1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/osThread.hpp"
52 #include "runtime/perfMemory.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/statSampler.hpp"
55 #include "runtime/stubRoutines.hpp"
56 #include "runtime/thread.inline.hpp"
57 #include "runtime/threadCritical.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/attachListener.hpp"
60 #include "services/memTracker.hpp"
61 #include "services/runtimeService.hpp"
62 #include "utilities/decoder.hpp"
63 #include "utilities/defaultStream.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/growableArray.hpp"
66 #include "utilities/vmError.hpp"
67
68 // put OS-includes here
69 # include <dlfcn.h>
70 # include <errno.h>
71 # include <exception>
72 # include <link.h>
73 # include <poll.h>
74 # include <pthread.h>
75 # include <pwd.h>
76 # include <schedctl.h>
77 # include <setjmp.h>
78 # include <signal.h>
79 # include <stdio.h>
80 # include <alloca.h>
81 # include <sys/filio.h>
82 # include <sys/ipc.h>
83 # include <sys/lwp.h>
84 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
85 # include <sys/mman.h>
86 # include <sys/processor.h>
87 # include <sys/procset.h>
88 # include <sys/pset.h>
89 # include <sys/resource.h>
90 # include <sys/shm.h>
91 # include <sys/socket.h>
92 # include <sys/stat.h>
93 # include <sys/systeminfo.h>
94 # include <sys/time.h>
95 # include <sys/times.h>
96 # include <sys/types.h>
97 # include <sys/wait.h>
98 # include <sys/utsname.h>
99 # include <thread.h>
100 # include <unistd.h>
101 # include <sys/priocntl.h>
102 # include <sys/rtpriocntl.h>
103 # include <sys/tspriocntl.h>
104 # include <sys/iapriocntl.h>
105 # include <sys/fxpriocntl.h>
106 # include <sys/loadavg.h>
107 # include <string.h>
108 # include <stdio.h>
109
110 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
111 # include <sys/procfs.h> // see comment in <sys/procfs.h>
112
113 #define MAX_PATH (2 * K)
114
115 // for timer info max values which include all bits
116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
117
118
119 // Here are some liblgrp types from sys/lgrp_user.h to be able to
120 // compile on older systems without this header file.
121
122 #ifndef MADV_ACCESS_LWP
123 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
124 #endif
125 #ifndef MADV_ACCESS_MANY
126 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
127 #endif
128
129 #ifndef LGRP_RSRC_CPU
130 # define LGRP_RSRC_CPU 0 /* CPU resources */
131 #endif
132 #ifndef LGRP_RSRC_MEM
133 # define LGRP_RSRC_MEM 1 /* memory resources */
134 #endif
135
136 // see thr_setprio(3T) for the basis of these numbers
137 #define MinimumPriority 0
138 #define NormalPriority 64
139 #define MaximumPriority 127
140
141 // Values for ThreadPriorityPolicy == 1
142 int prio_policy1[CriticalPriority+1] = {
143 -99999, 0, 16, 32, 48, 64,
144 80, 96, 112, 124, 127, 127 };
145
146 // System parameters used internally
147 static clock_t clock_tics_per_sec = 100;
148
149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
150 static bool enabled_extended_FILE_stdio = false;
151
152 // For diagnostics to print a message once. see run_periodic_checks
153 static bool check_addr0_done = false;
154 static sigset_t check_signal_done;
155 static bool check_signals = true;
156
157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
159
160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
161
162
163 // "default" initializers for missing libc APIs
164 extern "C" {
165 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
166 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
167
168 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
169 static int lwp_cond_destroy(cond_t *cv) { return 0; }
170 }
171
172 // "default" initializers for pthread-based synchronization
173 extern "C" {
174 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
175 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
176 }
177
178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
179
180 // Thread Local Storage
181 // This is common to all Solaris platforms so it is defined here,
182 // in this common file.
183 // The declarations are in the os_cpu threadLS*.hpp files.
184 //
185 // Static member initialization for TLS
186 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
187
188 #ifndef PRODUCT
189 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
190
191 int ThreadLocalStorage::_tcacheHit = 0;
192 int ThreadLocalStorage::_tcacheMiss = 0;
193
194 void ThreadLocalStorage::print_statistics() {
195 int total = _tcacheMiss+_tcacheHit;
196 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
197 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
198 }
199 #undef _PCT
200 #endif // PRODUCT
201
202 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
203 int index) {
204 Thread *thread = get_thread_slow();
205 if (thread != NULL) {
206 address sp = os::current_stack_pointer();
207 guarantee(thread->_stack_base == NULL ||
208 (sp <= thread->_stack_base &&
209 sp >= thread->_stack_base - thread->_stack_size) ||
210 is_error_reported(),
211 "sp must be inside of selected thread stack");
212
213 thread->set_self_raw_id(raw_id); // mark for quick retrieval
214 _get_thread_cache[ index ] = thread;
215 }
216 return thread;
217 }
218
219
220 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
221 #define NO_CACHED_THREAD ((Thread*)all_zero)
222
223 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
224
225 // Store the new value before updating the cache to prevent a race
226 // between get_thread_via_cache_slowly() and this store operation.
227 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
228
229 // Update thread cache with new thread if setting on thread create,
230 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
231 uintptr_t raw = pd_raw_thread_id();
232 int ix = pd_cache_index(raw);
233 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
234 }
235
236 void ThreadLocalStorage::pd_init() {
237 for (int i = 0; i < _pd_cache_size; i++) {
238 _get_thread_cache[i] = NO_CACHED_THREAD;
239 }
240 }
241
242 // Invalidate all the caches (happens to be the same as pd_init).
243 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
244
245 #undef NO_CACHED_THREAD
246
247 // END Thread Local Storage
248
249 static inline size_t adjust_stack_size(address base, size_t size) {
250 if ((ssize_t)size < 0) {
251 // 4759953: Compensate for ridiculous stack size.
252 size = max_intx;
253 }
254 if (size > (size_t)base) {
255 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
256 size = (size_t)base;
257 }
258 return size;
259 }
260
261 static inline stack_t get_stack_info() {
262 stack_t st;
263 int retval = thr_stksegment(&st);
264 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
265 assert(retval == 0, "incorrect return value from thr_stksegment");
266 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
267 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
268 return st;
269 }
270
271 address os::current_stack_base() {
272 int r = thr_main() ;
273 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
274 bool is_primordial_thread = r;
275
276 // Workaround 4352906, avoid calls to thr_stksegment by
277 // thr_main after the first one (it looks like we trash
278 // some data, causing the value for ss_sp to be incorrect).
279 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
280 stack_t st = get_stack_info();
281 if (is_primordial_thread) {
282 // cache initial value of stack base
283 os::Solaris::_main_stack_base = (address)st.ss_sp;
284 }
285 return (address)st.ss_sp;
286 } else {
287 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
288 return os::Solaris::_main_stack_base;
289 }
290 }
291
292 size_t os::current_stack_size() {
293 size_t size;
294
295 int r = thr_main() ;
296 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
297 if(!r) {
298 size = get_stack_info().ss_size;
299 } else {
300 struct rlimit limits;
301 getrlimit(RLIMIT_STACK, &limits);
302 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
303 }
304 // base may not be page aligned
305 address base = current_stack_base();
306 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
307 return (size_t)(base - bottom);
308 }
309
310 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
311 return localtime_r(clock, res);
312 }
313
314 // interruptible infrastructure
315
316 // setup_interruptible saves the thread state before going into an
317 // interruptible system call.
318 // The saved state is used to restore the thread to
319 // its former state whether or not an interrupt is received.
320 // Used by classloader os::read
321 // os::restartable_read calls skip this layer and stay in _thread_in_native
322
323 void os::Solaris::setup_interruptible(JavaThread* thread) {
324
325 JavaThreadState thread_state = thread->thread_state();
326
327 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
328 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
329 OSThread* osthread = thread->osthread();
330 osthread->set_saved_interrupt_thread_state(thread_state);
331 thread->frame_anchor()->make_walkable(thread);
332 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
333 }
334
335 // Version of setup_interruptible() for threads that are already in
336 // _thread_blocked. Used by os_sleep().
337 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
338 thread->frame_anchor()->make_walkable(thread);
339 }
340
341 JavaThread* os::Solaris::setup_interruptible() {
342 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
343 setup_interruptible(thread);
344 return thread;
345 }
346
347 void os::Solaris::try_enable_extended_io() {
348 typedef int (*enable_extended_FILE_stdio_t)(int, int);
349
350 if (!UseExtendedFileIO) {
351 return;
352 }
353
354 enable_extended_FILE_stdio_t enabler =
355 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
356 "enable_extended_FILE_stdio");
357 if (enabler) {
358 enabler(-1, -1);
359 }
360 }
361
362
363 #ifdef ASSERT
364
365 JavaThread* os::Solaris::setup_interruptible_native() {
366 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
367 JavaThreadState thread_state = thread->thread_state();
368 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
369 return thread;
370 }
371
372 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
373 JavaThreadState thread_state = thread->thread_state();
374 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
375 }
376 #endif
377
378 // cleanup_interruptible reverses the effects of setup_interruptible
379 // setup_interruptible_already_blocked() does not need any cleanup.
380
381 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
382 OSThread* osthread = thread->osthread();
383
384 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
385 }
386
387 // I/O interruption related counters called in _INTERRUPTIBLE
388
389 void os::Solaris::bump_interrupted_before_count() {
390 RuntimeService::record_interrupted_before_count();
391 }
392
393 void os::Solaris::bump_interrupted_during_count() {
394 RuntimeService::record_interrupted_during_count();
395 }
396
397 static int _processors_online = 0;
398
399 jint os::Solaris::_os_thread_limit = 0;
400 volatile jint os::Solaris::_os_thread_count = 0;
401
402 julong os::available_memory() {
403 return Solaris::available_memory();
404 }
405
406 julong os::Solaris::available_memory() {
407 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
408 }
409
410 julong os::Solaris::_physical_memory = 0;
411
412 julong os::physical_memory() {
413 return Solaris::physical_memory();
414 }
415
416 static hrtime_t first_hrtime = 0;
417 static const hrtime_t hrtime_hz = 1000*1000*1000;
418 const int LOCK_BUSY = 1;
419 const int LOCK_FREE = 0;
420 const int LOCK_INVALID = -1;
421 static volatile hrtime_t max_hrtime = 0;
422 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress
423
424
425 void os::Solaris::initialize_system_info() {
426 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
427 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
428 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
429 }
430
431 int os::active_processor_count() {
432 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
433 pid_t pid = getpid();
434 psetid_t pset = PS_NONE;
435 // Are we running in a processor set or is there any processor set around?
436 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
437 uint_t pset_cpus;
438 // Query the number of cpus available to us.
439 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
440 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
441 _processors_online = pset_cpus;
442 return pset_cpus;
443 }
444 }
445 // Otherwise return number of online cpus
446 return online_cpus;
447 }
448
449 static bool find_processors_in_pset(psetid_t pset,
450 processorid_t** id_array,
451 uint_t* id_length) {
452 bool result = false;
453 // Find the number of processors in the processor set.
454 if (pset_info(pset, NULL, id_length, NULL) == 0) {
455 // Make up an array to hold their ids.
456 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
457 // Fill in the array with their processor ids.
458 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
459 result = true;
460 }
461 }
462 return result;
463 }
464
465 // Callers of find_processors_online() must tolerate imprecise results --
466 // the system configuration can change asynchronously because of DR
467 // or explicit psradm operations.
468 //
469 // We also need to take care that the loop (below) terminates as the
470 // number of processors online can change between the _SC_NPROCESSORS_ONLN
471 // request and the loop that builds the list of processor ids. Unfortunately
472 // there's no reliable way to determine the maximum valid processor id,
473 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
474 // man pages, which claim the processor id set is "sparse, but
475 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
476 // exit the loop.
477 //
478 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
479 // not available on S8.0.
480
481 static bool find_processors_online(processorid_t** id_array,
482 uint* id_length) {
483 const processorid_t MAX_PROCESSOR_ID = 100000 ;
484 // Find the number of processors online.
485 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
486 // Make up an array to hold their ids.
487 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
488 // Processors need not be numbered consecutively.
489 long found = 0;
490 processorid_t next = 0;
491 while (found < *id_length && next < MAX_PROCESSOR_ID) {
492 processor_info_t info;
493 if (processor_info(next, &info) == 0) {
494 // NB, PI_NOINTR processors are effectively online ...
495 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
496 (*id_array)[found] = next;
497 found += 1;
498 }
499 }
500 next += 1;
501 }
502 if (found < *id_length) {
503 // The loop above didn't identify the expected number of processors.
504 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
505 // and re-running the loop, above, but there's no guarantee of progress
506 // if the system configuration is in flux. Instead, we just return what
507 // we've got. Note that in the worst case find_processors_online() could
508 // return an empty set. (As a fall-back in the case of the empty set we
509 // could just return the ID of the current processor).
510 *id_length = found ;
511 }
512
513 return true;
514 }
515
516 static bool assign_distribution(processorid_t* id_array,
517 uint id_length,
518 uint* distribution,
519 uint distribution_length) {
520 // We assume we can assign processorid_t's to uint's.
521 assert(sizeof(processorid_t) == sizeof(uint),
522 "can't convert processorid_t to uint");
523 // Quick check to see if we won't succeed.
524 if (id_length < distribution_length) {
525 return false;
526 }
527 // Assign processor ids to the distribution.
528 // Try to shuffle processors to distribute work across boards,
529 // assuming 4 processors per board.
530 const uint processors_per_board = ProcessDistributionStride;
531 // Find the maximum processor id.
532 processorid_t max_id = 0;
533 for (uint m = 0; m < id_length; m += 1) {
534 max_id = MAX2(max_id, id_array[m]);
535 }
536 // The next id, to limit loops.
537 const processorid_t limit_id = max_id + 1;
538 // Make up markers for available processors.
539 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
540 for (uint c = 0; c < limit_id; c += 1) {
541 available_id[c] = false;
542 }
543 for (uint a = 0; a < id_length; a += 1) {
544 available_id[id_array[a]] = true;
545 }
546 // Step by "boards", then by "slot", copying to "assigned".
547 // NEEDS_CLEANUP: The assignment of processors should be stateful,
548 // remembering which processors have been assigned by
549 // previous calls, etc., so as to distribute several
550 // independent calls of this method. What we'd like is
551 // It would be nice to have an API that let us ask
552 // how many processes are bound to a processor,
553 // but we don't have that, either.
554 // In the short term, "board" is static so that
555 // subsequent distributions don't all start at board 0.
556 static uint board = 0;
557 uint assigned = 0;
558 // Until we've found enough processors ....
559 while (assigned < distribution_length) {
560 // ... find the next available processor in the board.
561 for (uint slot = 0; slot < processors_per_board; slot += 1) {
562 uint try_id = board * processors_per_board + slot;
563 if ((try_id < limit_id) && (available_id[try_id] == true)) {
564 distribution[assigned] = try_id;
565 available_id[try_id] = false;
566 assigned += 1;
567 break;
568 }
569 }
570 board += 1;
571 if (board * processors_per_board + 0 >= limit_id) {
572 board = 0;
573 }
574 }
575 if (available_id != NULL) {
576 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
577 }
578 return true;
579 }
580
581 void os::set_native_thread_name(const char *name) {
582 // Not yet implemented.
583 return;
584 }
585
586 bool os::distribute_processes(uint length, uint* distribution) {
587 bool result = false;
588 // Find the processor id's of all the available CPUs.
589 processorid_t* id_array = NULL;
590 uint id_length = 0;
591 // There are some races between querying information and using it,
592 // since processor sets can change dynamically.
593 psetid_t pset = PS_NONE;
594 // Are we running in a processor set?
595 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
596 result = find_processors_in_pset(pset, &id_array, &id_length);
597 } else {
598 result = find_processors_online(&id_array, &id_length);
599 }
600 if (result == true) {
601 if (id_length >= length) {
602 result = assign_distribution(id_array, id_length, distribution, length);
603 } else {
604 result = false;
605 }
606 }
607 if (id_array != NULL) {
608 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
609 }
610 return result;
611 }
612
613 bool os::bind_to_processor(uint processor_id) {
614 // We assume that a processorid_t can be stored in a uint.
615 assert(sizeof(uint) == sizeof(processorid_t),
616 "can't convert uint to processorid_t");
617 int bind_result =
618 processor_bind(P_LWPID, // bind LWP.
619 P_MYID, // bind current LWP.
620 (processorid_t) processor_id, // id.
621 NULL); // don't return old binding.
622 return (bind_result == 0);
623 }
624
625 bool os::getenv(const char* name, char* buffer, int len) {
626 char* val = ::getenv( name );
627 if ( val == NULL
628 || strlen(val) + 1 > len ) {
629 if (len > 0) buffer[0] = 0; // return a null string
630 return false;
631 }
632 strcpy( buffer, val );
633 return true;
634 }
635
636
637 // Return true if user is running as root.
638
639 bool os::have_special_privileges() {
640 static bool init = false;
641 static bool privileges = false;
642 if (!init) {
643 privileges = (getuid() != geteuid()) || (getgid() != getegid());
644 init = true;
645 }
646 return privileges;
647 }
648
649
650 void os::init_system_properties_values() {
651 char arch[12];
652 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
653
654 // The next steps are taken in the product version:
655 //
656 // Obtain the JAVA_HOME value from the location of libjvm.so.
657 // This library should be located at:
658 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
659 //
660 // If "/jre/lib/" appears at the right place in the path, then we
661 // assume libjvm.so is installed in a JDK and we use this path.
662 //
663 // Otherwise exit with message: "Could not create the Java virtual machine."
664 //
665 // The following extra steps are taken in the debugging version:
666 //
667 // If "/jre/lib/" does NOT appear at the right place in the path
668 // instead of exit check for $JAVA_HOME environment variable.
669 //
670 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
671 // then we append a fake suffix "hotspot/libjvm.so" to this path so
672 // it looks like libjvm.so is installed there
673 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
674 //
675 // Otherwise exit.
676 //
677 // Important note: if the location of libjvm.so changes this
678 // code needs to be changed accordingly.
679
680 // The next few definitions allow the code to be verbatim:
681 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
682 #define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal)
683 #define getenv(n) ::getenv(n)
684
685 #define EXTENSIONS_DIR "/lib/ext"
686 #define ENDORSED_DIR "/lib/endorsed"
687 #define COMMON_DIR "/usr/jdk/packages"
688
689 {
690 /* sysclasspath, java_home, dll_dir */
691 {
692 char *home_path;
693 char *dll_path;
694 char *pslash;
695 char buf[MAXPATHLEN];
696 os::jvm_path(buf, sizeof(buf));
697
698 // Found the full path to libjvm.so.
699 // Now cut the path to <java_home>/jre if we can.
700 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
701 pslash = strrchr(buf, '/');
702 if (pslash != NULL)
703 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
704 dll_path = malloc(strlen(buf) + 1);
705 if (dll_path == NULL)
706 return;
707 strcpy(dll_path, buf);
708 Arguments::set_dll_dir(dll_path);
709
710 if (pslash != NULL) {
711 pslash = strrchr(buf, '/');
712 if (pslash != NULL) {
713 *pslash = '\0'; /* get rid of /<arch> */
714 pslash = strrchr(buf, '/');
715 if (pslash != NULL)
716 *pslash = '\0'; /* get rid of /lib */
717 }
718 }
719
720 home_path = malloc(strlen(buf) + 1);
721 if (home_path == NULL)
722 return;
723 strcpy(home_path, buf);
724 Arguments::set_java_home(home_path);
725
726 if (!set_boot_path('/', ':'))
727 return;
728 }
729
730 /*
731 * Where to look for native libraries
732 */
733 {
734 // Use dlinfo() to determine the correct java.library.path.
735 //
736 // If we're launched by the Java launcher, and the user
737 // does not set java.library.path explicitly on the commandline,
738 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
739 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
740 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
741 // /usr/lib), which is exactly what we want.
742 //
743 // If the user does set java.library.path, it completely
744 // overwrites this setting, and always has.
745 //
746 // If we're not launched by the Java launcher, we may
747 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
748 // settings. Again, dlinfo does exactly what we want.
749
750 Dl_serinfo _info, *info = &_info;
751 Dl_serpath *path;
752 char* library_path;
753 char *common_path;
754 int i;
755
756 // determine search path count and required buffer size
757 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
758 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
759 }
760
761 // allocate new buffer and initialize
762 info = (Dl_serinfo*)malloc(_info.dls_size);
763 if (info == NULL) {
764 vm_exit_out_of_memory(_info.dls_size, OOM_MALLOC_ERROR,
765 "init_system_properties_values info");
766 }
767 info->dls_size = _info.dls_size;
768 info->dls_cnt = _info.dls_cnt;
769
770 // obtain search path information
771 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
772 free(info);
773 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
774 }
775
776 path = &info->dls_serpath[0];
777
778 // Note: Due to a legacy implementation, most of the library path
779 // is set in the launcher. This was to accomodate linking restrictions
780 // on legacy Solaris implementations (which are no longer supported).
781 // Eventually, all the library path setting will be done here.
782 //
783 // However, to prevent the proliferation of improperly built native
784 // libraries, the new path component /usr/jdk/packages is added here.
785
786 // Determine the actual CPU architecture.
787 char cpu_arch[12];
788 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
789 #ifdef _LP64
790 // If we are a 64-bit vm, perform the following translations:
791 // sparc -> sparcv9
792 // i386 -> amd64
793 if (strcmp(cpu_arch, "sparc") == 0)
794 strcat(cpu_arch, "v9");
795 else if (strcmp(cpu_arch, "i386") == 0)
796 strcpy(cpu_arch, "amd64");
797 #endif
798
799 // Construct the invariant part of ld_library_path. Note that the
800 // space for the colon and the trailing null are provided by the
801 // nulls included by the sizeof operator.
802 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
803 common_path = malloc(bufsize);
804 if (common_path == NULL) {
805 free(info);
806 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR,
807 "init_system_properties_values common_path");
808 }
809 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
810
811 // struct size is more than sufficient for the path components obtained
812 // through the dlinfo() call, so only add additional space for the path
813 // components explicitly added here.
814 bufsize = info->dls_size + strlen(common_path);
815 library_path = malloc(bufsize);
816 if (library_path == NULL) {
817 free(info);
818 free(common_path);
819 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR,
820 "init_system_properties_values library_path");
821 }
822 library_path[0] = '\0';
823
824 // Construct the desired Java library path from the linker's library
825 // search path.
826 //
827 // For compatibility, it is optimal that we insert the additional path
828 // components specific to the Java VM after those components specified
829 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
830 // infrastructure.
831 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
832 strcpy(library_path, common_path);
833 } else {
834 int inserted = 0;
835 for (i = 0; i < info->dls_cnt; i++, path++) {
836 uint_t flags = path->dls_flags & LA_SER_MASK;
837 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
838 strcat(library_path, common_path);
839 strcat(library_path, os::path_separator());
840 inserted = 1;
841 }
842 strcat(library_path, path->dls_name);
843 strcat(library_path, os::path_separator());
844 }
845 // eliminate trailing path separator
846 library_path[strlen(library_path)-1] = '\0';
847 }
848
849 // happens before argument parsing - can't use a trace flag
850 // tty->print_raw("init_system_properties_values: native lib path: ");
851 // tty->print_raw_cr(library_path);
852
853 // callee copies into its own buffer
854 Arguments::set_library_path(library_path);
855
856 free(common_path);
857 free(library_path);
858 free(info);
859 }
860
861 /*
862 * Extensions directories.
863 *
864 * Note that the space for the colon and the trailing null are provided
865 * by the nulls included by the sizeof operator (so actually one byte more
866 * than necessary is allocated).
867 */
868 {
869 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
870 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
871 sizeof(EXTENSIONS_DIR));
872 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
873 Arguments::get_java_home());
874 Arguments::set_ext_dirs(buf);
875 }
876
877 /* Endorsed standards default directory. */
878 {
879 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
880 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
881 Arguments::set_endorsed_dirs(buf);
882 }
883 }
884
885 #undef malloc
886 #undef free
887 #undef getenv
888 #undef EXTENSIONS_DIR
889 #undef ENDORSED_DIR
890 #undef COMMON_DIR
891
892 }
893
894 void os::breakpoint() {
895 BREAKPOINT;
896 }
897
898 bool os::obsolete_option(const JavaVMOption *option)
899 {
900 if (!strncmp(option->optionString, "-Xt", 3)) {
901 return true;
902 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
903 return true;
904 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
905 return true;
906 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
907 return true;
908 }
909 return false;
910 }
911
912 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
913 address stackStart = (address)thread->stack_base();
914 address stackEnd = (address)(stackStart - (address)thread->stack_size());
915 if (sp < stackStart && sp >= stackEnd ) return true;
916 return false;
917 }
918
919 extern "C" void breakpoint() {
920 // use debugger to set breakpoint here
921 }
922
923 static thread_t main_thread;
924
925 // Thread start routine for all new Java threads
926 extern "C" void* java_start(void* thread_addr) {
927 // Try to randomize the cache line index of hot stack frames.
