Thu, 13 Mar 2014 14:57:01 -0700
Merge
1 /*
2 * Copyright (c) 1997, 2013, 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/osThread.hpp"
52 #include "runtime/perfMemory.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/statSampler.hpp"
55 #include "runtime/stubRoutines.hpp"
56 #include "runtime/thread.inline.hpp"
57 #include "runtime/threadCritical.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/attachListener.hpp"
60 #include "services/memTracker.hpp"
61 #include "services/runtimeService.hpp"
62 #include "utilities/decoder.hpp"
63 #include "utilities/defaultStream.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/growableArray.hpp"
66 #include "utilities/vmError.hpp"
68 // put OS-includes here
69 # include <dlfcn.h>
70 # include <errno.h>
71 # include <exception>
72 # include <link.h>
73 # include <poll.h>
74 # include <pthread.h>
75 # include <pwd.h>
76 # include <schedctl.h>
77 # include <setjmp.h>
78 # include <signal.h>
79 # include <stdio.h>
80 # include <alloca.h>
81 # include <sys/filio.h>
82 # include <sys/ipc.h>
83 # include <sys/lwp.h>
84 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
85 # include <sys/mman.h>
86 # include <sys/processor.h>
87 # include <sys/procset.h>
88 # include <sys/pset.h>
89 # include <sys/resource.h>
90 # include <sys/shm.h>
91 # include <sys/socket.h>
92 # include <sys/stat.h>
93 # include <sys/systeminfo.h>
94 # include <sys/time.h>
95 # include <sys/times.h>
96 # include <sys/types.h>
97 # include <sys/wait.h>
98 # include <sys/utsname.h>
99 # include <thread.h>
100 # include <unistd.h>
101 # include <sys/priocntl.h>
102 # include <sys/rtpriocntl.h>
103 # include <sys/tspriocntl.h>
104 # include <sys/iapriocntl.h>
105 # include <sys/fxpriocntl.h>
106 # include <sys/loadavg.h>
107 # include <string.h>
108 # include <stdio.h>
110 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
111 # include <sys/procfs.h> // see comment in <sys/procfs.h>
113 #define MAX_PATH (2 * K)
115 // for timer info max values which include all bits
116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
119 // Here are some liblgrp types from sys/lgrp_user.h to be able to
120 // compile on older systems without this header file.
122 #ifndef MADV_ACCESS_LWP
123 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
124 #endif
125 #ifndef MADV_ACCESS_MANY
126 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
127 #endif
129 #ifndef LGRP_RSRC_CPU
130 # define LGRP_RSRC_CPU 0 /* CPU resources */
131 #endif
132 #ifndef LGRP_RSRC_MEM
133 # define LGRP_RSRC_MEM 1 /* memory resources */
134 #endif
136 // see thr_setprio(3T) for the basis of these numbers
137 #define MinimumPriority 0
138 #define NormalPriority 64
139 #define MaximumPriority 127
141 // Values for ThreadPriorityPolicy == 1
142 int prio_policy1[CriticalPriority+1] = {
143 -99999, 0, 16, 32, 48, 64,
144 80, 96, 112, 124, 127, 127 };
146 // System parameters used internally
147 static clock_t clock_tics_per_sec = 100;
149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
150 static bool enabled_extended_FILE_stdio = false;
152 // For diagnostics to print a message once. see run_periodic_checks
153 static bool check_addr0_done = false;
154 static sigset_t check_signal_done;
155 static bool check_signals = true;
157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
163 // "default" initializers for missing libc APIs
164 extern "C" {
165 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
166 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
168 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
169 static int lwp_cond_destroy(cond_t *cv) { return 0; }
170 }
172 // "default" initializers for pthread-based synchronization
173 extern "C" {
174 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
175 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
176 }
178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
180 // Thread Local Storage
181 // This is common to all Solaris platforms so it is defined here,
182 // in this common file.
183 // The declarations are in the os_cpu threadLS*.hpp files.
184 //
185 // Static member initialization for TLS
186 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
188 #ifndef PRODUCT
189 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
191 int ThreadLocalStorage::_tcacheHit = 0;
192 int ThreadLocalStorage::_tcacheMiss = 0;
194 void ThreadLocalStorage::print_statistics() {
195 int total = _tcacheMiss+_tcacheHit;
196 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
197 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
198 }
199 #undef _PCT
200 #endif // PRODUCT
202 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
203 int index) {
204 Thread *thread = get_thread_slow();
205 if (thread != NULL) {
206 address sp = os::current_stack_pointer();
207 guarantee(thread->_stack_base == NULL ||
208 (sp <= thread->_stack_base &&
209 sp >= thread->_stack_base - thread->_stack_size) ||
210 is_error_reported(),
211 "sp must be inside of selected thread stack");
213 thread->set_self_raw_id(raw_id); // mark for quick retrieval
214 _get_thread_cache[ index ] = thread;
215 }
216 return thread;
217 }
220 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
221 #define NO_CACHED_THREAD ((Thread*)all_zero)
223 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
225 // Store the new value before updating the cache to prevent a race
226 // between get_thread_via_cache_slowly() and this store operation.
227 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
229 // Update thread cache with new thread if setting on thread create,
230 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
231 uintptr_t raw = pd_raw_thread_id();
232 int ix = pd_cache_index(raw);
233 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
234 }
236 void ThreadLocalStorage::pd_init() {
237 for (int i = 0; i < _pd_cache_size; i++) {
238 _get_thread_cache[i] = NO_CACHED_THREAD;
239 }
240 }
242 // Invalidate all the caches (happens to be the same as pd_init).
243 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
245 #undef NO_CACHED_THREAD
247 // END Thread Local Storage
249 static inline size_t adjust_stack_size(address base, size_t size) {
250 if ((ssize_t)size < 0) {
251 // 4759953: Compensate for ridiculous stack size.
252 size = max_intx;
253 }
254 if (size > (size_t)base) {
255 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
256 size = (size_t)base;
257 }
258 return size;
259 }
261 static inline stack_t get_stack_info() {
262 stack_t st;
263 int retval = thr_stksegment(&st);
264 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
265 assert(retval == 0, "incorrect return value from thr_stksegment");
266 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
267 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
268 return st;
269 }
271 address os::current_stack_base() {
272 int r = thr_main() ;
273 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
274 bool is_primordial_thread = r;
276 // Workaround 4352906, avoid calls to thr_stksegment by
277 // thr_main after the first one (it looks like we trash
278 // some data, causing the value for ss_sp to be incorrect).
279 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
280 stack_t st = get_stack_info();
281 if (is_primordial_thread) {
282 // cache initial value of stack base
283 os::Solaris::_main_stack_base = (address)st.ss_sp;
284 }
285 return (address)st.ss_sp;
286 } else {
287 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
288 return os::Solaris::_main_stack_base;
289 }
290 }
292 size_t os::current_stack_size() {
293 size_t size;
295 int r = thr_main() ;
296 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
297 if(!r) {
298 size = get_stack_info().ss_size;
299 } else {
300 struct rlimit limits;
301 getrlimit(RLIMIT_STACK, &limits);
302 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
303 }
304 // base may not be page aligned
305 address base = current_stack_base();
306 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
307 return (size_t)(base - bottom);
308 }
310 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
311 return localtime_r(clock, res);
312 }
314 // interruptible infrastructure
316 // setup_interruptible saves the thread state before going into an
317 // interruptible system call.
318 // The saved state is used to restore the thread to
319 // its former state whether or not an interrupt is received.
320 // Used by classloader os::read
321 // os::restartable_read calls skip this layer and stay in _thread_in_native
323 void os::Solaris::setup_interruptible(JavaThread* thread) {
325 JavaThreadState thread_state = thread->thread_state();
327 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
328 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
329 OSThread* osthread = thread->osthread();
330 osthread->set_saved_interrupt_thread_state(thread_state);
331 thread->frame_anchor()->make_walkable(thread);
332 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
333 }
335 // Version of setup_interruptible() for threads that are already in
336 // _thread_blocked. Used by os_sleep().
337 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
338 thread->frame_anchor()->make_walkable(thread);
339 }
341 JavaThread* os::Solaris::setup_interruptible() {
342 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
343 setup_interruptible(thread);
344 return thread;
345 }
347 void os::Solaris::try_enable_extended_io() {
348 typedef int (*enable_extended_FILE_stdio_t)(int, int);
350 if (!UseExtendedFileIO) {
351 return;
352 }
354 enable_extended_FILE_stdio_t enabler =
355 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
356 "enable_extended_FILE_stdio");
357 if (enabler) {
358 enabler(-1, -1);
359 }
360 }
363 #ifdef ASSERT
365 JavaThread* os::Solaris::setup_interruptible_native() {
366 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
367 JavaThreadState thread_state = thread->thread_state();
368 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
369 return thread;
370 }
372 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
373 JavaThreadState thread_state = thread->thread_state();
374 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
375 }
376 #endif
378 // cleanup_interruptible reverses the effects of setup_interruptible
379 // setup_interruptible_already_blocked() does not need any cleanup.
381 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
382 OSThread* osthread = thread->osthread();
384 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
385 }
387 // I/O interruption related counters called in _INTERRUPTIBLE
389 void os::Solaris::bump_interrupted_before_count() {
390 RuntimeService::record_interrupted_before_count();
391 }
393 void os::Solaris::bump_interrupted_during_count() {
394 RuntimeService::record_interrupted_during_count();
395 }
397 static int _processors_online = 0;
399 jint os::Solaris::_os_thread_limit = 0;
400 volatile jint os::Solaris::_os_thread_count = 0;
402 julong os::available_memory() {
403 return Solaris::available_memory();
404 }
406 julong os::Solaris::available_memory() {
407 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
408 }
410 julong os::Solaris::_physical_memory = 0;
412 julong os::physical_memory() {
413 return Solaris::physical_memory();
414 }
416 static hrtime_t first_hrtime = 0;
417 static const hrtime_t hrtime_hz = 1000*1000*1000;
418 const int LOCK_BUSY = 1;
419 const int LOCK_FREE = 0;
420 const int LOCK_INVALID = -1;
421 static volatile hrtime_t max_hrtime = 0;
422 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress
425 void os::Solaris::initialize_system_info() {
426 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
427 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
428 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
429 }
431 int os::active_processor_count() {
432 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
433 pid_t pid = getpid();
434 psetid_t pset = PS_NONE;
435 // Are we running in a processor set or is there any processor set around?
436 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
437 uint_t pset_cpus;
438 // Query the number of cpus available to us.
439 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
440 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
441 _processors_online = pset_cpus;
442 return pset_cpus;
443 }
444 }
445 // Otherwise return number of online cpus
446 return online_cpus;
447 }
449 static bool find_processors_in_pset(psetid_t pset,
450 processorid_t** id_array,
451 uint_t* id_length) {
452 bool result = false;
453 // Find the number of processors in the processor set.
454 if (pset_info(pset, NULL, id_length, NULL) == 0) {
455 // Make up an array to hold their ids.
456 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
457 // Fill in the array with their processor ids.
458 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
459 result = true;
460 }
461 }
462 return result;
463 }
465 // Callers of find_processors_online() must tolerate imprecise results --
466 // the system configuration can change asynchronously because of DR
467 // or explicit psradm operations.
468 //
469 // We also need to take care that the loop (below) terminates as the
470 // number of processors online can change between the _SC_NPROCESSORS_ONLN
471 // request and the loop that builds the list of processor ids. Unfortunately
472 // there's no reliable way to determine the maximum valid processor id,
473 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
474 // man pages, which claim the processor id set is "sparse, but
475 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
476 // exit the loop.
477 //
478 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
479 // not available on S8.0.
481 static bool find_processors_online(processorid_t** id_array,
482 uint* id_length) {
483 const processorid_t MAX_PROCESSOR_ID = 100000 ;
484 // Find the number of processors online.
485 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
486 // Make up an array to hold their ids.
487 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
488 // Processors need not be numbered consecutively.
489 long found = 0;
490 processorid_t next = 0;
491 while (found < *id_length && next < MAX_PROCESSOR_ID) {
492 processor_info_t info;
493 if (processor_info(next, &info) == 0) {
494 // NB, PI_NOINTR processors are effectively online ...
495 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
496 (*id_array)[found] = next;
497 found += 1;
498 }
499 }
500 next += 1;
501 }
502 if (found < *id_length) {
503 // The loop above didn't identify the expected number of processors.
504 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
505 // and re-running the loop, above, but there's no guarantee of progress
506 // if the system configuration is in flux. Instead, we just return what
507 // we've got. Note that in the worst case find_processors_online() could
508 // return an empty set. (As a fall-back in the case of the empty set we
509 // could just return the ID of the current processor).
510 *id_length = found ;
511 }
513 return true;
514 }
516 static bool assign_distribution(processorid_t* id_array,
517 uint id_length,
518 uint* distribution,
519 uint distribution_length) {
520 // We assume we can assign processorid_t's to uint's.
521 assert(sizeof(processorid_t) == sizeof(uint),
522 "can't convert processorid_t to uint");
523 // Quick check to see if we won't succeed.
524 if (id_length < distribution_length) {
525 return false;
526 }
527 // Assign processor ids to the distribution.
528 // Try to shuffle processors to distribute work across boards,
529 // assuming 4 processors per board.
530 const uint processors_per_board = ProcessDistributionStride;
531 // Find the maximum processor id.
532 processorid_t max_id = 0;
533 for (uint m = 0; m < id_length; m += 1) {
534 max_id = MAX2(max_id, id_array[m]);
535 }
536 // The next id, to limit loops.
537 const processorid_t limit_id = max_id + 1;
538 // Make up markers for available processors.
539 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
540 for (uint c = 0; c < limit_id; c += 1) {
541 available_id[c] = false;
542 }
543 for (uint a = 0; a < id_length; a += 1) {
544 available_id[id_array[a]] = true;
545 }
546 // Step by "boards", then by "slot", copying to "assigned".
547 // NEEDS_CLEANUP: The assignment of processors should be stateful,
548 // remembering which processors have been assigned by
549 // previous calls, etc., so as to distribute several
550 // independent calls of this method. What we'd like is
551 // It would be nice to have an API that let us ask
552 // how many processes are bound to a processor,
553 // but we don't have that, either.
554 // In the short term, "board" is static so that
555 // subsequent distributions don't all start at board 0.
556 static uint board = 0;
557 uint assigned = 0;
558 // Until we've found enough processors ....
559 while (assigned < distribution_length) {
560 // ... find the next available processor in the board.
561 for (uint slot = 0; slot < processors_per_board; slot += 1) {
562 uint try_id = board * processors_per_board + slot;
563 if ((try_id < limit_id) && (available_id[try_id] == true)) {
564 distribution[assigned] = try_id;
565 available_id[try_id] = false;
566 assigned += 1;
567 break;
568 }
569 }
570 board += 1;
571 if (board * processors_per_board + 0 >= limit_id) {
572 board = 0;
573 }
574 }
575 if (available_id != NULL) {
576 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
577 }
578 return true;
579 }
581 void os::set_native_thread_name(const char *name) {
582 // Not yet implemented.
583 return;
584 }
586 bool os::distribute_processes(uint length, uint* distribution) {
587 bool result = false;
588 // Find the processor id's of all the available CPUs.
589 processorid_t* id_array = NULL;
590 uint id_length = 0;
591 // There are some races between querying information and using it,
592 // since processor sets can change dynamically.
593 psetid_t pset = PS_NONE;
594 // Are we running in a processor set?
595 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
596 result = find_processors_in_pset(pset, &id_array, &id_length);
597 } else {
598 result = find_processors_online(&id_array, &id_length);
599 }
600 if (result == true) {
601 if (id_length >= length) {
602 result = assign_distribution(id_array, id_length, distribution, length);
603 } else {
604 result = false;
605 }
606 }
607 if (id_array != NULL) {
608 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
609 }
610 return result;
611 }
613 bool os::bind_to_processor(uint processor_id) {
614 // We assume that a processorid_t can be stored in a uint.
615 assert(sizeof(uint) == sizeof(processorid_t),
616 "can't convert uint to processorid_t");
617 int bind_result =
618 processor_bind(P_LWPID, // bind LWP.
619 P_MYID, // bind current LWP.
620 (processorid_t) processor_id, // id.
621 NULL); // don't return old binding.
622 return (bind_result == 0);
623 }
625 bool os::getenv(const char* name, char* buffer, int len) {
626 char* val = ::getenv( name );
627 if ( val == NULL
628 || strlen(val) + 1 > len ) {
629 if (len > 0) buffer[0] = 0; // return a null string
630 return false;
631 }
632 strcpy( buffer, val );
633 return true;
634 }
637 // Return true if user is running as root.
639 bool os::have_special_privileges() {
640 static bool init = false;
641 static bool privileges = false;
642 if (!init) {
643 privileges = (getuid() != geteuid()) || (getgid() != getegid());
644 init = true;
645 }
646 return privileges;
647 }
650 void os::init_system_properties_values() {
651 char arch[12];
652 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
654 // The next steps are taken in the product version:
655 //
656 // Obtain the JAVA_HOME value from the location of libjvm.so.
657 // This library should be located at:
658 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
659 //
660 // If "/jre/lib/" appears at the right place in the path, then we
661 // assume libjvm.so is installed in a JDK and we use this path.
662 //
663 // Otherwise exit with message: "Could not create the Java virtual machine."
664 //
665 // The following extra steps are taken in the debugging version:
666 //
667 // If "/jre/lib/" does NOT appear at the right place in the path
668 // instead of exit check for $JAVA_HOME environment variable.
669 //
670 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
671 // then we append a fake suffix "hotspot/libjvm.so" to this path so
672 // it looks like libjvm.so is installed there
673 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
674 //
675 // Otherwise exit.
676 //
677 // Important note: if the location of libjvm.so changes this
678 // code needs to be changed accordingly.
680 // The next few definitions allow the code to be verbatim:
681 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
682 #define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal)
683 #define getenv(n) ::getenv(n)
685 #define EXTENSIONS_DIR "/lib/ext"
686 #define ENDORSED_DIR "/lib/endorsed"
687 #define COMMON_DIR "/usr/jdk/packages"
689 {
690 /* sysclasspath, java_home, dll_dir */
691 {
692 char *home_path;
693 char *dll_path;
694 char *pslash;
695 char buf[MAXPATHLEN];
696 os::jvm_path(buf, sizeof(buf));
698 // Found the full path to libjvm.so.
699 // Now cut the path to <java_home>/jre if we can.
700 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
701 pslash = strrchr(buf, '/');
702 if (pslash != NULL)
703 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
704 dll_path = malloc(strlen(buf) + 1);
705 if (dll_path == NULL)
706 return;
707 strcpy(dll_path, buf);
708 Arguments::set_dll_dir(dll_path);
710 if (pslash != NULL) {
711 pslash = strrchr(buf, '/');
712 if (pslash != NULL) {
713 *pslash = '\0'; /* get rid of /<arch> */
714 pslash = strrchr(buf, '/');
715 if (pslash != NULL)
716 *pslash = '\0'; /* get rid of /lib */
717 }
718 }
720 home_path = malloc(strlen(buf) + 1);
721 if (home_path == NULL)
722 return;
723 strcpy(home_path, buf);
724 Arguments::set_java_home(home_path);
726 if (!set_boot_path('/', ':'))
727 return;
728 }
730 /*
731 * Where to look for native libraries
732 */
733 {
734 // Use dlinfo() to determine the correct java.library.path.
735 //
736 // If we're launched by the Java launcher, and the user
737 // does not set java.library.path explicitly on the commandline,
738 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
739 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
740 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
741 // /usr/lib), which is exactly what we want.
742 //
743 // If the user does set java.library.path, it completely
744 // overwrites this setting, and always has.
745 //
746 // If we're not launched by the Java launcher, we may
747 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
748 // settings. Again, dlinfo does exactly what we want.
750 Dl_serinfo _info, *info = &_info;
751 Dl_serpath *path;
752 char* library_path;
753 char *common_path;
754 int i;
756 // determine search path count and required buffer size
757 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
758 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
759 }
761 // allocate new buffer and initialize
762 info = (Dl_serinfo*)malloc(_info.dls_size);
763 if (info == NULL) {
764 vm_exit_out_of_memory(_info.dls_size, OOM_MALLOC_ERROR,
765 "init_system_properties_values info");
766 }
767 info->dls_size = _info.dls_size;
768 info->dls_cnt = _info.dls_cnt;
770 // obtain search path information
771 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
772 free(info);
773 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
774 }
776 path = &info->dls_serpath[0];
778 // Note: Due to a legacy implementation, most of the library path
779 // is set in the launcher. This was to accomodate linking restrictions
780 // on legacy Solaris implementations (which are no longer supported).
781 // Eventually, all the library path setting will be done here.
782 //
783 // However, to prevent the proliferation of improperly built native
784 // libraries, the new path component /usr/jdk/packages is added here.
786 // Determine the actual CPU architecture.
787 char cpu_arch[12];
788 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
789 #ifdef _LP64
790 // If we are a 64-bit vm, perform the following translations:
791 // sparc -> sparcv9
792 // i386 -> amd64
793 if (strcmp(cpu_arch, "sparc") == 0)
794 strcat(cpu_arch, "v9");
795 else if (strcmp(cpu_arch, "i386") == 0)
796 strcpy(cpu_arch, "amd64");
797 #endif
799 // Construct the invariant part of ld_library_path. Note that the
800 // space for the colon and the trailing null are provided by the
801 // nulls included by the sizeof operator.
802 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
803 common_path = malloc(bufsize);
804 if (common_path == NULL) {
805 free(info);
806 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR,
807 "init_system_properties_values common_path");
808 }
809 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
811 // struct size is more than sufficient for the path components obtained
812 // through the dlinfo() call, so only add additional space for the path
813 // components explicitly added here.
814 bufsize = info->dls_size + strlen(common_path);
815 library_path = malloc(bufsize);
816 if (library_path == NULL) {
817 free(info);
818 free(common_path);
819 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR,
820 "init_system_properties_values library_path");
821 }
822 library_path[0] = '\0';
824 // Construct the desired Java library path from the linker's library
825 // search path.
826 //
827 // For compatibility, it is optimal that we insert the additional path
828 // components specific to the Java VM after those components specified
829 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
830 // infrastructure.
831 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
832 strcpy(library_path, common_path);
833 } else {
834 int inserted = 0;
835 for (i = 0; i < info->dls_cnt; i++, path++) {
836 uint_t flags = path->dls_flags & LA_SER_MASK;
837 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
838 strcat(library_path, common_path);
839 strcat(library_path, os::path_separator());
840 inserted = 1;
841 }
842 strcat(library_path, path->dls_name);
843 strcat(library_path, os::path_separator());
844 }
845 // eliminate trailing path separator
846 library_path[strlen(library_path)-1] = '\0';
847 }
849 // happens before argument parsing - can't use a trace flag
850 // tty->print_raw("init_system_properties_values: native lib path: ");
851 // tty->print_raw_cr(library_path);
853 // callee copies into its own buffer
854 Arguments::set_library_path(library_path);
856 free(common_path);
857 free(library_path);
858 free(info);
859 }
861 /*
862 * Extensions directories.
863 *
864 * Note that the space for the colon and the trailing null are provided
865 * by the nulls included by the sizeof operator (so actually one byte more
866 * than necessary is allocated).
