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 int os::stat(const char *path, struct stat *sbuf) {
2150 char pathbuf[MAX_PATH];
2151 if (strlen(path) > MAX_PATH - 1) {
2152 errno = ENAMETOOLONG;
2153 return -1;
2154 }
2155 os::native_path(strcpy(pathbuf, path));
2156 return ::stat(pathbuf, sbuf);
2157 }
2158
2159 static bool _print_ascii_file(const char* filename, outputStream* st) {
2160 int fd = ::open(filename, O_RDONLY);
2161 if (fd == -1) {
2162 return false;
2163 }
2164
2165 char buf[32];
2166 int bytes;
2167 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2168 st->print_raw(buf, bytes);
2169 }
2170
2171 ::close(fd);
2172
2173 return true;
2174 }
2175
2176 void os::print_os_info_brief(outputStream* st) {
2177 os::Solaris::print_distro_info(st);
2178
2179 os::Posix::print_uname_info(st);
2180
2181 os::Solaris::print_libversion_info(st);
2182 }
2183
2184 void os::print_os_info(outputStream* st) {
2185 st->print("OS:");
2186
2187 os::Solaris::print_distro_info(st);
2188
2189 os::Posix::print_uname_info(st);
2190
2191 os::Solaris::print_libversion_info(st);
2192
2193 os::Posix::print_rlimit_info(st);
2194
2195 os::Posix::print_load_average(st);
2196 }
2197
2198 void os::Solaris::print_distro_info(outputStream* st) {
2199 if (!_print_ascii_file("/etc/release", st)) {
2200 st->print("Solaris");
2201 }
2202 st->cr();
2203 }
2204
2205 void os::Solaris::print_libversion_info(outputStream* st) {
2206 if (os::Solaris::T2_libthread()) {
2207 st->print(" (T2 libthread)");
2208 }
2209 else {
2210 st->print(" (T1 libthread)");
2211 }
2212 st->cr();
2213 }
2214
2215 static bool check_addr0(outputStream* st) {
2216 jboolean status = false;
2217 int fd = ::open("/proc/self/map",O_RDONLY);
2218 if (fd >= 0) {
2219 prmap_t p;
2220 while(::read(fd, &p, sizeof(p)) > 0) {
2221 if (p.pr_vaddr == 0x0) {
2222 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2223 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2224 st->print("Access:");
2225 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2226 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2227 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2228 st->cr();
2229 status = true;
2230 }
2231 ::close(fd);
2232 }
2233 }
2234 return status;
2235 }
2236
2237 void os::pd_print_cpu_info(outputStream* st) {
2238 // Nothing to do for now.
2239 }
2240
2241 void os::print_memory_info(outputStream* st) {
2242 st->print("Memory:");
2243 st->print(" %dk page", os::vm_page_size()>>10);
2244 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2245 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2246 st->cr();
2247 (void) check_addr0(st);
2248 }
2249
2250 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2251 // but they're the same for all the solaris architectures that we support.
2252 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2253 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2254 "ILL_COPROC", "ILL_BADSTK" };
2255
2256 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2257 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2258 "FPE_FLTINV", "FPE_FLTSUB" };
2259
2260 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2261
2262 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2263
2264 void os::print_siginfo(outputStream* st, void* siginfo) {
2265 st->print("siginfo:");
2266
2267 const int buflen = 100;
2268 char buf[buflen];
2269 siginfo_t *si = (siginfo_t*)siginfo;
2270 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2271 char *err = strerror(si->si_errno);
2272 if (si->si_errno != 0 && err != NULL) {
2273 st->print("si_errno=%s", err);
2274 } else {
2275 st->print("si_errno=%d", si->si_errno);
2276 }
2277 const int c = si->si_code;
2278 assert(c > 0, "unexpected si_code");
2279 switch (si->si_signo) {
2280 case SIGILL:
2281 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2282 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2283 break;
2284 case SIGFPE:
2285 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2286 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2287 break;
2288 case SIGSEGV:
2289 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2290 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2291 break;
2292 case SIGBUS:
2293 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2294 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2295 break;
2296 default:
2297 st->print(", si_code=%d", si->si_code);
2298 // no si_addr
2299 }
2300
2301 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2302 UseSharedSpaces) {
2303 FileMapInfo* mapinfo = FileMapInfo::current_info();
2304 if (mapinfo->is_in_shared_space(si->si_addr)) {
2305 st->print("\n\nError accessing class data sharing archive." \
2306 " Mapped file inaccessible during execution, " \
2307 " possible disk/network problem.");
2308 }
2309 }
2310 st->cr();
2311 }
2312
2313 // Moved from whole group, because we need them here for diagnostic
2314 // prints.
2315 #define OLDMAXSIGNUM 32
2316 static int Maxsignum = 0;
2317 static int *ourSigFlags = NULL;
2318
2319 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2320
2321 int os::Solaris::get_our_sigflags(int sig) {
2322 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2323 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2324 return ourSigFlags[sig];
2325 }
2326
2327 void os::Solaris::set_our_sigflags(int sig, int flags) {
2328 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2329 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2330 ourSigFlags[sig] = flags;
2331 }
2332
2333
2334 static const char* get_signal_handler_name(address handler,
2335 char* buf, int buflen) {
2336 int offset;
2337 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2338 if (found) {
2339 // skip directory names
2340 const char *p1, *p2;
2341 p1 = buf;
2342 size_t len = strlen(os::file_separator());
2343 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2344 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2345 } else {
2346 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2347 }
2348 return buf;
2349 }
2350
2351 static void print_signal_handler(outputStream* st, int sig,
2352 char* buf, size_t buflen) {
2353 struct sigaction sa;
2354
2355 sigaction(sig, NULL, &sa);
2356
2357 st->print("%s: ", os::exception_name(sig, buf, buflen));
2358
2359 address handler = (sa.sa_flags & SA_SIGINFO)
2360 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2361 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2362
2363 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2364 st->print("SIG_DFL");
2365 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2366 st->print("SIG_IGN");
2367 } else {
2368 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2369 }
2370
2371 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2372
2373 address rh = VMError::get_resetted_sighandler(sig);
2374 // May be, handler was resetted by VMError?
2375 if(rh != NULL) {
2376 handler = rh;
2377 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2378 }
2379
2380 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2381
2382 // Check: is it our handler?
2383 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2384 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2385 // It is our signal handler
2386 // check for flags
2387 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2388 st->print(
2389 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2390 os::Solaris::get_our_sigflags(sig));
2391 }
2392 }
2393 st->cr();
2394 }
2395
2396 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2397 st->print_cr("Signal Handlers:");
2398 print_signal_handler(st, SIGSEGV, buf, buflen);
2399 print_signal_handler(st, SIGBUS , buf, buflen);
2400 print_signal_handler(st, SIGFPE , buf, buflen);
2401 print_signal_handler(st, SIGPIPE, buf, buflen);
2402 print_signal_handler(st, SIGXFSZ, buf, buflen);
2403 print_signal_handler(st, SIGILL , buf, buflen);
2404 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2405 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2406 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2407 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2408 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2409 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2410 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2411 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2412 }
2413
2414 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2415
2416 // Find the full path to the current module, libjvm.so
2417 void os::jvm_path(char *buf, jint buflen) {
2418 // Error checking.
2419 if (buflen < MAXPATHLEN) {
2420 assert(false, "must use a large-enough buffer");
2421 buf[0] = '\0';
2422 return;
2423 }
2424 // Lazy resolve the path to current module.
2425 if (saved_jvm_path[0] != 0) {
2426 strcpy(buf, saved_jvm_path);
2427 return;
2428 }
2429
2430 Dl_info dlinfo;
2431 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2432 assert(ret != 0, "cannot locate libjvm");
2433 if (ret != 0 && dlinfo.dli_fname != NULL) {
2434 realpath((char *)dlinfo.dli_fname, buf);
2435 } else {
2436 buf[0] = '\0';
2437 return;
2438 }
2439
2440 if (Arguments::created_by_gamma_launcher()) {
2441 // Support for the gamma launcher. Typical value for buf is
2442 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2443 // the right place in the string, then assume we are installed in a JDK and
2444 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2445 // up the path so it looks like libjvm.so is installed there (append a
2446 // fake suffix hotspot/libjvm.so).
2447 const char *p = buf + strlen(buf) - 1;
2448 for (int count = 0; p > buf && count < 5; ++count) {
2449 for (--p; p > buf && *p != '/'; --p)
2450 /* empty */ ;
2451 }
2452
2453 if (strncmp(p, "/jre/lib/", 9) != 0) {
2454 // Look for JAVA_HOME in the environment.
2455 char* java_home_var = ::getenv("JAVA_HOME");
2456 if (java_home_var != NULL && java_home_var[0] != 0) {
2457 char cpu_arch[12];
2458 char* jrelib_p;
2459 int len;
2460 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2461 #ifdef _LP64
2462 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2463 if (strcmp(cpu_arch, "sparc") == 0) {
2464 strcat(cpu_arch, "v9");
2465 } else if (strcmp(cpu_arch, "i386") == 0) {
2466 strcpy(cpu_arch, "amd64");
2467 }
2468 #endif
2469 // Check the current module name "libjvm.so".
2470 p = strrchr(buf, '/');
2471 assert(strstr(p, "/libjvm") == p, "invalid library name");
2472
2473 realpath(java_home_var, buf);
2474 // determine if this is a legacy image or modules image
2475 // modules image doesn't have "jre" subdirectory
2476 len = strlen(buf);
2477 jrelib_p = buf + len;
2478 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2479 if (0 != access(buf, F_OK)) {
2480 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2481 }
2482
2483 if (0 == access(buf, F_OK)) {
2484 // Use current module name "libjvm.so"
2485 len = strlen(buf);
2486 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2487 } else {
2488 // Go back to path of .so
2489 realpath((char *)dlinfo.dli_fname, buf);
2490 }
2491 }
2492 }
2493 }
2494
2495 strcpy(saved_jvm_path, buf);
2496 }
2497
2498
2499 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2500 // no prefix required, not even "_"
2501 }
2502
2503
2504 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2505 // no suffix required
2506 }
2507
2508 // This method is a copy of JDK's sysGetLastErrorString
2509 // from src/solaris/hpi/src/system_md.c
2510
2511 size_t os::lasterror(char *buf, size_t len) {
2512
2513 if (errno == 0) return 0;
2514
2515 const char *s = ::strerror(errno);
2516 size_t n = ::strlen(s);
2517 if (n >= len) {
2518 n = len - 1;
2519 }
2520 ::strncpy(buf, s, n);
2521 buf[n] = '\0';
2522 return n;
2523 }
2524
2525
2526 // sun.misc.Signal
2527
2528 extern "C" {
2529 static void UserHandler(int sig, void *siginfo, void *context) {
2530 // Ctrl-C is pressed during error reporting, likely because the error
2531 // handler fails to abort. Let VM die immediately.
2532 if (sig == SIGINT && is_error_reported()) {
2533 os::die();
2534 }
2535
2536 os::signal_notify(sig);
2537 // We do not need to reinstate the signal handler each time...
2538 }
2539 }
2540
2541 void* os::user_handler() {
2542 return CAST_FROM_FN_PTR(void*, UserHandler);
2543 }
2544
2545 class Semaphore : public StackObj {
2546 public:
2547 Semaphore();
2548 ~Semaphore();
2549 void signal();
2550 void wait();
2551 bool trywait();
2552 bool timedwait(unsigned int sec, int nsec);
2553 private:
2554 sema_t _semaphore;
2555 };
2556
2557
2558 Semaphore::Semaphore() {
2559 sema_init(&_semaphore, 0, NULL, NULL);
2560 }
2561
2562 Semaphore::~Semaphore() {
2563 sema_destroy(&_semaphore);
2564 }
2565
2566 void Semaphore::signal() {
2567 sema_post(&_semaphore);
2568 }
2569
2570 void Semaphore::wait() {
2571 sema_wait(&_semaphore);
2572 }
2573
2574 bool Semaphore::trywait() {
2575 return sema_trywait(&_semaphore) == 0;
2576 }
2577
2578 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2579 struct timespec ts;
2580 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2581
2582 while (1) {
2583 int result = sema_timedwait(&_semaphore, &ts);
2584 if (result == 0) {
2585 return true;
2586 } else if (errno == EINTR) {
2587 continue;
2588 } else if (errno == ETIME) {
2589 return false;
2590 } else {
2591 return false;
2592 }
2593 }
2594 }
2595
2596 extern "C" {
2597 typedef void (*sa_handler_t)(int);
2598 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2599 }
2600
2601 void* os::signal(int signal_number, void* handler) {
2602 struct sigaction sigAct, oldSigAct;
2603 sigfillset(&(sigAct.sa_mask));
2604 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2605 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2606
2607 if (sigaction(signal_number, &sigAct, &oldSigAct))
2608 // -1 means registration failed
2609 return (void *)-1;
2610
2611 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2612 }
2613
2614 void os::signal_raise(int signal_number) {
2615 raise(signal_number);
2616 }
2617
2618 /*
2619 * The following code is moved from os.cpp for making this
2620 * code platform specific, which it is by its very nature.
2621 */
2622
2623 // a counter for each possible signal value
2624 static int Sigexit = 0;
2625 static int Maxlibjsigsigs;
2626 static jint *pending_signals = NULL;
2627 static int *preinstalled_sigs = NULL;
2628 static struct sigaction *chainedsigactions = NULL;
2629 static sema_t sig_sem;
2630 typedef int (*version_getting_t)();
2631 version_getting_t os::Solaris::get_libjsig_version = NULL;
2632 static int libjsigversion = NULL;
2633
2634 int os::sigexitnum_pd() {
2635 assert(Sigexit > 0, "signal memory not yet initialized");
2636 return Sigexit;
2637 }
2638
2639 void os::Solaris::init_signal_mem() {
2640 // Initialize signal structures
2641 Maxsignum = SIGRTMAX;
2642 Sigexit = Maxsignum+1;
2643 assert(Maxsignum >0, "Unable to obtain max signal number");
2644
2645 Maxlibjsigsigs = Maxsignum;
2646
2647 // pending_signals has one int per signal
2648 // The additional signal is for SIGEXIT - exit signal to signal_thread
2649 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2650 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2651
2652 if (UseSignalChaining) {
2653 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2654 * (Maxsignum + 1), mtInternal);
2655 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2656 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2657 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2658 }
2659 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2660 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2661 }
2662
2663 void os::signal_init_pd() {
2664 int ret;
2665
2666 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2667 assert(ret == 0, "sema_init() failed");
2668 }
2669
2670 void os::signal_notify(int signal_number) {
2671 int ret;
2672
2673 Atomic::inc(&pending_signals[signal_number]);
2674 ret = ::sema_post(&sig_sem);
2675 assert(ret == 0, "sema_post() failed");
2676 }
2677
2678 static int check_pending_signals(bool wait_for_signal) {
2679 int ret;
2680 while (true) {
2681 for (int i = 0; i < Sigexit + 1; i++) {
2682 jint n = pending_signals[i];
2683 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2684 return i;
2685 }
2686 }
2687 if (!wait_for_signal) {
2688 return -1;
2689 }
2690 JavaThread *thread = JavaThread::current();
2691 ThreadBlockInVM tbivm(thread);
2692
2693 bool threadIsSuspended;
2694 do {
2695 thread->set_suspend_equivalent();
2696 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2697 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2698 ;
2699 assert(ret == 0, "sema_wait() failed");
2700
2701 // were we externally suspended while we were waiting?
2702 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2703 if (threadIsSuspended) {
2704 //
2705 // The semaphore has been incremented, but while we were waiting
2706 // another thread suspended us. We don't want to continue running
2707 // while suspended because that would surprise the thread that
2708 // suspended us.
2709 //
2710 ret = ::sema_post(&sig_sem);
2711 assert(ret == 0, "sema_post() failed");
2712
2713 thread->java_suspend_self();
2714 }
2715 } while (threadIsSuspended);
2716 }
2717 }
2718
2719 int os::signal_lookup() {
2720 return check_pending_signals(false);
2721 }
2722
2723 int os::signal_wait() {
2724 return check_pending_signals(true);
2725 }
2726
2727 ////////////////////////////////////////////////////////////////////////////////
2728 // Virtual Memory
2729
2730 static int page_size = -1;
2731
2732 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2733 // clear this var if support is not available.
2734 static bool has_map_align = true;
2735
2736 int os::vm_page_size() {
2737 assert(page_size != -1, "must call os::init");
2738 return page_size;
2739 }
2740
2741 // Solaris allocates memory by pages.
2742 int os::vm_allocation_granularity() {
2743 assert(page_size != -1, "must call os::init");
2744 return page_size;
2745 }
2746
2747 static bool recoverable_mmap_error(int err) {
2748 // See if the error is one we can let the caller handle. This
2749 // list of errno values comes from the Solaris mmap(2) man page.
