Thu, 12 Oct 2017 21:27:07 +0800
merge
1 /*
2 * Copyright (c) 1997, 2014, 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 "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_solaris.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_solaris.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "prims/jniFastGetField.hpp"
41 #include "prims/jvm.h"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/orderAccess.inline.hpp"
52 #include "runtime/osThread.hpp"
53 #include "runtime/perfMemory.hpp"
54 #include "runtime/sharedRuntime.hpp"
55 #include "runtime/statSampler.hpp"
56 #include "runtime/stubRoutines.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/threadCritical.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/attachListener.hpp"
61 #include "services/memTracker.hpp"
62 #include "services/runtimeService.hpp"
63 #include "utilities/decoder.hpp"
64 #include "utilities/defaultStream.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/growableArray.hpp"
67 #include "utilities/vmError.hpp"
69 // put OS-includes here
70 # include <dlfcn.h>
71 # include <errno.h>
72 # include <exception>
73 # include <link.h>
74 # include <poll.h>
75 # include <pthread.h>
76 # include <pwd.h>
77 # include <schedctl.h>
78 # include <setjmp.h>
79 # include <signal.h>
80 # include <stdio.h>
81 # include <alloca.h>
82 # include <sys/filio.h>
83 # include <sys/ipc.h>
84 # include <sys/lwp.h>
85 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
86 # include <sys/mman.h>
87 # include <sys/processor.h>
88 # include <sys/procset.h>
89 # include <sys/pset.h>
90 # include <sys/resource.h>
91 # include <sys/shm.h>
92 # include <sys/socket.h>
93 # include <sys/stat.h>
94 # include <sys/systeminfo.h>
95 # include <sys/time.h>
96 # include <sys/times.h>
97 # include <sys/types.h>
98 # include <sys/wait.h>
99 # include <sys/utsname.h>
100 # include <thread.h>
101 # include <unistd.h>
102 # include <sys/priocntl.h>
103 # include <sys/rtpriocntl.h>
104 # include <sys/tspriocntl.h>
105 # include <sys/iapriocntl.h>
106 # include <sys/fxpriocntl.h>
107 # include <sys/loadavg.h>
108 # include <string.h>
109 # include <stdio.h>
111 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
112 # include <sys/procfs.h> // see comment in <sys/procfs.h>
114 #define MAX_PATH (2 * K)
116 // for timer info max values which include all bits
117 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
120 // Here are some liblgrp types from sys/lgrp_user.h to be able to
121 // compile on older systems without this header file.
123 #ifndef MADV_ACCESS_LWP
124 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
125 #endif
126 #ifndef MADV_ACCESS_MANY
127 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
128 #endif
130 #ifndef LGRP_RSRC_CPU
131 # define LGRP_RSRC_CPU 0 /* CPU resources */
132 #endif
133 #ifndef LGRP_RSRC_MEM
134 # define LGRP_RSRC_MEM 1 /* memory resources */
135 #endif
137 // see thr_setprio(3T) for the basis of these numbers
138 #define MinimumPriority 0
139 #define NormalPriority 64
140 #define MaximumPriority 127
142 // Values for ThreadPriorityPolicy == 1
143 int prio_policy1[CriticalPriority+1] = {
144 -99999, 0, 16, 32, 48, 64,
145 80, 96, 112, 124, 127, 127 };
147 // System parameters used internally
148 static clock_t clock_tics_per_sec = 100;
150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
151 static bool enabled_extended_FILE_stdio = false;
153 // For diagnostics to print a message once. see run_periodic_checks
154 static bool check_addr0_done = false;
155 static sigset_t check_signal_done;
156 static bool check_signals = true;
158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
164 // "default" initializers for missing libc APIs
165 extern "C" {
166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
170 static int lwp_cond_destroy(cond_t *cv) { return 0; }
171 }
173 // "default" initializers for pthread-based synchronization
174 extern "C" {
175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
177 }
179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
181 // Thread Local Storage
182 // This is common to all Solaris platforms so it is defined here,
183 // in this common file.
184 // The declarations are in the os_cpu threadLS*.hpp files.
185 //
186 // Static member initialization for TLS
187 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
189 #ifndef PRODUCT
190 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
192 int ThreadLocalStorage::_tcacheHit = 0;
193 int ThreadLocalStorage::_tcacheMiss = 0;
195 void ThreadLocalStorage::print_statistics() {
196 int total = _tcacheMiss+_tcacheHit;
197 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
198 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
199 }
200 #undef _PCT
201 #endif // PRODUCT
203 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
204 int index) {
205 Thread *thread = get_thread_slow();
206 if (thread != NULL) {
207 address sp = os::current_stack_pointer();
208 guarantee(thread->_stack_base == NULL ||
209 (sp <= thread->_stack_base &&
210 sp >= thread->_stack_base - thread->_stack_size) ||
211 is_error_reported(),
212 "sp must be inside of selected thread stack");
214 thread->set_self_raw_id(raw_id); // mark for quick retrieval
215 _get_thread_cache[ index ] = thread;
216 }
217 return thread;
218 }
221 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
222 #define NO_CACHED_THREAD ((Thread*)all_zero)
224 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
226 // Store the new value before updating the cache to prevent a race
227 // between get_thread_via_cache_slowly() and this store operation.
228 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
230 // Update thread cache with new thread if setting on thread create,
231 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
232 uintptr_t raw = pd_raw_thread_id();
233 int ix = pd_cache_index(raw);
234 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
235 }
237 void ThreadLocalStorage::pd_init() {
238 for (int i = 0; i < _pd_cache_size; i++) {
239 _get_thread_cache[i] = NO_CACHED_THREAD;
240 }
241 }
243 // Invalidate all the caches (happens to be the same as pd_init).
244 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
246 #undef NO_CACHED_THREAD
248 // END Thread Local Storage
250 static inline size_t adjust_stack_size(address base, size_t size) {
251 if ((ssize_t)size < 0) {
252 // 4759953: Compensate for ridiculous stack size.
253 size = max_intx;
254 }
255 if (size > (size_t)base) {
256 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
257 size = (size_t)base;
258 }
259 return size;
260 }
262 static inline stack_t get_stack_info() {
263 stack_t st;
264 int retval = thr_stksegment(&st);
265 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
266 assert(retval == 0, "incorrect return value from thr_stksegment");
267 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
268 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
269 return st;
270 }
272 address os::current_stack_base() {
273 int r = thr_main() ;
274 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
275 bool is_primordial_thread = r;
277 // Workaround 4352906, avoid calls to thr_stksegment by
278 // thr_main after the first one (it looks like we trash
279 // some data, causing the value for ss_sp to be incorrect).
280 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
281 stack_t st = get_stack_info();
282 if (is_primordial_thread) {
283 // cache initial value of stack base
284 os::Solaris::_main_stack_base = (address)st.ss_sp;
285 }
286 return (address)st.ss_sp;
287 } else {
288 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
289 return os::Solaris::_main_stack_base;
290 }
291 }
293 size_t os::current_stack_size() {
294 size_t size;
296 int r = thr_main() ;
297 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
298 if(!r) {
299 size = get_stack_info().ss_size;
300 } else {
301 struct rlimit limits;
302 getrlimit(RLIMIT_STACK, &limits);
303 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
304 }
305 // base may not be page aligned
306 address base = current_stack_base();
307 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
308 return (size_t)(base - bottom);
309 }
311 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
312 return localtime_r(clock, res);
313 }
315 // interruptible infrastructure
317 // setup_interruptible saves the thread state before going into an
318 // interruptible system call.
319 // The saved state is used to restore the thread to
320 // its former state whether or not an interrupt is received.
321 // Used by classloader os::read
322 // os::restartable_read calls skip this layer and stay in _thread_in_native
324 void os::Solaris::setup_interruptible(JavaThread* thread) {
326 JavaThreadState thread_state = thread->thread_state();
328 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
329 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
330 OSThread* osthread = thread->osthread();
331 osthread->set_saved_interrupt_thread_state(thread_state);
332 thread->frame_anchor()->make_walkable(thread);
333 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
334 }
336 // Version of setup_interruptible() for threads that are already in
337 // _thread_blocked. Used by os_sleep().
338 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
339 thread->frame_anchor()->make_walkable(thread);
340 }
342 JavaThread* os::Solaris::setup_interruptible() {
343 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
344 setup_interruptible(thread);
345 return thread;
346 }
348 void os::Solaris::try_enable_extended_io() {
349 typedef int (*enable_extended_FILE_stdio_t)(int, int);
351 if (!UseExtendedFileIO) {
352 return;
353 }
355 enable_extended_FILE_stdio_t enabler =
356 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
357 "enable_extended_FILE_stdio");
358 if (enabler) {
359 enabler(-1, -1);
360 }
361 }
364 #ifdef ASSERT
366 JavaThread* os::Solaris::setup_interruptible_native() {
367 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
368 JavaThreadState thread_state = thread->thread_state();
369 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
370 return thread;
371 }
373 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
374 JavaThreadState thread_state = thread->thread_state();
375 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
376 }
377 #endif
379 // cleanup_interruptible reverses the effects of setup_interruptible
380 // setup_interruptible_already_blocked() does not need any cleanup.
382 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
383 OSThread* osthread = thread->osthread();
385 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
386 }
388 // I/O interruption related counters called in _INTERRUPTIBLE
390 void os::Solaris::bump_interrupted_before_count() {
391 RuntimeService::record_interrupted_before_count();
392 }
394 void os::Solaris::bump_interrupted_during_count() {
395 RuntimeService::record_interrupted_during_count();
396 }
398 static int _processors_online = 0;
400 jint os::Solaris::_os_thread_limit = 0;
401 volatile jint os::Solaris::_os_thread_count = 0;
403 julong os::available_memory() {
404 return Solaris::available_memory();
405 }
407 julong os::Solaris::available_memory() {
408 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
409 }
411 julong os::Solaris::_physical_memory = 0;
413 julong os::physical_memory() {
414 return Solaris::physical_memory();
415 }
417 static hrtime_t first_hrtime = 0;
418 static const hrtime_t hrtime_hz = 1000*1000*1000;
419 static volatile hrtime_t max_hrtime = 0;
422 void os::Solaris::initialize_system_info() {
423 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
424 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
425 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
426 }
428 int os::active_processor_count() {
429 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
430 pid_t pid = getpid();
431 psetid_t pset = PS_NONE;
432 // Are we running in a processor set or is there any processor set around?
433 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
434 uint_t pset_cpus;
435 // Query the number of cpus available to us.
436 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
437 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
438 _processors_online = pset_cpus;
439 return pset_cpus;
440 }
441 }
442 // Otherwise return number of online cpus
443 return online_cpus;
444 }
446 static bool find_processors_in_pset(psetid_t pset,
447 processorid_t** id_array,
448 uint_t* id_length) {
449 bool result = false;
450 // Find the number of processors in the processor set.
451 if (pset_info(pset, NULL, id_length, NULL) == 0) {
452 // Make up an array to hold their ids.
453 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
454 // Fill in the array with their processor ids.
455 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
456 result = true;
457 }
458 }
459 return result;
460 }
462 // Callers of find_processors_online() must tolerate imprecise results --
463 // the system configuration can change asynchronously because of DR
464 // or explicit psradm operations.
465 //
466 // We also need to take care that the loop (below) terminates as the
467 // number of processors online can change between the _SC_NPROCESSORS_ONLN
468 // request and the loop that builds the list of processor ids. Unfortunately
469 // there's no reliable way to determine the maximum valid processor id,
470 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
471 // man pages, which claim the processor id set is "sparse, but
472 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
473 // exit the loop.
474 //
475 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
476 // not available on S8.0.
478 static bool find_processors_online(processorid_t** id_array,
479 uint* id_length) {
480 const processorid_t MAX_PROCESSOR_ID = 100000 ;
481 // Find the number of processors online.
482 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
483 // Make up an array to hold their ids.
484 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
485 // Processors need not be numbered consecutively.
486 long found = 0;
487 processorid_t next = 0;
488 while (found < *id_length && next < MAX_PROCESSOR_ID) {
489 processor_info_t info;
490 if (processor_info(next, &info) == 0) {
491 // NB, PI_NOINTR processors are effectively online ...
492 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
493 (*id_array)[found] = next;
494 found += 1;
495 }
496 }
497 next += 1;
498 }
499 if (found < *id_length) {
500 // The loop above didn't identify the expected number of processors.
501 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
502 // and re-running the loop, above, but there's no guarantee of progress
503 // if the system configuration is in flux. Instead, we just return what
504 // we've got. Note that in the worst case find_processors_online() could
505 // return an empty set. (As a fall-back in the case of the empty set we
506 // could just return the ID of the current processor).
507 *id_length = found ;
508 }
510 return true;
511 }
513 static bool assign_distribution(processorid_t* id_array,
514 uint id_length,
515 uint* distribution,
516 uint distribution_length) {
517 // We assume we can assign processorid_t's to uint's.
518 assert(sizeof(processorid_t) == sizeof(uint),
519 "can't convert processorid_t to uint");
520 // Quick check to see if we won't succeed.
521 if (id_length < distribution_length) {
522 return false;
523 }
524 // Assign processor ids to the distribution.
525 // Try to shuffle processors to distribute work across boards,
526 // assuming 4 processors per board.
527 const uint processors_per_board = ProcessDistributionStride;
528 // Find the maximum processor id.
529 processorid_t max_id = 0;
530 for (uint m = 0; m < id_length; m += 1) {
531 max_id = MAX2(max_id, id_array[m]);
532 }
533 // The next id, to limit loops.
534 const processorid_t limit_id = max_id + 1;
535 // Make up markers for available processors.
536 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
537 for (uint c = 0; c < limit_id; c += 1) {
538 available_id[c] = false;
539 }
540 for (uint a = 0; a < id_length; a += 1) {
541 available_id[id_array[a]] = true;
542 }
543 // Step by "boards", then by "slot", copying to "assigned".
544 // NEEDS_CLEANUP: The assignment of processors should be stateful,
545 // remembering which processors have been assigned by
546 // previous calls, etc., so as to distribute several
547 // independent calls of this method. What we'd like is
548 // It would be nice to have an API that let us ask
549 // how many processes are bound to a processor,
550 // but we don't have that, either.
551 // In the short term, "board" is static so that
552 // subsequent distributions don't all start at board 0.
553 static uint board = 0;
554 uint assigned = 0;
555 // Until we've found enough processors ....
556 while (assigned < distribution_length) {
557 // ... find the next available processor in the board.
558 for (uint slot = 0; slot < processors_per_board; slot += 1) {
559 uint try_id = board * processors_per_board + slot;
560 if ((try_id < limit_id) && (available_id[try_id] == true)) {
561 distribution[assigned] = try_id;
562 available_id[try_id] = false;
563 assigned += 1;
564 break;
565 }
566 }
567 board += 1;
568 if (board * processors_per_board + 0 >= limit_id) {
569 board = 0;
570 }
571 }
572 if (available_id != NULL) {
573 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
574 }
575 return true;
576 }
578 void os::set_native_thread_name(const char *name) {
579 // Not yet implemented.
580 return;
581 }
583 bool os::distribute_processes(uint length, uint* distribution) {
584 bool result = false;
585 // Find the processor id's of all the available CPUs.
586 processorid_t* id_array = NULL;
587 uint id_length = 0;
588 // There are some races between querying information and using it,
589 // since processor sets can change dynamically.
590 psetid_t pset = PS_NONE;
591 // Are we running in a processor set?
592 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
593 result = find_processors_in_pset(pset, &id_array, &id_length);
594 } else {
595 result = find_processors_online(&id_array, &id_length);
596 }
597 if (result == true) {
598 if (id_length >= length) {
599 result = assign_distribution(id_array, id_length, distribution, length);
600 } else {
601 result = false;
602 }
603 }
604 if (id_array != NULL) {
605 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
606 }
607 return result;
608 }
610 bool os::bind_to_processor(uint processor_id) {
611 // We assume that a processorid_t can be stored in a uint.
612 assert(sizeof(uint) == sizeof(processorid_t),
613 "can't convert uint to processorid_t");
614 int bind_result =
615 processor_bind(P_LWPID, // bind LWP.
616 P_MYID, // bind current LWP.
617 (processorid_t) processor_id, // id.
618 NULL); // don't return old binding.
619 return (bind_result == 0);
620 }
622 bool os::getenv(const char* name, char* buffer, int len) {
623 char* val = ::getenv( name );
624 if ( val == NULL
625 || strlen(val) + 1 > len ) {
626 if (len > 0) buffer[0] = 0; // return a null string
627 return false;
628 }
629 strcpy( buffer, val );
630 return true;
631 }
634 // Return true if user is running as root.
636 bool os::have_special_privileges() {
637 static bool init = false;
638 static bool privileges = false;
639 if (!init) {
640 privileges = (getuid() != geteuid()) || (getgid() != getegid());
641 init = true;
642 }
643 return privileges;
644 }
647 void os::init_system_properties_values() {
648 // The next steps are taken in the product version:
649 //
650 // Obtain the JAVA_HOME value from the location of libjvm.so.
651 // This library should be located at:
652 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
653 //
654 // If "/jre/lib/" appears at the right place in the path, then we
655 // assume libjvm.so is installed in a JDK and we use this path.
656 //
657 // Otherwise exit with message: "Could not create the Java virtual machine."
658 //
659 // The following extra steps are taken in the debugging version:
660 //
661 // If "/jre/lib/" does NOT appear at the right place in the path
662 // instead of exit check for $JAVA_HOME environment variable.
663 //
664 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
665 // then we append a fake suffix "hotspot/libjvm.so" to this path so
666 // it looks like libjvm.so is installed there
667 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
668 //
669 // Otherwise exit.
670 //
671 // Important note: if the location of libjvm.so changes this
672 // code needs to be changed accordingly.
674 // Base path of extensions installed on the system.
675 #define SYS_EXT_DIR "/usr/jdk/packages"
676 #define EXTENSIONS_DIR "/lib/ext"
677 #define ENDORSED_DIR "/lib/endorsed"
679 char cpu_arch[12];
680 // Buffer that fits several sprintfs.
681 // Note that the space for the colon and the trailing null are provided
682 // by the nulls included by the sizeof operator.
683 const size_t bufsize =
684 MAX4((size_t)MAXPATHLEN, // For dll_dir & friends.
685 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
686 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
687 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
688 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
690 // sysclasspath, java_home, dll_dir
691 {
692 char *pslash;
693 os::jvm_path(buf, bufsize);
695 // Found the full path to libjvm.so.
696 // Now cut the path to <java_home>/jre if we can.
697 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
698 pslash = strrchr(buf, '/');
699 if (pslash != NULL) {
700 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
701 }
702 Arguments::set_dll_dir(buf);
704 if (pslash != NULL) {
705 pslash = strrchr(buf, '/');
706 if (pslash != NULL) {
707 *pslash = '\0'; // Get rid of /<arch>.
708 pslash = strrchr(buf, '/');
709 if (pslash != NULL) {
710 *pslash = '\0'; // Get rid of /lib.
711 }
712 }
713 }
714 Arguments::set_java_home(buf);
715 set_boot_path('/', ':');
716 }
718 // Where to look for native libraries.
719 {
720 // Use dlinfo() to determine the correct java.library.path.
721 //
722 // If we're launched by the Java launcher, and the user
723 // does not set java.library.path explicitly on the commandline,
724 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
725 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
726 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
727 // /usr/lib), which is exactly what we want.
728 //
729 // If the user does set java.library.path, it completely
730 // overwrites this setting, and always has.
731 //
732 // If we're not launched by the Java launcher, we may
733 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
734 // settings. Again, dlinfo does exactly what we want.
736 Dl_serinfo info_sz, *info = &info_sz;
737 Dl_serpath *path;
738 char *library_path;
739 char *common_path = buf;
741 // Determine search path count and required buffer size.
742 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
743 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
744 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
745 }
747 // Allocate new buffer and initialize.
748 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
749 info->dls_size = info_sz.dls_size;
750 info->dls_cnt = info_sz.dls_cnt;
752 // Obtain search path information.
753 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
754 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
755 FREE_C_HEAP_ARRAY(char, info, mtInternal);
756 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
757 }
759 path = &info->dls_serpath[0];
761 // Note: Due to a legacy implementation, most of the library path
762 // is set in the launcher. This was to accomodate linking restrictions
763 // on legacy Solaris implementations (which are no longer supported).
764 // Eventually, all the library path setting will be done here.
765 //
766 // However, to prevent the proliferation of improperly built native
767 // libraries, the new path component /usr/jdk/packages is added here.
769 // Determine the actual CPU architecture.
770 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
771 #ifdef _LP64
772 // If we are a 64-bit vm, perform the following translations:
773 // sparc -> sparcv9
774 // i386 -> amd64
775 if (strcmp(cpu_arch, "sparc") == 0) {
776 strcat(cpu_arch, "v9");
777 } else if (strcmp(cpu_arch, "i386") == 0) {
778 strcpy(cpu_arch, "amd64");
779 }
780 #endif
782 // Construct the invariant part of ld_library_path.
783 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
785 // Struct size is more than sufficient for the path components obtained
786 // through the dlinfo() call, so only add additional space for the path
787 // components explicitly added here.
788 size_t library_path_size = info->dls_size + strlen(common_path);
789 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
790 library_path[0] = '\0';
792 // Construct the desired Java library path from the linker's library
793 // search path.
794 //
795 // For compatibility, it is optimal that we insert the additional path
796 // components specific to the Java VM after those components specified
797 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
798 // infrastructure.
799 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
800 strcpy(library_path, common_path);
801 } else {
802 int inserted = 0;
803 int i;
804 for (i = 0; i < info->dls_cnt; i++, path++) {
805 uint_t flags = path->dls_flags & LA_SER_MASK;
806 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
807 strcat(library_path, common_path);
808 strcat(library_path, os::path_separator());
809 inserted = 1;
810 }
811 strcat(library_path, path->dls_name);
812 strcat(library_path, os::path_separator());
813 }
814 // Eliminate trailing path separator.
815 library_path[strlen(library_path)-1] = '\0';
816 }
818 // happens before argument parsing - can't use a trace flag
819 // tty->print_raw("init_system_properties_values: native lib path: ");
820 // tty->print_raw_cr(library_path);
822 // Callee copies into its own buffer.
823 Arguments::set_library_path(library_path);
825 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
826 FREE_C_HEAP_ARRAY(char, info, mtInternal);
827 }
829 // Extensions directories.
830 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
831 Arguments::set_ext_dirs(buf);
833 // Endorsed standards default directory.
834 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
835 Arguments::set_endorsed_dirs(buf);
837 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
839 #undef SYS_EXT_DIR
840 #undef EXTENSIONS_DIR
841 #undef ENDORSED_DIR
842 }
844 void os::breakpoint() {
845 BREAKPOINT;
846 }
848 bool os::obsolete_option(const JavaVMOption *option)
849 {
850 if (!strncmp(option->optionString, "-Xt", 3)) {
851 return true;
852 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
853 return true;
854 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
855 return true;
856 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
857 return true;
858 }
859 return false;
860 }
862 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
863 address stackStart = (address)thread->stack_base();
864 address stackEnd = (address)(stackStart - (address)thread->stack_size());
865 if (sp < stackStart && sp >= stackEnd ) return true;
866 return false;
867 }
869 extern "C" void breakpoint() {
870 // use debugger to set breakpoint here
871 }
873 static thread_t main_thread;
875 // Thread start routine for all new Java threads
876 extern "C" void* java_start(void* thread_addr) {
877 // Try to randomize the cache line index of hot stack frames.
