Wed, 16 Nov 2011 20:38:24 -0500
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
Reviewed-by: dholmes, dsamersoff
Contributed-by: Chris Hegarty <chris.hegarty@oracle.com>
1 /*
2 * Copyright (c) 1999, 2011, 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 */
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 "interpreter/interpreter.hpp"
33 #include "jvm_bsd.h"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/filemap.hpp"
36 #include "mutex_bsd.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "os_share_bsd.hpp"
39 #include "prims/jniFastGetField.hpp"
40 #include "prims/jvm.h"
41 #include "prims/jvm_misc.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/extendedPC.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/interfaceSupport.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/mutexLocker.hpp"
49 #include "runtime/objectMonitor.hpp"
50 #include "runtime/osThread.hpp"
51 #include "runtime/perfMemory.hpp"
52 #include "runtime/sharedRuntime.hpp"
53 #include "runtime/statSampler.hpp"
54 #include "runtime/stubRoutines.hpp"
55 #include "runtime/threadCritical.hpp"
56 #include "runtime/timer.hpp"
57 #include "services/attachListener.hpp"
58 #include "services/runtimeService.hpp"
59 #include "thread_bsd.inline.hpp"
60 #include "utilities/decoder.hpp"
61 #include "utilities/defaultStream.hpp"
62 #include "utilities/events.hpp"
63 #include "utilities/growableArray.hpp"
64 #include "utilities/vmError.hpp"
65 #ifdef TARGET_ARCH_x86
66 # include "assembler_x86.inline.hpp"
67 # include "nativeInst_x86.hpp"
68 #endif
69 #ifdef TARGET_ARCH_sparc
70 # include "assembler_sparc.inline.hpp"
71 # include "nativeInst_sparc.hpp"
72 #endif
73 #ifdef TARGET_ARCH_zero
74 # include "assembler_zero.inline.hpp"
75 # include "nativeInst_zero.hpp"
76 #endif
77 #ifdef TARGET_ARCH_arm
78 # include "assembler_arm.inline.hpp"
79 # include "nativeInst_arm.hpp"
80 #endif
81 #ifdef TARGET_ARCH_ppc
82 # include "assembler_ppc.inline.hpp"
83 # include "nativeInst_ppc.hpp"
84 #endif
85 #ifdef COMPILER1
86 #include "c1/c1_Runtime1.hpp"
87 #endif
88 #ifdef COMPILER2
89 #include "opto/runtime.hpp"
90 #endif
92 // put OS-includes here
93 # include <sys/types.h>
94 # include <sys/mman.h>
95 # include <sys/stat.h>
96 # include <sys/select.h>
97 # include <pthread.h>
98 # include <signal.h>
99 # include <errno.h>
100 # include <dlfcn.h>
101 # include <stdio.h>
102 # include <unistd.h>
103 # include <sys/resource.h>
104 # include <pthread.h>
105 # include <sys/stat.h>
106 # include <sys/time.h>
107 # include <sys/times.h>
108 # include <sys/utsname.h>
109 # include <sys/socket.h>
110 # include <sys/wait.h>
111 # include <time.h>
112 # include <pwd.h>
113 # include <poll.h>
114 # include <semaphore.h>
115 # include <fcntl.h>
116 # include <string.h>
117 #ifdef _ALLBSD_SOURCE
118 # include <sys/param.h>
119 # include <sys/sysctl.h>
120 #else
121 # include <syscall.h>
122 # include <sys/sysinfo.h>
123 # include <gnu/libc-version.h>
124 #endif
125 # include <sys/ipc.h>
126 # include <sys/shm.h>
127 #ifndef __APPLE__
128 # include <link.h>
129 #endif
130 # include <stdint.h>
131 # include <inttypes.h>
132 # include <sys/ioctl.h>
134 #if defined(__FreeBSD__) || defined(__NetBSD__)
135 # include <elf.h>
136 #endif
138 #ifdef __APPLE__
139 # include <mach/mach.h> // semaphore_* API
140 # include <mach-o/dyld.h>
141 # include <sys/proc_info.h>
142 # include <objc/objc-auto.h>
143 #endif
145 #ifndef MAP_ANONYMOUS
146 #define MAP_ANONYMOUS MAP_ANON
147 #endif
149 #define MAX_PATH (2 * K)
151 // for timer info max values which include all bits
152 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
153 #define SEC_IN_NANOSECS 1000000000LL
155 #define LARGEPAGES_BIT (1 << 6)
156 ////////////////////////////////////////////////////////////////////////////////
157 // global variables
158 julong os::Bsd::_physical_memory = 0;
160 #ifndef _ALLBSD_SOURCE
161 address os::Bsd::_initial_thread_stack_bottom = NULL;
162 uintptr_t os::Bsd::_initial_thread_stack_size = 0;
163 #endif
165 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
166 #ifndef _ALLBSD_SOURCE
167 int (*os::Bsd::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL;
168 Mutex* os::Bsd::_createThread_lock = NULL;
169 #endif
170 pthread_t os::Bsd::_main_thread;
171 int os::Bsd::_page_size = -1;
172 #ifndef _ALLBSD_SOURCE
173 bool os::Bsd::_is_floating_stack = false;
174 bool os::Bsd::_is_NPTL = false;
175 bool os::Bsd::_supports_fast_thread_cpu_time = false;
176 const char * os::Bsd::_glibc_version = NULL;
177 const char * os::Bsd::_libpthread_version = NULL;
178 #endif
180 static jlong initial_time_count=0;
182 static int clock_tics_per_sec = 100;
184 // For diagnostics to print a message once. see run_periodic_checks
185 static sigset_t check_signal_done;
186 static bool check_signals = true;;
188 static pid_t _initial_pid = 0;
190 /* Signal number used to suspend/resume a thread */
192 /* do not use any signal number less than SIGSEGV, see 4355769 */
193 static int SR_signum = SIGUSR2;
194 sigset_t SR_sigset;
197 ////////////////////////////////////////////////////////////////////////////////
198 // utility functions
200 static int SR_initialize();
201 static int SR_finalize();
203 julong os::available_memory() {
204 return Bsd::available_memory();
205 }
207 julong os::Bsd::available_memory() {
208 #ifdef _ALLBSD_SOURCE
209 // XXXBSD: this is just a stopgap implementation
210 return physical_memory() >> 2;
211 #else
212 // values in struct sysinfo are "unsigned long"
213 struct sysinfo si;
214 sysinfo(&si);
216 return (julong)si.freeram * si.mem_unit;
217 #endif
218 }
220 julong os::physical_memory() {
221 return Bsd::physical_memory();
222 }
224 julong os::allocatable_physical_memory(julong size) {
225 #ifdef _LP64
226 return size;
227 #else
228 julong result = MIN2(size, (julong)3800*M);
229 if (!is_allocatable(result)) {
230 // See comments under solaris for alignment considerations
231 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size();
232 result = MIN2(size, reasonable_size);
233 }
234 return result;
235 #endif // _LP64
236 }
238 ////////////////////////////////////////////////////////////////////////////////
239 // environment support
241 bool os::getenv(const char* name, char* buf, int len) {
242 const char* val = ::getenv(name);
243 if (val != NULL && strlen(val) < (size_t)len) {
244 strcpy(buf, val);
245 return true;
246 }
247 if (len > 0) buf[0] = 0; // return a null string
248 return false;
249 }
252 // Return true if user is running as root.
254 bool os::have_special_privileges() {
255 static bool init = false;
256 static bool privileges = false;
257 if (!init) {
258 privileges = (getuid() != geteuid()) || (getgid() != getegid());
259 init = true;
260 }
261 return privileges;
262 }
265 #ifndef _ALLBSD_SOURCE
266 #ifndef SYS_gettid
267 // i386: 224, ia64: 1105, amd64: 186, sparc 143
268 #ifdef __ia64__
269 #define SYS_gettid 1105
270 #elif __i386__
271 #define SYS_gettid 224
272 #elif __amd64__
273 #define SYS_gettid 186
274 #elif __sparc__
275 #define SYS_gettid 143
276 #else
277 #error define gettid for the arch
278 #endif
279 #endif
280 #endif
282 // Cpu architecture string
283 #if defined(ZERO)
284 static char cpu_arch[] = ZERO_LIBARCH;
285 #elif defined(IA64)
286 static char cpu_arch[] = "ia64";
287 #elif defined(IA32)
288 static char cpu_arch[] = "i386";
289 #elif defined(AMD64)
290 static char cpu_arch[] = "amd64";
291 #elif defined(ARM)
292 static char cpu_arch[] = "arm";
293 #elif defined(PPC)
294 static char cpu_arch[] = "ppc";
295 #elif defined(SPARC)
296 # ifdef _LP64
297 static char cpu_arch[] = "sparcv9";
298 # else
299 static char cpu_arch[] = "sparc";
300 # endif
301 #else
302 #error Add appropriate cpu_arch setting
303 #endif
306 #ifndef _ALLBSD_SOURCE
307 // pid_t gettid()
308 //
309 // Returns the kernel thread id of the currently running thread. Kernel
310 // thread id is used to access /proc.
311 //
312 // (Note that getpid() on BsdThreads returns kernel thread id too; but
313 // on NPTL, it returns the same pid for all threads, as required by POSIX.)
314 //
315 pid_t os::Bsd::gettid() {
316 int rslt = syscall(SYS_gettid);
317 if (rslt == -1) {
318 // old kernel, no NPTL support
319 return getpid();
320 } else {
321 return (pid_t)rslt;
322 }
323 }
325 // Most versions of bsd have a bug where the number of processors are
326 // determined by looking at the /proc file system. In a chroot environment,
327 // the system call returns 1. This causes the VM to act as if it is
328 // a single processor and elide locking (see is_MP() call).
329 static bool unsafe_chroot_detected = false;
330 static const char *unstable_chroot_error = "/proc file system not found.\n"
331 "Java may be unstable running multithreaded in a chroot "
332 "environment on Bsd when /proc filesystem is not mounted.";
333 #endif
335 #ifdef _ALLBSD_SOURCE
336 void os::Bsd::initialize_system_info() {
337 int mib[2];
338 size_t len;
339 int cpu_val;
340 u_long mem_val;
342 /* get processors count via hw.ncpus sysctl */
343 mib[0] = CTL_HW;
344 mib[1] = HW_NCPU;
345 len = sizeof(cpu_val);
346 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
347 set_processor_count(cpu_val);
348 }
349 else {
350 set_processor_count(1); // fallback
351 }
353 /* get physical memory via hw.usermem sysctl (hw.usermem is used
354 * instead of hw.physmem because we need size of allocatable memory
355 */
356 mib[0] = CTL_HW;
357 mib[1] = HW_USERMEM;
358 len = sizeof(mem_val);
359 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1)
360 _physical_memory = mem_val;
361 else
362 _physical_memory = 256*1024*1024; // fallback (XXXBSD?)
364 #ifdef __OpenBSD__
365 {
366 // limit _physical_memory memory view on OpenBSD since
367 // datasize rlimit restricts us anyway.
368 struct rlimit limits;
369 getrlimit(RLIMIT_DATA, &limits);
370 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
371 }
372 #endif
373 }
374 #else
375 void os::Bsd::initialize_system_info() {
376 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
377 if (processor_count() == 1) {
378 pid_t pid = os::Bsd::gettid();
379 char fname[32];
380 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid);
381 FILE *fp = fopen(fname, "r");
382 if (fp == NULL) {
383 unsafe_chroot_detected = true;
384 } else {
385 fclose(fp);
386 }
387 }
388 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
389 assert(processor_count() > 0, "bsd error");
390 }
391 #endif
393 #ifdef __APPLE__
394 static const char *get_home() {
395 const char *home_dir = ::getenv("HOME");
396 if ((home_dir == NULL) || (*home_dir == '\0')) {
397 struct passwd *passwd_info = getpwuid(geteuid());
398 if (passwd_info != NULL) {
399 home_dir = passwd_info->pw_dir;
400 }
401 }
403 return home_dir;
404 }
405 #endif
407 void os::init_system_properties_values() {
408 // char arch[12];
409 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
411 // The next steps are taken in the product version:
412 //
413 // Obtain the JAVA_HOME value from the location of libjvm[_g].so.
414 // This library should be located at:
415 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so.
416 //
417 // If "/jre/lib/" appears at the right place in the path, then we
418 // assume libjvm[_g].so is installed in a JDK and we use this path.
419 //
420 // Otherwise exit with message: "Could not create the Java virtual machine."
421 //
422 // The following extra steps are taken in the debugging version:
423 //
424 // If "/jre/lib/" does NOT appear at the right place in the path
425 // instead of exit check for $JAVA_HOME environment variable.
426 //
427 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
428 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so
429 // it looks like libjvm[_g].so is installed there
430 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so.
431 //
432 // Otherwise exit.
433 //
434 // Important note: if the location of libjvm.so changes this
435 // code needs to be changed accordingly.
437 // The next few definitions allow the code to be verbatim:
438 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n))
439 #define getenv(n) ::getenv(n)
441 /*
442 * See ld(1):
443 * The linker uses the following search paths to locate required
444 * shared libraries:
445 * 1: ...
446 * ...
447 * 7: The default directories, normally /lib and /usr/lib.
448 */
449 #ifndef DEFAULT_LIBPATH
450 #define DEFAULT_LIBPATH "/lib:/usr/lib"
451 #endif
453 #define EXTENSIONS_DIR "/lib/ext"
454 #define ENDORSED_DIR "/lib/endorsed"
455 #define REG_DIR "/usr/java/packages"
457 #ifdef __APPLE__
458 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
459 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
460 const char *user_home_dir = get_home();
461 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir
462 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
463 sizeof(SYS_EXTENSIONS_DIRS);
464 #endif
466 {
467 /* sysclasspath, java_home, dll_dir */
468 {
469 char *home_path;
470 char *dll_path;
471 char *pslash;
472 char buf[MAXPATHLEN];
473 os::jvm_path(buf, sizeof(buf));
475 // Found the full path to libjvm.so.
476 // Now cut the path to <java_home>/jre if we can.
477 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
478 pslash = strrchr(buf, '/');
479 if (pslash != NULL)
480 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
481 dll_path = malloc(strlen(buf) + 1);
482 if (dll_path == NULL)
483 return;
484 strcpy(dll_path, buf);
485 Arguments::set_dll_dir(dll_path);
487 if (pslash != NULL) {
488 pslash = strrchr(buf, '/');
489 if (pslash != NULL) {
490 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */
491 #ifndef __APPLE__
492 pslash = strrchr(buf, '/');
493 if (pslash != NULL)
494 *pslash = '\0'; /* get rid of /lib */
495 #endif
496 }
497 }
499 home_path = malloc(strlen(buf) + 1);
500 if (home_path == NULL)
501 return;
502 strcpy(home_path, buf);
503 Arguments::set_java_home(home_path);
505 if (!set_boot_path('/', ':'))
506 return;
507 }
509 /*
510 * Where to look for native libraries
511 *
512 * Note: Due to a legacy implementation, most of the library path
513 * is set in the launcher. This was to accomodate linking restrictions
514 * on legacy Bsd implementations (which are no longer supported).
515 * Eventually, all the library path setting will be done here.
516 *
517 * However, to prevent the proliferation of improperly built native
518 * libraries, the new path component /usr/java/packages is added here.
519 * Eventually, all the library path setting will be done here.
520 */
521 {
522 char *ld_library_path;
524 /*
525 * Construct the invariant part of ld_library_path. Note that the
526 * space for the colon and the trailing null are provided by the
527 * nulls included by the sizeof operator (so actually we allocate
528 * a byte more than necessary).
529 */
530 #ifdef __APPLE__
531 ld_library_path = (char *) malloc(system_ext_size);
532 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);
533 #else
534 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
535 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
536 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
537 #endif
539 /*
540 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It
541 * should always exist (until the legacy problem cited above is
542 * addressed).
543 */
544 #ifdef __APPLE__
545 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper
546 char *l = getenv("JAVA_LIBRARY_PATH");
547 if (l != NULL) {
548 char *t = ld_library_path;
549 /* That's +1 for the colon and +1 for the trailing '\0' */
550 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);
551 sprintf(ld_library_path, "%s:%s", l, t);
552 free(t);
553 }
555 char *v = getenv("DYLD_LIBRARY_PATH");
556 #else
557 char *v = getenv("LD_LIBRARY_PATH");
558 #endif
559 if (v != NULL) {
560 char *t = ld_library_path;
561 /* That's +1 for the colon and +1 for the trailing '\0' */
562 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
563 sprintf(ld_library_path, "%s:%s", v, t);
564 free(t);
565 }
566 Arguments::set_library_path(ld_library_path);
567 }
569 /*
570 * Extensions directories.
571 *
572 * Note that the space for the colon and the trailing null are provided
573 * by the nulls included by the sizeof operator (so actually one byte more
574 * than necessary is allocated).
575 */
576 {
577 #ifdef __APPLE__
578 char *buf = malloc(strlen(Arguments::get_java_home()) +
579 sizeof(EXTENSIONS_DIR) + system_ext_size);
580 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"
581 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());
582 #else
583 char *buf = malloc(strlen(Arguments::get_java_home()) +
584 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
585 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
586 Arguments::get_java_home());
587 #endif
589 Arguments::set_ext_dirs(buf);
590 }
592 /* Endorsed standards default directory. */
593 {
594 char * buf;
595 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
596 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
597 Arguments::set_endorsed_dirs(buf);
598 }
599 }
601 #ifdef __APPLE__
602 #undef SYS_EXTENSIONS_DIR
603 #endif
604 #undef malloc
605 #undef getenv
606 #undef EXTENSIONS_DIR
607 #undef ENDORSED_DIR
609 // Done
610 return;
611 }
613 ////////////////////////////////////////////////////////////////////////////////
614 // breakpoint support
616 void os::breakpoint() {
617 BREAKPOINT;
618 }
620 extern "C" void breakpoint() {
621 // use debugger to set breakpoint here
622 }
624 ////////////////////////////////////////////////////////////////////////////////
625 // signal support
627 debug_only(static bool signal_sets_initialized = false);
628 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
630 bool os::Bsd::is_sig_ignored(int sig) {
631 struct sigaction oact;
632 sigaction(sig, (struct sigaction*)NULL, &oact);
633 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
634 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
635 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
636 return true;
637 else
638 return false;
639 }
641 void os::Bsd::signal_sets_init() {
642 // Should also have an assertion stating we are still single-threaded.
643 assert(!signal_sets_initialized, "Already initialized");
644 // Fill in signals that are necessarily unblocked for all threads in
645 // the VM. Currently, we unblock the following signals:
646 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
647 // by -Xrs (=ReduceSignalUsage));
648 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
649 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
650 // the dispositions or masks wrt these signals.
651 // Programs embedding the VM that want to use the above signals for their
652 // own purposes must, at this time, use the "-Xrs" option to prevent
653 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
654 // (See bug 4345157, and other related bugs).
655 // In reality, though, unblocking these signals is really a nop, since
656 // these signals are not blocked by default.
657 sigemptyset(&unblocked_sigs);
658 sigemptyset(&allowdebug_blocked_sigs);
659 sigaddset(&unblocked_sigs, SIGILL);
660 sigaddset(&unblocked_sigs, SIGSEGV);
661 sigaddset(&unblocked_sigs, SIGBUS);
662 sigaddset(&unblocked_sigs, SIGFPE);
663 sigaddset(&unblocked_sigs, SR_signum);
665 if (!ReduceSignalUsage) {
666 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
667 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
668 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
669 }
670 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
671 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
672 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
673 }
674 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
675 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
676 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
677 }
678 }
679 // Fill in signals that are blocked by all but the VM thread.
680 sigemptyset(&vm_sigs);
681 if (!ReduceSignalUsage)
682 sigaddset(&vm_sigs, BREAK_SIGNAL);
683 debug_only(signal_sets_initialized = true);
685 }
687 // These are signals that are unblocked while a thread is running Java.
688 // (For some reason, they get blocked by default.)
689 sigset_t* os::Bsd::unblocked_signals() {
690 assert(signal_sets_initialized, "Not initialized");
691 return &unblocked_sigs;
692 }
694 // These are the signals that are blocked while a (non-VM) thread is
695 // running Java. Only the VM thread handles these signals.
696 sigset_t* os::Bsd::vm_signals() {
697 assert(signal_sets_initialized, "Not initialized");
698 return &vm_sigs;
699 }
701 // These are signals that are blocked during cond_wait to allow debugger in
702 sigset_t* os::Bsd::allowdebug_blocked_signals() {
703 assert(signal_sets_initialized, "Not initialized");
704 return &allowdebug_blocked_sigs;
705 }
707 void os::Bsd::hotspot_sigmask(Thread* thread) {
709 //Save caller's signal mask before setting VM signal mask
710 sigset_t caller_sigmask;
711 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
713 OSThread* osthread = thread->osthread();
714 osthread->set_caller_sigmask(caller_sigmask);
716 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
718 if (!ReduceSignalUsage) {
719 if (thread->is_VM_thread()) {
720 // Only the VM thread handles BREAK_SIGNAL ...
721 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
722 } else {
723 // ... all other threads block BREAK_SIGNAL
724 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
725 }
726 }
727 }
729 #ifndef _ALLBSD_SOURCE
730 //////////////////////////////////////////////////////////////////////////////
731 // detecting pthread library
733 void os::Bsd::libpthread_init() {
734 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION
735 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a
736 // generic name for earlier versions.
737 // Define macros here so we can build HotSpot on old systems.
738 # ifndef _CS_GNU_LIBC_VERSION
739 # define _CS_GNU_LIBC_VERSION 2
740 # endif
741 # ifndef _CS_GNU_LIBPTHREAD_VERSION
742 # define _CS_GNU_LIBPTHREAD_VERSION 3
743 # endif
745 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0);
746 if (n > 0) {
747 char *str = (char *)malloc(n);
748 confstr(_CS_GNU_LIBC_VERSION, str, n);
749 os::Bsd::set_glibc_version(str);
750 } else {
751 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version()
752 static char _gnu_libc_version[32];
753 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version),
754 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release());
755 os::Bsd::set_glibc_version(_gnu_libc_version);
756 }
758 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0);
759 if (n > 0) {
760 char *str = (char *)malloc(n);
761 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n);
762 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells
763 // us "NPTL-0.29" even we are running with BsdThreads. Check if this
764 // is the case. BsdThreads has a hard limit on max number of threads.
765 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value.
766 // On the other hand, NPTL does not have such a limit, sysconf()
767 // will return -1 and errno is not changed. Check if it is really NPTL.