2750 switch (err) {
2751 case EBADF:
2752 case EINVAL:
2753 case ENOTSUP:
2754 // let the caller deal with these errors
2755 return true;
2756
2757 default:
2758 // Any remaining errors on this OS can cause our reserved mapping
2759 // to be lost. That can cause confusion where different data
2760 // structures think they have the same memory mapped. The worst
2761 // scenario is if both the VM and a library think they have the
2762 // same memory mapped.
2763 return false;
2764 }
2765 }
2766
2767 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2768 int err) {
2769 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2770 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2771 strerror(err), err);
2772 }
2773
2774 static void warn_fail_commit_memory(char* addr, size_t bytes,
2775 size_t alignment_hint, bool exec,
2776 int err) {
2777 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2778 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2779 alignment_hint, exec, strerror(err), err);
2780 }
2781
2782 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2783 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2784 size_t size = bytes;
2785 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2786 if (res != NULL) {
2787 if (UseNUMAInterleaving) {
2788 numa_make_global(addr, bytes);
2789 }
2790 return 0;
2791 }
2792
2793 int err = errno; // save errno from mmap() call in mmap_chunk()
2794
2795 if (!recoverable_mmap_error(err)) {
2796 warn_fail_commit_memory(addr, bytes, exec, err);
2797 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2798 }
2799
2800 return err;
2801 }
2802
2803 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2804 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2805 }
2806
2807 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2808 const char* mesg) {
2809 assert(mesg != NULL, "mesg must be specified");
2810 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2811 if (err != 0) {
2812 // the caller wants all commit errors to exit with the specified mesg:
2813 warn_fail_commit_memory(addr, bytes, exec, err);
2814 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2815 }
2816 }
2817
2818 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2819 size_t alignment_hint, bool exec) {
2820 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2821 if (err == 0) {
2822 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) {
2823 // If the large page size has been set and the VM
2824 // is using large pages, use the large page size
2825 // if it is smaller than the alignment hint. This is
2826 // a case where the VM wants to use a larger alignment size
2827 // for its own reasons but still want to use large pages
2828 // (which is what matters to setting the mpss range.
2829 size_t page_size = 0;
2830 if (large_page_size() < alignment_hint) {
2831 assert(UseLargePages, "Expected to be here for large page use only");
2832 page_size = large_page_size();
2833 } else {
2834 // If the alignment hint is less than the large page
2835 // size, the VM wants a particular alignment (thus the hint)
2836 // for internal reasons. Try to set the mpss range using
2837 // the alignment_hint.
2838 page_size = alignment_hint;
2839 }
2840 // Since this is a hint, ignore any failures.
2841 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2842 }
2843 }
2844 return err;
2845 }
2846
2847 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2848 bool exec) {
2849 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2850 }
2851
2852 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2853 size_t alignment_hint, bool exec,
2854 const char* mesg) {
2855 assert(mesg != NULL, "mesg must be specified");
2856 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2857 if (err != 0) {
2858 // the caller wants all commit errors to exit with the specified mesg:
2859 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2860 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2861 }
2862 }
2863
2864 // Uncommit the pages in a specified region.
2865 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2866 if (madvise(addr, bytes, MADV_FREE) < 0) {
2867 debug_only(warning("MADV_FREE failed."));
2868 return;
2869 }
2870 }
2871
2872 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2873 return os::commit_memory(addr, size, !ExecMem);
2874 }
2875
2876 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2877 return os::uncommit_memory(addr, size);
2878 }
2879
2880 // Change the page size in a given range.
2881 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2882 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2883 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2884 if (UseLargePages) {
2885 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2886 }
2887 }
2888
2889 // Tell the OS to make the range local to the first-touching LWP
2890 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2891 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2892 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2893 debug_only(warning("MADV_ACCESS_LWP failed."));
2894 }
2895 }
2896
2897 // Tell the OS that this range would be accessed from different LWPs.
2898 void os::numa_make_global(char *addr, size_t bytes) {
2899 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2900 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2901 debug_only(warning("MADV_ACCESS_MANY failed."));
2902 }
2903 }
2904
2905 // Get the number of the locality groups.
2906 size_t os::numa_get_groups_num() {
2907 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2908 return n != -1 ? n : 1;
2909 }
2910
2911 // Get a list of leaf locality groups. A leaf lgroup is group that
2912 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2913 // board. An LWP is assigned to one of these groups upon creation.
2914 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2915 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2916 ids[0] = 0;
2917 return 1;
2918 }
2919 int result_size = 0, top = 1, bottom = 0, cur = 0;
2920 for (int k = 0; k < size; k++) {
2921 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2922 (Solaris::lgrp_id_t*)&ids[top], size - top);
2923 if (r == -1) {
2924 ids[0] = 0;
2925 return 1;
2926 }
2927 if (!r) {
2928 // That's a leaf node.
2929 assert (bottom <= cur, "Sanity check");
2930 // Check if the node has memory
2931 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2932 NULL, 0, LGRP_RSRC_MEM) > 0) {
2933 ids[bottom++] = ids[cur];
2934 }
2935 }
2936 top += r;
2937 cur++;
2938 }
2939 if (bottom == 0) {
2940 // Handle a situation, when the OS reports no memory available.
2941 // Assume UMA architecture.
2942 ids[0] = 0;
2943 return 1;
2944 }
2945 return bottom;
2946 }
2947
2948 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2949 bool os::numa_topology_changed() {
2950 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2951 if (is_stale != -1 && is_stale) {
2952 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2953 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2954 assert(c != 0, "Failure to initialize LGRP API");
2955 Solaris::set_lgrp_cookie(c);
2956 return true;
2957 }
2958 return false;
2959 }
2960
2961 // Get the group id of the current LWP.
2962 int os::numa_get_group_id() {
2963 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2964 if (lgrp_id == -1) {
2965 return 0;
2966 }
2967 const int size = os::numa_get_groups_num();
2968 int *ids = (int*)alloca(size * sizeof(int));
2969
2970 // Get the ids of all lgroups with memory; r is the count.
2971 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2972 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2973 if (r <= 0) {
2974 return 0;
2975 }
2976 return ids[os::random() % r];
2977 }
2978
2979 // Request information about the page.
2980 bool os::get_page_info(char *start, page_info* info) {
2981 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2982 uint64_t addr = (uintptr_t)start;
2983 uint64_t outdata[2];
2984 uint_t validity = 0;
2985
2986 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2987 return false;
2988 }
2989
2990 info->size = 0;
2991 info->lgrp_id = -1;
2992
2993 if ((validity & 1) != 0) {
2994 if ((validity & 2) != 0) {
2995 info->lgrp_id = outdata[0];
2996 }
2997 if ((validity & 4) != 0) {
2998 info->size = outdata[1];
2999 }
3000 return true;
3001 }
3002 return false;
3003 }
3004
3005 // Scan the pages from start to end until a page different than
3006 // the one described in the info parameter is encountered.
3007 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3008 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
3009 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
3010 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
3011 uint_t validity[MAX_MEMINFO_CNT];
3012
3013 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
3014 uint64_t p = (uint64_t)start;
3015 while (p < (uint64_t)end) {
3016 addrs[0] = p;
3017 size_t addrs_count = 1;
3018 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
3019 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
3020 addrs_count++;
3021 }
3022
3023 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
3024 return NULL;
3025 }
3026
3027 size_t i = 0;
3028 for (; i < addrs_count; i++) {
3029 if ((validity[i] & 1) != 0) {
3030 if ((validity[i] & 4) != 0) {
3031 if (outdata[types * i + 1] != page_expected->size) {
3032 break;
3033 }
3034 } else
3035 if (page_expected->size != 0) {
3036 break;
3037 }
3038
3039 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
3040 if (outdata[types * i] != page_expected->lgrp_id) {
3041 break;
3042 }
3043 }
3044 } else {
3045 return NULL;
3046 }
3047 }
3048
3049 if (i != addrs_count) {
3050 if ((validity[i] & 2) != 0) {
3051 page_found->lgrp_id = outdata[types * i];
3052 } else {
3053 page_found->lgrp_id = -1;
3054 }
3055 if ((validity[i] & 4) != 0) {
3056 page_found->size = outdata[types * i + 1];
3057 } else {
3058 page_found->size = 0;
3059 }
3060 return (char*)addrs[i];
3061 }
3062
3063 p = addrs[addrs_count - 1] + page_size;
3064 }
3065 return end;
3066 }
3067
3068 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3069 size_t size = bytes;
3070 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3071 // uncommitted page. Otherwise, the read/write might succeed if we
3072 // have enough swap space to back the physical page.
3073 return
3074 NULL != Solaris::mmap_chunk(addr, size,
3075 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
3076 PROT_NONE);
3077 }
3078
3079 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
3080 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
3081
3082 if (b == MAP_FAILED) {
3083 return NULL;
3084 }
3085 return b;
3086 }
3087
3088 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3089 char* addr = requested_addr;
3090 int flags = MAP_PRIVATE | MAP_NORESERVE;
3091
3092 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3093
3094 if (fixed) {
3095 flags |= MAP_FIXED;
3096 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3097 flags |= MAP_ALIGN;
3098 addr = (char*) alignment_hint;
3099 }
3100
3101 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3102 // uncommitted page. Otherwise, the read/write might succeed if we
3103 // have enough swap space to back the physical page.
3104 return mmap_chunk(addr, bytes, flags, PROT_NONE);
3105 }
3106
3107 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3108 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3109
3110 guarantee(requested_addr == NULL || requested_addr == addr,
3111 "OS failed to return requested mmap address.");
3112 return addr;
3113 }
3114
3115 // Reserve memory at an arbitrary address, only if that area is
3116 // available (and not reserved for something else).
3117
3118 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3119 const int max_tries = 10;
3120 char* base[max_tries];
3121 size_t size[max_tries];
3122
3123 // Solaris adds a gap between mmap'ed regions. The size of the gap
3124 // is dependent on the requested size and the MMU. Our initial gap
3125 // value here is just a guess and will be corrected later.
3126 bool had_top_overlap = false;
3127 bool have_adjusted_gap = false;
3128 size_t gap = 0x400000;
3129
3130 // Assert only that the size is a multiple of the page size, since
3131 // that's all that mmap requires, and since that's all we really know
3132 // about at this low abstraction level. If we need higher alignment,
3133 // we can either pass an alignment to this method or verify alignment
3134 // in one of the methods further up the call chain. See bug 5044738.
3135 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3136
3137 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3138 // Give it a try, if the kernel honors the hint we can return immediately.
3139 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3140
3141 volatile int err = errno;
3142 if (addr == requested_addr) {
3143 return addr;
3144 } else if (addr != NULL) {
3145 pd_unmap_memory(addr, bytes);
3146 }
3147
3148 if (PrintMiscellaneous && Verbose) {
3149 char buf[256];
3150 buf[0] = '\0';
3151 if (addr == NULL) {
3152 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3153 }
3154 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3155 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3156 "%s", bytes, requested_addr, addr, buf);
3157 }
3158
3159 // Address hint method didn't work. Fall back to the old method.
3160 // In theory, once SNV becomes our oldest supported platform, this
3161 // code will no longer be needed.
3162 //
3163 // Repeatedly allocate blocks until the block is allocated at the
3164 // right spot. Give up after max_tries.
3165 int i;
3166 for (i = 0; i < max_tries; ++i) {
3167 base[i] = reserve_memory(bytes);
3168
3169 if (base[i] != NULL) {
3170 // Is this the block we wanted?
3171 if (base[i] == requested_addr) {
3172 size[i] = bytes;
3173 break;
3174 }
3175
3176 // check that the gap value is right
3177 if (had_top_overlap && !have_adjusted_gap) {
3178 size_t actual_gap = base[i-1] - base[i] - bytes;
3179 if (gap != actual_gap) {
3180 // adjust the gap value and retry the last 2 allocations
3181 assert(i > 0, "gap adjustment code problem");
3182 have_adjusted_gap = true; // adjust the gap only once, just in case
3183 gap = actual_gap;
3184 if (PrintMiscellaneous && Verbose) {
3185 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3186 }
3187 unmap_memory(base[i], bytes);
3188 unmap_memory(base[i-1], size[i-1]);
3189 i-=2;
3190 continue;
3191 }
3192 }
3193
3194 // Does this overlap the block we wanted? Give back the overlapped
3195 // parts and try again.
3196 //
3197 // There is still a bug in this code: if top_overlap == bytes,
3198 // the overlap is offset from requested region by the value of gap.
3199 // In this case giving back the overlapped part will not work,
3200 // because we'll give back the entire block at base[i] and
3201 // therefore the subsequent allocation will not generate a new gap.
3202 // This could be fixed with a new algorithm that used larger
3203 // or variable size chunks to find the requested region -
3204 // but such a change would introduce additional complications.
3205 // It's rare enough that the planets align for this bug,
3206 // so we'll just wait for a fix for 6204603/5003415 which
3207 // will provide a mmap flag to allow us to avoid this business.
3208
3209 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3210 if (top_overlap >= 0 && top_overlap < bytes) {
3211 had_top_overlap = true;
3212 unmap_memory(base[i], top_overlap);
3213 base[i] += top_overlap;
3214 size[i] = bytes - top_overlap;
3215 } else {
3216 size_t bottom_overlap = base[i] + bytes - requested_addr;
3217 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3218 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3219 warning("attempt_reserve_memory_at: possible alignment bug");
3220 }
3221 unmap_memory(requested_addr, bottom_overlap);
3222 size[i] = bytes - bottom_overlap;
3223 } else {
3224 size[i] = bytes;
3225 }
3226 }
3227 }
3228 }
3229
3230 // Give back the unused reserved pieces.
3231
3232 for (int j = 0; j < i; ++j) {
3233 if (base[j] != NULL) {
3234 unmap_memory(base[j], size[j]);
3235 }
3236 }
3237
3238 return (i < max_tries) ? requested_addr : NULL;
3239 }
3240
3241 bool os::pd_release_memory(char* addr, size_t bytes) {
3242 size_t size = bytes;
3243 return munmap(addr, size) == 0;
3244 }
3245
3246 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3247 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3248 "addr must be page aligned");
3249 int retVal = mprotect(addr, bytes, prot);
3250 return retVal == 0;
3251 }
3252
3253 // Protect memory (Used to pass readonly pages through
3254 // JNI GetArray<type>Elements with empty arrays.)
3255 // Also, used for serialization page and for compressed oops null pointer
3256 // checking.
3257 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3258 bool is_committed) {
3259 unsigned int p = 0;
3260 switch (prot) {
3261 case MEM_PROT_NONE: p = PROT_NONE; break;
3262 case MEM_PROT_READ: p = PROT_READ; break;
3263 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3264 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3265 default:
3266 ShouldNotReachHere();
3267 }
3268 // is_committed is unused.
3269 return solaris_mprotect(addr, bytes, p);
3270 }
3271
3272 // guard_memory and unguard_memory only happens within stack guard pages.
3273 // Since ISM pertains only to the heap, guard and unguard memory should not
3274 /// happen with an ISM region.
3275 bool os::guard_memory(char* addr, size_t bytes) {
3276 return solaris_mprotect(addr, bytes, PROT_NONE);
3277 }
3278
3279 bool os::unguard_memory(char* addr, size_t bytes) {
3280 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3281 }
3282
3283 // Large page support
3284 static size_t _large_page_size = 0;
3285
3286 // Insertion sort for small arrays (descending order).
3287 static void insertion_sort_descending(size_t* array, int len) {
3288 for (int i = 0; i < len; i++) {
3289 size_t val = array[i];
3290 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3291 size_t tmp = array[key];
3292 array[key] = array[key - 1];
3293 array[key - 1] = tmp;
3294 }
3295 }
3296 }
3297
3298 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3299 const unsigned int usable_count = VM_Version::page_size_count();
3300 if (usable_count == 1) {
3301 return false;
3302 }
3303
3304 // Find the right getpagesizes interface. When solaris 11 is the minimum
3305 // build platform, getpagesizes() (without the '2') can be called directly.
3306 typedef int (*gps_t)(size_t[], int);
3307 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3308 if (gps_func == NULL) {
3309 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3310 if (gps_func == NULL) {
3311 if (warn) {
3312 warning("MPSS is not supported by the operating system.");
3313 }
3314 return false;
3315 }
3316 }
3317
3318 // Fill the array of page sizes.
3319 int n = (*gps_func)(_page_sizes, page_sizes_max);
3320 assert(n > 0, "Solaris bug?");
3321
3322 if (n == page_sizes_max) {
3323 // Add a sentinel value (necessary only if the array was completely filled
3324 // since it is static (zeroed at initialization)).
3325 _page_sizes[--n] = 0;
3326 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3327 }
3328 assert(_page_sizes[n] == 0, "missing sentinel");
3329 trace_page_sizes("available page sizes", _page_sizes, n);
3330
3331 if (n == 1) return false; // Only one page size available.
