1 /*
2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_bsd.h"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_bsd.inline.hpp"
40 #include "os_share_bsd.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm.h"
43 #include "prims/jvm_misc.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/atomic.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/orderAccess.inline.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "semaphore_bsd.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/vmError.hpp"
72
73 // put OS-includes here
74 # include <sys/types.h>
75 # include <sys/mman.h>
76 # include <sys/stat.h>
77 # include <sys/select.h>
78 # include <pthread.h>
79 # include <signal.h>
80 # include <errno.h>
81 # include <dlfcn.h>
82 # include <stdio.h>
83 # include <unistd.h>
84 # include <sys/resource.h>
85 # include <pthread.h>
86 # include <sys/stat.h>
87 # include <sys/time.h>
88 # include <sys/times.h>
89 # include <sys/utsname.h>
90 # include <sys/socket.h>
91 # include <sys/wait.h>
92 # include <time.h>
93 # include <pwd.h>
94 # include <poll.h>
95 # include <semaphore.h>
96 # include <fcntl.h>
97 # include <string.h>
98 # include <sys/param.h>
99 # include <sys/sysctl.h>
100 # include <sys/ipc.h>
101 # include <sys/shm.h>
102 #ifndef __APPLE__
103 # include <link.h>
104 #endif
105 # include <stdint.h>
106 # include <inttypes.h>
107 # include <sys/ioctl.h>
108 # include <sys/syscall.h>
109
110 #if defined(__FreeBSD__) || defined(__NetBSD__)
111 #include <elf.h>
112 #endif
113
114 #ifdef __APPLE__
115 #include <mach/mach.h> // semaphore_* API
116 #include <mach-o/dyld.h>
117 #include <sys/proc_info.h>
118 #include <objc/objc-auto.h>
119 #endif
120
121 #ifndef MAP_ANONYMOUS
122 #define MAP_ANONYMOUS MAP_ANON
123 #endif
124
125 #define MAX_PATH (2 * K)
126
127 // for timer info max values which include all bits
128 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
129
130 #define LARGEPAGES_BIT (1 << 6)
131
132 ////////////////////////////////////////////////////////////////////////////////
133 // global variables
134 julong os::Bsd::_physical_memory = 0;
135
136 #ifdef __APPLE__
137 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
138 volatile uint64_t os::Bsd::_max_abstime = 0;
139 #else
140 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
141 #endif
142 pthread_t os::Bsd::_main_thread;
143 int os::Bsd::_page_size = -1;
144
145 static jlong initial_time_count=0;
146
147 static int clock_tics_per_sec = 100;
148
149 // For diagnostics to print a message once. see run_periodic_checks
150 static sigset_t check_signal_done;
151 static bool check_signals = true;
152
153 static pid_t _initial_pid = 0;
154
155 // Signal number used to suspend/resume a thread
156
157 // do not use any signal number less than SIGSEGV, see 4355769
158 static int SR_signum = SIGUSR2;
159 sigset_t SR_sigset;
160
161
162 ////////////////////////////////////////////////////////////////////////////////
163 // utility functions
164
165 static int SR_initialize();
166
167 julong os::available_memory() {
168 return Bsd::available_memory();
169 }
170
171 // available here means free
172 julong os::Bsd::available_memory() {
173 uint64_t available = physical_memory() >> 2;
174 #ifdef __APPLE__
175 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
176 vm_statistics64_data_t vmstat;
177 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
178 (host_info64_t)&vmstat, &count);
179 assert(kerr == KERN_SUCCESS,
180 "host_statistics64 failed - check mach_host_self() and count");
181 if (kerr == KERN_SUCCESS) {
182 available = vmstat.free_count * os::vm_page_size();
183 }
184 #endif
185 return available;
186 }
187
188 julong os::physical_memory() {
189 return Bsd::physical_memory();
190 }
191
192 // Return true if user is running as root.
193
194 bool os::have_special_privileges() {
195 static bool init = false;
196 static bool privileges = false;
197 if (!init) {
198 privileges = (getuid() != geteuid()) || (getgid() != getegid());
199 init = true;
200 }
201 return privileges;
202 }
203
204
205
206 // Cpu architecture string
207 #if defined(ZERO)
208 static char cpu_arch[] = ZERO_LIBARCH;
209 #elif defined(IA64)
210 static char cpu_arch[] = "ia64";
211 #elif defined(IA32)
212 static char cpu_arch[] = "i386";
213 #elif defined(AMD64)
214 static char cpu_arch[] = "amd64";
215 #elif defined(ARM)
216 static char cpu_arch[] = "arm";
217 #elif defined(PPC32)
218 static char cpu_arch[] = "ppc";
219 #elif defined(SPARC)
220 #ifdef _LP64
221 static char cpu_arch[] = "sparcv9";
222 #else
223 static char cpu_arch[] = "sparc";
224 #endif
225 #else
226 #error Add appropriate cpu_arch setting
227 #endif
228
229 // Compiler variant
230 #ifdef COMPILER2
231 #define COMPILER_VARIANT "server"
232 #else
233 #define COMPILER_VARIANT "client"
234 #endif
235
236
237 void os::Bsd::initialize_system_info() {
238 int mib[2];
239 size_t len;
240 int cpu_val;
241 julong mem_val;
242
243 // get processors count via hw.ncpus sysctl
244 mib[0] = CTL_HW;
245 mib[1] = HW_NCPU;
246 len = sizeof(cpu_val);
247 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
248 assert(len == sizeof(cpu_val), "unexpected data size");
249 set_processor_count(cpu_val);
250 } else {
251 set_processor_count(1); // fallback
252 }
253
254 // get physical memory via hw.memsize sysctl (hw.memsize is used
255 // since it returns a 64 bit value)
256 mib[0] = CTL_HW;
257
258 #if defined (HW_MEMSIZE) // Apple
259 mib[1] = HW_MEMSIZE;
260 #elif defined(HW_PHYSMEM) // Most of BSD
261 mib[1] = HW_PHYSMEM;
262 #elif defined(HW_REALMEM) // Old FreeBSD
263 mib[1] = HW_REALMEM;
264 #else
265 #error No ways to get physmem
266 #endif
267
268 len = sizeof(mem_val);
269 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
270 assert(len == sizeof(mem_val), "unexpected data size");
271 _physical_memory = mem_val;
272 } else {
273 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
274 }
275
276 #ifdef __OpenBSD__
277 {
278 // limit _physical_memory memory view on OpenBSD since
279 // datasize rlimit restricts us anyway.
280 struct rlimit limits;
281 getrlimit(RLIMIT_DATA, &limits);
282 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
283 }
284 #endif
285 }
286
287 #ifdef __APPLE__
288 static const char *get_home() {
289 const char *home_dir = ::getenv("HOME");
290 if ((home_dir == NULL) || (*home_dir == '\0')) {
291 struct passwd *passwd_info = getpwuid(geteuid());
292 if (passwd_info != NULL) {
293 home_dir = passwd_info->pw_dir;
294 }
295 }
296
297 return home_dir;
298 }
299 #endif
300
301 void os::init_system_properties_values() {
302 // The next steps are taken in the product version:
303 //
304 // Obtain the JAVA_HOME value from the location of libjvm.so.
305 // This library should be located at:
306 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
307 //
308 // If "/jre/lib/" appears at the right place in the path, then we
309 // assume libjvm.so is installed in a JDK and we use this path.
310 //
311 // Otherwise exit with message: "Could not create the Java virtual machine."
312 //
313 // The following extra steps are taken in the debugging version:
314 //
315 // If "/jre/lib/" does NOT appear at the right place in the path
316 // instead of exit check for $JAVA_HOME environment variable.
317 //
318 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
319 // then we append a fake suffix "hotspot/libjvm.so" to this path so
320 // it looks like libjvm.so is installed there
321 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
322 //
323 // Otherwise exit.
324 //
325 // Important note: if the location of libjvm.so changes this
326 // code needs to be changed accordingly.
327
328 // See ld(1):
329 // The linker uses the following search paths to locate required
330 // shared libraries:
331 // 1: ...
332 // ...
333 // 7: The default directories, normally /lib and /usr/lib.
334 #ifndef DEFAULT_LIBPATH
335 #define DEFAULT_LIBPATH "/lib:/usr/lib"
336 #endif
337
338 // Base path of extensions installed on the system.
339 #define SYS_EXT_DIR "/usr/java/packages"
340 #define EXTENSIONS_DIR "/lib/ext"
341
342 #ifndef __APPLE__
343
344 // Buffer that fits several sprintfs.
345 // Note that the space for the colon and the trailing null are provided
346 // by the nulls included by the sizeof operator.
347 const size_t bufsize =
348 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
349 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
350 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
351
352 // sysclasspath, java_home, dll_dir
353 {
354 char *pslash;
355 os::jvm_path(buf, bufsize);
356
357 // Found the full path to libjvm.so.
358 // Now cut the path to <java_home>/jre if we can.
359 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
360 pslash = strrchr(buf, '/');
361 if (pslash != NULL) {
362 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
363 }
364 Arguments::set_dll_dir(buf);
365
366 if (pslash != NULL) {
367 pslash = strrchr(buf, '/');
368 if (pslash != NULL) {
369 *pslash = '\0'; // Get rid of /<arch>.
370 pslash = strrchr(buf, '/');
371 if (pslash != NULL) {
372 *pslash = '\0'; // Get rid of /lib.
373 }
374 }
375 }
376 Arguments::set_java_home(buf);
377 set_boot_path('/', ':');
378 }
379
380 // Where to look for native libraries.
381 //
382 // Note: Due to a legacy implementation, most of the library path
383 // is set in the launcher. This was to accomodate linking restrictions
384 // on legacy Bsd implementations (which are no longer supported).
385 // Eventually, all the library path setting will be done here.
386 //
387 // However, to prevent the proliferation of improperly built native
388 // libraries, the new path component /usr/java/packages is added here.
389 // Eventually, all the library path setting will be done here.
390 {
391 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
392 // should always exist (until the legacy problem cited above is
393 // addressed).
394 const char *v = ::getenv("LD_LIBRARY_PATH");
395 const char *v_colon = ":";
396 if (v == NULL) { v = ""; v_colon = ""; }
397 // That's +1 for the colon and +1 for the trailing '\0'.
398 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
399 strlen(v) + 1 +
400 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
401 mtInternal);
402 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
403 Arguments::set_library_path(ld_library_path);
404 FREE_C_HEAP_ARRAY(char, ld_library_path);
405 }
406
407 // Extensions directories.
408 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
409 Arguments::set_ext_dirs(buf);
410
411 FREE_C_HEAP_ARRAY(char, buf);
412
413 #else // __APPLE__
414
415 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
416 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
417
418 const char *user_home_dir = get_home();
419 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
420 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
421 sizeof(SYS_EXTENSIONS_DIRS);
422
423 // Buffer that fits several sprintfs.
424 // Note that the space for the colon and the trailing null are provided
425 // by the nulls included by the sizeof operator.
426 const size_t bufsize =
427 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
428 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
429 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
430
431 // sysclasspath, java_home, dll_dir
432 {
433 char *pslash;
434 os::jvm_path(buf, bufsize);
435
436 // Found the full path to libjvm.so.
437 // Now cut the path to <java_home>/jre if we can.
438 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
439 pslash = strrchr(buf, '/');
440 if (pslash != NULL) {
441 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
442 }
443 #ifdef STATIC_BUILD
444 strcat(buf, "/lib");
445 #endif
446
447 Arguments::set_dll_dir(buf);
448
449 if (pslash != NULL) {
450 pslash = strrchr(buf, '/');
451 if (pslash != NULL) {
452 *pslash = '\0'; // Get rid of /lib.
453 }
454 }
455 Arguments::set_java_home(buf);
456 set_boot_path('/', ':');
457 }
458
459 // Where to look for native libraries.
460 //
461 // Note: Due to a legacy implementation, most of the library path
462 // is set in the launcher. This was to accomodate linking restrictions
463 // on legacy Bsd implementations (which are no longer supported).
464 // Eventually, all the library path setting will be done here.
465 //
466 // However, to prevent the proliferation of improperly built native
467 // libraries, the new path component /usr/java/packages is added here.
468 // Eventually, all the library path setting will be done here.
469 {
470 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
471 // should always exist (until the legacy problem cited above is
472 // addressed).
473 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
474 // can specify a directory inside an app wrapper
475 const char *l = ::getenv("JAVA_LIBRARY_PATH");
476 const char *l_colon = ":";
477 if (l == NULL) { l = ""; l_colon = ""; }
478
479 const char *v = ::getenv("DYLD_LIBRARY_PATH");
480 const char *v_colon = ":";
481 if (v == NULL) { v = ""; v_colon = ""; }
482
483 // Apple's Java6 has "." at the beginning of java.library.path.
484 // OpenJDK on Windows has "." at the end of java.library.path.
485 // OpenJDK on Linux and Solaris don't have "." in java.library.path
486 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
487 // "." is appended to the end of java.library.path. Yes, this
488 // could cause a change in behavior, but Apple's Java6 behavior
489 // can be achieved by putting "." at the beginning of the
490 // JAVA_LIBRARY_PATH environment variable.
491 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
492 strlen(v) + 1 + strlen(l) + 1 +
493 system_ext_size + 3,
494 mtInternal);
495 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
496 v, v_colon, l, l_colon, user_home_dir);
497 Arguments::set_library_path(ld_library_path);
498 FREE_C_HEAP_ARRAY(char, ld_library_path);
499 }
500
501 // Extensions directories.
502 //
503 // Note that the space for the colon and the trailing null are provided
504 // by the nulls included by the sizeof operator (so actually one byte more
505 // than necessary is allocated).
506 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
507 user_home_dir, Arguments::get_java_home());
508 Arguments::set_ext_dirs(buf);
509
510 FREE_C_HEAP_ARRAY(char, buf);
511
512 #undef SYS_EXTENSIONS_DIR
513 #undef SYS_EXTENSIONS_DIRS
514
515 #endif // __APPLE__
516
517 #undef SYS_EXT_DIR
518 #undef EXTENSIONS_DIR
519 }
520
521 ////////////////////////////////////////////////////////////////////////////////
522 // breakpoint support
523
524 void os::breakpoint() {
525 BREAKPOINT;
526 }
527
528 extern "C" void breakpoint() {
529 // use debugger to set breakpoint here
530 }
531
532 ////////////////////////////////////////////////////////////////////////////////
533 // signal support
534
535 debug_only(static bool signal_sets_initialized = false);
536 static sigset_t unblocked_sigs, vm_sigs;
537
538 bool os::Bsd::is_sig_ignored(int sig) {
539 struct sigaction oact;
540 sigaction(sig, (struct sigaction*)NULL, &oact);
541 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
542 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
543 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
544 return true;
545 } else {
546 return false;
547 }
548 }
549
550 void os::Bsd::signal_sets_init() {
551 // Should also have an assertion stating we are still single-threaded.