768 if (strcmp(os::Bsd::glibc_version(), "glibc 2.3.2") == 0 &&
769 strstr(str, "NPTL") &&
770 sysconf(_SC_THREAD_THREADS_MAX) > 0) {
771 free(str);
772 os::Bsd::set_libpthread_version("bsdthreads");
773 } else {
774 os::Bsd::set_libpthread_version(str);
775 }
776 } else {
777 // glibc before 2.3.2 only has BsdThreads.
778 os::Bsd::set_libpthread_version("bsdthreads");
779 }
781 if (strstr(libpthread_version(), "NPTL")) {
782 os::Bsd::set_is_NPTL();
783 } else {
784 os::Bsd::set_is_BsdThreads();
785 }
787 // BsdThreads have two flavors: floating-stack mode, which allows variable
788 // stack size; and fixed-stack mode. NPTL is always floating-stack.
789 if (os::Bsd::is_NPTL() || os::Bsd::supports_variable_stack_size()) {
790 os::Bsd::set_is_floating_stack();
791 }
792 }
794 /////////////////////////////////////////////////////////////////////////////
795 // thread stack
797 // Force Bsd kernel to expand current thread stack. If "bottom" is close
798 // to the stack guard, caller should block all signals.
799 //
800 // MAP_GROWSDOWN:
801 // A special mmap() flag that is used to implement thread stacks. It tells
802 // kernel that the memory region should extend downwards when needed. This
803 // allows early versions of BsdThreads to only mmap the first few pages
804 // when creating a new thread. Bsd kernel will automatically expand thread
805 // stack as needed (on page faults).
806 //
807 // However, because the memory region of a MAP_GROWSDOWN stack can grow on
808 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN
809 // region, it's hard to tell if the fault is due to a legitimate stack
810 // access or because of reading/writing non-exist memory (e.g. buffer
811 // overrun). As a rule, if the fault happens below current stack pointer,
812 // Bsd kernel does not expand stack, instead a SIGSEGV is sent to the
813 // application (see Bsd kernel fault.c).
814 //
815 // This Bsd feature can cause SIGSEGV when VM bangs thread stack for
816 // stack overflow detection.
817 //
818 // Newer version of BsdThreads (since glibc-2.2, or, RH-7.x) and NPTL do
819 // not use this flag. However, the stack of initial thread is not created
820 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though
821 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack
822 // and then attach the thread to JVM.
823 //
824 // To get around the problem and allow stack banging on Bsd, we need to
825 // manually expand thread stack after receiving the SIGSEGV.
826 //
827 // There are two ways to expand thread stack to address "bottom", we used
828 // both of them in JVM before 1.5:
829 // 1. adjust stack pointer first so that it is below "bottom", and then
830 // touch "bottom"
831 // 2. mmap() the page in question
832 //
833 // Now alternate signal stack is gone, it's harder to use 2. For instance,
834 // if current sp is already near the lower end of page 101, and we need to
835 // call mmap() to map page 100, it is possible that part of the mmap() frame
836 // will be placed in page 100. When page 100 is mapped, it is zero-filled.
837 // That will destroy the mmap() frame and cause VM to crash.
838 //
839 // The following code works by adjusting sp first, then accessing the "bottom"
840 // page to force a page fault. Bsd kernel will then automatically expand the
841 // stack mapping.
842 //
843 // _expand_stack_to() assumes its frame size is less than page size, which
844 // should always be true if the function is not inlined.
846 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute
847 #define NOINLINE
848 #else
849 #define NOINLINE __attribute__ ((noinline))
850 #endif
852 static void _expand_stack_to(address bottom) NOINLINE;
854 static void _expand_stack_to(address bottom) {
855 address sp;
856 size_t size;
857 volatile char *p;
859 // Adjust bottom to point to the largest address within the same page, it
860 // gives us a one-page buffer if alloca() allocates slightly more memory.
861 bottom = (address)align_size_down((uintptr_t)bottom, os::Bsd::page_size());
862 bottom += os::Bsd::page_size() - 1;
864 // sp might be slightly above current stack pointer; if that's the case, we
865 // will alloca() a little more space than necessary, which is OK. Don't use
866 // os::current_stack_pointer(), as its result can be slightly below current
867 // stack pointer, causing us to not alloca enough to reach "bottom".
868 sp = (address)&sp;
870 if (sp > bottom) {
871 size = sp - bottom;
872 p = (volatile char *)alloca(size);
873 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?");
874 p[0] = '\0';
875 }
876 }
878 bool os::Bsd::manually_expand_stack(JavaThread * t, address addr) {
879 assert(t!=NULL, "just checking");
880 assert(t->osthread()->expanding_stack(), "expand should be set");
881 assert(t->stack_base() != NULL, "stack_base was not initialized");
883 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) {
884 sigset_t mask_all, old_sigset;
885 sigfillset(&mask_all);
886 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset);
887 _expand_stack_to(addr);
888 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL);
889 return true;
890 }
891 return false;
892 }
893 #endif
895 //////////////////////////////////////////////////////////////////////////////
896 // create new thread
898 static address highest_vm_reserved_address();
900 // check if it's safe to start a new thread
901 static bool _thread_safety_check(Thread* thread) {
902 #ifdef _ALLBSD_SOURCE
903 return true;
904 #else
905 if (os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack()) {
906 // Fixed stack BsdThreads (SuSE Bsd/x86, and some versions of Redhat)
907 // Heap is mmap'ed at lower end of memory space. Thread stacks are
908 // allocated (MAP_FIXED) from high address space. Every thread stack
909 // occupies a fixed size slot (usually 2Mbytes, but user can change
910 // it to other values if they rebuild BsdThreads).
911 //
912 // Problem with MAP_FIXED is that mmap() can still succeed even part of
913 // the memory region has already been mmap'ed. That means if we have too
914 // many threads and/or very large heap, eventually thread stack will
915 // collide with heap.
916 //
917 // Here we try to prevent heap/stack collision by comparing current
918 // stack bottom with the highest address that has been mmap'ed by JVM
919 // plus a safety margin for memory maps created by native code.
920 //
921 // This feature can be disabled by setting ThreadSafetyMargin to 0
922 //
923 if (ThreadSafetyMargin > 0) {
924 address stack_bottom = os::current_stack_base() - os::current_stack_size();
926 // not safe if our stack extends below the safety margin
927 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address();
928 } else {
929 return true;
930 }
931 } else {
932 // Floating stack BsdThreads or NPTL:
933 // Unlike fixed stack BsdThreads, thread stacks are not MAP_FIXED. When
934 // there's not enough space left, pthread_create() will fail. If we come
935 // here, that means enough space has been reserved for stack.
936 return true;
937 }
938 #endif
939 }
941 #ifdef __APPLE__
942 // library handle for calling objc_registerThreadWithCollector()
943 // without static linking to the libobjc library
944 #define OBJC_LIB "/usr/lib/libobjc.dylib"
945 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
946 typedef void (*objc_registerThreadWithCollector_t)();
947 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
948 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
949 #endif
951 // Thread start routine for all newly created threads
952 static void *java_start(Thread *thread) {
953 // Try to randomize the cache line index of hot stack frames.
954 // This helps when threads of the same stack traces evict each other's
955 // cache lines. The threads can be either from the same JVM instance, or
956 // from different JVM instances. The benefit is especially true for
957 // processors with hyperthreading technology.
958 static int counter = 0;
959 int pid = os::current_process_id();
960 alloca(((pid ^ counter++) & 7) * 128);
962 ThreadLocalStorage::set_thread(thread);
964 OSThread* osthread = thread->osthread();
965 Monitor* sync = osthread->startThread_lock();
967 // non floating stack BsdThreads needs extra check, see above
968 if (!_thread_safety_check(thread)) {
969 // notify parent thread
970 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
971 osthread->set_state(ZOMBIE);
972 sync->notify_all();
973 return NULL;
974 }
976 #ifdef _ALLBSD_SOURCE
977 // thread_id is pthread_id on BSD
978 osthread->set_thread_id(::pthread_self());
979 #else
980 // thread_id is kernel thread id (similar to Solaris LWP id)
981 osthread->set_thread_id(os::Bsd::gettid());
983 if (UseNUMA) {
984 int lgrp_id = os::numa_get_group_id();
985 if (lgrp_id != -1) {
986 thread->set_lgrp_id(lgrp_id);
987 }
988 }
989 #endif
990 // initialize signal mask for this thread
991 os::Bsd::hotspot_sigmask(thread);
993 // initialize floating point control register
994 os::Bsd::init_thread_fpu_state();
996 #ifdef __APPLE__
997 // register thread with objc gc
998 if (objc_registerThreadWithCollectorFunction != NULL) {
999 objc_registerThreadWithCollectorFunction();
1000 }
1001 #endif
1003 // handshaking with parent thread
1004 {
1005 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
1007 // notify parent thread
1008 osthread->set_state(INITIALIZED);
1009 sync->notify_all();
1011 // wait until os::start_thread()
1012 while (osthread->get_state() == INITIALIZED) {
1013 sync->wait(Mutex::_no_safepoint_check_flag);
1014 }
1015 }
1017 // call one more level start routine
1018 thread->run();
1020 return 0;
1021 }
1023 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1024 assert(thread->osthread() == NULL, "caller responsible");
1026 // Allocate the OSThread object
1027 OSThread* osthread = new OSThread(NULL, NULL);
1028 if (osthread == NULL) {
1029 return false;
1030 }
1032 // set the correct thread state
1033 osthread->set_thread_type(thr_type);
1035 // Initial state is ALLOCATED but not INITIALIZED
1036 osthread->set_state(ALLOCATED);
1038 thread->set_osthread(osthread);
1040 // init thread attributes
1041 pthread_attr_t attr;
1042 pthread_attr_init(&attr);
1043 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
1045 // stack size
1046 if (os::Bsd::supports_variable_stack_size()) {
1047 // calculate stack size if it's not specified by caller
1048 if (stack_size == 0) {
1049 stack_size = os::Bsd::default_stack_size(thr_type);
1051 switch (thr_type) {
1052 case os::java_thread:
1053 // Java threads use ThreadStackSize which default value can be
1054 // changed with the flag -Xss
1055 assert (JavaThread::stack_size_at_create() > 0, "this should be set");
1056 stack_size = JavaThread::stack_size_at_create();
1057 break;
1058 case os::compiler_thread:
1059 if (CompilerThreadStackSize > 0) {
1060 stack_size = (size_t)(CompilerThreadStackSize * K);
1061 break;
1062 } // else fall through:
1063 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1064 case os::vm_thread:
1065 case os::pgc_thread:
1066 case os::cgc_thread:
1067 case os::watcher_thread:
1068 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1069 break;
1070 }
1071 }
1073 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
1074 pthread_attr_setstacksize(&attr, stack_size);
1075 } else {
1076 // let pthread_create() pick the default value.
1077 }
1079 #ifndef _ALLBSD_SOURCE
1080 // glibc guard page
1081 pthread_attr_setguardsize(&attr, os::Bsd::default_guard_size(thr_type));
1082 #endif
1084 ThreadState state;
1086 {
1088 #ifndef _ALLBSD_SOURCE
1089 // Serialize thread creation if we are running with fixed stack BsdThreads
1090 bool lock = os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack();
1091 if (lock) {
1092 os::Bsd::createThread_lock()->lock_without_safepoint_check();
1093 }
1094 #endif
1096 pthread_t tid;
1097 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
1099 pthread_attr_destroy(&attr);
1101 if (ret != 0) {
1102 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1103 perror("pthread_create()");
1104 }
1105 // Need to clean up stuff we've allocated so far
1106 thread->set_osthread(NULL);
1107 delete osthread;
1108 #ifndef _ALLBSD_SOURCE
1109 if (lock) os::Bsd::createThread_lock()->unlock();
1110 #endif
1111 return false;
1112 }
1114 // Store pthread info into the OSThread
1115 osthread->set_pthread_id(tid);
1117 // Wait until child thread is either initialized or aborted
1118 {
1119 Monitor* sync_with_child = osthread->startThread_lock();
1120 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
1121 while ((state = osthread->get_state()) == ALLOCATED) {
1122 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
1123 }
1124 }
1126 #ifndef _ALLBSD_SOURCE
1127 if (lock) {
1128 os::Bsd::createThread_lock()->unlock();
1129 }
1130 #endif
1131 }
1133 // Aborted due to thread limit being reached
1134 if (state == ZOMBIE) {
1135 thread->set_osthread(NULL);
1136 delete osthread;
1137 return false;
1138 }
1140 // The thread is returned suspended (in state INITIALIZED),
1141 // and is started higher up in the call chain
1142 assert(state == INITIALIZED, "race condition");
1143 return true;
1144 }
1146 /////////////////////////////////////////////////////////////////////////////
1147 // attach existing thread
1149 // bootstrap the main thread
1150 bool os::create_main_thread(JavaThread* thread) {
1151 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
1152 return create_attached_thread(thread);
1153 }
1155 bool os::create_attached_thread(JavaThread* thread) {
1156 #ifdef ASSERT
1157 thread->verify_not_published();
1158 #endif
1160 // Allocate the OSThread object
1161 OSThread* osthread = new OSThread(NULL, NULL);
1163 if (osthread == NULL) {
1164 return false;
1165 }
1167 // Store pthread info into the OSThread
1168 #ifdef _ALLBSD_SOURCE
1169 osthread->set_thread_id(::pthread_self());
1170 #else
1171 osthread->set_thread_id(os::Bsd::gettid());
1172 #endif
1173 osthread->set_pthread_id(::pthread_self());
1175 // initialize floating point control register
1176 os::Bsd::init_thread_fpu_state();
1178 // Initial thread state is RUNNABLE
1179 osthread->set_state(RUNNABLE);
1181 thread->set_osthread(osthread);
1183 #ifndef _ALLBSD_SOURCE
1184 if (UseNUMA) {
1185 int lgrp_id = os::numa_get_group_id();
1186 if (lgrp_id != -1) {
1187 thread->set_lgrp_id(lgrp_id);
1188 }
1189 }
1191 if (os::Bsd::is_initial_thread()) {
1192 // If current thread is initial thread, its stack is mapped on demand,
1193 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map
1194 // the entire stack region to avoid SEGV in stack banging.
1195 // It is also useful to get around the heap-stack-gap problem on SuSE
1196 // kernel (see 4821821 for details). We first expand stack to the top
1197 // of yellow zone, then enable stack yellow zone (order is significant,
1198 // enabling yellow zone first will crash JVM on SuSE Bsd), so there
1199 // is no gap between the last two virtual memory regions.
1201 JavaThread *jt = (JavaThread *)thread;
1202 address addr = jt->stack_yellow_zone_base();
1203 assert(addr != NULL, "initialization problem?");
1204 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled");
1206 osthread->set_expanding_stack();
1207 os::Bsd::manually_expand_stack(jt, addr);
1208 osthread->clear_expanding_stack();
1209 }
1210 #endif
1212 // initialize signal mask for this thread
1213 // and save the caller's signal mask
1214 os::Bsd::hotspot_sigmask(thread);
1216 return true;
1217 }
1219 void os::pd_start_thread(Thread* thread) {
1220 OSThread * osthread = thread->osthread();
1221 assert(osthread->get_state() != INITIALIZED, "just checking");
1222 Monitor* sync_with_child = osthread->startThread_lock();
1223 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
1224 sync_with_child->notify();
1225 }
1227 // Free Bsd resources related to the OSThread
1228 void os::free_thread(OSThread* osthread) {
1229 assert(osthread != NULL, "osthread not set");
1231 if (Thread::current()->osthread() == osthread) {
1232 // Restore caller's signal mask
1233 sigset_t sigmask = osthread->caller_sigmask();
1234 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1235 }
1237 delete osthread;
1238 }
1240 //////////////////////////////////////////////////////////////////////////////
1241 // thread local storage
1243 int os::allocate_thread_local_storage() {
1244 pthread_key_t key;
1245 int rslt = pthread_key_create(&key, NULL);
1246 assert(rslt == 0, "cannot allocate thread local storage");
1247 return (int)key;
1248 }
1250 // Note: This is currently not used by VM, as we don't destroy TLS key
1251 // on VM exit.
1252 void os::free_thread_local_storage(int index) {
1253 int rslt = pthread_key_delete((pthread_key_t)index);
1254 assert(rslt == 0, "invalid index");
1255 }
1257 void os::thread_local_storage_at_put(int index, void* value) {
1258 int rslt = pthread_setspecific((pthread_key_t)index, value);
1259 assert(rslt == 0, "pthread_setspecific failed");
1260 }
1262 extern "C" Thread* get_thread() {
1263 return ThreadLocalStorage::thread();
1264 }
1266 //////////////////////////////////////////////////////////////////////////////
1267 // initial thread
1269 #ifndef _ALLBSD_SOURCE
1270 // Check if current thread is the initial thread, similar to Solaris thr_main.
1271 bool os::Bsd::is_initial_thread(void) {
1272 char dummy;
1273 // If called before init complete, thread stack bottom will be null.
1274 // Can be called if fatal error occurs before initialization.
1275 if (initial_thread_stack_bottom() == NULL) return false;
1276 assert(initial_thread_stack_bottom() != NULL &&
1277 initial_thread_stack_size() != 0,
1278 "os::init did not locate initial thread's stack region");
1279 if ((address)&dummy >= initial_thread_stack_bottom() &&
1280 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size())
1281 return true;
1282 else return false;
1283 }
1285 // Find the virtual memory area that contains addr
1286 static bool find_vma(address addr, address* vma_low, address* vma_high) {
1287 FILE *fp = fopen("/proc/self/maps", "r");
1288 if (fp) {
1289 address low, high;
1290 while (!feof(fp)) {
1291 if (fscanf(fp, "%p-%p", &low, &high) == 2) {
1292 if (low <= addr && addr < high) {
1293 if (vma_low) *vma_low = low;
1294 if (vma_high) *vma_high = high;
1295 fclose (fp);
1296 return true;
1297 }
1298 }
1299 for (;;) {
1300 int ch = fgetc(fp);
1301 if (ch == EOF || ch == (int)'\n') break;
1302 }
1303 }
1304 fclose(fp);
1305 }
1306 return false;
1307 }
1309 // Locate initial thread stack. This special handling of initial thread stack
1310 // is needed because pthread_getattr_np() on most (all?) Bsd distros returns
1311 // bogus value for initial thread.
1312 void os::Bsd::capture_initial_stack(size_t max_size) {
1313 // stack size is the easy part, get it from RLIMIT_STACK
1314 size_t stack_size;
1315 struct rlimit rlim;
1316 getrlimit(RLIMIT_STACK, &rlim);
1317 stack_size = rlim.rlim_cur;
1319 // 6308388: a bug in ld.so will relocate its own .data section to the
1320 // lower end of primordial stack; reduce ulimit -s value a little bit
1321 // so we won't install guard page on ld.so's data section.
1322 stack_size -= 2 * page_size();
1324 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat
1325 // 7.1, in both cases we will get 2G in return value.
1326 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0,
1327 // SuSE 7.2, Debian) can not handle alternate signal stack correctly
1328 // for initial thread if its stack size exceeds 6M. Cap it at 2M,
1329 // in case other parts in glibc still assumes 2M max stack size.
1330 // FIXME: alt signal stack is gone, maybe we can relax this constraint?
1331 #ifndef IA64
1332 if (stack_size > 2 * K * K) stack_size = 2 * K * K;
1333 #else
1334 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small
1335 if (stack_size > 4 * K * K) stack_size = 4 * K * K;
1336 #endif
1338 // Try to figure out where the stack base (top) is. This is harder.
1339 //
1340 // When an application is started, glibc saves the initial stack pointer in
1341 // a global variable "__libc_stack_end", which is then used by system
1342 // libraries. __libc_stack_end should be pretty close to stack top. The
1343 // variable is available since the very early days. However, because it is
1344 // a private interface, it could disappear in the future.
1345 //
1346 // Bsd kernel saves start_stack information in /proc/<pid>/stat. Similar
1347 // to __libc_stack_end, it is very close to stack top, but isn't the real
1348 // stack top. Note that /proc may not exist if VM is running as a chroot
1349 // program, so reading /proc/<pid>/stat could fail. Also the contents of
1350 // /proc/<pid>/stat could change in the future (though unlikely).
1351 //
1352 // We try __libc_stack_end first. If that doesn't work, look for
1353 // /proc/<pid>/stat. If neither of them works, we use current stack pointer
1354 // as a hint, which should work well in most cases.
1356 uintptr_t stack_start;
1358 // try __libc_stack_end first
1359 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end");
1360 if (p && *p) {
1361 stack_start = *p;
1362 } else {
1363 // see if we can get the start_stack field from /proc/self/stat
1364 FILE *fp;
1365 int pid;
1366 char state;
1367 int ppid;
1368 int pgrp;
1369 int session;
1370 int nr;
1371 int tpgrp;
1372 unsigned long flags;
1373 unsigned long minflt;
1374 unsigned long cminflt;
1375 unsigned long majflt;
1376 unsigned long cmajflt;
1377 unsigned long utime;
1378 unsigned long stime;
1379 long cutime;
1380 long cstime;
1381 long prio;
1382 long nice;
1383 long junk;
1384 long it_real;
1385 uintptr_t start;
1386 uintptr_t vsize;
1387 intptr_t rss;
1388 uintptr_t rsslim;
1389 uintptr_t scodes;
1390 uintptr_t ecode;
1391 int i;
1393 // Figure what the primordial thread stack base is. Code is inspired
1394 // by email from Hans Boehm. /proc/self/stat begins with current pid,
1395 // followed by command name surrounded by parentheses, state, etc.
1396 char stat[2048];
1397 int statlen;
1399 fp = fopen("/proc/self/stat", "r");
1400 if (fp) {
1401 statlen = fread(stat, 1, 2047, fp);
1402 stat[statlen] = '\0';
1403 fclose(fp);
1405 // Skip pid and the command string. Note that we could be dealing with
1406 // weird command names, e.g. user could decide to rename java launcher
1407 // to "java 1.4.2 :)", then the stat file would look like
1408 // 1234 (java 1.4.2 :)) R ... ...
1409 // We don't really need to know the command string, just find the last
1410 // occurrence of ")" and then start parsing from there. See bug 4726580.