867 */
868 {
869 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
870 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
871 sizeof(EXTENSIONS_DIR));
872 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
873 Arguments::get_java_home());
874 Arguments::set_ext_dirs(buf);
875 }
877 /* Endorsed standards default directory. */
878 {
879 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
880 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
881 Arguments::set_endorsed_dirs(buf);
882 }
883 }
885 #undef malloc
886 #undef free
887 #undef getenv
888 #undef EXTENSIONS_DIR
889 #undef ENDORSED_DIR
890 #undef COMMON_DIR
892 }
894 void os::breakpoint() {
895 BREAKPOINT;
896 }
898 bool os::obsolete_option(const JavaVMOption *option)
899 {
900 if (!strncmp(option->optionString, "-Xt", 3)) {
901 return true;
902 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
903 return true;
904 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
905 return true;
906 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
907 return true;
908 }
909 return false;
910 }
912 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
913 address stackStart = (address)thread->stack_base();
914 address stackEnd = (address)(stackStart - (address)thread->stack_size());
915 if (sp < stackStart && sp >= stackEnd ) return true;
916 return false;
917 }
919 extern "C" void breakpoint() {
920 // use debugger to set breakpoint here
921 }
923 static thread_t main_thread;
925 // Thread start routine for all new Java threads
926 extern "C" void* java_start(void* thread_addr) {
927 // Try to randomize the cache line index of hot stack frames.
928 // This helps when threads of the same stack traces evict each other's
929 // cache lines. The threads can be either from the same JVM instance, or
930 // from different JVM instances. The benefit is especially true for
931 // processors with hyperthreading technology.
932 static int counter = 0;
933 int pid = os::current_process_id();
934 alloca(((pid ^ counter++) & 7) * 128);
936 int prio;
937 Thread* thread = (Thread*)thread_addr;
938 OSThread* osthr = thread->osthread();
940 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
941 thread->_schedctl = (void *) schedctl_init () ;
943 if (UseNUMA) {
944 int lgrp_id = os::numa_get_group_id();
945 if (lgrp_id != -1) {
946 thread->set_lgrp_id(lgrp_id);
947 }
948 }
950 // If the creator called set priority before we started,
951 // we need to call set_native_priority now that we have an lwp.
952 // We used to get the priority from thr_getprio (we called
953 // thr_setprio way back in create_thread) and pass it to
954 // set_native_priority, but Solaris scales the priority
955 // in java_to_os_priority, so when we read it back here,
956 // we pass trash to set_native_priority instead of what's
957 // in java_to_os_priority. So we save the native priority
958 // in the osThread and recall it here.
960 if ( osthr->thread_id() != -1 ) {
961 if ( UseThreadPriorities ) {
962 int prio = osthr->native_priority();
963 if (ThreadPriorityVerbose) {
964 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
965 INTPTR_FORMAT ", setting priority: %d\n",
966 osthr->thread_id(), osthr->lwp_id(), prio);
967 }
968 os::set_native_priority(thread, prio);
969 }
970 } else if (ThreadPriorityVerbose) {
971 warning("Can't set priority in _start routine, thread id hasn't been set\n");
972 }
974 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
976 // initialize signal mask for this thread
977 os::Solaris::hotspot_sigmask(thread);
979 thread->run();
981 // One less thread is executing
982 // When the VMThread gets here, the main thread may have already exited
983 // which frees the CodeHeap containing the Atomic::dec code
984 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
985 Atomic::dec(&os::Solaris::_os_thread_count);
986 }
988 if (UseDetachedThreads) {
989 thr_exit(NULL);
990 ShouldNotReachHere();
991 }
992 return NULL;
993 }
995 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
996 // Allocate the OSThread object
997 OSThread* osthread = new OSThread(NULL, NULL);
998 if (osthread == NULL) return NULL;
1000 // Store info on the Solaris thread into the OSThread
1001 osthread->set_thread_id(thread_id);
1002 osthread->set_lwp_id(_lwp_self());
1003 thread->_schedctl = (void *) schedctl_init () ;
1005 if (UseNUMA) {
1006 int lgrp_id = os::numa_get_group_id();
1007 if (lgrp_id != -1) {
1008 thread->set_lgrp_id(lgrp_id);
1009 }
1010 }
1012 if ( ThreadPriorityVerbose ) {
1013 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1014 osthread->thread_id(), osthread->lwp_id() );
1015 }
1017 // Initial thread state is INITIALIZED, not SUSPENDED
1018 osthread->set_state(INITIALIZED);
1020 return osthread;
1021 }
1023 void os::Solaris::hotspot_sigmask(Thread* thread) {
1025 //Save caller's signal mask
1026 sigset_t sigmask;
1027 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1028 OSThread *osthread = thread->osthread();
1029 osthread->set_caller_sigmask(sigmask);
1031 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1032 if (!ReduceSignalUsage) {
1033 if (thread->is_VM_thread()) {
1034 // Only the VM thread handles BREAK_SIGNAL ...
1035 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1036 } else {
1037 // ... all other threads block BREAK_SIGNAL
1038 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1039 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1040 }
1041 }
1042 }
1044 bool os::create_attached_thread(JavaThread* thread) {
1045 #ifdef ASSERT
1046 thread->verify_not_published();
1047 #endif
1048 OSThread* osthread = create_os_thread(thread, thr_self());
1049 if (osthread == NULL) {
1050 return false;
1051 }
1053 // Initial thread state is RUNNABLE
1054 osthread->set_state(RUNNABLE);
1055 thread->set_osthread(osthread);
1057 // initialize signal mask for this thread
1058 // and save the caller's signal mask
1059 os::Solaris::hotspot_sigmask(thread);
1061 return true;
1062 }
1064 bool os::create_main_thread(JavaThread* thread) {
1065 #ifdef ASSERT
1066 thread->verify_not_published();
1067 #endif
1068 if (_starting_thread == NULL) {
1069 _starting_thread = create_os_thread(thread, main_thread);
1070 if (_starting_thread == NULL) {
1071 return false;
1072 }
1073 }
1075 // The primodial thread is runnable from the start
1076 _starting_thread->set_state(RUNNABLE);
1078 thread->set_osthread(_starting_thread);
1080 // initialize signal mask for this thread
1081 // and save the caller's signal mask
1082 os::Solaris::hotspot_sigmask(thread);
1084 return true;
1085 }
1087 // _T2_libthread is true if we believe we are running with the newer
1088 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1089 bool os::Solaris::_T2_libthread = false;
1091 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1092 // Allocate the OSThread object
1093 OSThread* osthread = new OSThread(NULL, NULL);
1094 if (osthread == NULL) {
1095 return false;
1096 }
1098 if ( ThreadPriorityVerbose ) {
1099 char *thrtyp;
1100 switch ( thr_type ) {
1101 case vm_thread:
1102 thrtyp = (char *)"vm";
1103 break;
1104 case cgc_thread:
1105 thrtyp = (char *)"cgc";
1106 break;
1107 case pgc_thread:
1108 thrtyp = (char *)"pgc";
1109 break;
1110 case java_thread:
1111 thrtyp = (char *)"java";
1112 break;
1113 case compiler_thread:
1114 thrtyp = (char *)"compiler";
1115 break;
1116 case watcher_thread:
1117 thrtyp = (char *)"watcher";
1118 break;
1119 default:
1120 thrtyp = (char *)"unknown";
1121 break;
1122 }
1123 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1124 }
1126 // Calculate stack size if it's not specified by caller.
1127 if (stack_size == 0) {
1128 // The default stack size 1M (2M for LP64).
1129 stack_size = (BytesPerWord >> 2) * K * K;
1131 switch (thr_type) {
1132 case os::java_thread:
1133 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1134 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1135 break;
1136 case os::compiler_thread:
1137 if (CompilerThreadStackSize > 0) {
1138 stack_size = (size_t)(CompilerThreadStackSize * K);
1139 break;
1140 } // else fall through:
1141 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1142 case os::vm_thread:
1143 case os::pgc_thread:
1144 case os::cgc_thread:
1145 case os::watcher_thread:
1146 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1147 break;
1148 }
1149 }
1150 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1152 // Initial state is ALLOCATED but not INITIALIZED
1153 osthread->set_state(ALLOCATED);
1155 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1156 // We got lots of threads. Check if we still have some address space left.
1157 // Need to be at least 5Mb of unreserved address space. We do check by
1158 // trying to reserve some.
1159 const size_t VirtualMemoryBangSize = 20*K*K;
1160 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1161 if (mem == NULL) {
1162 delete osthread;
1163 return false;
1164 } else {
1165 // Release the memory again
1166 os::release_memory(mem, VirtualMemoryBangSize);
1167 }
1168 }
1170 // Setup osthread because the child thread may need it.
1171 thread->set_osthread(osthread);
1173 // Create the Solaris thread
1174 // explicit THR_BOUND for T2_libthread case in case
1175 // that assumption is not accurate, but our alternate signal stack
1176 // handling is based on it which must have bound threads
1177 thread_t tid = 0;
1178 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1179 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1180 (thr_type == vm_thread) ||
1181 (thr_type == cgc_thread) ||
1182 (thr_type == pgc_thread) ||
1183 (thr_type == compiler_thread && BackgroundCompilation)) ?
1184 THR_BOUND : 0);
1185 int status;
1187 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1188 //
1189 // On multiprocessors systems, libthread sometimes under-provisions our
1190 // process with LWPs. On a 30-way systems, for instance, we could have
1191 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1192 // to our process. This can result in under utilization of PEs.
1193 // I suspect the problem is related to libthread's LWP
1194 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1195 // upcall policy.
1196 //
1197 // The following code is palliative -- it attempts to ensure that our
1198 // process has sufficient LWPs to take advantage of multiple PEs.
1199 // Proper long-term cures include using user-level threads bound to LWPs
1200 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1201 // slight timing window with respect to sampling _os_thread_count, but
1202 // the race is benign. Also, we should periodically recompute
1203 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1204 // the number of PEs in our partition. You might be tempted to use
1205 // THR_NEW_LWP here, but I'd recommend against it as that could
1206 // result in undesirable growth of the libthread's LWP pool.
1207 // The fix below isn't sufficient; for instance, it doesn't take into count
1208 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1209 //
1210 // Some pathologies this scheme doesn't handle:
1211 // * Threads can block, releasing the LWPs. The LWPs can age out.
1212 // When a large number of threads become ready again there aren't
1213 // enough LWPs available to service them. This can occur when the
1214 // number of ready threads oscillates.
1215 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1216 //
1217 // Finally, we should call thr_setconcurrency() periodically to refresh
1218 // the LWP pool and thwart the LWP age-out mechanism.
1219 // The "+3" term provides a little slop -- we want to slightly overprovision.
1221 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1222 if (!(flags & THR_BOUND)) {
1223 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1224 }
1225 }
1226 // Although this doesn't hurt, we should warn of undefined behavior
1227 // when using unbound T1 threads with schedctl(). This should never
1228 // happen, as the compiler and VM threads are always created bound
1229 DEBUG_ONLY(
1230 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1231 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1232 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1233 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1234 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1235 }
1236 );
1239 // Mark that we don't have an lwp or thread id yet.
1240 // In case we attempt to set the priority before the thread starts.
1241 osthread->set_lwp_id(-1);
1242 osthread->set_thread_id(-1);
1244 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1245 if (status != 0) {
1246 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1247 perror("os::create_thread");
1248 }
1249 thread->set_osthread(NULL);
1250 // Need to clean up stuff we've allocated so far
1251 delete osthread;
1252 return false;
1253 }
1255 Atomic::inc(&os::Solaris::_os_thread_count);
1257 // Store info on the Solaris thread into the OSThread
1258 osthread->set_thread_id(tid);
1260 // Remember that we created this thread so we can set priority on it
1261 osthread->set_vm_created();
1263 // Set the default thread priority. If using bound threads, setting
1264 // lwp priority will be delayed until thread start.
1265 set_native_priority(thread,
1266 DefaultThreadPriority == -1 ?
1267 java_to_os_priority[NormPriority] :
1268 DefaultThreadPriority);
1270 // Initial thread state is INITIALIZED, not SUSPENDED
1271 osthread->set_state(INITIALIZED);
1273 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1274 return true;
1275 }
1277 /* defined for >= Solaris 10. This allows builds on earlier versions
1278 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1279 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1280 * and -XX:+UseAltSigs does nothing since these should have no conflict
1281 */
1282 #if !defined(SIGJVM1)
1283 #define SIGJVM1 39
1284 #define SIGJVM2 40
1285 #endif
1287 debug_only(static bool signal_sets_initialized = false);
1288 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1289 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1290 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1292 bool os::Solaris::is_sig_ignored(int sig) {
1293 struct sigaction oact;
1294 sigaction(sig, (struct sigaction*)NULL, &oact);
1295 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1296 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1297 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1298 return true;
1299 else
1300 return false;
1301 }
1303 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1304 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1305 static bool isJVM1available() {
1306 return SIGJVM1 < SIGRTMIN;
1307 }
1309 void os::Solaris::signal_sets_init() {
1310 // Should also have an assertion stating we are still single-threaded.
1311 assert(!signal_sets_initialized, "Already initialized");
1312 // Fill in signals that are necessarily unblocked for all threads in
1313 // the VM. Currently, we unblock the following signals:
1314 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1315 // by -Xrs (=ReduceSignalUsage));
1316 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1317 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1318 // the dispositions or masks wrt these signals.
1319 // Programs embedding the VM that want to use the above signals for their
1320 // own purposes must, at this time, use the "-Xrs" option to prevent
1321 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1322 // (See bug 4345157, and other related bugs).
1323 // In reality, though, unblocking these signals is really a nop, since
1324 // these signals are not blocked by default.
1325 sigemptyset(&unblocked_sigs);
1326 sigemptyset(&allowdebug_blocked_sigs);
1327 sigaddset(&unblocked_sigs, SIGILL);
1328 sigaddset(&unblocked_sigs, SIGSEGV);
1329 sigaddset(&unblocked_sigs, SIGBUS);
1330 sigaddset(&unblocked_sigs, SIGFPE);
1332 if (isJVM1available) {
1333 os::Solaris::set_SIGinterrupt(SIGJVM1);
1334 os::Solaris::set_SIGasync(SIGJVM2);
1335 } else if (UseAltSigs) {
1336 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1337 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1338 } else {
1339 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1340 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1341 }
1343 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1344 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1346 if (!ReduceSignalUsage) {
1347 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1348 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1349 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1350 }
1351 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1352 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1353 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1354 }
1355 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1356 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1357 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1358 }
1359 }
1360 // Fill in signals that are blocked by all but the VM thread.
1361 sigemptyset(&vm_sigs);
1362 if (!ReduceSignalUsage)
1363 sigaddset(&vm_sigs, BREAK_SIGNAL);
1364 debug_only(signal_sets_initialized = true);
1366 // For diagnostics only used in run_periodic_checks
1367 sigemptyset(&check_signal_done);
1368 }
1370 // These are signals that are unblocked while a thread is running Java.
1371 // (For some reason, they get blocked by default.)
1372 sigset_t* os::Solaris::unblocked_signals() {
1373 assert(signal_sets_initialized, "Not initialized");
1374 return &unblocked_sigs;
1375 }
1377 // These are the signals that are blocked while a (non-VM) thread is
1378 // running Java. Only the VM thread handles these signals.
1379 sigset_t* os::Solaris::vm_signals() {
1380 assert(signal_sets_initialized, "Not initialized");
1381 return &vm_sigs;
1382 }
1384 // These are signals that are blocked during cond_wait to allow debugger in
1385 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1386 assert(signal_sets_initialized, "Not initialized");
1387 return &allowdebug_blocked_sigs;
1388 }
1391 void _handle_uncaught_cxx_exception() {
1392 VMError err("An uncaught C++ exception");
1393 err.report_and_die();
1394 }
1397 // First crack at OS-specific initialization, from inside the new thread.
1398 void os::initialize_thread(Thread* thr) {
1399 int r = thr_main() ;
1400 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1401 if (r) {
1402 JavaThread* jt = (JavaThread *)thr;
1403 assert(jt != NULL,"Sanity check");
1404 size_t stack_size;
1405 address base = jt->stack_base();
1406 if (Arguments::created_by_java_launcher()) {
1407 // Use 2MB to allow for Solaris 7 64 bit mode.
1408 stack_size = JavaThread::stack_size_at_create() == 0
1409 ? 2048*K : JavaThread::stack_size_at_create();
1411 // There are rare cases when we may have already used more than
1412 // the basic stack size allotment before this method is invoked.
1413 // Attempt to allow for a normally sized java_stack.
1414 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1415 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1416 } else {
1417 // 6269555: If we were not created by a Java launcher, i.e. if we are
1418 // running embedded in a native application, treat the primordial thread
1419 // as much like a native attached thread as possible. This means using
1420 // the current stack size from thr_stksegment(), unless it is too large
1421 // to reliably setup guard pages. A reasonable max size is 8MB.
1422 size_t current_size = current_stack_size();
1423 // This should never happen, but just in case....
1424 if (current_size == 0) current_size = 2 * K * K;
1425 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1426 }
1427 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1428 stack_size = (size_t)(base - bottom);
1430 assert(stack_size > 0, "Stack size calculation problem");
1432 if (stack_size > jt->stack_size()) {
1433 NOT_PRODUCT(
1434 struct rlimit limits;
1435 getrlimit(RLIMIT_STACK, &limits);
1436 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1437 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1438 )
1439 tty->print_cr(
1440 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1441 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1442 "See limit(1) to increase the stack size limit.",
1443 stack_size / K, jt->stack_size() / K);
1444 vm_exit(1);
1445 }
1446 assert(jt->stack_size() >= stack_size,
1447 "Attempt to map more stack than was allocated");
1448 jt->set_stack_size(stack_size);
1449 }
1451 // 5/22/01: Right now alternate signal stacks do not handle
1452 // throwing stack overflow exceptions, see bug 4463178
1453 // Until a fix is found for this, T2 will NOT imply alternate signal
1454 // stacks.
1455 // If using T2 libthread threads, install an alternate signal stack.
1456 // Because alternate stacks associate with LWPs on Solaris,
1457 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1458 // we prefer to explicitly stack bang.
1459 // If not using T2 libthread, but using UseBoundThreads any threads
1460 // (primordial thread, jni_attachCurrentThread) we do not create,
1461 // probably are not bound, therefore they can not have an alternate
1462 // signal stack. Since our stack banging code is generated and
1463 // is shared across threads, all threads must be bound to allow
1464 // using alternate signal stacks. The alternative is to interpose
1465 // on _lwp_create to associate an alt sig stack with each LWP,
1466 // and this could be a problem when the JVM is embedded.
1467 // We would prefer to use alternate signal stacks with T2
1468 // Since there is currently no accurate way to detect T2
1469 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1470 // on installing alternate signal stacks
1473 // 05/09/03: removed alternate signal stack support for Solaris
1474 // The alternate signal stack mechanism is no longer needed to
1475 // handle stack overflow. This is now handled by allocating
1476 // guard pages (red zone) and stackbanging.
1477 // Initially the alternate signal stack mechanism was removed because
1478 // it did not work with T1 llibthread. Alternate
1479 // signal stacks MUST have all threads bound to lwps. Applications
1480 // can create their own threads and attach them without their being
1481 // bound under T1. This is frequently the case for the primordial thread.
1482 // If we were ever to reenable this mechanism we would need to
1483 // use the dynamic check for T2 libthread.
1485 os::Solaris::init_thread_fpu_state();
1486 std::set_terminate(_handle_uncaught_cxx_exception);
1487 }
1491 // Free Solaris resources related to the OSThread
1492 void os::free_thread(OSThread* osthread) {
1493 assert(osthread != NULL, "os::free_thread but osthread not set");
1496 // We are told to free resources of the argument thread,
1497 // but we can only really operate on the current thread.
1498 // The main thread must take the VMThread down synchronously
1499 // before the main thread exits and frees up CodeHeap
1500 guarantee((Thread::current()->osthread() == osthread
1501 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1502 if (Thread::current()->osthread() == osthread) {
1503 // Restore caller's signal mask
1504 sigset_t sigmask = osthread->caller_sigmask();
1505 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1506 }
1507 delete osthread;
1508 }
1510 void os::pd_start_thread(Thread* thread) {
1511 int status = thr_continue(thread->osthread()->thread_id());
1512 assert_status(status == 0, status, "thr_continue failed");
1513 }
1516 intx os::current_thread_id() {
1517 return (intx)thr_self();
1518 }
1520 static pid_t _initial_pid = 0;
1522 int os::current_process_id() {
1523 return (int)(_initial_pid ? _initial_pid : getpid());
1524 }
1526 int os::allocate_thread_local_storage() {
1527 // %%% in Win32 this allocates a memory segment pointed to by a
1528 // register. Dan Stein can implement a similar feature in
1529 // Solaris. Alternatively, the VM can do the same thing
1530 // explicitly: malloc some storage and keep the pointer in a
1531 // register (which is part of the thread's context) (or keep it
1532 // in TLS).
1533 // %%% In current versions of Solaris, thr_self and TSD can
1534 // be accessed via short sequences of displaced indirections.
1535 // The value of thr_self is available as %g7(36).
1536 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1537 // assuming that the current thread already has a value bound to k.
1538 // It may be worth experimenting with such access patterns,
1539 // and later having the parameters formally exported from a Solaris
1540 // interface. I think, however, that it will be faster to
1541 // maintain the invariant that %g2 always contains the
1542 // JavaThread in Java code, and have stubs simply
1543 // treat %g2 as a caller-save register, preserving it in a %lN.
1544 thread_key_t tk;
1545 if (thr_keycreate( &tk, NULL ) )
1546 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1547 "(%s)", strerror(errno)));
1548 return int(tk);
1549 }
1551 void os::free_thread_local_storage(int index) {
1552 // %%% don't think we need anything here
1553 // if ( pthread_key_delete((pthread_key_t) tk) )
1554 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1555 }
1557 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1558 // small number - point is NO swap space available
1559 void os::thread_local_storage_at_put(int index, void* value) {
1560 // %%% this is used only in threadLocalStorage.cpp
1561 if (thr_setspecific((thread_key_t)index, value)) {
1562 if (errno == ENOMEM) {
1563 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR,
1564 "thr_setspecific: out of swap space");
1565 } else {
1566 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1567 "(%s)", strerror(errno)));
1568 }
1569 } else {
1570 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1571 }
1572 }
1574 // This function could be called before TLS is initialized, for example, when
1575 // VM receives an async signal or when VM causes a fatal error during
1576 // initialization. Return NULL if thr_getspecific() fails.
1577 void* os::thread_local_storage_at(int index) {
1578 // %%% this is used only in threadLocalStorage.cpp
1579 void* r = NULL;
1580 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1581 }
1584 // gethrtime can move backwards if read from one cpu and then a different cpu
1585 // getTimeNanos is guaranteed to not move backward on Solaris
1586 // local spinloop created as faster for a CAS on an int than
1587 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1588 // supported on sparc v8 or pre supports_cx8 intel boxes.
1589 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1590 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1591 inline hrtime_t oldgetTimeNanos() {
1592 int gotlock = LOCK_INVALID;
1593 hrtime_t newtime = gethrtime();
1595 for (;;) {
1596 // grab lock for max_hrtime
1597 int curlock = max_hrtime_lock;
1598 if (curlock & LOCK_BUSY) continue;
1599 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1600 if (newtime > max_hrtime) {
1601 max_hrtime = newtime;
1602 } else {
1603 newtime = max_hrtime;
1604 }
1605 // release lock
1606 max_hrtime_lock = LOCK_FREE;
1607 return newtime;
1608 }
1609 }
1610 // gethrtime can move backwards if read from one cpu and then a different cpu
1611 // getTimeNanos is guaranteed to not move backward on Solaris
1612 inline hrtime_t getTimeNanos() {
1613 if (VM_Version::supports_cx8()) {
1614 const hrtime_t now = gethrtime();
1615 // Use atomic long load since 32-bit x86 uses 2 registers to keep long.
1616 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime);
1617 if (now <= prev) return prev; // same or retrograde time;
1618 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1619 assert(obsv >= prev, "invariant"); // Monotonicity
1620 // If the CAS succeeded then we're done and return "now".