928 // This helps when threads of the same stack traces evict each other's
929 // cache lines. The threads can be either from the same JVM instance, or
930 // from different JVM instances. The benefit is especially true for
931 // processors with hyperthreading technology.
932 static int counter = 0;
933 int pid = os::current_process_id();
934 alloca(((pid ^ counter++) & 7) * 128);
935
936 int prio;
937 Thread* thread = (Thread*)thread_addr;
938 OSThread* osthr = thread->osthread();
939
940 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
941 thread->_schedctl = (void *) schedctl_init () ;
942
943 if (UseNUMA) {
944 int lgrp_id = os::numa_get_group_id();
945 if (lgrp_id != -1) {
946 thread->set_lgrp_id(lgrp_id);
947 }
948 }
949
950 // If the creator called set priority before we started,
951 // we need to call set_native_priority now that we have an lwp.
952 // We used to get the priority from thr_getprio (we called
953 // thr_setprio way back in create_thread) and pass it to
954 // set_native_priority, but Solaris scales the priority
955 // in java_to_os_priority, so when we read it back here,
956 // we pass trash to set_native_priority instead of what's
957 // in java_to_os_priority. So we save the native priority
958 // in the osThread and recall it here.
959
960 if ( osthr->thread_id() != -1 ) {
961 if ( UseThreadPriorities ) {
962 int prio = osthr->native_priority();
963 if (ThreadPriorityVerbose) {
964 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
965 INTPTR_FORMAT ", setting priority: %d\n",
966 osthr->thread_id(), osthr->lwp_id(), prio);
967 }
968 os::set_native_priority(thread, prio);
969 }
970 } else if (ThreadPriorityVerbose) {
971 warning("Can't set priority in _start routine, thread id hasn't been set\n");
972 }
973
974 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
975
976 // initialize signal mask for this thread
977 os::Solaris::hotspot_sigmask(thread);
978
979 thread->run();
980
981 // One less thread is executing
982 // When the VMThread gets here, the main thread may have already exited
983 // which frees the CodeHeap containing the Atomic::dec code
984 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
985 Atomic::dec(&os::Solaris::_os_thread_count);
986 }
987
988 if (UseDetachedThreads) {
989 thr_exit(NULL);
990 ShouldNotReachHere();
991 }
992 return NULL;
993 }
994
995 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
996 // Allocate the OSThread object
997 OSThread* osthread = new OSThread(NULL, NULL);
998 if (osthread == NULL) return NULL;
999
1000 // Store info on the Solaris thread into the OSThread
1001 osthread->set_thread_id(thread_id);
1002 osthread->set_lwp_id(_lwp_self());
1003 thread->_schedctl = (void *) schedctl_init () ;
1004
1005 if (UseNUMA) {
1006 int lgrp_id = os::numa_get_group_id();
1007 if (lgrp_id != -1) {
1008 thread->set_lgrp_id(lgrp_id);
1009 }
1010 }
1011
1012 if ( ThreadPriorityVerbose ) {
1013 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1014 osthread->thread_id(), osthread->lwp_id() );
1015 }
1016
1017 // Initial thread state is INITIALIZED, not SUSPENDED
1018 osthread->set_state(INITIALIZED);
1019
1020 return osthread;
1021 }
1022
1023 void os::Solaris::hotspot_sigmask(Thread* thread) {
1024
1025 //Save caller's signal mask
1026 sigset_t sigmask;
1027 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1028 OSThread *osthread = thread->osthread();
1029 osthread->set_caller_sigmask(sigmask);
1030
1031 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1032 if (!ReduceSignalUsage) {
1033 if (thread->is_VM_thread()) {
1034 // Only the VM thread handles BREAK_SIGNAL ...
1035 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1036 } else {
1037 // ... all other threads block BREAK_SIGNAL
1038 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1039 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1040 }
1041 }
1042 }
1043
1044 bool os::create_attached_thread(JavaThread* thread) {
1045 #ifdef ASSERT
1046 thread->verify_not_published();
1047 #endif
1048 OSThread* osthread = create_os_thread(thread, thr_self());
1049 if (osthread == NULL) {
1050 return false;
1051 }
1052
1053 // Initial thread state is RUNNABLE
1054 osthread->set_state(RUNNABLE);
1055 thread->set_osthread(osthread);
1056
1057 // initialize signal mask for this thread
1058 // and save the caller's signal mask
1059 os::Solaris::hotspot_sigmask(thread);
1060
1061 return true;
1062 }
1063
1064 bool os::create_main_thread(JavaThread* thread) {
1065 #ifdef ASSERT
1066 thread->verify_not_published();
1067 #endif
1068 if (_starting_thread == NULL) {
1069 _starting_thread = create_os_thread(thread, main_thread);
1070 if (_starting_thread == NULL) {
1071 return false;
1072 }
1073 }
1074
1075 // The primodial thread is runnable from the start
1076 _starting_thread->set_state(RUNNABLE);
1077
1078 thread->set_osthread(_starting_thread);
1079
1080 // initialize signal mask for this thread
1081 // and save the caller's signal mask
1082 os::Solaris::hotspot_sigmask(thread);
1083
1084 return true;
1085 }
1086
1087 // _T2_libthread is true if we believe we are running with the newer
1088 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1089 bool os::Solaris::_T2_libthread = false;
1090
1091 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1092 // Allocate the OSThread object
1093 OSThread* osthread = new OSThread(NULL, NULL);
1094 if (osthread == NULL) {
1095 return false;
1096 }
1097
1098 if ( ThreadPriorityVerbose ) {
1099 char *thrtyp;
1100 switch ( thr_type ) {
1101 case vm_thread:
1102 thrtyp = (char *)"vm";
1103 break;
1104 case cgc_thread:
1105 thrtyp = (char *)"cgc";
1106 break;
1107 case pgc_thread:
1108 thrtyp = (char *)"pgc";
1109 break;
1110 case java_thread:
1111 thrtyp = (char *)"java";
1112 break;
1113 case compiler_thread:
1114 thrtyp = (char *)"compiler";
1115 break;
1116 case watcher_thread:
1117 thrtyp = (char *)"watcher";
1118 break;
1119 default:
1120 thrtyp = (char *)"unknown";
1121 break;
1122 }
1123 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1124 }
1125
1126 // Calculate stack size if it's not specified by caller.
1127 if (stack_size == 0) {
1128 // The default stack size 1M (2M for LP64).
1129 stack_size = (BytesPerWord >> 2) * K * K;
1130
1131 switch (thr_type) {
1132 case os::java_thread:
1133 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1134 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1135 break;
1136 case os::compiler_thread:
1137 if (CompilerThreadStackSize > 0) {
1138 stack_size = (size_t)(CompilerThreadStackSize * K);
1139 break;
1140 } // else fall through:
1141 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1142 case os::vm_thread:
1143 case os::pgc_thread:
1144 case os::cgc_thread:
1145 case os::watcher_thread:
1146 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1147 break;
1148 }
1149 }
1150 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1151
1152 // Initial state is ALLOCATED but not INITIALIZED
1153 osthread->set_state(ALLOCATED);
1154
1155 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1156 // We got lots of threads. Check if we still have some address space left.
1157 // Need to be at least 5Mb of unreserved address space. We do check by
1158 // trying to reserve some.
1159 const size_t VirtualMemoryBangSize = 20*K*K;
1160 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1161 if (mem == NULL) {
1162 delete osthread;
1163 return false;
1164 } else {
1165 // Release the memory again
1166 os::release_memory(mem, VirtualMemoryBangSize);
1167 }
1168 }
1169
1170 // Setup osthread because the child thread may need it.
1171 thread->set_osthread(osthread);
1172
1173 // Create the Solaris thread
1174 // explicit THR_BOUND for T2_libthread case in case
1175 // that assumption is not accurate, but our alternate signal stack
1176 // handling is based on it which must have bound threads
1177 thread_t tid = 0;
1178 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1179 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1180 (thr_type == vm_thread) ||
1181 (thr_type == cgc_thread) ||
1182 (thr_type == pgc_thread) ||
1183 (thr_type == compiler_thread && BackgroundCompilation)) ?
1184 THR_BOUND : 0);
1185 int status;
1186
1187 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1188 //
1189 // On multiprocessors systems, libthread sometimes under-provisions our
1190 // process with LWPs. On a 30-way systems, for instance, we could have
1191 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1192 // to our process. This can result in under utilization of PEs.
1193 // I suspect the problem is related to libthread's LWP
1194 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1195 // upcall policy.
1196 //
1197 // The following code is palliative -- it attempts to ensure that our
1198 // process has sufficient LWPs to take advantage of multiple PEs.
1199 // Proper long-term cures include using user-level threads bound to LWPs
1200 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1201 // slight timing window with respect to sampling _os_thread_count, but
1202 // the race is benign. Also, we should periodically recompute
1203 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1204 // the number of PEs in our partition. You might be tempted to use
1205 // THR_NEW_LWP here, but I'd recommend against it as that could
1206 // result in undesirable growth of the libthread's LWP pool.
1207 // The fix below isn't sufficient; for instance, it doesn't take into count
1208 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1209 //
1210 // Some pathologies this scheme doesn't handle:
1211 // * Threads can block, releasing the LWPs. The LWPs can age out.
1212 // When a large number of threads become ready again there aren't
1213 // enough LWPs available to service them. This can occur when the
1214 // number of ready threads oscillates.
1215 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1216 //
1217 // Finally, we should call thr_setconcurrency() periodically to refresh
1218 // the LWP pool and thwart the LWP age-out mechanism.
1219 // The "+3" term provides a little slop -- we want to slightly overprovision.
1220
1221 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1222 if (!(flags & THR_BOUND)) {
1223 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1224 }
1225 }
1226 // Although this doesn't hurt, we should warn of undefined behavior
1227 // when using unbound T1 threads with schedctl(). This should never
1228 // happen, as the compiler and VM threads are always created bound
1229 DEBUG_ONLY(
1230 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1231 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1232 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1233 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1234 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1235 }
1236 );
1237
1238
1239 // Mark that we don't have an lwp or thread id yet.
1240 // In case we attempt to set the priority before the thread starts.
1241 osthread->set_lwp_id(-1);
1242 osthread->set_thread_id(-1);
1243
1244 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1245 if (status != 0) {
1246 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1247 perror("os::create_thread");
1248 }
1249 thread->set_osthread(NULL);
1250 // Need to clean up stuff we've allocated so far
1251 delete osthread;
1252 return false;
1253 }
1254
1255 Atomic::inc(&os::Solaris::_os_thread_count);
1256
1257 // Store info on the Solaris thread into the OSThread
1258 osthread->set_thread_id(tid);
1259
1260 // Remember that we created this thread so we can set priority on it
1261 osthread->set_vm_created();
1262
1263 // Set the default thread priority. If using bound threads, setting
1264 // lwp priority will be delayed until thread start.
1265 set_native_priority(thread,
1266 DefaultThreadPriority == -1 ?
1267 java_to_os_priority[NormPriority] :
1268 DefaultThreadPriority);
1269
1270 // Initial thread state is INITIALIZED, not SUSPENDED
1271 osthread->set_state(INITIALIZED);
1272
1273 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1274 return true;
1275 }
1276
1277 /* defined for >= Solaris 10. This allows builds on earlier versions
1278 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1279 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1280 * and -XX:+UseAltSigs does nothing since these should have no conflict
1281 */
1282 #if !defined(SIGJVM1)
1283 #define SIGJVM1 39
1284 #define SIGJVM2 40
1285 #endif
1286
1287 debug_only(static bool signal_sets_initialized = false);
1288 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1289 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1290 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1291
1292 bool os::Solaris::is_sig_ignored(int sig) {
1293 struct sigaction oact;
1294 sigaction(sig, (struct sigaction*)NULL, &oact);
1295 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1296 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1297 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1298 return true;
1299 else
1300 return false;
1301 }
1302
1303 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1304 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1305 static bool isJVM1available() {
1306 return SIGJVM1 < SIGRTMIN;
1307 }
1308
1309 void os::Solaris::signal_sets_init() {
1310 // Should also have an assertion stating we are still single-threaded.
1311 assert(!signal_sets_initialized, "Already initialized");
1312 // Fill in signals that are necessarily unblocked for all threads in
1313 // the VM. Currently, we unblock the following signals:
1314 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1315 // by -Xrs (=ReduceSignalUsage));
1316 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1317 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1318 // the dispositions or masks wrt these signals.
1319 // Programs embedding the VM that want to use the above signals for their
1320 // own purposes must, at this time, use the "-Xrs" option to prevent
1321 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1322 // (See bug 4345157, and other related bugs).
1323 // In reality, though, unblocking these signals is really a nop, since
1324 // these signals are not blocked by default.
1325 sigemptyset(&unblocked_sigs);
1326 sigemptyset(&allowdebug_blocked_sigs);
1327 sigaddset(&unblocked_sigs, SIGILL);
1328 sigaddset(&unblocked_sigs, SIGSEGV);
1329 sigaddset(&unblocked_sigs, SIGBUS);
1330 sigaddset(&unblocked_sigs, SIGFPE);
1331
1332 if (isJVM1available) {
1333 os::Solaris::set_SIGinterrupt(SIGJVM1);
1334 os::Solaris::set_SIGasync(SIGJVM2);
1335 } else if (UseAltSigs) {
1336 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1337 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1338 } else {
1339 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1340 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1341 }
1342
1343 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1344 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1345
1346 if (!ReduceSignalUsage) {
1347 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1348 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1349 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1350 }
1351 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1352 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1353 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1354 }
1355 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1356 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1357 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1358 }
1359 }
1360 // Fill in signals that are blocked by all but the VM thread.
1361 sigemptyset(&vm_sigs);
1362 if (!ReduceSignalUsage)
1363 sigaddset(&vm_sigs, BREAK_SIGNAL);
1364 debug_only(signal_sets_initialized = true);
1365
1366 // For diagnostics only used in run_periodic_checks
1367 sigemptyset(&check_signal_done);
1368 }
1369
1370 // These are signals that are unblocked while a thread is running Java.
1371 // (For some reason, they get blocked by default.)
1372 sigset_t* os::Solaris::unblocked_signals() {
1373 assert(signal_sets_initialized, "Not initialized");
1374 return &unblocked_sigs;
1375 }
1376
1377 // These are the signals that are blocked while a (non-VM) thread is
1378 // running Java. Only the VM thread handles these signals.
1379 sigset_t* os::Solaris::vm_signals() {
1380 assert(signal_sets_initialized, "Not initialized");
1381 return &vm_sigs;
1382 }
1383
1384 // These are signals that are blocked during cond_wait to allow debugger in
1385 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1386 assert(signal_sets_initialized, "Not initialized");
1387 return &allowdebug_blocked_sigs;
1388 }
1389
1390
1391 void _handle_uncaught_cxx_exception() {
1392 VMError err("An uncaught C++ exception");
1393 err.report_and_die();
1394 }
1395
1396
1397 // First crack at OS-specific initialization, from inside the new thread.
1398 void os::initialize_thread(Thread* thr) {
1399 int r = thr_main() ;
1400 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1401 if (r) {
1402 JavaThread* jt = (JavaThread *)thr;
1403 assert(jt != NULL,"Sanity check");
1404 size_t stack_size;
1405 address base = jt->stack_base();
1406 if (Arguments::created_by_java_launcher()) {
1407 // Use 2MB to allow for Solaris 7 64 bit mode.
1408 stack_size = JavaThread::stack_size_at_create() == 0
1409 ? 2048*K : JavaThread::stack_size_at_create();
1410
1411 // There are rare cases when we may have already used more than
1412 // the basic stack size allotment before this method is invoked.
1413 // Attempt to allow for a normally sized java_stack.
1414 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1415 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1416 } else {
1417 // 6269555: If we were not created by a Java launcher, i.e. if we are
1418 // running embedded in a native application, treat the primordial thread
1419 // as much like a native attached thread as possible. This means using
1420 // the current stack size from thr_stksegment(), unless it is too large
1421 // to reliably setup guard pages. A reasonable max size is 8MB.
1422 size_t current_size = current_stack_size();
1423 // This should never happen, but just in case....
1424 if (current_size == 0) current_size = 2 * K * K;
1425 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1426 }
1427 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1428 stack_size = (size_t)(base - bottom);
1429
1430 assert(stack_size > 0, "Stack size calculation problem");
1431
1432 if (stack_size > jt->stack_size()) {
1433 NOT_PRODUCT(
1434 struct rlimit limits;
1435 getrlimit(RLIMIT_STACK, &limits);
1436 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1437 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1438 )
1439 tty->print_cr(
1440 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1441 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1442 "See limit(1) to increase the stack size limit.",
1443 stack_size / K, jt->stack_size() / K);
1444 vm_exit(1);
1445 }
1446 assert(jt->stack_size() >= stack_size,
1447 "Attempt to map more stack than was allocated");
1448 jt->set_stack_size(stack_size);
1449 }
1450
1451 // 5/22/01: Right now alternate signal stacks do not handle
1452 // throwing stack overflow exceptions, see bug 4463178
1453 // Until a fix is found for this, T2 will NOT imply alternate signal
1454 // stacks.
1455 // If using T2 libthread threads, install an alternate signal stack.
1456 // Because alternate stacks associate with LWPs on Solaris,
1457 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1458 // we prefer to explicitly stack bang.
1459 // If not using T2 libthread, but using UseBoundThreads any threads
1460 // (primordial thread, jni_attachCurrentThread) we do not create,
1461 // probably are not bound, therefore they can not have an alternate
1462 // signal stack. Since our stack banging code is generated and
1463 // is shared across threads, all threads must be bound to allow
1464 // using alternate signal stacks. The alternative is to interpose
1465 // on _lwp_create to associate an alt sig stack with each LWP,
1466 // and this could be a problem when the JVM is embedded.
1467 // We would prefer to use alternate signal stacks with T2
1468 // Since there is currently no accurate way to detect T2
1469 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1470 // on installing alternate signal stacks
1471
1472
1473 // 05/09/03: removed alternate signal stack support for Solaris
1474 // The alternate signal stack mechanism is no longer needed to
1475 // handle stack overflow. This is now handled by allocating
1476 // guard pages (red zone) and stackbanging.
1477 // Initially the alternate signal stack mechanism was removed because
1478 // it did not work with T1 llibthread. Alternate
1479 // signal stacks MUST have all threads bound to lwps. Applications
1480 // can create their own threads and attach them without their being
1481 // bound under T1. This is frequently the case for the primordial thread.
1482 // If we were ever to reenable this mechanism we would need to
1483 // use the dynamic check for T2 libthread.
1484
1485 os::Solaris::init_thread_fpu_state();
1486 std::set_terminate(_handle_uncaught_cxx_exception);
1487 }
1488
1489
1490
1491 // Free Solaris resources related to the OSThread
1492 void os::free_thread(OSThread* osthread) {
1493 assert(osthread != NULL, "os::free_thread but osthread not set");
1494
1495
1496 // We are told to free resources of the argument thread,
1497 // but we can only really operate on the current thread.
1498 // The main thread must take the VMThread down synchronously
1499 // before the main thread exits and frees up CodeHeap
1500 guarantee((Thread::current()->osthread() == osthread
1501 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1502 if (Thread::current()->osthread() == osthread) {
1503 // Restore caller's signal mask
1504 sigset_t sigmask = osthread->caller_sigmask();
1505 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1506 }
1507 delete osthread;
1508 }
1509
1510 void os::pd_start_thread(Thread* thread) {
1511 int status = thr_continue(thread->osthread()->thread_id());
1512 assert_status(status == 0, status, "thr_continue failed");
1513 }
1514
1515
1516 intx os::current_thread_id() {
1517 return (intx)thr_self();
1518 }
1519
1520 static pid_t _initial_pid = 0;
1521
1522 int os::current_process_id() {
1523 return (int)(_initial_pid ? _initial_pid : getpid());
1524 }
1525
1526 int os::allocate_thread_local_storage() {
1527 // %%% in Win32 this allocates a memory segment pointed to by a
1528 // register. Dan Stein can implement a similar feature in
1529 // Solaris. Alternatively, the VM can do the same thing
1530 // explicitly: malloc some storage and keep the pointer in a
1531 // register (which is part of the thread's context) (or keep it
1532 // in TLS).
1533 // %%% In current versions of Solaris, thr_self and TSD can
1534 // be accessed via short sequences of displaced indirections.
1535 // The value of thr_self is available as %g7(36).
1536 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1537 // assuming that the current thread already has a value bound to k.
1538 // It may be worth experimenting with such access patterns,
1539 // and later having the parameters formally exported from a Solaris
1540 // interface. I think, however, that it will be faster to
1541 // maintain the invariant that %g2 always contains the
1542 // JavaThread in Java code, and have stubs simply
1543 // treat %g2 as a caller-save register, preserving it in a %lN.
1544 thread_key_t tk;
1545 if (thr_keycreate( &tk, NULL ) )
1546 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1547 "(%s)", strerror(errno)));
1548 return int(tk);
1549 }
1550
1551 void os::free_thread_local_storage(int index) {
1552 // %%% don't think we need anything here
1553 // if ( pthread_key_delete((pthread_key_t) tk) )
1554 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1555 }
1556
1557 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1558 // small number - point is NO swap space available
1559 void os::thread_local_storage_at_put(int index, void* value) {
1560 // %%% this is used only in threadLocalStorage.cpp
1561 if (thr_setspecific((thread_key_t)index, value)) {
1562 if (errno == ENOMEM) {
1563 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR,
1564 "thr_setspecific: out of swap space");
1565 } else {
1566 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1567 "(%s)", strerror(errno)));
1568 }
1569 } else {
1570 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1571 }
1572 }
1573
1574 // This function could be called before TLS is initialized, for example, when
1575 // VM receives an async signal or when VM causes a fatal error during
1576 // initialization. Return NULL if thr_getspecific() fails.
1577 void* os::thread_local_storage_at(int index) {
1578 // %%% this is used only in threadLocalStorage.cpp
1579 void* r = NULL;
1580 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1581 }
1582
1583
1584 // gethrtime can move backwards if read from one cpu and then a different cpu
1585 // getTimeNanos is guaranteed to not move backward on Solaris
1586 // local spinloop created as faster for a CAS on an int than
1587 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1588 // supported on sparc v8 or pre supports_cx8 intel boxes.
1589 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1590 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1591 inline hrtime_t oldgetTimeNanos() {
1592 int gotlock = LOCK_INVALID;
1593 hrtime_t newtime = gethrtime();
1594
1595 for (;;) {
1596 // grab lock for max_hrtime
1597 int curlock = max_hrtime_lock;
1598 if (curlock & LOCK_BUSY) continue;
1599 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1600 if (newtime > max_hrtime) {
1601 max_hrtime = newtime;
1602 } else {
1603 newtime = max_hrtime;
1604 }
1605 // release lock
1606 max_hrtime_lock = LOCK_FREE;
1607 return newtime;
1608 }
1609 }
1610 // gethrtime can move backwards if read from one cpu and then a different cpu
1611 // getTimeNanos is guaranteed to not move backward on Solaris
1612 inline hrtime_t getTimeNanos() {
1613 if (VM_Version::supports_cx8()) {
1614 const hrtime_t now = gethrtime();
1615 // Use atomic long load since 32-bit x86 uses 2 registers to keep long.
1616 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime);
1617 if (now <= prev) return prev; // same or retrograde time;
1618 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1619 assert(obsv >= prev, "invariant"); // Monotonicity
1620 // If the CAS succeeded then we're done and return "now".
1621 // If the CAS failed and the observed value "obs" is >= now then
1622 // we should return "obs". If the CAS failed and now > obs > prv then
1623 // some other thread raced this thread and installed a new value, in which case
1624 // we could either (a) retry the entire operation, (b) retry trying to install now
1625 // or (c) just return obs. We use (c). No loop is required although in some cases
1626 // we might discard a higher "now" value in deference to a slightly lower but freshly
1627 // installed obs value. That's entirely benign -- it admits no new orderings compared
1628 // to (a) or (b) -- and greatly reduces coherence traffic.
1629 // We might also condition (c) on the magnitude of the delta between obs and now.
1630 // Avoiding excessive CAS operations to hot RW locations is critical.
1631 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1632 return (prev == obsv) ? now : obsv ;
1633 } else {
1634 return oldgetTimeNanos();
1635 }
1636 }
1637
1638 // Time since start-up in seconds to a fine granularity.