1411 char * s = strrchr(stat, ')');
1413 i = 0;
1414 if (s) {
1415 // Skip blank chars
1416 do s++; while (isspace(*s));
1418 #define _UFM UINTX_FORMAT
1419 #define _DFM INTX_FORMAT
1421 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */
1422 /* 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 */
1423 i = sscanf(s, "%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld " _UFM _UFM _DFM _UFM _UFM _UFM _UFM,
1424 &state, /* 3 %c */
1425 &ppid, /* 4 %d */
1426 &pgrp, /* 5 %d */
1427 &session, /* 6 %d */
1428 &nr, /* 7 %d */
1429 &tpgrp, /* 8 %d */
1430 &flags, /* 9 %lu */
1431 &minflt, /* 10 %lu */
1432 &cminflt, /* 11 %lu */
1433 &majflt, /* 12 %lu */
1434 &cmajflt, /* 13 %lu */
1435 &utime, /* 14 %lu */
1436 &stime, /* 15 %lu */
1437 &cutime, /* 16 %ld */
1438 &cstime, /* 17 %ld */
1439 &prio, /* 18 %ld */
1440 &nice, /* 19 %ld */
1441 &junk, /* 20 %ld */
1442 &it_real, /* 21 %ld */
1443 &start, /* 22 UINTX_FORMAT */
1444 &vsize, /* 23 UINTX_FORMAT */
1445 &rss, /* 24 INTX_FORMAT */
1446 &rsslim, /* 25 UINTX_FORMAT */
1447 &scodes, /* 26 UINTX_FORMAT */
1448 &ecode, /* 27 UINTX_FORMAT */
1449 &stack_start); /* 28 UINTX_FORMAT */
1450 }
1452 #undef _UFM
1453 #undef _DFM
1455 if (i != 28 - 2) {
1456 assert(false, "Bad conversion from /proc/self/stat");
1457 // product mode - assume we are the initial thread, good luck in the
1458 // embedded case.
1459 warning("Can't detect initial thread stack location - bad conversion");
1460 stack_start = (uintptr_t) &rlim;
1461 }
1462 } else {
1463 // For some reason we can't open /proc/self/stat (for example, running on
1464 // FreeBSD with a Bsd emulator, or inside chroot), this should work for
1465 // most cases, so don't abort:
1466 warning("Can't detect initial thread stack location - no /proc/self/stat");
1467 stack_start = (uintptr_t) &rlim;
1468 }
1469 }
1471 // Now we have a pointer (stack_start) very close to the stack top, the
1472 // next thing to do is to figure out the exact location of stack top. We
1473 // can find out the virtual memory area that contains stack_start by
1474 // reading /proc/self/maps, it should be the last vma in /proc/self/maps,
1475 // and its upper limit is the real stack top. (again, this would fail if
1476 // running inside chroot, because /proc may not exist.)
1478 uintptr_t stack_top;
1479 address low, high;
1480 if (find_vma((address)stack_start, &low, &high)) {
1481 // success, "high" is the true stack top. (ignore "low", because initial
1482 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.)
1483 stack_top = (uintptr_t)high;
1484 } else {
1485 // failed, likely because /proc/self/maps does not exist
1486 warning("Can't detect initial thread stack location - find_vma failed");
1487 // best effort: stack_start is normally within a few pages below the real
1488 // stack top, use it as stack top, and reduce stack size so we won't put
1489 // guard page outside stack.
1490 stack_top = stack_start;
1491 stack_size -= 16 * page_size();
1492 }
1494 // stack_top could be partially down the page so align it
1495 stack_top = align_size_up(stack_top, page_size());
1497 if (max_size && stack_size > max_size) {
1498 _initial_thread_stack_size = max_size;
1499 } else {
1500 _initial_thread_stack_size = stack_size;
1501 }
1503 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size());
1504 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size;
1505 }
1506 #endif
1508 ////////////////////////////////////////////////////////////////////////////////
1509 // time support
1511 // Time since start-up in seconds to a fine granularity.
1512 // Used by VMSelfDestructTimer and the MemProfiler.
1513 double os::elapsedTime() {
1515 return (double)(os::elapsed_counter()) * 0.000001;
1516 }
1518 jlong os::elapsed_counter() {
1519 timeval time;
1520 int status = gettimeofday(&time, NULL);
1521 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1522 }
1524 jlong os::elapsed_frequency() {
1525 return (1000 * 1000);
1526 }
1528 // XXX: For now, code this as if BSD does not support vtime.
1529 bool os::supports_vtime() { return false; }
1530 bool os::enable_vtime() { return false; }
1531 bool os::vtime_enabled() { return false; }
1532 double os::elapsedVTime() {
1533 // better than nothing, but not much
1534 return elapsedTime();
1535 }
1537 jlong os::javaTimeMillis() {
1538 timeval time;
1539 int status = gettimeofday(&time, NULL);
1540 assert(status != -1, "bsd error");
1541 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1542 }
1544 #ifndef CLOCK_MONOTONIC
1545 #define CLOCK_MONOTONIC (1)
1546 #endif
1548 #ifdef __APPLE__
1549 void os::Bsd::clock_init() {
1550 // XXXDARWIN: Investigate replacement monotonic clock
1551 }
1552 #elif defined(_ALLBSD_SOURCE)
1553 void os::Bsd::clock_init() {
1554 struct timespec res;
1555 struct timespec tp;
1556 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
1557 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
1558 // yes, monotonic clock is supported
1559 _clock_gettime = ::clock_gettime;
1560 }
1561 }
1562 #else
1563 void os::Bsd::clock_init() {
1564 // we do dlopen's in this particular order due to bug in bsd
1565 // dynamical loader (see 6348968) leading to crash on exit
1566 void* handle = dlopen("librt.so.1", RTLD_LAZY);
1567 if (handle == NULL) {
1568 handle = dlopen("librt.so", RTLD_LAZY);
1569 }
1571 if (handle) {
1572 int (*clock_getres_func)(clockid_t, struct timespec*) =
1573 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres");
1574 int (*clock_gettime_func)(clockid_t, struct timespec*) =
1575 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime");
1576 if (clock_getres_func && clock_gettime_func) {
1577 // See if monotonic clock is supported by the kernel. Note that some
1578 // early implementations simply return kernel jiffies (updated every
1579 // 1/100 or 1/1000 second). It would be bad to use such a low res clock
1580 // for nano time (though the monotonic property is still nice to have).
1581 // It's fixed in newer kernels, however clock_getres() still returns
1582 // 1/HZ. We check if clock_getres() works, but will ignore its reported
1583 // resolution for now. Hopefully as people move to new kernels, this
1584 // won't be a problem.
1585 struct timespec res;
1586 struct timespec tp;
1587 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 &&
1588 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) {
1589 // yes, monotonic clock is supported
1590 _clock_gettime = clock_gettime_func;
1591 } else {
1592 // close librt if there is no monotonic clock
1593 dlclose(handle);
1594 }
1595 }
1596 }
1597 }
1598 #endif
1600 #ifndef _ALLBSD_SOURCE
1601 #ifndef SYS_clock_getres
1603 #if defined(IA32) || defined(AMD64)
1604 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229)
1605 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y)
1606 #else
1607 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time"
1608 #define sys_clock_getres(x,y) -1
1609 #endif
1611 #else
1612 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y)
1613 #endif
1615 void os::Bsd::fast_thread_clock_init() {
1616 if (!UseBsdPosixThreadCPUClocks) {
1617 return;
1618 }
1619 clockid_t clockid;
1620 struct timespec tp;
1621 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) =
1622 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid");
1624 // Switch to using fast clocks for thread cpu time if
1625 // the sys_clock_getres() returns 0 error code.
1626 // Note, that some kernels may support the current thread
1627 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks
1628 // returned by the pthread_getcpuclockid().
1629 // If the fast Posix clocks are supported then the sys_clock_getres()
1630 // must return at least tp.tv_sec == 0 which means a resolution
1631 // better than 1 sec. This is extra check for reliability.
1633 if(pthread_getcpuclockid_func &&
1634 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 &&
1635 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) {
1637 _supports_fast_thread_cpu_time = true;
1638 _pthread_getcpuclockid = pthread_getcpuclockid_func;
1639 }
1640 }
1641 #endif
1643 jlong os::javaTimeNanos() {
1644 if (Bsd::supports_monotonic_clock()) {
1645 struct timespec tp;
1646 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp);
1647 assert(status == 0, "gettime error");
1648 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
1649 return result;
1650 } else {
1651 timeval time;
1652 int status = gettimeofday(&time, NULL);
1653 assert(status != -1, "bsd error");
1654 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1655 return 1000 * usecs;
1656 }
1657 }
1659 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1660 if (Bsd::supports_monotonic_clock()) {
1661 info_ptr->max_value = ALL_64_BITS;
1663 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1664 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1665 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1666 } else {
1667 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1668 info_ptr->max_value = ALL_64_BITS;
1670 // gettimeofday is a real time clock so it skips
1671 info_ptr->may_skip_backward = true;
1672 info_ptr->may_skip_forward = true;
1673 }
1675 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1676 }
1678 // Return the real, user, and system times in seconds from an
1679 // arbitrary fixed point in the past.
1680 bool os::getTimesSecs(double* process_real_time,
1681 double* process_user_time,
1682 double* process_system_time) {
1683 struct tms ticks;
1684 clock_t real_ticks = times(&ticks);
1686 if (real_ticks == (clock_t) (-1)) {
1687 return false;
1688 } else {
1689 double ticks_per_second = (double) clock_tics_per_sec;
1690 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1691 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1692 *process_real_time = ((double) real_ticks) / ticks_per_second;
1694 return true;
1695 }
1696 }
1699 char * os::local_time_string(char *buf, size_t buflen) {
1700 struct tm t;
1701 time_t long_time;
1702 time(&long_time);
1703 localtime_r(&long_time, &t);
1704 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1705 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1706 t.tm_hour, t.tm_min, t.tm_sec);
1707 return buf;
1708 }
1710 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1711 return localtime_r(clock, res);
1712 }
1714 ////////////////////////////////////////////////////////////////////////////////
1715 // runtime exit support
1717 // Note: os::shutdown() might be called very early during initialization, or
1718 // called from signal handler. Before adding something to os::shutdown(), make
1719 // sure it is async-safe and can handle partially initialized VM.
1720 void os::shutdown() {
1722 // allow PerfMemory to attempt cleanup of any persistent resources
1723 perfMemory_exit();
1725 // needs to remove object in file system
1726 AttachListener::abort();
1728 // flush buffered output, finish log files
1729 ostream_abort();
1731 // Check for abort hook
1732 abort_hook_t abort_hook = Arguments::abort_hook();
1733 if (abort_hook != NULL) {
1734 abort_hook();
1735 }
1737 }
1739 // Note: os::abort() might be called very early during initialization, or
1740 // called from signal handler. Before adding something to os::abort(), make
1741 // sure it is async-safe and can handle partially initialized VM.
1742 void os::abort(bool dump_core) {
1743 os::shutdown();
1744 if (dump_core) {
1745 #ifndef PRODUCT
1746 fdStream out(defaultStream::output_fd());
1747 out.print_raw("Current thread is ");
1748 char buf[16];
1749 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1750 out.print_raw_cr(buf);
1751 out.print_raw_cr("Dumping core ...");
1752 #endif
1753 ::abort(); // dump core
1754 }
1756 ::exit(1);
1757 }
1759 // Die immediately, no exit hook, no abort hook, no cleanup.
1760 void os::die() {
1761 // _exit() on BsdThreads only kills current thread
1762 ::abort();
1763 }
1765 // unused on bsd for now.
1766 void os::set_error_file(const char *logfile) {}
1769 // This method is a copy of JDK's sysGetLastErrorString
1770 // from src/solaris/hpi/src/system_md.c
1772 size_t os::lasterror(char *buf, size_t len) {
1774 if (errno == 0) return 0;
1776 const char *s = ::strerror(errno);
1777 size_t n = ::strlen(s);
1778 if (n >= len) {
1779 n = len - 1;
1780 }
1781 ::strncpy(buf, s, n);
1782 buf[n] = '\0';
1783 return n;
1784 }
1786 intx os::current_thread_id() { return (intx)pthread_self(); }
1787 int os::current_process_id() {
1789 // Under the old bsd thread library, bsd gives each thread
1790 // its own process id. Because of this each thread will return
1791 // a different pid if this method were to return the result
1792 // of getpid(2). Bsd provides no api that returns the pid
1793 // of the launcher thread for the vm. This implementation
1794 // returns a unique pid, the pid of the launcher thread
1795 // that starts the vm 'process'.
1797 // Under the NPTL, getpid() returns the same pid as the
1798 // launcher thread rather than a unique pid per thread.
1799 // Use gettid() if you want the old pre NPTL behaviour.
1801 // if you are looking for the result of a call to getpid() that
1802 // returns a unique pid for the calling thread, then look at the
1803 // OSThread::thread_id() method in osThread_bsd.hpp file
1805 return (int)(_initial_pid ? _initial_pid : getpid());
1806 }
1808 // DLL functions
1810 #define JNI_LIB_PREFIX "lib"
1811 #ifdef __APPLE__
1812 #define JNI_LIB_SUFFIX ".dylib"
1813 #else
1814 #define JNI_LIB_SUFFIX ".so"
1815 #endif
1817 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1819 // This must be hard coded because it's the system's temporary
1820 // directory not the java application's temp directory, ala java.io.tmpdir.
1821 #ifdef __APPLE__
1822 // macosx has a secure per-user temporary directory
1823 char temp_path_storage[PATH_MAX];
1824 const char* os::get_temp_directory() {
1825 static char *temp_path = NULL;
1826 if (temp_path == NULL) {
1827 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1828 if (pathSize == 0 || pathSize > PATH_MAX) {
1829 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1830 }
1831 temp_path = temp_path_storage;
1832 }
1833 return temp_path;
1834 }
1835 #else /* __APPLE__ */
1836 const char* os::get_temp_directory() { return "/tmp"; }
1837 #endif /* __APPLE__ */
1839 static bool file_exists(const char* filename) {
1840 struct stat statbuf;
1841 if (filename == NULL || strlen(filename) == 0) {
1842 return false;
1843 }
1844 return os::stat(filename, &statbuf) == 0;
1845 }
1847 void os::dll_build_name(char* buffer, size_t buflen,
1848 const char* pname, const char* fname) {
1849 // Copied from libhpi
1850 const size_t pnamelen = pname ? strlen(pname) : 0;
1852 // Quietly truncate on buffer overflow. Should be an error.
1853 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
1854 *buffer = '\0';
1855 return;
1856 }
1858 if (pnamelen == 0) {
1859 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
1860 } else if (strchr(pname, *os::path_separator()) != NULL) {
1861 int n;
1862 char** pelements = split_path(pname, &n);
1863 for (int i = 0 ; i < n ; i++) {
1864 // Really shouldn't be NULL, but check can't hurt
1865 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1866 continue; // skip the empty path values
1867 }
1868 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
1869 pelements[i], fname);
1870 if (file_exists(buffer)) {
1871 break;
1872 }
1873 }
1874 // release the storage
1875 for (int i = 0 ; i < n ; i++) {
1876 if (pelements[i] != NULL) {
1877 FREE_C_HEAP_ARRAY(char, pelements[i]);
1878 }
1879 }
1880 if (pelements != NULL) {
1881 FREE_C_HEAP_ARRAY(char*, pelements);
1882 }
1883 } else {
1884 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
1885 }
1886 }
1888 const char* os::get_current_directory(char *buf, int buflen) {
1889 return getcwd(buf, buflen);
1890 }
1892 // check if addr is inside libjvm[_g].so
1893 bool os::address_is_in_vm(address addr) {
1894 static address libjvm_base_addr;
1895 Dl_info dlinfo;
1897 if (libjvm_base_addr == NULL) {
1898 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1899 libjvm_base_addr = (address)dlinfo.dli_fbase;
1900 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1901 }
1903 if (dladdr((void *)addr, &dlinfo)) {
1904 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1905 }
1907 return false;
1908 }
1910 bool os::dll_address_to_function_name(address addr, char *buf,
1911 int buflen, int *offset) {
1912 Dl_info dlinfo;
1914 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) {
1915 if (buf != NULL) {
1916 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1917 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1918 }
1919 }
1920 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1921 return true;
1922 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1923 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1924 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) {
1925 return true;
1926 }
1927 }
1929 if (buf != NULL) buf[0] = '\0';
1930 if (offset != NULL) *offset = -1;
1931 return false;
1932 }
1934 #ifdef _ALLBSD_SOURCE
1935 // ported from solaris version
1936 bool os::dll_address_to_library_name(address addr, char* buf,
1937 int buflen, int* offset) {
1938 Dl_info dlinfo;
1940 if (dladdr((void*)addr, &dlinfo)){
1941 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1942 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
1943 return true;
1944 } else {
1945 if (buf) buf[0] = '\0';
1946 if (offset) *offset = -1;
1947 return false;
1948 }
1949 }
1950 #else
1951 struct _address_to_library_name {
1952 address addr; // input : memory address
1953 size_t buflen; // size of fname
1954 char* fname; // output: library name
1955 address base; // library base addr
1956 };
1958 static int address_to_library_name_callback(struct dl_phdr_info *info,
1959 size_t size, void *data) {
1960 int i;
1961 bool found = false;
1962 address libbase = NULL;
1963 struct _address_to_library_name * d = (struct _address_to_library_name *)data;
1965 // iterate through all loadable segments
1966 for (i = 0; i < info->dlpi_phnum; i++) {
1967 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr);
1968 if (info->dlpi_phdr[i].p_type == PT_LOAD) {
1969 // base address of a library is the lowest address of its loaded
1970 // segments.
1971 if (libbase == NULL || libbase > segbase) {
1972 libbase = segbase;
1973 }
1974 // see if 'addr' is within current segment
1975 if (segbase <= d->addr &&
1976 d->addr < segbase + info->dlpi_phdr[i].p_memsz) {
1977 found = true;
1978 }
1979 }
1980 }
1982 // dlpi_name is NULL or empty if the ELF file is executable, return 0
1983 // so dll_address_to_library_name() can fall through to use dladdr() which
1984 // can figure out executable name from argv[0].
1985 if (found && info->dlpi_name && info->dlpi_name[0]) {
1986 d->base = libbase;
1987 if (d->fname) {
1988 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name);
1989 }
1990 return 1;
1991 }
1992 return 0;
1993 }
1995 bool os::dll_address_to_library_name(address addr, char* buf,
1996 int buflen, int* offset) {
1997 Dl_info dlinfo;
1998 struct _address_to_library_name data;
2000 // There is a bug in old glibc dladdr() implementation that it could resolve
2001 // to wrong library name if the .so file has a base address != NULL. Here
2002 // we iterate through the program headers of all loaded libraries to find
2003 // out which library 'addr' really belongs to. This workaround can be
2004 // removed once the minimum requirement for glibc is moved to 2.3.x.
2005 data.addr = addr;
2006 data.fname = buf;
2007 data.buflen = buflen;
2008 data.base = NULL;
2009 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data);
2011 if (rslt) {
2012 // buf already contains library name
2013 if (offset) *offset = addr - data.base;
2014 return true;
2015 } else if (dladdr((void*)addr, &dlinfo)){
2016 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
2017 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
2018 return true;
2019 } else {
2020 if (buf) buf[0] = '\0';
2021 if (offset) *offset = -1;
2022 return false;
2023 }
2024 }
2025 #endif
2027 // Loads .dll/.so and
2028 // in case of error it checks if .dll/.so was built for the
2029 // same architecture as Hotspot is running on
2031 #ifdef __APPLE__
2032 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
2033 void * result= ::dlopen(filename, RTLD_LAZY);
2034 if (result != NULL) {
2035 // Successful loading
2036 return result;
2037 }
2039 // Read system error message into ebuf
2040 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2041 ebuf[ebuflen-1]='\0';
2043 return NULL;
2044 }
2045 #else
2046 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2047 {
2048 void * result= ::dlopen(filename, RTLD_LAZY);
2049 if (result != NULL) {
2050 // Successful loading
2051 return result;
2052 }
2054 Elf32_Ehdr elf_head;
2056 // Read system error message into ebuf
2057 // It may or may not be overwritten below
2058 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2059 ebuf[ebuflen-1]='\0';
2060 int diag_msg_max_length=ebuflen-strlen(ebuf);
2061 char* diag_msg_buf=ebuf+strlen(ebuf);
2063 if (diag_msg_max_length==0) {
2064 // No more space in ebuf for additional diagnostics message
2065 return NULL;
2066 }
2069 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2071 if (file_descriptor < 0) {
2072 // Can't open library, report dlerror() message
2073 return NULL;
2074 }
2076 bool failed_to_read_elf_head=
2077 (sizeof(elf_head)!=
2078 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2080 ::close(file_descriptor);
2081 if (failed_to_read_elf_head) {
2082 // file i/o error - report dlerror() msg
2083 return NULL;
2084 }
2086 typedef struct {
2087 Elf32_Half code; // Actual value as defined in elf.h
2088 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2089 char elf_class; // 32 or 64 bit
2090 char endianess; // MSB or LSB
2091 char* name; // String representation
2092 } arch_t;
2094 #ifndef EM_486
2095 #define EM_486 6 /* Intel 80486 */
2096 #endif
2098 #ifndef EM_MIPS_RS3_LE
2099 #define EM_MIPS_RS3_LE 10 /* MIPS */
2100 #endif
2102 #ifndef EM_PPC64
2103 #define EM_PPC64 21 /* PowerPC64 */
2104 #endif
2106 #ifndef EM_S390
2107 #define EM_S390 22 /* IBM System/390 */
2108 #endif
2110 #ifndef EM_IA_64
2111 #define EM_IA_64 50 /* HP/Intel IA-64 */
2112 #endif
2114 #ifndef EM_X86_64
2115 #define EM_X86_64 62 /* AMD x86-64 */
2116 #endif
2118 static const arch_t arch_array[]={
2119 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2120 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2121 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2122 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2123 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2124 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2125 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2126 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2127 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2128 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
2129 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
2130 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
2131 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
2132 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
2133 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
2134 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
2135 };
2137 #if (defined IA32)
2138 static Elf32_Half running_arch_code=EM_386;
2139 #elif (defined AMD64)
2140 static Elf32_Half running_arch_code=EM_X86_64;
2141 #elif (defined IA64)
2142 static Elf32_Half running_arch_code=EM_IA_64;
2143 #elif (defined __sparc) && (defined _LP64)
2144 static Elf32_Half running_arch_code=EM_SPARCV9;
2145 #elif (defined __sparc) && (!defined _LP64)
2146 static Elf32_Half running_arch_code=EM_SPARC;
2147 #elif (defined __powerpc64__)
2148 static Elf32_Half running_arch_code=EM_PPC64;
2149 #elif (defined __powerpc__)
2150 static Elf32_Half running_arch_code=EM_PPC;
2151 #elif (defined ARM)
2152 static Elf32_Half running_arch_code=EM_ARM;
2153 #elif (defined S390)
2154 static Elf32_Half running_arch_code=EM_S390;
2155 #elif (defined ALPHA)
2156 static Elf32_Half running_arch_code=EM_ALPHA;
2157 #elif (defined MIPSEL)
2158 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
2159 #elif (defined PARISC)
2160 static Elf32_Half running_arch_code=EM_PARISC;
2161 #elif (defined MIPS)
2162 static Elf32_Half running_arch_code=EM_MIPS;
2163 #elif (defined M68K)
2164 static Elf32_Half running_arch_code=EM_68K;
2165 #else
2166 #error Method os::dll_load requires that one of following is defined:\
2167 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
2168 #endif
2170 // Identify compatability class for VM's architecture and library's architecture
2171 // Obtain string descriptions for architectures
2173 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2174 int running_arch_index=-1;
2176 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2177 if (running_arch_code == arch_array[i].code) {
2178 running_arch_index = i;
2179 }
2180 if (lib_arch.code == arch_array[i].code) {
2181 lib_arch.compat_class = arch_array[i].compat_class;
2182 lib_arch.name = arch_array[i].name;
2183 }
2184 }
2186 assert(running_arch_index != -1,
2187 "Didn't find running architecture code (running_arch_code) in arch_array");
2188 if (running_arch_index == -1) {
2189 // Even though running architecture detection failed
2190 // we may still continue with reporting dlerror() message
2191 return NULL;
2192 }
2194 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2195 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2196 return NULL;
2197 }
2199 #ifndef S390
2200 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2201 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2202 return NULL;
2203 }
2204 #endif // !S390
2206 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2207 if ( lib_arch.name!=NULL ) {
2208 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2209 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2210 lib_arch.name, arch_array[running_arch_index].name);
2211 } else {
2212 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2213 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2214 lib_arch.code,
2215 arch_array[running_arch_index].name);
2216 }
2217 }
2219 return NULL;
2220 }
2221 #endif /* !__APPLE__ */
2223 // XXX: Do we need a lock around this as per Linux?
