1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // do not include precompiled header file
26 # include "incls/_os_solaris.cpp.incl"
27
28 // put OS-includes here
29 # include <dlfcn.h>
30 # include <errno.h>
31 # include <link.h>
32 # include <poll.h>
33 # include <pthread.h>
34 # include <pwd.h>
35 # include <schedctl.h>
36 # include <setjmp.h>
37 # include <signal.h>
38 # include <stdio.h>
39 # include <alloca.h>
40 # include <sys/filio.h>
41 # include <sys/ipc.h>
42 # include <sys/lwp.h>
43 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
44 # include <sys/mman.h>
45 # include <sys/processor.h>
46 # include <sys/procset.h>
47 # include <sys/pset.h>
48 # include <sys/resource.h>
49 # include <sys/shm.h>
50 # include <sys/socket.h>
51 # include <sys/stat.h>
52 # include <sys/systeminfo.h>
53 # include <sys/time.h>
54 # include <sys/times.h>
55 # include <sys/types.h>
56 # include <sys/wait.h>
57 # include <sys/utsname.h>
58 # include <thread.h>
59 # include <unistd.h>
60 # include <sys/priocntl.h>
61 # include <sys/rtpriocntl.h>
62 # include <sys/tspriocntl.h>
63 # include <sys/iapriocntl.h>
64 # include <sys/loadavg.h>
65 # include <string.h>
66
67 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
68 # include <sys/procfs.h> // see comment in <sys/procfs.h>
69
70 #define MAX_PATH (2 * K)
71
72 // for timer info max values which include all bits
73 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
74
75 #ifdef _GNU_SOURCE
76 // See bug #6514594
77 extern "C" int madvise(caddr_t, size_t, int);
78 extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg,
79 int attr, int mask);
80 #endif //_GNU_SOURCE
81
82 /*
83 MPSS Changes Start.
84 The JVM binary needs to be built and run on pre-Solaris 9
85 systems, but the constants needed by MPSS are only in Solaris 9
86 header files. They are textually replicated here to allow
87 building on earlier systems. Once building on Solaris 8 is
88 no longer a requirement, these #defines can be replaced by ordinary
89 system .h inclusion.
90
91 In earlier versions of the JDK and Solaris, we used ISM for large pages.
92 But ISM requires shared memory to achieve this and thus has many caveats.
93 MPSS is a fully transparent and is a cleaner way to get large pages.
94 Although we still require keeping ISM for backward compatiblitiy as well as
95 giving the opportunity to use large pages on older systems it is
96 recommended that MPSS be used for Solaris 9 and above.
97
98 */
99
100 #ifndef MC_HAT_ADVISE
101
102 struct memcntl_mha {
103 uint_t mha_cmd; /* command(s) */
104 uint_t mha_flags;
105 size_t mha_pagesize;
106 };
107 #define MC_HAT_ADVISE 7 /* advise hat map size */
108 #define MHA_MAPSIZE_VA 0x1 /* set preferred page size */
109 #define MAP_ALIGN 0x200 /* addr specifies alignment */
110
111 #endif
112 // MPSS Changes End.
113
114
115 // Here are some liblgrp types from sys/lgrp_user.h to be able to
116 // compile on older systems without this header file.
117
118 #ifndef MADV_ACCESS_LWP
119 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
120 #endif
121 #ifndef MADV_ACCESS_MANY
122 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
123 #endif
124
125 #ifndef LGRP_RSRC_CPU
126 # define LGRP_RSRC_CPU 0 /* CPU resources */
127 #endif
128 #ifndef LGRP_RSRC_MEM
129 # define LGRP_RSRC_MEM 1 /* memory resources */
130 #endif
131
132 // Some more macros from sys/mman.h that are not present in Solaris 8.
133
134 #ifndef MAX_MEMINFO_CNT
135 /*
136 * info_req request type definitions for meminfo
137 * request types starting with MEMINFO_V are used for Virtual addresses
138 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical
139 * addresses
140 */
141 # define MEMINFO_SHIFT 16
142 # define MEMINFO_MASK (0xFF << MEMINFO_SHIFT)
143 # define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */
144 # define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */
145 # define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */
146 # define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */
147 # define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */
148 # define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */
149 # define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */
150
151 /* maximum number of addresses meminfo() can process at a time */
152 # define MAX_MEMINFO_CNT 256
153
154 /* maximum number of request types */
155 # define MAX_MEMINFO_REQ 31
156 #endif
157
158 // see thr_setprio(3T) for the basis of these numbers
159 #define MinimumPriority 0
160 #define NormalPriority 64
161 #define MaximumPriority 127
162
163 // Values for ThreadPriorityPolicy == 1
164 int prio_policy1[MaxPriority+1] = { -99999, 0, 16, 32, 48, 64,
165 80, 96, 112, 124, 127 };
166
167 // System parameters used internally
168 static clock_t clock_tics_per_sec = 100;
169
170 // For diagnostics to print a message once. see run_periodic_checks
171 static bool check_addr0_done = false;
172 static sigset_t check_signal_done;
173 static bool check_signals = true;
174
175 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
176 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
177
178 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
179
180
181 // "default" initializers for missing libc APIs
182 extern "C" {
183 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
184 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
185
186 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
187 static int lwp_cond_destroy(cond_t *cv) { return 0; }
188 }
189
190 // "default" initializers for pthread-based synchronization
191 extern "C" {
192 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
193 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
194 }
195
196 // Thread Local Storage
197 // This is common to all Solaris platforms so it is defined here,
198 // in this common file.
199 // The declarations are in the os_cpu threadLS*.hpp files.
200 //
201 // Static member initialization for TLS
202 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
203
204 #ifndef PRODUCT
205 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
206
207 int ThreadLocalStorage::_tcacheHit = 0;
208 int ThreadLocalStorage::_tcacheMiss = 0;
209
210 void ThreadLocalStorage::print_statistics() {
211 int total = _tcacheMiss+_tcacheHit;
212 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
213 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
214 }
215 #undef _PCT
216 #endif // PRODUCT
217
218 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
219 int index) {
220 Thread *thread = get_thread_slow();
221 if (thread != NULL) {
222 address sp = os::current_stack_pointer();
223 guarantee(thread->_stack_base == NULL ||
224 (sp <= thread->_stack_base &&
225 sp >= thread->_stack_base - thread->_stack_size) ||
226 is_error_reported(),
227 "sp must be inside of selected thread stack");
228
229 thread->_self_raw_id = raw_id; // mark for quick retrieval
230 _get_thread_cache[ index ] = thread;
231 }
232 return thread;
233 }
234
235
236 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
237 #define NO_CACHED_THREAD ((Thread*)all_zero)
238
239 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
240
241 // Store the new value before updating the cache to prevent a race
242 // between get_thread_via_cache_slowly() and this store operation.
243 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
244
245 // Update thread cache with new thread if setting on thread create,
246 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
247 uintptr_t raw = pd_raw_thread_id();
248 int ix = pd_cache_index(raw);
249 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
250 }
251
252 void ThreadLocalStorage::pd_init() {
253 for (int i = 0; i < _pd_cache_size; i++) {
254 _get_thread_cache[i] = NO_CACHED_THREAD;
255 }
256 }
257
258 // Invalidate all the caches (happens to be the same as pd_init).
259 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
260
261 #undef NO_CACHED_THREAD
262
263 // END Thread Local Storage
264
265 static inline size_t adjust_stack_size(address base, size_t size) {
266 if ((ssize_t)size < 0) {
267 // 4759953: Compensate for ridiculous stack size.