1621 // If the CAS failed and the observed value "obs" is >= now then
1622 // we should return "obs". If the CAS failed and now > obs > prv then
1623 // some other thread raced this thread and installed a new value, in which case
1624 // we could either (a) retry the entire operation, (b) retry trying to install now
1625 // or (c) just return obs. We use (c). No loop is required although in some cases
1626 // we might discard a higher "now" value in deference to a slightly lower but freshly
1627 // installed obs value. That's entirely benign -- it admits no new orderings compared
1628 // to (a) or (b) -- and greatly reduces coherence traffic.
1629 // We might also condition (c) on the magnitude of the delta between obs and now.
1630 // Avoiding excessive CAS operations to hot RW locations is critical.
1631 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1632 return (prev == obsv) ? now : obsv ;
1633 } else {
1634 return oldgetTimeNanos();
1635 }
1636 }
1638 // Time since start-up in seconds to a fine granularity.
1639 // Used by VMSelfDestructTimer and the MemProfiler.
1640 double os::elapsedTime() {
1641 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1642 }
1644 jlong os::elapsed_counter() {
1645 return (jlong)(getTimeNanos() - first_hrtime);
1646 }
1648 jlong os::elapsed_frequency() {
1649 return hrtime_hz;
1650 }
1652 // Return the real, user, and system times in seconds from an
1653 // arbitrary fixed point in the past.
1654 bool os::getTimesSecs(double* process_real_time,
1655 double* process_user_time,
1656 double* process_system_time) {
1657 struct tms ticks;
1658 clock_t real_ticks = times(&ticks);
1660 if (real_ticks == (clock_t) (-1)) {
1661 return false;
1662 } else {
1663 double ticks_per_second = (double) clock_tics_per_sec;
1664 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1665 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1666 // For consistency return the real time from getTimeNanos()
1667 // converted to seconds.
1668 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1670 return true;
1671 }
1672 }
1674 bool os::supports_vtime() { return true; }
1676 bool os::enable_vtime() {
1677 int fd = ::open("/proc/self/ctl", O_WRONLY);
1678 if (fd == -1)
1679 return false;
1681 long cmd[] = { PCSET, PR_MSACCT };
1682 int res = ::write(fd, cmd, sizeof(long) * 2);
1683 ::close(fd);
1684 if (res != sizeof(long) * 2)
1685 return false;
1687 return true;
1688 }
1690 bool os::vtime_enabled() {
1691 int fd = ::open("/proc/self/status", O_RDONLY);
1692 if (fd == -1)
1693 return false;
1695 pstatus_t status;
1696 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1697 ::close(fd);
1698 if (res != sizeof(pstatus_t))
1699 return false;
1701 return status.pr_flags & PR_MSACCT;
1702 }
1704 double os::elapsedVTime() {
1705 return (double)gethrvtime() / (double)hrtime_hz;
1706 }
1708 // Used internally for comparisons only
1709 // getTimeMillis guaranteed to not move backwards on Solaris
1710 jlong getTimeMillis() {
1711 jlong nanotime = getTimeNanos();
1712 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1713 }
1715 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1716 jlong os::javaTimeMillis() {
1717 timeval t;
1718 if (gettimeofday( &t, NULL) == -1)
1719 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1720 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1721 }
1723 jlong os::javaTimeNanos() {
1724 return (jlong)getTimeNanos();
1725 }
1727 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1728 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1729 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1730 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1731 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1732 }
1734 char * os::local_time_string(char *buf, size_t buflen) {
1735 struct tm t;
1736 time_t long_time;
1737 time(&long_time);
1738 localtime_r(&long_time, &t);
1739 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1740 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1741 t.tm_hour, t.tm_min, t.tm_sec);
1742 return buf;
1743 }
1745 // Note: os::shutdown() might be called very early during initialization, or
1746 // called from signal handler. Before adding something to os::shutdown(), make
1747 // sure it is async-safe and can handle partially initialized VM.
1748 void os::shutdown() {
1750 // allow PerfMemory to attempt cleanup of any persistent resources
1751 perfMemory_exit();
1753 // needs to remove object in file system
1754 AttachListener::abort();
1756 // flush buffered output, finish log files
1757 ostream_abort();
1759 // Check for abort hook
1760 abort_hook_t abort_hook = Arguments::abort_hook();
1761 if (abort_hook != NULL) {
1762 abort_hook();
1763 }
1764 }
1766 // Note: os::abort() might be called very early during initialization, or
1767 // called from signal handler. Before adding something to os::abort(), make
1768 // sure it is async-safe and can handle partially initialized VM.
1769 void os::abort(bool dump_core) {
1770 os::shutdown();
1771 if (dump_core) {
1772 #ifndef PRODUCT
1773 fdStream out(defaultStream::output_fd());
1774 out.print_raw("Current thread is ");
1775 char buf[16];
1776 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1777 out.print_raw_cr(buf);
1778 out.print_raw_cr("Dumping core ...");
1779 #endif
1780 ::abort(); // dump core (for debugging)
1781 }
1783 ::exit(1);
1784 }
1786 // Die immediately, no exit hook, no abort hook, no cleanup.
1787 void os::die() {
1788 ::abort(); // dump core (for debugging)
1789 }
1791 // unused
1792 void os::set_error_file(const char *logfile) {}
1794 // DLL functions
1796 const char* os::dll_file_extension() { return ".so"; }
1798 // This must be hard coded because it's the system's temporary
1799 // directory not the java application's temp directory, ala java.io.tmpdir.
1800 const char* os::get_temp_directory() { return "/tmp"; }
1802 static bool file_exists(const char* filename) {
1803 struct stat statbuf;
1804 if (filename == NULL || strlen(filename) == 0) {
1805 return false;
1806 }
1807 return os::stat(filename, &statbuf) == 0;
1808 }
1810 bool os::dll_build_name(char* buffer, size_t buflen,
1811 const char* pname, const char* fname) {
1812 bool retval = false;
1813 const size_t pnamelen = pname ? strlen(pname) : 0;
1815 // Return error on buffer overflow.
1816 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1817 return retval;
1818 }
1820 if (pnamelen == 0) {
1821 snprintf(buffer, buflen, "lib%s.so", fname);
1822 retval = true;
1823 } else if (strchr(pname, *os::path_separator()) != NULL) {
1824 int n;
1825 char** pelements = split_path(pname, &n);
1826 if (pelements == NULL) {
1827 return false;
1828 }
1829 for (int i = 0 ; i < n ; i++) {
1830 // really shouldn't be NULL but what the heck, check can't hurt
1831 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1832 continue; // skip the empty path values
1833 }
1834 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1835 if (file_exists(buffer)) {
1836 retval = true;
1837 break;
1838 }
1839 }
1840 // release the storage
1841 for (int i = 0 ; i < n ; i++) {
1842 if (pelements[i] != NULL) {
1843 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1844 }
1845 }
1846 if (pelements != NULL) {
1847 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1848 }
1849 } else {
1850 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1851 retval = true;
1852 }
1853 return retval;
1854 }
1856 // check if addr is inside libjvm.so
1857 bool os::address_is_in_vm(address addr) {
1858 static address libjvm_base_addr;
1859 Dl_info dlinfo;
1861 if (libjvm_base_addr == NULL) {
1862 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1863 libjvm_base_addr = (address)dlinfo.dli_fbase;
1864 }
1865 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1866 }
1868 if (dladdr((void *)addr, &dlinfo) != 0) {
1869 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1870 }
1872 return false;
1873 }
1875 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1876 static dladdr1_func_type dladdr1_func = NULL;
1878 bool os::dll_address_to_function_name(address addr, char *buf,
1879 int buflen, int * offset) {
1880 // buf is not optional, but offset is optional
1881 assert(buf != NULL, "sanity check");
1883 Dl_info dlinfo;
1885 // dladdr1_func was initialized in os::init()
1886 if (dladdr1_func != NULL) {
1887 // yes, we have dladdr1
1889 // Support for dladdr1 is checked at runtime; it may be
1890 // available even if the vm is built on a machine that does
1891 // not have dladdr1 support. Make sure there is a value for
1892 // RTLD_DL_SYMENT.
1893 #ifndef RTLD_DL_SYMENT
1894 #define RTLD_DL_SYMENT 1
1895 #endif
1896 #ifdef _LP64
1897 Elf64_Sym * info;
1898 #else
1899 Elf32_Sym * info;
1900 #endif
1901 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1902 RTLD_DL_SYMENT) != 0) {
1903 // see if we have a matching symbol that covers our address
1904 if (dlinfo.dli_saddr != NULL &&
1905 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1906 if (dlinfo.dli_sname != NULL) {
1907 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1908 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1909 }
1910 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1911 return true;
1912 }
1913 }
1914 // no matching symbol so try for just file info
1915 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1916 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1917 buf, buflen, offset, dlinfo.dli_fname)) {
1918 return true;
1919 }
1920 }
1921 }
1922 buf[0] = '\0';
1923 if (offset != NULL) *offset = -1;
1924 return false;
1925 }
1927 // no, only dladdr is available
1928 if (dladdr((void *)addr, &dlinfo) != 0) {
1929 // see if we have a matching symbol
1930 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1931 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1932 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1933 }
1934 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1935 return true;
1936 }
1937 // no matching symbol so try for just file info
1938 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1939 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1940 buf, buflen, offset, dlinfo.dli_fname)) {
1941 return true;
1942 }
1943 }
1944 }
1945 buf[0] = '\0';
1946 if (offset != NULL) *offset = -1;
1947 return false;
1948 }
1950 bool os::dll_address_to_library_name(address addr, char* buf,
1951 int buflen, int* offset) {
1952 // buf is not optional, but offset is optional
1953 assert(buf != NULL, "sanity check");
1955 Dl_info dlinfo;
1957 if (dladdr((void*)addr, &dlinfo) != 0) {
1958 if (dlinfo.dli_fname != NULL) {
1959 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1960 }
1961 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1962 *offset = addr - (address)dlinfo.dli_fbase;
1963 }
1964 return true;
1965 }
1967 buf[0] = '\0';
1968 if (offset) *offset = -1;
1969 return false;
1970 }
1972 // Prints the names and full paths of all opened dynamic libraries
1973 // for current process
1974 void os::print_dll_info(outputStream * st) {
1975 Dl_info dli;
1976 void *handle;
1977 Link_map *map;
1978 Link_map *p;
1980 st->print_cr("Dynamic libraries:"); st->flush();
1982 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1983 dli.dli_fname == NULL) {
1984 st->print_cr("Error: Cannot print dynamic libraries.");
1985 return;
1986 }
1987 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1988 if (handle == NULL) {
1989 st->print_cr("Error: Cannot print dynamic libraries.");
1990 return;
1991 }
1992 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1993 if (map == NULL) {
1994 st->print_cr("Error: Cannot print dynamic libraries.");
1995 return;
1996 }
1998 while (map->l_prev != NULL)
1999 map = map->l_prev;
2001 while (map != NULL) {
2002 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2003 map = map->l_next;
2004 }
2006 dlclose(handle);
2007 }
2009 // Loads .dll/.so and
2010 // in case of error it checks if .dll/.so was built for the
2011 // same architecture as Hotspot is running on
2013 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2014 {
2015 void * result= ::dlopen(filename, RTLD_LAZY);
2016 if (result != NULL) {
2017 // Successful loading
2018 return result;
2019 }
2021 Elf32_Ehdr elf_head;
2023 // Read system error message into ebuf
2024 // It may or may not be overwritten below
2025 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2026 ebuf[ebuflen-1]='\0';
2027 int diag_msg_max_length=ebuflen-strlen(ebuf);
2028 char* diag_msg_buf=ebuf+strlen(ebuf);
2030 if (diag_msg_max_length==0) {
2031 // No more space in ebuf for additional diagnostics message
2032 return NULL;
2033 }
2036 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2038 if (file_descriptor < 0) {
2039 // Can't open library, report dlerror() message
2040 return NULL;
2041 }
2043 bool failed_to_read_elf_head=
2044 (sizeof(elf_head)!=
2045 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2047 ::close(file_descriptor);
2048 if (failed_to_read_elf_head) {
2049 // file i/o error - report dlerror() msg
2050 return NULL;
2051 }
2053 typedef struct {
2054 Elf32_Half code; // Actual value as defined in elf.h
2055 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2056 char elf_class; // 32 or 64 bit
2057 char endianess; // MSB or LSB
2058 char* name; // String representation
2059 } arch_t;
2061 static const arch_t arch_array[]={
2062 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2063 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2064 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2065 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2066 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2067 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2068 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2069 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2070 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2071 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2072 };
2074 #if (defined IA32)
2075 static Elf32_Half running_arch_code=EM_386;
2076 #elif (defined AMD64)
2077 static Elf32_Half running_arch_code=EM_X86_64;
2078 #elif (defined IA64)
2079 static Elf32_Half running_arch_code=EM_IA_64;
2080 #elif (defined __sparc) && (defined _LP64)
2081 static Elf32_Half running_arch_code=EM_SPARCV9;
2082 #elif (defined __sparc) && (!defined _LP64)
2083 static Elf32_Half running_arch_code=EM_SPARC;
2084 #elif (defined __powerpc64__)
2085 static Elf32_Half running_arch_code=EM_PPC64;
2086 #elif (defined __powerpc__)
2087 static Elf32_Half running_arch_code=EM_PPC;
2088 #elif (defined ARM)
2089 static Elf32_Half running_arch_code=EM_ARM;
2090 #else
2091 #error Method os::dll_load requires that one of following is defined:\
2092 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2093 #endif
2095 // Identify compatability class for VM's architecture and library's architecture
2096 // Obtain string descriptions for architectures
2098 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2099 int running_arch_index=-1;
2101 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2102 if (running_arch_code == arch_array[i].code) {
2103 running_arch_index = i;
2104 }
2105 if (lib_arch.code == arch_array[i].code) {
2106 lib_arch.compat_class = arch_array[i].compat_class;
2107 lib_arch.name = arch_array[i].name;
2108 }
2109 }
2111 assert(running_arch_index != -1,
2112 "Didn't find running architecture code (running_arch_code) in arch_array");
2113 if (running_arch_index == -1) {
2114 // Even though running architecture detection failed
2115 // we may still continue with reporting dlerror() message
2116 return NULL;
2117 }
2119 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2120 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2121 return NULL;
2122 }
2124 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2125 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2126 return NULL;
2127 }
2129 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2130 if ( lib_arch.name!=NULL ) {
2131 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2132 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2133 lib_arch.name, arch_array[running_arch_index].name);
2134 } else {
2135 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2136 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2137 lib_arch.code,
2138 arch_array[running_arch_index].name);
2139 }
2140 }
2142 return NULL;
2143 }
2145 void* os::dll_lookup(void* handle, const char* name) {
2146 return dlsym(handle, name);
2147 }
2149 void* os::get_default_process_handle() {
2150 return (void*)::dlopen(NULL, RTLD_LAZY);
2151 }
2153 int os::stat(const char *path, struct stat *sbuf) {
2154 char pathbuf[MAX_PATH];
2155 if (strlen(path) > MAX_PATH - 1) {
2156 errno = ENAMETOOLONG;
2157 return -1;
2158 }
2159 os::native_path(strcpy(pathbuf, path));
2160 return ::stat(pathbuf, sbuf);
2161 }
2163 static bool _print_ascii_file(const char* filename, outputStream* st) {
2164 int fd = ::open(filename, O_RDONLY);
2165 if (fd == -1) {
2166 return false;
2167 }
2169 char buf[32];
2170 int bytes;
2171 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2172 st->print_raw(buf, bytes);
2173 }
2175 ::close(fd);
2177 return true;
2178 }
2180 void os::print_os_info_brief(outputStream* st) {
2181 os::Solaris::print_distro_info(st);
2183 os::Posix::print_uname_info(st);
2185 os::Solaris::print_libversion_info(st);
2186 }
2188 void os::print_os_info(outputStream* st) {
2189 st->print("OS:");
2191 os::Solaris::print_distro_info(st);
2193 os::Posix::print_uname_info(st);
2195 os::Solaris::print_libversion_info(st);
2197 os::Posix::print_rlimit_info(st);
2199 os::Posix::print_load_average(st);
2200 }
2202 void os::Solaris::print_distro_info(outputStream* st) {
2203 if (!_print_ascii_file("/etc/release", st)) {
2204 st->print("Solaris");
2205 }
2206 st->cr();
2207 }
2209 void os::Solaris::print_libversion_info(outputStream* st) {
2210 if (os::Solaris::T2_libthread()) {
2211 st->print(" (T2 libthread)");
2212 }
2213 else {
2214 st->print(" (T1 libthread)");
2215 }
2216 st->cr();
2217 }
2219 static bool check_addr0(outputStream* st) {
2220 jboolean status = false;
2221 int fd = ::open("/proc/self/map",O_RDONLY);
2222 if (fd >= 0) {
2223 prmap_t p;
2224 while(::read(fd, &p, sizeof(p)) > 0) {
2225 if (p.pr_vaddr == 0x0) {
2226 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2227 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2228 st->print("Access:");
2229 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2230 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2231 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2232 st->cr();
2233 status = true;
2234 }
2235 ::close(fd);
2236 }
2237 }
2238 return status;
2239 }
2241 void os::pd_print_cpu_info(outputStream* st) {
2242 // Nothing to do for now.
2243 }
2245 void os::print_memory_info(outputStream* st) {
2246 st->print("Memory:");
2247 st->print(" %dk page", os::vm_page_size()>>10);
2248 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2249 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2250 st->cr();
2251 (void) check_addr0(st);
2252 }
2254 void os::print_siginfo(outputStream* st, void* siginfo) {
2255 const siginfo_t* si = (const siginfo_t*)siginfo;
2257 os::Posix::print_siginfo_brief(st, si);
2259 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2260 UseSharedSpaces) {
2261 FileMapInfo* mapinfo = FileMapInfo::current_info();
2262 if (mapinfo->is_in_shared_space(si->si_addr)) {
2263 st->print("\n\nError accessing class data sharing archive." \
2264 " Mapped file inaccessible during execution, " \
2265 " possible disk/network problem.");
2266 }
2267 }
2268 st->cr();
2269 }
2271 // Moved from whole group, because we need them here for diagnostic
2272 // prints.
2273 #define OLDMAXSIGNUM 32
2274 static int Maxsignum = 0;
2275 static int *ourSigFlags = NULL;
2277 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2279 int os::Solaris::get_our_sigflags(int sig) {
2280 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2281 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2282 return ourSigFlags[sig];
2283 }
2285 void os::Solaris::set_our_sigflags(int sig, int flags) {
2286 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2287 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2288 ourSigFlags[sig] = flags;
2289 }
2292 static const char* get_signal_handler_name(address handler,
2293 char* buf, int buflen) {
2294 int offset;
2295 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2296 if (found) {
2297 // skip directory names
2298 const char *p1, *p2;
2299 p1 = buf;
2300 size_t len = strlen(os::file_separator());
2301 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2302 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2303 } else {
2304 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2305 }
2306 return buf;
2307 }
2309 static void print_signal_handler(outputStream* st, int sig,
2310 char* buf, size_t buflen) {
2311 struct sigaction sa;
2313 sigaction(sig, NULL, &sa);
2315 st->print("%s: ", os::exception_name(sig, buf, buflen));
2317 address handler = (sa.sa_flags & SA_SIGINFO)
2318 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2319 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2321 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2322 st->print("SIG_DFL");
2323 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2324 st->print("SIG_IGN");
2325 } else {
2326 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2327 }
2329 st->print(", sa_mask[0]=");
2330 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2332 address rh = VMError::get_resetted_sighandler(sig);
2333 // May be, handler was resetted by VMError?
2334 if(rh != NULL) {
2335 handler = rh;
2336 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2337 }
2339 st->print(", sa_flags=");
2340 os::Posix::print_sa_flags(st, sa.sa_flags);
2342 // Check: is it our handler?
2343 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2344 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2345 // It is our signal handler
2346 // check for flags
2347 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2348 st->print(
2349 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2350 os::Solaris::get_our_sigflags(sig));
2351 }
2352 }
2353 st->cr();
2354 }
2356 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2357 st->print_cr("Signal Handlers:");
2358 print_signal_handler(st, SIGSEGV, buf, buflen);
2359 print_signal_handler(st, SIGBUS , buf, buflen);
2360 print_signal_handler(st, SIGFPE , buf, buflen);
2361 print_signal_handler(st, SIGPIPE, buf, buflen);
2362 print_signal_handler(st, SIGXFSZ, buf, buflen);
2363 print_signal_handler(st, SIGILL , buf, buflen);
2364 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2365 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2366 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2367 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2368 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2369 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2370 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2371 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2372 }
2374 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2376 // Find the full path to the current module, libjvm.so
2377 void os::jvm_path(char *buf, jint buflen) {
2378 // Error checking.
2379 if (buflen < MAXPATHLEN) {
2380 assert(false, "must use a large-enough buffer");
2381 buf[0] = '\0';
2382 return;
2383 }
2384 // Lazy resolve the path to current module.
2385 if (saved_jvm_path[0] != 0) {
2386 strcpy(buf, saved_jvm_path);
2387 return;
2388 }
2390 Dl_info dlinfo;
2391 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2392 assert(ret != 0, "cannot locate libjvm");
2393 if (ret != 0 && dlinfo.dli_fname != NULL) {
2394 realpath((char *)dlinfo.dli_fname, buf);
2395 } else {
2396 buf[0] = '\0';
2397 return;
2398 }
2400 if (Arguments::created_by_gamma_launcher()) {
2401 // Support for the gamma launcher. Typical value for buf is
2402 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2403 // the right place in the string, then assume we are installed in a JDK and
2404 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2405 // up the path so it looks like libjvm.so is installed there (append a
2406 // fake suffix hotspot/libjvm.so).
2407 const char *p = buf + strlen(buf) - 1;
2408 for (int count = 0; p > buf && count < 5; ++count) {
2409 for (--p; p > buf && *p != '/'; --p)
2410 /* empty */ ;
2411 }
2413 if (strncmp(p, "/jre/lib/", 9) != 0) {
2414 // Look for JAVA_HOME in the environment.
2415 char* java_home_var = ::getenv("JAVA_HOME");
2416 if (java_home_var != NULL && java_home_var[0] != 0) {
2417 char cpu_arch[12];
2418 char* jrelib_p;
2419 int len;
2420 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2421 #ifdef _LP64
2422 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2423 if (strcmp(cpu_arch, "sparc") == 0) {
2424 strcat(cpu_arch, "v9");
2425 } else if (strcmp(cpu_arch, "i386") == 0) {
2426 strcpy(cpu_arch, "amd64");
2427 }
2428 #endif
2429 // Check the current module name "libjvm.so".
2430 p = strrchr(buf, '/');
2431 assert(strstr(p, "/libjvm") == p, "invalid library name");
2433 realpath(java_home_var, buf);
2434 // determine if this is a legacy image or modules image
2435 // modules image doesn't have "jre" subdirectory
2436 len = strlen(buf);
2437 jrelib_p = buf + len;
2438 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2439 if (0 != access(buf, F_OK)) {
2440 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2441 }
2443 if (0 == access(buf, F_OK)) {
2444 // Use current module name "libjvm.so"
2445 len = strlen(buf);
2446 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2447 } else {
2448 // Go back to path of .so
2449 realpath((char *)dlinfo.dli_fname, buf);
2450 }
2451 }
2452 }
2453 }
2455 strcpy(saved_jvm_path, buf);
2456 }
2459 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2460 // no prefix required, not even "_"
2461 }
2464 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2465 // no suffix required
2466 }
2468 // This method is a copy of JDK's sysGetLastErrorString
2469 // from src/solaris/hpi/src/system_md.c
2471 size_t os::lasterror(char *buf, size_t len) {
2473 if (errno == 0) return 0;
2475 const char *s = ::strerror(errno);
2476 size_t n = ::strlen(s);
2477 if (n >= len) {
2478 n = len - 1;
2479 }
2480 ::strncpy(buf, s, n);
2481 buf[n] = '\0';
2482 return n;
2483 }
2486 // sun.misc.Signal
2488 extern "C" {
2489 static void UserHandler(int sig, void *siginfo, void *context) {
2490 // Ctrl-C is pressed during error reporting, likely because the error
2491 // handler fails to abort. Let VM die immediately.