878 // This helps when threads of the same stack traces evict each other's
879 // cache lines. The threads can be either from the same JVM instance, or
880 // from different JVM instances. The benefit is especially true for
881 // processors with hyperthreading technology.
882 static int counter = 0;
883 int pid = os::current_process_id();
884 alloca(((pid ^ counter++) & 7) * 128);
886 int prio;
887 Thread* thread = (Thread*)thread_addr;
888 OSThread* osthr = thread->osthread();
890 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
891 thread->_schedctl = (void *) schedctl_init () ;
893 if (UseNUMA) {
894 int lgrp_id = os::numa_get_group_id();
895 if (lgrp_id != -1) {
896 thread->set_lgrp_id(lgrp_id);
897 }
898 }
900 // If the creator called set priority before we started,
901 // we need to call set_native_priority now that we have an lwp.
902 // We used to get the priority from thr_getprio (we called
903 // thr_setprio way back in create_thread) and pass it to
904 // set_native_priority, but Solaris scales the priority
905 // in java_to_os_priority, so when we read it back here,
906 // we pass trash to set_native_priority instead of what's
907 // in java_to_os_priority. So we save the native priority
908 // in the osThread and recall it here.
910 if ( osthr->thread_id() != -1 ) {
911 if ( UseThreadPriorities ) {
912 int prio = osthr->native_priority();
913 if (ThreadPriorityVerbose) {
914 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
915 INTPTR_FORMAT ", setting priority: %d\n",
916 osthr->thread_id(), osthr->lwp_id(), prio);
917 }
918 os::set_native_priority(thread, prio);
919 }
920 } else if (ThreadPriorityVerbose) {
921 warning("Can't set priority in _start routine, thread id hasn't been set\n");
922 }
924 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
926 // initialize signal mask for this thread
927 os::Solaris::hotspot_sigmask(thread);
929 thread->run();
931 // One less thread is executing
932 // When the VMThread gets here, the main thread may have already exited
933 // which frees the CodeHeap containing the Atomic::dec code
934 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
935 Atomic::dec(&os::Solaris::_os_thread_count);
936 }
938 if (UseDetachedThreads) {
939 thr_exit(NULL);
940 ShouldNotReachHere();
941 }
942 return NULL;
943 }
945 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
946 // Allocate the OSThread object
947 OSThread* osthread = new OSThread(NULL, NULL);
948 if (osthread == NULL) return NULL;
950 // Store info on the Solaris thread into the OSThread
951 osthread->set_thread_id(thread_id);
952 osthread->set_lwp_id(_lwp_self());
953 thread->_schedctl = (void *) schedctl_init () ;
955 if (UseNUMA) {
956 int lgrp_id = os::numa_get_group_id();
957 if (lgrp_id != -1) {
958 thread->set_lgrp_id(lgrp_id);
959 }
960 }
962 if ( ThreadPriorityVerbose ) {
963 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
964 osthread->thread_id(), osthread->lwp_id() );
965 }
967 // Initial thread state is INITIALIZED, not SUSPENDED
968 osthread->set_state(INITIALIZED);
970 return osthread;
971 }
973 void os::Solaris::hotspot_sigmask(Thread* thread) {
975 //Save caller's signal mask
976 sigset_t sigmask;
977 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
978 OSThread *osthread = thread->osthread();
979 osthread->set_caller_sigmask(sigmask);
981 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
982 if (!ReduceSignalUsage) {
983 if (thread->is_VM_thread()) {
984 // Only the VM thread handles BREAK_SIGNAL ...
985 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
986 } else {
987 // ... all other threads block BREAK_SIGNAL
988 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
989 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
990 }
991 }
992 }
994 bool os::create_attached_thread(JavaThread* thread) {
995 #ifdef ASSERT
996 thread->verify_not_published();
997 #endif
998 OSThread* osthread = create_os_thread(thread, thr_self());
999 if (osthread == NULL) {
1000 return false;
1001 }
1003 // Initial thread state is RUNNABLE
1004 osthread->set_state(RUNNABLE);
1005 thread->set_osthread(osthread);
1007 // initialize signal mask for this thread
1008 // and save the caller's signal mask
1009 os::Solaris::hotspot_sigmask(thread);
1011 return true;
1012 }
1014 bool os::create_main_thread(JavaThread* thread) {
1015 #ifdef ASSERT
1016 thread->verify_not_published();
1017 #endif
1018 if (_starting_thread == NULL) {
1019 _starting_thread = create_os_thread(thread, main_thread);
1020 if (_starting_thread == NULL) {
1021 return false;
1022 }
1023 }
1025 // The primodial thread is runnable from the start
1026 _starting_thread->set_state(RUNNABLE);
1028 thread->set_osthread(_starting_thread);
1030 // initialize signal mask for this thread
1031 // and save the caller's signal mask
1032 os::Solaris::hotspot_sigmask(thread);
1034 return true;
1035 }
1037 // _T2_libthread is true if we believe we are running with the newer
1038 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1039 bool os::Solaris::_T2_libthread = false;
1041 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1042 // Allocate the OSThread object
1043 OSThread* osthread = new OSThread(NULL, NULL);
1044 if (osthread == NULL) {
1045 return false;
1046 }
1048 if ( ThreadPriorityVerbose ) {
1049 char *thrtyp;
1050 switch ( thr_type ) {
1051 case vm_thread:
1052 thrtyp = (char *)"vm";
1053 break;
1054 case cgc_thread:
1055 thrtyp = (char *)"cgc";
1056 break;
1057 case pgc_thread:
1058 thrtyp = (char *)"pgc";
1059 break;
1060 case java_thread:
1061 thrtyp = (char *)"java";
1062 break;
1063 case compiler_thread:
1064 thrtyp = (char *)"compiler";
1065 break;
1066 case watcher_thread:
1067 thrtyp = (char *)"watcher";
1068 break;
1069 default:
1070 thrtyp = (char *)"unknown";
1071 break;
1072 }
1073 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1074 }
1076 // Calculate stack size if it's not specified by caller.
1077 if (stack_size == 0) {
1078 // The default stack size 1M (2M for LP64).
1079 stack_size = (BytesPerWord >> 2) * K * K;
1081 switch (thr_type) {
1082 case os::java_thread:
1083 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1084 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1085 break;
1086 case os::compiler_thread:
1087 if (CompilerThreadStackSize > 0) {
1088 stack_size = (size_t)(CompilerThreadStackSize * K);
1089 break;
1090 } // else fall through:
1091 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1092 case os::vm_thread:
1093 case os::pgc_thread:
1094 case os::cgc_thread:
1095 case os::watcher_thread:
1096 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1097 break;
1098 }
1099 }
1100 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1102 // Initial state is ALLOCATED but not INITIALIZED
1103 osthread->set_state(ALLOCATED);
1105 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1106 // We got lots of threads. Check if we still have some address space left.
1107 // Need to be at least 5Mb of unreserved address space. We do check by
1108 // trying to reserve some.
1109 const size_t VirtualMemoryBangSize = 20*K*K;
1110 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1111 if (mem == NULL) {
1112 delete osthread;
1113 return false;
1114 } else {
1115 // Release the memory again
1116 os::release_memory(mem, VirtualMemoryBangSize);
1117 }
1118 }
1120 // Setup osthread because the child thread may need it.
1121 thread->set_osthread(osthread);
1123 // Create the Solaris thread
1124 // explicit THR_BOUND for T2_libthread case in case
1125 // that assumption is not accurate, but our alternate signal stack
1126 // handling is based on it which must have bound threads
1127 thread_t tid = 0;
1128 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1129 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1130 (thr_type == vm_thread) ||
1131 (thr_type == cgc_thread) ||
1132 (thr_type == pgc_thread) ||
1133 (thr_type == compiler_thread && BackgroundCompilation)) ?
1134 THR_BOUND : 0);
1135 int status;
1137 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1138 //
1139 // On multiprocessors systems, libthread sometimes under-provisions our
1140 // process with LWPs. On a 30-way systems, for instance, we could have
1141 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1142 // to our process. This can result in under utilization of PEs.
1143 // I suspect the problem is related to libthread's LWP
1144 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1145 // upcall policy.
1146 //
1147 // The following code is palliative -- it attempts to ensure that our
1148 // process has sufficient LWPs to take advantage of multiple PEs.
1149 // Proper long-term cures include using user-level threads bound to LWPs
1150 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1151 // slight timing window with respect to sampling _os_thread_count, but
1152 // the race is benign. Also, we should periodically recompute
1153 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1154 // the number of PEs in our partition. You might be tempted to use
1155 // THR_NEW_LWP here, but I'd recommend against it as that could
1156 // result in undesirable growth of the libthread's LWP pool.
1157 // The fix below isn't sufficient; for instance, it doesn't take into count
1158 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1159 //
1160 // Some pathologies this scheme doesn't handle:
1161 // * Threads can block, releasing the LWPs. The LWPs can age out.
1162 // When a large number of threads become ready again there aren't
1163 // enough LWPs available to service them. This can occur when the
1164 // number of ready threads oscillates.
1165 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1166 //
1167 // Finally, we should call thr_setconcurrency() periodically to refresh
1168 // the LWP pool and thwart the LWP age-out mechanism.
1169 // The "+3" term provides a little slop -- we want to slightly overprovision.
1171 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1172 if (!(flags & THR_BOUND)) {
1173 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1174 }
1175 }
1176 // Although this doesn't hurt, we should warn of undefined behavior
1177 // when using unbound T1 threads with schedctl(). This should never
1178 // happen, as the compiler and VM threads are always created bound
1179 DEBUG_ONLY(
1180 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1181 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1182 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1183 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1184 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1185 }
1186 );
1189 // Mark that we don't have an lwp or thread id yet.
1190 // In case we attempt to set the priority before the thread starts.
1191 osthread->set_lwp_id(-1);
1192 osthread->set_thread_id(-1);
1194 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1195 if (status != 0) {
1196 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1197 perror("os::create_thread");
1198 }
1199 thread->set_osthread(NULL);
1200 // Need to clean up stuff we've allocated so far
1201 delete osthread;
1202 return false;
1203 }
1205 Atomic::inc(&os::Solaris::_os_thread_count);
1207 // Store info on the Solaris thread into the OSThread
1208 osthread->set_thread_id(tid);
1210 // Remember that we created this thread so we can set priority on it
1211 osthread->set_vm_created();
1213 // Set the default thread priority. If using bound threads, setting
1214 // lwp priority will be delayed until thread start.
1215 set_native_priority(thread,
1216 DefaultThreadPriority == -1 ?
1217 java_to_os_priority[NormPriority] :
1218 DefaultThreadPriority);
1220 // Initial thread state is INITIALIZED, not SUSPENDED
1221 osthread->set_state(INITIALIZED);
1223 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1224 return true;
1225 }
1227 /* defined for >= Solaris 10. This allows builds on earlier versions
1228 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1229 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1230 * and -XX:+UseAltSigs does nothing since these should have no conflict
1231 */
1232 #if !defined(SIGJVM1)
1233 #define SIGJVM1 39
1234 #define SIGJVM2 40
1235 #endif
1237 debug_only(static bool signal_sets_initialized = false);
1238 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1239 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1240 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1242 bool os::Solaris::is_sig_ignored(int sig) {
1243 struct sigaction oact;
1244 sigaction(sig, (struct sigaction*)NULL, &oact);
1245 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1246 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1247 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1248 return true;
1249 else
1250 return false;
1251 }
1253 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1254 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1255 static bool isJVM1available() {
1256 return SIGJVM1 < SIGRTMIN;
1257 }
1259 void os::Solaris::signal_sets_init() {
1260 // Should also have an assertion stating we are still single-threaded.
1261 assert(!signal_sets_initialized, "Already initialized");
1262 // Fill in signals that are necessarily unblocked for all threads in
1263 // the VM. Currently, we unblock the following signals:
1264 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1265 // by -Xrs (=ReduceSignalUsage));
1266 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1267 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1268 // the dispositions or masks wrt these signals.
1269 // Programs embedding the VM that want to use the above signals for their
1270 // own purposes must, at this time, use the "-Xrs" option to prevent
1271 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1272 // (See bug 4345157, and other related bugs).
1273 // In reality, though, unblocking these signals is really a nop, since
1274 // these signals are not blocked by default.
1275 sigemptyset(&unblocked_sigs);
1276 sigemptyset(&allowdebug_blocked_sigs);
1277 sigaddset(&unblocked_sigs, SIGILL);
1278 sigaddset(&unblocked_sigs, SIGSEGV);
1279 sigaddset(&unblocked_sigs, SIGBUS);
1280 sigaddset(&unblocked_sigs, SIGFPE);
1282 if (isJVM1available) {
1283 os::Solaris::set_SIGinterrupt(SIGJVM1);
1284 os::Solaris::set_SIGasync(SIGJVM2);
1285 } else if (UseAltSigs) {
1286 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1287 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1288 } else {
1289 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1290 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1291 }
1293 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1294 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1296 if (!ReduceSignalUsage) {
1297 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1298 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1299 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1300 }
1301 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1302 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1303 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1304 }
1305 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1306 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1307 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1308 }
1309 }
1310 // Fill in signals that are blocked by all but the VM thread.
1311 sigemptyset(&vm_sigs);
1312 if (!ReduceSignalUsage)
1313 sigaddset(&vm_sigs, BREAK_SIGNAL);
1314 debug_only(signal_sets_initialized = true);
1316 // For diagnostics only used in run_periodic_checks
1317 sigemptyset(&check_signal_done);
1318 }
1320 // These are signals that are unblocked while a thread is running Java.
1321 // (For some reason, they get blocked by default.)
1322 sigset_t* os::Solaris::unblocked_signals() {
1323 assert(signal_sets_initialized, "Not initialized");
1324 return &unblocked_sigs;
1325 }
1327 // These are the signals that are blocked while a (non-VM) thread is
1328 // running Java. Only the VM thread handles these signals.
1329 sigset_t* os::Solaris::vm_signals() {
1330 assert(signal_sets_initialized, "Not initialized");
1331 return &vm_sigs;
1332 }
1334 // These are signals that are blocked during cond_wait to allow debugger in
1335 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1336 assert(signal_sets_initialized, "Not initialized");
1337 return &allowdebug_blocked_sigs;
1338 }
1341 void _handle_uncaught_cxx_exception() {
1342 VMError err("An uncaught C++ exception");
1343 err.report_and_die();
1344 }
1347 // First crack at OS-specific initialization, from inside the new thread.
1348 void os::initialize_thread(Thread* thr) {
1349 int r = thr_main() ;
1350 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1351 if (r) {
1352 JavaThread* jt = (JavaThread *)thr;
1353 assert(jt != NULL,"Sanity check");
1354 size_t stack_size;
1355 address base = jt->stack_base();
1356 if (Arguments::created_by_java_launcher()) {
1357 // Use 2MB to allow for Solaris 7 64 bit mode.
1358 stack_size = JavaThread::stack_size_at_create() == 0
1359 ? 2048*K : JavaThread::stack_size_at_create();
1361 // There are rare cases when we may have already used more than
1362 // the basic stack size allotment before this method is invoked.
1363 // Attempt to allow for a normally sized java_stack.
1364 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1365 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1366 } else {
1367 // 6269555: If we were not created by a Java launcher, i.e. if we are
1368 // running embedded in a native application, treat the primordial thread
1369 // as much like a native attached thread as possible. This means using
1370 // the current stack size from thr_stksegment(), unless it is too large
1371 // to reliably setup guard pages. A reasonable max size is 8MB.
1372 size_t current_size = current_stack_size();
1373 // This should never happen, but just in case....
1374 if (current_size == 0) current_size = 2 * K * K;
1375 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1376 }
1377 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1378 stack_size = (size_t)(base - bottom);
1380 assert(stack_size > 0, "Stack size calculation problem");
1382 if (stack_size > jt->stack_size()) {
1383 NOT_PRODUCT(
1384 struct rlimit limits;
1385 getrlimit(RLIMIT_STACK, &limits);
1386 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1387 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1388 )
1389 tty->print_cr(
1390 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1391 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1392 "See limit(1) to increase the stack size limit.",
1393 stack_size / K, jt->stack_size() / K);
1394 vm_exit(1);
1395 }
1396 assert(jt->stack_size() >= stack_size,
1397 "Attempt to map more stack than was allocated");
1398 jt->set_stack_size(stack_size);
1399 }
1401 // 5/22/01: Right now alternate signal stacks do not handle
1402 // throwing stack overflow exceptions, see bug 4463178
1403 // Until a fix is found for this, T2 will NOT imply alternate signal
1404 // stacks.
1405 // If using T2 libthread threads, install an alternate signal stack.
1406 // Because alternate stacks associate with LWPs on Solaris,
1407 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1408 // we prefer to explicitly stack bang.
1409 // If not using T2 libthread, but using UseBoundThreads any threads
1410 // (primordial thread, jni_attachCurrentThread) we do not create,
1411 // probably are not bound, therefore they can not have an alternate
1412 // signal stack. Since our stack banging code is generated and
1413 // is shared across threads, all threads must be bound to allow
1414 // using alternate signal stacks. The alternative is to interpose
1415 // on _lwp_create to associate an alt sig stack with each LWP,
1416 // and this could be a problem when the JVM is embedded.
1417 // We would prefer to use alternate signal stacks with T2
1418 // Since there is currently no accurate way to detect T2
1419 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1420 // on installing alternate signal stacks
1423 // 05/09/03: removed alternate signal stack support for Solaris
1424 // The alternate signal stack mechanism is no longer needed to
1425 // handle stack overflow. This is now handled by allocating
1426 // guard pages (red zone) and stackbanging.
1427 // Initially the alternate signal stack mechanism was removed because
1428 // it did not work with T1 llibthread. Alternate
1429 // signal stacks MUST have all threads bound to lwps. Applications
1430 // can create their own threads and attach them without their being
1431 // bound under T1. This is frequently the case for the primordial thread.
1432 // If we were ever to reenable this mechanism we would need to
1433 // use the dynamic check for T2 libthread.
1435 os::Solaris::init_thread_fpu_state();
1436 std::set_terminate(_handle_uncaught_cxx_exception);
1437 }
1441 // Free Solaris resources related to the OSThread
1442 void os::free_thread(OSThread* osthread) {
1443 assert(osthread != NULL, "os::free_thread but osthread not set");
1446 // We are told to free resources of the argument thread,
1447 // but we can only really operate on the current thread.
1448 // The main thread must take the VMThread down synchronously
1449 // before the main thread exits and frees up CodeHeap
1450 guarantee((Thread::current()->osthread() == osthread
1451 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1452 if (Thread::current()->osthread() == osthread) {
1453 // Restore caller's signal mask
1454 sigset_t sigmask = osthread->caller_sigmask();
1455 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1456 }
1457 delete osthread;
1458 }
1460 void os::pd_start_thread(Thread* thread) {
1461 int status = thr_continue(thread->osthread()->thread_id());
1462 assert_status(status == 0, status, "thr_continue failed");
1463 }
1466 intx os::current_thread_id() {
1467 return (intx)thr_self();
1468 }
1470 static pid_t _initial_pid = 0;
1472 int os::current_process_id() {
1473 return (int)(_initial_pid ? _initial_pid : getpid());
1474 }
1476 int os::allocate_thread_local_storage() {
1477 // %%% in Win32 this allocates a memory segment pointed to by a
1478 // register. Dan Stein can implement a similar feature in
1479 // Solaris. Alternatively, the VM can do the same thing
1480 // explicitly: malloc some storage and keep the pointer in a
1481 // register (which is part of the thread's context) (or keep it
1482 // in TLS).
1483 // %%% In current versions of Solaris, thr_self and TSD can
1484 // be accessed via short sequences of displaced indirections.
1485 // The value of thr_self is available as %g7(36).
1486 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1487 // assuming that the current thread already has a value bound to k.
1488 // It may be worth experimenting with such access patterns,
1489 // and later having the parameters formally exported from a Solaris
1490 // interface. I think, however, that it will be faster to
1491 // maintain the invariant that %g2 always contains the
1492 // JavaThread in Java code, and have stubs simply
1493 // treat %g2 as a caller-save register, preserving it in a %lN.
1494 thread_key_t tk;
1495 if (thr_keycreate( &tk, NULL ) )
1496 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1497 "(%s)", strerror(errno)));
1498 return int(tk);
1499 }
1501 void os::free_thread_local_storage(int index) {
1502 // %%% don't think we need anything here
1503 // if ( pthread_key_delete((pthread_key_t) tk) )
1504 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1505 }
1507 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1508 // small number - point is NO swap space available
1509 void os::thread_local_storage_at_put(int index, void* value) {
1510 // %%% this is used only in threadLocalStorage.cpp
1511 if (thr_setspecific((thread_key_t)index, value)) {
1512 if (errno == ENOMEM) {
1513 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR,
1514 "thr_setspecific: out of swap space");
1515 } else {
1516 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1517 "(%s)", strerror(errno)));
1518 }
1519 } else {
1520 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1521 }
1522 }
1524 // This function could be called before TLS is initialized, for example, when
1525 // VM receives an async signal or when VM causes a fatal error during
1526 // initialization. Return NULL if thr_getspecific() fails.
1527 void* os::thread_local_storage_at(int index) {
1528 // %%% this is used only in threadLocalStorage.cpp
1529 void* r = NULL;
1530 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1531 }
1534 // gethrtime() should be monotonic according to the documentation,
1535 // but some virtualized platforms are known to break this guarantee.
1536 // getTimeNanos() must be guaranteed not to move backwards, so we
1537 // are forced to add a check here.
1538 inline hrtime_t getTimeNanos() {
1539 const hrtime_t now = gethrtime();
1540 const hrtime_t prev = max_hrtime;
1541 if (now <= prev) {
1542 return prev; // same or retrograde time;
1543 }
1544 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1545 assert(obsv >= prev, "invariant"); // Monotonicity
1546 // If the CAS succeeded then we're done and return "now".
1547 // If the CAS failed and the observed value "obsv" is >= now then
1548 // we should return "obsv". If the CAS failed and now > obsv > prv then
1549 // some other thread raced this thread and installed a new value, in which case
1550 // we could either (a) retry the entire operation, (b) retry trying to install now
1551 // or (c) just return obsv. We use (c). No loop is required although in some cases
1552 // we might discard a higher "now" value in deference to a slightly lower but freshly
1553 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1554 // to (a) or (b) -- and greatly reduces coherence traffic.
1555 // We might also condition (c) on the magnitude of the delta between obsv and now.
1556 // Avoiding excessive CAS operations to hot RW locations is critical.
1557 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1558 return (prev == obsv) ? now : obsv;
1559 }
1561 // Time since start-up in seconds to a fine granularity.
1562 // Used by VMSelfDestructTimer and the MemProfiler.
1563 double os::elapsedTime() {
1564 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1565 }
1567 jlong os::elapsed_counter() {
1568 return (jlong)(getTimeNanos() - first_hrtime);
1569 }
1571 jlong os::elapsed_frequency() {
1572 return hrtime_hz;
1573 }
1575 // Return the real, user, and system times in seconds from an
1576 // arbitrary fixed point in the past.
1577 bool os::getTimesSecs(double* process_real_time,
1578 double* process_user_time,
1579 double* process_system_time) {
1580 struct tms ticks;
1581 clock_t real_ticks = times(&ticks);
1583 if (real_ticks == (clock_t) (-1)) {
1584 return false;
1585 } else {
1586 double ticks_per_second = (double) clock_tics_per_sec;
1587 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1588 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1589 // For consistency return the real time from getTimeNanos()
1590 // converted to seconds.