1639 // Used by VMSelfDestructTimer and the MemProfiler.
1640 double os::elapsedTime() {
1641 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1642 }
1643
1644 jlong os::elapsed_counter() {
1645 return (jlong)(getTimeNanos() - first_hrtime);
1646 }
1647
1648 jlong os::elapsed_frequency() {
1649 return hrtime_hz;
1650 }
1651
1652 // Return the real, user, and system times in seconds from an
1653 // arbitrary fixed point in the past.
1654 bool os::getTimesSecs(double* process_real_time,
1655 double* process_user_time,
1656 double* process_system_time) {
1657 struct tms ticks;
1658 clock_t real_ticks = times(&ticks);
1659
1660 if (real_ticks == (clock_t) (-1)) {
1661 return false;
1662 } else {
1663 double ticks_per_second = (double) clock_tics_per_sec;
1664 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1665 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1666 // For consistency return the real time from getTimeNanos()
1667 // converted to seconds.
1668 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1669
1670 return true;
1671 }
1672 }
1673
1674 bool os::supports_vtime() { return true; }
1675
1676 bool os::enable_vtime() {
1677 int fd = ::open("/proc/self/ctl", O_WRONLY);
1678 if (fd == -1)
1679 return false;
1680
1681 long cmd[] = { PCSET, PR_MSACCT };
1682 int res = ::write(fd, cmd, sizeof(long) * 2);
1683 ::close(fd);
1684 if (res != sizeof(long) * 2)
1685 return false;
1686
1687 return true;
1688 }
1689
1690 bool os::vtime_enabled() {
1691 int fd = ::open("/proc/self/status", O_RDONLY);
1692 if (fd == -1)
1693 return false;
1694
1695 pstatus_t status;
1696 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1697 ::close(fd);
1698 if (res != sizeof(pstatus_t))
1699 return false;
1700
1701 return status.pr_flags & PR_MSACCT;
1702 }
1703
1704 double os::elapsedVTime() {
1705 return (double)gethrvtime() / (double)hrtime_hz;
1706 }
1707
1708 // Used internally for comparisons only
1709 // getTimeMillis guaranteed to not move backwards on Solaris
1710 jlong getTimeMillis() {
1711 jlong nanotime = getTimeNanos();
1712 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1713 }
1714
1715 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1716 jlong os::javaTimeMillis() {
1717 timeval t;
1718 if (gettimeofday( &t, NULL) == -1)
1719 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1720 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1721 }
1722
1723 jlong os::javaTimeNanos() {
1724 return (jlong)getTimeNanos();
1725 }
1726
1727 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1728 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1729 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1730 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1731 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1732 }
1733
1734 char * os::local_time_string(char *buf, size_t buflen) {
1735 struct tm t;
1736 time_t long_time;
1737 time(&long_time);
1738 localtime_r(&long_time, &t);
1739 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1740 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1741 t.tm_hour, t.tm_min, t.tm_sec);
1742 return buf;
1743 }
1744
1745 // Note: os::shutdown() might be called very early during initialization, or
1746 // called from signal handler. Before adding something to os::shutdown(), make
1747 // sure it is async-safe and can handle partially initialized VM.
1748 void os::shutdown() {
1749
1750 // allow PerfMemory to attempt cleanup of any persistent resources
1751 perfMemory_exit();
1752
1753 // needs to remove object in file system
1754 AttachListener::abort();
1755
1756 // flush buffered output, finish log files
1757 ostream_abort();
1758
1759 // Check for abort hook
1760 abort_hook_t abort_hook = Arguments::abort_hook();
1761 if (abort_hook != NULL) {
1762 abort_hook();
1763 }
1764 }
1765
1766 // Note: os::abort() might be called very early during initialization, or
1767 // called from signal handler. Before adding something to os::abort(), make
1768 // sure it is async-safe and can handle partially initialized VM.
1769 void os::abort(bool dump_core) {
1770 os::shutdown();
1771 if (dump_core) {
1772 #ifndef PRODUCT
1773 fdStream out(defaultStream::output_fd());
1774 out.print_raw("Current thread is ");
1775 char buf[16];
1776 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1777 out.print_raw_cr(buf);
1778 out.print_raw_cr("Dumping core ...");
1779 #endif
1780 ::abort(); // dump core (for debugging)
1781 }
1782
1783 ::exit(1);
1784 }
1785
1786 // Die immediately, no exit hook, no abort hook, no cleanup.
1787 void os::die() {
1788 ::abort(); // dump core (for debugging)
1789 }
1790
1791 // unused
1792 void os::set_error_file(const char *logfile) {}
1793
1794 // DLL functions
1795
1796 const char* os::dll_file_extension() { return ".so"; }
1797
1798 // This must be hard coded because it's the system's temporary
1799 // directory not the java application's temp directory, ala java.io.tmpdir.
1800 const char* os::get_temp_directory() { return "/tmp"; }
1801
1802 static bool file_exists(const char* filename) {
1803 struct stat statbuf;
1804 if (filename == NULL || strlen(filename) == 0) {
1805 return false;
1806 }
1807 return os::stat(filename, &statbuf) == 0;
1808 }
1809
1810 bool os::dll_build_name(char* buffer, size_t buflen,
1811 const char* pname, const char* fname) {
1812 bool retval = false;
1813 const size_t pnamelen = pname ? strlen(pname) : 0;
1814
1815 // Return error on buffer overflow.
1816 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1817 return retval;
1818 }
1819
1820 if (pnamelen == 0) {
1821 snprintf(buffer, buflen, "lib%s.so", fname);
1822 retval = true;
1823 } else if (strchr(pname, *os::path_separator()) != NULL) {
1824 int n;
1825 char** pelements = split_path(pname, &n);
1826 if (pelements == NULL) {
1827 return false;
1828 }
1829 for (int i = 0 ; i < n ; i++) {
1830 // really shouldn't be NULL but what the heck, check can't hurt
1831 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1832 continue; // skip the empty path values
1833 }
1834 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1835 if (file_exists(buffer)) {
1836 retval = true;
1837 break;
1838 }
1839 }
1840 // release the storage
1841 for (int i = 0 ; i < n ; i++) {
1842 if (pelements[i] != NULL) {
1843 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1844 }
1845 }
1846 if (pelements != NULL) {
1847 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1848 }
1849 } else {
1850 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1851 retval = true;
1852 }
1853 return retval;
1854 }
1855
1856 // check if addr is inside libjvm.so
1857 bool os::address_is_in_vm(address addr) {
1858 static address libjvm_base_addr;
1859 Dl_info dlinfo;
1860
1861 if (libjvm_base_addr == NULL) {
1862 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1863 libjvm_base_addr = (address)dlinfo.dli_fbase;
1864 }
1865 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1866 }
1867
1868 if (dladdr((void *)addr, &dlinfo) != 0) {
1869 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1870 }
1871
1872 return false;
1873 }
1874
1875 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1876 static dladdr1_func_type dladdr1_func = NULL;
1877
1878 bool os::dll_address_to_function_name(address addr, char *buf,
1879 int buflen, int * offset) {
1880 // buf is not optional, but offset is optional
1881 assert(buf != NULL, "sanity check");
1882
1883 Dl_info dlinfo;
1884
1885 // dladdr1_func was initialized in os::init()
1886 if (dladdr1_func != NULL) {
1887 // yes, we have dladdr1
1888
1889 // Support for dladdr1 is checked at runtime; it may be
1890 // available even if the vm is built on a machine that does
1891 // not have dladdr1 support. Make sure there is a value for
1892 // RTLD_DL_SYMENT.
1893 #ifndef RTLD_DL_SYMENT
1894 #define RTLD_DL_SYMENT 1
1895 #endif
1896 #ifdef _LP64
1897 Elf64_Sym * info;
1898 #else
1899 Elf32_Sym * info;
1900 #endif
1901 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1902 RTLD_DL_SYMENT) != 0) {
1903 // see if we have a matching symbol that covers our address
1904 if (dlinfo.dli_saddr != NULL &&
1905 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1906 if (dlinfo.dli_sname != NULL) {
1907 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1908 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1909 }
1910 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1911 return true;
1912 }
1913 }
1914 // no matching symbol so try for just file info
1915 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1916 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1917 buf, buflen, offset, dlinfo.dli_fname)) {
1918 return true;
1919 }
1920 }
1921 }
1922 buf[0] = '\0';
1923 if (offset != NULL) *offset = -1;
1924 return false;
1925 }
1926
1927 // no, only dladdr is available
1928 if (dladdr((void *)addr, &dlinfo) != 0) {
1929 // see if we have a matching symbol
1930 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1931 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1932 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1933 }
1934 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1935 return true;
1936 }
1937 // no matching symbol so try for just file info
1938 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1939 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1940 buf, buflen, offset, dlinfo.dli_fname)) {
1941 return true;
1942 }
1943 }
1944 }
1945 buf[0] = '\0';
1946 if (offset != NULL) *offset = -1;
1947 return false;
1948 }
1949
1950 bool os::dll_address_to_library_name(address addr, char* buf,
1951 int buflen, int* offset) {
1952 // buf is not optional, but offset is optional
1953 assert(buf != NULL, "sanity check");
1954
1955 Dl_info dlinfo;
1956
1957 if (dladdr((void*)addr, &dlinfo) != 0) {
1958 if (dlinfo.dli_fname != NULL) {
1959 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1960 }
1961 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1962 *offset = addr - (address)dlinfo.dli_fbase;
1963 }
1964 return true;
1965 }
1966
1967 buf[0] = '\0';
1968 if (offset) *offset = -1;
1969 return false;
1970 }
1971
1972 // Prints the names and full paths of all opened dynamic libraries
1973 // for current process
1974 void os::print_dll_info(outputStream * st) {
1975 Dl_info dli;
1976 void *handle;
1977 Link_map *map;
1978 Link_map *p;
1979
1980 st->print_cr("Dynamic libraries:"); st->flush();
1981
1982 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1983 dli.dli_fname == NULL) {
1984 st->print_cr("Error: Cannot print dynamic libraries.");
1985 return;
1986 }
1987 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1988 if (handle == NULL) {
1989 st->print_cr("Error: Cannot print dynamic libraries.");
1990 return;
1991 }
1992 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1993 if (map == NULL) {
1994 st->print_cr("Error: Cannot print dynamic libraries.");
1995 return;
1996 }
1997
1998 while (map->l_prev != NULL)
1999 map = map->l_prev;
2000
2001 while (map != NULL) {
2002 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2003 map = map->l_next;
2004 }
2005
2006 dlclose(handle);
2007 }
2008
2009 // Loads .dll/.so and
2010 // in case of error it checks if .dll/.so was built for the
2011 // same architecture as Hotspot is running on
2012
2013 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2014 {
2015 void * result= ::dlopen(filename, RTLD_LAZY);
2016 if (result != NULL) {
2017 // Successful loading
2018 return result;
2019 }
2020
2021 Elf32_Ehdr elf_head;
2022
2023 // Read system error message into ebuf
2024 // It may or may not be overwritten below
2025 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2026 ebuf[ebuflen-1]='\0';
2027 int diag_msg_max_length=ebuflen-strlen(ebuf);
2028 char* diag_msg_buf=ebuf+strlen(ebuf);
2029
2030 if (diag_msg_max_length==0) {
2031 // No more space in ebuf for additional diagnostics message
2032 return NULL;
2033 }
2034
2035
2036 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2037
2038 if (file_descriptor < 0) {
2039 // Can't open library, report dlerror() message
2040 return NULL;
2041 }
2042
2043 bool failed_to_read_elf_head=
2044 (sizeof(elf_head)!=
2045 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2046
2047 ::close(file_descriptor);
2048 if (failed_to_read_elf_head) {
2049 // file i/o error - report dlerror() msg
2050 return NULL;
2051 }
2052
2053 typedef struct {
2054 Elf32_Half code; // Actual value as defined in elf.h
2055 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2056 char elf_class; // 32 or 64 bit
2057 char endianess; // MSB or LSB
2058 char* name; // String representation
2059 } arch_t;
2060
2061 static const arch_t arch_array[]={
2062 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2063 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2064 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2065 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2066 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2067 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2068 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2069 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2070 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2071 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2072 };
2073
2074 #if (defined IA32)
2075 static Elf32_Half running_arch_code=EM_386;
2076 #elif (defined AMD64)
2077 static Elf32_Half running_arch_code=EM_X86_64;
2078 #elif (defined IA64)
2079 static Elf32_Half running_arch_code=EM_IA_64;
2080 #elif (defined __sparc) && (defined _LP64)
2081 static Elf32_Half running_arch_code=EM_SPARCV9;
2082 #elif (defined __sparc) && (!defined _LP64)
2083 static Elf32_Half running_arch_code=EM_SPARC;
2084 #elif (defined __powerpc64__)
2085 static Elf32_Half running_arch_code=EM_PPC64;
2086 #elif (defined __powerpc__)
2087 static Elf32_Half running_arch_code=EM_PPC;
2088 #elif (defined ARM)
2089 static Elf32_Half running_arch_code=EM_ARM;
2090 #else
2091 #error Method os::dll_load requires that one of following is defined:\
2092 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2093 #endif
2094
2095 // Identify compatability class for VM's architecture and library's architecture
2096 // Obtain string descriptions for architectures
2097
2098 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2099 int running_arch_index=-1;
2100
2101 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2102 if (running_arch_code == arch_array[i].code) {
2103 running_arch_index = i;
2104 }
2105 if (lib_arch.code == arch_array[i].code) {
2106 lib_arch.compat_class = arch_array[i].compat_class;
2107 lib_arch.name = arch_array[i].name;
2108 }
2109 }
2110
2111 assert(running_arch_index != -1,
2112 "Didn't find running architecture code (running_arch_code) in arch_array");
2113 if (running_arch_index == -1) {
2114 // Even though running architecture detection failed
2115 // we may still continue with reporting dlerror() message
2116 return NULL;
2117 }
2118
2119 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2120 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2121 return NULL;
2122 }
2123
2124 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2125 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2126 return NULL;
2127 }
2128
2129 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2130 if ( lib_arch.name!=NULL ) {
2131 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2132 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2133 lib_arch.name, arch_array[running_arch_index].name);
2134 } else {
2135 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2136 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2137 lib_arch.code,
2138 arch_array[running_arch_index].name);
2139 }
2140 }
2141
2142 return NULL;
2143 }
2144
2145 void* os::dll_lookup(void* handle, const char* name) {
2146 return dlsym(handle, name);
2147 }
2148
2149 void* os::get_default_process_handle() {
2150 return (void*)::dlopen(NULL, RTLD_LAZY);
2151 }
2152
2153 int os::stat(const char *path, struct stat *sbuf) {
2154 char pathbuf[MAX_PATH];
2155 if (strlen(path) > MAX_PATH - 1) {
2156 errno = ENAMETOOLONG;
2157 return -1;
2158 }
2159 os::native_path(strcpy(pathbuf, path));
2160 return ::stat(pathbuf, sbuf);
2161 }
2162
2163 static bool _print_ascii_file(const char* filename, outputStream* st) {
2164 int fd = ::open(filename, O_RDONLY);
2165 if (fd == -1) {
2166 return false;
2167 }
2168
2169 char buf[32];
2170 int bytes;
2171 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2172 st->print_raw(buf, bytes);
2173 }
2174
2175 ::close(fd);
2176
2177 return true;
2178 }
2179
2180 void os::print_os_info_brief(outputStream* st) {
2181 os::Solaris::print_distro_info(st);
2182
2183 os::Posix::print_uname_info(st);
2184
2185 os::Solaris::print_libversion_info(st);
2186 }
2187
2188 void os::print_os_info(outputStream* st) {
2189 st->print("OS:");
2190
2191 os::Solaris::print_distro_info(st);
2192
2193 os::Posix::print_uname_info(st);
2194
2195 os::Solaris::print_libversion_info(st);
2196
2197 os::Posix::print_rlimit_info(st);
2198
2199 os::Posix::print_load_average(st);
2200 }
2201
2202 void os::Solaris::print_distro_info(outputStream* st) {
2203 if (!_print_ascii_file("/etc/release", st)) {
2204 st->print("Solaris");
2205 }
2206 st->cr();
2207 }
2208
2209 void os::Solaris::print_libversion_info(outputStream* st) {
2210 if (os::Solaris::T2_libthread()) {
2211 st->print(" (T2 libthread)");
2212 }
2213 else {
2214 st->print(" (T1 libthread)");
2215 }
2216 st->cr();
2217 }
2218
2219 static bool check_addr0(outputStream* st) {
2220 jboolean status = false;
2221 int fd = ::open("/proc/self/map",O_RDONLY);
2222 if (fd >= 0) {
2223 prmap_t p;
2224 while(::read(fd, &p, sizeof(p)) > 0) {
2225 if (p.pr_vaddr == 0x0) {
2226 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2227 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2228 st->print("Access:");
2229 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2230 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2231 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2232 st->cr();
2233 status = true;
2234 }
2235 ::close(fd);
2236 }
2237 }
2238 return status;
2239 }
2240
2241 void os::pd_print_cpu_info(outputStream* st) {
2242 // Nothing to do for now.
2243 }
2244
2245 void os::print_memory_info(outputStream* st) {
2246 st->print("Memory:");
2247 st->print(" %dk page", os::vm_page_size()>>10);
2248 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2249 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2250 st->cr();
2251 (void) check_addr0(st);
2252 }
2253
2254 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2255 // but they're the same for all the solaris architectures that we support.
2256 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2257 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2258 "ILL_COPROC", "ILL_BADSTK" };
2259
2260 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2261 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2262 "FPE_FLTINV", "FPE_FLTSUB" };
2263
2264 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2265
2266 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2267
2268 void os::print_siginfo(outputStream* st, void* siginfo) {
2269 st->print("siginfo:");
2270
2271 const int buflen = 100;
2272 char buf[buflen];
2273 siginfo_t *si = (siginfo_t*)siginfo;
2274 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2275 char *err = strerror(si->si_errno);
2276 if (si->si_errno != 0 && err != NULL) {
2277 st->print("si_errno=%s", err);
2278 } else {
2279 st->print("si_errno=%d", si->si_errno);
2280 }
2281 const int c = si->si_code;
2282 assert(c > 0, "unexpected si_code");
2283 switch (si->si_signo) {
2284 case SIGILL:
2285 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2286 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2287 break;
2288 case SIGFPE:
2289 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2290 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2291 break;
2292 case SIGSEGV:
2293 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2294 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2295 break;
2296 case SIGBUS:
2297 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2298 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2299 break;
2300 default:
2301 st->print(", si_code=%d", si->si_code);
2302 // no si_addr
2303 }
2304
2305 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2306 UseSharedSpaces) {
2307 FileMapInfo* mapinfo = FileMapInfo::current_info();
2308 if (mapinfo->is_in_shared_space(si->si_addr)) {
2309 st->print("\n\nError accessing class data sharing archive." \
2310 " Mapped file inaccessible during execution, " \
2311 " possible disk/network problem.");
2312 }
2313 }
2314 st->cr();
2315 }
2316
2317 // Moved from whole group, because we need them here for diagnostic
2318 // prints.
2319 #define OLDMAXSIGNUM 32
2320 static int Maxsignum = 0;
2321 static int *ourSigFlags = NULL;
2322
2323 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2324
2325 int os::Solaris::get_our_sigflags(int sig) {
2326 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2327 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2328 return ourSigFlags[sig];
2329 }
2330
2331 void os::Solaris::set_our_sigflags(int sig, int flags) {
2332 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2333 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2334 ourSigFlags[sig] = flags;
2335 }
2336
2337
2338 static const char* get_signal_handler_name(address handler,
2339 char* buf, int buflen) {
2340 int offset;
2341 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2342 if (found) {
2343 // skip directory names
2344 const char *p1, *p2;
2345 p1 = buf;
2346 size_t len = strlen(os::file_separator());
2347 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2348 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2349 } else {
2350 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2351 }
2352 return buf;
2353 }
2354
2355 static void print_signal_handler(outputStream* st, int sig,
2356 char* buf, size_t buflen) {
2357 struct sigaction sa;
2358
2359 sigaction(sig, NULL, &sa);
2360
2361 st->print("%s: ", os::exception_name(sig, buf, buflen));
2362
2363 address handler = (sa.sa_flags & SA_SIGINFO)
2364 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2365 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2366
2367 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2368 st->print("SIG_DFL");
2369 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2370 st->print("SIG_IGN");
2371 } else {
2372 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2373 }
2374
2375 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2376
2377 address rh = VMError::get_resetted_sighandler(sig);
2378 // May be, handler was resetted by VMError?
2379 if(rh != NULL) {
2380 handler = rh;
2381 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2382 }
2383
2384 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2385
2386 // Check: is it our handler?
2387 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2388 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2389 // It is our signal handler
2390 // check for flags
2391 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2392 st->print(
2393 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2394 os::Solaris::get_our_sigflags(sig));
2395 }
2396 }
2397 st->cr();
2398 }
2399
2400 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2401 st->print_cr("Signal Handlers:");
2402 print_signal_handler(st, SIGSEGV, buf, buflen);
2403 print_signal_handler(st, SIGBUS , buf, buflen);
2404 print_signal_handler(st, SIGFPE , buf, buflen);
2405 print_signal_handler(st, SIGPIPE, buf, buflen);
2406 print_signal_handler(st, SIGXFSZ, buf, buflen);
2407 print_signal_handler(st, SIGILL , buf, buflen);
2408 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2409 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2410 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2411 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2412 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2413 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2414 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2415 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2416 }
2417
2418 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2419
2420 // Find the full path to the current module, libjvm.so
2421 void os::jvm_path(char *buf, jint buflen) {
2422 // Error checking.
2423 if (buflen < MAXPATHLEN) {
2424 assert(false, "must use a large-enough buffer");
2425 buf[0] = '\0';
2426 return;
2427 }
2428 // Lazy resolve the path to current module.
2429 if (saved_jvm_path[0] != 0) {
2430 strcpy(buf, saved_jvm_path);
2431 return;
2432 }
2433
2434 Dl_info dlinfo;
2435 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2436 assert(ret != 0, "cannot locate libjvm");
2437 if (ret != 0 && dlinfo.dli_fname != NULL) {
2438 realpath((char *)dlinfo.dli_fname, buf);
2439 } else {
2440 buf[0] = '\0';
2441 return;
2442 }
2443
2444 if (Arguments::created_by_gamma_launcher()) {
2445 // Support for the gamma launcher. Typical value for buf is
2446 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2447 // the right place in the string, then assume we are installed in a JDK and
2448 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2449 // up the path so it looks like libjvm.so is installed there (append a
2450 // fake suffix hotspot/libjvm.so).
2451 const char *p = buf + strlen(buf) - 1;
2452 for (int count = 0; p > buf && count < 5; ++count) {
2453 for (--p; p > buf && *p != '/'; --p)
2454 /* empty */ ;
2455 }
2456
2457 if (strncmp(p, "/jre/lib/", 9) != 0) {
2458 // Look for JAVA_HOME in the environment.
2459 char* java_home_var = ::getenv("JAVA_HOME");
2460 if (java_home_var != NULL && java_home_var[0] != 0) {
2461 char cpu_arch[12];
2462 char* jrelib_p;
2463 int len;
2464 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2465 #ifdef _LP64
2466 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2467 if (strcmp(cpu_arch, "sparc") == 0) {
2468 strcat(cpu_arch, "v9");
2469 } else if (strcmp(cpu_arch, "i386") == 0) {
2470 strcpy(cpu_arch, "amd64");
2471 }
2472 #endif
2473 // Check the current module name "libjvm.so".
2474 p = strrchr(buf, '/');
2475 assert(strstr(p, "/libjvm") == p, "invalid library name");
2476
2477 realpath(java_home_var, buf);
2478 // determine if this is a legacy image or modules image
2479 // modules image doesn't have "jre" subdirectory
2480 len = strlen(buf);
2481 jrelib_p = buf + len;
2482 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2483 if (0 != access(buf, F_OK)) {
2484 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2485 }
2486
2487 if (0 == access(buf, F_OK)) {
2488 // Use current module name "libjvm.so"
2489 len = strlen(buf);
2490 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2491 } else {
2492 // Go back to path of .so
2493 realpath((char *)dlinfo.dli_fname, buf);
2494 }
2495 }
2496 }
2497 }
2498
2499 strcpy(saved_jvm_path, buf);
2500 }
2501
2502
2503 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2504 // no prefix required, not even "_"
2505 }
2506
2507
2508 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2509 // no suffix required
2510 }
2511
2512 // This method is a copy of JDK's sysGetLastErrorString
2513 // from src/solaris/hpi/src/system_md.c
2514
2515 size_t os::lasterror(char *buf, size_t len) {
2516
2517 if (errno == 0) return 0;
2518
2519 const char *s = ::strerror(errno);
2520 size_t n = ::strlen(s);
2521 if (n >= len) {
2522 n = len - 1;
2523 }
2524 ::strncpy(buf, s, n);
2525 buf[n] = '\0';
2526 return n;
2527 }
2528
2529
2530 // sun.misc.Signal
2531
2532 extern "C" {
2533 static void UserHandler(int sig, void *siginfo, void *context) {
2534 // Ctrl-C is pressed during error reporting, likely because the error
2535 // handler fails to abort. Let VM die immediately.