2492 if (sig == SIGINT && is_error_reported()) {
2493 os::die();
2494 }
2496 os::signal_notify(sig);
2497 // We do not need to reinstate the signal handler each time...
2498 }
2499 }
2501 void* os::user_handler() {
2502 return CAST_FROM_FN_PTR(void*, UserHandler);
2503 }
2505 class Semaphore : public StackObj {
2506 public:
2507 Semaphore();
2508 ~Semaphore();
2509 void signal();
2510 void wait();
2511 bool trywait();
2512 bool timedwait(unsigned int sec, int nsec);
2513 private:
2514 sema_t _semaphore;
2515 };
2518 Semaphore::Semaphore() {
2519 sema_init(&_semaphore, 0, NULL, NULL);
2520 }
2522 Semaphore::~Semaphore() {
2523 sema_destroy(&_semaphore);
2524 }
2526 void Semaphore::signal() {
2527 sema_post(&_semaphore);
2528 }
2530 void Semaphore::wait() {
2531 sema_wait(&_semaphore);
2532 }
2534 bool Semaphore::trywait() {
2535 return sema_trywait(&_semaphore) == 0;
2536 }
2538 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2539 struct timespec ts;
2540 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2542 while (1) {
2543 int result = sema_timedwait(&_semaphore, &ts);
2544 if (result == 0) {
2545 return true;
2546 } else if (errno == EINTR) {
2547 continue;
2548 } else if (errno == ETIME) {
2549 return false;
2550 } else {
2551 return false;
2552 }
2553 }
2554 }
2556 extern "C" {
2557 typedef void (*sa_handler_t)(int);
2558 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2559 }
2561 void* os::signal(int signal_number, void* handler) {
2562 struct sigaction sigAct, oldSigAct;
2563 sigfillset(&(sigAct.sa_mask));
2564 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2565 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2567 if (sigaction(signal_number, &sigAct, &oldSigAct))
2568 // -1 means registration failed
2569 return (void *)-1;
2571 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2572 }
2574 void os::signal_raise(int signal_number) {
2575 raise(signal_number);
2576 }
2578 /*
2579 * The following code is moved from os.cpp for making this
2580 * code platform specific, which it is by its very nature.
2581 */
2583 // a counter for each possible signal value
2584 static int Sigexit = 0;
2585 static int Maxlibjsigsigs;
2586 static jint *pending_signals = NULL;
2587 static int *preinstalled_sigs = NULL;
2588 static struct sigaction *chainedsigactions = NULL;
2589 static sema_t sig_sem;
2590 typedef int (*version_getting_t)();
2591 version_getting_t os::Solaris::get_libjsig_version = NULL;
2592 static int libjsigversion = NULL;
2594 int os::sigexitnum_pd() {
2595 assert(Sigexit > 0, "signal memory not yet initialized");
2596 return Sigexit;
2597 }
2599 void os::Solaris::init_signal_mem() {
2600 // Initialize signal structures
2601 Maxsignum = SIGRTMAX;
2602 Sigexit = Maxsignum+1;
2603 assert(Maxsignum >0, "Unable to obtain max signal number");
2605 Maxlibjsigsigs = Maxsignum;
2607 // pending_signals has one int per signal
2608 // The additional signal is for SIGEXIT - exit signal to signal_thread
2609 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2610 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2612 if (UseSignalChaining) {
2613 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2614 * (Maxsignum + 1), mtInternal);
2615 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2616 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2617 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2618 }
2619 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2620 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2621 }
2623 void os::signal_init_pd() {
2624 int ret;
2626 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2627 assert(ret == 0, "sema_init() failed");
2628 }
2630 void os::signal_notify(int signal_number) {
2631 int ret;
2633 Atomic::inc(&pending_signals[signal_number]);
2634 ret = ::sema_post(&sig_sem);
2635 assert(ret == 0, "sema_post() failed");
2636 }
2638 static int check_pending_signals(bool wait_for_signal) {
2639 int ret;
2640 while (true) {
2641 for (int i = 0; i < Sigexit + 1; i++) {
2642 jint n = pending_signals[i];
2643 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2644 return i;
2645 }
2646 }
2647 if (!wait_for_signal) {
2648 return -1;
2649 }
2650 JavaThread *thread = JavaThread::current();
2651 ThreadBlockInVM tbivm(thread);
2653 bool threadIsSuspended;
2654 do {
2655 thread->set_suspend_equivalent();
2656 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2657 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2658 ;
2659 assert(ret == 0, "sema_wait() failed");
2661 // were we externally suspended while we were waiting?
2662 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2663 if (threadIsSuspended) {
2664 //
2665 // The semaphore has been incremented, but while we were waiting
2666 // another thread suspended us. We don't want to continue running
2667 // while suspended because that would surprise the thread that
2668 // suspended us.
2669 //
2670 ret = ::sema_post(&sig_sem);
2671 assert(ret == 0, "sema_post() failed");
2673 thread->java_suspend_self();
2674 }
2675 } while (threadIsSuspended);
2676 }
2677 }
2679 int os::signal_lookup() {
2680 return check_pending_signals(false);
2681 }
2683 int os::signal_wait() {
2684 return check_pending_signals(true);
2685 }
2687 ////////////////////////////////////////////////////////////////////////////////
2688 // Virtual Memory
2690 static int page_size = -1;
2692 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2693 // clear this var if support is not available.
2694 static bool has_map_align = true;
2696 int os::vm_page_size() {
2697 assert(page_size != -1, "must call os::init");
2698 return page_size;
2699 }
2701 // Solaris allocates memory by pages.
2702 int os::vm_allocation_granularity() {
2703 assert(page_size != -1, "must call os::init");
2704 return page_size;
2705 }
2707 static bool recoverable_mmap_error(int err) {
2708 // See if the error is one we can let the caller handle. This
2709 // list of errno values comes from the Solaris mmap(2) man page.
2710 switch (err) {
2711 case EBADF:
2712 case EINVAL:
2713 case ENOTSUP:
2714 // let the caller deal with these errors
2715 return true;
2717 default:
2718 // Any remaining errors on this OS can cause our reserved mapping
2719 // to be lost. That can cause confusion where different data
2720 // structures think they have the same memory mapped. The worst
2721 // scenario is if both the VM and a library think they have the
2722 // same memory mapped.
2723 return false;
2724 }
2725 }
2727 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2728 int err) {
2729 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2730 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2731 strerror(err), err);
2732 }
2734 static void warn_fail_commit_memory(char* addr, size_t bytes,
2735 size_t alignment_hint, bool exec,
2736 int err) {
2737 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2738 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2739 alignment_hint, exec, strerror(err), err);
2740 }
2742 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2743 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2744 size_t size = bytes;
2745 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2746 if (res != NULL) {
2747 if (UseNUMAInterleaving) {
2748 numa_make_global(addr, bytes);
2749 }
2750 return 0;
2751 }
2753 int err = errno; // save errno from mmap() call in mmap_chunk()
2755 if (!recoverable_mmap_error(err)) {
2756 warn_fail_commit_memory(addr, bytes, exec, err);
2757 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2758 }
2760 return err;
2761 }
2763 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2764 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2765 }
2767 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2768 const char* mesg) {
2769 assert(mesg != NULL, "mesg must be specified");
2770 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2771 if (err != 0) {
2772 // the caller wants all commit errors to exit with the specified mesg:
2773 warn_fail_commit_memory(addr, bytes, exec, err);
2774 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2775 }
2776 }
2778 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2779 size_t alignment_hint, bool exec) {
2780 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2781 if (err == 0) {
2782 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) {
2783 // If the large page size has been set and the VM
2784 // is using large pages, use the large page size
2785 // if it is smaller than the alignment hint. This is
2786 // a case where the VM wants to use a larger alignment size
2787 // for its own reasons but still want to use large pages
2788 // (which is what matters to setting the mpss range.
2789 size_t page_size = 0;
2790 if (large_page_size() < alignment_hint) {
2791 assert(UseLargePages, "Expected to be here for large page use only");
2792 page_size = large_page_size();
2793 } else {
2794 // If the alignment hint is less than the large page
2795 // size, the VM wants a particular alignment (thus the hint)
2796 // for internal reasons. Try to set the mpss range using
2797 // the alignment_hint.
2798 page_size = alignment_hint;
2799 }
2800 // Since this is a hint, ignore any failures.
2801 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2802 }
2803 }
2804 return err;
2805 }
2807 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2808 bool exec) {
2809 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2810 }
2812 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2813 size_t alignment_hint, bool exec,
2814 const char* mesg) {
2815 assert(mesg != NULL, "mesg must be specified");
2816 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2817 if (err != 0) {
2818 // the caller wants all commit errors to exit with the specified mesg:
2819 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2820 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2821 }
2822 }
2824 // Uncommit the pages in a specified region.
2825 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2826 if (madvise(addr, bytes, MADV_FREE) < 0) {
2827 debug_only(warning("MADV_FREE failed."));
2828 return;
2829 }
2830 }
2832 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2833 return os::commit_memory(addr, size, !ExecMem);
2834 }
2836 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2837 return os::uncommit_memory(addr, size);
2838 }
2840 // Change the page size in a given range.
2841 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2842 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2843 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2844 if (UseLargePages) {
2845 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2846 }
2847 }
2849 // Tell the OS to make the range local to the first-touching LWP
2850 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2851 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2852 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2853 debug_only(warning("MADV_ACCESS_LWP failed."));
2854 }
2855 }
2857 // Tell the OS that this range would be accessed from different LWPs.
2858 void os::numa_make_global(char *addr, size_t bytes) {
2859 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2860 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2861 debug_only(warning("MADV_ACCESS_MANY failed."));
2862 }
2863 }
2865 // Get the number of the locality groups.
2866 size_t os::numa_get_groups_num() {
2867 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2868 return n != -1 ? n : 1;
2869 }
2871 // Get a list of leaf locality groups. A leaf lgroup is group that
2872 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2873 // board. An LWP is assigned to one of these groups upon creation.
2874 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2875 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2876 ids[0] = 0;
2877 return 1;
2878 }
2879 int result_size = 0, top = 1, bottom = 0, cur = 0;
2880 for (int k = 0; k < size; k++) {
2881 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2882 (Solaris::lgrp_id_t*)&ids[top], size - top);
2883 if (r == -1) {
2884 ids[0] = 0;
2885 return 1;
2886 }
2887 if (!r) {
2888 // That's a leaf node.
2889 assert (bottom <= cur, "Sanity check");
2890 // Check if the node has memory
2891 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2892 NULL, 0, LGRP_RSRC_MEM) > 0) {
2893 ids[bottom++] = ids[cur];
2894 }
2895 }
2896 top += r;
2897 cur++;
2898 }
2899 if (bottom == 0) {
2900 // Handle a situation, when the OS reports no memory available.
2901 // Assume UMA architecture.
2902 ids[0] = 0;
2903 return 1;
2904 }
2905 return bottom;
2906 }
2908 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2909 bool os::numa_topology_changed() {
2910 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2911 if (is_stale != -1 && is_stale) {
2912 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2913 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2914 assert(c != 0, "Failure to initialize LGRP API");
2915 Solaris::set_lgrp_cookie(c);
2916 return true;
2917 }
2918 return false;
2919 }
2921 // Get the group id of the current LWP.
2922 int os::numa_get_group_id() {
2923 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2924 if (lgrp_id == -1) {
2925 return 0;
2926 }
2927 const int size = os::numa_get_groups_num();
2928 int *ids = (int*)alloca(size * sizeof(int));
2930 // Get the ids of all lgroups with memory; r is the count.
2931 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2932 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2933 if (r <= 0) {
2934 return 0;
2935 }
2936 return ids[os::random() % r];
2937 }
2939 // Request information about the page.
2940 bool os::get_page_info(char *start, page_info* info) {
2941 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2942 uint64_t addr = (uintptr_t)start;
2943 uint64_t outdata[2];
2944 uint_t validity = 0;
2946 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2947 return false;
2948 }
2950 info->size = 0;
2951 info->lgrp_id = -1;
2953 if ((validity & 1) != 0) {
2954 if ((validity & 2) != 0) {
2955 info->lgrp_id = outdata[0];
2956 }
2957 if ((validity & 4) != 0) {
2958 info->size = outdata[1];
2959 }
2960 return true;
2961 }
2962 return false;
2963 }
2965 // Scan the pages from start to end until a page different than
2966 // the one described in the info parameter is encountered.
2967 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2968 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2969 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2970 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2971 uint_t validity[MAX_MEMINFO_CNT];
2973 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2974 uint64_t p = (uint64_t)start;
2975 while (p < (uint64_t)end) {
2976 addrs[0] = p;
2977 size_t addrs_count = 1;
2978 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2979 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2980 addrs_count++;
2981 }
2983 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2984 return NULL;
2985 }
2987 size_t i = 0;
2988 for (; i < addrs_count; i++) {
2989 if ((validity[i] & 1) != 0) {
2990 if ((validity[i] & 4) != 0) {
2991 if (outdata[types * i + 1] != page_expected->size) {
2992 break;
2993 }
2994 } else
2995 if (page_expected->size != 0) {
2996 break;
2997 }
2999 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
3000 if (outdata[types * i] != page_expected->lgrp_id) {
3001 break;
3002 }
3003 }
3004 } else {
3005 return NULL;
3006 }
3007 }
3009 if (i != addrs_count) {
3010 if ((validity[i] & 2) != 0) {
3011 page_found->lgrp_id = outdata[types * i];
3012 } else {
3013 page_found->lgrp_id = -1;
3014 }
3015 if ((validity[i] & 4) != 0) {
3016 page_found->size = outdata[types * i + 1];
3017 } else {
3018 page_found->size = 0;
3019 }
3020 return (char*)addrs[i];
3021 }
3023 p = addrs[addrs_count - 1] + page_size;
3024 }
3025 return end;
3026 }
3028 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3029 size_t size = bytes;
3030 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3031 // uncommitted page. Otherwise, the read/write might succeed if we
3032 // have enough swap space to back the physical page.
3033 return
3034 NULL != Solaris::mmap_chunk(addr, size,
3035 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
3036 PROT_NONE);
3037 }
3039 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
3040 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
3042 if (b == MAP_FAILED) {
3043 return NULL;
3044 }
3045 return b;
3046 }
3048 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3049 char* addr = requested_addr;
3050 int flags = MAP_PRIVATE | MAP_NORESERVE;
3052 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3054 if (fixed) {
3055 flags |= MAP_FIXED;
3056 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3057 flags |= MAP_ALIGN;
3058 addr = (char*) alignment_hint;
3059 }
3061 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3062 // uncommitted page. Otherwise, the read/write might succeed if we
3063 // have enough swap space to back the physical page.
3064 return mmap_chunk(addr, bytes, flags, PROT_NONE);
3065 }
3067 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3068 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3070 guarantee(requested_addr == NULL || requested_addr == addr,
3071 "OS failed to return requested mmap address.");
3072 return addr;
3073 }
3075 // Reserve memory at an arbitrary address, only if that area is
3076 // available (and not reserved for something else).
3078 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3079 const int max_tries = 10;
3080 char* base[max_tries];
3081 size_t size[max_tries];
3083 // Solaris adds a gap between mmap'ed regions. The size of the gap
3084 // is dependent on the requested size and the MMU. Our initial gap
3085 // value here is just a guess and will be corrected later.
3086 bool had_top_overlap = false;
3087 bool have_adjusted_gap = false;
3088 size_t gap = 0x400000;
3090 // Assert only that the size is a multiple of the page size, since
3091 // that's all that mmap requires, and since that's all we really know
3092 // about at this low abstraction level. If we need higher alignment,
3093 // we can either pass an alignment to this method or verify alignment
3094 // in one of the methods further up the call chain. See bug 5044738.
3095 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3097 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3098 // Give it a try, if the kernel honors the hint we can return immediately.
3099 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3101 volatile int err = errno;
3102 if (addr == requested_addr) {
3103 return addr;
3104 } else if (addr != NULL) {
3105 pd_unmap_memory(addr, bytes);
3106 }
3108 if (PrintMiscellaneous && Verbose) {
3109 char buf[256];
3110 buf[0] = '\0';
3111 if (addr == NULL) {
3112 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3113 }
3114 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3115 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3116 "%s", bytes, requested_addr, addr, buf);
3117 }
3119 // Address hint method didn't work. Fall back to the old method.
3120 // In theory, once SNV becomes our oldest supported platform, this
3121 // code will no longer be needed.
3122 //
3123 // Repeatedly allocate blocks until the block is allocated at the
3124 // right spot. Give up after max_tries.
3125 int i;
3126 for (i = 0; i < max_tries; ++i) {
3127 base[i] = reserve_memory(bytes);
3129 if (base[i] != NULL) {
3130 // Is this the block we wanted?
3131 if (base[i] == requested_addr) {
3132 size[i] = bytes;
3133 break;
3134 }
3136 // check that the gap value is right
3137 if (had_top_overlap && !have_adjusted_gap) {
3138 size_t actual_gap = base[i-1] - base[i] - bytes;
3139 if (gap != actual_gap) {
3140 // adjust the gap value and retry the last 2 allocations
3141 assert(i > 0, "gap adjustment code problem");
3142 have_adjusted_gap = true; // adjust the gap only once, just in case
3143 gap = actual_gap;
3144 if (PrintMiscellaneous && Verbose) {
3145 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3146 }
3147 unmap_memory(base[i], bytes);
3148 unmap_memory(base[i-1], size[i-1]);
3149 i-=2;
3150 continue;
3151 }
3152 }
3154 // Does this overlap the block we wanted? Give back the overlapped
3155 // parts and try again.
3156 //
3157 // There is still a bug in this code: if top_overlap == bytes,
3158 // the overlap is offset from requested region by the value of gap.
3159 // In this case giving back the overlapped part will not work,
3160 // because we'll give back the entire block at base[i] and
3161 // therefore the subsequent allocation will not generate a new gap.
3162 // This could be fixed with a new algorithm that used larger
3163 // or variable size chunks to find the requested region -
3164 // but such a change would introduce additional complications.
3165 // It's rare enough that the planets align for this bug,
3166 // so we'll just wait for a fix for 6204603/5003415 which
3167 // will provide a mmap flag to allow us to avoid this business.
3169 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3170 if (top_overlap >= 0 && top_overlap < bytes) {
3171 had_top_overlap = true;
3172 unmap_memory(base[i], top_overlap);
3173 base[i] += top_overlap;
3174 size[i] = bytes - top_overlap;
3175 } else {
3176 size_t bottom_overlap = base[i] + bytes - requested_addr;
3177 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3178 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3179 warning("attempt_reserve_memory_at: possible alignment bug");
3180 }
3181 unmap_memory(requested_addr, bottom_overlap);
3182 size[i] = bytes - bottom_overlap;
3183 } else {
3184 size[i] = bytes;
3185 }
3186 }
3187 }
3188 }
3190 // Give back the unused reserved pieces.
3192 for (int j = 0; j < i; ++j) {
3193 if (base[j] != NULL) {
3194 unmap_memory(base[j], size[j]);
3195 }
3196 }
3198 return (i < max_tries) ? requested_addr : NULL;
3199 }
3201 bool os::pd_release_memory(char* addr, size_t bytes) {
3202 size_t size = bytes;
3203 return munmap(addr, size) == 0;
3204 }
3206 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3207 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3208 "addr must be page aligned");
3209 int retVal = mprotect(addr, bytes, prot);
3210 return retVal == 0;
3211 }
3213 // Protect memory (Used to pass readonly pages through
3214 // JNI GetArray<type>Elements with empty arrays.)
3215 // Also, used for serialization page and for compressed oops null pointer
3216 // checking.
3217 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3218 bool is_committed) {
3219 unsigned int p = 0;
3220 switch (prot) {
3221 case MEM_PROT_NONE: p = PROT_NONE; break;
3222 case MEM_PROT_READ: p = PROT_READ; break;
3223 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3224 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3225 default:
3226 ShouldNotReachHere();
3227 }
3228 // is_committed is unused.
3229 return solaris_mprotect(addr, bytes, p);
3230 }
3232 // guard_memory and unguard_memory only happens within stack guard pages.
3233 // Since ISM pertains only to the heap, guard and unguard memory should not
3234 /// happen with an ISM region.
3235 bool os::guard_memory(char* addr, size_t bytes) {
3236 return solaris_mprotect(addr, bytes, PROT_NONE);
3237 }
3239 bool os::unguard_memory(char* addr, size_t bytes) {
3240 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3241 }
3243 // Large page support
3244 static size_t _large_page_size = 0;
3246 // Insertion sort for small arrays (descending order).
3247 static void insertion_sort_descending(size_t* array, int len) {
3248 for (int i = 0; i < len; i++) {
3249 size_t val = array[i];
3250 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3251 size_t tmp = array[key];
3252 array[key] = array[key - 1];
3253 array[key - 1] = tmp;
3254 }
3255 }
3256 }
3258 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3259 const unsigned int usable_count = VM_Version::page_size_count();
3260 if (usable_count == 1) {
3261 return false;
3262 }
3264 // Find the right getpagesizes interface. When solaris 11 is the minimum
3265 // build platform, getpagesizes() (without the '2') can be called directly.
3266 typedef int (*gps_t)(size_t[], int);
3267 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3268 if (gps_func == NULL) {
3269 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3270 if (gps_func == NULL) {
3271 if (warn) {
3272 warning("MPSS is not supported by the operating system.");
3273 }
3274 return false;
3275 }
3276 }
3278 // Fill the array of page sizes.
3279 int n = (*gps_func)(_page_sizes, page_sizes_max);
3280 assert(n > 0, "Solaris bug?");
3282 if (n == page_sizes_max) {
3283 // Add a sentinel value (necessary only if the array was completely filled
3284 // since it is static (zeroed at initialization)).
3285 _page_sizes[--n] = 0;
3286 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3287 }
3288 assert(_page_sizes[n] == 0, "missing sentinel");
3289 trace_page_sizes("available page sizes", _page_sizes, n);
3291 if (n == 1) return false; // Only one page size available.
3293 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3294 // select up to usable_count elements. First sort the array, find the first
3295 // acceptable value, then copy the usable sizes to the top of the array and
3296 // trim the rest. Make sure to include the default page size :-).
3297 //
3298 // A better policy could get rid of the 4M limit by taking the sizes of the
3299 // important VM memory regions (java heap and possibly the code cache) into
3300 // account.
3301 insertion_sort_descending(_page_sizes, n);
3302 const size_t size_limit =
3303 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3304 int beg;
3305 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3306 const int end = MIN2((int)usable_count, n) - 1;
3307 for (int cur = 0; cur < end; ++cur, ++beg) {
3308 _page_sizes[cur] = _page_sizes[beg];
3309 }
3310 _page_sizes[end] = vm_page_size();
3311 _page_sizes[end + 1] = 0;
3313 if (_page_sizes[end] > _page_sizes[end - 1]) {
3314 // Default page size is not the smallest; sort again.