268 size = max_intx;
269 }
270 if (size > (size_t)base) {
271 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
272 size = (size_t)base;
273 }
274 return size;
275 }
276
277 static inline stack_t get_stack_info() {
278 stack_t st;
279 int retval = thr_stksegment(&st);
280 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
281 assert(retval == 0, "incorrect return value from thr_stksegment");
282 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
283 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
284 return st;
285 }
286
287 address os::current_stack_base() {
288 int r = thr_main() ;
289 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
290 bool is_primordial_thread = r;
291
292 // Workaround 4352906, avoid calls to thr_stksegment by
293 // thr_main after the first one (it looks like we trash
294 // some data, causing the value for ss_sp to be incorrect).
295 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
296 stack_t st = get_stack_info();
297 if (is_primordial_thread) {
298 // cache initial value of stack base
299 os::Solaris::_main_stack_base = (address)st.ss_sp;
300 }
301 return (address)st.ss_sp;
302 } else {
303 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
304 return os::Solaris::_main_stack_base;
305 }
306 }
307
308 size_t os::current_stack_size() {
309 size_t size;
310
311 int r = thr_main() ;
312 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
313 if(!r) {
314 size = get_stack_info().ss_size;
315 } else {
316 struct rlimit limits;
317 getrlimit(RLIMIT_STACK, &limits);
318 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
319 }
320 // base may not be page aligned
321 address base = current_stack_base();
322 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
323 return (size_t)(base - bottom);
324 }
325
326 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
327 return localtime_r(clock, res);
328 }
329
330 // interruptible infrastructure
331
332 // setup_interruptible saves the thread state before going into an
333 // interruptible system call.
334 // The saved state is used to restore the thread to
335 // its former state whether or not an interrupt is received.
336 // Used by classloader os::read
337 // hpi calls skip this layer and stay in _thread_in_native
338
339 void os::Solaris::setup_interruptible(JavaThread* thread) {
340
341 JavaThreadState thread_state = thread->thread_state();
342
343 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
344 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
345 OSThread* osthread = thread->osthread();
346 osthread->set_saved_interrupt_thread_state(thread_state);
347 thread->frame_anchor()->make_walkable(thread);
348 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
349 }
350
351 // Version of setup_interruptible() for threads that are already in
352 // _thread_blocked. Used by os_sleep().
353 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
354 thread->frame_anchor()->make_walkable(thread);
355 }
356
357 JavaThread* os::Solaris::setup_interruptible() {
358 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
359 setup_interruptible(thread);
360 return thread;
361 }
362
363 void os::Solaris::try_enable_extended_io() {
364 typedef int (*enable_extended_FILE_stdio_t)(int, int);
365
366 if (!UseExtendedFileIO) {
367 return;
368 }
369
370 enable_extended_FILE_stdio_t enabler =
371 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
372 "enable_extended_FILE_stdio");
373 if (enabler) {
374 enabler(-1, -1);
375 }
376 }
377
378
379 #ifdef ASSERT
380
381 JavaThread* os::Solaris::setup_interruptible_native() {
382 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
383 JavaThreadState thread_state = thread->thread_state();
384 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
385 return thread;
386 }
387
388 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
389 JavaThreadState thread_state = thread->thread_state();
390 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
391 }
392 #endif
393
394 // cleanup_interruptible reverses the effects of setup_interruptible
395 // setup_interruptible_already_blocked() does not need any cleanup.
396
397 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
398 OSThread* osthread = thread->osthread();
399
400 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
401 }
402
403 // I/O interruption related counters called in _INTERRUPTIBLE
404
405 void os::Solaris::bump_interrupted_before_count() {
406 RuntimeService::record_interrupted_before_count();
407 }
408
409 void os::Solaris::bump_interrupted_during_count() {
410 RuntimeService::record_interrupted_during_count();
411 }
412
413 static int _processors_online = 0;
414
415 jint os::Solaris::_os_thread_limit = 0;
416 volatile jint os::Solaris::_os_thread_count = 0;
417
418 julong os::available_memory() {
419 return Solaris::available_memory();
420 }
421
422 julong os::Solaris::available_memory() {
423 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
424 }
425
426 julong os::Solaris::_physical_memory = 0;
427
428 julong os::physical_memory() {
429 return Solaris::physical_memory();
430 }
431
432 julong os::allocatable_physical_memory(julong size) {
433 #ifdef _LP64
434 return size;
435 #else
436 julong result = MIN2(size, (julong)3835*M);
437 if (!is_allocatable(result)) {
438 // Memory allocations will be aligned but the alignment
439 // is not known at this point. Alignments will
440 // be at most to LargePageSizeInBytes. Protect
441 // allocations from alignments up to illegal
442 // values. If at this point 2G is illegal.
443 julong reasonable_size = (julong)2*G - 2 * LargePageSizeInBytes;
444 result = MIN2(size, reasonable_size);
445 }
446 return result;
447 #endif
448 }
449
450 static hrtime_t first_hrtime = 0;
451 static const hrtime_t hrtime_hz = 1000*1000*1000;
452 const int LOCK_BUSY = 1;
453 const int LOCK_FREE = 0;
454 const int LOCK_INVALID = -1;
455 static volatile hrtime_t max_hrtime = 0;
456 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress
457
458
459 void os::Solaris::initialize_system_info() {
460 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
461 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
462 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
463 }
464
465 int os::active_processor_count() {
466 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
467 pid_t pid = getpid();
468 psetid_t pset = PS_NONE;
469 // Are we running in a processor set or is there any processor set around?
470 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
471 uint_t pset_cpus;
472 // Query the number of cpus available to us.
473 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
474 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
475 _processors_online = pset_cpus;
476 return pset_cpus;
477 }
478 }
479 // Otherwise return number of online cpus
480 return online_cpus;
481 }
482
483 static bool find_processors_in_pset(psetid_t pset,
484 processorid_t** id_array,
485 uint_t* id_length) {
486 bool result = false;
487 // Find the number of processors in the processor set.
488 if (pset_info(pset, NULL, id_length, NULL) == 0) {
489 // Make up an array to hold their ids.
490 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length);
491 // Fill in the array with their processor ids.
492 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
493 result = true;
494 }
495 }
496 return result;
497 }
498
499 // Callers of find_processors_online() must tolerate imprecise results --
500 // the system configuration can change asynchronously because of DR
501 // or explicit psradm operations.
502 //
503 // We also need to take care that the loop (below) terminates as the
504 // number of processors online can change between the _SC_NPROCESSORS_ONLN
505 // request and the loop that builds the list of processor ids. Unfortunately
506 // there's no reliable way to determine the maximum valid processor id,
507 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
508 // man pages, which claim the processor id set is "sparse, but
509 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
510 // exit the loop.
511 //
512 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
513 // not available on S8.0.
514
515 static bool find_processors_online(processorid_t** id_array,
516 uint* id_length) {
517 const processorid_t MAX_PROCESSOR_ID = 100000 ;
518 // Find the number of processors online.
519 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
520 // Make up an array to hold their ids.
521 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length);
522 // Processors need not be numbered consecutively.
523 long found = 0;
524 processorid_t next = 0;
525 while (found < *id_length && next < MAX_PROCESSOR_ID) {
526 processor_info_t info;
527 if (processor_info(next, &info) == 0) {
528 // NB, PI_NOINTR processors are effectively online ...
529 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
530 (*id_array)[found] = next;
531 found += 1;
532 }
533 }
534 next += 1;
535 }
536 if (found < *id_length) {
537 // The loop above didn't identify the expected number of processors.
538 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
539 // and re-running the loop, above, but there's no guarantee of progress
540 // if the system configuration is in flux. Instead, we just return what
541 // we've got. Note that in the worst case find_processors_online() could
542 // return an empty set. (As a fall-back in the case of the empty set we
543 // could just return the ID of the current processor).