2536 if (sig == SIGINT && is_error_reported()) {
2537 os::die();
2538 }
2539
2540 os::signal_notify(sig);
2541 // We do not need to reinstate the signal handler each time...
2542 }
2543 }
2544
2545 void* os::user_handler() {
2546 return CAST_FROM_FN_PTR(void*, UserHandler);
2547 }
2548
2549 class Semaphore : public StackObj {
2550 public:
2551 Semaphore();
2552 ~Semaphore();
2553 void signal();
2554 void wait();
2555 bool trywait();
2556 bool timedwait(unsigned int sec, int nsec);
2557 private:
2558 sema_t _semaphore;
2559 };
2560
2561
2562 Semaphore::Semaphore() {
2563 sema_init(&_semaphore, 0, NULL, NULL);
2564 }
2565
2566 Semaphore::~Semaphore() {
2567 sema_destroy(&_semaphore);
2568 }
2569
2570 void Semaphore::signal() {
2571 sema_post(&_semaphore);
2572 }
2573
2574 void Semaphore::wait() {
2575 sema_wait(&_semaphore);
2576 }
2577
2578 bool Semaphore::trywait() {
2579 return sema_trywait(&_semaphore) == 0;
2580 }
2581
2582 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2583 struct timespec ts;
2584 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2585
2586 while (1) {
2587 int result = sema_timedwait(&_semaphore, &ts);
2588 if (result == 0) {
2589 return true;
2590 } else if (errno == EINTR) {
2591 continue;
2592 } else if (errno == ETIME) {
2593 return false;
2594 } else {
2595 return false;
2596 }
2597 }
2598 }
2599
2600 extern "C" {
2601 typedef void (*sa_handler_t)(int);
2602 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2603 }
2604
2605 void* os::signal(int signal_number, void* handler) {
2606 struct sigaction sigAct, oldSigAct;
2607 sigfillset(&(sigAct.sa_mask));
2608 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2609 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2610
2611 if (sigaction(signal_number, &sigAct, &oldSigAct))
2612 // -1 means registration failed
2613 return (void *)-1;
2614
2615 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2616 }
2617
2618 void os::signal_raise(int signal_number) {
2619 raise(signal_number);
2620 }
2621
2622 /*
2623 * The following code is moved from os.cpp for making this
2624 * code platform specific, which it is by its very nature.
2625 */
2626
2627 // a counter for each possible signal value
2628 static int Sigexit = 0;
2629 static int Maxlibjsigsigs;
2630 static jint *pending_signals = NULL;
2631 static int *preinstalled_sigs = NULL;
2632 static struct sigaction *chainedsigactions = NULL;
2633 static sema_t sig_sem;
2634 typedef int (*version_getting_t)();
2635 version_getting_t os::Solaris::get_libjsig_version = NULL;
2636 static int libjsigversion = NULL;
2637
2638 int os::sigexitnum_pd() {
2639 assert(Sigexit > 0, "signal memory not yet initialized");
2640 return Sigexit;
2641 }
2642
2643 void os::Solaris::init_signal_mem() {
2644 // Initialize signal structures
2645 Maxsignum = SIGRTMAX;
2646 Sigexit = Maxsignum+1;
2647 assert(Maxsignum >0, "Unable to obtain max signal number");
2648
2649 Maxlibjsigsigs = Maxsignum;
2650
2651 // pending_signals has one int per signal
2652 // The additional signal is for SIGEXIT - exit signal to signal_thread
2653 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2654 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2655
2656 if (UseSignalChaining) {
2657 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2658 * (Maxsignum + 1), mtInternal);
2659 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2660 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2661 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2662 }
2663 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2664 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2665 }
2666
2667 void os::signal_init_pd() {
2668 int ret;
2669
2670 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2671 assert(ret == 0, "sema_init() failed");
2672 }
2673
2674 void os::signal_notify(int signal_number) {
2675 int ret;
2676
2677 Atomic::inc(&pending_signals[signal_number]);
2678 ret = ::sema_post(&sig_sem);
2679 assert(ret == 0, "sema_post() failed");
2680 }
2681
2682 static int check_pending_signals(bool wait_for_signal) {
2683 int ret;
2684 while (true) {
2685 for (int i = 0; i < Sigexit + 1; i++) {
2686 jint n = pending_signals[i];
2687 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2688 return i;
2689 }
2690 }
2691 if (!wait_for_signal) {
2692 return -1;
2693 }
2694 JavaThread *thread = JavaThread::current();
2695 ThreadBlockInVM tbivm(thread);
2696
2697 bool threadIsSuspended;
2698 do {
2699 thread->set_suspend_equivalent();
2700 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2701 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2702 ;
2703 assert(ret == 0, "sema_wait() failed");
2704
2705 // were we externally suspended while we were waiting?
2706 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2707 if (threadIsSuspended) {
2708 //
2709 // The semaphore has been incremented, but while we were waiting
2710 // another thread suspended us. We don't want to continue running
2711 // while suspended because that would surprise the thread that
2712 // suspended us.
2713 //
2714 ret = ::sema_post(&sig_sem);
2715 assert(ret == 0, "sema_post() failed");
2716
2717 thread->java_suspend_self();
2718 }
2719 } while (threadIsSuspended);
2720 }
2721 }
2722
2723 int os::signal_lookup() {
2724 return check_pending_signals(false);
2725 }
2726
2727 int os::signal_wait() {
2728 return check_pending_signals(true);
2729 }
2730
2731 ////////////////////////////////////////////////////////////////////////////////
2732 // Virtual Memory
2733
2734 static int page_size = -1;
2735
2736 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2737 // clear this var if support is not available.
2738 static bool has_map_align = true;
2739
2740 int os::vm_page_size() {
2741 assert(page_size != -1, "must call os::init");
2742 return page_size;
2743 }
2744
2745 // Solaris allocates memory by pages.
2746 int os::vm_allocation_granularity() {
2747 assert(page_size != -1, "must call os::init");
2748 return page_size;
2749 }
2750
2751 static bool recoverable_mmap_error(int err) {
2752 // See if the error is one we can let the caller handle. This
2753 // list of errno values comes from the Solaris mmap(2) man page.
2754 switch (err) {
2755 case EBADF:
2756 case EINVAL:
2757 case ENOTSUP:
2758 // let the caller deal with these errors
2759 return true;
2760
2761 default:
2762 // Any remaining errors on this OS can cause our reserved mapping
2763 // to be lost. That can cause confusion where different data
2764 // structures think they have the same memory mapped. The worst
2765 // scenario is if both the VM and a library think they have the
2766 // same memory mapped.
2767 return false;
2768 }
2769 }
2770
2771 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2772 int err) {
2773 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2774 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2775 strerror(err), err);
2776 }
2777
2778 static void warn_fail_commit_memory(char* addr, size_t bytes,
2779 size_t alignment_hint, bool exec,
2780 int err) {
2781 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2782 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2783 alignment_hint, exec, strerror(err), err);
2784 }
2785
2786 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2787 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2788 size_t size = bytes;
2789 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2790 if (res != NULL) {
2791 if (UseNUMAInterleaving) {
2792 numa_make_global(addr, bytes);
2793 }
2794 return 0;
2795 }
2796
2797 int err = errno; // save errno from mmap() call in mmap_chunk()
2798
2799 if (!recoverable_mmap_error(err)) {
2800 warn_fail_commit_memory(addr, bytes, exec, err);
2801 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2802 }
2803
2804 return err;
2805 }
2806
2807 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2808 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2809 }
2810
2811 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2812 const char* mesg) {
2813 assert(mesg != NULL, "mesg must be specified");
2814 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2815 if (err != 0) {
2816 // the caller wants all commit errors to exit with the specified mesg:
2817 warn_fail_commit_memory(addr, bytes, exec, err);
2818 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2819 }
2820 }
2821
2822 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2823 size_t alignment_hint, bool exec) {
2824 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2825 if (err == 0) {
2826 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) {
2827 // If the large page size has been set and the VM
2828 // is using large pages, use the large page size
2829 // if it is smaller than the alignment hint. This is
2830 // a case where the VM wants to use a larger alignment size
2831 // for its own reasons but still want to use large pages
2832 // (which is what matters to setting the mpss range.
2833 size_t page_size = 0;
2834 if (large_page_size() < alignment_hint) {
2835 assert(UseLargePages, "Expected to be here for large page use only");
2836 page_size = large_page_size();
2837 } else {
2838 // If the alignment hint is less than the large page
2839 // size, the VM wants a particular alignment (thus the hint)
2840 // for internal reasons. Try to set the mpss range using
2841 // the alignment_hint.
2842 page_size = alignment_hint;
2843 }
2844 // Since this is a hint, ignore any failures.
2845 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2846 }
2847 }
2848 return err;
2849 }
2850
2851 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2852 bool exec) {
2853 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2854 }
2855
2856 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2857 size_t alignment_hint, bool exec,
2858 const char* mesg) {
2859 assert(mesg != NULL, "mesg must be specified");
2860 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2861 if (err != 0) {
2862 // the caller wants all commit errors to exit with the specified mesg:
2863 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2864 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2865 }
2866 }
2867
2868 // Uncommit the pages in a specified region.
2869 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2870 if (madvise(addr, bytes, MADV_FREE) < 0) {
2871 debug_only(warning("MADV_FREE failed."));
2872 return;
2873 }
2874 }
2875
2876 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2877 return os::commit_memory(addr, size, !ExecMem);
2878 }
2879
2880 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2881 return os::uncommit_memory(addr, size);
2882 }
2883
2884 // Change the page size in a given range.
2885 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2886 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2887 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2888 if (UseLargePages) {
2889 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2890 }
2891 }
2892
2893 // Tell the OS to make the range local to the first-touching LWP
2894 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2895 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2896 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2897 debug_only(warning("MADV_ACCESS_LWP failed."));
2898 }
2899 }
2900
2901 // Tell the OS that this range would be accessed from different LWPs.
2902 void os::numa_make_global(char *addr, size_t bytes) {
2903 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2904 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2905 debug_only(warning("MADV_ACCESS_MANY failed."));
2906 }
2907 }
2908
2909 // Get the number of the locality groups.
2910 size_t os::numa_get_groups_num() {
2911 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2912 return n != -1 ? n : 1;
2913 }
2914
2915 // Get a list of leaf locality groups. A leaf lgroup is group that
2916 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2917 // board. An LWP is assigned to one of these groups upon creation.
2918 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2919 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2920 ids[0] = 0;
2921 return 1;
2922 }
2923 int result_size = 0, top = 1, bottom = 0, cur = 0;
2924 for (int k = 0; k < size; k++) {
2925 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2926 (Solaris::lgrp_id_t*)&ids[top], size - top);
2927 if (r == -1) {
2928 ids[0] = 0;
2929 return 1;
2930 }
2931 if (!r) {
2932 // That's a leaf node.
2933 assert (bottom <= cur, "Sanity check");
2934 // Check if the node has memory
2935 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2936 NULL, 0, LGRP_RSRC_MEM) > 0) {
2937 ids[bottom++] = ids[cur];
2938 }
2939 }
2940 top += r;
2941 cur++;
2942 }
2943 if (bottom == 0) {
2944 // Handle a situation, when the OS reports no memory available.
2945 // Assume UMA architecture.
2946 ids[0] = 0;
2947 return 1;
2948 }
2949 return bottom;
2950 }
2951
2952 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2953 bool os::numa_topology_changed() {
2954 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2955 if (is_stale != -1 && is_stale) {
2956 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2957 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2958 assert(c != 0, "Failure to initialize LGRP API");
2959 Solaris::set_lgrp_cookie(c);
2960 return true;
2961 }
2962 return false;
2963 }
2964
2965 // Get the group id of the current LWP.
2966 int os::numa_get_group_id() {
2967 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2968 if (lgrp_id == -1) {
2969 return 0;
2970 }
2971 const int size = os::numa_get_groups_num();
2972 int *ids = (int*)alloca(size * sizeof(int));
2973
2974 // Get the ids of all lgroups with memory; r is the count.
2975 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2976 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2977 if (r <= 0) {
2978 return 0;
2979 }
2980 return ids[os::random() % r];
2981 }
2982
2983 // Request information about the page.
2984 bool os::get_page_info(char *start, page_info* info) {
2985 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2986 uint64_t addr = (uintptr_t)start;
2987 uint64_t outdata[2];
2988 uint_t validity = 0;
2989
2990 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2991 return false;
2992 }
2993
2994 info->size = 0;
2995 info->lgrp_id = -1;
2996
2997 if ((validity & 1) != 0) {
2998 if ((validity & 2) != 0) {
2999 info->lgrp_id = outdata[0];
3000 }
3001 if ((validity & 4) != 0) {
3002 info->size = outdata[1];
3003 }
3004 return true;
3005 }
3006 return false;
3007 }
3008
3009 // Scan the pages from start to end until a page different than
3010 // the one described in the info parameter is encountered.
3011 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3012 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
3013 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
3014 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
3015 uint_t validity[MAX_MEMINFO_CNT];
3016
3017 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
3018 uint64_t p = (uint64_t)start;
3019 while (p < (uint64_t)end) {
3020 addrs[0] = p;
3021 size_t addrs_count = 1;
3022 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
3023 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
3024 addrs_count++;
3025 }
3026
3027 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
3028 return NULL;
3029 }
3030
3031 size_t i = 0;
3032 for (; i < addrs_count; i++) {
3033 if ((validity[i] & 1) != 0) {
3034 if ((validity[i] & 4) != 0) {
3035 if (outdata[types * i + 1] != page_expected->size) {
3036 break;
3037 }
3038 } else
3039 if (page_expected->size != 0) {
3040 break;
3041 }
3042
3043 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
3044 if (outdata[types * i] != page_expected->lgrp_id) {
3045 break;
3046 }
3047 }
3048 } else {
3049 return NULL;
3050 }
3051 }
3052
3053 if (i != addrs_count) {
3054 if ((validity[i] & 2) != 0) {
3055 page_found->lgrp_id = outdata[types * i];
3056 } else {
3057 page_found->lgrp_id = -1;
3058 }
3059 if ((validity[i] & 4) != 0) {
3060 page_found->size = outdata[types * i + 1];
3061 } else {
3062 page_found->size = 0;
3063 }
3064 return (char*)addrs[i];
3065 }
3066
3067 p = addrs[addrs_count - 1] + page_size;
3068 }
3069 return end;
3070 }
3071
3072 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3073 size_t size = bytes;
3074 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3075 // uncommitted page. Otherwise, the read/write might succeed if we
3076 // have enough swap space to back the physical page.
3077 return
3078 NULL != Solaris::mmap_chunk(addr, size,
3079 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
3080 PROT_NONE);
3081 }
3082
3083 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
3084 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
3085
3086 if (b == MAP_FAILED) {
3087 return NULL;
3088 }
3089 return b;
3090 }
3091
3092 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3093 char* addr = requested_addr;
3094 int flags = MAP_PRIVATE | MAP_NORESERVE;
3095
3096 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3097
3098 if (fixed) {
3099 flags |= MAP_FIXED;
3100 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3101 flags |= MAP_ALIGN;
3102 addr = (char*) alignment_hint;
3103 }
3104
3105 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3106 // uncommitted page. Otherwise, the read/write might succeed if we
3107 // have enough swap space to back the physical page.
3108 return mmap_chunk(addr, bytes, flags, PROT_NONE);
3109 }
3110
3111 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3112 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3113
3114 guarantee(requested_addr == NULL || requested_addr == addr,
3115 "OS failed to return requested mmap address.");
3116 return addr;
3117 }
3118
3119 // Reserve memory at an arbitrary address, only if that area is
3120 // available (and not reserved for something else).
3121
3122 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3123 const int max_tries = 10;
3124 char* base[max_tries];
3125 size_t size[max_tries];
3126
3127 // Solaris adds a gap between mmap'ed regions. The size of the gap
3128 // is dependent on the requested size and the MMU. Our initial gap
3129 // value here is just a guess and will be corrected later.
3130 bool had_top_overlap = false;
3131 bool have_adjusted_gap = false;
3132 size_t gap = 0x400000;
3133
3134 // Assert only that the size is a multiple of the page size, since
3135 // that's all that mmap requires, and since that's all we really know
3136 // about at this low abstraction level. If we need higher alignment,
3137 // we can either pass an alignment to this method or verify alignment
3138 // in one of the methods further up the call chain. See bug 5044738.
3139 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3140
3141 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3142 // Give it a try, if the kernel honors the hint we can return immediately.
3143 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3144
3145 volatile int err = errno;
3146 if (addr == requested_addr) {
3147 return addr;
3148 } else if (addr != NULL) {
3149 pd_unmap_memory(addr, bytes);
3150 }
3151
3152 if (PrintMiscellaneous && Verbose) {
3153 char buf[256];
3154 buf[0] = '\0';
3155 if (addr == NULL) {
3156 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3157 }
3158 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3159 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3160 "%s", bytes, requested_addr, addr, buf);
3161 }
3162
3163 // Address hint method didn't work. Fall back to the old method.
3164 // In theory, once SNV becomes our oldest supported platform, this
3165 // code will no longer be needed.
3166 //
3167 // Repeatedly allocate blocks until the block is allocated at the
3168 // right spot. Give up after max_tries.
3169 int i;
3170 for (i = 0; i < max_tries; ++i) {
3171 base[i] = reserve_memory(bytes);
3172
3173 if (base[i] != NULL) {
3174 // Is this the block we wanted?
3175 if (base[i] == requested_addr) {
3176 size[i] = bytes;
3177 break;
3178 }
3179
3180 // check that the gap value is right
3181 if (had_top_overlap && !have_adjusted_gap) {
3182 size_t actual_gap = base[i-1] - base[i] - bytes;
3183 if (gap != actual_gap) {
3184 // adjust the gap value and retry the last 2 allocations
3185 assert(i > 0, "gap adjustment code problem");
3186 have_adjusted_gap = true; // adjust the gap only once, just in case
3187 gap = actual_gap;
3188 if (PrintMiscellaneous && Verbose) {
3189 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3190 }
3191 unmap_memory(base[i], bytes);
3192 unmap_memory(base[i-1], size[i-1]);
3193 i-=2;
3194 continue;
3195 }
3196 }
3197
3198 // Does this overlap the block we wanted? Give back the overlapped
3199 // parts and try again.
3200 //
3201 // There is still a bug in this code: if top_overlap == bytes,
3202 // the overlap is offset from requested region by the value of gap.
3203 // In this case giving back the overlapped part will not work,
3204 // because we'll give back the entire block at base[i] and
3205 // therefore the subsequent allocation will not generate a new gap.
3206 // This could be fixed with a new algorithm that used larger
3207 // or variable size chunks to find the requested region -
3208 // but such a change would introduce additional complications.
3209 // It's rare enough that the planets align for this bug,
3210 // so we'll just wait for a fix for 6204603/5003415 which
3211 // will provide a mmap flag to allow us to avoid this business.
3212
3213 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3214 if (top_overlap >= 0 && top_overlap < bytes) {
3215 had_top_overlap = true;
3216 unmap_memory(base[i], top_overlap);
3217 base[i] += top_overlap;
3218 size[i] = bytes - top_overlap;
3219 } else {
3220 size_t bottom_overlap = base[i] + bytes - requested_addr;
3221 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3222 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3223 warning("attempt_reserve_memory_at: possible alignment bug");
3224 }
3225 unmap_memory(requested_addr, bottom_overlap);
3226 size[i] = bytes - bottom_overlap;
3227 } else {
3228 size[i] = bytes;
3229 }
3230 }
3231 }
3232 }
3233
3234 // Give back the unused reserved pieces.
3235
3236 for (int j = 0; j < i; ++j) {
3237 if (base[j] != NULL) {
3238 unmap_memory(base[j], size[j]);
3239 }
3240 }
3241
3242 return (i < max_tries) ? requested_addr : NULL;
3243 }
3244
3245 bool os::pd_release_memory(char* addr, size_t bytes) {
3246 size_t size = bytes;
3247 return munmap(addr, size) == 0;
3248 }
3249
3250 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3251 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3252 "addr must be page aligned");
3253 int retVal = mprotect(addr, bytes, prot);
3254 return retVal == 0;
3255 }
3256
3257 // Protect memory (Used to pass readonly pages through
3258 // JNI GetArray<type>Elements with empty arrays.)
3259 // Also, used for serialization page and for compressed oops null pointer
3260 // checking.
3261 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3262 bool is_committed) {
3263 unsigned int p = 0;
3264 switch (prot) {
3265 case MEM_PROT_NONE: p = PROT_NONE; break;
3266 case MEM_PROT_READ: p = PROT_READ; break;
3267 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3268 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3269 default:
3270 ShouldNotReachHere();
3271 }
3272 // is_committed is unused.
3273 return solaris_mprotect(addr, bytes, p);
3274 }
3275
3276 // guard_memory and unguard_memory only happens within stack guard pages.
3277 // Since ISM pertains only to the heap, guard and unguard memory should not
3278 /// happen with an ISM region.
3279 bool os::guard_memory(char* addr, size_t bytes) {
3280 return solaris_mprotect(addr, bytes, PROT_NONE);
3281 }
3282
3283 bool os::unguard_memory(char* addr, size_t bytes) {
3284 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3285 }
3286
3287 // Large page support
3288 static size_t _large_page_size = 0;
3289
3290 // Insertion sort for small arrays (descending order).
3291 static void insertion_sort_descending(size_t* array, int len) {
3292 for (int i = 0; i < len; i++) {
3293 size_t val = array[i];
3294 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3295 size_t tmp = array[key];
3296 array[key] = array[key - 1];
3297 array[key - 1] = tmp;
3298 }
3299 }
3300 }
3301
3302 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3303 const unsigned int usable_count = VM_Version::page_size_count();
3304 if (usable_count == 1) {
3305 return false;
3306 }
3307
3308 // Find the right getpagesizes interface. When solaris 11 is the minimum
3309 // build platform, getpagesizes() (without the '2') can be called directly.
3310 typedef int (*gps_t)(size_t[], int);
3311 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3312 if (gps_func == NULL) {
3313 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3314 if (gps_func == NULL) {
3315 if (warn) {
3316 warning("MPSS is not supported by the operating system.");
3317 }
3318 return false;
3319 }
3320 }
3321
3322 // Fill the array of page sizes.
3323 int n = (*gps_func)(_page_sizes, page_sizes_max);
3324 assert(n > 0, "Solaris bug?");
3325
3326 if (n == page_sizes_max) {
3327 // Add a sentinel value (necessary only if the array was completely filled
3328 // since it is static (zeroed at initialization)).
3329 _page_sizes[--n] = 0;
3330 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3331 }
3332 assert(_page_sizes[n] == 0, "missing sentinel");
3333 trace_page_sizes("available page sizes", _page_sizes, n);
3334
3335 if (n == 1) return false; // Only one page size available.
3336
3337 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3338 // select up to usable_count elements. First sort the array, find the first
3339 // acceptable value, then copy the usable sizes to the top of the array and
3340 // trim the rest. Make sure to include the default page size :-).
3341 //
3342 // A better policy could get rid of the 4M limit by taking the sizes of the
3343 // important VM memory regions (java heap and possibly the code cache) into
3344 // account.
3345 insertion_sort_descending(_page_sizes, n);
3346 const size_t size_limit =
3347 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3348 int beg;
3349 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3350 const int end = MIN2((int)usable_count, n) - 1;
3351 for (int cur = 0; cur < end; ++cur, ++beg) {
3352 _page_sizes[cur] = _page_sizes[beg];
3353 }
3354 _page_sizes[end] = vm_page_size();
3355 _page_sizes[end + 1] = 0;
3356
3357 if (_page_sizes[end] > _page_sizes[end - 1]) {
3358 // Default page size is not the smallest; sort again.
