf, buflen);
1724 if (rp == NULL) {
1725 return;
1726 }
1727
1728 // determine if this is a legacy image or modules image
1729 // modules image doesn't have "jre" subdirectory
1730 len = strlen(buf);
1731 assert(len < buflen, "Ran out of buffer space");
1732 jrelib_p = buf + len;
1733
1734 // Add the appropriate library subdir
1735 snprintf(jrelib_p, buflen-len, "/jre/lib");
1736 if (0 != access(buf, F_OK)) {
1737 snprintf(jrelib_p, buflen-len, "/lib");
1738 }
1739
1740 // Add the appropriate client or server subdir
1741 len = strlen(buf);
1742 jrelib_p = buf + len;
1743 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1744 if (0 != access(buf, F_OK)) {
1745 snprintf(jrelib_p, buflen-len, "%s", "");
1746 }
1747
1748 // If the path exists within JAVA_HOME, add the JVM library name
1749 // to complete the path to JVM being overridden. Otherwise fallback
1750 // to the path to the current library.
1751 if (0 == access(buf, F_OK)) {
1752 // Use current module name "libjvm"
1753 len = strlen(buf);
1754 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1755 } else {
1756 // Fall back to path of current library
1757 rp = os::Posix::realpath(dli_fname, buf, buflen);
1758 if (rp == NULL) {
1759 return;
1760 }
1761 }
1762 }
1763 }
1764 }
1765
1766 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1767 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1768 }
1769
1770 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1771 // no prefix required, not even "_"
1772 }
1773
1774 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1775 // no suffix required
1776 }
1777
1778 ////////////////////////////////////////////////////////////////////////////////
1779 // sun.misc.Signal support
1780
1781 static volatile jint sigint_count = 0;
1782
1783 static void UserHandler(int sig, void *siginfo, void *context) {
1784 // 4511530 - sem_post is serialized and handled by the manager thread. When
1785 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1786 // don't want to flood the manager thread with sem_post requests.
1787 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1788 return;
1789 }
1790
1791 // Ctrl-C is pressed during error reporting, likely because the error
1792 // handler fails to abort. Let VM die immediately.
1793 if (sig == SIGINT && VMError::is_error_reported()) {
1794 os::die();
1795 }
1796
1797 os::signal_notify(sig);
1798 }
1799
1800 void* os::user_handler() {
1801 return CAST_FROM_FN_PTR(void*, UserHandler);
1802 }
1803
1804 extern "C" {
1805 typedef void (*sa_handler_t)(int);
1806 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1807 }
1808
1809 void* os::signal(int signal_number, void* handler) {
1810 struct sigaction sigAct, oldSigAct;
1811
1812 sigfillset(&(sigAct.sa_mask));
1813 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1814 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1815
1816 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1817 // -1 means registration failed
1818 return (void *)-1;
1819 }
1820
1821 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1822 }
1823
1824 void os::signal_raise(int signal_number) {
1825 ::raise(signal_number);
1826 }
1827
1828 // The following code is moved from os.cpp for making this
1829 // code platform specific, which it is by its very nature.
1830
1831 // Will be modified when max signal is changed to be dynamic
1832 int os::sigexitnum_pd() {
1833 return NSIG;
1834 }
1835
1836 // a counter for each possible signal value
1837 static volatile jint pending_signals[NSIG+1] = { 0 };
1838
1839 // Bsd(POSIX) specific hand shaking semaphore.
1840 #ifdef __APPLE__
1841 typedef semaphore_t os_semaphore_t;
1842
1843 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1844 #define SEM_WAIT(sem) semaphore_wait(sem)
1845 #define SEM_POST(sem) semaphore_signal(sem)
1846 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1847 #else
1848 typedef sem_t os_semaphore_t;
1849
1850 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1851 #define SEM_WAIT(sem) sem_wait(&sem)
1852 #define SEM_POST(sem) sem_post(&sem)
1853 #define SEM_DESTROY(sem) sem_destroy(&sem)
1854 #endif
1855
1856 #ifdef __APPLE__
1857 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
1858
1859 static const char* sem_init_strerror(kern_return_t value) {
1860 switch (value) {
1861 case KERN_INVALID_ARGUMENT: return "Invalid argument";
1862 case KERN_RESOURCE_SHORTAGE: return "Resource shortage";
1863 default: return "Unknown";
1864 }
1865 }
1866
1867 OSXSemaphore::OSXSemaphore(uint value) {
1868 kern_return_t ret = SEM_INIT(_semaphore, value);
1869
1870 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret));
1871 }
1872
1873 OSXSemaphore::~OSXSemaphore() {
1874 SEM_DESTROY(_semaphore);
1875 }
1876
1877 void OSXSemaphore::signal(uint count) {
1878 for (uint i = 0; i < count; i++) {
1879 kern_return_t ret = SEM_POST(_semaphore);
1880
1881 assert(ret == KERN_SUCCESS, "Failed to signal semaphore");
1882 }
1883 }
1884
1885 void OSXSemaphore::wait() {
1886 kern_return_t ret;
1887 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) {
1888 // Semaphore was interrupted. Retry.
1889 }
1890 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore");
1891 }
1892
1893 jlong OSXSemaphore::currenttime() {
1894 struct timeval tv;
1895 gettimeofday(&tv, NULL);
1896 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1897 }
1898
1899 bool OSXSemaphore::trywait() {
1900 return timedwait(0, 0);
1901 }
1902
1903 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) {
1904 kern_return_t kr = KERN_ABORTED;
1905 mach_timespec_t waitspec;
1906 waitspec.tv_sec = sec;
1907 waitspec.tv_nsec = nsec;
1908
1909 jlong starttime = currenttime();
1910
1911 kr = semaphore_timedwait(_semaphore, waitspec);
1912 while (kr == KERN_ABORTED) {
1913 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1914
1915 jlong current = currenttime();
1916 jlong passedtime = current - starttime;
1917
1918 if (passedtime >= totalwait) {
1919 waitspec.tv_sec = 0;
1920 waitspec.tv_nsec = 0;
1921 } else {
1922 jlong waittime = totalwait - (current - starttime);
1923 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
1924 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
1925 }
1926
1927 kr = semaphore_timedwait(_semaphore, waitspec);
1928 }
1929
1930 return kr == KERN_SUCCESS;
1931 }
1932
1933 #else
1934 // Use POSIX implementation of semaphores.
1935
1936 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
1937 struct timespec ts;
1938 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
1939
1940 return ts;
1941 }
1942
1943 #endif // __APPLE__
1944
1945 static os_semaphore_t sig_sem;
1946
1947 #ifdef __APPLE__
1948 static OSXSemaphore sr_semaphore;
1949 #else
1950 static PosixSemaphore sr_semaphore;
1951 #endif
1952
1953 void os::signal_init_pd() {
1954 // Initialize signal structures
1955 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1956
1957 // Initialize signal semaphore
1958 ::SEM_INIT(sig_sem, 0);
1959 }
1960
1961 void os::signal_notify(int sig) {
1962 Atomic::inc(&pending_signals[sig]);
1963 ::SEM_POST(sig_sem);
1964 }
1965
1966 static int check_pending_signals(bool wait) {
1967 Atomic::store(0, &sigint_count);
1968 for (;;) {
1969 for (int i = 0; i < NSIG + 1; i++) {
1970 jint n = pending_signals[i];
1971 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1972 return i;
1973 }
1974 }
1975 if (!wait) {
1976 return -1;
1977 }
1978 JavaThread *thread = JavaThread::current();
1979 ThreadBlockInVM tbivm(thread);
1980
1981 bool threadIsSuspended;
1982 do {
1983 thread->set_suspend_equivalent();
1984 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1985 ::SEM_WAIT(sig_sem);
1986
1987 // were we externally suspended while we were waiting?
1988 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1989 if (threadIsSuspended) {
1990 // The semaphore has been incremented, but while we were waiting
1991 // another thread suspended us. We don't want to continue running
1992 // while suspended because that would surprise the thread that
1993 // suspended us.
1994 ::SEM_POST(sig_sem);
1995
1996 thread->java_suspend_self();
1997 }
1998 } while (threadIsSuspended);
1999 }
2000 }
2001
2002 int os::signal_lookup() {
2003 return check_pending_signals(false);
2004 }
2005
2006 int os::signal_wait() {
2007 return check_pending_signals(true);
2008 }
2009
2010 ////////////////////////////////////////////////////////////////////////////////
2011 // Virtual Memory
2012
2013 int os::vm_page_size() {
2014 // Seems redundant as all get out
2015 assert(os::Bsd::page_size() != -1, "must call os::init");
2016 return os::Bsd::page_size();
2017 }
2018
2019 // Solaris allocates memory by pages.