2224 void* os::dll_lookup(void* handle, const char* name) {
2225 return dlsym(handle, name);
2226 }
2229 static bool _print_ascii_file(const char* filename, outputStream* st) {
2230 int fd = ::open(filename, O_RDONLY);
2231 if (fd == -1) {
2232 return false;
2233 }
2235 char buf[32];
2236 int bytes;
2237 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2238 st->print_raw(buf, bytes);
2239 }
2241 ::close(fd);
2243 return true;
2244 }
2246 void os::print_dll_info(outputStream *st) {
2247 st->print_cr("Dynamic libraries:");
2248 #ifdef _ALLBSD_SOURCE
2249 #ifdef RTLD_DI_LINKMAP
2250 Dl_info dli;
2251 void *handle;
2252 Link_map *map;
2253 Link_map *p;
2255 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
2256 st->print_cr("Error: Cannot print dynamic libraries.");
2257 return;
2258 }
2259 handle = dlopen(dli.dli_fname, RTLD_LAZY);
2260 if (handle == NULL) {
2261 st->print_cr("Error: Cannot print dynamic libraries.");
2262 return;
2263 }
2264 dlinfo(handle, RTLD_DI_LINKMAP, &map);
2265 if (map == NULL) {
2266 st->print_cr("Error: Cannot print dynamic libraries.");
2267 return;
2268 }
2270 while (map->l_prev != NULL)
2271 map = map->l_prev;
2273 while (map != NULL) {
2274 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2275 map = map->l_next;
2276 }
2278 dlclose(handle);
2279 #elif defined(__APPLE__)
2280 uint32_t count;
2281 uint32_t i;
2283 count = _dyld_image_count();
2284 for (i = 1; i < count; i++) {
2285 const char *name = _dyld_get_image_name(i);
2286 intptr_t slide = _dyld_get_image_vmaddr_slide(i);
2287 st->print_cr(PTR_FORMAT " \t%s", slide, name);
2288 }
2289 #else
2290 st->print_cr("Error: Cannot print dynamic libraries.");
2291 #endif
2292 #else
2293 char fname[32];
2294 pid_t pid = os::Bsd::gettid();
2296 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid);
2298 if (!_print_ascii_file(fname, st)) {
2299 st->print("Can not get library information for pid = %d\n", pid);
2300 }
2301 #endif
2302 }
2305 void os::print_os_info(outputStream* st) {
2306 st->print("OS:");
2308 // Try to identify popular distros.
2309 // Most Bsd distributions have /etc/XXX-release file, which contains
2310 // the OS version string. Some have more than one /etc/XXX-release file
2311 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.),
2312 // so the order is important.
2313 if (!_print_ascii_file("/etc/mandrake-release", st) &&
2314 !_print_ascii_file("/etc/sun-release", st) &&
2315 !_print_ascii_file("/etc/redhat-release", st) &&
2316 !_print_ascii_file("/etc/SuSE-release", st) &&
2317 !_print_ascii_file("/etc/turbobsd-release", st) &&
2318 !_print_ascii_file("/etc/gentoo-release", st) &&
2319 !_print_ascii_file("/etc/debian_version", st) &&
2320 !_print_ascii_file("/etc/ltib-release", st) &&
2321 !_print_ascii_file("/etc/angstrom-version", st)) {
2322 st->print("Bsd");
2323 }
2324 st->cr();
2326 // kernel
2327 st->print("uname:");
2328 struct utsname name;
2329 uname(&name);
2330 st->print(name.sysname); st->print(" ");
2331 st->print(name.release); st->print(" ");
2332 st->print(name.version); st->print(" ");
2333 st->print(name.machine);
2334 st->cr();
2336 #ifndef _ALLBSD_SOURCE
2337 // Print warning if unsafe chroot environment detected
2338 if (unsafe_chroot_detected) {
2339 st->print("WARNING!! ");
2340 st->print_cr(unstable_chroot_error);
2341 }
2343 // libc, pthread
2344 st->print("libc:");
2345 st->print(os::Bsd::glibc_version()); st->print(" ");
2346 st->print(os::Bsd::libpthread_version()); st->print(" ");
2347 if (os::Bsd::is_BsdThreads()) {
2348 st->print("(%s stack)", os::Bsd::is_floating_stack() ? "floating" : "fixed");
2349 }
2350 st->cr();
2351 #endif
2353 // rlimit
2354 st->print("rlimit:");
2355 struct rlimit rlim;
2357 st->print(" STACK ");
2358 getrlimit(RLIMIT_STACK, &rlim);
2359 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2360 else st->print("%uk", rlim.rlim_cur >> 10);
2362 st->print(", CORE ");
2363 getrlimit(RLIMIT_CORE, &rlim);
2364 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2365 else st->print("%uk", rlim.rlim_cur >> 10);
2367 st->print(", NPROC ");
2368 getrlimit(RLIMIT_NPROC, &rlim);
2369 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2370 else st->print("%d", rlim.rlim_cur);
2372 st->print(", NOFILE ");
2373 getrlimit(RLIMIT_NOFILE, &rlim);
2374 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2375 else st->print("%d", rlim.rlim_cur);
2377 #ifndef _ALLBSD_SOURCE
2378 st->print(", AS ");
2379 getrlimit(RLIMIT_AS, &rlim);
2380 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2381 else st->print("%uk", rlim.rlim_cur >> 10);
2382 st->cr();
2384 // load average
2385 st->print("load average:");
2386 double loadavg[3];
2387 os::loadavg(loadavg, 3);
2388 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
2389 st->cr();
2390 #endif
2391 }
2393 void os::pd_print_cpu_info(outputStream* st) {
2394 // Nothing to do for now.
2395 }
2397 void os::print_memory_info(outputStream* st) {
2399 st->print("Memory:");
2400 st->print(" %dk page", os::vm_page_size()>>10);
2402 #ifndef _ALLBSD_SOURCE
2403 // values in struct sysinfo are "unsigned long"
2404 struct sysinfo si;
2405 sysinfo(&si);
2406 #endif
2408 st->print(", physical " UINT64_FORMAT "k",
2409 os::physical_memory() >> 10);
2410 st->print("(" UINT64_FORMAT "k free)",
2411 os::available_memory() >> 10);
2412 #ifndef _ALLBSD_SOURCE
2413 st->print(", swap " UINT64_FORMAT "k",
2414 ((jlong)si.totalswap * si.mem_unit) >> 10);
2415 st->print("(" UINT64_FORMAT "k free)",
2416 ((jlong)si.freeswap * si.mem_unit) >> 10);
2417 #endif
2418 st->cr();
2420 // meminfo
2421 st->print("\n/proc/meminfo:\n");
2422 _print_ascii_file("/proc/meminfo", st);
2423 st->cr();
2424 }
2426 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific
2427 // but they're the same for all the bsd arch that we support
2428 // and they're the same for solaris but there's no common place to put this.
2429 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2430 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2431 "ILL_COPROC", "ILL_BADSTK" };
2433 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2434 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2435 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" };
2437 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2439 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2441 void os::print_siginfo(outputStream* st, void* siginfo) {
2442 st->print("siginfo:");
2444 const int buflen = 100;
2445 char buf[buflen];
2446 siginfo_t *si = (siginfo_t*)siginfo;
2447 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2448 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) {
2449 st->print("si_errno=%s", buf);
2450 } else {
2451 st->print("si_errno=%d", si->si_errno);
2452 }
2453 const int c = si->si_code;
2454 assert(c > 0, "unexpected si_code");
2455 switch (si->si_signo) {
2456 case SIGILL:
2457 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2458 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2459 break;
2460 case SIGFPE:
2461 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2462 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2463 break;
2464 case SIGSEGV:
2465 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2466 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2467 break;
2468 case SIGBUS:
2469 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2470 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2471 break;
2472 default:
2473 st->print(", si_code=%d", si->si_code);
2474 // no si_addr
2475 }
2477 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2478 UseSharedSpaces) {
2479 FileMapInfo* mapinfo = FileMapInfo::current_info();
2480 if (mapinfo->is_in_shared_space(si->si_addr)) {
2481 st->print("\n\nError accessing class data sharing archive." \
2482 " Mapped file inaccessible during execution, " \
2483 " possible disk/network problem.");
2484 }
2485 }
2486 st->cr();
2487 }
2490 static void print_signal_handler(outputStream* st, int sig,
2491 char* buf, size_t buflen);
2493 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2494 st->print_cr("Signal Handlers:");
2495 print_signal_handler(st, SIGSEGV, buf, buflen);
2496 print_signal_handler(st, SIGBUS , buf, buflen);
2497 print_signal_handler(st, SIGFPE , buf, buflen);
2498 print_signal_handler(st, SIGPIPE, buf, buflen);
2499 print_signal_handler(st, SIGXFSZ, buf, buflen);
2500 print_signal_handler(st, SIGILL , buf, buflen);
2501 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2502 print_signal_handler(st, SR_signum, buf, buflen);
2503 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
2504 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2505 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
2506 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2507 }
2509 static char saved_jvm_path[MAXPATHLEN] = {0};
2511 // Find the full path to the current module, libjvm.so or libjvm_g.so
2512 void os::jvm_path(char *buf, jint buflen) {
2513 // Error checking.
2514 if (buflen < MAXPATHLEN) {
2515 assert(false, "must use a large-enough buffer");
2516 buf[0] = '\0';
2517 return;
2518 }
2519 // Lazy resolve the path to current module.
2520 if (saved_jvm_path[0] != 0) {
2521 strcpy(buf, saved_jvm_path);
2522 return;
2523 }
2525 char dli_fname[MAXPATHLEN];
2526 bool ret = dll_address_to_library_name(
2527 CAST_FROM_FN_PTR(address, os::jvm_path),
2528 dli_fname, sizeof(dli_fname), NULL);
2529 assert(ret != 0, "cannot locate libjvm");
2530 char *rp = realpath(dli_fname, buf);
2531 if (rp == NULL)
2532 return;
2534 if (Arguments::created_by_gamma_launcher()) {
2535 // Support for the gamma launcher. Typical value for buf is
2536 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2537 // the right place in the string, then assume we are installed in a JDK and
2538 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2539 // up the path so it looks like libjvm.so is installed there (append a
2540 // fake suffix hotspot/libjvm.so).
2541 const char *p = buf + strlen(buf) - 1;
2542 for (int count = 0; p > buf && count < 5; ++count) {
2543 for (--p; p > buf && *p != '/'; --p)
2544 /* empty */ ;
2545 }
2547 if (strncmp(p, "/jre/lib/", 9) != 0) {
2548 // Look for JAVA_HOME in the environment.
2549 char* java_home_var = ::getenv("JAVA_HOME");
2550 if (java_home_var != NULL && java_home_var[0] != 0) {
2551 char* jrelib_p;
2552 int len;
2554 // Check the current module name "libjvm.so" or "libjvm_g.so".
2555 p = strrchr(buf, '/');
2556 assert(strstr(p, "/libjvm") == p, "invalid library name");
2557 p = strstr(p, "_g") ? "_g" : "";
2559 rp = realpath(java_home_var, buf);
2560 if (rp == NULL)
2561 return;
2563 // determine if this is a legacy image or modules image
2564 // modules image doesn't have "jre" subdirectory
2565 len = strlen(buf);
2566 jrelib_p = buf + len;
2567 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2568 if (0 != access(buf, F_OK)) {
2569 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2570 }
2572 if (0 == access(buf, F_OK)) {
2573 // Use current module name "libjvm[_g].so" instead of
2574 // "libjvm"debug_only("_g")".so" since for fastdebug version
2575 // we should have "libjvm.so" but debug_only("_g") adds "_g"!
2576 len = strlen(buf);
2577 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p);
2578 } else {
2579 // Go back to path of .so
2580 rp = realpath(dli_fname, buf);
2581 if (rp == NULL)
2582 return;
2583 }
2584 }
2585 }
2586 }
2588 strcpy(saved_jvm_path, buf);
2589 }
2591 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2592 // no prefix required, not even "_"
2593 }
2595 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2596 // no suffix required
2597 }
2599 ////////////////////////////////////////////////////////////////////////////////
2600 // sun.misc.Signal support
2602 static volatile jint sigint_count = 0;
2604 static void
2605 UserHandler(int sig, void *siginfo, void *context) {
2606 // 4511530 - sem_post is serialized and handled by the manager thread. When
2607 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
2608 // don't want to flood the manager thread with sem_post requests.
2609 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
2610 return;
2612 // Ctrl-C is pressed during error reporting, likely because the error
2613 // handler fails to abort. Let VM die immediately.
2614 if (sig == SIGINT && is_error_reported()) {
2615 os::die();
2616 }
2618 os::signal_notify(sig);
2619 }
2621 void* os::user_handler() {
2622 return CAST_FROM_FN_PTR(void*, UserHandler);
2623 }
2625 extern "C" {
2626 typedef void (*sa_handler_t)(int);
2627 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2628 }
2630 void* os::signal(int signal_number, void* handler) {
2631 struct sigaction sigAct, oldSigAct;
2633 sigfillset(&(sigAct.sa_mask));
2634 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
2635 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2637 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2638 // -1 means registration failed
2639 return (void *)-1;
2640 }
2642 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2643 }
2645 void os::signal_raise(int signal_number) {
2646 ::raise(signal_number);
2647 }
2649 /*
2650 * The following code is moved from os.cpp for making this
2651 * code platform specific, which it is by its very nature.
2652 */
2654 // Will be modified when max signal is changed to be dynamic
2655 int os::sigexitnum_pd() {
2656 return NSIG;
2657 }
2659 // a counter for each possible signal value
2660 static volatile jint pending_signals[NSIG+1] = { 0 };
2662 // Bsd(POSIX) specific hand shaking semaphore.
2663 #ifdef __APPLE__
2664 static semaphore_t sig_sem;
2665 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
2666 #define SEM_WAIT(sem) semaphore_wait(sem);
2667 #define SEM_POST(sem) semaphore_signal(sem);
2668 #else
2669 static sem_t sig_sem;
2670 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
2671 #define SEM_WAIT(sem) sem_wait(&sem);
2672 #define SEM_POST(sem) sem_post(&sem);
2673 #endif
2675 void os::signal_init_pd() {
2676 // Initialize signal structures
2677 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2679 // Initialize signal semaphore
2680 ::SEM_INIT(sig_sem, 0);
2681 }
2683 void os::signal_notify(int sig) {
2684 Atomic::inc(&pending_signals[sig]);
2685 ::SEM_POST(sig_sem);
2686 }
2688 static int check_pending_signals(bool wait) {
2689 Atomic::store(0, &sigint_count);
2690 for (;;) {
2691 for (int i = 0; i < NSIG + 1; i++) {
2692 jint n = pending_signals[i];
2693 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2694 return i;
2695 }
2696 }
2697 if (!wait) {
2698 return -1;
2699 }
2700 JavaThread *thread = JavaThread::current();
2701 ThreadBlockInVM tbivm(thread);
2703 bool threadIsSuspended;
2704 do {
2705 thread->set_suspend_equivalent();
2706 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2707 ::SEM_WAIT(sig_sem);
2709 // were we externally suspended while we were waiting?
2710 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2711 if (threadIsSuspended) {
2712 //
2713 // The semaphore has been incremented, but while we were waiting
2714 // another thread suspended us. We don't want to continue running
2715 // while suspended because that would surprise the thread that
2716 // suspended us.
2717 //
2718 ::SEM_POST(sig_sem);
2720 thread->java_suspend_self();
2721 }
2722 } while (threadIsSuspended);
2723 }
2724 }
2726 int os::signal_lookup() {
2727 return check_pending_signals(false);
2728 }
2730 int os::signal_wait() {
2731 return check_pending_signals(true);
2732 }
2734 ////////////////////////////////////////////////////////////////////////////////
2735 // Virtual Memory
2737 int os::vm_page_size() {
2738 // Seems redundant as all get out
2739 assert(os::Bsd::page_size() != -1, "must call os::init");
2740 return os::Bsd::page_size();
2741 }
2743 // Solaris allocates memory by pages.
2744 int os::vm_allocation_granularity() {
2745 assert(os::Bsd::page_size() != -1, "must call os::init");
2746 return os::Bsd::page_size();
2747 }
2749 // Rationale behind this function:
2750 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2751 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2752 // samples for JITted code. Here we create private executable mapping over the code cache
2753 // and then we can use standard (well, almost, as mapping can change) way to provide
2754 // info for the reporting script by storing timestamp and location of symbol
2755 void bsd_wrap_code(char* base, size_t size) {
2756 static volatile jint cnt = 0;
2758 if (!UseOprofile) {
2759 return;
2760 }
2762 char buf[PATH_MAX + 1];
2763 int num = Atomic::add(1, &cnt);
2765 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2766 os::get_temp_directory(), os::current_process_id(), num);
2767 unlink(buf);
2769 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2771 if (fd != -1) {
2772 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2773 if (rv != (off_t)-1) {
2774 if (::write(fd, "", 1) == 1) {
2775 mmap(base, size,
2776 PROT_READ|PROT_WRITE|PROT_EXEC,
2777 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2778 }
2779 }
2780 ::close(fd);
2781 unlink(buf);
2782 }
2783 }
2785 // NOTE: Bsd kernel does not really reserve the pages for us.
2786 // All it does is to check if there are enough free pages
2787 // left at the time of mmap(). This could be a potential
2788 // problem.
2789 bool os::commit_memory(char* addr, size_t size, bool exec) {
2790 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2791 #ifdef __OpenBSD__
2792 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2793 return ::mprotect(addr, size, prot) == 0;
2794 #else
2795 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2796 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2797 return res != (uintptr_t) MAP_FAILED;
2798 #endif
2799 }
2801 #ifndef _ALLBSD_SOURCE
2802 // Define MAP_HUGETLB here so we can build HotSpot on old systems.
2803 #ifndef MAP_HUGETLB
2804 #define MAP_HUGETLB 0x40000
2805 #endif
2807 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems.
2808 #ifndef MADV_HUGEPAGE
2809 #define MADV_HUGEPAGE 14
2810 #endif
2811 #endif
2813 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2814 bool exec) {
2815 #ifndef _ALLBSD_SOURCE
2816 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
2817 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2818 uintptr_t res =
2819 (uintptr_t) ::mmap(addr, size, prot,
2820 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB,
2821 -1, 0);
2822 return res != (uintptr_t) MAP_FAILED;
2823 }
2824 #endif
2826 return commit_memory(addr, size, exec);
2827 }
2829 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2830 #ifndef _ALLBSD_SOURCE
2831 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
2832 // We don't check the return value: madvise(MADV_HUGEPAGE) may not
2833 // be supported or the memory may already be backed by huge pages.
2834 ::madvise(addr, bytes, MADV_HUGEPAGE);
2835 }
2836 #endif
2837 }
2839 void os::free_memory(char *addr, size_t bytes) {
2840 ::madvise(addr, bytes, MADV_DONTNEED);
2841 }
2843 void os::numa_make_global(char *addr, size_t bytes) {
2844 }
2846 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2847 }
2849 bool os::numa_topology_changed() { return false; }
2851 size_t os::numa_get_groups_num() {
2852 return 1;
2853 }
2855 int os::numa_get_group_id() {
2856 return 0;
2857 }
2859 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2860 if (size > 0) {
2861 ids[0] = 0;
2862 return 1;
2863 }
2864 return 0;
2865 }
2867 bool os::get_page_info(char *start, page_info* info) {
2868 return false;
2869 }
2871 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2872 return end;
2873 }
2875 #ifndef _ALLBSD_SOURCE
2876 // Something to do with the numa-aware allocator needs these symbols
2877 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { }
2878 extern "C" JNIEXPORT void numa_error(char *where) { }
2879 extern "C" JNIEXPORT int fork1() { return fork(); }
2882 // If we are running with libnuma version > 2, then we should
2883 // be trying to use symbols with versions 1.1
2884 // If we are running with earlier version, which did not have symbol versions,
2885 // we should use the base version.
2886 void* os::Bsd::libnuma_dlsym(void* handle, const char *name) {
2887 void *f = dlvsym(handle, name, "libnuma_1.1");
2888 if (f == NULL) {
2889 f = dlsym(handle, name);
2890 }
2891 return f;
2892 }
2894 bool os::Bsd::libnuma_init() {
2895 // sched_getcpu() should be in libc.
2896 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t,
2897 dlsym(RTLD_DEFAULT, "sched_getcpu")));
2899 if (sched_getcpu() != -1) { // Does it work?
2900 void *handle = dlopen("libnuma.so.1", RTLD_LAZY);
2901 if (handle != NULL) {
2902 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t,
2903 libnuma_dlsym(handle, "numa_node_to_cpus")));
2904 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t,
2905 libnuma_dlsym(handle, "numa_max_node")));
2906 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t,
2907 libnuma_dlsym(handle, "numa_available")));
2908 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t,
2909 libnuma_dlsym(handle, "numa_tonode_memory")));
2910 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t,
2911 libnuma_dlsym(handle, "numa_interleave_memory")));
2914 if (numa_available() != -1) {
2915 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes"));
2916 // Create a cpu -> node mapping
2917 _cpu_to_node = new (ResourceObj::C_HEAP) GrowableArray<int>(0, true);
2918 rebuild_cpu_to_node_map();
2919 return true;
2920 }
2921 }
2922 }
2923 return false;
2924 }
2926 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id.