544 *id_length = found ;
545 }
546
547 return true;
548 }
549
550 static bool assign_distribution(processorid_t* id_array,
551 uint id_length,
552 uint* distribution,
553 uint distribution_length) {
554 // We assume we can assign processorid_t's to uint's.
555 assert(sizeof(processorid_t) == sizeof(uint),
556 "can't convert processorid_t to uint");
557 // Quick check to see if we won't succeed.
558 if (id_length < distribution_length) {
559 return false;
560 }
561 // Assign processor ids to the distribution.
562 // Try to shuffle processors to distribute work across boards,
563 // assuming 4 processors per board.
564 const uint processors_per_board = ProcessDistributionStride;
565 // Find the maximum processor id.
566 processorid_t max_id = 0;
567 for (uint m = 0; m < id_length; m += 1) {
568 max_id = MAX2(max_id, id_array[m]);
569 }
570 // The next id, to limit loops.
571 const processorid_t limit_id = max_id + 1;
572 // Make up markers for available processors.
573 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id);
574 for (uint c = 0; c < limit_id; c += 1) {
575 available_id[c] = false;
576 }
577 for (uint a = 0; a < id_length; a += 1) {
578 available_id[id_array[a]] = true;
579 }
580 // Step by "boards", then by "slot", copying to "assigned".
581 // NEEDS_CLEANUP: The assignment of processors should be stateful,
582 // remembering which processors have been assigned by
583 // previous calls, etc., so as to distribute several
584 // independent calls of this method. What we'd like is
585 // It would be nice to have an API that let us ask
586 // how many processes are bound to a processor,
587 // but we don't have that, either.
588 // In the short term, "board" is static so that
589 // subsequent distributions don't all start at board 0.
590 static uint board = 0;
591 uint assigned = 0;
592 // Until we've found enough processors ....
593 while (assigned < distribution_length) {
594 // ... find the next available processor in the board.
595 for (uint slot = 0; slot < processors_per_board; slot += 1) {
596 uint try_id = board * processors_per_board + slot;
597 if ((try_id < limit_id) && (available_id[try_id] == true)) {
598 distribution[assigned] = try_id;
599 available_id[try_id] = false;
600 assigned += 1;
601 break;
602 }
603 }
604 board += 1;
605 if (board * processors_per_board + 0 >= limit_id) {
606 board = 0;
607 }
608 }
609 if (available_id != NULL) {
610 FREE_C_HEAP_ARRAY(bool, available_id);
611 }
612 return true;
613 }
614
615 bool os::distribute_processes(uint length, uint* distribution) {
616 bool result = false;
617 // Find the processor id's of all the available CPUs.
618 processorid_t* id_array = NULL;
619 uint id_length = 0;
620 // There are some races between querying information and using it,
621 // since processor sets can change dynamically.
622 psetid_t pset = PS_NONE;
623 // Are we running in a processor set?
624 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
625 result = find_processors_in_pset(pset, &id_array, &id_length);
626 } else {
627 result = find_processors_online(&id_array, &id_length);
628 }
629 if (result == true) {
630 if (id_length >= length) {
631 result = assign_distribution(id_array, id_length, distribution, length);
632 } else {
633 result = false;
634 }
635 }
636 if (id_array != NULL) {
637 FREE_C_HEAP_ARRAY(processorid_t, id_array);
638 }
639 return result;
640 }
641
642 bool os::bind_to_processor(uint processor_id) {
643 // We assume that a processorid_t can be stored in a uint.
644 assert(sizeof(uint) == sizeof(processorid_t),
645 "can't convert uint to processorid_t");
646 int bind_result =
647 processor_bind(P_LWPID, // bind LWP.
648 P_MYID, // bind current LWP.
649 (processorid_t) processor_id, // id.
650 NULL); // don't return old binding.
651 return (bind_result == 0);
652 }
653
654 bool os::getenv(const char* name, char* buffer, int len) {
655 char* val = ::getenv( name );
656 if ( val == NULL
657 || strlen(val) + 1 > len ) {
658 if (len > 0) buffer[0] = 0; // return a null string
659 return false;
660 }
661 strcpy( buffer, val );
662 return true;
663 }
664
665
666 // Return true if user is running as root.
667
668 bool os::have_special_privileges() {
669 static bool init = false;
670 static bool privileges = false;
671 if (!init) {
672 privileges = (getuid() != geteuid()) || (getgid() != getegid());
673 init = true;
674 }
675 return privileges;
676 }
677
678
679 static char* get_property(char* name, char* buffer, int buffer_size) {
680 if (os::getenv(name, buffer, buffer_size)) {
681 return buffer;
682 }
683 static char empty[] = "";
684 return empty;
685 }
686
687
688 void os::init_system_properties_values() {
689 char arch[12];
690 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
691
692 // The next steps are taken in the product version:
693 //
694 // Obtain the JAVA_HOME value from the location of libjvm[_g].so.
695 // This library should be located at:
696 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so.
697 //
698 // If "/jre/lib/" appears at the right place in the path, then we
699 // assume libjvm[_g].so is installed in a JDK and we use this path.
700 //
701 // Otherwise exit with message: "Could not create the Java virtual machine."
702 //
703 // The following extra steps are taken in the debugging version:
704 //
705 // If "/jre/lib/" does NOT appear at the right place in the path
706 // instead of exit check for $JAVA_HOME environment variable.
707 //
708 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
709 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so
710 // it looks like libjvm[_g].so is installed there
711 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so.
712 //
713 // Otherwise exit.
714 //
715 // Important note: if the location of libjvm.so changes this
716 // code needs to be changed accordingly.
717
718 // The next few definitions allow the code to be verbatim:
719 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n))
720 #define free(p) FREE_C_HEAP_ARRAY(char, p)
721 #define getenv(n) ::getenv(n)
722
723 #define EXTENSIONS_DIR "/lib/ext"
724 #define ENDORSED_DIR "/lib/endorsed"
725 #define COMMON_DIR "/usr/jdk/packages"
726
727 {
728 /* sysclasspath, java_home, dll_dir */
729 {
730 char *home_path;
731 char *dll_path;
732 char *pslash;
733 char buf[MAXPATHLEN];
734 os::jvm_path(buf, sizeof(buf));
735
736 // Found the full path to libjvm.so.
737 // Now cut the path to <java_home>/jre if we can.
738 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
739 pslash = strrchr(buf, '/');
740 if (pslash != NULL)
741 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
742 dll_path = malloc(strlen(buf) + 1);
743 if (dll_path == NULL)
744 return;
745 strcpy(dll_path, buf);
746 Arguments::set_dll_dir(dll_path);
747
748 if (pslash != NULL) {
749 pslash = strrchr(buf, '/');
750 if (pslash != NULL) {
751 *pslash = '\0'; /* get rid of /<arch> */
752 pslash = strrchr(buf, '/');
753 if (pslash != NULL)
754 *pslash = '\0'; /* get rid of /lib */
755 }
756 }
757
758 home_path = malloc(strlen(buf) + 1);
759 if (home_path == NULL)
760 return;
761 strcpy(home_path, buf);
762 Arguments::set_java_home(home_path);
763
764 if (!set_boot_path('/', ':'))
765 return;
766 }
767
768 /*
769 * Where to look for native libraries
770 */
771 {
772 // Use dlinfo() to determine the correct java.library.path.
773 //
774 // If we're launched by the Java launcher, and the user
775 // does not set java.library.path explicitly on the commandline,
776 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
777 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
778 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
779 // /usr/lib), which is exactly what we want.