1591 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1593 return true;
1594 }
1595 }
1597 bool os::supports_vtime() { return true; }
1599 bool os::enable_vtime() {
1600 int fd = ::open("/proc/self/ctl", O_WRONLY);
1601 if (fd == -1)
1602 return false;
1604 long cmd[] = { PCSET, PR_MSACCT };
1605 int res = ::write(fd, cmd, sizeof(long) * 2);
1606 ::close(fd);
1607 if (res != sizeof(long) * 2)
1608 return false;
1610 return true;
1611 }
1613 bool os::vtime_enabled() {
1614 int fd = ::open("/proc/self/status", O_RDONLY);
1615 if (fd == -1)
1616 return false;
1618 pstatus_t status;
1619 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1620 ::close(fd);
1621 if (res != sizeof(pstatus_t))
1622 return false;
1624 return status.pr_flags & PR_MSACCT;
1625 }
1627 double os::elapsedVTime() {
1628 return (double)gethrvtime() / (double)hrtime_hz;
1629 }
1631 // Used internally for comparisons only
1632 // getTimeMillis guaranteed to not move backwards on Solaris
1633 jlong getTimeMillis() {
1634 jlong nanotime = getTimeNanos();
1635 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1636 }
1638 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1639 jlong os::javaTimeMillis() {
1640 timeval t;
1641 if (gettimeofday( &t, NULL) == -1)
1642 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1643 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1644 }
1646 jlong os::javaTimeNanos() {
1647 return (jlong)getTimeNanos();
1648 }
1650 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1651 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1652 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1653 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1654 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1655 }
1657 char * os::local_time_string(char *buf, size_t buflen) {
1658 struct tm t;
1659 time_t long_time;
1660 time(&long_time);
1661 localtime_r(&long_time, &t);
1662 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1663 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1664 t.tm_hour, t.tm_min, t.tm_sec);
1665 return buf;
1666 }
1668 // Note: os::shutdown() might be called very early during initialization, or
1669 // called from signal handler. Before adding something to os::shutdown(), make
1670 // sure it is async-safe and can handle partially initialized VM.
1671 void os::shutdown() {
1673 // allow PerfMemory to attempt cleanup of any persistent resources
1674 perfMemory_exit();
1676 // needs to remove object in file system
1677 AttachListener::abort();
1679 // flush buffered output, finish log files
1680 ostream_abort();
1682 // Check for abort hook
1683 abort_hook_t abort_hook = Arguments::abort_hook();
1684 if (abort_hook != NULL) {
1685 abort_hook();
1686 }
1687 }
1689 // Note: os::abort() might be called very early during initialization, or
1690 // called from signal handler. Before adding something to os::abort(), make
1691 // sure it is async-safe and can handle partially initialized VM.
1692 void os::abort(bool dump_core) {
1693 os::shutdown();
1694 if (dump_core) {
1695 #ifndef PRODUCT
1696 fdStream out(defaultStream::output_fd());
1697 out.print_raw("Current thread is ");
1698 char buf[16];
1699 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1700 out.print_raw_cr(buf);
1701 out.print_raw_cr("Dumping core ...");
1702 #endif
1703 ::abort(); // dump core (for debugging)
1704 }
1706 ::exit(1);
1707 }
1709 // Die immediately, no exit hook, no abort hook, no cleanup.
1710 void os::die() {
1711 ::abort(); // dump core (for debugging)
1712 }
1714 // DLL functions
1716 const char* os::dll_file_extension() { return ".so"; }
1718 // This must be hard coded because it's the system's temporary
1719 // directory not the java application's temp directory, ala java.io.tmpdir.
1720 const char* os::get_temp_directory() { return "/tmp"; }
1722 static bool file_exists(const char* filename) {
1723 struct stat statbuf;
1724 if (filename == NULL || strlen(filename) == 0) {
1725 return false;
1726 }
1727 return os::stat(filename, &statbuf) == 0;
1728 }
1730 bool os::dll_build_name(char* buffer, size_t buflen,
1731 const char* pname, const char* fname) {
1732 bool retval = false;
1733 const size_t pnamelen = pname ? strlen(pname) : 0;
1735 // Return error on buffer overflow.
1736 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1737 return retval;
1738 }
1740 if (pnamelen == 0) {
1741 snprintf(buffer, buflen, "lib%s.so", fname);
1742 retval = true;
1743 } else if (strchr(pname, *os::path_separator()) != NULL) {
1744 int n;
1745 char** pelements = split_path(pname, &n);
1746 if (pelements == NULL) {
1747 return false;
1748 }
1749 for (int i = 0 ; i < n ; i++) {
1750 // really shouldn't be NULL but what the heck, check can't hurt
1751 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1752 continue; // skip the empty path values
1753 }
1754 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1755 if (file_exists(buffer)) {
1756 retval = true;
1757 break;
1758 }
1759 }
1760 // release the storage
1761 for (int i = 0 ; i < n ; i++) {
1762 if (pelements[i] != NULL) {
1763 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1764 }
1765 }
1766 if (pelements != NULL) {
1767 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1768 }
1769 } else {
1770 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1771 retval = true;
1772 }
1773 return retval;
1774 }
1776 // check if addr is inside libjvm.so
1777 bool os::address_is_in_vm(address addr) {
1778 static address libjvm_base_addr;
1779 Dl_info dlinfo;
1781 if (libjvm_base_addr == NULL) {
1782 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1783 libjvm_base_addr = (address)dlinfo.dli_fbase;
1784 }
1785 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1786 }
1788 if (dladdr((void *)addr, &dlinfo) != 0) {
1789 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1790 }
1792 return false;
1793 }
1795 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1796 static dladdr1_func_type dladdr1_func = NULL;
1798 bool os::dll_address_to_function_name(address addr, char *buf,
1799 int buflen, int * offset) {
1800 // buf is not optional, but offset is optional
1801 assert(buf != NULL, "sanity check");
1803 Dl_info dlinfo;
1805 // dladdr1_func was initialized in os::init()
1806 if (dladdr1_func != NULL) {
1807 // yes, we have dladdr1
1809 // Support for dladdr1 is checked at runtime; it may be
1810 // available even if the vm is built on a machine that does
1811 // not have dladdr1 support. Make sure there is a value for
1812 // RTLD_DL_SYMENT.
1813 #ifndef RTLD_DL_SYMENT
1814 #define RTLD_DL_SYMENT 1
1815 #endif
1816 #ifdef _LP64
1817 Elf64_Sym * info;
1818 #else
1819 Elf32_Sym * info;
1820 #endif
1821 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1822 RTLD_DL_SYMENT) != 0) {
1823 // see if we have a matching symbol that covers our address
1824 if (dlinfo.dli_saddr != NULL &&
1825 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1826 if (dlinfo.dli_sname != NULL) {
1827 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1828 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1829 }
1830 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1831 return true;
1832 }
1833 }
1834 // no matching symbol so try for just file info
1835 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1836 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1837 buf, buflen, offset, dlinfo.dli_fname)) {
1838 return true;
1839 }
1840 }
1841 }
1842 buf[0] = '\0';
1843 if (offset != NULL) *offset = -1;
1844 return false;
1845 }
1847 // no, only dladdr is available
1848 if (dladdr((void *)addr, &dlinfo) != 0) {
1849 // see if we have a matching symbol
1850 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1851 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1852 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1853 }
1854 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1855 return true;
1856 }
1857 // no matching symbol so try for just file info
1858 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1859 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1860 buf, buflen, offset, dlinfo.dli_fname)) {
1861 return true;
1862 }
1863 }
1864 }
1865 buf[0] = '\0';
1866 if (offset != NULL) *offset = -1;
1867 return false;
1868 }
1870 bool os::dll_address_to_library_name(address addr, char* buf,
1871 int buflen, int* offset) {
1872 // buf is not optional, but offset is optional
1873 assert(buf != NULL, "sanity check");
1875 Dl_info dlinfo;
1877 if (dladdr((void*)addr, &dlinfo) != 0) {
1878 if (dlinfo.dli_fname != NULL) {
1879 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1880 }
1881 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1882 *offset = addr - (address)dlinfo.dli_fbase;
1883 }
1884 return true;
1885 }
1887 buf[0] = '\0';
1888 if (offset) *offset = -1;
1889 return false;
1890 }
1892 // Prints the names and full paths of all opened dynamic libraries
1893 // for current process
1894 void os::print_dll_info(outputStream * st) {
1895 Dl_info dli;
1896 void *handle;
1897 Link_map *map;
1898 Link_map *p;
1900 st->print_cr("Dynamic libraries:"); st->flush();
1902 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1903 dli.dli_fname == NULL) {
1904 st->print_cr("Error: Cannot print dynamic libraries.");
1905 return;
1906 }
1907 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1908 if (handle == NULL) {
1909 st->print_cr("Error: Cannot print dynamic libraries.");
1910 return;
1911 }
1912 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1913 if (map == NULL) {
1914 st->print_cr("Error: Cannot print dynamic libraries.");
1915 return;
1916 }
1918 while (map->l_prev != NULL)
1919 map = map->l_prev;
1921 while (map != NULL) {
1922 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1923 map = map->l_next;
1924 }
1926 dlclose(handle);
1927 }
1929 // Loads .dll/.so and
1930 // in case of error it checks if .dll/.so was built for the
1931 // same architecture as Hotspot is running on
1933 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1934 {
1935 void * result= ::dlopen(filename, RTLD_LAZY);
1936 if (result != NULL) {
1937 // Successful loading
1938 return result;
1939 }
1941 Elf32_Ehdr elf_head;
1943 // Read system error message into ebuf
1944 // It may or may not be overwritten below
1945 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1946 ebuf[ebuflen-1]='\0';
1947 int diag_msg_max_length=ebuflen-strlen(ebuf);
1948 char* diag_msg_buf=ebuf+strlen(ebuf);
1950 if (diag_msg_max_length==0) {
1951 // No more space in ebuf for additional diagnostics message
1952 return NULL;
1953 }
1956 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1958 if (file_descriptor < 0) {
1959 // Can't open library, report dlerror() message
1960 return NULL;
1961 }
1963 bool failed_to_read_elf_head=
1964 (sizeof(elf_head)!=
1965 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1967 ::close(file_descriptor);
1968 if (failed_to_read_elf_head) {
1969 // file i/o error - report dlerror() msg
1970 return NULL;
1971 }
1973 typedef struct {
1974 Elf32_Half code; // Actual value as defined in elf.h
1975 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1976 char elf_class; // 32 or 64 bit
1977 char endianess; // MSB or LSB
1978 char* name; // String representation
1979 } arch_t;
1981 static const arch_t arch_array[]={
1982 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1983 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1984 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1985 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1986 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1987 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1988 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1989 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1990 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1991 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1992 };
1994 #if (defined IA32)
1995 static Elf32_Half running_arch_code=EM_386;
1996 #elif (defined AMD64)
1997 static Elf32_Half running_arch_code=EM_X86_64;
1998 #elif (defined IA64)
1999 static Elf32_Half running_arch_code=EM_IA_64;
2000 #elif (defined __sparc) && (defined _LP64)
2001 static Elf32_Half running_arch_code=EM_SPARCV9;
2002 #elif (defined __sparc) && (!defined _LP64)
2003 static Elf32_Half running_arch_code=EM_SPARC;
2004 #elif (defined __powerpc64__)
2005 static Elf32_Half running_arch_code=EM_PPC64;
2006 #elif (defined __powerpc__)
2007 static Elf32_Half running_arch_code=EM_PPC;
2008 #elif (defined ARM)
2009 static Elf32_Half running_arch_code=EM_ARM;
2010 #else
2011 #error Method os::dll_load requires that one of following is defined:\
2012 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2013 #endif
2015 // Identify compatability class for VM's architecture and library's architecture
2016 // Obtain string descriptions for architectures
2018 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2019 int running_arch_index=-1;
2021 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2022 if (running_arch_code == arch_array[i].code) {
2023 running_arch_index = i;
2024 }
2025 if (lib_arch.code == arch_array[i].code) {
2026 lib_arch.compat_class = arch_array[i].compat_class;
2027 lib_arch.name = arch_array[i].name;
2028 }
2029 }
2031 assert(running_arch_index != -1,
2032 "Didn't find running architecture code (running_arch_code) in arch_array");
2033 if (running_arch_index == -1) {
2034 // Even though running architecture detection failed
2035 // we may still continue with reporting dlerror() message
2036 return NULL;
2037 }
2039 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2040 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2041 return NULL;
2042 }
2044 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2045 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2046 return NULL;
2047 }
2049 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2050 if ( lib_arch.name!=NULL ) {
2051 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2052 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2053 lib_arch.name, arch_array[running_arch_index].name);
2054 } else {
2055 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2056 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2057 lib_arch.code,
2058 arch_array[running_arch_index].name);
2059 }
2060 }
2062 return NULL;
2063 }
2065 void* os::dll_lookup(void* handle, const char* name) {
2066 return dlsym(handle, name);
2067 }
2069 void* os::get_default_process_handle() {
2070 return (void*)::dlopen(NULL, RTLD_LAZY);
2071 }
2073 int os::stat(const char *path, struct stat *sbuf) {
2074 char pathbuf[MAX_PATH];
2075 if (strlen(path) > MAX_PATH - 1) {
2076 errno = ENAMETOOLONG;
2077 return -1;
2078 }
2079 os::native_path(strcpy(pathbuf, path));
2080 return ::stat(pathbuf, sbuf);
2081 }
2083 static bool _print_ascii_file(const char* filename, outputStream* st) {
2084 int fd = ::open(filename, O_RDONLY);
2085 if (fd == -1) {
2086 return false;
2087 }
2089 char buf[32];
2090 int bytes;
2091 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2092 st->print_raw(buf, bytes);
2093 }
2095 ::close(fd);
2097 return true;
2098 }
2100 void os::print_os_info_brief(outputStream* st) {
2101 os::Solaris::print_distro_info(st);
2103 os::Posix::print_uname_info(st);
2105 os::Solaris::print_libversion_info(st);
2106 }
2108 void os::print_os_info(outputStream* st) {
2109 st->print("OS:");
2111 os::Solaris::print_distro_info(st);
2113 os::Posix::print_uname_info(st);
2115 os::Solaris::print_libversion_info(st);
2117 os::Posix::print_rlimit_info(st);
2119 os::Posix::print_load_average(st);
2120 }
2122 void os::Solaris::print_distro_info(outputStream* st) {
2123 if (!_print_ascii_file("/etc/release", st)) {
2124 st->print("Solaris");
2125 }
2126 st->cr();
2127 }
2129 void os::Solaris::print_libversion_info(outputStream* st) {
2130 if (os::Solaris::T2_libthread()) {
2131 st->print(" (T2 libthread)");
2132 }
2133 else {
2134 st->print(" (T1 libthread)");
2135 }
2136 st->cr();
2137 }
2139 static bool check_addr0(outputStream* st) {
2140 jboolean status = false;
2141 int fd = ::open("/proc/self/map",O_RDONLY);
2142 if (fd >= 0) {
2143 prmap_t p;
2144 while(::read(fd, &p, sizeof(p)) > 0) {
2145 if (p.pr_vaddr == 0x0) {
2146 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2147 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2148 st->print("Access:");
2149 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2150 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2151 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2152 st->cr();
2153 status = true;
2154 }
2155 }
2156 ::close(fd);
2157 }
2158 return status;
2159 }
2161 void os::pd_print_cpu_info(outputStream* st) {
2162 // Nothing to do for now.
2163 }
2165 void os::print_memory_info(outputStream* st) {
2166 st->print("Memory:");
2167 st->print(" %dk page", os::vm_page_size()>>10);
2168 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2169 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2170 st->cr();
2171 (void) check_addr0(st);
2172 }
2174 void os::print_siginfo(outputStream* st, void* siginfo) {
2175 const siginfo_t* si = (const siginfo_t*)siginfo;
2177 os::Posix::print_siginfo_brief(st, si);
2179 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2180 UseSharedSpaces) {
2181 FileMapInfo* mapinfo = FileMapInfo::current_info();
2182 if (mapinfo->is_in_shared_space(si->si_addr)) {
2183 st->print("\n\nError accessing class data sharing archive." \
2184 " Mapped file inaccessible during execution, " \
2185 " possible disk/network problem.");
2186 }
2187 }
2188 st->cr();
2189 }
2191 // Moved from whole group, because we need them here for diagnostic
2192 // prints.
2193 #define OLDMAXSIGNUM 32
2194 static int Maxsignum = 0;
2195 static int *ourSigFlags = NULL;
2197 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2199 int os::Solaris::get_our_sigflags(int sig) {
2200 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2201 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2202 return ourSigFlags[sig];
2203 }
2205 void os::Solaris::set_our_sigflags(int sig, int flags) {
2206 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2207 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2208 ourSigFlags[sig] = flags;
2209 }
2212 static const char* get_signal_handler_name(address handler,
2213 char* buf, int buflen) {
2214 int offset;
2215 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2216 if (found) {
2217 // skip directory names
2218 const char *p1, *p2;
2219 p1 = buf;
2220 size_t len = strlen(os::file_separator());
2221 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2222 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2223 } else {
2224 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2225 }
2226 return buf;
2227 }
2229 static void print_signal_handler(outputStream* st, int sig,
2230 char* buf, size_t buflen) {
2231 struct sigaction sa;
2233 sigaction(sig, NULL, &sa);
2235 st->print("%s: ", os::exception_name(sig, buf, buflen));
2237 address handler = (sa.sa_flags & SA_SIGINFO)
2238 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2239 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2241 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2242 st->print("SIG_DFL");
2243 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2244 st->print("SIG_IGN");
2245 } else {
2246 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2247 }
2249 st->print(", sa_mask[0]=");
2250 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2252 address rh = VMError::get_resetted_sighandler(sig);
2253 // May be, handler was resetted by VMError?
2254 if(rh != NULL) {
2255 handler = rh;
2256 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2257 }
2259 st->print(", sa_flags=");
2260 os::Posix::print_sa_flags(st, sa.sa_flags);
2262 // Check: is it our handler?
2263 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2264 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2265 // It is our signal handler
2266 // check for flags
2267 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2268 st->print(
2269 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2270 os::Solaris::get_our_sigflags(sig));
2271 }
2272 }
2273 st->cr();
2274 }
2276 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2277 st->print_cr("Signal Handlers:");
2278 print_signal_handler(st, SIGSEGV, buf, buflen);
2279 print_signal_handler(st, SIGBUS , buf, buflen);
2280 print_signal_handler(st, SIGFPE , buf, buflen);
2281 print_signal_handler(st, SIGPIPE, buf, buflen);
2282 print_signal_handler(st, SIGXFSZ, buf, buflen);
2283 print_signal_handler(st, SIGILL , buf, buflen);
2284 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2285 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2286 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2287 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2288 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2289 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2290 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2291 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2292 }
2294 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2296 // Find the full path to the current module, libjvm.so
2297 void os::jvm_path(char *buf, jint buflen) {
2298 // Error checking.
2299 if (buflen < MAXPATHLEN) {
2300 assert(false, "must use a large-enough buffer");
2301 buf[0] = '\0';
2302 return;
2303 }
2304 // Lazy resolve the path to current module.
2305 if (saved_jvm_path[0] != 0) {
2306 strcpy(buf, saved_jvm_path);
2307 return;
2308 }
2310 Dl_info dlinfo;
2311 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2312 assert(ret != 0, "cannot locate libjvm");
2313 if (ret != 0 && dlinfo.dli_fname != NULL) {
2314 realpath((char *)dlinfo.dli_fname, buf);
2315 } else {
2316 buf[0] = '\0';
2317 return;
2318 }
2320 if (Arguments::created_by_gamma_launcher()) {
2321 // Support for the gamma launcher. Typical value for buf is
2322 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2323 // the right place in the string, then assume we are installed in a JDK and
2324 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2325 // up the path so it looks like libjvm.so is installed there (append a
2326 // fake suffix hotspot/libjvm.so).
2327 const char *p = buf + strlen(buf) - 1;
2328 for (int count = 0; p > buf && count < 5; ++count) {
2329 for (--p; p > buf && *p != '/'; --p)
2330 /* empty */ ;
2331 }
2333 if (strncmp(p, "/jre/lib/", 9) != 0) {
2334 // Look for JAVA_HOME in the environment.
2335 char* java_home_var = ::getenv("JAVA_HOME");
2336 if (java_home_var != NULL && java_home_var[0] != 0) {
2337 char cpu_arch[12];
2338 char* jrelib_p;
2339 int len;
2340 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2341 #ifdef _LP64
2342 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2343 if (strcmp(cpu_arch, "sparc") == 0) {
2344 strcat(cpu_arch, "v9");
2345 } else if (strcmp(cpu_arch, "i386") == 0) {
2346 strcpy(cpu_arch, "amd64");
2347 }
2348 #endif
2349 // Check the current module name "libjvm.so".
2350 p = strrchr(buf, '/');
2351 assert(strstr(p, "/libjvm") == p, "invalid library name");
2353 realpath(java_home_var, buf);
2354 // determine if this is a legacy image or modules image
2355 // modules image doesn't have "jre" subdirectory
2356 len = strlen(buf);
2357 assert(len < buflen, "Ran out of buffer space");
2358 jrelib_p = buf + len;
2359 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2360 if (0 != access(buf, F_OK)) {
2361 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2362 }
2364 if (0 == access(buf, F_OK)) {
2365 // Use current module name "libjvm.so"
2366 len = strlen(buf);
2367 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2368 } else {
2369 // Go back to path of .so
2370 realpath((char *)dlinfo.dli_fname, buf);
2371 }
2372 }
2373 }
2374 }
2376 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2377 }
2380 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2381 // no prefix required, not even "_"
2382 }
2385 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2386 // no suffix required
2387 }
2389 // This method is a copy of JDK's sysGetLastErrorString
2390 // from src/solaris/hpi/src/system_md.c
2392 size_t os::lasterror(char *buf, size_t len) {
2394 if (errno == 0) return 0;
2396 const char *s = ::strerror(errno);
2397 size_t n = ::strlen(s);
2398 if (n >= len) {
2399 n = len - 1;
2400 }
2401 ::strncpy(buf, s, n);
2402 buf[n] = '\0';
2403 return n;
2404 }
2407 // sun.misc.Signal
2409 extern "C" {
2410 static void UserHandler(int sig, void *siginfo, void *context) {
2411 // Ctrl-C is pressed during error reporting, likely because the error
2412 // handler fails to abort. Let VM die immediately.
2413 if (sig == SIGINT && is_error_reported()) {
2414 os::die();
2415 }
2417 os::signal_notify(sig);
2418 // We do not need to reinstate the signal handler each time...