552 assert(!signal_sets_initialized, "Already initialized");
553 // Fill in signals that are necessarily unblocked for all threads in
554 // the VM. Currently, we unblock the following signals:
555 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
556 // by -Xrs (=ReduceSignalUsage));
557 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
558 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
559 // the dispositions or masks wrt these signals.
560 // Programs embedding the VM that want to use the above signals for their
561 // own purposes must, at this time, use the "-Xrs" option to prevent
562 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
563 // (See bug 4345157, and other related bugs).
564 // In reality, though, unblocking these signals is really a nop, since
565 // these signals are not blocked by default.
566 sigemptyset(&unblocked_sigs);
567 sigaddset(&unblocked_sigs, SIGILL);
568 sigaddset(&unblocked_sigs, SIGSEGV);
569 sigaddset(&unblocked_sigs, SIGBUS);
570 sigaddset(&unblocked_sigs, SIGFPE);
571 sigaddset(&unblocked_sigs, SR_signum);
572
573 if (!ReduceSignalUsage) {
574 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
575 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
576
577 }
578 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
579 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
580 }
581 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
582 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
583 }
584 }
585 // Fill in signals that are blocked by all but the VM thread.
586 sigemptyset(&vm_sigs);
587 if (!ReduceSignalUsage) {
588 sigaddset(&vm_sigs, BREAK_SIGNAL);
589 }
590 debug_only(signal_sets_initialized = true);
591
592 }
593
594 // These are signals that are unblocked while a thread is running Java.
595 // (For some reason, they get blocked by default.)
596 sigset_t* os::Bsd::unblocked_signals() {
597 assert(signal_sets_initialized, "Not initialized");
598 return &unblocked_sigs;
599 }
600
601 // These are the signals that are blocked while a (non-VM) thread is
602 // running Java. Only the VM thread handles these signals.
603 sigset_t* os::Bsd::vm_signals() {
604 assert(signal_sets_initialized, "Not initialized");
605 return &vm_sigs;
606 }
607
608 void os::Bsd::hotspot_sigmask(Thread* thread) {
609
610 //Save caller's signal mask before setting VM signal mask
611 sigset_t caller_sigmask;
612 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
613
614 OSThread* osthread = thread->osthread();
615 osthread->set_caller_sigmask(caller_sigmask);
616
617 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
618
619 if (!ReduceSignalUsage) {
620 if (thread->is_VM_thread()) {
621 // Only the VM thread handles BREAK_SIGNAL ...
622 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
623 } else {
624 // ... all other threads block BREAK_SIGNAL
625 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
626 }
627 }
628 }
629
630
631 //////////////////////////////////////////////////////////////////////////////
632 // create new thread
633
634 #ifdef __APPLE__
635 // library handle for calling objc_registerThreadWithCollector()
636 // without static linking to the libobjc library
637 #define OBJC_LIB "/usr/lib/libobjc.dylib"
638 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
639 typedef void (*objc_registerThreadWithCollector_t)();
640 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
641 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
642 #endif
643
644 #ifdef __APPLE__
645 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
646 // Additional thread_id used to correlate threads in SA
647 thread_identifier_info_data_t m_ident_info;
648 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
649
650 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
651 (thread_info_t) &m_ident_info, &count);
652
653 return m_ident_info.thread_id;
654 }
655 #endif
656
657 // Thread start routine for all newly created threads
658 static void *thread_native_entry(Thread *thread) {
659 // Try to randomize the cache line index of hot stack frames.
660 // This helps when threads of the same stack traces evict each other's
661 // cache lines. The threads can be either from the same JVM instance, or
662 // from different JVM instances. The benefit is especially true for
663 // processors with hyperthreading technology.
664 static int counter = 0;
665 int pid = os::current_process_id();
666 alloca(((pid ^ counter++) & 7) * 128);
667
668 thread->initialize_thread_current();
669
670 OSThread* osthread = thread->osthread();
671 Monitor* sync = osthread->startThread_lock();
672
673 osthread->set_thread_id(os::Bsd::gettid());
674
675 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
676 os::current_thread_id(), (uintx) pthread_self());
677
678 #ifdef __APPLE__
679 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
680 guarantee(unique_thread_id != 0, "unique thread id was not found");
681 osthread->set_unique_thread_id(unique_thread_id);
682 #endif
683 // initialize signal mask for this thread
684 os::Bsd::hotspot_sigmask(thread);
685
686 // initialize floating point control register
687 os::Bsd::init_thread_fpu_state();
688
689 #ifdef __APPLE__
690 // register thread with objc gc
691 if (objc_registerThreadWithCollectorFunction != NULL) {
692 objc_registerThreadWithCollectorFunction();
693 }
694 #endif
695
696 // handshaking with parent thread
697 {
698 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
699
700 // notify parent thread
701 osthread->set_state(INITIALIZED);
702 sync->notify_all();
703
704 // wait until os::start_thread()
705 while (osthread->get_state() == INITIALIZED) {
706 sync->wait(Mutex::_no_safepoint_check_flag);
707 }
708 }
709
710 // call one more level start routine
711 thread->run();
712
713 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
714 os::current_thread_id(), (uintx) pthread_self());
715
716 // If a thread has not deleted itself ("delete this") as part of its
717 // termination sequence, we have to ensure thread-local-storage is
718 // cleared before we actually terminate. No threads should ever be
719 // deleted asynchronously with respect to their termination.
720 if (Thread::current_or_null_safe() != NULL) {
721 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
722 thread->clear_thread_current();
723 }
724
725 return 0;
726 }
727
728 bool os::create_thread(Thread* thread, ThreadType thr_type,
729 size_t req_stack_size) {
730 assert(thread->osthread() == NULL, "caller responsible");
731
732 // Allocate the OSThread object
733 OSThread* osthread = new OSThread(NULL, NULL);
734 if (osthread == NULL) {
735 return false;
736 }
737
738 // set the correct thread state
739 osthread->set_thread_type(thr_type);
740
741 // Initial state is ALLOCATED but not INITIALIZED
742 osthread->set_state(ALLOCATED);
743
744 thread->set_osthread(osthread);
745
746 // init thread attributes
747 pthread_attr_t attr;
748 pthread_attr_init(&attr);
749 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
750
751 // calculate stack size if it's not specified by caller
752 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
753 int status = pthread_attr_setstacksize(&attr, stack_size);
754 assert_status(status == 0, status, "pthread_attr_setstacksize");
755
756 ThreadState state;
757
758 {
759 pthread_t tid;
760 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
761
762 char buf[64];
763 if (ret == 0) {
764 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
765 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
766 } else {
767 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
768 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
769 }
770
771 pthread_attr_destroy(&attr);
772
773 if (ret != 0) {
774 // Need to clean up stuff we've allocated so far
775 thread->set_osthread(NULL);
776 delete osthread;
777 return false;
778 }
779
780 // Store pthread info into the OSThread
781 osthread->set_pthread_id(tid);
782
783 // Wait until child thread is either initialized or aborted
784 {
785 Monitor* sync_with_child = osthread->startThread_lock();
786 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
787 while ((state = osthread->get_state()) == ALLOCATED) {
788 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
789 }
790 }
791
792 }
793
794 // Aborted due to thread limit being reached
795 if (state == ZOMBIE) {
796 thread->set_osthread(NULL);
797 delete osthread;
798 return false;
799 }
800
801 // The thread is returned suspended (in state INITIALIZED),
802 // and is started higher up in the call chain
803 assert(state == INITIALIZED, "race condition");
804 return true;
805 }
806
807 /////////////////////////////////////////////////////////////////////////////
808 // attach existing thread
809
810 // bootstrap the main thread
811 bool os::create_main_thread(JavaThread* thread) {
812 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
813 return create_attached_thread(thread);
814 }
815
816 bool os::create_attached_thread(JavaThread* thread) {
817 #ifdef ASSERT
818 thread->verify_not_published();
819 #endif
820
821 // Allocate the OSThread object
822 OSThread* osthread = new OSThread(NULL, NULL);
823
824 if (osthread == NULL) {
825 return false;
826 }
827
828 osthread->set_thread_id(os::Bsd::gettid());
829
830 // Store pthread info into the OSThread
831 #ifdef __APPLE__
832 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
833 guarantee(unique_thread_id != 0, "just checking");
834 osthread->set_unique_thread_id(unique_thread_id);
835 #endif
836 osthread->set_pthread_id(::pthread_self());
837
838 // initialize floating point control register
839 os::Bsd::init_thread_fpu_state();
840
841 // Initial thread state is RUNNABLE
842 osthread->set_state(RUNNABLE);
843
844 thread->set_osthread(osthread);
845
846 // initialize signal mask for this thread
847 // and save the caller's signal mask
848 os::Bsd::hotspot_sigmask(thread);
849
850 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
851 os::current_thread_id(), (uintx) pthread_self());
852
853 return true;
854 }
855
856 void os::pd_start_thread(Thread* thread) {
857 OSThread * osthread = thread->osthread();
858 assert(osthread->get_state() != INITIALIZED, "just checking");
859 Monitor* sync_with_child = osthread->startThread_lock();
860 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
861 sync_with_child->notify();
862 }
863
864 // Free Bsd resources related to the OSThread
865 void os::free_thread(OSThread* osthread) {
866 assert(osthread != NULL, "osthread not set");
867
868 // We are told to free resources of the argument thread,
869 // but we can only really operate on the current thread.
870 assert(Thread::current()->osthread() == osthread,
871 "os::free_thread but not current thread");
872
873 // Restore caller's signal mask
874 sigset_t sigmask = osthread->caller_sigmask();
875 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
876
877 delete osthread;
878 }
879
880 ////////////////////////////////////////////////////////////////////////////////
881 // time support
882
883 // Time since start-up in seconds to a fine granularity.
884 // Used by VMSelfDestructTimer and the MemProfiler.
885 double os::elapsedTime() {
886
887 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
888 }
889
890 jlong os::elapsed_counter() {
891 return javaTimeNanos() - initial_time_count;
892 }
893
894 jlong os::elapsed_frequency() {
895 return NANOSECS_PER_SEC; // nanosecond resolution
896 }
897
898 bool os::supports_vtime() { return true; }
899 bool os::enable_vtime() { return false; }
900 bool os::vtime_enabled() { return false; }
901
902 double os::elapsedVTime() {
903 // better than nothing, but not much
904 return elapsedTime();
905 }
906
907 jlong os::javaTimeMillis() {
908 timeval time;
909 int status = gettimeofday(&time, NULL);
910 assert(status != -1, "bsd error");
911 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
912 }
913
914 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
915 timeval time;
916 int status = gettimeofday(&time, NULL);
917 assert(status != -1, "bsd error");
918 seconds = jlong(time.tv_sec);
919 nanos = jlong(time.tv_usec) * 1000;
920 }
921
922 #ifndef __APPLE__
923 #ifndef CLOCK_MONOTONIC
924 #define CLOCK_MONOTONIC (1)
925 #endif
926 #endif
927
928 #ifdef __APPLE__
929 void os::Bsd::clock_init() {
930 mach_timebase_info(&_timebase_info);
931 }
932 #else
933 void os::Bsd::clock_init() {
934 struct timespec res;
935 struct timespec tp;
936 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
937 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
938 // yes, monotonic clock is supported
939 _clock_gettime = ::clock_gettime;
940 }
941 }
942 #endif
943
944
945
946 #ifdef __APPLE__
947
948 jlong os::javaTimeNanos() {
949 const uint64_t tm = mach_absolute_time();
950 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
951 const uint64_t prev = Bsd::_max_abstime;
952 if (now <= prev) {
953 return prev; // same or retrograde time;
954 }
955 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
956 assert(obsv >= prev, "invariant"); // Monotonicity
957 // If the CAS succeeded then we're done and return "now".
958 // If the CAS failed and the observed value "obsv" is >= now then
959 // we should return "obsv". If the CAS failed and now > obsv > prv then
960 // some other thread raced this thread and installed a new value, in which case
961 // we could either (a) retry the entire operation, (b) retry trying to install now
962 // or (c) just return obsv. We use (c). No loop is required although in some cases
963 // we might discard a higher "now" value in deference to a slightly lower but freshly
964 // installed obsv value. That's entirely benign -- it admits no new orderings compared
965 // to (a) or (b) -- and greatly reduces coherence traffic.
966 // We might also condition (c) on the magnitude of the delta between obsv and now.
967 // Avoiding excessive CAS operations to hot RW locations is critical.
968 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
969 return (prev == obsv) ? now : obsv;
970 }
971
972 #else // __APPLE__
973
974 jlong os::javaTimeNanos() {
975 if (os::supports_monotonic_clock()) {
976 struct timespec tp;
977 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
978 assert(status == 0, "gettime error");
979 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
980 return result;
981 } else {
982 timeval time;
983 int status = gettimeofday(&time, NULL);
984 assert(status != -1, "bsd error");
985 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
986 return 1000 * usecs;
987 }
988 }
989
990 #endif // __APPLE__
991
992 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
993 if (os::supports_monotonic_clock()) {
994 info_ptr->max_value = ALL_64_BITS;
995
996 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
997 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
998 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
999 } else {
1000 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1001 info_ptr->max_value = ALL_64_BITS;
1002
1003 // gettimeofday is a real time clock so it skips
1004 info_ptr->may_skip_backward = true;
1005 info_ptr->may_skip_forward = true;
1006 }
1007
1008 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1009 }
1010
1011 // Return the real, user, and system times in seconds from an
1012 // arbitrary fixed point in the past.
1013 bool os::getTimesSecs(double* process_real_time,
1014 double* process_user_time,
1015 double* process_system_time) {
1016 struct tms ticks;
1017 clock_t real_ticks = times(&ticks);
1018
1019 if (real_ticks == (clock_t) (-1)) {
1020 return false;
1021 } else {
1022 double ticks_per_second = (double) clock_tics_per_sec;
1023 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1024 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1025 *process_real_time = ((double) real_ticks) / ticks_per_second;
1026
1027 return true;
1028 }
1029 }
1030
1031
1032 char * os::local_time_string(char *buf, size_t buflen) {
1033 struct tm t;
1034 time_t long_time;
1035 time(&long_time);
1036 localtime_r(&long_time, &t);
1037 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1038 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1039 t.tm_hour, t.tm_min, t.tm_sec);
1040 return buf;
1041 }
1042
1043 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1044 return localtime_r(clock, res);
1045 }
1046
1047 ////////////////////////////////////////////////////////////////////////////////
1048 // runtime exit support
1049
1050 // Note: os::shutdown() might be called very early during initialization, or
1051 // called from signal handler. Before adding something to os::shutdown(), make
1052 // sure it is async-safe and can handle partially initialized VM.
1053 void os::shutdown() {
1054
1055 // allow PerfMemory to attempt cleanup of any persistent resources
1056 perfMemory_exit();
1057
1058 // needs to remove object in file system
1059 AttachListener::abort();
1060
1061 // flush buffered output, finish log files
1062 ostream_abort();
1063
1064 // Check for abort hook
1065 abort_hook_t abort_hook = Arguments::abort_hook();
1066 if (abort_hook != NULL) {
1067 abort_hook();
1068 }
1069
1070 }
1071
1072 // Note: os::abort() might be called very early during initialization, or
1073 // called from signal handler. Before adding something to os::abort(), make
1074 // sure it is async-safe and can handle partially initialized VM.