780 //
781 // If the user does set java.library.path, it completely
782 // overwrites this setting, and always has.
783 //
784 // If we're not launched by the Java launcher, we may
785 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
786 // settings. Again, dlinfo does exactly what we want.
787
788 Dl_serinfo _info, *info = &_info;
789 Dl_serpath *path;
790 char* library_path;
791 char *common_path;
792 int i;
793
794 // determine search path count and required buffer size
795 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
796 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
797 }
798
799 // allocate new buffer and initialize
800 info = (Dl_serinfo*)malloc(_info.dls_size);
801 if (info == NULL) {
802 vm_exit_out_of_memory(_info.dls_size,
803 "init_system_properties_values info");
804 }
805 info->dls_size = _info.dls_size;
806 info->dls_cnt = _info.dls_cnt;
807
808 // obtain search path information
809 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
810 free(info);
811 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
812 }
813
814 path = &info->dls_serpath[0];
815
816 // Note: Due to a legacy implementation, most of the library path
817 // is set in the launcher. This was to accomodate linking restrictions
818 // on legacy Solaris implementations (which are no longer supported).
819 // Eventually, all the library path setting will be done here.
820 //
821 // However, to prevent the proliferation of improperly built native
822 // libraries, the new path component /usr/jdk/packages is added here.
823
824 // Determine the actual CPU architecture.
825 char cpu_arch[12];
826 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
827 #ifdef _LP64
828 // If we are a 64-bit vm, perform the following translations:
829 // sparc -> sparcv9
830 // i386 -> amd64
831 if (strcmp(cpu_arch, "sparc") == 0)
832 strcat(cpu_arch, "v9");
833 else if (strcmp(cpu_arch, "i386") == 0)
834 strcpy(cpu_arch, "amd64");
835 #endif
836
837 // Construct the invariant part of ld_library_path. Note that the
838 // space for the colon and the trailing null are provided by the
839 // nulls included by the sizeof operator.
840 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
841 common_path = malloc(bufsize);
842 if (common_path == NULL) {
843 free(info);
844 vm_exit_out_of_memory(bufsize,
845 "init_system_properties_values common_path");
846 }
847 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
848
849 // struct size is more than sufficient for the path components obtained
850 // through the dlinfo() call, so only add additional space for the path
851 // components explicitly added here.
852 bufsize = info->dls_size + strlen(common_path);
853 library_path = malloc(bufsize);
854 if (library_path == NULL) {
855 free(info);
856 free(common_path);
857 vm_exit_out_of_memory(bufsize,
858 "init_system_properties_values library_path");
859 }
860 library_path[0] = '\0';
861
862 // Construct the desired Java library path from the linker's library
863 // search path.
864 //
865 // For compatibility, it is optimal that we insert the additional path
866 // components specific to the Java VM after those components specified
867 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
868 // infrastructure.
869 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
870 strcpy(library_path, common_path);
871 } else {
872 int inserted = 0;
873 for (i = 0; i < info->dls_cnt; i++, path++) {
874 uint_t flags = path->dls_flags & LA_SER_MASK;
875 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
876 strcat(library_path, common_path);
877 strcat(library_path, os::path_separator());
878 inserted = 1;
879 }
880 strcat(library_path, path->dls_name);
881 strcat(library_path, os::path_separator());
882 }
883 // eliminate trailing path separator
884 library_path[strlen(library_path)-1] = '\0';
885 }
886
887 // happens before argument parsing - can't use a trace flag
888 // tty->print_raw("init_system_properties_values: native lib path: ");
889 // tty->print_raw_cr(library_path);
890
891 // callee copies into its own buffer
892 Arguments::set_library_path(library_path);
893
894 free(common_path);
895 free(library_path);
896 free(info);
897 }
898
899 /*
900 * Extensions directories.
901 *
902 * Note that the space for the colon and the trailing null are provided
903 * by the nulls included by the sizeof operator (so actually one byte more
904 * than necessary is allocated).
905 */
906 {
907 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
908 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
909 sizeof(EXTENSIONS_DIR));
910 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
911 Arguments::get_java_home());
912 Arguments::set_ext_dirs(buf);
913 }
914
915 /* Endorsed standards default directory. */
916 {
917 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
918 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
919 Arguments::set_endorsed_dirs(buf);
920 }
921 }
922
923 #undef malloc
924 #undef free
925 #undef getenv
926 #undef EXTENSIONS_DIR
927 #undef ENDORSED_DIR
928 #undef COMMON_DIR
929
930 }
931
932 void os::breakpoint() {
933 BREAKPOINT;
934 }
935
936 bool os::obsolete_option(const JavaVMOption *option)
937 {
938 if (!strncmp(option->optionString, "-Xt", 3)) {
939 return true;
940 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
941 return true;
942 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
943 return true;
944 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
945 return true;
946 }
947 return false;
948 }
949
950 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
951 address stackStart = (address)thread->stack_base();
952 address stackEnd = (address)(stackStart - (address)thread->stack_size());
953 if (sp < stackStart && sp >= stackEnd ) return true;
954 return false;
955 }
956
957 extern "C" void breakpoint() {
958 // use debugger to set breakpoint here
959 }
960
961 // Returns an estimate of the current stack pointer. Result must be guaranteed to
962 // point into the calling threads stack, and be no lower than the current stack
963 // pointer.
964 address os::current_stack_pointer() {
965 volatile int dummy;
966 address sp = (address)&dummy + 8; // %%%% need to confirm if this is right
967 return sp;
968 }
969
970 static thread_t main_thread;
971
972 // Thread start routine for all new Java threads
973 extern "C" void* java_start(void* thread_addr) {
974 // Try to randomize the cache line index of hot stack frames.
975 // This helps when threads of the same stack traces evict each other's
976 // cache lines. The threads can be either from the same JVM instance, or
977 // from different JVM instances. The benefit is especially true for
978 // processors with hyperthreading technology.
979 static int counter = 0;
980 int pid = os::current_process_id();
981 alloca(((pid ^ counter++) & 7) * 128);
982
983 int prio;
984 Thread* thread = (Thread*)thread_addr;
985 OSThread* osthr = thread->osthread();
986
987 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
988 thread->_schedctl = (void *) schedctl_init () ;
989
990 if (UseNUMA) {
991 int lgrp_id = os::numa_get_group_id();
992 if (lgrp_id != -1) {
993 thread->set_lgrp_id(lgrp_id);
994 }
995 }
996
997 // If the creator called set priority before we started,
998 // we need to call set priority now that we have an lwp.
999 // Get the priority from libthread and set the priority
1000 // for the new Solaris lwp.