3359 insertion_sort_descending(_page_sizes, end + 1);
3360 }
3361 *page_size = _page_sizes[0];
3362
3363 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3364 return true;
3365 }
3366
3367 void os::large_page_init() {
3368 if (UseLargePages) {
3369 // print a warning if any large page related flag is specified on command line
3370 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3371 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3372
3373 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3374 }
3375 }
3376
3377 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3378 // Signal to OS that we want large pages for addresses
3379 // from addr, addr + bytes
3380 struct memcntl_mha mpss_struct;
3381 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3382 mpss_struct.mha_pagesize = align;
3383 mpss_struct.mha_flags = 0;
3384 // Upon successful completion, memcntl() returns 0
3385 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3386 debug_only(warning("Attempt to use MPSS failed."));
3387 return false;
3388 }
3389 return true;
3390 }
3391
3392 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3393 fatal("os::reserve_memory_special should not be called on Solaris.");
3394 return NULL;
3395 }
3396
3397 bool os::release_memory_special(char* base, size_t bytes) {
3398 fatal("os::release_memory_special should not be called on Solaris.");
3399 return false;
3400 }
3401
3402 size_t os::large_page_size() {
3403 return _large_page_size;
3404 }
3405
3406 // MPSS allows application to commit large page memory on demand; with ISM
3407 // the entire memory region must be allocated as shared memory.
3408 bool os::can_commit_large_page_memory() {
3409 return true;
3410 }
3411
3412 bool os::can_execute_large_page_memory() {
3413 return true;
3414 }
3415
3416 static int os_sleep(jlong millis, bool interruptible) {
3417 const jlong limit = INT_MAX;
3418 jlong prevtime;
3419 int res;
3420
3421 while (millis > limit) {
3422 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3423 return res;
3424 millis -= limit;
3425 }
3426
3427 // Restart interrupted polls with new parameters until the proper delay
3428 // has been completed.
3429
3430 prevtime = getTimeMillis();
3431
3432 while (millis > 0) {
3433 jlong newtime;
3434
3435 if (!interruptible) {
3436 // Following assert fails for os::yield_all:
3437 // assert(!thread->is_Java_thread(), "must not be java thread");
3438 res = poll(NULL, 0, millis);
3439 } else {
3440 JavaThread *jt = JavaThread::current();
3441
3442 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3443 os::Solaris::clear_interrupted);
3444 }
3445
3446 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3447 // thread.Interrupt.
3448
3449 // See c/r 6751923. Poll can return 0 before time
3450 // has elapsed if time is set via clock_settime (as NTP does).
3451 // res == 0 if poll timed out (see man poll RETURN VALUES)
3452 // using the logic below checks that we really did
3453 // sleep at least "millis" if not we'll sleep again.
3454 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3455 newtime = getTimeMillis();
3456 assert(newtime >= prevtime, "time moving backwards");
3457 /* Doing prevtime and newtime in microseconds doesn't help precision,
3458 and trying to round up to avoid lost milliseconds can result in a
3459 too-short delay. */
3460 millis -= newtime - prevtime;
3461 if(millis <= 0)
3462 return OS_OK;
3463 prevtime = newtime;
3464 } else
3465 return res;
3466 }
3467
3468 return OS_OK;
3469 }
3470
3471 // Read calls from inside the vm need to perform state transitions
3472 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3473 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3474 }
3475
3476 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3477 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3478 }
3479
3480 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3481 assert(thread == Thread::current(), "thread consistency check");
3482
3483 // TODO-FIXME: this should be removed.
3484 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3485 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3486 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3487 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3488 // is fooled into believing that the system is making progress. In the code below we block the
3489 // the watcher thread while safepoint is in progress so that it would not appear as though the
3490 // system is making progress.
3491 if (!Solaris::T2_libthread() &&
3492 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3493 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3494 // the entire safepoint, the watcher thread will line up here during the safepoint.
3495 Threads_lock->lock_without_safepoint_check();
3496 Threads_lock->unlock();
3497 }
3498
3499 if (thread->is_Java_thread()) {
3500 // This is a JavaThread so we honor the _thread_blocked protocol
3501 // even for sleeps of 0 milliseconds. This was originally done
3502 // as a workaround for bug 4338139. However, now we also do it
3503 // to honor the suspend-equivalent protocol.
3504
3505 JavaThread *jt = (JavaThread *) thread;
3506 ThreadBlockInVM tbivm(jt);
3507
3508 jt->set_suspend_equivalent();
3509 // cleared by handle_special_suspend_equivalent_condition() or
3510 // java_suspend_self() via check_and_wait_while_suspended()
3511
3512 int ret_code;
3513 if (millis <= 0) {
3514 thr_yield();
3515 ret_code = 0;
3516 } else {
3517 // The original sleep() implementation did not create an
3518 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3519 // I'm preserving that decision for now.
3520 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3521
3522 ret_code = os_sleep(millis, interruptible);
3523 }
3524
3525 // were we externally suspended while we were waiting?
3526 jt->check_and_wait_while_suspended();
3527
3528 return ret_code;
3529 }
3530
3531 // non-JavaThread from this point on:
3532
3533 if (millis <= 0) {
3534 thr_yield();
3535 return 0;
3536 }
3537
3538 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3539
3540 return os_sleep(millis, interruptible);
3541 }
3542
3543 int os::naked_sleep() {
3544 // %% make the sleep time an integer flag. for now use 1 millisec.
3545 return os_sleep(1, false);
3546 }
3547
3548 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3549 void os::infinite_sleep() {
3550 while (true) { // sleep forever ...
3551 ::sleep(100); // ... 100 seconds at a time
3552 }
3553 }
3554
3555 // Used to convert frequent JVM_Yield() to nops
3556 bool os::dont_yield() {
3557 if (DontYieldALot) {
3558 static hrtime_t last_time = 0;
3559 hrtime_t diff = getTimeNanos() - last_time;
3560
3561 if (diff < DontYieldALotInterval * 1000000)
3562 return true;
3563
3564 last_time += diff;
3565
3566 return false;
3567 }
3568 else {
3569 return false;
3570 }
3571 }
3572
3573 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3574 // the linux and win32 implementations do not. This should be checked.
3575
3576 void os::yield() {
3577 // Yields to all threads with same or greater priority
3578 os::sleep(Thread::current(), 0, false);
3579 }
3580
3581 // Note that yield semantics are defined by the scheduling class to which
3582 // the thread currently belongs. Typically, yield will _not yield to
3583 // other equal or higher priority threads that reside on the dispatch queues
3584 // of other CPUs.
3585
3586 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3587
3588
3589 // On Solaris we found that yield_all doesn't always yield to all other threads.
3590 // There have been cases where there is a thread ready to execute but it doesn't
3591 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3592 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3593 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3594 // number of times yield_all is called in the one loop and increase the sleep
3595 // time after 8 attempts. If this fails too we increase the concurrency level
3596 // so that the starving thread would get an lwp
3597
3598 void os::yield_all(int attempts) {
3599 // Yields to all threads, including threads with lower priorities
3600 if (attempts == 0) {
3601 os::sleep(Thread::current(), 1, false);
3602 } else {
3603 int iterations = attempts % 30;
3604 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3605 // thr_setconcurrency and _getconcurrency make sense only under T1.
3606 int noofLWPS = thr_getconcurrency();
3607 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3608 thr_setconcurrency(thr_getconcurrency() + 1);
3609 }
3610 } else if (iterations < 25) {
3611 os::sleep(Thread::current(), 1, false);
3612 } else {
3613 os::sleep(Thread::current(), 10, false);
3614 }
3615 }
3616 }
3617
3618 // Called from the tight loops to possibly influence time-sharing heuristics
3619 void os::loop_breaker(int attempts) {
3620 os::yield_all(attempts);
3621 }
3622
3623
3624 // Interface for setting lwp priorities. If we are using T2 libthread,
3625 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3626 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3627 // function is meaningless in this mode so we must adjust the real lwp's priority
3628 // The routines below implement the getting and setting of lwp priorities.
3629 //
3630 // Note: There are three priority scales used on Solaris. Java priotities
3631 // which range from 1 to 10, libthread "thr_setprio" scale which range
3632 // from 0 to 127, and the current scheduling class of the process we
3633 // are running in. This is typically from -60 to +60.
3634 // The setting of the lwp priorities in done after a call to thr_setprio
3635 // so Java priorities are mapped to libthread priorities and we map from
3636 // the latter to lwp priorities. We don't keep priorities stored in
3637 // Java priorities since some of our worker threads want to set priorities
3638 // higher than all Java threads.
3639 //
3640 // For related information:
3641 // (1) man -s 2 priocntl
3642 // (2) man -s 4 priocntl
3643 // (3) man dispadmin
3644 // = librt.so
3645 // = libthread/common/rtsched.c - thrp_setlwpprio().
3646 // = ps -cL <pid> ... to validate priority.
3647 // = sched_get_priority_min and _max
3648 // pthread_create
3649 // sched_setparam
3650 // pthread_setschedparam
3651 //
3652 // Assumptions:
3653 // + We assume that all threads in the process belong to the same
3654 // scheduling class. IE. an homogenous process.
3655 // + Must be root or in IA group to change change "interactive" attribute.
3656 // Priocntl() will fail silently. The only indication of failure is when
3657 // we read-back the value and notice that it hasn't changed.
3658 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3659 // + For RT, change timeslice as well. Invariant:
3660 // constant "priority integral"
3661 // Konst == TimeSlice * (60-Priority)
3662 // Given a priority, compute appropriate timeslice.
3663 // + Higher numerical values have higher priority.
3664
3665 // sched class attributes
3666 typedef struct {
3667 int schedPolicy; // classID
3668 int maxPrio;
3669 int minPrio;
3670 } SchedInfo;
3671
3672
3673 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3674
3675 #ifdef ASSERT
3676 static int ReadBackValidate = 1;
3677 #endif
3678 static int myClass = 0;
3679 static int myMin = 0;
3680 static int myMax = 0;
3681 static int myCur = 0;
3682 static bool priocntl_enable = false;
3683
3684 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3685 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3686
3687
3688 // lwp_priocntl_init
3689 //
3690 // Try to determine the priority scale for our process.
3691 //
3692 // Return errno or 0 if OK.
3693 //
3694 static int lwp_priocntl_init () {
3695 int rslt;
3696 pcinfo_t ClassInfo;
3697 pcparms_t ParmInfo;
3698 int i;
3699
3700 if (!UseThreadPriorities) return 0;
3701
3702 // We are using Bound threads, we need to determine our priority ranges
3703 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3704 // If ThreadPriorityPolicy is 1, switch tables
3705 if (ThreadPriorityPolicy == 1) {
3706 for (i = 0 ; i < CriticalPriority+1; i++)
3707 os::java_to_os_priority[i] = prio_policy1[i];
3708 }
3709 if (UseCriticalJavaThreadPriority) {
3710 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3711 // See set_native_priority() and set_lwp_class_and_priority().
3712 // Save original MaxPriority mapping in case attempt to
3713 // use critical priority fails.
3714 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3715 // Set negative to distinguish from other priorities
3716 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3717 }
3718 }
3719 // Not using Bound Threads, set to ThreadPolicy 1
3720 else {
3721 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3722 os::java_to_os_priority[i] = prio_policy1[i];
3723 }
3724 return 0;
3725 }
3726
3727 // Get IDs for a set of well-known scheduling classes.
3728 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3729 // the system. We should have a loop that iterates over the
3730 // classID values, which are known to be "small" integers.
3731
3732 strcpy(ClassInfo.pc_clname, "TS");
3733 ClassInfo.pc_cid = -1;
3734 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3735 if (rslt < 0) return errno;
3736 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3737 tsLimits.schedPolicy = ClassInfo.pc_cid;
3738 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3739 tsLimits.minPrio = -tsLimits.maxPrio;
3740
3741 strcpy(ClassInfo.pc_clname, "IA");
3742 ClassInfo.pc_cid = -1;
3743 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3744 if (rslt < 0) return errno;
3745 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3746 iaLimits.schedPolicy = ClassInfo.pc_cid;
3747 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3748 iaLimits.minPrio = -iaLimits.maxPrio;
3749
3750 strcpy(ClassInfo.pc_clname, "RT");
3751 ClassInfo.pc_cid = -1;
3752 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3753 if (rslt < 0) return errno;
3754 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3755 rtLimits.schedPolicy = ClassInfo.pc_cid;
3756 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3757 rtLimits.minPrio = 0;
3758
3759 strcpy(ClassInfo.pc_clname, "FX");
3760 ClassInfo.pc_cid = -1;
3761 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3762 if (rslt < 0) return errno;
3763 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3764 fxLimits.schedPolicy = ClassInfo.pc_cid;
3765 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3766 fxLimits.minPrio = 0;
3767
3768 // Query our "current" scheduling class.
3769 // This will normally be IA, TS or, rarely, FX or RT.
3770 memset(&ParmInfo, 0, sizeof(ParmInfo));
3771 ParmInfo.pc_cid = PC_CLNULL;
3772 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3773 if (rslt < 0) return errno;
3774 myClass = ParmInfo.pc_cid;
3775
3776 // We now know our scheduling classId, get specific information
3777 // about the class.
3778 ClassInfo.pc_cid = myClass;
3779 ClassInfo.pc_clname[0] = 0;
3780 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3781 if (rslt < 0) return errno;
3782
3783 if (ThreadPriorityVerbose) {
3784 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3785 }
3786
3787 memset(&ParmInfo, 0, sizeof(pcparms_t));
3788 ParmInfo.pc_cid = PC_CLNULL;
3789 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3790 if (rslt < 0) return errno;
3791
3792 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3793 myMin = rtLimits.minPrio;
3794 myMax = rtLimits.maxPrio;
3795 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3796 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3797 myMin = iaLimits.minPrio;
3798 myMax = iaLimits.maxPrio;
3799 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3800 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3801 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3802 myMin = tsLimits.minPrio;
3803 myMax = tsLimits.maxPrio;
3804 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3805 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3806 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3807 myMin = fxLimits.minPrio;
3808 myMax = fxLimits.maxPrio;
3809 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3810 } else {
3811 // No clue - punt
3812 if (ThreadPriorityVerbose)
3813 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3814 return EINVAL; // no clue, punt
3815 }
3816
3817 if (ThreadPriorityVerbose) {
3818 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3819 }
3820
3821 priocntl_enable = true; // Enable changing priorities
3822 return 0;
3823 }
3824
3825 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3826 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3827 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3828 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3829
3830
3831 // scale_to_lwp_priority
3832 //
3833 // Convert from the libthread "thr_setprio" scale to our current
3834 // lwp scheduling class scale.
3835 //
3836 static
3837 int scale_to_lwp_priority (int rMin, int rMax, int x)
3838 {
3839 int v;
3840
3841 if (x == 127) return rMax; // avoid round-down
3842 v = (((x*(rMax-rMin)))/128)+rMin;
3843 return v;
3844 }
3845
3846
3847 // set_lwp_class_and_priority
3848 //
3849 // Set the class and priority of the lwp. This call should only
3850 // be made when using bound threads (T2 threads are bound by default).
3851 //
3852 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3853 int newPrio, int new_class, bool scale) {
3854 int rslt;
3855 int Actual, Expected, prv;
3856 pcparms_t ParmInfo; // for GET-SET
3857 #ifdef ASSERT
3858 pcparms_t ReadBack; // for readback
3859 #endif
3860
3861 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3862 // Query current values.
3863 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3864 // Cache "pcparms_t" in global ParmCache.
3865 // TODO: elide set-to-same-value
3866
3867 // If something went wrong on init, don't change priorities.
3868 if ( !priocntl_enable ) {
3869 if (ThreadPriorityVerbose)
3870 tty->print_cr("Trying to set priority but init failed, ignoring");
3871 return EINVAL;
3872 }
3873
3874 // If lwp hasn't started yet, just return
3875 // the _start routine will call us again.
3876 if ( lwpid <= 0 ) {
3877 if (ThreadPriorityVerbose) {
3878 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3879 INTPTR_FORMAT " to %d, lwpid not set",
3880 ThreadID, newPrio);
3881 }
3882 return 0;
3883 }
3884
3885 if (ThreadPriorityVerbose) {
3886 tty->print_cr ("set_lwp_class_and_priority("
3887 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3888 ThreadID, lwpid, newPrio);
3889 }
3890
3891 memset(&ParmInfo, 0, sizeof(pcparms_t));
3892 ParmInfo.pc_cid = PC_CLNULL;
3893 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3894 if (rslt < 0) return errno;
3895
3896 int cur_class = ParmInfo.pc_cid;
3897 ParmInfo.pc_cid = (id_t)new_class;
3898
3899 if (new_class == rtLimits.schedPolicy) {
3900 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3901 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3902 rtLimits.maxPrio, newPrio)
3903 : newPrio;
3904 rtInfo->rt_tqsecs = RT_NOCHANGE;
3905 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3906 if (ThreadPriorityVerbose) {
3907 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3908 }
3909 } else if (new_class == iaLimits.schedPolicy) {
3910 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3911 int maxClamped = MIN2(iaLimits.maxPrio,
3912 cur_class == new_class
3913 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3914 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3915 maxClamped, newPrio)
3916 : newPrio;
3917 iaInfo->ia_uprilim = cur_class == new_class
3918 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3919 iaInfo->ia_mode = IA_NOCHANGE;
3920 if (ThreadPriorityVerbose) {
3921 tty->print_cr("IA: [%d...%d] %d->%d\n",
3922 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3923 }
3924 } else if (new_class == tsLimits.schedPolicy) {
3925 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3926 int maxClamped = MIN2(tsLimits.maxPrio,
3927 cur_class == new_class
3928 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3929 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3930 maxClamped, newPrio)
3931 : newPrio;
3932 tsInfo->ts_uprilim = cur_class == new_class
3933 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3934 if (ThreadPriorityVerbose) {
3935 tty->print_cr("TS: [%d...%d] %d->%d\n",
3936 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3937 }
3938 } else if (new_class == fxLimits.schedPolicy) {
3939 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3940 int maxClamped = MIN2(fxLimits.maxPrio,
3941 cur_class == new_class
3942 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3943 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3944 maxClamped, newPrio)
3945 : newPrio;
3946 fxInfo->fx_uprilim = cur_class == new_class
3947 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3948 fxInfo->fx_tqsecs = FX_NOCHANGE;
3949 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3950 if (ThreadPriorityVerbose) {
3951 tty->print_cr("FX: [%d...%d] %d->%d\n",
3952 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3953 }
3954 } else {
3955 if (ThreadPriorityVerbose) {
3956 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3957 }
3958 return EINVAL; // no clue, punt
3959 }
3960
3961 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3962 if (ThreadPriorityVerbose && rslt) {
3963 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3964 }
3965 if (rslt < 0) return errno;
3966
3967 #ifdef ASSERT
3968 // Sanity check: read back what we just attempted to set.
3969 // In theory it could have changed in the interim ...
3970 //
3971 // The priocntl system call is tricky.
3972 // Sometimes it'll validate the priority value argument and
3973 // return EINVAL if unhappy. At other times it fails silently.
3974 // Readbacks are prudent.
3975
3976 if (!ReadBackValidate) return 0;
3977
3978 memset(&ReadBack, 0, sizeof(pcparms_t));
3979 ReadBack.pc_cid = PC_CLNULL;
3980 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3981 assert(rslt >= 0, "priocntl failed");
3982 Actual = Expected = 0xBAD;
3983 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3984 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3985 Actual = RTPRI(ReadBack)->rt_pri;
3986 Expected = RTPRI(ParmInfo)->rt_pri;
3987 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3988 Actual = IAPRI(ReadBack)->ia_upri;
3989 Expected = IAPRI(ParmInfo)->ia_upri;
3990 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3991 Actual = TSPRI(ReadBack)->ts_upri;
3992 Expected = TSPRI(ParmInfo)->ts_upri;
3993 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3994 Actual = FXPRI(ReadBack)->fx_upri;
3995 Expected = FXPRI(ParmInfo)->fx_upri;
3996 } else {
3997 if (ThreadPriorityVerbose) {
3998 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3999 ParmInfo.pc_cid);
4000 }
4001 }
4002
4003 if (Actual != Expected) {
4004 if (ThreadPriorityVerbose) {
4005 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
4006 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
4007 }
4008 }
4009 #endif
4010
4011 return 0;
4012 }
4013
4014 // Solaris only gives access to 128 real priorities at a time,
4015 // so we expand Java's ten to fill this range. This would be better
4016 // if we dynamically adjusted relative priorities.
4017 //
4018 // The ThreadPriorityPolicy option allows us to select 2 different
4019 // priority scales.
4020 //
4021 // ThreadPriorityPolicy=0
4022 // Since the Solaris' default priority is MaximumPriority, we do not
4023 // set a priority lower than Max unless a priority lower than
4024 // NormPriority is requested.
4025 //
4026 // ThreadPriorityPolicy=1
4027 // This mode causes the priority table to get filled with
4028 // linear values. NormPriority get's mapped to 50% of the
4029 // Maximum priority an so on. This will cause VM threads
4030 // to get unfair treatment against other Solaris processes
4031 // which do not explicitly alter their thread priorities.
4032 //
4033
4034 int os::java_to_os_priority[CriticalPriority + 1] = {
4035 -99999, // 0 Entry should never be used
4036
4037 0, // 1 MinPriority
4038 32, // 2
4039 64, // 3
4040
4041 96, // 4
4042 127, // 5 NormPriority
4043 127, // 6
4044
4045 127, // 7
4046 127, // 8
4047 127, // 9 NearMaxPriority
4048
4049 127, // 10 MaxPriority
4050
4051 -criticalPrio // 11 CriticalPriority
4052 };
4053
4054 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4055 OSThread* osthread = thread->osthread();
4056
4057 // Save requested priority in case the thread hasn't been started
4058 osthread->set_native_priority(newpri);
4059
4060 // Check for critical priority request
4061 bool fxcritical = false;
4062 if (newpri == -criticalPrio) {
4063 fxcritical = true;
4064 newpri = criticalPrio;
4065 }
4066
4067 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4068 if (!UseThreadPriorities) return OS_OK;
4069
4070 int status = 0;
4071
4072 if (!fxcritical) {
4073 // Use thr_setprio only if we have a priority that thr_setprio understands
4074 status = thr_setprio(thread->osthread()->thread_id(), newpri);
4075 }
4076
4077 if (os::Solaris::T2_libthread() ||
4078 (UseBoundThreads && osthread->is_vm_created())) {
4079 int lwp_status =
4080 set_lwp_class_and_priority(osthread->thread_id(),
4081 osthread->lwp_id(),
4082 newpri,
4083 fxcritical ? fxLimits.schedPolicy : myClass,
4084 !fxcritical);
4085 if (lwp_status != 0 && fxcritical) {
4086 // Try again, this time without changing the scheduling class
4087 newpri = java_MaxPriority_to_os_priority;
4088 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
4089 osthread->lwp_id(),
4090 newpri, myClass, false);
4091 }
4092 status |= lwp_status;
4093 }
4094 return (status == 0) ? OS_OK : OS_ERR;
4095 }
4096
4097
4098 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4099 int p;
4100 if ( !UseThreadPriorities ) {
4101 *priority_ptr = NormalPriority;
4102 return OS_OK;
4103 }
4104 int status = thr_getprio(thread->osthread()->thread_id(), &p);
4105 if (status != 0) {
4106 return OS_ERR;
4107 }
4108 *priority_ptr = p;
4109 return OS_OK;
4110 }
4111
4112
4113 // Hint to the underlying OS that a task switch would not be good.
4114 // Void return because it's a hint and can fail.
4115 void os::hint_no_preempt() {
4116 schedctl_start(schedctl_init());
4117 }
4118
4119 static void resume_clear_context(OSThread *osthread) {
4120 osthread->set_ucontext(NULL);
4121 }
4122
4123 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
4124 osthread->set_ucontext(context);
4125 }
4126
4127 static Semaphore sr_semaphore;
4128
4129 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
4130 // Save and restore errno to avoid confusing native code with EINTR
4131 // after sigsuspend.
4132 int old_errno = errno;
4133
4134 OSThread* osthread = thread->osthread();
4135 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
4136
4137 os::SuspendResume::State current = osthread->sr.state();
4138 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
4139 suspend_save_context(osthread, uc);
4140
4141 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
4142 os::SuspendResume::State state = osthread->sr.suspended();
4143 if (state == os::SuspendResume::SR_SUSPENDED) {
4144 sigset_t suspend_set; // signals for sigsuspend()
4145
4146 // get current set of blocked signals and unblock resume signal
4147 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
4148 sigdelset(&suspend_set, os::Solaris::SIGasync());
4149
4150 sr_semaphore.signal();
4151 // wait here until we are resumed
4152 while (1) {
4153 sigsuspend(&suspend_set);
4154
4155 os::SuspendResume::State result = osthread->sr.running();
4156 if (result == os::SuspendResume::SR_RUNNING) {
4157 sr_semaphore.signal();
4158 break;
4159 }
4160 }
4161
4162 } else if (state == os::SuspendResume::SR_RUNNING) {
4163 // request was cancelled, continue
4164 } else {
4165 ShouldNotReachHere();
4166 }
4167
4168 resume_clear_context(osthread);
4169 } else if (current == os::SuspendResume::SR_RUNNING) {
4170 // request was cancelled, continue
4171 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
4172 // ignore
4173 } else {
4174 // ignore
4175 }
4176
4177 errno = old_errno;
4178 }
4179
4180
4181 void os::interrupt(Thread* thread) {
4182 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4183
4184 OSThread* osthread = thread->osthread();
4185
4186 int isInterrupted = osthread->interrupted();
4187 if (!isInterrupted) {
4188 osthread->set_interrupted(true);
4189 OrderAccess::fence();
4190 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4191 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4192 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4193 ParkEvent * const slp = thread->_SleepEvent ;
4194 if (slp != NULL) slp->unpark() ;
4195 }
4196
4197 // For JSR166: unpark after setting status but before thr_kill -dl
4198 if (thread->is_Java_thread()) {
4199 ((JavaThread*)thread)->parker()->unpark();
4200 }
4201
4202 // Handle interruptible wait() ...