1075 void os::abort(bool dump_core, void* siginfo, const void* context) {
1076 os::shutdown();
1077 if (dump_core) {
1078 #ifndef PRODUCT
1079 fdStream out(defaultStream::output_fd());
1080 out.print_raw("Current thread is ");
1081 char buf[16];
1082 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1083 out.print_raw_cr(buf);
1084 out.print_raw_cr("Dumping core ...");
1085 #endif
1086 ::abort(); // dump core
1087 }
1088
1089 ::exit(1);
1090 }
1091
1092 // Die immediately, no exit hook, no abort hook, no cleanup.
1093 void os::die() {
1094 // _exit() on BsdThreads only kills current thread
1095 ::abort();
1096 }
1097
1098 // This method is a copy of JDK's sysGetLastErrorString
1099 // from src/solaris/hpi/src/system_md.c
1100
1101 size_t os::lasterror(char *buf, size_t len) {
1102 if (errno == 0) return 0;
1103
1104 const char *s = os::strerror(errno);
1105 size_t n = ::strlen(s);
1106 if (n >= len) {
1107 n = len - 1;
1108 }
1109 ::strncpy(buf, s, n);
1110 buf[n] = '\0';
1111 return n;
1112 }
1113
1114 // Information of current thread in variety of formats
1115 pid_t os::Bsd::gettid() {
1116 int retval = -1;
1117
1118 #ifdef __APPLE__ //XNU kernel
1119 // despite the fact mach port is actually not a thread id use it
1120 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1121 retval = ::pthread_mach_thread_np(::pthread_self());
1122 guarantee(retval != 0, "just checking");
1123 return retval;
1124
1125 #else
1126 #ifdef __FreeBSD__
1127 retval = syscall(SYS_thr_self);
1128 #else
1129 #ifdef __OpenBSD__
1130 retval = syscall(SYS_getthrid);
1131 #else
1132 #ifdef __NetBSD__
1133 retval = (pid_t) syscall(SYS__lwp_self);
1134 #endif
1135 #endif
1136 #endif
1137 #endif
1138
1139 if (retval == -1) {
1140 return getpid();
1141 }
1142 }
1143
1144 intx os::current_thread_id() {
1145 #ifdef __APPLE__
1146 return (intx)::pthread_mach_thread_np(::pthread_self());
1147 #else
1148 return (intx)::pthread_self();
1149 #endif
1150 }
1151
1152 int os::current_process_id() {
1153
1154 // Under the old bsd thread library, bsd gives each thread
1155 // its own process id. Because of this each thread will return
1156 // a different pid if this method were to return the result
1157 // of getpid(2). Bsd provides no api that returns the pid
1158 // of the launcher thread for the vm. This implementation
1159 // returns a unique pid, the pid of the launcher thread
1160 // that starts the vm 'process'.
1161
1162 // Under the NPTL, getpid() returns the same pid as the
1163 // launcher thread rather than a unique pid per thread.
1164 // Use gettid() if you want the old pre NPTL behaviour.
1165
1166 // if you are looking for the result of a call to getpid() that
1167 // returns a unique pid for the calling thread, then look at the
1168 // OSThread::thread_id() method in osThread_bsd.hpp file
1169
1170 return (int)(_initial_pid ? _initial_pid : getpid());
1171 }
1172
1173 // DLL functions
1174
1175 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1176
1177 // This must be hard coded because it's the system's temporary
1178 // directory not the java application's temp directory, ala java.io.tmpdir.
1179 #ifdef __APPLE__
1180 // macosx has a secure per-user temporary directory
1181 char temp_path_storage[PATH_MAX];
1182 const char* os::get_temp_directory() {
1183 static char *temp_path = NULL;
1184 if (temp_path == NULL) {
1185 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1186 if (pathSize == 0 || pathSize > PATH_MAX) {
1187 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1188 }
1189 temp_path = temp_path_storage;
1190 }
1191 return temp_path;
1192 }
1193 #else // __APPLE__
1194 const char* os::get_temp_directory() { return "/tmp"; }
1195 #endif // __APPLE__
1196
1197 // check if addr is inside libjvm.so
1198 bool os::address_is_in_vm(address addr) {
1199 static address libjvm_base_addr;
1200 Dl_info dlinfo;
1201
1202 if (libjvm_base_addr == NULL) {
1203 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1204 libjvm_base_addr = (address)dlinfo.dli_fbase;
1205 }
1206 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1207 }
1208
1209 if (dladdr((void *)addr, &dlinfo) != 0) {
1210 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1211 }
1212
1213 return false;
1214 }
1215
1216
1217 #define MACH_MAXSYMLEN 256
1218
1219 bool os::dll_address_to_function_name(address addr, char *buf,
1220 int buflen, int *offset,
1221 bool demangle) {
1222 // buf is not optional, but offset is optional
1223 assert(buf != NULL, "sanity check");
1224
1225 Dl_info dlinfo;
1226 char localbuf[MACH_MAXSYMLEN];
1227
1228 if (dladdr((void*)addr, &dlinfo) != 0) {
1229 // see if we have a matching symbol
1230 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1231 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1232 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1233 }
1234 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1235 return true;
1236 }
1237 // no matching symbol so try for just file info
1238 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1239 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1240 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1241 return true;
1242 }
1243 }
1244
1245 // Handle non-dynamic manually:
1246 if (dlinfo.dli_fbase != NULL &&
1247 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1248 dlinfo.dli_fbase)) {
1249 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1250 jio_snprintf(buf, buflen, "%s", localbuf);
1251 }
1252 return true;
1253 }
1254 }
1255 buf[0] = '\0';
1256 if (offset != NULL) *offset = -1;
1257 return false;
1258 }
1259
1260 // ported from solaris version
1261 bool os::dll_address_to_library_name(address addr, char* buf,
1262 int buflen, int* offset) {
1263 // buf is not optional, but offset is optional
1264 assert(buf != NULL, "sanity check");
1265
1266 Dl_info dlinfo;
1267
1268 if (dladdr((void*)addr, &dlinfo) != 0) {
1269 if (dlinfo.dli_fname != NULL) {
1270 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1271 }
1272 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1273 *offset = addr - (address)dlinfo.dli_fbase;
1274 }
1275 return true;
1276 }
1277
1278 buf[0] = '\0';
1279 if (offset) *offset = -1;
1280 return false;
1281 }
1282
1283 // Loads .dll/.so and
1284 // in case of error it checks if .dll/.so was built for the
1285 // same architecture as Hotspot is running on
1286
1287 #ifdef __APPLE__
1288 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1289 #ifdef STATIC_BUILD
1290 return os::get_default_process_handle();
1291 #else
1292 void * result= ::dlopen(filename, RTLD_LAZY);
1293 if (result != NULL) {
1294 // Successful loading
1295 return result;
1296 }
1297
1298 // Read system error message into ebuf
1299 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1300 ebuf[ebuflen-1]='\0';
1301
1302 return NULL;
1303 #endif // STATIC_BUILD
1304 }
1305 #else
1306 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1307 #ifdef STATIC_BUILD
1308 return os::get_default_process_handle();
1309 #else
1310 void * result= ::dlopen(filename, RTLD_LAZY);
1311 if (result != NULL) {
1312 // Successful loading
1313 return result;
1314 }
1315
1316 Elf32_Ehdr elf_head;
1317
1318 // Read system error message into ebuf
1319 // It may or may not be overwritten below
1320 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1321 ebuf[ebuflen-1]='\0';
1322 int diag_msg_max_length=ebuflen-strlen(ebuf);
1323 char* diag_msg_buf=ebuf+strlen(ebuf);
1324
1325 if (diag_msg_max_length==0) {
1326 // No more space in ebuf for additional diagnostics message
1327 return NULL;
1328 }
1329
1330
1331 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1332
1333 if (file_descriptor < 0) {
1334 // Can't open library, report dlerror() message
1335 return NULL;
1336 }
1337
1338 bool failed_to_read_elf_head=
1339 (sizeof(elf_head)!=
1340 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1341
1342 ::close(file_descriptor);
1343 if (failed_to_read_elf_head) {
1344 // file i/o error - report dlerror() msg
1345 return NULL;
1346 }
1347
1348 typedef struct {
1349 Elf32_Half code; // Actual value as defined in elf.h
1350 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1351 char elf_class; // 32 or 64 bit
1352 char endianess; // MSB or LSB
1353 char* name; // String representation
1354 } arch_t;
1355
1356 #ifndef EM_486
1357 #define EM_486 6 /* Intel 80486 */
1358 #endif
1359
1360 #ifndef EM_MIPS_RS3_LE
1361 #define EM_MIPS_RS3_LE 10 /* MIPS */
1362 #endif
1363
1364 #ifndef EM_PPC64
1365 #define EM_PPC64 21 /* PowerPC64 */
1366 #endif
1367
1368 #ifndef EM_S390
1369 #define EM_S390 22 /* IBM System/390 */
1370 #endif
1371
1372 #ifndef EM_IA_64
1373 #define EM_IA_64 50 /* HP/Intel IA-64 */
1374 #endif
1375
1376 #ifndef EM_X86_64
1377 #define EM_X86_64 62 /* AMD x86-64 */
1378 #endif
1379
1380 static const arch_t arch_array[]={
1381 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1382 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1383 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1384 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1385 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1386 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1387 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1388 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1389 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1390 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1391 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1392 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1393 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1394 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1395 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1396 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1397 };
1398
1399 #if (defined IA32)
1400 static Elf32_Half running_arch_code=EM_386;
1401 #elif (defined AMD64)
1402 static Elf32_Half running_arch_code=EM_X86_64;
1403 #elif (defined IA64)
1404 static Elf32_Half running_arch_code=EM_IA_64;
1405 #elif (defined __sparc) && (defined _LP64)
1406 static Elf32_Half running_arch_code=EM_SPARCV9;
1407 #elif (defined __sparc) && (!defined _LP64)
1408 static Elf32_Half running_arch_code=EM_SPARC;
1409 #elif (defined __powerpc64__)
1410 static Elf32_Half running_arch_code=EM_PPC64;
1411 #elif (defined __powerpc__)
1412 static Elf32_Half running_arch_code=EM_PPC;
1413 #elif (defined ARM)
1414 static Elf32_Half running_arch_code=EM_ARM;
1415 #elif (defined S390)
1416 static Elf32_Half running_arch_code=EM_S390;
1417 #elif (defined ALPHA)
1418 static Elf32_Half running_arch_code=EM_ALPHA;
1419 #elif (defined MIPSEL)
1420 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1421 #elif (defined PARISC)
1422 static Elf32_Half running_arch_code=EM_PARISC;
1423 #elif (defined MIPS)
1424 static Elf32_Half running_arch_code=EM_MIPS;
1425 #elif (defined M68K)
1426 static Elf32_Half running_arch_code=EM_68K;
1427 #else
1428 #error Method os::dll_load requires that one of following is defined:\
1429 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1430 #endif
1431
1432 // Identify compatability class for VM's architecture and library's architecture
1433 // Obtain string descriptions for architectures
1434
1435 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1436 int running_arch_index=-1;
1437
1438 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1439 if (running_arch_code == arch_array[i].code) {
1440 running_arch_index = i;
1441 }
1442 if (lib_arch.code == arch_array[i].code) {
1443 lib_arch.compat_class = arch_array[i].compat_class;
1444 lib_arch.name = arch_array[i].name;
1445 }
1446 }
1447
1448 assert(running_arch_index != -1,
1449 "Didn't find running architecture code (running_arch_code) in arch_array");
1450 if (running_arch_index == -1) {
1451 // Even though running architecture detection failed
1452 // we may still continue with reporting dlerror() message
1453 return NULL;
1454 }
1455
1456 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1457 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1458 return NULL;
1459 }
1460
1461 #ifndef S390
1462 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1463 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1464 return NULL;
1465 }
1466 #endif // !S390
1467
1468 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1469 if (lib_arch.name!=NULL) {
1470 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1471 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1472 lib_arch.name, arch_array[running_arch_index].name);
1473 } else {
1474 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1475 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1476 lib_arch.code,
1477 arch_array[running_arch_index].name);
1478 }
1479 }
1480
1481 return NULL;
1482 #endif // STATIC_BUILD
1483 }
1484 #endif // !__APPLE__
1485
1486 void* os::get_default_process_handle() {
1487 #ifdef __APPLE__
1488 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1489 // to avoid finding unexpected symbols on second (or later)
1490 // loads of a library.
1491 return (void*)::dlopen(NULL, RTLD_FIRST);
1492 #else
1493 return (void*)::dlopen(NULL, RTLD_LAZY);
1494 #endif
1495 }
1496
1497 // XXX: Do we need a lock around this as per Linux?
1498 void* os::dll_lookup(void* handle, const char* name) {
1499 return dlsym(handle, name);
1500 }
1501
1502 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1503 outputStream * out = (outputStream *) param;
1504 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1505 return 0;
1506 }
1507
1508 void os::print_dll_info(outputStream *st) {
1509 st->print_cr("Dynamic libraries:");
1510 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1511 st->print_cr("Error: Cannot print dynamic libraries.");
1512 }
1513 }
1514
1515 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1516 #ifdef RTLD_DI_LINKMAP
1517 Dl_info dli;
1518 void *handle;
1519 Link_map *map;
1520 Link_map *p;
1521
1522 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1523 dli.dli_fname == NULL) {
1524 return 1;
1525 }
1526 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1527 if (handle == NULL) {
1528 return 1;
1529 }
1530 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1531 if (map == NULL) {
1532 dlclose(handle);
1533 return 1;
1534 }
1535
1536 while (map->l_prev != NULL)
1537 map = map->l_prev;
1538
1539 while (map != NULL) {
1540 // Value for top_address is returned as 0 since we don't have any information about module size
1541 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1542 dlclose(handle);
1543 return 1;
1544 }
1545 map = map->l_next;
1546 }
1547
1548 dlclose(handle);
1549 #elif defined(__APPLE__)
1550 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1551 // Value for top_address is returned as 0 since we don't have any information about module size
1552 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1553 return 1;
1554 }
1555 }
1556 return 0;
1557 #else
1558 return 1;
1559 #endif
1560 }
1561
1562 void os::get_summary_os_info(char* buf, size_t buflen) {
1563 // These buffers are small because we want this to be brief
1564 // and not use a lot of stack while generating the hs_err file.
