1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_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/atomic.inline.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/interfaceSupport.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/orderAccess.inline.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/threadCritical.hpp"
60 #include "runtime/timer.hpp"
61 #include "services/attachListener.hpp"
62 #include "services/memTracker.hpp"
63 #include "services/runtimeService.hpp"
64 #include "utilities/decoder.hpp"
65 #include "utilities/defaultStream.hpp"
66 #include "utilities/events.hpp"
67 #include "utilities/growableArray.hpp"
68 #include "utilities/vmError.hpp"
69
70 // put OS-includes here
71 # include <dlfcn.h>
72 # include <errno.h>
73 # include <exception>
74 # include <link.h>
75 # include <poll.h>
76 # include <pthread.h>
77 # include <pwd.h>
78 # include <schedctl.h>
79 # include <setjmp.h>
80 # include <signal.h>
81 # include <stdio.h>
82 # include <alloca.h>
83 # include <sys/filio.h>
84 # include <sys/ipc.h>
85 # include <sys/lwp.h>
86 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
87 # include <sys/mman.h>
88 # include <sys/processor.h>
89 # include <sys/procset.h>
90 # include <sys/pset.h>
91 # include <sys/resource.h>
92 # include <sys/shm.h>
93 # include <sys/socket.h>
94 # include <sys/stat.h>
95 # include <sys/systeminfo.h>
96 # include <sys/time.h>
97 # include <sys/times.h>
98 # include <sys/types.h>
99 # include <sys/wait.h>
100 # include <sys/utsname.h>
101 # include <thread.h>
102 # include <unistd.h>
103 # include <sys/priocntl.h>
104 # include <sys/rtpriocntl.h>
105 # include <sys/tspriocntl.h>
106 # include <sys/iapriocntl.h>
107 # include <sys/fxpriocntl.h>
108 # include <sys/loadavg.h>
109 # include <string.h>
110 # include <stdio.h>
111
112 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
113 # include <sys/procfs.h> // see comment in <sys/procfs.h>
114
115 #define MAX_PATH (2 * K)
116
117 // for timer info max values which include all bits
118 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
119
120
121 // Here are some liblgrp types from sys/lgrp_user.h to be able to
122 // compile on older systems without this header file.
123
124 #ifndef MADV_ACCESS_LWP
125 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
126 #endif
127 #ifndef MADV_ACCESS_MANY
128 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
129 #endif
130
131 #ifndef LGRP_RSRC_CPU
132 # define LGRP_RSRC_CPU 0 /* CPU resources */
133 #endif
134 #ifndef LGRP_RSRC_MEM
135 # define LGRP_RSRC_MEM 1 /* memory resources */
136 #endif
137
138 // see thr_setprio(3T) for the basis of these numbers
139 #define MinimumPriority 0
140 #define NormalPriority 64
141 #define MaximumPriority 127
142
143 // Values for ThreadPriorityPolicy == 1
144 int prio_policy1[CriticalPriority+1] = {
145 -99999, 0, 16, 32, 48, 64,
146 80, 96, 112, 124, 127, 127 };
147
148 // System parameters used internally
149 static clock_t clock_tics_per_sec = 100;
150
151 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
152 static bool enabled_extended_FILE_stdio = false;
153
154 // For diagnostics to print a message once. see run_periodic_checks
155 static bool check_addr0_done = false;
156 static sigset_t check_signal_done;
157 static bool check_signals = true;
158
159 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
160 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
161
162 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
163
164
165 // "default" initializers for missing libc APIs
166 extern "C" {
167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
169
170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
171 static int lwp_cond_destroy(cond_t *cv) { return 0; }
172 }
173
174 // "default" initializers for pthread-based synchronization
175 extern "C" {
176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
178 }
179
180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
181
182 // Thread Local Storage
183 // This is common to all Solaris platforms so it is defined here,
184 // in this common file.
185 // The declarations are in the os_cpu threadLS*.hpp files.
186 //
187 // Static member initialization for TLS
188 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
189
190 #ifndef PRODUCT
191 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
192
193 int ThreadLocalStorage::_tcacheHit = 0;
194 int ThreadLocalStorage::_tcacheMiss = 0;
195
196 void ThreadLocalStorage::print_statistics() {
197 int total = _tcacheMiss+_tcacheHit;
198 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
199 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
200 }
201 #undef _PCT
202 #endif // PRODUCT
203
204 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
205 int index) {
206 Thread *thread = get_thread_slow();
207 if (thread != NULL) {
208 address sp = os::current_stack_pointer();
209 guarantee(thread->_stack_base == NULL ||
210 (sp <= thread->_stack_base &&
211 sp >= thread->_stack_base - thread->_stack_size) ||
212 is_error_reported(),
213 "sp must be inside of selected thread stack");
214
215 thread->set_self_raw_id(raw_id); // mark for quick retrieval
216 _get_thread_cache[ index ] = thread;
217 }
218 return thread;
219 }
220
221
222 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
223 #define NO_CACHED_THREAD ((Thread*)all_zero)
224
225 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
226
227 // Store the new value before updating the cache to prevent a race
228 // between get_thread_via_cache_slowly() and this store operation.
229 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
230
231 // Update thread cache with new thread if setting on thread create,
232 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
233 uintptr_t raw = pd_raw_thread_id();
234 int ix = pd_cache_index(raw);
235 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
236 }
237
238 void ThreadLocalStorage::pd_init() {
239 for (int i = 0; i < _pd_cache_size; i++) {
240 _get_thread_cache[i] = NO_CACHED_THREAD;
241 }
242 }
243
244 // Invalidate all the caches (happens to be the same as pd_init).
245 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
246
247 #undef NO_CACHED_THREAD
248
249 // END Thread Local Storage
250
251 static inline size_t adjust_stack_size(address base, size_t size) {
252 if ((ssize_t)size < 0) {
253 // 4759953: Compensate for ridiculous stack size.
254 size = max_intx;
255 }
256 if (size > (size_t)base) {
257 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
258 size = (size_t)base;
259 }
260 return size;
261 }
262
263 static inline stack_t get_stack_info() {
264 stack_t st;
265 int retval = thr_stksegment(&st);
266 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
267 assert(retval == 0, "incorrect return value from thr_stksegment");
268 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
269 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
270 return st;
271 }
272
273 address os::current_stack_base() {
274 int r = thr_main() ;
275 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
276 bool is_primordial_thread = r;
277
278 // Workaround 4352906, avoid calls to thr_stksegment by
279 // thr_main after the first one (it looks like we trash
280 // some data, causing the value for ss_sp to be incorrect).
281 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
282 stack_t st = get_stack_info();
283 if (is_primordial_thread) {
284 // cache initial value of stack base
285 os::Solaris::_main_stack_base = (address)st.ss_sp;
286 }
287 return (address)st.ss_sp;
288 } else {
289 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
290 return os::Solaris::_main_stack_base;
291 }
292 }
293
294 size_t os::current_stack_size() {
295 size_t size;
296
297 int r = thr_main() ;
298 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
299 if(!r) {
300 size = get_stack_info().ss_size;
301 } else {
302 struct rlimit limits;
303 getrlimit(RLIMIT_STACK, &limits);
304 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
305 }
306 // base may not be page aligned
307 address base = current_stack_base();
308 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
309 return (size_t)(base - bottom);
310 }
311
312 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
313 return localtime_r(clock, res);
314 }
315
316 // interruptible infrastructure
317
318 // setup_interruptible saves the thread state before going into an
319 // interruptible system call.
320 // The saved state is used to restore the thread to
321 // its former state whether or not an interrupt is received.
322 // Used by classloader os::read
323 // os::restartable_read calls skip this layer and stay in _thread_in_native
324
325 void os::Solaris::setup_interruptible(JavaThread* thread) {
326
327 JavaThreadState thread_state = thread->thread_state();
328
329 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
330 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
331 OSThread* osthread = thread->osthread();
332 osthread->set_saved_interrupt_thread_state(thread_state);
333 thread->frame_anchor()->make_walkable(thread);
334 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
335 }
336
337 // Version of setup_interruptible() for threads that are already in
338 // _thread_blocked. Used by os_sleep().
339 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
340 thread->frame_anchor()->make_walkable(thread);
341 }
342
343 JavaThread* os::Solaris::setup_interruptible() {
344 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
345 setup_interruptible(thread);
346 return thread;
347 }
348
349 void os::Solaris::try_enable_extended_io() {
350 typedef int (*enable_extended_FILE_stdio_t)(int, int);
351
352 if (!UseExtendedFileIO) {
353 return;
354 }
355
356 enable_extended_FILE_stdio_t enabler =
357 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
358 "enable_extended_FILE_stdio");
359 if (enabler) {
360 enabler(-1, -1);
361 }
362 }
363
364
365 #ifdef ASSERT
366
367 JavaThread* os::Solaris::setup_interruptible_native() {
368 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
369 JavaThreadState thread_state = thread->thread_state();
370 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
371 return thread;
372 }
373
374 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
375 JavaThreadState thread_state = thread->thread_state();
376 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
377 }
378 #endif
379
380 // cleanup_interruptible reverses the effects of setup_interruptible
381 // setup_interruptible_already_blocked() does not need any cleanup.
382
383 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
384 OSThread* osthread = thread->osthread();
385
386 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
387 }
388
389 // I/O interruption related counters called in _INTERRUPTIBLE
390
391 void os::Solaris::bump_interrupted_before_count() {
392 RuntimeService::record_interrupted_before_count();
393 }
394
395 void os::Solaris::bump_interrupted_during_count() {
396 RuntimeService::record_interrupted_during_count();
397 }
398
399 static int _processors_online = 0;
400
401 jint os::Solaris::_os_thread_limit = 0;
402 volatile jint os::Solaris::_os_thread_count = 0;
403
404 julong os::available_memory() {
405 return Solaris::available_memory();
406 }
407
408 julong os::Solaris::available_memory() {
409 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
410 }
411
412 julong os::Solaris::_physical_memory = 0;
413
414 julong os::physical_memory() {
415 return Solaris::physical_memory();
416 }
417
418 static hrtime_t first_hrtime = 0;
419 static const hrtime_t hrtime_hz = 1000*1000*1000;
420 static volatile hrtime_t max_hrtime = 0;
421
422
423 void os::Solaris::initialize_system_info() {
424 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
425 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
426 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
427 }
428
429 int os::active_processor_count() {
430 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
431 pid_t pid = getpid();
432 psetid_t pset = PS_NONE;
433 // Are we running in a processor set or is there any processor set around?
434 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
435 uint_t pset_cpus;
436 // Query the number of cpus available to us.
437 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
438 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
439 _processors_online = pset_cpus;
440 return pset_cpus;
441 }
442 }
443 // Otherwise return number of online cpus
444 return online_cpus;
445 }
446
447 static bool find_processors_in_pset(psetid_t pset,
448 processorid_t** id_array,
449 uint_t* id_length) {
450 bool result = false;
451 // Find the number of processors in the processor set.
452 if (pset_info(pset, NULL, id_length, NULL) == 0) {
453 // Make up an array to hold their ids.
454 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
455 // Fill in the array with their processor ids.
456 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
457 result = true;
458 }
459 }
460 return result;
461 }
462
463 // Callers of find_processors_online() must tolerate imprecise results --
464 // the system configuration can change asynchronously because of DR
465 // or explicit psradm operations.
466 //
467 // We also need to take care that the loop (below) terminates as the
468 // number of processors online can change between the _SC_NPROCESSORS_ONLN
469 // request and the loop that builds the list of processor ids. Unfortunately
470 // there's no reliable way to determine the maximum valid processor id,
471 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
472 // man pages, which claim the processor id set is "sparse, but
473 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
474 // exit the loop.
475 //
476 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
477 // not available on S8.0.
478
479 static bool find_processors_online(processorid_t** id_array,
480 uint* id_length) {
481 const processorid_t MAX_PROCESSOR_ID = 100000 ;
482 // Find the number of processors online.
483 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
484 // Make up an array to hold their ids.
485 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
486 // Processors need not be numbered consecutively.
487 long found = 0;
488 processorid_t next = 0;
489 while (found < *id_length && next < MAX_PROCESSOR_ID) {
490 processor_info_t info;
491 if (processor_info(next, &info) == 0) {
492 // NB, PI_NOINTR processors are effectively online ...
493 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
494 (*id_array)[found] = next;
495 found += 1;
496 }
497 }
498 next += 1;
499 }
500 if (found < *id_length) {
501 // The loop above didn't identify the expected number of processors.
502 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
503 // and re-running the loop, above, but there's no guarantee of progress
504 // if the system configuration is in flux. Instead, we just return what
505 // we've got. Note that in the worst case find_processors_online() could
506 // return an empty set. (As a fall-back in the case of the empty set we
507 // could just return the ID of the current processor).
508 *id_length = found ;
509 }
510
511 return true;
512 }
513
514 static bool assign_distribution(processorid_t* id_array,
515 uint id_length,
516 uint* distribution,
517 uint distribution_length) {
518 // We assume we can assign processorid_t's to uint's.
519 assert(sizeof(processorid_t) == sizeof(uint),
520 "can't convert processorid_t to uint");
521 // Quick check to see if we won't succeed.
522 if (id_length < distribution_length) {
523 return false;
524 }
525 // Assign processor ids to the distribution.
526 // Try to shuffle processors to distribute work across boards,
527 // assuming 4 processors per board.
528 const uint processors_per_board = ProcessDistributionStride;
529 // Find the maximum processor id.
530 processorid_t max_id = 0;
531 for (uint m = 0; m < id_length; m += 1) {
532 max_id = MAX2(max_id, id_array[m]);
533 }
534 // The next id, to limit loops.
535 const processorid_t limit_id = max_id + 1;
536 // Make up markers for available processors.
537 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
538 for (uint c = 0; c < limit_id; c += 1) {
539 available_id[c] = false;
540 }
541 for (uint a = 0; a < id_length; a += 1) {
542 available_id[id_array[a]] = true;
543 }
544 // Step by "boards", then by "slot", copying to "assigned".
545 // NEEDS_CLEANUP: The assignment of processors should be stateful,
546 // remembering which processors have been assigned by
547 // previous calls, etc., so as to distribute several
548 // independent calls of this method. What we'd like is
549 // It would be nice to have an API that let us ask
550 // how many processes are bound to a processor,
551 // but we don't have that, either.
552 // In the short term, "board" is static so that
553 // subsequent distributions don't all start at board 0.
554 static uint board = 0;
555 uint assigned = 0;
556 // Until we've found enough processors ....
557 while (assigned < distribution_length) {
558 // ... find the next available processor in the board.
559 for (uint slot = 0; slot < processors_per_board; slot += 1) {
560 uint try_id = board * processors_per_board + slot;
561 if ((try_id < limit_id) && (available_id[try_id] == true)) {
562 distribution[assigned] = try_id;
563 available_id[try_id] = false;
564 assigned += 1;
565 break;
566 }
567 }
568 board += 1;
569 if (board * processors_per_board + 0 >= limit_id) {
570 board = 0;
571 }
572 }
573 if (available_id != NULL) {
574 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
575 }
576 return true;
577 }
578
579 void os::set_native_thread_name(const char *name) {
580 // Not yet implemented.
581 return;
582 }
583
584 bool os::distribute_processes(uint length, uint* distribution) {
585 bool result = false;
586 // Find the processor id's of all the available CPUs.
587 processorid_t* id_array = NULL;
588 uint id_length = 0;
589 // There are some races between querying information and using it,
590 // since processor sets can change dynamically.
591 psetid_t pset = PS_NONE;
592 // Are we running in a processor set?
593 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
594 result = find_processors_in_pset(pset, &id_array, &id_length);
595 } else {
596 result = find_processors_online(&id_array, &id_length);
597 }
598 if (result == true) {
599 if (id_length >= length) {
600 result = assign_distribution(id_array, id_length, distribution, length);
601 } else {
602 result = false;
603 }
604 }
605 if (id_array != NULL) {
606 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
607 }
608 return result;
609 }
610
611 bool os::bind_to_processor(uint processor_id) {
612 // We assume that a processorid_t can be stored in a uint.
613 assert(sizeof(uint) == sizeof(processorid_t),
614 "can't convert uint to processorid_t");
615 int bind_result =
616 processor_bind(P_LWPID, // bind LWP.
617 P_MYID, // bind current LWP.
618 (processorid_t) processor_id, // id.
619 NULL); // don't return old binding.
620 return (bind_result == 0);
621 }
622
623 bool os::getenv(const char* name, char* buffer, int len) {
624 char* val = ::getenv( name );
625 if ( val == NULL
626 || strlen(val) + 1 > len ) {
627 if (len > 0) buffer[0] = 0; // return a null string
628 return false;
629 }
630 strcpy( buffer, val );
631 return true;
632 }
633
634
635 // Return true if user is running as root.
636
637 bool os::have_special_privileges() {
638 static bool init = false;
639 static bool privileges = false;
640 if (!init) {
641 privileges = (getuid() != geteuid()) || (getgid() != getegid());
642 init = true;
643 }
644 return privileges;
645 }
646
647
648 void os::init_system_properties_values() {
649 // The next steps are taken in the product version:
650 //
651 // Obtain the JAVA_HOME value from the location of libjvm.so.
652 // This library should be located at:
653 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
654 //
655 // If "/jre/lib/" appears at the right place in the path, then we
656 // assume libjvm.so is installed in a JDK and we use this path.
657 //
658 // Otherwise exit with message: "Could not create the Java virtual machine."
659 //
660 // The following extra steps are taken in the debugging version:
661 //
662 // If "/jre/lib/" does NOT appear at the right place in the path
663 // instead of exit check for $JAVA_HOME environment variable.
664 //
665 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
666 // then we append a fake suffix "hotspot/libjvm.so" to this path so
667 // it looks like libjvm.so is installed there
668 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
669 //
670 // Otherwise exit.
671 //
672 // Important note: if the location of libjvm.so changes this
673 // code needs to be changed accordingly.
674
675 // Base path of extensions installed on the system.
676 #define SYS_EXT_DIR "/usr/jdk/packages"
677 #define EXTENSIONS_DIR "/lib/ext"
678 #define ENDORSED_DIR "/lib/endorsed"
679
680 char cpu_arch[12];
681 // Buffer that fits several sprintfs.
682 // Note that the space for the colon and the trailing null are provided
683 // by the nulls included by the sizeof operator.
684 const size_t bufsize =
685 MAX4((size_t)MAXPATHLEN, // For dll_dir & friends.
686 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
687 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
688 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
689 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
690
691 // sysclasspath, java_home, dll_dir
692 {
693 char *pslash;
694 os::jvm_path(buf, bufsize);
695
696 // Found the full path to libjvm.so.
697 // Now cut the path to <java_home>/jre if we can.
698 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
699 pslash = strrchr(buf, '/');
700 if (pslash != NULL) {
701 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
702 }
703 Arguments::set_dll_dir(buf);
704
705 if (pslash != NULL) {
706 pslash = strrchr(buf, '/');
707 if (pslash != NULL) {
708 *pslash = '\0'; // Get rid of /<arch>.
709 pslash = strrchr(buf, '/');
710 if (pslash != NULL) {
711 *pslash = '\0'; // Get rid of /lib.
712 }
713 }
714 }
715 Arguments::set_java_home(buf);
716 set_boot_path('/', ':');
717 }
718
719 // Where to look for native libraries.
720 {
721 // Use dlinfo() to determine the correct java.library.path.
722 //
723 // If we're launched by the Java launcher, and the user
724 // does not set java.library.path explicitly on the commandline,
725 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
726 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
727 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
728 // /usr/lib), which is exactly what we want.
729 //
730 // If the user does set java.library.path, it completely
731 // overwrites this setting, and always has.
732 //
733 // If we're not launched by the Java launcher, we may
734 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
735 // settings. Again, dlinfo does exactly what we want.
736
737 Dl_serinfo info_sz, *info = &info_sz;
738 Dl_serpath *path;
739 char *library_path;
740 char *common_path = buf;
741
742 // Determine search path count and required buffer size.
743 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
744 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
745 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
746 }
747
748 // Allocate new buffer and initialize.
749 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
750 info->dls_size = info_sz.dls_size;
751 info->dls_cnt = info_sz.dls_cnt;
752
753 // Obtain search path information.
754 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
755 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
756 FREE_C_HEAP_ARRAY(char, info, mtInternal);
757 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
758 }
759
760 path = &info->dls_serpath[0];
761
762 // Note: Due to a legacy implementation, most of the library path
763 // is set in the launcher. This was to accomodate linking restrictions
764 // on legacy Solaris implementations (which are no longer supported).
765 // Eventually, all the library path setting will be done here.
766 //
767 // However, to prevent the proliferation of improperly built native
768 // libraries, the new path component /usr/jdk/packages is added here.
769
770 // Determine the actual CPU architecture.
771 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
772 #ifdef _LP64
773 // If we are a 64-bit vm, perform the following translations:
774 // sparc -> sparcv9
775 // i386 -> amd64
776 if (strcmp(cpu_arch, "sparc") == 0) {
777 strcat(cpu_arch, "v9");
778 } else if (strcmp(cpu_arch, "i386") == 0) {
779 strcpy(cpu_arch, "amd64");
780 }
781 #endif
782
783 // Construct the invariant part of ld_library_path.
784 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
785
786 // Struct size is more than sufficient for the path components obtained
787 // through the dlinfo() call, so only add additional space for the path
788 // components explicitly added here.
789 size_t library_path_size = info->dls_size + strlen(common_path);
790 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
791 library_path[0] = '\0';
792
793 // Construct the desired Java library path from the linker's library
794 // search path.
795 //
796 // For compatibility, it is optimal that we insert the additional path
797 // components specific to the Java VM after those components specified
798 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
799 // infrastructure.
800 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
801 strcpy(library_path, common_path);
802 } else {
803 int inserted = 0;
804 int i;
805 for (i = 0; i < info->dls_cnt; i++, path++) {
806 uint_t flags = path->dls_flags & LA_SER_MASK;
807 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
808 strcat(library_path, common_path);
809 strcat(library_path, os::path_separator());
810 inserted = 1;
811 }
812 strcat(library_path, path->dls_name);
813 strcat(library_path, os::path_separator());
814 }
815 // Eliminate trailing path separator.
816 library_path[strlen(library_path)-1] = '\0';
817 }
818
819 // happens before argument parsing - can't use a trace flag
820 // tty->print_raw("init_system_properties_values: native lib path: ");
821 // tty->print_raw_cr(library_path);
822
823 // Callee copies into its own buffer.
824 Arguments::set_library_path(library_path);
825
826 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
827 FREE_C_HEAP_ARRAY(char, info, mtInternal);
828 }
829
830 // Extensions directories.
831 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
832 Arguments::set_ext_dirs(buf);
833
834 // Endorsed standards default directory.
835 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
836 Arguments::set_endorsed_dirs(buf);
837
838 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
839
840 #undef SYS_EXT_DIR
841 #undef EXTENSIONS_DIR
842 #undef ENDORSED_DIR
843 }
844
845 void os::breakpoint() {
846 BREAKPOINT;
847 }
848
849 bool os::obsolete_option(const JavaVMOption *option)
850 {
851 if (!strncmp(option->optionString, "-Xt", 3)) {
852 return true;
853 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
854 return true;
855 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
856 return true;
857 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
858 return true;
859 }
860 return false;
861 }
862
863 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
864 address stackStart = (address)thread->stack_base();
865 address stackEnd = (address)(stackStart - (address)thread->stack_size());
866 if (sp < stackStart && sp >= stackEnd ) return true;
867 return false;
868 }
869
870 extern "C" void breakpoint() {
871 // use debugger to set breakpoint here
872 }
873
874 static thread_t main_thread;
875
876 // Thread start routine for all new Java threads
877 extern "C" void* java_start(void* thread_addr) {
878 // Try to randomize the cache line index of hot stack frames.
879 // This helps when threads of the same stack traces evict each other's
880 // cache lines. The threads can be either from the same JVM instance, or
881 // from different JVM instances. The benefit is especially true for
882 // processors with hyperthreading technology.