3332
3333 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3334 // select up to usable_count elements. First sort the array, find the first
3335 // acceptable value, then copy the usable sizes to the top of the array and
3336 // trim the rest. Make sure to include the default page size :-).
3337 //
3338 // A better policy could get rid of the 4M limit by taking the sizes of the
3339 // important VM memory regions (java heap and possibly the code cache) into
3340 // account.
3341 insertion_sort_descending(_page_sizes, n);
3342 const size_t size_limit =
3343 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3344 int beg;
3345 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3346 const int end = MIN2((int)usable_count, n) - 1;
3347 for (int cur = 0; cur < end; ++cur, ++beg) {
3348 _page_sizes[cur] = _page_sizes[beg];
3349 }
3350 _page_sizes[end] = vm_page_size();
3351 _page_sizes[end + 1] = 0;
3352
3353 if (_page_sizes[end] > _page_sizes[end - 1]) {
3354 // Default page size is not the smallest; sort again.
3355 insertion_sort_descending(_page_sizes, end + 1);
3356 }
3357 *page_size = _page_sizes[0];
3358
3359 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3360 return true;
3361 }
3362
3363 void os::large_page_init() {
3364 if (UseLargePages) {
3365 // print a warning if any large page related flag is specified on command line
3366 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3367 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3368
3369 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3370 }
3371 }
3372
3373 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3374 // Signal to OS that we want large pages for addresses
3375 // from addr, addr + bytes
3376 struct memcntl_mha mpss_struct;
3377 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3378 mpss_struct.mha_pagesize = align;
3379 mpss_struct.mha_flags = 0;
3380 // Upon successful completion, memcntl() returns 0
3381 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3382 debug_only(warning("Attempt to use MPSS failed."));
3383 return false;
3384 }
3385 return true;
3386 }
3387
3388 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3389 fatal("os::reserve_memory_special should not be called on Solaris.");
3390 return NULL;
3391 }
3392
3393 bool os::release_memory_special(char* base, size_t bytes) {
3394 fatal("os::release_memory_special should not be called on Solaris.");
3395 return false;
3396 }
3397
3398 size_t os::large_page_size() {
3399 return _large_page_size;
3400 }
3401
3402 // MPSS allows application to commit large page memory on demand; with ISM
3403 // the entire memory region must be allocated as shared memory.
3404 bool os::can_commit_large_page_memory() {
3405 return true;
3406 }
3407
3408 bool os::can_execute_large_page_memory() {
3409 return true;
3410 }
3411
3412 static int os_sleep(jlong millis, bool interruptible) {
3413 const jlong limit = INT_MAX;
3414 jlong prevtime;
3415 int res;
3416
3417 while (millis > limit) {
3418 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3419 return res;
3420 millis -= limit;
3421 }
3422
3423 // Restart interrupted polls with new parameters until the proper delay
3424 // has been completed.
3425
3426 prevtime = getTimeMillis();
3427
3428 while (millis > 0) {
3429 jlong newtime;
3430
3431 if (!interruptible) {
3432 // Following assert fails for os::yield_all:
3433 // assert(!thread->is_Java_thread(), "must not be java thread");
3434 res = poll(NULL, 0, millis);
3435 } else {
3436 JavaThread *jt = JavaThread::current();
3437
3438 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3439 os::Solaris::clear_interrupted);
3440 }
3441
3442 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3443 // thread.Interrupt.
3444
3445 // See c/r 6751923. Poll can return 0 before time
3446 // has elapsed if time is set via clock_settime (as NTP does).
3447 // res == 0 if poll timed out (see man poll RETURN VALUES)
3448 // using the logic below checks that we really did
3449 // sleep at least "millis" if not we'll sleep again.
3450 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3451 newtime = getTimeMillis();
3452 assert(newtime >= prevtime, "time moving backwards");
3453 /* Doing prevtime and newtime in microseconds doesn't help precision,
3454 and trying to round up to avoid lost milliseconds can result in a
3455 too-short delay. */
3456 millis -= newtime - prevtime;
3457 if(millis <= 0)
3458 return OS_OK;
3459 prevtime = newtime;
3460 } else
3461 return res;
3462 }
3463
3464 return OS_OK;
3465 }
3466
3467 // Read calls from inside the vm need to perform state transitions
3468 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3469 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3470 }
3471
3472 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3473 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3474 }
3475
3476 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3477 assert(thread == Thread::current(), "thread consistency check");
3478
3479 // TODO-FIXME: this should be removed.
3480 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3481 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3482 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3483 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3484 // is fooled into believing that the system is making progress. In the code below we block the
3485 // the watcher thread while safepoint is in progress so that it would not appear as though the
3486 // system is making progress.
3487 if (!Solaris::T2_libthread() &&
3488 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3489 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3490 // the entire safepoint, the watcher thread will line up here during the safepoint.
3491 Threads_lock->lock_without_safepoint_check();
3492 Threads_lock->unlock();
3493 }
3494
3495 if (thread->is_Java_thread()) {
3496 // This is a JavaThread so we honor the _thread_blocked protocol
3497 // even for sleeps of 0 milliseconds. This was originally done
3498 // as a workaround for bug 4338139. However, now we also do it
3499 // to honor the suspend-equivalent protocol.
3500
3501 JavaThread *jt = (JavaThread *) thread;
3502 ThreadBlockInVM tbivm(jt);
3503
3504 jt->set_suspend_equivalent();
3505 // cleared by handle_special_suspend_equivalent_condition() or
3506 // java_suspend_self() via check_and_wait_while_suspended()
3507
3508 int ret_code;
3509 if (millis <= 0) {
3510 thr_yield();
3511 ret_code = 0;
3512 } else {
3513 // The original sleep() implementation did not create an
3514 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3515 // I'm preserving that decision for now.
3516 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3517
3518 ret_code = os_sleep(millis, interruptible);
3519 }
3520
3521 // were we externally suspended while we were waiting?
3522 jt->check_and_wait_while_suspended();
3523
3524 return ret_code;
3525 }
3526
3527 // non-JavaThread from this point on:
3528
3529 if (millis <= 0) {
3530 thr_yield();
3531 return 0;
3532 }
3533
3534 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3535
3536 return os_sleep(millis, interruptible);
3537 }
3538
3539 int os::naked_sleep() {
3540 // %% make the sleep time an integer flag. for now use 1 millisec.
3541 return os_sleep(1, false);
3542 }
3543
3544 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3545 void os::infinite_sleep() {
3546 while (true) { // sleep forever ...
3547 ::sleep(100); // ... 100 seconds at a time
3548 }
3549 }
3550
3551 // Used to convert frequent JVM_Yield() to nops
3552 bool os::dont_yield() {
3553 if (DontYieldALot) {
3554 static hrtime_t last_time = 0;
3555 hrtime_t diff = getTimeNanos() - last_time;
3556
3557 if (diff < DontYieldALotInterval * 1000000)
3558 return true;
3559
3560 last_time += diff;
3561
3562 return false;
3563 }
3564 else {
3565 return false;
3566 }
3567 }
3568
3569 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3570 // the linux and win32 implementations do not. This should be checked.
3571
3572 void os::yield() {
3573 // Yields to all threads with same or greater priority
3574 os::sleep(Thread::current(), 0, false);
3575 }
3576
3577 // Note that yield semantics are defined by the scheduling class to which
3578 // the thread currently belongs. Typically, yield will _not yield to
3579 // other equal or higher priority threads that reside on the dispatch queues
3580 // of other CPUs.
3581
3582 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3583
3584
3585 // On Solaris we found that yield_all doesn't always yield to all other threads.
3586 // There have been cases where there is a thread ready to execute but it doesn't
3587 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3588 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3589 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3590 // number of times yield_all is called in the one loop and increase the sleep
3591 // time after 8 attempts. If this fails too we increase the concurrency level
3592 // so that the starving thread would get an lwp
3593
3594 void os::yield_all(int attempts) {
3595 // Yields to all threads, including threads with lower priorities
3596 if (attempts == 0) {
3597 os::sleep(Thread::current(), 1, false);
3598 } else {
3599 int iterations = attempts % 30;
3600 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3601 // thr_setconcurrency and _getconcurrency make sense only under T1.
3602 int noofLWPS = thr_getconcurrency();
3603 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3604 thr_setconcurrency(thr_getconcurrency() + 1);
3605 }
3606 } else if (iterations < 25) {
3607 os::sleep(Thread::current(), 1, false);
3608 } else {
3609 os::sleep(Thread::current(), 10, false);
3610 }
3611 }
3612 }
3613
3614 // Called from the tight loops to possibly influence time-sharing heuristics
3615 void os::loop_breaker(int attempts) {
3616 os::yield_all(attempts);
3617 }
3618
3619
3620 // Interface for setting lwp priorities. If we are using T2 libthread,
3621 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3622 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3623 // function is meaningless in this mode so we must adjust the real lwp's priority
3624 // The routines below implement the getting and setting of lwp priorities.
3625 //
3626 // Note: There are three priority scales used on Solaris. Java priotities
3627 // which range from 1 to 10, libthread "thr_setprio" scale which range
3628 // from 0 to 127, and the current scheduling class of the process we
3629 // are running in. This is typically from -60 to +60.
3630 // The setting of the lwp priorities in done after a call to thr_setprio
3631 // so Java priorities are mapped to libthread priorities and we map from
3632 // the latter to lwp priorities. We don't keep priorities stored in
3633 // Java priorities since some of our worker threads want to set priorities
3634 // higher than all Java threads.
3635 //
3636 // For related information:
3637 // (1) man -s 2 priocntl
3638 // (2) man -s 4 priocntl
3639 // (3) man dispadmin
3640 // = librt.so
3641 // = libthread/common/rtsched.c - thrp_setlwpprio().
3642 // = ps -cL <pid> ... to validate priority.
3643 // = sched_get_priority_min and _max
3644 // pthread_create
3645 // sched_setparam
3646 // pthread_setschedparam
3647 //
3648 // Assumptions:
3649 // + We assume that all threads in the process belong to the same
3650 // scheduling class. IE. an homogenous process.
3651 // + Must be root or in IA group to change change "interactive" attribute.
3652 // Priocntl() will fail silently. The only indication of failure is when
3653 // we read-back the value and notice that it hasn't changed.
3654 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3655 // + For RT, change timeslice as well. Invariant:
3656 // constant "priority integral"
3657 // Konst == TimeSlice * (60-Priority)
3658 // Given a priority, compute appropriate timeslice.
3659 // + Higher numerical values have higher priority.
3660
3661 // sched class attributes
3662 typedef struct {
3663 int schedPolicy; // classID
3664 int maxPrio;
3665 int minPrio;
3666 } SchedInfo;
3667
3668
3669 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3670
3671 #ifdef ASSERT
3672 static int ReadBackValidate = 1;
3673 #endif
3674 static int myClass = 0;
3675 static int myMin = 0;
3676 static int myMax = 0;
3677 static int myCur = 0;
3678 static bool priocntl_enable = false;
3679
3680 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3681 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3682
3683
3684 // lwp_priocntl_init
3685 //
3686 // Try to determine the priority scale for our process.
3687 //
3688 // Return errno or 0 if OK.
3689 //
3690 static int lwp_priocntl_init () {
3691 int rslt;
3692 pcinfo_t ClassInfo;
3693 pcparms_t ParmInfo;
3694 int i;
3695
3696 if (!UseThreadPriorities) return 0;
3697
3698 // We are using Bound threads, we need to determine our priority ranges
3699 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3700 // If ThreadPriorityPolicy is 1, switch tables
3701 if (ThreadPriorityPolicy == 1) {
3702 for (i = 0 ; i < CriticalPriority+1; i++)
3703 os::java_to_os_priority[i] = prio_policy1[i];
3704 }
3705 if (UseCriticalJavaThreadPriority) {
3706 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3707 // See set_native_priority() and set_lwp_class_and_priority().
3708 // Save original MaxPriority mapping in case attempt to
3709 // use critical priority fails.
3710 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3711 // Set negative to distinguish from other priorities
3712 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3713 }
3714 }
3715 // Not using Bound Threads, set to ThreadPolicy 1
3716 else {
3717 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3718 os::java_to_os_priority[i] = prio_policy1[i];
3719 }
3720 return 0;
3721 }
3722
3723 // Get IDs for a set of well-known scheduling classes.
3724 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3725 // the system. We should have a loop that iterates over the
3726 // classID values, which are known to be "small" integers.
3727
3728 strcpy(ClassInfo.pc_clname, "TS");
3729 ClassInfo.pc_cid = -1;
3730 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3731 if (rslt < 0) return errno;
3732 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3733 tsLimits.schedPolicy = ClassInfo.pc_cid;
3734 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3735 tsLimits.minPrio = -tsLimits.maxPrio;
3736
3737 strcpy(ClassInfo.pc_clname, "IA");
3738 ClassInfo.pc_cid = -1;
3739 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3740 if (rslt < 0) return errno;
3741 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3742 iaLimits.schedPolicy = ClassInfo.pc_cid;
3743 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3744 iaLimits.minPrio = -iaLimits.maxPrio;
3745
3746 strcpy(ClassInfo.pc_clname, "RT");
3747 ClassInfo.pc_cid = -1;
3748 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3749 if (rslt < 0) return errno;
3750 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3751 rtLimits.schedPolicy = ClassInfo.pc_cid;
3752 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3753 rtLimits.minPrio = 0;
3754
3755 strcpy(ClassInfo.pc_clname, "FX");
3756 ClassInfo.pc_cid = -1;
3757 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3758 if (rslt < 0) return errno;
3759 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3760 fxLimits.schedPolicy = ClassInfo.pc_cid;
3761 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3762 fxLimits.minPrio = 0;
3763
3764 // Query our "current" scheduling class.
3765 // This will normally be IA, TS or, rarely, FX or RT.
3766 memset(&ParmInfo, 0, sizeof(ParmInfo));
3767 ParmInfo.pc_cid = PC_CLNULL;
3768 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3769 if (rslt < 0) return errno;
3770 myClass = ParmInfo.pc_cid;
3771
3772 // We now know our scheduling classId, get specific information
3773 // about the class.
3774 ClassInfo.pc_cid = myClass;
3775 ClassInfo.pc_clname[0] = 0;
3776 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3777 if (rslt < 0) return errno;
3778
3779 if (ThreadPriorityVerbose) {
3780 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3781 }
3782
3783 memset(&ParmInfo, 0, sizeof(pcparms_t));
3784 ParmInfo.pc_cid = PC_CLNULL;
3785 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3786 if (rslt < 0) return errno;
3787
3788 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3789 myMin = rtLimits.minPrio;
3790 myMax = rtLimits.maxPrio;
3791 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3792 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3793 myMin = iaLimits.minPrio;
3794 myMax = iaLimits.maxPrio;
3795 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3796 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3797 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3798 myMin = tsLimits.minPrio;
3799 myMax = tsLimits.maxPrio;
3800 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3801 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3802 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3803 myMin = fxLimits.minPrio;
3804 myMax = fxLimits.maxPrio;
3805 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3806 } else {
3807 // No clue - punt
3808 if (ThreadPriorityVerbose)
3809 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3810 return EINVAL; // no clue, punt
3811 }
3812
3813 if (ThreadPriorityVerbose) {
3814 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3815 }
3816
3817 priocntl_enable = true; // Enable changing priorities
3818 return 0;
3819 }
3820
3821 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3822 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3823 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3824 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3825
3826
3827 // scale_to_lwp_priority
3828 //
3829 // Convert from the libthread "thr_setprio" scale to our current
3830 // lwp scheduling class scale.
3831 //
3832 static
3833 int scale_to_lwp_priority (int rMin, int rMax, int x)
3834 {
3835 int v;
3836
3837 if (x == 127) return rMax; // avoid round-down
3838 v = (((x*(rMax-rMin)))/128)+rMin;
3839 return v;
3840 }
3841
3842
3843 // set_lwp_class_and_priority
3844 //
3845 // Set the class and priority of the lwp. This call should only
3846 // be made when using bound threads (T2 threads are bound by default).
3847 //
3848 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3849 int newPrio, int new_class, bool scale) {
3850 int rslt;
3851 int Actual, Expected, prv;
3852 pcparms_t ParmInfo; // for GET-SET
3853 #ifdef ASSERT
3854 pcparms_t ReadBack; // for readback
3855 #endif
3856
3857 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3858 // Query current values.
3859 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3860 // Cache "pcparms_t" in global ParmCache.
3861 // TODO: elide set-to-same-value
3862
3863 // If something went wrong on init, don't change priorities.