2020 int os::vm_allocation_granularity() {
2021 assert(os::Bsd::page_size() != -1, "must call os::init");
2022 return os::Bsd::page_size();
2023 }
2024
2025 // Rationale behind this function:
2026 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2027 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2028 // samples for JITted code. Here we create private executable mapping over the code cache
2029 // and then we can use standard (well, almost, as mapping can change) way to provide
2030 // info for the reporting script by storing timestamp and location of symbol
2031 void bsd_wrap_code(char* base, size_t size) {
2032 static volatile jint cnt = 0;
2033
2034 if (!UseOprofile) {
2035 return;
2036 }
2037
2038 char buf[PATH_MAX + 1];
2039 int num = Atomic::add(1, &cnt);
2040
2041 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2042 os::get_temp_directory(), os::current_process_id(), num);
2043 unlink(buf);
2044
2045 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2046
2047 if (fd != -1) {
2048 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2049 if (rv != (off_t)-1) {
2050 if (::write(fd, "", 1) == 1) {
2051 mmap(base, size,
2052 PROT_READ|PROT_WRITE|PROT_EXEC,
2053 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2054 }
2055 }
2056 ::close(fd);
2057 unlink(buf);
2058 }
2059 }
2060
2061 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2062 int err) {
2063 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
2064 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
2065 os::errno_name(err), err);
2066 }
2067
2068 // NOTE: Bsd kernel does not really reserve the pages for us.
2069 // All it does is to check if there are enough free pages
2070 // left at the time of mmap(). This could be a potential
2071 // problem.
2072 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2073 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2074 #ifdef __OpenBSD__
2075 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2076 if (::mprotect(addr, size, prot) == 0) {
2077 return true;
2078 }
2079 #else
2080 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2081 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2082 if (res != (uintptr_t) MAP_FAILED) {
2083 return true;
2084 }
2085 #endif
2086
2087 // Warn about any commit errors we see in non-product builds just
2088 // in case mmap() doesn't work as described on the man page.
2089 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2090
2091 return false;
2092 }
2093
2094 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2095 bool exec) {
2096 // alignment_hint is ignored on this OS
2097 return pd_commit_memory(addr, size, exec);
2098 }
2099
2100 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2101 const char* mesg) {
2102 assert(mesg != NULL, "mesg must be specified");
2103 if (!pd_commit_memory(addr, size, exec)) {
2104 // add extra info in product mode for vm_exit_out_of_memory():
2105 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2106 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2107 }
2108 }
2109
2110 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2111 size_t alignment_hint, bool exec,
2112 const char* mesg) {
2113 // alignment_hint is ignored on this OS
2114 pd_commit_memory_or_exit(addr, size, exec, mesg);
2115 }
2116
2117 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2118 }
2119
2120 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2121 ::madvise(addr, bytes, MADV_DONTNEED);
2122 }
2123
2124 void os::numa_make_global(char *addr, size_t bytes) {
2125 }
2126
2127 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2128 }
2129
2130 bool os::numa_topology_changed() { return false; }
2131
2132 size_t os::numa_get_groups_num() {
2133 return 1;
2134 }
2135
2136 int os::numa_get_group_id() {
2137 return 0;
2138 }
2139
2140 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2141 if (size > 0) {
2142 ids[0] = 0;
2143 return 1;
2144 }
2145 return 0;
2146 }
2147
2148 bool os::get_page_info(char *start, page_info* info) {
2149 return false;
2150 }
2151
2152 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2153 return end;
2154 }
2155
2156
2157 bool os::pd_uncommit_memory(char* addr, size_t size) {
2158 #ifdef __OpenBSD__
2159 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2160 return ::mprotect(addr, size, PROT_NONE) == 0;
2161 #else
2162 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2163 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2164 return res != (uintptr_t) MAP_FAILED;
2165 #endif
2166 }
2167
2168 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2169 return os::commit_memory(addr, size, !ExecMem);
2170 }
2171
2172 // If this is a growable mapping, remove the guard pages entirely by
2173 // munmap()ping them. If not, just call uncommit_memory().
2174 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2175 return os::uncommit_memory(addr, size);
2176 }
2177
2178 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2179 // at 'requested_addr'. If there are existing memory mappings at the same
2180 // location, however, they will be overwritten. If 'fixed' is false,
2181 // 'requested_addr' is only treated as a hint, the return value may or
2182 // may not start from the requested address. Unlike Bsd mmap(), this
2183 // function returns NULL to indicate failure.
2184 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2185 char * addr;
2186 int flags;
2187
2188 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2189 if (fixed) {
2190 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2191 flags |= MAP_FIXED;
2192 }
2193
2194 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2195 // touch an uncommitted page. Otherwise, the read/write might
2196 // succeed if we have enough swap space to back the physical page.
2197 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2198 flags, -1, 0);
2199
2200 return addr == MAP_FAILED ? NULL : addr;
2201 }
2202
2203 static int anon_munmap(char * addr, size_t size) {
2204 return ::munmap(addr, size) == 0;
2205 }
2206
2207 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2208 size_t alignment_hint) {
2209 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2210 }
2211
2212 bool os::pd_release_memory(char* addr, size_t size) {
2213 return anon_munmap(addr, size);
2214 }
2215
2216 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2217 // Bsd wants the mprotect address argument to be page aligned.
2218 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2219
2220 // According to SUSv3, mprotect() should only be used with mappings
2221 // established by mmap(), and mmap() always maps whole pages. Unaligned
2222 // 'addr' likely indicates problem in the VM (e.g. trying to change
2223 // protection of malloc'ed or statically allocated memory). Check the
2224 // caller if you hit this assert.
2225 assert(addr == bottom, "sanity check");
2226
2227 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2228 return ::mprotect(bottom, size, prot) == 0;
2229 }
2230
2231 // Set protections specified
2232 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2233 bool is_committed) {
2234 unsigned int p = 0;
2235 switch (prot) {
2236 case MEM_PROT_NONE: p = PROT_NONE; break;
2237 case MEM_PROT_READ: p = PROT_READ; break;
2238 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2239 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2240 default:
2241 ShouldNotReachHere();
2242 }
2243 // is_committed is unused.
2244 return bsd_mprotect(addr, bytes, p);
2245 }
2246
2247 bool os::guard_memory(char* addr, size_t size) {
2248 return bsd_mprotect(addr, size, PROT_NONE);
2249 }
2250
2251 bool os::unguard_memory(char* addr, size_t size) {
2252 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2253 }
2254
2255 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2256 return false;
2257 }
2258
2259 // Large page support
2260
2261 static size_t _large_page_size = 0;
2262
2263 void os::large_page_init() {
2264 }
2265
2266
2267 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2268 fatal("This code is not used or maintained.");
2269
2270 // "exec" is passed in but not used. Creating the shared image for
2271 // the code cache doesn't have an SHM_X executable permission to check.
2272 assert(UseLargePages && UseSHM, "only for SHM large pages");
2273
2274 key_t key = IPC_PRIVATE;
2275 char *addr;
2276
2277 bool warn_on_failure = UseLargePages &&
2278 (!FLAG_IS_DEFAULT(UseLargePages) ||
2279 !FLAG_IS_DEFAULT(LargePageSizeInBytes));
2280
2281 // Create a large shared memory region to attach to based on size.
2282 // Currently, size is the total size of the heap
2283 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2284 if (shmid == -1) {
2285 // Possible reasons for shmget failure:
2286 // 1. shmmax is too small for Java heap.
2287 // > check shmmax value: cat /proc/sys/kernel/shmmax
2288 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2289 // 2. not enough large page memory.
2290 // > check available large pages: cat /proc/meminfo
2291 // > increase amount of large pages:
2292 // echo new_value > /proc/sys/vm/nr_hugepages
2293 // Note 1: different Bsd may use different name for this property,
2294 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2295 // Note 2: it's possible there's enough physical memory available but
2296 // they are so fragmented after a long run that they can't
2297 // coalesce into large pages. Try to reserve large pages when
2298 // the system is still "fresh".
2299 if (warn_on_failure) {
2300 warning("Failed to reserve shared memory (errno = %d).", errno);
2301 }
2302 return NULL;
2303 }
2304
2305 // attach to the region
2306 addr = (char*)shmat(shmid, req_addr, 0);
2307 int err = errno;
2308
2309 // Remove shmid. If shmat() is successful, the actual shared memory segment
2310 // will be deleted when it's detached by shmdt() or when the process
2311 // terminates. If shmat() is not successful this will remove the shared
2312 // segment immediately.