883 static int counter = 0;
884 int pid = os::current_process_id();
885 alloca(((pid ^ counter++) & 7) * 128);
886
887 int prio;
888 Thread* thread = (Thread*)thread_addr;
889 OSThread* osthr = thread->osthread();
890
891 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
892 thread->_schedctl = (void *) schedctl_init () ;
893
894 if (UseNUMA) {
895 int lgrp_id = os::numa_get_group_id();
896 if (lgrp_id != -1) {
897 thread->set_lgrp_id(lgrp_id);
898 }
899 }
900
901 // If the creator called set priority before we started,
902 // we need to call set_native_priority now that we have an lwp.
903 // We used to get the priority from thr_getprio (we called
904 // thr_setprio way back in create_thread) and pass it to
905 // set_native_priority, but Solaris scales the priority
906 // in java_to_os_priority, so when we read it back here,
907 // we pass trash to set_native_priority instead of what's
908 // in java_to_os_priority. So we save the native priority
909 // in the osThread and recall it here.
910
911 if ( osthr->thread_id() != -1 ) {
912 if ( UseThreadPriorities ) {
913 int prio = osthr->native_priority();
914 if (ThreadPriorityVerbose) {
915 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
916 INTPTR_FORMAT ", setting priority: %d\n",
917 osthr->thread_id(), osthr->lwp_id(), prio);
918 }
919 os::set_native_priority(thread, prio);
920 }
921 } else if (ThreadPriorityVerbose) {
922 warning("Can't set priority in _start routine, thread id hasn't been set\n");
923 }
924
925 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
926
927 // initialize signal mask for this thread
928 os::Solaris::hotspot_sigmask(thread);
929
930 thread->run();
931
932 // One less thread is executing
933 // When the VMThread gets here, the main thread may have already exited
934 // which frees the CodeHeap containing the Atomic::dec code
935 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
936 Atomic::dec(&os::Solaris::_os_thread_count);
937 }
938
939 if (UseDetachedThreads) {
940 thr_exit(NULL);
941 ShouldNotReachHere();
942 }
943 return NULL;
944 }
945
946 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
947 // Allocate the OSThread object
948 OSThread* osthread = new OSThread(NULL, NULL);
949 if (osthread == NULL) return NULL;
950
951 // Store info on the Solaris thread into the OSThread
952 osthread->set_thread_id(thread_id);
953 osthread->set_lwp_id(_lwp_self());
954 thread->_schedctl = (void *) schedctl_init () ;
955
956 if (UseNUMA) {
957 int lgrp_id = os::numa_get_group_id();
958 if (lgrp_id != -1) {
959 thread->set_lgrp_id(lgrp_id);
960 }
961 }
962
963 if ( ThreadPriorityVerbose ) {
964 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
965 osthread->thread_id(), osthread->lwp_id() );
966 }
967
968 // Initial thread state is INITIALIZED, not SUSPENDED
969 osthread->set_state(INITIALIZED);
970
971 return osthread;
972 }
973
974 void os::Solaris::hotspot_sigmask(Thread* thread) {
975
976 //Save caller's signal mask
977 sigset_t sigmask;
978 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
979 OSThread *osthread = thread->osthread();
980 osthread->set_caller_sigmask(sigmask);
981
982 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
983 if (!ReduceSignalUsage) {
984 if (thread->is_VM_thread()) {
985 // Only the VM thread handles BREAK_SIGNAL ...
986 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
987 } else {
988 // ... all other threads block BREAK_SIGNAL
989 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
990 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
991 }
992 }
993 }
994
995 bool os::create_attached_thread(JavaThread* thread) {
996 #ifdef ASSERT
997 thread->verify_not_published();
998 #endif
999 OSThread* osthread = create_os_thread(thread, thr_self());
1000 if (osthread == NULL) {
1001 return false;
1002 }
1003
1004 // Initial thread state is RUNNABLE
1005 osthread->set_state(RUNNABLE);
1006 thread->set_osthread(osthread);
1007
1008 // initialize signal mask for this thread
1009 // and save the caller's signal mask
1010 os::Solaris::hotspot_sigmask(thread);
1011
1012 return true;
1013 }
1014
1015 bool os::create_main_thread(JavaThread* thread) {
1016 #ifdef ASSERT
1017 thread->verify_not_published();
1018 #endif
1019 if (_starting_thread == NULL) {
1020 _starting_thread = create_os_thread(thread, main_thread);
1021 if (_starting_thread == NULL) {
1022 return false;
1023 }
1024 }
1025
1026 // The primodial thread is runnable from the start
1027 _starting_thread->set_state(RUNNABLE);
1028
1029 thread->set_osthread(_starting_thread);
1030
1031 // initialize signal mask for this thread
1032 // and save the caller's signal mask
1033 os::Solaris::hotspot_sigmask(thread);
1034
1035 return true;
1036 }
1037
1038 // _T2_libthread is true if we believe we are running with the newer
1039 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1040 bool os::Solaris::_T2_libthread = false;
1041
1042 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1043 // Allocate the OSThread object
1044 OSThread* osthread = new OSThread(NULL, NULL);
1045 if (osthread == NULL) {
1046 return false;
1047 }
1048
1049 if ( ThreadPriorityVerbose ) {
1050 char *thrtyp;
1051 switch ( thr_type ) {
1052 case vm_thread:
1053 thrtyp = (char *)"vm";
1054 break;
1055 case cgc_thread:
1056 thrtyp = (char *)"cgc";
1057 break;
1058 case pgc_thread:
1059 thrtyp = (char *)"pgc";
1060 break;
1061 case java_thread:
1062 thrtyp = (char *)"java";
1063 break;
1064 case compiler_thread:
1065 thrtyp = (char *)"compiler";
1066 break;
1067 case watcher_thread:
1068 thrtyp = (char *)"watcher";
1069 break;
1070 default:
1071 thrtyp = (char *)"unknown";
1072 break;
1073 }
1074 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1075 }
1076
1077 // Calculate stack size if it's not specified by caller.
1078 if (stack_size == 0) {
1079 // The default stack size 1M (2M for LP64).
1080 stack_size = (BytesPerWord >> 2) * K * K;
1081
1082 switch (thr_type) {
1083 case os::java_thread:
1084 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1085 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1086 break;
1087 case os::compiler_thread:
1088 if (CompilerThreadStackSize > 0) {
1089 stack_size = (size_t)(CompilerThreadStackSize * K);
1090 break;
1091 } // else fall through:
1092 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1093 case os::vm_thread:
1094 case os::pgc_thread:
1095 case os::cgc_thread:
1096 case os::watcher_thread:
1097 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1098 break;
1099 }
1100 }
1101 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1102
1103 // Initial state is ALLOCATED but not INITIALIZED
1104 osthread->set_state(ALLOCATED);
1105
1106 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1107 // We got lots of threads. Check if we still have some address space left.
1108 // Need to be at least 5Mb of unreserved address space. We do check by
1109 // trying to reserve some.
1110 const size_t VirtualMemoryBangSize = 20*K*K;
1111 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1112 if (mem == NULL) {
1113 delete osthread;
1114 return false;
1115 } else {
1116 // Release the memory again
1117 os::release_memory(mem, VirtualMemoryBangSize);
1118 }
1119 }
1120
1121 // Setup osthread because the child thread may need it.
1122 thread->set_osthread(osthread);
1123
1124 // Create the Solaris thread
1125 // explicit THR_BOUND for T2_libthread case in case
1126 // that assumption is not accurate, but our alternate signal stack
1127 // handling is based on it which must have bound threads
1128 thread_t tid = 0;
1129 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1130 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1131 (thr_type == vm_thread) ||
1132 (thr_type == cgc_thread) ||
1133 (thr_type == pgc_thread) ||
1134 (thr_type == compiler_thread && BackgroundCompilation)) ?
1135 THR_BOUND : 0);
1136 int status;
1137
1138 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1139 //
1140 // On multiprocessors systems, libthread sometimes under-provisions our
1141 // process with LWPs. On a 30-way systems, for instance, we could have
1142 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1143 // to our process. This can result in under utilization of PEs.
1144 // I suspect the problem is related to libthread's LWP
1145 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1146 // upcall policy.
1147 //
1148 // The following code is palliative -- it attempts to ensure that our
1149 // process has sufficient LWPs to take advantage of multiple PEs.
1150 // Proper long-term cures include using user-level threads bound to LWPs
1151 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1152 // slight timing window with respect to sampling _os_thread_count, but
1153 // the race is benign. Also, we should periodically recompute
1154 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1155 // the number of PEs in our partition. You might be tempted to use
1156 // THR_NEW_LWP here, but I'd recommend against it as that could
1157 // result in undesirable growth of the libthread's LWP pool.
1158 // The fix below isn't sufficient; for instance, it doesn't take into count
1159 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1160 //
1161 // Some pathologies this scheme doesn't handle:
1162 // * Threads can block, releasing the LWPs. The LWPs can age out.
1163 // When a large number of threads become ready again there aren't
1164 // enough LWPs available to service them. This can occur when the
1165 // number of ready threads oscillates.
1166 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1167 //
1168 // Finally, we should call thr_setconcurrency() periodically to refresh
1169 // the LWP pool and thwart the LWP age-out mechanism.
1170 // The "+3" term provides a little slop -- we want to slightly overprovision.
1171
1172 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1173 if (!(flags & THR_BOUND)) {
1174 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1175 }
1176 }
1177 // Although this doesn't hurt, we should warn of undefined behavior
1178 // when using unbound T1 threads with schedctl(). This should never
1179 // happen, as the compiler and VM threads are always created bound
1180 DEBUG_ONLY(
1181 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1182 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1183 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1184 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1185 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1186 }
1187 );
1188
1189
1190 // Mark that we don't have an lwp or thread id yet.
1191 // In case we attempt to set the priority before the thread starts.
1192 osthread->set_lwp_id(-1);
1193 osthread->set_thread_id(-1);
1194
1195 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1196 if (status != 0) {
1197 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1198 perror("os::create_thread");
1199 }
1200 thread->set_osthread(NULL);
1201 // Need to clean up stuff we've allocated so far
1202 delete osthread;
1203 return false;
1204 }
1205
1206 Atomic::inc(&os::Solaris::_os_thread_count);
1207
1208 // Store info on the Solaris thread into the OSThread
1209 osthread->set_thread_id(tid);
1210
1211 // Remember that we created this thread so we can set priority on it
1212 osthread->set_vm_created();
1213
1214 // Set the default thread priority. If using bound threads, setting
1215 // lwp priority will be delayed until thread start.
1216 set_native_priority(thread,
1217 DefaultThreadPriority == -1 ?
1218 java_to_os_priority[NormPriority] :
1219 DefaultThreadPriority);
1220
1221 // Initial thread state is INITIALIZED, not SUSPENDED
1222 osthread->set_state(INITIALIZED);
1223
1224 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1225 return true;
1226 }
1227
1228 /* defined for >= Solaris 10. This allows builds on earlier versions
1229 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1230 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1231 * and -XX:+UseAltSigs does nothing since these should have no conflict
1232 */
1233 #if !defined(SIGJVM1)
1234 #define SIGJVM1 39
1235 #define SIGJVM2 40
1236 #endif
1237
1238 debug_only(static bool signal_sets_initialized = false);
1239 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1240 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1241 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1242
1243 bool os::Solaris::is_sig_ignored(int sig) {
1244 struct sigaction oact;
1245 sigaction(sig, (struct sigaction*)NULL, &oact);
1246 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1247 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1248 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1249 return true;
1250 else
1251 return false;
1252 }
1253
1254 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1255 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1256 static bool isJVM1available() {
1257 return SIGJVM1 < SIGRTMIN;
1258 }
1259
1260 void os::Solaris::signal_sets_init() {
1261 // Should also have an assertion stating we are still single-threaded.
1262 assert(!signal_sets_initialized, "Already initialized");
1263 // Fill in signals that are necessarily unblocked for all threads in
1264 // the VM. Currently, we unblock the following signals:
1265 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1266 // by -Xrs (=ReduceSignalUsage));
1267 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1268 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1269 // the dispositions or masks wrt these signals.
1270 // Programs embedding the VM that want to use the above signals for their
1271 // own purposes must, at this time, use the "-Xrs" option to prevent
1272 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1273 // (See bug 4345157, and other related bugs).
1274 // In reality, though, unblocking these signals is really a nop, since
1275 // these signals are not blocked by default.
1276 sigemptyset(&unblocked_sigs);
1277 sigemptyset(&allowdebug_blocked_sigs);
1278 sigaddset(&unblocked_sigs, SIGILL);
1279 sigaddset(&unblocked_sigs, SIGSEGV);
1280 sigaddset(&unblocked_sigs, SIGBUS);
1281 sigaddset(&unblocked_sigs, SIGFPE);
1282
1283 if (isJVM1available) {
1284 os::Solaris::set_SIGinterrupt(SIGJVM1);
1285 os::Solaris::set_SIGasync(SIGJVM2);
1286 } else if (UseAltSigs) {
1287 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1288 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1289 } else {
1290 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1291 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1292 }
1293
1294 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1295 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1296
1297 if (!ReduceSignalUsage) {
1298 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1299 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1300 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1301 }
1302 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1303 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1304 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1305 }
1306 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1307 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1308 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1309 }
1310 }
1311 // Fill in signals that are blocked by all but the VM thread.
1312 sigemptyset(&vm_sigs);
1313 if (!ReduceSignalUsage)
1314 sigaddset(&vm_sigs, BREAK_SIGNAL);
1315 debug_only(signal_sets_initialized = true);
1316
1317 // For diagnostics only used in run_periodic_checks
1318 sigemptyset(&check_signal_done);
1319 }
1320
1321 // These are signals that are unblocked while a thread is running Java.
1322 // (For some reason, they get blocked by default.)
1323 sigset_t* os::Solaris::unblocked_signals() {
1324 assert(signal_sets_initialized, "Not initialized");
1325 return &unblocked_sigs;
1326 }
1327
1328 // These are the signals that are blocked while a (non-VM) thread is
1329 // running Java. Only the VM thread handles these signals.
1330 sigset_t* os::Solaris::vm_signals() {
1331 assert(signal_sets_initialized, "Not initialized");
1332 return &vm_sigs;
1333 }
1334
1335 // These are signals that are blocked during cond_wait to allow debugger in
1336 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1337 assert(signal_sets_initialized, "Not initialized");
1338 return &allowdebug_blocked_sigs;
1339 }
1340
1341
1342 void _handle_uncaught_cxx_exception() {
1343 VMError err("An uncaught C++ exception");
1344 err.report_and_die();
1345 }
1346
1347
1348 // First crack at OS-specific initialization, from inside the new thread.
1349 void os::initialize_thread(Thread* thr) {
1350 int r = thr_main() ;
1351 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1352 if (r) {
1353 JavaThread* jt = (JavaThread *)thr;
1354 assert(jt != NULL,"Sanity check");
1355 size_t stack_size;
1356 address base = jt->stack_base();
1357 if (Arguments::created_by_java_launcher()) {
1358 // Use 2MB to allow for Solaris 7 64 bit mode.
1359 stack_size = JavaThread::stack_size_at_create() == 0
1360 ? 2048*K : JavaThread::stack_size_at_create();
1361
1362 // There are rare cases when we may have already used more than
1363 // the basic stack size allotment before this method is invoked.
1364 // Attempt to allow for a normally sized java_stack.
1365 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1366 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1367 } else {
1368 // 6269555: If we were not created by a Java launcher, i.e. if we are
1369 // running embedded in a native application, treat the primordial thread
1370 // as much like a native attached thread as possible. This means using
1371 // the current stack size from thr_stksegment(), unless it is too large
1372 // to reliably setup guard pages. A reasonable max size is 8MB.
1373 size_t current_size = current_stack_size();
1374 // This should never happen, but just in case....
1375 if (current_size == 0) current_size = 2 * K * K;
1376 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1377 }
1378 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1379 stack_size = (size_t)(base - bottom);
1380
1381 assert(stack_size > 0, "Stack size calculation problem");
1382
1383 if (stack_size > jt->stack_size()) {
1384 NOT_PRODUCT(
1385 struct rlimit limits;
1386 getrlimit(RLIMIT_STACK, &limits);
1387 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1388 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1389 )
1390 tty->print_cr(
1391 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1392 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1393 "See limit(1) to increase the stack size limit.",
1394 stack_size / K, jt->stack_size() / K);
1395 vm_exit(1);
1396 }
1397 assert(jt->stack_size() >= stack_size,
1398 "Attempt to map more stack than was allocated");
1399 jt->set_stack_size(stack_size);
1400 }
1401
1402 // 5/22/01: Right now alternate signal stacks do not handle
1403 // throwing stack overflow exceptions, see bug 4463178
1404 // Until a fix is found for this, T2 will NOT imply alternate signal
1405 // stacks.
1406 // If using T2 libthread threads, install an alternate signal stack.
1407 // Because alternate stacks associate with LWPs on Solaris,
1408 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1409 // we prefer to explicitly stack bang.
1410 // If not using T2 libthread, but using UseBoundThreads any threads
1411 // (primordial thread, jni_attachCurrentThread) we do not create,
1412 // probably are not bound, therefore they can not have an alternate
1413 // signal stack. Since our stack banging code is generated and
1414 // is shared across threads, all threads must be bound to allow
1415 // using alternate signal stacks. The alternative is to interpose
1416 // on _lwp_create to associate an alt sig stack with each LWP,
1417 // and this could be a problem when the JVM is embedded.
1418 // We would prefer to use alternate signal stacks with T2
1419 // Since there is currently no accurate way to detect T2
1420 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1421 // on installing alternate signal stacks
1422
1423
1424 // 05/09/03: removed alternate signal stack support for Solaris
1425 // The alternate signal stack mechanism is no longer needed to
1426 // handle stack overflow. This is now handled by allocating
1427 // guard pages (red zone) and stackbanging.
1428 // Initially the alternate signal stack mechanism was removed because
1429 // it did not work with T1 llibthread. Alternate
1430 // signal stacks MUST have all threads bound to lwps. Applications
1431 // can create their own threads and attach them without their being
1432 // bound under T1. This is frequently the case for the primordial thread.
1433 // If we were ever to reenable this mechanism we would need to
1434 // use the dynamic check for T2 libthread.
1435
1436 os::Solaris::init_thread_fpu_state();
1437 std::set_terminate(_handle_uncaught_cxx_exception);
1438 }
1439
1440
1441
1442 // Free Solaris resources related to the OSThread
1443 void os::free_thread(OSThread* osthread) {
1444 assert(osthread != NULL, "os::free_thread but osthread not set");
1445
1446
1447 // We are told to free resources of the argument thread,
1448 // but we can only really operate on the current thread.
1449 // The main thread must take the VMThread down synchronously
1450 // before the main thread exits and frees up CodeHeap
1451 guarantee((Thread::current()->osthread() == osthread
1452 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1453 if (Thread::current()->osthread() == osthread) {
1454 // Restore caller's signal mask
1455 sigset_t sigmask = osthread->caller_sigmask();
1456 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1457 }
1458 delete osthread;
1459 }
1460
1461 void os::pd_start_thread(Thread* thread) {
1462 int status = thr_continue(thread->osthread()->thread_id());
1463 assert_status(status == 0, status, "thr_continue failed");
1464 }
1465
1466
1467 intx os::current_thread_id() {
1468 return (intx)thr_self();
1469 }
1470
1471 static pid_t _initial_pid = 0;
1472
1473 int os::current_process_id() {
1474 return (int)(_initial_pid ? _initial_pid : getpid());
1475 }
1476
1477 int os::allocate_thread_local_storage() {
1478 // %%% in Win32 this allocates a memory segment pointed to by a
1479 // register. Dan Stein can implement a similar feature in
1480 // Solaris. Alternatively, the VM can do the same thing
1481 // explicitly: malloc some storage and keep the pointer in a
1482 // register (which is part of the thread's context) (or keep it
1483 // in TLS).
1484 // %%% In current versions of Solaris, thr_self and TSD can
1485 // be accessed via short sequences of displaced indirections.
1486 // The value of thr_self is available as %g7(36).
1487 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1488 // assuming that the current thread already has a value bound to k.
1489 // It may be worth experimenting with such access patterns,
1490 // and later having the parameters formally exported from a Solaris
1491 // interface. I think, however, that it will be faster to
1492 // maintain the invariant that %g2 always contains the
1493 // JavaThread in Java code, and have stubs simply
1494 // treat %g2 as a caller-save register, preserving it in a %lN.
1495 thread_key_t tk;
1496 if (thr_keycreate( &tk, NULL ) )
1497 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1498 "(%s)", strerror(errno)));
1499 return int(tk);
1500 }
1501
1502 void os::free_thread_local_storage(int index) {
1503 // %%% don't think we need anything here
1504 // if ( pthread_key_delete((pthread_key_t) tk) )
1505 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1506 }
1507
1508 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1509 // small number - point is NO swap space available
1510 void os::thread_local_storage_at_put(int index, void* value) {
1511 // %%% this is used only in threadLocalStorage.cpp
1512 if (thr_setspecific((thread_key_t)index, value)) {
1513 if (errno == ENOMEM) {
1514 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR,
1515 "thr_setspecific: out of swap space");
1516 } else {
1517 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1518 "(%s)", strerror(errno)));
1519 }
1520 } else {
1521 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1522 }
1523 }
1524
1525 // This function could be called before TLS is initialized, for example, when
1526 // VM receives an async signal or when VM causes a fatal error during
1527 // initialization. Return NULL if thr_getspecific() fails.
1528 void* os::thread_local_storage_at(int index) {
1529 // %%% this is used only in threadLocalStorage.cpp
1530 void* r = NULL;
1531 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1532 }
1533
1534
1535 // gethrtime() should be monotonic according to the documentation,
1536 // but some virtualized platforms are known to break this guarantee.
1537 // getTimeNanos() must be guaranteed not to move backwards, so we
1538 // are forced to add a check here.
1539 inline hrtime_t getTimeNanos() {
1540 const hrtime_t now = gethrtime();
1541 const hrtime_t prev = max_hrtime;
1542 if (now <= prev) {
1543 return prev; // same or retrograde time;
1544 }
1545 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1546 assert(obsv >= prev, "invariant"); // Monotonicity
1547 // If the CAS succeeded then we're done and return "now".
1548 // If the CAS failed and the observed value "obsv" is >= now then
1549 // we should return "obsv". If the CAS failed and now > obsv > prv then
1550 // some other thread raced this thread and installed a new value, in which case
1551 // we could either (a) retry the entire operation, (b) retry trying to install now
1552 // or (c) just return obsv. We use (c). No loop is required although in some cases
1553 // we might discard a higher "now" value in deference to a slightly lower but freshly
1554 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1555 // to (a) or (b) -- and greatly reduces coherence traffic.
1556 // We might also condition (c) on the magnitude of the delta between obsv and now.
1557 // Avoiding excessive CAS operations to hot RW locations is critical.
1558 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1559 return (prev == obsv) ? now : obsv;
1560 }
1561
1562 // Time since start-up in seconds to a fine granularity.
1563 // Used by VMSelfDestructTimer and the MemProfiler.
1564 double os::elapsedTime() {
1565 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1566 }
1567
1568 jlong os::elapsed_counter() {
1569 return (jlong)(getTimeNanos() - first_hrtime);
1570 }
1571
1572 jlong os::elapsed_frequency() {
1573 return hrtime_hz;
1574 }
1575
1576 // Return the real, user, and system times in seconds from an
1577 // arbitrary fixed point in the past.
1578 bool os::getTimesSecs(double* process_real_time,
1579 double* process_user_time,
1580 double* process_system_time) {
1581 struct tms ticks;
1582 clock_t real_ticks = times(&ticks);
1583
1584 if (real_ticks == (clock_t) (-1)) {
1585 return false;
1586 } else {
1587 double ticks_per_second = (double) clock_tics_per_sec;
1588 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1589 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1590 // For consistency return the real time from getTimeNanos()
1591 // converted to seconds.