1001 if ( osthr->thread_id() != -1 ) {
1002 if ( UseThreadPriorities ) {
1003 thr_getprio(osthr->thread_id(), &prio);
1004 if (ThreadPriorityVerbose) {
1005 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT ", setting priority: %d\n",
1006 osthr->thread_id(), osthr->lwp_id(), prio );
1007 }
1008 os::set_native_priority(thread, prio);
1009 }
1010 } else if (ThreadPriorityVerbose) {
1011 warning("Can't set priority in _start routine, thread id hasn't been set\n");
1012 }
1013
1014 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
1015
1016 // initialize signal mask for this thread
1017 os::Solaris::hotspot_sigmask(thread);
1018
1019 thread->run();
1020
1021 // One less thread is executing
1022 // When the VMThread gets here, the main thread may have already exited
1023 // which frees the CodeHeap containing the Atomic::dec code
1024 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
1025 Atomic::dec(&os::Solaris::_os_thread_count);
1026 }
1027
1028 if (UseDetachedThreads) {
1029 thr_exit(NULL);
1030 ShouldNotReachHere();
1031 }
1032 return NULL;
1033 }
1034
1035 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
1036 // Allocate the OSThread object
1037 OSThread* osthread = new OSThread(NULL, NULL);
1038 if (osthread == NULL) return NULL;
1039
1040 // Store info on the Solaris thread into the OSThread
1041 osthread->set_thread_id(thread_id);
1042 osthread->set_lwp_id(_lwp_self());
1043 thread->_schedctl = (void *) schedctl_init () ;
1044
1045 if (UseNUMA) {
1046 int lgrp_id = os::numa_get_group_id();
1047 if (lgrp_id != -1) {
1048 thread->set_lgrp_id(lgrp_id);
1049 }
1050 }
1051
1052 if ( ThreadPriorityVerbose ) {
1053 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1054 osthread->thread_id(), osthread->lwp_id() );
1055 }
1056
1057 // Initial thread state is INITIALIZED, not SUSPENDED
1058 osthread->set_state(INITIALIZED);
1059
1060 return osthread;
1061 }
1062
1063 void os::Solaris::hotspot_sigmask(Thread* thread) {
1064
1065 //Save caller's signal mask
1066 sigset_t sigmask;
1067 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1068 OSThread *osthread = thread->osthread();
1069 osthread->set_caller_sigmask(sigmask);
1070
1071 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1072 if (!ReduceSignalUsage) {
1073 if (thread->is_VM_thread()) {
1074 // Only the VM thread handles BREAK_SIGNAL ...
1075 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1076 } else {
1077 // ... all other threads block BREAK_SIGNAL
1078 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1079 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1080 }
1081 }
1082 }
1083
1084 bool os::create_attached_thread(JavaThread* thread) {
1085 #ifdef ASSERT
1086 thread->verify_not_published();
1087 #endif
1088 OSThread* osthread = create_os_thread(thread, thr_self());
1089 if (osthread == NULL) {
1090 return false;
1091 }
1092
1093 // Initial thread state is RUNNABLE
1094 osthread->set_state(RUNNABLE);
1095 thread->set_osthread(osthread);
1096
1097 // initialize signal mask for this thread
1098 // and save the caller's signal mask
1099 os::Solaris::hotspot_sigmask(thread);
1100
1101 return true;
1102 }
1103
1104 bool os::create_main_thread(JavaThread* thread) {
1105 #ifdef ASSERT
1106 thread->verify_not_published();
1107 #endif
1108 if (_starting_thread == NULL) {
1109 _starting_thread = create_os_thread(thread, main_thread);
1110 if (_starting_thread == NULL) {
1111 return false;
1112 }
1113 }
1114
1115 // The primodial thread is runnable from the start
1116 _starting_thread->set_state(RUNNABLE);
1117
1118 thread->set_osthread(_starting_thread);
1119
1120 // initialize signal mask for this thread
1121 // and save the caller's signal mask
1122 os::Solaris::hotspot_sigmask(thread);
1123
1124 return true;
1125 }
1126
1127 // _T2_libthread is true if we believe we are running with the newer
1128 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1129 bool os::Solaris::_T2_libthread = false;
1130
1131 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1132 // Allocate the OSThread object
1133 OSThread* osthread = new OSThread(NULL, NULL);
1134 if (osthread == NULL) {
1135 return false;
1136 }
1137
1138 if ( ThreadPriorityVerbose ) {
1139 char *thrtyp;
1140 switch ( thr_type ) {
1141 case vm_thread:
1142 thrtyp = (char *)"vm";
1143 break;
1144 case cgc_thread:
1145 thrtyp = (char *)"cgc";
1146 break;
1147 case pgc_thread:
1148 thrtyp = (char *)"pgc";
1149 break;
1150 case java_thread:
1151 thrtyp = (char *)"java";
1152 break;
1153 case compiler_thread:
1154 thrtyp = (char *)"compiler";
1155 break;
1156 case watcher_thread:
1157 thrtyp = (char *)"watcher";
1158 break;
1159 default:
1160 thrtyp = (char *)"unknown";
1161 break;
1162 }
1163 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1164 }
1165
1166 // Calculate stack size if it's not specified by caller.
1167 if (stack_size == 0) {
1168 // The default stack size 1M (2M for LP64).
1169 stack_size = (BytesPerWord >> 2) * K * K;
1170
1171 switch (thr_type) {
1172 case os::java_thread:
1173 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1174 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1175 break;
1176 case os::compiler_thread:
1177 if (CompilerThreadStackSize > 0) {
1178 stack_size = (size_t)(CompilerThreadStackSize * K);
1179 break;
1180 } // else fall through:
1181 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1182 case os::vm_thread:
1183 case os::pgc_thread:
1184 case os::cgc_thread:
1185 case os::watcher_thread:
1186 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1187 break;
1188 }
1189 }
1190 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1191
1192 // Initial state is ALLOCATED but not INITIALIZED
1193 osthread->set_state(ALLOCATED);
1194
1195 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1196 // We got lots of threads. Check if we still have some address space left.
1197 // Need to be at least 5Mb of unreserved address space. We do check by
1198 // trying to reserve some.
1199 const size_t VirtualMemoryBangSize = 20*K*K;
1200 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1201 if (mem == NULL) {
1202 delete osthread;
1203 return false;
1204 } else {
1205 // Release the memory again
1206 os::release_memory(mem, VirtualMemoryBangSize);
1207 }
1208 }
1209
1210 // Setup osthread because the child thread may need it.
1211 thread->set_osthread(osthread);
1212
1213 // Create the Solaris thread
1214 // explicit THR_BOUND for T2_libthread case in case
1215 // that assumption is not accurate, but our alternate signal stack
1216 // handling is based on it which must have bound threads
1217 thread_t tid = 0;
1218 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1219 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1220 (thr_type == vm_thread) ||
1221 (thr_type == cgc_thread) ||
1222 (thr_type == pgc_thread) ||
1223 (thr_type == compiler_thread && BackgroundCompilation)) ?
1224 THR_BOUND : 0);
1225 int status;
1226
1227 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1228 //
1229 // On multiprocessors systems, libthread sometimes under-provisions our
1230 // process with LWPs. On a 30-way systems, for instance, we could have
1231 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1232 // to our process. This can result in under utilization of PEs.
1233 // I suspect the problem is related to libthread's LWP
1234 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1235 // upcall policy.
1236 //
1237 // The following code is palliative -- it attempts to ensure that our
1238 // process has sufficient LWPs to take advantage of multiple PEs.
1239 // Proper long-term cures include using user-level threads bound to LWPs
1240 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1241 // slight timing window with respect to sampling _os_thread_count, but
1242 // the race is benign. Also, we should periodically recompute
1243 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1244 // the number of PEs in our partition. You might be tempted to use
1245 // THR_NEW_LWP here, but I'd recommend against it as that could
1246 // result in undesirable growth of the libthread's LWP pool.
1247 // The fix below isn't sufficient; for instance, it doesn't take into count
1248 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1249 //
1250 // Some pathologies this scheme doesn't handle:
1251 // * Threads can block, releasing the LWPs. The LWPs can age out.
1252 // When a large number of threads become ready again there aren't
1253 // enough LWPs available to service them. This can occur when the
1254 // number of ready threads oscillates.
1255 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1256 //
1257 // Finally, we should call thr_setconcurrency() periodically to refresh
1258 // the LWP pool and thwart the LWP age-out mechanism.
1259 // The "+3" term provides a little slop -- we want to slightly overprovision.