1565 char os[100];
1566 size_t size = sizeof(os);
1567 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1568 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1569 #ifdef __APPLE__
1570 strncpy(os, "Darwin", sizeof(os));
1571 #elif __OpenBSD__
1572 strncpy(os, "OpenBSD", sizeof(os));
1573 #else
1574 strncpy(os, "BSD", sizeof(os));
1575 #endif
1576 }
1577
1578 char release[100];
1579 size = sizeof(release);
1580 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1581 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1582 // if error, leave blank
1583 strncpy(release, "", sizeof(release));
1584 }
1585 snprintf(buf, buflen, "%s %s", os, release);
1586 }
1587
1588 void os::print_os_info_brief(outputStream* st) {
1589 os::Posix::print_uname_info(st);
1590 }
1591
1592 void os::print_os_info(outputStream* st) {
1593 st->print("OS:");
1594
1595 os::Posix::print_uname_info(st);
1596
1597 os::Posix::print_rlimit_info(st);
1598
1599 os::Posix::print_load_average(st);
1600 }
1601
1602 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1603 // Nothing to do for now.
1604 }
1605
1606 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1607 unsigned int mhz;
1608 size_t size = sizeof(mhz);
1609 int mib[] = { CTL_HW, HW_CPU_FREQ };
1610 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1611 mhz = 1; // looks like an error but can be divided by
1612 } else {
1613 mhz /= 1000000; // reported in millions
1614 }
1615
1616 char model[100];
1617 size = sizeof(model);
1618 int mib_model[] = { CTL_HW, HW_MODEL };
1619 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1620 strncpy(model, cpu_arch, sizeof(model));
1621 }
1622
1623 char machine[100];
1624 size = sizeof(machine);
1625 int mib_machine[] = { CTL_HW, HW_MACHINE };
1626 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1627 strncpy(machine, "", sizeof(machine));
1628 }
1629
1630 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1631 }
1632
1633 void os::print_memory_info(outputStream* st) {
1634
1635 st->print("Memory:");
1636 st->print(" %dk page", os::vm_page_size()>>10);
1637
1638 st->print(", physical " UINT64_FORMAT "k",
1639 os::physical_memory() >> 10);
1640 st->print("(" UINT64_FORMAT "k free)",
1641 os::available_memory() >> 10);
1642 st->cr();
1643 }
1644
1645 static void print_signal_handler(outputStream* st, int sig,
1646 char* buf, size_t buflen);
1647
1648 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1649 st->print_cr("Signal Handlers:");
1650 print_signal_handler(st, SIGSEGV, buf, buflen);
1651 print_signal_handler(st, SIGBUS , buf, buflen);
1652 print_signal_handler(st, SIGFPE , buf, buflen);
1653 print_signal_handler(st, SIGPIPE, buf, buflen);
1654 print_signal_handler(st, SIGXFSZ, buf, buflen);
1655 print_signal_handler(st, SIGILL , buf, buflen);
1656 print_signal_handler(st, SR_signum, buf, buflen);
1657 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1658 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1659 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1660 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1661 }
1662
1663 static char saved_jvm_path[MAXPATHLEN] = {0};
1664
1665 // Find the full path to the current module, libjvm
1666 void os::jvm_path(char *buf, jint buflen) {
1667 // Error checking.
1668 if (buflen < MAXPATHLEN) {
1669 assert(false, "must use a large-enough buffer");
1670 buf[0] = '\0';
1671 return;
1672 }
1673 // Lazy resolve the path to current module.
1674 if (saved_jvm_path[0] != 0) {
1675 strcpy(buf, saved_jvm_path);
1676 return;
1677 }
1678
1679 char dli_fname[MAXPATHLEN];
1680 bool ret = dll_address_to_library_name(
1681 CAST_FROM_FN_PTR(address, os::jvm_path),
1682 dli_fname, sizeof(dli_fname), NULL);
1683 assert(ret, "cannot locate libjvm");
1684 char *rp = NULL;
1685 if (ret && dli_fname[0] != '\0') {
1686 rp = os::Posix::realpath(dli_fname, buf, buflen);
1687 }
1688 if (rp == NULL) {
1689 return;
1690 }
1691
1692 if (Arguments::sun_java_launcher_is_altjvm()) {
1693 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1694 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1695 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1696 // appears at the right place in the string, then assume we are
1697 // installed in a JDK and we're done. Otherwise, check for a
1698 // JAVA_HOME environment variable and construct a path to the JVM
1699 // being overridden.
1700
1701 const char *p = buf + strlen(buf) - 1;
1702 for (int count = 0; p > buf && count < 5; ++count) {
1703 for (--p; p > buf && *p != '/'; --p)
1704 /* empty */ ;
1705 }
1706
1707 if (strncmp(p, "/jre/lib/", 9) != 0) {
1708 // Look for JAVA_HOME in the environment.
1709 char* java_home_var = ::getenv("JAVA_HOME");
1710 if (java_home_var != NULL && java_home_var[0] != 0) {
1711 char* jrelib_p;
1712 int len;
1713
1714 // Check the current module name "libjvm"
1715 p = strrchr(buf, '/');
1716 assert(strstr(p, "/libjvm") == p, "invalid library name");
1717
1718 rp = os::Posix::realpath(java_home_var, buf, buflen);
1719 if (rp == NULL) {
1720 return;
1721 }
1722
1723 // determine if this is a legacy image or modules image
1724 // modules image doesn't have "jre" subdirectory
1725 len = strlen(buf);
1726 assert(len < buflen, "Ran out of buffer space");
1727 jrelib_p = buf + len;
1728
1729 // Add the appropriate library subdir
1730 snprintf(jrelib_p, buflen-len, "/jre/lib");
1731 if (0 != access(buf, F_OK)) {
1732 snprintf(jrelib_p, buflen-len, "/lib");
1733 }
1734
1735 // Add the appropriate client or server subdir
1736 len = strlen(buf);
1737 jrelib_p = buf + len;
1738 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1739 if (0 != access(buf, F_OK)) {
1740 snprintf(jrelib_p, buflen-len, "%s", "");
1741 }
1742
1743 // If the path exists within JAVA_HOME, add the JVM library name
1744 // to complete the path to JVM being overridden. Otherwise fallback
1745 // to the path to the current library.
1746 if (0 == access(buf, F_OK)) {
1747 // Use current module name "libjvm"
1748 len = strlen(buf);
1749 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1750 } else {
1751 // Fall back to path of current library
1752 rp = os::Posix::realpath(dli_fname, buf, buflen);
1753 if (rp == NULL) {
1754 return;
1755 }
1756 }
1757 }
1758 }
1759 }
1760
1761 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1762 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1763 }
1764
1765 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1766 // no prefix required, not even "_"
1767 }
1768
1769 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1770 // no suffix required
1771 }
1772
1773 ////////////////////////////////////////////////////////////////////////////////
1774 // sun.misc.Signal support
1775
1776 static volatile jint sigint_count = 0;
1777
1778 static void UserHandler(int sig, void *siginfo, void *context) {
1779 // 4511530 - sem_post is serialized and handled by the manager thread. When
1780 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1781 // don't want to flood the manager thread with sem_post requests.
1782 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1783 return;
1784 }
1785
1786 // Ctrl-C is pressed during error reporting, likely because the error
1787 // handler fails to abort. Let VM die immediately.
1788 if (sig == SIGINT && VMError::is_error_reported()) {
1789 os::die();
1790 }
1791
1792 os::signal_notify(sig);
1793 }
1794
1795 void* os::user_handler() {
1796 return CAST_FROM_FN_PTR(void*, UserHandler);
1797 }
1798
1799 extern "C" {
1800 typedef void (*sa_handler_t)(int);
1801 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1802 }
1803
1804 void* os::signal(int signal_number, void* handler) {
1805 struct sigaction sigAct, oldSigAct;
1806
1807 sigfillset(&(sigAct.sa_mask));
1808 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1809 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1810
1811 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1812 // -1 means registration failed
1813 return (void *)-1;
1814 }
1815
1816 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1817 }
1818
1819 void os::signal_raise(int signal_number) {
1820 ::raise(signal_number);
1821 }
1822
1823 // The following code is moved from os.cpp for making this
1824 // code platform specific, which it is by its very nature.
1825
1826 // Will be modified when max signal is changed to be dynamic
1827 int os::sigexitnum_pd() {
1828 return NSIG;
1829 }
1830
1831 // a counter for each possible signal value
1832 static volatile jint pending_signals[NSIG+1] = { 0 };
1833
1834 // Bsd(POSIX) specific hand shaking semaphore.
1835 #ifdef __APPLE__
1836 typedef semaphore_t os_semaphore_t;
1837
1838 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
1839 #define SEM_WAIT(sem) semaphore_wait(sem)
1840 #define SEM_POST(sem) semaphore_signal(sem)
1841 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem)
1842 #else
1843 typedef sem_t os_semaphore_t;
1844
1845 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
1846 #define SEM_WAIT(sem) sem_wait(&sem)
1847 #define SEM_POST(sem) sem_post(&sem)
1848 #define SEM_DESTROY(sem) sem_destroy(&sem)
1849 #endif
1850
1851 #ifdef __APPLE__
1852 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
1853
1854 static const char* sem_init_strerror(kern_return_t value) {
1855 switch (value) {
1856 case KERN_INVALID_ARGUMENT: return "Invalid argument";
1857 case KERN_RESOURCE_SHORTAGE: return "Resource shortage";
1858 default: return "Unknown";
1859 }
1860 }
1861
1862 OSXSemaphore::OSXSemaphore(uint value) {
1863 kern_return_t ret = SEM_INIT(_semaphore, value);
1864
1865 guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret));
1866 }
1867
1868 OSXSemaphore::~OSXSemaphore() {
1869 SEM_DESTROY(_semaphore);
1870 }
1871
1872 void OSXSemaphore::signal(uint count) {
1873 for (uint i = 0; i < count; i++) {
1874 kern_return_t ret = SEM_POST(_semaphore);
1875
1876 assert(ret == KERN_SUCCESS, "Failed to signal semaphore");
1877 }
1878 }
1879
1880 void OSXSemaphore::wait() {
1881 kern_return_t ret;
1882 while ((ret = SEM_WAIT(_semaphore)) == KERN_ABORTED) {
1883 // Semaphore was interrupted. Retry.
1884 }
1885 assert(ret == KERN_SUCCESS, "Failed to wait on semaphore");
1886 }
1887
1888 jlong OSXSemaphore::currenttime() {
1889 struct timeval tv;
1890 gettimeofday(&tv, NULL);
1891 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000);
1892 }
1893
1894 bool OSXSemaphore::trywait() {
1895 return timedwait(0, 0);
1896 }
1897
1898 bool OSXSemaphore::timedwait(unsigned int sec, int nsec) {
1899 kern_return_t kr = KERN_ABORTED;
1900 mach_timespec_t waitspec;
1901 waitspec.tv_sec = sec;
1902 waitspec.tv_nsec = nsec;
1903
1904 jlong starttime = currenttime();
1905
1906 kr = semaphore_timedwait(_semaphore, waitspec);
1907 while (kr == KERN_ABORTED) {
1908 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec;
1909
1910 jlong current = currenttime();
1911 jlong passedtime = current - starttime;
1912
1913 if (passedtime >= totalwait) {
1914 waitspec.tv_sec = 0;
1915 waitspec.tv_nsec = 0;
1916 } else {
1917 jlong waittime = totalwait - (current - starttime);
1918 waitspec.tv_sec = waittime / NANOSECS_PER_SEC;
1919 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC;
1920 }
1921
1922 kr = semaphore_timedwait(_semaphore, waitspec);
1923 }
1924
1925 return kr == KERN_SUCCESS;
1926 }
1927
1928 #else
1929 // Use POSIX implementation of semaphores.
1930
1931 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
1932 struct timespec ts;
1933 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
1934
1935 return ts;
1936 }
1937
1938 #endif // __APPLE__
1939
1940 static os_semaphore_t sig_sem;
1941
1942 #ifdef __APPLE__
1943 static OSXSemaphore sr_semaphore;
1944 #else
1945 static PosixSemaphore sr_semaphore;
1946 #endif
1947
1948 void os::signal_init_pd() {
1949 // Initialize signal structures
1950 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1951
1952 // Initialize signal semaphore
1953 ::SEM_INIT(sig_sem, 0);
1954 }
1955
1956 void os::signal_notify(int sig) {
1957 Atomic::inc(&pending_signals[sig]);
1958 ::SEM_POST(sig_sem);
1959 }
1960
1961 static int check_pending_signals(bool wait) {
1962 Atomic::store(0, &sigint_count);
1963 for (;;) {
1964 for (int i = 0; i < NSIG + 1; i++) {
1965 jint n = pending_signals[i];
1966 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1967 return i;
1968 }
1969 }
1970 if (!wait) {
1971 return -1;
1972 }
1973 JavaThread *thread = JavaThread::current();
1974 ThreadBlockInVM tbivm(thread);
1975
1976 bool threadIsSuspended;
1977 do {
1978 thread->set_suspend_equivalent();
1979 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1980 ::SEM_WAIT(sig_sem);
1981
1982 // were we externally suspended while we were waiting?
1983 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1984 if (threadIsSuspended) {
1985 // The semaphore has been incremented, but while we were waiting
1986 // another thread suspended us. We don't want to continue running
1987 // while suspended because that would surprise the thread that
1988 // suspended us.
1989 ::SEM_POST(sig_sem);
1990
1991 thread->java_suspend_self();
1992 }
1993 } while (threadIsSuspended);
1994 }
1995 }
1996
1997 int os::signal_lookup() {
1998 return check_pending_signals(false);
1999 }
2000
2001 int os::signal_wait() {
2002 return check_pending_signals(true);
2003 }
2004
2005 ////////////////////////////////////////////////////////////////////////////////
2006 // Virtual Memory
2007
2008 int os::vm_page_size() {
2009 // Seems redundant as all get out
2010 assert(os::Bsd::page_size() != -1, "must call os::init");
2011 return os::Bsd::page_size();
2012 }
2013
2014 // Solaris allocates memory by pages.
2015 int os::vm_allocation_granularity() {
2016 assert(os::Bsd::page_size() != -1, "must call os::init");
2017 return os::Bsd::page_size();
2018 }
2019
2020 // Rationale behind this function:
2021 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2022 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2023 // samples for JITted code. Here we create private executable mapping over the code cache
2024 // and then we can use standard (well, almost, as mapping can change) way to provide
2025 // info for the reporting script by storing timestamp and location of symbol
2026 void bsd_wrap_code(char* base, size_t size) {
2027 static volatile jint cnt = 0;
2028
2029 if (!UseOprofile) {
2030 return;
2031 }
2032
2033 char buf[PATH_MAX + 1];
2034 int num = Atomic::add(1, &cnt);
2035
2036 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2037 os::get_temp_directory(), os::current_process_id(), num);
2038 unlink(buf);
2039
2040 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2041
2042 if (fd != -1) {
2043 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2044 if (rv != (off_t)-1) {
2045 if (::write(fd, "", 1) == 1) {
2046 mmap(base, size,
2047 PROT_READ|PROT_WRITE|PROT_EXEC,
2048 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2049 }
2050 }
2051 ::close(fd);
2052 unlink(buf);
2053 }
2054 }
2055
2056 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2057 int err) {
2058 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
2059 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
2060 os::errno_name(err), err);
2061 }
2062
2063 // NOTE: Bsd kernel does not really reserve the pages for us.