2927 // The table is later used in get_node_by_cpu().
2928 void os::Bsd::rebuild_cpu_to_node_map() {
2929 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure
2930 // in libnuma (possible values are starting from 16,
2931 // and continuing up with every other power of 2, but less
2932 // than the maximum number of CPUs supported by kernel), and
2933 // is a subject to change (in libnuma version 2 the requirements
2934 // are more reasonable) we'll just hardcode the number they use
2935 // in the library.
2936 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT;
2938 size_t cpu_num = os::active_processor_count();
2939 size_t cpu_map_size = NCPUS / BitsPerCLong;
2940 size_t cpu_map_valid_size =
2941 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size);
2943 cpu_to_node()->clear();
2944 cpu_to_node()->at_grow(cpu_num - 1);
2945 size_t node_num = numa_get_groups_num();
2947 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size);
2948 for (size_t i = 0; i < node_num; i++) {
2949 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) {
2950 for (size_t j = 0; j < cpu_map_valid_size; j++) {
2951 if (cpu_map[j] != 0) {
2952 for (size_t k = 0; k < BitsPerCLong; k++) {
2953 if (cpu_map[j] & (1UL << k)) {
2954 cpu_to_node()->at_put(j * BitsPerCLong + k, i);
2955 }
2956 }
2957 }
2958 }
2959 }
2960 }
2961 FREE_C_HEAP_ARRAY(unsigned long, cpu_map);
2962 }
2964 int os::Bsd::get_node_by_cpu(int cpu_id) {
2965 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) {
2966 return cpu_to_node()->at(cpu_id);
2967 }
2968 return -1;
2969 }
2971 GrowableArray<int>* os::Bsd::_cpu_to_node;
2972 os::Bsd::sched_getcpu_func_t os::Bsd::_sched_getcpu;
2973 os::Bsd::numa_node_to_cpus_func_t os::Bsd::_numa_node_to_cpus;
2974 os::Bsd::numa_max_node_func_t os::Bsd::_numa_max_node;
2975 os::Bsd::numa_available_func_t os::Bsd::_numa_available;
2976 os::Bsd::numa_tonode_memory_func_t os::Bsd::_numa_tonode_memory;
2977 os::Bsd::numa_interleave_memory_func_t os::Bsd::_numa_interleave_memory;
2978 unsigned long* os::Bsd::_numa_all_nodes;
2979 #endif
2981 bool os::uncommit_memory(char* addr, size_t size) {
2982 #ifdef __OpenBSD__
2983 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2984 return ::mprotect(addr, size, PROT_NONE) == 0;
2985 #else
2986 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2987 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2988 return res != (uintptr_t) MAP_FAILED;
2989 #endif
2990 }
2992 bool os::create_stack_guard_pages(char* addr, size_t size) {
2993 return os::commit_memory(addr, size);
2994 }
2996 // If this is a growable mapping, remove the guard pages entirely by
2997 // munmap()ping them. If not, just call uncommit_memory().
2998 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2999 return os::uncommit_memory(addr, size);
3000 }
3002 static address _highest_vm_reserved_address = NULL;
3004 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
3005 // at 'requested_addr'. If there are existing memory mappings at the same
3006 // location, however, they will be overwritten. If 'fixed' is false,
3007 // 'requested_addr' is only treated as a hint, the return value may or
3008 // may not start from the requested address. Unlike Bsd mmap(), this
3009 // function returns NULL to indicate failure.
3010 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
3011 char * addr;
3012 int flags;
3014 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
3015 if (fixed) {
3016 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
3017 flags |= MAP_FIXED;
3018 }
3020 // Map uncommitted pages PROT_READ and PROT_WRITE, change access
3021 // to PROT_EXEC if executable when we commit the page.
3022 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE,
3023 flags, -1, 0);
3025 if (addr != MAP_FAILED) {
3026 // anon_mmap() should only get called during VM initialization,
3027 // don't need lock (actually we can skip locking even it can be called
3028 // from multiple threads, because _highest_vm_reserved_address is just a
3029 // hint about the upper limit of non-stack memory regions.)
3030 if ((address)addr + bytes > _highest_vm_reserved_address) {
3031 _highest_vm_reserved_address = (address)addr + bytes;
3032 }
3033 }
3035 return addr == MAP_FAILED ? NULL : addr;
3036 }
3038 // Don't update _highest_vm_reserved_address, because there might be memory
3039 // regions above addr + size. If so, releasing a memory region only creates
3040 // a hole in the address space, it doesn't help prevent heap-stack collision.
3041 //
3042 static int anon_munmap(char * addr, size_t size) {
3043 return ::munmap(addr, size) == 0;
3044 }
3046 char* os::reserve_memory(size_t bytes, char* requested_addr,
3047 size_t alignment_hint) {
3048 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
3049 }
3051 bool os::release_memory(char* addr, size_t size) {
3052 return anon_munmap(addr, size);
3053 }
3055 static address highest_vm_reserved_address() {
3056 return _highest_vm_reserved_address;
3057 }
3059 static bool bsd_mprotect(char* addr, size_t size, int prot) {
3060 // Bsd wants the mprotect address argument to be page aligned.
3061 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
3063 // According to SUSv3, mprotect() should only be used with mappings
3064 // established by mmap(), and mmap() always maps whole pages. Unaligned
3065 // 'addr' likely indicates problem in the VM (e.g. trying to change
3066 // protection of malloc'ed or statically allocated memory). Check the
3067 // caller if you hit this assert.
3068 assert(addr == bottom, "sanity check");
3070 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
3071 return ::mprotect(bottom, size, prot) == 0;
3072 }
3074 // Set protections specified
3075 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3076 bool is_committed) {
3077 unsigned int p = 0;
3078 switch (prot) {
3079 case MEM_PROT_NONE: p = PROT_NONE; break;
3080 case MEM_PROT_READ: p = PROT_READ; break;
3081 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3082 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3083 default:
3084 ShouldNotReachHere();
3085 }
3086 // is_committed is unused.
3087 return bsd_mprotect(addr, bytes, p);
3088 }
3090 bool os::guard_memory(char* addr, size_t size) {
3091 return bsd_mprotect(addr, size, PROT_NONE);
3092 }
3094 bool os::unguard_memory(char* addr, size_t size) {
3095 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
3096 }
3098 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
3099 bool result = false;
3100 #ifndef _ALLBSD_SOURCE
3101 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE,
3102 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB,
3103 -1, 0);
3105 if (p != (void *) -1) {
3106 // We don't know if this really is a huge page or not.
3107 FILE *fp = fopen("/proc/self/maps", "r");
3108 if (fp) {
3109 while (!feof(fp)) {
3110 char chars[257];
3111 long x = 0;
3112 if (fgets(chars, sizeof(chars), fp)) {
3113 if (sscanf(chars, "%lx-%*x", &x) == 1
3114 && x == (long)p) {
3115 if (strstr (chars, "hugepage")) {
3116 result = true;
3117 break;
3118 }
3119 }
3120 }
3121 }
3122 fclose(fp);
3123 }
3124 munmap (p, page_size);
3125 if (result)
3126 return true;
3127 }
3129 if (warn) {
3130 warning("HugeTLBFS is not supported by the operating system.");
3131 }
3132 #endif
3134 return result;
3135 }
3137 /*
3138 * Set the coredump_filter bits to include largepages in core dump (bit 6)
3139 *
3140 * From the coredump_filter documentation:
3141 *
3142 * - (bit 0) anonymous private memory
3143 * - (bit 1) anonymous shared memory
3144 * - (bit 2) file-backed private memory
3145 * - (bit 3) file-backed shared memory
3146 * - (bit 4) ELF header pages in file-backed private memory areas (it is
3147 * effective only if the bit 2 is cleared)
3148 * - (bit 5) hugetlb private memory
3149 * - (bit 6) hugetlb shared memory
3150 */
3151 static void set_coredump_filter(void) {
3152 FILE *f;
3153 long cdm;
3155 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
3156 return;
3157 }
3159 if (fscanf(f, "%lx", &cdm) != 1) {
3160 fclose(f);
3161 return;
3162 }
3164 rewind(f);
3166 if ((cdm & LARGEPAGES_BIT) == 0) {
3167 cdm |= LARGEPAGES_BIT;
3168 fprintf(f, "%#lx", cdm);
3169 }
3171 fclose(f);
3172 }
3174 // Large page support
3176 static size_t _large_page_size = 0;
3178 void os::large_page_init() {
3179 #ifndef _ALLBSD_SOURCE
3180 if (!UseLargePages) {
3181 UseHugeTLBFS = false;
3182 UseSHM = false;
3183 return;
3184 }
3186 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) {
3187 // If UseLargePages is specified on the command line try both methods,
3188 // if it's default, then try only HugeTLBFS.
3189 if (FLAG_IS_DEFAULT(UseLargePages)) {
3190 UseHugeTLBFS = true;
3191 } else {
3192 UseHugeTLBFS = UseSHM = true;
3193 }
3194 }
3196 if (LargePageSizeInBytes) {
3197 _large_page_size = LargePageSizeInBytes;
3198 } else {
3199 // large_page_size on Bsd is used to round up heap size. x86 uses either
3200 // 2M or 4M page, depending on whether PAE (Physical Address Extensions)
3201 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use
3202 // page as large as 256M.
3203 //
3204 // Here we try to figure out page size by parsing /proc/meminfo and looking
3205 // for a line with the following format:
3206 // Hugepagesize: 2048 kB
3207 //
3208 // If we can't determine the value (e.g. /proc is not mounted, or the text
3209 // format has been changed), we'll use the largest page size supported by
3210 // the processor.
3212 #ifndef ZERO
3213 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M)
3214 ARM_ONLY(2 * M) PPC_ONLY(4 * M);
3215 #endif // ZERO
3217 FILE *fp = fopen("/proc/meminfo", "r");
3218 if (fp) {
3219 while (!feof(fp)) {
3220 int x = 0;
3221 char buf[16];
3222 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) {
3223 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) {
3224 _large_page_size = x * K;
3225 break;
3226 }
3227 } else {
3228 // skip to next line
3229 for (;;) {
3230 int ch = fgetc(fp);
3231 if (ch == EOF || ch == (int)'\n') break;
3232 }
3233 }
3234 }
3235 fclose(fp);
3236 }
3237 }
3239 // print a warning if any large page related flag is specified on command line
3240 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS);
3242 const size_t default_page_size = (size_t)Bsd::page_size();
3243 if (_large_page_size > default_page_size) {
3244 _page_sizes[0] = _large_page_size;
3245 _page_sizes[1] = default_page_size;
3246 _page_sizes[2] = 0;
3247 }
3248 UseHugeTLBFS = UseHugeTLBFS &&
3249 Bsd::hugetlbfs_sanity_check(warn_on_failure, _large_page_size);
3251 if (UseHugeTLBFS)
3252 UseSHM = false;
3254 UseLargePages = UseHugeTLBFS || UseSHM;
3256 set_coredump_filter();
3257 #endif
3258 }
3260 #ifndef _ALLBSD_SOURCE
3261 #ifndef SHM_HUGETLB
3262 #define SHM_HUGETLB 04000
3263 #endif
3264 #endif
3266 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) {
3267 // "exec" is passed in but not used. Creating the shared image for
3268 // the code cache doesn't have an SHM_X executable permission to check.
3269 assert(UseLargePages && UseSHM, "only for SHM large pages");
3271 key_t key = IPC_PRIVATE;
3272 char *addr;
3274 bool warn_on_failure = UseLargePages &&
3275 (!FLAG_IS_DEFAULT(UseLargePages) ||
3276 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3277 );
3278 char msg[128];
3280 // Create a large shared memory region to attach to based on size.
3281 // Currently, size is the total size of the heap
3282 #ifndef _ALLBSD_SOURCE
3283 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W);
3284 #else
3285 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
3286 #endif
3287 if (shmid == -1) {
3288 // Possible reasons for shmget failure:
3289 // 1. shmmax is too small for Java heap.
3290 // > check shmmax value: cat /proc/sys/kernel/shmmax
3291 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
3292 // 2. not enough large page memory.
3293 // > check available large pages: cat /proc/meminfo
3294 // > increase amount of large pages:
3295 // echo new_value > /proc/sys/vm/nr_hugepages
3296 // Note 1: different Bsd may use different name for this property,
3297 // e.g. on Redhat AS-3 it is "hugetlb_pool".
3298 // Note 2: it's possible there's enough physical memory available but
3299 // they are so fragmented after a long run that they can't
3300 // coalesce into large pages. Try to reserve large pages when
3301 // the system is still "fresh".
3302 if (warn_on_failure) {
3303 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3304 warning(msg);
3305 }
3306 return NULL;
3307 }
3309 // attach to the region
3310 addr = (char*)shmat(shmid, req_addr, 0);
3311 int err = errno;
3313 // Remove shmid. If shmat() is successful, the actual shared memory segment
3314 // will be deleted when it's detached by shmdt() or when the process
3315 // terminates. If shmat() is not successful this will remove the shared
3316 // segment immediately.
3317 shmctl(shmid, IPC_RMID, NULL);
3319 if ((intptr_t)addr == -1) {
3320 if (warn_on_failure) {
3321 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3322 warning(msg);
3323 }
3324 return NULL;
3325 }
3327 return addr;
3328 }
3330 bool os::release_memory_special(char* base, size_t bytes) {
3331 // detaching the SHM segment will also delete it, see reserve_memory_special()
3332 int rslt = shmdt(base);
3333 return rslt == 0;
3334 }
3336 size_t os::large_page_size() {
3337 return _large_page_size;
3338 }
3340 // HugeTLBFS allows application to commit large page memory on demand;
3341 // with SysV SHM the entire memory region must be allocated as shared
3342 // memory.
3343 bool os::can_commit_large_page_memory() {
3344 return UseHugeTLBFS;
3345 }
3347 bool os::can_execute_large_page_memory() {
3348 return UseHugeTLBFS;
3349 }
3351 // Reserve memory at an arbitrary address, only if that area is
3352 // available (and not reserved for something else).
3354 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3355 const int max_tries = 10;
3356 char* base[max_tries];
3357 size_t size[max_tries];
3358 const size_t gap = 0x000000;
3360 // Assert only that the size is a multiple of the page size, since
3361 // that's all that mmap requires, and since that's all we really know
3362 // about at this low abstraction level. If we need higher alignment,
3363 // we can either pass an alignment to this method or verify alignment
3364 // in one of the methods further up the call chain. See bug 5044738.
3365 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3367 // Repeatedly allocate blocks until the block is allocated at the
3368 // right spot. Give up after max_tries. Note that reserve_memory() will
3369 // automatically update _highest_vm_reserved_address if the call is
3370 // successful. The variable tracks the highest memory address every reserved
3371 // by JVM. It is used to detect heap-stack collision if running with
3372 // fixed-stack BsdThreads. Because here we may attempt to reserve more
3373 // space than needed, it could confuse the collision detecting code. To
3374 // solve the problem, save current _highest_vm_reserved_address and
3375 // calculate the correct value before return.
3376 address old_highest = _highest_vm_reserved_address;
3378 // Bsd mmap allows caller to pass an address as hint; give it a try first,
3379 // if kernel honors the hint then we can return immediately.
3380 char * addr = anon_mmap(requested_addr, bytes, false);
3381 if (addr == requested_addr) {
3382 return requested_addr;
3383 }
3385 if (addr != NULL) {
3386 // mmap() is successful but it fails to reserve at the requested address
3387 anon_munmap(addr, bytes);
3388 }
3390 int i;
3391 for (i = 0; i < max_tries; ++i) {
3392 base[i] = reserve_memory(bytes);
3394 if (base[i] != NULL) {
3395 // Is this the block we wanted?
3396 if (base[i] == requested_addr) {
3397 size[i] = bytes;
3398 break;
3399 }
3401 // Does this overlap the block we wanted? Give back the overlapped
3402 // parts and try again.
3404 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3405 if (top_overlap >= 0 && top_overlap < bytes) {
3406 unmap_memory(base[i], top_overlap);
3407 base[i] += top_overlap;
3408 size[i] = bytes - top_overlap;
3409 } else {
3410 size_t bottom_overlap = base[i] + bytes - requested_addr;
3411 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3412 unmap_memory(requested_addr, bottom_overlap);
3413 size[i] = bytes - bottom_overlap;
3414 } else {
3415 size[i] = bytes;
3416 }
3417 }
3418 }
3419 }
3421 // Give back the unused reserved pieces.
3423 for (int j = 0; j < i; ++j) {
3424 if (base[j] != NULL) {
3425 unmap_memory(base[j], size[j]);
3426 }
3427 }
3429 if (i < max_tries) {
3430 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes);
3431 return requested_addr;
3432 } else {
3433 _highest_vm_reserved_address = old_highest;
3434 return NULL;
3435 }
3436 }
3438 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3439 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
3440 }
3442 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation.
3443 // Solaris uses poll(), bsd uses park().
3444 // Poll() is likely a better choice, assuming that Thread.interrupt()
3445 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with
3446 // SIGSEGV, see 4355769.
3448 const int NANOSECS_PER_MILLISECS = 1000000;
3450 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3451 assert(thread == Thread::current(), "thread consistency check");
3453 ParkEvent * const slp = thread->_SleepEvent ;
3454 slp->reset() ;
3455 OrderAccess::fence() ;
3457 if (interruptible) {
3458 jlong prevtime = javaTimeNanos();
3460 for (;;) {
3461 if (os::is_interrupted(thread, true)) {
3462 return OS_INTRPT;
3463 }
3465 jlong newtime = javaTimeNanos();
3467 if (newtime - prevtime < 0) {
3468 // time moving backwards, should only happen if no monotonic clock
3469 // not a guarantee() because JVM should not abort on kernel/glibc bugs
3470 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
3471 } else {
3472 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS;
3473 }
3475 if(millis <= 0) {
3476 return OS_OK;
3477 }
3479 prevtime = newtime;
3481 {
3482 assert(thread->is_Java_thread(), "sanity check");
3483 JavaThread *jt = (JavaThread *) thread;
3484 ThreadBlockInVM tbivm(jt);
3485 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3487 jt->set_suspend_equivalent();
3488 // cleared by handle_special_suspend_equivalent_condition() or
3489 // java_suspend_self() via check_and_wait_while_suspended()
3491 slp->park(millis);
3493 // were we externally suspended while we were waiting?
3494 jt->check_and_wait_while_suspended();
3495 }
3496 }
3497 } else {
3498 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3499 jlong prevtime = javaTimeNanos();
3501 for (;;) {
3502 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
3503 // the 1st iteration ...
3504 jlong newtime = javaTimeNanos();
3506 if (newtime - prevtime < 0) {
3507 // time moving backwards, should only happen if no monotonic clock
3508 // not a guarantee() because JVM should not abort on kernel/glibc bugs
3509 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
3510 } else {
3511 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISECS;
3512 }
3514 if(millis <= 0) break ;
3516 prevtime = newtime;
3517 slp->park(millis);
3518 }
3519 return OS_OK ;
3520 }
3521 }
3523 int os::naked_sleep() {
3524 // %% make the sleep time an integer flag. for now use 1 millisec.
3525 return os::sleep(Thread::current(), 1, false);
3526 }
3528 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3529 void os::infinite_sleep() {
3530 while (true) { // sleep forever ...
3531 ::sleep(100); // ... 100 seconds at a time
3532 }
3533 }
3535 // Used to convert frequent JVM_Yield() to nops
3536 bool os::dont_yield() {
3537 return DontYieldALot;
3538 }
3540 void os::yield() {
3541 sched_yield();
3542 }
3544 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;}
3546 void os::yield_all(int attempts) {
3547 // Yields to all threads, including threads with lower priorities
3548 // Threads on Bsd are all with same priority. The Solaris style
3549 // os::yield_all() with nanosleep(1ms) is not necessary.
3550 sched_yield();
3551 }
3553 // Called from the tight loops to possibly influence time-sharing heuristics
3554 void os::loop_breaker(int attempts) {
3555 os::yield_all(attempts);
3556 }
3558 ////////////////////////////////////////////////////////////////////////////////
3559 // thread priority support
3561 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
3562 // only supports dynamic priority, static priority must be zero. For real-time
3563 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
3564 // However, for large multi-threaded applications, SCHED_RR is not only slower
3565 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
3566 // of 5 runs - Sep 2005).
3567 //
3568 // The following code actually changes the niceness of kernel-thread/LWP. It
3569 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
3570 // not the entire user process, and user level threads are 1:1 mapped to kernel
3571 // threads. It has always been the case, but could change in the future. For
3572 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
3573 // It is only used when ThreadPriorityPolicy=1 and requires root privilege.
3575 #if defined(_ALLBSD_SOURCE) && !defined(__APPLE__)
3576 int os::java_to_os_priority[MaxPriority + 1] = {
3577 19, // 0 Entry should never be used
3579 0, // 1 MinPriority
3580 3, // 2
3581 6, // 3
3583 10, // 4
3584 15, // 5 NormPriority
3585 18, // 6
3587 21, // 7
3588 25, // 8
3589 28, // 9 NearMaxPriority
3591 31 // 10 MaxPriority
3592 };
3593 #elif defined(__APPLE__)
3594 /* Using Mach high-level priority assignments */
3595 int os::java_to_os_priority[MaxPriority + 1] = {
3596 0, // 0 Entry should never be used (MINPRI_USER)
3598 27, // 1 MinPriority
3599 28, // 2
3600 29, // 3
3602 30, // 4
3603 31, // 5 NormPriority (BASEPRI_DEFAULT)
3604 32, // 6
3606 33, // 7
3607 34, // 8
3608 35, // 9 NearMaxPriority
3610 36 // 10 MaxPriority
3611 };
3612 #else
3613 int os::java_to_os_priority[MaxPriority + 1] = {
3614 19, // 0 Entry should never be used
3616 4, // 1 MinPriority
3617 3, // 2
3618 2, // 3
3620 1, // 4
3621 0, // 5 NormPriority
3622 -1, // 6
3624 -2, // 7
3625 -3, // 8
3626 -4, // 9 NearMaxPriority
3628 -5 // 10 MaxPriority
3629 };
3630 #endif
3632 static int prio_init() {
3633 if (ThreadPriorityPolicy == 1) {
3634 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1
3635 // if effective uid is not root. Perhaps, a more elegant way of doing
3636 // this is to test CAP_SYS_NICE capability, but that will require libcap.so
3637 if (geteuid() != 0) {
3638 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
3639 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd");
3640 }
3641 ThreadPriorityPolicy = 0;
3642 }
3643 }
3644 return 0;
3645 }
3647 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3648 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK;
3650 #ifdef __OpenBSD__
3651 // OpenBSD pthread_setprio starves low priority threads
3652 return OS_OK;
3653 #elif defined(__FreeBSD__)
3654 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
3655 #elif defined(__APPLE__) || defined(__NetBSD__)
3656 struct sched_param sp;
3657 int policy;
3658 pthread_t self = pthread_self();
3660 if (pthread_getschedparam(self, &policy, &sp) != 0)
3661 return OS_ERR;
3663 sp.sched_priority = newpri;
3664 if (pthread_setschedparam(self, policy, &sp) != 0)
3665 return OS_ERR;
3667 return OS_OK;
3668 #else
3669 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
3670 return (ret == 0) ? OS_OK : OS_ERR;
3671 #endif
3672 }
3674 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3675 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) {
3676 *priority_ptr = java_to_os_priority[NormPriority];
3677 return OS_OK;
3678 }
3680 errno = 0;
3681 #if defined(__OpenBSD__) || defined(__FreeBSD__)
3682 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
3683 #elif defined(__APPLE__) || defined(__NetBSD__)
3684 int policy;
3685 struct sched_param sp;
3687 pthread_getschedparam(pthread_self(), &policy, &sp);
3688 *priority_ptr = sp.sched_priority;
3689 #else
3690 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
3691 #endif
3692 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
3693 }
3695 // Hint to the underlying OS that a task switch would not be good.
