-
Notifications
You must be signed in to change notification settings - Fork 5.4k
/
os_bsd.cpp
2630 lines (2219 loc) · 80.8 KB
/
os_bsd.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
// no precompiled headers
#include "jvm.h"
#include "classfile/vmSymbols.hpp"
#include "code/icBuffer.hpp"
#include "code/vtableStubs.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/disassembler.hpp"
#include "interpreter/interpreter.hpp"
#include "jvmtifiles/jvmti.h"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/filemap.hpp"
#include "oops/oop.inline.hpp"
#include "os_bsd.inline.hpp"
#include "os_posix.inline.hpp"
#include "os_share_bsd.hpp"
#include "prims/jniFastGetField.hpp"
#include "prims/jvm_misc.hpp"
#include "runtime/arguments.hpp"
#include "runtime/atomic.hpp"
#include "runtime/globals.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/objectMonitor.hpp"
#include "runtime/osThread.hpp"
#include "runtime/perfMemory.hpp"
#include "runtime/semaphore.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/statSampler.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/threadCritical.hpp"
#include "runtime/timer.hpp"
#include "services/attachListener.hpp"
#include "services/memTracker.hpp"
#include "services/runtimeService.hpp"
#include "signals_posix.hpp"
#include "utilities/align.hpp"
#include "utilities/decoder.hpp"
#include "utilities/defaultStream.hpp"
#include "utilities/events.hpp"
#include "utilities/growableArray.hpp"
#include "utilities/vmError.hpp"
// put OS-includes here
# include <dlfcn.h>
# include <errno.h>
# include <fcntl.h>
# include <inttypes.h>
# include <poll.h>
# include <pthread.h>
# include <pwd.h>
# include <signal.h>
# include <stdint.h>
# include <stdio.h>
# include <string.h>
# include <sys/ioctl.h>
# include <sys/mman.h>
# include <sys/param.h>
# include <sys/resource.h>
# include <sys/socket.h>
# include <sys/stat.h>
# include <sys/syscall.h>
# include <sys/sysctl.h>
# include <sys/time.h>
# include <sys/times.h>
# include <sys/types.h>
# include <time.h>
# include <unistd.h>
#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <elf.h>
#endif
#ifdef __APPLE__
#include <mach-o/dyld.h>
#endif
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
#define MAX_PATH (2 * K)
// for timer info max values which include all bits
#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
////////////////////////////////////////////////////////////////////////////////
// global variables
julong os::Bsd::_physical_memory = 0;
#ifdef __APPLE__
mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
volatile uint64_t os::Bsd::_max_abstime = 0;
#endif
pthread_t os::Bsd::_main_thread;
int os::Bsd::_page_size = -1;
static jlong initial_time_count=0;
static int clock_tics_per_sec = 100;
#ifdef __APPLE__
static const int processor_id_unassigned = -1;
static const int processor_id_assigning = -2;
static const int processor_id_map_size = 256;
static volatile int processor_id_map[processor_id_map_size];
static volatile int processor_id_next = 0;
#endif
////////////////////////////////////////////////////////////////////////////////
// utility functions
julong os::available_memory() {
return Bsd::available_memory();
}
// available here means free
julong os::Bsd::available_memory() {
uint64_t available = physical_memory() >> 2;
#ifdef __APPLE__
mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
vm_statistics64_data_t vmstat;
kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
(host_info64_t)&vmstat, &count);
assert(kerr == KERN_SUCCESS,
"host_statistics64 failed - check mach_host_self() and count");
if (kerr == KERN_SUCCESS) {
available = vmstat.free_count * os::vm_page_size();
}
#endif
return available;
}
// for more info see :
// https://man.openbsd.org/sysctl.2
void os::Bsd::print_uptime_info(outputStream* st) {
struct timeval boottime;
size_t len = sizeof(boottime);
int mib[2];
mib[0] = CTL_KERN;
mib[1] = KERN_BOOTTIME;
if (sysctl(mib, 2, &boottime, &len, NULL, 0) >= 0) {
time_t bootsec = boottime.tv_sec;
time_t currsec = time(NULL);
os::print_dhm(st, "OS uptime:", (long) difftime(currsec, bootsec));
}
}
julong os::physical_memory() {
return Bsd::physical_memory();
}
// Return true if user is running as root.