1592 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1593
1594 return true;
1595 }
1596 }
1597
1598 bool os::supports_vtime() { return true; }
1599
1600 bool os::enable_vtime() {
1601 int fd = ::open("/proc/self/ctl", O_WRONLY);
1602 if (fd == -1)
1603 return false;
1604
1605 long cmd[] = { PCSET, PR_MSACCT };
1606 int res = ::write(fd, cmd, sizeof(long) * 2);
1607 ::close(fd);
1608 if (res != sizeof(long) * 2)
1609 return false;
1610
1611 return true;
1612 }
1613
1614 bool os::vtime_enabled() {
1615 int fd = ::open("/proc/self/status", O_RDONLY);
1616 if (fd == -1)
1617 return false;
1618
1619 pstatus_t status;
1620 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1621 ::close(fd);
1622 if (res != sizeof(pstatus_t))
1623 return false;
1624
1625 return status.pr_flags & PR_MSACCT;
1626 }
1627
1628 double os::elapsedVTime() {
1629 return (double)gethrvtime() / (double)hrtime_hz;
1630 }
1631
1632 // Used internally for comparisons only
1633 // getTimeMillis guaranteed to not move backwards on Solaris
1634 jlong getTimeMillis() {
1635 jlong nanotime = getTimeNanos();
1636 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1637 }
1638
1639 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1640 jlong os::javaTimeMillis() {
1641 timeval t;
1642 if (gettimeofday( &t, NULL) == -1)
1643 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1644 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1645 }
1646
1647 jlong os::javaTimeNanos() {
1648 return (jlong)getTimeNanos();
1649 }
1650
1651 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1652 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1653 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1654 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1655 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1656 }
1657
1658 char * os::local_time_string(char *buf, size_t buflen) {
1659 struct tm t;
1660 time_t long_time;
1661 time(&long_time);
1662 localtime_r(&long_time, &t);
1663 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1664 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1665 t.tm_hour, t.tm_min, t.tm_sec);
1666 return buf;
1667 }
1668
1669 // Note: os::shutdown() might be called very early during initialization, or
1670 // called from signal handler. Before adding something to os::shutdown(), make
1671 // sure it is async-safe and can handle partially initialized VM.
1672 void os::shutdown() {
1673
1674 // allow PerfMemory to attempt cleanup of any persistent resources
1675 perfMemory_exit();
1676
1677 // needs to remove object in file system
1678 AttachListener::abort();
1679
1680 // flush buffered output, finish log files
1681 ostream_abort();
1682
1683 // Check for abort hook
1684 abort_hook_t abort_hook = Arguments::abort_hook();
1685 if (abort_hook != NULL) {
1686 abort_hook();
1687 }
1688 }
1689
1690 // Note: os::abort() might be called very early during initialization, or
1691 // called from signal handler. Before adding something to os::abort(), make
1692 // sure it is async-safe and can handle partially initialized VM.
1693 void os::abort(bool dump_core) {
1694 os::shutdown();
1695 if (dump_core) {
1696 #ifndef PRODUCT
1697 fdStream out(defaultStream::output_fd());
1698 out.print_raw("Current thread is ");
1699 char buf[16];
1700 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1701 out.print_raw_cr(buf);
1702 out.print_raw_cr("Dumping core ...");
1703 #endif
1704 ::abort(); // dump core (for debugging)
1705 }
1706
1707 ::exit(1);
1708 }
1709
1710 // Die immediately, no exit hook, no abort hook, no cleanup.
1711 void os::die() {
1712 ::abort(); // dump core (for debugging)
1713 }
1714
1715 // DLL functions
1716
1717 const char* os::dll_file_extension() { return ".so"; }
1718
1719 // This must be hard coded because it's the system's temporary
1720 // directory not the java application's temp directory, ala java.io.tmpdir.
1721 const char* os::get_temp_directory() { return "/tmp"; }
1722
1723 static bool file_exists(const char* filename) {
1724 struct stat statbuf;
1725 if (filename == NULL || strlen(filename) == 0) {
1726 return false;
1727 }
1728 return os::stat(filename, &statbuf) == 0;
1729 }
1730
1731 bool os::dll_build_name(char* buffer, size_t buflen,
1732 const char* pname, const char* fname) {
1733 bool retval = false;
1734 const size_t pnamelen = pname ? strlen(pname) : 0;
1735
1736 // Return error on buffer overflow.
1737 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1738 return retval;
1739 }
1740
1741 if (pnamelen == 0) {
1742 snprintf(buffer, buflen, "lib%s.so", fname);
1743 retval = true;
1744 } else if (strchr(pname, *os::path_separator()) != NULL) {
1745 int n;
1746 char** pelements = split_path(pname, &n);
1747 if (pelements == NULL) {
1748 return false;
1749 }
1750 for (int i = 0 ; i < n ; i++) {
1751 // really shouldn't be NULL but what the heck, check can't hurt
1752 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1753 continue; // skip the empty path values
1754 }
1755 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1756 if (file_exists(buffer)) {
1757 retval = true;
1758 break;
1759 }
1760 }
1761 // release the storage
1762 for (int i = 0 ; i < n ; i++) {
1763 if (pelements[i] != NULL) {
1764 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1765 }
1766 }
1767 if (pelements != NULL) {
1768 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1769 }
1770 } else {
1771 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1772 retval = true;
1773 }
1774 return retval;
1775 }
1776
1777 // check if addr is inside libjvm.so
1778 bool os::address_is_in_vm(address addr) {
1779 static address libjvm_base_addr;
1780 Dl_info dlinfo;
1781
1782 if (libjvm_base_addr == NULL) {
1783 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1784 libjvm_base_addr = (address)dlinfo.dli_fbase;
1785 }
1786 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1787 }
1788
1789 if (dladdr((void *)addr, &dlinfo) != 0) {
1790 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1791 }
1792
1793 return false;
1794 }
1795
1796 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1797 static dladdr1_func_type dladdr1_func = NULL;
1798
1799 bool os::dll_address_to_function_name(address addr, char *buf,
1800 int buflen, int * offset) {
1801 // buf is not optional, but offset is optional
1802 assert(buf != NULL, "sanity check");
1803
1804 Dl_info dlinfo;
1805
1806 // dladdr1_func was initialized in os::init()
1807 if (dladdr1_func != NULL) {
1808 // yes, we have dladdr1
1809
1810 // Support for dladdr1 is checked at runtime; it may be
1811 // available even if the vm is built on a machine that does
1812 // not have dladdr1 support. Make sure there is a value for
1813 // RTLD_DL_SYMENT.
1814 #ifndef RTLD_DL_SYMENT
1815 #define RTLD_DL_SYMENT 1
1816 #endif
1817 #ifdef _LP64
1818 Elf64_Sym * info;
1819 #else
1820 Elf32_Sym * info;
1821 #endif
1822 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1823 RTLD_DL_SYMENT) != 0) {
1824 // see if we have a matching symbol that covers our address
1825 if (dlinfo.dli_saddr != NULL &&
1826 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1827 if (dlinfo.dli_sname != NULL) {
1828 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1829 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1830 }
1831 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1832 return true;
1833 }
1834 }
1835 // no matching symbol so try for just file info
1836 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1837 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1838 buf, buflen, offset, dlinfo.dli_fname)) {
1839 return true;
1840 }
1841 }
1842 }
1843 buf[0] = '\0';
1844 if (offset != NULL) *offset = -1;
1845 return false;
1846 }
1847
1848 // no, only dladdr is available
1849 if (dladdr((void *)addr, &dlinfo) != 0) {
1850 // see if we have a matching symbol
1851 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1852 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1853 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1854 }
1855 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1856 return true;
1857 }
1858 // no matching symbol so try for just file info
1859 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1860 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1861 buf, buflen, offset, dlinfo.dli_fname)) {
1862 return true;
1863 }
1864 }
1865 }
1866 buf[0] = '\0';
1867 if (offset != NULL) *offset = -1;
1868 return false;
1869 }
1870
1871 bool os::dll_address_to_library_name(address addr, char* buf,
1872 int buflen, int* offset) {
1873 // buf is not optional, but offset is optional
1874 assert(buf != NULL, "sanity check");
1875
1876 Dl_info dlinfo;
1877
1878 if (dladdr((void*)addr, &dlinfo) != 0) {
1879 if (dlinfo.dli_fname != NULL) {
1880 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1881 }
1882 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1883 *offset = addr - (address)dlinfo.dli_fbase;
1884 }
1885 return true;
1886 }
1887
1888 buf[0] = '\0';
1889 if (offset) *offset = -1;
1890 return false;
1891 }
1892
1893 // Prints the names and full paths of all opened dynamic libraries
1894 // for current process
1895 void os::print_dll_info(outputStream * st) {
1896 Dl_info dli;
1897 void *handle;
1898 Link_map *map;
1899 Link_map *p;
1900
1901 st->print_cr("Dynamic libraries:"); st->flush();
1902
1903 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1904 dli.dli_fname == NULL) {
1905 st->print_cr("Error: Cannot print dynamic libraries.");
1906 return;
1907 }
1908 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1909 if (handle == NULL) {
1910 st->print_cr("Error: Cannot print dynamic libraries.");
1911 return;
1912 }
1913 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1914 if (map == NULL) {
1915 st->print_cr("Error: Cannot print dynamic libraries.");
1916 return;
1917 }
1918
1919 while (map->l_prev != NULL)
1920 map = map->l_prev;
1921
1922 while (map != NULL) {
1923 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1924 map = map->l_next;
1925 }
1926
1927 dlclose(handle);
1928 }
1929
1930 // Loads .dll/.so and
1931 // in case of error it checks if .dll/.so was built for the
1932 // same architecture as Hotspot is running on
1933
1934 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1935 {
1936 void * result= ::dlopen(filename, RTLD_LAZY);
1937 if (result != NULL) {
1938 // Successful loading
1939 return result;
1940 }
1941
1942 Elf32_Ehdr elf_head;
1943
1944 // Read system error message into ebuf
1945 // It may or may not be overwritten below
1946 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1947 ebuf[ebuflen-1]='\0';
1948 int diag_msg_max_length=ebuflen-strlen(ebuf);
1949 char* diag_msg_buf=ebuf+strlen(ebuf);
1950
1951 if (diag_msg_max_length==0) {
1952 // No more space in ebuf for additional diagnostics message
1953 return NULL;
1954 }
1955
1956
1957 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1958
1959 if (file_descriptor < 0) {
1960 // Can't open library, report dlerror() message
1961 return NULL;
1962 }
1963
1964 bool failed_to_read_elf_head=
1965 (sizeof(elf_head)!=
1966 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1967
1968 ::close(file_descriptor);
1969 if (failed_to_read_elf_head) {
1970 // file i/o error - report dlerror() msg
1971 return NULL;
1972 }
1973
1974 typedef struct {
1975 Elf32_Half code; // Actual value as defined in elf.h
1976 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1977 char elf_class; // 32 or 64 bit
1978 char endianess; // MSB or LSB
1979 char* name; // String representation
1980 } arch_t;
1981
1982 static const arch_t arch_array[]={
1983 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1984 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1985 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1986 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1987 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1988 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1989 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1990 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1991 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1992 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1993 };
1994
1995 #if (defined IA32)
1996 static Elf32_Half running_arch_code=EM_386;
1997 #elif (defined AMD64)
1998 static Elf32_Half running_arch_code=EM_X86_64;
1999 #elif (defined IA64)
2000 static Elf32_Half running_arch_code=EM_IA_64;
2001 #elif (defined __sparc) && (defined _LP64)
2002 static Elf32_Half running_arch_code=EM_SPARCV9;
2003 #elif (defined __sparc) && (!defined _LP64)
2004 static Elf32_Half running_arch_code=EM_SPARC;
2005 #elif (defined __powerpc64__)
2006 static Elf32_Half running_arch_code=EM_PPC64;
2007 #elif (defined __powerpc__)
2008 static Elf32_Half running_arch_code=EM_PPC;
2009 #elif (defined ARM)
2010 static Elf32_Half running_arch_code=EM_ARM;
2011 #else
2012 #error Method os::dll_load requires that one of following is defined:\
2013 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2014 #endif
2015
2016 // Identify compatability class for VM's architecture and library's architecture
2017 // Obtain string descriptions for architectures
2018
2019 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2020 int running_arch_index=-1;
2021
2022 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2023 if (running_arch_code == arch_array[i].code) {
2024 running_arch_index = i;
2025 }
2026 if (lib_arch.code == arch_array[i].code) {
2027 lib_arch.compat_class = arch_array[i].compat_class;
2028 lib_arch.name = arch_array[i].name;
2029 }
2030 }
2031
2032 assert(running_arch_index != -1,
2033 "Didn't find running architecture code (running_arch_code) in arch_array");
2034 if (running_arch_index == -1) {
2035 // Even though running architecture detection failed
2036 // we may still continue with reporting dlerror() message
2037 return NULL;
2038 }
2039
2040 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2041 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2042 return NULL;
2043 }
2044
2045 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2046 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2047 return NULL;
2048 }
2049
2050 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2051 if ( lib_arch.name!=NULL ) {
2052 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2053 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2054 lib_arch.name, arch_array[running_arch_index].name);
2055 } else {
2056 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2057 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2058 lib_arch.code,
2059 arch_array[running_arch_index].name);
2060 }
2061 }
2062
2063 return NULL;
2064 }
2065
2066 void* os::dll_lookup(void* handle, const char* name) {
2067 return dlsym(handle, name);
2068 }
2069
2070 void* os::get_default_process_handle() {
2071 return (void*)::dlopen(NULL, RTLD_LAZY);
2072 }
2073
2074 int os::stat(const char *path, struct stat *sbuf) {
2075 char pathbuf[MAX_PATH];
2076 if (strlen(path) > MAX_PATH - 1) {
2077 errno = ENAMETOOLONG;
2078 return -1;
2079 }
2080 os::native_path(strcpy(pathbuf, path));
2081 return ::stat(pathbuf, sbuf);
2082 }
2083
2084 static bool _print_ascii_file(const char* filename, outputStream* st) {
2085 int fd = ::open(filename, O_RDONLY);
2086 if (fd == -1) {
2087 return false;
2088 }
2089
2090 char buf[32];
2091 int bytes;
2092 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2093 st->print_raw(buf, bytes);
2094 }
2095
2096 ::close(fd);
2097
2098 return true;
2099 }
2100
2101 void os::print_os_info_brief(outputStream* st) {
2102 os::Solaris::print_distro_info(st);
2103
2104 os::Posix::print_uname_info(st);
2105
2106 os::Solaris::print_libversion_info(st);
2107 }
2108
2109 void os::print_os_info(outputStream* st) {
2110 st->print("OS:");
2111
2112 os::Solaris::print_distro_info(st);
2113
2114 os::Posix::print_uname_info(st);
2115
2116 os::Solaris::print_libversion_info(st);
2117
2118 os::Posix::print_rlimit_info(st);
2119
2120 os::Posix::print_load_average(st);
2121 }
2122
2123 void os::Solaris::print_distro_info(outputStream* st) {
2124 if (!_print_ascii_file("/etc/release", st)) {
2125 st->print("Solaris");
2126 }
2127 st->cr();
2128 }
2129
2130 void os::Solaris::print_libversion_info(outputStream* st) {
2131 if (os::Solaris::T2_libthread()) {
2132 st->print(" (T2 libthread)");
2133 }
2134 else {
2135 st->print(" (T1 libthread)");
2136 }
2137 st->cr();
2138 }
2139
2140 static bool check_addr0(outputStream* st) {
2141 jboolean status = false;
2142 int fd = ::open("/proc/self/map",O_RDONLY);
2143 if (fd >= 0) {
2144 prmap_t p;
2145 while(::read(fd, &p, sizeof(p)) > 0) {
2146 if (p.pr_vaddr == 0x0) {
2147 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2148 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2149 st->print("Access:");
2150 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2151 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2152 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2153 st->cr();
2154 status = true;
2155 }
2156 }
2157 ::close(fd);
2158 }
2159 return status;
2160 }
2161
2162 void os::pd_print_cpu_info(outputStream* st) {
2163 // Nothing to do for now.
2164 }
2165
2166 void os::print_memory_info(outputStream* st) {
2167 st->print("Memory:");
2168 st->print(" %dk page", os::vm_page_size()>>10);
2169 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2170 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2171 st->cr();
2172 (void) check_addr0(st);
2173 }
2174
2175 void os::print_siginfo(outputStream* st, void* siginfo) {
2176 const siginfo_t* si = (const siginfo_t*)siginfo;
2177
2178 os::Posix::print_siginfo_brief(st, si);
2179
2180 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2181 UseSharedSpaces) {
2182 FileMapInfo* mapinfo = FileMapInfo::current_info();
2183 if (mapinfo->is_in_shared_space(si->si_addr)) {
2184 st->print("\n\nError accessing class data sharing archive." \
2185 " Mapped file inaccessible during execution, " \
2186 " possible disk/network problem.");
2187 }
2188 }
2189 st->cr();
2190 }
2191
2192 // Moved from whole group, because we need them here for diagnostic
2193 // prints.
2194 #define OLDMAXSIGNUM 32
2195 static int Maxsignum = 0;
2196 static int *ourSigFlags = NULL;
2197
2198 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2199
2200 int os::Solaris::get_our_sigflags(int sig) {
2201 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2202 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2203 return ourSigFlags[sig];
2204 }
2205
2206 void os::Solaris::set_our_sigflags(int sig, int flags) {
2207 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2208 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2209 ourSigFlags[sig] = flags;
2210 }
2211
2212
2213 static const char* get_signal_handler_name(address handler,
2214 char* buf, int buflen) {
2215 int offset;
2216 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2217 if (found) {
2218 // skip directory names
2219 const char *p1, *p2;
2220 p1 = buf;
2221 size_t len = strlen(os::file_separator());
2222 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2223 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2224 } else {
2225 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2226 }
2227 return buf;
2228 }
2229
2230 static void print_signal_handler(outputStream* st, int sig,
2231 char* buf, size_t buflen) {
2232 struct sigaction sa;
2233
2234 sigaction(sig, NULL, &sa);
2235
2236 st->print("%s: ", os::exception_name(sig, buf, buflen));
2237
2238 address handler = (sa.sa_flags & SA_SIGINFO)
2239 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2240 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2241
2242 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2243 st->print("SIG_DFL");
2244 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2245 st->print("SIG_IGN");
2246 } else {
2247 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2248 }
2249
2250 st->print(", sa_mask[0]=");
2251 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2252
2253 address rh = VMError::get_resetted_sighandler(sig);
2254 // May be, handler was resetted by VMError?
2255 if(rh != NULL) {
2256 handler = rh;
2257 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2258 }
2259
2260 st->print(", sa_flags=");
2261 os::Posix::print_sa_flags(st, sa.sa_flags);
2262
2263 // Check: is it our handler?
2264 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2265 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2266 // It is our signal handler
2267 // check for flags
2268 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2269 st->print(
2270 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2271 os::Solaris::get_our_sigflags(sig));
2272 }
2273 }
2274 st->cr();
2275 }
2276
2277 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2278 st->print_cr("Signal Handlers:");
2279 print_signal_handler(st, SIGSEGV, buf, buflen);
2280 print_signal_handler(st, SIGBUS , buf, buflen);
2281 print_signal_handler(st, SIGFPE , buf, buflen);
2282 print_signal_handler(st, SIGPIPE, buf, buflen);
2283 print_signal_handler(st, SIGXFSZ, buf, buflen);
2284 print_signal_handler(st, SIGILL , buf, buflen);
2285 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2286 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2287 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2288 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2289 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2290 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2291 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2292 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2293 }
2294
2295 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2296
2297 // Find the full path to the current module, libjvm.so
2298 void os::jvm_path(char *buf, jint buflen) {
2299 // Error checking.
2300 if (buflen < MAXPATHLEN) {
2301 assert(false, "must use a large-enough buffer");
2302 buf[0] = '\0';
2303 return;
2304 }
2305 // Lazy resolve the path to current module.
2306 if (saved_jvm_path[0] != 0) {
2307 strcpy(buf, saved_jvm_path);
2308 return;
2309 }
2310
2311 Dl_info dlinfo;
2312 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2313 assert(ret != 0, "cannot locate libjvm");
2314 if (ret != 0 && dlinfo.dli_fname != NULL) {
2315 realpath((char *)dlinfo.dli_fname, buf);
2316 } else {
2317 buf[0] = '\0';
2318 return;
2319 }
2320
2321 if (Arguments::created_by_gamma_launcher()) {
2322 // Support for the gamma launcher. Typical value for buf is
2323 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2324 // the right place in the string, then assume we are installed in a JDK and
2325 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2326 // up the path so it looks like libjvm.so is installed there (append a
2327 // fake suffix hotspot/libjvm.so).
2328 const char *p = buf + strlen(buf) - 1;
2329 for (int count = 0; p > buf && count < 5; ++count) {
2330 for (--p; p > buf && *p != '/'; --p)
2331 /* empty */ ;
2332 }
2333
2334 if (strncmp(p, "/jre/lib/", 9) != 0) {
2335 // Look for JAVA_HOME in the environment.
2336 char* java_home_var = ::getenv("JAVA_HOME");
2337 if (java_home_var != NULL && java_home_var[0] != 0) {
2338 char cpu_arch[12];
2339 char* jrelib_p;
2340 int len;
2341 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2342 #ifdef _LP64
2343 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2344 if (strcmp(cpu_arch, "sparc") == 0) {
2345 strcat(cpu_arch, "v9");
2346 } else if (strcmp(cpu_arch, "i386") == 0) {
2347 strcpy(cpu_arch, "amd64");
2348 }
2349 #endif
2350 // Check the current module name "libjvm.so".
2351 p = strrchr(buf, '/');
2352 assert(strstr(p, "/libjvm") == p, "invalid library name");
2353
2354 realpath(java_home_var, buf);
2355 // determine if this is a legacy image or modules image
2356 // modules image doesn't have "jre" subdirectory
2357 len = strlen(buf);
2358 assert(len < buflen, "Ran out of buffer space");
2359 jrelib_p = buf + len;
2360 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2361 if (0 != access(buf, F_OK)) {
2362 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2363 }
2364
2365 if (0 == access(buf, F_OK)) {
2366 // Use current module name "libjvm.so"
2367 len = strlen(buf);
2368 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2369 } else {
2370 // Go back to path of .so
2371 realpath((char *)dlinfo.dli_fname, buf);
2372 }
2373 }
2374 }
2375 }
2376
2377 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2378 }
2379
2380
2381 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2382 // no prefix required, not even "_"
2383 }
2384
2385
2386 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2387 // no suffix required
2388 }
2389
2390 // This method is a copy of JDK's sysGetLastErrorString
2391 // from src/solaris/hpi/src/system_md.c
2392
2393 size_t os::lasterror(char *buf, size_t len) {
2394
2395 if (errno == 0) return 0;
2396
2397 const char *s = ::strerror(errno);
2398 size_t n = ::strlen(s);
2399 if (n >= len) {
2400 n = len - 1;
2401 }
2402 ::strncpy(buf, s, n);
2403 buf[n] = '\0';
2404 return n;
2405 }
2406
2407
2408 // sun.misc.Signal
2409
2410 extern "C" {
2411 static void UserHandler(int sig, void *siginfo, void *context) {
2412 // Ctrl-C is pressed during error reporting, likely because the error
2413 // handler fails to abort. Let VM die immediately.
2414 if (sig == SIGINT && is_error_reported()) {
2415 os::die();
2416 }
2417
2418 os::signal_notify(sig);
2419 // We do not need to reinstate the signal handler each time...
2420 }
2421 }
2422
2423 void* os::user_handler() {
2424 return CAST_FROM_FN_PTR(void*, UserHandler);
2425 }
2426
2427 class Semaphore : public StackObj {
2428 public:
2429 Semaphore();
2430 ~Semaphore();
2431 void signal();
2432 void wait();
2433 bool trywait();
2434 bool timedwait(unsigned int sec, int nsec);
2435 private:
2436 sema_t _semaphore;
2437 };
2438
2439
2440 Semaphore::Semaphore() {
2441 sema_init(&_semaphore, 0, NULL, NULL);
2442 }
2443
2444 Semaphore::~Semaphore() {
2445 sema_destroy(&_semaphore);
2446 }
2447
2448 void Semaphore::signal() {
2449 sema_post(&_semaphore);
2450 }
2451
2452 void Semaphore::wait() {
2453 sema_wait(&_semaphore);
2454 }
2455
2456 bool Semaphore::trywait() {
2457 return sema_trywait(&_semaphore) == 0;
2458 }
2459
2460 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2461 struct timespec ts;
2462 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2463
2464 while (1) {
2465 int result = sema_timedwait(&_semaphore, &ts);
2466 if (result == 0) {
2467 return true;
2468 } else if (errno == EINTR) {
2469 continue;
2470 } else if (errno == ETIME) {
2471 return false;
2472 } else {
2473 return false;
2474 }
2475 }
2476 }
2477
2478 extern "C" {
2479 typedef void (*sa_handler_t)(int);
2480 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2481 }
2482
2483 void* os::signal(int signal_number, void* handler) {
2484 struct sigaction sigAct, oldSigAct;
2485 sigfillset(&(sigAct.sa_mask));
2486 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2487 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2488
2489 if (sigaction(signal_number, &sigAct, &oldSigAct))
2490 // -1 means registration failed
2491 return (void *)-1;
2492
2493 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2494 }
2495
2496 void os::signal_raise(int signal_number) {
2497 raise(signal_number);
2498 }
2499
2500 /*
2501 * The following code is moved from os.cpp for making this
2502 * code platform specific, which it is by its very nature.