3696 // Void return because it's a hint and can fail.
3697 void os::hint_no_preempt() {}
3699 ////////////////////////////////////////////////////////////////////////////////
3700 // suspend/resume support
3702 // the low-level signal-based suspend/resume support is a remnant from the
3703 // old VM-suspension that used to be for java-suspension, safepoints etc,
3704 // within hotspot. Now there is a single use-case for this:
3705 // - calling get_thread_pc() on the VMThread by the flat-profiler task
3706 // that runs in the watcher thread.
3707 // The remaining code is greatly simplified from the more general suspension
3708 // code that used to be used.
3709 //
3710 // The protocol is quite simple:
3711 // - suspend:
3712 // - sends a signal to the target thread
3713 // - polls the suspend state of the osthread using a yield loop
3714 // - target thread signal handler (SR_handler) sets suspend state
3715 // and blocks in sigsuspend until continued
3716 // - resume:
3717 // - sets target osthread state to continue
3718 // - sends signal to end the sigsuspend loop in the SR_handler
3719 //
3720 // Note that the SR_lock plays no role in this suspend/resume protocol.
3721 //
3723 static void resume_clear_context(OSThread *osthread) {
3724 osthread->set_ucontext(NULL);
3725 osthread->set_siginfo(NULL);
3727 // notify the suspend action is completed, we have now resumed
3728 osthread->sr.clear_suspended();
3729 }
3731 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
3732 osthread->set_ucontext(context);
3733 osthread->set_siginfo(siginfo);
3734 }
3736 //
3737 // Handler function invoked when a thread's execution is suspended or
3738 // resumed. We have to be careful that only async-safe functions are
3739 // called here (Note: most pthread functions are not async safe and
3740 // should be avoided.)
3741 //
3742 // Note: sigwait() is a more natural fit than sigsuspend() from an
3743 // interface point of view, but sigwait() prevents the signal hander
3744 // from being run. libpthread would get very confused by not having
3745 // its signal handlers run and prevents sigwait()'s use with the
3746 // mutex granting granting signal.
3747 //
3748 // Currently only ever called on the VMThread
3749 //
3750 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
3751 // Save and restore errno to avoid confusing native code with EINTR
3752 // after sigsuspend.
3753 int old_errno = errno;
3755 Thread* thread = Thread::current();
3756 OSThread* osthread = thread->osthread();
3757 assert(thread->is_VM_thread(), "Must be VMThread");
3758 // read current suspend action
3759 int action = osthread->sr.suspend_action();
3760 if (action == SR_SUSPEND) {
3761 suspend_save_context(osthread, siginfo, context);
3763 // Notify the suspend action is about to be completed. do_suspend()
3764 // waits until SR_SUSPENDED is set and then returns. We will wait
3765 // here for a resume signal and that completes the suspend-other
3766 // action. do_suspend/do_resume is always called as a pair from
3767 // the same thread - so there are no races
3769 // notify the caller
3770 osthread->sr.set_suspended();
3772 sigset_t suspend_set; // signals for sigsuspend()
3774 // get current set of blocked signals and unblock resume signal
3775 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3776 sigdelset(&suspend_set, SR_signum);
3778 // wait here until we are resumed
3779 do {
3780 sigsuspend(&suspend_set);
3781 // ignore all returns until we get a resume signal
3782 } while (osthread->sr.suspend_action() != SR_CONTINUE);
3784 resume_clear_context(osthread);
3786 } else {
3787 assert(action == SR_CONTINUE, "unexpected sr action");
3788 // nothing special to do - just leave the handler
3789 }
3791 errno = old_errno;
3792 }
3795 static int SR_initialize() {
3796 struct sigaction act;
3797 char *s;
3798 /* Get signal number to use for suspend/resume */
3799 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
3800 int sig = ::strtol(s, 0, 10);
3801 if (sig > 0 || sig < NSIG) {
3802 SR_signum = sig;
3803 }
3804 }
3806 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
3807 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
3809 sigemptyset(&SR_sigset);
3810 sigaddset(&SR_sigset, SR_signum);
3812 /* Set up signal handler for suspend/resume */
3813 act.sa_flags = SA_RESTART|SA_SIGINFO;
3814 act.sa_handler = (void (*)(int)) SR_handler;
3816 // SR_signum is blocked by default.
3817 // 4528190 - We also need to block pthread restart signal (32 on all
3818 // supported Bsd platforms). Note that BsdThreads need to block
3819 // this signal for all threads to work properly. So we don't have
3820 // to use hard-coded signal number when setting up the mask.
3821 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
3823 if (sigaction(SR_signum, &act, 0) == -1) {
3824 return -1;
3825 }
3827 // Save signal flag
3828 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
3829 return 0;
3830 }
3832 static int SR_finalize() {
3833 return 0;
3834 }
3837 // returns true on success and false on error - really an error is fatal
3838 // but this seems the normal response to library errors
3839 static bool do_suspend(OSThread* osthread) {
3840 // mark as suspended and send signal
3841 osthread->sr.set_suspend_action(SR_SUSPEND);
3842 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3843 assert_status(status == 0, status, "pthread_kill");
3845 // check status and wait until notified of suspension
3846 if (status == 0) {
3847 for (int i = 0; !osthread->sr.is_suspended(); i++) {
3848 os::yield_all(i);
3849 }
3850 osthread->sr.set_suspend_action(SR_NONE);
3851 return true;
3852 }
3853 else {
3854 osthread->sr.set_suspend_action(SR_NONE);
3855 return false;
3856 }
3857 }
3859 static void do_resume(OSThread* osthread) {
3860 assert(osthread->sr.is_suspended(), "thread should be suspended");
3861 osthread->sr.set_suspend_action(SR_CONTINUE);
3863 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3864 assert_status(status == 0, status, "pthread_kill");
3865 // check status and wait unit notified of resumption
3866 if (status == 0) {
3867 for (int i = 0; osthread->sr.is_suspended(); i++) {
3868 os::yield_all(i);
3869 }
3870 }
3871 osthread->sr.set_suspend_action(SR_NONE);
3872 }
3874 ////////////////////////////////////////////////////////////////////////////////
3875 // interrupt support
3877 void os::interrupt(Thread* thread) {
3878 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
3879 "possibility of dangling Thread pointer");
3881 OSThread* osthread = thread->osthread();
3883 if (!osthread->interrupted()) {
3884 osthread->set_interrupted(true);
3885 // More than one thread can get here with the same value of osthread,
3886 // resulting in multiple notifications. We do, however, want the store
3887 // to interrupted() to be visible to other threads before we execute unpark().
3888 OrderAccess::fence();
3889 ParkEvent * const slp = thread->_SleepEvent ;
3890 if (slp != NULL) slp->unpark() ;
3891 }
3893 // For JSR166. Unpark even if interrupt status already was set
3894 if (thread->is_Java_thread())
3895 ((JavaThread*)thread)->parker()->unpark();
3897 ParkEvent * ev = thread->_ParkEvent ;
3898 if (ev != NULL) ev->unpark() ;
3900 }
3902 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3903 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
3904 "possibility of dangling Thread pointer");
3906 OSThread* osthread = thread->osthread();
3908 bool interrupted = osthread->interrupted();
3910 if (interrupted && clear_interrupted) {
3911 osthread->set_interrupted(false);
3912 // consider thread->_SleepEvent->reset() ... optional optimization
3913 }
3915 return interrupted;
3916 }
3918 ///////////////////////////////////////////////////////////////////////////////////
3919 // signal handling (except suspend/resume)
3921 // This routine may be used by user applications as a "hook" to catch signals.
3922 // The user-defined signal handler must pass unrecognized signals to this
3923 // routine, and if it returns true (non-zero), then the signal handler must
3924 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3925 // routine will never retun false (zero), but instead will execute a VM panic
3926 // routine kill the process.
3927 //
3928 // If this routine returns false, it is OK to call it again. This allows
3929 // the user-defined signal handler to perform checks either before or after
3930 // the VM performs its own checks. Naturally, the user code would be making
3931 // a serious error if it tried to handle an exception (such as a null check
3932 // or breakpoint) that the VM was generating for its own correct operation.
3933 //
3934 // This routine may recognize any of the following kinds of signals:
3935 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3936 // It should be consulted by handlers for any of those signals.
3937 //
3938 // The caller of this routine must pass in the three arguments supplied
3939 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3940 // field of the structure passed to sigaction(). This routine assumes that
3941 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3942 //
3943 // Note that the VM will print warnings if it detects conflicting signal
3944 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3945 //
3946 extern "C" JNIEXPORT int
3947 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
3948 void* ucontext, int abort_if_unrecognized);
3950 void signalHandler(int sig, siginfo_t* info, void* uc) {
3951 assert(info != NULL && uc != NULL, "it must be old kernel");
3952 JVM_handle_bsd_signal(sig, info, uc, true);
3953 }
3956 // This boolean allows users to forward their own non-matching signals
3957 // to JVM_handle_bsd_signal, harmlessly.
3958 bool os::Bsd::signal_handlers_are_installed = false;
3960 // For signal-chaining
3961 struct sigaction os::Bsd::sigact[MAXSIGNUM];
3962 unsigned int os::Bsd::sigs = 0;
3963 bool os::Bsd::libjsig_is_loaded = false;
3964 typedef struct sigaction *(*get_signal_t)(int);
3965 get_signal_t os::Bsd::get_signal_action = NULL;
3967 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
3968 struct sigaction *actp = NULL;
3970 if (libjsig_is_loaded) {
3971 // Retrieve the old signal handler from libjsig
3972 actp = (*get_signal_action)(sig);
3973 }
3974 if (actp == NULL) {
3975 // Retrieve the preinstalled signal handler from jvm
3976 actp = get_preinstalled_handler(sig);
3977 }
3979 return actp;
3980 }
3982 static bool call_chained_handler(struct sigaction *actp, int sig,
3983 siginfo_t *siginfo, void *context) {
3984 // Call the old signal handler
3985 if (actp->sa_handler == SIG_DFL) {
3986 // It's more reasonable to let jvm treat it as an unexpected exception
3987 // instead of taking the default action.
3988 return false;
3989 } else if (actp->sa_handler != SIG_IGN) {
3990 if ((actp->sa_flags & SA_NODEFER) == 0) {
3991 // automaticlly block the signal
3992 sigaddset(&(actp->sa_mask), sig);
3993 }
3995 sa_handler_t hand;
3996 sa_sigaction_t sa;
3997 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3998 // retrieve the chained handler
3999 if (siginfo_flag_set) {
4000 sa = actp->sa_sigaction;
4001 } else {
4002 hand = actp->sa_handler;
4003 }
4005 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4006 actp->sa_handler = SIG_DFL;
4007 }
4009 // try to honor the signal mask
4010 sigset_t oset;
4011 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4013 // call into the chained handler
4014 if (siginfo_flag_set) {
4015 (*sa)(sig, siginfo, context);
4016 } else {
4017 (*hand)(sig);
4018 }
4020 // restore the signal mask
4021 pthread_sigmask(SIG_SETMASK, &oset, 0);
4022 }
4023 // Tell jvm's signal handler the signal is taken care of.
4024 return true;
4025 }
4027 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4028 bool chained = false;
4029 // signal-chaining
4030 if (UseSignalChaining) {
4031 struct sigaction *actp = get_chained_signal_action(sig);
4032 if (actp != NULL) {
4033 chained = call_chained_handler(actp, sig, siginfo, context);
4034 }
4035 }
4036 return chained;
4037 }
4039 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
4040 if ((( (unsigned int)1 << sig ) & sigs) != 0) {
4041 return &sigact[sig];
4042 }
4043 return NULL;
4044 }
4046 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4047 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
4048 sigact[sig] = oldAct;
4049 sigs |= (unsigned int)1 << sig;
4050 }
4052 // for diagnostic
4053 int os::Bsd::sigflags[MAXSIGNUM];
4055 int os::Bsd::get_our_sigflags(int sig) {
4056 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
4057 return sigflags[sig];
4058 }
4060 void os::Bsd::set_our_sigflags(int sig, int flags) {
4061 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
4062 sigflags[sig] = flags;
4063 }
4065 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
4066 // Check for overwrite.
4067 struct sigaction oldAct;
4068 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4070 void* oldhand = oldAct.sa_sigaction
4071 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4072 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4073 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4074 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4075 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
4076 if (AllowUserSignalHandlers || !set_installed) {
4077 // Do not overwrite; user takes responsibility to forward to us.
4078 return;
4079 } else if (UseSignalChaining) {
4080 // save the old handler in jvm
4081 save_preinstalled_handler(sig, oldAct);
4082 // libjsig also interposes the sigaction() call below and saves the
4083 // old sigaction on it own.
4084 } else {
4085 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4086 "%#lx for signal %d.", (long)oldhand, sig));
4087 }
4088 }
4090 struct sigaction sigAct;
4091 sigfillset(&(sigAct.sa_mask));
4092 sigAct.sa_handler = SIG_DFL;
4093 if (!set_installed) {
4094 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
4095 } else {
4096 sigAct.sa_sigaction = signalHandler;
4097 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
4098 }
4099 // Save flags, which are set by ours
4100 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
4101 sigflags[sig] = sigAct.sa_flags;
4103 int ret = sigaction(sig, &sigAct, &oldAct);
4104 assert(ret == 0, "check");
4106 void* oldhand2 = oldAct.sa_sigaction
4107 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4108 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4109 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4110 }
4112 // install signal handlers for signals that HotSpot needs to
4113 // handle in order to support Java-level exception handling.
4115 void os::Bsd::install_signal_handlers() {
4116 if (!signal_handlers_are_installed) {
4117 signal_handlers_are_installed = true;
4119 // signal-chaining
4120 typedef void (*signal_setting_t)();
4121 signal_setting_t begin_signal_setting = NULL;
4122 signal_setting_t end_signal_setting = NULL;
4123 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4124 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4125 if (begin_signal_setting != NULL) {
4126 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4127 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4128 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4129 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4130 libjsig_is_loaded = true;
4131 assert(UseSignalChaining, "should enable signal-chaining");
4132 }
4133 if (libjsig_is_loaded) {
4134 // Tell libjsig jvm is setting signal handlers
4135 (*begin_signal_setting)();
4136 }
4138 set_signal_handler(SIGSEGV, true);
4139 set_signal_handler(SIGPIPE, true);
4140 set_signal_handler(SIGBUS, true);
4141 set_signal_handler(SIGILL, true);
4142 set_signal_handler(SIGFPE, true);
4143 set_signal_handler(SIGXFSZ, true);
4145 #if defined(__APPLE__)
4146 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
4147 // signals caught and handled by the JVM. To work around this, we reset the mach task
4148 // signal handler that's placed on our process by CrashReporter. This disables
4149 // CrashReporter-based reporting.
4150 //
4151 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
4152 // on caught fatal signals.
4153 //
4154 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
4155 // handlers. By replacing the existing task exception handler, we disable gdb's mach
4156 // exception handling, while leaving the standard BSD signal handlers functional.
4157 kern_return_t kr;
4158 kr = task_set_exception_ports(mach_task_self(),
4159 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
4160 MACH_PORT_NULL,
4161 EXCEPTION_STATE_IDENTITY,
4162 MACHINE_THREAD_STATE);
4164 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
4165 #endif
4167 if (libjsig_is_loaded) {
4168 // Tell libjsig jvm finishes setting signal handlers
4169 (*end_signal_setting)();
4170 }
4172 // We don't activate signal checker if libjsig is in place, we trust ourselves
4173 // and if UserSignalHandler is installed all bets are off
4174 if (CheckJNICalls) {
4175 if (libjsig_is_loaded) {
4176 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4177 check_signals = false;
4178 }
4179 if (AllowUserSignalHandlers) {
4180 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4181 check_signals = false;
4182 }
4183 }
4184 }
4185 }
4187 #ifndef _ALLBSD_SOURCE
4188 // This is the fastest way to get thread cpu time on Bsd.
4189 // Returns cpu time (user+sys) for any thread, not only for current.
4190 // POSIX compliant clocks are implemented in the kernels 2.6.16+.
4191 // It might work on 2.6.10+ with a special kernel/glibc patch.
4192 // For reference, please, see IEEE Std 1003.1-2004:
4193 // http://www.unix.org/single_unix_specification
4195 jlong os::Bsd::fast_thread_cpu_time(clockid_t clockid) {
4196 struct timespec tp;
4197 int rc = os::Bsd::clock_gettime(clockid, &tp);
4198 assert(rc == 0, "clock_gettime is expected to return 0 code");
4200 return (tp.tv_sec * SEC_IN_NANOSECS) + tp.tv_nsec;
4201 }
4202 #endif
4204 /////
4205 // glibc on Bsd platform uses non-documented flag
4206 // to indicate, that some special sort of signal
4207 // trampoline is used.
4208 // We will never set this flag, and we should
4209 // ignore this flag in our diagnostic
4210 #ifdef SIGNIFICANT_SIGNAL_MASK
4211 #undef SIGNIFICANT_SIGNAL_MASK
4212 #endif
4213 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
4215 static const char* get_signal_handler_name(address handler,
4216 char* buf, int buflen) {
4217 int offset;
4218 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
4219 if (found) {
4220 // skip directory names
4221 const char *p1, *p2;
4222 p1 = buf;
4223 size_t len = strlen(os::file_separator());
4224 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
4225 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
4226 } else {
4227 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
4228 }
4229 return buf;
4230 }
4232 static void print_signal_handler(outputStream* st, int sig,
4233 char* buf, size_t buflen) {
4234 struct sigaction sa;
4236 sigaction(sig, NULL, &sa);
4238 // See comment for SIGNIFICANT_SIGNAL_MASK define
4239 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
4241 st->print("%s: ", os::exception_name(sig, buf, buflen));
4243 address handler = (sa.sa_flags & SA_SIGINFO)
4244 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
4245 : CAST_FROM_FN_PTR(address, sa.sa_handler);
4247 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
4248 st->print("SIG_DFL");
4249 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
4250 st->print("SIG_IGN");
4251 } else {
4252 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
4253 }
4255 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
4257 address rh = VMError::get_resetted_sighandler(sig);
4258 // May be, handler was resetted by VMError?
4259 if(rh != NULL) {
4260 handler = rh;
4261 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
4262 }
4264 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
4266 // Check: is it our handler?
4267 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
4268 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
4269 // It is our signal handler
4270 // check for flags, reset system-used one!
4271 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
4272 st->print(
4273 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
4274 os::Bsd::get_our_sigflags(sig));
4275 }
4276 }
4277 st->cr();
4278 }
4281 #define DO_SIGNAL_CHECK(sig) \
4282 if (!sigismember(&check_signal_done, sig)) \
4283 os::Bsd::check_signal_handler(sig)
4285 // This method is a periodic task to check for misbehaving JNI applications
4286 // under CheckJNI, we can add any periodic checks here
4288 void os::run_periodic_checks() {
4290 if (check_signals == false) return;
4292 // SEGV and BUS if overridden could potentially prevent
4293 // generation of hs*.log in the event of a crash, debugging
4294 // such a case can be very challenging, so we absolutely
4295 // check the following for a good measure:
4296 DO_SIGNAL_CHECK(SIGSEGV);
4297 DO_SIGNAL_CHECK(SIGILL);
4298 DO_SIGNAL_CHECK(SIGFPE);
4299 DO_SIGNAL_CHECK(SIGBUS);
4300 DO_SIGNAL_CHECK(SIGPIPE);
4301 DO_SIGNAL_CHECK(SIGXFSZ);
4304 // ReduceSignalUsage allows the user to override these handlers
4305 // see comments at the very top and jvm_solaris.h
4306 if (!ReduceSignalUsage) {
4307 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4308 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4309 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4310 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4311 }
4313 DO_SIGNAL_CHECK(SR_signum);
4314 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
4315 }
4317 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4319 static os_sigaction_t os_sigaction = NULL;
4321 void os::Bsd::check_signal_handler(int sig) {
4322 char buf[O_BUFLEN];
4323 address jvmHandler = NULL;
4326 struct sigaction act;
4327 if (os_sigaction == NULL) {
4328 // only trust the default sigaction, in case it has been interposed
4329 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4330 if (os_sigaction == NULL) return;
4331 }
4333 os_sigaction(sig, (struct sigaction*)NULL, &act);
4336 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
4338 address thisHandler = (act.sa_flags & SA_SIGINFO)
4339 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4340 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4343 switch(sig) {
4344 case SIGSEGV:
4345 case SIGBUS:
4346 case SIGFPE:
4347 case SIGPIPE:
4348 case SIGILL:
4349 case SIGXFSZ:
4350 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
4351 break;
4353 case SHUTDOWN1_SIGNAL:
4354 case SHUTDOWN2_SIGNAL:
4355 case SHUTDOWN3_SIGNAL:
4356 case BREAK_SIGNAL:
4357 jvmHandler = (address)user_handler();
4358 break;
4360 case INTERRUPT_SIGNAL:
4361 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
4362 break;
4364 default:
4365 if (sig == SR_signum) {
4366 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
4367 } else {
4368 return;
4369 }
4370 break;
4371 }
4373 if (thisHandler != jvmHandler) {
4374 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4375 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4376 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4377 // No need to check this sig any longer
4378 sigaddset(&check_signal_done, sig);
4379 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
4380 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4381 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig));
4382 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4383 // No need to check this sig any longer
4384 sigaddset(&check_signal_done, sig);
4385 }
4387 // Dump all the signal
4388 if (sigismember(&check_signal_done, sig)) {
4389 print_signal_handlers(tty, buf, O_BUFLEN);
4390 }
4391 }
4393 extern void report_error(char* file_name, int line_no, char* title, char* format, ...);
4395 extern bool signal_name(int signo, char* buf, size_t len);
4397 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4398 if (0 < exception_code && exception_code <= SIGRTMAX) {
4399 // signal
4400 if (!signal_name(exception_code, buf, size)) {
4401 jio_snprintf(buf, size, "SIG%d", exception_code);
4402 }
4403 return buf;
4404 } else {
4405 return NULL;
4406 }
4407 }
4409 // this is called _before_ the most of global arguments have been parsed
4410 void os::init(void) {
4411 char dummy; /* used to get a guess on initial stack address */
4412 // first_hrtime = gethrtime();
4414 // With BsdThreads the JavaMain thread pid (primordial thread)
4415 // is different than the pid of the java launcher thread.