bool os::have_special_privileges() {
static bool init = false;
static bool privileges = false;
if (!init) {
privileges = (getuid() != geteuid()) || (getgid() != getegid());
init = true;
}
return privileges;
}
// Cpu architecture string
#if defined(ZERO)
static char cpu_arch[] = ZERO_LIBARCH;
#elif defined(IA64)
static char cpu_arch[] = "ia64";
#elif defined(IA32)
static char cpu_arch[] = "i386";
#elif defined(AMD64)
static char cpu_arch[] = "amd64";
#elif defined(ARM)
static char cpu_arch[] = "arm";
#elif defined(AARCH64)
static char cpu_arch[] = "aarch64";
#elif defined(PPC32)
static char cpu_arch[] = "ppc";
#else
#error Add appropriate cpu_arch setting
#endif
// Compiler variant
#ifdef COMPILER2
#define COMPILER_VARIANT "server"
#else
#define COMPILER_VARIANT "client"
#endif
void os::Bsd::initialize_system_info() {
int mib[2];
size_t len;
int cpu_val;
julong mem_val;
// get processors count via hw.ncpus sysctl
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
len = sizeof(cpu_val);
if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
assert(len == sizeof(cpu_val), "unexpected data size");
set_processor_count(cpu_val);
} else {
set_processor_count(1); // fallback
}
#ifdef __APPLE__
// initialize processor id map
for (int i = 0; i < processor_id_map_size; i++) {
processor_id_map[i] = processor_id_unassigned;
}
#endif
// get physical memory via hw.memsize sysctl (hw.memsize is used
// since it returns a 64 bit value)
mib[0] = CTL_HW;
#if defined (HW_MEMSIZE) // Apple
mib[1] = HW_MEMSIZE;
#elif defined(HW_PHYSMEM) // Most of BSD
mib[1] = HW_PHYSMEM;
#elif defined(HW_REALMEM) // Old FreeBSD
mib[1] = HW_REALMEM;
#else
#error No ways to get physmem
#endif
len = sizeof(mem_val);
if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
assert(len == sizeof(mem_val), "unexpected data size");
_physical_memory = mem_val;
} else {
_physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
}
#ifdef __OpenBSD__
{
// limit _physical_memory memory view on OpenBSD since
// datasize rlimit restricts us anyway.
struct rlimit limits;
getrlimit(RLIMIT_DATA, &limits);
_physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
}
#endif
}
#ifdef __APPLE__
static const char *get_home() {
const char *home_dir = ::getenv("HOME");
if ((home_dir == NULL) || (*home_dir == '\0')) {
struct passwd *passwd_info = getpwuid(geteuid());
if (passwd_info != NULL) {
home_dir = passwd_info->pw_dir;
}
}
return home_dir;
}
#endif
void os::init_system_properties_values() {
// The next steps are taken in the product version:
//
// Obtain the JAVA_HOME value from the location of libjvm.so.
// This library should be located at:
// <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
//
// If "/jre/lib/" appears at the right place in the path, then we
// assume libjvm.so is installed in a JDK and we use this path.
//
// Otherwise exit with message: "Could not create the Java virtual machine."
//
// The following extra steps are taken in the debugging version:
//
// If "/jre/lib/" does NOT appear at the right place in the path
// instead of exit check for $JAVA_HOME environment variable.
//
// If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
// then we append a fake suffix "hotspot/libjvm.so" to this path so
// it looks like libjvm.so is installed there
// <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
//
// Otherwise exit.
//
// Important note: if the location of libjvm.so changes this
// code needs to be changed accordingly.
// See ld(1):
// The linker uses the following search paths to locate required
// shared libraries:
// 1: ...
// ...
// 7: The default directories, normally /lib and /usr/lib.
#ifndef DEFAULT_LIBPATH
#ifndef OVERRIDE_LIBPATH
#define DEFAULT_LIBPATH "/lib:/usr/lib"
#else
#define DEFAULT_LIBPATH OVERRIDE_LIBPATH
#endif
#endif
// Base path of extensions installed on the system.
#define SYS_EXT_DIR "/usr/java/packages"
#define EXTENSIONS_DIR "/lib/ext"
#ifndef __APPLE__
// Buffer that fits several sprintfs.