3864 if ( !priocntl_enable ) {
3865 if (ThreadPriorityVerbose)
3866 tty->print_cr("Trying to set priority but init failed, ignoring");
3867 return EINVAL;
3868 }
3869
3870 // If lwp hasn't started yet, just return
3871 // the _start routine will call us again.
3872 if ( lwpid <= 0 ) {
3873 if (ThreadPriorityVerbose) {
3874 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3875 INTPTR_FORMAT " to %d, lwpid not set",
3876 ThreadID, newPrio);
3877 }
3878 return 0;
3879 }
3880
3881 if (ThreadPriorityVerbose) {
3882 tty->print_cr ("set_lwp_class_and_priority("
3883 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3884 ThreadID, lwpid, newPrio);
3885 }
3886
3887 memset(&ParmInfo, 0, sizeof(pcparms_t));
3888 ParmInfo.pc_cid = PC_CLNULL;
3889 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3890 if (rslt < 0) return errno;
3891
3892 int cur_class = ParmInfo.pc_cid;
3893 ParmInfo.pc_cid = (id_t)new_class;
3894
3895 if (new_class == rtLimits.schedPolicy) {
3896 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3897 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3898 rtLimits.maxPrio, newPrio)
3899 : newPrio;
3900 rtInfo->rt_tqsecs = RT_NOCHANGE;
3901 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3902 if (ThreadPriorityVerbose) {
3903 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3904 }
3905 } else if (new_class == iaLimits.schedPolicy) {
3906 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3907 int maxClamped = MIN2(iaLimits.maxPrio,
3908 cur_class == new_class
3909 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3910 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3911 maxClamped, newPrio)
3912 : newPrio;
3913 iaInfo->ia_uprilim = cur_class == new_class
3914 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3915 iaInfo->ia_mode = IA_NOCHANGE;
3916 if (ThreadPriorityVerbose) {
3917 tty->print_cr("IA: [%d...%d] %d->%d\n",
3918 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3919 }
3920 } else if (new_class == tsLimits.schedPolicy) {
3921 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3922 int maxClamped = MIN2(tsLimits.maxPrio,
3923 cur_class == new_class
3924 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3925 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3926 maxClamped, newPrio)
3927 : newPrio;
3928 tsInfo->ts_uprilim = cur_class == new_class
3929 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3930 if (ThreadPriorityVerbose) {
3931 tty->print_cr("TS: [%d...%d] %d->%d\n",
3932 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3933 }
3934 } else if (new_class == fxLimits.schedPolicy) {
3935 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3936 int maxClamped = MIN2(fxLimits.maxPrio,
3937 cur_class == new_class
3938 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3939 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3940 maxClamped, newPrio)
3941 : newPrio;
3942 fxInfo->fx_uprilim = cur_class == new_class
3943 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3944 fxInfo->fx_tqsecs = FX_NOCHANGE;
3945 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3946 if (ThreadPriorityVerbose) {
3947 tty->print_cr("FX: [%d...%d] %d->%d\n",
3948 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3949 }
3950 } else {
3951 if (ThreadPriorityVerbose) {
3952 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3953 }
3954 return EINVAL; // no clue, punt
3955 }
3956
3957 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3958 if (ThreadPriorityVerbose && rslt) {
3959 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3960 }
3961 if (rslt < 0) return errno;
3962
3963 #ifdef ASSERT
3964 // Sanity check: read back what we just attempted to set.
3965 // In theory it could have changed in the interim ...
3966 //
3967 // The priocntl system call is tricky.
3968 // Sometimes it'll validate the priority value argument and
3969 // return EINVAL if unhappy. At other times it fails silently.
3970 // Readbacks are prudent.
3971
3972 if (!ReadBackValidate) return 0;
3973
3974 memset(&ReadBack, 0, sizeof(pcparms_t));
3975 ReadBack.pc_cid = PC_CLNULL;
3976 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3977 assert(rslt >= 0, "priocntl failed");
3978 Actual = Expected = 0xBAD;
3979 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3980 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3981 Actual = RTPRI(ReadBack)->rt_pri;
3982 Expected = RTPRI(ParmInfo)->rt_pri;
3983 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3984 Actual = IAPRI(ReadBack)->ia_upri;
3985 Expected = IAPRI(ParmInfo)->ia_upri;
3986 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3987 Actual = TSPRI(ReadBack)->ts_upri;
3988 Expected = TSPRI(ParmInfo)->ts_upri;
3989 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3990 Actual = FXPRI(ReadBack)->fx_upri;
3991 Expected = FXPRI(ParmInfo)->fx_upri;
3992 } else {
3993 if (ThreadPriorityVerbose) {
3994 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3995 ParmInfo.pc_cid);
3996 }
3997 }
3998
3999 if (Actual != Expected) {
4000 if (ThreadPriorityVerbose) {
4001 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
4002 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
4003 }
4004 }
4005 #endif
4006
4007 return 0;
4008 }
4009
4010 // Solaris only gives access to 128 real priorities at a time,
4011 // so we expand Java's ten to fill this range. This would be better
4012 // if we dynamically adjusted relative priorities.
4013 //
4014 // The ThreadPriorityPolicy option allows us to select 2 different
4015 // priority scales.
4016 //
4017 // ThreadPriorityPolicy=0
4018 // Since the Solaris' default priority is MaximumPriority, we do not
4019 // set a priority lower than Max unless a priority lower than
4020 // NormPriority is requested.
4021 //
4022 // ThreadPriorityPolicy=1
4023 // This mode causes the priority table to get filled with
4024 // linear values. NormPriority get's mapped to 50% of the
4025 // Maximum priority an so on. This will cause VM threads
4026 // to get unfair treatment against other Solaris processes
4027 // which do not explicitly alter their thread priorities.
4028 //
4029
4030 int os::java_to_os_priority[CriticalPriority + 1] = {
4031 -99999, // 0 Entry should never be used
4032
4033 0, // 1 MinPriority
4034 32, // 2
4035 64, // 3
4036
4037 96, // 4
4038 127, // 5 NormPriority
4039 127, // 6
4040
4041 127, // 7
4042 127, // 8
4043 127, // 9 NearMaxPriority
4044
4045 127, // 10 MaxPriority
4046
4047 -criticalPrio // 11 CriticalPriority
4048 };
4049
4050 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4051 OSThread* osthread = thread->osthread();
4052
4053 // Save requested priority in case the thread hasn't been started
4054 osthread->set_native_priority(newpri);
4055
4056 // Check for critical priority request
4057 bool fxcritical = false;
4058 if (newpri == -criticalPrio) {
4059 fxcritical = true;
4060 newpri = criticalPrio;
4061 }
4062
4063 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4064 if (!UseThreadPriorities) return OS_OK;
4065
4066 int status = 0;
4067
4068 if (!fxcritical) {
4069 // Use thr_setprio only if we have a priority that thr_setprio understands
4070 status = thr_setprio(thread->osthread()->thread_id(), newpri);
4071 }
4072
4073 if (os::Solaris::T2_libthread() ||
4074 (UseBoundThreads && osthread->is_vm_created())) {
4075 int lwp_status =
4076 set_lwp_class_and_priority(osthread->thread_id(),
4077 osthread->lwp_id(),
4078 newpri,
4079 fxcritical ? fxLimits.schedPolicy : myClass,
4080 !fxcritical);
4081 if (lwp_status != 0 && fxcritical) {
4082 // Try again, this time without changing the scheduling class
4083 newpri = java_MaxPriority_to_os_priority;
4084 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
4085 osthread->lwp_id(),
4086 newpri, myClass, false);
4087 }
4088 status |= lwp_status;
4089 }
4090 return (status == 0) ? OS_OK : OS_ERR;
4091 }
4092
4093
4094 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4095 int p;
4096 if ( !UseThreadPriorities ) {
4097 *priority_ptr = NormalPriority;
4098 return OS_OK;
4099 }
4100 int status = thr_getprio(thread->osthread()->thread_id(), &p);
4101 if (status != 0) {
4102 return OS_ERR;
4103 }
4104 *priority_ptr = p;
4105 return OS_OK;
4106 }
4107
4108
4109 // Hint to the underlying OS that a task switch would not be good.
4110 // Void return because it's a hint and can fail.
4111 void os::hint_no_preempt() {
4112 schedctl_start(schedctl_init());
4113 }
4114
4115 static void resume_clear_context(OSThread *osthread) {
4116 osthread->set_ucontext(NULL);
4117 }
4118
4119 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
4120 osthread->set_ucontext(context);
4121 }
4122
4123 static Semaphore sr_semaphore;
4124
4125 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
4126 // Save and restore errno to avoid confusing native code with EINTR
4127 // after sigsuspend.
4128 int old_errno = errno;
4129
4130 OSThread* osthread = thread->osthread();
4131 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
4132
4133 os::SuspendResume::State current = osthread->sr.state();
4134 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
4135 suspend_save_context(osthread, uc);
4136
4137 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
4138 os::SuspendResume::State state = osthread->sr.suspended();
4139 if (state == os::SuspendResume::SR_SUSPENDED) {
4140 sigset_t suspend_set; // signals for sigsuspend()
4141
4142 // get current set of blocked signals and unblock resume signal
4143 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
4144 sigdelset(&suspend_set, os::Solaris::SIGasync());
4145
4146 sr_semaphore.signal();
4147 // wait here until we are resumed
4148 while (1) {
4149 sigsuspend(&suspend_set);
4150
4151 os::SuspendResume::State result = osthread->sr.running();
4152 if (result == os::SuspendResume::SR_RUNNING) {
4153 sr_semaphore.signal();
4154 break;
4155 }
4156 }
4157
4158 } else if (state == os::SuspendResume::SR_RUNNING) {
4159 // request was cancelled, continue
4160 } else {
4161 ShouldNotReachHere();
4162 }
4163
4164 resume_clear_context(osthread);
4165 } else if (current == os::SuspendResume::SR_RUNNING) {
4166 // request was cancelled, continue
4167 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
4168 // ignore
4169 } else {
4170 // ignore
4171 }
4172
4173 errno = old_errno;
4174 }
4175
4176
4177 void os::interrupt(Thread* thread) {
4178 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4179
4180 OSThread* osthread = thread->osthread();
4181
4182 int isInterrupted = osthread->interrupted();
4183 if (!isInterrupted) {
4184 osthread->set_interrupted(true);
4185 OrderAccess::fence();
4186 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4187 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4188 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4189 ParkEvent * const slp = thread->_SleepEvent ;
4190 if (slp != NULL) slp->unpark() ;
4191 }
4192
4193 // For JSR166: unpark after setting status but before thr_kill -dl
4194 if (thread->is_Java_thread()) {
4195 ((JavaThread*)thread)->parker()->unpark();
4196 }
4197
4198 // Handle interruptible wait() ...
4199 ParkEvent * const ev = thread->_ParkEvent ;
4200 if (ev != NULL) ev->unpark() ;
4201
4202 // When events are used everywhere for os::sleep, then this thr_kill
4203 // will only be needed if UseVMInterruptibleIO is true.
4204
4205 if (!isInterrupted) {
4206 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4207 assert_status(status == 0, status, "thr_kill");
4208
4209 // Bump thread interruption counter
4210 RuntimeService::record_thread_interrupt_signaled_count();
4211 }
4212 }
4213
4214
4215 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4216 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4217
4218 OSThread* osthread = thread->osthread();
4219
4220 bool res = osthread->interrupted();
4221
4222 // NOTE that since there is no "lock" around these two operations,
4223 // there is the possibility that the interrupted flag will be
4224 // "false" but that the interrupt event will be set. This is
4225 // intentional. The effect of this is that Object.wait() will appear
4226 // to have a spurious wakeup, which is not harmful, and the
4227 // possibility is so rare that it is not worth the added complexity
4228 // to add yet another lock. It has also been recommended not to put
4229 // the interrupted flag into the os::Solaris::Event structure,
4230 // because it hides the issue.
4231 if (res && clear_interrupted) {
4232 osthread->set_interrupted(false);
4233 }
4234 return res;
4235 }
4236
4237
4238 void os::print_statistics() {
4239 }
4240
4241 int os::message_box(const char* title, const char* message) {
4242 int i;
4243 fdStream err(defaultStream::error_fd());
4244 for (i = 0; i < 78; i++) err.print_raw("=");
4245 err.cr();
4246 err.print_raw_cr(title);
4247 for (i = 0; i < 78; i++) err.print_raw("-");
4248 err.cr();
4249 err.print_raw_cr(message);
4250 for (i = 0; i < 78; i++) err.print_raw("=");
4251 err.cr();
4252
4253 char buf[16];
4254 // Prevent process from exiting upon "read error" without consuming all CPU
4255 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4256
4257 return buf[0] == 'y' || buf[0] == 'Y';
4258 }
4259
4260 static int sr_notify(OSThread* osthread) {
4261 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4262 assert_status(status == 0, status, "thr_kill");
4263 return status;
4264 }
4265
4266 // "Randomly" selected value for how long we want to spin
4267 // before bailing out on suspending a thread, also how often
4268 // we send a signal to a thread we want to resume
4269 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4270 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4271
4272 static bool do_suspend(OSThread* osthread) {
4273 assert(osthread->sr.is_running(), "thread should be running");
4274 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4275
4276 // mark as suspended and send signal
4277 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4278 // failed to switch, state wasn't running?
4279 ShouldNotReachHere();
4280 return false;
4281 }
4282
4283 if (sr_notify(osthread) != 0) {
4284 ShouldNotReachHere();
4285 }
4286
4287 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4288 while (true) {
4289 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4290 break;
4291 } else {
4292 // timeout
4293 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4294 if (cancelled == os::SuspendResume::SR_RUNNING) {
4295 return false;
4296 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4297 // make sure that we consume the signal on the semaphore as well
4298 sr_semaphore.wait();
4299 break;
4300 } else {
4301 ShouldNotReachHere();
4302 return false;
4303 }
4304 }
4305 }
4306
4307 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4308 return true;
4309 }
4310
4311 static void do_resume(OSThread* osthread) {
4312 assert(osthread->sr.is_suspended(), "thread should be suspended");
4313 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4314
4315 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4316 // failed to switch to WAKEUP_REQUEST
4317 ShouldNotReachHere();
4318 return;
4319 }
4320
4321 while (true) {
4322 if (sr_notify(osthread) == 0) {
4323 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4324 if (osthread->sr.is_running()) {
4325 return;
4326 }
4327 }
4328 } else {
4329 ShouldNotReachHere();
4330 }
4331 }
4332
4333 guarantee(osthread->sr.is_running(), "Must be running!");
4334 }
4335
4336 void os::SuspendedThreadTask::internal_do_task() {
4337 if (do_suspend(_thread->osthread())) {
4338 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4339 do_task(context);
4340 do_resume(_thread->osthread());
4341 }
4342 }
4343
4344 class PcFetcher : public os::SuspendedThreadTask {
4345 public:
4346 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4347 ExtendedPC result();
4348 protected:
4349 void do_task(const os::SuspendedThreadTaskContext& context);
4350 private:
4351 ExtendedPC _epc;
4352 };
4353
4354 ExtendedPC PcFetcher::result() {
4355 guarantee(is_done(), "task is not done yet.");
4356 return _epc;
4357 }
4358
4359 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4360 Thread* thread = context.thread();
4361 OSThread* osthread = thread->osthread();
4362 if (osthread->ucontext() != NULL) {
4363 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4364 } else {
4365 // NULL context is unexpected, double-check this is the VMThread
4366 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4367 }
4368 }
4369
4370 // A lightweight implementation that does not suspend the target thread and
4371 // thus returns only a hint. Used for profiling only!
4372 ExtendedPC os::get_thread_pc(Thread* thread) {
4373 // Make sure that it is called by the watcher and the Threads lock is owned.
4374 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4375 // For now, is only used to profile the VM Thread
4376 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4377 PcFetcher fetcher(thread);
4378 fetcher.run();
4379 return fetcher.result();
4380 }
4381
4382
4383 // This does not do anything on Solaris. This is basically a hook for being
4384 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4385 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4386 f(value, method, args, thread);
4387 }
4388
4389 // This routine may be used by user applications as a "hook" to catch signals.
4390 // The user-defined signal handler must pass unrecognized signals to this
4391 // routine, and if it returns true (non-zero), then the signal handler must
4392 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4393 // routine will never retun false (zero), but instead will execute a VM panic
4394 // routine kill the process.
4395 //
4396 // If this routine returns false, it is OK to call it again. This allows
4397 // the user-defined signal handler to perform checks either before or after
4398 // the VM performs its own checks. Naturally, the user code would be making
4399 // a serious error if it tried to handle an exception (such as a null check
4400 // or breakpoint) that the VM was generating for its own correct operation.
4401 //
4402 // This routine may recognize any of the following kinds of signals:
4403 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4404 // os::Solaris::SIGasync
4405 // It should be consulted by handlers for any of those signals.