4203 ParkEvent * const ev = thread->_ParkEvent ;
4204 if (ev != NULL) ev->unpark() ;
4205
4206 // When events are used everywhere for os::sleep, then this thr_kill
4207 // will only be needed if UseVMInterruptibleIO is true.
4208
4209 if (!isInterrupted) {
4210 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4211 assert_status(status == 0, status, "thr_kill");
4212
4213 // Bump thread interruption counter
4214 RuntimeService::record_thread_interrupt_signaled_count();
4215 }
4216 }
4217
4218
4219 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4220 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4221
4222 OSThread* osthread = thread->osthread();
4223
4224 bool res = osthread->interrupted();
4225
4226 // NOTE that since there is no "lock" around these two operations,
4227 // there is the possibility that the interrupted flag will be
4228 // "false" but that the interrupt event will be set. This is
4229 // intentional. The effect of this is that Object.wait() will appear
4230 // to have a spurious wakeup, which is not harmful, and the
4231 // possibility is so rare that it is not worth the added complexity
4232 // to add yet another lock. It has also been recommended not to put
4233 // the interrupted flag into the os::Solaris::Event structure,
4234 // because it hides the issue.
4235 if (res && clear_interrupted) {
4236 osthread->set_interrupted(false);
4237 }
4238 return res;
4239 }
4240
4241
4242 void os::print_statistics() {
4243 }
4244
4245 int os::message_box(const char* title, const char* message) {
4246 int i;
4247 fdStream err(defaultStream::error_fd());
4248 for (i = 0; i < 78; i++) err.print_raw("=");
4249 err.cr();
4250 err.print_raw_cr(title);
4251 for (i = 0; i < 78; i++) err.print_raw("-");
4252 err.cr();
4253 err.print_raw_cr(message);
4254 for (i = 0; i < 78; i++) err.print_raw("=");
4255 err.cr();
4256
4257 char buf[16];
4258 // Prevent process from exiting upon "read error" without consuming all CPU
4259 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4260
4261 return buf[0] == 'y' || buf[0] == 'Y';
4262 }
4263
4264 static int sr_notify(OSThread* osthread) {
4265 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4266 assert_status(status == 0, status, "thr_kill");
4267 return status;
4268 }
4269
4270 // "Randomly" selected value for how long we want to spin
4271 // before bailing out on suspending a thread, also how often
4272 // we send a signal to a thread we want to resume
4273 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4274 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4275
4276 static bool do_suspend(OSThread* osthread) {
4277 assert(osthread->sr.is_running(), "thread should be running");
4278 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4279
4280 // mark as suspended and send signal
4281 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4282 // failed to switch, state wasn't running?
4283 ShouldNotReachHere();
4284 return false;
4285 }
4286
4287 if (sr_notify(osthread) != 0) {
4288 ShouldNotReachHere();
4289 }
4290
4291 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4292 while (true) {
4293 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4294 break;
4295 } else {
4296 // timeout
4297 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4298 if (cancelled == os::SuspendResume::SR_RUNNING) {
4299 return false;
4300 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4301 // make sure that we consume the signal on the semaphore as well
4302 sr_semaphore.wait();
4303 break;
4304 } else {
4305 ShouldNotReachHere();
4306 return false;
4307 }
4308 }
4309 }
4310
4311 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4312 return true;
4313 }
4314
4315 static void do_resume(OSThread* osthread) {
4316 assert(osthread->sr.is_suspended(), "thread should be suspended");
4317 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4318
4319 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4320 // failed to switch to WAKEUP_REQUEST
4321 ShouldNotReachHere();
4322 return;
4323 }
4324
4325 while (true) {
4326 if (sr_notify(osthread) == 0) {
4327 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4328 if (osthread->sr.is_running()) {
4329 return;
4330 }
4331 }
4332 } else {
4333 ShouldNotReachHere();
4334 }
4335 }
4336
4337 guarantee(osthread->sr.is_running(), "Must be running!");
4338 }
4339
4340 void os::SuspendedThreadTask::internal_do_task() {
4341 if (do_suspend(_thread->osthread())) {
4342 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4343 do_task(context);
4344 do_resume(_thread->osthread());
4345 }
4346 }
4347
4348 class PcFetcher : public os::SuspendedThreadTask {
4349 public:
4350 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4351 ExtendedPC result();
4352 protected:
4353 void do_task(const os::SuspendedThreadTaskContext& context);
4354 private:
4355 ExtendedPC _epc;
4356 };
4357
4358 ExtendedPC PcFetcher::result() {
4359 guarantee(is_done(), "task is not done yet.");
4360 return _epc;
4361 }
4362
4363 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4364 Thread* thread = context.thread();
4365 OSThread* osthread = thread->osthread();
4366 if (osthread->ucontext() != NULL) {
4367 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4368 } else {
4369 // NULL context is unexpected, double-check this is the VMThread
4370 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4371 }
4372 }
4373
4374 // A lightweight implementation that does not suspend the target thread and
4375 // thus returns only a hint. Used for profiling only!
4376 ExtendedPC os::get_thread_pc(Thread* thread) {
4377 // Make sure that it is called by the watcher and the Threads lock is owned.
4378 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4379 // For now, is only used to profile the VM Thread
4380 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4381 PcFetcher fetcher(thread);
4382 fetcher.run();
4383 return fetcher.result();
4384 }
4385
4386
4387 // This does not do anything on Solaris. This is basically a hook for being
4388 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4389 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4390 f(value, method, args, thread);
4391 }
4392
4393 // This routine may be used by user applications as a "hook" to catch signals.
4394 // The user-defined signal handler must pass unrecognized signals to this
4395 // routine, and if it returns true (non-zero), then the signal handler must
4396 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4397 // routine will never retun false (zero), but instead will execute a VM panic
4398 // routine kill the process.
4399 //
4400 // If this routine returns false, it is OK to call it again. This allows
4401 // the user-defined signal handler to perform checks either before or after
4402 // the VM performs its own checks. Naturally, the user code would be making
4403 // a serious error if it tried to handle an exception (such as a null check
4404 // or breakpoint) that the VM was generating for its own correct operation.
4405 //
4406 // This routine may recognize any of the following kinds of signals:
4407 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4408 // os::Solaris::SIGasync
4409 // It should be consulted by handlers for any of those signals.
4410 // It explicitly does not recognize os::Solaris::SIGinterrupt
4411 //
4412 // The caller of this routine must pass in the three arguments supplied
4413 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4414 // field of the structure passed to sigaction(). This routine assumes that
4415 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4416 //
4417 // Note that the VM will print warnings if it detects conflicting signal
4418 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4419 //
4420 extern "C" JNIEXPORT int
4421 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4422 int abort_if_unrecognized);
4423
4424
4425 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4426 int orig_errno = errno; // Preserve errno value over signal handler.
4427 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4428 errno = orig_errno;
4429 }
4430
4431 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4432 is needed to provoke threads blocked on IO to return an EINTR
4433 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4434 does NOT participate in signal chaining due to requirement for
4435 NOT setting SA_RESTART to make EINTR work. */
4436 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4437 if (UseSignalChaining) {
4438 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4439 if (actp && actp->sa_handler) {
4440 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4441 }
4442 }
4443 }
4444
4445 // This boolean allows users to forward their own non-matching signals
4446 // to JVM_handle_solaris_signal, harmlessly.
4447 bool os::Solaris::signal_handlers_are_installed = false;
4448
4449 // For signal-chaining
4450 bool os::Solaris::libjsig_is_loaded = false;
4451 typedef struct sigaction *(*get_signal_t)(int);
4452 get_signal_t os::Solaris::get_signal_action = NULL;
4453
4454 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4455 struct sigaction *actp = NULL;
4456
4457 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4458 // Retrieve the old signal handler from libjsig
4459 actp = (*get_signal_action)(sig);
4460 }
4461 if (actp == NULL) {
4462 // Retrieve the preinstalled signal handler from jvm
4463 actp = get_preinstalled_handler(sig);
4464 }
4465
4466 return actp;
4467 }
4468
4469 static bool call_chained_handler(struct sigaction *actp, int sig,
4470 siginfo_t *siginfo, void *context) {
4471 // Call the old signal handler
4472 if (actp->sa_handler == SIG_DFL) {
4473 // It's more reasonable to let jvm treat it as an unexpected exception
4474 // instead of taking the default action.
4475 return false;
4476 } else if (actp->sa_handler != SIG_IGN) {
4477 if ((actp->sa_flags & SA_NODEFER) == 0) {
4478 // automaticlly block the signal
4479 sigaddset(&(actp->sa_mask), sig);
4480 }
4481
4482 sa_handler_t hand;
4483 sa_sigaction_t sa;
4484 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4485 // retrieve the chained handler
4486 if (siginfo_flag_set) {
4487 sa = actp->sa_sigaction;
4488 } else {
4489 hand = actp->sa_handler;
4490 }
4491
4492 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4493 actp->sa_handler = SIG_DFL;
4494 }
4495
4496 // try to honor the signal mask
4497 sigset_t oset;
4498 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4499
4500 // call into the chained handler
4501 if (siginfo_flag_set) {
4502 (*sa)(sig, siginfo, context);
4503 } else {
4504 (*hand)(sig);
4505 }
4506
4507 // restore the signal mask
4508 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4509 }
4510 // Tell jvm's signal handler the signal is taken care of.
4511 return true;
4512 }
4513
4514 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4515 bool chained = false;
4516 // signal-chaining
4517 if (UseSignalChaining) {
4518 struct sigaction *actp = get_chained_signal_action(sig);
4519 if (actp != NULL) {
4520 chained = call_chained_handler(actp, sig, siginfo, context);
4521 }
4522 }
4523 return chained;
4524 }
4525
4526 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4527 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4528 if (preinstalled_sigs[sig] != 0) {
4529 return &chainedsigactions[sig];
4530 }
4531 return NULL;
4532 }
4533
4534 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4535
4536 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4537 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4538 chainedsigactions[sig] = oldAct;
4539 preinstalled_sigs[sig] = 1;
4540 }
4541
4542 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4543 // Check for overwrite.
4544 struct sigaction oldAct;
4545 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4546 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4547 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4548 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4549 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4550 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4551 if (AllowUserSignalHandlers || !set_installed) {
4552 // Do not overwrite; user takes responsibility to forward to us.
4553 return;
4554 } else if (UseSignalChaining) {
4555 if (oktochain) {
4556 // save the old handler in jvm
4557 save_preinstalled_handler(sig, oldAct);
4558 } else {
4559 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4560 }
4561 // libjsig also interposes the sigaction() call below and saves the
4562 // old sigaction on it own.
4563 } else {
4564 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4565 "%#lx for signal %d.", (long)oldhand, sig));
4566 }
4567 }
4568
4569 struct sigaction sigAct;
4570 sigfillset(&(sigAct.sa_mask));
4571 sigAct.sa_handler = SIG_DFL;
4572
4573 sigAct.sa_sigaction = signalHandler;
4574 // Handle SIGSEGV on alternate signal stack if
4575 // not using stack banging
4576 if (!UseStackBanging && sig == SIGSEGV) {
4577 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4578 // Interruptible i/o requires SA_RESTART cleared so EINTR
4579 // is returned instead of restarting system calls
4580 } else if (sig == os::Solaris::SIGinterrupt()) {
4581 sigemptyset(&sigAct.sa_mask);
4582 sigAct.sa_handler = NULL;
4583 sigAct.sa_flags = SA_SIGINFO;
4584 sigAct.sa_sigaction = sigINTRHandler;
4585 } else {
4586 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4587 }
4588 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4589
4590 sigaction(sig, &sigAct, &oldAct);
4591
4592 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4593 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4594 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4595 }
4596
4597
4598 #define DO_SIGNAL_CHECK(sig) \
4599 if (!sigismember(&check_signal_done, sig)) \
4600 os::Solaris::check_signal_handler(sig)
4601
4602 // This method is a periodic task to check for misbehaving JNI applications
4603 // under CheckJNI, we can add any periodic checks here
4604
4605 void os::run_periodic_checks() {
4606 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4607 // thereby preventing a NULL checks.
4608 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4609
4610 if (check_signals == false) return;
4611
4612 // SEGV and BUS if overridden could potentially prevent
4613 // generation of hs*.log in the event of a crash, debugging
4614 // such a case can be very challenging, so we absolutely
4615 // check for the following for a good measure:
4616 DO_SIGNAL_CHECK(SIGSEGV);
4617 DO_SIGNAL_CHECK(SIGILL);
4618 DO_SIGNAL_CHECK(SIGFPE);
4619 DO_SIGNAL_CHECK(SIGBUS);
4620 DO_SIGNAL_CHECK(SIGPIPE);
4621 DO_SIGNAL_CHECK(SIGXFSZ);
4622
4623 // ReduceSignalUsage allows the user to override these handlers
4624 // see comments at the very top and jvm_solaris.h
4625 if (!ReduceSignalUsage) {
4626 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4627 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4628 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4629 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4630 }
4631
4632 // See comments above for using JVM1/JVM2 and UseAltSigs
4633 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4634 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4635
4636 }
4637
4638 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4639
4640 static os_sigaction_t os_sigaction = NULL;
4641
4642 void os::Solaris::check_signal_handler(int sig) {
4643 char buf[O_BUFLEN];
4644 address jvmHandler = NULL;
4645
4646 struct sigaction act;
4647 if (os_sigaction == NULL) {
4648 // only trust the default sigaction, in case it has been interposed
4649 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4650 if (os_sigaction == NULL) return;
4651 }
4652
4653 os_sigaction(sig, (struct sigaction*)NULL, &act);
4654
4655 address thisHandler = (act.sa_flags & SA_SIGINFO)
4656 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4657 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4658
4659
4660 switch(sig) {
4661 case SIGSEGV:
4662 case SIGBUS:
4663 case SIGFPE:
4664 case SIGPIPE:
4665 case SIGXFSZ:
4666 case SIGILL:
4667 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4668 break;
4669
4670 case SHUTDOWN1_SIGNAL:
4671 case SHUTDOWN2_SIGNAL:
4672 case SHUTDOWN3_SIGNAL:
4673 case BREAK_SIGNAL:
4674 jvmHandler = (address)user_handler();
4675 break;
4676
4677 default:
4678 int intrsig = os::Solaris::SIGinterrupt();
4679 int asynsig = os::Solaris::SIGasync();
4680
4681 if (sig == intrsig) {
4682 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4683 } else if (sig == asynsig) {
4684 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4685 } else {
4686 return;
4687 }
4688 break;
4689 }
4690
4691
4692 if (thisHandler != jvmHandler) {
4693 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4694 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4695 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4696 // No need to check this sig any longer
4697 sigaddset(&check_signal_done, sig);
4698 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4699 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4700 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4701 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4702 // No need to check this sig any longer
4703 sigaddset(&check_signal_done, sig);
4704 }
4705
4706 // Print all the signal handler state
4707 if (sigismember(&check_signal_done, sig)) {
4708 print_signal_handlers(tty, buf, O_BUFLEN);
4709 }
4710
4711 }
4712
4713 void os::Solaris::install_signal_handlers() {
4714 bool libjsigdone = false;
4715 signal_handlers_are_installed = true;
4716
4717 // signal-chaining
4718 typedef void (*signal_setting_t)();
4719 signal_setting_t begin_signal_setting = NULL;
4720 signal_setting_t end_signal_setting = NULL;
4721 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4722 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4723 if (begin_signal_setting != NULL) {
4724 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4725 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4726 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4727 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4728 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4729 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4730 libjsig_is_loaded = true;
4731 if (os::Solaris::get_libjsig_version != NULL) {
4732 libjsigversion = (*os::Solaris::get_libjsig_version)();
4733 }
4734 assert(UseSignalChaining, "should enable signal-chaining");
4735 }
4736 if (libjsig_is_loaded) {
4737 // Tell libjsig jvm is setting signal handlers
4738 (*begin_signal_setting)();
4739 }
4740
4741 set_signal_handler(SIGSEGV, true, true);
4742 set_signal_handler(SIGPIPE, true, true);
4743 set_signal_handler(SIGXFSZ, true, true);
4744 set_signal_handler(SIGBUS, true, true);
4745 set_signal_handler(SIGILL, true, true);
4746 set_signal_handler(SIGFPE, true, true);
4747
4748
4749 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4750
4751 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4752 // can not register overridable signals which might be > 32
4753 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4754 // Tell libjsig jvm has finished setting signal handlers
4755 (*end_signal_setting)();
4756 libjsigdone = true;
4757 }
4758 }
4759
4760 // Never ok to chain our SIGinterrupt
4761 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4762 set_signal_handler(os::Solaris::SIGasync(), true, true);
4763
4764 if (libjsig_is_loaded && !libjsigdone) {
4765 // Tell libjsig jvm finishes setting signal handlers
4766 (*end_signal_setting)();
4767 }
4768
4769 // We don't activate signal checker if libjsig is in place, we trust ourselves
4770 // and if UserSignalHandler is installed all bets are off.
4771 // Log that signal checking is off only if -verbose:jni is specified.
4772 if (CheckJNICalls) {
4773 if (libjsig_is_loaded) {
4774 if (PrintJNIResolving) {
4775 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4776 }
4777 check_signals = false;
4778 }
4779 if (AllowUserSignalHandlers) {
4780 if (PrintJNIResolving) {
4781 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4782 }
4783 check_signals = false;
4784 }
4785 }
4786 }
4787
4788
4789 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4790
4791 const char * signames[] = {
4792 "SIG0",
4793 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4794 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4795 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4796 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4797 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4798 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4799 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4800 "SIGCANCEL", "SIGLOST"
4801 };
4802
4803 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4804 if (0 < exception_code && exception_code <= SIGRTMAX) {
4805 // signal
4806 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4807 jio_snprintf(buf, size, "%s", signames[exception_code]);
4808 } else {
4809 jio_snprintf(buf, size, "SIG%d", exception_code);
4810 }
4811 return buf;
4812 } else {
4813 return NULL;
4814 }
4815 }
4816
4817 // (Static) wrappers for the new libthread API
4818 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4819 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4820 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4821 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4822 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4823
4824 // (Static) wrapper for getisax(2) call.
4825 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4826
4827 // (Static) wrappers for the liblgrp API
4828 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4829 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4830 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4831 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4832 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4833 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4834 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4835 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4836 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4837
4838 // (Static) wrapper for meminfo() call.
4839 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4840
4841 static address resolve_symbol_lazy(const char* name) {
4842 address addr = (address) dlsym(RTLD_DEFAULT, name);
4843 if(addr == NULL) {
4844 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4845 addr = (address) dlsym(RTLD_NEXT, name);
4846 }
4847 return addr;
4848 }
4849
4850 static address resolve_symbol(const char* name) {
4851 address addr = resolve_symbol_lazy(name);
4852 if(addr == NULL) {
4853 fatal(dlerror());
4854 }
4855 return addr;
4856 }
4857
4858
4859
4860 // isT2_libthread()
4861 //
4862 // Routine to determine if we are currently using the new T2 libthread.
4863 //
4864 // We determine if we are using T2 by reading /proc/self/lstatus and
4865 // looking for a thread with the ASLWP bit set. If we find this status
4866 // bit set, we must assume that we are NOT using T2. The T2 team
4867 // has approved this algorithm.
4868 //
4869 // We need to determine if we are running with the new T2 libthread
4870 // since setting native thread priorities is handled differently
4871 // when using this library. All threads created using T2 are bound
4872 // threads. Calling thr_setprio is meaningless in this case.
4873 //
4874 bool isT2_libthread() {
4875 static prheader_t * lwpArray = NULL;
4876 static int lwpSize = 0;
4877 static int lwpFile = -1;
4878 lwpstatus_t * that;
4879 char lwpName [128];
4880 bool isT2 = false;
4881
4882 #define ADR(x) ((uintptr_t)(x))
4883 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4884
4885 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4886 if (lwpFile < 0) {
4887 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4888 return false;
4889 }
4890 lwpSize = 16*1024;
4891 for (;;) {
4892 ::lseek64 (lwpFile, 0, SEEK_SET);
4893 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4894 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4895 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4896 break;
4897 }
4898 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4899 // We got a good snapshot - now iterate over the list.
4900 int aslwpcount = 0;
4901 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4902 that = LWPINDEX(lwpArray,i);
4903 if (that->pr_flags & PR_ASLWP) {
4904 aslwpcount++;
4905 }
4906 }
4907 if (aslwpcount == 0) isT2 = true;
4908 break;
4909 }
4910 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4911 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4912 }
4913
4914 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4915 ::close (lwpFile);
4916 if (ThreadPriorityVerbose) {
4917 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4918 else tty->print_cr("We are not running with a T2 libthread\n");
4919 }
4920 return isT2;
4921 }
4922
4923
4924 void os::Solaris::libthread_init() {
4925 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4926
4927 // Determine if we are running with the new T2 libthread
4928 os::Solaris::set_T2_libthread(isT2_libthread());
4929
4930 lwp_priocntl_init();
4931
4932 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4933 if(func == NULL) {
4934 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4935 // Guarantee that this VM is running on an new enough OS (5.6 or
4936 // later) that it will have a new enough libthread.so.
4937 guarantee(func != NULL, "libthread.so is too old.");
4938 }
4939
4940 // Initialize the new libthread getstate API wrappers
4941 func = resolve_symbol("thr_getstate");
4942 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4943
4944 func = resolve_symbol("thr_setstate");
4945 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4946
4947 func = resolve_symbol("thr_setmutator");
4948 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4949
4950 func = resolve_symbol("thr_suspend_mutator");
4951 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4952
4953 func = resolve_symbol("thr_continue_mutator");
4954 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4955
4956 int size;
4957 void (*handler_info_func)(address *, int *);
4958 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4959 handler_info_func(&handler_start, &size);
4960 handler_end = handler_start + size;
4961 }
4962
4963
4964 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4965 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4966 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4967 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4968 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4969 int os::Solaris::_mutex_scope = USYNC_THREAD;
4970
4971 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4972 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4973 int_fnP_cond_tP os::Solaris::_cond_signal;
4974 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4975 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4976 int_fnP_cond_tP os::Solaris::_cond_destroy;
4977 int os::Solaris::_cond_scope = USYNC_THREAD;
4978
4979 void os::Solaris::synchronization_init() {
4980 if(UseLWPSynchronization) {
4981 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4982 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4983 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4984 os::Solaris::set_mutex_init(lwp_mutex_init);
4985 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4986 os::Solaris::set_mutex_scope(USYNC_THREAD);
4987
4988 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4989 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4990 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4991 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4992 os::Solaris::set_cond_init(lwp_cond_init);
4993 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4994 os::Solaris::set_cond_scope(USYNC_THREAD);
4995 }
4996 else {
4997 os::Solaris::set_mutex_scope(USYNC_THREAD);
4998 os::Solaris::set_cond_scope(USYNC_THREAD);
4999
5000 if(UsePthreads) {
5001 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
5002 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
5003 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
5004 os::Solaris::set_mutex_init(pthread_mutex_default_init);
5005 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
5006
5007 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
5008 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
5009 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
5010 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
5011 os::Solaris::set_cond_init(pthread_cond_default_init);
5012 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
5013 }
5014 else {
5015 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
5016 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
5017 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
5018 os::Solaris::set_mutex_init(::mutex_init);
5019 os::Solaris::set_mutex_destroy(::mutex_destroy);
5020
5021 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
5022 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
5023 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
5024 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
5025 os::Solaris::set_cond_init(::cond_init);
5026 os::Solaris::set_cond_destroy(::cond_destroy);
5027 }
5028 }
5029 }
5030
5031 bool os::Solaris::liblgrp_init() {
5032 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
5033 if (handle != NULL) {
5034 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
5035 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
5036 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
5037 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
5038 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
5039 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
5040 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
5041 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
5042 dlsym(handle, "lgrp_cookie_stale")));
5043
5044 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
5045 set_lgrp_cookie(c);
5046 return true;
5047 }
5048 return false;
5049 }
5050
5051 void os::Solaris::misc_sym_init() {
5052 address func;
5053
5054 // getisax
5055 func = resolve_symbol_lazy("getisax");
5056 if (func != NULL) {
5057 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
5058 }
5059
5060 // meminfo
5061 func = resolve_symbol_lazy("meminfo");
5062 if (func != NULL) {
5063 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
5064 }
5065 }
5066
5067 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
5068 assert(_getisax != NULL, "_getisax not set");
5069 return _getisax(array, n);
5070 }
5071
5072 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
5073 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
5074 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
5075
5076 void init_pset_getloadavg_ptr(void) {
5077 pset_getloadavg_ptr =
5078 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
5079 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
5080 warning("pset_getloadavg function not found");
5081 }
5082 }
5083
5084 int os::Solaris::_dev_zero_fd = -1;
5085
5086 // this is called _before_ the global arguments have been parsed
5087 void os::init(void) {
5088 _initial_pid = getpid();
5089
5090 max_hrtime = first_hrtime = gethrtime();
5091
5092 init_random(1234567);
5093
5094 page_size = sysconf(_SC_PAGESIZE);
5095 if (page_size == -1)
5096 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
5097 strerror(errno)));
5098 init_page_sizes((size_t) page_size);
5099
5100 Solaris::initialize_system_info();
5101
5102 // Initialize misc. symbols as soon as possible, so we can use them
5103 // if we need them.