4416 // So, on Bsd, the launcher thread pid is passed to the VM
4417 // via the sun.java.launcher.pid property.
4418 // Use this property instead of getpid() if it was correctly passed.
4419 // See bug 6351349.
4420 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
4422 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
4424 clock_tics_per_sec = CLK_TCK;
4426 init_random(1234567);
4428 ThreadCritical::initialize();
4430 Bsd::set_page_size(getpagesize());
4431 if (Bsd::page_size() == -1) {
4432 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)",
4433 strerror(errno)));
4434 }
4435 init_page_sizes((size_t) Bsd::page_size());
4437 Bsd::initialize_system_info();
4439 // main_thread points to the aboriginal thread
4440 Bsd::_main_thread = pthread_self();
4442 Bsd::clock_init();
4443 initial_time_count = os::elapsed_counter();
4445 #ifdef __APPLE__
4446 // XXXDARWIN
4447 // Work around the unaligned VM callbacks in hotspot's
4448 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on
4449 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces
4450 // alignment when doing symbol lookup. To work around this, we force early
4451 // binding of all symbols now, thus binding when alignment is known-good.
4452 _dyld_bind_fully_image_containing_address((const void *) &os::init);
4453 #endif
4454 }
4456 // To install functions for atexit system call
4457 extern "C" {
4458 static void perfMemory_exit_helper() {
4459 perfMemory_exit();
4460 }
4461 }
4463 // this is called _after_ the global arguments have been parsed
4464 jint os::init_2(void)
4465 {
4466 #ifndef _ALLBSD_SOURCE
4467 Bsd::fast_thread_clock_init();
4468 #endif
4470 // Allocate a single page and mark it as readable for safepoint polling
4471 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
4472 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" );
4474 os::set_polling_page( polling_page );
4476 #ifndef PRODUCT
4477 if(Verbose && PrintMiscellaneous)
4478 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4479 #endif
4481 if (!UseMembar) {
4482 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
4483 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4484 os::set_memory_serialize_page( mem_serialize_page );
4486 #ifndef PRODUCT
4487 if(Verbose && PrintMiscellaneous)
4488 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4489 #endif
4490 }
4492 os::large_page_init();
4494 // initialize suspend/resume support - must do this before signal_sets_init()
4495 if (SR_initialize() != 0) {
4496 perror("SR_initialize failed");
4497 return JNI_ERR;
4498 }
4500 Bsd::signal_sets_init();
4501 Bsd::install_signal_handlers();
4503 // Check minimum allowable stack size for thread creation and to initialize
4504 // the java system classes, including StackOverflowError - depends on page
4505 // size. Add a page for compiler2 recursion in main thread.
4506 // Add in 2*BytesPerWord times page size to account for VM stack during
4507 // class initialization depending on 32 or 64 bit VM.
4508 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed,
4509 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4510 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size());
4512 size_t threadStackSizeInBytes = ThreadStackSize * K;
4513 if (threadStackSizeInBytes != 0 &&
4514 threadStackSizeInBytes < os::Bsd::min_stack_allowed) {
4515 tty->print_cr("\nThe stack size specified is too small, "
4516 "Specify at least %dk",
4517 os::Bsd::min_stack_allowed/ K);
4518 return JNI_ERR;
4519 }
4521 // Make the stack size a multiple of the page size so that
4522 // the yellow/red zones can be guarded.
4523 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4524 vm_page_size()));
4526 #ifndef _ALLBSD_SOURCE
4527 Bsd::capture_initial_stack(JavaThread::stack_size_at_create());
4529 Bsd::libpthread_init();
4530 if (PrintMiscellaneous && (Verbose || WizardMode)) {
4531 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n",
4532 Bsd::glibc_version(), Bsd::libpthread_version(),
4533 Bsd::is_floating_stack() ? "floating stack" : "fixed stack");
4534 }
4536 if (UseNUMA) {
4537 if (!Bsd::libnuma_init()) {
4538 UseNUMA = false;
4539 } else {
4540 if ((Bsd::numa_max_node() < 1)) {
4541 // There's only one node(they start from 0), disable NUMA.
4542 UseNUMA = false;
4543 }
4544 }
4545 // With SHM large pages we cannot uncommit a page, so there's not way
4546 // we can make the adaptive lgrp chunk resizing work. If the user specified
4547 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and
4548 // disable adaptive resizing.
4549 if (UseNUMA && UseLargePages && UseSHM) {
4550 if (!FLAG_IS_DEFAULT(UseNUMA)) {
4551 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) {
4552 UseLargePages = false;
4553 } else {
4554 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing");
4555 UseAdaptiveSizePolicy = false;
4556 UseAdaptiveNUMAChunkSizing = false;
4557 }
4558 } else {
4559 UseNUMA = false;
4560 }
4561 }
4562 if (!UseNUMA && ForceNUMA) {
4563 UseNUMA = true;
4564 }
4565 }
4566 #endif
4568 if (MaxFDLimit) {
4569 // set the number of file descriptors to max. print out error
4570 // if getrlimit/setrlimit fails but continue regardless.
4571 struct rlimit nbr_files;
4572 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4573 if (status != 0) {
4574 if (PrintMiscellaneous && (Verbose || WizardMode))
4575 perror("os::init_2 getrlimit failed");
4576 } else {
4577 nbr_files.rlim_cur = nbr_files.rlim_max;
4579 #ifdef __APPLE__
4580 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
4581 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
4582 // be used instead
4583 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
4584 #endif
4586 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4587 if (status != 0) {
4588 if (PrintMiscellaneous && (Verbose || WizardMode))
4589 perror("os::init_2 setrlimit failed");
4590 }
4591 }
4592 }
4594 #ifndef _ALLBSD_SOURCE
4595 // Initialize lock used to serialize thread creation (see os::create_thread)
4596 Bsd::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false));
4597 #endif
4599 // at-exit methods are called in the reverse order of their registration.
4600 // atexit functions are called on return from main or as a result of a
4601 // call to exit(3C). There can be only 32 of these functions registered
4602 // and atexit() does not set errno.
4604 if (PerfAllowAtExitRegistration) {
4605 // only register atexit functions if PerfAllowAtExitRegistration is set.
4606 // atexit functions can be delayed until process exit time, which
4607 // can be problematic for embedded VM situations. Embedded VMs should
4608 // call DestroyJavaVM() to assure that VM resources are released.
4610 // note: perfMemory_exit_helper atexit function may be removed in
4611 // the future if the appropriate cleanup code can be added to the
4612 // VM_Exit VMOperation's doit method.
4613 if (atexit(perfMemory_exit_helper) != 0) {
4614 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4615 }
4616 }
4618 // initialize thread priority policy
4619 prio_init();
4621 #ifdef __APPLE__
4622 // dynamically link to objective c gc registration
4623 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
4624 if (handleLibObjc != NULL) {
4625 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
4626 }
4627 #endif
4629 return JNI_OK;
4630 }
4632 // this is called at the end of vm_initialization
4633 void os::init_3(void) { }
4635 // Mark the polling page as unreadable
4636 void os::make_polling_page_unreadable(void) {
4637 if( !guard_memory((char*)_polling_page, Bsd::page_size()) )
4638 fatal("Could not disable polling page");
4639 };
4641 // Mark the polling page as readable
4642 void os::make_polling_page_readable(void) {
4643 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
4644 fatal("Could not enable polling page");
4645 }
4646 };
4648 int os::active_processor_count() {
4649 #ifdef _ALLBSD_SOURCE
4650 return _processor_count;
4651 #else
4652 // Bsd doesn't yet have a (official) notion of processor sets,
4653 // so just return the number of online processors.
4654 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
4655 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
4656 return online_cpus;
4657 #endif
4658 }
4660 void os::set_native_thread_name(const char *name) {
4661 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
4662 // This is only supported in Snow Leopard and beyond
4663 if (name != NULL) {
4664 // Add a "Java: " prefix to the name
4665 char buf[MAXTHREADNAMESIZE];
4666 snprintf(buf, sizeof(buf), "Java: %s", name);
4667 pthread_setname_np(buf);
4668 }
4669 #endif
4670 }
4672 bool os::distribute_processes(uint length, uint* distribution) {
4673 // Not yet implemented.
4674 return false;
4675 }
4677 bool os::bind_to_processor(uint processor_id) {
4678 // Not yet implemented.
4679 return false;
4680 }
4682 ///
4684 // Suspends the target using the signal mechanism and then grabs the PC before
4685 // resuming the target. Used by the flat-profiler only
4686 ExtendedPC os::get_thread_pc(Thread* thread) {
4687 // Make sure that it is called by the watcher for the VMThread
4688 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
4689 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4691 ExtendedPC epc;
4693 OSThread* osthread = thread->osthread();
4694 if (do_suspend(osthread)) {
4695 if (osthread->ucontext() != NULL) {
4696 epc = os::Bsd::ucontext_get_pc(osthread->ucontext());
4697 } else {
4698 // NULL context is unexpected, double-check this is the VMThread
4699 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4700 }
4701 do_resume(osthread);
4702 }
4703 // failure means pthread_kill failed for some reason - arguably this is
4704 // a fatal problem, but such problems are ignored elsewhere
4706 return epc;
4707 }
4709 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime)
4710 {
4711 #ifdef _ALLBSD_SOURCE
4712 return pthread_cond_timedwait(_cond, _mutex, _abstime);
4713 #else
4714 if (is_NPTL()) {
4715 return pthread_cond_timedwait(_cond, _mutex, _abstime);
4716 } else {
4717 #ifndef IA64
4718 // 6292965: BsdThreads pthread_cond_timedwait() resets FPU control
4719 // word back to default 64bit precision if condvar is signaled. Java
4720 // wants 53bit precision. Save and restore current value.
4721 int fpu = get_fpu_control_word();
4722 #endif // IA64
4723 int status = pthread_cond_timedwait(_cond, _mutex, _abstime);
4724 #ifndef IA64
4725 set_fpu_control_word(fpu);
4726 #endif // IA64
4727 return status;
4728 }
4729 #endif
4730 }
4732 ////////////////////////////////////////////////////////////////////////////////
4733 // debug support
4735 static address same_page(address x, address y) {
4736 int page_bits = -os::vm_page_size();
4737 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
4738 return x;
4739 else if (x > y)
4740 return (address)(intptr_t(y) | ~page_bits) + 1;
4741 else
4742 return (address)(intptr_t(y) & page_bits);
4743 }
4745 bool os::find(address addr, outputStream* st) {
4746 Dl_info dlinfo;
4747 memset(&dlinfo, 0, sizeof(dlinfo));
4748 if (dladdr(addr, &dlinfo)) {
4749 st->print(PTR_FORMAT ": ", addr);
4750 if (dlinfo.dli_sname != NULL) {
4751 st->print("%s+%#x", dlinfo.dli_sname,
4752 addr - (intptr_t)dlinfo.dli_saddr);
4753 } else if (dlinfo.dli_fname) {
4754 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase);
4755 } else {
4756 st->print("<absolute address>");
4757 }
4758 if (dlinfo.dli_fname) {
4759 st->print(" in %s", dlinfo.dli_fname);
4760 }
4761 if (dlinfo.dli_fbase) {
4762 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4763 }
4764 st->cr();
4766 if (Verbose) {
4767 // decode some bytes around the PC
4768 address begin = same_page(addr-40, addr);
4769 address end = same_page(addr+40, addr);
4770 address lowest = (address) dlinfo.dli_sname;
4771 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4772 if (begin < lowest) begin = lowest;
4773 Dl_info dlinfo2;
4774 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
4775 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
4776 end = (address) dlinfo2.dli_saddr;
4777 Disassembler::decode(begin, end, st);
4778 }
4779 return true;
4780 }
4781 return false;
4782 }
4784 ////////////////////////////////////////////////////////////////////////////////
4785 // misc
4787 // This does not do anything on Bsd. This is basically a hook for being
4788 // able to use structured exception handling (thread-local exception filters)
4789 // on, e.g., Win32.
4790 void
4791 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
4792 JavaCallArguments* args, Thread* thread) {
4793 f(value, method, args, thread);
4794 }
4796 void os::print_statistics() {
4797 }
4799 int os::message_box(const char* title, const char* message) {
4800 int i;
4801 fdStream err(defaultStream::error_fd());
4802 for (i = 0; i < 78; i++) err.print_raw("=");
4803 err.cr();
4804 err.print_raw_cr(title);
4805 for (i = 0; i < 78; i++) err.print_raw("-");
4806 err.cr();
4807 err.print_raw_cr(message);
4808 for (i = 0; i < 78; i++) err.print_raw("=");
4809 err.cr();
4811 char buf[16];
4812 // Prevent process from exiting upon "read error" without consuming all CPU
4813 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4815 return buf[0] == 'y' || buf[0] == 'Y';
4816 }
4818 int os::stat(const char *path, struct stat *sbuf) {
4819 char pathbuf[MAX_PATH];
4820 if (strlen(path) > MAX_PATH - 1) {
4821 errno = ENAMETOOLONG;
4822 return -1;
4823 }
4824 os::native_path(strcpy(pathbuf, path));
4825 return ::stat(pathbuf, sbuf);
4826 }
4828 bool os::check_heap(bool force) {
4829 return true;
4830 }
4832 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
4833 return ::vsnprintf(buf, count, format, args);
4834 }
4836 // Is a (classpath) directory empty?
4837 bool os::dir_is_empty(const char* path) {
4838 DIR *dir = NULL;
4839 struct dirent *ptr;
4841 dir = opendir(path);
4842 if (dir == NULL) return true;
4844 /* Scan the directory */
4845 bool result = true;
4846 char buf[sizeof(struct dirent) + MAX_PATH];
4847 while (result && (ptr = ::readdir(dir)) != NULL) {
4848 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4849 result = false;
4850 }
4851 }
4852 closedir(dir);
4853 return result;
4854 }
4856 // This code originates from JDK's sysOpen and open64_w
4857 // from src/solaris/hpi/src/system_md.c
4859 #ifndef O_DELETE
4860 #define O_DELETE 0x10000
4861 #endif
4863 // Open a file. Unlink the file immediately after open returns
4864 // if the specified oflag has the O_DELETE flag set.
4865 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
4867 int os::open(const char *path, int oflag, int mode) {
4869 if (strlen(path) > MAX_PATH - 1) {
4870 errno = ENAMETOOLONG;
4871 return -1;
4872 }
4873 int fd;
4874 int o_delete = (oflag & O_DELETE);
4875 oflag = oflag & ~O_DELETE;
4877 fd = ::open(path, oflag, mode);
4878 if (fd == -1) return -1;
4880 //If the open succeeded, the file might still be a directory
4881 {
4882 struct stat buf;
4883 int ret = ::fstat(fd, &buf);
4884 int st_mode = buf.st_mode;
4886 if (ret != -1) {
4887 if ((st_mode & S_IFMT) == S_IFDIR) {
4888 errno = EISDIR;
4889 ::close(fd);
4890 return -1;
4891 }
4892 } else {
4893 ::close(fd);
4894 return -1;
4895 }
4896 }
4898 /*
4899 * All file descriptors that are opened in the JVM and not
4900 * specifically destined for a subprocess should have the
4901 * close-on-exec flag set. If we don't set it, then careless 3rd
4902 * party native code might fork and exec without closing all
4903 * appropriate file descriptors (e.g. as we do in closeDescriptors in
4904 * UNIXProcess.c), and this in turn might:
4905 *
4906 * - cause end-of-file to fail to be detected on some file
4907 * descriptors, resulting in mysterious hangs, or
4908 *
4909 * - might cause an fopen in the subprocess to fail on a system
4910 * suffering from bug 1085341.
4911 *
4912 * (Yes, the default setting of the close-on-exec flag is a Unix
4913 * design flaw)
4914 *
4915 * See:
4916 * 1085341: 32-bit stdio routines should support file descriptors >255
4917 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4918 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4919 */
4920 #ifdef FD_CLOEXEC
4921 {
4922 int flags = ::fcntl(fd, F_GETFD);
4923 if (flags != -1)
4924 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4925 }
4926 #endif
4928 if (o_delete != 0) {
4929 ::unlink(path);
4930 }
4931 return fd;
4932 }
4935 // create binary file, rewriting existing file if required
4936 int os::create_binary_file(const char* path, bool rewrite_existing) {
4937 int oflags = O_WRONLY | O_CREAT;
4938 if (!rewrite_existing) {
4939 oflags |= O_EXCL;
4940 }
4941 return ::open(path, oflags, S_IREAD | S_IWRITE);
4942 }
4944 // return current position of file pointer
4945 jlong os::current_file_offset(int fd) {
4946 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
4947 }
4949 // move file pointer to the specified offset
4950 jlong os::seek_to_file_offset(int fd, jlong offset) {
4951 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
4952 }
4954 // This code originates from JDK's sysAvailable
4955 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4957 int os::available(int fd, jlong *bytes) {
4958 jlong cur, end;
4959 int mode;
4960 struct stat buf;
4962 if (::fstat(fd, &buf) >= 0) {
4963 mode = buf.st_mode;
4964 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4965 /*
4966 * XXX: is the following call interruptible? If so, this might
4967 * need to go through the INTERRUPT_IO() wrapper as for other
4968 * blocking, interruptible calls in this file.
4969 */
4970 int n;
4971 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4972 *bytes = n;
4973 return 1;
4974 }
4975 }
4976 }
4977 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
4978 return 0;
4979 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
4980 return 0;
4981 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
4982 return 0;
4983 }
4984 *bytes = end - cur;
4985 return 1;
4986 }
4988 int os::socket_available(int fd, jint *pbytes) {
4989 if (fd < 0)
4990 return OS_OK;
4992 int ret;
4994 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
4996 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
4997 // is expected to return 0 on failure and 1 on success to the jdk.
4999 return (ret == OS_ERR) ? 0 : 1;
5000 }
5002 // Map a block of memory.
5003 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
5004 char *addr, size_t bytes, bool read_only,
5005 bool allow_exec) {
5006 int prot;
5007 int flags;
5009 if (read_only) {
5010 prot = PROT_READ;
5011 flags = MAP_SHARED;
5012 } else {
5013 prot = PROT_READ | PROT_WRITE;
5014 flags = MAP_PRIVATE;
5015 }
5017 if (allow_exec) {
5018 prot |= PROT_EXEC;
5019 }
5021 if (addr != NULL) {
5022 flags |= MAP_FIXED;
5023 }
5025 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5026 fd, file_offset);
5027 if (mapped_address == MAP_FAILED) {
5028 return NULL;
5029 }
5030 return mapped_address;
5031 }
5034 // Remap a block of memory.
5035 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
5036 char *addr, size_t bytes, bool read_only,
5037 bool allow_exec) {
5038 // same as map_memory() on this OS
5039 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5040 allow_exec);
5041 }
5044 // Unmap a block of memory.
5045 bool os::unmap_memory(char* addr, size_t bytes) {
5046 return munmap(addr, bytes) == 0;
5047 }
5049 #ifndef _ALLBSD_SOURCE
5050 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time);
5052 static clockid_t thread_cpu_clockid(Thread* thread) {
5053 pthread_t tid = thread->osthread()->pthread_id();
5054 clockid_t clockid;
5056 // Get thread clockid
5057 int rc = os::Bsd::pthread_getcpuclockid(tid, &clockid);
5058 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code");
5059 return clockid;
5060 }
5061 #endif
5063 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5064 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5065 // of a thread.
5066 //
5067 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
5068 // the fast estimate available on the platform.
5070 jlong os::current_thread_cpu_time() {
5071 #ifdef __APPLE__
5072 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
5073 #elif !defined(_ALLBSD_SOURCE)
5074 if (os::Bsd::supports_fast_thread_cpu_time()) {
5075 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID);
5076 } else {
5077 // return user + sys since the cost is the same
5078 return slow_thread_cpu_time(Thread::current(), true /* user + sys */);
5079 }
5080 #endif
5081 }
5083 jlong os::thread_cpu_time(Thread* thread) {
5084 #ifndef _ALLBSD_SOURCE
5085 // consistent with what current_thread_cpu_time() returns
5086 if (os::Bsd::supports_fast_thread_cpu_time()) {
5087 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread));
5088 } else {
5089 return slow_thread_cpu_time(thread, true /* user + sys */);
5090 }
5091 #endif
5092 }
5094 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5095 #ifdef __APPLE__
5096 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5097 #elif !defined(_ALLBSD_SOURCE)
5098 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) {
5099 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID);
5100 } else {
5101 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time);
5102 }
5103 #endif
5104 }
5106 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5107 #ifdef __APPLE__
5108 struct thread_basic_info tinfo;
5109 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
5110 kern_return_t kr;
5111 mach_port_t mach_thread;
5113 mach_thread = pthread_mach_thread_np(thread->osthread()->thread_id());
5114 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
5115 if (kr != KERN_SUCCESS)
5116 return -1;
5118 if (user_sys_cpu_time) {
5119 jlong nanos;
5120 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
5121 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
5122 return nanos;
5123 } else {
5124 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
5125 }
5126 #elif !defined(_ALLBSD_SOURCE)
5127 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) {
5128 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread));
5129 } else {
5130 return slow_thread_cpu_time(thread, user_sys_cpu_time);
5131 }
5132 #endif
5133 }
5135 #ifndef _ALLBSD_SOURCE
5136 //
5137 // -1 on error.