4406 // It explicitly does not recognize os::Solaris::SIGinterrupt
4407 //
4408 // The caller of this routine must pass in the three arguments supplied
4409 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4410 // field of the structure passed to sigaction(). This routine assumes that
4411 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4412 //
4413 // Note that the VM will print warnings if it detects conflicting signal
4414 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4415 //
4416 extern "C" JNIEXPORT int
4417 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4418 int abort_if_unrecognized);
4419
4420
4421 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4422 int orig_errno = errno; // Preserve errno value over signal handler.
4423 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4424 errno = orig_errno;
4425 }
4426
4427 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4428 is needed to provoke threads blocked on IO to return an EINTR
4429 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4430 does NOT participate in signal chaining due to requirement for
4431 NOT setting SA_RESTART to make EINTR work. */
4432 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4433 if (UseSignalChaining) {
4434 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4435 if (actp && actp->sa_handler) {
4436 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4437 }
4438 }
4439 }
4440
4441 // This boolean allows users to forward their own non-matching signals
4442 // to JVM_handle_solaris_signal, harmlessly.
4443 bool os::Solaris::signal_handlers_are_installed = false;
4444
4445 // For signal-chaining
4446 bool os::Solaris::libjsig_is_loaded = false;
4447 typedef struct sigaction *(*get_signal_t)(int);
4448 get_signal_t os::Solaris::get_signal_action = NULL;
4449
4450 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4451 struct sigaction *actp = NULL;
4452
4453 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4454 // Retrieve the old signal handler from libjsig
4455 actp = (*get_signal_action)(sig);
4456 }
4457 if (actp == NULL) {
4458 // Retrieve the preinstalled signal handler from jvm
4459 actp = get_preinstalled_handler(sig);
4460 }
4461
4462 return actp;
4463 }
4464
4465 static bool call_chained_handler(struct sigaction *actp, int sig,
4466 siginfo_t *siginfo, void *context) {
4467 // Call the old signal handler
4468 if (actp->sa_handler == SIG_DFL) {
4469 // It's more reasonable to let jvm treat it as an unexpected exception
4470 // instead of taking the default action.
4471 return false;
4472 } else if (actp->sa_handler != SIG_IGN) {
4473 if ((actp->sa_flags & SA_NODEFER) == 0) {
4474 // automaticlly block the signal
4475 sigaddset(&(actp->sa_mask), sig);
4476 }
4477
4478 sa_handler_t hand;
4479 sa_sigaction_t sa;
4480 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4481 // retrieve the chained handler
4482 if (siginfo_flag_set) {
4483 sa = actp->sa_sigaction;
4484 } else {
4485 hand = actp->sa_handler;
4486 }
4487
4488 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4489 actp->sa_handler = SIG_DFL;
4490 }
4491
4492 // try to honor the signal mask
4493 sigset_t oset;
4494 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4495
4496 // call into the chained handler
4497 if (siginfo_flag_set) {
4498 (*sa)(sig, siginfo, context);
4499 } else {
4500 (*hand)(sig);
4501 }
4502
4503 // restore the signal mask
4504 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4505 }
4506 // Tell jvm's signal handler the signal is taken care of.
4507 return true;
4508 }
4509
4510 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4511 bool chained = false;
4512 // signal-chaining
4513 if (UseSignalChaining) {
4514 struct sigaction *actp = get_chained_signal_action(sig);
4515 if (actp != NULL) {
4516 chained = call_chained_handler(actp, sig, siginfo, context);
4517 }
4518 }
4519 return chained;
4520 }
4521
4522 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4523 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4524 if (preinstalled_sigs[sig] != 0) {
4525 return &chainedsigactions[sig];
4526 }
4527 return NULL;
4528 }
4529
4530 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4531
4532 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4533 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4534 chainedsigactions[sig] = oldAct;
4535 preinstalled_sigs[sig] = 1;
4536 }
4537
4538 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4539 // Check for overwrite.
4540 struct sigaction oldAct;
4541 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4542 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4543 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4544 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4545 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4546 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4547 if (AllowUserSignalHandlers || !set_installed) {
4548 // Do not overwrite; user takes responsibility to forward to us.
4549 return;
4550 } else if (UseSignalChaining) {
4551 if (oktochain) {
4552 // save the old handler in jvm
4553 save_preinstalled_handler(sig, oldAct);
4554 } else {
4555 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4556 }
4557 // libjsig also interposes the sigaction() call below and saves the
4558 // old sigaction on it own.
4559 } else {
4560 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4561 "%#lx for signal %d.", (long)oldhand, sig));
4562 }
4563 }
4564
4565 struct sigaction sigAct;
4566 sigfillset(&(sigAct.sa_mask));
4567 sigAct.sa_handler = SIG_DFL;
4568
4569 sigAct.sa_sigaction = signalHandler;
4570 // Handle SIGSEGV on alternate signal stack if
4571 // not using stack banging
4572 if (!UseStackBanging && sig == SIGSEGV) {
4573 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4574 // Interruptible i/o requires SA_RESTART cleared so EINTR
4575 // is returned instead of restarting system calls
4576 } else if (sig == os::Solaris::SIGinterrupt()) {
4577 sigemptyset(&sigAct.sa_mask);
4578 sigAct.sa_handler = NULL;
4579 sigAct.sa_flags = SA_SIGINFO;
4580 sigAct.sa_sigaction = sigINTRHandler;
4581 } else {
4582 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4583 }
4584 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4585
4586 sigaction(sig, &sigAct, &oldAct);
4587
4588 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4589 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4590 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4591 }
4592
4593
4594 #define DO_SIGNAL_CHECK(sig) \
4595 if (!sigismember(&check_signal_done, sig)) \
4596 os::Solaris::check_signal_handler(sig)
4597
4598 // This method is a periodic task to check for misbehaving JNI applications
4599 // under CheckJNI, we can add any periodic checks here
4600
4601 void os::run_periodic_checks() {
4602 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4603 // thereby preventing a NULL checks.
4604 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4605
4606 if (check_signals == false) return;
4607
4608 // SEGV and BUS if overridden could potentially prevent
4609 // generation of hs*.log in the event of a crash, debugging
4610 // such a case can be very challenging, so we absolutely
4611 // check for the following for a good measure:
4612 DO_SIGNAL_CHECK(SIGSEGV);
4613 DO_SIGNAL_CHECK(SIGILL);
4614 DO_SIGNAL_CHECK(SIGFPE);
4615 DO_SIGNAL_CHECK(SIGBUS);
4616 DO_SIGNAL_CHECK(SIGPIPE);
4617 DO_SIGNAL_CHECK(SIGXFSZ);
4618
4619 // ReduceSignalUsage allows the user to override these handlers
4620 // see comments at the very top and jvm_solaris.h
4621 if (!ReduceSignalUsage) {
4622 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4623 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4624 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4625 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4626 }
4627
4628 // See comments above for using JVM1/JVM2 and UseAltSigs
4629 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4630 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4631
4632 }
4633
4634 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4635
4636 static os_sigaction_t os_sigaction = NULL;
4637
4638 void os::Solaris::check_signal_handler(int sig) {
4639 char buf[O_BUFLEN];
4640 address jvmHandler = NULL;
4641
4642 struct sigaction act;
4643 if (os_sigaction == NULL) {
4644 // only trust the default sigaction, in case it has been interposed
4645 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4646 if (os_sigaction == NULL) return;
4647 }
4648
4649 os_sigaction(sig, (struct sigaction*)NULL, &act);
4650
4651 address thisHandler = (act.sa_flags & SA_SIGINFO)
4652 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4653 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4654
4655
4656 switch(sig) {
4657 case SIGSEGV:
4658 case SIGBUS:
4659 case SIGFPE:
4660 case SIGPIPE:
4661 case SIGXFSZ:
4662 case SIGILL:
4663 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4664 break;
4665
4666 case SHUTDOWN1_SIGNAL:
4667 case SHUTDOWN2_SIGNAL:
4668 case SHUTDOWN3_SIGNAL:
4669 case BREAK_SIGNAL:
4670 jvmHandler = (address)user_handler();
4671 break;
4672
4673 default:
4674 int intrsig = os::Solaris::SIGinterrupt();
4675 int asynsig = os::Solaris::SIGasync();
4676
4677 if (sig == intrsig) {
4678 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4679 } else if (sig == asynsig) {
4680 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4681 } else {
4682 return;
4683 }
4684 break;
4685 }
4686
4687
4688 if (thisHandler != jvmHandler) {
4689 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4690 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4691 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4692 // No need to check this sig any longer
4693 sigaddset(&check_signal_done, sig);
4694 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4695 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4696 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4697 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4698 // No need to check this sig any longer
4699 sigaddset(&check_signal_done, sig);
4700 }
4701
4702 // Print all the signal handler state
4703 if (sigismember(&check_signal_done, sig)) {
4704 print_signal_handlers(tty, buf, O_BUFLEN);
4705 }
4706
4707 }
4708
4709 void os::Solaris::install_signal_handlers() {
4710 bool libjsigdone = false;
4711 signal_handlers_are_installed = true;
4712
4713 // signal-chaining
4714 typedef void (*signal_setting_t)();
4715 signal_setting_t begin_signal_setting = NULL;
4716 signal_setting_t end_signal_setting = NULL;
4717 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4718 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4719 if (begin_signal_setting != NULL) {
4720 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4721 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4722 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4723 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4724 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4725 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4726 libjsig_is_loaded = true;
4727 if (os::Solaris::get_libjsig_version != NULL) {
4728 libjsigversion = (*os::Solaris::get_libjsig_version)();
4729 }
4730 assert(UseSignalChaining, "should enable signal-chaining");
4731 }
4732 if (libjsig_is_loaded) {
4733 // Tell libjsig jvm is setting signal handlers
4734 (*begin_signal_setting)();
4735 }
4736
4737 set_signal_handler(SIGSEGV, true, true);
4738 set_signal_handler(SIGPIPE, true, true);
4739 set_signal_handler(SIGXFSZ, true, true);
4740 set_signal_handler(SIGBUS, true, true);
4741 set_signal_handler(SIGILL, true, true);
4742 set_signal_handler(SIGFPE, true, true);
4743
4744
4745 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4746
4747 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4748 // can not register overridable signals which might be > 32
4749 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4750 // Tell libjsig jvm has finished setting signal handlers
4751 (*end_signal_setting)();
4752 libjsigdone = true;
4753 }
4754 }
4755
4756 // Never ok to chain our SIGinterrupt
4757 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4758 set_signal_handler(os::Solaris::SIGasync(), true, true);
4759
4760 if (libjsig_is_loaded && !libjsigdone) {
4761 // Tell libjsig jvm finishes setting signal handlers
4762 (*end_signal_setting)();
4763 }
4764
4765 // We don't activate signal checker if libjsig is in place, we trust ourselves
4766 // and if UserSignalHandler is installed all bets are off.
4767 // Log that signal checking is off only if -verbose:jni is specified.
4768 if (CheckJNICalls) {
4769 if (libjsig_is_loaded) {
4770 if (PrintJNIResolving) {
4771 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4772 }
4773 check_signals = false;
4774 }
4775 if (AllowUserSignalHandlers) {
4776 if (PrintJNIResolving) {
4777 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4778 }
4779 check_signals = false;
4780 }
4781 }
4782 }
4783
4784
4785 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4786
4787 const char * signames[] = {
4788 "SIG0",
4789 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4790 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4791 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4792 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4793 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4794 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4795 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4796 "SIGCANCEL", "SIGLOST"
4797 };
4798
4799 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4800 if (0 < exception_code && exception_code <= SIGRTMAX) {
4801 // signal
4802 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4803 jio_snprintf(buf, size, "%s", signames[exception_code]);
4804 } else {
4805 jio_snprintf(buf, size, "SIG%d", exception_code);
4806 }
4807 return buf;
4808 } else {
4809 return NULL;
4810 }
4811 }
4812
4813 // (Static) wrappers for the new libthread API
4814 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4815 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4816 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4817 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4818 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4819
4820 // (Static) wrapper for getisax(2) call.
4821 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4822
4823 // (Static) wrappers for the liblgrp API
4824 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4825 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4826 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4827 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4828 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4829 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4830 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4831 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4832 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4833
4834 // (Static) wrapper for meminfo() call.
4835 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4836
4837 static address resolve_symbol_lazy(const char* name) {
4838 address addr = (address) dlsym(RTLD_DEFAULT, name);
4839 if(addr == NULL) {
4840 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4841 addr = (address) dlsym(RTLD_NEXT, name);
4842 }
4843 return addr;
4844 }
4845
4846 static address resolve_symbol(const char* name) {
4847 address addr = resolve_symbol_lazy(name);
4848 if(addr == NULL) {
4849 fatal(dlerror());
4850 }
4851 return addr;
4852 }
4853
4854
4855
4856 // isT2_libthread()
4857 //
4858 // Routine to determine if we are currently using the new T2 libthread.
4859 //
4860 // We determine if we are using T2 by reading /proc/self/lstatus and
4861 // looking for a thread with the ASLWP bit set. If we find this status
4862 // bit set, we must assume that we are NOT using T2. The T2 team
4863 // has approved this algorithm.
4864 //
4865 // We need to determine if we are running with the new T2 libthread
4866 // since setting native thread priorities is handled differently
4867 // when using this library. All threads created using T2 are bound
4868 // threads. Calling thr_setprio is meaningless in this case.
4869 //
4870 bool isT2_libthread() {
4871 static prheader_t * lwpArray = NULL;
4872 static int lwpSize = 0;
4873 static int lwpFile = -1;
4874 lwpstatus_t * that;
4875 char lwpName [128];
4876 bool isT2 = false;
4877
4878 #define ADR(x) ((uintptr_t)(x))
4879 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4880
4881 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4882 if (lwpFile < 0) {
4883 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4884 return false;
4885 }
4886 lwpSize = 16*1024;
4887 for (;;) {
4888 ::lseek64 (lwpFile, 0, SEEK_SET);
4889 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4890 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4891 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4892 break;
4893 }
4894 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4895 // We got a good snapshot - now iterate over the list.
4896 int aslwpcount = 0;
4897 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4898 that = LWPINDEX(lwpArray,i);
4899 if (that->pr_flags & PR_ASLWP) {
4900 aslwpcount++;
4901 }
4902 }
4903 if (aslwpcount == 0) isT2 = true;
4904 break;
4905 }
4906 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4907 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4908 }
4909
4910 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4911 ::close (lwpFile);
4912 if (ThreadPriorityVerbose) {
4913 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4914 else tty->print_cr("We are not running with a T2 libthread\n");
4915 }
4916 return isT2;
4917 }
4918
4919
4920 void os::Solaris::libthread_init() {
4921 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4922
4923 // Determine if we are running with the new T2 libthread
4924 os::Solaris::set_T2_libthread(isT2_libthread());
4925
4926 lwp_priocntl_init();
4927
4928 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4929 if(func == NULL) {
4930 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4931 // Guarantee that this VM is running on an new enough OS (5.6 or
4932 // later) that it will have a new enough libthread.so.