// Note that the space for the colon and the trailing null are provided
// by the nulls included by the sizeof operator.
const size_t bufsize =
MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
(size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
// sysclasspath, java_home, dll_dir
{
char *pslash;
os::jvm_path(buf, bufsize);
// Found the full path to libjvm.so.
// Now cut the path to <java_home>/jre if we can.
*(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
pslash = strrchr(buf, '/');
if (pslash != NULL) {
*pslash = '\0'; // Get rid of /{client|server|hotspot}.
}
Arguments::set_dll_dir(buf);
if (pslash != NULL) {
pslash = strrchr(buf, '/');
if (pslash != NULL) {
*pslash = '\0'; // Get rid of /<arch>.
pslash = strrchr(buf, '/');
if (pslash != NULL) {
*pslash = '\0'; // Get rid of /lib.
}
}
}
Arguments::set_java_home(buf);
if (!set_boot_path('/', ':')) {
vm_exit_during_initialization("Failed setting boot class path.", NULL);
}
}
// Where to look for native libraries.
//
// Note: Due to a legacy implementation, most of the library path
// is set in the launcher. This was to accomodate linking restrictions
// on legacy Bsd implementations (which are no longer supported).
// Eventually, all the library path setting will be done here.
//
// However, to prevent the proliferation of improperly built native
// libraries, the new path component /usr/java/packages is added here.
// Eventually, all the library path setting will be done here.
{
// Get the user setting of LD_LIBRARY_PATH, and prepended it. It
// should always exist (until the legacy problem cited above is
// addressed).
const char *v = ::getenv("LD_LIBRARY_PATH");
const char *v_colon = ":";
if (v == NULL) { v = ""; v_colon = ""; }
// That's +1 for the colon and +1 for the trailing '\0'.
char *ld_library_path = NEW_C_HEAP_ARRAY(char,
strlen(v) + 1 +
sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
mtInternal);
sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
Arguments::set_library_path(ld_library_path);
FREE_C_HEAP_ARRAY(char, ld_library_path);
}
// Extensions directories.
sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
Arguments::set_ext_dirs(buf);
FREE_C_HEAP_ARRAY(char, buf);
#else // __APPLE__
#define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
#define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
const char *user_home_dir = get_home();
// The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
sizeof(SYS_EXTENSIONS_DIRS);
// Buffer that fits several sprintfs.
// Note that the space for the colon and the trailing null are provided
// by the nulls included by the sizeof operator.
const size_t bufsize =
MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
(size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
// sysclasspath, java_home, dll_dir
{
char *pslash;
os::jvm_path(buf, bufsize);
// Found the full path to libjvm.so.
// Now cut the path to <java_home>/jre if we can.
*(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
pslash = strrchr(buf, '/');
if (pslash != NULL) {
*pslash = '\0'; // Get rid of /{client|server|hotspot}.
}
#ifdef STATIC_BUILD
strcat(buf, "/lib");
#endif
Arguments::set_dll_dir(buf);
if (pslash != NULL) {
pslash = strrchr(buf, '/');
if (pslash != NULL) {
*pslash = '\0'; // Get rid of /lib.
}
}
Arguments::set_java_home(buf);
set_boot_path('/', ':');
}
// Where to look for native libraries.
//
// Note: Due to a legacy implementation, most of the library path
// is set in the launcher. This was to accomodate linking restrictions
// on legacy Bsd implementations (which are no longer supported).
// Eventually, all the library path setting will be done here.
//
// However, to prevent the proliferation of improperly built native
// libraries, the new path component /usr/java/packages is added here.
// Eventually, all the library path setting will be done here.
{
// Get the user setting of LD_LIBRARY_PATH, and prepended it. It
// should always exist (until the legacy problem cited above is
// addressed).
// Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
// can specify a directory inside an app wrapper
const char *l = ::getenv("JAVA_LIBRARY_PATH");
const char *l_colon = ":";
if (l == NULL) { l = ""; l_colon = ""; }
const char *v = ::getenv("DYLD_LIBRARY_PATH");
const char *v_colon = ":";
if (v == NULL) { v = ""; v_colon = ""; }
// Apple's Java6 has "." at the beginning of java.library.path.
// OpenJDK on Windows has "." at the end of java.library.path.