5104 Solaris::misc_sym_init();
5105
5106 int fd = ::open("/dev/zero", O_RDWR);
5107 if (fd < 0) {
5108 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
5109 } else {
5110 Solaris::set_dev_zero_fd(fd);
5111
5112 // Close on exec, child won't inherit.
5113 fcntl(fd, F_SETFD, FD_CLOEXEC);
5114 }
5115
5116 clock_tics_per_sec = CLK_TCK;
5117
5118 // check if dladdr1() exists; dladdr1 can provide more information than
5119 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
5120 // and is available on linker patches for 5.7 and 5.8.
5121 // libdl.so must have been loaded, this call is just an entry lookup
5122 void * hdl = dlopen("libdl.so", RTLD_NOW);
5123 if (hdl)
5124 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
5125
5126 // (Solaris only) this switches to calls that actually do locking.
5127 ThreadCritical::initialize();
5128
5129 main_thread = thr_self();
5130
5131 // Constant minimum stack size allowed. It must be at least
5132 // the minimum of what the OS supports (thr_min_stack()), and
5133 // enough to allow the thread to get to user bytecode execution.
5134 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
5135 // If the pagesize of the VM is greater than 8K determine the appropriate
5136 // number of initial guard pages. The user can change this with the
5137 // command line arguments, if needed.
5138 if (vm_page_size() > 8*K) {
5139 StackYellowPages = 1;
5140 StackRedPages = 1;
5141 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
5142 }
5143 }
5144
5145 // To install functions for atexit system call
5146 extern "C" {
5147 static void perfMemory_exit_helper() {
5148 perfMemory_exit();
5149 }
5150 }
5151
5152 // this is called _after_ the global arguments have been parsed
5153 jint os::init_2(void) {
5154 // try to enable extended file IO ASAP, see 6431278
5155 os::Solaris::try_enable_extended_io();
5156
5157 // Allocate a single page and mark it as readable for safepoint polling. Also
5158 // use this first mmap call to check support for MAP_ALIGN.
5159 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
5160 page_size,
5161 MAP_PRIVATE | MAP_ALIGN,
5162 PROT_READ);
5163 if (polling_page == NULL) {
5164 has_map_align = false;
5165 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
5166 PROT_READ);
5167 }
5168
5169 os::set_polling_page(polling_page);
5170
5171 #ifndef PRODUCT
5172 if( Verbose && PrintMiscellaneous )
5173 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
5174 #endif
5175
5176 if (!UseMembar) {
5177 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
5178 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
5179 os::set_memory_serialize_page( mem_serialize_page );
5180
5181 #ifndef PRODUCT
5182 if(Verbose && PrintMiscellaneous)
5183 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
5184 #endif
5185 }
5186
5187 // Check minimum allowable stack size for thread creation and to initialize
5188 // the java system classes, including StackOverflowError - depends on page
5189 // size. Add a page for compiler2 recursion in main thread.
5190 // Add in 2*BytesPerWord times page size to account for VM stack during
5191 // class initialization depending on 32 or 64 bit VM.
5192 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5193 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5194 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5195
5196 size_t threadStackSizeInBytes = ThreadStackSize * K;
5197 if (threadStackSizeInBytes != 0 &&
5198 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5199 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5200 os::Solaris::min_stack_allowed/K);
5201 return JNI_ERR;
5202 }
5203
5204 // For 64kbps there will be a 64kb page size, which makes
5205 // the usable default stack size quite a bit less. Increase the
5206 // stack for 64kb (or any > than 8kb) pages, this increases
5207 // virtual memory fragmentation (since we're not creating the
5208 // stack on a power of 2 boundary. The real fix for this
5209 // should be to fix the guard page mechanism.
5210
5211 if (vm_page_size() > 8*K) {
5212 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5213 ? threadStackSizeInBytes +
5214 ((StackYellowPages + StackRedPages) * vm_page_size())
5215 : 0;
5216 ThreadStackSize = threadStackSizeInBytes/K;
5217 }
5218
5219 // Make the stack size a multiple of the page size so that
5220 // the yellow/red zones can be guarded.
5221 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5222 vm_page_size()));
5223
5224 Solaris::libthread_init();
5225
5226 if (UseNUMA) {
5227 if (!Solaris::liblgrp_init()) {
5228 UseNUMA = false;
5229 } else {
5230 size_t lgrp_limit = os::numa_get_groups_num();
5231 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5232 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5233 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5234 if (lgrp_num < 2) {
5235 // There's only one locality group, disable NUMA.
5236 UseNUMA = false;
5237 }
5238 }
5239 if (!UseNUMA && ForceNUMA) {
5240 UseNUMA = true;
5241 }
5242 }
5243
5244 Solaris::signal_sets_init();
5245 Solaris::init_signal_mem();
5246 Solaris::install_signal_handlers();
5247
5248 if (libjsigversion < JSIG_VERSION_1_4_1) {
5249 Maxlibjsigsigs = OLDMAXSIGNUM;
5250 }
5251
5252 // initialize synchronization primitives to use either thread or
5253 // lwp synchronization (controlled by UseLWPSynchronization)
5254 Solaris::synchronization_init();
5255
5256 if (MaxFDLimit) {
5257 // set the number of file descriptors to max. print out error
5258 // if getrlimit/setrlimit fails but continue regardless.
5259 struct rlimit nbr_files;
5260 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5261 if (status != 0) {
5262 if (PrintMiscellaneous && (Verbose || WizardMode))
5263 perror("os::init_2 getrlimit failed");
5264 } else {
5265 nbr_files.rlim_cur = nbr_files.rlim_max;
5266 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5267 if (status != 0) {
5268 if (PrintMiscellaneous && (Verbose || WizardMode))
5269 perror("os::init_2 setrlimit failed");
5270 }
5271 }
5272 }
5273
5274 // Calculate theoretical max. size of Threads to guard gainst
5275 // artifical out-of-memory situations, where all available address-
5276 // space has been reserved by thread stacks. Default stack size is 1Mb.
5277 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5278 JavaThread::stack_size_at_create() : (1*K*K);
5279 assert(pre_thread_stack_size != 0, "Must have a stack");
5280 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5281 // we should start doing Virtual Memory banging. Currently when the threads will
5282 // have used all but 200Mb of space.
5283 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5284 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5285
5286 // at-exit methods are called in the reverse order of their registration.
5287 // In Solaris 7 and earlier, atexit functions are called on return from
5288 // main or as a result of a call to exit(3C). There can be only 32 of
5289 // these functions registered and atexit() does not set errno. In Solaris
5290 // 8 and later, there is no limit to the number of functions registered
5291 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5292 // functions are called upon dlclose(3DL) in addition to return from main
5293 // and exit(3C).
5294
5295 if (PerfAllowAtExitRegistration) {
5296 // only register atexit functions if PerfAllowAtExitRegistration is set.
5297 // atexit functions can be delayed until process exit time, which
5298 // can be problematic for embedded VM situations. Embedded VMs should
5299 // call DestroyJavaVM() to assure that VM resources are released.
5300
5301 // note: perfMemory_exit_helper atexit function may be removed in
5302 // the future if the appropriate cleanup code can be added to the
5303 // VM_Exit VMOperation's doit method.
5304 if (atexit(perfMemory_exit_helper) != 0) {
5305 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5306 }
5307 }
5308
5309 // Init pset_loadavg function pointer
5310 init_pset_getloadavg_ptr();
5311
5312 return JNI_OK;
5313 }
5314
5315 void os::init_3(void) {
5316 return;
5317 }
5318
5319 // Mark the polling page as unreadable
5320 void os::make_polling_page_unreadable(void) {
5321 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5322 fatal("Could not disable polling page");
5323 };
5324
5325 // Mark the polling page as readable
5326 void os::make_polling_page_readable(void) {
5327 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5328 fatal("Could not enable polling page");
5329 };
5330
5331 // OS interface.
5332
5333 bool os::check_heap(bool force) { return true; }
5334
5335 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5336 static vsnprintf_t sol_vsnprintf = NULL;
5337
5338 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5339 if (!sol_vsnprintf) {
5340 //search for the named symbol in the objects that were loaded after libjvm
5341 void* where = RTLD_NEXT;
5342 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5343 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5344 if (!sol_vsnprintf){
5345 //search for the named symbol in the objects that were loaded before libjvm
5346 where = RTLD_DEFAULT;
5347 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5348 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5349 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5350 }
5351 }
5352 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5353 }
5354
5355
5356 // Is a (classpath) directory empty?
5357 bool os::dir_is_empty(const char* path) {
5358 DIR *dir = NULL;
5359 struct dirent *ptr;
5360
5361 dir = opendir(path);
5362 if (dir == NULL) return true;
5363
5364 /* Scan the directory */
5365 bool result = true;
5366 char buf[sizeof(struct dirent) + MAX_PATH];
5367 struct dirent *dbuf = (struct dirent *) buf;
5368 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5369 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5370 result = false;
5371 }
5372 }
5373 closedir(dir);
5374 return result;
5375 }
5376
5377 // This code originates from JDK's sysOpen and open64_w
5378 // from src/solaris/hpi/src/system_md.c
5379
5380 #ifndef O_DELETE
5381 #define O_DELETE 0x10000
5382 #endif
5383
5384 // Open a file. Unlink the file immediately after open returns
5385 // if the specified oflag has the O_DELETE flag set.
5386 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5387
5388 int os::open(const char *path, int oflag, int mode) {
5389 if (strlen(path) > MAX_PATH - 1) {
5390 errno = ENAMETOOLONG;
5391 return -1;
5392 }
5393 int fd;
5394 int o_delete = (oflag & O_DELETE);
5395 oflag = oflag & ~O_DELETE;
5396
5397 fd = ::open64(path, oflag, mode);
5398 if (fd == -1) return -1;
5399
5400 //If the open succeeded, the file might still be a directory
5401 {
5402 struct stat64 buf64;
5403 int ret = ::fstat64(fd, &buf64);
5404 int st_mode = buf64.st_mode;
5405
5406 if (ret != -1) {
5407 if ((st_mode & S_IFMT) == S_IFDIR) {
5408 errno = EISDIR;
5409 ::close(fd);
5410 return -1;
5411 }
5412 } else {
5413 ::close(fd);
5414 return -1;
5415 }
5416 }
5417 /*
5418 * 32-bit Solaris systems suffer from:
5419 *
5420 * - an historical default soft limit of 256 per-process file
5421 * descriptors that is too low for many Java programs.
5422 *
5423 * - a design flaw where file descriptors created using stdio
5424 * fopen must be less than 256, _even_ when the first limit above
5425 * has been raised. This can cause calls to fopen (but not calls to
5426 * open, for example) to fail mysteriously, perhaps in 3rd party
5427 * native code (although the JDK itself uses fopen). One can hardly
5428 * criticize them for using this most standard of all functions.
5429 *
5430 * We attempt to make everything work anyways by:
5431 *
5432 * - raising the soft limit on per-process file descriptors beyond
5433 * 256
5434 *
5435 * - As of Solaris 10u4, we can request that Solaris raise the 256
5436 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5437 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5438 *
5439 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5440 * workaround the bug by remapping non-stdio file descriptors below
5441 * 256 to ones beyond 256, which is done below.
5442 *
5443 * See:
5444 * 1085341: 32-bit stdio routines should support file descriptors >255
5445 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5446 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5447 * enable_extended_FILE_stdio() in VM initialisation
5448 * Giri Mandalika's blog
5449 * http://technopark02.blogspot.com/2005_05_01_archive.html
5450 */
5451 #ifndef _LP64
5452 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5453 int newfd = ::fcntl(fd, F_DUPFD, 256);
5454 if (newfd != -1) {
5455 ::close(fd);
5456 fd = newfd;
5457 }
5458 }
5459 #endif // 32-bit Solaris
5460 /*
5461 * All file descriptors that are opened in the JVM and not
5462 * specifically destined for a subprocess should have the
5463 * close-on-exec flag set. If we don't set it, then careless 3rd
5464 * party native code might fork and exec without closing all
5465 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5466 * UNIXProcess.c), and this in turn might:
5467 *
5468 * - cause end-of-file to fail to be detected on some file
5469 * descriptors, resulting in mysterious hangs, or
5470 *
5471 * - might cause an fopen in the subprocess to fail on a system
5472 * suffering from bug 1085341.
5473 *
5474 * (Yes, the default setting of the close-on-exec flag is a Unix
5475 * design flaw)
5476 *
5477 * See:
5478 * 1085341: 32-bit stdio routines should support file descriptors >255
5479 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5480 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5481 */
5482 #ifdef FD_CLOEXEC
5483 {
5484 int flags = ::fcntl(fd, F_GETFD);
5485 if (flags != -1)
5486 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5487 }
5488 #endif
5489
5490 if (o_delete != 0) {
5491 ::unlink(path);
5492 }
5493 return fd;
5494 }
5495
5496 // create binary file, rewriting existing file if required
5497 int os::create_binary_file(const char* path, bool rewrite_existing) {
5498 int oflags = O_WRONLY | O_CREAT;
5499 if (!rewrite_existing) {
5500 oflags |= O_EXCL;
5501 }
5502 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5503 }
5504
5505 // return current position of file pointer
5506 jlong os::current_file_offset(int fd) {
5507 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5508 }
5509
5510 // move file pointer to the specified offset
5511 jlong os::seek_to_file_offset(int fd, jlong offset) {
5512 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5513 }
5514
5515 jlong os::lseek(int fd, jlong offset, int whence) {
5516 return (jlong) ::lseek64(fd, offset, whence);
5517 }
5518
5519 char * os::native_path(char *path) {
5520 return path;
5521 }
5522
5523 int os::ftruncate(int fd, jlong length) {
5524 return ::ftruncate64(fd, length);
5525 }
5526
5527 int os::fsync(int fd) {
5528 RESTARTABLE_RETURN_INT(::fsync(fd));
5529 }
5530
5531 int os::available(int fd, jlong *bytes) {
5532 jlong cur, end;
5533 int mode;
5534 struct stat64 buf64;
5535
5536 if (::fstat64(fd, &buf64) >= 0) {
5537 mode = buf64.st_mode;
5538 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5539 /*
5540 * XXX: is the following call interruptible? If so, this might
5541 * need to go through the INTERRUPT_IO() wrapper as for other
5542 * blocking, interruptible calls in this file.
5543 */
5544 int n,ioctl_return;
5545
5546 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5547 if (ioctl_return>= 0) {
5548 *bytes = n;
5549 return 1;
5550 }
5551 }
5552 }
5553 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5554 return 0;
5555 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5556 return 0;
5557 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5558 return 0;
5559 }
5560 *bytes = end - cur;
5561 return 1;
5562 }
5563
5564 // Map a block of memory.
5565 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5566 char *addr, size_t bytes, bool read_only,
5567 bool allow_exec) {
5568 int prot;
5569 int flags;
5570
5571 if (read_only) {
5572 prot = PROT_READ;
5573 flags = MAP_SHARED;
5574 } else {
5575 prot = PROT_READ | PROT_WRITE;
5576 flags = MAP_PRIVATE;
5577 }
5578
5579 if (allow_exec) {
5580 prot |= PROT_EXEC;
5581 }
5582
5583 if (addr != NULL) {
5584 flags |= MAP_FIXED;
5585 }
5586
5587 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5588 fd, file_offset);
5589 if (mapped_address == MAP_FAILED) {
5590 return NULL;
5591 }
5592 return mapped_address;
5593 }
5594
5595
5596 // Remap a block of memory.
5597 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5598 char *addr, size_t bytes, bool read_only,
5599 bool allow_exec) {
5600 // same as map_memory() on this OS
5601 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5602 allow_exec);
5603 }
5604
5605
5606 // Unmap a block of memory.
5607 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5608 return munmap(addr, bytes) == 0;
5609 }
5610
5611 void os::pause() {
5612 char filename[MAX_PATH];
5613 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5614 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5615 } else {
5616 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5617 }
5618
5619 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5620 if (fd != -1) {
5621 struct stat buf;
5622 ::close(fd);
5623 while (::stat(filename, &buf) == 0) {
5624 (void)::poll(NULL, 0, 100);
5625 }
5626 } else {
5627 jio_fprintf(stderr,
5628 "Could not open pause file '%s', continuing immediately.\n", filename);
5629 }
5630 }
5631
5632 #ifndef PRODUCT
5633 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5634 // Turn this on if you need to trace synch operations.
5635 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5636 // and call record_synch_enable and record_synch_disable
5637 // around the computation of interest.
5638
5639 void record_synch(char* name, bool returning); // defined below
5640
5641 class RecordSynch {
5642 char* _name;
5643 public:
5644 RecordSynch(char* name) :_name(name)
5645 { record_synch(_name, false); }
5646 ~RecordSynch() { record_synch(_name, true); }
5647 };
5648
5649 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5650 extern "C" ret name params { \
5651 typedef ret name##_t params; \
5652 static name##_t* implem = NULL; \
5653 static int callcount = 0; \
5654 if (implem == NULL) { \
5655 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5656 if (implem == NULL) fatal(dlerror()); \
5657 } \
5658 ++callcount; \
5659 RecordSynch _rs(#name); \
5660 inner; \
5661 return implem args; \
5662 }
5663 // in dbx, examine callcounts this way:
5664 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5665
5666 #define CHECK_POINTER_OK(p) \
5667 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5668 #define CHECK_MU \
5669 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5670 #define CHECK_CV \
5671 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5672 #define CHECK_P(p) \
5673 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5674
5675 #define CHECK_MUTEX(mutex_op) \
5676 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5677
5678 CHECK_MUTEX( mutex_lock)
5679 CHECK_MUTEX( _mutex_lock)
5680 CHECK_MUTEX( mutex_unlock)
5681 CHECK_MUTEX(_mutex_unlock)
5682 CHECK_MUTEX( mutex_trylock)
5683 CHECK_MUTEX(_mutex_trylock)
5684
5685 #define CHECK_COND(cond_op) \
5686 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5687
5688 CHECK_COND( cond_wait);
5689 CHECK_COND(_cond_wait);
5690 CHECK_COND(_cond_wait_cancel);
5691
5692 #define CHECK_COND2(cond_op) \
5693 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5694
5695 CHECK_COND2( cond_timedwait);
5696 CHECK_COND2(_cond_timedwait);
5697 CHECK_COND2(_cond_timedwait_cancel);
5698
5699 // do the _lwp_* versions too
5700 #define mutex_t lwp_mutex_t
5701 #define cond_t lwp_cond_t
5702 CHECK_MUTEX( _lwp_mutex_lock)
5703 CHECK_MUTEX( _lwp_mutex_unlock)
5704 CHECK_MUTEX( _lwp_mutex_trylock)
5705 CHECK_MUTEX( __lwp_mutex_lock)
5706 CHECK_MUTEX( __lwp_mutex_unlock)
5707 CHECK_MUTEX( __lwp_mutex_trylock)
5708 CHECK_MUTEX(___lwp_mutex_lock)
5709 CHECK_MUTEX(___lwp_mutex_unlock)
5710
5711 CHECK_COND( _lwp_cond_wait);
5712 CHECK_COND( __lwp_cond_wait);
5713 CHECK_COND(___lwp_cond_wait);
5714
5715 CHECK_COND2( _lwp_cond_timedwait);
5716 CHECK_COND2( __lwp_cond_timedwait);
5717 #undef mutex_t
5718 #undef cond_t
5719
5720 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5721 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5722 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5723 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5724 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5725 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5726 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5727 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5728
5729
5730 // recording machinery:
5731
5732 enum { RECORD_SYNCH_LIMIT = 200 };
5733 char* record_synch_name[RECORD_SYNCH_LIMIT];
5734 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5735 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5736 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5737 int record_synch_count = 0;
5738 bool record_synch_enabled = false;
5739
5740 // in dbx, examine recorded data this way:
5741 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5742
5743 void record_synch(char* name, bool returning) {
5744 if (record_synch_enabled) {
5745 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5746 record_synch_name[record_synch_count] = name;
5747 record_synch_returning[record_synch_count] = returning;
5748 record_synch_thread[record_synch_count] = thr_self();
5749 record_synch_arg0ptr[record_synch_count] = &name;
5750 record_synch_count++;
5751 }
5752 // put more checking code here:
5753 // ...
5754 }
5755 }
5756
5757 void record_synch_enable() {
5758 // start collecting trace data, if not already doing so
5759 if (!record_synch_enabled) record_synch_count = 0;
5760 record_synch_enabled = true;
5761 }
5762
5763 void record_synch_disable() {
5764 // stop collecting trace data
5765 record_synch_enabled = false;
5766 }
5767
5768 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5769 #endif // PRODUCT
5770
5771 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5772 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5773 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5774
5775
5776 // JVMTI & JVM monitoring and management support
5777 // The thread_cpu_time() and current_thread_cpu_time() are only
5778 // supported if is_thread_cpu_time_supported() returns true.
5779 // They are not supported on Solaris T1.
5780
5781 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5782 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5783 // of a thread.
5784 //
5785 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5786 // returns the fast estimate available on the platform.
5787
5788 // hrtime_t gethrvtime() return value includes
5789 // user time but does not include system time
5790 jlong os::current_thread_cpu_time() {
5791 return (jlong) gethrvtime();
5792 }
5793
5794 jlong os::thread_cpu_time(Thread *thread) {
5795 // return user level CPU time only to be consistent with
5796 // what current_thread_cpu_time returns.
5797 // thread_cpu_time_info() must be changed if this changes
5798 return os::thread_cpu_time(thread, false /* user time only */);
5799 }
5800
5801 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5802 if (user_sys_cpu_time) {
5803 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5804 } else {
5805 return os::current_thread_cpu_time();
5806 }
5807 }
5808
5809 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5810 char proc_name[64];
5811 int count;
5812 prusage_t prusage;
5813 jlong lwp_time;
5814 int fd;
5815
5816 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5817 getpid(),
5818 thread->osthread()->lwp_id());
5819 fd = ::open(proc_name, O_RDONLY);
5820 if ( fd == -1 ) return -1;
5821
5822 do {
5823 count = ::pread(fd,
5824 (void *)&prusage.pr_utime,
5825 thr_time_size,
5826 thr_time_off);
5827 } while (count < 0 && errno == EINTR);
5828 ::close(fd);
5829 if ( count < 0 ) return -1;
5830
5831 if (user_sys_cpu_time) {
5832 // user + system CPU time
5833 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5834 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5835 (jlong)prusage.pr_stime.tv_nsec +
5836 (jlong)prusage.pr_utime.tv_nsec;
5837 } else {
5838 // user level CPU time only
5839 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5840 (jlong)prusage.pr_utime.tv_nsec;
5841 }
5842
5843 return(lwp_time);
5844 }
5845
5846 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5847 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5848 info_ptr->may_skip_backward = false; // elapsed time not wall time
5849 info_ptr->may_skip_forward = false; // elapsed time not wall time
5850 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5851 }
5852
5853 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5854 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5855 info_ptr->may_skip_backward = false; // elapsed time not wall time
5856 info_ptr->may_skip_forward = false; // elapsed time not wall time
5857 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5858 }
5859
5860 bool os::is_thread_cpu_time_supported() {
5861 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5862 return true;
5863 } else {
5864 return false;
5865 }
5866 }
5867
5868 // System loadavg support. Returns -1 if load average cannot be obtained.