1260
1261 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1262 if (!(flags & THR_BOUND)) {
1263 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1264 }
1265 }
1266 // Although this doesn't hurt, we should warn of undefined behavior
1267 // when using unbound T1 threads with schedctl(). This should never
1268 // happen, as the compiler and VM threads are always created bound
1269 DEBUG_ONLY(
1270 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1271 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1272 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1273 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1274 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1275 }
1276 );
1277
1278
1279 // Mark that we don't have an lwp or thread id yet.
1280 // In case we attempt to set the priority before the thread starts.
1281 osthread->set_lwp_id(-1);
1282 osthread->set_thread_id(-1);
1283
1284 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1285 if (status != 0) {
1286 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1287 perror("os::create_thread");
1288 }
1289 thread->set_osthread(NULL);
1290 // Need to clean up stuff we've allocated so far
1291 delete osthread;
1292 return false;
1293 }
1294
1295 Atomic::inc(&os::Solaris::_os_thread_count);
1296
1297 // Store info on the Solaris thread into the OSThread
1298 osthread->set_thread_id(tid);
1299
1300 // Remember that we created this thread so we can set priority on it
1301 osthread->set_vm_created();
1302
1303 // Set the default thread priority otherwise use NormalPriority
1304
1305 if ( UseThreadPriorities ) {
1306 thr_setprio(tid, (DefaultThreadPriority == -1) ?
1307 java_to_os_priority[NormPriority] :
1308 DefaultThreadPriority);
1309 }
1310
1311 // Initial thread state is INITIALIZED, not SUSPENDED
1312 osthread->set_state(INITIALIZED);
1313
1314 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1315 return true;
1316 }
1317
1318 /* defined for >= Solaris 10. This allows builds on earlier versions
1319 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1320 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1321 * and -XX:+UseAltSigs does nothing since these should have no conflict
1322 */
1323 #if !defined(SIGJVM1)
1324 #define SIGJVM1 39
1325 #define SIGJVM2 40
1326 #endif
1327
1328 debug_only(static bool signal_sets_initialized = false);
1329 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1330 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1331 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1332
1333 bool os::Solaris::is_sig_ignored(int sig) {
1334 struct sigaction oact;
1335 sigaction(sig, (struct sigaction*)NULL, &oact);
1336 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1337 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1338 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1339 return true;
1340 else
1341 return false;
1342 }
1343
1344 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1345 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1346 static bool isJVM1available() {
1347 return SIGJVM1 < SIGRTMIN;
1348 }
1349
1350 void os::Solaris::signal_sets_init() {
1351 // Should also have an assertion stating we are still single-threaded.
1352 assert(!signal_sets_initialized, "Already initialized");
1353 // Fill in signals that are necessarily unblocked for all threads in
1354 // the VM. Currently, we unblock the following signals:
1355 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1356 // by -Xrs (=ReduceSignalUsage));
1357 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1358 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1359 // the dispositions or masks wrt these signals.
1360 // Programs embedding the VM that want to use the above signals for their
1361 // own purposes must, at this time, use the "-Xrs" option to prevent
1362 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1363 // (See bug 4345157, and other related bugs).
1364 // In reality, though, unblocking these signals is really a nop, since
1365 // these signals are not blocked by default.
1366 sigemptyset(&unblocked_sigs);
1367 sigemptyset(&allowdebug_blocked_sigs);
1368 sigaddset(&unblocked_sigs, SIGILL);
1369 sigaddset(&unblocked_sigs, SIGSEGV);
1370 sigaddset(&unblocked_sigs, SIGBUS);
1371 sigaddset(&unblocked_sigs, SIGFPE);
1372
1373 if (isJVM1available) {
1374 os::Solaris::set_SIGinterrupt(SIGJVM1);
1375 os::Solaris::set_SIGasync(SIGJVM2);
1376 } else if (UseAltSigs) {
1377 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1378 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1379 } else {
1380 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1381 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1382 }
1383
1384 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1385 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1386
1387 if (!ReduceSignalUsage) {
1388 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1389 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1390 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1391 }
1392 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1393 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1394 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1395 }
1396 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1397 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1398 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1399 }
1400 }
1401 // Fill in signals that are blocked by all but the VM thread.
1402 sigemptyset(&vm_sigs);
1403 if (!ReduceSignalUsage)
1404 sigaddset(&vm_sigs, BREAK_SIGNAL);
1405 debug_only(signal_sets_initialized = true);
1406
1407 // For diagnostics only used in run_periodic_checks
1408 sigemptyset(&check_signal_done);
1409 }
1410
1411 // These are signals that are unblocked while a thread is running Java.
1412 // (For some reason, they get blocked by default.)
1413 sigset_t* os::Solaris::unblocked_signals() {
1414 assert(signal_sets_initialized, "Not initialized");
1415 return &unblocked_sigs;
1416 }
1417
1418 // These are the signals that are blocked while a (non-VM) thread is
1419 // running Java. Only the VM thread handles these signals.
1420 sigset_t* os::Solaris::vm_signals() {
1421 assert(signal_sets_initialized, "Not initialized");
1422 return &vm_sigs;
1423 }
1424
1425 // These are signals that are blocked during cond_wait to allow debugger in
1426 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1427 assert(signal_sets_initialized, "Not initialized");
1428 return &allowdebug_blocked_sigs;
1429 }
1430
1431 // First crack at OS-specific initialization, from inside the new thread.
1432 void os::initialize_thread() {
1433 int r = thr_main() ;
1434 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1435 if (r) {
1436 JavaThread* jt = (JavaThread *)Thread::current();
1437 assert(jt != NULL,"Sanity check");
1438 size_t stack_size;
1439 address base = jt->stack_base();
1440 if (Arguments::created_by_java_launcher()) {
1441 // Use 2MB to allow for Solaris 7 64 bit mode.
1442 stack_size = JavaThread::stack_size_at_create() == 0
1443 ? 2048*K : JavaThread::stack_size_at_create();
1444
1445 // There are rare cases when we may have already used more than
1446 // the basic stack size allotment before this method is invoked.
1447 // Attempt to allow for a normally sized java_stack.
1448 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1449 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1450 } else {
1451 // 6269555: If we were not created by a Java launcher, i.e. if we are
1452 // running embedded in a native application, treat the primordial thread
1453 // as much like a native attached thread as possible. This means using
1454 // the current stack size from thr_stksegment(), unless it is too large
1455 // to reliably setup guard pages. A reasonable max size is 8MB.
1456 size_t current_size = current_stack_size();
1457 // This should never happen, but just in case....
1458 if (current_size == 0) current_size = 2 * K * K;
1459 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1460 }
1461 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1462 stack_size = (size_t)(base - bottom);
1463
1464 assert(stack_size > 0, "Stack size calculation problem");
1465
1466 if (stack_size > jt->stack_size()) {
1467 NOT_PRODUCT(
1468 struct rlimit limits;
1469 getrlimit(RLIMIT_STACK, &limits);
1470 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1471 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1472 )
1473 tty->print_cr(
1474 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1475 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1476 "See limit(1) to increase the stack size limit.",
1477 stack_size / K, jt->stack_size() / K);
1478 vm_exit(1);
1479 }
1480 assert(jt->stack_size() >= stack_size,
1481 "Attempt to map more stack than was allocated");
1482 jt->set_stack_size(stack_size);
1483 }
1484
1485 // 5/22/01: Right now alternate signal stacks do not handle
1486 // throwing stack overflow exceptions, see bug 4463178
1487 // Until a fix is found for this, T2 will NOT imply alternate signal
1488 // stacks.
1489 // If using T2 libthread threads, install an alternate signal stack.
1490 // Because alternate stacks associate with LWPs on Solaris,
1491 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1492 // we prefer to explicitly stack bang.