2313 shmctl(shmid, IPC_RMID, NULL);
2314
2315 if ((intptr_t)addr == -1) {
2316 if (warn_on_failure) {
2317 warning("Failed to attach shared memory (errno = %d).", err);
2318 }
2319 return NULL;
2320 }
2321
2322 // The memory is committed
2323 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
2324
2325 return addr;
2326 }
2327
2328 bool os::release_memory_special(char* base, size_t bytes) {
2329 if (MemTracker::tracking_level() > NMT_minimal) {
2330 Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
2331 // detaching the SHM segment will also delete it, see reserve_memory_special()
2332 int rslt = shmdt(base);
2333 if (rslt == 0) {
2334 tkr.record((address)base, bytes);
2335 return true;
2336 } else {
2337 return false;
2338 }
2339 } else {
2340 return shmdt(base) == 0;
2341 }
2342 }
2343
2344 size_t os::large_page_size() {
2345 return _large_page_size;
2346 }
2347
2348 // HugeTLBFS allows application to commit large page memory on demand;
2349 // with SysV SHM the entire memory region must be allocated as shared
2350 // memory.
2351 bool os::can_commit_large_page_memory() {
2352 return UseHugeTLBFS;
2353 }
2354
2355 bool os::can_execute_large_page_memory() {
2356 return UseHugeTLBFS;
2357 }
2358
2359 // Reserve memory at an arbitrary address, only if that area is
2360 // available (and not reserved for something else).
2361
2362 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2363 const int max_tries = 10;
2364 char* base[max_tries];
2365 size_t size[max_tries];
2366 const size_t gap = 0x000000;
2367
2368 // Assert only that the size is a multiple of the page size, since
2369 // that's all that mmap requires, and since that's all we really know
2370 // about at this low abstraction level. If we need higher alignment,
2371 // we can either pass an alignment to this method or verify alignment
2372 // in one of the methods further up the call chain. See bug 5044738.
2373 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2374
2375 // Repeatedly allocate blocks until the block is allocated at the
2376 // right spot.
2377
2378 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2379 // if kernel honors the hint then we can return immediately.
2380 char * addr = anon_mmap(requested_addr, bytes, false);
2381 if (addr == requested_addr) {
2382 return requested_addr;
2383 }
2384
2385 if (addr != NULL) {
2386 // mmap() is successful but it fails to reserve at the requested address
2387 anon_munmap(addr, bytes);
2388 }
2389
2390 int i;
2391 for (i = 0; i < max_tries; ++i) {
2392 base[i] = reserve_memory(bytes);
2393
2394 if (base[i] != NULL) {
2395 // Is this the block we wanted?
2396 if (base[i] == requested_addr) {
2397 size[i] = bytes;
2398 break;
2399 }
2400
2401 // Does this overlap the block we wanted? Give back the overlapped
2402 // parts and try again.
2403
2404 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2405 if (top_overlap >= 0 && top_overlap < bytes) {
2406 unmap_memory(base[i], top_overlap);
2407 base[i] += top_overlap;
2408 size[i] = bytes - top_overlap;
2409 } else {
2410 size_t bottom_overlap = base[i] + bytes - requested_addr;
2411 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2412 unmap_memory(requested_addr, bottom_overlap);
2413 size[i] = bytes - bottom_overlap;
2414 } else {
2415 size[i] = bytes;
2416 }
2417 }
2418 }
2419 }
2420
2421 // Give back the unused reserved pieces.
2422
2423 for (int j = 0; j < i; ++j) {
2424 if (base[j] != NULL) {
2425 unmap_memory(base[j], size[j]);
2426 }
2427 }
2428
2429 if (i < max_tries) {
2430 return requested_addr;
2431 } else {
2432 return NULL;
2433 }
2434 }
2435
2436 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2437 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2438 }
2439
2440 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2441 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2442 }
2443
2444 void os::naked_short_sleep(jlong ms) {
2445 struct timespec req;
2446
2447 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2448 req.tv_sec = 0;
2449 if (ms > 0) {
2450 req.tv_nsec = (ms % 1000) * 1000000;
2451 } else {
2452 req.tv_nsec = 1;
2453 }
2454
2455 nanosleep(&req, NULL);
2456
2457 return;
2458 }
2459
2460 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2461 void os::infinite_sleep() {
2462 while (true) { // sleep forever ...
2463 ::sleep(100); // ... 100 seconds at a time
2464 }
2465 }
2466
2467 // Used to convert frequent JVM_Yield() to nops
2468 bool os::dont_yield() {
2469 return DontYieldALot;
2470 }
2471
2472 void os::naked_yield() {
2473 sched_yield();
2474 }
2475
2476 ////////////////////////////////////////////////////////////////////////////////
2477 // thread priority support
2478
2479 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2480 // only supports dynamic priority, static priority must be zero. For real-time
2481 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2482 // However, for large multi-threaded applications, SCHED_RR is not only slower
2483 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2484 // of 5 runs - Sep 2005).
2485 //
2486 // The following code actually changes the niceness of kernel-thread/LWP. It
2487 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2488 // not the entire user process, and user level threads are 1:1 mapped to kernel
2489 // threads. It has always been the case, but could change in the future. For
2490 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2491 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2492
2493 #if !defined(__APPLE__)
2494 int os::java_to_os_priority[CriticalPriority + 1] = {
2495 19, // 0 Entry should never be used
2496
2497 0, // 1 MinPriority
2498 3, // 2
2499 6, // 3
2500
2501 10, // 4
2502 15, // 5 NormPriority
2503 18, // 6
2504
2505 21, // 7
2506 25, // 8
2507 28, // 9 NearMaxPriority
2508
2509 31, // 10 MaxPriority
2510
2511 31 // 11 CriticalPriority
2512 };
2513 #else
2514 // Using Mach high-level priority assignments
2515 int os::java_to_os_priority[CriticalPriority + 1] = {
2516 0, // 0 Entry should never be used (MINPRI_USER)
2517
2518 27, // 1 MinPriority
2519 28, // 2
2520 29, // 3
2521
2522 30, // 4
2523 31, // 5 NormPriority (BASEPRI_DEFAULT)
2524 32, // 6
2525
2526 33, // 7
2527 34, // 8
2528 35, // 9 NearMaxPriority
2529
2530 36, // 10 MaxPriority
2531
2532 36 // 11 CriticalPriority
2533 };
2534 #endif
2535
2536 static int prio_init() {
2537 if (ThreadPriorityPolicy == 1) {
2538 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2539 // if effective uid is not root. Perhaps, a more elegant way of doing
2540 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2541 if (geteuid() != 0) {
2542 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2543 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2544 }
2545 ThreadPriorityPolicy = 0;
2546 }
2547 }
2548 if (UseCriticalJavaThreadPriority) {
2549 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2550 }
2551 return 0;
2552 }
2553
2554 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2555 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2556
2557 #ifdef __OpenBSD__
2558 // OpenBSD pthread_setprio starves low priority threads
2559 return OS_OK;
2560 #elif defined(__FreeBSD__)
2561 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2562 #elif defined(__APPLE__) || defined(__NetBSD__)
2563 struct sched_param sp;
2564 int policy;
2565 pthread_t self = pthread_self();
2566
2567 if (pthread_getschedparam(self, &policy, &sp) != 0) {
2568 return OS_ERR;
2569 }
2570
2571 sp.sched_priority = newpri;
2572 if (pthread_setschedparam(self, policy, &sp) != 0) {
2573 return OS_ERR;
2574 }
2575
2576 return OS_OK;
2577 #else
2578 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2579 return (ret == 0) ? OS_OK : OS_ERR;
2580 #endif
2581 }
2582
2583 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2584 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2585 *priority_ptr = java_to_os_priority[NormPriority];
2586 return OS_OK;
2587 }
2588
2589 errno = 0;
2590 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2591 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2592 #elif defined(__APPLE__) || defined(__NetBSD__)
2593 int policy;
2594 struct sched_param sp;
2595
2596 pthread_getschedparam(pthread_self(), &policy, &sp);
2597 *priority_ptr = sp.sched_priority;
2598 #else
2599 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2600 #endif
2601 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2602 }
2603
2604 // Hint to the underlying OS that a task switch would not be good.
2605 // Void return because it's a hint and can fail.
2606 void os::hint_no_preempt() {}
2607
2608 ////////////////////////////////////////////////////////////////////////////////
2609 // suspend/resume support
2610
2611 // The low-level signal-based suspend/resume support is a remnant from the
2612 // old VM-suspension that used to be for java-suspension, safepoints etc,
2613 // within hotspot. Currently used by JFR's OSThreadSampler
2614 //
2615 // The remaining code is greatly simplified from the more general suspension
2616 // code that used to be used.