3315 insertion_sort_descending(_page_sizes, end + 1);
3316 }
3317 *page_size = _page_sizes[0];
3319 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3320 return true;
3321 }
3323 void os::large_page_init() {
3324 if (UseLargePages) {
3325 // print a warning if any large page related flag is specified on command line
3326 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3327 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3329 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3330 }
3331 }
3333 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3334 // Signal to OS that we want large pages for addresses
3335 // from addr, addr + bytes
3336 struct memcntl_mha mpss_struct;
3337 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3338 mpss_struct.mha_pagesize = align;
3339 mpss_struct.mha_flags = 0;
3340 // Upon successful completion, memcntl() returns 0
3341 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3342 debug_only(warning("Attempt to use MPSS failed."));
3343 return false;
3344 }
3345 return true;
3346 }
3348 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3349 fatal("os::reserve_memory_special should not be called on Solaris.");
3350 return NULL;
3351 }
3353 bool os::release_memory_special(char* base, size_t bytes) {
3354 fatal("os::release_memory_special should not be called on Solaris.");
3355 return false;
3356 }
3358 size_t os::large_page_size() {
3359 return _large_page_size;
3360 }
3362 // MPSS allows application to commit large page memory on demand; with ISM
3363 // the entire memory region must be allocated as shared memory.
3364 bool os::can_commit_large_page_memory() {
3365 return true;
3366 }
3368 bool os::can_execute_large_page_memory() {
3369 return true;
3370 }
3372 static int os_sleep(jlong millis, bool interruptible) {
3373 const jlong limit = INT_MAX;
3374 jlong prevtime;
3375 int res;
3377 while (millis > limit) {
3378 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3379 return res;
3380 millis -= limit;
3381 }
3383 // Restart interrupted polls with new parameters until the proper delay
3384 // has been completed.
3386 prevtime = getTimeMillis();
3388 while (millis > 0) {
3389 jlong newtime;
3391 if (!interruptible) {
3392 // Following assert fails for os::yield_all:
3393 // assert(!thread->is_Java_thread(), "must not be java thread");
3394 res = poll(NULL, 0, millis);
3395 } else {
3396 JavaThread *jt = JavaThread::current();
3398 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3399 os::Solaris::clear_interrupted);
3400 }
3402 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3403 // thread.Interrupt.
3405 // See c/r 6751923. Poll can return 0 before time
3406 // has elapsed if time is set via clock_settime (as NTP does).
3407 // res == 0 if poll timed out (see man poll RETURN VALUES)
3408 // using the logic below checks that we really did
3409 // sleep at least "millis" if not we'll sleep again.
3410 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3411 newtime = getTimeMillis();
3412 assert(newtime >= prevtime, "time moving backwards");
3413 /* Doing prevtime and newtime in microseconds doesn't help precision,
3414 and trying to round up to avoid lost milliseconds can result in a
3415 too-short delay. */
3416 millis -= newtime - prevtime;
3417 if(millis <= 0)
3418 return OS_OK;
3419 prevtime = newtime;
3420 } else
3421 return res;
3422 }
3424 return OS_OK;
3425 }
3427 // Read calls from inside the vm need to perform state transitions
3428 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3429 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3430 }
3432 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3433 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3434 }
3436 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3437 assert(thread == Thread::current(), "thread consistency check");
3439 // TODO-FIXME: this should be removed.
3440 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3441 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3442 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3443 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3444 // is fooled into believing that the system is making progress. In the code below we block the
3445 // the watcher thread while safepoint is in progress so that it would not appear as though the
3446 // system is making progress.
3447 if (!Solaris::T2_libthread() &&
3448 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3449 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3450 // the entire safepoint, the watcher thread will line up here during the safepoint.
3451 Threads_lock->lock_without_safepoint_check();
3452 Threads_lock->unlock();
3453 }
3455 if (thread->is_Java_thread()) {
3456 // This is a JavaThread so we honor the _thread_blocked protocol
3457 // even for sleeps of 0 milliseconds. This was originally done
3458 // as a workaround for bug 4338139. However, now we also do it
3459 // to honor the suspend-equivalent protocol.
3461 JavaThread *jt = (JavaThread *) thread;
3462 ThreadBlockInVM tbivm(jt);
3464 jt->set_suspend_equivalent();
3465 // cleared by handle_special_suspend_equivalent_condition() or
3466 // java_suspend_self() via check_and_wait_while_suspended()
3468 int ret_code;
3469 if (millis <= 0) {
3470 thr_yield();
3471 ret_code = 0;
3472 } else {
3473 // The original sleep() implementation did not create an
3474 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3475 // I'm preserving that decision for now.
3476 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3478 ret_code = os_sleep(millis, interruptible);
3479 }
3481 // were we externally suspended while we were waiting?
3482 jt->check_and_wait_while_suspended();
3484 return ret_code;
3485 }
3487 // non-JavaThread from this point on:
3489 if (millis <= 0) {
3490 thr_yield();
3491 return 0;
3492 }
3494 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3496 return os_sleep(millis, interruptible);
3497 }
3499 int os::naked_sleep() {
3500 // %% make the sleep time an integer flag. for now use 1 millisec.
3501 return os_sleep(1, false);
3502 }
3504 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3505 void os::infinite_sleep() {
3506 while (true) { // sleep forever ...
3507 ::sleep(100); // ... 100 seconds at a time
3508 }
3509 }
3511 // Used to convert frequent JVM_Yield() to nops
3512 bool os::dont_yield() {
3513 if (DontYieldALot) {
3514 static hrtime_t last_time = 0;
3515 hrtime_t diff = getTimeNanos() - last_time;
3517 if (diff < DontYieldALotInterval * 1000000)
3518 return true;
3520 last_time += diff;
3522 return false;
3523 }
3524 else {
3525 return false;
3526 }
3527 }
3529 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3530 // the linux and win32 implementations do not. This should be checked.
3532 void os::yield() {
3533 // Yields to all threads with same or greater priority
3534 os::sleep(Thread::current(), 0, false);
3535 }
3537 // Note that yield semantics are defined by the scheduling class to which
3538 // the thread currently belongs. Typically, yield will _not yield to
3539 // other equal or higher priority threads that reside on the dispatch queues
3540 // of other CPUs.
3542 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3545 // On Solaris we found that yield_all doesn't always yield to all other threads.
3546 // There have been cases where there is a thread ready to execute but it doesn't
3547 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3548 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3549 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3550 // number of times yield_all is called in the one loop and increase the sleep
3551 // time after 8 attempts. If this fails too we increase the concurrency level
3552 // so that the starving thread would get an lwp
3554 void os::yield_all(int attempts) {
3555 // Yields to all threads, including threads with lower priorities
3556 if (attempts == 0) {
3557 os::sleep(Thread::current(), 1, false);
3558 } else {
3559 int iterations = attempts % 30;
3560 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3561 // thr_setconcurrency and _getconcurrency make sense only under T1.
3562 int noofLWPS = thr_getconcurrency();
3563 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3564 thr_setconcurrency(thr_getconcurrency() + 1);
3565 }
3566 } else if (iterations < 25) {
3567 os::sleep(Thread::current(), 1, false);
3568 } else {
3569 os::sleep(Thread::current(), 10, false);
3570 }
3571 }
3572 }
3574 // Called from the tight loops to possibly influence time-sharing heuristics
3575 void os::loop_breaker(int attempts) {
3576 os::yield_all(attempts);
3577 }
3580 // Interface for setting lwp priorities. If we are using T2 libthread,
3581 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3582 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3583 // function is meaningless in this mode so we must adjust the real lwp's priority
3584 // The routines below implement the getting and setting of lwp priorities.
3585 //
3586 // Note: There are three priority scales used on Solaris. Java priotities
3587 // which range from 1 to 10, libthread "thr_setprio" scale which range
3588 // from 0 to 127, and the current scheduling class of the process we
3589 // are running in. This is typically from -60 to +60.
3590 // The setting of the lwp priorities in done after a call to thr_setprio
3591 // so Java priorities are mapped to libthread priorities and we map from
3592 // the latter to lwp priorities. We don't keep priorities stored in
3593 // Java priorities since some of our worker threads want to set priorities
3594 // higher than all Java threads.
3595 //
3596 // For related information:
3597 // (1) man -s 2 priocntl
3598 // (2) man -s 4 priocntl
3599 // (3) man dispadmin
3600 // = librt.so
3601 // = libthread/common/rtsched.c - thrp_setlwpprio().
3602 // = ps -cL <pid> ... to validate priority.
3603 // = sched_get_priority_min and _max
3604 // pthread_create
3605 // sched_setparam
3606 // pthread_setschedparam
3607 //
3608 // Assumptions:
3609 // + We assume that all threads in the process belong to the same
3610 // scheduling class. IE. an homogenous process.
3611 // + Must be root or in IA group to change change "interactive" attribute.
3612 // Priocntl() will fail silently. The only indication of failure is when
3613 // we read-back the value and notice that it hasn't changed.
3614 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3615 // + For RT, change timeslice as well. Invariant:
3616 // constant "priority integral"
3617 // Konst == TimeSlice * (60-Priority)
3618 // Given a priority, compute appropriate timeslice.
3619 // + Higher numerical values have higher priority.
3621 // sched class attributes
3622 typedef struct {
3623 int schedPolicy; // classID
3624 int maxPrio;
3625 int minPrio;
3626 } SchedInfo;
3629 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3631 #ifdef ASSERT
3632 static int ReadBackValidate = 1;
3633 #endif
3634 static int myClass = 0;
3635 static int myMin = 0;
3636 static int myMax = 0;
3637 static int myCur = 0;
3638 static bool priocntl_enable = false;
3640 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3641 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3644 // lwp_priocntl_init
3645 //
3646 // Try to determine the priority scale for our process.
3647 //
3648 // Return errno or 0 if OK.
3649 //
3650 static int lwp_priocntl_init () {
3651 int rslt;
3652 pcinfo_t ClassInfo;
3653 pcparms_t ParmInfo;
3654 int i;
3656 if (!UseThreadPriorities) return 0;
3658 // We are using Bound threads, we need to determine our priority ranges
3659 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3660 // If ThreadPriorityPolicy is 1, switch tables
3661 if (ThreadPriorityPolicy == 1) {
3662 for (i = 0 ; i < CriticalPriority+1; i++)
3663 os::java_to_os_priority[i] = prio_policy1[i];
3664 }
3665 if (UseCriticalJavaThreadPriority) {
3666 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3667 // See set_native_priority() and set_lwp_class_and_priority().
3668 // Save original MaxPriority mapping in case attempt to
3669 // use critical priority fails.
3670 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3671 // Set negative to distinguish from other priorities
3672 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3673 }
3674 }
3675 // Not using Bound Threads, set to ThreadPolicy 1
3676 else {
3677 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3678 os::java_to_os_priority[i] = prio_policy1[i];
3679 }
3680 return 0;
3681 }
3683 // Get IDs for a set of well-known scheduling classes.
3684 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3685 // the system. We should have a loop that iterates over the
3686 // classID values, which are known to be "small" integers.
3688 strcpy(ClassInfo.pc_clname, "TS");
3689 ClassInfo.pc_cid = -1;
3690 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3691 if (rslt < 0) return errno;
3692 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3693 tsLimits.schedPolicy = ClassInfo.pc_cid;
3694 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3695 tsLimits.minPrio = -tsLimits.maxPrio;
3697 strcpy(ClassInfo.pc_clname, "IA");
3698 ClassInfo.pc_cid = -1;
3699 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3700 if (rslt < 0) return errno;
3701 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3702 iaLimits.schedPolicy = ClassInfo.pc_cid;
3703 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3704 iaLimits.minPrio = -iaLimits.maxPrio;
3706 strcpy(ClassInfo.pc_clname, "RT");
3707 ClassInfo.pc_cid = -1;
3708 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3709 if (rslt < 0) return errno;
3710 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3711 rtLimits.schedPolicy = ClassInfo.pc_cid;
3712 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3713 rtLimits.minPrio = 0;
3715 strcpy(ClassInfo.pc_clname, "FX");
3716 ClassInfo.pc_cid = -1;
3717 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3718 if (rslt < 0) return errno;
3719 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3720 fxLimits.schedPolicy = ClassInfo.pc_cid;
3721 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3722 fxLimits.minPrio = 0;
3724 // Query our "current" scheduling class.
3725 // This will normally be IA, TS or, rarely, FX or RT.
3726 memset(&ParmInfo, 0, sizeof(ParmInfo));
3727 ParmInfo.pc_cid = PC_CLNULL;
3728 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3729 if (rslt < 0) return errno;
3730 myClass = ParmInfo.pc_cid;
3732 // We now know our scheduling classId, get specific information
3733 // about the class.
3734 ClassInfo.pc_cid = myClass;
3735 ClassInfo.pc_clname[0] = 0;
3736 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3737 if (rslt < 0) return errno;
3739 if (ThreadPriorityVerbose) {
3740 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3741 }
3743 memset(&ParmInfo, 0, sizeof(pcparms_t));
3744 ParmInfo.pc_cid = PC_CLNULL;
3745 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3746 if (rslt < 0) return errno;
3748 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3749 myMin = rtLimits.minPrio;
3750 myMax = rtLimits.maxPrio;
3751 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3752 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3753 myMin = iaLimits.minPrio;
3754 myMax = iaLimits.maxPrio;
3755 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3756 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3757 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3758 myMin = tsLimits.minPrio;
3759 myMax = tsLimits.maxPrio;
3760 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3761 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3762 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3763 myMin = fxLimits.minPrio;
3764 myMax = fxLimits.maxPrio;
3765 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3766 } else {
3767 // No clue - punt
3768 if (ThreadPriorityVerbose)
3769 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3770 return EINVAL; // no clue, punt
3771 }
3773 if (ThreadPriorityVerbose) {
3774 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3775 }
3777 priocntl_enable = true; // Enable changing priorities
3778 return 0;
3779 }
3781 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3782 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3783 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3784 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3787 // scale_to_lwp_priority
3788 //
3789 // Convert from the libthread "thr_setprio" scale to our current
3790 // lwp scheduling class scale.
3791 //
3792 static
3793 int scale_to_lwp_priority (int rMin, int rMax, int x)
3794 {
3795 int v;
3797 if (x == 127) return rMax; // avoid round-down
3798 v = (((x*(rMax-rMin)))/128)+rMin;
3799 return v;
3800 }
3803 // set_lwp_class_and_priority
3804 //
3805 // Set the class and priority of the lwp. This call should only
3806 // be made when using bound threads (T2 threads are bound by default).
3807 //
3808 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3809 int newPrio, int new_class, bool scale) {
3810 int rslt;
3811 int Actual, Expected, prv;
3812 pcparms_t ParmInfo; // for GET-SET
3813 #ifdef ASSERT
3814 pcparms_t ReadBack; // for readback
3815 #endif
3817 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3818 // Query current values.
3819 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3820 // Cache "pcparms_t" in global ParmCache.
3821 // TODO: elide set-to-same-value
3823 // If something went wrong on init, don't change priorities.
3824 if ( !priocntl_enable ) {
3825 if (ThreadPriorityVerbose)
3826 tty->print_cr("Trying to set priority but init failed, ignoring");
3827 return EINVAL;
3828 }
3830 // If lwp hasn't started yet, just return
3831 // the _start routine will call us again.
3832 if ( lwpid <= 0 ) {
3833 if (ThreadPriorityVerbose) {
3834 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3835 INTPTR_FORMAT " to %d, lwpid not set",
3836 ThreadID, newPrio);
3837 }
3838 return 0;
3839 }
3841 if (ThreadPriorityVerbose) {
3842 tty->print_cr ("set_lwp_class_and_priority("
3843 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3844 ThreadID, lwpid, newPrio);
3845 }
3847 memset(&ParmInfo, 0, sizeof(pcparms_t));
3848 ParmInfo.pc_cid = PC_CLNULL;
3849 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3850 if (rslt < 0) return errno;
3852 int cur_class = ParmInfo.pc_cid;
3853 ParmInfo.pc_cid = (id_t)new_class;
3855 if (new_class == rtLimits.schedPolicy) {
3856 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3857 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3858 rtLimits.maxPrio, newPrio)
3859 : newPrio;
3860 rtInfo->rt_tqsecs = RT_NOCHANGE;
3861 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3862 if (ThreadPriorityVerbose) {
3863 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3864 }
3865 } else if (new_class == iaLimits.schedPolicy) {
3866 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3867 int maxClamped = MIN2(iaLimits.maxPrio,
3868 cur_class == new_class
3869 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3870 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3871 maxClamped, newPrio)
3872 : newPrio;
3873 iaInfo->ia_uprilim = cur_class == new_class
3874 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3875 iaInfo->ia_mode = IA_NOCHANGE;
3876 if (ThreadPriorityVerbose) {
3877 tty->print_cr("IA: [%d...%d] %d->%d\n",
3878 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3879 }
3880 } else if (new_class == tsLimits.schedPolicy) {
3881 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3882 int maxClamped = MIN2(tsLimits.maxPrio,
3883 cur_class == new_class
3884 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3885 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3886 maxClamped, newPrio)
3887 : newPrio;
3888 tsInfo->ts_uprilim = cur_class == new_class
3889 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3890 if (ThreadPriorityVerbose) {
3891 tty->print_cr("TS: [%d...%d] %d->%d\n",
3892 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3893 }
3894 } else if (new_class == fxLimits.schedPolicy) {
3895 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3896 int maxClamped = MIN2(fxLimits.maxPrio,
3897 cur_class == new_class
3898 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3899 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3900 maxClamped, newPrio)
3901 : newPrio;
3902 fxInfo->fx_uprilim = cur_class == new_class
3903 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3904 fxInfo->fx_tqsecs = FX_NOCHANGE;
3905 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3906 if (ThreadPriorityVerbose) {
3907 tty->print_cr("FX: [%d...%d] %d->%d\n",
3908 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3909 }
3910 } else {
3911 if (ThreadPriorityVerbose) {
3912 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3913 }
3914 return EINVAL; // no clue, punt
3915 }
3917 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3918 if (ThreadPriorityVerbose && rslt) {
3919 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3920 }
3921 if (rslt < 0) return errno;
3923 #ifdef ASSERT
3924 // Sanity check: read back what we just attempted to set.
3925 // In theory it could have changed in the interim ...
3926 //
3927 // The priocntl system call is tricky.
3928 // Sometimes it'll validate the priority value argument and
3929 // return EINVAL if unhappy. At other times it fails silently.
3930 // Readbacks are prudent.
3932 if (!ReadBackValidate) return 0;
3934 memset(&ReadBack, 0, sizeof(pcparms_t));
3935 ReadBack.pc_cid = PC_CLNULL;
3936 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3937 assert(rslt >= 0, "priocntl failed");
3938 Actual = Expected = 0xBAD;
3939 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3940 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3941 Actual = RTPRI(ReadBack)->rt_pri;
3942 Expected = RTPRI(ParmInfo)->rt_pri;
3943 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3944 Actual = IAPRI(ReadBack)->ia_upri;
3945 Expected = IAPRI(ParmInfo)->ia_upri;
3946 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3947 Actual = TSPRI(ReadBack)->ts_upri;
3948 Expected = TSPRI(ParmInfo)->ts_upri;
3949 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3950 Actual = FXPRI(ReadBack)->fx_upri;
3951 Expected = FXPRI(ParmInfo)->fx_upri;
3952 } else {
3953 if (ThreadPriorityVerbose) {
3954 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3955 ParmInfo.pc_cid);
3956 }
3957 }
3959 if (Actual != Expected) {
3960 if (ThreadPriorityVerbose) {
3961 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3962 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3963 }
3964 }
3965 #endif
3967 return 0;
3968 }
3970 // Solaris only gives access to 128 real priorities at a time,
3971 // so we expand Java's ten to fill this range. This would be better
3972 // if we dynamically adjusted relative priorities.
3973 //
3974 // The ThreadPriorityPolicy option allows us to select 2 different
3975 // priority scales.
3976 //
3977 // ThreadPriorityPolicy=0
3978 // Since the Solaris' default priority is MaximumPriority, we do not
3979 // set a priority lower than Max unless a priority lower than
3980 // NormPriority is requested.
3981 //
3982 // ThreadPriorityPolicy=1
3983 // This mode causes the priority table to get filled with
3984 // linear values. NormPriority get's mapped to 50% of the
3985 // Maximum priority an so on. This will cause VM threads
3986 // to get unfair treatment against other Solaris processes
3987 // which do not explicitly alter their thread priorities.
3988 //
3990 int os::java_to_os_priority[CriticalPriority + 1] = {
3991 -99999, // 0 Entry should never be used
3993 0, // 1 MinPriority
3994 32, // 2
3995 64, // 3
3997 96, // 4
3998 127, // 5 NormPriority
3999 127, // 6
4001 127, // 7
4002 127, // 8
4003 127, // 9 NearMaxPriority
4005 127, // 10 MaxPriority
4007 -criticalPrio // 11 CriticalPriority
4008 };
4010 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4011 OSThread* osthread = thread->osthread();
4013 // Save requested priority in case the thread hasn't been started
4014 osthread->set_native_priority(newpri);
4016 // Check for critical priority request
4017 bool fxcritical = false;
4018 if (newpri == -criticalPrio) {
4019 fxcritical = true;
4020 newpri = criticalPrio;
4021 }
4023 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4024 if (!UseThreadPriorities) return OS_OK;
4026 int status = 0;
4028 if (!fxcritical) {
4029 // Use thr_setprio only if we have a priority that thr_setprio understands
4030 status = thr_setprio(thread->osthread()->thread_id(), newpri);
4031 }
4033 if (os::Solaris::T2_libthread() ||
4034 (UseBoundThreads && osthread->is_vm_created())) {
4035 int lwp_status =
4036 set_lwp_class_and_priority(osthread->thread_id(),
4037 osthread->lwp_id(),
4038 newpri,
4039 fxcritical ? fxLimits.schedPolicy : myClass,
4040 !fxcritical);
4041 if (lwp_status != 0 && fxcritical) {
4042 // Try again, this time without changing the scheduling class
4043 newpri = java_MaxPriority_to_os_priority;
4044 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
4045 osthread->lwp_id(),
4046 newpri, myClass, false);
4047 }
4048 status |= lwp_status;
4049 }
4050 return (status == 0) ? OS_OK : OS_ERR;
4051 }
4054 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4055 int p;
4056 if ( !UseThreadPriorities ) {
4057 *priority_ptr = NormalPriority;
4058 return OS_OK;
4059 }
4060 int status = thr_getprio(thread->osthread()->thread_id(), &p);
4061 if (status != 0) {
4062 return OS_ERR;
4063 }
4064 *priority_ptr = p;
4065 return OS_OK;
4066 }
4069 // Hint to the underlying OS that a task switch would not be good.
4070 // Void return because it's a hint and can fail.
4071 void os::hint_no_preempt() {
4072 schedctl_start(schedctl_init());
4073 }
4075 static void resume_clear_context(OSThread *osthread) {
4076 osthread->set_ucontext(NULL);
4077 }
4079 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
4080 osthread->set_ucontext(context);
4081 }
4083 static Semaphore sr_semaphore;
4085 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
4086 // Save and restore errno to avoid confusing native code with EINTR
4087 // after sigsuspend.
4088 int old_errno = errno;
4090 OSThread* osthread = thread->osthread();
4091 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
4093 os::SuspendResume::State current = osthread->sr.state();
4094 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
4095 suspend_save_context(osthread, uc);
4097 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
4098 os::SuspendResume::State state = osthread->sr.suspended();
4099 if (state == os::SuspendResume::SR_SUSPENDED) {
4100 sigset_t suspend_set; // signals for sigsuspend()
4102 // get current set of blocked signals and unblock resume signal
4103 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
4104 sigdelset(&suspend_set, os::Solaris::SIGasync());
4106 sr_semaphore.signal();
4107 // wait here until we are resumed
4108 while (1) {
4109 sigsuspend(&suspend_set);
4111 os::SuspendResume::State result = osthread->sr.running();
4112 if (result == os::SuspendResume::SR_RUNNING) {
4113 sr_semaphore.signal();
4114 break;
4115 }
4116 }
4118 } else if (state == os::SuspendResume::SR_RUNNING) {
4119 // request was cancelled, continue
4120 } else {
4121 ShouldNotReachHere();
4122 }
4124 resume_clear_context(osthread);
4125 } else if (current == os::SuspendResume::SR_RUNNING) {
4126 // request was cancelled, continue
4127 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
4128 // ignore
4129 } else {
4130 // ignore
4131 }
4133 errno = old_errno;
4134 }
4137 void os::interrupt(Thread* thread) {
4138 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4140 OSThread* osthread = thread->osthread();
4142 int isInterrupted = osthread->interrupted();
4143 if (!isInterrupted) {
4144 osthread->set_interrupted(true);
4145 OrderAccess::fence();
4146 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4147 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4148 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4149 ParkEvent * const slp = thread->_SleepEvent ;
4150 if (slp != NULL) slp->unpark() ;
4151 }
4153 // For JSR166: unpark after setting status but before thr_kill -dl
4154 if (thread->is_Java_thread()) {
4155 ((JavaThread*)thread)->parker()->unpark();
4156 }
4158 // Handle interruptible wait() ...