2419 }
2420 }
2422 void* os::user_handler() {
2423 return CAST_FROM_FN_PTR(void*, UserHandler);
2424 }
2426 class Semaphore : public StackObj {
2427 public:
2428 Semaphore();
2429 ~Semaphore();
2430 void signal();
2431 void wait();
2432 bool trywait();
2433 bool timedwait(unsigned int sec, int nsec);
2434 private:
2435 sema_t _semaphore;
2436 };
2439 Semaphore::Semaphore() {
2440 sema_init(&_semaphore, 0, NULL, NULL);
2441 }
2443 Semaphore::~Semaphore() {
2444 sema_destroy(&_semaphore);
2445 }
2447 void Semaphore::signal() {
2448 sema_post(&_semaphore);
2449 }
2451 void Semaphore::wait() {
2452 sema_wait(&_semaphore);
2453 }
2455 bool Semaphore::trywait() {
2456 return sema_trywait(&_semaphore) == 0;
2457 }
2459 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2460 struct timespec ts;
2461 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2463 while (1) {
2464 int result = sema_timedwait(&_semaphore, &ts);
2465 if (result == 0) {
2466 return true;
2467 } else if (errno == EINTR) {
2468 continue;
2469 } else if (errno == ETIME) {
2470 return false;
2471 } else {
2472 return false;
2473 }
2474 }
2475 }
2477 extern "C" {
2478 typedef void (*sa_handler_t)(int);
2479 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2480 }
2482 void* os::signal(int signal_number, void* handler) {
2483 struct sigaction sigAct, oldSigAct;
2484 sigfillset(&(sigAct.sa_mask));
2485 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2486 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2488 if (sigaction(signal_number, &sigAct, &oldSigAct))
2489 // -1 means registration failed
2490 return (void *)-1;
2492 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2493 }
2495 void os::signal_raise(int signal_number) {
2496 raise(signal_number);
2497 }
2499 /*
2500 * The following code is moved from os.cpp for making this
2501 * code platform specific, which it is by its very nature.
2502 */
2504 // a counter for each possible signal value
2505 static int Sigexit = 0;
2506 static int Maxlibjsigsigs;
2507 static jint *pending_signals = NULL;
2508 static int *preinstalled_sigs = NULL;
2509 static struct sigaction *chainedsigactions = NULL;
2510 static sema_t sig_sem;
2511 typedef int (*version_getting_t)();
2512 version_getting_t os::Solaris::get_libjsig_version = NULL;
2513 static int libjsigversion = NULL;
2515 int os::sigexitnum_pd() {
2516 assert(Sigexit > 0, "signal memory not yet initialized");
2517 return Sigexit;
2518 }
2520 void os::Solaris::init_signal_mem() {
2521 // Initialize signal structures
2522 Maxsignum = SIGRTMAX;
2523 Sigexit = Maxsignum+1;
2524 assert(Maxsignum >0, "Unable to obtain max signal number");
2526 Maxlibjsigsigs = Maxsignum;
2528 // pending_signals has one int per signal
2529 // The additional signal is for SIGEXIT - exit signal to signal_thread
2530 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2531 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2533 if (UseSignalChaining) {
2534 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2535 * (Maxsignum + 1), mtInternal);
2536 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2537 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2538 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2539 }
2540 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2541 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2542 }
2544 void os::signal_init_pd() {
2545 int ret;
2547 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2548 assert(ret == 0, "sema_init() failed");
2549 }
2551 void os::signal_notify(int signal_number) {
2552 int ret;
2554 Atomic::inc(&pending_signals[signal_number]);
2555 ret = ::sema_post(&sig_sem);
2556 assert(ret == 0, "sema_post() failed");
2557 }
2559 static int check_pending_signals(bool wait_for_signal) {
2560 int ret;
2561 while (true) {
2562 for (int i = 0; i < Sigexit + 1; i++) {
2563 jint n = pending_signals[i];
2564 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2565 return i;
2566 }
2567 }
2568 if (!wait_for_signal) {
2569 return -1;
2570 }
2571 JavaThread *thread = JavaThread::current();
2572 ThreadBlockInVM tbivm(thread);
2574 bool threadIsSuspended;
2575 do {
2576 thread->set_suspend_equivalent();
2577 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2578 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2579 ;
2580 assert(ret == 0, "sema_wait() failed");
2582 // were we externally suspended while we were waiting?
2583 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2584 if (threadIsSuspended) {
2585 //
2586 // The semaphore has been incremented, but while we were waiting
2587 // another thread suspended us. We don't want to continue running
2588 // while suspended because that would surprise the thread that
2589 // suspended us.
2590 //
2591 ret = ::sema_post(&sig_sem);
2592 assert(ret == 0, "sema_post() failed");
2594 thread->java_suspend_self();
2595 }
2596 } while (threadIsSuspended);
2597 }
2598 }
2600 int os::signal_lookup() {
2601 return check_pending_signals(false);
2602 }
2604 int os::signal_wait() {
2605 return check_pending_signals(true);
2606 }
2608 ////////////////////////////////////////////////////////////////////////////////
2609 // Virtual Memory
2611 static int page_size = -1;
2613 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2614 // clear this var if support is not available.
2615 static bool has_map_align = true;
2617 int os::vm_page_size() {
2618 assert(page_size != -1, "must call os::init");
2619 return page_size;
2620 }
2622 // Solaris allocates memory by pages.
2623 int os::vm_allocation_granularity() {
2624 assert(page_size != -1, "must call os::init");
2625 return page_size;
2626 }
2628 static bool recoverable_mmap_error(int err) {
2629 // See if the error is one we can let the caller handle. This
2630 // list of errno values comes from the Solaris mmap(2) man page.
2631 switch (err) {
2632 case EBADF:
2633 case EINVAL:
2634 case ENOTSUP:
2635 // let the caller deal with these errors
2636 return true;
2638 default:
2639 // Any remaining errors on this OS can cause our reserved mapping
2640 // to be lost. That can cause confusion where different data
2641 // structures think they have the same memory mapped. The worst
2642 // scenario is if both the VM and a library think they have the
2643 // same memory mapped.
2644 return false;
2645 }
2646 }
2648 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2649 int err) {
2650 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2651 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2652 strerror(err), err);
2653 }
2655 static void warn_fail_commit_memory(char* addr, size_t bytes,
2656 size_t alignment_hint, bool exec,
2657 int err) {
2658 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2659 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2660 alignment_hint, exec, strerror(err), err);
2661 }
2663 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2664 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2665 size_t size = bytes;
2666 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2667 if (res != NULL) {
2668 if (UseNUMAInterleaving) {
2669 numa_make_global(addr, bytes);
2670 }
2671 return 0;
2672 }
2674 int err = errno; // save errno from mmap() call in mmap_chunk()
2676 if (!recoverable_mmap_error(err)) {
2677 warn_fail_commit_memory(addr, bytes, exec, err);
2678 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2679 }
2681 return err;
2682 }
2684 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2685 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2686 }
2688 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2689 const char* mesg) {
2690 assert(mesg != NULL, "mesg must be specified");
2691 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2692 if (err != 0) {
2693 // the caller wants all commit errors to exit with the specified mesg:
2694 warn_fail_commit_memory(addr, bytes, exec, err);
2695 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2696 }
2697 }
2699 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2700 size_t alignment_hint, bool exec) {
2701 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2702 if (err == 0) {
2703 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) {
2704 // If the large page size has been set and the VM
2705 // is using large pages, use the large page size
2706 // if it is smaller than the alignment hint. This is
2707 // a case where the VM wants to use a larger alignment size
2708 // for its own reasons but still want to use large pages
2709 // (which is what matters to setting the mpss range.
2710 size_t page_size = 0;
2711 if (large_page_size() < alignment_hint) {
2712 assert(UseLargePages, "Expected to be here for large page use only");
2713 page_size = large_page_size();
2714 } else {
2715 // If the alignment hint is less than the large page
2716 // size, the VM wants a particular alignment (thus the hint)
2717 // for internal reasons. Try to set the mpss range using
2718 // the alignment_hint.
2719 page_size = alignment_hint;
2720 }
2721 // Since this is a hint, ignore any failures.
2722 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2723 }
2724 }
2725 return err;
2726 }
2728 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2729 bool exec) {
2730 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2731 }
2733 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2734 size_t alignment_hint, bool exec,
2735 const char* mesg) {
2736 assert(mesg != NULL, "mesg must be specified");
2737 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2738 if (err != 0) {
2739 // the caller wants all commit errors to exit with the specified mesg:
2740 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2741 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2742 }
2743 }
2745 // Uncommit the pages in a specified region.
2746 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2747 if (madvise(addr, bytes, MADV_FREE) < 0) {
2748 debug_only(warning("MADV_FREE failed."));
2749 return;
2750 }
2751 }
2753 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2754 return os::commit_memory(addr, size, !ExecMem);
2755 }
2757 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2758 return os::uncommit_memory(addr, size);
2759 }
2761 // Change the page size in a given range.
2762 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2763 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2764 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2765 if (UseLargePages) {
2766 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2767 }
2768 }
2770 // Tell the OS to make the range local to the first-touching LWP
2771 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2772 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2773 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2774 debug_only(warning("MADV_ACCESS_LWP failed."));
2775 }
2776 }
2778 // Tell the OS that this range would be accessed from different LWPs.
2779 void os::numa_make_global(char *addr, size_t bytes) {
2780 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2781 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2782 debug_only(warning("MADV_ACCESS_MANY failed."));
2783 }
2784 }
2786 // Get the number of the locality groups.
2787 size_t os::numa_get_groups_num() {
2788 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2789 return n != -1 ? n : 1;
2790 }
2792 // Get a list of leaf locality groups. A leaf lgroup is group that
2793 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2794 // board. An LWP is assigned to one of these groups upon creation.
2795 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2796 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2797 ids[0] = 0;
2798 return 1;
2799 }
2800 int result_size = 0, top = 1, bottom = 0, cur = 0;
2801 for (int k = 0; k < size; k++) {
2802 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2803 (Solaris::lgrp_id_t*)&ids[top], size - top);
2804 if (r == -1) {
2805 ids[0] = 0;
2806 return 1;
2807 }
2808 if (!r) {
2809 // That's a leaf node.
2810 assert (bottom <= cur, "Sanity check");
2811 // Check if the node has memory
2812 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2813 NULL, 0, LGRP_RSRC_MEM) > 0) {
2814 ids[bottom++] = ids[cur];
2815 }
2816 }
2817 top += r;
2818 cur++;
2819 }
2820 if (bottom == 0) {
2821 // Handle a situation, when the OS reports no memory available.
2822 // Assume UMA architecture.
2823 ids[0] = 0;
2824 return 1;
2825 }
2826 return bottom;
2827 }
2829 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2830 bool os::numa_topology_changed() {
2831 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2832 if (is_stale != -1 && is_stale) {
2833 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2834 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2835 assert(c != 0, "Failure to initialize LGRP API");
2836 Solaris::set_lgrp_cookie(c);
2837 return true;
2838 }
2839 return false;
2840 }
2842 // Get the group id of the current LWP.
2843 int os::numa_get_group_id() {
2844 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2845 if (lgrp_id == -1) {
2846 return 0;
2847 }
2848 const int size = os::numa_get_groups_num();
2849 int *ids = (int*)alloca(size * sizeof(int));
2851 // Get the ids of all lgroups with memory; r is the count.
2852 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2853 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2854 if (r <= 0) {
2855 return 0;
2856 }
2857 return ids[os::random() % r];
2858 }
2860 // Request information about the page.
2861 bool os::get_page_info(char *start, page_info* info) {
2862 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2863 uint64_t addr = (uintptr_t)start;
2864 uint64_t outdata[2];
2865 uint_t validity = 0;
2867 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2868 return false;
2869 }
2871 info->size = 0;
2872 info->lgrp_id = -1;
2874 if ((validity & 1) != 0) {
2875 if ((validity & 2) != 0) {
2876 info->lgrp_id = outdata[0];
2877 }
2878 if ((validity & 4) != 0) {
2879 info->size = outdata[1];
2880 }
2881 return true;
2882 }
2883 return false;
2884 }
2886 // Scan the pages from start to end until a page different than
2887 // the one described in the info parameter is encountered.
2888 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2889 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2890 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2891 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2892 uint_t validity[MAX_MEMINFO_CNT];
2894 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2895 uint64_t p = (uint64_t)start;
2896 while (p < (uint64_t)end) {
2897 addrs[0] = p;
2898 size_t addrs_count = 1;
2899 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2900 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2901 addrs_count++;
2902 }
2904 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2905 return NULL;
2906 }
2908 size_t i = 0;
2909 for (; i < addrs_count; i++) {
2910 if ((validity[i] & 1) != 0) {
2911 if ((validity[i] & 4) != 0) {
2912 if (outdata[types * i + 1] != page_expected->size) {
2913 break;
2914 }
2915 } else
2916 if (page_expected->size != 0) {
2917 break;
2918 }
2920 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2921 if (outdata[types * i] != page_expected->lgrp_id) {
2922 break;
2923 }
2924 }
2925 } else {
2926 return NULL;
2927 }
2928 }
2930 if (i < addrs_count) {
2931 if ((validity[i] & 2) != 0) {
2932 page_found->lgrp_id = outdata[types * i];
2933 } else {
2934 page_found->lgrp_id = -1;
2935 }
2936 if ((validity[i] & 4) != 0) {
2937 page_found->size = outdata[types * i + 1];
2938 } else {
2939 page_found->size = 0;
2940 }
2941 return (char*)addrs[i];
2942 }
2944 p = addrs[addrs_count - 1] + page_size;
2945 }
2946 return end;
2947 }
2949 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2950 size_t size = bytes;
2951 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2952 // uncommitted page. Otherwise, the read/write might succeed if we
2953 // have enough swap space to back the physical page.
2954 return
2955 NULL != Solaris::mmap_chunk(addr, size,
2956 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2957 PROT_NONE);
2958 }
2960 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2961 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2963 if (b == MAP_FAILED) {
2964 return NULL;
2965 }
2966 return b;
2967 }
2969 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2970 char* addr = requested_addr;
2971 int flags = MAP_PRIVATE | MAP_NORESERVE;
2973 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2975 if (fixed) {
2976 flags |= MAP_FIXED;
2977 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2978 flags |= MAP_ALIGN;
2979 addr = (char*) alignment_hint;
2980 }
2982 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2983 // uncommitted page. Otherwise, the read/write might succeed if we
2984 // have enough swap space to back the physical page.
2985 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2986 }
2988 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2989 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2991 guarantee(requested_addr == NULL || requested_addr == addr,
2992 "OS failed to return requested mmap address.");
2993 return addr;
2994 }
2996 // Reserve memory at an arbitrary address, only if that area is
2997 // available (and not reserved for something else).
2999 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3000 const int max_tries = 10;
3001 char* base[max_tries];
3002 size_t size[max_tries];
3004 // Solaris adds a gap between mmap'ed regions. The size of the gap
3005 // is dependent on the requested size and the MMU. Our initial gap
3006 // value here is just a guess and will be corrected later.
3007 bool had_top_overlap = false;
3008 bool have_adjusted_gap = false;
3009 size_t gap = 0x400000;
3011 // Assert only that the size is a multiple of the page size, since
3012 // that's all that mmap requires, and since that's all we really know
3013 // about at this low abstraction level. If we need higher alignment,
3014 // we can either pass an alignment to this method or verify alignment
3015 // in one of the methods further up the call chain. See bug 5044738.
3016 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3018 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3019 // Give it a try, if the kernel honors the hint we can return immediately.
3020 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3022 volatile int err = errno;
3023 if (addr == requested_addr) {
3024 return addr;
3025 } else if (addr != NULL) {
3026 pd_unmap_memory(addr, bytes);
3027 }
3029 if (PrintMiscellaneous && Verbose) {
3030 char buf[256];
3031 buf[0] = '\0';
3032 if (addr == NULL) {
3033 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3034 }
3035 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3036 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3037 "%s", bytes, requested_addr, addr, buf);
3038 }
3040 // Address hint method didn't work. Fall back to the old method.
3041 // In theory, once SNV becomes our oldest supported platform, this
3042 // code will no longer be needed.
3043 //
3044 // Repeatedly allocate blocks until the block is allocated at the
3045 // right spot. Give up after max_tries.
3046 int i;
3047 for (i = 0; i < max_tries; ++i) {
3048 base[i] = reserve_memory(bytes);
3050 if (base[i] != NULL) {
3051 // Is this the block we wanted?
3052 if (base[i] == requested_addr) {
3053 size[i] = bytes;
3054 break;
3055 }
3057 // check that the gap value is right
3058 if (had_top_overlap && !have_adjusted_gap) {
3059 size_t actual_gap = base[i-1] - base[i] - bytes;
3060 if (gap != actual_gap) {
3061 // adjust the gap value and retry the last 2 allocations
3062 assert(i > 0, "gap adjustment code problem");
3063 have_adjusted_gap = true; // adjust the gap only once, just in case
3064 gap = actual_gap;
3065 if (PrintMiscellaneous && Verbose) {
3066 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3067 }
3068 unmap_memory(base[i], bytes);
3069 unmap_memory(base[i-1], size[i-1]);
3070 i-=2;
3071 continue;
3072 }
3073 }
3075 // Does this overlap the block we wanted? Give back the overlapped
3076 // parts and try again.
3077 //
3078 // There is still a bug in this code: if top_overlap == bytes,
3079 // the overlap is offset from requested region by the value of gap.
3080 // In this case giving back the overlapped part will not work,
3081 // because we'll give back the entire block at base[i] and
3082 // therefore the subsequent allocation will not generate a new gap.
3083 // This could be fixed with a new algorithm that used larger
3084 // or variable size chunks to find the requested region -
3085 // but such a change would introduce additional complications.
3086 // It's rare enough that the planets align for this bug,
3087 // so we'll just wait for a fix for 6204603/5003415 which
3088 // will provide a mmap flag to allow us to avoid this business.
3090 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3091 if (top_overlap >= 0 && top_overlap < bytes) {
3092 had_top_overlap = true;
3093 unmap_memory(base[i], top_overlap);
3094 base[i] += top_overlap;
3095 size[i] = bytes - top_overlap;
3096 } else {
3097 size_t bottom_overlap = base[i] + bytes - requested_addr;
3098 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3099 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3100 warning("attempt_reserve_memory_at: possible alignment bug");
3101 }
3102 unmap_memory(requested_addr, bottom_overlap);
3103 size[i] = bytes - bottom_overlap;
3104 } else {
3105 size[i] = bytes;
3106 }
3107 }
3108 }
3109 }
3111 // Give back the unused reserved pieces.
3113 for (int j = 0; j < i; ++j) {
3114 if (base[j] != NULL) {
3115 unmap_memory(base[j], size[j]);
3116 }
3117 }
3119 return (i < max_tries) ? requested_addr : NULL;
3120 }
3122 bool os::pd_release_memory(char* addr, size_t bytes) {
3123 size_t size = bytes;
3124 return munmap(addr, size) == 0;
3125 }
3127 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3128 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3129 "addr must be page aligned");
3130 int retVal = mprotect(addr, bytes, prot);
3131 return retVal == 0;
3132 }
3134 // Protect memory (Used to pass readonly pages through
3135 // JNI GetArray<type>Elements with empty arrays.)
3136 // Also, used for serialization page and for compressed oops null pointer
3137 // checking.
3138 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3139 bool is_committed) {
3140 unsigned int p = 0;
3141 switch (prot) {
3142 case MEM_PROT_NONE: p = PROT_NONE; break;
3143 case MEM_PROT_READ: p = PROT_READ; break;
3144 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3145 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3146 default:
3147 ShouldNotReachHere();
3148 }
3149 // is_committed is unused.
3150 return solaris_mprotect(addr, bytes, p);
3151 }
3153 // guard_memory and unguard_memory only happens within stack guard pages.
3154 // Since ISM pertains only to the heap, guard and unguard memory should not
3155 /// happen with an ISM region.
3156 bool os::guard_memory(char* addr, size_t bytes) {
3157 return solaris_mprotect(addr, bytes, PROT_NONE);
3158 }
3160 bool os::unguard_memory(char* addr, size_t bytes) {
3161 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3162 }
3164 // Large page support
3165 static size_t _large_page_size = 0;
3167 // Insertion sort for small arrays (descending order).
3168 static void insertion_sort_descending(size_t* array, int len) {
3169 for (int i = 0; i < len; i++) {
3170 size_t val = array[i];
3171 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3172 size_t tmp = array[key];
3173 array[key] = array[key - 1];
3174 array[key - 1] = tmp;
3175 }
3176 }
3177 }
3179 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3180 const unsigned int usable_count = VM_Version::page_size_count();
3181 if (usable_count == 1) {
3182 return false;
3183 }
3185 // Find the right getpagesizes interface. When solaris 11 is the minimum
3186 // build platform, getpagesizes() (without the '2') can be called directly.
3187 typedef int (*gps_t)(size_t[], int);
3188 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3189 if (gps_func == NULL) {
3190 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3191 if (gps_func == NULL) {
3192 if (warn) {
3193 warning("MPSS is not supported by the operating system.");
3194 }
3195 return false;
3196 }
3197 }
3199 // Fill the array of page sizes.
3200 int n = (*gps_func)(_page_sizes, page_sizes_max);
3201 assert(n > 0, "Solaris bug?");
3203 if (n == page_sizes_max) {
3204 // Add a sentinel value (necessary only if the array was completely filled
3205 // since it is static (zeroed at initialization)).
3206 _page_sizes[--n] = 0;
3207 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3208 }
3209 assert(_page_sizes[n] == 0, "missing sentinel");
3210 trace_page_sizes("available page sizes", _page_sizes, n);
3212 if (n == 1) return false; // Only one page size available.
3214 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3215 // select up to usable_count elements. First sort the array, find the first
3216 // acceptable value, then copy the usable sizes to the top of the array and
3217 // trim the rest. Make sure to include the default page size :-).
3218 //
3219 // A better policy could get rid of the 4M limit by taking the sizes of the
3220 // important VM memory regions (java heap and possibly the code cache) into
3221 // account.
3222 insertion_sort_descending(_page_sizes, n);
3223 const size_t size_limit =
3224 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3225 int beg;
3226 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3227 const int end = MIN2((int)usable_count, n) - 1;
3228 for (int cur = 0; cur < end; ++cur, ++beg) {
3229 _page_sizes[cur] = _page_sizes[beg];
3230 }
3231 _page_sizes[end] = vm_page_size();
3232 _page_sizes[end + 1] = 0;
3234 if (_page_sizes[end] > _page_sizes[end - 1]) {
3235 // Default page size is not the smallest; sort again.
3236 insertion_sort_descending(_page_sizes, end + 1);
3237 }
3238 *page_size = _page_sizes[0];
3240 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3241 return true;
3242 }
3244 void os::large_page_init() {
3245 if (UseLargePages) {
3246 // print a warning if any large page related flag is specified on command line
3247 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3248 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3250 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3251 }
3252 }
3254 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3255 // Signal to OS that we want large pages for addresses
3256 // from addr, addr + bytes
3257 struct memcntl_mha mpss_struct;
3258 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3259 mpss_struct.mha_pagesize = align;
3260 mpss_struct.mha_flags = 0;
3261 // Upon successful completion, memcntl() returns 0
3262 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3263 debug_only(warning("Attempt to use MPSS failed."));
3264 return false;
3265 }
3266 return true;
3267 }
3269 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3270 fatal("os::reserve_memory_special should not be called on Solaris.");
3271 return NULL;
3272 }
3274 bool os::release_memory_special(char* base, size_t bytes) {
3275 fatal("os::release_memory_special should not be called on Solaris.");
3276 return false;
3277 }
3279 size_t os::large_page_size() {
3280 return _large_page_size;
3281 }
3283 // MPSS allows application to commit large page memory on demand; with ISM
3284 // the entire memory region must be allocated as shared memory.
3285 bool os::can_commit_large_page_memory() {
3286 return true;
3287 }
3289 bool os::can_execute_large_page_memory() {
3290 return true;
3291 }
3293 static int os_sleep(jlong millis, bool interruptible) {
3294 const jlong limit = INT_MAX;
3295 jlong prevtime;
3296 int res;
3298 while (millis > limit) {
3299 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3300 return res;
3301 millis -= limit;
3302 }
3304 // Restart interrupted polls with new parameters until the proper delay
3305 // has been completed.