2617 //
2618 // The protocol is quite simple:
2619 // - suspend:
2620 // - sends a signal to the target thread
2621 // - polls the suspend state of the osthread using a yield loop
2622 // - target thread signal handler (SR_handler) sets suspend state
2623 // and blocks in sigsuspend until continued
2624 // - resume:
2625 // - sets target osthread state to continue
2626 // - sends signal to end the sigsuspend loop in the SR_handler
2627 //
2628 // Note that the SR_lock plays no role in this suspend/resume protocol,
2629 // but is checked for NULL in SR_handler as a thread termination indicator.
2630 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2631 //
2632 // Note that resume_clear_context() and suspend_save_context() are needed
2633 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2634 // which in part is used by:
2635 // - Forte Analyzer: AsyncGetCallTrace()
2636 // - StackBanging: get_frame_at_stack_banging_point()
2637
2638 static void resume_clear_context(OSThread *osthread) {
2639 osthread->set_ucontext(NULL);
2640 osthread->set_siginfo(NULL);
2641 }
2642
2643 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2644 osthread->set_ucontext(context);
2645 osthread->set_siginfo(siginfo);
2646 }
2647
2648 // Handler function invoked when a thread's execution is suspended or
2649 // resumed. We have to be careful that only async-safe functions are
2650 // called here (Note: most pthread functions are not async safe and
2651 // should be avoided.)
2652 //
2653 // Note: sigwait() is a more natural fit than sigsuspend() from an
2654 // interface point of view, but sigwait() prevents the signal hander
2655 // from being run. libpthread would get very confused by not having
2656 // its signal handlers run and prevents sigwait()'s use with the
2657 // mutex granting granting signal.
2658 //
2659 // Currently only ever called on the VMThread or JavaThread
2660 //
2661 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2662 // Save and restore errno to avoid confusing native code with EINTR
2663 // after sigsuspend.
2664 int old_errno = errno;
2665
2666 Thread* thread = Thread::current_or_null_safe();
2667 assert(thread != NULL, "Missing current thread in SR_handler");
2668
2669 // On some systems we have seen signal delivery get "stuck" until the signal
2670 // mask is changed as part of thread termination. Check that the current thread
2671 // has not already terminated (via SR_lock()) - else the following assertion
2672 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2673 // destructor has completed.
2674
2675 if (thread->SR_lock() == NULL) {
2676 return;
2677 }
2678
2679 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2680
2681 OSThread* osthread = thread->osthread();
2682
2683 os::SuspendResume::State current = osthread->sr.state();
2684 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2685 suspend_save_context(osthread, siginfo, context);
2686
2687 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2688 os::SuspendResume::State state = osthread->sr.suspended();
2689 if (state == os::SuspendResume::SR_SUSPENDED) {
2690 sigset_t suspend_set; // signals for sigsuspend()
2691
2692 // get current set of blocked signals and unblock resume signal
2693 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2694 sigdelset(&suspend_set, SR_signum);
2695
2696 sr_semaphore.signal();
2697 // wait here until we are resumed
2698 while (1) {
2699 sigsuspend(&suspend_set);
2700
2701 os::SuspendResume::State result = osthread->sr.running();
2702 if (result == os::SuspendResume::SR_RUNNING) {
2703 sr_semaphore.signal();
2704 break;
2705 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2706 ShouldNotReachHere();
2707 }
2708 }
2709
2710 } else if (state == os::SuspendResume::SR_RUNNING) {
2711 // request was cancelled, continue
2712 } else {
2713 ShouldNotReachHere();
2714 }
2715
2716 resume_clear_context(osthread);
2717 } else if (current == os::SuspendResume::SR_RUNNING) {
2718 // request was cancelled, continue
2719 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2720 // ignore
2721 } else {
2722 // ignore
2723 }
2724
2725 errno = old_errno;
2726 }
2727
2728
2729 static int SR_initialize() {
2730 struct sigaction act;
2731 char *s;
2732 // Get signal number to use for suspend/resume
2733 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2734 int sig = ::strtol(s, 0, 10);
2735 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2736 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2737 SR_signum = sig;
2738 } else {
2739 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2740 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2741 }
2742 }
2743
2744 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2745 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2746
2747 sigemptyset(&SR_sigset);
2748 sigaddset(&SR_sigset, SR_signum);
2749
2750 // Set up signal handler for suspend/resume
2751 act.sa_flags = SA_RESTART|SA_SIGINFO;
2752 act.sa_handler = (void (*)(int)) SR_handler;
2753
2754 // SR_signum is blocked by default.
2755 // 4528190 - We also need to block pthread restart signal (32 on all
2756 // supported Bsd platforms). Note that BsdThreads need to block
2757 // this signal for all threads to work properly. So we don't have
2758 // to use hard-coded signal number when setting up the mask.
2759 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2760
2761 if (sigaction(SR_signum, &act, 0) == -1) {
2762 return -1;
2763 }
2764
2765 // Save signal flag
2766 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2767 return 0;
2768 }
2769
2770 static int sr_notify(OSThread* osthread) {
2771 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2772 assert_status(status == 0, status, "pthread_kill");
2773 return status;
2774 }
2775
2776 // "Randomly" selected value for how long we want to spin
2777 // before bailing out on suspending a thread, also how often
2778 // we send a signal to a thread we want to resume
2779 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2780 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2781
2782 // returns true on success and false on error - really an error is fatal
2783 // but this seems the normal response to library errors
2784 static bool do_suspend(OSThread* osthread) {
2785 assert(osthread->sr.is_running(), "thread should be running");
2786 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2787
2788 // mark as suspended and send signal
2789 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2790 // failed to switch, state wasn't running?
2791 ShouldNotReachHere();
2792 return false;
2793 }
2794
2795 if (sr_notify(osthread) != 0) {
2796 ShouldNotReachHere();
2797 }
2798
2799 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2800 while (true) {
2801 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2802 break;
2803 } else {
2804 // timeout
2805 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2806 if (cancelled == os::SuspendResume::SR_RUNNING) {
2807 return false;
2808 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2809 // make sure that we consume the signal on the semaphore as well
2810 sr_semaphore.wait();
2811 break;
2812 } else {
2813 ShouldNotReachHere();
2814 return false;
2815 }
2816 }
2817 }
2818
2819 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2820 return true;
2821 }
2822
2823 static void do_resume(OSThread* osthread) {
2824 assert(osthread->sr.is_suspended(), "thread should be suspended");
2825 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2826
2827 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2828 // failed to switch to WAKEUP_REQUEST
2829 ShouldNotReachHere();
2830 return;
2831 }
2832
2833 while (true) {
2834 if (sr_notify(osthread) == 0) {
2835 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2836 if (osthread->sr.is_running()) {
2837 return;
2838 }
2839 }
2840 } else {
2841 ShouldNotReachHere();
2842 }
2843 }
2844
2845 guarantee(osthread->sr.is_running(), "Must be running!");
2846 }
2847
2848 ///////////////////////////////////////////////////////////////////////////////////
2849 // signal handling (except suspend/resume)
2850
2851 // This routine may be used by user applications as a "hook" to catch signals.
2852 // The user-defined signal handler must pass unrecognized signals to this
2853 // routine, and if it returns true (non-zero), then the signal handler must
2854 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2855 // routine will never retun false (zero), but instead will execute a VM panic
2856 // routine kill the process.
2857 //
2858 // If this routine returns false, it is OK to call it again. This allows
2859 // the user-defined signal handler to perform checks either before or after
2860 // the VM performs its own checks. Naturally, the user code would be making
2861 // a serious error if it tried to handle an exception (such as a null check
2862 // or breakpoint) that the VM was generating for its own correct operation.
2863 //
2864 // This routine may recognize any of the following kinds of signals:
2865 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2866 // It should be consulted by handlers for any of those signals.
2867 //
2868 // The caller of this routine must pass in the three arguments supplied
2869 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2870 // field of the structure passed to sigaction(). This routine assumes that
2871 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2872 //
2873 // Note that the VM will print warnings if it detects conflicting signal
2874 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2875 //
2876 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2877 void* ucontext,
2878 int abort_if_unrecognized);
2879
2880 void signalHandler(int sig, siginfo_t* info, void* uc) {
2881 assert(info != NULL && uc != NULL, "it must be old kernel");
2882 int orig_errno = errno; // Preserve errno value over signal handler.
2883 JVM_handle_bsd_signal(sig, info, uc, true);
2884 errno = orig_errno;
2885 }
2886
2887
2888 // This boolean allows users to forward their own non-matching signals
2889 // to JVM_handle_bsd_signal, harmlessly.
2890 bool os::Bsd::signal_handlers_are_installed = false;
2891
2892 // For signal-chaining
2893 struct sigaction sigact[NSIG];
2894 uint32_t sigs = 0;
2895 #if (32 < NSIG-1)
2896 #error "Not all signals can be encoded in sigs. Adapt its type!"