// OpenJDK on Linux and Solaris don't have "." in java.library.path
// at all. To ease the transition from Apple's Java6 to OpenJDK7,
// "." is appended to the end of java.library.path. Yes, this
// could cause a change in behavior, but Apple's Java6 behavior
// can be achieved by putting "." at the beginning of the
// JAVA_LIBRARY_PATH environment variable.
char *ld_library_path = NEW_C_HEAP_ARRAY(char,
strlen(v) + 1 + strlen(l) + 1 +
system_ext_size + 3,
mtInternal);
sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
v, v_colon, l, l_colon, user_home_dir);
Arguments::set_library_path(ld_library_path);
FREE_C_HEAP_ARRAY(char, ld_library_path);
}
// Extensions directories.
//
// Note that the space for the colon and the trailing null are provided
// by the nulls included by the sizeof operator (so actually one byte more
// than necessary is allocated).
sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
user_home_dir, Arguments::get_java_home());
Arguments::set_ext_dirs(buf);
FREE_C_HEAP_ARRAY(char, buf);
#undef SYS_EXTENSIONS_DIR
#undef SYS_EXTENSIONS_DIRS
#endif // __APPLE__
#undef SYS_EXT_DIR
#undef EXTENSIONS_DIR
}
////////////////////////////////////////////////////////////////////////////////
// breakpoint support
void os::breakpoint() {
BREAKPOINT;
}
extern "C" void breakpoint() {
// use debugger to set breakpoint here
}
//////////////////////////////////////////////////////////////////////////////
// create new thread
#ifdef __APPLE__
// library handle for calling objc_registerThreadWithCollector()
// without static linking to the libobjc library
#define OBJC_LIB "/usr/lib/libobjc.dylib"
#define OBJC_GCREGISTER "objc_registerThreadWithCollector"
typedef void (*objc_registerThreadWithCollector_t)();
extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
#endif
// Thread start routine for all newly created threads
static void *thread_native_entry(Thread *thread) {
thread->record_stack_base_and_size();
// Try to randomize the cache line index of hot stack frames.
// This helps when threads of the same stack traces evict each other's
// cache lines. The threads can be either from the same JVM instance, or
// from different JVM instances. The benefit is especially true for
// processors with hyperthreading technology.
static int counter = 0;
int pid = os::current_process_id();
alloca(((pid ^ counter++) & 7) * 128);
thread->initialize_thread_current();
OSThread* osthread = thread->osthread();
Monitor* sync = osthread->startThread_lock();
osthread->set_thread_id(os::Bsd::gettid());
log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
os::current_thread_id(), (uintx) pthread_self());
#ifdef __APPLE__
// Store unique OS X thread id used by SA
osthread->set_unique_thread_id();
#endif
// initialize signal mask for this thread
PosixSignals::hotspot_sigmask(thread);
// initialize floating point control register
os::Bsd::init_thread_fpu_state();
#ifdef __APPLE__
// register thread with objc gc
if (objc_registerThreadWithCollectorFunction != NULL) {
objc_registerThreadWithCollectorFunction();
}
#endif
// handshaking with parent thread
{
MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
// notify parent thread
osthread->set_state(INITIALIZED);
sync->notify_all();
// wait until os::start_thread()
while (osthread->get_state() == INITIALIZED) {
sync->wait_without_safepoint_check();
}
}
// call one more level start routine
thread->call_run();
// Note: at this point the thread object may already have deleted itself.
// Prevent dereferencing it from here on out.
thread = NULL;
log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
os::current_thread_id(), (uintx) pthread_self());
return 0;
}
bool os::create_thread(Thread* thread, ThreadType thr_type,
size_t req_stack_size) {
assert(thread->osthread() == NULL, "caller responsible");
// Allocate the OSThread object
OSThread* osthread = new OSThread(NULL, NULL);
if (osthread == NULL) {
return false;
}
// set the correct thread state
osthread->set_thread_type(thr_type);
// Initial state is ALLOCATED but not INITIALIZED
osthread->set_state(ALLOCATED);
thread->set_osthread(osthread);
// init thread attributes
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
// calculate stack size if it's not specified by caller
size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
int status = pthread_attr_setstacksize(&attr, stack_size);
assert_status(status == 0, status, "pthread_attr_setstacksize");
ThreadState state;
{
pthread_t tid;
int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
char buf[64];
if (ret == 0) {
log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
(uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
} else {
log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
// Log some OS information which might explain why creating the thread failed.