2503 */
2504
2505 // a counter for each possible signal value
2506 static int Sigexit = 0;
2507 static int Maxlibjsigsigs;
2508 static jint *pending_signals = NULL;
2509 static int *preinstalled_sigs = NULL;
2510 static struct sigaction *chainedsigactions = NULL;
2511 static sema_t sig_sem;
2512 typedef int (*version_getting_t)();
2513 version_getting_t os::Solaris::get_libjsig_version = NULL;
2514 static int libjsigversion = NULL;
2515
2516 int os::sigexitnum_pd() {
2517 assert(Sigexit > 0, "signal memory not yet initialized");
2518 return Sigexit;
2519 }
2520
2521 void os::Solaris::init_signal_mem() {
2522 // Initialize signal structures
2523 Maxsignum = SIGRTMAX;
2524 Sigexit = Maxsignum+1;
2525 assert(Maxsignum >0, "Unable to obtain max signal number");
2526
2527 Maxlibjsigsigs = Maxsignum;
2528
2529 // pending_signals has one int per signal
2530 // The additional signal is for SIGEXIT - exit signal to signal_thread
2531 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2532 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2533
2534 if (UseSignalChaining) {
2535 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2536 * (Maxsignum + 1), mtInternal);
2537 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2538 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2539 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2540 }
2541 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2542 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2543 }
2544
2545 void os::signal_init_pd() {
2546 int ret;
2547
2548 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2549 assert(ret == 0, "sema_init() failed");
2550 }
2551
2552 void os::signal_notify(int signal_number) {
2553 int ret;
2554
2555 Atomic::inc(&pending_signals[signal_number]);
2556 ret = ::sema_post(&sig_sem);
2557 assert(ret == 0, "sema_post() failed");
2558 }
2559
2560 static int check_pending_signals(bool wait_for_signal) {
2561 int ret;
2562 while (true) {
2563 for (int i = 0; i < Sigexit + 1; i++) {
2564 jint n = pending_signals[i];
2565 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2566 return i;
2567 }
2568 }
2569 if (!wait_for_signal) {
2570 return -1;
2571 }
2572 JavaThread *thread = JavaThread::current();
2573 ThreadBlockInVM tbivm(thread);
2574
2575 bool threadIsSuspended;
2576 do {
2577 thread->set_suspend_equivalent();
2578 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2579 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2580 ;
2581 assert(ret == 0, "sema_wait() failed");
2582
2583 // were we externally suspended while we were waiting?
2584 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2585 if (threadIsSuspended) {
2586 //
2587 // The semaphore has been incremented, but while we were waiting
2588 // another thread suspended us. We don't want to continue running
2589 // while suspended because that would surprise the thread that
2590 // suspended us.
2591 //
2592 ret = ::sema_post(&sig_sem);
2593 assert(ret == 0, "sema_post() failed");
2594
2595 thread->java_suspend_self();
2596 }
2597 } while (threadIsSuspended);
2598 }
2599 }
2600
2601 int os::signal_lookup() {
2602 return check_pending_signals(false);
2603 }
2604
2605 int os::signal_wait() {
2606 return check_pending_signals(true);
2607 }
2608
2609 ////////////////////////////////////////////////////////////////////////////////
2610 // Virtual Memory
2611
2612 static int page_size = -1;
2613
2614 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2615 // clear this var if support is not available.
2616 static bool has_map_align = true;
2617
2618 int os::vm_page_size() {
2619 assert(page_size != -1, "must call os::init");
2620 return page_size;
2621 }
2622
2623 // Solaris allocates memory by pages.
2624 int os::vm_allocation_granularity() {
2625 assert(page_size != -1, "must call os::init");
2626 return page_size;
2627 }
2628
2629 static bool recoverable_mmap_error(int err) {
2630 // See if the error is one we can let the caller handle. This
2631 // list of errno values comes from the Solaris mmap(2) man page.
2632 switch (err) {
2633 case EBADF:
2634 case EINVAL:
2635 case ENOTSUP:
2636 // let the caller deal with these errors
2637 return true;
2638
2639 default:
2640 // Any remaining errors on this OS can cause our reserved mapping
2641 // to be lost. That can cause confusion where different data
2642 // structures think they have the same memory mapped. The worst
2643 // scenario is if both the VM and a library think they have the
2644 // same memory mapped.
2645 return false;
2646 }
2647 }
2648
2649 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2650 int err) {
2651 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2652 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2653 strerror(err), err);
2654 }
2655
2656 static void warn_fail_commit_memory(char* addr, size_t bytes,
2657 size_t alignment_hint, bool exec,
2658 int err) {
2659 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2660 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2661 alignment_hint, exec, strerror(err), err);
2662 }
2663
2664 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2665 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2666 size_t size = bytes;
2667 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2668 if (res != NULL) {
2669 if (UseNUMAInterleaving) {
2670 numa_make_global(addr, bytes);
2671 }
2672 return 0;
2673 }
2674
2675 int err = errno; // save errno from mmap() call in mmap_chunk()
2676
2677 if (!recoverable_mmap_error(err)) {
2678 warn_fail_commit_memory(addr, bytes, exec, err);
2679 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2680 }
2681
2682 return err;
2683 }
2684
2685 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2686 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2687 }
2688
2689 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2690 const char* mesg) {
2691 assert(mesg != NULL, "mesg must be specified");
2692 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2693 if (err != 0) {
2694 // the caller wants all commit errors to exit with the specified mesg:
2695 warn_fail_commit_memory(addr, bytes, exec, err);
2696 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2697 }
2698 }
2699
2700 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2701 size_t alignment_hint, bool exec) {
2702 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2703 if (err == 0) {
2704 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) {
2705 // If the large page size has been set and the VM
2706 // is using large pages, use the large page size
2707 // if it is smaller than the alignment hint. This is
2708 // a case where the VM wants to use a larger alignment size
2709 // for its own reasons but still want to use large pages
2710 // (which is what matters to setting the mpss range.
2711 size_t page_size = 0;
2712 if (large_page_size() < alignment_hint) {
2713 assert(UseLargePages, "Expected to be here for large page use only");
2714 page_size = large_page_size();
2715 } else {
2716 // If the alignment hint is less than the large page
2717 // size, the VM wants a particular alignment (thus the hint)
2718 // for internal reasons. Try to set the mpss range using
2719 // the alignment_hint.
2720 page_size = alignment_hint;
2721 }
2722 // Since this is a hint, ignore any failures.
2723 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2724 }
2725 }
2726 return err;
2727 }
2728
2729 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2730 bool exec) {
2731 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2732 }
2733
2734 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2735 size_t alignment_hint, bool exec,
2736 const char* mesg) {
2737 assert(mesg != NULL, "mesg must be specified");
2738 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2739 if (err != 0) {
2740 // the caller wants all commit errors to exit with the specified mesg:
2741 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2742 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2743 }
2744 }
2745
2746 // Uncommit the pages in a specified region.
2747 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2748 if (madvise(addr, bytes, MADV_FREE) < 0) {
2749 debug_only(warning("MADV_FREE failed."));
2750 return;
2751 }
2752 }
2753
2754 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2755 return os::commit_memory(addr, size, !ExecMem);
2756 }
2757
2758 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2759 return os::uncommit_memory(addr, size);
2760 }
2761
2762 // Change the page size in a given range.
2763 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2764 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2765 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2766 if (UseLargePages) {
2767 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2768 }
2769 }
2770
2771 // Tell the OS to make the range local to the first-touching LWP
2772 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2773 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2774 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2775 debug_only(warning("MADV_ACCESS_LWP failed."));
2776 }
2777 }
2778
2779 // Tell the OS that this range would be accessed from different LWPs.
2780 void os::numa_make_global(char *addr, size_t bytes) {
2781 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2782 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2783 debug_only(warning("MADV_ACCESS_MANY failed."));
2784 }
2785 }
2786
2787 // Get the number of the locality groups.
2788 size_t os::numa_get_groups_num() {
2789 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2790 return n != -1 ? n : 1;
2791 }
2792
2793 // Get a list of leaf locality groups. A leaf lgroup is group that
2794 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2795 // board. An LWP is assigned to one of these groups upon creation.
2796 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2797 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2798 ids[0] = 0;
2799 return 1;
2800 }
2801 int result_size = 0, top = 1, bottom = 0, cur = 0;
2802 for (int k = 0; k < size; k++) {
2803 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2804 (Solaris::lgrp_id_t*)&ids[top], size - top);
2805 if (r == -1) {
2806 ids[0] = 0;
2807 return 1;
2808 }
2809 if (!r) {
2810 // That's a leaf node.
2811 assert (bottom <= cur, "Sanity check");
2812 // Check if the node has memory
2813 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2814 NULL, 0, LGRP_RSRC_MEM) > 0) {
2815 ids[bottom++] = ids[cur];
2816 }
2817 }
2818 top += r;
2819 cur++;
2820 }
2821 if (bottom == 0) {
2822 // Handle a situation, when the OS reports no memory available.
2823 // Assume UMA architecture.
2824 ids[0] = 0;
2825 return 1;
2826 }
2827 return bottom;
2828 }
2829
2830 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2831 bool os::numa_topology_changed() {
2832 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2833 if (is_stale != -1 && is_stale) {
2834 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2835 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2836 assert(c != 0, "Failure to initialize LGRP API");
2837 Solaris::set_lgrp_cookie(c);
2838 return true;
2839 }
2840 return false;
2841 }
2842
2843 // Get the group id of the current LWP.
2844 int os::numa_get_group_id() {
2845 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2846 if (lgrp_id == -1) {
2847 return 0;
2848 }
2849 const int size = os::numa_get_groups_num();
2850 int *ids = (int*)alloca(size * sizeof(int));
2851
2852 // Get the ids of all lgroups with memory; r is the count.
2853 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2854 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2855 if (r <= 0) {
2856 return 0;
2857 }
2858 return ids[os::random() % r];
2859 }
2860
2861 // Request information about the page.
2862 bool os::get_page_info(char *start, page_info* info) {
2863 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2864 uint64_t addr = (uintptr_t)start;
2865 uint64_t outdata[2];
2866 uint_t validity = 0;
2867
2868 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2869 return false;
2870 }
2871
2872 info->size = 0;
2873 info->lgrp_id = -1;
2874
2875 if ((validity & 1) != 0) {
2876 if ((validity & 2) != 0) {
2877 info->lgrp_id = outdata[0];
2878 }
2879 if ((validity & 4) != 0) {
2880 info->size = outdata[1];
2881 }
2882 return true;
2883 }
2884 return false;
2885 }
2886
2887 // Scan the pages from start to end until a page different than
2888 // the one described in the info parameter is encountered.
2889 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2890 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2891 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2892 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2893 uint_t validity[MAX_MEMINFO_CNT];
2894
2895 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2896 uint64_t p = (uint64_t)start;
2897 while (p < (uint64_t)end) {
2898 addrs[0] = p;
2899 size_t addrs_count = 1;
2900 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2901 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2902 addrs_count++;
2903 }
2904
2905 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2906 return NULL;
2907 }
2908
2909 size_t i = 0;
2910 for (; i < addrs_count; i++) {
2911 if ((validity[i] & 1) != 0) {
2912 if ((validity[i] & 4) != 0) {
2913 if (outdata[types * i + 1] != page_expected->size) {
2914 break;
2915 }
2916 } else
2917 if (page_expected->size != 0) {
2918 break;
2919 }
2920
2921 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2922 if (outdata[types * i] != page_expected->lgrp_id) {
2923 break;
2924 }
2925 }
2926 } else {
2927 return NULL;
2928 }
2929 }
2930
2931 if (i < addrs_count) {
2932 if ((validity[i] & 2) != 0) {
2933 page_found->lgrp_id = outdata[types * i];
2934 } else {
2935 page_found->lgrp_id = -1;
2936 }
2937 if ((validity[i] & 4) != 0) {
2938 page_found->size = outdata[types * i + 1];
2939 } else {
2940 page_found->size = 0;
2941 }
2942 return (char*)addrs[i];
2943 }
2944
2945 p = addrs[addrs_count - 1] + page_size;
2946 }
2947 return end;
2948 }
2949
2950 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2951 size_t size = bytes;
2952 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2953 // uncommitted page. Otherwise, the read/write might succeed if we
2954 // have enough swap space to back the physical page.
2955 return
2956 NULL != Solaris::mmap_chunk(addr, size,
2957 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2958 PROT_NONE);
2959 }
2960
2961 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2962 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2963
2964 if (b == MAP_FAILED) {
2965 return NULL;
2966 }
2967 return b;
2968 }
2969
2970 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2971 char* addr = requested_addr;
2972 int flags = MAP_PRIVATE | MAP_NORESERVE;
2973
2974 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2975
2976 if (fixed) {
2977 flags |= MAP_FIXED;
2978 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2979 flags |= MAP_ALIGN;
2980 addr = (char*) alignment_hint;
2981 }
2982
2983 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2984 // uncommitted page. Otherwise, the read/write might succeed if we
2985 // have enough swap space to back the physical page.
2986 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2987 }
2988
2989 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2990 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2991
2992 guarantee(requested_addr == NULL || requested_addr == addr,
2993 "OS failed to return requested mmap address.");
2994 return addr;
2995 }
2996
2997 // Reserve memory at an arbitrary address, only if that area is
2998 // available (and not reserved for something else).
2999
3000 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3001 const int max_tries = 10;
3002 char* base[max_tries];
3003 size_t size[max_tries];
3004
3005 // Solaris adds a gap between mmap'ed regions. The size of the gap
3006 // is dependent on the requested size and the MMU. Our initial gap
3007 // value here is just a guess and will be corrected later.
3008 bool had_top_overlap = false;
3009 bool have_adjusted_gap = false;
3010 size_t gap = 0x400000;
3011
3012 // Assert only that the size is a multiple of the page size, since
3013 // that's all that mmap requires, and since that's all we really know
3014 // about at this low abstraction level. If we need higher alignment,
3015 // we can either pass an alignment to this method or verify alignment
3016 // in one of the methods further up the call chain. See bug 5044738.
3017 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3018
3019 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3020 // Give it a try, if the kernel honors the hint we can return immediately.
3021 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3022
3023 volatile int err = errno;
3024 if (addr == requested_addr) {
3025 return addr;
3026 } else if (addr != NULL) {
3027 pd_unmap_memory(addr, bytes);
3028 }
3029
3030 if (PrintMiscellaneous && Verbose) {
3031 char buf[256];
3032 buf[0] = '\0';
3033 if (addr == NULL) {
3034 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3035 }
3036 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3037 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3038 "%s", bytes, requested_addr, addr, buf);
3039 }
3040
3041 // Address hint method didn't work. Fall back to the old method.
3042 // In theory, once SNV becomes our oldest supported platform, this
3043 // code will no longer be needed.
3044 //
3045 // Repeatedly allocate blocks until the block is allocated at the
3046 // right spot. Give up after max_tries.
3047 int i;
3048 for (i = 0; i < max_tries; ++i) {
3049 base[i] = reserve_memory(bytes);
3050
3051 if (base[i] != NULL) {
3052 // Is this the block we wanted?
3053 if (base[i] == requested_addr) {
3054 size[i] = bytes;
3055 break;
3056 }
3057
3058 // check that the gap value is right
3059 if (had_top_overlap && !have_adjusted_gap) {
3060 size_t actual_gap = base[i-1] - base[i] - bytes;
3061 if (gap != actual_gap) {
3062 // adjust the gap value and retry the last 2 allocations
3063 assert(i > 0, "gap adjustment code problem");
3064 have_adjusted_gap = true; // adjust the gap only once, just in case
3065 gap = actual_gap;
3066 if (PrintMiscellaneous && Verbose) {
3067 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3068 }
3069 unmap_memory(base[i], bytes);
3070 unmap_memory(base[i-1], size[i-1]);
3071 i-=2;
3072 continue;
3073 }
3074 }
3075
3076 // Does this overlap the block we wanted? Give back the overlapped
3077 // parts and try again.
3078 //
3079 // There is still a bug in this code: if top_overlap == bytes,
3080 // the overlap is offset from requested region by the value of gap.
3081 // In this case giving back the overlapped part will not work,
3082 // because we'll give back the entire block at base[i] and
3083 // therefore the subsequent allocation will not generate a new gap.
3084 // This could be fixed with a new algorithm that used larger
3085 // or variable size chunks to find the requested region -
3086 // but such a change would introduce additional complications.
3087 // It's rare enough that the planets align for this bug,
3088 // so we'll just wait for a fix for 6204603/5003415 which
3089 // will provide a mmap flag to allow us to avoid this business.
3090
3091 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3092 if (top_overlap >= 0 && top_overlap < bytes) {
3093 had_top_overlap = true;
3094 unmap_memory(base[i], top_overlap);
3095 base[i] += top_overlap;
3096 size[i] = bytes - top_overlap;
3097 } else {
3098 size_t bottom_overlap = base[i] + bytes - requested_addr;
3099 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3100 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3101 warning("attempt_reserve_memory_at: possible alignment bug");
3102 }
3103 unmap_memory(requested_addr, bottom_overlap);
3104 size[i] = bytes - bottom_overlap;
3105 } else {
3106 size[i] = bytes;
3107 }
3108 }
3109 }
3110 }
3111
3112 // Give back the unused reserved pieces.
3113
3114 for (int j = 0; j < i; ++j) {
3115 if (base[j] != NULL) {
3116 unmap_memory(base[j], size[j]);
3117 }
3118 }
3119
3120 return (i < max_tries) ? requested_addr : NULL;
3121 }
3122
3123 bool os::pd_release_memory(char* addr, size_t bytes) {
3124 size_t size = bytes;
3125 return munmap(addr, size) == 0;
3126 }
3127
3128 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3129 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3130 "addr must be page aligned");
3131 int retVal = mprotect(addr, bytes, prot);
3132 return retVal == 0;
3133 }
3134
3135 // Protect memory (Used to pass readonly pages through
3136 // JNI GetArray<type>Elements with empty arrays.)
3137 // Also, used for serialization page and for compressed oops null pointer
3138 // checking.
3139 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3140 bool is_committed) {
3141 unsigned int p = 0;
3142 switch (prot) {
3143 case MEM_PROT_NONE: p = PROT_NONE; break;
3144 case MEM_PROT_READ: p = PROT_READ; break;
3145 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3146 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3147 default:
3148 ShouldNotReachHere();
3149 }
3150 // is_committed is unused.
3151 return solaris_mprotect(addr, bytes, p);
3152 }
3153
3154 // guard_memory and unguard_memory only happens within stack guard pages.
3155 // Since ISM pertains only to the heap, guard and unguard memory should not
3156 /// happen with an ISM region.
3157 bool os::guard_memory(char* addr, size_t bytes) {
3158 return solaris_mprotect(addr, bytes, PROT_NONE);
3159 }
3160
3161 bool os::unguard_memory(char* addr, size_t bytes) {
3162 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3163 }
3164
3165 // Large page support
3166 static size_t _large_page_size = 0;
3167
3168 // Insertion sort for small arrays (descending order).
3169 static void insertion_sort_descending(size_t* array, int len) {
3170 for (int i = 0; i < len; i++) {
3171 size_t val = array[i];
3172 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3173 size_t tmp = array[key];
3174 array[key] = array[key - 1];
3175 array[key - 1] = tmp;
3176 }
3177 }
3178 }
3179
3180 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3181 const unsigned int usable_count = VM_Version::page_size_count();
3182 if (usable_count == 1) {
3183 return false;
3184 }
3185
3186 // Find the right getpagesizes interface. When solaris 11 is the minimum
3187 // build platform, getpagesizes() (without the '2') can be called directly.
3188 typedef int (*gps_t)(size_t[], int);
3189 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3190 if (gps_func == NULL) {
3191 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3192 if (gps_func == NULL) {
3193 if (warn) {
3194 warning("MPSS is not supported by the operating system.");
3195 }
3196 return false;
3197 }
3198 }
3199
3200 // Fill the array of page sizes.
3201 int n = (*gps_func)(_page_sizes, page_sizes_max);
3202 assert(n > 0, "Solaris bug?");
3203
3204 if (n == page_sizes_max) {
3205 // Add a sentinel value (necessary only if the array was completely filled
3206 // since it is static (zeroed at initialization)).
3207 _page_sizes[--n] = 0;
3208 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3209 }
3210 assert(_page_sizes[n] == 0, "missing sentinel");
3211 trace_page_sizes("available page sizes", _page_sizes, n);
3212
3213 if (n == 1) return false; // Only one page size available.
3214
3215 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3216 // select up to usable_count elements. First sort the array, find the first
3217 // acceptable value, then copy the usable sizes to the top of the array and
3218 // trim the rest. Make sure to include the default page size :-).
3219 //
3220 // A better policy could get rid of the 4M limit by taking the sizes of the
3221 // important VM memory regions (java heap and possibly the code cache) into
3222 // account.
3223 insertion_sort_descending(_page_sizes, n);
3224 const size_t size_limit =
3225 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3226 int beg;
3227 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3228 const int end = MIN2((int)usable_count, n) - 1;
3229 for (int cur = 0; cur < end; ++cur, ++beg) {
3230 _page_sizes[cur] = _page_sizes[beg];
3231 }
3232 _page_sizes[end] = vm_page_size();
3233 _page_sizes[end + 1] = 0;
3234
3235 if (_page_sizes[end] > _page_sizes[end - 1]) {
3236 // Default page size is not the smallest; sort again.
3237 insertion_sort_descending(_page_sizes, end + 1);
3238 }
3239 *page_size = _page_sizes[0];
3240
3241 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3242 return true;
3243 }
3244
3245 void os::large_page_init() {
3246 if (UseLargePages) {
3247 // print a warning if any large page related flag is specified on command line
3248 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3249 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3250
3251 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3252 }
3253 }
3254
3255 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3256 // Signal to OS that we want large pages for addresses
3257 // from addr, addr + bytes
3258 struct memcntl_mha mpss_struct;
3259 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3260 mpss_struct.mha_pagesize = align;
3261 mpss_struct.mha_flags = 0;
3262 // Upon successful completion, memcntl() returns 0
3263 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3264 debug_only(warning("Attempt to use MPSS failed."));
3265 return false;
3266 }
3267 return true;
3268 }
3269
3270 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3271 fatal("os::reserve_memory_special should not be called on Solaris.");
3272 return NULL;
3273 }
3274
3275 bool os::release_memory_special(char* base, size_t bytes) {
3276 fatal("os::release_memory_special should not be called on Solaris.");
3277 return false;
3278 }
3279
3280 size_t os::large_page_size() {
3281 return _large_page_size;
3282 }
3283
3284 // MPSS allows application to commit large page memory on demand; with ISM
3285 // the entire memory region must be allocated as shared memory.
3286 bool os::can_commit_large_page_memory() {
3287 return true;
3288 }
3289
3290 bool os::can_execute_large_page_memory() {
3291 return true;
3292 }
3293
3294 static int os_sleep(jlong millis, bool interruptible) {
3295 const jlong limit = INT_MAX;
3296 jlong prevtime;
3297 int res;
3298
3299 while (millis > limit) {
3300 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3301 return res;
3302 millis -= limit;
3303 }
3304
3305 // Restart interrupted polls with new parameters until the proper delay
3306 // has been completed.