2064 // All it does is to check if there are enough free pages
2065 // left at the time of mmap(). This could be a potential
2066 // problem.
2067 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2068 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2069 #ifdef __OpenBSD__
2070 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2071 if (::mprotect(addr, size, prot) == 0) {
2072 return true;
2073 }
2074 #else
2075 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2076 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2077 if (res != (uintptr_t) MAP_FAILED) {
2078 return true;
2079 }
2080 #endif
2081
2082 // Warn about any commit errors we see in non-product builds just
2083 // in case mmap() doesn't work as described on the man page.
2084 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2085
2086 return false;
2087 }
2088
2089 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2090 bool exec) {
2091 // alignment_hint is ignored on this OS
2092 return pd_commit_memory(addr, size, exec);
2093 }
2094
2095 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2096 const char* mesg) {
2097 assert(mesg != NULL, "mesg must be specified");
2098 if (!pd_commit_memory(addr, size, exec)) {
2099 // add extra info in product mode for vm_exit_out_of_memory():
2100 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2101 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2102 }
2103 }
2104
2105 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2106 size_t alignment_hint, bool exec,
2107 const char* mesg) {
2108 // alignment_hint is ignored on this OS
2109 pd_commit_memory_or_exit(addr, size, exec, mesg);
2110 }
2111
2112 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2113 }
2114
2115 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2116 ::madvise(addr, bytes, MADV_DONTNEED);
2117 }
2118
2119 void os::numa_make_global(char *addr, size_t bytes) {
2120 }
2121
2122 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2123 }
2124
2125 bool os::numa_topology_changed() { return false; }
2126
2127 size_t os::numa_get_groups_num() {
2128 return 1;
2129 }
2130
2131 int os::numa_get_group_id() {
2132 return 0;
2133 }
2134
2135 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2136 if (size > 0) {
2137 ids[0] = 0;
2138 return 1;
2139 }
2140 return 0;
2141 }
2142
2143 bool os::get_page_info(char *start, page_info* info) {
2144 return false;
2145 }
2146
2147 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2148 return end;
2149 }
2150
2151
2152 bool os::pd_uncommit_memory(char* addr, size_t size) {
2153 #ifdef __OpenBSD__
2154 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2155 return ::mprotect(addr, size, PROT_NONE) == 0;
2156 #else
2157 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2158 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2159 return res != (uintptr_t) MAP_FAILED;
2160 #endif
2161 }
2162
2163 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2164 return os::commit_memory(addr, size, !ExecMem);
2165 }
2166
2167 // If this is a growable mapping, remove the guard pages entirely by
2168 // munmap()ping them. If not, just call uncommit_memory().
2169 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2170 return os::uncommit_memory(addr, size);
2171 }
2172
2173 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2174 // at 'requested_addr'. If there are existing memory mappings at the same
2175 // location, however, they will be overwritten. If 'fixed' is false,
2176 // 'requested_addr' is only treated as a hint, the return value may or
2177 // may not start from the requested address. Unlike Bsd mmap(), this
2178 // function returns NULL to indicate failure.
2179 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2180 char * addr;
2181 int flags;
2182
2183 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2184 if (fixed) {
2185 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2186 flags |= MAP_FIXED;
2187 }
2188
2189 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2190 // touch an uncommitted page. Otherwise, the read/write might
2191 // succeed if we have enough swap space to back the physical page.
2192 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2193 flags, -1, 0);
2194
2195 return addr == MAP_FAILED ? NULL : addr;
2196 }
2197
2198 static int anon_munmap(char * addr, size_t size) {
2199 return ::munmap(addr, size) == 0;
2200 }
2201
2202 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2203 size_t alignment_hint) {
2204 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2205 }
2206
2207 bool os::pd_release_memory(char* addr, size_t size) {
2208 return anon_munmap(addr, size);
2209 }
2210
2211 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2212 // Bsd wants the mprotect address argument to be page aligned.
2213 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2214
2215 // According to SUSv3, mprotect() should only be used with mappings
2216 // established by mmap(), and mmap() always maps whole pages. Unaligned
2217 // 'addr' likely indicates problem in the VM (e.g. trying to change
2218 // protection of malloc'ed or statically allocated memory). Check the
2219 // caller if you hit this assert.
2220 assert(addr == bottom, "sanity check");
2221
2222 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2223 return ::mprotect(bottom, size, prot) == 0;
2224 }
2225
2226 // Set protections specified
2227 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2228 bool is_committed) {
2229 unsigned int p = 0;
2230 switch (prot) {
2231 case MEM_PROT_NONE: p = PROT_NONE; break;
2232 case MEM_PROT_READ: p = PROT_READ; break;
2233 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2234 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2235 default:
2236 ShouldNotReachHere();
2237 }
2238 // is_committed is unused.
2239 return bsd_mprotect(addr, bytes, p);
2240 }
2241
2242 bool os::guard_memory(char* addr, size_t size) {
2243 return bsd_mprotect(addr, size, PROT_NONE);
2244 }
2245
2246 bool os::unguard_memory(char* addr, size_t size) {
2247 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2248 }
2249
2250 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2251 return false;
2252 }
2253
2254 // Large page support
2255
2256 static size_t _large_page_size = 0;
2257
2258 void os::large_page_init() {
2259 }
2260
2261
2262 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2263 fatal("This code is not used or maintained.");
2264
2265 // "exec" is passed in but not used. Creating the shared image for
2266 // the code cache doesn't have an SHM_X executable permission to check.
2267 assert(UseLargePages && UseSHM, "only for SHM large pages");
2268
2269 key_t key = IPC_PRIVATE;
2270 char *addr;
2271
2272 bool warn_on_failure = UseLargePages &&
2273 (!FLAG_IS_DEFAULT(UseLargePages) ||
2274 !FLAG_IS_DEFAULT(LargePageSizeInBytes));
2275
2276 // Create a large shared memory region to attach to based on size.
2277 // Currently, size is the total size of the heap
2278 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
2279 if (shmid == -1) {
2280 // Possible reasons for shmget failure:
2281 // 1. shmmax is too small for Java heap.
2282 // > check shmmax value: cat /proc/sys/kernel/shmmax
2283 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
2284 // 2. not enough large page memory.
2285 // > check available large pages: cat /proc/meminfo
2286 // > increase amount of large pages:
2287 // echo new_value > /proc/sys/vm/nr_hugepages
2288 // Note 1: different Bsd may use different name for this property,
2289 // e.g. on Redhat AS-3 it is "hugetlb_pool".
2290 // Note 2: it's possible there's enough physical memory available but
2291 // they are so fragmented after a long run that they can't
2292 // coalesce into large pages. Try to reserve large pages when
2293 // the system is still "fresh".
2294 if (warn_on_failure) {
2295 warning("Failed to reserve shared memory (errno = %d).", errno);
2296 }
2297 return NULL;
2298 }
2299
2300 // attach to the region
2301 addr = (char*)shmat(shmid, req_addr, 0);
2302 int err = errno;
2303
2304 // Remove shmid. If shmat() is successful, the actual shared memory segment
2305 // will be deleted when it's detached by shmdt() or when the process
2306 // terminates. If shmat() is not successful this will remove the shared
2307 // segment immediately.
2308 shmctl(shmid, IPC_RMID, NULL);
2309
2310 if ((intptr_t)addr == -1) {
2311 if (warn_on_failure) {
2312 warning("Failed to attach shared memory (errno = %d).", err);
2313 }
2314 return NULL;
2315 }
2316
2317 // The memory is committed
2318 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC);
2319
2320 return addr;
2321 }
2322
2323 bool os::release_memory_special(char* base, size_t bytes) {
2324 if (MemTracker::tracking_level() > NMT_minimal) {
2325 Tracker tkr = MemTracker::get_virtual_memory_release_tracker();
2326 // detaching the SHM segment will also delete it, see reserve_memory_special()
2327 int rslt = shmdt(base);
2328 if (rslt == 0) {
2329 tkr.record((address)base, bytes);
2330 return true;
2331 } else {
2332 return false;
2333 }
2334 } else {
2335 return shmdt(base) == 0;
2336 }
2337 }
2338
2339 size_t os::large_page_size() {
2340 return _large_page_size;
2341 }
2342
2343 // HugeTLBFS allows application to commit large page memory on demand;
2344 // with SysV SHM the entire memory region must be allocated as shared
2345 // memory.
2346 bool os::can_commit_large_page_memory() {
2347 return UseHugeTLBFS;
2348 }
2349
2350 bool os::can_execute_large_page_memory() {
2351 return UseHugeTLBFS;
2352 }
2353
2354 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2355 assert(file_desc >= 0, "file_desc is not valid");
2356 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2357 if (result != NULL) {
2358 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2359 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2360 }
2361 }
2362 return result;
2363 }
2364
2365 // Reserve memory at an arbitrary address, only if that area is
2366 // available (and not reserved for something else).
2367
2368 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2369 const int max_tries = 10;
2370 char* base[max_tries];
2371 size_t size[max_tries];
2372 const size_t gap = 0x000000;
2373
2374 // Assert only that the size is a multiple of the page size, since
2375 // that's all that mmap requires, and since that's all we really know
2376 // about at this low abstraction level. If we need higher alignment,
2377 // we can either pass an alignment to this method or verify alignment
2378 // in one of the methods further up the call chain. See bug 5044738.
2379 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2380
2381 // Repeatedly allocate blocks until the block is allocated at the
2382 // right spot.
2383
2384 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2385 // if kernel honors the hint then we can return immediately.
2386 char * addr = anon_mmap(requested_addr, bytes, false);
2387 if (addr == requested_addr) {
2388 return requested_addr;
2389 }
2390
2391 if (addr != NULL) {
2392 // mmap() is successful but it fails to reserve at the requested address
2393 anon_munmap(addr, bytes);
2394 }
2395
2396 int i;
2397 for (i = 0; i < max_tries; ++i) {
2398 base[i] = reserve_memory(bytes);
2399
2400 if (base[i] != NULL) {
2401 // Is this the block we wanted?
2402 if (base[i] == requested_addr) {
2403 size[i] = bytes;
2404 break;
2405 }
2406
2407 // Does this overlap the block we wanted? Give back the overlapped
2408 // parts and try again.
2409
2410 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2411 if (top_overlap >= 0 && top_overlap < bytes) {
2412 unmap_memory(base[i], top_overlap);
2413 base[i] += top_overlap;
2414 size[i] = bytes - top_overlap;
2415 } else {
2416 size_t bottom_overlap = base[i] + bytes - requested_addr;
2417 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2418 unmap_memory(requested_addr, bottom_overlap);
2419 size[i] = bytes - bottom_overlap;
2420 } else {
2421 size[i] = bytes;
2422 }
2423 }
2424 }
2425 }
2426
2427 // Give back the unused reserved pieces.
2428
2429 for (int j = 0; j < i; ++j) {
2430 if (base[j] != NULL) {
2431 unmap_memory(base[j], size[j]);
2432 }
2433 }
2434
2435 if (i < max_tries) {
2436 return requested_addr;
2437 } else {
2438 return NULL;
2439 }
2440 }
2441
2442 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2443 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2444 }
2445
2446 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2447 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2448 }
2449
2450 void os::naked_short_sleep(jlong ms) {
2451 struct timespec req;
2452
2453 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2454 req.tv_sec = 0;
2455 if (ms > 0) {
2456 req.tv_nsec = (ms % 1000) * 1000000;
2457 } else {
2458 req.tv_nsec = 1;
2459 }
2460
2461 nanosleep(&req, NULL);
2462
2463 return;
2464 }
2465
2466 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2467 void os::infinite_sleep() {
2468 while (true) { // sleep forever ...
2469 ::sleep(100); // ... 100 seconds at a time
2470 }
2471 }
2472
2473 // Used to convert frequent JVM_Yield() to nops
2474 bool os::dont_yield() {
2475 return DontYieldALot;
2476 }
2477
2478 void os::naked_yield() {
2479 sched_yield();
2480 }
2481
2482 ////////////////////////////////////////////////////////////////////////////////
2483 // thread priority support
2484
2485 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2486 // only supports dynamic priority, static priority must be zero. For real-time
2487 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2488 // However, for large multi-threaded applications, SCHED_RR is not only slower
2489 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2490 // of 5 runs - Sep 2005).
2491 //
2492 // The following code actually changes the niceness of kernel-thread/LWP. It
2493 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2494 // not the entire user process, and user level threads are 1:1 mapped to kernel
2495 // threads. It has always been the case, but could change in the future. For
2496 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2497 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
2498
2499 #if !defined(__APPLE__)
2500 int os::java_to_os_priority[CriticalPriority + 1] = {
2501 19, // 0 Entry should never be used
2502
2503 0, // 1 MinPriority
2504 3, // 2
2505 6, // 3
2506
2507 10, // 4
2508 15, // 5 NormPriority
2509 18, // 6
2510
2511 21, // 7
2512 25, // 8
2513 28, // 9 NearMaxPriority
2514
2515 31, // 10 MaxPriority
2516
2517 31 // 11 CriticalPriority
2518 };
2519 #else
2520 // Using Mach high-level priority assignments
2521 int os::java_to_os_priority[CriticalPriority + 1] = {
2522 0, // 0 Entry should never be used (MINPRI_USER)
2523
2524 27, // 1 MinPriority
2525 28, // 2
2526 29, // 3
2527
2528 30, // 4
2529 31, // 5 NormPriority (BASEPRI_DEFAULT)
2530 32, // 6
2531
2532 33, // 7
2533 34, // 8
2534 35, // 9 NearMaxPriority
2535
2536 36, // 10 MaxPriority
2537
2538 36 // 11 CriticalPriority
2539 };
2540 #endif
2541
2542 static int prio_init() {
2543 if (ThreadPriorityPolicy == 1) {
2544 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
2545 // if effective uid is not root. Perhaps, a more elegant way of doing
2546 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
2547 if (geteuid() != 0) {
2548 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2549 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
2550 }
2551 ThreadPriorityPolicy = 0;
2552 }
2553 }
2554 if (UseCriticalJavaThreadPriority) {
2555 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2556 }
2557 return 0;
2558 }
2559
2560 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2561 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2562
2563 #ifdef __OpenBSD__
2564 // OpenBSD pthread_setprio starves low priority threads
2565 return OS_OK;
2566 #elif defined(__FreeBSD__)
2567 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2568 #elif defined(__APPLE__) || defined(__NetBSD__)
2569 struct sched_param sp;
2570 int policy;
2571 pthread_t self = pthread_self();
2572
2573 if (pthread_getschedparam(self, &policy, &sp) != 0) {
2574 return OS_ERR;
2575 }
2576
2577 sp.sched_priority = newpri;
2578 if (pthread_setschedparam(self, policy, &sp) != 0) {
2579 return OS_ERR;
2580 }
2581
2582 return OS_OK;
2583 #else
2584 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2585 return (ret == 0) ? OS_OK : OS_ERR;
2586 #endif
2587 }
2588
2589 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2590 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2591 *priority_ptr = java_to_os_priority[NormPriority];
2592 return OS_OK;
2593 }
2594
2595 errno = 0;
2596 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2597 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2598 #elif defined(__APPLE__) || defined(__NetBSD__)
2599 int policy;
2600 struct sched_param sp;
2601
2602 pthread_getschedparam(pthread_self(), &policy, &sp);
2603 *priority_ptr = sp.sched_priority;
2604 #else
2605 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2606 #endif
2607 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2608 }
2609
2610 // Hint to the underlying OS that a task switch would not be good.