4159 ParkEvent * const ev = thread->_ParkEvent ;
4160 if (ev != NULL) ev->unpark() ;
4162 // When events are used everywhere for os::sleep, then this thr_kill
4163 // will only be needed if UseVMInterruptibleIO is true.
4165 if (!isInterrupted) {
4166 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4167 assert_status(status == 0, status, "thr_kill");
4169 // Bump thread interruption counter
4170 RuntimeService::record_thread_interrupt_signaled_count();
4171 }
4172 }
4175 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4176 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4178 OSThread* osthread = thread->osthread();
4180 bool res = osthread->interrupted();
4182 // NOTE that since there is no "lock" around these two operations,
4183 // there is the possibility that the interrupted flag will be
4184 // "false" but that the interrupt event will be set. This is
4185 // intentional. The effect of this is that Object.wait() will appear
4186 // to have a spurious wakeup, which is not harmful, and the
4187 // possibility is so rare that it is not worth the added complexity
4188 // to add yet another lock. It has also been recommended not to put
4189 // the interrupted flag into the os::Solaris::Event structure,
4190 // because it hides the issue.
4191 if (res && clear_interrupted) {
4192 osthread->set_interrupted(false);
4193 }
4194 return res;
4195 }
4198 void os::print_statistics() {
4199 }
4201 int os::message_box(const char* title, const char* message) {
4202 int i;
4203 fdStream err(defaultStream::error_fd());
4204 for (i = 0; i < 78; i++) err.print_raw("=");
4205 err.cr();
4206 err.print_raw_cr(title);
4207 for (i = 0; i < 78; i++) err.print_raw("-");
4208 err.cr();
4209 err.print_raw_cr(message);
4210 for (i = 0; i < 78; i++) err.print_raw("=");
4211 err.cr();
4213 char buf[16];
4214 // Prevent process from exiting upon "read error" without consuming all CPU
4215 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4217 return buf[0] == 'y' || buf[0] == 'Y';
4218 }
4220 static int sr_notify(OSThread* osthread) {
4221 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4222 assert_status(status == 0, status, "thr_kill");
4223 return status;
4224 }
4226 // "Randomly" selected value for how long we want to spin
4227 // before bailing out on suspending a thread, also how often
4228 // we send a signal to a thread we want to resume
4229 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4230 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4232 static bool do_suspend(OSThread* osthread) {
4233 assert(osthread->sr.is_running(), "thread should be running");
4234 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4236 // mark as suspended and send signal
4237 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4238 // failed to switch, state wasn't running?
4239 ShouldNotReachHere();
4240 return false;
4241 }
4243 if (sr_notify(osthread) != 0) {
4244 ShouldNotReachHere();
4245 }
4247 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4248 while (true) {
4249 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4250 break;
4251 } else {
4252 // timeout
4253 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4254 if (cancelled == os::SuspendResume::SR_RUNNING) {
4255 return false;
4256 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4257 // make sure that we consume the signal on the semaphore as well
4258 sr_semaphore.wait();
4259 break;
4260 } else {
4261 ShouldNotReachHere();
4262 return false;
4263 }
4264 }
4265 }
4267 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4268 return true;
4269 }
4271 static void do_resume(OSThread* osthread) {
4272 assert(osthread->sr.is_suspended(), "thread should be suspended");
4273 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4275 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4276 // failed to switch to WAKEUP_REQUEST
4277 ShouldNotReachHere();
4278 return;
4279 }
4281 while (true) {
4282 if (sr_notify(osthread) == 0) {
4283 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4284 if (osthread->sr.is_running()) {
4285 return;
4286 }
4287 }
4288 } else {
4289 ShouldNotReachHere();
4290 }
4291 }
4293 guarantee(osthread->sr.is_running(), "Must be running!");
4294 }
4296 void os::SuspendedThreadTask::internal_do_task() {
4297 if (do_suspend(_thread->osthread())) {
4298 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4299 do_task(context);
4300 do_resume(_thread->osthread());
4301 }
4302 }
4304 class PcFetcher : public os::SuspendedThreadTask {
4305 public:
4306 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4307 ExtendedPC result();
4308 protected:
4309 void do_task(const os::SuspendedThreadTaskContext& context);
4310 private:
4311 ExtendedPC _epc;
4312 };
4314 ExtendedPC PcFetcher::result() {
4315 guarantee(is_done(), "task is not done yet.");
4316 return _epc;
4317 }
4319 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4320 Thread* thread = context.thread();
4321 OSThread* osthread = thread->osthread();
4322 if (osthread->ucontext() != NULL) {
4323 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4324 } else {
4325 // NULL context is unexpected, double-check this is the VMThread
4326 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4327 }
4328 }
4330 // A lightweight implementation that does not suspend the target thread and
4331 // thus returns only a hint. Used for profiling only!
4332 ExtendedPC os::get_thread_pc(Thread* thread) {
4333 // Make sure that it is called by the watcher and the Threads lock is owned.
4334 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4335 // For now, is only used to profile the VM Thread
4336 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4337 PcFetcher fetcher(thread);
4338 fetcher.run();
4339 return fetcher.result();
4340 }
4343 // This does not do anything on Solaris. This is basically a hook for being
4344 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4345 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4346 f(value, method, args, thread);
4347 }
4349 // This routine may be used by user applications as a "hook" to catch signals.
4350 // The user-defined signal handler must pass unrecognized signals to this
4351 // routine, and if it returns true (non-zero), then the signal handler must
4352 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4353 // routine will never retun false (zero), but instead will execute a VM panic
4354 // routine kill the process.
4355 //
4356 // If this routine returns false, it is OK to call it again. This allows
4357 // the user-defined signal handler to perform checks either before or after
4358 // the VM performs its own checks. Naturally, the user code would be making
4359 // a serious error if it tried to handle an exception (such as a null check
4360 // or breakpoint) that the VM was generating for its own correct operation.
4361 //
4362 // This routine may recognize any of the following kinds of signals:
4363 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4364 // os::Solaris::SIGasync
4365 // It should be consulted by handlers for any of those signals.
4366 // It explicitly does not recognize os::Solaris::SIGinterrupt
4367 //
4368 // The caller of this routine must pass in the three arguments supplied
4369 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4370 // field of the structure passed to sigaction(). This routine assumes that
4371 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4372 //
4373 // Note that the VM will print warnings if it detects conflicting signal
4374 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4375 //
4376 extern "C" JNIEXPORT int
4377 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4378 int abort_if_unrecognized);
4381 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4382 int orig_errno = errno; // Preserve errno value over signal handler.
4383 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4384 errno = orig_errno;
4385 }
4387 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4388 is needed to provoke threads blocked on IO to return an EINTR
4389 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4390 does NOT participate in signal chaining due to requirement for
4391 NOT setting SA_RESTART to make EINTR work. */
4392 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4393 if (UseSignalChaining) {
4394 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4395 if (actp && actp->sa_handler) {
4396 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4397 }
4398 }
4399 }
4401 // This boolean allows users to forward their own non-matching signals
4402 // to JVM_handle_solaris_signal, harmlessly.
4403 bool os::Solaris::signal_handlers_are_installed = false;
4405 // For signal-chaining
4406 bool os::Solaris::libjsig_is_loaded = false;
4407 typedef struct sigaction *(*get_signal_t)(int);
4408 get_signal_t os::Solaris::get_signal_action = NULL;
4410 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4411 struct sigaction *actp = NULL;
4413 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4414 // Retrieve the old signal handler from libjsig
4415 actp = (*get_signal_action)(sig);
4416 }
4417 if (actp == NULL) {
4418 // Retrieve the preinstalled signal handler from jvm
4419 actp = get_preinstalled_handler(sig);
4420 }
4422 return actp;
4423 }
4425 static bool call_chained_handler(struct sigaction *actp, int sig,
4426 siginfo_t *siginfo, void *context) {
4427 // Call the old signal handler
4428 if (actp->sa_handler == SIG_DFL) {
4429 // It's more reasonable to let jvm treat it as an unexpected exception
4430 // instead of taking the default action.
4431 return false;
4432 } else if (actp->sa_handler != SIG_IGN) {
4433 if ((actp->sa_flags & SA_NODEFER) == 0) {
4434 // automaticlly block the signal
4435 sigaddset(&(actp->sa_mask), sig);
4436 }
4438 sa_handler_t hand;
4439 sa_sigaction_t sa;
4440 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4441 // retrieve the chained handler
4442 if (siginfo_flag_set) {
4443 sa = actp->sa_sigaction;
4444 } else {
4445 hand = actp->sa_handler;
4446 }
4448 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4449 actp->sa_handler = SIG_DFL;
4450 }
4452 // try to honor the signal mask
4453 sigset_t oset;
4454 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4456 // call into the chained handler
4457 if (siginfo_flag_set) {
4458 (*sa)(sig, siginfo, context);
4459 } else {
4460 (*hand)(sig);
4461 }
4463 // restore the signal mask
4464 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4465 }
4466 // Tell jvm's signal handler the signal is taken care of.
4467 return true;
4468 }
4470 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4471 bool chained = false;
4472 // signal-chaining
4473 if (UseSignalChaining) {
4474 struct sigaction *actp = get_chained_signal_action(sig);
4475 if (actp != NULL) {
4476 chained = call_chained_handler(actp, sig, siginfo, context);
4477 }
4478 }
4479 return chained;
4480 }
4482 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4483 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4484 if (preinstalled_sigs[sig] != 0) {
4485 return &chainedsigactions[sig];
4486 }
4487 return NULL;
4488 }
4490 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4492 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4493 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4494 chainedsigactions[sig] = oldAct;
4495 preinstalled_sigs[sig] = 1;
4496 }
4498 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4499 // Check for overwrite.
4500 struct sigaction oldAct;
4501 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4502 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4503 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4504 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4505 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4506 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4507 if (AllowUserSignalHandlers || !set_installed) {
4508 // Do not overwrite; user takes responsibility to forward to us.
4509 return;
4510 } else if (UseSignalChaining) {
4511 if (oktochain) {
4512 // save the old handler in jvm
4513 save_preinstalled_handler(sig, oldAct);
4514 } else {
4515 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4516 }
4517 // libjsig also interposes the sigaction() call below and saves the
4518 // old sigaction on it own.
4519 } else {
4520 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4521 "%#lx for signal %d.", (long)oldhand, sig));
4522 }
4523 }
4525 struct sigaction sigAct;
4526 sigfillset(&(sigAct.sa_mask));
4527 sigAct.sa_handler = SIG_DFL;
4529 sigAct.sa_sigaction = signalHandler;
4530 // Handle SIGSEGV on alternate signal stack if
4531 // not using stack banging
4532 if (!UseStackBanging && sig == SIGSEGV) {
4533 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4534 // Interruptible i/o requires SA_RESTART cleared so EINTR
4535 // is returned instead of restarting system calls
4536 } else if (sig == os::Solaris::SIGinterrupt()) {
4537 sigemptyset(&sigAct.sa_mask);
4538 sigAct.sa_handler = NULL;
4539 sigAct.sa_flags = SA_SIGINFO;
4540 sigAct.sa_sigaction = sigINTRHandler;
4541 } else {
4542 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4543 }
4544 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4546 sigaction(sig, &sigAct, &oldAct);
4548 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4549 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4550 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4551 }
4554 #define DO_SIGNAL_CHECK(sig) \
4555 if (!sigismember(&check_signal_done, sig)) \
4556 os::Solaris::check_signal_handler(sig)
4558 // This method is a periodic task to check for misbehaving JNI applications
4559 // under CheckJNI, we can add any periodic checks here
4561 void os::run_periodic_checks() {
4562 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4563 // thereby preventing a NULL checks.
4564 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4566 if (check_signals == false) return;
4568 // SEGV and BUS if overridden could potentially prevent
4569 // generation of hs*.log in the event of a crash, debugging
4570 // such a case can be very challenging, so we absolutely
4571 // check for the following for a good measure:
4572 DO_SIGNAL_CHECK(SIGSEGV);
4573 DO_SIGNAL_CHECK(SIGILL);
4574 DO_SIGNAL_CHECK(SIGFPE);
4575 DO_SIGNAL_CHECK(SIGBUS);
4576 DO_SIGNAL_CHECK(SIGPIPE);
4577 DO_SIGNAL_CHECK(SIGXFSZ);
4579 // ReduceSignalUsage allows the user to override these handlers
4580 // see comments at the very top and jvm_solaris.h
4581 if (!ReduceSignalUsage) {
4582 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4583 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4584 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4585 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4586 }
4588 // See comments above for using JVM1/JVM2 and UseAltSigs
4589 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4590 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4592 }
4594 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4596 static os_sigaction_t os_sigaction = NULL;
4598 void os::Solaris::check_signal_handler(int sig) {
4599 char buf[O_BUFLEN];
4600 address jvmHandler = NULL;
4602 struct sigaction act;
4603 if (os_sigaction == NULL) {
4604 // only trust the default sigaction, in case it has been interposed
4605 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4606 if (os_sigaction == NULL) return;
4607 }
4609 os_sigaction(sig, (struct sigaction*)NULL, &act);
4611 address thisHandler = (act.sa_flags & SA_SIGINFO)
4612 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4613 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4616 switch(sig) {
4617 case SIGSEGV:
4618 case SIGBUS:
4619 case SIGFPE:
4620 case SIGPIPE:
4621 case SIGXFSZ:
4622 case SIGILL:
4623 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4624 break;
4626 case SHUTDOWN1_SIGNAL:
4627 case SHUTDOWN2_SIGNAL:
4628 case SHUTDOWN3_SIGNAL:
4629 case BREAK_SIGNAL:
4630 jvmHandler = (address)user_handler();
4631 break;
4633 default:
4634 int intrsig = os::Solaris::SIGinterrupt();
4635 int asynsig = os::Solaris::SIGasync();
4637 if (sig == intrsig) {
4638 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4639 } else if (sig == asynsig) {
4640 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4641 } else {
4642 return;
4643 }
4644 break;
4645 }
4648 if (thisHandler != jvmHandler) {
4649 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4650 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4651 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4652 // No need to check this sig any longer
4653 sigaddset(&check_signal_done, sig);
4654 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4655 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4656 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4657 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4658 // No need to check this sig any longer
4659 sigaddset(&check_signal_done, sig);
4660 }
4662 // Print all the signal handler state
4663 if (sigismember(&check_signal_done, sig)) {
4664 print_signal_handlers(tty, buf, O_BUFLEN);
4665 }
4667 }
4669 void os::Solaris::install_signal_handlers() {
4670 bool libjsigdone = false;
4671 signal_handlers_are_installed = true;
4673 // signal-chaining
4674 typedef void (*signal_setting_t)();
4675 signal_setting_t begin_signal_setting = NULL;
4676 signal_setting_t end_signal_setting = NULL;
4677 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4678 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4679 if (begin_signal_setting != NULL) {
4680 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4681 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4682 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4683 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4684 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4685 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4686 libjsig_is_loaded = true;
4687 if (os::Solaris::get_libjsig_version != NULL) {
4688 libjsigversion = (*os::Solaris::get_libjsig_version)();
4689 }
4690 assert(UseSignalChaining, "should enable signal-chaining");
4691 }
4692 if (libjsig_is_loaded) {
4693 // Tell libjsig jvm is setting signal handlers
4694 (*begin_signal_setting)();
4695 }
4697 set_signal_handler(SIGSEGV, true, true);
4698 set_signal_handler(SIGPIPE, true, true);
4699 set_signal_handler(SIGXFSZ, true, true);
4700 set_signal_handler(SIGBUS, true, true);
4701 set_signal_handler(SIGILL, true, true);
4702 set_signal_handler(SIGFPE, true, true);
4705 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4707 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4708 // can not register overridable signals which might be > 32
4709 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4710 // Tell libjsig jvm has finished setting signal handlers
4711 (*end_signal_setting)();
4712 libjsigdone = true;
4713 }
4714 }
4716 // Never ok to chain our SIGinterrupt
4717 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4718 set_signal_handler(os::Solaris::SIGasync(), true, true);
4720 if (libjsig_is_loaded && !libjsigdone) {
4721 // Tell libjsig jvm finishes setting signal handlers
4722 (*end_signal_setting)();
4723 }
4725 // We don't activate signal checker if libjsig is in place, we trust ourselves
4726 // and if UserSignalHandler is installed all bets are off.
4727 // Log that signal checking is off only if -verbose:jni is specified.
4728 if (CheckJNICalls) {
4729 if (libjsig_is_loaded) {
4730 if (PrintJNIResolving) {
4731 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4732 }
4733 check_signals = false;
4734 }
4735 if (AllowUserSignalHandlers) {
4736 if (PrintJNIResolving) {
4737 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4738 }
4739 check_signals = false;
4740 }
4741 }
4742 }
4745 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4747 const char * signames[] = {
4748 "SIG0",
4749 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4750 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4751 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4752 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4753 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4754 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4755 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4756 "SIGCANCEL", "SIGLOST"
4757 };
4759 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4760 if (0 < exception_code && exception_code <= SIGRTMAX) {
4761 // signal
4762 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4763 jio_snprintf(buf, size, "%s", signames[exception_code]);
4764 } else {
4765 jio_snprintf(buf, size, "SIG%d", exception_code);
4766 }
4767 return buf;
4768 } else {
4769 return NULL;
4770 }
4771 }
4773 // (Static) wrappers for the new libthread API
4774 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4775 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4776 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4777 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4778 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4780 // (Static) wrapper for getisax(2) call.
4781 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4783 // (Static) wrappers for the liblgrp API
4784 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4785 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4786 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4787 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4788 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4789 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4790 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4791 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4792 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4794 // (Static) wrapper for meminfo() call.
4795 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4797 static address resolve_symbol_lazy(const char* name) {
4798 address addr = (address) dlsym(RTLD_DEFAULT, name);
4799 if(addr == NULL) {
4800 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4801 addr = (address) dlsym(RTLD_NEXT, name);
4802 }
4803 return addr;
4804 }
4806 static address resolve_symbol(const char* name) {
4807 address addr = resolve_symbol_lazy(name);
4808 if(addr == NULL) {
4809 fatal(dlerror());
4810 }
4811 return addr;
4812 }
4816 // isT2_libthread()
4817 //
4818 // Routine to determine if we are currently using the new T2 libthread.
4819 //
4820 // We determine if we are using T2 by reading /proc/self/lstatus and
4821 // looking for a thread with the ASLWP bit set. If we find this status
4822 // bit set, we must assume that we are NOT using T2. The T2 team
4823 // has approved this algorithm.
4824 //
4825 // We need to determine if we are running with the new T2 libthread
4826 // since setting native thread priorities is handled differently
4827 // when using this library. All threads created using T2 are bound
4828 // threads. Calling thr_setprio is meaningless in this case.
4829 //
4830 bool isT2_libthread() {
4831 static prheader_t * lwpArray = NULL;
4832 static int lwpSize = 0;
4833 static int lwpFile = -1;
4834 lwpstatus_t * that;
4835 char lwpName [128];
4836 bool isT2 = false;
4838 #define ADR(x) ((uintptr_t)(x))
4839 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4841 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4842 if (lwpFile < 0) {
4843 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4844 return false;
4845 }
4846 lwpSize = 16*1024;
4847 for (;;) {
4848 ::lseek64 (lwpFile, 0, SEEK_SET);
4849 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4850 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4851 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4852 break;
4853 }
4854 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4855 // We got a good snapshot - now iterate over the list.
4856 int aslwpcount = 0;
4857 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4858 that = LWPINDEX(lwpArray,i);
4859 if (that->pr_flags & PR_ASLWP) {
4860 aslwpcount++;
4861 }
4862 }
4863 if (aslwpcount == 0) isT2 = true;
4864 break;
4865 }
4866 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4867 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4868 }
4870 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4871 ::close (lwpFile);
4872 if (ThreadPriorityVerbose) {
4873 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4874 else tty->print_cr("We are not running with a T2 libthread\n");
4875 }
4876 return isT2;
4877 }
4880 void os::Solaris::libthread_init() {
4881 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4883 // Determine if we are running with the new T2 libthread
4884 os::Solaris::set_T2_libthread(isT2_libthread());
4886 lwp_priocntl_init();
4888 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4889 if(func == NULL) {
4890 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4891 // Guarantee that this VM is running on an new enough OS (5.6 or
4892 // later) that it will have a new enough libthread.so.
4893 guarantee(func != NULL, "libthread.so is too old.");
4894 }
4896 // Initialize the new libthread getstate API wrappers
4897 func = resolve_symbol("thr_getstate");
4898 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4900 func = resolve_symbol("thr_setstate");
4901 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4903 func = resolve_symbol("thr_setmutator");
4904 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4906 func = resolve_symbol("thr_suspend_mutator");
4907 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4909 func = resolve_symbol("thr_continue_mutator");
4910 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4912 int size;
4913 void (*handler_info_func)(address *, int *);
4914 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4915 handler_info_func(&handler_start, &size);
4916 handler_end = handler_start + size;
4917 }
4920 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4921 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4922 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4923 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4924 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4925 int os::Solaris::_mutex_scope = USYNC_THREAD;
4927 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4928 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4929 int_fnP_cond_tP os::Solaris::_cond_signal;
4930 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4931 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4932 int_fnP_cond_tP os::Solaris::_cond_destroy;
4933 int os::Solaris::_cond_scope = USYNC_THREAD;
4935 void os::Solaris::synchronization_init() {
4936 if(UseLWPSynchronization) {
4937 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4938 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4939 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4940 os::Solaris::set_mutex_init(lwp_mutex_init);
4941 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4942 os::Solaris::set_mutex_scope(USYNC_THREAD);
4944 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4945 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4946 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4947 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4948 os::Solaris::set_cond_init(lwp_cond_init);
4949 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4950 os::Solaris::set_cond_scope(USYNC_THREAD);
4951 }
4952 else {
4953 os::Solaris::set_mutex_scope(USYNC_THREAD);
4954 os::Solaris::set_cond_scope(USYNC_THREAD);
4956 if(UsePthreads) {
4957 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4958 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4959 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4960 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4961 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4963 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4964 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4965 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4966 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4967 os::Solaris::set_cond_init(pthread_cond_default_init);
4968 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4969 }
4970 else {
4971 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4972 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4973 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4974 os::Solaris::set_mutex_init(::mutex_init);
4975 os::Solaris::set_mutex_destroy(::mutex_destroy);
4977 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4978 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4979 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4980 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4981 os::Solaris::set_cond_init(::cond_init);
4982 os::Solaris::set_cond_destroy(::cond_destroy);
4983 }
4984 }
4985 }
4987 bool os::Solaris::liblgrp_init() {
4988 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4989 if (handle != NULL) {
4990 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4991 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4992 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4993 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4994 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4995 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4996 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4997 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4998 dlsym(handle, "lgrp_cookie_stale")));
5000 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
5001 set_lgrp_cookie(c);
5002 return true;
5003 }
5004 return false;
5005 }
5007 void os::Solaris::misc_sym_init() {
5008 address func;
5010 // getisax
5011 func = resolve_symbol_lazy("getisax");
5012 if (func != NULL) {
5013 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
5014 }
5016 // meminfo
5017 func = resolve_symbol_lazy("meminfo");
5018 if (func != NULL) {
5019 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
5020 }
5021 }
5023 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
5024 assert(_getisax != NULL, "_getisax not set");
5025 return _getisax(array, n);
5026 }
5028 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
5029 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
5030 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
5032 void init_pset_getloadavg_ptr(void) {
5033 pset_getloadavg_ptr =
5034 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
5035 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
5036 warning("pset_getloadavg function not found");
5037 }
5038 }
5040 int os::Solaris::_dev_zero_fd = -1;
5042 // this is called _before_ the global arguments have been parsed
5043 void os::init(void) {
5044 _initial_pid = getpid();
5046 max_hrtime = first_hrtime = gethrtime();
5048 init_random(1234567);
5050 page_size = sysconf(_SC_PAGESIZE);
5051 if (page_size == -1)
5052 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
5053 strerror(errno)));
5054 init_page_sizes((size_t) page_size);
5056 Solaris::initialize_system_info();
5058 // Initialize misc. symbols as soon as possible, so we can use them
5059 // if we need them.