log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
LogStream st(Log(os, thread)::info());
os::Posix::print_rlimit_info(&st);
os::print_memory_info(&st);
}
pthread_attr_destroy(&attr);
if (ret != 0) {
// Need to clean up stuff we've allocated so far
thread->set_osthread(NULL);
delete osthread;
return false;
}
// Store pthread info into the OSThread
osthread->set_pthread_id(tid);
// Wait until child thread is either initialized or aborted
{
Monitor* sync_with_child = osthread->startThread_lock();
MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
while ((state = osthread->get_state()) == ALLOCATED) {
sync_with_child->wait_without_safepoint_check();
}
}
}
// The thread is returned suspended (in state INITIALIZED),
// and is started higher up in the call chain
assert(state == INITIALIZED, "race condition");
return true;
}
/////////////////////////////////////////////////////////////////////////////
// attach existing thread
// bootstrap the main thread
bool os::create_main_thread(JavaThread* thread) {
assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
return create_attached_thread(thread);
}
bool os::create_attached_thread(JavaThread* thread) {
#ifdef ASSERT
thread->verify_not_published();
#endif
// Allocate the OSThread object
OSThread* osthread = new OSThread(NULL, NULL);
if (osthread == NULL) {
return false;
}
osthread->set_thread_id(os::Bsd::gettid());
#ifdef __APPLE__
// Store unique OS X thread id used by SA
osthread->set_unique_thread_id();
#endif
// Store pthread info into the OSThread
osthread->set_pthread_id(::pthread_self());
// initialize floating point control register
os::Bsd::init_thread_fpu_state();
// Initial thread state is RUNNABLE
osthread->set_state(RUNNABLE);
thread->set_osthread(osthread);
// initialize signal mask for this thread
// and save the caller's signal mask
PosixSignals::hotspot_sigmask(thread);
log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
os::current_thread_id(), (uintx) pthread_self());
return true;
}
void os::pd_start_thread(Thread* thread) {
OSThread * osthread = thread->osthread();
assert(osthread->get_state() != INITIALIZED, "just checking");
Monitor* sync_with_child = osthread->startThread_lock();
MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
sync_with_child->notify();
}
// Free Bsd resources related to the OSThread
void os::free_thread(OSThread* osthread) {
assert(osthread != NULL, "osthread not set");
// We are told to free resources of the argument thread,
// but we can only really operate on the current thread.
assert(Thread::current()->osthread() == osthread,
"os::free_thread but not current thread");
// Restore caller's signal mask
sigset_t sigmask = osthread->caller_sigmask();
pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
delete osthread;
}
////////////////////////////////////////////////////////////////////////////////
// time support
// Time since start-up in seconds to a fine granularity.
// Used by VMSelfDestructTimer and the MemProfiler.
double os::elapsedTime() {
return ((double)os::elapsed_counter()) / os::elapsed_frequency();
}
jlong os::elapsed_counter() {
return javaTimeNanos() - initial_time_count;
}
jlong os::elapsed_frequency() {
return NANOSECS_PER_SEC; // nanosecond resolution
}
bool os::supports_vtime() { return true; }
double os::elapsedVTime() {
// better than nothing, but not much
return elapsedTime();
}
#ifdef __APPLE__
void os::Bsd::clock_init() {
mach_timebase_info(&_timebase_info);
}
#else
void os::Bsd::clock_init() {
// Nothing to do
}
#endif
#ifdef __APPLE__
jlong os::javaTimeNanos() {
const uint64_t tm = mach_absolute_time();
const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
const uint64_t prev = Bsd::_max_abstime;
if (now <= prev) {
return prev; // same or retrograde time;
}
const uint64_t obsv = Atomic::cmpxchg(&Bsd::_max_abstime, prev, now);
assert(obsv >= prev, "invariant"); // Monotonicity
// If the CAS succeeded then we're done and return "now".
// If the CAS failed and the observed value "obsv" is >= now then
// we should return "obsv". If the CAS failed and now > obsv > prv then
// some other thread raced this thread and installed a new value, in which case
// we could either (a) retry the entire operation, (b) retry trying to install now
// or (c) just return obsv. We use (c). No loop is required although in some cases
// we might discard a higher "now" value in deference to a slightly lower but freshly
// installed obsv value. That's entirely benign -- it admits no new orderings compared
// to (a) or (b) -- and greatly reduces coherence traffic.