3307 prevtime = getTimeMillis();
3309 while (millis > 0) {
3310 jlong newtime;
3312 if (!interruptible) {
3313 // Following assert fails for os::yield_all:
3314 // assert(!thread->is_Java_thread(), "must not be java thread");
3315 res = poll(NULL, 0, millis);
3316 } else {
3317 JavaThread *jt = JavaThread::current();
3319 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3320 os::Solaris::clear_interrupted);
3321 }
3323 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3324 // thread.Interrupt.
3326 // See c/r 6751923. Poll can return 0 before time
3327 // has elapsed if time is set via clock_settime (as NTP does).
3328 // res == 0 if poll timed out (see man poll RETURN VALUES)
3329 // using the logic below checks that we really did
3330 // sleep at least "millis" if not we'll sleep again.
3331 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3332 newtime = getTimeMillis();
3333 assert(newtime >= prevtime, "time moving backwards");
3334 /* Doing prevtime and newtime in microseconds doesn't help precision,
3335 and trying to round up to avoid lost milliseconds can result in a
3336 too-short delay. */
3337 millis -= newtime - prevtime;
3338 if(millis <= 0)
3339 return OS_OK;
3340 prevtime = newtime;
3341 } else
3342 return res;
3343 }
3345 return OS_OK;
3346 }
3348 // Read calls from inside the vm need to perform state transitions
3349 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3350 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3351 }
3353 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3354 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3355 }
3357 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3358 assert(thread == Thread::current(), "thread consistency check");
3360 // TODO-FIXME: this should be removed.
3361 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3362 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3363 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3364 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3365 // is fooled into believing that the system is making progress. In the code below we block the
3366 // the watcher thread while safepoint is in progress so that it would not appear as though the
3367 // system is making progress.
3368 if (!Solaris::T2_libthread() &&
3369 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3370 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3371 // the entire safepoint, the watcher thread will line up here during the safepoint.
3372 Threads_lock->lock_without_safepoint_check();
3373 Threads_lock->unlock();
3374 }
3376 if (thread->is_Java_thread()) {
3377 // This is a JavaThread so we honor the _thread_blocked protocol
3378 // even for sleeps of 0 milliseconds. This was originally done
3379 // as a workaround for bug 4338139. However, now we also do it
3380 // to honor the suspend-equivalent protocol.
3382 JavaThread *jt = (JavaThread *) thread;
3383 ThreadBlockInVM tbivm(jt);
3385 jt->set_suspend_equivalent();
3386 // cleared by handle_special_suspend_equivalent_condition() or
3387 // java_suspend_self() via check_and_wait_while_suspended()
3389 int ret_code;
3390 if (millis <= 0) {
3391 thr_yield();
3392 ret_code = 0;
3393 } else {
3394 // The original sleep() implementation did not create an
3395 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3396 // I'm preserving that decision for now.
3397 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3399 ret_code = os_sleep(millis, interruptible);
3400 }
3402 // were we externally suspended while we were waiting?
3403 jt->check_and_wait_while_suspended();
3405 return ret_code;
3406 }
3408 // non-JavaThread from this point on:
3410 if (millis <= 0) {
3411 thr_yield();
3412 return 0;
3413 }
3415 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3417 return os_sleep(millis, interruptible);
3418 }
3420 void os::naked_short_sleep(jlong ms) {
3421 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3423 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3424 // Solaris requires -lrt for this.
3425 usleep((ms * 1000));
3427 return;
3428 }
3430 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3431 void os::infinite_sleep() {
3432 while (true) { // sleep forever ...
3433 ::sleep(100); // ... 100 seconds at a time
3434 }
3435 }
3437 // Used to convert frequent JVM_Yield() to nops
3438 bool os::dont_yield() {
3439 if (DontYieldALot) {
3440 static hrtime_t last_time = 0;
3441 hrtime_t diff = getTimeNanos() - last_time;
3443 if (diff < DontYieldALotInterval * 1000000)
3444 return true;
3446 last_time += diff;
3448 return false;
3449 }
3450 else {
3451 return false;
3452 }
3453 }
3455 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3456 // the linux and win32 implementations do not. This should be checked.
3458 void os::yield() {
3459 // Yields to all threads with same or greater priority
3460 os::sleep(Thread::current(), 0, false);
3461 }
3463 // Note that yield semantics are defined by the scheduling class to which
3464 // the thread currently belongs. Typically, yield will _not yield to
3465 // other equal or higher priority threads that reside on the dispatch queues
3466 // of other CPUs.
3468 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3471 // On Solaris we found that yield_all doesn't always yield to all other threads.
3472 // There have been cases where there is a thread ready to execute but it doesn't
3473 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3474 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3475 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3476 // number of times yield_all is called in the one loop and increase the sleep
3477 // time after 8 attempts. If this fails too we increase the concurrency level
3478 // so that the starving thread would get an lwp
3480 void os::yield_all(int attempts) {
3481 // Yields to all threads, including threads with lower priorities
3482 if (attempts == 0) {
3483 os::sleep(Thread::current(), 1, false);
3484 } else {
3485 int iterations = attempts % 30;
3486 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3487 // thr_setconcurrency and _getconcurrency make sense only under T1.
3488 int noofLWPS = thr_getconcurrency();
3489 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3490 thr_setconcurrency(thr_getconcurrency() + 1);
3491 }
3492 } else if (iterations < 25) {
3493 os::sleep(Thread::current(), 1, false);
3494 } else {
3495 os::sleep(Thread::current(), 10, false);
3496 }
3497 }
3498 }
3500 // Called from the tight loops to possibly influence time-sharing heuristics
3501 void os::loop_breaker(int attempts) {
3502 os::yield_all(attempts);
3503 }
3506 // Interface for setting lwp priorities. If we are using T2 libthread,
3507 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3508 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3509 // function is meaningless in this mode so we must adjust the real lwp's priority
3510 // The routines below implement the getting and setting of lwp priorities.
3511 //
3512 // Note: There are three priority scales used on Solaris. Java priotities
3513 // which range from 1 to 10, libthread "thr_setprio" scale which range
3514 // from 0 to 127, and the current scheduling class of the process we
3515 // are running in. This is typically from -60 to +60.
3516 // The setting of the lwp priorities in done after a call to thr_setprio
3517 // so Java priorities are mapped to libthread priorities and we map from
3518 // the latter to lwp priorities. We don't keep priorities stored in
3519 // Java priorities since some of our worker threads want to set priorities
3520 // higher than all Java threads.
3521 //
3522 // For related information:
3523 // (1) man -s 2 priocntl
3524 // (2) man -s 4 priocntl
3525 // (3) man dispadmin
3526 // = librt.so
3527 // = libthread/common/rtsched.c - thrp_setlwpprio().
3528 // = ps -cL <pid> ... to validate priority.
3529 // = sched_get_priority_min and _max
3530 // pthread_create
3531 // sched_setparam
3532 // pthread_setschedparam
3533 //
3534 // Assumptions:
3535 // + We assume that all threads in the process belong to the same
3536 // scheduling class. IE. an homogenous process.
3537 // + Must be root or in IA group to change change "interactive" attribute.
3538 // Priocntl() will fail silently. The only indication of failure is when
3539 // we read-back the value and notice that it hasn't changed.
3540 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3541 // + For RT, change timeslice as well. Invariant:
3542 // constant "priority integral"
3543 // Konst == TimeSlice * (60-Priority)
3544 // Given a priority, compute appropriate timeslice.
3545 // + Higher numerical values have higher priority.
3547 // sched class attributes
3548 typedef struct {
3549 int schedPolicy; // classID
3550 int maxPrio;
3551 int minPrio;
3552 } SchedInfo;
3555 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3557 #ifdef ASSERT
3558 static int ReadBackValidate = 1;
3559 #endif
3560 static int myClass = 0;
3561 static int myMin = 0;
3562 static int myMax = 0;
3563 static int myCur = 0;
3564 static bool priocntl_enable = false;
3566 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3567 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3570 // lwp_priocntl_init
3571 //
3572 // Try to determine the priority scale for our process.
3573 //
3574 // Return errno or 0 if OK.
3575 //
3576 static int lwp_priocntl_init () {
3577 int rslt;
3578 pcinfo_t ClassInfo;
3579 pcparms_t ParmInfo;
3580 int i;
3582 if (!UseThreadPriorities) return 0;
3584 // We are using Bound threads, we need to determine our priority ranges
3585 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3586 // If ThreadPriorityPolicy is 1, switch tables
3587 if (ThreadPriorityPolicy == 1) {
3588 for (i = 0 ; i < CriticalPriority+1; i++)
3589 os::java_to_os_priority[i] = prio_policy1[i];
3590 }
3591 if (UseCriticalJavaThreadPriority) {
3592 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3593 // See set_native_priority() and set_lwp_class_and_priority().
3594 // Save original MaxPriority mapping in case attempt to
3595 // use critical priority fails.
3596 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3597 // Set negative to distinguish from other priorities
3598 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3599 }
3600 }
3601 // Not using Bound Threads, set to ThreadPolicy 1
3602 else {
3603 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3604 os::java_to_os_priority[i] = prio_policy1[i];
3605 }
3606 return 0;
3607 }
3609 // Get IDs for a set of well-known scheduling classes.
3610 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3611 // the system. We should have a loop that iterates over the
3612 // classID values, which are known to be "small" integers.
3614 strcpy(ClassInfo.pc_clname, "TS");
3615 ClassInfo.pc_cid = -1;
3616 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3617 if (rslt < 0) return errno;
3618 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3619 tsLimits.schedPolicy = ClassInfo.pc_cid;
3620 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3621 tsLimits.minPrio = -tsLimits.maxPrio;
3623 strcpy(ClassInfo.pc_clname, "IA");
3624 ClassInfo.pc_cid = -1;
3625 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3626 if (rslt < 0) return errno;
3627 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3628 iaLimits.schedPolicy = ClassInfo.pc_cid;
3629 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3630 iaLimits.minPrio = -iaLimits.maxPrio;
3632 strcpy(ClassInfo.pc_clname, "RT");
3633 ClassInfo.pc_cid = -1;
3634 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3635 if (rslt < 0) return errno;
3636 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3637 rtLimits.schedPolicy = ClassInfo.pc_cid;
3638 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3639 rtLimits.minPrio = 0;
3641 strcpy(ClassInfo.pc_clname, "FX");
3642 ClassInfo.pc_cid = -1;
3643 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3644 if (rslt < 0) return errno;
3645 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3646 fxLimits.schedPolicy = ClassInfo.pc_cid;
3647 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3648 fxLimits.minPrio = 0;
3650 // Query our "current" scheduling class.
3651 // This will normally be IA, TS or, rarely, FX or RT.
3652 memset(&ParmInfo, 0, sizeof(ParmInfo));
3653 ParmInfo.pc_cid = PC_CLNULL;
3654 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3655 if (rslt < 0) return errno;
3656 myClass = ParmInfo.pc_cid;
3658 // We now know our scheduling classId, get specific information
3659 // about the class.
3660 ClassInfo.pc_cid = myClass;
3661 ClassInfo.pc_clname[0] = 0;
3662 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3663 if (rslt < 0) return errno;
3665 if (ThreadPriorityVerbose) {
3666 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3667 }
3669 memset(&ParmInfo, 0, sizeof(pcparms_t));
3670 ParmInfo.pc_cid = PC_CLNULL;
3671 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3672 if (rslt < 0) return errno;
3674 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3675 myMin = rtLimits.minPrio;
3676 myMax = rtLimits.maxPrio;
3677 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3678 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3679 myMin = iaLimits.minPrio;
3680 myMax = iaLimits.maxPrio;
3681 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3682 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3683 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3684 myMin = tsLimits.minPrio;
3685 myMax = tsLimits.maxPrio;
3686 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3687 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3688 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3689 myMin = fxLimits.minPrio;
3690 myMax = fxLimits.maxPrio;
3691 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3692 } else {
3693 // No clue - punt
3694 if (ThreadPriorityVerbose)
3695 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3696 return EINVAL; // no clue, punt
3697 }
3699 if (ThreadPriorityVerbose) {
3700 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3701 }
3703 priocntl_enable = true; // Enable changing priorities
3704 return 0;
3705 }
3707 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3708 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3709 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3710 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3713 // scale_to_lwp_priority
3714 //
3715 // Convert from the libthread "thr_setprio" scale to our current
3716 // lwp scheduling class scale.
3717 //
3718 static
3719 int scale_to_lwp_priority (int rMin, int rMax, int x)
3720 {
3721 int v;
3723 if (x == 127) return rMax; // avoid round-down
3724 v = (((x*(rMax-rMin)))/128)+rMin;
3725 return v;
3726 }
3729 // set_lwp_class_and_priority
3730 //
3731 // Set the class and priority of the lwp. This call should only
3732 // be made when using bound threads (T2 threads are bound by default).
3733 //
3734 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3735 int newPrio, int new_class, bool scale) {
3736 int rslt;
3737 int Actual, Expected, prv;
3738 pcparms_t ParmInfo; // for GET-SET
3739 #ifdef ASSERT
3740 pcparms_t ReadBack; // for readback
3741 #endif
3743 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3744 // Query current values.
3745 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3746 // Cache "pcparms_t" in global ParmCache.
3747 // TODO: elide set-to-same-value
3749 // If something went wrong on init, don't change priorities.
3750 if ( !priocntl_enable ) {
3751 if (ThreadPriorityVerbose)
3752 tty->print_cr("Trying to set priority but init failed, ignoring");
3753 return EINVAL;
3754 }
3756 // If lwp hasn't started yet, just return
3757 // the _start routine will call us again.
3758 if ( lwpid <= 0 ) {
3759 if (ThreadPriorityVerbose) {
3760 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3761 INTPTR_FORMAT " to %d, lwpid not set",
3762 ThreadID, newPrio);
3763 }
3764 return 0;
3765 }
3767 if (ThreadPriorityVerbose) {
3768 tty->print_cr ("set_lwp_class_and_priority("
3769 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3770 ThreadID, lwpid, newPrio);
3771 }
3773 memset(&ParmInfo, 0, sizeof(pcparms_t));
3774 ParmInfo.pc_cid = PC_CLNULL;
3775 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3776 if (rslt < 0) return errno;
3778 int cur_class = ParmInfo.pc_cid;
3779 ParmInfo.pc_cid = (id_t)new_class;
3781 if (new_class == rtLimits.schedPolicy) {
3782 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3783 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3784 rtLimits.maxPrio, newPrio)
3785 : newPrio;
3786 rtInfo->rt_tqsecs = RT_NOCHANGE;
3787 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3788 if (ThreadPriorityVerbose) {
3789 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3790 }
3791 } else if (new_class == iaLimits.schedPolicy) {
3792 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3793 int maxClamped = MIN2(iaLimits.maxPrio,
3794 cur_class == new_class
3795 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3796 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3797 maxClamped, newPrio)
3798 : newPrio;
3799 iaInfo->ia_uprilim = cur_class == new_class
3800 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3801 iaInfo->ia_mode = IA_NOCHANGE;
3802 if (ThreadPriorityVerbose) {
3803 tty->print_cr("IA: [%d...%d] %d->%d\n",
3804 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3805 }
3806 } else if (new_class == tsLimits.schedPolicy) {
3807 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3808 int maxClamped = MIN2(tsLimits.maxPrio,
3809 cur_class == new_class
3810 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3811 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3812 maxClamped, newPrio)
3813 : newPrio;
3814 tsInfo->ts_uprilim = cur_class == new_class
3815 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3816 if (ThreadPriorityVerbose) {
3817 tty->print_cr("TS: [%d...%d] %d->%d\n",
3818 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3819 }
3820 } else if (new_class == fxLimits.schedPolicy) {
3821 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3822 int maxClamped = MIN2(fxLimits.maxPrio,
3823 cur_class == new_class
3824 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3825 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3826 maxClamped, newPrio)
3827 : newPrio;
3828 fxInfo->fx_uprilim = cur_class == new_class
3829 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3830 fxInfo->fx_tqsecs = FX_NOCHANGE;
3831 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3832 if (ThreadPriorityVerbose) {
3833 tty->print_cr("FX: [%d...%d] %d->%d\n",
3834 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3835 }
3836 } else {
3837 if (ThreadPriorityVerbose) {
3838 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3839 }
3840 return EINVAL; // no clue, punt
3841 }
3843 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3844 if (ThreadPriorityVerbose && rslt) {
3845 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3846 }
3847 if (rslt < 0) return errno;
3849 #ifdef ASSERT
3850 // Sanity check: read back what we just attempted to set.
3851 // In theory it could have changed in the interim ...
3852 //
3853 // The priocntl system call is tricky.
3854 // Sometimes it'll validate the priority value argument and
3855 // return EINVAL if unhappy. At other times it fails silently.
3856 // Readbacks are prudent.
3858 if (!ReadBackValidate) return 0;
3860 memset(&ReadBack, 0, sizeof(pcparms_t));
3861 ReadBack.pc_cid = PC_CLNULL;
3862 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3863 assert(rslt >= 0, "priocntl failed");
3864 Actual = Expected = 0xBAD;
3865 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3866 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3867 Actual = RTPRI(ReadBack)->rt_pri;
3868 Expected = RTPRI(ParmInfo)->rt_pri;
3869 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3870 Actual = IAPRI(ReadBack)->ia_upri;
3871 Expected = IAPRI(ParmInfo)->ia_upri;
3872 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3873 Actual = TSPRI(ReadBack)->ts_upri;
3874 Expected = TSPRI(ParmInfo)->ts_upri;
3875 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3876 Actual = FXPRI(ReadBack)->fx_upri;
3877 Expected = FXPRI(ParmInfo)->fx_upri;
3878 } else {
3879 if (ThreadPriorityVerbose) {
3880 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3881 ParmInfo.pc_cid);
3882 }
3883 }
3885 if (Actual != Expected) {
3886 if (ThreadPriorityVerbose) {
3887 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3888 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3889 }
3890 }
3891 #endif
3893 return 0;
3894 }
3896 // Solaris only gives access to 128 real priorities at a time,
3897 // so we expand Java's ten to fill this range. This would be better
3898 // if we dynamically adjusted relative priorities.
3899 //
3900 // The ThreadPriorityPolicy option allows us to select 2 different
3901 // priority scales.
3902 //
3903 // ThreadPriorityPolicy=0
3904 // Since the Solaris' default priority is MaximumPriority, we do not
3905 // set a priority lower than Max unless a priority lower than
3906 // NormPriority is requested.
3907 //
3908 // ThreadPriorityPolicy=1
3909 // This mode causes the priority table to get filled with
3910 // linear values. NormPriority get's mapped to 50% of the
3911 // Maximum priority an so on. This will cause VM threads
3912 // to get unfair treatment against other Solaris processes
3913 // which do not explicitly alter their thread priorities.
3914 //
3916 int os::java_to_os_priority[CriticalPriority + 1] = {
3917 -99999, // 0 Entry should never be used
3919 0, // 1 MinPriority
3920 32, // 2
3921 64, // 3
3923 96, // 4
3924 127, // 5 NormPriority
3925 127, // 6
3927 127, // 7
3928 127, // 8
3929 127, // 9 NearMaxPriority
3931 127, // 10 MaxPriority
3933 -criticalPrio // 11 CriticalPriority
3934 };
3936 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3937 OSThread* osthread = thread->osthread();
3939 // Save requested priority in case the thread hasn't been started
3940 osthread->set_native_priority(newpri);
3942 // Check for critical priority request
3943 bool fxcritical = false;
3944 if (newpri == -criticalPrio) {
3945 fxcritical = true;
3946 newpri = criticalPrio;
3947 }
3949 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3950 if (!UseThreadPriorities) return OS_OK;
3952 int status = 0;
3954 if (!fxcritical) {
3955 // Use thr_setprio only if we have a priority that thr_setprio understands
3956 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3957 }
3959 if (os::Solaris::T2_libthread() ||
3960 (UseBoundThreads && osthread->is_vm_created())) {
3961 int lwp_status =
3962 set_lwp_class_and_priority(osthread->thread_id(),
3963 osthread->lwp_id(),
3964 newpri,
3965 fxcritical ? fxLimits.schedPolicy : myClass,
3966 !fxcritical);
3967 if (lwp_status != 0 && fxcritical) {
3968 // Try again, this time without changing the scheduling class
3969 newpri = java_MaxPriority_to_os_priority;
3970 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3971 osthread->lwp_id(),
3972 newpri, myClass, false);
3973 }
3974 status |= lwp_status;
3975 }
3976 return (status == 0) ? OS_OK : OS_ERR;
3977 }
3980 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3981 int p;
3982 if ( !UseThreadPriorities ) {
3983 *priority_ptr = NormalPriority;
3984 return OS_OK;
3985 }
3986 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3987 if (status != 0) {
3988 return OS_ERR;
3989 }
3990 *priority_ptr = p;
3991 return OS_OK;
3992 }
3995 // Hint to the underlying OS that a task switch would not be good.
3996 // Void return because it's a hint and can fail.
3997 void os::hint_no_preempt() {
3998 schedctl_start(schedctl_init());
3999 }
4001 static void resume_clear_context(OSThread *osthread) {
4002 osthread->set_ucontext(NULL);
4003 }
4005 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
4006 osthread->set_ucontext(context);
4007 }
4009 static Semaphore sr_semaphore;
4011 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
4012 // Save and restore errno to avoid confusing native code with EINTR
4013 // after sigsuspend.
4014 int old_errno = errno;
4016 OSThread* osthread = thread->osthread();
4017 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
4019 os::SuspendResume::State current = osthread->sr.state();
4020 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
4021 suspend_save_context(osthread, uc);
4023 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
4024 os::SuspendResume::State state = osthread->sr.suspended();
4025 if (state == os::SuspendResume::SR_SUSPENDED) {
4026 sigset_t suspend_set; // signals for sigsuspend()
4028 // get current set of blocked signals and unblock resume signal
4029 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
4030 sigdelset(&suspend_set, os::Solaris::SIGasync());
4032 sr_semaphore.signal();
4033 // wait here until we are resumed
4034 while (1) {
4035 sigsuspend(&suspend_set);
4037 os::SuspendResume::State result = osthread->sr.running();
4038 if (result == os::SuspendResume::SR_RUNNING) {
4039 sr_semaphore.signal();
4040 break;
4041 }
4042 }
4044 } else if (state == os::SuspendResume::SR_RUNNING) {
4045 // request was cancelled, continue
4046 } else {
4047 ShouldNotReachHere();
4048 }
4050 resume_clear_context(osthread);
4051 } else if (current == os::SuspendResume::SR_RUNNING) {
4052 // request was cancelled, continue
4053 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
4054 // ignore
4055 } else {
4056 // ignore
4057 }
4059 errno = old_errno;
4060 }
4063 void os::interrupt(Thread* thread) {
4064 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4066 OSThread* osthread = thread->osthread();
4068 int isInterrupted = osthread->interrupted();
4069 if (!isInterrupted) {
4070 osthread->set_interrupted(true);
4071 OrderAccess::fence();
4072 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4073 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4074 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4075 ParkEvent * const slp = thread->_SleepEvent ;
4076 if (slp != NULL) slp->unpark() ;
4077 }
4079 // For JSR166: unpark after setting status but before thr_kill -dl
4080 if (thread->is_Java_thread()) {
4081 ((JavaThread*)thread)->parker()->unpark();
4082 }
4084 // Handle interruptible wait() ...
