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