2897 #endif
2898 bool os::Bsd::libjsig_is_loaded = false;
2899 typedef struct sigaction *(*get_signal_t)(int);
2900 get_signal_t os::Bsd::get_signal_action = NULL;
2901
2902 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2903 struct sigaction *actp = NULL;
2904
2905 if (libjsig_is_loaded) {
2906 // Retrieve the old signal handler from libjsig
2907 actp = (*get_signal_action)(sig);
2908 }
2909 if (actp == NULL) {
2910 // Retrieve the preinstalled signal handler from jvm
2911 actp = get_preinstalled_handler(sig);
2912 }
2913
2914 return actp;
2915 }
2916
2917 static bool call_chained_handler(struct sigaction *actp, int sig,
2918 siginfo_t *siginfo, void *context) {
2919 // Call the old signal handler
2920 if (actp->sa_handler == SIG_DFL) {
2921 // It's more reasonable to let jvm treat it as an unexpected exception
2922 // instead of taking the default action.
2923 return false;
2924 } else if (actp->sa_handler != SIG_IGN) {
2925 if ((actp->sa_flags & SA_NODEFER) == 0) {
2926 // automaticlly block the signal
2927 sigaddset(&(actp->sa_mask), sig);
2928 }
2929
2930 sa_handler_t hand;
2931 sa_sigaction_t sa;
2932 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2933 // retrieve the chained handler
2934 if (siginfo_flag_set) {
2935 sa = actp->sa_sigaction;
2936 } else {
2937 hand = actp->sa_handler;
2938 }
2939
2940 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2941 actp->sa_handler = SIG_DFL;
2942 }
2943
2944 // try to honor the signal mask
2945 sigset_t oset;
2946 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2947
2948 // call into the chained handler
2949 if (siginfo_flag_set) {
2950 (*sa)(sig, siginfo, context);
2951 } else {
2952 (*hand)(sig);
2953 }
2954
2955 // restore the signal mask
2956 pthread_sigmask(SIG_SETMASK, &oset, 0);
2957 }
2958 // Tell jvm's signal handler the signal is taken care of.
2959 return true;
2960 }
2961
2962 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2963 bool chained = false;
2964 // signal-chaining
2965 if (UseSignalChaining) {
2966 struct sigaction *actp = get_chained_signal_action(sig);
2967 if (actp != NULL) {
2968 chained = call_chained_handler(actp, sig, siginfo, context);
2969 }
2970 }
2971 return chained;
2972 }
2973
2974 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
2975 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
2976 return &sigact[sig];
2977 }
2978 return NULL;
2979 }
2980
2981 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
2982 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2983 sigact[sig] = oldAct;
2984 sigs |= (uint32_t)1 << (sig-1);
2985 }
2986
2987 // for diagnostic
2988 int sigflags[NSIG];
2989
2990 int os::Bsd::get_our_sigflags(int sig) {
2991 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2992 return sigflags[sig];
2993 }
2994
2995 void os::Bsd::set_our_sigflags(int sig, int flags) {
2996 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2997 if (sig > 0 && sig < NSIG) {
2998 sigflags[sig] = flags;
2999 }
3000 }
3001
3002 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3003 // Check for overwrite.
3004 struct sigaction oldAct;
3005 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3006
3007 void* oldhand = oldAct.sa_sigaction
3008 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3009 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3010 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3011 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3012 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3013 if (AllowUserSignalHandlers || !set_installed) {
3014 // Do not overwrite; user takes responsibility to forward to us.
3015 return;
3016 } else if (UseSignalChaining) {
3017 // save the old handler in jvm
3018 save_preinstalled_handler(sig, oldAct);
3019 // libjsig also interposes the sigaction() call below and saves the
3020 // old sigaction on it own.
3021 } else {
3022 fatal("Encountered unexpected pre-existing sigaction handler "
3023 "%#lx for signal %d.", (long)oldhand, sig);
3024 }
3025 }
3026
3027 struct sigaction sigAct;
3028 sigfillset(&(sigAct.sa_mask));
3029 sigAct.sa_handler = SIG_DFL;
3030 if (!set_installed) {
3031 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3032 } else {
3033 sigAct.sa_sigaction = signalHandler;
3034 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3035 }
3036 #ifdef __APPLE__
3037 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3038 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3039 // if the signal handler declares it will handle it on alternate stack.
3040 // Notice we only declare we will handle it on alt stack, but we are not
3041 // actually going to use real alt stack - this is just a workaround.
3042 // Please see ux_exception.c, method catch_mach_exception_raise for details
3043 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3044 if (sig == SIGSEGV) {
3045 sigAct.sa_flags |= SA_ONSTACK;
3046 }
3047 #endif
3048
3049 // Save flags, which are set by ours
3050 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3051 sigflags[sig] = sigAct.sa_flags;
3052
3053 int ret = sigaction(sig, &sigAct, &oldAct);
3054 assert(ret == 0, "check");
3055
3056 void* oldhand2 = oldAct.sa_sigaction
3057 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3058 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3059 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3060 }
3061
3062 // install signal handlers for signals that HotSpot needs to
3063 // handle in order to support Java-level exception handling.
3064
3065 void os::Bsd::install_signal_handlers() {
3066 if (!signal_handlers_are_installed) {
3067 signal_handlers_are_installed = true;
3068
3069 // signal-chaining
3070 typedef void (*signal_setting_t)();
3071 signal_setting_t begin_signal_setting = NULL;
3072 signal_setting_t end_signal_setting = NULL;
3073 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3074 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3075 if (begin_signal_setting != NULL) {
3076 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3077 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3078 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3079 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3080 libjsig_is_loaded = true;
3081 assert(UseSignalChaining, "should enable signal-chaining");
3082 }
3083 if (libjsig_is_loaded) {
3084 // Tell libjsig jvm is setting signal handlers
3085 (*begin_signal_setting)();
3086 }
3087
3088 set_signal_handler(SIGSEGV, true);
3089 set_signal_handler(SIGPIPE, true);
3090 set_signal_handler(SIGBUS, true);
3091 set_signal_handler(SIGILL, true);
3092 set_signal_handler(SIGFPE, true);
3093 set_signal_handler(SIGXFSZ, true);
3094
3095 #if defined(__APPLE__)
3096 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3097 // signals caught and handled by the JVM. To work around this, we reset the mach task
3098 // signal handler that's placed on our process by CrashReporter. This disables
3099 // CrashReporter-based reporting.
3100 //
3101 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3102 // on caught fatal signals.
3103 //
3104 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3105 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3106 // exception handling, while leaving the standard BSD signal handlers functional.
3107 kern_return_t kr;
3108 kr = task_set_exception_ports(mach_task_self(),
3109 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3110 MACH_PORT_NULL,
3111 EXCEPTION_STATE_IDENTITY,
3112 MACHINE_THREAD_STATE);
3113
3114 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3115 #endif
3116
3117 if (libjsig_is_loaded) {
3118 // Tell libjsig jvm finishes setting signal handlers
3119 (*end_signal_setting)();
3120 }
3121
3122 // We don't activate signal checker if libjsig is in place, we trust ourselves
3123 // and if UserSignalHandler is installed all bets are off
3124 if (CheckJNICalls) {
3125 if (libjsig_is_loaded) {
3126 if (PrintJNIResolving) {
3127 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3128 }
3129 check_signals = false;
3130 }
3131 if (AllowUserSignalHandlers) {
3132 if (PrintJNIResolving) {
3133 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3134 }
3135 check_signals = false;
3136 }
3137 }
3138 }
3139 }
3140
3141
3142 /////
3143 // glibc on Bsd platform uses non-documented flag
3144 // to indicate, that some special sort of signal
3145 // trampoline is used.
3146 // We will never set this flag, and we should
3147 // ignore this flag in our diagnostic
3148 #ifdef SIGNIFICANT_SIGNAL_MASK
3149 #undef SIGNIFICANT_SIGNAL_MASK
3150 #endif
3151 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3152
3153 static const char* get_signal_handler_name(address handler,
3154 char* buf, int buflen) {
3155 int offset;
3156 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3157 if (found) {
3158 // skip directory names
3159 const char *p1, *p2;
3160 p1 = buf;
3161 size_t len = strlen(os::file_separator());
3162 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3163 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3164 } else {
3165 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3166 }
3167 return buf;
3168 }
3169
3170 static void print_signal_handler(outputStream* st, int sig,
3171 char* buf, size_t buflen) {
3172 struct sigaction sa;
3173
3174 sigaction(sig, NULL, &sa);
3175
3176 // See comment for SIGNIFICANT_SIGNAL_MASK define
3177 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3178
3179 st->print("%s: ", os::exception_name(sig, buf, buflen));
3180
3181 address handler = (sa.sa_flags & SA_SIGINFO)
3182 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3183 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3184
3185 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3186 st->print("SIG_DFL");
3187 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3188 st->print("SIG_IGN");
3189 } else {
3190 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3191 }
3192
3193 st->print(", sa_mask[0]=");
3194 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3195
3196 address rh = VMError::get_resetted_sighandler(sig);
3197 // May be, handler was resetted by VMError?