4085 ParkEvent * const ev = thread->_ParkEvent ;
4086 if (ev != NULL) ev->unpark() ;
4088 // When events are used everywhere for os::sleep, then this thr_kill
4089 // will only be needed if UseVMInterruptibleIO is true.
4091 if (!isInterrupted) {
4092 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4093 assert_status(status == 0, status, "thr_kill");
4095 // Bump thread interruption counter
4096 RuntimeService::record_thread_interrupt_signaled_count();
4097 }
4098 }
4101 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4102 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4104 OSThread* osthread = thread->osthread();
4106 bool res = osthread->interrupted();
4108 // NOTE that since there is no "lock" around these two operations,
4109 // there is the possibility that the interrupted flag will be
4110 // "false" but that the interrupt event will be set. This is
4111 // intentional. The effect of this is that Object.wait() will appear
4112 // to have a spurious wakeup, which is not harmful, and the
4113 // possibility is so rare that it is not worth the added complexity
4114 // to add yet another lock. It has also been recommended not to put
4115 // the interrupted flag into the os::Solaris::Event structure,
4116 // because it hides the issue.
4117 if (res && clear_interrupted) {
4118 osthread->set_interrupted(false);
4119 }
4120 return res;
4121 }
4124 void os::print_statistics() {
4125 }
4127 int os::message_box(const char* title, const char* message) {
4128 int i;
4129 fdStream err(defaultStream::error_fd());
4130 for (i = 0; i < 78; i++) err.print_raw("=");
4131 err.cr();
4132 err.print_raw_cr(title);
4133 for (i = 0; i < 78; i++) err.print_raw("-");
4134 err.cr();
4135 err.print_raw_cr(message);
4136 for (i = 0; i < 78; i++) err.print_raw("=");
4137 err.cr();
4139 char buf[16];
4140 // Prevent process from exiting upon "read error" without consuming all CPU
4141 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4143 return buf[0] == 'y' || buf[0] == 'Y';
4144 }
4146 static int sr_notify(OSThread* osthread) {
4147 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4148 assert_status(status == 0, status, "thr_kill");
4149 return status;
4150 }
4152 // "Randomly" selected value for how long we want to spin
4153 // before bailing out on suspending a thread, also how often
4154 // we send a signal to a thread we want to resume
4155 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4156 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4158 static bool do_suspend(OSThread* osthread) {
4159 assert(osthread->sr.is_running(), "thread should be running");
4160 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4162 // mark as suspended and send signal
4163 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4164 // failed to switch, state wasn't running?
4165 ShouldNotReachHere();
4166 return false;
4167 }
4169 if (sr_notify(osthread) != 0) {
4170 ShouldNotReachHere();
4171 }
4173 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4174 while (true) {
4175 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4176 break;
4177 } else {
4178 // timeout
4179 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4180 if (cancelled == os::SuspendResume::SR_RUNNING) {
4181 return false;
4182 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4183 // make sure that we consume the signal on the semaphore as well
4184 sr_semaphore.wait();
4185 break;
4186 } else {
4187 ShouldNotReachHere();
4188 return false;
4189 }
4190 }
4191 }
4193 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4194 return true;
4195 }
4197 static void do_resume(OSThread* osthread) {
4198 assert(osthread->sr.is_suspended(), "thread should be suspended");
4199 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4201 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4202 // failed to switch to WAKEUP_REQUEST
4203 ShouldNotReachHere();
4204 return;
4205 }
4207 while (true) {
4208 if (sr_notify(osthread) == 0) {
4209 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4210 if (osthread->sr.is_running()) {
4211 return;
4212 }
4213 }
4214 } else {
4215 ShouldNotReachHere();
4216 }
4217 }
4219 guarantee(osthread->sr.is_running(), "Must be running!");
4220 }
4222 void os::SuspendedThreadTask::internal_do_task() {
4223 if (do_suspend(_thread->osthread())) {
4224 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4225 do_task(context);
4226 do_resume(_thread->osthread());
4227 }
4228 }
4230 class PcFetcher : public os::SuspendedThreadTask {
4231 public:
4232 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4233 ExtendedPC result();
4234 protected:
4235 void do_task(const os::SuspendedThreadTaskContext& context);
4236 private:
4237 ExtendedPC _epc;
4238 };
4240 ExtendedPC PcFetcher::result() {
4241 guarantee(is_done(), "task is not done yet.");
4242 return _epc;
4243 }
4245 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4246 Thread* thread = context.thread();
4247 OSThread* osthread = thread->osthread();
4248 if (osthread->ucontext() != NULL) {
4249 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4250 } else {
4251 // NULL context is unexpected, double-check this is the VMThread
4252 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4253 }
4254 }
4256 // A lightweight implementation that does not suspend the target thread and
4257 // thus returns only a hint. Used for profiling only!
4258 ExtendedPC os::get_thread_pc(Thread* thread) {
4259 // Make sure that it is called by the watcher and the Threads lock is owned.
4260 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4261 // For now, is only used to profile the VM Thread
4262 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4263 PcFetcher fetcher(thread);
4264 fetcher.run();
4265 return fetcher.result();
4266 }
4269 // This does not do anything on Solaris. This is basically a hook for being
4270 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4271 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4272 f(value, method, args, thread);
4273 }
4275 // This routine may be used by user applications as a "hook" to catch signals.
4276 // The user-defined signal handler must pass unrecognized signals to this
4277 // routine, and if it returns true (non-zero), then the signal handler must
4278 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4279 // routine will never retun false (zero), but instead will execute a VM panic
4280 // routine kill the process.
4281 //
4282 // If this routine returns false, it is OK to call it again. This allows
4283 // the user-defined signal handler to perform checks either before or after
4284 // the VM performs its own checks. Naturally, the user code would be making
4285 // a serious error if it tried to handle an exception (such as a null check
4286 // or breakpoint) that the VM was generating for its own correct operation.
4287 //
4288 // This routine may recognize any of the following kinds of signals:
4289 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4290 // os::Solaris::SIGasync
4291 // It should be consulted by handlers for any of those signals.
4292 // It explicitly does not recognize os::Solaris::SIGinterrupt
4293 //
4294 // The caller of this routine must pass in the three arguments supplied
4295 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4296 // field of the structure passed to sigaction(). This routine assumes that
4297 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4298 //
4299 // Note that the VM will print warnings if it detects conflicting signal
4300 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4301 //
4302 extern "C" JNIEXPORT int
4303 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4304 int abort_if_unrecognized);
4307 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4308 int orig_errno = errno; // Preserve errno value over signal handler.
4309 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4310 errno = orig_errno;
4311 }
4313 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4314 is needed to provoke threads blocked on IO to return an EINTR
4315 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4316 does NOT participate in signal chaining due to requirement for
4317 NOT setting SA_RESTART to make EINTR work. */
4318 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4319 if (UseSignalChaining) {
4320 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4321 if (actp && actp->sa_handler) {
4322 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4323 }
4324 }
4325 }
4327 // This boolean allows users to forward their own non-matching signals
4328 // to JVM_handle_solaris_signal, harmlessly.
4329 bool os::Solaris::signal_handlers_are_installed = false;
4331 // For signal-chaining
4332 bool os::Solaris::libjsig_is_loaded = false;
4333 typedef struct sigaction *(*get_signal_t)(int);
4334 get_signal_t os::Solaris::get_signal_action = NULL;
4336 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4337 struct sigaction *actp = NULL;
4339 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4340 // Retrieve the old signal handler from libjsig
4341 actp = (*get_signal_action)(sig);
4342 }
4343 if (actp == NULL) {
4344 // Retrieve the preinstalled signal handler from jvm
4345 actp = get_preinstalled_handler(sig);
4346 }
4348 return actp;
4349 }
4351 static bool call_chained_handler(struct sigaction *actp, int sig,
4352 siginfo_t *siginfo, void *context) {
4353 // Call the old signal handler
4354 if (actp->sa_handler == SIG_DFL) {
4355 // It's more reasonable to let jvm treat it as an unexpected exception
4356 // instead of taking the default action.
4357 return false;
4358 } else if (actp->sa_handler != SIG_IGN) {
4359 if ((actp->sa_flags & SA_NODEFER) == 0) {
4360 // automaticlly block the signal
4361 sigaddset(&(actp->sa_mask), sig);
4362 }
4364 sa_handler_t hand;
4365 sa_sigaction_t sa;
4366 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4367 // retrieve the chained handler
4368 if (siginfo_flag_set) {
4369 sa = actp->sa_sigaction;
4370 } else {
4371 hand = actp->sa_handler;
4372 }
4374 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4375 actp->sa_handler = SIG_DFL;
4376 }
4378 // try to honor the signal mask
4379 sigset_t oset;
4380 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4382 // call into the chained handler
4383 if (siginfo_flag_set) {
4384 (*sa)(sig, siginfo, context);
4385 } else {
4386 (*hand)(sig);
4387 }
4389 // restore the signal mask
4390 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4391 }
4392 // Tell jvm's signal handler the signal is taken care of.
4393 return true;
4394 }
4396 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4397 bool chained = false;
4398 // signal-chaining
4399 if (UseSignalChaining) {
4400 struct sigaction *actp = get_chained_signal_action(sig);
4401 if (actp != NULL) {
4402 chained = call_chained_handler(actp, sig, siginfo, context);
4403 }
4404 }
4405 return chained;
4406 }
4408 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4409 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4410 if (preinstalled_sigs[sig] != 0) {
4411 return &chainedsigactions[sig];
4412 }
4413 return NULL;
4414 }
4416 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4418 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4419 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4420 chainedsigactions[sig] = oldAct;
4421 preinstalled_sigs[sig] = 1;
4422 }
4424 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4425 // Check for overwrite.
4426 struct sigaction oldAct;
4427 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4428 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4429 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4430 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4431 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4432 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4433 if (AllowUserSignalHandlers || !set_installed) {
4434 // Do not overwrite; user takes responsibility to forward to us.
4435 return;
4436 } else if (UseSignalChaining) {
4437 if (oktochain) {
4438 // save the old handler in jvm
4439 save_preinstalled_handler(sig, oldAct);
4440 } else {
4441 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4442 }
4443 // libjsig also interposes the sigaction() call below and saves the
4444 // old sigaction on it own.
4445 } else {
4446 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4447 "%#lx for signal %d.", (long)oldhand, sig));
4448 }
4449 }
4451 struct sigaction sigAct;
4452 sigfillset(&(sigAct.sa_mask));
4453 sigAct.sa_handler = SIG_DFL;
4455 sigAct.sa_sigaction = signalHandler;
4456 // Handle SIGSEGV on alternate signal stack if
4457 // not using stack banging
4458 if (!UseStackBanging && sig == SIGSEGV) {
4459 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4460 // Interruptible i/o requires SA_RESTART cleared so EINTR
4461 // is returned instead of restarting system calls
4462 } else if (sig == os::Solaris::SIGinterrupt()) {
4463 sigemptyset(&sigAct.sa_mask);
4464 sigAct.sa_handler = NULL;
4465 sigAct.sa_flags = SA_SIGINFO;
4466 sigAct.sa_sigaction = sigINTRHandler;
4467 } else {
4468 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4469 }
4470 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4472 sigaction(sig, &sigAct, &oldAct);
4474 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4475 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4476 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4477 }
4480 #define DO_SIGNAL_CHECK(sig) \
4481 if (!sigismember(&check_signal_done, sig)) \
4482 os::Solaris::check_signal_handler(sig)
4484 // This method is a periodic task to check for misbehaving JNI applications
4485 // under CheckJNI, we can add any periodic checks here
4487 void os::run_periodic_checks() {
4488 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4489 // thereby preventing a NULL checks.
4490 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4492 if (check_signals == false) return;
4494 // SEGV and BUS if overridden could potentially prevent
4495 // generation of hs*.log in the event of a crash, debugging
4496 // such a case can be very challenging, so we absolutely
4497 // check for the following for a good measure:
4498 DO_SIGNAL_CHECK(SIGSEGV);
4499 DO_SIGNAL_CHECK(SIGILL);
4500 DO_SIGNAL_CHECK(SIGFPE);
4501 DO_SIGNAL_CHECK(SIGBUS);
4502 DO_SIGNAL_CHECK(SIGPIPE);
4503 DO_SIGNAL_CHECK(SIGXFSZ);
4505 // ReduceSignalUsage allows the user to override these handlers
4506 // see comments at the very top and jvm_solaris.h
4507 if (!ReduceSignalUsage) {
4508 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4509 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4510 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4511 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4512 }
4514 // See comments above for using JVM1/JVM2 and UseAltSigs
4515 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4516 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4518 }
4520 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4522 static os_sigaction_t os_sigaction = NULL;
4524 void os::Solaris::check_signal_handler(int sig) {
4525 char buf[O_BUFLEN];
4526 address jvmHandler = NULL;
4528 struct sigaction act;
4529 if (os_sigaction == NULL) {
4530 // only trust the default sigaction, in case it has been interposed
4531 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4532 if (os_sigaction == NULL) return;
4533 }
4535 os_sigaction(sig, (struct sigaction*)NULL, &act);
4537 address thisHandler = (act.sa_flags & SA_SIGINFO)
4538 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4539 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4542 switch(sig) {
4543 case SIGSEGV:
4544 case SIGBUS:
4545 case SIGFPE:
4546 case SIGPIPE:
4547 case SIGXFSZ:
4548 case SIGILL:
4549 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4550 break;
4552 case SHUTDOWN1_SIGNAL:
4553 case SHUTDOWN2_SIGNAL:
4554 case SHUTDOWN3_SIGNAL:
4555 case BREAK_SIGNAL:
4556 jvmHandler = (address)user_handler();
4557 break;
4559 default:
4560 int intrsig = os::Solaris::SIGinterrupt();
4561 int asynsig = os::Solaris::SIGasync();
4563 if (sig == intrsig) {
4564 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4565 } else if (sig == asynsig) {
4566 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4567 } else {
4568 return;
4569 }
4570 break;
4571 }
4574 if (thisHandler != jvmHandler) {
4575 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4576 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4577 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4578 // No need to check this sig any longer
4579 sigaddset(&check_signal_done, sig);
4580 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4581 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4582 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4583 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4584 // No need to check this sig any longer
4585 sigaddset(&check_signal_done, sig);
4586 }
4588 // Print all the signal handler state
4589 if (sigismember(&check_signal_done, sig)) {
4590 print_signal_handlers(tty, buf, O_BUFLEN);
4591 }
4593 }
4595 void os::Solaris::install_signal_handlers() {
4596 bool libjsigdone = false;
4597 signal_handlers_are_installed = true;
4599 // signal-chaining
4600 typedef void (*signal_setting_t)();
4601 signal_setting_t begin_signal_setting = NULL;
4602 signal_setting_t end_signal_setting = NULL;
4603 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4604 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4605 if (begin_signal_setting != NULL) {
4606 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4607 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4608 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4609 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4610 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4611 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4612 libjsig_is_loaded = true;
4613 if (os::Solaris::get_libjsig_version != NULL) {
4614 libjsigversion = (*os::Solaris::get_libjsig_version)();
4615 }
4616 assert(UseSignalChaining, "should enable signal-chaining");
4617 }
4618 if (libjsig_is_loaded) {
4619 // Tell libjsig jvm is setting signal handlers
4620 (*begin_signal_setting)();
4621 }
4623 set_signal_handler(SIGSEGV, true, true);
4624 set_signal_handler(SIGPIPE, true, true);
4625 set_signal_handler(SIGXFSZ, true, true);
4626 set_signal_handler(SIGBUS, true, true);
4627 set_signal_handler(SIGILL, true, true);
4628 set_signal_handler(SIGFPE, true, true);
4631 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4633 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4634 // can not register overridable signals which might be > 32
4635 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4636 // Tell libjsig jvm has finished setting signal handlers
4637 (*end_signal_setting)();
4638 libjsigdone = true;
4639 }
4640 }
4642 // Never ok to chain our SIGinterrupt
4643 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4644 set_signal_handler(os::Solaris::SIGasync(), true, true);
4646 if (libjsig_is_loaded && !libjsigdone) {
4647 // Tell libjsig jvm finishes setting signal handlers
4648 (*end_signal_setting)();
4649 }
4651 // We don't activate signal checker if libjsig is in place, we trust ourselves
4652 // and if UserSignalHandler is installed all bets are off.
4653 // Log that signal checking is off only if -verbose:jni is specified.
4654 if (CheckJNICalls) {
4655 if (libjsig_is_loaded) {
4656 if (PrintJNIResolving) {
4657 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4658 }
4659 check_signals = false;
4660 }
4661 if (AllowUserSignalHandlers) {
4662 if (PrintJNIResolving) {
4663 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4664 }
4665 check_signals = false;
4666 }
4667 }
4668 }
4671 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4673 const char * signames[] = {
4674 "SIG0",
4675 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4676 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4677 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4678 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4679 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4680 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4681 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4682 "SIGCANCEL", "SIGLOST"
4683 };
4685 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4686 if (0 < exception_code && exception_code <= SIGRTMAX) {
4687 // signal
4688 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4689 jio_snprintf(buf, size, "%s", signames[exception_code]);
4690 } else {
4691 jio_snprintf(buf, size, "SIG%d", exception_code);
4692 }
4693 return buf;
4694 } else {
4695 return NULL;
4696 }
4697 }
4699 // (Static) wrappers for the new libthread API
4700 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4701 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4702 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4703 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4704 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4706 // (Static) wrapper for getisax(2) call.
4707 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4709 // (Static) wrappers for the liblgrp API
4710 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4711 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4712 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4713 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4714 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4715 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4716 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4717 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4718 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4720 // (Static) wrapper for meminfo() call.
4721 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4723 static address resolve_symbol_lazy(const char* name) {
4724 address addr = (address) dlsym(RTLD_DEFAULT, name);
4725 if(addr == NULL) {
4726 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4727 addr = (address) dlsym(RTLD_NEXT, name);
4728 }
4729 return addr;
4730 }
4732 static address resolve_symbol(const char* name) {
4733 address addr = resolve_symbol_lazy(name);
4734 if(addr == NULL) {
4735 fatal(dlerror());
4736 }
4737 return addr;
4738 }
4742 // isT2_libthread()
4743 //
4744 // Routine to determine if we are currently using the new T2 libthread.
4745 //
4746 // We determine if we are using T2 by reading /proc/self/lstatus and
4747 // looking for a thread with the ASLWP bit set. If we find this status
4748 // bit set, we must assume that we are NOT using T2. The T2 team
4749 // has approved this algorithm.
4750 //
4751 // We need to determine if we are running with the new T2 libthread
4752 // since setting native thread priorities is handled differently
4753 // when using this library. All threads created using T2 are bound
4754 // threads. Calling thr_setprio is meaningless in this case.
4755 //
4756 bool isT2_libthread() {
4757 static prheader_t * lwpArray = NULL;
4758 static int lwpSize = 0;
4759 static int lwpFile = -1;
4760 lwpstatus_t * that;
4761 char lwpName [128];
4762 bool isT2 = false;
4764 #define ADR(x) ((uintptr_t)(x))
4765 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4767 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4768 if (lwpFile < 0) {
4769 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4770 return false;
4771 }
4772 lwpSize = 16*1024;
4773 for (;;) {
4774 ::lseek64 (lwpFile, 0, SEEK_SET);
4775 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4776 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4777 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4778 break;
4779 }
4780 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4781 // We got a good snapshot - now iterate over the list.
4782 int aslwpcount = 0;
4783 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4784 that = LWPINDEX(lwpArray,i);
4785 if (that->pr_flags & PR_ASLWP) {
4786 aslwpcount++;
4787 }
4788 }
4789 if (aslwpcount == 0) isT2 = true;
4790 break;
4791 }
4792 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4793 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4794 }
4796 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4797 ::close (lwpFile);
4798 if (ThreadPriorityVerbose) {
4799 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4800 else tty->print_cr("We are not running with a T2 libthread\n");
4801 }
4802 return isT2;
4803 }
4806 void os::Solaris::libthread_init() {
4807 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4809 // Determine if we are running with the new T2 libthread
4810 os::Solaris::set_T2_libthread(isT2_libthread());
4812 lwp_priocntl_init();
4814 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4815 if(func == NULL) {
4816 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4817 // Guarantee that this VM is running on an new enough OS (5.6 or
4818 // later) that it will have a new enough libthread.so.
4819 guarantee(func != NULL, "libthread.so is too old.");
4820 }
4822 // Initialize the new libthread getstate API wrappers
4823 func = resolve_symbol("thr_getstate");
4824 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4826 func = resolve_symbol("thr_setstate");
4827 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4829 func = resolve_symbol("thr_setmutator");
4830 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4832 func = resolve_symbol("thr_suspend_mutator");
4833 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4835 func = resolve_symbol("thr_continue_mutator");
4836 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4838 int size;
4839 void (*handler_info_func)(address *, int *);
4840 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4841 handler_info_func(&handler_start, &size);
4842 handler_end = handler_start + size;
4843 }
4846 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4847 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4848 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4849 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4850 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4851 int os::Solaris::_mutex_scope = USYNC_THREAD;
4853 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4854 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4855 int_fnP_cond_tP os::Solaris::_cond_signal;
4856 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4857 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4858 int_fnP_cond_tP os::Solaris::_cond_destroy;
4859 int os::Solaris::_cond_scope = USYNC_THREAD;
4861 void os::Solaris::synchronization_init() {
4862 if(UseLWPSynchronization) {
4863 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4864 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4865 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4866 os::Solaris::set_mutex_init(lwp_mutex_init);
4867 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4868 os::Solaris::set_mutex_scope(USYNC_THREAD);
4870 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4871 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4872 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4873 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4874 os::Solaris::set_cond_init(lwp_cond_init);
4875 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4876 os::Solaris::set_cond_scope(USYNC_THREAD);
4877 }
4878 else {
4879 os::Solaris::set_mutex_scope(USYNC_THREAD);
4880 os::Solaris::set_cond_scope(USYNC_THREAD);
4882 if(UsePthreads) {
4883 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4884 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4885 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4886 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4887 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4889 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4890 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4891 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4892 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4893 os::Solaris::set_cond_init(pthread_cond_default_init);
4894 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4895 }
4896 else {
4897 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4898 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4899 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4900 os::Solaris::set_mutex_init(::mutex_init);
4901 os::Solaris::set_mutex_destroy(::mutex_destroy);
4903 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4904 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4905 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4906 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4907 os::Solaris::set_cond_init(::cond_init);
4908 os::Solaris::set_cond_destroy(::cond_destroy);
4909 }
4910 }
4911 }
4913 bool os::Solaris::liblgrp_init() {
4914 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4915 if (handle != NULL) {
4916 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4917 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4918 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4919 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4920 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4921 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4922 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4923 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4924 dlsym(handle, "lgrp_cookie_stale")));
4926 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4927 set_lgrp_cookie(c);
4928 return true;
4929 }
4930 return false;
4931 }
4933 void os::Solaris::misc_sym_init() {
4934 address func;
4936 // getisax
4937 func = resolve_symbol_lazy("getisax");
4938 if (func != NULL) {
4939 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4940 }
4942 // meminfo
4943 func = resolve_symbol_lazy("meminfo");
4944 if (func != NULL) {
4945 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4946 }
4947 }
4949 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4950 assert(_getisax != NULL, "_getisax not set");
4951 return _getisax(array, n);
4952 }
4954 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4955 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4956 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4958 void init_pset_getloadavg_ptr(void) {
4959 pset_getloadavg_ptr =
4960 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4961 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4962 warning("pset_getloadavg function not found");
4963 }
4964 }
4966 int os::Solaris::_dev_zero_fd = -1;
4968 // this is called _before_ the global arguments have been parsed
4969 void os::init(void) {
4970 _initial_pid = getpid();
4972 max_hrtime = first_hrtime = gethrtime();
4974 init_random(1234567);
4976 page_size = sysconf(_SC_PAGESIZE);
4977 if (page_size == -1)
4978 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4979 strerror(errno)));
4980 init_page_sizes((size_t) page_size);
4982 Solaris::initialize_system_info();
4984 // Initialize misc. symbols as soon as possible, so we can use them
4985 // if we need them.