3307
3308 prevtime = getTimeMillis();
3309
3310 while (millis > 0) {
3311 jlong newtime;
3312
3313 if (!interruptible) {
3314 // Following assert fails for os::yield_all:
3315 // assert(!thread->is_Java_thread(), "must not be java thread");
3316 res = poll(NULL, 0, millis);
3317 } else {
3318 JavaThread *jt = JavaThread::current();
3319
3320 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3321 os::Solaris::clear_interrupted);
3322 }
3323
3324 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3325 // thread.Interrupt.
3326
3327 // See c/r 6751923. Poll can return 0 before time
3328 // has elapsed if time is set via clock_settime (as NTP does).
3329 // res == 0 if poll timed out (see man poll RETURN VALUES)
3330 // using the logic below checks that we really did
3331 // sleep at least "millis" if not we'll sleep again.
3332 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3333 newtime = getTimeMillis();
3334 assert(newtime >= prevtime, "time moving backwards");
3335 /* Doing prevtime and newtime in microseconds doesn't help precision,
3336 and trying to round up to avoid lost milliseconds can result in a
3337 too-short delay. */
3338 millis -= newtime - prevtime;
3339 if(millis <= 0)
3340 return OS_OK;
3341 prevtime = newtime;
3342 } else
3343 return res;
3344 }
3345
3346 return OS_OK;
3347 }
3348
3349 // Read calls from inside the vm need to perform state transitions
3350 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3351 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3352 }
3353
3354 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3355 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3356 }
3357
3358 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3359 assert(thread == Thread::current(), "thread consistency check");
3360
3361 // TODO-FIXME: this should be removed.
3362 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3363 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3364 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3365 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3366 // is fooled into believing that the system is making progress. In the code below we block the
3367 // the watcher thread while safepoint is in progress so that it would not appear as though the
3368 // system is making progress.
3369 if (!Solaris::T2_libthread() &&
3370 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3371 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3372 // the entire safepoint, the watcher thread will line up here during the safepoint.
3373 Threads_lock->lock_without_safepoint_check();
3374 Threads_lock->unlock();
3375 }
3376
3377 if (thread->is_Java_thread()) {
3378 // This is a JavaThread so we honor the _thread_blocked protocol
3379 // even for sleeps of 0 milliseconds. This was originally done
3380 // as a workaround for bug 4338139. However, now we also do it
3381 // to honor the suspend-equivalent protocol.
3382
3383 JavaThread *jt = (JavaThread *) thread;
3384 ThreadBlockInVM tbivm(jt);
3385
3386 jt->set_suspend_equivalent();
3387 // cleared by handle_special_suspend_equivalent_condition() or
3388 // java_suspend_self() via check_and_wait_while_suspended()
3389
3390 int ret_code;
3391 if (millis <= 0) {
3392 thr_yield();
3393 ret_code = 0;
3394 } else {
3395 // The original sleep() implementation did not create an
3396 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3397 // I'm preserving that decision for now.
3398 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3399
3400 ret_code = os_sleep(millis, interruptible);
3401 }
3402
3403 // were we externally suspended while we were waiting?
3404 jt->check_and_wait_while_suspended();
3405
3406 return ret_code;
3407 }
3408
3409 // non-JavaThread from this point on:
3410
3411 if (millis <= 0) {
3412 thr_yield();
3413 return 0;
3414 }
3415
3416 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3417
3418 return os_sleep(millis, interruptible);
3419 }
3420
3421 void os::naked_short_sleep(jlong ms) {
3422 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3423
3424 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3425 // Solaris requires -lrt for this.
3426 usleep((ms * 1000));
3427
3428 return;
3429 }
3430
3431 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3432 void os::infinite_sleep() {
3433 while (true) { // sleep forever ...
3434 ::sleep(100); // ... 100 seconds at a time
3435 }
3436 }
3437
3438 // Used to convert frequent JVM_Yield() to nops
3439 bool os::dont_yield() {
3440 if (DontYieldALot) {
3441 static hrtime_t last_time = 0;
3442 hrtime_t diff = getTimeNanos() - last_time;
3443
3444 if (diff < DontYieldALotInterval * 1000000)
3445 return true;
3446
3447 last_time += diff;
3448
3449 return false;
3450 }
3451 else {
3452 return false;
3453 }
3454 }
3455
3456 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3457 // the linux and win32 implementations do not. This should be checked.
3458
3459 void os::yield() {
3460 // Yields to all threads with same or greater priority
3461 os::sleep(Thread::current(), 0, false);
3462 }
3463
3464 // Note that yield semantics are defined by the scheduling class to which
3465 // the thread currently belongs. Typically, yield will _not yield to
3466 // other equal or higher priority threads that reside on the dispatch queues
3467 // of other CPUs.
3468
3469 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3470
3471
3472 // On Solaris we found that yield_all doesn't always yield to all other threads.
3473 // There have been cases where there is a thread ready to execute but it doesn't
3474 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3475 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3476 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3477 // number of times yield_all is called in the one loop and increase the sleep
3478 // time after 8 attempts. If this fails too we increase the concurrency level
3479 // so that the starving thread would get an lwp
3480
3481 void os::yield_all(int attempts) {
3482 // Yields to all threads, including threads with lower priorities
3483 if (attempts == 0) {
3484 os::sleep(Thread::current(), 1, false);
3485 } else {
3486 int iterations = attempts % 30;
3487 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3488 // thr_setconcurrency and _getconcurrency make sense only under T1.
3489 int noofLWPS = thr_getconcurrency();
3490 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3491 thr_setconcurrency(thr_getconcurrency() + 1);
3492 }
3493 } else if (iterations < 25) {
3494 os::sleep(Thread::current(), 1, false);
3495 } else {
3496 os::sleep(Thread::current(), 10, false);
3497 }
3498 }
3499 }
3500
3501 // Called from the tight loops to possibly influence time-sharing heuristics
3502 void os::loop_breaker(int attempts) {
3503 os::yield_all(attempts);
3504 }
3505
3506
3507 // Interface for setting lwp priorities. If we are using T2 libthread,
3508 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3509 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3510 // function is meaningless in this mode so we must adjust the real lwp's priority
3511 // The routines below implement the getting and setting of lwp priorities.
3512 //
3513 // Note: There are three priority scales used on Solaris. Java priotities
3514 // which range from 1 to 10, libthread "thr_setprio" scale which range
3515 // from 0 to 127, and the current scheduling class of the process we
3516 // are running in. This is typically from -60 to +60.
3517 // The setting of the lwp priorities in done after a call to thr_setprio
3518 // so Java priorities are mapped to libthread priorities and we map from
3519 // the latter to lwp priorities. We don't keep priorities stored in
3520 // Java priorities since some of our worker threads want to set priorities
3521 // higher than all Java threads.
3522 //
3523 // For related information:
3524 // (1) man -s 2 priocntl
3525 // (2) man -s 4 priocntl
3526 // (3) man dispadmin
3527 // = librt.so
3528 // = libthread/common/rtsched.c - thrp_setlwpprio().
3529 // = ps -cL <pid> ... to validate priority.
3530 // = sched_get_priority_min and _max
3531 // pthread_create
3532 // sched_setparam
3533 // pthread_setschedparam
3534 //
3535 // Assumptions:
3536 // + We assume that all threads in the process belong to the same
3537 // scheduling class. IE. an homogenous process.
3538 // + Must be root or in IA group to change change "interactive" attribute.
3539 // Priocntl() will fail silently. The only indication of failure is when
3540 // we read-back the value and notice that it hasn't changed.
3541 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3542 // + For RT, change timeslice as well. Invariant:
3543 // constant "priority integral"
3544 // Konst == TimeSlice * (60-Priority)
3545 // Given a priority, compute appropriate timeslice.
3546 // + Higher numerical values have higher priority.
3547
3548 // sched class attributes
3549 typedef struct {
3550 int schedPolicy; // classID
3551 int maxPrio;
3552 int minPrio;
3553 } SchedInfo;
3554
3555
3556 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3557
3558 #ifdef ASSERT
3559 static int ReadBackValidate = 1;
3560 #endif
3561 static int myClass = 0;
3562 static int myMin = 0;
3563 static int myMax = 0;
3564 static int myCur = 0;
3565 static bool priocntl_enable = false;
3566
3567 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3568 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3569
3570
3571 // lwp_priocntl_init
3572 //
3573 // Try to determine the priority scale for our process.
3574 //
3575 // Return errno or 0 if OK.
3576 //
3577 static int lwp_priocntl_init () {
3578 int rslt;
3579 pcinfo_t ClassInfo;
3580 pcparms_t ParmInfo;
3581 int i;
3582
3583 if (!UseThreadPriorities) return 0;
3584
3585 // We are using Bound threads, we need to determine our priority ranges
3586 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3587 // If ThreadPriorityPolicy is 1, switch tables
3588 if (ThreadPriorityPolicy == 1) {
3589 for (i = 0 ; i < CriticalPriority+1; i++)
3590 os::java_to_os_priority[i] = prio_policy1[i];
3591 }
3592 if (UseCriticalJavaThreadPriority) {
3593 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3594 // See set_native_priority() and set_lwp_class_and_priority().
3595 // Save original MaxPriority mapping in case attempt to
3596 // use critical priority fails.
3597 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3598 // Set negative to distinguish from other priorities
3599 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3600 }
3601 }
3602 // Not using Bound Threads, set to ThreadPolicy 1
3603 else {
3604 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3605 os::java_to_os_priority[i] = prio_policy1[i];
3606 }
3607 return 0;
3608 }
3609
3610 // Get IDs for a set of well-known scheduling classes.
3611 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3612 // the system. We should have a loop that iterates over the
3613 // classID values, which are known to be "small" integers.
3614
3615 strcpy(ClassInfo.pc_clname, "TS");
3616 ClassInfo.pc_cid = -1;
3617 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3618 if (rslt < 0) return errno;
3619 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3620 tsLimits.schedPolicy = ClassInfo.pc_cid;
3621 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3622 tsLimits.minPrio = -tsLimits.maxPrio;
3623
3624 strcpy(ClassInfo.pc_clname, "IA");
3625 ClassInfo.pc_cid = -1;
3626 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3627 if (rslt < 0) return errno;
3628 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3629 iaLimits.schedPolicy = ClassInfo.pc_cid;
3630 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3631 iaLimits.minPrio = -iaLimits.maxPrio;
3632
3633 strcpy(ClassInfo.pc_clname, "RT");
3634 ClassInfo.pc_cid = -1;
3635 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3636 if (rslt < 0) return errno;
3637 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3638 rtLimits.schedPolicy = ClassInfo.pc_cid;
3639 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3640 rtLimits.minPrio = 0;
3641
3642 strcpy(ClassInfo.pc_clname, "FX");
3643 ClassInfo.pc_cid = -1;
3644 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3645 if (rslt < 0) return errno;
3646 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3647 fxLimits.schedPolicy = ClassInfo.pc_cid;
3648 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3649 fxLimits.minPrio = 0;
3650
3651 // Query our "current" scheduling class.
3652 // This will normally be IA, TS or, rarely, FX or RT.
3653 memset(&ParmInfo, 0, sizeof(ParmInfo));
3654 ParmInfo.pc_cid = PC_CLNULL;
3655 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3656 if (rslt < 0) return errno;
3657 myClass = ParmInfo.pc_cid;
3658
3659 // We now know our scheduling classId, get specific information
3660 // about the class.
3661 ClassInfo.pc_cid = myClass;
3662 ClassInfo.pc_clname[0] = 0;
3663 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3664 if (rslt < 0) return errno;
3665
3666 if (ThreadPriorityVerbose) {
3667 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3668 }
3669
3670 memset(&ParmInfo, 0, sizeof(pcparms_t));
3671 ParmInfo.pc_cid = PC_CLNULL;
3672 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3673 if (rslt < 0) return errno;
3674
3675 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3676 myMin = rtLimits.minPrio;
3677 myMax = rtLimits.maxPrio;
3678 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3679 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3680 myMin = iaLimits.minPrio;
3681 myMax = iaLimits.maxPrio;
3682 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3683 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3684 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3685 myMin = tsLimits.minPrio;
3686 myMax = tsLimits.maxPrio;
3687 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3688 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3689 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3690 myMin = fxLimits.minPrio;
3691 myMax = fxLimits.maxPrio;
3692 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3693 } else {
3694 // No clue - punt
3695 if (ThreadPriorityVerbose)
3696 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3697 return EINVAL; // no clue, punt
3698 }
3699
3700 if (ThreadPriorityVerbose) {
3701 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3702 }
3703
3704 priocntl_enable = true; // Enable changing priorities
3705 return 0;
3706 }
3707
3708 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3709 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3710 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3711 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3712
3713
3714 // scale_to_lwp_priority
3715 //
3716 // Convert from the libthread "thr_setprio" scale to our current
3717 // lwp scheduling class scale.
3718 //
3719 static
3720 int scale_to_lwp_priority (int rMin, int rMax, int x)
3721 {
3722 int v;
3723
3724 if (x == 127) return rMax; // avoid round-down
3725 v = (((x*(rMax-rMin)))/128)+rMin;
3726 return v;
3727 }
3728
3729
3730 // set_lwp_class_and_priority
3731 //
3732 // Set the class and priority of the lwp. This call should only
3733 // be made when using bound threads (T2 threads are bound by default).
3734 //
3735 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3736 int newPrio, int new_class, bool scale) {
3737 int rslt;
3738 int Actual, Expected, prv;
3739 pcparms_t ParmInfo; // for GET-SET
3740 #ifdef ASSERT
3741 pcparms_t ReadBack; // for readback
3742 #endif
3743
3744 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3745 // Query current values.
3746 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3747 // Cache "pcparms_t" in global ParmCache.
3748 // TODO: elide set-to-same-value
3749
3750 // If something went wrong on init, don't change priorities.
3751 if ( !priocntl_enable ) {
3752 if (ThreadPriorityVerbose)
3753 tty->print_cr("Trying to set priority but init failed, ignoring");
3754 return EINVAL;
3755 }
3756
3757 // If lwp hasn't started yet, just return
3758 // the _start routine will call us again.
3759 if ( lwpid <= 0 ) {
3760 if (ThreadPriorityVerbose) {
3761 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3762 INTPTR_FORMAT " to %d, lwpid not set",
3763 ThreadID, newPrio);
3764 }
3765 return 0;
3766 }
3767
3768 if (ThreadPriorityVerbose) {
3769 tty->print_cr ("set_lwp_class_and_priority("
3770 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3771 ThreadID, lwpid, newPrio);
3772 }
3773
3774 memset(&ParmInfo, 0, sizeof(pcparms_t));
3775 ParmInfo.pc_cid = PC_CLNULL;
3776 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3777 if (rslt < 0) return errno;
3778
3779 int cur_class = ParmInfo.pc_cid;
3780 ParmInfo.pc_cid = (id_t)new_class;
3781
3782 if (new_class == rtLimits.schedPolicy) {
3783 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3784 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3785 rtLimits.maxPrio, newPrio)
3786 : newPrio;
3787 rtInfo->rt_tqsecs = RT_NOCHANGE;
3788 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3789 if (ThreadPriorityVerbose) {
3790 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3791 }
3792 } else if (new_class == iaLimits.schedPolicy) {
3793 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3794 int maxClamped = MIN2(iaLimits.maxPrio,
3795 cur_class == new_class
3796 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3797 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3798 maxClamped, newPrio)
3799 : newPrio;
3800 iaInfo->ia_uprilim = cur_class == new_class
3801 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3802 iaInfo->ia_mode = IA_NOCHANGE;
3803 if (ThreadPriorityVerbose) {
3804 tty->print_cr("IA: [%d...%d] %d->%d\n",
3805 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3806 }
3807 } else if (new_class == tsLimits.schedPolicy) {
3808 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3809 int maxClamped = MIN2(tsLimits.maxPrio,
3810 cur_class == new_class
3811 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3812 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3813 maxClamped, newPrio)
3814 : newPrio;
3815 tsInfo->ts_uprilim = cur_class == new_class
3816 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3817 if (ThreadPriorityVerbose) {
3818 tty->print_cr("TS: [%d...%d] %d->%d\n",
3819 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3820 }
3821 } else if (new_class == fxLimits.schedPolicy) {
3822 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3823 int maxClamped = MIN2(fxLimits.maxPrio,
3824 cur_class == new_class
3825 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3826 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3827 maxClamped, newPrio)
3828 : newPrio;
3829 fxInfo->fx_uprilim = cur_class == new_class
3830 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3831 fxInfo->fx_tqsecs = FX_NOCHANGE;
3832 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3833 if (ThreadPriorityVerbose) {
3834 tty->print_cr("FX: [%d...%d] %d->%d\n",
3835 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3836 }
3837 } else {
3838 if (ThreadPriorityVerbose) {
3839 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3840 }
3841 return EINVAL; // no clue, punt
3842 }
3843
3844 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3845 if (ThreadPriorityVerbose && rslt) {
3846 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3847 }
3848 if (rslt < 0) return errno;
3849
3850 #ifdef ASSERT
3851 // Sanity check: read back what we just attempted to set.
3852 // In theory it could have changed in the interim ...
3853 //
3854 // The priocntl system call is tricky.
3855 // Sometimes it'll validate the priority value argument and
3856 // return EINVAL if unhappy. At other times it fails silently.
3857 // Readbacks are prudent.
3858
3859 if (!ReadBackValidate) return 0;
3860
3861 memset(&ReadBack, 0, sizeof(pcparms_t));
3862 ReadBack.pc_cid = PC_CLNULL;
3863 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3864 assert(rslt >= 0, "priocntl failed");
3865 Actual = Expected = 0xBAD;
3866 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3867 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3868 Actual = RTPRI(ReadBack)->rt_pri;
3869 Expected = RTPRI(ParmInfo)->rt_pri;
3870 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3871 Actual = IAPRI(ReadBack)->ia_upri;
3872 Expected = IAPRI(ParmInfo)->ia_upri;
3873 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3874 Actual = TSPRI(ReadBack)->ts_upri;
3875 Expected = TSPRI(ParmInfo)->ts_upri;
3876 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3877 Actual = FXPRI(ReadBack)->fx_upri;
3878 Expected = FXPRI(ParmInfo)->fx_upri;
3879 } else {
3880 if (ThreadPriorityVerbose) {
3881 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3882 ParmInfo.pc_cid);
3883 }
3884 }
3885
3886 if (Actual != Expected) {
3887 if (ThreadPriorityVerbose) {
3888 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3889 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3890 }
3891 }
3892 #endif
3893
3894 return 0;
3895 }
3896
3897 // Solaris only gives access to 128 real priorities at a time,
3898 // so we expand Java's ten to fill this range. This would be better
3899 // if we dynamically adjusted relative priorities.
3900 //
3901 // The ThreadPriorityPolicy option allows us to select 2 different
3902 // priority scales.
3903 //
3904 // ThreadPriorityPolicy=0
3905 // Since the Solaris' default priority is MaximumPriority, we do not
3906 // set a priority lower than Max unless a priority lower than
3907 // NormPriority is requested.
3908 //
3909 // ThreadPriorityPolicy=1
3910 // This mode causes the priority table to get filled with
3911 // linear values. NormPriority get's mapped to 50% of the
3912 // Maximum priority an so on. This will cause VM threads
3913 // to get unfair treatment against other Solaris processes
3914 // which do not explicitly alter their thread priorities.
3915 //
3916
3917 int os::java_to_os_priority[CriticalPriority + 1] = {
3918 -99999, // 0 Entry should never be used
3919
3920 0, // 1 MinPriority
3921 32, // 2
3922 64, // 3
3923
3924 96, // 4
3925 127, // 5 NormPriority
3926 127, // 6
3927
3928 127, // 7
3929 127, // 8
3930 127, // 9 NearMaxPriority
3931
3932 127, // 10 MaxPriority
3933
3934 -criticalPrio // 11 CriticalPriority
3935 };
3936
3937 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3938 OSThread* osthread = thread->osthread();
3939
3940 // Save requested priority in case the thread hasn't been started
3941 osthread->set_native_priority(newpri);
3942
3943 // Check for critical priority request
3944 bool fxcritical = false;
3945 if (newpri == -criticalPrio) {
3946 fxcritical = true;
3947 newpri = criticalPrio;
3948 }
3949
3950 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3951 if (!UseThreadPriorities) return OS_OK;
3952
3953 int status = 0;
3954
3955 if (!fxcritical) {
3956 // Use thr_setprio only if we have a priority that thr_setprio understands
3957 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3958 }
3959
3960 if (os::Solaris::T2_libthread() ||
3961 (UseBoundThreads && osthread->is_vm_created())) {
3962 int lwp_status =
3963 set_lwp_class_and_priority(osthread->thread_id(),
3964 osthread->lwp_id(),
3965 newpri,
3966 fxcritical ? fxLimits.schedPolicy : myClass,
3967 !fxcritical);
3968 if (lwp_status != 0 && fxcritical) {
3969 // Try again, this time without changing the scheduling class
3970 newpri = java_MaxPriority_to_os_priority;
3971 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3972 osthread->lwp_id(),
3973 newpri, myClass, false);
3974 }
3975 status |= lwp_status;
3976 }
3977 return (status == 0) ? OS_OK : OS_ERR;
3978 }
3979
3980
3981 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3982 int p;
3983 if ( !UseThreadPriorities ) {
3984 *priority_ptr = NormalPriority;
3985 return OS_OK;
3986 }
3987 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3988 if (status != 0) {
3989 return OS_ERR;
3990 }
3991 *priority_ptr = p;
3992 return OS_OK;
3993 }
3994
3995
3996 // Hint to the underlying OS that a task switch would not be good.
3997 // Void return because it's a hint and can fail.
3998 void os::hint_no_preempt() {
3999 schedctl_start(schedctl_init());
4000 }
4001
4002 static void resume_clear_context(OSThread *osthread) {
4003 osthread->set_ucontext(NULL);
4004 }
4005
4006 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
4007 osthread->set_ucontext(context);
4008 }
4009
4010 static Semaphore sr_semaphore;
4011
4012 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
4013 // Save and restore errno to avoid confusing native code with EINTR
4014 // after sigsuspend.
4015 int old_errno = errno;
4016
4017 OSThread* osthread = thread->osthread();
4018 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
4019
4020 os::SuspendResume::State current = osthread->sr.state();
4021 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
4022 suspend_save_context(osthread, uc);
4023
4024 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
4025 os::SuspendResume::State state = osthread->sr.suspended();
4026 if (state == os::SuspendResume::SR_SUSPENDED) {
4027 sigset_t suspend_set; // signals for sigsuspend()
4028
4029 // get current set of blocked signals and unblock resume signal
4030 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
4031 sigdelset(&suspend_set, os::Solaris::SIGasync());
4032
4033 sr_semaphore.signal();
4034 // wait here until we are resumed
4035 while (1) {
4036 sigsuspend(&suspend_set);
4037
4038 os::SuspendResume::State result = osthread->sr.running();
4039 if (result == os::SuspendResume::SR_RUNNING) {
4040 sr_semaphore.signal();
4041 break;
4042 }
4043 }
4044
4045 } else if (state == os::SuspendResume::SR_RUNNING) {
4046 // request was cancelled, continue
4047 } else {
4048 ShouldNotReachHere();
4049 }
4050
4051 resume_clear_context(osthread);
4052 } else if (current == os::SuspendResume::SR_RUNNING) {
4053 // request was cancelled, continue
4054 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
4055 // ignore
4056 } else {
4057 // ignore
4058 }
4059
4060 errno = old_errno;
4061 }
4062
4063
4064 void os::interrupt(Thread* thread) {
4065 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4066
4067 OSThread* osthread = thread->osthread();
4068
4069 int isInterrupted = osthread->interrupted();
4070 if (!isInterrupted) {
4071 osthread->set_interrupted(true);
4072 OrderAccess::fence();
4073 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4074 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4075 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4076 ParkEvent * const slp = thread->_SleepEvent ;
4077 if (slp != NULL) slp->unpark() ;
4078 }
4079
4080 // For JSR166: unpark after setting status but before thr_kill -dl
4081 if (thread->is_Java_thread()) {
4082 ((JavaThread*)thread)->parker()->unpark();
4083 }
4084
4085 // Handle interruptible wait() ...