5060 Solaris::misc_sym_init();
5062 int fd = ::open("/dev/zero", O_RDWR);
5063 if (fd < 0) {
5064 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
5065 } else {
5066 Solaris::set_dev_zero_fd(fd);
5068 // Close on exec, child won't inherit.
5069 fcntl(fd, F_SETFD, FD_CLOEXEC);
5070 }
5072 clock_tics_per_sec = CLK_TCK;
5074 // check if dladdr1() exists; dladdr1 can provide more information than
5075 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
5076 // and is available on linker patches for 5.7 and 5.8.
5077 // libdl.so must have been loaded, this call is just an entry lookup
5078 void * hdl = dlopen("libdl.so", RTLD_NOW);
5079 if (hdl)
5080 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
5082 // (Solaris only) this switches to calls that actually do locking.
5083 ThreadCritical::initialize();
5085 main_thread = thr_self();
5087 // Constant minimum stack size allowed. It must be at least
5088 // the minimum of what the OS supports (thr_min_stack()), and
5089 // enough to allow the thread to get to user bytecode execution.
5090 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
5091 // If the pagesize of the VM is greater than 8K determine the appropriate
5092 // number of initial guard pages. The user can change this with the
5093 // command line arguments, if needed.
5094 if (vm_page_size() > 8*K) {
5095 StackYellowPages = 1;
5096 StackRedPages = 1;
5097 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
5098 }
5099 }
5101 // To install functions for atexit system call
5102 extern "C" {
5103 static void perfMemory_exit_helper() {
5104 perfMemory_exit();
5105 }
5106 }
5108 // this is called _after_ the global arguments have been parsed
5109 jint os::init_2(void) {
5110 // try to enable extended file IO ASAP, see 6431278
5111 os::Solaris::try_enable_extended_io();
5113 // Allocate a single page and mark it as readable for safepoint polling. Also
5114 // use this first mmap call to check support for MAP_ALIGN.
5115 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
5116 page_size,
5117 MAP_PRIVATE | MAP_ALIGN,
5118 PROT_READ);
5119 if (polling_page == NULL) {
5120 has_map_align = false;
5121 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
5122 PROT_READ);
5123 }
5125 os::set_polling_page(polling_page);
5127 #ifndef PRODUCT
5128 if( Verbose && PrintMiscellaneous )
5129 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
5130 #endif
5132 if (!UseMembar) {
5133 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
5134 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
5135 os::set_memory_serialize_page( mem_serialize_page );
5137 #ifndef PRODUCT
5138 if(Verbose && PrintMiscellaneous)
5139 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
5140 #endif
5141 }
5143 // Check minimum allowable stack size for thread creation and to initialize
5144 // the java system classes, including StackOverflowError - depends on page
5145 // size. Add a page for compiler2 recursion in main thread.
5146 // Add in 2*BytesPerWord times page size to account for VM stack during
5147 // class initialization depending on 32 or 64 bit VM.
5148 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5149 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5150 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5152 size_t threadStackSizeInBytes = ThreadStackSize * K;
5153 if (threadStackSizeInBytes != 0 &&
5154 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5155 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5156 os::Solaris::min_stack_allowed/K);
5157 return JNI_ERR;
5158 }
5160 // For 64kbps there will be a 64kb page size, which makes
5161 // the usable default stack size quite a bit less. Increase the
5162 // stack for 64kb (or any > than 8kb) pages, this increases
5163 // virtual memory fragmentation (since we're not creating the
5164 // stack on a power of 2 boundary. The real fix for this
5165 // should be to fix the guard page mechanism.
5167 if (vm_page_size() > 8*K) {
5168 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5169 ? threadStackSizeInBytes +
5170 ((StackYellowPages + StackRedPages) * vm_page_size())
5171 : 0;
5172 ThreadStackSize = threadStackSizeInBytes/K;
5173 }
5175 // Make the stack size a multiple of the page size so that
5176 // the yellow/red zones can be guarded.
5177 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5178 vm_page_size()));
5180 Solaris::libthread_init();
5182 if (UseNUMA) {
5183 if (!Solaris::liblgrp_init()) {
5184 UseNUMA = false;
5185 } else {
5186 size_t lgrp_limit = os::numa_get_groups_num();
5187 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5188 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5189 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5190 if (lgrp_num < 2) {
5191 // There's only one locality group, disable NUMA.
5192 UseNUMA = false;
5193 }
5194 }
5195 if (!UseNUMA && ForceNUMA) {
5196 UseNUMA = true;
5197 }
5198 }
5200 Solaris::signal_sets_init();
5201 Solaris::init_signal_mem();
5202 Solaris::install_signal_handlers();
5204 if (libjsigversion < JSIG_VERSION_1_4_1) {
5205 Maxlibjsigsigs = OLDMAXSIGNUM;
5206 }
5208 // initialize synchronization primitives to use either thread or
5209 // lwp synchronization (controlled by UseLWPSynchronization)
5210 Solaris::synchronization_init();
5212 if (MaxFDLimit) {
5213 // set the number of file descriptors to max. print out error
5214 // if getrlimit/setrlimit fails but continue regardless.
5215 struct rlimit nbr_files;
5216 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5217 if (status != 0) {
5218 if (PrintMiscellaneous && (Verbose || WizardMode))
5219 perror("os::init_2 getrlimit failed");
5220 } else {
5221 nbr_files.rlim_cur = nbr_files.rlim_max;
5222 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5223 if (status != 0) {
5224 if (PrintMiscellaneous && (Verbose || WizardMode))
5225 perror("os::init_2 setrlimit failed");
5226 }
5227 }
5228 }
5230 // Calculate theoretical max. size of Threads to guard gainst
5231 // artifical out-of-memory situations, where all available address-
5232 // space has been reserved by thread stacks. Default stack size is 1Mb.
5233 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5234 JavaThread::stack_size_at_create() : (1*K*K);
5235 assert(pre_thread_stack_size != 0, "Must have a stack");
5236 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5237 // we should start doing Virtual Memory banging. Currently when the threads will
5238 // have used all but 200Mb of space.
5239 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5240 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5242 // at-exit methods are called in the reverse order of their registration.
5243 // In Solaris 7 and earlier, atexit functions are called on return from
5244 // main or as a result of a call to exit(3C). There can be only 32 of
5245 // these functions registered and atexit() does not set errno. In Solaris
5246 // 8 and later, there is no limit to the number of functions registered
5247 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5248 // functions are called upon dlclose(3DL) in addition to return from main
5249 // and exit(3C).
5251 if (PerfAllowAtExitRegistration) {
5252 // only register atexit functions if PerfAllowAtExitRegistration is set.
5253 // atexit functions can be delayed until process exit time, which
5254 // can be problematic for embedded VM situations. Embedded VMs should
5255 // call DestroyJavaVM() to assure that VM resources are released.
5257 // note: perfMemory_exit_helper atexit function may be removed in
5258 // the future if the appropriate cleanup code can be added to the
5259 // VM_Exit VMOperation's doit method.
5260 if (atexit(perfMemory_exit_helper) != 0) {
5261 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5262 }
5263 }
5265 // Init pset_loadavg function pointer
5266 init_pset_getloadavg_ptr();
5268 return JNI_OK;
5269 }
5271 void os::init_3(void) {
5272 return;
5273 }
5275 // Mark the polling page as unreadable
5276 void os::make_polling_page_unreadable(void) {
5277 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5278 fatal("Could not disable polling page");
5279 };
5281 // Mark the polling page as readable
5282 void os::make_polling_page_readable(void) {
5283 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5284 fatal("Could not enable polling page");
5285 };
5287 // OS interface.
5289 bool os::check_heap(bool force) { return true; }
5291 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5292 static vsnprintf_t sol_vsnprintf = NULL;
5294 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5295 if (!sol_vsnprintf) {
5296 //search for the named symbol in the objects that were loaded after libjvm
5297 void* where = RTLD_NEXT;
5298 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5299 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5300 if (!sol_vsnprintf){
5301 //search for the named symbol in the objects that were loaded before libjvm
5302 where = RTLD_DEFAULT;
5303 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5304 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5305 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5306 }
5307 }
5308 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5309 }
5312 // Is a (classpath) directory empty?
5313 bool os::dir_is_empty(const char* path) {
5314 DIR *dir = NULL;
5315 struct dirent *ptr;
5317 dir = opendir(path);
5318 if (dir == NULL) return true;
5320 /* Scan the directory */
5321 bool result = true;
5322 char buf[sizeof(struct dirent) + MAX_PATH];
5323 struct dirent *dbuf = (struct dirent *) buf;
5324 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5325 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5326 result = false;
5327 }
5328 }
5329 closedir(dir);
5330 return result;
5331 }
5333 // This code originates from JDK's sysOpen and open64_w
5334 // from src/solaris/hpi/src/system_md.c
5336 #ifndef O_DELETE
5337 #define O_DELETE 0x10000
5338 #endif
5340 // Open a file. Unlink the file immediately after open returns
5341 // if the specified oflag has the O_DELETE flag set.
5342 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5344 int os::open(const char *path, int oflag, int mode) {
5345 if (strlen(path) > MAX_PATH - 1) {
5346 errno = ENAMETOOLONG;
5347 return -1;
5348 }
5349 int fd;
5350 int o_delete = (oflag & O_DELETE);
5351 oflag = oflag & ~O_DELETE;
5353 fd = ::open64(path, oflag, mode);
5354 if (fd == -1) return -1;
5356 //If the open succeeded, the file might still be a directory
5357 {
5358 struct stat64 buf64;
5359 int ret = ::fstat64(fd, &buf64);
5360 int st_mode = buf64.st_mode;
5362 if (ret != -1) {
5363 if ((st_mode & S_IFMT) == S_IFDIR) {
5364 errno = EISDIR;
5365 ::close(fd);
5366 return -1;
5367 }
5368 } else {
5369 ::close(fd);
5370 return -1;
5371 }
5372 }
5373 /*
5374 * 32-bit Solaris systems suffer from:
5375 *
5376 * - an historical default soft limit of 256 per-process file
5377 * descriptors that is too low for many Java programs.
5378 *
5379 * - a design flaw where file descriptors created using stdio
5380 * fopen must be less than 256, _even_ when the first limit above
5381 * has been raised. This can cause calls to fopen (but not calls to
5382 * open, for example) to fail mysteriously, perhaps in 3rd party
5383 * native code (although the JDK itself uses fopen). One can hardly
5384 * criticize them for using this most standard of all functions.
5385 *
5386 * We attempt to make everything work anyways by:
5387 *
5388 * - raising the soft limit on per-process file descriptors beyond
5389 * 256
5390 *
5391 * - As of Solaris 10u4, we can request that Solaris raise the 256
5392 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5393 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5394 *
5395 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5396 * workaround the bug by remapping non-stdio file descriptors below
5397 * 256 to ones beyond 256, which is done below.
5398 *
5399 * See:
5400 * 1085341: 32-bit stdio routines should support file descriptors >255
5401 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5402 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5403 * enable_extended_FILE_stdio() in VM initialisation
5404 * Giri Mandalika's blog
5405 * http://technopark02.blogspot.com/2005_05_01_archive.html
5406 */
5407 #ifndef _LP64
5408 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5409 int newfd = ::fcntl(fd, F_DUPFD, 256);
5410 if (newfd != -1) {
5411 ::close(fd);
5412 fd = newfd;
5413 }
5414 }
5415 #endif // 32-bit Solaris
5416 /*
5417 * All file descriptors that are opened in the JVM and not
5418 * specifically destined for a subprocess should have the
5419 * close-on-exec flag set. If we don't set it, then careless 3rd
5420 * party native code might fork and exec without closing all
5421 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5422 * UNIXProcess.c), and this in turn might:
5423 *
5424 * - cause end-of-file to fail to be detected on some file
5425 * descriptors, resulting in mysterious hangs, or
5426 *
5427 * - might cause an fopen in the subprocess to fail on a system
5428 * suffering from bug 1085341.
5429 *
5430 * (Yes, the default setting of the close-on-exec flag is a Unix
5431 * design flaw)
5432 *
5433 * See:
5434 * 1085341: 32-bit stdio routines should support file descriptors >255
5435 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5436 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5437 */
5438 #ifdef FD_CLOEXEC
5439 {
5440 int flags = ::fcntl(fd, F_GETFD);
5441 if (flags != -1)
5442 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5443 }
5444 #endif
5446 if (o_delete != 0) {
5447 ::unlink(path);
5448 }
5449 return fd;
5450 }
5452 // create binary file, rewriting existing file if required
5453 int os::create_binary_file(const char* path, bool rewrite_existing) {
5454 int oflags = O_WRONLY | O_CREAT;
5455 if (!rewrite_existing) {
5456 oflags |= O_EXCL;
5457 }
5458 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5459 }
5461 // return current position of file pointer
5462 jlong os::current_file_offset(int fd) {
5463 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5464 }
5466 // move file pointer to the specified offset
5467 jlong os::seek_to_file_offset(int fd, jlong offset) {
5468 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5469 }
5471 jlong os::lseek(int fd, jlong offset, int whence) {
5472 return (jlong) ::lseek64(fd, offset, whence);
5473 }
5475 char * os::native_path(char *path) {
5476 return path;
5477 }
5479 int os::ftruncate(int fd, jlong length) {
5480 return ::ftruncate64(fd, length);
5481 }
5483 int os::fsync(int fd) {
5484 RESTARTABLE_RETURN_INT(::fsync(fd));
5485 }
5487 int os::available(int fd, jlong *bytes) {
5488 jlong cur, end;
5489 int mode;
5490 struct stat64 buf64;
5492 if (::fstat64(fd, &buf64) >= 0) {
5493 mode = buf64.st_mode;
5494 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5495 /*
5496 * XXX: is the following call interruptible? If so, this might
5497 * need to go through the INTERRUPT_IO() wrapper as for other
5498 * blocking, interruptible calls in this file.
5499 */
5500 int n,ioctl_return;
5502 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5503 if (ioctl_return>= 0) {
5504 *bytes = n;
5505 return 1;
5506 }
5507 }
5508 }
5509 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5510 return 0;
5511 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5512 return 0;
5513 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5514 return 0;
5515 }
5516 *bytes = end - cur;
5517 return 1;
5518 }
5520 // Map a block of memory.
5521 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5522 char *addr, size_t bytes, bool read_only,
5523 bool allow_exec) {
5524 int prot;
5525 int flags;
5527 if (read_only) {
5528 prot = PROT_READ;
5529 flags = MAP_SHARED;
5530 } else {
5531 prot = PROT_READ | PROT_WRITE;
5532 flags = MAP_PRIVATE;
5533 }
5535 if (allow_exec) {
5536 prot |= PROT_EXEC;
5537 }
5539 if (addr != NULL) {
5540 flags |= MAP_FIXED;
5541 }
5543 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5544 fd, file_offset);
5545 if (mapped_address == MAP_FAILED) {
5546 return NULL;
5547 }
5548 return mapped_address;
5549 }
5552 // Remap a block of memory.
5553 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5554 char *addr, size_t bytes, bool read_only,
5555 bool allow_exec) {
5556 // same as map_memory() on this OS
5557 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5558 allow_exec);
5559 }
5562 // Unmap a block of memory.
5563 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5564 return munmap(addr, bytes) == 0;
5565 }
5567 void os::pause() {
5568 char filename[MAX_PATH];
5569 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5570 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5571 } else {
5572 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5573 }
5575 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5576 if (fd != -1) {
5577 struct stat buf;
5578 ::close(fd);
5579 while (::stat(filename, &buf) == 0) {
5580 (void)::poll(NULL, 0, 100);
5581 }
5582 } else {
5583 jio_fprintf(stderr,
5584 "Could not open pause file '%s', continuing immediately.\n", filename);
5585 }
5586 }
5588 #ifndef PRODUCT
5589 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5590 // Turn this on if you need to trace synch operations.
5591 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5592 // and call record_synch_enable and record_synch_disable
5593 // around the computation of interest.
5595 void record_synch(char* name, bool returning); // defined below
5597 class RecordSynch {
5598 char* _name;
5599 public:
5600 RecordSynch(char* name) :_name(name)
5601 { record_synch(_name, false); }
5602 ~RecordSynch() { record_synch(_name, true); }
5603 };
5605 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5606 extern "C" ret name params { \
5607 typedef ret name##_t params; \
5608 static name##_t* implem = NULL; \
5609 static int callcount = 0; \
5610 if (implem == NULL) { \
5611 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5612 if (implem == NULL) fatal(dlerror()); \
5613 } \
5614 ++callcount; \
5615 RecordSynch _rs(#name); \
5616 inner; \
5617 return implem args; \
5618 }
5619 // in dbx, examine callcounts this way:
5620 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5622 #define CHECK_POINTER_OK(p) \
5623 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5624 #define CHECK_MU \
5625 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5626 #define CHECK_CV \
5627 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5628 #define CHECK_P(p) \
5629 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5631 #define CHECK_MUTEX(mutex_op) \
5632 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5634 CHECK_MUTEX( mutex_lock)
5635 CHECK_MUTEX( _mutex_lock)
5636 CHECK_MUTEX( mutex_unlock)
5637 CHECK_MUTEX(_mutex_unlock)
5638 CHECK_MUTEX( mutex_trylock)
5639 CHECK_MUTEX(_mutex_trylock)
5641 #define CHECK_COND(cond_op) \
5642 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5644 CHECK_COND( cond_wait);
5645 CHECK_COND(_cond_wait);
5646 CHECK_COND(_cond_wait_cancel);
5648 #define CHECK_COND2(cond_op) \
5649 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5651 CHECK_COND2( cond_timedwait);
5652 CHECK_COND2(_cond_timedwait);
5653 CHECK_COND2(_cond_timedwait_cancel);
5655 // do the _lwp_* versions too
5656 #define mutex_t lwp_mutex_t
5657 #define cond_t lwp_cond_t
5658 CHECK_MUTEX( _lwp_mutex_lock)
5659 CHECK_MUTEX( _lwp_mutex_unlock)
5660 CHECK_MUTEX( _lwp_mutex_trylock)
5661 CHECK_MUTEX( __lwp_mutex_lock)
5662 CHECK_MUTEX( __lwp_mutex_unlock)
5663 CHECK_MUTEX( __lwp_mutex_trylock)
5664 CHECK_MUTEX(___lwp_mutex_lock)
5665 CHECK_MUTEX(___lwp_mutex_unlock)
5667 CHECK_COND( _lwp_cond_wait);
5668 CHECK_COND( __lwp_cond_wait);
5669 CHECK_COND(___lwp_cond_wait);
5671 CHECK_COND2( _lwp_cond_timedwait);
5672 CHECK_COND2( __lwp_cond_timedwait);
5673 #undef mutex_t
5674 #undef cond_t
5676 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5677 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5678 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5679 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5680 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5681 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5682 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5683 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5686 // recording machinery:
5688 enum { RECORD_SYNCH_LIMIT = 200 };
5689 char* record_synch_name[RECORD_SYNCH_LIMIT];
5690 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5691 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5692 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5693 int record_synch_count = 0;
5694 bool record_synch_enabled = false;
5696 // in dbx, examine recorded data this way:
5697 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5699 void record_synch(char* name, bool returning) {
5700 if (record_synch_enabled) {
5701 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5702 record_synch_name[record_synch_count] = name;
5703 record_synch_returning[record_synch_count] = returning;
5704 record_synch_thread[record_synch_count] = thr_self();
5705 record_synch_arg0ptr[record_synch_count] = &name;
5706 record_synch_count++;
5707 }
5708 // put more checking code here:
5709 // ...
5710 }
5711 }
5713 void record_synch_enable() {
5714 // start collecting trace data, if not already doing so
5715 if (!record_synch_enabled) record_synch_count = 0;
5716 record_synch_enabled = true;
5717 }
5719 void record_synch_disable() {
5720 // stop collecting trace data
5721 record_synch_enabled = false;
5722 }
5724 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5725 #endif // PRODUCT
5727 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5728 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5729 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5732 // JVMTI & JVM monitoring and management support
5733 // The thread_cpu_time() and current_thread_cpu_time() are only
5734 // supported if is_thread_cpu_time_supported() returns true.
5735 // They are not supported on Solaris T1.
5737 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5738 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5739 // of a thread.
5740 //
5741 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5742 // returns the fast estimate available on the platform.
5744 // hrtime_t gethrvtime() return value includes
5745 // user time but does not include system time
5746 jlong os::current_thread_cpu_time() {
5747 return (jlong) gethrvtime();
5748 }
5750 jlong os::thread_cpu_time(Thread *thread) {
5751 // return user level CPU time only to be consistent with
5752 // what current_thread_cpu_time returns.
5753 // thread_cpu_time_info() must be changed if this changes
5754 return os::thread_cpu_time(thread, false /* user time only */);
5755 }
5757 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5758 if (user_sys_cpu_time) {
5759 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5760 } else {
5761 return os::current_thread_cpu_time();
5762 }
5763 }
5765 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5766 char proc_name[64];
5767 int count;
5768 prusage_t prusage;
5769 jlong lwp_time;
5770 int fd;
5772 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5773 getpid(),
5774 thread->osthread()->lwp_id());
5775 fd = ::open(proc_name, O_RDONLY);
5776 if ( fd == -1 ) return -1;
5778 do {
5779 count = ::pread(fd,
5780 (void *)&prusage.pr_utime,
5781 thr_time_size,
5782 thr_time_off);
5783 } while (count < 0 && errno == EINTR);
5784 ::close(fd);
5785 if ( count < 0 ) return -1;
5787 if (user_sys_cpu_time) {
5788 // user + system CPU time
5789 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5790 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5791 (jlong)prusage.pr_stime.tv_nsec +
5792 (jlong)prusage.pr_utime.tv_nsec;
5793 } else {
5794 // user level CPU time only
5795 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5796 (jlong)prusage.pr_utime.tv_nsec;
5797 }
5799 return(lwp_time);
5800 }
5802 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5803 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5804 info_ptr->may_skip_backward = false; // elapsed time not wall time
5805 info_ptr->may_skip_forward = false; // elapsed time not wall time
5806 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5807 }
5809 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5810 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5811 info_ptr->may_skip_backward = false; // elapsed time not wall time
5812 info_ptr->may_skip_forward = false; // elapsed time not wall time
5813 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5814 }
5816 bool os::is_thread_cpu_time_supported() {
5817 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5818 return true;
5819 } else {
5820 return false;
5821 }
5822 }
5824 // System loadavg support. Returns -1 if load average cannot be obtained.