1493 // If not using T2 libthread, but using UseBoundThreads any threads
1494 // (primordial thread, jni_attachCurrentThread) we do not create,
1495 // probably are not bound, therefore they can not have an alternate
1496 // signal stack. Since our stack banging code is generated and
1497 // is shared across threads, all threads must be bound to allow
1498 // using alternate signal stacks. The alternative is to interpose
1499 // on _lwp_create to associate an alt sig stack with each LWP,
1500 // and this could be a problem when the JVM is embedded.
1501 // We would prefer to use alternate signal stacks with T2
1502 // Since there is currently no accurate way to detect T2
1503 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1504 // on installing alternate signal stacks
1505
1506
1507 // 05/09/03: removed alternate signal stack support for Solaris
1508 // The alternate signal stack mechanism is no longer needed to
1509 // handle stack overflow. This is now handled by allocating
1510 // guard pages (red zone) and stackbanging.
1511 // Initially the alternate signal stack mechanism was removed because
1512 // it did not work with T1 llibthread. Alternate
1513 // signal stacks MUST have all threads bound to lwps. Applications
1514 // can create their own threads and attach them without their being
1515 // bound under T1. This is frequently the case for the primordial thread.
1516 // If we were ever to reenable this mechanism we would need to
1517 // use the dynamic check for T2 libthread.
1518
1519 os::Solaris::init_thread_fpu_state();
1520 }
1521
1522
1523
1524 // Free Solaris resources related to the OSThread
1525 void os::free_thread(OSThread* osthread) {
1526 assert(osthread != NULL, "os::free_thread but osthread not set");
1527
1528
1529 // We are told to free resources of the argument thread,
1530 // but we can only really operate on the current thread.
1531 // The main thread must take the VMThread down synchronously
1532 // before the main thread exits and frees up CodeHeap
1533 guarantee((Thread::current()->osthread() == osthread
1534 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1535 if (Thread::current()->osthread() == osthread) {
1536 // Restore caller's signal mask
1537 sigset_t sigmask = osthread->caller_sigmask();
1538 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1539 }
1540 delete osthread;
1541 }
1542
1543 void os::pd_start_thread(Thread* thread) {
1544 int status = thr_continue(thread->osthread()->thread_id());
1545 assert_status(status == 0, status, "thr_continue failed");
1546 }
1547
1548
1549 intx os::current_thread_id() {
1550 return (intx)thr_self();
1551 }
1552
1553 static pid_t _initial_pid = 0;
1554
1555 int os::current_process_id() {
1556 return (int)(_initial_pid ? _initial_pid : getpid());
1557 }
1558
1559 int os::allocate_thread_local_storage() {
1560 // %%% in Win32 this allocates a memory segment pointed to by a
1561 // register. Dan Stein can implement a similar feature in
1562 // Solaris. Alternatively, the VM can do the same thing
1563 // explicitly: malloc some storage and keep the pointer in a
1564 // register (which is part of the thread's context) (or keep it
1565 // in TLS).
1566 // %%% In current versions of Solaris, thr_self and TSD can
1567 // be accessed via short sequences of displaced indirections.
1568 // The value of thr_self is available as %g7(36).
1569 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1570 // assuming that the current thread already has a value bound to k.
1571 // It may be worth experimenting with such access patterns,
1572 // and later having the parameters formally exported from a Solaris
1573 // interface. I think, however, that it will be faster to
1574 // maintain the invariant that %g2 always contains the
1575 // JavaThread in Java code, and have stubs simply
1576 // treat %g2 as a caller-save register, preserving it in a %lN.
1577 thread_key_t tk;
1578 if (thr_keycreate( &tk, NULL ) )
1579 fatal1("os::allocate_thread_local_storage: thr_keycreate failed (%s)", strerror(errno));
1580 return int(tk);
1581 }
1582
1583 void os::free_thread_local_storage(int index) {
1584 // %%% don't think we need anything here
1585 // if ( pthread_key_delete((pthread_key_t) tk) )
1586 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1587 }
1588
1589 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1590 // small number - point is NO swap space available
1591 void os::thread_local_storage_at_put(int index, void* value) {
1592 // %%% this is used only in threadLocalStorage.cpp
1593 if (thr_setspecific((thread_key_t)index, value)) {
1594 if (errno == ENOMEM) {
1595 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space");
1596 } else {
1597 fatal1("os::thread_local_storage_at_put: thr_setspecific failed (%s)", strerror(errno));
1598 }
1599 } else {
1600 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1601 }
1602 }
1603
1604 // This function could be called before TLS is initialized, for example, when
1605 // VM receives an async signal or when VM causes a fatal error during
1606 // initialization. Return NULL if thr_getspecific() fails.
1607 void* os::thread_local_storage_at(int index) {
1608 // %%% this is used only in threadLocalStorage.cpp
1609 void* r = NULL;
1610 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1611 }
1612
1613
1614 const int NANOSECS_PER_MILLISECS = 1000000;
1615 // gethrtime can move backwards if read from one cpu and then a different cpu
1616 // getTimeNanos is guaranteed to not move backward on Solaris
1617 // local spinloop created as faster for a CAS on an int than
1618 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1619 // supported on sparc v8 or pre supports_cx8 intel boxes.
1620 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1621 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1622 inline hrtime_t oldgetTimeNanos() {
1623 int gotlock = LOCK_INVALID;
1624 hrtime_t newtime = gethrtime();
1625
1626 for (;;) {
1627 // grab lock for max_hrtime
1628 int curlock = max_hrtime_lock;
1629 if (curlock & LOCK_BUSY) continue;
1630 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1631 if (newtime > max_hrtime) {
1632 max_hrtime = newtime;
1633 } else {
1634 newtime = max_hrtime;
1635 }
1636 // release lock
1637 max_hrtime_lock = LOCK_FREE;
1638 return newtime;
1639 }
1640 }
1641 // gethrtime can move backwards if read from one cpu and then a different cpu
1642 // getTimeNanos is guaranteed to not move backward on Solaris
1643 inline hrtime_t getTimeNanos() {
1644 if (VM_Version::supports_cx8()) {
1645 const hrtime_t now = gethrtime();
1646 // Use atomic long load since 32-bit x86 uses 2 registers to keep long.
1647 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime);
1648 if (now <= prev) return prev; // same or retrograde time;
1649 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1650 assert(obsv >= prev, "invariant"); // Monotonicity
1651 // If the CAS succeeded then we're done and return "now".
1652 // If the CAS failed and the observed value "obs" is >= now then
1653 // we should return "obs". If the CAS failed and now > obs > prv then
1654 // some other thread raced this thread and installed a new value, in which case
1655 // we could either (a) retry the entire operation, (b) retry trying to install now
1656 // or (c) just return obs. We use (c). No loop is required although in some cases
1657 // we might discard a higher "now" value in deference to a slightly lower but freshly
1658 // installed obs value. That's entirely benign -- it admits no new orderings compared
1659 // to (a) or (b) -- and greatly reduces coherence traffic.
1660 // We might also condition (c) on the magnitude of the delta between obs and now.
1661 // Avoiding excessive CAS operations to hot RW locations is critical.
1662 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1663 return (prev == obsv) ? now : obsv ;
1664 } else {
1665 return oldgetTimeNanos();
1666 }
1667 }
1668
1669 // Time since start-up in seconds to a fine granularity.
1670 // Used by VMSelfDestructTimer and the MemProfiler.
1671 double os::elapsedTime() {
1672 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1673 }
1674
1675 jlong os::elapsed_counter() {
1676 return (jlong)(getTimeNanos() - first_hrtime);
1677 }
1678
1679 jlong os::elapsed_frequency() {
1680 return hrtime_hz;
1681 }
1682
1683 // Return the real, user, and system times in seconds from an
1684 // arbitrary fixed point in the past.