4933 guarantee(func != NULL, "libthread.so is too old.");
4934 }
4935
4936 // Initialize the new libthread getstate API wrappers
4937 func = resolve_symbol("thr_getstate");
4938 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4939
4940 func = resolve_symbol("thr_setstate");
4941 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4942
4943 func = resolve_symbol("thr_setmutator");
4944 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4945
4946 func = resolve_symbol("thr_suspend_mutator");
4947 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4948
4949 func = resolve_symbol("thr_continue_mutator");
4950 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4951
4952 int size;
4953 void (*handler_info_func)(address *, int *);
4954 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4955 handler_info_func(&handler_start, &size);
4956 handler_end = handler_start + size;
4957 }
4958
4959
4960 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4961 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4962 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4963 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4964 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4965 int os::Solaris::_mutex_scope = USYNC_THREAD;
4966
4967 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4968 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4969 int_fnP_cond_tP os::Solaris::_cond_signal;
4970 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4971 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4972 int_fnP_cond_tP os::Solaris::_cond_destroy;
4973 int os::Solaris::_cond_scope = USYNC_THREAD;
4974
4975 void os::Solaris::synchronization_init() {
4976 if(UseLWPSynchronization) {
4977 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4978 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4979 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4980 os::Solaris::set_mutex_init(lwp_mutex_init);
4981 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4982 os::Solaris::set_mutex_scope(USYNC_THREAD);
4983
4984 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4985 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4986 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4987 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4988 os::Solaris::set_cond_init(lwp_cond_init);
4989 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4990 os::Solaris::set_cond_scope(USYNC_THREAD);
4991 }
4992 else {
4993 os::Solaris::set_mutex_scope(USYNC_THREAD);
4994 os::Solaris::set_cond_scope(USYNC_THREAD);
4995
4996 if(UsePthreads) {
4997 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4998 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4999 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
5000 os::Solaris::set_mutex_init(pthread_mutex_default_init);
5001 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
5002
5003 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
5004 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
5005 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
5006 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
5007 os::Solaris::set_cond_init(pthread_cond_default_init);
5008 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
5009 }
5010 else {
5011 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
5012 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
5013 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
5014 os::Solaris::set_mutex_init(::mutex_init);
5015 os::Solaris::set_mutex_destroy(::mutex_destroy);
5016
5017 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
5018 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
5019 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
5020 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
5021 os::Solaris::set_cond_init(::cond_init);
5022 os::Solaris::set_cond_destroy(::cond_destroy);
5023 }
5024 }
5025 }
5026
5027 bool os::Solaris::liblgrp_init() {
5028 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
5029 if (handle != NULL) {
5030 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
5031 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
5032 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
5033 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
5034 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
5035 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
5036 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
5037 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
5038 dlsym(handle, "lgrp_cookie_stale")));
5039
5040 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
5041 set_lgrp_cookie(c);
5042 return true;
5043 }
5044 return false;
5045 }
5046
5047 void os::Solaris::misc_sym_init() {
5048 address func;
5049
5050 // getisax
5051 func = resolve_symbol_lazy("getisax");
5052 if (func != NULL) {
5053 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
5054 }
5055
5056 // meminfo
5057 func = resolve_symbol_lazy("meminfo");
5058 if (func != NULL) {
5059 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
5060 }
5061 }
5062
5063 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
5064 assert(_getisax != NULL, "_getisax not set");
5065 return _getisax(array, n);
5066 }
5067
5068 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
5069 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
5070 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
5071
5072 void init_pset_getloadavg_ptr(void) {
5073 pset_getloadavg_ptr =
5074 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
5075 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
5076 warning("pset_getloadavg function not found");
5077 }
5078 }
5079
5080 int os::Solaris::_dev_zero_fd = -1;
5081
5082 // this is called _before_ the global arguments have been parsed
5083 void os::init(void) {
5084 _initial_pid = getpid();
5085
5086 max_hrtime = first_hrtime = gethrtime();
5087
5088 init_random(1234567);
5089
5090 page_size = sysconf(_SC_PAGESIZE);
5091 if (page_size == -1)
5092 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
5093 strerror(errno)));
5094 init_page_sizes((size_t) page_size);
5095
5096 Solaris::initialize_system_info();
5097
5098 // Initialize misc. symbols as soon as possible, so we can use them
5099 // if we need them.
5100 Solaris::misc_sym_init();
5101
5102 int fd = ::open("/dev/zero", O_RDWR);
5103 if (fd < 0) {
5104 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
5105 } else {
5106 Solaris::set_dev_zero_fd(fd);
5107
5108 // Close on exec, child won't inherit.
5109 fcntl(fd, F_SETFD, FD_CLOEXEC);
5110 }
5111
5112 clock_tics_per_sec = CLK_TCK;
5113
5114 // check if dladdr1() exists; dladdr1 can provide more information than
5115 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
5116 // and is available on linker patches for 5.7 and 5.8.
5117 // libdl.so must have been loaded, this call is just an entry lookup
5118 void * hdl = dlopen("libdl.so", RTLD_NOW);
5119 if (hdl)
5120 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
5121
5122 // (Solaris only) this switches to calls that actually do locking.
5123 ThreadCritical::initialize();
5124
5125 main_thread = thr_self();
5126
5127 // Constant minimum stack size allowed. It must be at least
5128 // the minimum of what the OS supports (thr_min_stack()), and
5129 // enough to allow the thread to get to user bytecode execution.
5130 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
5131 // If the pagesize of the VM is greater than 8K determine the appropriate
5132 // number of initial guard pages. The user can change this with the
5133 // command line arguments, if needed.
5134 if (vm_page_size() > 8*K) {
5135 StackYellowPages = 1;
5136 StackRedPages = 1;
5137 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
5138 }
5139 }
5140
5141 // To install functions for atexit system call
5142 extern "C" {
5143 static void perfMemory_exit_helper() {
5144 perfMemory_exit();
5145 }
5146 }
5147
5148 // this is called _after_ the global arguments have been parsed
5149 jint os::init_2(void) {
5150 // try to enable extended file IO ASAP, see 6431278
5151 os::Solaris::try_enable_extended_io();
5152
5153 // Allocate a single page and mark it as readable for safepoint polling. Also
5154 // use this first mmap call to check support for MAP_ALIGN.
5155 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
5156 page_size,
5157 MAP_PRIVATE | MAP_ALIGN,
5158 PROT_READ);
5159 if (polling_page == NULL) {
5160 has_map_align = false;
5161 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
5162 PROT_READ);
5163 }
5164
5165 os::set_polling_page(polling_page);
5166
5167 #ifndef PRODUCT
5168 if( Verbose && PrintMiscellaneous )
5169 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
5170 #endif
5171
5172 if (!UseMembar) {
5173 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
5174 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
5175 os::set_memory_serialize_page( mem_serialize_page );
5176
5177 #ifndef PRODUCT
5178 if(Verbose && PrintMiscellaneous)
5179 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
5180 #endif
5181 }
5182
5183 // Check minimum allowable stack size for thread creation and to initialize
5184 // the java system classes, including StackOverflowError - depends on page
5185 // size. Add a page for compiler2 recursion in main thread.
5186 // Add in 2*BytesPerWord times page size to account for VM stack during
5187 // class initialization depending on 32 or 64 bit VM.
5188 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5189 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5190 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5191
5192 size_t threadStackSizeInBytes = ThreadStackSize * K;
5193 if (threadStackSizeInBytes != 0 &&
5194 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5195 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5196 os::Solaris::min_stack_allowed/K);
5197 return JNI_ERR;
5198 }
5199
5200 // For 64kbps there will be a 64kb page size, which makes
5201 // the usable default stack size quite a bit less. Increase the
5202 // stack for 64kb (or any > than 8kb) pages, this increases
5203 // virtual memory fragmentation (since we're not creating the
5204 // stack on a power of 2 boundary. The real fix for this
5205 // should be to fix the guard page mechanism.
5206
5207 if (vm_page_size() > 8*K) {
5208 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5209 ? threadStackSizeInBytes +
5210 ((StackYellowPages + StackRedPages) * vm_page_size())
5211 : 0;
5212 ThreadStackSize = threadStackSizeInBytes/K;
5213 }
5214
5215 // Make the stack size a multiple of the page size so that
5216 // the yellow/red zones can be guarded.
5217 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5218 vm_page_size()));
5219
5220 Solaris::libthread_init();
5221
5222 if (UseNUMA) {
5223 if (!Solaris::liblgrp_init()) {
5224 UseNUMA = false;
5225 } else {
5226 size_t lgrp_limit = os::numa_get_groups_num();
5227 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5228 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5229 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5230 if (lgrp_num < 2) {
5231 // There's only one locality group, disable NUMA.
5232 UseNUMA = false;
5233 }
5234 }
5235 if (!UseNUMA && ForceNUMA) {
5236 UseNUMA = true;
5237 }
5238 }
5239
5240 Solaris::signal_sets_init();
5241 Solaris::init_signal_mem();
5242 Solaris::install_signal_handlers();
5243
5244 if (libjsigversion < JSIG_VERSION_1_4_1) {
5245 Maxlibjsigsigs = OLDMAXSIGNUM;
5246 }
5247
5248 // initialize synchronization primitives to use either thread or
5249 // lwp synchronization (controlled by UseLWPSynchronization)
5250 Solaris::synchronization_init();
5251
5252 if (MaxFDLimit) {
5253 // set the number of file descriptors to max. print out error
5254 // if getrlimit/setrlimit fails but continue regardless.
5255 struct rlimit nbr_files;
5256 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5257 if (status != 0) {
5258 if (PrintMiscellaneous && (Verbose || WizardMode))
5259 perror("os::init_2 getrlimit failed");
5260 } else {
5261 nbr_files.rlim_cur = nbr_files.rlim_max;
5262 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5263 if (status != 0) {
5264 if (PrintMiscellaneous && (Verbose || WizardMode))
5265 perror("os::init_2 setrlimit failed");
5266 }
5267 }
5268 }
5269
5270 // Calculate theoretical max. size of Threads to guard gainst
5271 // artifical out-of-memory situations, where all available address-
5272 // space has been reserved by thread stacks. Default stack size is 1Mb.
5273 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5274 JavaThread::stack_size_at_create() : (1*K*K);
5275 assert(pre_thread_stack_size != 0, "Must have a stack");
5276 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5277 // we should start doing Virtual Memory banging. Currently when the threads will
5278 // have used all but 200Mb of space.
5279 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5280 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5281
5282 // at-exit methods are called in the reverse order of their registration.
5283 // In Solaris 7 and earlier, atexit functions are called on return from
5284 // main or as a result of a call to exit(3C). There can be only 32 of
5285 // these functions registered and atexit() does not set errno. In Solaris
5286 // 8 and later, there is no limit to the number of functions registered
5287 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5288 // functions are called upon dlclose(3DL) in addition to return from main
5289 // and exit(3C).
5290
5291 if (PerfAllowAtExitRegistration) {
5292 // only register atexit functions if PerfAllowAtExitRegistration is set.
5293 // atexit functions can be delayed until process exit time, which
5294 // can be problematic for embedded VM situations. Embedded VMs should
5295 // call DestroyJavaVM() to assure that VM resources are released.
5296
5297 // note: perfMemory_exit_helper atexit function may be removed in
5298 // the future if the appropriate cleanup code can be added to the
5299 // VM_Exit VMOperation's doit method.
5300 if (atexit(perfMemory_exit_helper) != 0) {
5301 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5302 }
5303 }
5304
5305 // Init pset_loadavg function pointer
5306 init_pset_getloadavg_ptr();
5307
5308 return JNI_OK;
5309 }
5310
5311 void os::init_3(void) {
5312 return;
5313 }
5314
5315 // Mark the polling page as unreadable
5316 void os::make_polling_page_unreadable(void) {
5317 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5318 fatal("Could not disable polling page");
5319 };
5320
5321 // Mark the polling page as readable
5322 void os::make_polling_page_readable(void) {
5323 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5324 fatal("Could not enable polling page");
5325 };
5326
5327 // OS interface.
5328
5329 bool os::check_heap(bool force) { return true; }
5330
5331 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5332 static vsnprintf_t sol_vsnprintf = NULL;
5333
5334 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5335 if (!sol_vsnprintf) {
5336 //search for the named symbol in the objects that were loaded after libjvm
5337 void* where = RTLD_NEXT;
5338 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5339 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5340 if (!sol_vsnprintf){
5341 //search for the named symbol in the objects that were loaded before libjvm
5342 where = RTLD_DEFAULT;
5343 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5344 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5345 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5346 }
5347 }
5348 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5349 }
5350
5351
5352 // Is a (classpath) directory empty?
5353 bool os::dir_is_empty(const char* path) {
5354 DIR *dir = NULL;
5355 struct dirent *ptr;
5356
5357 dir = opendir(path);
5358 if (dir == NULL) return true;
5359
5360 /* Scan the directory */
5361 bool result = true;
5362 char buf[sizeof(struct dirent) + MAX_PATH];
5363 struct dirent *dbuf = (struct dirent *) buf;
5364 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5365 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5366 result = false;
5367 }
5368 }
5369 closedir(dir);
5370 return result;
5371 }
5372
5373 // This code originates from JDK's sysOpen and open64_w
5374 // from src/solaris/hpi/src/system_md.c
5375
5376 #ifndef O_DELETE
5377 #define O_DELETE 0x10000
5378 #endif
5379
5380 // Open a file. Unlink the file immediately after open returns
5381 // if the specified oflag has the O_DELETE flag set.
5382 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5383
5384 int os::open(const char *path, int oflag, int mode) {
5385 if (strlen(path) > MAX_PATH - 1) {
5386 errno = ENAMETOOLONG;
5387 return -1;
5388 }
5389 int fd;
5390 int o_delete = (oflag & O_DELETE);
5391 oflag = oflag & ~O_DELETE;
5392
5393 fd = ::open64(path, oflag, mode);
5394 if (fd == -1) return -1;
5395
5396 //If the open succeeded, the file might still be a directory
5397 {
5398 struct stat64 buf64;
5399 int ret = ::fstat64(fd, &buf64);
5400 int st_mode = buf64.st_mode;
5401
5402 if (ret != -1) {
5403 if ((st_mode & S_IFMT) == S_IFDIR) {
5404 errno = EISDIR;
5405 ::close(fd);
5406 return -1;
5407 }
5408 } else {
5409 ::close(fd);
5410 return -1;
5411 }
5412 }
5413 /*
5414 * 32-bit Solaris systems suffer from:
5415 *
5416 * - an historical default soft limit of 256 per-process file
5417 * descriptors that is too low for many Java programs.
5418 *
5419 * - a design flaw where file descriptors created using stdio
5420 * fopen must be less than 256, _even_ when the first limit above
5421 * has been raised. This can cause calls to fopen (but not calls to
5422 * open, for example) to fail mysteriously, perhaps in 3rd party
5423 * native code (although the JDK itself uses fopen). One can hardly
5424 * criticize them for using this most standard of all functions.
5425 *
5426 * We attempt to make everything work anyways by:
5427 *
5428 * - raising the soft limit on per-process file descriptors beyond
5429 * 256
5430 *
5431 * - As of Solaris 10u4, we can request that Solaris raise the 256
5432 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5433 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5434 *
5435 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5436 * workaround the bug by remapping non-stdio file descriptors below
5437 * 256 to ones beyond 256, which is done below.
5438 *
5439 * See:
5440 * 1085341: 32-bit stdio routines should support file descriptors >255
5441 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5442 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5443 * enable_extended_FILE_stdio() in VM initialisation
5444 * Giri Mandalika's blog
5445 * http://technopark02.blogspot.com/2005_05_01_archive.html
5446 */
5447 #ifndef _LP64
5448 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5449 int newfd = ::fcntl(fd, F_DUPFD, 256);
5450 if (newfd != -1) {
5451 ::close(fd);
5452 fd = newfd;
5453 }
5454 }
5455 #endif // 32-bit Solaris
5456 /*
5457 * All file descriptors that are opened in the JVM and not
5458 * specifically destined for a subprocess should have the
5459 * close-on-exec flag set. If we don't set it, then careless 3rd
5460 * party native code might fork and exec without closing all
5461 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5462 * UNIXProcess.c), and this in turn might:
5463 *
5464 * - cause end-of-file to fail to be detected on some file
5465 * descriptors, resulting in mysterious hangs, or
5466 *
5467 * - might cause an fopen in the subprocess to fail on a system
5468 * suffering from bug 1085341.
5469 *
5470 * (Yes, the default setting of the close-on-exec flag is a Unix
5471 * design flaw)
5472 *
5473 * See:
5474 * 1085341: 32-bit stdio routines should support file descriptors >255
5475 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5476 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5477 */
5478 #ifdef FD_CLOEXEC
5479 {
5480 int flags = ::fcntl(fd, F_GETFD);
5481 if (flags != -1)
5482 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5483 }
5484 #endif
5485
5486 if (o_delete != 0) {
5487 ::unlink(path);
5488 }
5489 return fd;
5490 }
5491
5492 // create binary file, rewriting existing file if required
5493 int os::create_binary_file(const char* path, bool rewrite_existing) {
5494 int oflags = O_WRONLY | O_CREAT;
5495 if (!rewrite_existing) {
5496 oflags |= O_EXCL;
5497 }
5498 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5499 }
5500
5501 // return current position of file pointer
5502 jlong os::current_file_offset(int fd) {
5503 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5504 }
5505
5506 // move file pointer to the specified offset
5507 jlong os::seek_to_file_offset(int fd, jlong offset) {
5508 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5509 }
5510
5511 jlong os::lseek(int fd, jlong offset, int whence) {
5512 return (jlong) ::lseek64(fd, offset, whence);
5513 }
5514
5515 char * os::native_path(char *path) {
5516 return path;
5517 }
5518
5519 int os::ftruncate(int fd, jlong length) {
5520 return ::ftruncate64(fd, length);
5521 }
5522
5523 int os::fsync(int fd) {
5524 RESTARTABLE_RETURN_INT(::fsync(fd));
5525 }
5526
5527 int os::available(int fd, jlong *bytes) {
5528 jlong cur, end;
5529 int mode;
5530 struct stat64 buf64;
5531
5532 if (::fstat64(fd, &buf64) >= 0) {
5533 mode = buf64.st_mode;
5534 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5535 /*
5536 * XXX: is the following call interruptible? If so, this might
5537 * need to go through the INTERRUPT_IO() wrapper as for other
5538 * blocking, interruptible calls in this file.