3198 if (rh != NULL) {
3199 handler = rh;
3200 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3201 }
3202
3203 st->print(", sa_flags=");
3204 os::Posix::print_sa_flags(st, sa.sa_flags);
3205
3206 // Check: is it our handler?
3207 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3208 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3209 // It is our signal handler
3210 // check for flags, reset system-used one!
3211 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3212 st->print(
3213 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3214 os::Bsd::get_our_sigflags(sig));
3215 }
3216 }
3217 st->cr();
3218 }
3219
3220
3221 #define DO_SIGNAL_CHECK(sig) \
3222 do { \
3223 if (!sigismember(&check_signal_done, sig)) { \
3224 os::Bsd::check_signal_handler(sig); \
3225 } \
3226 } while (0)
3227
3228 // This method is a periodic task to check for misbehaving JNI applications
3229 // under CheckJNI, we can add any periodic checks here
3230
3231 void os::run_periodic_checks() {
3232
3233 if (check_signals == false) return;
3234
3235 // SEGV and BUS if overridden could potentially prevent
3236 // generation of hs*.log in the event of a crash, debugging
3237 // such a case can be very challenging, so we absolutely
3238 // check the following for a good measure:
3239 DO_SIGNAL_CHECK(SIGSEGV);
3240 DO_SIGNAL_CHECK(SIGILL);
3241 DO_SIGNAL_CHECK(SIGFPE);
3242 DO_SIGNAL_CHECK(SIGBUS);
3243 DO_SIGNAL_CHECK(SIGPIPE);
3244 DO_SIGNAL_CHECK(SIGXFSZ);
3245
3246
3247 // ReduceSignalUsage allows the user to override these handlers
3248 // see comments at the very top and jvm_md.h
3249 if (!ReduceSignalUsage) {
3250 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3251 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3252 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3253 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3254 }
3255
3256 DO_SIGNAL_CHECK(SR_signum);
3257 }
3258
3259 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3260
3261 static os_sigaction_t os_sigaction = NULL;
3262
3263 void os::Bsd::check_signal_handler(int sig) {
3264 char buf[O_BUFLEN];
3265 address jvmHandler = NULL;
3266
3267
3268 struct sigaction act;
3269 if (os_sigaction == NULL) {
3270 // only trust the default sigaction, in case it has been interposed
3271 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3272 if (os_sigaction == NULL) return;
3273 }
3274
3275 os_sigaction(sig, (struct sigaction*)NULL, &act);
3276
3277
3278 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3279
3280 address thisHandler = (act.sa_flags & SA_SIGINFO)
3281 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3282 : CAST_FROM_FN_PTR(address, act.sa_handler);
3283
3284
3285 switch (sig) {
3286 case SIGSEGV:
3287 case SIGBUS:
3288 case SIGFPE:
3289 case SIGPIPE:
3290 case SIGILL:
3291 case SIGXFSZ:
3292 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3293 break;
3294
3295 case SHUTDOWN1_SIGNAL:
3296 case SHUTDOWN2_SIGNAL:
3297 case SHUTDOWN3_SIGNAL:
3298 case BREAK_SIGNAL:
3299 jvmHandler = (address)user_handler();
3300 break;
3301
3302 default:
3303 if (sig == SR_signum) {
3304 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3305 } else {
3306 return;
3307 }
3308 break;
3309 }
3310
3311 if (thisHandler != jvmHandler) {
3312 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3313 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3314 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3315 // No need to check this sig any longer
3316 sigaddset(&check_signal_done, sig);
3317 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3318 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3319 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3320 exception_name(sig, buf, O_BUFLEN));
3321 }
3322 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3323 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3324 tty->print("expected:");
3325 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3326 tty->cr();
3327 tty->print(" found:");
3328 os::Posix::print_sa_flags(tty, act.sa_flags);
3329 tty->cr();
3330 // No need to check this sig any longer
3331 sigaddset(&check_signal_done, sig);
3332 }
3333
3334 // Dump all the signal
3335 if (sigismember(&check_signal_done, sig)) {
3336 print_signal_handlers(tty, buf, O_BUFLEN);
3337 }
3338 }
3339
3340 extern void report_error(char* file_name, int line_no, char* title,
3341 char* format, ...);
3342
3343 // this is called _before_ the most of global arguments have been parsed
3344 void os::init(void) {
3345 char dummy; // used to get a guess on initial stack address
3346
3347 // With BsdThreads the JavaMain thread pid (primordial thread)
3348 // is different than the pid of the java launcher thread.
3349 // So, on Bsd, the launcher thread pid is passed to the VM
3350 // via the sun.java.launcher.pid property.
3351 // Use this property instead of getpid() if it was correctly passed.
3352 // See bug 6351349.
3353 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3354
3355 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3356
3357 clock_tics_per_sec = CLK_TCK;
3358
3359 init_random(1234567);
3360
3361 Bsd::set_page_size(getpagesize());
3362 if (Bsd::page_size() == -1) {
3363 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3364 }
3365 init_page_sizes((size_t) Bsd::page_size());
3366
3367 Bsd::initialize_system_info();
3368
3369 // main_thread points to the thread that created/loaded the JVM
3370 Bsd::_main_thread = pthread_self();
3371
3372 Bsd::clock_init();
3373 initial_time_count = javaTimeNanos();
3374
3375 #ifdef __APPLE__
3376 // XXXDARWIN
3377 // Work around the unaligned VM callbacks in hotspot's
3378 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3379 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3380 // alignment when doing symbol lookup. To work around this, we force early
3381 // binding of all symbols now, thus binding when alignment is known-good.
3382 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3383 #endif
3384
3385 os::Posix::init();
3386 }
3387
3388 // To install functions for atexit system call
3389 extern "C" {
3390 static void perfMemory_exit_helper() {
3391 perfMemory_exit();
3392 }
3393 }
3394
3395 // this is called _after_ the global arguments have been parsed
3396 jint os::init_2(void) {
3397
3398 os::Posix::init_2();
3399
3400 // initialize suspend/resume support - must do this before signal_sets_init()
3401 if (SR_initialize() != 0) {
3402 perror("SR_initialize failed");
3403 return JNI_ERR;
3404 }
3405
3406 Bsd::signal_sets_init();
3407 Bsd::install_signal_handlers();
3408
3409 // Check and sets minimum stack sizes against command line options
3410 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3411 return JNI_ERR;
3412 }
3413
3414 if (MaxFDLimit) {
3415 // set the number of file descriptors to max. print out error
3416 // if getrlimit/setrlimit fails but continue regardless.
3417 struct rlimit nbr_files;
3418 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3419 if (status != 0) {
3420 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3421 } else {
3422 nbr_files.rlim_cur = nbr_files.rlim_max;
3423
3424 #ifdef __APPLE__
3425 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3426 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3427 // be used instead
3428 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3429 #endif
3430
3431 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3432 if (status != 0) {
3433 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3434 }
3435 }
3436 }
3437
3438 // at-exit methods are called in the reverse order of their registration.
3439 // atexit functions are called on return from main or as a result of a
3440 // call to exit(3C). There can be only 32 of these functions registered
3441 // and atexit() does not set errno.
3442
3443 if (PerfAllowAtExitRegistration) {
3444 // only register atexit functions if PerfAllowAtExitRegistration is set.
3445 // atexit functions can be delayed until process exit time, which
3446 // can be problematic for embedded VM situations. Embedded VMs should
3447 // call DestroyJavaVM() to assure that VM resources are released.
3448
3449 // note: perfMemory_exit_helper atexit function may be removed in
3450 // the future if the appropriate cleanup code can be added to the
3451 // VM_Exit VMOperation's doit method.
3452 if (atexit(perfMemory_exit_helper) != 0) {
3453 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3454 }
3455 }
3456
3457 // initialize thread priority policy
3458 prio_init();
3459
3460 #ifdef __APPLE__
3461 // dynamically link to objective c gc registration
3462 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3463 if (handleLibObjc != NULL) {
3464 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3465 }
3466 #endif
3467
3468 return JNI_OK;
3469 }
3470
3471 // Mark the polling page as unreadable
3472 void os::make_polling_page_unreadable(void) {
3473 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3474 fatal("Could not disable polling page");
3475 }
3476 }
3477
3478 // Mark the polling page as readable
3479 void os::make_polling_page_readable(void) {
3480 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3481 fatal("Could not enable polling page");
3482 }
3483 }
3484
3485 int os::active_processor_count() {
3486 return _processor_count;
3487 }
3488
3489 void os::set_native_thread_name(const char *name) {
3490 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3491 // This is only supported in Snow Leopard and beyond
3492 if (name != NULL) {
3493 // Add a "Java: " prefix to the name
3494 char buf[MAXTHREADNAMESIZE];
3495 snprintf(buf, sizeof(buf), "Java: %s", name);
3496 pthread_setname_np(buf);
3497 }
3498 #endif
3499 }
3500
3501 bool os::distribute_processes(uint length, uint* distribution) {
3502 // Not yet implemented.