4986 Solaris::misc_sym_init();
4988 int fd = ::open("/dev/zero", O_RDWR);
4989 if (fd < 0) {
4990 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4991 } else {
4992 Solaris::set_dev_zero_fd(fd);
4994 // Close on exec, child won't inherit.
4995 fcntl(fd, F_SETFD, FD_CLOEXEC);
4996 }
4998 clock_tics_per_sec = CLK_TCK;
5000 // check if dladdr1() exists; dladdr1 can provide more information than
5001 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
5002 // and is available on linker patches for 5.7 and 5.8.
5003 // libdl.so must have been loaded, this call is just an entry lookup
5004 void * hdl = dlopen("libdl.so", RTLD_NOW);
5005 if (hdl)
5006 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
5008 // (Solaris only) this switches to calls that actually do locking.
5009 ThreadCritical::initialize();
5011 main_thread = thr_self();
5013 // Constant minimum stack size allowed. It must be at least
5014 // the minimum of what the OS supports (thr_min_stack()), and
5015 // enough to allow the thread to get to user bytecode execution.
5016 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
5017 // If the pagesize of the VM is greater than 8K determine the appropriate
5018 // number of initial guard pages. The user can change this with the
5019 // command line arguments, if needed.
5020 if (vm_page_size() > 8*K) {
5021 StackYellowPages = 1;
5022 StackRedPages = 1;
5023 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
5024 }
5025 }
5027 // To install functions for atexit system call
5028 extern "C" {
5029 static void perfMemory_exit_helper() {
5030 perfMemory_exit();
5031 }
5032 }
5034 // this is called _after_ the global arguments have been parsed
5035 jint os::init_2(void) {
5036 // try to enable extended file IO ASAP, see 6431278
5037 os::Solaris::try_enable_extended_io();
5039 // Allocate a single page and mark it as readable for safepoint polling. Also
5040 // use this first mmap call to check support for MAP_ALIGN.
5041 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
5042 page_size,
5043 MAP_PRIVATE | MAP_ALIGN,
5044 PROT_READ);
5045 if (polling_page == NULL) {
5046 has_map_align = false;
5047 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
5048 PROT_READ);
5049 }
5051 os::set_polling_page(polling_page);
5053 #ifndef PRODUCT
5054 if( Verbose && PrintMiscellaneous )
5055 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
5056 #endif
5058 if (!UseMembar) {
5059 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
5060 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
5061 os::set_memory_serialize_page( mem_serialize_page );
5063 #ifndef PRODUCT
5064 if(Verbose && PrintMiscellaneous)
5065 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
5066 #endif
5067 }
5069 // Check minimum allowable stack size for thread creation and to initialize
5070 // the java system classes, including StackOverflowError - depends on page
5071 // size. Add a page for compiler2 recursion in main thread.
5072 // Add in 2*BytesPerWord times page size to account for VM stack during
5073 // class initialization depending on 32 or 64 bit VM.
5074 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5075 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5076 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5078 size_t threadStackSizeInBytes = ThreadStackSize * K;
5079 if (threadStackSizeInBytes != 0 &&
5080 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5081 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5082 os::Solaris::min_stack_allowed/K);
5083 return JNI_ERR;
5084 }
5086 // For 64kbps there will be a 64kb page size, which makes
5087 // the usable default stack size quite a bit less. Increase the
5088 // stack for 64kb (or any > than 8kb) pages, this increases
5089 // virtual memory fragmentation (since we're not creating the
5090 // stack on a power of 2 boundary. The real fix for this
5091 // should be to fix the guard page mechanism.
5093 if (vm_page_size() > 8*K) {
5094 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5095 ? threadStackSizeInBytes +
5096 ((StackYellowPages + StackRedPages) * vm_page_size())
5097 : 0;
5098 ThreadStackSize = threadStackSizeInBytes/K;
5099 }
5101 // Make the stack size a multiple of the page size so that
5102 // the yellow/red zones can be guarded.
5103 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5104 vm_page_size()));
5106 Solaris::libthread_init();
5108 if (UseNUMA) {
5109 if (!Solaris::liblgrp_init()) {
5110 UseNUMA = false;
5111 } else {
5112 size_t lgrp_limit = os::numa_get_groups_num();
5113 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5114 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5115 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5116 if (lgrp_num < 2) {
5117 // There's only one locality group, disable NUMA.
5118 UseNUMA = false;
5119 }
5120 }
5121 if (!UseNUMA && ForceNUMA) {
5122 UseNUMA = true;
5123 }
5124 }
5126 Solaris::signal_sets_init();
5127 Solaris::init_signal_mem();
5128 Solaris::install_signal_handlers();
5130 if (libjsigversion < JSIG_VERSION_1_4_1) {
5131 Maxlibjsigsigs = OLDMAXSIGNUM;
5132 }
5134 // initialize synchronization primitives to use either thread or
5135 // lwp synchronization (controlled by UseLWPSynchronization)
5136 Solaris::synchronization_init();
5138 if (MaxFDLimit) {
5139 // set the number of file descriptors to max. print out error
5140 // if getrlimit/setrlimit fails but continue regardless.
5141 struct rlimit nbr_files;
5142 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5143 if (status != 0) {
5144 if (PrintMiscellaneous && (Verbose || WizardMode))
5145 perror("os::init_2 getrlimit failed");
5146 } else {
5147 nbr_files.rlim_cur = nbr_files.rlim_max;
5148 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5149 if (status != 0) {
5150 if (PrintMiscellaneous && (Verbose || WizardMode))
5151 perror("os::init_2 setrlimit failed");
5152 }
5153 }
5154 }
5156 // Calculate theoretical max. size of Threads to guard gainst
5157 // artifical out-of-memory situations, where all available address-
5158 // space has been reserved by thread stacks. Default stack size is 1Mb.
5159 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5160 JavaThread::stack_size_at_create() : (1*K*K);
5161 assert(pre_thread_stack_size != 0, "Must have a stack");
5162 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5163 // we should start doing Virtual Memory banging. Currently when the threads will
5164 // have used all but 200Mb of space.
5165 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5166 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5168 // at-exit methods are called in the reverse order of their registration.
5169 // In Solaris 7 and earlier, atexit functions are called on return from
5170 // main or as a result of a call to exit(3C). There can be only 32 of
5171 // these functions registered and atexit() does not set errno. In Solaris
5172 // 8 and later, there is no limit to the number of functions registered
5173 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5174 // functions are called upon dlclose(3DL) in addition to return from main
5175 // and exit(3C).
5177 if (PerfAllowAtExitRegistration) {
5178 // only register atexit functions if PerfAllowAtExitRegistration is set.
5179 // atexit functions can be delayed until process exit time, which
5180 // can be problematic for embedded VM situations. Embedded VMs should
5181 // call DestroyJavaVM() to assure that VM resources are released.
5183 // note: perfMemory_exit_helper atexit function may be removed in
5184 // the future if the appropriate cleanup code can be added to the
5185 // VM_Exit VMOperation's doit method.
5186 if (atexit(perfMemory_exit_helper) != 0) {
5187 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5188 }
5189 }
5191 // Init pset_loadavg function pointer
5192 init_pset_getloadavg_ptr();
5194 return JNI_OK;
5195 }
5197 void os::init_3(void) {
5198 return;
5199 }
5201 // Mark the polling page as unreadable
5202 void os::make_polling_page_unreadable(void) {
5203 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5204 fatal("Could not disable polling page");
5205 };
5207 // Mark the polling page as readable
5208 void os::make_polling_page_readable(void) {
5209 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5210 fatal("Could not enable polling page");
5211 };
5213 // OS interface.
5215 bool os::check_heap(bool force) { return true; }
5217 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5218 static vsnprintf_t sol_vsnprintf = NULL;
5220 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5221 if (!sol_vsnprintf) {
5222 //search for the named symbol in the objects that were loaded after libjvm
5223 void* where = RTLD_NEXT;
5224 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5225 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5226 if (!sol_vsnprintf){
5227 //search for the named symbol in the objects that were loaded before libjvm
5228 where = RTLD_DEFAULT;
5229 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5230 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5231 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5232 }
5233 }
5234 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5235 }
5238 // Is a (classpath) directory empty?
5239 bool os::dir_is_empty(const char* path) {
5240 DIR *dir = NULL;
5241 struct dirent *ptr;
5243 dir = opendir(path);
5244 if (dir == NULL) return true;
5246 /* Scan the directory */
5247 bool result = true;
5248 char buf[sizeof(struct dirent) + MAX_PATH];
5249 struct dirent *dbuf = (struct dirent *) buf;
5250 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5251 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5252 result = false;
5253 }
5254 }
5255 closedir(dir);
5256 return result;
5257 }
5259 // This code originates from JDK's sysOpen and open64_w
5260 // from src/solaris/hpi/src/system_md.c
5262 #ifndef O_DELETE
5263 #define O_DELETE 0x10000
5264 #endif
5266 // Open a file. Unlink the file immediately after open returns
5267 // if the specified oflag has the O_DELETE flag set.
5268 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5270 int os::open(const char *path, int oflag, int mode) {
5271 if (strlen(path) > MAX_PATH - 1) {
5272 errno = ENAMETOOLONG;
5273 return -1;
5274 }
5275 int fd;
5276 int o_delete = (oflag & O_DELETE);
5277 oflag = oflag & ~O_DELETE;
5279 fd = ::open64(path, oflag, mode);
5280 if (fd == -1) return -1;
5282 //If the open succeeded, the file might still be a directory
5283 {
5284 struct stat64 buf64;
5285 int ret = ::fstat64(fd, &buf64);
5286 int st_mode = buf64.st_mode;
5288 if (ret != -1) {
5289 if ((st_mode & S_IFMT) == S_IFDIR) {
5290 errno = EISDIR;
5291 ::close(fd);
5292 return -1;
5293 }
5294 } else {
5295 ::close(fd);
5296 return -1;
5297 }
5298 }
5299 /*
5300 * 32-bit Solaris systems suffer from:
5301 *
5302 * - an historical default soft limit of 256 per-process file
5303 * descriptors that is too low for many Java programs.
5304 *
5305 * - a design flaw where file descriptors created using stdio
5306 * fopen must be less than 256, _even_ when the first limit above
5307 * has been raised. This can cause calls to fopen (but not calls to
5308 * open, for example) to fail mysteriously, perhaps in 3rd party
5309 * native code (although the JDK itself uses fopen). One can hardly
5310 * criticize them for using this most standard of all functions.
5311 *
5312 * We attempt to make everything work anyways by:
5313 *
5314 * - raising the soft limit on per-process file descriptors beyond
5315 * 256
5316 *
5317 * - As of Solaris 10u4, we can request that Solaris raise the 256
5318 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5319 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5320 *
5321 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5322 * workaround the bug by remapping non-stdio file descriptors below
5323 * 256 to ones beyond 256, which is done below.
5324 *
5325 * See:
5326 * 1085341: 32-bit stdio routines should support file descriptors >255
5327 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5328 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5329 * enable_extended_FILE_stdio() in VM initialisation
5330 * Giri Mandalika's blog
5331 * http://technopark02.blogspot.com/2005_05_01_archive.html
5332 */
5333 #ifndef _LP64
5334 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5335 int newfd = ::fcntl(fd, F_DUPFD, 256);
5336 if (newfd != -1) {
5337 ::close(fd);
5338 fd = newfd;
5339 }
5340 }
5341 #endif // 32-bit Solaris
5342 /*
5343 * All file descriptors that are opened in the JVM and not
5344 * specifically destined for a subprocess should have the
5345 * close-on-exec flag set. If we don't set it, then careless 3rd
5346 * party native code might fork and exec without closing all
5347 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5348 * UNIXProcess.c), and this in turn might:
5349 *
5350 * - cause end-of-file to fail to be detected on some file
5351 * descriptors, resulting in mysterious hangs, or
5352 *
5353 * - might cause an fopen in the subprocess to fail on a system
5354 * suffering from bug 1085341.
5355 *
5356 * (Yes, the default setting of the close-on-exec flag is a Unix
5357 * design flaw)
5358 *
5359 * See:
5360 * 1085341: 32-bit stdio routines should support file descriptors >255
5361 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5362 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5363 */
5364 #ifdef FD_CLOEXEC
5365 {
5366 int flags = ::fcntl(fd, F_GETFD);
5367 if (flags != -1)
5368 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5369 }
5370 #endif
5372 if (o_delete != 0) {
5373 ::unlink(path);
5374 }
5375 return fd;
5376 }
5378 // create binary file, rewriting existing file if required
5379 int os::create_binary_file(const char* path, bool rewrite_existing) {
5380 int oflags = O_WRONLY | O_CREAT;
5381 if (!rewrite_existing) {
5382 oflags |= O_EXCL;
5383 }
5384 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5385 }
5387 // return current position of file pointer
5388 jlong os::current_file_offset(int fd) {
5389 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5390 }
5392 // move file pointer to the specified offset
5393 jlong os::seek_to_file_offset(int fd, jlong offset) {
5394 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5395 }
5397 jlong os::lseek(int fd, jlong offset, int whence) {
5398 return (jlong) ::lseek64(fd, offset, whence);
5399 }
5401 char * os::native_path(char *path) {
5402 return path;
5403 }
5405 int os::ftruncate(int fd, jlong length) {
5406 return ::ftruncate64(fd, length);
5407 }
5409 int os::fsync(int fd) {
5410 RESTARTABLE_RETURN_INT(::fsync(fd));
5411 }
5413 int os::available(int fd, jlong *bytes) {
5414 jlong cur, end;
5415 int mode;
5416 struct stat64 buf64;
5418 if (::fstat64(fd, &buf64) >= 0) {
5419 mode = buf64.st_mode;
5420 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5421 /*
5422 * XXX: is the following call interruptible? If so, this might
5423 * need to go through the INTERRUPT_IO() wrapper as for other
5424 * blocking, interruptible calls in this file.
5425 */
5426 int n,ioctl_return;
5428 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5429 if (ioctl_return>= 0) {
5430 *bytes = n;
5431 return 1;
5432 }
5433 }
5434 }
5435 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5436 return 0;
5437 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5438 return 0;
5439 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5440 return 0;
5441 }
5442 *bytes = end - cur;
5443 return 1;
5444 }
5446 // Map a block of memory.
5447 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5448 char *addr, size_t bytes, bool read_only,
5449 bool allow_exec) {
5450 int prot;
5451 int flags;
5453 if (read_only) {
5454 prot = PROT_READ;
5455 flags = MAP_SHARED;
5456 } else {
5457 prot = PROT_READ | PROT_WRITE;
5458 flags = MAP_PRIVATE;
5459 }
5461 if (allow_exec) {
5462 prot |= PROT_EXEC;
5463 }
5465 if (addr != NULL) {
5466 flags |= MAP_FIXED;
5467 }
5469 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5470 fd, file_offset);
5471 if (mapped_address == MAP_FAILED) {
5472 return NULL;
5473 }
5474 return mapped_address;
5475 }
5478 // Remap a block of memory.
5479 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5480 char *addr, size_t bytes, bool read_only,
5481 bool allow_exec) {
5482 // same as map_memory() on this OS
5483 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5484 allow_exec);
5485 }
5488 // Unmap a block of memory.
5489 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5490 return munmap(addr, bytes) == 0;
5491 }
5493 void os::pause() {
5494 char filename[MAX_PATH];
5495 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5496 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5497 } else {
5498 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5499 }
5501 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5502 if (fd != -1) {
5503 struct stat buf;
5504 ::close(fd);
5505 while (::stat(filename, &buf) == 0) {
5506 (void)::poll(NULL, 0, 100);
5507 }
5508 } else {
5509 jio_fprintf(stderr,
5510 "Could not open pause file '%s', continuing immediately.\n", filename);
5511 }
5512 }
5514 #ifndef PRODUCT
5515 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5516 // Turn this on if you need to trace synch operations.
5517 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5518 // and call record_synch_enable and record_synch_disable
5519 // around the computation of interest.
5521 void record_synch(char* name, bool returning); // defined below
5523 class RecordSynch {
5524 char* _name;
5525 public:
5526 RecordSynch(char* name) :_name(name)
5527 { record_synch(_name, false); }
5528 ~RecordSynch() { record_synch(_name, true); }
5529 };
5531 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5532 extern "C" ret name params { \
5533 typedef ret name##_t params; \
5534 static name##_t* implem = NULL; \
5535 static int callcount = 0; \
5536 if (implem == NULL) { \
5537 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5538 if (implem == NULL) fatal(dlerror()); \
5539 } \
5540 ++callcount; \
5541 RecordSynch _rs(#name); \
5542 inner; \
5543 return implem args; \
5544 }
5545 // in dbx, examine callcounts this way:
5546 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5548 #define CHECK_POINTER_OK(p) \
5549 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5550 #define CHECK_MU \
5551 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5552 #define CHECK_CV \
5553 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5554 #define CHECK_P(p) \
5555 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5557 #define CHECK_MUTEX(mutex_op) \
5558 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5560 CHECK_MUTEX( mutex_lock)
5561 CHECK_MUTEX( _mutex_lock)
5562 CHECK_MUTEX( mutex_unlock)
5563 CHECK_MUTEX(_mutex_unlock)
5564 CHECK_MUTEX( mutex_trylock)
5565 CHECK_MUTEX(_mutex_trylock)
5567 #define CHECK_COND(cond_op) \
5568 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5570 CHECK_COND( cond_wait);
5571 CHECK_COND(_cond_wait);
5572 CHECK_COND(_cond_wait_cancel);
5574 #define CHECK_COND2(cond_op) \
5575 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5577 CHECK_COND2( cond_timedwait);
5578 CHECK_COND2(_cond_timedwait);
5579 CHECK_COND2(_cond_timedwait_cancel);
5581 // do the _lwp_* versions too
5582 #define mutex_t lwp_mutex_t
5583 #define cond_t lwp_cond_t
5584 CHECK_MUTEX( _lwp_mutex_lock)
5585 CHECK_MUTEX( _lwp_mutex_unlock)
5586 CHECK_MUTEX( _lwp_mutex_trylock)
5587 CHECK_MUTEX( __lwp_mutex_lock)
5588 CHECK_MUTEX( __lwp_mutex_unlock)
5589 CHECK_MUTEX( __lwp_mutex_trylock)
5590 CHECK_MUTEX(___lwp_mutex_lock)
5591 CHECK_MUTEX(___lwp_mutex_unlock)
5593 CHECK_COND( _lwp_cond_wait);
5594 CHECK_COND( __lwp_cond_wait);
5595 CHECK_COND(___lwp_cond_wait);
5597 CHECK_COND2( _lwp_cond_timedwait);
5598 CHECK_COND2( __lwp_cond_timedwait);
5599 #undef mutex_t
5600 #undef cond_t
5602 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5603 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5604 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5605 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5606 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5607 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5608 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5609 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5612 // recording machinery:
5614 enum { RECORD_SYNCH_LIMIT = 200 };
5615 char* record_synch_name[RECORD_SYNCH_LIMIT];
5616 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5617 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5618 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5619 int record_synch_count = 0;
5620 bool record_synch_enabled = false;
5622 // in dbx, examine recorded data this way:
5623 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5625 void record_synch(char* name, bool returning) {
5626 if (record_synch_enabled) {
5627 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5628 record_synch_name[record_synch_count] = name;
5629 record_synch_returning[record_synch_count] = returning;
5630 record_synch_thread[record_synch_count] = thr_self();
5631 record_synch_arg0ptr[record_synch_count] = &name;
5632 record_synch_count++;
5633 }
5634 // put more checking code here:
5635 // ...
5636 }
5637 }
5639 void record_synch_enable() {
5640 // start collecting trace data, if not already doing so
5641 if (!record_synch_enabled) record_synch_count = 0;
5642 record_synch_enabled = true;
5643 }
5645 void record_synch_disable() {
5646 // stop collecting trace data
5647 record_synch_enabled = false;
5648 }
5650 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5651 #endif // PRODUCT
5653 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5654 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5655 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5658 // JVMTI & JVM monitoring and management support
5659 // The thread_cpu_time() and current_thread_cpu_time() are only
5660 // supported if is_thread_cpu_time_supported() returns true.
5661 // They are not supported on Solaris T1.
5663 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5664 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5665 // of a thread.
5666 //
5667 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5668 // returns the fast estimate available on the platform.
5670 // hrtime_t gethrvtime() return value includes
5671 // user time but does not include system time
5672 jlong os::current_thread_cpu_time() {
5673 return (jlong) gethrvtime();
5674 }
5676 jlong os::thread_cpu_time(Thread *thread) {
5677 // return user level CPU time only to be consistent with
5678 // what current_thread_cpu_time returns.
5679 // thread_cpu_time_info() must be changed if this changes
5680 return os::thread_cpu_time(thread, false /* user time only */);
5681 }
5683 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5684 if (user_sys_cpu_time) {
5685 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5686 } else {
5687 return os::current_thread_cpu_time();
5688 }
5689 }
5691 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5692 char proc_name[64];
5693 int count;
5694 prusage_t prusage;
5695 jlong lwp_time;
5696 int fd;
5698 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5699 getpid(),
5700 thread->osthread()->lwp_id());
5701 fd = ::open(proc_name, O_RDONLY);
5702 if ( fd == -1 ) return -1;
5704 do {
5705 count = ::pread(fd,
5706 (void *)&prusage.pr_utime,
5707 thr_time_size,
5708 thr_time_off);
5709 } while (count < 0 && errno == EINTR);
5710 ::close(fd);
5711 if ( count < 0 ) return -1;
5713 if (user_sys_cpu_time) {
5714 // user + system CPU time
5715 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5716 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5717 (jlong)prusage.pr_stime.tv_nsec +
5718 (jlong)prusage.pr_utime.tv_nsec;
5719 } else {
5720 // user level CPU time only
5721 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5722 (jlong)prusage.pr_utime.tv_nsec;
5723 }
5725 return(lwp_time);
5726 }
5728 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5729 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5730 info_ptr->may_skip_backward = false; // elapsed time not wall time
5731 info_ptr->may_skip_forward = false; // elapsed time not wall time
5732 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5733 }
5735 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5736 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5737 info_ptr->may_skip_backward = false; // elapsed time not wall time
5738 info_ptr->may_skip_forward = false; // elapsed time not wall time
5739 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5740 }
5742 bool os::is_thread_cpu_time_supported() {
5743 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5744 return true;
5745 } else {
5746 return false;
5747 }
5748 }
5750 // System loadavg support. Returns -1 if load average cannot be obtained.