4086 ParkEvent * const ev = thread->_ParkEvent ;
4087 if (ev != NULL) ev->unpark() ;
4088
4089 // When events are used everywhere for os::sleep, then this thr_kill
4090 // will only be needed if UseVMInterruptibleIO is true.
4091
4092 if (!isInterrupted) {
4093 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4094 assert_status(status == 0, status, "thr_kill");
4095
4096 // Bump thread interruption counter
4097 RuntimeService::record_thread_interrupt_signaled_count();
4098 }
4099 }
4100
4101
4102 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4103 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4104
4105 OSThread* osthread = thread->osthread();
4106
4107 bool res = osthread->interrupted();
4108
4109 // NOTE that since there is no "lock" around these two operations,
4110 // there is the possibility that the interrupted flag will be
4111 // "false" but that the interrupt event will be set. This is
4112 // intentional. The effect of this is that Object.wait() will appear
4113 // to have a spurious wakeup, which is not harmful, and the
4114 // possibility is so rare that it is not worth the added complexity
4115 // to add yet another lock. It has also been recommended not to put
4116 // the interrupted flag into the os::Solaris::Event structure,
4117 // because it hides the issue.
4118 if (res && clear_interrupted) {
4119 osthread->set_interrupted(false);
4120 }
4121 return res;
4122 }
4123
4124
4125 void os::print_statistics() {
4126 }
4127
4128 int os::message_box(const char* title, const char* message) {
4129 int i;
4130 fdStream err(defaultStream::error_fd());
4131 for (i = 0; i < 78; i++) err.print_raw("=");
4132 err.cr();
4133 err.print_raw_cr(title);
4134 for (i = 0; i < 78; i++) err.print_raw("-");
4135 err.cr();
4136 err.print_raw_cr(message);
4137 for (i = 0; i < 78; i++) err.print_raw("=");
4138 err.cr();
4139
4140 char buf[16];
4141 // Prevent process from exiting upon "read error" without consuming all CPU
4142 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4143
4144 return buf[0] == 'y' || buf[0] == 'Y';
4145 }
4146
4147 static int sr_notify(OSThread* osthread) {
4148 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4149 assert_status(status == 0, status, "thr_kill");
4150 return status;
4151 }
4152
4153 // "Randomly" selected value for how long we want to spin
4154 // before bailing out on suspending a thread, also how often
4155 // we send a signal to a thread we want to resume
4156 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4157 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4158
4159 static bool do_suspend(OSThread* osthread) {
4160 assert(osthread->sr.is_running(), "thread should be running");
4161 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4162
4163 // mark as suspended and send signal
4164 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4165 // failed to switch, state wasn't running?
4166 ShouldNotReachHere();
4167 return false;
4168 }
4169
4170 if (sr_notify(osthread) != 0) {
4171 ShouldNotReachHere();
4172 }
4173
4174 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4175 while (true) {
4176 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4177 break;
4178 } else {
4179 // timeout
4180 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4181 if (cancelled == os::SuspendResume::SR_RUNNING) {
4182 return false;
4183 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4184 // make sure that we consume the signal on the semaphore as well
4185 sr_semaphore.wait();
4186 break;
4187 } else {
4188 ShouldNotReachHere();
4189 return false;
4190 }
4191 }
4192 }
4193
4194 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4195 return true;
4196 }
4197
4198 static void do_resume(OSThread* osthread) {
4199 assert(osthread->sr.is_suspended(), "thread should be suspended");
4200 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4201
4202 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4203 // failed to switch to WAKEUP_REQUEST
4204 ShouldNotReachHere();
4205 return;
4206 }
4207
4208 while (true) {
4209 if (sr_notify(osthread) == 0) {
4210 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4211 if (osthread->sr.is_running()) {
4212 return;
4213 }
4214 }
4215 } else {
4216 ShouldNotReachHere();
4217 }
4218 }
4219
4220 guarantee(osthread->sr.is_running(), "Must be running!");
4221 }
4222
4223 void os::SuspendedThreadTask::internal_do_task() {
4224 if (do_suspend(_thread->osthread())) {
4225 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4226 do_task(context);
4227 do_resume(_thread->osthread());
4228 }
4229 }
4230
4231 class PcFetcher : public os::SuspendedThreadTask {
4232 public:
4233 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4234 ExtendedPC result();
4235 protected:
4236 void do_task(const os::SuspendedThreadTaskContext& context);
4237 private:
4238 ExtendedPC _epc;
4239 };
4240
4241 ExtendedPC PcFetcher::result() {
4242 guarantee(is_done(), "task is not done yet.");
4243 return _epc;
4244 }
4245
4246 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4247 Thread* thread = context.thread();
4248 OSThread* osthread = thread->osthread();
4249 if (osthread->ucontext() != NULL) {
4250 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4251 } else {
4252 // NULL context is unexpected, double-check this is the VMThread
4253 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4254 }
4255 }
4256
4257 // A lightweight implementation that does not suspend the target thread and
4258 // thus returns only a hint. Used for profiling only!
4259 ExtendedPC os::get_thread_pc(Thread* thread) {
4260 // Make sure that it is called by the watcher and the Threads lock is owned.
4261 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4262 // For now, is only used to profile the VM Thread
4263 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4264 PcFetcher fetcher(thread);
4265 fetcher.run();
4266 return fetcher.result();
4267 }
4268
4269
4270 // This does not do anything on Solaris. This is basically a hook for being
4271 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4272 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4273 f(value, method, args, thread);
4274 }
4275
4276 // This routine may be used by user applications as a "hook" to catch signals.
4277 // The user-defined signal handler must pass unrecognized signals to this
4278 // routine, and if it returns true (non-zero), then the signal handler must
4279 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4280 // routine will never retun false (zero), but instead will execute a VM panic
4281 // routine kill the process.
4282 //
4283 // If this routine returns false, it is OK to call it again. This allows
4284 // the user-defined signal handler to perform checks either before or after
4285 // the VM performs its own checks. Naturally, the user code would be making
4286 // a serious error if it tried to handle an exception (such as a null check
4287 // or breakpoint) that the VM was generating for its own correct operation.
4288 //
4289 // This routine may recognize any of the following kinds of signals:
4290 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4291 // os::Solaris::SIGasync
4292 // It should be consulted by handlers for any of those signals.
4293 // It explicitly does not recognize os::Solaris::SIGinterrupt
4294 //
4295 // The caller of this routine must pass in the three arguments supplied
4296 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4297 // field of the structure passed to sigaction(). This routine assumes that
4298 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4299 //
4300 // Note that the VM will print warnings if it detects conflicting signal
4301 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4302 //
4303 extern "C" JNIEXPORT int
4304 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4305 int abort_if_unrecognized);
4306
4307
4308 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4309 int orig_errno = errno; // Preserve errno value over signal handler.
4310 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4311 errno = orig_errno;
4312 }
4313
4314 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4315 is needed to provoke threads blocked on IO to return an EINTR
4316 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4317 does NOT participate in signal chaining due to requirement for
4318 NOT setting SA_RESTART to make EINTR work. */
4319 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4320 if (UseSignalChaining) {
4321 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4322 if (actp && actp->sa_handler) {
4323 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4324 }
4325 }
4326 }
4327
4328 // This boolean allows users to forward their own non-matching signals
4329 // to JVM_handle_solaris_signal, harmlessly.
4330 bool os::Solaris::signal_handlers_are_installed = false;
4331
4332 // For signal-chaining
4333 bool os::Solaris::libjsig_is_loaded = false;
4334 typedef struct sigaction *(*get_signal_t)(int);
4335 get_signal_t os::Solaris::get_signal_action = NULL;
4336
4337 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4338 struct sigaction *actp = NULL;
4339
4340 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4341 // Retrieve the old signal handler from libjsig
4342 actp = (*get_signal_action)(sig);
4343 }
4344 if (actp == NULL) {
4345 // Retrieve the preinstalled signal handler from jvm
4346 actp = get_preinstalled_handler(sig);
4347 }
4348
4349 return actp;
4350 }
4351
4352 static bool call_chained_handler(struct sigaction *actp, int sig,
4353 siginfo_t *siginfo, void *context) {
4354 // Call the old signal handler
4355 if (actp->sa_handler == SIG_DFL) {
4356 // It's more reasonable to let jvm treat it as an unexpected exception
4357 // instead of taking the default action.
4358 return false;
4359 } else if (actp->sa_handler != SIG_IGN) {
4360 if ((actp->sa_flags & SA_NODEFER) == 0) {
4361 // automaticlly block the signal
4362 sigaddset(&(actp->sa_mask), sig);
4363 }
4364
4365 sa_handler_t hand;
4366 sa_sigaction_t sa;
4367 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4368 // retrieve the chained handler
4369 if (siginfo_flag_set) {
4370 sa = actp->sa_sigaction;
4371 } else {
4372 hand = actp->sa_handler;
4373 }
4374
4375 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4376 actp->sa_handler = SIG_DFL;
4377 }
4378
4379 // try to honor the signal mask
4380 sigset_t oset;
4381 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4382
4383 // call into the chained handler
4384 if (siginfo_flag_set) {
4385 (*sa)(sig, siginfo, context);
4386 } else {
4387 (*hand)(sig);
4388 }
4389
4390 // restore the signal mask
4391 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4392 }
4393 // Tell jvm's signal handler the signal is taken care of.
4394 return true;
4395 }
4396
4397 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4398 bool chained = false;
4399 // signal-chaining
4400 if (UseSignalChaining) {
4401 struct sigaction *actp = get_chained_signal_action(sig);
4402 if (actp != NULL) {
4403 chained = call_chained_handler(actp, sig, siginfo, context);
4404 }
4405 }
4406 return chained;
4407 }
4408
4409 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4410 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4411 if (preinstalled_sigs[sig] != 0) {
4412 return &chainedsigactions[sig];
4413 }
4414 return NULL;
4415 }
4416
4417 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4418
4419 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4420 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4421 chainedsigactions[sig] = oldAct;
4422 preinstalled_sigs[sig] = 1;
4423 }
4424
4425 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4426 // Check for overwrite.
4427 struct sigaction oldAct;
4428 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4429 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4430 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4431 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4432 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4433 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4434 if (AllowUserSignalHandlers || !set_installed) {
4435 // Do not overwrite; user takes responsibility to forward to us.
4436 return;
4437 } else if (UseSignalChaining) {
4438 if (oktochain) {
4439 // save the old handler in jvm
4440 save_preinstalled_handler(sig, oldAct);
4441 } else {
4442 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4443 }
4444 // libjsig also interposes the sigaction() call below and saves the
4445 // old sigaction on it own.
4446 } else {
4447 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4448 "%#lx for signal %d.", (long)oldhand, sig));
4449 }
4450 }
4451
4452 struct sigaction sigAct;
4453 sigfillset(&(sigAct.sa_mask));
4454 sigAct.sa_handler = SIG_DFL;
4455
4456 sigAct.sa_sigaction = signalHandler;
4457 // Handle SIGSEGV on alternate signal stack if
4458 // not using stack banging
4459 if (!UseStackBanging && sig == SIGSEGV) {
4460 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4461 // Interruptible i/o requires SA_RESTART cleared so EINTR
4462 // is returned instead of restarting system calls
4463 } else if (sig == os::Solaris::SIGinterrupt()) {
4464 sigemptyset(&sigAct.sa_mask);
4465 sigAct.sa_handler = NULL;
4466 sigAct.sa_flags = SA_SIGINFO;
4467 sigAct.sa_sigaction = sigINTRHandler;
4468 } else {
4469 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4470 }
4471 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4472
4473 sigaction(sig, &sigAct, &oldAct);
4474
4475 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4476 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4477 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4478 }
4479
4480
4481 #define DO_SIGNAL_CHECK(sig) \
4482 if (!sigismember(&check_signal_done, sig)) \
4483 os::Solaris::check_signal_handler(sig)
4484
4485 // This method is a periodic task to check for misbehaving JNI applications
4486 // under CheckJNI, we can add any periodic checks here
4487
4488 void os::run_periodic_checks() {
4489 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4490 // thereby preventing a NULL checks.
4491 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4492
4493 if (check_signals == false) return;
4494
4495 // SEGV and BUS if overridden could potentially prevent
4496 // generation of hs*.log in the event of a crash, debugging
4497 // such a case can be very challenging, so we absolutely
4498 // check for the following for a good measure:
4499 DO_SIGNAL_CHECK(SIGSEGV);
4500 DO_SIGNAL_CHECK(SIGILL);
4501 DO_SIGNAL_CHECK(SIGFPE);
4502 DO_SIGNAL_CHECK(SIGBUS);
4503 DO_SIGNAL_CHECK(SIGPIPE);
4504 DO_SIGNAL_CHECK(SIGXFSZ);
4505
4506 // ReduceSignalUsage allows the user to override these handlers
4507 // see comments at the very top and jvm_solaris.h
4508 if (!ReduceSignalUsage) {
4509 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4510 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4511 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4512 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4513 }
4514
4515 // See comments above for using JVM1/JVM2 and UseAltSigs
4516 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4517 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4518
4519 }
4520
4521 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4522
4523 static os_sigaction_t os_sigaction = NULL;
4524
4525 void os::Solaris::check_signal_handler(int sig) {
4526 char buf[O_BUFLEN];
4527 address jvmHandler = NULL;
4528
4529 struct sigaction act;
4530 if (os_sigaction == NULL) {
4531 // only trust the default sigaction, in case it has been interposed
4532 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4533 if (os_sigaction == NULL) return;
4534 }
4535
4536 os_sigaction(sig, (struct sigaction*)NULL, &act);
4537
4538 address thisHandler = (act.sa_flags & SA_SIGINFO)
4539 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4540 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4541
4542
4543 switch(sig) {
4544 case SIGSEGV:
4545 case SIGBUS:
4546 case SIGFPE:
4547 case SIGPIPE:
4548 case SIGXFSZ:
4549 case SIGILL:
4550 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4551 break;
4552
4553 case SHUTDOWN1_SIGNAL:
4554 case SHUTDOWN2_SIGNAL:
4555 case SHUTDOWN3_SIGNAL:
4556 case BREAK_SIGNAL:
4557 jvmHandler = (address)user_handler();
4558 break;
4559
4560 default:
4561 int intrsig = os::Solaris::SIGinterrupt();
4562 int asynsig = os::Solaris::SIGasync();
4563
4564 if (sig == intrsig) {
4565 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4566 } else if (sig == asynsig) {
4567 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4568 } else {
4569 return;
4570 }
4571 break;
4572 }
4573
4574
4575 if (thisHandler != jvmHandler) {
4576 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4577 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4578 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4579 // No need to check this sig any longer
4580 sigaddset(&check_signal_done, sig);
4581 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4582 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4583 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4584 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4585 // No need to check this sig any longer
4586 sigaddset(&check_signal_done, sig);
4587 }
4588
4589 // Print all the signal handler state
4590 if (sigismember(&check_signal_done, sig)) {
4591 print_signal_handlers(tty, buf, O_BUFLEN);
4592 }
4593
4594 }
4595
4596 void os::Solaris::install_signal_handlers() {
4597 bool libjsigdone = false;
4598 signal_handlers_are_installed = true;
4599
4600 // signal-chaining
4601 typedef void (*signal_setting_t)();
4602 signal_setting_t begin_signal_setting = NULL;
4603 signal_setting_t end_signal_setting = NULL;
4604 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4605 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4606 if (begin_signal_setting != NULL) {
4607 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4608 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4609 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4610 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4611 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4612 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4613 libjsig_is_loaded = true;
4614 if (os::Solaris::get_libjsig_version != NULL) {
4615 libjsigversion = (*os::Solaris::get_libjsig_version)();
4616 }
4617 assert(UseSignalChaining, "should enable signal-chaining");
4618 }
4619 if (libjsig_is_loaded) {
4620 // Tell libjsig jvm is setting signal handlers
4621 (*begin_signal_setting)();
4622 }
4623
4624 set_signal_handler(SIGSEGV, true, true);
4625 set_signal_handler(SIGPIPE, true, true);
4626 set_signal_handler(SIGXFSZ, true, true);
4627 set_signal_handler(SIGBUS, true, true);
4628 set_signal_handler(SIGILL, true, true);
4629 set_signal_handler(SIGFPE, true, true);
4630
4631
4632 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4633
4634 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4635 // can not register overridable signals which might be > 32
4636 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4637 // Tell libjsig jvm has finished setting signal handlers
4638 (*end_signal_setting)();
4639 libjsigdone = true;
4640 }
4641 }
4642
4643 // Never ok to chain our SIGinterrupt
4644 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4645 set_signal_handler(os::Solaris::SIGasync(), true, true);
4646
4647 if (libjsig_is_loaded && !libjsigdone) {
4648 // Tell libjsig jvm finishes setting signal handlers
4649 (*end_signal_setting)();
4650 }
4651
4652 // We don't activate signal checker if libjsig is in place, we trust ourselves
4653 // and if UserSignalHandler is installed all bets are off.
4654 // Log that signal checking is off only if -verbose:jni is specified.
4655 if (CheckJNICalls) {
4656 if (libjsig_is_loaded) {
4657 if (PrintJNIResolving) {
4658 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4659 }
4660 check_signals = false;
4661 }
4662 if (AllowUserSignalHandlers) {
4663 if (PrintJNIResolving) {
4664 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4665 }
4666 check_signals = false;
4667 }
4668 }
4669 }
4670
4671
4672 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4673
4674 const char * signames[] = {
4675 "SIG0",
4676 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4677 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4678 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4679 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4680 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4681 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4682 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4683 "SIGCANCEL", "SIGLOST"
4684 };
4685
4686 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4687 if (0 < exception_code && exception_code <= SIGRTMAX) {
4688 // signal
4689 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4690 jio_snprintf(buf, size, "%s", signames[exception_code]);
4691 } else {
4692 jio_snprintf(buf, size, "SIG%d", exception_code);
4693 }
4694 return buf;
4695 } else {
4696 return NULL;
4697 }
4698 }
4699
4700 // (Static) wrappers for the new libthread API
4701 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4702 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4703 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4704 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4705 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4706
4707 // (Static) wrapper for getisax(2) call.
4708 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4709
4710 // (Static) wrappers for the liblgrp API
4711 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4712 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4713 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4714 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4715 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4716 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4717 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4718 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4719 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4720
4721 // (Static) wrapper for meminfo() call.
4722 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4723
4724 static address resolve_symbol_lazy(const char* name) {
4725 address addr = (address) dlsym(RTLD_DEFAULT, name);
4726 if(addr == NULL) {
4727 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4728 addr = (address) dlsym(RTLD_NEXT, name);
4729 }
4730 return addr;
4731 }
4732
4733 static address resolve_symbol(const char* name) {
4734 address addr = resolve_symbol_lazy(name);
4735 if(addr == NULL) {
4736 fatal(dlerror());
4737 }
4738 return addr;
4739 }
4740
4741
4742
4743 // isT2_libthread()
4744 //
4745 // Routine to determine if we are currently using the new T2 libthread.
4746 //
4747 // We determine if we are using T2 by reading /proc/self/lstatus and
4748 // looking for a thread with the ASLWP bit set. If we find this status
4749 // bit set, we must assume that we are NOT using T2. The T2 team
4750 // has approved this algorithm.
4751 //
4752 // We need to determine if we are running with the new T2 libthread
4753 // since setting native thread priorities is handled differently
4754 // when using this library. All threads created using T2 are bound
4755 // threads. Calling thr_setprio is meaningless in this case.
4756 //
4757 bool isT2_libthread() {
4758 static prheader_t * lwpArray = NULL;
4759 static int lwpSize = 0;
4760 static int lwpFile = -1;
4761 lwpstatus_t * that;
4762 char lwpName [128];
4763 bool isT2 = false;
4764
4765 #define ADR(x) ((uintptr_t)(x))
4766 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4767
4768 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4769 if (lwpFile < 0) {
4770 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4771 return false;
4772 }
4773 lwpSize = 16*1024;
4774 for (;;) {
4775 ::lseek64 (lwpFile, 0, SEEK_SET);
4776 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4777 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4778 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4779 break;
4780 }
4781 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4782 // We got a good snapshot - now iterate over the list.
4783 int aslwpcount = 0;
4784 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4785 that = LWPINDEX(lwpArray,i);
4786 if (that->pr_flags & PR_ASLWP) {
4787 aslwpcount++;
4788 }
4789 }
4790 if (aslwpcount == 0) isT2 = true;
4791 break;
4792 }
4793 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4794 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4795 }
4796
4797 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4798 ::close (lwpFile);
4799 if (ThreadPriorityVerbose) {
4800 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4801 else tty->print_cr("We are not running with a T2 libthread\n");
4802 }
4803 return isT2;
4804 }
4805
4806
4807 void os::Solaris::libthread_init() {
4808 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4809
4810 // Determine if we are running with the new T2 libthread
4811 os::Solaris::set_T2_libthread(isT2_libthread());
4812
4813 lwp_priocntl_init();
4814
4815 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4816 if(func == NULL) {
4817 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4818 // Guarantee that this VM is running on an new enough OS (5.6 or
4819 // later) that it will have a new enough libthread.so.
4820 guarantee(func != NULL, "libthread.so is too old.");
4821 }
4822
4823 // Initialize the new libthread getstate API wrappers
4824 func = resolve_symbol("thr_getstate");
4825 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4826
4827 func = resolve_symbol("thr_setstate");
4828 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4829
4830 func = resolve_symbol("thr_setmutator");
4831 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4832
4833 func = resolve_symbol("thr_suspend_mutator");
4834 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4835
4836 func = resolve_symbol("thr_continue_mutator");
4837 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4838
4839 int size;
4840 void (*handler_info_func)(address *, int *);
4841 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4842 handler_info_func(&handler_start, &size);
4843 handler_end = handler_start + size;
4844 }
4845
4846
4847 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4848 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4849 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4850 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4851 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4852 int os::Solaris::_mutex_scope = USYNC_THREAD;
4853
4854 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4855 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4856 int_fnP_cond_tP os::Solaris::_cond_signal;
4857 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4858 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4859 int_fnP_cond_tP os::Solaris::_cond_destroy;
4860 int os::Solaris::_cond_scope = USYNC_THREAD;
4861
4862 void os::Solaris::synchronization_init() {
4863 if(UseLWPSynchronization) {
4864 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4865 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4866 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4867 os::Solaris::set_mutex_init(lwp_mutex_init);
4868 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4869 os::Solaris::set_mutex_scope(USYNC_THREAD);
4870
4871 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4872 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4873 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4874 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4875 os::Solaris::set_cond_init(lwp_cond_init);
4876 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4877 os::Solaris::set_cond_scope(USYNC_THREAD);
4878 }
4879 else {
4880 os::Solaris::set_mutex_scope(USYNC_THREAD);
4881 os::Solaris::set_cond_scope(USYNC_THREAD);
4882
4883 if(UsePthreads) {
4884 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4885 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4886 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4887 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4888 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4889
4890 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4891 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4892 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4893 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4894 os::Solaris::set_cond_init(pthread_cond_default_init);
4895 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4896 }
4897 else {
4898 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4899 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4900 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4901 os::Solaris::set_mutex_init(::mutex_init);
4902 os::Solaris::set_mutex_destroy(::mutex_destroy);
4903
4904 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4905 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4906 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4907 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4908 os::Solaris::set_cond_init(::cond_init);
4909 os::Solaris::set_cond_destroy(::cond_destroy);
4910 }
4911 }
4912 }
4913
4914 bool os::Solaris::liblgrp_init() {
4915 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4916 if (handle != NULL) {
4917 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4918 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4919 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4920 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4921 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4922 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4923 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4924 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4925 dlsym(handle, "lgrp_cookie_stale")));
4926
4927 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4928 set_lgrp_cookie(c);
4929 return true;
4930 }
4931 return false;
4932 }
4933
4934 void os::Solaris::misc_sym_init() {
4935 address func;
4936
4937 // getisax
4938 func = resolve_symbol_lazy("getisax");
4939 if (func != NULL) {
4940 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4941 }
4942
4943 // meminfo
4944 func = resolve_symbol_lazy("meminfo");
4945 if (func != NULL) {
4946 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4947 }
4948 }
4949
4950 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4951 assert(_getisax != NULL, "_getisax not set");
4952 return _getisax(array, n);
4953 }
4954
4955 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4956 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4957 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4958
4959 void init_pset_getloadavg_ptr(void) {
4960 pset_getloadavg_ptr =
4961 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4962 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4963 warning("pset_getloadavg function not found");
4964 }
4965 }
4966
4967 int os::Solaris::_dev_zero_fd = -1;
4968
4969 // this is called _before_ the global arguments have been parsed
4970 void os::init(void) {
4971 _initial_pid = getpid();
4972
4973 max_hrtime = first_hrtime = gethrtime();
4974
4975 init_random(1234567);
4976
4977 page_size = sysconf(_SC_PAGESIZE);
4978 if (page_size == -1)
4979 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4980 strerror(errno)));
4981 init_page_sizes((size_t) page_size);
4982
4983 Solaris::initialize_system_info();
4984
4985 // Initialize misc. symbols as soon as possible, so we can use them
4986 // if we need them.