5825 // Return the load average for our processor set if the primitive exists
5826 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5827 int os::loadavg(double loadavg[], int nelem) {
5828 if (pset_getloadavg_ptr != NULL) {
5829 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5830 } else {
5831 return ::getloadavg(loadavg, nelem);
5832 }
5833 }
5835 //---------------------------------------------------------------------------------
5837 bool os::find(address addr, outputStream* st) {
5838 Dl_info dlinfo;
5839 memset(&dlinfo, 0, sizeof(dlinfo));
5840 if (dladdr(addr, &dlinfo) != 0) {
5841 st->print(PTR_FORMAT ": ", addr);
5842 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5843 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5844 } else if (dlinfo.dli_fbase != NULL)
5845 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5846 else
5847 st->print("<absolute address>");
5848 if (dlinfo.dli_fname != NULL) {
5849 st->print(" in %s", dlinfo.dli_fname);
5850 }
5851 if (dlinfo.dli_fbase != NULL) {
5852 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5853 }
5854 st->cr();
5856 if (Verbose) {
5857 // decode some bytes around the PC
5858 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5859 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5860 address lowest = (address) dlinfo.dli_sname;
5861 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5862 if (begin < lowest) begin = lowest;
5863 Dl_info dlinfo2;
5864 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5865 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5866 end = (address) dlinfo2.dli_saddr;
5867 Disassembler::decode(begin, end, st);
5868 }
5869 return true;
5870 }
5871 return false;
5872 }
5874 // Following function has been added to support HotSparc's libjvm.so running
5875 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5876 // src/solaris/hpi/native_threads in the EVM codebase.
5877 //
5878 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5879 // libraries and should thus be removed. We will leave it behind for a while
5880 // until we no longer want to able to run on top of 1.3.0 Solaris production
5881 // JDK. See 4341971.
5883 #define STACK_SLACK 0x800
5885 extern "C" {
5886 intptr_t sysThreadAvailableStackWithSlack() {
5887 stack_t st;
5888 intptr_t retval, stack_top;
5889 retval = thr_stksegment(&st);
5890 assert(retval == 0, "incorrect return value from thr_stksegment");
5891 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5892 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5893 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5894 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5895 }
5896 }
5898 // ObjectMonitor park-unpark infrastructure ...
5899 //
5900 // We implement Solaris and Linux PlatformEvents with the
5901 // obvious condvar-mutex-flag triple.
5902 // Another alternative that works quite well is pipes:
5903 // Each PlatformEvent consists of a pipe-pair.
5904 // The thread associated with the PlatformEvent
5905 // calls park(), which reads from the input end of the pipe.
5906 // Unpark() writes into the other end of the pipe.
5907 // The write-side of the pipe must be set NDELAY.
5908 // Unfortunately pipes consume a large # of handles.
5909 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5910 // Using pipes for the 1st few threads might be workable, however.
5911 //
5912 // park() is permitted to return spuriously.
5913 // Callers of park() should wrap the call to park() in
5914 // an appropriate loop. A litmus test for the correct
5915 // usage of park is the following: if park() were modified
5916 // to immediately return 0 your code should still work,
5917 // albeit degenerating to a spin loop.
5918 //
5919 // An interesting optimization for park() is to use a trylock()
5920 // to attempt to acquire the mutex. If the trylock() fails
5921 // then we know that a concurrent unpark() operation is in-progress.
5922 // in that case the park() code could simply set _count to 0
5923 // and return immediately. The subsequent park() operation *might*
5924 // return immediately. That's harmless as the caller of park() is
5925 // expected to loop. By using trylock() we will have avoided a
5926 // avoided a context switch caused by contention on the per-thread mutex.
5927 //
5928 // TODO-FIXME:
5929 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5930 // objectmonitor implementation.
5931 // 2. Collapse the JSR166 parker event, and the
5932 // objectmonitor ParkEvent into a single "Event" construct.
5933 // 3. In park() and unpark() add:
5934 // assert (Thread::current() == AssociatedWith).
5935 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5936 // 1-out-of-N park() operations will return immediately.
5937 //
5938 // _Event transitions in park()
5939 // -1 => -1 : illegal
5940 // 1 => 0 : pass - return immediately
5941 // 0 => -1 : block
5942 //
5943 // _Event serves as a restricted-range semaphore.
5944 //
5945 // Another possible encoding of _Event would be with
5946 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5947 //
5948 // TODO-FIXME: add DTRACE probes for:
5949 // 1. Tx parks
5950 // 2. Ty unparks Tx
5951 // 3. Tx resumes from park
5954 // value determined through experimentation
5955 #define ROUNDINGFIX 11
5957 // utility to compute the abstime argument to timedwait.
5958 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5960 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5961 // millis is the relative timeout time
5962 // abstime will be the absolute timeout time
5963 if (millis < 0) millis = 0;
5964 struct timeval now;
5965 int status = gettimeofday(&now, NULL);
5966 assert(status == 0, "gettimeofday");
5967 jlong seconds = millis / 1000;
5968 jlong max_wait_period;
5970 if (UseLWPSynchronization) {
5971 // forward port of fix for 4275818 (not sleeping long enough)
5972 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5973 // _lwp_cond_timedwait() used a round_down algorithm rather
5974 // than a round_up. For millis less than our roundfactor
5975 // it rounded down to 0 which doesn't meet the spec.
5976 // For millis > roundfactor we may return a bit sooner, but
5977 // since we can not accurately identify the patch level and
5978 // this has already been fixed in Solaris 9 and 8 we will
5979 // leave it alone rather than always rounding down.
5981 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5982 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5983 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5984 max_wait_period = 21000000;
5985 } else {
5986 max_wait_period = 50000000;
5987 }
5988 millis %= 1000;
5989 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5990 seconds = max_wait_period;
5991 }
5992 abstime->tv_sec = now.tv_sec + seconds;
5993 long usec = now.tv_usec + millis * 1000;
5994 if (usec >= 1000000) {
5995 abstime->tv_sec += 1;
5996 usec -= 1000000;
5997 }
5998 abstime->tv_nsec = usec * 1000;
5999 return abstime;
6000 }
6002 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
6003 // Conceptually TryPark() should be equivalent to park(0).
6005 int os::PlatformEvent::TryPark() {
6006 for (;;) {
6007 const int v = _Event ;
6008 guarantee ((v == 0) || (v == 1), "invariant") ;
6009 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
6010 }
6011 }
6013 void os::PlatformEvent::park() { // AKA: down()
6014 // Invariant: Only the thread associated with the Event/PlatformEvent
6015 // may call park().
6016 int v ;
6017 for (;;) {
6018 v = _Event ;
6019 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6020 }
6021 guarantee (v >= 0, "invariant") ;
6022 if (v == 0) {
6023 // Do this the hard way by blocking ...
6024 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6025 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6026 // Only for SPARC >= V8PlusA
6027 #if defined(__sparc) && defined(COMPILER2)
6028 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6029 #endif
6030 int status = os::Solaris::mutex_lock(_mutex);
6031 assert_status(status == 0, status, "mutex_lock");
6032 guarantee (_nParked == 0, "invariant") ;
6033 ++ _nParked ;
6034 while (_Event < 0) {
6035 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
6036 // Treat this the same as if the wait was interrupted
6037 // With usr/lib/lwp going to kernel, always handle ETIME
6038 status = os::Solaris::cond_wait(_cond, _mutex);
6039 if (status == ETIME) status = EINTR ;
6040 assert_status(status == 0 || status == EINTR, status, "cond_wait");
6041 }
6042 -- _nParked ;
6043 _Event = 0 ;
6044 status = os::Solaris::mutex_unlock(_mutex);
6045 assert_status(status == 0, status, "mutex_unlock");
6046 // Paranoia to ensure our locked and lock-free paths interact
6047 // correctly with each other.
6048 OrderAccess::fence();
6049 }
6050 }
6052 int os::PlatformEvent::park(jlong millis) {
6053 guarantee (_nParked == 0, "invariant") ;
6054 int v ;
6055 for (;;) {
6056 v = _Event ;
6057 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6058 }
6059 guarantee (v >= 0, "invariant") ;
6060 if (v != 0) return OS_OK ;
6062 int ret = OS_TIMEOUT;
6063 timestruc_t abst;
6064 compute_abstime (&abst, millis);
6066 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6067 // For Solaris SPARC set fprs.FEF=0 prior to parking.
6068 // Only for SPARC >= V8PlusA
6069 #if defined(__sparc) && defined(COMPILER2)
6070 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6071 #endif
6072 int status = os::Solaris::mutex_lock(_mutex);
6073 assert_status(status == 0, status, "mutex_lock");
6074 guarantee (_nParked == 0, "invariant") ;
6075 ++ _nParked ;
6076 while (_Event < 0) {
6077 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
6078 assert_status(status == 0 || status == EINTR ||
6079 status == ETIME || status == ETIMEDOUT,
6080 status, "cond_timedwait");
6081 if (!FilterSpuriousWakeups) break ; // previous semantics
6082 if (status == ETIME || status == ETIMEDOUT) break ;
6083 // We consume and ignore EINTR and spurious wakeups.
6084 }
6085 -- _nParked ;
6086 if (_Event >= 0) ret = OS_OK ;
6087 _Event = 0 ;
6088 status = os::Solaris::mutex_unlock(_mutex);
6089 assert_status(status == 0, status, "mutex_unlock");
6090 // Paranoia to ensure our locked and lock-free paths interact
6091 // correctly with each other.
6092 OrderAccess::fence();
6093 return ret;
6094 }
6096 void os::PlatformEvent::unpark() {
6097 // Transitions for _Event:
6098 // 0 :=> 1
6099 // 1 :=> 1
6100 // -1 :=> either 0 or 1; must signal target thread
6101 // That is, we can safely transition _Event from -1 to either
6102 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
6103 // unpark() calls.
6104 // See also: "Semaphores in Plan 9" by Mullender & Cox
6105 //
6106 // Note: Forcing a transition from "-1" to "1" on an unpark() means
6107 // that it will take two back-to-back park() calls for the owning
6108 // thread to block. This has the benefit of forcing a spurious return
6109 // from the first park() call after an unpark() call which will help
6110 // shake out uses of park() and unpark() without condition variables.
6112 if (Atomic::xchg(1, &_Event) >= 0) return;
6114 // If the thread associated with the event was parked, wake it.
6115 // Wait for the thread assoc with the PlatformEvent to vacate.
6116 int status = os::Solaris::mutex_lock(_mutex);
6117 assert_status(status == 0, status, "mutex_lock");
6118 int AnyWaiters = _nParked;
6119 status = os::Solaris::mutex_unlock(_mutex);
6120 assert_status(status == 0, status, "mutex_unlock");
6121 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
6122 if (AnyWaiters != 0) {
6123 // We intentional signal *after* dropping the lock
6124 // to avoid a common class of futile wakeups.
6125 status = os::Solaris::cond_signal(_cond);
6126 assert_status(status == 0, status, "cond_signal");
6127 }
6128 }
6130 // JSR166
6131 // -------------------------------------------------------
6133 /*
6134 * The solaris and linux implementations of park/unpark are fairly
6135 * conservative for now, but can be improved. They currently use a
6136 * mutex/condvar pair, plus _counter.
6137 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6138 * sets count to 1 and signals condvar. Only one thread ever waits
6139 * on the condvar. Contention seen when trying to park implies that someone
6140 * is unparking you, so don't wait. And spurious returns are fine, so there
6141 * is no need to track notifications.
6142 */
6144 #define MAX_SECS 100000000
6145 /*
6146 * This code is common to linux and solaris and will be moved to a
6147 * common place in dolphin.
6148 *
6149 * The passed in time value is either a relative time in nanoseconds
6150 * or an absolute time in milliseconds. Either way it has to be unpacked
6151 * into suitable seconds and nanoseconds components and stored in the
6152 * given timespec structure.
6153 * Given time is a 64-bit value and the time_t used in the timespec is only
6154 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6155 * overflow if times way in the future are given. Further on Solaris versions
6156 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6157 * number of seconds, in abstime, is less than current_time + 100,000,000.
6158 * As it will be 28 years before "now + 100000000" will overflow we can
6159 * ignore overflow and just impose a hard-limit on seconds using the value
6160 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6161 * years from "now".
6162 */
6163 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6164 assert (time > 0, "convertTime");
6166 struct timeval now;
6167 int status = gettimeofday(&now, NULL);
6168 assert(status == 0, "gettimeofday");
6170 time_t max_secs = now.tv_sec + MAX_SECS;
6172 if (isAbsolute) {
6173 jlong secs = time / 1000;
6174 if (secs > max_secs) {
6175 absTime->tv_sec = max_secs;
6176 }
6177 else {
6178 absTime->tv_sec = secs;
6179 }
6180 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6181 }
6182 else {
6183 jlong secs = time / NANOSECS_PER_SEC;
6184 if (secs >= MAX_SECS) {
6185 absTime->tv_sec = max_secs;
6186 absTime->tv_nsec = 0;
6187 }
6188 else {
6189 absTime->tv_sec = now.tv_sec + secs;
6190 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6191 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6192 absTime->tv_nsec -= NANOSECS_PER_SEC;
6193 ++absTime->tv_sec; // note: this must be <= max_secs
6194 }
6195 }
6196 }
6197 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6198 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6199 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6200 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6201 }
6203 void Parker::park(bool isAbsolute, jlong time) {
6204 // Ideally we'd do something useful while spinning, such
6205 // as calling unpackTime().
6207 // Optional fast-path check:
6208 // Return immediately if a permit is available.
6209 // We depend on Atomic::xchg() having full barrier semantics
6210 // since we are doing a lock-free update to _counter.
6211 if (Atomic::xchg(0, &_counter) > 0) return;
6213 // Optional fast-exit: Check interrupt before trying to wait
6214 Thread* thread = Thread::current();
6215 assert(thread->is_Java_thread(), "Must be JavaThread");
6216 JavaThread *jt = (JavaThread *)thread;
6217 if (Thread::is_interrupted(thread, false)) {
6218 return;
6219 }
6221 // First, demultiplex/decode time arguments
6222 timespec absTime;
6223 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6224 return;
6225 }
6226 if (time > 0) {
6227 // Warning: this code might be exposed to the old Solaris time
6228 // round-down bugs. Grep "roundingFix" for details.
6229 unpackTime(&absTime, isAbsolute, time);
6230 }
6232 // Enter safepoint region
6233 // Beware of deadlocks such as 6317397.
6234 // The per-thread Parker:: _mutex is a classic leaf-lock.
6235 // In particular a thread must never block on the Threads_lock while
6236 // holding the Parker:: mutex. If safepoints are pending both the
6237 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6238 ThreadBlockInVM tbivm(jt);
6240 // Don't wait if cannot get lock since interference arises from
6241 // unblocking. Also. check interrupt before trying wait
6242 if (Thread::is_interrupted(thread, false) ||
6243 os::Solaris::mutex_trylock(_mutex) != 0) {
6244 return;
6245 }
6247 int status ;
6249 if (_counter > 0) { // no wait needed
6250 _counter = 0;
6251 status = os::Solaris::mutex_unlock(_mutex);
6252 assert (status == 0, "invariant") ;
6253 // Paranoia to ensure our locked and lock-free paths interact
6254 // correctly with each other and Java-level accesses.
6255 OrderAccess::fence();
6256 return;
6257 }
6259 #ifdef ASSERT
6260 // Don't catch signals while blocked; let the running threads have the signals.
6261 // (This allows a debugger to break into the running thread.)
6262 sigset_t oldsigs;
6263 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6264 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6265 #endif
6267 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6268 jt->set_suspend_equivalent();
6269 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6271 // Do this the hard way by blocking ...
6272 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6273 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6274 // Only for SPARC >= V8PlusA
6275 #if defined(__sparc) && defined(COMPILER2)
6276 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6277 #endif
6279 if (time == 0) {
6280 status = os::Solaris::cond_wait (_cond, _mutex) ;
6281 } else {
6282 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6283 }
6284 // Note that an untimed cond_wait() can sometimes return ETIME on older
6285 // versions of the Solaris.
6286 assert_status(status == 0 || status == EINTR ||
6287 status == ETIME || status == ETIMEDOUT,
6288 status, "cond_timedwait");
6290 #ifdef ASSERT
6291 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6292 #endif
6293 _counter = 0 ;
6294 status = os::Solaris::mutex_unlock(_mutex);
6295 assert_status(status == 0, status, "mutex_unlock") ;
6296 // Paranoia to ensure our locked and lock-free paths interact
6297 // correctly with each other and Java-level accesses.
6298 OrderAccess::fence();
6300 // If externally suspended while waiting, re-suspend
6301 if (jt->handle_special_suspend_equivalent_condition()) {
6302 jt->java_suspend_self();
6303 }
6304 }
6306 void Parker::unpark() {
6307 int s, status ;
6308 status = os::Solaris::mutex_lock (_mutex) ;
6309 assert (status == 0, "invariant") ;
6310 s = _counter;
6311 _counter = 1;
6312 status = os::Solaris::mutex_unlock (_mutex) ;
6313 assert (status == 0, "invariant") ;
6315 if (s < 1) {
6316 status = os::Solaris::cond_signal (_cond) ;
6317 assert (status == 0, "invariant") ;
6318 }
6319 }
6321 extern char** environ;
6323 // Run the specified command in a separate process. Return its exit value,
6324 // or -1 on failure (e.g. can't fork a new process).
6325 // Unlike system(), this function can be called from signal handler. It
6326 // doesn't block SIGINT et al.
6327 int os::fork_and_exec(char* cmd) {
6328 char * argv[4];
6329 argv[0] = (char *)"sh";
6330 argv[1] = (char *)"-c";
6331 argv[2] = cmd;
6332 argv[3] = NULL;
6334 // fork is async-safe, fork1 is not so can't use in signal handler
6335 pid_t pid;
6336 Thread* t = ThreadLocalStorage::get_thread_slow();
6337 if (t != NULL && t->is_inside_signal_handler()) {
6338 pid = fork();
6339 } else {
6340 pid = fork1();
6341 }
6343 if (pid < 0) {
6344 // fork failed
6345 warning("fork failed: %s", strerror(errno));
6346 return -1;
6348 } else if (pid == 0) {
6349 // child process
6351 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6352 execve("/usr/bin/sh", argv, environ);
6354 // execve failed
6355 _exit(-1);
6357 } else {
6358 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6359 // care about the actual exit code, for now.
6361 int status;
6363 // Wait for the child process to exit. This returns immediately if
6364 // the child has already exited. */
6365 while (waitpid(pid, &status, 0) < 0) {
6366 switch (errno) {
6367 case ECHILD: return 0;
6368 case EINTR: break;
6369 default: return -1;
6370 }
6371 }
6373 if (WIFEXITED(status)) {
6374 // The child exited normally; get its exit code.
6375 return WEXITSTATUS(status);
6376 } else if (WIFSIGNALED(status)) {
6377 // The child exited because of a signal
6378 // The best value to return is 0x80 + signal number,
6379 // because that is what all Unix shells do, and because
6380 // it allows callers to distinguish between process exit and
6381 // process death by signal.
6382 return 0x80 + WTERMSIG(status);
6383 } else {
6384 // Unknown exit code; pass it through
6385 return status;
6386 }
6387 }
6388 }
6390 // is_headless_jre()
6391 //
6392 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6393 // in order to report if we are running in a headless jre
6394 //
6395 // Since JDK8 xawt/libmawt.so was moved into the same directory
6396 // as libawt.so, and renamed libawt_xawt.so
6397 //
6398 bool os::is_headless_jre() {
6399 struct stat statbuf;
6400 char buf[MAXPATHLEN];
6401 char libmawtpath[MAXPATHLEN];
6402 const char *xawtstr = "/xawt/libmawt.so";
6403 const char *new_xawtstr = "/libawt_xawt.so";
6404 char *p;
6406 // Get path to libjvm.so
6407 os::jvm_path(buf, sizeof(buf));
6409 // Get rid of libjvm.so
6410 p = strrchr(buf, '/');
6411 if (p == NULL) return false;
6412 else *p = '\0';
6414 // Get rid of client or server
6415 p = strrchr(buf, '/');
6416 if (p == NULL) return false;
6417 else *p = '\0';
6419 // check xawt/libmawt.so
6420 strcpy(libmawtpath, buf);
6421 strcat(libmawtpath, xawtstr);
6422 if (::stat(libmawtpath, &statbuf) == 0) return false;
6424 // check libawt_xawt.so
6425 strcpy(libmawtpath, buf);
6426 strcat(libmawtpath, new_xawtstr);
6427 if (::stat(libmawtpath, &statbuf) == 0) return false;
6429 return true;
6430 }
6432 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6433 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6434 }
6436 int os::close(int fd) {
6437 return ::close(fd);
6438 }
6440 int os::socket_close(int fd) {
6441 return ::close(fd);
6442 }
6444 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6445 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6446 }
6448 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6449 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6450 }
6452 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6453 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6454 }
6456 // As both poll and select can be interrupted by signals, we have to be
6457 // prepared to restart the system call after updating the timeout, unless
6458 // a poll() is done with timeout == -1, in which case we repeat with this
6459 // "wait forever" value.
6461 int os::timeout(int fd, long timeout) {
6462 int res;
6463 struct timeval t;
6464 julong prevtime, newtime;
6465 static const char* aNull = 0;
6466 struct pollfd pfd;
6467 pfd.fd = fd;
6468 pfd.events = POLLIN;
6470 gettimeofday(&t, &aNull);
6471 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6473 for(;;) {
6474 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6475 if(res == OS_ERR && errno == EINTR) {
6476 if(timeout != -1) {
6477 gettimeofday(&t, &aNull);
6478 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6479 timeout -= newtime - prevtime;
6480 if(timeout <= 0)
6481 return OS_OK;
6482 prevtime = newtime;
6483 }
6484 } else return res;
6485 }
6486 }
6488 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6489 int _result;
6490 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6491 os::Solaris::clear_interrupted);
6493 // Depending on when thread interruption is reset, _result could be
6494 // one of two values when errno == EINTR
6496 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6497 && (errno == EINTR)) {
6498 /* restarting a connect() changes its errno semantics */
6499 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6500 os::Solaris::clear_interrupted);
6501 /* undo these changes */
6502 if (_result == OS_ERR) {
6503 if (errno == EALREADY) {
6504 errno = EINPROGRESS; /* fall through */
6505 } else if (errno == EISCONN) {
6506 errno = 0;
6507 return OS_OK;
6508 }
6509 }
6510 }
6511 return _result;
6512 }
6514 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6515 if (fd < 0) {
6516 return OS_ERR;
6517 }
6518 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6519 os::Solaris::clear_interrupted);
6520 }
6522 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6523 sockaddr* from, socklen_t* fromlen) {
6524 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6525 os::Solaris::clear_interrupted);
6526 }
6528 int os::sendto(int fd, char* buf, size_t len, uint flags,
6529 struct sockaddr* to, socklen_t tolen) {
6530 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6531 os::Solaris::clear_interrupted);
6532 }
6534 int os::socket_available(int fd, jint *pbytes) {
6535 if (fd < 0) {
6536 return OS_OK;
6537 }
6538 int ret;
6539 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6540 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6541 // is expected to return 0 on failure and 1 on success to the jdk.
6542 return (ret == OS_ERR) ? 0 : 1;
6543 }
6545 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6546 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6547 os::Solaris::clear_interrupted);
6548 }
6550 // Get the default path to the core file
6551 // Returns the length of the string
6552 int os::get_core_path(char* buffer, size_t bufferSize) {
6553 const char* p = get_current_directory(buffer, bufferSize);
6555 if (p == NULL) {
6556 assert(p != NULL, "failed to get current directory");
6557 return 0;
6558 }
6560 return strlen(buffer);
6561 }
6563 #ifndef PRODUCT
6564 void TestReserveMemorySpecial_test() {
6565 // No tests available for this platform
6566 }
6567 #endif