5539 */
5540 int n,ioctl_return;
5541
5542 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5543 if (ioctl_return>= 0) {
5544 *bytes = n;
5545 return 1;
5546 }
5547 }
5548 }
5549 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5550 return 0;
5551 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5552 return 0;
5553 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5554 return 0;
5555 }
5556 *bytes = end - cur;
5557 return 1;
5558 }
5559
5560 // Map a block of memory.
5561 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5562 char *addr, size_t bytes, bool read_only,
5563 bool allow_exec) {
5564 int prot;
5565 int flags;
5566
5567 if (read_only) {
5568 prot = PROT_READ;
5569 flags = MAP_SHARED;
5570 } else {
5571 prot = PROT_READ | PROT_WRITE;
5572 flags = MAP_PRIVATE;
5573 }
5574
5575 if (allow_exec) {
5576 prot |= PROT_EXEC;
5577 }
5578
5579 if (addr != NULL) {
5580 flags |= MAP_FIXED;
5581 }
5582
5583 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5584 fd, file_offset);
5585 if (mapped_address == MAP_FAILED) {
5586 return NULL;
5587 }
5588 return mapped_address;
5589 }
5590
5591
5592 // Remap a block of memory.
5593 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5594 char *addr, size_t bytes, bool read_only,
5595 bool allow_exec) {
5596 // same as map_memory() on this OS
5597 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5598 allow_exec);
5599 }
5600
5601
5602 // Unmap a block of memory.
5603 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5604 return munmap(addr, bytes) == 0;
5605 }
5606
5607 void os::pause() {
5608 char filename[MAX_PATH];
5609 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5610 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5611 } else {
5612 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5613 }
5614
5615 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5616 if (fd != -1) {
5617 struct stat buf;
5618 ::close(fd);
5619 while (::stat(filename, &buf) == 0) {
5620 (void)::poll(NULL, 0, 100);
5621 }
5622 } else {
5623 jio_fprintf(stderr,
5624 "Could not open pause file '%s', continuing immediately.\n", filename);
5625 }
5626 }
5627
5628 #ifndef PRODUCT
5629 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5630 // Turn this on if you need to trace synch operations.
5631 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5632 // and call record_synch_enable and record_synch_disable
5633 // around the computation of interest.
5634
5635 void record_synch(char* name, bool returning); // defined below
5636
5637 class RecordSynch {
5638 char* _name;
5639 public:
5640 RecordSynch(char* name) :_name(name)
5641 { record_synch(_name, false); }
5642 ~RecordSynch() { record_synch(_name, true); }
5643 };
5644
5645 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5646 extern "C" ret name params { \
5647 typedef ret name##_t params; \
5648 static name##_t* implem = NULL; \
5649 static int callcount = 0; \
5650 if (implem == NULL) { \
5651 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5652 if (implem == NULL) fatal(dlerror()); \
5653 } \
5654 ++callcount; \
5655 RecordSynch _rs(#name); \
5656 inner; \
5657 return implem args; \
5658 }
5659 // in dbx, examine callcounts this way:
5660 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5661
5662 #define CHECK_POINTER_OK(p) \
5663 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5664 #define CHECK_MU \
5665 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5666 #define CHECK_CV \
5667 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5668 #define CHECK_P(p) \
5669 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5670
5671 #define CHECK_MUTEX(mutex_op) \
5672 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5673
5674 CHECK_MUTEX( mutex_lock)
5675 CHECK_MUTEX( _mutex_lock)
5676 CHECK_MUTEX( mutex_unlock)
5677 CHECK_MUTEX(_mutex_unlock)
5678 CHECK_MUTEX( mutex_trylock)
5679 CHECK_MUTEX(_mutex_trylock)
5680
5681 #define CHECK_COND(cond_op) \
5682 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5683
5684 CHECK_COND( cond_wait);
5685 CHECK_COND(_cond_wait);
5686 CHECK_COND(_cond_wait_cancel);
5687
5688 #define CHECK_COND2(cond_op) \
5689 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5690
5691 CHECK_COND2( cond_timedwait);
5692 CHECK_COND2(_cond_timedwait);
5693 CHECK_COND2(_cond_timedwait_cancel);
5694
5695 // do the _lwp_* versions too
5696 #define mutex_t lwp_mutex_t
5697 #define cond_t lwp_cond_t
5698 CHECK_MUTEX( _lwp_mutex_lock)
5699 CHECK_MUTEX( _lwp_mutex_unlock)
5700 CHECK_MUTEX( _lwp_mutex_trylock)
5701 CHECK_MUTEX( __lwp_mutex_lock)
5702 CHECK_MUTEX( __lwp_mutex_unlock)
5703 CHECK_MUTEX( __lwp_mutex_trylock)
5704 CHECK_MUTEX(___lwp_mutex_lock)
5705 CHECK_MUTEX(___lwp_mutex_unlock)
5706
5707 CHECK_COND( _lwp_cond_wait);
5708 CHECK_COND( __lwp_cond_wait);
5709 CHECK_COND(___lwp_cond_wait);
5710
5711 CHECK_COND2( _lwp_cond_timedwait);
5712 CHECK_COND2( __lwp_cond_timedwait);
5713 #undef mutex_t
5714 #undef cond_t
5715
5716 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5717 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5718 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5719 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5720 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5721 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5722 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5723 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5724
5725
5726 // recording machinery:
5727
5728 enum { RECORD_SYNCH_LIMIT = 200 };
5729 char* record_synch_name[RECORD_SYNCH_LIMIT];
5730 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5731 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5732 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5733 int record_synch_count = 0;
5734 bool record_synch_enabled = false;
5735
5736 // in dbx, examine recorded data this way:
5737 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5738
5739 void record_synch(char* name, bool returning) {
5740 if (record_synch_enabled) {
5741 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5742 record_synch_name[record_synch_count] = name;
5743 record_synch_returning[record_synch_count] = returning;
5744 record_synch_thread[record_synch_count] = thr_self();
5745 record_synch_arg0ptr[record_synch_count] = &name;
5746 record_synch_count++;
5747 }
5748 // put more checking code here:
5749 // ...
5750 }
5751 }
5752
5753 void record_synch_enable() {
5754 // start collecting trace data, if not already doing so
5755 if (!record_synch_enabled) record_synch_count = 0;
5756 record_synch_enabled = true;
5757 }
5758
5759 void record_synch_disable() {
5760 // stop collecting trace data
5761 record_synch_enabled = false;
5762 }
5763
5764 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5765 #endif // PRODUCT
5766
5767 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5768 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5769 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5770
5771
5772 // JVMTI & JVM monitoring and management support
5773 // The thread_cpu_time() and current_thread_cpu_time() are only
5774 // supported if is_thread_cpu_time_supported() returns true.
5775 // They are not supported on Solaris T1.
5776
5777 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5778 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5779 // of a thread.
5780 //
5781 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5782 // returns the fast estimate available on the platform.
5783
5784 // hrtime_t gethrvtime() return value includes
5785 // user time but does not include system time
5786 jlong os::current_thread_cpu_time() {
5787 return (jlong) gethrvtime();
5788 }
5789
5790 jlong os::thread_cpu_time(Thread *thread) {
5791 // return user level CPU time only to be consistent with
5792 // what current_thread_cpu_time returns.
5793 // thread_cpu_time_info() must be changed if this changes
5794 return os::thread_cpu_time(thread, false /* user time only */);
5795 }
5796
5797 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5798 if (user_sys_cpu_time) {
5799 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5800 } else {
5801 return os::current_thread_cpu_time();
5802 }
5803 }
5804
5805 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5806 char proc_name[64];
5807 int count;
5808 prusage_t prusage;
5809 jlong lwp_time;
5810 int fd;
5811
5812 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5813 getpid(),
5814 thread->osthread()->lwp_id());
5815 fd = ::open(proc_name, O_RDONLY);
5816 if ( fd == -1 ) return -1;
5817
5818 do {
5819 count = ::pread(fd,
5820 (void *)&prusage.pr_utime,
5821 thr_time_size,
5822 thr_time_off);
5823 } while (count < 0 && errno == EINTR);
5824 ::close(fd);
5825 if ( count < 0 ) return -1;
5826
5827 if (user_sys_cpu_time) {
5828 // user + system CPU time
5829 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5830 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5831 (jlong)prusage.pr_stime.tv_nsec +
5832 (jlong)prusage.pr_utime.tv_nsec;
5833 } else {
5834 // user level CPU time only
5835 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5836 (jlong)prusage.pr_utime.tv_nsec;
5837 }
5838
5839 return(lwp_time);
5840 }
5841
5842 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5843 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5844 info_ptr->may_skip_backward = false; // elapsed time not wall time
5845 info_ptr->may_skip_forward = false; // elapsed time not wall time
5846 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5847 }
5848
5849 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5850 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5851 info_ptr->may_skip_backward = false; // elapsed time not wall time
5852 info_ptr->may_skip_forward = false; // elapsed time not wall time
5853 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5854 }
5855
5856 bool os::is_thread_cpu_time_supported() {
5857 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5858 return true;
5859 } else {
5860 return false;
5861 }
5862 }
5863
5864 // System loadavg support. Returns -1 if load average cannot be obtained.
5865 // Return the load average for our processor set if the primitive exists
5866 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5867 int os::loadavg(double loadavg[], int nelem) {
5868 if (pset_getloadavg_ptr != NULL) {
5869 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5870 } else {
5871 return ::getloadavg(loadavg, nelem);
5872 }
5873 }
5874
5875 //---------------------------------------------------------------------------------
5876
5877 bool os::find(address addr, outputStream* st) {
5878 Dl_info dlinfo;
5879 memset(&dlinfo, 0, sizeof(dlinfo));
5880 if (dladdr(addr, &dlinfo) != 0) {
5881 st->print(PTR_FORMAT ": ", addr);
5882 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5883 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5884 } else if (dlinfo.dli_fbase != NULL)
5885 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5886 else
5887 st->print("<absolute address>");
5888 if (dlinfo.dli_fname != NULL) {
5889 st->print(" in %s", dlinfo.dli_fname);
5890 }
5891 if (dlinfo.dli_fbase != NULL) {
5892 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5893 }
5894 st->cr();
5895
5896 if (Verbose) {
5897 // decode some bytes around the PC
5898 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5899 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5900 address lowest = (address) dlinfo.dli_sname;
5901 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5902 if (begin < lowest) begin = lowest;
5903 Dl_info dlinfo2;
5904 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5905 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5906 end = (address) dlinfo2.dli_saddr;
5907 Disassembler::decode(begin, end, st);
5908 }
5909 return true;
5910 }
5911 return false;
5912 }
5913
5914 // Following function has been added to support HotSparc's libjvm.so running
5915 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5916 // src/solaris/hpi/native_threads in the EVM codebase.
5917 //
5918 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5919 // libraries and should thus be removed. We will leave it behind for a while
5920 // until we no longer want to able to run on top of 1.3.0 Solaris production
5921 // JDK. See 4341971.
5922
5923 #define STACK_SLACK 0x800
5924
5925 extern "C" {
5926 intptr_t sysThreadAvailableStackWithSlack() {
5927 stack_t st;
5928 intptr_t retval, stack_top;
5929 retval = thr_stksegment(&st);
5930 assert(retval == 0, "incorrect return value from thr_stksegment");
5931 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5932 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5933 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5934 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5935 }
5936 }
5937
5938 // ObjectMonitor park-unpark infrastructure ...
5939 //
5940 // We implement Solaris and Linux PlatformEvents with the
5941 // obvious condvar-mutex-flag triple.
5942 // Another alternative that works quite well is pipes:
5943 // Each PlatformEvent consists of a pipe-pair.
5944 // The thread associated with the PlatformEvent
5945 // calls park(), which reads from the input end of the pipe.
5946 // Unpark() writes into the other end of the pipe.
5947 // The write-side of the pipe must be set NDELAY.
5948 // Unfortunately pipes consume a large # of handles.
5949 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5950 // Using pipes for the 1st few threads might be workable, however.
5951 //
5952 // park() is permitted to return spuriously.
5953 // Callers of park() should wrap the call to park() in
5954 // an appropriate loop. A litmus test for the correct
5955 // usage of park is the following: if park() were modified
5956 // to immediately return 0 your code should still work,
5957 // albeit degenerating to a spin loop.
5958 //
5959 // An interesting optimization for park() is to use a trylock()
5960 // to attempt to acquire the mutex. If the trylock() fails
5961 // then we know that a concurrent unpark() operation is in-progress.
5962 // in that case the park() code could simply set _count to 0
5963 // and return immediately. The subsequent park() operation *might*
5964 // return immediately. That's harmless as the caller of park() is
5965 // expected to loop. By using trylock() we will have avoided a
5966 // avoided a context switch caused by contention on the per-thread mutex.
5967 //
5968 // TODO-FIXME:
5969 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5970 // objectmonitor implementation.
5971 // 2. Collapse the JSR166 parker event, and the
5972 // objectmonitor ParkEvent into a single "Event" construct.
5973 // 3. In park() and unpark() add:
5974 // assert (Thread::current() == AssociatedWith).
5975 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5976 // 1-out-of-N park() operations will return immediately.
5977 //
5978 // _Event transitions in park()
5979 // -1 => -1 : illegal
5980 // 1 => 0 : pass - return immediately
5981 // 0 => -1 : block
5982 //
5983 // _Event serves as a restricted-range semaphore.
5984 //
5985 // Another possible encoding of _Event would be with
5986 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5987 //
5988 // TODO-FIXME: add DTRACE probes for:
5989 // 1. Tx parks
5990 // 2. Ty unparks Tx
5991 // 3. Tx resumes from park
5992
5993
5994 // value determined through experimentation
5995 #define ROUNDINGFIX 11
5996
5997 // utility to compute the abstime argument to timedwait.
5998 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5999
6000 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
6001 // millis is the relative timeout time
6002 // abstime will be the absolute timeout time
6003 if (millis < 0) millis = 0;
6004 struct timeval now;
6005 int status = gettimeofday(&now, NULL);
6006 assert(status == 0, "gettimeofday");
6007 jlong seconds = millis / 1000;
6008 jlong max_wait_period;
6009
6010 if (UseLWPSynchronization) {
6011 // forward port of fix for 4275818 (not sleeping long enough)
6012 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
6013 // _lwp_cond_timedwait() used a round_down algorithm rather
6014 // than a round_up. For millis less than our roundfactor
6015 // it rounded down to 0 which doesn't meet the spec.
6016 // For millis > roundfactor we may return a bit sooner, but
6017 // since we can not accurately identify the patch level and
6018 // this has already been fixed in Solaris 9 and 8 we will
6019 // leave it alone rather than always rounding down.
6020
6021 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
6022 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
6023 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
6024 max_wait_period = 21000000;
6025 } else {
6026 max_wait_period = 50000000;
6027 }
6028 millis %= 1000;
6029 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
6030 seconds = max_wait_period;
6031 }
6032 abstime->tv_sec = now.tv_sec + seconds;
6033 long usec = now.tv_usec + millis * 1000;
6034 if (usec >= 1000000) {
6035 abstime->tv_sec += 1;
6036 usec -= 1000000;
6037 }
6038 abstime->tv_nsec = usec * 1000;
6039 return abstime;
6040 }
6041
6042 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
6043 // Conceptually TryPark() should be equivalent to park(0).
6044
6045 int os::PlatformEvent::TryPark() {
6046 for (;;) {
6047 const int v = _Event ;
6048 guarantee ((v == 0) || (v == 1), "invariant") ;
6049 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
6050 }
6051 }
6052
6053 void os::PlatformEvent::park() { // AKA: down()
6054 // Invariant: Only the thread associated with the Event/PlatformEvent
6055 // may call park().
6056 int v ;
6057 for (;;) {
6058 v = _Event ;
6059 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6060 }
6061 guarantee (v >= 0, "invariant") ;
6062 if (v == 0) {
6063 // Do this the hard way by blocking ...
6064 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6065 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6066 // Only for SPARC >= V8PlusA
6067 #if defined(__sparc) && defined(COMPILER2)
6068 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6069 #endif
6070 int status = os::Solaris::mutex_lock(_mutex);
6071 assert_status(status == 0, status, "mutex_lock");
6072 guarantee (_nParked == 0, "invariant") ;
6073 ++ _nParked ;
6074 while (_Event < 0) {
6075 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
6076 // Treat this the same as if the wait was interrupted
6077 // With usr/lib/lwp going to kernel, always handle ETIME
6078 status = os::Solaris::cond_wait(_cond, _mutex);
6079 if (status == ETIME) status = EINTR ;
6080 assert_status(status == 0 || status == EINTR, status, "cond_wait");
6081 }
6082 -- _nParked ;
6083 _Event = 0 ;
6084 status = os::Solaris::mutex_unlock(_mutex);
6085 assert_status(status == 0, status, "mutex_unlock");
6086 // Paranoia to ensure our locked and lock-free paths interact
6087 // correctly with each other.