4987 Solaris::misc_sym_init();
4988
4989 int fd = ::open("/dev/zero", O_RDWR);
4990 if (fd < 0) {
4991 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4992 } else {
4993 Solaris::set_dev_zero_fd(fd);
4994
4995 // Close on exec, child won't inherit.
4996 fcntl(fd, F_SETFD, FD_CLOEXEC);
4997 }
4998
4999 clock_tics_per_sec = CLK_TCK;
5000
5001 // check if dladdr1() exists; dladdr1 can provide more information than
5002 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
5003 // and is available on linker patches for 5.7 and 5.8.
5004 // libdl.so must have been loaded, this call is just an entry lookup
5005 void * hdl = dlopen("libdl.so", RTLD_NOW);
5006 if (hdl)
5007 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
5008
5009 // (Solaris only) this switches to calls that actually do locking.
5010 ThreadCritical::initialize();
5011
5012 main_thread = thr_self();
5013
5014 // Constant minimum stack size allowed. It must be at least
5015 // the minimum of what the OS supports (thr_min_stack()), and
5016 // enough to allow the thread to get to user bytecode execution.
5017 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
5018 // If the pagesize of the VM is greater than 8K determine the appropriate
5019 // number of initial guard pages. The user can change this with the
5020 // command line arguments, if needed.
5021 if (vm_page_size() > 8*K) {
5022 StackYellowPages = 1;
5023 StackRedPages = 1;
5024 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
5025 }
5026 }
5027
5028 // To install functions for atexit system call
5029 extern "C" {
5030 static void perfMemory_exit_helper() {
5031 perfMemory_exit();
5032 }
5033 }
5034
5035 // this is called _after_ the global arguments have been parsed
5036 jint os::init_2(void) {
5037 // try to enable extended file IO ASAP, see 6431278
5038 os::Solaris::try_enable_extended_io();
5039
5040 // Allocate a single page and mark it as readable for safepoint polling. Also
5041 // use this first mmap call to check support for MAP_ALIGN.
5042 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
5043 page_size,
5044 MAP_PRIVATE | MAP_ALIGN,
5045 PROT_READ);
5046 if (polling_page == NULL) {
5047 has_map_align = false;
5048 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
5049 PROT_READ);
5050 }
5051
5052 os::set_polling_page(polling_page);
5053
5054 #ifndef PRODUCT
5055 if( Verbose && PrintMiscellaneous )
5056 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
5057 #endif
5058
5059 if (!UseMembar) {
5060 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
5061 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
5062 os::set_memory_serialize_page( mem_serialize_page );
5063
5064 #ifndef PRODUCT
5065 if(Verbose && PrintMiscellaneous)
5066 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
5067 #endif
5068 }
5069
5070 // Check minimum allowable stack size for thread creation and to initialize
5071 // the java system classes, including StackOverflowError - depends on page
5072 // size. Add a page for compiler2 recursion in main thread.
5073 // Add in 2*BytesPerWord times page size to account for VM stack during
5074 // class initialization depending on 32 or 64 bit VM.
5075 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5076 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5077 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5078
5079 size_t threadStackSizeInBytes = ThreadStackSize * K;
5080 if (threadStackSizeInBytes != 0 &&
5081 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5082 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5083 os::Solaris::min_stack_allowed/K);
5084 return JNI_ERR;
5085 }
5086
5087 // For 64kbps there will be a 64kb page size, which makes
5088 // the usable default stack size quite a bit less. Increase the
5089 // stack for 64kb (or any > than 8kb) pages, this increases
5090 // virtual memory fragmentation (since we're not creating the
5091 // stack on a power of 2 boundary. The real fix for this
5092 // should be to fix the guard page mechanism.
5093
5094 if (vm_page_size() > 8*K) {
5095 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5096 ? threadStackSizeInBytes +
5097 ((StackYellowPages + StackRedPages) * vm_page_size())
5098 : 0;
5099 ThreadStackSize = threadStackSizeInBytes/K;
5100 }
5101
5102 // Make the stack size a multiple of the page size so that
5103 // the yellow/red zones can be guarded.
5104 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5105 vm_page_size()));
5106
5107 Solaris::libthread_init();
5108
5109 if (UseNUMA) {
5110 if (!Solaris::liblgrp_init()) {
5111 UseNUMA = false;
5112 } else {
5113 size_t lgrp_limit = os::numa_get_groups_num();
5114 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5115 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5116 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5117 if (lgrp_num < 2) {
5118 // There's only one locality group, disable NUMA.
5119 UseNUMA = false;
5120 }
5121 }
5122 if (!UseNUMA && ForceNUMA) {
5123 UseNUMA = true;
5124 }
5125 }
5126
5127 Solaris::signal_sets_init();
5128 Solaris::init_signal_mem();
5129 Solaris::install_signal_handlers();
5130
5131 if (libjsigversion < JSIG_VERSION_1_4_1) {
5132 Maxlibjsigsigs = OLDMAXSIGNUM;
5133 }
5134
5135 // initialize synchronization primitives to use either thread or
5136 // lwp synchronization (controlled by UseLWPSynchronization)
5137 Solaris::synchronization_init();
5138
5139 if (MaxFDLimit) {
5140 // set the number of file descriptors to max. print out error
5141 // if getrlimit/setrlimit fails but continue regardless.
5142 struct rlimit nbr_files;
5143 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5144 if (status != 0) {
5145 if (PrintMiscellaneous && (Verbose || WizardMode))
5146 perror("os::init_2 getrlimit failed");
5147 } else {
5148 nbr_files.rlim_cur = nbr_files.rlim_max;
5149 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5150 if (status != 0) {
5151 if (PrintMiscellaneous && (Verbose || WizardMode))
5152 perror("os::init_2 setrlimit failed");
5153 }
5154 }
5155 }
5156
5157 // Calculate theoretical max. size of Threads to guard gainst
5158 // artifical out-of-memory situations, where all available address-
5159 // space has been reserved by thread stacks. Default stack size is 1Mb.
5160 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5161 JavaThread::stack_size_at_create() : (1*K*K);
5162 assert(pre_thread_stack_size != 0, "Must have a stack");
5163 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5164 // we should start doing Virtual Memory banging. Currently when the threads will
5165 // have used all but 200Mb of space.
5166 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5167 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5168
5169 // at-exit methods are called in the reverse order of their registration.
5170 // In Solaris 7 and earlier, atexit functions are called on return from
5171 // main or as a result of a call to exit(3C). There can be only 32 of
5172 // these functions registered and atexit() does not set errno. In Solaris
5173 // 8 and later, there is no limit to the number of functions registered
5174 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5175 // functions are called upon dlclose(3DL) in addition to return from main
5176 // and exit(3C).
5177
5178 if (PerfAllowAtExitRegistration) {
5179 // only register atexit functions if PerfAllowAtExitRegistration is set.
5180 // atexit functions can be delayed until process exit time, which
5181 // can be problematic for embedded VM situations. Embedded VMs should
5182 // call DestroyJavaVM() to assure that VM resources are released.
5183
5184 // note: perfMemory_exit_helper atexit function may be removed in
5185 // the future if the appropriate cleanup code can be added to the
5186 // VM_Exit VMOperation's doit method.
5187 if (atexit(perfMemory_exit_helper) != 0) {
5188 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5189 }
5190 }
5191
5192 // Init pset_loadavg function pointer
5193 init_pset_getloadavg_ptr();
5194
5195 return JNI_OK;
5196 }
5197
5198 void os::init_3(void) {
5199 return;
5200 }
5201
5202 // Mark the polling page as unreadable
5203 void os::make_polling_page_unreadable(void) {
5204 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5205 fatal("Could not disable polling page");
5206 };
5207
5208 // Mark the polling page as readable
5209 void os::make_polling_page_readable(void) {
5210 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5211 fatal("Could not enable polling page");
5212 };
5213
5214 // OS interface.
5215
5216 bool os::check_heap(bool force) { return true; }
5217
5218 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5219 static vsnprintf_t sol_vsnprintf = NULL;
5220
5221 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5222 if (!sol_vsnprintf) {
5223 //search for the named symbol in the objects that were loaded after libjvm
5224 void* where = RTLD_NEXT;
5225 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5226 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5227 if (!sol_vsnprintf){
5228 //search for the named symbol in the objects that were loaded before libjvm
5229 where = RTLD_DEFAULT;
5230 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5231 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5232 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5233 }
5234 }
5235 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5236 }
5237
5238
5239 // Is a (classpath) directory empty?
5240 bool os::dir_is_empty(const char* path) {
5241 DIR *dir = NULL;
5242 struct dirent *ptr;
5243
5244 dir = opendir(path);
5245 if (dir == NULL) return true;
5246
5247 /* Scan the directory */
5248 bool result = true;
5249 char buf[sizeof(struct dirent) + MAX_PATH];
5250 struct dirent *dbuf = (struct dirent *) buf;
5251 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5252 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5253 result = false;
5254 }
5255 }
5256 closedir(dir);
5257 return result;
5258 }
5259
5260 // This code originates from JDK's sysOpen and open64_w
5261 // from src/solaris/hpi/src/system_md.c
5262
5263 #ifndef O_DELETE
5264 #define O_DELETE 0x10000
5265 #endif
5266
5267 // Open a file. Unlink the file immediately after open returns
5268 // if the specified oflag has the O_DELETE flag set.
5269 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5270
5271 int os::open(const char *path, int oflag, int mode) {
5272 if (strlen(path) > MAX_PATH - 1) {
5273 errno = ENAMETOOLONG;
5274 return -1;
5275 }
5276 int fd;
5277 int o_delete = (oflag & O_DELETE);
5278 oflag = oflag & ~O_DELETE;
5279
5280 fd = ::open64(path, oflag, mode);
5281 if (fd == -1) return -1;
5282
5283 //If the open succeeded, the file might still be a directory
5284 {
5285 struct stat64 buf64;
5286 int ret = ::fstat64(fd, &buf64);
5287 int st_mode = buf64.st_mode;
5288
5289 if (ret != -1) {
5290 if ((st_mode & S_IFMT) == S_IFDIR) {
5291 errno = EISDIR;
5292 ::close(fd);
5293 return -1;
5294 }
5295 } else {
5296 ::close(fd);
5297 return -1;
5298 }
5299 }
5300 /*
5301 * 32-bit Solaris systems suffer from:
5302 *
5303 * - an historical default soft limit of 256 per-process file
5304 * descriptors that is too low for many Java programs.
5305 *
5306 * - a design flaw where file descriptors created using stdio
5307 * fopen must be less than 256, _even_ when the first limit above
5308 * has been raised. This can cause calls to fopen (but not calls to
5309 * open, for example) to fail mysteriously, perhaps in 3rd party
5310 * native code (although the JDK itself uses fopen). One can hardly
5311 * criticize them for using this most standard of all functions.
5312 *
5313 * We attempt to make everything work anyways by:
5314 *
5315 * - raising the soft limit on per-process file descriptors beyond
5316 * 256
5317 *
5318 * - As of Solaris 10u4, we can request that Solaris raise the 256
5319 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5320 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5321 *
5322 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5323 * workaround the bug by remapping non-stdio file descriptors below
5324 * 256 to ones beyond 256, which is done below.
5325 *
5326 * See:
5327 * 1085341: 32-bit stdio routines should support file descriptors >255
5328 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5329 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5330 * enable_extended_FILE_stdio() in VM initialisation
5331 * Giri Mandalika's blog
5332 * http://technopark02.blogspot.com/2005_05_01_archive.html
5333 */
5334 #ifndef _LP64
5335 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5336 int newfd = ::fcntl(fd, F_DUPFD, 256);
5337 if (newfd != -1) {
5338 ::close(fd);
5339 fd = newfd;
5340 }
5341 }
5342 #endif // 32-bit Solaris
5343 /*
5344 * All file descriptors that are opened in the JVM and not
5345 * specifically destined for a subprocess should have the
5346 * close-on-exec flag set. If we don't set it, then careless 3rd
5347 * party native code might fork and exec without closing all
5348 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5349 * UNIXProcess.c), and this in turn might:
5350 *
5351 * - cause end-of-file to fail to be detected on some file
5352 * descriptors, resulting in mysterious hangs, or
5353 *
5354 * - might cause an fopen in the subprocess to fail on a system
5355 * suffering from bug 1085341.
5356 *
5357 * (Yes, the default setting of the close-on-exec flag is a Unix
5358 * design flaw)
5359 *
5360 * See:
5361 * 1085341: 32-bit stdio routines should support file descriptors >255
5362 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5363 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5364 */
5365 #ifdef FD_CLOEXEC
5366 {
5367 int flags = ::fcntl(fd, F_GETFD);
5368 if (flags != -1)
5369 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5370 }
5371 #endif
5372
5373 if (o_delete != 0) {
5374 ::unlink(path);
5375 }
5376 return fd;
5377 }
5378
5379 // create binary file, rewriting existing file if required
5380 int os::create_binary_file(const char* path, bool rewrite_existing) {
5381 int oflags = O_WRONLY | O_CREAT;
5382 if (!rewrite_existing) {
5383 oflags |= O_EXCL;
5384 }
5385 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5386 }
5387
5388 // return current position of file pointer
5389 jlong os::current_file_offset(int fd) {
5390 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5391 }
5392
5393 // move file pointer to the specified offset
5394 jlong os::seek_to_file_offset(int fd, jlong offset) {
5395 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5396 }
5397
5398 jlong os::lseek(int fd, jlong offset, int whence) {
5399 return (jlong) ::lseek64(fd, offset, whence);
5400 }
5401
5402 char * os::native_path(char *path) {
5403 return path;
5404 }
5405
5406 int os::ftruncate(int fd, jlong length) {
5407 return ::ftruncate64(fd, length);
5408 }
5409
5410 int os::fsync(int fd) {
5411 RESTARTABLE_RETURN_INT(::fsync(fd));
5412 }
5413
5414 int os::available(int fd, jlong *bytes) {
5415 jlong cur, end;
5416 int mode;
5417 struct stat64 buf64;
5418
5419 if (::fstat64(fd, &buf64) >= 0) {
5420 mode = buf64.st_mode;
5421 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5422 /*
5423 * XXX: is the following call interruptible? If so, this might
5424 * need to go through the INTERRUPT_IO() wrapper as for other
5425 * blocking, interruptible calls in this file.
5426 */
5427 int n,ioctl_return;
5428
5429 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5430 if (ioctl_return>= 0) {
5431 *bytes = n;
5432 return 1;
5433 }
5434 }
5435 }
5436 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5437 return 0;
5438 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5439 return 0;
5440 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5441 return 0;
5442 }
5443 *bytes = end - cur;
5444 return 1;
5445 }
5446
5447 // Map a block of memory.
5448 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5449 char *addr, size_t bytes, bool read_only,
5450 bool allow_exec) {
5451 int prot;
5452 int flags;
5453
5454 if (read_only) {
5455 prot = PROT_READ;
5456 flags = MAP_SHARED;
5457 } else {
5458 prot = PROT_READ | PROT_WRITE;
5459 flags = MAP_PRIVATE;
5460 }
5461
5462 if (allow_exec) {
5463 prot |= PROT_EXEC;
5464 }
5465
5466 if (addr != NULL) {
5467 flags |= MAP_FIXED;
5468 }
5469
5470 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5471 fd, file_offset);
5472 if (mapped_address == MAP_FAILED) {
5473 return NULL;
5474 }
5475 return mapped_address;
5476 }
5477
5478
5479 // Remap a block of memory.
5480 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5481 char *addr, size_t bytes, bool read_only,
5482 bool allow_exec) {
5483 // same as map_memory() on this OS
5484 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5485 allow_exec);
5486 }
5487
5488
5489 // Unmap a block of memory.
5490 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5491 return munmap(addr, bytes) == 0;
5492 }
5493
5494 void os::pause() {
5495 char filename[MAX_PATH];
5496 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5497 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5498 } else {
5499 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5500 }
5501
5502 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5503 if (fd != -1) {
5504 struct stat buf;
5505 ::close(fd);
5506 while (::stat(filename, &buf) == 0) {
5507 (void)::poll(NULL, 0, 100);
5508 }
5509 } else {
5510 jio_fprintf(stderr,
5511 "Could not open pause file '%s', continuing immediately.\n", filename);
5512 }
5513 }
5514
5515 #ifndef PRODUCT
5516 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5517 // Turn this on if you need to trace synch operations.
5518 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5519 // and call record_synch_enable and record_synch_disable
5520 // around the computation of interest.
5521
5522 void record_synch(char* name, bool returning); // defined below
5523
5524 class RecordSynch {
5525 char* _name;
5526 public:
5527 RecordSynch(char* name) :_name(name)
5528 { record_synch(_name, false); }
5529 ~RecordSynch() { record_synch(_name, true); }
5530 };
5531
5532 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5533 extern "C" ret name params { \
5534 typedef ret name##_t params; \
5535 static name##_t* implem = NULL; \
5536 static int callcount = 0; \
5537 if (implem == NULL) { \
5538 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5539 if (implem == NULL) fatal(dlerror()); \
5540 } \
5541 ++callcount; \
5542 RecordSynch _rs(#name); \
5543 inner; \
5544 return implem args; \
5545 }
5546 // in dbx, examine callcounts this way:
5547 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5548
5549 #define CHECK_POINTER_OK(p) \
5550 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5551 #define CHECK_MU \
5552 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5553 #define CHECK_CV \
5554 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5555 #define CHECK_P(p) \
5556 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5557
5558 #define CHECK_MUTEX(mutex_op) \
5559 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5560
5561 CHECK_MUTEX( mutex_lock)
5562 CHECK_MUTEX( _mutex_lock)
5563 CHECK_MUTEX( mutex_unlock)
5564 CHECK_MUTEX(_mutex_unlock)
5565 CHECK_MUTEX( mutex_trylock)
5566 CHECK_MUTEX(_mutex_trylock)
5567
5568 #define CHECK_COND(cond_op) \
5569 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5570
5571 CHECK_COND( cond_wait);
5572 CHECK_COND(_cond_wait);
5573 CHECK_COND(_cond_wait_cancel);
5574
5575 #define CHECK_COND2(cond_op) \
5576 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5577
5578 CHECK_COND2( cond_timedwait);
5579 CHECK_COND2(_cond_timedwait);
5580 CHECK_COND2(_cond_timedwait_cancel);
5581
5582 // do the _lwp_* versions too
5583 #define mutex_t lwp_mutex_t
5584 #define cond_t lwp_cond_t
5585 CHECK_MUTEX( _lwp_mutex_lock)
5586 CHECK_MUTEX( _lwp_mutex_unlock)
5587 CHECK_MUTEX( _lwp_mutex_trylock)
5588 CHECK_MUTEX( __lwp_mutex_lock)
5589 CHECK_MUTEX( __lwp_mutex_unlock)
5590 CHECK_MUTEX( __lwp_mutex_trylock)
5591 CHECK_MUTEX(___lwp_mutex_lock)
5592 CHECK_MUTEX(___lwp_mutex_unlock)
5593
5594 CHECK_COND( _lwp_cond_wait);
5595 CHECK_COND( __lwp_cond_wait);
5596 CHECK_COND(___lwp_cond_wait);
5597
5598 CHECK_COND2( _lwp_cond_timedwait);
5599 CHECK_COND2( __lwp_cond_timedwait);
5600 #undef mutex_t
5601 #undef cond_t
5602
5603 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5604 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5605 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5606 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5607 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5608 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5609 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5610 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5611
5612
5613 // recording machinery:
5614
5615 enum { RECORD_SYNCH_LIMIT = 200 };
5616 char* record_synch_name[RECORD_SYNCH_LIMIT];
5617 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5618 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5619 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5620 int record_synch_count = 0;
5621 bool record_synch_enabled = false;
5622
5623 // in dbx, examine recorded data this way:
5624 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5625
5626 void record_synch(char* name, bool returning) {
5627 if (record_synch_enabled) {
5628 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5629 record_synch_name[record_synch_count] = name;
5630 record_synch_returning[record_synch_count] = returning;
5631 record_synch_thread[record_synch_count] = thr_self();
5632 record_synch_arg0ptr[record_synch_count] = &name;
5633 record_synch_count++;
5634 }
5635 // put more checking code here:
5636 // ...
5637 }
5638 }
5639
5640 void record_synch_enable() {
5641 // start collecting trace data, if not already doing so
5642 if (!record_synch_enabled) record_synch_count = 0;
5643 record_synch_enabled = true;
5644 }
5645
5646 void record_synch_disable() {
5647 // stop collecting trace data
5648 record_synch_enabled = false;
5649 }
5650
5651 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5652 #endif // PRODUCT
5653
5654 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5655 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5656 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5657
5658
5659 // JVMTI & JVM monitoring and management support
5660 // The thread_cpu_time() and current_thread_cpu_time() are only
5661 // supported if is_thread_cpu_time_supported() returns true.
5662 // They are not supported on Solaris T1.
5663
5664 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5665 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5666 // of a thread.
5667 //
5668 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5669 // returns the fast estimate available on the platform.
5670
5671 // hrtime_t gethrvtime() return value includes
5672 // user time but does not include system time
5673 jlong os::current_thread_cpu_time() {
5674 return (jlong) gethrvtime();
5675 }
5676
5677 jlong os::thread_cpu_time(Thread *thread) {
5678 // return user level CPU time only to be consistent with
5679 // what current_thread_cpu_time returns.
5680 // thread_cpu_time_info() must be changed if this changes
5681 return os::thread_cpu_time(thread, false /* user time only */);
5682 }
5683
5684 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5685 if (user_sys_cpu_time) {
5686 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5687 } else {
5688 return os::current_thread_cpu_time();
5689 }
5690 }
5691
5692 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5693 char proc_name[64];
5694 int count;
5695 prusage_t prusage;
5696 jlong lwp_time;
5697 int fd;
5698
5699 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5700 getpid(),
5701 thread->osthread()->lwp_id());
5702 fd = ::open(proc_name, O_RDONLY);
5703 if ( fd == -1 ) return -1;
5704
5705 do {
5706 count = ::pread(fd,
5707 (void *)&prusage.pr_utime,
5708 thr_time_size,
5709 thr_time_off);
5710 } while (count < 0 && errno == EINTR);
5711 ::close(fd);
5712 if ( count < 0 ) return -1;
5713
5714 if (user_sys_cpu_time) {
5715 // user + system CPU time
5716 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5717 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5718 (jlong)prusage.pr_stime.tv_nsec +
5719 (jlong)prusage.pr_utime.tv_nsec;
5720 } else {
5721 // user level CPU time only
5722 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5723 (jlong)prusage.pr_utime.tv_nsec;
5724 }
5725
5726 return(lwp_time);
5727 }
5728
5729 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5730 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5731 info_ptr->may_skip_backward = false; // elapsed time not wall time
5732 info_ptr->may_skip_forward = false; // elapsed time not wall time
5733 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5734 }
5735
5736 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5737 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5738 info_ptr->may_skip_backward = false; // elapsed time not wall time
5739 info_ptr->may_skip_forward = false; // elapsed time not wall time
5740 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5741 }
5742
5743 bool os::is_thread_cpu_time_supported() {
5744 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5745 return true;
5746 } else {
5747 return false;
5748 }
5749 }
5750
5751 // System loadavg support. Returns -1 if load average cannot be obtained.