5869 // Return the load average for our processor set if the primitive exists
5870 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5871 int os::loadavg(double loadavg[], int nelem) {
5872 if (pset_getloadavg_ptr != NULL) {
5873 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5874 } else {
5875 return ::getloadavg(loadavg, nelem);
5876 }
5877 }
5878
5879 //---------------------------------------------------------------------------------
5880
5881 bool os::find(address addr, outputStream* st) {
5882 Dl_info dlinfo;
5883 memset(&dlinfo, 0, sizeof(dlinfo));
5884 if (dladdr(addr, &dlinfo) != 0) {
5885 st->print(PTR_FORMAT ": ", addr);
5886 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5887 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5888 } else if (dlinfo.dli_fbase != NULL)
5889 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5890 else
5891 st->print("<absolute address>");
5892 if (dlinfo.dli_fname != NULL) {
5893 st->print(" in %s", dlinfo.dli_fname);
5894 }
5895 if (dlinfo.dli_fbase != NULL) {
5896 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5897 }
5898 st->cr();
5899
5900 if (Verbose) {
5901 // decode some bytes around the PC
5902 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5903 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5904 address lowest = (address) dlinfo.dli_sname;
5905 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5906 if (begin < lowest) begin = lowest;
5907 Dl_info dlinfo2;
5908 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5909 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5910 end = (address) dlinfo2.dli_saddr;
5911 Disassembler::decode(begin, end, st);
5912 }
5913 return true;
5914 }
5915 return false;
5916 }
5917
5918 // Following function has been added to support HotSparc's libjvm.so running
5919 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5920 // src/solaris/hpi/native_threads in the EVM codebase.
5921 //
5922 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5923 // libraries and should thus be removed. We will leave it behind for a while
5924 // until we no longer want to able to run on top of 1.3.0 Solaris production
5925 // JDK. See 4341971.
5926
5927 #define STACK_SLACK 0x800
5928
5929 extern "C" {
5930 intptr_t sysThreadAvailableStackWithSlack() {
5931 stack_t st;
5932 intptr_t retval, stack_top;
5933 retval = thr_stksegment(&st);
5934 assert(retval == 0, "incorrect return value from thr_stksegment");
5935 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5936 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5937 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5938 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5939 }
5940 }
5941
5942 // ObjectMonitor park-unpark infrastructure ...
5943 //
5944 // We implement Solaris and Linux PlatformEvents with the
5945 // obvious condvar-mutex-flag triple.
5946 // Another alternative that works quite well is pipes:
5947 // Each PlatformEvent consists of a pipe-pair.
5948 // The thread associated with the PlatformEvent
5949 // calls park(), which reads from the input end of the pipe.
5950 // Unpark() writes into the other end of the pipe.
5951 // The write-side of the pipe must be set NDELAY.
5952 // Unfortunately pipes consume a large # of handles.
5953 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5954 // Using pipes for the 1st few threads might be workable, however.
5955 //
5956 // park() is permitted to return spuriously.
5957 // Callers of park() should wrap the call to park() in
5958 // an appropriate loop. A litmus test for the correct
5959 // usage of park is the following: if park() were modified
5960 // to immediately return 0 your code should still work,
5961 // albeit degenerating to a spin loop.
5962 //
5963 // An interesting optimization for park() is to use a trylock()
5964 // to attempt to acquire the mutex. If the trylock() fails
5965 // then we know that a concurrent unpark() operation is in-progress.
5966 // in that case the park() code could simply set _count to 0
5967 // and return immediately. The subsequent park() operation *might*
5968 // return immediately. That's harmless as the caller of park() is
5969 // expected to loop. By using trylock() we will have avoided a
5970 // avoided a context switch caused by contention on the per-thread mutex.
5971 //
5972 // TODO-FIXME:
5973 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5974 // objectmonitor implementation.
5975 // 2. Collapse the JSR166 parker event, and the
5976 // objectmonitor ParkEvent into a single "Event" construct.
5977 // 3. In park() and unpark() add:
5978 // assert (Thread::current() == AssociatedWith).
5979 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5980 // 1-out-of-N park() operations will return immediately.
5981 //
5982 // _Event transitions in park()
5983 // -1 => -1 : illegal
5984 // 1 => 0 : pass - return immediately
5985 // 0 => -1 : block
5986 //
5987 // _Event serves as a restricted-range semaphore.
5988 //
5989 // Another possible encoding of _Event would be with
5990 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5991 //
5992 // TODO-FIXME: add DTRACE probes for:
5993 // 1. Tx parks
5994 // 2. Ty unparks Tx
5995 // 3. Tx resumes from park
5996
5997
5998 // value determined through experimentation
5999 #define ROUNDINGFIX 11
6000
6001 // utility to compute the abstime argument to timedwait.
6002 // TODO-FIXME: switch from compute_abstime() to unpackTime().
6003
6004 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
6005 // millis is the relative timeout time
6006 // abstime will be the absolute timeout time
6007 if (millis < 0) millis = 0;
6008 struct timeval now;
6009 int status = gettimeofday(&now, NULL);
6010 assert(status == 0, "gettimeofday");
6011 jlong seconds = millis / 1000;
6012 jlong max_wait_period;
6013
6014 if (UseLWPSynchronization) {
6015 // forward port of fix for 4275818 (not sleeping long enough)
6016 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
6017 // _lwp_cond_timedwait() used a round_down algorithm rather
6018 // than a round_up. For millis less than our roundfactor
6019 // it rounded down to 0 which doesn't meet the spec.
6020 // For millis > roundfactor we may return a bit sooner, but
6021 // since we can not accurately identify the patch level and
6022 // this has already been fixed in Solaris 9 and 8 we will
6023 // leave it alone rather than always rounding down.
6024
6025 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
6026 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
6027 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
6028 max_wait_period = 21000000;
6029 } else {
6030 max_wait_period = 50000000;
6031 }
6032 millis %= 1000;
6033 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
6034 seconds = max_wait_period;
6035 }
6036 abstime->tv_sec = now.tv_sec + seconds;
6037 long usec = now.tv_usec + millis * 1000;
6038 if (usec >= 1000000) {
6039 abstime->tv_sec += 1;
6040 usec -= 1000000;
6041 }
6042 abstime->tv_nsec = usec * 1000;
6043 return abstime;
6044 }
6045
6046 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
6047 // Conceptually TryPark() should be equivalent to park(0).
6048
6049 int os::PlatformEvent::TryPark() {
6050 for (;;) {
6051 const int v = _Event ;
6052 guarantee ((v == 0) || (v == 1), "invariant") ;
6053 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
6054 }
6055 }
6056
6057 void os::PlatformEvent::park() { // AKA: down()
6058 // Invariant: Only the thread associated with the Event/PlatformEvent
6059 // may call park().
6060 int v ;
6061 for (;;) {
6062 v = _Event ;
6063 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6064 }
6065 guarantee (v >= 0, "invariant") ;
6066 if (v == 0) {
6067 // Do this the hard way by blocking ...
6068 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6069 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6070 // Only for SPARC >= V8PlusA
6071 #if defined(__sparc) && defined(COMPILER2)
6072 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6073 #endif
6074 int status = os::Solaris::mutex_lock(_mutex);
6075 assert_status(status == 0, status, "mutex_lock");
6076 guarantee (_nParked == 0, "invariant") ;
6077 ++ _nParked ;
6078 while (_Event < 0) {
6079 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
6080 // Treat this the same as if the wait was interrupted
6081 // With usr/lib/lwp going to kernel, always handle ETIME
6082 status = os::Solaris::cond_wait(_cond, _mutex);
6083 if (status == ETIME) status = EINTR ;
6084 assert_status(status == 0 || status == EINTR, status, "cond_wait");
6085 }
6086 -- _nParked ;
6087 _Event = 0 ;
6088 status = os::Solaris::mutex_unlock(_mutex);
6089 assert_status(status == 0, status, "mutex_unlock");
6090 // Paranoia to ensure our locked and lock-free paths interact
6091 // correctly with each other.
6092 OrderAccess::fence();
6093 }
6094 }
6095
6096 int os::PlatformEvent::park(jlong millis) {
6097 guarantee (_nParked == 0, "invariant") ;
6098 int v ;
6099 for (;;) {
6100 v = _Event ;
6101 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6102 }
6103 guarantee (v >= 0, "invariant") ;
6104 if (v != 0) return OS_OK ;
6105
6106 int ret = OS_TIMEOUT;
6107 timestruc_t abst;
6108 compute_abstime (&abst, millis);
6109
6110 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6111 // For Solaris SPARC set fprs.FEF=0 prior to parking.
6112 // Only for SPARC >= V8PlusA
6113 #if defined(__sparc) && defined(COMPILER2)
6114 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6115 #endif
6116 int status = os::Solaris::mutex_lock(_mutex);
6117 assert_status(status == 0, status, "mutex_lock");
6118 guarantee (_nParked == 0, "invariant") ;
6119 ++ _nParked ;
6120 while (_Event < 0) {
6121 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
6122 assert_status(status == 0 || status == EINTR ||
6123 status == ETIME || status == ETIMEDOUT,
6124 status, "cond_timedwait");
6125 if (!FilterSpuriousWakeups) break ; // previous semantics
6126 if (status == ETIME || status == ETIMEDOUT) break ;
6127 // We consume and ignore EINTR and spurious wakeups.
6128 }
6129 -- _nParked ;
6130 if (_Event >= 0) ret = OS_OK ;
6131 _Event = 0 ;
6132 status = os::Solaris::mutex_unlock(_mutex);
6133 assert_status(status == 0, status, "mutex_unlock");
6134 // Paranoia to ensure our locked and lock-free paths interact
6135 // correctly with each other.
6136 OrderAccess::fence();
6137 return ret;
6138 }
6139
6140 void os::PlatformEvent::unpark() {
6141 // Transitions for _Event:
6142 // 0 :=> 1
6143 // 1 :=> 1
6144 // -1 :=> either 0 or 1; must signal target thread
6145 // That is, we can safely transition _Event from -1 to either
6146 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
6147 // unpark() calls.
6148 // See also: "Semaphores in Plan 9" by Mullender & Cox
6149 //
6150 // Note: Forcing a transition from "-1" to "1" on an unpark() means
6151 // that it will take two back-to-back park() calls for the owning
6152 // thread to block. This has the benefit of forcing a spurious return
6153 // from the first park() call after an unpark() call which will help
6154 // shake out uses of park() and unpark() without condition variables.
6155
6156 if (Atomic::xchg(1, &_Event) >= 0) return;
6157
6158 // If the thread associated with the event was parked, wake it.
6159 // Wait for the thread assoc with the PlatformEvent to vacate.
6160 int status = os::Solaris::mutex_lock(_mutex);
6161 assert_status(status == 0, status, "mutex_lock");
6162 int AnyWaiters = _nParked;
6163 status = os::Solaris::mutex_unlock(_mutex);
6164 assert_status(status == 0, status, "mutex_unlock");
6165 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
6166 if (AnyWaiters != 0) {
6167 // We intentional signal *after* dropping the lock
6168 // to avoid a common class of futile wakeups.
6169 status = os::Solaris::cond_signal(_cond);
6170 assert_status(status == 0, status, "cond_signal");
6171 }
6172 }
6173
6174 // JSR166
6175 // -------------------------------------------------------
6176
6177 /*
6178 * The solaris and linux implementations of park/unpark are fairly
6179 * conservative for now, but can be improved. They currently use a
6180 * mutex/condvar pair, plus _counter.
6181 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6182 * sets count to 1 and signals condvar. Only one thread ever waits
6183 * on the condvar. Contention seen when trying to park implies that someone
6184 * is unparking you, so don't wait. And spurious returns are fine, so there
6185 * is no need to track notifications.
6186 */
6187
6188 #define MAX_SECS 100000000
6189 /*
6190 * This code is common to linux and solaris and will be moved to a
6191 * common place in dolphin.
6192 *
6193 * The passed in time value is either a relative time in nanoseconds
6194 * or an absolute time in milliseconds. Either way it has to be unpacked
6195 * into suitable seconds and nanoseconds components and stored in the
6196 * given timespec structure.
6197 * Given time is a 64-bit value and the time_t used in the timespec is only
6198 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6199 * overflow if times way in the future are given. Further on Solaris versions
6200 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6201 * number of seconds, in abstime, is less than current_time + 100,000,000.
6202 * As it will be 28 years before "now + 100000000" will overflow we can
6203 * ignore overflow and just impose a hard-limit on seconds using the value
6204 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6205 * years from "now".
6206 */
6207 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6208 assert (time > 0, "convertTime");
6209
6210 struct timeval now;
6211 int status = gettimeofday(&now, NULL);
6212 assert(status == 0, "gettimeofday");
6213
6214 time_t max_secs = now.tv_sec + MAX_SECS;
6215
6216 if (isAbsolute) {
6217 jlong secs = time / 1000;
6218 if (secs > max_secs) {
6219 absTime->tv_sec = max_secs;
6220 }
6221 else {
6222 absTime->tv_sec = secs;
6223 }
6224 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6225 }
6226 else {
6227 jlong secs = time / NANOSECS_PER_SEC;
6228 if (secs >= MAX_SECS) {
6229 absTime->tv_sec = max_secs;
6230 absTime->tv_nsec = 0;
6231 }
6232 else {
6233 absTime->tv_sec = now.tv_sec + secs;
6234 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6235 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6236 absTime->tv_nsec -= NANOSECS_PER_SEC;
6237 ++absTime->tv_sec; // note: this must be <= max_secs
6238 }
6239 }
6240 }
6241 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6242 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6243 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6244 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6245 }
6246
6247 void Parker::park(bool isAbsolute, jlong time) {
6248 // Ideally we'd do something useful while spinning, such
6249 // as calling unpackTime().
6250
6251 // Optional fast-path check:
6252 // Return immediately if a permit is available.
6253 // We depend on Atomic::xchg() having full barrier semantics
6254 // since we are doing a lock-free update to _counter.
6255 if (Atomic::xchg(0, &_counter) > 0) return;
6256
6257 // Optional fast-exit: Check interrupt before trying to wait
6258 Thread* thread = Thread::current();
6259 assert(thread->is_Java_thread(), "Must be JavaThread");
6260 JavaThread *jt = (JavaThread *)thread;
6261 if (Thread::is_interrupted(thread, false)) {
6262 return;
6263 }
6264
6265 // First, demultiplex/decode time arguments
6266 timespec absTime;
6267 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6268 return;
6269 }
6270 if (time > 0) {
6271 // Warning: this code might be exposed to the old Solaris time
6272 // round-down bugs. Grep "roundingFix" for details.
6273 unpackTime(&absTime, isAbsolute, time);
6274 }
6275
6276 // Enter safepoint region
6277 // Beware of deadlocks such as 6317397.
6278 // The per-thread Parker:: _mutex is a classic leaf-lock.
6279 // In particular a thread must never block on the Threads_lock while
6280 // holding the Parker:: mutex. If safepoints are pending both the
6281 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6282 ThreadBlockInVM tbivm(jt);
6283
6284 // Don't wait if cannot get lock since interference arises from
6285 // unblocking. Also. check interrupt before trying wait
6286 if (Thread::is_interrupted(thread, false) ||
6287 os::Solaris::mutex_trylock(_mutex) != 0) {
6288 return;
6289 }
6290
6291 int status ;
6292
6293 if (_counter > 0) { // no wait needed
6294 _counter = 0;
6295 status = os::Solaris::mutex_unlock(_mutex);
6296 assert (status == 0, "invariant") ;
6297 // Paranoia to ensure our locked and lock-free paths interact
6298 // correctly with each other and Java-level accesses.
6299 OrderAccess::fence();
6300 return;
6301 }
6302
6303 #ifdef ASSERT
6304 // Don't catch signals while blocked; let the running threads have the signals.
6305 // (This allows a debugger to break into the running thread.)
6306 sigset_t oldsigs;
6307 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6308 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6309 #endif
6310
6311 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6312 jt->set_suspend_equivalent();
6313 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6314
6315 // Do this the hard way by blocking ...
6316 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6317 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6318 // Only for SPARC >= V8PlusA
6319 #if defined(__sparc) && defined(COMPILER2)
6320 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6321 #endif
6322
6323 if (time == 0) {
6324 status = os::Solaris::cond_wait (_cond, _mutex) ;
6325 } else {
6326 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6327 }
6328 // Note that an untimed cond_wait() can sometimes return ETIME on older
6329 // versions of the Solaris.
6330 assert_status(status == 0 || status == EINTR ||
6331 status == ETIME || status == ETIMEDOUT,
6332 status, "cond_timedwait");
6333
6334 #ifdef ASSERT
6335 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6336 #endif
6337 _counter = 0 ;
6338 status = os::Solaris::mutex_unlock(_mutex);
6339 assert_status(status == 0, status, "mutex_unlock") ;
6340 // Paranoia to ensure our locked and lock-free paths interact
6341 // correctly with each other and Java-level accesses.
6342 OrderAccess::fence();
6343
6344 // If externally suspended while waiting, re-suspend
6345 if (jt->handle_special_suspend_equivalent_condition()) {
6346 jt->java_suspend_self();
6347 }
6348 }
6349
6350 void Parker::unpark() {
6351 int s, status ;
6352 status = os::Solaris::mutex_lock (_mutex) ;
6353 assert (status == 0, "invariant") ;
6354 s = _counter;
6355 _counter = 1;
6356 status = os::Solaris::mutex_unlock (_mutex) ;
6357 assert (status == 0, "invariant") ;
6358
6359 if (s < 1) {
6360 status = os::Solaris::cond_signal (_cond) ;
6361 assert (status == 0, "invariant") ;
6362 }
6363 }
6364
6365 extern char** environ;
6366
6367 // Run the specified command in a separate process. Return its exit value,
6368 // or -1 on failure (e.g. can't fork a new process).
6369 // Unlike system(), this function can be called from signal handler. It
6370 // doesn't block SIGINT et al.
6371 int os::fork_and_exec(char* cmd) {
6372 char * argv[4];
6373 argv[0] = (char *)"sh";
6374 argv[1] = (char *)"-c";
6375 argv[2] = cmd;
6376 argv[3] = NULL;
6377
6378 // fork is async-safe, fork1 is not so can't use in signal handler
6379 pid_t pid;
6380 Thread* t = ThreadLocalStorage::get_thread_slow();
6381 if (t != NULL && t->is_inside_signal_handler()) {
6382 pid = fork();
6383 } else {
6384 pid = fork1();
6385 }
6386
6387 if (pid < 0) {
6388 // fork failed
6389 warning("fork failed: %s", strerror(errno));
6390 return -1;
6391
6392 } else if (pid == 0) {
6393 // child process
6394
6395 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6396 execve("/usr/bin/sh", argv, environ);
6397
6398 // execve failed
6399 _exit(-1);
6400
6401 } else {
6402 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6403 // care about the actual exit code, for now.
6404
6405 int status;
6406
6407 // Wait for the child process to exit. This returns immediately if
6408 // the child has already exited. */
6409 while (waitpid(pid, &status, 0) < 0) {
6410 switch (errno) {
6411 case ECHILD: return 0;
6412 case EINTR: break;
6413 default: return -1;
6414 }
6415 }
6416
6417 if (WIFEXITED(status)) {
6418 // The child exited normally; get its exit code.
6419 return WEXITSTATUS(status);
6420 } else if (WIFSIGNALED(status)) {
6421 // The child exited because of a signal
6422 // The best value to return is 0x80 + signal number,
6423 // because that is what all Unix shells do, and because
6424 // it allows callers to distinguish between process exit and
6425 // process death by signal.
6426 return 0x80 + WTERMSIG(status);
6427 } else {
6428 // Unknown exit code; pass it through
6429 return status;
6430 }
6431 }
6432 }
6433
6434 // is_headless_jre()
6435 //
6436 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6437 // in order to report if we are running in a headless jre
6438 //
6439 // Since JDK8 xawt/libmawt.so was moved into the same directory
6440 // as libawt.so, and renamed libawt_xawt.so
6441 //
6442 bool os::is_headless_jre() {
6443 struct stat statbuf;
6444 char buf[MAXPATHLEN];
6445 char libmawtpath[MAXPATHLEN];
6446 const char *xawtstr = "/xawt/libmawt.so";
6447 const char *new_xawtstr = "/libawt_xawt.so";
6448 char *p;
6449
6450 // Get path to libjvm.so
6451 os::jvm_path(buf, sizeof(buf));
6452
6453 // Get rid of libjvm.so
6454 p = strrchr(buf, '/');
6455 if (p == NULL) return false;
6456 else *p = '\0';
6457
6458 // Get rid of client or server
6459 p = strrchr(buf, '/');
6460 if (p == NULL) return false;
6461 else *p = '\0';
6462
6463 // check xawt/libmawt.so
6464 strcpy(libmawtpath, buf);
6465 strcat(libmawtpath, xawtstr);
6466 if (::stat(libmawtpath, &statbuf) == 0) return false;
6467
6468 // check libawt_xawt.so
6469 strcpy(libmawtpath, buf);
6470 strcat(libmawtpath, new_xawtstr);
6471 if (::stat(libmawtpath, &statbuf) == 0) return false;
6472
6473 return true;
6474 }
6475
6476 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6477 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6478 }
6479
6480 int os::close(int fd) {
6481 return ::close(fd);
6482 }
6483
6484 int os::socket_close(int fd) {
6485 return ::close(fd);
6486 }
6487
6488 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6489 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6490 }
6491
6492 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6493 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6494 }
6495
6496 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6497 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6498 }
6499
6500 // As both poll and select can be interrupted by signals, we have to be
6501 // prepared to restart the system call after updating the timeout, unless
6502 // a poll() is done with timeout == -1, in which case we repeat with this
6503 // "wait forever" value.
6504
6505 int os::timeout(int fd, long timeout) {
6506 int res;
6507 struct timeval t;
6508 julong prevtime, newtime;
6509 static const char* aNull = 0;
6510 struct pollfd pfd;
6511 pfd.fd = fd;
6512 pfd.events = POLLIN;
6513
6514 gettimeofday(&t, &aNull);
6515 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6516
6517 for(;;) {
6518 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6519 if(res == OS_ERR && errno == EINTR) {
6520 if(timeout != -1) {
6521 gettimeofday(&t, &aNull);
6522 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6523 timeout -= newtime - prevtime;
6524 if(timeout <= 0)
6525 return OS_OK;
6526 prevtime = newtime;
6527 }
6528 } else return res;
6529 }
6530 }
6531
6532 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6533 int _result;
6534 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6535 os::Solaris::clear_interrupted);
6536
6537 // Depending on when thread interruption is reset, _result could be
6538 // one of two values when errno == EINTR
6539
6540 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6541 && (errno == EINTR)) {
6542 /* restarting a connect() changes its errno semantics */
6543 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6544 os::Solaris::clear_interrupted);
6545 /* undo these changes */
6546 if (_result == OS_ERR) {
6547 if (errno == EALREADY) {
6548 errno = EINPROGRESS; /* fall through */
6549 } else if (errno == EISCONN) {
6550 errno = 0;
6551 return OS_OK;
6552 }
6553 }
6554 }
6555 return _result;
6556 }
6557
6558 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6559 if (fd < 0) {
6560 return OS_ERR;
6561 }
6562 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6563 os::Solaris::clear_interrupted);
6564 }
6565
6566 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6567 sockaddr* from, socklen_t* fromlen) {
6568 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6569 os::Solaris::clear_interrupted);
6570 }
6571
6572 int os::sendto(int fd, char* buf, size_t len, uint flags,
6573 struct sockaddr* to, socklen_t tolen) {
6574 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6575 os::Solaris::clear_interrupted);
6576 }
6577
6578 int os::socket_available(int fd, jint *pbytes) {
6579 if (fd < 0) {
6580 return OS_OK;
6581 }
6582 int ret;
6583 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6584 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6585 // is expected to return 0 on failure and 1 on success to the jdk.
6586 return (ret == OS_ERR) ? 0 : 1;
6587 }
6588
6589 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6590 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6591 os::Solaris::clear_interrupted);
6592 }
6593
6594 // Get the default path to the core file
6595 // Returns the length of the string
6596 int os::get_core_path(char* buffer, size_t bufferSize) {
6597 const char* p = get_current_directory(buffer, bufferSize);
6598
6599 if (p == NULL) {
6600 assert(p != NULL, "failed to get current directory");
6601 return 0;
6602 }
6603
6604 return strlen(buffer);
6605 }
6606
6607 #ifndef PRODUCT
6608 void TestReserveMemorySpecial_test() {
6609 // No tests available for this platform
6610 }
6611 #endif