2611 // Void return because it's a hint and can fail.
2612 void os::hint_no_preempt() {}
2613
2614 ////////////////////////////////////////////////////////////////////////////////
2615 // suspend/resume support
2616
2617 // The low-level signal-based suspend/resume support is a remnant from the
2618 // old VM-suspension that used to be for java-suspension, safepoints etc,
2619 // within hotspot. Currently used by JFR's OSThreadSampler
2620 //
2621 // The remaining code is greatly simplified from the more general suspension
2622 // code that used to be used.
2623 //
2624 // The protocol is quite simple:
2625 // - suspend:
2626 // - sends a signal to the target thread
2627 // - polls the suspend state of the osthread using a yield loop
2628 // - target thread signal handler (SR_handler) sets suspend state
2629 // and blocks in sigsuspend until continued
2630 // - resume:
2631 // - sets target osthread state to continue
2632 // - sends signal to end the sigsuspend loop in the SR_handler
2633 //
2634 // Note that the SR_lock plays no role in this suspend/resume protocol,
2635 // but is checked for NULL in SR_handler as a thread termination indicator.
2636 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2637 //
2638 // Note that resume_clear_context() and suspend_save_context() are needed
2639 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2640 // which in part is used by:
2641 // - Forte Analyzer: AsyncGetCallTrace()
2642 // - StackBanging: get_frame_at_stack_banging_point()
2643
2644 static void resume_clear_context(OSThread *osthread) {
2645 osthread->set_ucontext(NULL);
2646 osthread->set_siginfo(NULL);
2647 }
2648
2649 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2650 osthread->set_ucontext(context);
2651 osthread->set_siginfo(siginfo);
2652 }
2653
2654 // Handler function invoked when a thread's execution is suspended or
2655 // resumed. We have to be careful that only async-safe functions are
2656 // called here (Note: most pthread functions are not async safe and
2657 // should be avoided.)
2658 //
2659 // Note: sigwait() is a more natural fit than sigsuspend() from an
2660 // interface point of view, but sigwait() prevents the signal hander
2661 // from being run. libpthread would get very confused by not having
2662 // its signal handlers run and prevents sigwait()'s use with the
2663 // mutex granting granting signal.
2664 //
2665 // Currently only ever called on the VMThread or JavaThread
2666 //
2667 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2668 // Save and restore errno to avoid confusing native code with EINTR
2669 // after sigsuspend.
2670 int old_errno = errno;
2671
2672 Thread* thread = Thread::current_or_null_safe();
2673 assert(thread != NULL, "Missing current thread in SR_handler");
2674
2675 // On some systems we have seen signal delivery get "stuck" until the signal
2676 // mask is changed as part of thread termination. Check that the current thread
2677 // has not already terminated (via SR_lock()) - else the following assertion
2678 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2679 // destructor has completed.
2680
2681 if (thread->SR_lock() == NULL) {
2682 return;
2683 }
2684
2685 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2686
2687 OSThread* osthread = thread->osthread();
2688
2689 os::SuspendResume::State current = osthread->sr.state();
2690 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2691 suspend_save_context(osthread, siginfo, context);
2692
2693 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2694 os::SuspendResume::State state = osthread->sr.suspended();
2695 if (state == os::SuspendResume::SR_SUSPENDED) {
2696 sigset_t suspend_set; // signals for sigsuspend()
2697
2698 // get current set of blocked signals and unblock resume signal
2699 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2700 sigdelset(&suspend_set, SR_signum);
2701
2702 sr_semaphore.signal();
2703 // wait here until we are resumed
2704 while (1) {
2705 sigsuspend(&suspend_set);
2706
2707 os::SuspendResume::State result = osthread->sr.running();
2708 if (result == os::SuspendResume::SR_RUNNING) {
2709 sr_semaphore.signal();
2710 break;
2711 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2712 ShouldNotReachHere();
2713 }
2714 }
2715
2716 } else if (state == os::SuspendResume::SR_RUNNING) {
2717 // request was cancelled, continue
2718 } else {
2719 ShouldNotReachHere();
2720 }
2721
2722 resume_clear_context(osthread);
2723 } else if (current == os::SuspendResume::SR_RUNNING) {
2724 // request was cancelled, continue
2725 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2726 // ignore
2727 } else {
2728 // ignore
2729 }
2730
2731 errno = old_errno;
2732 }
2733
2734
2735 static int SR_initialize() {
2736 struct sigaction act;
2737 char *s;
2738 // Get signal number to use for suspend/resume
2739 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2740 int sig = ::strtol(s, 0, 10);
2741 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2742 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2743 SR_signum = sig;
2744 } else {
2745 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2746 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2747 }
2748 }
2749
2750 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2751 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2752
2753 sigemptyset(&SR_sigset);
2754 sigaddset(&SR_sigset, SR_signum);
2755
2756 // Set up signal handler for suspend/resume
2757 act.sa_flags = SA_RESTART|SA_SIGINFO;
2758 act.sa_handler = (void (*)(int)) SR_handler;
2759
2760 // SR_signum is blocked by default.
2761 // 4528190 - We also need to block pthread restart signal (32 on all
2762 // supported Bsd platforms). Note that BsdThreads need to block
2763 // this signal for all threads to work properly. So we don't have
2764 // to use hard-coded signal number when setting up the mask.
2765 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2766
2767 if (sigaction(SR_signum, &act, 0) == -1) {
2768 return -1;
2769 }
2770
2771 // Save signal flag
2772 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2773 return 0;
2774 }
2775
2776 static int sr_notify(OSThread* osthread) {
2777 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2778 assert_status(status == 0, status, "pthread_kill");
2779 return status;
2780 }
2781
2782 // "Randomly" selected value for how long we want to spin
2783 // before bailing out on suspending a thread, also how often
2784 // we send a signal to a thread we want to resume
2785 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2786 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2787
2788 // returns true on success and false on error - really an error is fatal
2789 // but this seems the normal response to library errors
2790 static bool do_suspend(OSThread* osthread) {
2791 assert(osthread->sr.is_running(), "thread should be running");
2792 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2793
2794 // mark as suspended and send signal
2795 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2796 // failed to switch, state wasn't running?
2797 ShouldNotReachHere();
2798 return false;
2799 }
2800
2801 if (sr_notify(osthread) != 0) {
2802 ShouldNotReachHere();
2803 }
2804
2805 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2806 while (true) {
2807 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2808 break;
2809 } else {
2810 // timeout
2811 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2812 if (cancelled == os::SuspendResume::SR_RUNNING) {
2813 return false;
2814 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2815 // make sure that we consume the signal on the semaphore as well
2816 sr_semaphore.wait();
2817 break;
2818 } else {
2819 ShouldNotReachHere();
2820 return false;
2821 }
2822 }
2823 }
2824
2825 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2826 return true;
2827 }
2828
2829 static void do_resume(OSThread* osthread) {
2830 assert(osthread->sr.is_suspended(), "thread should be suspended");
2831 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2832
2833 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2834 // failed to switch to WAKEUP_REQUEST
2835 ShouldNotReachHere();
2836 return;
2837 }
2838
2839 while (true) {
2840 if (sr_notify(osthread) == 0) {
2841 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
2842 if (osthread->sr.is_running()) {
2843 return;
2844 }
2845 }
2846 } else {
2847 ShouldNotReachHere();
2848 }
2849 }
2850
2851 guarantee(osthread->sr.is_running(), "Must be running!");
2852 }
2853
2854 ///////////////////////////////////////////////////////////////////////////////////
2855 // signal handling (except suspend/resume)
2856
2857 // This routine may be used by user applications as a "hook" to catch signals.
2858 // The user-defined signal handler must pass unrecognized signals to this
2859 // routine, and if it returns true (non-zero), then the signal handler must
2860 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2861 // routine will never retun false (zero), but instead will execute a VM panic
2862 // routine kill the process.
2863 //
2864 // If this routine returns false, it is OK to call it again. This allows
2865 // the user-defined signal handler to perform checks either before or after
2866 // the VM performs its own checks. Naturally, the user code would be making
2867 // a serious error if it tried to handle an exception (such as a null check
2868 // or breakpoint) that the VM was generating for its own correct operation.
2869 //
2870 // This routine may recognize any of the following kinds of signals:
2871 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2872 // It should be consulted by handlers for any of those signals.
2873 //
2874 // The caller of this routine must pass in the three arguments supplied
2875 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2876 // field of the structure passed to sigaction(). This routine assumes that
2877 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2878 //
2879 // Note that the VM will print warnings if it detects conflicting signal
2880 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2881 //
2882 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2883 void* ucontext,
2884 int abort_if_unrecognized);
2885
2886 void signalHandler(int sig, siginfo_t* info, void* uc) {
2887 assert(info != NULL && uc != NULL, "it must be old kernel");
2888 int orig_errno = errno; // Preserve errno value over signal handler.
2889 JVM_handle_bsd_signal(sig, info, uc, true);
2890 errno = orig_errno;
2891 }
2892
2893
2894 // This boolean allows users to forward their own non-matching signals
2895 // to JVM_handle_bsd_signal, harmlessly.
2896 bool os::Bsd::signal_handlers_are_installed = false;
2897
2898 // For signal-chaining
2899 struct sigaction sigact[NSIG];
2900 uint32_t sigs = 0;
2901 #if (32 < NSIG-1)
2902 #error "Not all signals can be encoded in sigs. Adapt its type!"
2903 #endif
2904 bool os::Bsd::libjsig_is_loaded = false;
2905 typedef struct sigaction *(*get_signal_t)(int);
2906 get_signal_t os::Bsd::get_signal_action = NULL;
2907
2908 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2909 struct sigaction *actp = NULL;
2910
2911 if (libjsig_is_loaded) {
2912 // Retrieve the old signal handler from libjsig
2913 actp = (*get_signal_action)(sig);
2914 }
2915 if (actp == NULL) {
2916 // Retrieve the preinstalled signal handler from jvm
2917 actp = get_preinstalled_handler(sig);
2918 }
2919
2920 return actp;
2921 }
2922
2923 static bool call_chained_handler(struct sigaction *actp, int sig,
2924 siginfo_t *siginfo, void *context) {
2925 // Call the old signal handler
2926 if (actp->sa_handler == SIG_DFL) {
2927 // It's more reasonable to let jvm treat it as an unexpected exception
2928 // instead of taking the default action.
2929 return false;
2930 } else if (actp->sa_handler != SIG_IGN) {
2931 if ((actp->sa_flags & SA_NODEFER) == 0) {
2932 // automaticlly block the signal
2933 sigaddset(&(actp->sa_mask), sig);
2934 }
2935
2936 sa_handler_t hand;
2937 sa_sigaction_t sa;
2938 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2939 // retrieve the chained handler
2940 if (siginfo_flag_set) {
2941 sa = actp->sa_sigaction;
2942 } else {
2943 hand = actp->sa_handler;
2944 }
2945
2946 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2947 actp->sa_handler = SIG_DFL;
2948 }
2949
2950 // try to honor the signal mask
2951 sigset_t oset;
2952 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2953
2954 // call into the chained handler
2955 if (siginfo_flag_set) {
2956 (*sa)(sig, siginfo, context);
2957 } else {
2958 (*hand)(sig);
2959 }
2960
2961 // restore the signal mask
2962 pthread_sigmask(SIG_SETMASK, &oset, 0);
2963 }
2964 // Tell jvm's signal handler the signal is taken care of.
2965 return true;
2966 }
2967
2968 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2969 bool chained = false;
2970 // signal-chaining
2971 if (UseSignalChaining) {
2972 struct sigaction *actp = get_chained_signal_action(sig);
2973 if (actp != NULL) {
2974 chained = call_chained_handler(actp, sig, siginfo, context);
2975 }
2976 }
2977 return chained;
2978 }
2979
2980 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
2981 if ((((uint32_t)1 << (sig-1)) & sigs) != 0) {
2982 return &sigact[sig];
2983 }
2984 return NULL;
2985 }
2986
2987 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
2988 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2989 sigact[sig] = oldAct;
2990 sigs |= (uint32_t)1 << (sig-1);
2991 }
2992
2993 // for diagnostic
2994 int sigflags[NSIG];
2995
2996 int os::Bsd::get_our_sigflags(int sig) {
2997 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2998 return sigflags[sig];
2999 }
3000
3001 void os::Bsd::set_our_sigflags(int sig, int flags) {
3002 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3003 if (sig > 0 && sig < NSIG) {
3004 sigflags[sig] = flags;
3005 }
3006 }
3007
3008 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
3009 // Check for overwrite.
3010 struct sigaction oldAct;
3011 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3012
3013 void* oldhand = oldAct.sa_sigaction
3014 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3015 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3016 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3017 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3018 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
3019 if (AllowUserSignalHandlers || !set_installed) {
3020 // Do not overwrite; user takes responsibility to forward to us.
3021 return;
3022 } else if (UseSignalChaining) {
3023 // save the old handler in jvm
3024 save_preinstalled_handler(sig, oldAct);
3025 // libjsig also interposes the sigaction() call below and saves the
3026 // old sigaction on it own.
3027 } else {
3028 fatal("Encountered unexpected pre-existing sigaction handler "
3029 "%#lx for signal %d.", (long)oldhand, sig);
3030 }
3031 }
3032
3033 struct sigaction sigAct;
3034 sigfillset(&(sigAct.sa_mask));
3035 sigAct.sa_handler = SIG_DFL;
3036 if (!set_installed) {
3037 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3038 } else {
3039 sigAct.sa_sigaction = signalHandler;
3040 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3041 }
3042 #ifdef __APPLE__
3043 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3044 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3045 // if the signal handler declares it will handle it on alternate stack.
3046 // Notice we only declare we will handle it on alt stack, but we are not
3047 // actually going to use real alt stack - this is just a workaround.
3048 // Please see ux_exception.c, method catch_mach_exception_raise for details
3049 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3050 if (sig == SIGSEGV) {
3051 sigAct.sa_flags |= SA_ONSTACK;
3052 }
3053 #endif
3054
3055 // Save flags, which are set by ours
3056 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3057 sigflags[sig] = sigAct.sa_flags;
3058
3059 int ret = sigaction(sig, &sigAct, &oldAct);
3060 assert(ret == 0, "check");
3061
3062 void* oldhand2 = oldAct.sa_sigaction
3063 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3064 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3065 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3066 }
3067
3068 // install signal handlers for signals that HotSpot needs to
3069 // handle in order to support Java-level exception handling.