5752 // Return the load average for our processor set if the primitive exists
5753 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5754 int os::loadavg(double loadavg[], int nelem) {
5755 if (pset_getloadavg_ptr != NULL) {
5756 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5757 } else {
5758 return ::getloadavg(loadavg, nelem);
5759 }
5760 }
5761
5762 //---------------------------------------------------------------------------------
5763
5764 bool os::find(address addr, outputStream* st) {
5765 Dl_info dlinfo;
5766 memset(&dlinfo, 0, sizeof(dlinfo));
5767 if (dladdr(addr, &dlinfo) != 0) {
5768 st->print(PTR_FORMAT ": ", addr);
5769 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5770 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5771 } else if (dlinfo.dli_fbase != NULL)
5772 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5773 else
5774 st->print("<absolute address>");
5775 if (dlinfo.dli_fname != NULL) {
5776 st->print(" in %s", dlinfo.dli_fname);
5777 }
5778 if (dlinfo.dli_fbase != NULL) {
5779 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5780 }
5781 st->cr();
5782
5783 if (Verbose) {
5784 // decode some bytes around the PC
5785 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5786 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5787 address lowest = (address) dlinfo.dli_sname;
5788 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5789 if (begin < lowest) begin = lowest;
5790 Dl_info dlinfo2;
5791 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5792 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5793 end = (address) dlinfo2.dli_saddr;
5794 Disassembler::decode(begin, end, st);
5795 }
5796 return true;
5797 }
5798 return false;
5799 }
5800
5801 // Following function has been added to support HotSparc's libjvm.so running
5802 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5803 // src/solaris/hpi/native_threads in the EVM codebase.
5804 //
5805 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5806 // libraries and should thus be removed. We will leave it behind for a while
5807 // until we no longer want to able to run on top of 1.3.0 Solaris production
5808 // JDK. See 4341971.
5809
5810 #define STACK_SLACK 0x800
5811
5812 extern "C" {
5813 intptr_t sysThreadAvailableStackWithSlack() {
5814 stack_t st;
5815 intptr_t retval, stack_top;
5816 retval = thr_stksegment(&st);
5817 assert(retval == 0, "incorrect return value from thr_stksegment");
5818 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5819 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5820 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5821 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5822 }
5823 }
5824
5825 // ObjectMonitor park-unpark infrastructure ...
5826 //
5827 // We implement Solaris and Linux PlatformEvents with the
5828 // obvious condvar-mutex-flag triple.
5829 // Another alternative that works quite well is pipes:
5830 // Each PlatformEvent consists of a pipe-pair.
5831 // The thread associated with the PlatformEvent
5832 // calls park(), which reads from the input end of the pipe.
5833 // Unpark() writes into the other end of the pipe.
5834 // The write-side of the pipe must be set NDELAY.
5835 // Unfortunately pipes consume a large # of handles.
5836 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5837 // Using pipes for the 1st few threads might be workable, however.
5838 //
5839 // park() is permitted to return spuriously.
5840 // Callers of park() should wrap the call to park() in
5841 // an appropriate loop. A litmus test for the correct
5842 // usage of park is the following: if park() were modified
5843 // to immediately return 0 your code should still work,
5844 // albeit degenerating to a spin loop.
5845 //
5846 // An interesting optimization for park() is to use a trylock()
5847 // to attempt to acquire the mutex. If the trylock() fails
5848 // then we know that a concurrent unpark() operation is in-progress.
5849 // in that case the park() code could simply set _count to 0
5850 // and return immediately. The subsequent park() operation *might*
5851 // return immediately. That's harmless as the caller of park() is
5852 // expected to loop. By using trylock() we will have avoided a
5853 // avoided a context switch caused by contention on the per-thread mutex.
5854 //
5855 // TODO-FIXME:
5856 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5857 // objectmonitor implementation.
5858 // 2. Collapse the JSR166 parker event, and the
5859 // objectmonitor ParkEvent into a single "Event" construct.
5860 // 3. In park() and unpark() add:
5861 // assert (Thread::current() == AssociatedWith).
5862 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5863 // 1-out-of-N park() operations will return immediately.
5864 //
5865 // _Event transitions in park()
5866 // -1 => -1 : illegal
5867 // 1 => 0 : pass - return immediately
5868 // 0 => -1 : block
5869 //
5870 // _Event serves as a restricted-range semaphore.
5871 //
5872 // Another possible encoding of _Event would be with
5873 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5874 //
5875 // TODO-FIXME: add DTRACE probes for:
5876 // 1. Tx parks
5877 // 2. Ty unparks Tx
5878 // 3. Tx resumes from park
5879
5880
5881 // value determined through experimentation
5882 #define ROUNDINGFIX 11
5883
5884 // utility to compute the abstime argument to timedwait.
5885 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5886
5887 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5888 // millis is the relative timeout time
5889 // abstime will be the absolute timeout time
5890 if (millis < 0) millis = 0;
5891 struct timeval now;
5892 int status = gettimeofday(&now, NULL);
5893 assert(status == 0, "gettimeofday");
5894 jlong seconds = millis / 1000;
5895 jlong max_wait_period;
5896
5897 if (UseLWPSynchronization) {
5898 // forward port of fix for 4275818 (not sleeping long enough)
5899 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5900 // _lwp_cond_timedwait() used a round_down algorithm rather
5901 // than a round_up. For millis less than our roundfactor
5902 // it rounded down to 0 which doesn't meet the spec.
5903 // For millis > roundfactor we may return a bit sooner, but
5904 // since we can not accurately identify the patch level and
5905 // this has already been fixed in Solaris 9 and 8 we will
5906 // leave it alone rather than always rounding down.
5907
5908 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5909 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5910 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5911 max_wait_period = 21000000;
5912 } else {
5913 max_wait_period = 50000000;
5914 }
5915 millis %= 1000;
5916 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5917 seconds = max_wait_period;
5918 }
5919 abstime->tv_sec = now.tv_sec + seconds;
5920 long usec = now.tv_usec + millis * 1000;
5921 if (usec >= 1000000) {
5922 abstime->tv_sec += 1;
5923 usec -= 1000000;
5924 }
5925 abstime->tv_nsec = usec * 1000;
5926 return abstime;
5927 }
5928
5929 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5930 // Conceptually TryPark() should be equivalent to park(0).
5931
5932 int os::PlatformEvent::TryPark() {
5933 for (;;) {
5934 const int v = _Event ;
5935 guarantee ((v == 0) || (v == 1), "invariant") ;
5936 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5937 }
5938 }
5939
5940 void os::PlatformEvent::park() { // AKA: down()
5941 // Invariant: Only the thread associated with the Event/PlatformEvent
5942 // may call park().
5943 int v ;
5944 for (;;) {
5945 v = _Event ;
5946 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5947 }
5948 guarantee (v >= 0, "invariant") ;
5949 if (v == 0) {
5950 // Do this the hard way by blocking ...
5951 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5952 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5953 // Only for SPARC >= V8PlusA
5954 #if defined(__sparc) && defined(COMPILER2)
5955 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5956 #endif
5957 int status = os::Solaris::mutex_lock(_mutex);
5958 assert_status(status == 0, status, "mutex_lock");
5959 guarantee (_nParked == 0, "invariant") ;
5960 ++ _nParked ;
5961 while (_Event < 0) {
5962 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5963 // Treat this the same as if the wait was interrupted
5964 // With usr/lib/lwp going to kernel, always handle ETIME
5965 status = os::Solaris::cond_wait(_cond, _mutex);
5966 if (status == ETIME) status = EINTR ;
5967 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5968 }
5969 -- _nParked ;
5970 _Event = 0 ;
5971 status = os::Solaris::mutex_unlock(_mutex);
5972 assert_status(status == 0, status, "mutex_unlock");
5973 // Paranoia to ensure our locked and lock-free paths interact
5974 // correctly with each other.
5975 OrderAccess::fence();
5976 }
5977 }
5978
5979 int os::PlatformEvent::park(jlong millis) {
5980 guarantee (_nParked == 0, "invariant") ;
5981 int v ;
5982 for (;;) {
5983 v = _Event ;
5984 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5985 }
5986 guarantee (v >= 0, "invariant") ;
5987 if (v != 0) return OS_OK ;
5988
5989 int ret = OS_TIMEOUT;
5990 timestruc_t abst;
5991 compute_abstime (&abst, millis);
5992
5993 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5994 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5995 // Only for SPARC >= V8PlusA
5996 #if defined(__sparc) && defined(COMPILER2)
5997 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5998 #endif
5999 int status = os::Solaris::mutex_lock(_mutex);
6000 assert_status(status == 0, status, "mutex_lock");
6001 guarantee (_nParked == 0, "invariant") ;
6002 ++ _nParked ;
6003 while (_Event < 0) {
6004 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
6005 assert_status(status == 0 || status == EINTR ||
6006 status == ETIME || status == ETIMEDOUT,
6007 status, "cond_timedwait");
6008 if (!FilterSpuriousWakeups) break ; // previous semantics
6009 if (status == ETIME || status == ETIMEDOUT) break ;
6010 // We consume and ignore EINTR and spurious wakeups.
6011 }
6012 -- _nParked ;
6013 if (_Event >= 0) ret = OS_OK ;
6014 _Event = 0 ;
6015 status = os::Solaris::mutex_unlock(_mutex);
6016 assert_status(status == 0, status, "mutex_unlock");
6017 // Paranoia to ensure our locked and lock-free paths interact
6018 // correctly with each other.
6019 OrderAccess::fence();
6020 return ret;
6021 }
6022
6023 void os::PlatformEvent::unpark() {
6024 // Transitions for _Event:
6025 // 0 :=> 1
6026 // 1 :=> 1
6027 // -1 :=> either 0 or 1; must signal target thread
6028 // That is, we can safely transition _Event from -1 to either
6029 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
6030 // unpark() calls.
6031 // See also: "Semaphores in Plan 9" by Mullender & Cox
6032 //
6033 // Note: Forcing a transition from "-1" to "1" on an unpark() means
6034 // that it will take two back-to-back park() calls for the owning
6035 // thread to block. This has the benefit of forcing a spurious return
6036 // from the first park() call after an unpark() call which will help
6037 // shake out uses of park() and unpark() without condition variables.
6038
6039 if (Atomic::xchg(1, &_Event) >= 0) return;
6040
6041 // If the thread associated with the event was parked, wake it.
6042 // Wait for the thread assoc with the PlatformEvent to vacate.
6043 int status = os::Solaris::mutex_lock(_mutex);
6044 assert_status(status == 0, status, "mutex_lock");
6045 int AnyWaiters = _nParked;
6046 status = os::Solaris::mutex_unlock(_mutex);
6047 assert_status(status == 0, status, "mutex_unlock");
6048 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
6049 if (AnyWaiters != 0) {
6050 // We intentional signal *after* dropping the lock
6051 // to avoid a common class of futile wakeups.
6052 status = os::Solaris::cond_signal(_cond);
6053 assert_status(status == 0, status, "cond_signal");
6054 }
6055 }
6056
6057 // JSR166
6058 // -------------------------------------------------------
6059
6060 /*
6061 * The solaris and linux implementations of park/unpark are fairly
6062 * conservative for now, but can be improved. They currently use a
6063 * mutex/condvar pair, plus _counter.
6064 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6065 * sets count to 1 and signals condvar. Only one thread ever waits
6066 * on the condvar. Contention seen when trying to park implies that someone
6067 * is unparking you, so don't wait. And spurious returns are fine, so there
6068 * is no need to track notifications.
6069 */
6070
6071 #define MAX_SECS 100000000
6072 /*
6073 * This code is common to linux and solaris and will be moved to a
6074 * common place in dolphin.
6075 *
6076 * The passed in time value is either a relative time in nanoseconds
6077 * or an absolute time in milliseconds. Either way it has to be unpacked
6078 * into suitable seconds and nanoseconds components and stored in the
6079 * given timespec structure.
6080 * Given time is a 64-bit value and the time_t used in the timespec is only
6081 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6082 * overflow if times way in the future are given. Further on Solaris versions
6083 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6084 * number of seconds, in abstime, is less than current_time + 100,000,000.
6085 * As it will be 28 years before "now + 100000000" will overflow we can
6086 * ignore overflow and just impose a hard-limit on seconds using the value
6087 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6088 * years from "now".
6089 */
6090 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6091 assert (time > 0, "convertTime");
6092
6093 struct timeval now;
6094 int status = gettimeofday(&now, NULL);
6095 assert(status == 0, "gettimeofday");
6096
6097 time_t max_secs = now.tv_sec + MAX_SECS;
6098
6099 if (isAbsolute) {
6100 jlong secs = time / 1000;
6101 if (secs > max_secs) {
6102 absTime->tv_sec = max_secs;
6103 }
6104 else {
6105 absTime->tv_sec = secs;
6106 }
6107 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6108 }
6109 else {
6110 jlong secs = time / NANOSECS_PER_SEC;
6111 if (secs >= MAX_SECS) {
6112 absTime->tv_sec = max_secs;
6113 absTime->tv_nsec = 0;
6114 }
6115 else {
6116 absTime->tv_sec = now.tv_sec + secs;
6117 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6118 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6119 absTime->tv_nsec -= NANOSECS_PER_SEC;
6120 ++absTime->tv_sec; // note: this must be <= max_secs
6121 }
6122 }
6123 }
6124 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6125 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6126 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6127 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6128 }
6129
6130 void Parker::park(bool isAbsolute, jlong time) {
6131 // Ideally we'd do something useful while spinning, such
6132 // as calling unpackTime().
6133
6134 // Optional fast-path check:
6135 // Return immediately if a permit is available.
6136 // We depend on Atomic::xchg() having full barrier semantics
6137 // since we are doing a lock-free update to _counter.
6138 if (Atomic::xchg(0, &_counter) > 0) return;
6139
6140 // Optional fast-exit: Check interrupt before trying to wait
6141 Thread* thread = Thread::current();
6142 assert(thread->is_Java_thread(), "Must be JavaThread");
6143 JavaThread *jt = (JavaThread *)thread;
6144 if (Thread::is_interrupted(thread, false)) {
6145 return;
6146 }
6147
6148 // First, demultiplex/decode time arguments
6149 timespec absTime;
6150 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6151 return;
6152 }
6153 if (time > 0) {
6154 // Warning: this code might be exposed to the old Solaris time
6155 // round-down bugs. Grep "roundingFix" for details.
6156 unpackTime(&absTime, isAbsolute, time);
6157 }
6158
6159 // Enter safepoint region
6160 // Beware of deadlocks such as 6317397.
6161 // The per-thread Parker:: _mutex is a classic leaf-lock.
6162 // In particular a thread must never block on the Threads_lock while
6163 // holding the Parker:: mutex. If safepoints are pending both the
6164 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6165 ThreadBlockInVM tbivm(jt);
6166
6167 // Don't wait if cannot get lock since interference arises from
6168 // unblocking. Also. check interrupt before trying wait
6169 if (Thread::is_interrupted(thread, false) ||
6170 os::Solaris::mutex_trylock(_mutex) != 0) {
6171 return;
6172 }
6173
6174 int status ;
6175
6176 if (_counter > 0) { // no wait needed
6177 _counter = 0;
6178 status = os::Solaris::mutex_unlock(_mutex);
6179 assert (status == 0, "invariant") ;
6180 // Paranoia to ensure our locked and lock-free paths interact
6181 // correctly with each other and Java-level accesses.
6182 OrderAccess::fence();
6183 return;
6184 }
6185
6186 #ifdef ASSERT
6187 // Don't catch signals while blocked; let the running threads have the signals.
6188 // (This allows a debugger to break into the running thread.)
6189 sigset_t oldsigs;
6190 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6191 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6192 #endif
6193
6194 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6195 jt->set_suspend_equivalent();
6196 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6197
6198 // Do this the hard way by blocking ...
6199 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6200 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6201 // Only for SPARC >= V8PlusA
6202 #if defined(__sparc) && defined(COMPILER2)
6203 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6204 #endif
6205
6206 if (time == 0) {
6207 status = os::Solaris::cond_wait (_cond, _mutex) ;
6208 } else {
6209 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6210 }
6211 // Note that an untimed cond_wait() can sometimes return ETIME on older
6212 // versions of the Solaris.
6213 assert_status(status == 0 || status == EINTR ||
6214 status == ETIME || status == ETIMEDOUT,
6215 status, "cond_timedwait");
6216
6217 #ifdef ASSERT
6218 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6219 #endif
6220 _counter = 0 ;
6221 status = os::Solaris::mutex_unlock(_mutex);
6222 assert_status(status == 0, status, "mutex_unlock") ;
6223 // Paranoia to ensure our locked and lock-free paths interact
6224 // correctly with each other and Java-level accesses.
6225 OrderAccess::fence();
6226
6227 // If externally suspended while waiting, re-suspend
6228 if (jt->handle_special_suspend_equivalent_condition()) {
6229 jt->java_suspend_self();
6230 }
6231 }
6232
6233 void Parker::unpark() {
6234 int s, status ;
6235 status = os::Solaris::mutex_lock (_mutex) ;
6236 assert (status == 0, "invariant") ;
6237 s = _counter;
6238 _counter = 1;
6239 status = os::Solaris::mutex_unlock (_mutex) ;
6240 assert (status == 0, "invariant") ;
6241
6242 if (s < 1) {
6243 status = os::Solaris::cond_signal (_cond) ;
6244 assert (status == 0, "invariant") ;
6245 }
6246 }
6247
6248 extern char** environ;
6249
6250 // Run the specified command in a separate process. Return its exit value,
6251 // or -1 on failure (e.g. can't fork a new process).
6252 // Unlike system(), this function can be called from signal handler. It
6253 // doesn't block SIGINT et al.
6254 int os::fork_and_exec(char* cmd) {
6255 char * argv[4];
6256 argv[0] = (char *)"sh";
6257 argv[1] = (char *)"-c";
6258 argv[2] = cmd;
6259 argv[3] = NULL;
6260
6261 // fork is async-safe, fork1 is not so can't use in signal handler
6262 pid_t pid;
6263 Thread* t = ThreadLocalStorage::get_thread_slow();
6264 if (t != NULL && t->is_inside_signal_handler()) {
6265 pid = fork();
6266 } else {
6267 pid = fork1();
6268 }
6269
6270 if (pid < 0) {
6271 // fork failed
6272 warning("fork failed: %s", strerror(errno));
6273 return -1;
6274
6275 } else if (pid == 0) {
6276 // child process
6277
6278 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6279 execve("/usr/bin/sh", argv, environ);
6280
6281 // execve failed
6282 _exit(-1);
6283
6284 } else {
6285 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6286 // care about the actual exit code, for now.
6287
6288 int status;
6289
6290 // Wait for the child process to exit. This returns immediately if
6291 // the child has already exited. */
6292 while (waitpid(pid, &status, 0) < 0) {
6293 switch (errno) {
6294 case ECHILD: return 0;
6295 case EINTR: break;
6296 default: return -1;
6297 }
6298 }
6299
6300 if (WIFEXITED(status)) {
6301 // The child exited normally; get its exit code.
6302 return WEXITSTATUS(status);
6303 } else if (WIFSIGNALED(status)) {
6304 // The child exited because of a signal
6305 // The best value to return is 0x80 + signal number,
6306 // because that is what all Unix shells do, and because
6307 // it allows callers to distinguish between process exit and
6308 // process death by signal.
6309 return 0x80 + WTERMSIG(status);
6310 } else {
6311 // Unknown exit code; pass it through
6312 return status;
6313 }
6314 }
6315 }
6316
6317 // is_headless_jre()
6318 //
6319 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6320 // in order to report if we are running in a headless jre
6321 //
6322 // Since JDK8 xawt/libmawt.so was moved into the same directory
6323 // as libawt.so, and renamed libawt_xawt.so
6324 //
6325 bool os::is_headless_jre() {
6326 struct stat statbuf;
6327 char buf[MAXPATHLEN];
6328 char libmawtpath[MAXPATHLEN];
6329 const char *xawtstr = "/xawt/libmawt.so";
6330 const char *new_xawtstr = "/libawt_xawt.so";
6331 char *p;
6332
6333 // Get path to libjvm.so
6334 os::jvm_path(buf, sizeof(buf));
6335
6336 // Get rid of libjvm.so
6337 p = strrchr(buf, '/');
6338 if (p == NULL) return false;
6339 else *p = '\0';
6340
6341 // Get rid of client or server
6342 p = strrchr(buf, '/');
6343 if (p == NULL) return false;
6344 else *p = '\0';
6345
6346 // check xawt/libmawt.so
6347 strcpy(libmawtpath, buf);
6348 strcat(libmawtpath, xawtstr);
6349 if (::stat(libmawtpath, &statbuf) == 0) return false;
6350
6351 // check libawt_xawt.so
6352 strcpy(libmawtpath, buf);
6353 strcat(libmawtpath, new_xawtstr);
6354 if (::stat(libmawtpath, &statbuf) == 0) return false;
6355
6356 return true;
6357 }
6358
6359 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6360 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6361 }
6362
6363 int os::close(int fd) {
6364 return ::close(fd);
6365 }
6366
6367 int os::socket_close(int fd) {
6368 return ::close(fd);
6369 }
6370
6371 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6372 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6373 }
6374
6375 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6376 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6377 }
6378
6379 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6380 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6381 }
6382
6383 // As both poll and select can be interrupted by signals, we have to be
6384 // prepared to restart the system call after updating the timeout, unless
6385 // a poll() is done with timeout == -1, in which case we repeat with this
6386 // "wait forever" value.
6387
6388 int os::timeout(int fd, long timeout) {
6389 int res;
6390 struct timeval t;
6391 julong prevtime, newtime;
6392 static const char* aNull = 0;
6393 struct pollfd pfd;
6394 pfd.fd = fd;
6395 pfd.events = POLLIN;
6396
6397 gettimeofday(&t, &aNull);
6398 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6399
6400 for(;;) {
6401 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6402 if(res == OS_ERR && errno == EINTR) {
6403 if(timeout != -1) {
6404 gettimeofday(&t, &aNull);
6405 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6406 timeout -= newtime - prevtime;
6407 if(timeout <= 0)
6408 return OS_OK;
6409 prevtime = newtime;
6410 }
6411 } else return res;
6412 }
6413 }
6414
6415 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6416 int _result;
6417 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6418 os::Solaris::clear_interrupted);
6419
6420 // Depending on when thread interruption is reset, _result could be
6421 // one of two values when errno == EINTR
6422
6423 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6424 && (errno == EINTR)) {
6425 /* restarting a connect() changes its errno semantics */
6426 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6427 os::Solaris::clear_interrupted);
6428 /* undo these changes */
6429 if (_result == OS_ERR) {
6430 if (errno == EALREADY) {
6431 errno = EINPROGRESS; /* fall through */
6432 } else if (errno == EISCONN) {
6433 errno = 0;
6434 return OS_OK;
6435 }
6436 }
6437 }
6438 return _result;
6439 }
6440
6441 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6442 if (fd < 0) {
6443 return OS_ERR;
6444 }
6445 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6446 os::Solaris::clear_interrupted);
6447 }
6448
6449 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6450 sockaddr* from, socklen_t* fromlen) {
6451 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6452 os::Solaris::clear_interrupted);
6453 }
6454
6455 int os::sendto(int fd, char* buf, size_t len, uint flags,
6456 struct sockaddr* to, socklen_t tolen) {
6457 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6458 os::Solaris::clear_interrupted);
6459 }
6460
6461 int os::socket_available(int fd, jint *pbytes) {
6462 if (fd < 0) {
6463 return OS_OK;
6464 }
6465 int ret;
6466 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6467 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6468 // is expected to return 0 on failure and 1 on success to the jdk.
6469 return (ret == OS_ERR) ? 0 : 1;
6470 }
6471
6472 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6473 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6474 os::Solaris::clear_interrupted);
6475 }
6476
6477 // Get the default path to the core file
6478 // Returns the length of the string
6479 int os::get_core_path(char* buffer, size_t bufferSize) {
6480 const char* p = get_current_directory(buffer, bufferSize);
6481
6482 if (p == NULL) {
6483 assert(p != NULL, "failed to get current directory");
6484 return 0;
6485 }
6486
6487 return strlen(buffer);
6488 }
6489
6490 #ifndef PRODUCT
6491 void TestReserveMemorySpecial_test() {
6492 // No tests available for this platform
6493 }
6494 #endif