// We might also condition (c) on the magnitude of the delta between obsv and now.
// Avoiding excessive CAS operations to hot RW locations is critical.
// See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
return (prev == obsv) ? now : obsv;
}
void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
info_ptr->max_value = ALL_64_BITS;
info_ptr->may_skip_backward = false; // not subject to resetting or drifting
info_ptr->may_skip_forward = false; // not subject to resetting or drifting
info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
}
#endif // __APPLE__
// Return the real, user, and system times in seconds from an
// arbitrary fixed point in the past.
bool os::getTimesSecs(double* process_real_time,
double* process_user_time,
double* process_system_time) {
struct tms ticks;
clock_t real_ticks = times(&ticks);
if (real_ticks == (clock_t) (-1)) {
return false;
} else {
double ticks_per_second = (double) clock_tics_per_sec;
*process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
*process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
*process_real_time = ((double) real_ticks) / ticks_per_second;
return true;
}
}
char * os::local_time_string(char *buf, size_t buflen) {
struct tm t;
time_t long_time;
time(&long_time);
localtime_r(&long_time, &t);
jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
t.tm_hour, t.tm_min, t.tm_sec);
return buf;
}
struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
return localtime_r(clock, res);
}
// Information of current thread in variety of formats
pid_t os::Bsd::gettid() {
int retval = -1;
#ifdef __APPLE__ // XNU kernel
mach_port_t port = mach_thread_self();
guarantee(MACH_PORT_VALID(port), "just checking");
mach_port_deallocate(mach_task_self(), port);
return (pid_t)port;
#else
#ifdef __FreeBSD__
retval = syscall(SYS_thr_self);
#else
#ifdef __OpenBSD__
retval = syscall(SYS_getthrid);
#else
#ifdef __NetBSD__
retval = (pid_t) syscall(SYS__lwp_self);
#endif
#endif
#endif
#endif
if (retval == -1) {
return getpid();
}
}
intx os::current_thread_id() {
#ifdef __APPLE__
return (intx)os::Bsd::gettid();
#else
return (intx)::pthread_self();
#endif
}
int os::current_process_id() {
return (int)(getpid());
}
// DLL functions
const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
// This must be hard coded because it's the system's temporary
// directory not the java application's temp directory, ala java.io.tmpdir.
#ifdef __APPLE__
// macosx has a secure per-user temporary directory
char temp_path_storage[PATH_MAX];
const char* os::get_temp_directory() {
static char *temp_path = NULL;
if (temp_path == NULL) {
int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
if (pathSize == 0 || pathSize > PATH_MAX) {
strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
}
temp_path = temp_path_storage;
}
return temp_path;
}
#else // __APPLE__
const char* os::get_temp_directory() { return "/tmp"; }
#endif // __APPLE__
// check if addr is inside libjvm.so
bool os::address_is_in_vm(address addr) {
static address libjvm_base_addr;
Dl_info dlinfo;
if (libjvm_base_addr == NULL) {
if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
libjvm_base_addr = (address)dlinfo.dli_fbase;
}
assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
}
if (dladdr((void *)addr, &dlinfo) != 0) {
if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
}
return false;
}
#define MACH_MAXSYMLEN 256
bool os::dll_address_to_function_name(address addr, char *buf,
int buflen, int *offset,
bool demangle) {
// buf is not optional, but offset is optional
assert(buf != NULL, "sanity check");
Dl_info dlinfo;
char localbuf[MACH_MAXSYMLEN];
if (dladdr((void*)addr, &dlinfo) != 0) {
// see if we have a matching symbol
if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
}
if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
return true;
}
// no matching symbol so try for just file info
if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
buf, buflen, offset, dlinfo.dli_fname, demangle)) {
return true;
}
}
// Handle non-dynamic manually:
if (dlinfo.dli_fbase != NULL &&
Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
dlinfo.dli_fbase)) {
if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
jio_snprintf(buf, buflen, "%s", localbuf);
}
return true;
}
}
buf[0] = '\0';
if (offset != NULL) *offset = -1;
return false;
}
// ported from solaris version