3503 return false;
3504 }
3505
3506 bool os::bind_to_processor(uint processor_id) {
3507 // Not yet implemented.
3508 return false;
3509 }
3510
3511 void os::SuspendedThreadTask::internal_do_task() {
3512 if (do_suspend(_thread->osthread())) {
3513 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3514 do_task(context);
3515 do_resume(_thread->osthread());
3516 }
3517 }
3518
3519 ////////////////////////////////////////////////////////////////////////////////
3520 // debug support
3521
3522 bool os::find(address addr, outputStream* st) {
3523 Dl_info dlinfo;
3524 memset(&dlinfo, 0, sizeof(dlinfo));
3525 if (dladdr(addr, &dlinfo) != 0) {
3526 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3527 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3528 st->print("%s+%#x", dlinfo.dli_sname,
3529 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3530 } else if (dlinfo.dli_fbase != NULL) {
3531 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3532 } else {
3533 st->print("<absolute address>");
3534 }
3535 if (dlinfo.dli_fname != NULL) {
3536 st->print(" in %s", dlinfo.dli_fname);
3537 }
3538 if (dlinfo.dli_fbase != NULL) {
3539 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3540 }
3541 st->cr();
3542
3543 if (Verbose) {
3544 // decode some bytes around the PC
3545 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3546 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3547 address lowest = (address) dlinfo.dli_sname;
3548 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3549 if (begin < lowest) begin = lowest;
3550 Dl_info dlinfo2;
3551 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3552 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3553 end = (address) dlinfo2.dli_saddr;
3554 }
3555 Disassembler::decode(begin, end, st);
3556 }
3557 return true;
3558 }
3559 return false;
3560 }
3561
3562 ////////////////////////////////////////////////////////////////////////////////
3563 // misc
3564
3565 // This does not do anything on Bsd. This is basically a hook for being
3566 // able to use structured exception handling (thread-local exception filters)
3567 // on, e.g., Win32.
3568 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3569 const methodHandle& method, JavaCallArguments* args,
3570 Thread* thread) {
3571 f(value, method, args, thread);
3572 }
3573
3574 void os::print_statistics() {
3575 }
3576
3577 bool os::message_box(const char* title, const char* message) {
3578 int i;
3579 fdStream err(defaultStream::error_fd());
3580 for (i = 0; i < 78; i++) err.print_raw("=");
3581 err.cr();
3582 err.print_raw_cr(title);
3583 for (i = 0; i < 78; i++) err.print_raw("-");
3584 err.cr();
3585 err.print_raw_cr(message);
3586 for (i = 0; i < 78; i++) err.print_raw("=");
3587 err.cr();
3588
3589 char buf[16];
3590 // Prevent process from exiting upon "read error" without consuming all CPU
3591 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3592
3593 return buf[0] == 'y' || buf[0] == 'Y';
3594 }
3595
3596 int os::stat(const char *path, struct stat *sbuf) {
3597 char pathbuf[MAX_PATH];
3598 if (strlen(path) > MAX_PATH - 1) {
3599 errno = ENAMETOOLONG;
3600 return -1;
3601 }
3602 os::native_path(strcpy(pathbuf, path));
3603 return ::stat(pathbuf, sbuf);
3604 }
3605
3606 static inline struct timespec get_mtime(const char* filename) {
3607 struct stat st;
3608 int ret = os::stat(filename, &st);
3609 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
3610 #ifdef __APPLE__
3611 return st.st_mtimespec;
3612 #else
3613 return st.st_mtim;
3614 #endif
3615 }
3616
3617 int os::compare_file_modified_times(const char* file1, const char* file2) {
3618 struct timespec filetime1 = get_mtime(file1);
3619 struct timespec filetime2 = get_mtime(file2);
3620 int diff = filetime1.tv_sec - filetime2.tv_sec;
3621 if (diff == 0) {
3622 return filetime1.tv_nsec - filetime2.tv_nsec;
3623 }
3624 return diff;
3625 }
3626
3627 // Is a (classpath) directory empty?
3628 bool os::dir_is_empty(const char* path) {
3629 DIR *dir = NULL;
3630 struct dirent *ptr;
3631
3632 dir = opendir(path);
3633 if (dir == NULL) return true;
3634
3635 // Scan the directory
3636 bool result = true;
3637 char buf[sizeof(struct dirent) + MAX_PATH];
3638 while (result && (ptr = ::readdir(dir)) != NULL) {
3639 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3640 result = false;
3641 }
3642 }
3643 closedir(dir);
3644 return result;
3645 }
3646
3647 // This code originates from JDK's sysOpen and open64_w
3648 // from src/solaris/hpi/src/system_md.c
3649
3650 int os::open(const char *path, int oflag, int mode) {
3651 if (strlen(path) > MAX_PATH - 1) {
3652 errno = ENAMETOOLONG;
3653 return -1;
3654 }
3655 int fd;
3656
3657 fd = ::open(path, oflag, mode);
3658 if (fd == -1) return -1;
3659
3660 // If the open succeeded, the file might still be a directory
3661 {
3662 struct stat buf;
3663 int ret = ::fstat(fd, &buf);
3664 int st_mode = buf.st_mode;
3665
3666 if (ret != -1) {
3667 if ((st_mode & S_IFMT) == S_IFDIR) {
3668 errno = EISDIR;
3669 ::close(fd);
3670 return -1;
3671 }
3672 } else {
3673 ::close(fd);
3674 return -1;
3675 }
3676 }
3677
3678 // All file descriptors that are opened in the JVM and not
3679 // specifically destined for a subprocess should have the
3680 // close-on-exec flag set. If we don't set it, then careless 3rd
3681 // party native code might fork and exec without closing all
3682 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3683 // UNIXProcess.c), and this in turn might:
3684 //
3685 // - cause end-of-file to fail to be detected on some file
3686 // descriptors, resulting in mysterious hangs, or
3687 //
3688 // - might cause an fopen in the subprocess to fail on a system
3689 // suffering from bug 1085341.
3690 //
3691 // (Yes, the default setting of the close-on-exec flag is a Unix
3692 // design flaw)
3693 //
3694 // See:
3695 // 1085341: 32-bit stdio routines should support file descriptors >255
3696 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3697 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3698 //
3699 #ifdef FD_CLOEXEC
3700 {
3701 int flags = ::fcntl(fd, F_GETFD);
3702 if (flags != -1) {
3703 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3704 }
3705 }
3706 #endif
3707
3708 return fd;
3709 }
3710
3711
3712 // create binary file, rewriting existing file if required
3713 int os::create_binary_file(const char* path, bool rewrite_existing) {
3714 int oflags = O_WRONLY | O_CREAT;
3715 if (!rewrite_existing) {
3716 oflags |= O_EXCL;
3717 }
3718 return ::open(path, oflags, S_IREAD | S_IWRITE);
3719 }
3720
3721 // return current position of file pointer
3722 jlong os::current_file_offset(int fd) {
3723 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3724 }
3725
3726 // move file pointer to the specified offset
3727 jlong os::seek_to_file_offset(int fd, jlong offset) {
3728 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3729 }
3730
3731 // This code originates from JDK's sysAvailable
3732 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3733
3734 int os::available(int fd, jlong *bytes) {
3735 jlong cur, end;
3736 int mode;
3737 struct stat buf;
3738
3739 if (::fstat(fd, &buf) >= 0) {
3740 mode = buf.st_mode;
3741 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3742 int n;
3743 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3744 *bytes = n;
3745 return 1;
3746 }
3747 }
3748 }
3749 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3750 return 0;
3751 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3752 return 0;
3753 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3754 return 0;
3755 }
3756 *bytes = end - cur;
3757 return 1;
3758 }
3759
3760 // Map a block of memory.
3761 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3762 char *addr, size_t bytes, bool read_only,
3763 bool allow_exec) {
3764 int prot;
3765 int flags;
3766
3767 if (read_only) {
3768 prot = PROT_READ;
3769 flags = MAP_SHARED;
3770 } else {
3771 prot = PROT_READ | PROT_WRITE;
3772 flags = MAP_PRIVATE;
3773 }
3774
3775 if (allow_exec) {
3776 prot |= PROT_EXEC;
3777 }
3778
3779 if (addr != NULL) {
3780 flags |= MAP_FIXED;
3781 }
3782
3783 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3784 fd, file_offset);
3785 if (mapped_address == MAP_FAILED) {
3786 return NULL;
3787 }
3788 return mapped_address;
3789 }
3790
3791
3792 // Remap a block of memory.