3070
3071 void os::Bsd::install_signal_handlers() {
3072 if (!signal_handlers_are_installed) {
3073 signal_handlers_are_installed = true;
3074
3075 // signal-chaining
3076 typedef void (*signal_setting_t)();
3077 signal_setting_t begin_signal_setting = NULL;
3078 signal_setting_t end_signal_setting = NULL;
3079 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3080 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3081 if (begin_signal_setting != NULL) {
3082 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3083 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3084 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3085 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3086 libjsig_is_loaded = true;
3087 assert(UseSignalChaining, "should enable signal-chaining");
3088 }
3089 if (libjsig_is_loaded) {
3090 // Tell libjsig jvm is setting signal handlers
3091 (*begin_signal_setting)();
3092 }
3093
3094 set_signal_handler(SIGSEGV, true);
3095 set_signal_handler(SIGPIPE, true);
3096 set_signal_handler(SIGBUS, true);
3097 set_signal_handler(SIGILL, true);
3098 set_signal_handler(SIGFPE, true);
3099 set_signal_handler(SIGXFSZ, true);
3100
3101 #if defined(__APPLE__)
3102 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3103 // signals caught and handled by the JVM. To work around this, we reset the mach task
3104 // signal handler that's placed on our process by CrashReporter. This disables
3105 // CrashReporter-based reporting.
3106 //
3107 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3108 // on caught fatal signals.
3109 //
3110 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3111 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3112 // exception handling, while leaving the standard BSD signal handlers functional.
3113 kern_return_t kr;
3114 kr = task_set_exception_ports(mach_task_self(),
3115 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3116 MACH_PORT_NULL,
3117 EXCEPTION_STATE_IDENTITY,
3118 MACHINE_THREAD_STATE);
3119
3120 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3121 #endif
3122
3123 if (libjsig_is_loaded) {
3124 // Tell libjsig jvm finishes setting signal handlers
3125 (*end_signal_setting)();
3126 }
3127
3128 // We don't activate signal checker if libjsig is in place, we trust ourselves
3129 // and if UserSignalHandler is installed all bets are off
3130 if (CheckJNICalls) {
3131 if (libjsig_is_loaded) {
3132 if (PrintJNIResolving) {
3133 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3134 }
3135 check_signals = false;
3136 }
3137 if (AllowUserSignalHandlers) {
3138 if (PrintJNIResolving) {
3139 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3140 }
3141 check_signals = false;
3142 }
3143 }
3144 }
3145 }
3146
3147
3148 /////
3149 // glibc on Bsd platform uses non-documented flag
3150 // to indicate, that some special sort of signal
3151 // trampoline is used.
3152 // We will never set this flag, and we should
3153 // ignore this flag in our diagnostic
3154 #ifdef SIGNIFICANT_SIGNAL_MASK
3155 #undef SIGNIFICANT_SIGNAL_MASK
3156 #endif
3157 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3158
3159 static const char* get_signal_handler_name(address handler,
3160 char* buf, int buflen) {
3161 int offset;
3162 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3163 if (found) {
3164 // skip directory names
3165 const char *p1, *p2;
3166 p1 = buf;
3167 size_t len = strlen(os::file_separator());
3168 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3169 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3170 } else {
3171 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3172 }
3173 return buf;
3174 }
3175
3176 static void print_signal_handler(outputStream* st, int sig,
3177 char* buf, size_t buflen) {
3178 struct sigaction sa;
3179
3180 sigaction(sig, NULL, &sa);
3181
3182 // See comment for SIGNIFICANT_SIGNAL_MASK define
3183 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3184
3185 st->print("%s: ", os::exception_name(sig, buf, buflen));
3186
3187 address handler = (sa.sa_flags & SA_SIGINFO)
3188 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3189 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3190
3191 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3192 st->print("SIG_DFL");
3193 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3194 st->print("SIG_IGN");
3195 } else {
3196 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3197 }
3198
3199 st->print(", sa_mask[0]=");
3200 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3201
3202 address rh = VMError::get_resetted_sighandler(sig);
3203 // May be, handler was resetted by VMError?
3204 if (rh != NULL) {
3205 handler = rh;
3206 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3207 }
3208
3209 st->print(", sa_flags=");
3210 os::Posix::print_sa_flags(st, sa.sa_flags);
3211
3212 // Check: is it our handler?
3213 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3214 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3215 // It is our signal handler
3216 // check for flags, reset system-used one!
3217 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3218 st->print(
3219 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3220 os::Bsd::get_our_sigflags(sig));
3221 }
3222 }
3223 st->cr();
3224 }
3225
3226
3227 #define DO_SIGNAL_CHECK(sig) \
3228 do { \
3229 if (!sigismember(&check_signal_done, sig)) { \
3230 os::Bsd::check_signal_handler(sig); \
3231 } \
3232 } while (0)
3233
3234 // This method is a periodic task to check for misbehaving JNI applications
3235 // under CheckJNI, we can add any periodic checks here
3236
3237 void os::run_periodic_checks() {
3238
3239 if (check_signals == false) return;
3240
3241 // SEGV and BUS if overridden could potentially prevent
3242 // generation of hs*.log in the event of a crash, debugging
3243 // such a case can be very challenging, so we absolutely
3244 // check the following for a good measure:
3245 DO_SIGNAL_CHECK(SIGSEGV);
3246 DO_SIGNAL_CHECK(SIGILL);
3247 DO_SIGNAL_CHECK(SIGFPE);
3248 DO_SIGNAL_CHECK(SIGBUS);
3249 DO_SIGNAL_CHECK(SIGPIPE);
3250 DO_SIGNAL_CHECK(SIGXFSZ);
3251
3252
3253 // ReduceSignalUsage allows the user to override these handlers
3254 // see comments at the very top and jvm_solaris.h
3255 if (!ReduceSignalUsage) {
3256 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3257 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3258 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3259 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3260 }
3261
3262 DO_SIGNAL_CHECK(SR_signum);
3263 }
3264
3265 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3266
3267 static os_sigaction_t os_sigaction = NULL;
3268
3269 void os::Bsd::check_signal_handler(int sig) {
3270 char buf[O_BUFLEN];
3271 address jvmHandler = NULL;
3272
3273
3274 struct sigaction act;
3275 if (os_sigaction == NULL) {
3276 // only trust the default sigaction, in case it has been interposed
3277 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3278 if (os_sigaction == NULL) return;
3279 }
3280
3281 os_sigaction(sig, (struct sigaction*)NULL, &act);
3282
3283
3284 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3285
3286 address thisHandler = (act.sa_flags & SA_SIGINFO)
3287 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3288 : CAST_FROM_FN_PTR(address, act.sa_handler);
3289
3290
3291 switch (sig) {
3292 case SIGSEGV:
3293 case SIGBUS:
3294 case SIGFPE:
3295 case SIGPIPE:
3296 case SIGILL:
3297 case SIGXFSZ:
3298 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3299 break;
3300
3301 case SHUTDOWN1_SIGNAL:
3302 case SHUTDOWN2_SIGNAL:
3303 case SHUTDOWN3_SIGNAL:
3304 case BREAK_SIGNAL:
3305 jvmHandler = (address)user_handler();
3306 break;
3307
3308 default:
3309 if (sig == SR_signum) {
3310 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3311 } else {
3312 return;
3313 }
3314 break;
3315 }
3316
3317 if (thisHandler != jvmHandler) {
3318 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3319 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3320 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3321 // No need to check this sig any longer
3322 sigaddset(&check_signal_done, sig);
3323 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3324 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3325 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3326 exception_name(sig, buf, O_BUFLEN));
3327 }
3328 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3329 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3330 tty->print("expected:");
3331 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3332 tty->cr();
3333 tty->print(" found:");
3334 os::Posix::print_sa_flags(tty, act.sa_flags);
3335 tty->cr();
3336 // No need to check this sig any longer
3337 sigaddset(&check_signal_done, sig);
3338 }
3339
3340 // Dump all the signal
3341 if (sigismember(&check_signal_done, sig)) {
3342 print_signal_handlers(tty, buf, O_BUFLEN);
3343 }
3344 }
3345
3346 extern void report_error(char* file_name, int line_no, char* title,
3347 char* format, ...);
3348
3349 // this is called _before_ the most of global arguments have been parsed
3350 void os::init(void) {
3351 char dummy; // used to get a guess on initial stack address
3352
3353 // With BsdThreads the JavaMain thread pid (primordial thread)
3354 // is different than the pid of the java launcher thread.
3355 // So, on Bsd, the launcher thread pid is passed to the VM
3356 // via the sun.java.launcher.pid property.
3357 // Use this property instead of getpid() if it was correctly passed.
3358 // See bug 6351349.
3359 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3360
3361 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3362
3363 clock_tics_per_sec = CLK_TCK;
3364
3365 init_random(1234567);
3366
3367 Bsd::set_page_size(getpagesize());
3368 if (Bsd::page_size() == -1) {
3369 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3370 }
3371 init_page_sizes((size_t) Bsd::page_size());
3372
3373 Bsd::initialize_system_info();
3374
3375 // main_thread points to the aboriginal thread
3376 Bsd::_main_thread = pthread_self();
3377
3378 Bsd::clock_init();
3379 initial_time_count = javaTimeNanos();
3380
3381 #ifdef __APPLE__
3382 // XXXDARWIN
3383 // Work around the unaligned VM callbacks in hotspot's
3384 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
3385 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
3386 // alignment when doing symbol lookup. To work around this, we force early
3387 // binding of all symbols now, thus binding when alignment is known-good.
3388 _dyld_bind_fully_image_containing_address((const void *) &os::init);
3389 #endif
3390
3391 os::Posix::init();
3392 }
3393
3394 // To install functions for atexit system call
3395 extern "C" {
3396 static void perfMemory_exit_helper() {
3397 perfMemory_exit();
3398 }
3399 }
3400
3401 // this is called _after_ the global arguments have been parsed
3402 jint os::init_2(void) {
3403
3404 os::Posix::init_2();
3405
3406 // Allocate a single page and mark it as readable for safepoint polling
3407 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3408 guarantee(polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page");
3409
3410 os::set_polling_page(polling_page);
3411 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
3412
3413 if (!UseMembar) {
3414 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3415 guarantee(mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page");
3416 os::set_memory_serialize_page(mem_serialize_page);
3417 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
3418 }
3419
3420 // initialize suspend/resume support - must do this before signal_sets_init()
3421 if (SR_initialize() != 0) {
3422 perror("SR_initialize failed");
3423 return JNI_ERR;
3424 }
3425
3426 Bsd::signal_sets_init();
3427 Bsd::install_signal_handlers();
3428
3429 // Check and sets minimum stack sizes against command line options
3430 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3431 return JNI_ERR;
3432 }
3433
3434 if (MaxFDLimit) {
3435 // set the number of file descriptors to max. print out error
3436 // if getrlimit/setrlimit fails but continue regardless.
3437 struct rlimit nbr_files;
3438 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3439 if (status != 0) {
3440 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3441 } else {
3442 nbr_files.rlim_cur = nbr_files.rlim_max;
3443
3444 #ifdef __APPLE__
3445 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3446 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3447 // be used instead
3448 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3449 #endif
3450
3451 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3452 if (status != 0) {
3453 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3454 }
3455 }
3456 }
3457
3458 // at-exit methods are called in the reverse order of their registration.
3459 // atexit functions are called on return from main or as a result of a
3460 // call to exit(3C). There can be only 32 of these functions registered
3461 // and atexit() does not set errno.
3462
3463 if (PerfAllowAtExitRegistration) {
3464 // only register atexit functions if PerfAllowAtExitRegistration is set.
3465 // atexit functions can be delayed until process exit time, which
3466 // can be problematic for embedded VM situations. Embedded VMs should
3467 // call DestroyJavaVM() to assure that VM resources are released.
3468
3469 // note: perfMemory_exit_helper atexit function may be removed in
3470 // the future if the appropriate cleanup code can be added to the
3471 // VM_Exit VMOperation's doit method.
3472 if (atexit(perfMemory_exit_helper) != 0) {
3473 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3474 }
3475 }
3476
3477 // initialize thread priority policy
3478 prio_init();
3479
3480 #ifdef __APPLE__
3481 // dynamically link to objective c gc registration
3482 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3483 if (handleLibObjc != NULL) {
3484 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3485 }
3486 #endif
3487
3488 return JNI_OK;
3489 }
3490
3491 // Mark the polling page as unreadable
3492 void os::make_polling_page_unreadable(void) {
3493 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3494 fatal("Could not disable polling page");
3495 }
3496 }
3497
3498 // Mark the polling page as readable
3499 void os::make_polling_page_readable(void) {
3500 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3501 fatal("Could not enable polling page");
3502 }
3503 }
3504
3505 int os::active_processor_count() {
3506 return _processor_count;
3507 }
3508
3509 void os::set_native_thread_name(const char *name) {
3510 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3511 // This is only supported in Snow Leopard and beyond
3512 if (name != NULL) {
3513 // Add a "Java: " prefix to the name
3514 char buf[MAXTHREADNAMESIZE];
3515 snprintf(buf, sizeof(buf), "Java: %s", name);
3516 pthread_setname_np(buf);
3517 }
3518 #endif
3519 }
3520
3521 bool os::distribute_processes(uint length, uint* distribution) {
3522 // Not yet implemented.
3523 return false;
3524 }
3525
3526 bool os::bind_to_processor(uint processor_id) {
3527 // Not yet implemented.
3528 return false;
3529 }
3530
3531 void os::SuspendedThreadTask::internal_do_task() {
3532 if (do_suspend(_thread->osthread())) {
3533 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3534 do_task(context);
3535 do_resume(_thread->osthread());
3536 }
3537 }
3538
3539 ////////////////////////////////////////////////////////////////////////////////
3540 // debug support
3541
3542 bool os::find(address addr, outputStream* st) {
3543 Dl_info dlinfo;
3544 memset(&dlinfo, 0, sizeof(dlinfo));
3545 if (dladdr(addr, &dlinfo) != 0) {
3546 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3547 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3548 st->print("%s+%#x", dlinfo.dli_sname,
3549 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3550 } else if (dlinfo.dli_fbase != NULL) {
3551 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3552 } else {
3553 st->print("<absolute address>");
3554 }
3555 if (dlinfo.dli_fname != NULL) {
3556 st->print(" in %s", dlinfo.dli_fname);
3557 }
3558 if (dlinfo.dli_fbase != NULL) {
3559 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3560 }
3561 st->cr();
3562
3563 if (Verbose) {
3564 // decode some bytes around the PC
3565 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3566 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3567 address lowest = (address) dlinfo.dli_sname;
3568 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3569 if (begin < lowest) begin = lowest;
3570 Dl_info dlinfo2;
3571 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3572 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3573 end = (address) dlinfo2.dli_saddr;
3574 }
3575 Disassembler::decode(begin, end, st);
3576 }
3577 return true;
3578 }
3579 return false;
3580 }
3581
3582 ////////////////////////////////////////////////////////////////////////////////
3583 // misc
3584
3585 // This does not do anything on Bsd. This is basically a hook for being
3586 // able to use structured exception handling (thread-local exception filters)
3587 // on, e.g., Win32.