5138 //
5140 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5141 static bool proc_pid_cpu_avail = true;
5142 static bool proc_task_unchecked = true;
5143 static const char *proc_stat_path = "/proc/%d/stat";
5144 pid_t tid = thread->osthread()->thread_id();
5145 int i;
5146 char *s;
5147 char stat[2048];
5148 int statlen;
5149 char proc_name[64];
5150 int count;
5151 long sys_time, user_time;
5152 char string[64];
5153 char cdummy;
5154 int idummy;
5155 long ldummy;
5156 FILE *fp;
5158 // We first try accessing /proc/<pid>/cpu since this is faster to
5159 // process. If this file is not present (bsd kernels 2.5 and above)
5160 // then we open /proc/<pid>/stat.
5161 if ( proc_pid_cpu_avail ) {
5162 sprintf(proc_name, "/proc/%d/cpu", tid);
5163 fp = fopen(proc_name, "r");
5164 if ( fp != NULL ) {
5165 count = fscanf( fp, "%s %lu %lu\n", string, &user_time, &sys_time);
5166 fclose(fp);
5167 if ( count != 3 ) return -1;
5169 if (user_sys_cpu_time) {
5170 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec);
5171 } else {
5172 return (jlong)user_time * (1000000000 / clock_tics_per_sec);
5173 }
5174 }
5175 else proc_pid_cpu_avail = false;
5176 }
5178 // The /proc/<tid>/stat aggregates per-process usage on
5179 // new Bsd kernels 2.6+ where NPTL is supported.
5180 // The /proc/self/task/<tid>/stat still has the per-thread usage.
5181 // See bug 6328462.
5182 // There can be no directory /proc/self/task on kernels 2.4 with NPTL
5183 // and possibly in some other cases, so we check its availability.
5184 if (proc_task_unchecked && os::Bsd::is_NPTL()) {
5185 // This is executed only once
5186 proc_task_unchecked = false;
5187 fp = fopen("/proc/self/task", "r");
5188 if (fp != NULL) {
5189 proc_stat_path = "/proc/self/task/%d/stat";
5190 fclose(fp);
5191 }
5192 }
5194 sprintf(proc_name, proc_stat_path, tid);
5195 fp = fopen(proc_name, "r");
5196 if ( fp == NULL ) return -1;
5197 statlen = fread(stat, 1, 2047, fp);
5198 stat[statlen] = '\0';
5199 fclose(fp);
5201 // Skip pid and the command string. Note that we could be dealing with
5202 // weird command names, e.g. user could decide to rename java launcher
5203 // to "java 1.4.2 :)", then the stat file would look like
5204 // 1234 (java 1.4.2 :)) R ... ...
5205 // We don't really need to know the command string, just find the last
5206 // occurrence of ")" and then start parsing from there. See bug 4726580.
5207 s = strrchr(stat, ')');
5208 i = 0;
5209 if (s == NULL ) return -1;
5211 // Skip blank chars
5212 do s++; while (isspace(*s));
5214 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu",
5215 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy,
5216 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy,
5217 &user_time, &sys_time);
5218 if ( count != 13 ) return -1;
5219 if (user_sys_cpu_time) {
5220 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec);
5221 } else {
5222 return (jlong)user_time * (1000000000 / clock_tics_per_sec);
5223 }
5224 }
5225 #endif
5227 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5228 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5229 info_ptr->may_skip_backward = false; // elapsed time not wall time
5230 info_ptr->may_skip_forward = false; // elapsed time not wall time
5231 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
5232 }
5234 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5235 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5236 info_ptr->may_skip_backward = false; // elapsed time not wall time
5237 info_ptr->may_skip_forward = false; // elapsed time not wall time
5238 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
5239 }
5241 bool os::is_thread_cpu_time_supported() {
5242 #ifdef __APPLE__
5243 return true;
5244 #elif defined(_ALLBSD_SOURCE)
5245 return false;
5246 #else
5247 return true;
5248 #endif
5249 }
5251 // System loadavg support. Returns -1 if load average cannot be obtained.
5252 // Bsd doesn't yet have a (official) notion of processor sets,
5253 // so just return the system wide load average.
5254 int os::loadavg(double loadavg[], int nelem) {
5255 return ::getloadavg(loadavg, nelem);
5256 }
5258 void os::pause() {
5259 char filename[MAX_PATH];
5260 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5261 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5262 } else {
5263 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5264 }
5266 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5267 if (fd != -1) {
5268 struct stat buf;
5269 ::close(fd);
5270 while (::stat(filename, &buf) == 0) {
5271 (void)::poll(NULL, 0, 100);
5272 }
5273 } else {
5274 jio_fprintf(stderr,
5275 "Could not open pause file '%s', continuing immediately.\n", filename);
5276 }
5277 }
5280 // Refer to the comments in os_solaris.cpp park-unpark.
5281 //
5282 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
5283 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
5284 // For specifics regarding the bug see GLIBC BUGID 261237 :
5285 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
5286 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
5287 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
5288 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
5289 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
5290 // and monitorenter when we're using 1-0 locking. All those operations may result in
5291 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
5292 // of libpthread avoids the problem, but isn't practical.
5293 //
5294 // Possible remedies:
5295 //
5296 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
5297 // This is palliative and probabilistic, however. If the thread is preempted
5298 // between the call to compute_abstime() and pthread_cond_timedwait(), more
5299 // than the minimum period may have passed, and the abstime may be stale (in the
5300 // past) resultin in a hang. Using this technique reduces the odds of a hang
5301 // but the JVM is still vulnerable, particularly on heavily loaded systems.
5302 //
5303 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
5304 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
5305 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
5306 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
5307 // thread.
5308 //
5309 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
5310 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
5311 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
5312 // This also works well. In fact it avoids kernel-level scalability impediments
5313 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
5314 // timers in a graceful fashion.
5315 //
5316 // 4. When the abstime value is in the past it appears that control returns
5317 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
5318 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
5319 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
5320 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
5321 // It may be possible to avoid reinitialization by checking the return
5322 // value from pthread_cond_timedwait(). In addition to reinitializing the
5323 // condvar we must establish the invariant that cond_signal() is only called
5324 // within critical sections protected by the adjunct mutex. This prevents
5325 // cond_signal() from "seeing" a condvar that's in the midst of being
5326 // reinitialized or that is corrupt. Sadly, this invariant obviates the
5327 // desirable signal-after-unlock optimization that avoids futile context switching.
5328 //
5329 // I'm also concerned that some versions of NTPL might allocate an auxilliary
5330 // structure when a condvar is used or initialized. cond_destroy() would
5331 // release the helper structure. Our reinitialize-after-timedwait fix
5332 // put excessive stress on malloc/free and locks protecting the c-heap.
5333 //
5334 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
5335 // It may be possible to refine (4) by checking the kernel and NTPL verisons
5336 // and only enabling the work-around for vulnerable environments.
5338 // utility to compute the abstime argument to timedwait:
5339 // millis is the relative timeout time
5340 // abstime will be the absolute timeout time
5341 // TODO: replace compute_abstime() with unpackTime()
5343 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) {
5344 if (millis < 0) millis = 0;
5345 struct timeval now;
5346 int status = gettimeofday(&now, NULL);
5347 assert(status == 0, "gettimeofday");
5348 jlong seconds = millis / 1000;
5349 millis %= 1000;
5350 if (seconds > 50000000) { // see man cond_timedwait(3T)
5351 seconds = 50000000;
5352 }
5353 abstime->tv_sec = now.tv_sec + seconds;
5354 long usec = now.tv_usec + millis * 1000;
5355 if (usec >= 1000000) {
5356 abstime->tv_sec += 1;
5357 usec -= 1000000;
5358 }
5359 abstime->tv_nsec = usec * 1000;
5360 return abstime;
5361 }
5364 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5365 // Conceptually TryPark() should be equivalent to park(0).
5367 int os::PlatformEvent::TryPark() {
5368 for (;;) {
5369 const int v = _Event ;
5370 guarantee ((v == 0) || (v == 1), "invariant") ;
5371 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5372 }
5373 }
5375 void os::PlatformEvent::park() { // AKA "down()"
5376 // Invariant: Only the thread associated with the Event/PlatformEvent
5377 // may call park().
5378 // TODO: assert that _Assoc != NULL or _Assoc == Self
5379 int v ;
5380 for (;;) {
5381 v = _Event ;
5382 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5383 }
5384 guarantee (v >= 0, "invariant") ;
5385 if (v == 0) {
5386 // Do this the hard way by blocking ...
5387 int status = pthread_mutex_lock(_mutex);
5388 assert_status(status == 0, status, "mutex_lock");
5389 guarantee (_nParked == 0, "invariant") ;
5390 ++ _nParked ;
5391 while (_Event < 0) {
5392 status = pthread_cond_wait(_cond, _mutex);
5393 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5394 // Treat this the same as if the wait was interrupted
5395 if (status == ETIMEDOUT) { status = EINTR; }
5396 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5397 }
5398 -- _nParked ;
5400 // In theory we could move the ST of 0 into _Event past the unlock(),
5401 // but then we'd need a MEMBAR after the ST.
5402 _Event = 0 ;
5403 status = pthread_mutex_unlock(_mutex);
5404 assert_status(status == 0, status, "mutex_unlock");
5405 }
5406 guarantee (_Event >= 0, "invariant") ;
5407 }
5409 int os::PlatformEvent::park(jlong millis) {
5410 guarantee (_nParked == 0, "invariant") ;
5412 int v ;
5413 for (;;) {
5414 v = _Event ;
5415 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5416 }
5417 guarantee (v >= 0, "invariant") ;
5418 if (v != 0) return OS_OK ;
5420 // We do this the hard way, by blocking the thread.
5421 // Consider enforcing a minimum timeout value.
5422 struct timespec abst;
5423 compute_abstime(&abst, millis);
5425 int ret = OS_TIMEOUT;
5426 int status = pthread_mutex_lock(_mutex);
5427 assert_status(status == 0, status, "mutex_lock");
5428 guarantee (_nParked == 0, "invariant") ;
5429 ++_nParked ;
5431 // Object.wait(timo) will return because of
5432 // (a) notification
5433 // (b) timeout
5434 // (c) thread.interrupt
5435 //
5436 // Thread.interrupt and object.notify{All} both call Event::set.
5437 // That is, we treat thread.interrupt as a special case of notification.
5438 // The underlying Solaris implementation, cond_timedwait, admits
5439 // spurious/premature wakeups, but the JLS/JVM spec prevents the
5440 // JVM from making those visible to Java code. As such, we must
5441 // filter out spurious wakeups. We assume all ETIME returns are valid.
5442 //
5443 // TODO: properly differentiate simultaneous notify+interrupt.
5444 // In that case, we should propagate the notify to another waiter.
5446 while (_Event < 0) {
5447 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst);
5448 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
5449 pthread_cond_destroy (_cond);
5450 pthread_cond_init (_cond, NULL) ;
5451 }
5452 assert_status(status == 0 || status == EINTR ||
5453 status == ETIMEDOUT,
5454 status, "cond_timedwait");
5455 if (!FilterSpuriousWakeups) break ; // previous semantics
5456 if (status == ETIMEDOUT) break ;
5457 // We consume and ignore EINTR and spurious wakeups.
5458 }
5459 --_nParked ;
5460 if (_Event >= 0) {
5461 ret = OS_OK;
5462 }
5463 _Event = 0 ;
5464 status = pthread_mutex_unlock(_mutex);
5465 assert_status(status == 0, status, "mutex_unlock");
5466 assert (_nParked == 0, "invariant") ;
5467 return ret;
5468 }
5470 void os::PlatformEvent::unpark() {
5471 int v, AnyWaiters ;
5472 for (;;) {
5473 v = _Event ;
5474 if (v > 0) {
5475 // The LD of _Event could have reordered or be satisfied
5476 // by a read-aside from this processor's write buffer.
5477 // To avoid problems execute a barrier and then
5478 // ratify the value.
5479 OrderAccess::fence() ;
5480 if (_Event == v) return ;
5481 continue ;
5482 }
5483 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
5484 }
5485 if (v < 0) {
5486 // Wait for the thread associated with the event to vacate
5487 int status = pthread_mutex_lock(_mutex);
5488 assert_status(status == 0, status, "mutex_lock");
5489 AnyWaiters = _nParked ;
5490 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
5491 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) {
5492 AnyWaiters = 0 ;
5493 pthread_cond_signal (_cond);
5494 }
5495 status = pthread_mutex_unlock(_mutex);
5496 assert_status(status == 0, status, "mutex_unlock");
5497 if (AnyWaiters != 0) {
5498 status = pthread_cond_signal(_cond);
5499 assert_status(status == 0, status, "cond_signal");
5500 }
5501 }
5503 // Note that we signal() _after dropping the lock for "immortal" Events.
5504 // This is safe and avoids a common class of futile wakeups. In rare
5505 // circumstances this can cause a thread to return prematurely from
5506 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
5507 // simply re-test the condition and re-park itself.
5508 }
5511 // JSR166
5512 // -------------------------------------------------------
5514 /*
5515 * The solaris and bsd implementations of park/unpark are fairly
5516 * conservative for now, but can be improved. They currently use a
5517 * mutex/condvar pair, plus a a count.
5518 * Park decrements count if > 0, else does a condvar wait. Unpark
5519 * sets count to 1 and signals condvar. Only one thread ever waits
5520 * on the condvar. Contention seen when trying to park implies that someone
5521 * is unparking you, so don't wait. And spurious returns are fine, so there
5522 * is no need to track notifications.
5523 */
5526 #define NANOSECS_PER_SEC 1000000000
5527 #define NANOSECS_PER_MILLISEC 1000000
5528 #define MAX_SECS 100000000
5529 /*
5530 * This code is common to bsd and solaris and will be moved to a
5531 * common place in dolphin.
5532 *
5533 * The passed in time value is either a relative time in nanoseconds
5534 * or an absolute time in milliseconds. Either way it has to be unpacked
5535 * into suitable seconds and nanoseconds components and stored in the
5536 * given timespec structure.
5537 * Given time is a 64-bit value and the time_t used in the timespec is only
5538 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for
5539 * overflow if times way in the future are given. Further on Solaris versions
5540 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5541 * number of seconds, in abstime, is less than current_time + 100,000,000.
5542 * As it will be 28 years before "now + 100000000" will overflow we can
5543 * ignore overflow and just impose a hard-limit on seconds using the value
5544 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5545 * years from "now".
5546 */
5548 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) {
5549 assert (time > 0, "convertTime");
5551 struct timeval now;
5552 int status = gettimeofday(&now, NULL);
5553 assert(status == 0, "gettimeofday");
5555 time_t max_secs = now.tv_sec + MAX_SECS;
5557 if (isAbsolute) {
5558 jlong secs = time / 1000;
5559 if (secs > max_secs) {
5560 absTime->tv_sec = max_secs;
5561 }
5562 else {
5563 absTime->tv_sec = secs;
5564 }
5565 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5566 }
5567 else {
5568 jlong secs = time / NANOSECS_PER_SEC;
5569 if (secs >= MAX_SECS) {
5570 absTime->tv_sec = max_secs;
5571 absTime->tv_nsec = 0;
5572 }
5573 else {
5574 absTime->tv_sec = now.tv_sec + secs;
5575 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5576 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5577 absTime->tv_nsec -= NANOSECS_PER_SEC;
5578 ++absTime->tv_sec; // note: this must be <= max_secs
5579 }
5580 }
5581 }
5582 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5583 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5584 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5585 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5586 }
5588 void Parker::park(bool isAbsolute, jlong time) {
5589 // Optional fast-path check:
5590 // Return immediately if a permit is available.
5591 if (_counter > 0) {
5592 _counter = 0 ;
5593 OrderAccess::fence();
5594 return ;
5595 }
5597 Thread* thread = Thread::current();
5598 assert(thread->is_Java_thread(), "Must be JavaThread");
5599 JavaThread *jt = (JavaThread *)thread;
5601 // Optional optimization -- avoid state transitions if there's an interrupt pending.
5602 // Check interrupt before trying to wait
5603 if (Thread::is_interrupted(thread, false)) {
5604 return;
5605 }
5607 // Next, demultiplex/decode time arguments
5608 struct timespec absTime;
5609 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
5610 return;
5611 }
5612 if (time > 0) {
5613 unpackTime(&absTime, isAbsolute, time);
5614 }
5617 // Enter safepoint region
5618 // Beware of deadlocks such as 6317397.
5619 // The per-thread Parker:: mutex is a classic leaf-lock.
5620 // In particular a thread must never block on the Threads_lock while
5621 // holding the Parker:: mutex. If safepoints are pending both the
5622 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5623 ThreadBlockInVM tbivm(jt);
5625 // Don't wait if cannot get lock since interference arises from
5626 // unblocking. Also. check interrupt before trying wait
5627 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
5628 return;
5629 }
5631 int status ;
5632 if (_counter > 0) { // no wait needed
5633 _counter = 0;
5634 status = pthread_mutex_unlock(_mutex);
5635 assert (status == 0, "invariant") ;
5636 OrderAccess::fence();
5637 return;
5638 }
5640 #ifdef ASSERT
5641 // Don't catch signals while blocked; let the running threads have the signals.
5642 // (This allows a debugger to break into the running thread.)
5643 sigset_t oldsigs;
5644 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals();
5645 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5646 #endif
5648 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5649 jt->set_suspend_equivalent();
5650 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5652 if (time == 0) {
5653 status = pthread_cond_wait (_cond, _mutex) ;
5654 } else {
5655 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ;
5656 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
5657 pthread_cond_destroy (_cond) ;
5658 pthread_cond_init (_cond, NULL);
5659 }
5660 }
5661 assert_status(status == 0 || status == EINTR ||
5662 status == ETIMEDOUT,
5663 status, "cond_timedwait");
5665 #ifdef ASSERT
5666 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
5667 #endif
5669 _counter = 0 ;
5670 status = pthread_mutex_unlock(_mutex) ;
5671 assert_status(status == 0, status, "invariant") ;
5672 // If externally suspended while waiting, re-suspend
5673 if (jt->handle_special_suspend_equivalent_condition()) {
5674 jt->java_suspend_self();
5675 }
5677 OrderAccess::fence();
5678 }
5680 void Parker::unpark() {
5681 int s, status ;
5682 status = pthread_mutex_lock(_mutex);
5683 assert (status == 0, "invariant") ;
5684 s = _counter;
5685 _counter = 1;
5686 if (s < 1) {
5687 if (WorkAroundNPTLTimedWaitHang) {
5688 status = pthread_cond_signal (_cond) ;
5689 assert (status == 0, "invariant") ;
5690 status = pthread_mutex_unlock(_mutex);
5691 assert (status == 0, "invariant") ;
5692 } else {
5693 status = pthread_mutex_unlock(_mutex);
5694 assert (status == 0, "invariant") ;
5695 status = pthread_cond_signal (_cond) ;
5696 assert (status == 0, "invariant") ;
5697 }
5698 } else {
5699 pthread_mutex_unlock(_mutex);
5700 assert (status == 0, "invariant") ;
5701 }
5702 }
5705 /* Darwin has no "environ" in a dynamic library. */
5706 #ifdef __APPLE__
5707 #include <crt_externs.h>
5708 #define environ (*_NSGetEnviron())
5709 #else
5710 extern char** environ;
5711 #endif
5713 // Run the specified command in a separate process. Return its exit value,
5714 // or -1 on failure (e.g. can't fork a new process).
5715 // Unlike system(), this function can be called from signal handler. It
5716 // doesn't block SIGINT et al.
5717 int os::fork_and_exec(char* cmd) {
5718 const char * argv[4] = {"sh", "-c", cmd, NULL};
5720 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
5721 // pthread_atfork handlers and reset pthread library. All we need is a
5722 // separate process to execve. Make a direct syscall to fork process.
5723 // On IA64 there's no fork syscall, we have to use fork() and hope for
5724 // the best...
5725 pid_t pid = fork();
5727 if (pid < 0) {
5728 // fork failed
5729 return -1;
5731 } else if (pid == 0) {
5732 // child process
5734 // execve() in BsdThreads will call pthread_kill_other_threads_np()
5735 // first to kill every thread on the thread list. Because this list is
5736 // not reset by fork() (see notes above), execve() will instead kill
5737 // every thread in the parent process. We know this is the only thread
5738 // in the new process, so make a system call directly.
5739 // IA64 should use normal execve() from glibc to match the glibc fork()
5740 // above.
5741 execve("/bin/sh", (char* const*)argv, environ);
5743 // execve failed
5744 _exit(-1);
5746 } else {
5747 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5748 // care about the actual exit code, for now.
5750 int status;
5752 // Wait for the child process to exit. This returns immediately if
5753 // the child has already exited. */
5754 while (waitpid(pid, &status, 0) < 0) {
5755 switch (errno) {
5756 case ECHILD: return 0;
5757 case EINTR: break;
5758 default: return -1;
5759 }
5760 }
5762 if (WIFEXITED(status)) {
5763 // The child exited normally; get its exit code.
5764 return WEXITSTATUS(status);
5765 } else if (WIFSIGNALED(status)) {
5766 // The child exited because of a signal
5767 // The best value to return is 0x80 + signal number,
5768 // because that is what all Unix shells do, and because
5769 // it allows callers to distinguish between process exit and
5770 // process death by signal.
5771 return 0x80 + WTERMSIG(status);
5772 } else {
5773 // Unknown exit code; pass it through
5774 return status;
5775 }
5776 }
5777 }
5779 // is_headless_jre()
5780 //
5781 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5782 // in order to report if we are running in a headless jre
5783 //
5784 // Since JDK8 xawt/libmawt.so was moved into the same directory
5785 // as libawt.so, and renamed libawt_xawt.so
5786 //
5787 bool os::is_headless_jre() {
5788 struct stat statbuf;
5789 char buf[MAXPATHLEN];
5790 char libmawtpath[MAXPATHLEN];
5791 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX;
5792 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX;
5793 char *p;
5795 // Get path to libjvm.so
5796 os::jvm_path(buf, sizeof(buf));
5798 // Get rid of libjvm.so
5799 p = strrchr(buf, '/');
5800 if (p == NULL) return false;
5801 else *p = '\0';
5803 // Get rid of client or server
5804 p = strrchr(buf, '/');
5805 if (p == NULL) return false;
5806 else *p = '\0';
5808 // check xawt/libmawt.so
5809 strcpy(libmawtpath, buf);
5810 strcat(libmawtpath, xawtstr);
5811 if (::stat(libmawtpath, &statbuf) == 0) return false;
5813 // check libawt_xawt.so
5814 strcpy(libmawtpath, buf);
5815 strcat(libmawtpath, new_xawtstr);
5816 if (::stat(libmawtpath, &statbuf) == 0) return false;
5818 return true;
5819 }