3793 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3794 char *addr, size_t bytes, bool read_only,
3795 bool allow_exec) {
3796 // same as map_memory() on this OS
3797 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3798 allow_exec);
3799 }
3800
3801
3802 // Unmap a block of memory.
3803 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3804 return munmap(addr, bytes) == 0;
3805 }
3806
3807 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3808 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3809 // of a thread.
3810 //
3811 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3812 // the fast estimate available on the platform.
3813
3814 jlong os::current_thread_cpu_time() {
3815 #ifdef __APPLE__
3816 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3817 #else
3818 Unimplemented();
3819 return 0;
3820 #endif
3821 }
3822
3823 jlong os::thread_cpu_time(Thread* thread) {
3824 #ifdef __APPLE__
3825 return os::thread_cpu_time(thread, true /* user + sys */);
3826 #else
3827 Unimplemented();
3828 return 0;
3829 #endif
3830 }
3831
3832 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3833 #ifdef __APPLE__
3834 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3835 #else
3836 Unimplemented();
3837 return 0;
3838 #endif
3839 }
3840
3841 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3842 #ifdef __APPLE__
3843 struct thread_basic_info tinfo;
3844 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3845 kern_return_t kr;
3846 thread_t mach_thread;
3847
3848 mach_thread = thread->osthread()->thread_id();
3849 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3850 if (kr != KERN_SUCCESS) {
3851 return -1;
3852 }
3853
3854 if (user_sys_cpu_time) {
3855 jlong nanos;
3856 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3857 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3858 return nanos;
3859 } else {
3860 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3861 }
3862 #else
3863 Unimplemented();
3864 return 0;
3865 #endif
3866 }
3867
3868
3869 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3870 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3871 info_ptr->may_skip_backward = false; // elapsed time not wall time
3872 info_ptr->may_skip_forward = false; // elapsed time not wall time
3873 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3874 }
3875
3876 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3877 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3878 info_ptr->may_skip_backward = false; // elapsed time not wall time
3879 info_ptr->may_skip_forward = false; // elapsed time not wall time
3880 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3881 }
3882
3883 bool os::is_thread_cpu_time_supported() {
3884 #ifdef __APPLE__
3885 return true;
3886 #else
3887 return false;
3888 #endif
3889 }
3890
3891 // System loadavg support. Returns -1 if load average cannot be obtained.
3892 // Bsd doesn't yet have a (official) notion of processor sets,
3893 // so just return the system wide load average.
3894 int os::loadavg(double loadavg[], int nelem) {
3895 return ::getloadavg(loadavg, nelem);
3896 }
3897
3898 void os::pause() {
3899 char filename[MAX_PATH];
3900 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3901 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3902 } else {
3903 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3904 }
3905
3906 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3907 if (fd != -1) {
3908 struct stat buf;
3909 ::close(fd);
3910 while (::stat(filename, &buf) == 0) {
3911 (void)::poll(NULL, 0, 100);
3912 }
3913 } else {
3914 jio_fprintf(stderr,
3915 "Could not open pause file '%s', continuing immediately.\n", filename);
3916 }
3917 }
3918
3919 // Darwin has no "environ" in a dynamic library.
3920 #ifdef __APPLE__
3921 #include <crt_externs.h>
3922 #define environ (*_NSGetEnviron())
3923 #else
3924 extern char** environ;
3925 #endif
3926
3927 // Run the specified command in a separate process. Return its exit value,
3928 // or -1 on failure (e.g. can't fork a new process).
3929 // Unlike system(), this function can be called from signal handler. It
3930 // doesn't block SIGINT et al.
3931 int os::fork_and_exec(char* cmd) {
3932 const char * argv[4] = {"sh", "-c", cmd, NULL};
3933
3934 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3935 // pthread_atfork handlers and reset pthread library. All we need is a
3936 // separate process to execve. Make a direct syscall to fork process.
3937 // On IA64 there's no fork syscall, we have to use fork() and hope for
3938 // the best...
3939 pid_t pid = fork();
3940
3941 if (pid < 0) {
3942 // fork failed
3943 return -1;
3944
3945 } else if (pid == 0) {
3946 // child process
3947
3948 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3949 // first to kill every thread on the thread list. Because this list is
3950 // not reset by fork() (see notes above), execve() will instead kill
3951 // every thread in the parent process. We know this is the only thread
3952 // in the new process, so make a system call directly.
3953 // IA64 should use normal execve() from glibc to match the glibc fork()
3954 // above.
3955 execve("/bin/sh", (char* const*)argv, environ);
3956
3957 // execve failed
3958 _exit(-1);
3959
3960 } else {
3961 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3962 // care about the actual exit code, for now.
3963
3964 int status;
3965
3966 // Wait for the child process to exit. This returns immediately if
3967 // the child has already exited. */
3968 while (waitpid(pid, &status, 0) < 0) {
3969 switch (errno) {
3970 case ECHILD: return 0;
3971 case EINTR: break;
3972 default: return -1;
3973 }
3974 }
3975
3976 if (WIFEXITED(status)) {
3977 // The child exited normally; get its exit code.
3978 return WEXITSTATUS(status);
3979 } else if (WIFSIGNALED(status)) {
3980 // The child exited because of a signal
3981 // The best value to return is 0x80 + signal number,
3982 // because that is what all Unix shells do, and because
3983 // it allows callers to distinguish between process exit and
3984 // process death by signal.
3985 return 0x80 + WTERMSIG(status);
3986 } else {
3987 // Unknown exit code; pass it through
3988 return status;
3989 }
3990 }
3991 }
3992
3993 // is_headless_jre()
3994 //
3995 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
3996 // in order to report if we are running in a headless jre
3997 //
3998 // Since JDK8 xawt/libmawt.so was moved into the same directory
3999 // as libawt.so, and renamed libawt_xawt.so
4000 //
4001 bool os::is_headless_jre() {
4002 #ifdef __APPLE__
4003 // We no longer build headless-only on Mac OS X
4004 return false;
4005 #else
4006 struct stat statbuf;
4007 char buf[MAXPATHLEN];
4008 char libmawtpath[MAXPATHLEN];
4009 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4010 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4011 char *p;
4012
4013 // Get path to libjvm.so
4014 os::jvm_path(buf, sizeof(buf));
4015
4016 // Get rid of libjvm.so
4017 p = strrchr(buf, '/');
4018 if (p == NULL) {
4019 return false;
4020 } else {
4021 *p = '\0';
4022 }
4023
4024 // Get rid of client or server
4025 p = strrchr(buf, '/');
4026 if (p == NULL) {
4027 return false;
4028 } else {
4029 *p = '\0';
4030 }
4031
4032 // check xawt/libmawt.so
4033 strcpy(libmawtpath, buf);
4034 strcat(libmawtpath, xawtstr);
4035 if (::stat(libmawtpath, &statbuf) == 0) return false;
4036
4037 // check libawt_xawt.so
4038 strcpy(libmawtpath, buf);
4039 strcat(libmawtpath, new_xawtstr);
4040 if (::stat(libmawtpath, &statbuf) == 0) return false;
4041
4042 return true;
4043 #endif
4044 }
4045
4046 // Get the default path to the core file
4047 // Returns the length of the string
4048 int os::get_core_path(char* buffer, size_t bufferSize) {
4049 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
4050
4051 // Truncate if theoretical string was longer than bufferSize
4052 n = MIN2(n, (int)bufferSize);
4053
4054 return n;
4055 }
4056
4057 #ifndef PRODUCT
4058 void TestReserveMemorySpecial_test() {
4059 // No tests available for this platform
4060 }
4061 #endif
4062
4063 bool os::start_debugging(char *buf, int buflen) {
4064 int len = (int)strlen(buf);
4065 char *p = &buf[len];
4066
4067 jio_snprintf(p, buflen-len,
4068 "\n\n"
4069 "Do you want to debug the problem?\n\n"
4070 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
4071 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
4072 "Otherwise, press RETURN to abort...",
4073 os::current_process_id(), os::current_process_id(),
4074 os::current_thread_id(), os::current_thread_id());
4075
4076 bool yes = os::message_box("Unexpected Error", buf);
4077
4078 if (yes) {
4079 // yes, user asked VM to launch debugger
4080 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
4081 os::current_process_id(), os::current_process_id());
4082
4083 os::fork_and_exec(buf);
4084 yes = false;
4085 }
4086 return yes;
4087 }