3588 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3589 const methodHandle& method, JavaCallArguments* args,
3590 Thread* thread) {
3591 f(value, method, args, thread);
3592 }
3593
3594 void os::print_statistics() {
3595 }
3596
3597 bool os::message_box(const char* title, const char* message) {
3598 int i;
3599 fdStream err(defaultStream::error_fd());
3600 for (i = 0; i < 78; i++) err.print_raw("=");
3601 err.cr();
3602 err.print_raw_cr(title);
3603 for (i = 0; i < 78; i++) err.print_raw("-");
3604 err.cr();
3605 err.print_raw_cr(message);
3606 for (i = 0; i < 78; i++) err.print_raw("=");
3607 err.cr();
3608
3609 char buf[16];
3610 // Prevent process from exiting upon "read error" without consuming all CPU
3611 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3612
3613 return buf[0] == 'y' || buf[0] == 'Y';
3614 }
3615
3616 int os::stat(const char *path, struct stat *sbuf) {
3617 char pathbuf[MAX_PATH];
3618 if (strlen(path) > MAX_PATH - 1) {
3619 errno = ENAMETOOLONG;
3620 return -1;
3621 }
3622 os::native_path(strcpy(pathbuf, path));
3623 return ::stat(pathbuf, sbuf);
3624 }
3625
3626 static inline struct timespec get_mtime(const char* filename) {
3627 struct stat st;
3628 int ret = os::stat(filename, &st);
3629 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
3630 #ifdef __APPLE__
3631 return st.st_mtimespec;
3632 #else
3633 return st.st_mtim;
3634 #endif
3635 }
3636
3637 int os::compare_file_modified_times(const char* file1, const char* file2) {
3638 struct timespec filetime1 = get_mtime(file1);
3639 struct timespec filetime2 = get_mtime(file2);
3640 int diff = filetime1.tv_sec - filetime2.tv_sec;
3641 if (diff == 0) {
3642 return filetime1.tv_nsec - filetime2.tv_nsec;
3643 }
3644 return diff;
3645 }
3646
3647 // Is a (classpath) directory empty?
3648 bool os::dir_is_empty(const char* path) {
3649 DIR *dir = NULL;
3650 struct dirent *ptr;
3651
3652 dir = opendir(path);
3653 if (dir == NULL) return true;
3654
3655 // Scan the directory
3656 bool result = true;
3657 char buf[sizeof(struct dirent) + MAX_PATH];
3658 while (result && (ptr = ::readdir(dir)) != NULL) {
3659 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3660 result = false;
3661 }
3662 }
3663 closedir(dir);
3664 return result;
3665 }
3666
3667 // This code originates from JDK's sysOpen and open64_w
3668 // from src/solaris/hpi/src/system_md.c
3669
3670 int os::open(const char *path, int oflag, int mode) {
3671 if (strlen(path) > MAX_PATH - 1) {
3672 errno = ENAMETOOLONG;
3673 return -1;
3674 }
3675 int fd;
3676
3677 fd = ::open(path, oflag, mode);
3678 if (fd == -1) return -1;
3679
3680 // If the open succeeded, the file might still be a directory
3681 {
3682 struct stat buf;
3683 int ret = ::fstat(fd, &buf);
3684 int st_mode = buf.st_mode;
3685
3686 if (ret != -1) {
3687 if ((st_mode & S_IFMT) == S_IFDIR) {
3688 errno = EISDIR;
3689 ::close(fd);
3690 return -1;
3691 }
3692 } else {
3693 ::close(fd);
3694 return -1;
3695 }
3696 }
3697
3698 // All file descriptors that are opened in the JVM and not
3699 // specifically destined for a subprocess should have the
3700 // close-on-exec flag set. If we don't set it, then careless 3rd
3701 // party native code might fork and exec without closing all
3702 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3703 // UNIXProcess.c), and this in turn might:
3704 //
3705 // - cause end-of-file to fail to be detected on some file
3706 // descriptors, resulting in mysterious hangs, or
3707 //
3708 // - might cause an fopen in the subprocess to fail on a system
3709 // suffering from bug 1085341.
3710 //
3711 // (Yes, the default setting of the close-on-exec flag is a Unix
3712 // design flaw)
3713 //
3714 // See:
3715 // 1085341: 32-bit stdio routines should support file descriptors >255
3716 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3717 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3718 //
3719 #ifdef FD_CLOEXEC
3720 {
3721 int flags = ::fcntl(fd, F_GETFD);
3722 if (flags != -1) {
3723 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3724 }
3725 }
3726 #endif
3727
3728 return fd;
3729 }
3730
3731
3732 // create binary file, rewriting existing file if required
3733 int os::create_binary_file(const char* path, bool rewrite_existing) {
3734 int oflags = O_WRONLY | O_CREAT;
3735 if (!rewrite_existing) {
3736 oflags |= O_EXCL;
3737 }
3738 return ::open(path, oflags, S_IREAD | S_IWRITE);
3739 }
3740
3741 // return current position of file pointer
3742 jlong os::current_file_offset(int fd) {
3743 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3744 }
3745
3746 // move file pointer to the specified offset
3747 jlong os::seek_to_file_offset(int fd, jlong offset) {
3748 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3749 }
3750
3751 // This code originates from JDK's sysAvailable
3752 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3753
3754 int os::available(int fd, jlong *bytes) {
3755 jlong cur, end;
3756 int mode;
3757 struct stat buf;
3758
3759 if (::fstat(fd, &buf) >= 0) {
3760 mode = buf.st_mode;
3761 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3762 int n;
3763 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3764 *bytes = n;
3765 return 1;
3766 }
3767 }
3768 }
3769 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3770 return 0;
3771 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3772 return 0;
3773 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3774 return 0;
3775 }
3776 *bytes = end - cur;
3777 return 1;
3778 }
3779
3780 // Map a block of memory.
3781 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3782 char *addr, size_t bytes, bool read_only,
3783 bool allow_exec) {
3784 int prot;
3785 int flags;
3786
3787 if (read_only) {
3788 prot = PROT_READ;
3789 flags = MAP_SHARED;
3790 } else {
3791 prot = PROT_READ | PROT_WRITE;
3792 flags = MAP_PRIVATE;
3793 }
3794
3795 if (allow_exec) {
3796 prot |= PROT_EXEC;
3797 }
3798
3799 if (addr != NULL) {
3800 flags |= MAP_FIXED;
3801 }
3802
3803 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3804 fd, file_offset);
3805 if (mapped_address == MAP_FAILED) {
3806 return NULL;
3807 }
3808 return mapped_address;
3809 }
3810
3811
3812 // Remap a block of memory.
3813 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3814 char *addr, size_t bytes, bool read_only,
3815 bool allow_exec) {
3816 // same as map_memory() on this OS
3817 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3818 allow_exec);
3819 }
3820
3821
3822 // Unmap a block of memory.
3823 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3824 return munmap(addr, bytes) == 0;
3825 }
3826
3827 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3828 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3829 // of a thread.
3830 //
3831 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3832 // the fast estimate available on the platform.
3833
3834 jlong os::current_thread_cpu_time() {
3835 #ifdef __APPLE__
3836 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3837 #else
3838 Unimplemented();
3839 return 0;
3840 #endif
3841 }
3842
3843 jlong os::thread_cpu_time(Thread* thread) {
3844 #ifdef __APPLE__
3845 return os::thread_cpu_time(thread, true /* user + sys */);
3846 #else
3847 Unimplemented();
3848 return 0;
3849 #endif
3850 }
3851
3852 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3853 #ifdef __APPLE__
3854 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3855 #else
3856 Unimplemented();
3857 return 0;
3858 #endif
3859 }
3860
3861 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3862 #ifdef __APPLE__
3863 struct thread_basic_info tinfo;
3864 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3865 kern_return_t kr;
3866 thread_t mach_thread;
3867
3868 mach_thread = thread->osthread()->thread_id();
3869 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3870 if (kr != KERN_SUCCESS) {
3871 return -1;
3872 }
3873
3874 if (user_sys_cpu_time) {
3875 jlong nanos;
3876 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3877 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3878 return nanos;
3879 } else {
3880 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3881 }
3882 #else
3883 Unimplemented();
3884 return 0;
3885 #endif
3886 }
3887
3888
3889 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3890 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3891 info_ptr->may_skip_backward = false; // elapsed time not wall time
3892 info_ptr->may_skip_forward = false; // elapsed time not wall time
3893 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3894 }
3895
3896 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3897 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3898 info_ptr->may_skip_backward = false; // elapsed time not wall time
3899 info_ptr->may_skip_forward = false; // elapsed time not wall time
3900 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3901 }
3902
3903 bool os::is_thread_cpu_time_supported() {
3904 #ifdef __APPLE__
3905 return true;
3906 #else
3907 return false;
3908 #endif
3909 }
3910
3911 // System loadavg support. Returns -1 if load average cannot be obtained.
3912 // Bsd doesn't yet have a (official) notion of processor sets,
3913 // so just return the system wide load average.
3914 int os::loadavg(double loadavg[], int nelem) {
3915 return ::getloadavg(loadavg, nelem);
3916 }
3917
3918 void os::pause() {
3919 char filename[MAX_PATH];
3920 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3921 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3922 } else {
3923 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3924 }
3925
3926 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3927 if (fd != -1) {
3928 struct stat buf;
3929 ::close(fd);
3930 while (::stat(filename, &buf) == 0) {
3931 (void)::poll(NULL, 0, 100);
3932 }
3933 } else {
3934 jio_fprintf(stderr,
3935 "Could not open pause file '%s', continuing immediately.\n", filename);
3936 }
3937 }
3938
3939 // Darwin has no "environ" in a dynamic library.
3940 #ifdef __APPLE__
3941 #include <crt_externs.h>
3942 #define environ (*_NSGetEnviron())
3943 #else
3944 extern char** environ;
3945 #endif
3946
3947 // Run the specified command in a separate process. Return its exit value,
3948 // or -1 on failure (e.g. can't fork a new process).
3949 // Unlike system(), this function can be called from signal handler. It
3950 // doesn't block SIGINT et al.
3951 int os::fork_and_exec(char* cmd) {
3952 const char * argv[4] = {"sh", "-c", cmd, NULL};
3953
3954 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3955 // pthread_atfork handlers and reset pthread library. All we need is a
3956 // separate process to execve. Make a direct syscall to fork process.
3957 // On IA64 there's no fork syscall, we have to use fork() and hope for
3958 // the best...
3959 pid_t pid = fork();
3960
3961 if (pid < 0) {
3962 // fork failed
3963 return -1;
3964
3965 } else if (pid == 0) {
3966 // child process
3967
3968 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3969 // first to kill every thread on the thread list. Because this list is
3970 // not reset by fork() (see notes above), execve() will instead kill
3971 // every thread in the parent process. We know this is the only thread
3972 // in the new process, so make a system call directly.
3973 // IA64 should use normal execve() from glibc to match the glibc fork()
3974 // above.
3975 execve("/bin/sh", (char* const*)argv, environ);
3976
3977 // execve failed
3978 _exit(-1);
3979
3980 } else {
3981 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3982 // care about the actual exit code, for now.
3983
3984 int status;
3985
3986 // Wait for the child process to exit. This returns immediately if
3987 // the child has already exited. */
3988 while (waitpid(pid, &status, 0) < 0) {
3989 switch (errno) {
3990 case ECHILD: return 0;
3991 case EINTR: break;
3992 default: return -1;
3993 }
3994 }
3995
3996 if (WIFEXITED(status)) {
3997 // The child exited normally; get its exit code.
3998 return WEXITSTATUS(status);
3999 } else if (WIFSIGNALED(status)) {
4000 // The child exited because of a signal
4001 // The best value to return is 0x80 + signal number,
4002 // because that is what all Unix shells do, and because
4003 // it allows callers to distinguish between process exit and
4004 // process death by signal.
4005 return 0x80 + WTERMSIG(status);
4006 } else {
4007 // Unknown exit code; pass it through
4008 return status;
4009 }
4010 }
4011 }
4012
4013 // is_headless_jre()
4014 //
4015 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4016 // in order to report if we are running in a headless jre
4017 //
4018 // Since JDK8 xawt/libmawt.so was moved into the same directory
4019 // as libawt.so, and renamed libawt_xawt.so
4020 //
4021 bool os::is_headless_jre() {
4022 #ifdef __APPLE__
4023 // We no longer build headless-only on Mac OS X
4024 return false;
4025 #else
4026 struct stat statbuf;
4027 char buf[MAXPATHLEN];
4028 char libmawtpath[MAXPATHLEN];
4029 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
4030 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
4031 char *p;
4032
4033 // Get path to libjvm.so
4034 os::jvm_path(buf, sizeof(buf));
4035
4036 // Get rid of libjvm.so
4037 p = strrchr(buf, '/');
4038 if (p == NULL) {
4039 return false;
4040 } else {
4041 *p = '\0';
4042 }
4043
4044 // Get rid of client or server
4045 p = strrchr(buf, '/');
4046 if (p == NULL) {
4047 return false;
4048 } else {
4049 *p = '\0';
4050 }
4051
4052 // check xawt/libmawt.so
4053 strcpy(libmawtpath, buf);
4054 strcat(libmawtpath, xawtstr);
4055 if (::stat(libmawtpath, &statbuf) == 0) return false;
4056
4057 // check libawt_xawt.so
4058 strcpy(libmawtpath, buf);
4059 strcat(libmawtpath, new_xawtstr);
4060 if (::stat(libmawtpath, &statbuf) == 0) return false;
4061
4062 return true;
4063 #endif
4064 }
4065
4066 // Get the default path to the core file
4067 // Returns the length of the string
4068 int os::get_core_path(char* buffer, size_t bufferSize) {
4069 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
4070
4071 // Truncate if theoretical string was longer than bufferSize
4072 n = MIN2(n, (int)bufferSize);
4073
4074 return n;
4075 }
4076
4077 #ifndef PRODUCT
4078 void TestReserveMemorySpecial_test() {
4079 // No tests available for this platform
4080 }
4081 #endif
4082
4083 bool os::start_debugging(char *buf, int buflen) {
4084 int len = (int)strlen(buf);
4085 char *p = &buf[len];
4086
4087 jio_snprintf(p, buflen-len,
4088 "\n\n"
4089 "Do you want to debug the problem?\n\n"
4090 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
4091 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
4092 "Otherwise, press RETURN to abort...",
4093 os::current_process_id(), os::current_process_id(),
4094 os::current_thread_id(), os::current_thread_id());
4095
4096 bool yes = os::message_box("Unexpected Error", buf);
4097
4098 if (yes) {
4099 // yes, user asked VM to launch debugger
4100 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
4101 os::current_process_id(), os::current_process_id());
4102
4103 os::fork_and_exec(buf);
4104 yes = false;
4105 }
4106 return yes;
4107 }