6088 OrderAccess::fence();
6089 }
6090 }
6091
6092 int os::PlatformEvent::park(jlong millis) {
6093 guarantee (_nParked == 0, "invariant") ;
6094 int v ;
6095 for (;;) {
6096 v = _Event ;
6097 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6098 }
6099 guarantee (v >= 0, "invariant") ;
6100 if (v != 0) return OS_OK ;
6101
6102 int ret = OS_TIMEOUT;
6103 timestruc_t abst;
6104 compute_abstime (&abst, millis);
6105
6106 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6107 // For Solaris SPARC set fprs.FEF=0 prior to parking.
6108 // Only for SPARC >= V8PlusA
6109 #if defined(__sparc) && defined(COMPILER2)
6110 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6111 #endif
6112 int status = os::Solaris::mutex_lock(_mutex);
6113 assert_status(status == 0, status, "mutex_lock");
6114 guarantee (_nParked == 0, "invariant") ;
6115 ++ _nParked ;
6116 while (_Event < 0) {
6117 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
6118 assert_status(status == 0 || status == EINTR ||
6119 status == ETIME || status == ETIMEDOUT,
6120 status, "cond_timedwait");
6121 if (!FilterSpuriousWakeups) break ; // previous semantics
6122 if (status == ETIME || status == ETIMEDOUT) break ;
6123 // We consume and ignore EINTR and spurious wakeups.
6124 }
6125 -- _nParked ;
6126 if (_Event >= 0) ret = OS_OK ;
6127 _Event = 0 ;
6128 status = os::Solaris::mutex_unlock(_mutex);
6129 assert_status(status == 0, status, "mutex_unlock");
6130 // Paranoia to ensure our locked and lock-free paths interact
6131 // correctly with each other.
6132 OrderAccess::fence();
6133 return ret;
6134 }
6135
6136 void os::PlatformEvent::unpark() {
6137 // Transitions for _Event:
6138 // 0 :=> 1
6139 // 1 :=> 1
6140 // -1 :=> either 0 or 1; must signal target thread
6141 // That is, we can safely transition _Event from -1 to either
6142 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
6143 // unpark() calls.
6144 // See also: "Semaphores in Plan 9" by Mullender & Cox
6145 //
6146 // Note: Forcing a transition from "-1" to "1" on an unpark() means
6147 // that it will take two back-to-back park() calls for the owning
6148 // thread to block. This has the benefit of forcing a spurious return
6149 // from the first park() call after an unpark() call which will help
6150 // shake out uses of park() and unpark() without condition variables.
6151
6152 if (Atomic::xchg(1, &_Event) >= 0) return;
6153
6154 // If the thread associated with the event was parked, wake it.
6155 // Wait for the thread assoc with the PlatformEvent to vacate.
6156 int status = os::Solaris::mutex_lock(_mutex);
6157 assert_status(status == 0, status, "mutex_lock");
6158 int AnyWaiters = _nParked;
6159 status = os::Solaris::mutex_unlock(_mutex);
6160 assert_status(status == 0, status, "mutex_unlock");
6161 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
6162 if (AnyWaiters != 0) {
6163 // We intentional signal *after* dropping the lock
6164 // to avoid a common class of futile wakeups.
6165 status = os::Solaris::cond_signal(_cond);
6166 assert_status(status == 0, status, "cond_signal");
6167 }
6168 }
6169
6170 // JSR166
6171 // -------------------------------------------------------
6172
6173 /*
6174 * The solaris and linux implementations of park/unpark are fairly
6175 * conservative for now, but can be improved. They currently use a
6176 * mutex/condvar pair, plus _counter.
6177 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6178 * sets count to 1 and signals condvar. Only one thread ever waits
6179 * on the condvar. Contention seen when trying to park implies that someone
6180 * is unparking you, so don't wait. And spurious returns are fine, so there
6181 * is no need to track notifications.
6182 */
6183
6184 #define MAX_SECS 100000000
6185 /*
6186 * This code is common to linux and solaris and will be moved to a
6187 * common place in dolphin.
6188 *
6189 * The passed in time value is either a relative time in nanoseconds
6190 * or an absolute time in milliseconds. Either way it has to be unpacked
6191 * into suitable seconds and nanoseconds components and stored in the
6192 * given timespec structure.
6193 * Given time is a 64-bit value and the time_t used in the timespec is only
6194 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6195 * overflow if times way in the future are given. Further on Solaris versions
6196 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6197 * number of seconds, in abstime, is less than current_time + 100,000,000.
6198 * As it will be 28 years before "now + 100000000" will overflow we can
6199 * ignore overflow and just impose a hard-limit on seconds using the value
6200 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6201 * years from "now".
6202 */
6203 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6204 assert (time > 0, "convertTime");
6205
6206 struct timeval now;
6207 int status = gettimeofday(&now, NULL);
6208 assert(status == 0, "gettimeofday");
6209
6210 time_t max_secs = now.tv_sec + MAX_SECS;
6211
6212 if (isAbsolute) {
6213 jlong secs = time / 1000;
6214 if (secs > max_secs) {
6215 absTime->tv_sec = max_secs;
6216 }
6217 else {
6218 absTime->tv_sec = secs;
6219 }
6220 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6221 }
6222 else {
6223 jlong secs = time / NANOSECS_PER_SEC;
6224 if (secs >= MAX_SECS) {
6225 absTime->tv_sec = max_secs;
6226 absTime->tv_nsec = 0;
6227 }
6228 else {
6229 absTime->tv_sec = now.tv_sec + secs;
6230 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6231 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6232 absTime->tv_nsec -= NANOSECS_PER_SEC;
6233 ++absTime->tv_sec; // note: this must be <= max_secs
6234 }
6235 }
6236 }
6237 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6238 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6239 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6240 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6241 }
6242
6243 void Parker::park(bool isAbsolute, jlong time) {
6244 // Ideally we'd do something useful while spinning, such
6245 // as calling unpackTime().
6246
6247 // Optional fast-path check:
6248 // Return immediately if a permit is available.
6249 // We depend on Atomic::xchg() having full barrier semantics
6250 // since we are doing a lock-free update to _counter.
6251 if (Atomic::xchg(0, &_counter) > 0) return;
6252
6253 // Optional fast-exit: Check interrupt before trying to wait
6254 Thread* thread = Thread::current();
6255 assert(thread->is_Java_thread(), "Must be JavaThread");
6256 JavaThread *jt = (JavaThread *)thread;
6257 if (Thread::is_interrupted(thread, false)) {
6258 return;
6259 }
6260
6261 // First, demultiplex/decode time arguments
6262 timespec absTime;
6263 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6264 return;
6265 }
6266 if (time > 0) {
6267 // Warning: this code might be exposed to the old Solaris time
6268 // round-down bugs. Grep "roundingFix" for details.
6269 unpackTime(&absTime, isAbsolute, time);
6270 }
6271
6272 // Enter safepoint region
6273 // Beware of deadlocks such as 6317397.
6274 // The per-thread Parker:: _mutex is a classic leaf-lock.
6275 // In particular a thread must never block on the Threads_lock while
6276 // holding the Parker:: mutex. If safepoints are pending both the
6277 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6278 ThreadBlockInVM tbivm(jt);
6279
6280 // Don't wait if cannot get lock since interference arises from
6281 // unblocking. Also. check interrupt before trying wait
6282 if (Thread::is_interrupted(thread, false) ||
6283 os::Solaris::mutex_trylock(_mutex) != 0) {
6284 return;
6285 }
6286
6287 int status ;
6288
6289 if (_counter > 0) { // no wait needed
6290 _counter = 0;
6291 status = os::Solaris::mutex_unlock(_mutex);
6292 assert (status == 0, "invariant") ;
6293 // Paranoia to ensure our locked and lock-free paths interact
6294 // correctly with each other and Java-level accesses.
6295 OrderAccess::fence();
6296 return;
6297 }
6298
6299 #ifdef ASSERT
6300 // Don't catch signals while blocked; let the running threads have the signals.
6301 // (This allows a debugger to break into the running thread.)
6302 sigset_t oldsigs;
6303 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6304 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6305 #endif
6306
6307 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6308 jt->set_suspend_equivalent();
6309 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6310
6311 // Do this the hard way by blocking ...
6312 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6313 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6314 // Only for SPARC >= V8PlusA
6315 #if defined(__sparc) && defined(COMPILER2)
6316 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6317 #endif
6318
6319 if (time == 0) {
6320 status = os::Solaris::cond_wait (_cond, _mutex) ;
6321 } else {
6322 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6323 }
6324 // Note that an untimed cond_wait() can sometimes return ETIME on older
6325 // versions of the Solaris.
6326 assert_status(status == 0 || status == EINTR ||
6327 status == ETIME || status == ETIMEDOUT,
6328 status, "cond_timedwait");
6329
6330 #ifdef ASSERT
6331 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6332 #endif
6333 _counter = 0 ;
6334 status = os::Solaris::mutex_unlock(_mutex);
6335 assert_status(status == 0, status, "mutex_unlock") ;
6336 // Paranoia to ensure our locked and lock-free paths interact
6337 // correctly with each other and Java-level accesses.
6338 OrderAccess::fence();
6339
6340 // If externally suspended while waiting, re-suspend
6341 if (jt->handle_special_suspend_equivalent_condition()) {
6342 jt->java_suspend_self();
6343 }
6344 }
6345
6346 void Parker::unpark() {
6347 int s, status ;
6348 status = os::Solaris::mutex_lock (_mutex) ;
6349 assert (status == 0, "invariant") ;
6350 s = _counter;
6351 _counter = 1;
6352 status = os::Solaris::mutex_unlock (_mutex) ;
6353 assert (status == 0, "invariant") ;
6354
6355 if (s < 1) {
6356 status = os::Solaris::cond_signal (_cond) ;
6357 assert (status == 0, "invariant") ;
6358 }
6359 }
6360
6361 extern char** environ;
6362
6363 // Run the specified command in a separate process. Return its exit value,
6364 // or -1 on failure (e.g. can't fork a new process).
6365 // Unlike system(), this function can be called from signal handler. It
6366 // doesn't block SIGINT et al.
6367 int os::fork_and_exec(char* cmd) {
6368 char * argv[4];
6369 argv[0] = (char *)"sh";
6370 argv[1] = (char *)"-c";
6371 argv[2] = cmd;
6372 argv[3] = NULL;
6373
6374 // fork is async-safe, fork1 is not so can't use in signal handler
6375 pid_t pid;
6376 Thread* t = ThreadLocalStorage::get_thread_slow();
6377 if (t != NULL && t->is_inside_signal_handler()) {
6378 pid = fork();
6379 } else {
6380 pid = fork1();
6381 }
6382
6383 if (pid < 0) {
6384 // fork failed
6385 warning("fork failed: %s", strerror(errno));
6386 return -1;
6387
6388 } else if (pid == 0) {
6389 // child process
6390
6391 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6392 execve("/usr/bin/sh", argv, environ);
6393
6394 // execve failed
6395 _exit(-1);
6396
6397 } else {
6398 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6399 // care about the actual exit code, for now.
6400
6401 int status;
6402
6403 // Wait for the child process to exit. This returns immediately if
6404 // the child has already exited. */
6405 while (waitpid(pid, &status, 0) < 0) {
6406 switch (errno) {
6407 case ECHILD: return 0;
6408 case EINTR: break;
6409 default: return -1;
6410 }
6411 }
6412
6413 if (WIFEXITED(status)) {
6414 // The child exited normally; get its exit code.
6415 return WEXITSTATUS(status);
6416 } else if (WIFSIGNALED(status)) {
6417 // The child exited because of a signal
6418 // The best value to return is 0x80 + signal number,
6419 // because that is what all Unix shells do, and because
6420 // it allows callers to distinguish between process exit and
6421 // process death by signal.
6422 return 0x80 + WTERMSIG(status);
6423 } else {
6424 // Unknown exit code; pass it through
6425 return status;
6426 }
6427 }
6428 }
6429
6430 // is_headless_jre()
6431 //
6432 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6433 // in order to report if we are running in a headless jre
6434 //
6435 // Since JDK8 xawt/libmawt.so was moved into the same directory
6436 // as libawt.so, and renamed libawt_xawt.so
6437 //
6438 bool os::is_headless_jre() {
6439 struct stat statbuf;
6440 char buf[MAXPATHLEN];
6441 char libmawtpath[MAXPATHLEN];
6442 const char *xawtstr = "/xawt/libmawt.so";
6443 const char *new_xawtstr = "/libawt_xawt.so";
6444 char *p;
6445
6446 // Get path to libjvm.so
6447 os::jvm_path(buf, sizeof(buf));
6448
6449 // Get rid of libjvm.so
6450 p = strrchr(buf, '/');
6451 if (p == NULL) return false;
6452 else *p = '\0';
6453
6454 // Get rid of client or server
6455 p = strrchr(buf, '/');
6456 if (p == NULL) return false;
6457 else *p = '\0';
6458
6459 // check xawt/libmawt.so
6460 strcpy(libmawtpath, buf);
6461 strcat(libmawtpath, xawtstr);
6462 if (::stat(libmawtpath, &statbuf) == 0) return false;
6463
6464 // check libawt_xawt.so
6465 strcpy(libmawtpath, buf);
6466 strcat(libmawtpath, new_xawtstr);
6467 if (::stat(libmawtpath, &statbuf) == 0) return false;
6468
6469 return true;
6470 }
6471
6472 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6473 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6474 }
6475
6476 int os::close(int fd) {
6477 return ::close(fd);
6478 }
6479
6480 int os::socket_close(int fd) {
6481 return ::close(fd);
6482 }
6483
6484 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6485 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6486 }
6487
6488 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6489 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6490 }
6491
6492 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6493 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6494 }
6495
6496 // As both poll and select can be interrupted by signals, we have to be
6497 // prepared to restart the system call after updating the timeout, unless
6498 // a poll() is done with timeout == -1, in which case we repeat with this
6499 // "wait forever" value.
6500
6501 int os::timeout(int fd, long timeout) {
6502 int res;
6503 struct timeval t;
6504 julong prevtime, newtime;
6505 static const char* aNull = 0;
6506 struct pollfd pfd;
6507 pfd.fd = fd;
6508 pfd.events = POLLIN;
6509
6510 gettimeofday(&t, &aNull);
6511 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6512
6513 for(;;) {
6514 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6515 if(res == OS_ERR && errno == EINTR) {
6516 if(timeout != -1) {
6517 gettimeofday(&t, &aNull);
6518 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6519 timeout -= newtime - prevtime;
6520 if(timeout <= 0)
6521 return OS_OK;
6522 prevtime = newtime;
6523 }
6524 } else return res;
6525 }
6526 }
6527
6528 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6529 int _result;
6530 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6531 os::Solaris::clear_interrupted);
6532
6533 // Depending on when thread interruption is reset, _result could be
6534 // one of two values when errno == EINTR
6535
6536 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6537 && (errno == EINTR)) {
6538 /* restarting a connect() changes its errno semantics */
6539 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6540 os::Solaris::clear_interrupted);
6541 /* undo these changes */
6542 if (_result == OS_ERR) {
6543 if (errno == EALREADY) {
6544 errno = EINPROGRESS; /* fall through */
6545 } else if (errno == EISCONN) {
6546 errno = 0;
6547 return OS_OK;
6548 }
6549 }
6550 }
6551 return _result;
6552 }
6553
6554 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6555 if (fd < 0) {
6556 return OS_ERR;
6557 }
6558 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6559 os::Solaris::clear_interrupted);
6560 }
6561
6562 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6563 sockaddr* from, socklen_t* fromlen) {
6564 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6565 os::Solaris::clear_interrupted);
6566 }
6567
6568 int os::sendto(int fd, char* buf, size_t len, uint flags,
6569 struct sockaddr* to, socklen_t tolen) {
6570 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6571 os::Solaris::clear_interrupted);
6572 }
6573
6574 int os::socket_available(int fd, jint *pbytes) {
6575 if (fd < 0) {
6576 return OS_OK;
6577 }
6578 int ret;
6579 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6580 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6581 // is expected to return 0 on failure and 1 on success to the jdk.
6582 return (ret == OS_ERR) ? 0 : 1;
6583 }
6584
6585 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6586 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6587 os::Solaris::clear_interrupted);
6588 }
6589
6590 // Get the default path to the core file
6591 // Returns the length of the string
6592 int os::get_core_path(char* buffer, size_t bufferSize) {
6593 const char* p = get_current_directory(buffer, bufferSize);
6594
6595 if (p == NULL) {
6596 assert(p != NULL, "failed to get current directory");
6597 return 0;
6598 }
6599
6600 return strlen(buffer);
6601 }
6602
6603 #ifndef PRODUCT
6604 void TestReserveMemorySpecial_test() {
6605 // No tests available for this platform
6606 }
6607 #endif