5751 // Return the load average for our processor set if the primitive exists
5752 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5753 int os::loadavg(double loadavg[], int nelem) {
5754 if (pset_getloadavg_ptr != NULL) {
5755 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5756 } else {
5757 return ::getloadavg(loadavg, nelem);
5758 }
5759 }
5761 //---------------------------------------------------------------------------------
5763 bool os::find(address addr, outputStream* st) {
5764 Dl_info dlinfo;
5765 memset(&dlinfo, 0, sizeof(dlinfo));
5766 if (dladdr(addr, &dlinfo) != 0) {
5767 st->print(PTR_FORMAT ": ", addr);
5768 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5769 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5770 } else if (dlinfo.dli_fbase != NULL)
5771 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5772 else
5773 st->print("<absolute address>");
5774 if (dlinfo.dli_fname != NULL) {
5775 st->print(" in %s", dlinfo.dli_fname);
5776 }
5777 if (dlinfo.dli_fbase != NULL) {
5778 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5779 }
5780 st->cr();
5782 if (Verbose) {
5783 // decode some bytes around the PC
5784 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5785 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5786 address lowest = (address) dlinfo.dli_sname;
5787 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5788 if (begin < lowest) begin = lowest;
5789 Dl_info dlinfo2;
5790 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5791 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5792 end = (address) dlinfo2.dli_saddr;
5793 Disassembler::decode(begin, end, st);
5794 }
5795 return true;
5796 }
5797 return false;
5798 }
5800 // Following function has been added to support HotSparc's libjvm.so running
5801 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5802 // src/solaris/hpi/native_threads in the EVM codebase.
5803 //
5804 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5805 // libraries and should thus be removed. We will leave it behind for a while
5806 // until we no longer want to able to run on top of 1.3.0 Solaris production
5807 // JDK. See 4341971.
5809 #define STACK_SLACK 0x800
5811 extern "C" {
5812 intptr_t sysThreadAvailableStackWithSlack() {
5813 stack_t st;
5814 intptr_t retval, stack_top;
5815 retval = thr_stksegment(&st);
5816 assert(retval == 0, "incorrect return value from thr_stksegment");
5817 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5818 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5819 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5820 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5821 }
5822 }
5824 // ObjectMonitor park-unpark infrastructure ...
5825 //
5826 // We implement Solaris and Linux PlatformEvents with the
5827 // obvious condvar-mutex-flag triple.
5828 // Another alternative that works quite well is pipes:
5829 // Each PlatformEvent consists of a pipe-pair.
5830 // The thread associated with the PlatformEvent
5831 // calls park(), which reads from the input end of the pipe.
5832 // Unpark() writes into the other end of the pipe.
5833 // The write-side of the pipe must be set NDELAY.
5834 // Unfortunately pipes consume a large # of handles.
5835 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5836 // Using pipes for the 1st few threads might be workable, however.
5837 //
5838 // park() is permitted to return spuriously.
5839 // Callers of park() should wrap the call to park() in
5840 // an appropriate loop. A litmus test for the correct
5841 // usage of park is the following: if park() were modified
5842 // to immediately return 0 your code should still work,
5843 // albeit degenerating to a spin loop.
5844 //
5845 // An interesting optimization for park() is to use a trylock()
5846 // to attempt to acquire the mutex. If the trylock() fails
5847 // then we know that a concurrent unpark() operation is in-progress.
5848 // in that case the park() code could simply set _count to 0
5849 // and return immediately. The subsequent park() operation *might*
5850 // return immediately. That's harmless as the caller of park() is
5851 // expected to loop. By using trylock() we will have avoided a
5852 // avoided a context switch caused by contention on the per-thread mutex.
5853 //
5854 // TODO-FIXME:
5855 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5856 // objectmonitor implementation.
5857 // 2. Collapse the JSR166 parker event, and the
5858 // objectmonitor ParkEvent into a single "Event" construct.
5859 // 3. In park() and unpark() add:
5860 // assert (Thread::current() == AssociatedWith).
5861 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5862 // 1-out-of-N park() operations will return immediately.
5863 //
5864 // _Event transitions in park()
5865 // -1 => -1 : illegal
5866 // 1 => 0 : pass - return immediately
5867 // 0 => -1 : block
5868 //
5869 // _Event serves as a restricted-range semaphore.
5870 //
5871 // Another possible encoding of _Event would be with
5872 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5873 //
5874 // TODO-FIXME: add DTRACE probes for:
5875 // 1. Tx parks
5876 // 2. Ty unparks Tx
5877 // 3. Tx resumes from park
5880 // value determined through experimentation
5881 #define ROUNDINGFIX 11
5883 // utility to compute the abstime argument to timedwait.
5884 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5886 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5887 // millis is the relative timeout time
5888 // abstime will be the absolute timeout time
5889 if (millis < 0) millis = 0;
5890 struct timeval now;
5891 int status = gettimeofday(&now, NULL);
5892 assert(status == 0, "gettimeofday");
5893 jlong seconds = millis / 1000;
5894 jlong max_wait_period;
5896 if (UseLWPSynchronization) {
5897 // forward port of fix for 4275818 (not sleeping long enough)
5898 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5899 // _lwp_cond_timedwait() used a round_down algorithm rather
5900 // than a round_up. For millis less than our roundfactor
5901 // it rounded down to 0 which doesn't meet the spec.
5902 // For millis > roundfactor we may return a bit sooner, but
5903 // since we can not accurately identify the patch level and
5904 // this has already been fixed in Solaris 9 and 8 we will
5905 // leave it alone rather than always rounding down.
5907 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5908 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5909 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5910 max_wait_period = 21000000;
5911 } else {
5912 max_wait_period = 50000000;
5913 }
5914 millis %= 1000;
5915 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5916 seconds = max_wait_period;
5917 }
5918 abstime->tv_sec = now.tv_sec + seconds;
5919 long usec = now.tv_usec + millis * 1000;
5920 if (usec >= 1000000) {
5921 abstime->tv_sec += 1;
5922 usec -= 1000000;
5923 }
5924 abstime->tv_nsec = usec * 1000;
5925 return abstime;
5926 }
5928 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5929 // Conceptually TryPark() should be equivalent to park(0).
5931 int os::PlatformEvent::TryPark() {
5932 for (;;) {
5933 const int v = _Event ;
5934 guarantee ((v == 0) || (v == 1), "invariant") ;
5935 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5936 }
5937 }
5939 void os::PlatformEvent::park() { // AKA: down()
5940 // Invariant: Only the thread associated with the Event/PlatformEvent
5941 // may call park().
5942 int v ;
5943 for (;;) {
5944 v = _Event ;
5945 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5946 }
5947 guarantee (v >= 0, "invariant") ;
5948 if (v == 0) {
5949 // Do this the hard way by blocking ...
5950 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5951 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5952 // Only for SPARC >= V8PlusA
5953 #if defined(__sparc) && defined(COMPILER2)
5954 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5955 #endif
5956 int status = os::Solaris::mutex_lock(_mutex);
5957 assert_status(status == 0, status, "mutex_lock");
5958 guarantee (_nParked == 0, "invariant") ;
5959 ++ _nParked ;
5960 while (_Event < 0) {
5961 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5962 // Treat this the same as if the wait was interrupted
5963 // With usr/lib/lwp going to kernel, always handle ETIME
5964 status = os::Solaris::cond_wait(_cond, _mutex);
5965 if (status == ETIME) status = EINTR ;
5966 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5967 }
5968 -- _nParked ;
5969 _Event = 0 ;
5970 status = os::Solaris::mutex_unlock(_mutex);
5971 assert_status(status == 0, status, "mutex_unlock");
5972 // Paranoia to ensure our locked and lock-free paths interact
5973 // correctly with each other.
5974 OrderAccess::fence();
5975 }
5976 }
5978 int os::PlatformEvent::park(jlong millis) {
5979 guarantee (_nParked == 0, "invariant") ;
5980 int v ;
5981 for (;;) {
5982 v = _Event ;
5983 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5984 }
5985 guarantee (v >= 0, "invariant") ;
5986 if (v != 0) return OS_OK ;
5988 int ret = OS_TIMEOUT;
5989 timestruc_t abst;
5990 compute_abstime (&abst, millis);
5992 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5993 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5994 // Only for SPARC >= V8PlusA
5995 #if defined(__sparc) && defined(COMPILER2)
5996 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5997 #endif
5998 int status = os::Solaris::mutex_lock(_mutex);
5999 assert_status(status == 0, status, "mutex_lock");
6000 guarantee (_nParked == 0, "invariant") ;
6001 ++ _nParked ;
6002 while (_Event < 0) {
6003 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
6004 assert_status(status == 0 || status == EINTR ||
6005 status == ETIME || status == ETIMEDOUT,
6006 status, "cond_timedwait");
6007 if (!FilterSpuriousWakeups) break ; // previous semantics
6008 if (status == ETIME || status == ETIMEDOUT) break ;
6009 // We consume and ignore EINTR and spurious wakeups.
6010 }
6011 -- _nParked ;
6012 if (_Event >= 0) ret = OS_OK ;
6013 _Event = 0 ;
6014 status = os::Solaris::mutex_unlock(_mutex);
6015 assert_status(status == 0, status, "mutex_unlock");
6016 // Paranoia to ensure our locked and lock-free paths interact
6017 // correctly with each other.
6018 OrderAccess::fence();
6019 return ret;
6020 }
6022 void os::PlatformEvent::unpark() {
6023 // Transitions for _Event:
6024 // 0 :=> 1
6025 // 1 :=> 1
6026 // -1 :=> either 0 or 1; must signal target thread
6027 // That is, we can safely transition _Event from -1 to either
6028 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
6029 // unpark() calls.
6030 // See also: "Semaphores in Plan 9" by Mullender & Cox
6031 //
6032 // Note: Forcing a transition from "-1" to "1" on an unpark() means
6033 // that it will take two back-to-back park() calls for the owning
6034 // thread to block. This has the benefit of forcing a spurious return
6035 // from the first park() call after an unpark() call which will help
6036 // shake out uses of park() and unpark() without condition variables.
6038 if (Atomic::xchg(1, &_Event) >= 0) return;
6040 // If the thread associated with the event was parked, wake it.
6041 // Wait for the thread assoc with the PlatformEvent to vacate.
6042 int status = os::Solaris::mutex_lock(_mutex);
6043 assert_status(status == 0, status, "mutex_lock");
6044 int AnyWaiters = _nParked;
6045 status = os::Solaris::mutex_unlock(_mutex);
6046 assert_status(status == 0, status, "mutex_unlock");
6047 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
6048 if (AnyWaiters != 0) {
6049 // We intentional signal *after* dropping the lock
6050 // to avoid a common class of futile wakeups.
6051 status = os::Solaris::cond_signal(_cond);
6052 assert_status(status == 0, status, "cond_signal");
6053 }
6054 }
6056 // JSR166
6057 // -------------------------------------------------------
6059 /*
6060 * The solaris and linux implementations of park/unpark are fairly
6061 * conservative for now, but can be improved. They currently use a
6062 * mutex/condvar pair, plus _counter.
6063 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6064 * sets count to 1 and signals condvar. Only one thread ever waits
6065 * on the condvar. Contention seen when trying to park implies that someone
6066 * is unparking you, so don't wait. And spurious returns are fine, so there
6067 * is no need to track notifications.
6068 */
6070 #define MAX_SECS 100000000
6071 /*
6072 * This code is common to linux and solaris and will be moved to a
6073 * common place in dolphin.
6074 *
6075 * The passed in time value is either a relative time in nanoseconds
6076 * or an absolute time in milliseconds. Either way it has to be unpacked
6077 * into suitable seconds and nanoseconds components and stored in the
6078 * given timespec structure.
6079 * Given time is a 64-bit value and the time_t used in the timespec is only
6080 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6081 * overflow if times way in the future are given. Further on Solaris versions
6082 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6083 * number of seconds, in abstime, is less than current_time + 100,000,000.
6084 * As it will be 28 years before "now + 100000000" will overflow we can
6085 * ignore overflow and just impose a hard-limit on seconds using the value
6086 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6087 * years from "now".
6088 */
6089 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6090 assert (time > 0, "convertTime");
6092 struct timeval now;
6093 int status = gettimeofday(&now, NULL);
6094 assert(status == 0, "gettimeofday");
6096 time_t max_secs = now.tv_sec + MAX_SECS;
6098 if (isAbsolute) {
6099 jlong secs = time / 1000;
6100 if (secs > max_secs) {
6101 absTime->tv_sec = max_secs;
6102 }
6103 else {
6104 absTime->tv_sec = secs;
6105 }
6106 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6107 }
6108 else {
6109 jlong secs = time / NANOSECS_PER_SEC;
6110 if (secs >= MAX_SECS) {
6111 absTime->tv_sec = max_secs;
6112 absTime->tv_nsec = 0;
6113 }
6114 else {
6115 absTime->tv_sec = now.tv_sec + secs;
6116 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6117 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6118 absTime->tv_nsec -= NANOSECS_PER_SEC;
6119 ++absTime->tv_sec; // note: this must be <= max_secs
6120 }
6121 }
6122 }
6123 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6124 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6125 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6126 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6127 }
6129 void Parker::park(bool isAbsolute, jlong time) {
6130 // Ideally we'd do something useful while spinning, such
6131 // as calling unpackTime().
6133 // Optional fast-path check:
6134 // Return immediately if a permit is available.
6135 // We depend on Atomic::xchg() having full barrier semantics
6136 // since we are doing a lock-free update to _counter.
6137 if (Atomic::xchg(0, &_counter) > 0) return;
6139 // Optional fast-exit: Check interrupt before trying to wait
6140 Thread* thread = Thread::current();
6141 assert(thread->is_Java_thread(), "Must be JavaThread");
6142 JavaThread *jt = (JavaThread *)thread;
6143 if (Thread::is_interrupted(thread, false)) {
6144 return;
6145 }
6147 // First, demultiplex/decode time arguments
6148 timespec absTime;
6149 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6150 return;
6151 }
6152 if (time > 0) {
6153 // Warning: this code might be exposed to the old Solaris time
6154 // round-down bugs. Grep "roundingFix" for details.
6155 unpackTime(&absTime, isAbsolute, time);
6156 }
6158 // Enter safepoint region
6159 // Beware of deadlocks such as 6317397.
6160 // The per-thread Parker:: _mutex is a classic leaf-lock.
6161 // In particular a thread must never block on the Threads_lock while
6162 // holding the Parker:: mutex. If safepoints are pending both the
6163 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6164 ThreadBlockInVM tbivm(jt);
6166 // Don't wait if cannot get lock since interference arises from
6167 // unblocking. Also. check interrupt before trying wait
6168 if (Thread::is_interrupted(thread, false) ||
6169 os::Solaris::mutex_trylock(_mutex) != 0) {
6170 return;
6171 }
6173 int status ;
6175 if (_counter > 0) { // no wait needed
6176 _counter = 0;
6177 status = os::Solaris::mutex_unlock(_mutex);
6178 assert (status == 0, "invariant") ;
6179 // Paranoia to ensure our locked and lock-free paths interact
6180 // correctly with each other and Java-level accesses.
6181 OrderAccess::fence();
6182 return;
6183 }
6185 #ifdef ASSERT
6186 // Don't catch signals while blocked; let the running threads have the signals.
6187 // (This allows a debugger to break into the running thread.)
6188 sigset_t oldsigs;
6189 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6190 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6191 #endif
6193 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6194 jt->set_suspend_equivalent();
6195 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6197 // Do this the hard way by blocking ...
6198 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6199 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6200 // Only for SPARC >= V8PlusA
6201 #if defined(__sparc) && defined(COMPILER2)
6202 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6203 #endif
6205 if (time == 0) {
6206 status = os::Solaris::cond_wait (_cond, _mutex) ;
6207 } else {
6208 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6209 }
6210 // Note that an untimed cond_wait() can sometimes return ETIME on older
6211 // versions of the Solaris.
6212 assert_status(status == 0 || status == EINTR ||
6213 status == ETIME || status == ETIMEDOUT,
6214 status, "cond_timedwait");
6216 #ifdef ASSERT
6217 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6218 #endif
6219 _counter = 0 ;
6220 status = os::Solaris::mutex_unlock(_mutex);
6221 assert_status(status == 0, status, "mutex_unlock") ;
6222 // Paranoia to ensure our locked and lock-free paths interact
6223 // correctly with each other and Java-level accesses.
6224 OrderAccess::fence();
6226 // If externally suspended while waiting, re-suspend
6227 if (jt->handle_special_suspend_equivalent_condition()) {
6228 jt->java_suspend_self();
6229 }
6230 }
6232 void Parker::unpark() {
6233 int s, status ;
6234 status = os::Solaris::mutex_lock (_mutex) ;
6235 assert (status == 0, "invariant") ;
6236 s = _counter;
6237 _counter = 1;
6238 status = os::Solaris::mutex_unlock (_mutex) ;
6239 assert (status == 0, "invariant") ;
6241 if (s < 1) {
6242 status = os::Solaris::cond_signal (_cond) ;
6243 assert (status == 0, "invariant") ;
6244 }
6245 }
6247 extern char** environ;
6249 // Run the specified command in a separate process. Return its exit value,
6250 // or -1 on failure (e.g. can't fork a new process).
6251 // Unlike system(), this function can be called from signal handler. It
6252 // doesn't block SIGINT et al.
6253 int os::fork_and_exec(char* cmd) {
6254 char * argv[4];
6255 argv[0] = (char *)"sh";
6256 argv[1] = (char *)"-c";
6257 argv[2] = cmd;
6258 argv[3] = NULL;
6260 // fork is async-safe, fork1 is not so can't use in signal handler
6261 pid_t pid;
6262 Thread* t = ThreadLocalStorage::get_thread_slow();
6263 if (t != NULL && t->is_inside_signal_handler()) {
6264 pid = fork();
6265 } else {
6266 pid = fork1();
6267 }
6269 if (pid < 0) {
6270 // fork failed
6271 warning("fork failed: %s", strerror(errno));
6272 return -1;
6274 } else if (pid == 0) {
6275 // child process
6277 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6278 execve("/usr/bin/sh", argv, environ);
6280 // execve failed
6281 _exit(-1);
6283 } else {
6284 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6285 // care about the actual exit code, for now.
6287 int status;
6289 // Wait for the child process to exit. This returns immediately if
6290 // the child has already exited. */
6291 while (waitpid(pid, &status, 0) < 0) {
6292 switch (errno) {
6293 case ECHILD: return 0;
6294 case EINTR: break;
6295 default: return -1;
6296 }
6297 }
6299 if (WIFEXITED(status)) {
6300 // The child exited normally; get its exit code.
6301 return WEXITSTATUS(status);
6302 } else if (WIFSIGNALED(status)) {
6303 // The child exited because of a signal
6304 // The best value to return is 0x80 + signal number,
6305 // because that is what all Unix shells do, and because
6306 // it allows callers to distinguish between process exit and
6307 // process death by signal.
6308 return 0x80 + WTERMSIG(status);
6309 } else {
6310 // Unknown exit code; pass it through
6311 return status;
6312 }
6313 }
6314 }
6316 // is_headless_jre()
6317 //
6318 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6319 // in order to report if we are running in a headless jre
6320 //
6321 // Since JDK8 xawt/libmawt.so was moved into the same directory
6322 // as libawt.so, and renamed libawt_xawt.so
6323 //
6324 bool os::is_headless_jre() {
6325 struct stat statbuf;
6326 char buf[MAXPATHLEN];
6327 char libmawtpath[MAXPATHLEN];
6328 const char *xawtstr = "/xawt/libmawt.so";
6329 const char *new_xawtstr = "/libawt_xawt.so";
6330 char *p;
6332 // Get path to libjvm.so
6333 os::jvm_path(buf, sizeof(buf));
6335 // Get rid of libjvm.so
6336 p = strrchr(buf, '/');
6337 if (p == NULL) return false;
6338 else *p = '\0';
6340 // Get rid of client or server
6341 p = strrchr(buf, '/');
6342 if (p == NULL) return false;
6343 else *p = '\0';
6345 // check xawt/libmawt.so
6346 strcpy(libmawtpath, buf);
6347 strcat(libmawtpath, xawtstr);
6348 if (::stat(libmawtpath, &statbuf) == 0) return false;
6350 // check libawt_xawt.so
6351 strcpy(libmawtpath, buf);
6352 strcat(libmawtpath, new_xawtstr);
6353 if (::stat(libmawtpath, &statbuf) == 0) return false;
6355 return true;
6356 }
6358 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6359 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6360 }
6362 int os::close(int fd) {
6363 return ::close(fd);
6364 }
6366 int os::socket_close(int fd) {
6367 return ::close(fd);
6368 }
6370 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6371 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6372 }
6374 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6375 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6376 }
6378 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6379 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6380 }
6382 // As both poll and select can be interrupted by signals, we have to be
6383 // prepared to restart the system call after updating the timeout, unless
6384 // a poll() is done with timeout == -1, in which case we repeat with this
6385 // "wait forever" value.
6387 int os::timeout(int fd, long timeout) {
6388 int res;
6389 struct timeval t;
6390 julong prevtime, newtime;
6391 static const char* aNull = 0;
6392 struct pollfd pfd;
6393 pfd.fd = fd;
6394 pfd.events = POLLIN;
6396 gettimeofday(&t, &aNull);
6397 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6399 for(;;) {
6400 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6401 if(res == OS_ERR && errno == EINTR) {
6402 if(timeout != -1) {
6403 gettimeofday(&t, &aNull);
6404 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6405 timeout -= newtime - prevtime;
6406 if(timeout <= 0)
6407 return OS_OK;
6408 prevtime = newtime;
6409 }
6410 } else return res;
6411 }
6412 }
6414 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6415 int _result;
6416 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6417 os::Solaris::clear_interrupted);
6419 // Depending on when thread interruption is reset, _result could be
6420 // one of two values when errno == EINTR
6422 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6423 && (errno == EINTR)) {
6424 /* restarting a connect() changes its errno semantics */
6425 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6426 os::Solaris::clear_interrupted);
6427 /* undo these changes */
6428 if (_result == OS_ERR) {
6429 if (errno == EALREADY) {
6430 errno = EINPROGRESS; /* fall through */
6431 } else if (errno == EISCONN) {
6432 errno = 0;
6433 return OS_OK;
6434 }
6435 }
6436 }
6437 return _result;
6438 }
6440 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6441 if (fd < 0) {
6442 return OS_ERR;
6443 }
6444 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6445 os::Solaris::clear_interrupted);
6446 }
6448 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6449 sockaddr* from, socklen_t* fromlen) {
6450 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6451 os::Solaris::clear_interrupted);
6452 }
6454 int os::sendto(int fd, char* buf, size_t len, uint flags,
6455 struct sockaddr* to, socklen_t tolen) {
6456 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6457 os::Solaris::clear_interrupted);
6458 }
6460 int os::socket_available(int fd, jint *pbytes) {
6461 if (fd < 0) {
6462 return OS_OK;
6463 }
6464 int ret;
6465 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6466 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6467 // is expected to return 0 on failure and 1 on success to the jdk.
6468 return (ret == OS_ERR) ? 0 : 1;
6469 }
6471 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6472 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6473 os::Solaris::clear_interrupted);
6474 }
6476 // Get the default path to the core file
6477 // Returns the length of the string
6478 int os::get_core_path(char* buffer, size_t bufferSize) {
6479 const char* p = get_current_directory(buffer, bufferSize);
6481 if (p == NULL) {
6482 assert(p != NULL, "failed to get current directory");
6483 return 0;
6484 }
6486 return strlen(buffer);
6487 }
6489 #ifndef PRODUCT
6490 void TestReserveMemorySpecial_test() {
6491 // No tests available for this platform
6492 }
6493 #endif