1685 bool os::getTimesSecs(double* process_real_time,
1686 double* process_user_time,
1687 double* process_system_time) {
1688 struct tms ticks;
1689 clock_t real_ticks = times(&ticks);
1690
1691 if (real_ticks == (clock_t) (-1)) {
1692 return false;
1693 } else {
1694 double ticks_per_second = (double) clock_tics_per_sec;
1695 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1696 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1697 // For consistency return the real time from getTimeNanos()
1698 // converted to seconds.
1699 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1700
1701 return true;
1702 }
1703 }
1704
1705 bool os::supports_vtime() { return true; }
1706
1707 bool os::enable_vtime() {
1708 int fd = open("/proc/self/ctl", O_WRONLY);
1709 if (fd == -1)
1710 return false;
1711
1712 long cmd[] = { PCSET, PR_MSACCT };
1713 int res = write(fd, cmd, sizeof(long) * 2);
1714 close(fd);
1715 if (res != sizeof(long) * 2)
1716 return false;
1717
1718 return true;
1719 }
1720
1721 bool os::vtime_enabled() {
1722 int fd = open("/proc/self/status", O_RDONLY);
1723 if (fd == -1)
1724 return false;
1725
1726 pstatus_t status;
1727 int res = read(fd, (void*) &status, sizeof(pstatus_t));
1728 close(fd);
1729 if (res != sizeof(pstatus_t))
1730 return false;
1731
1732 return status.pr_flags & PR_MSACCT;
1733 }
1734
1735 double os::elapsedVTime() {
1736 return (double)gethrvtime() / (double)hrtime_hz;
1737 }
1738
1739 // Used internally for comparisons only
1740 // getTimeMillis guaranteed to not move backwards on Solaris
1741 jlong getTimeMillis() {
1742 jlong nanotime = getTimeNanos();
1743 return (jlong)(nanotime / NANOSECS_PER_MILLISECS);
1744 }
1745
1746 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1747 jlong os::javaTimeMillis() {
1748 timeval t;
1749 if (gettimeofday( &t, NULL) == -1)
1750 fatal1("os::javaTimeMillis: gettimeofday (%s)", strerror(errno));
1751 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1752 }
1753
1754 jlong os::javaTimeNanos() {
1755 return (jlong)getTimeNanos();
1756 }
1757
1758 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1759 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1760 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1761 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1762 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1763 }
1764
1765 char * os::local_time_string(char *buf, size_t buflen) {
1766 struct tm t;
1767 time_t long_time;
1768 time(&long_time);
1769 localtime_r(&long_time, &t);
1770 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1771 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1772 t.tm_hour, t.tm_min, t.tm_sec);
1773 return buf;
1774 }
1775
1776 // Note: os::shutdown() might be called very early during initialization, or
1777 // called from signal handler. Before adding something to os::shutdown(), make
1778 // sure it is async-safe and can handle partially initialized VM.
1779 void os::shutdown() {
1780
1781 // allow PerfMemory to attempt cleanup of any persistent resources
1782 perfMemory_exit();
1783
1784 // needs to remove object in file system
1785 AttachListener::abort();
1786
1787 // flush buffered output, finish log files
1788 ostream_abort();
1789
1790 // Check for abort hook
1791 abort_hook_t abort_hook = Arguments::abort_hook();
1792 if (abort_hook != NULL) {
1793 abort_hook();
1794 }
1795 }
1796
1797 // Note: os::abort() might be called very early during initialization, or
1798 // called from signal handler. Before adding something to os::abort(), make
1799 // sure it is async-safe and can handle partially initialized VM.
1800 void os::abort(bool dump_core) {
1801 os::shutdown();
1802 if (dump_core) {
1803 #ifndef PRODUCT
1804 fdStream out(defaultStream::output_fd());
1805 out.print_raw("Current thread is ");
1806 char buf[16];
1807 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1808 out.print_raw_cr(buf);
1809 out.print_raw_cr("Dumping core ...");
1810 #endif
1811 ::abort(); // dump core (for debugging)
1812 }
1813
1814 ::exit(1);
1815 }
1816
1817 // Die immediately, no exit hook, no abort hook, no cleanup.
1818 void os::die() {
1819 _exit(-1);
1820 }
1821
1822 // unused
1823 void os::set_error_file(const char *logfile) {}
1824
1825 // DLL functions
1826
1827 const char* os::dll_file_extension() { return ".so"; }
1828
1829 const char* os::get_temp_directory() { return "/tmp/"; }
1830
1831 static bool file_exists(const char* filename) {
1832 struct stat statbuf;
1833 if (filename == NULL || strlen(filename) == 0) {
1834 return false;
1835 }
1836 return os::stat(filename, &statbuf) == 0;
1837 }
1838
1839 void os::dll_build_name(char* buffer, size_t buflen,
1840 const char* pname, const char* fname) {
1841 // Copied from libhpi
1842 const size_t pnamelen = pname ? strlen(pname) : 0;
1843
1844 // Quietly truncate on buffer overflow. Should be an error.
1845 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1846 *buffer = '\0';
1847 return;
1848 }
1849
1850 if (pnamelen == 0) {
1851 snprintf(buffer, buflen, "lib%s.so", fname);
1852 } else if (strchr(pname, *os::path_separator()) != NULL) {
1853 int n;
1854 char** pelements = split_path(pname, &n);
1855 for (int i = 0 ; i < n ; i++) {
1856 // really shouldn't be NULL but what the heck, check can't hurt
1857 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1858 continue; // skip the empty path values
1859 }
1860 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1861 if (file_exists(buffer)) {
1862 break;
1863 }
1864 }
1865 // release the storage
1866 for (int i = 0 ; i < n ; i++) {
1867 if (pelements[i] != NULL) {
1868 FREE_C_HEAP_ARRAY(char, pelements[i]);
1869 }
1870 }
1871 if (pelements != NULL) {
1872 FREE_C_HEAP_ARRAY(char*, pelements);
1873 }
1874 } else {
1875 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1876 }
1877 }
1878
1879 const char* os::get_current_directory(char *buf, int buflen) {
1880 return getcwd(buf, buflen);
1881 }
1882
1883 // check if addr is inside libjvm[_g].so
1884 bool os::address_is_in_vm(address addr) {
1885 static address libjvm_base_addr;
1886 Dl_info dlinfo;
1887
1888 if (libjvm_base_addr == NULL) {
1889 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1890 libjvm_base_addr = (address)dlinfo.dli_fbase;
1891 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1892 }
1893
1894 if (dladdr((void *)addr, &dlinfo)) {
1895 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1896 }
1897
1898 return false;
1899 }
1900
1901 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1902 static dladdr1_func_type dladdr1_func = NULL;
1903
1904 bool os::dll_address_to_function_name(address addr, char *buf,
1905 int buflen, int * offset) {
1906 Dl_info dlinfo;
1907
1908 // dladdr1_func was initialized in os::init()
1909 if (dladdr1_func){
1910 // yes, we have dladdr1
1911
1912 // Support for dladdr1 is checked at runtime; it may be
1913 // available even if the vm is built on a machine that does
1914 // not have dladdr1 support. Make sure there is a value for
1915 // RTLD_DL_SYMENT.
1916 #ifndef RTLD_DL_SYMENT
1917 #define RTLD_DL_SYMENT 1
1918 #endif
1919 Sym * info;
1920 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1921 RTLD_DL_SYMENT)) {
1922 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1923 if (offset) *offset = addr - (address)dlinfo.dli_saddr;
1924
1925 // check if the returned symbol really covers addr
1926 return ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr);
1927 } else {
1928 if (buf) buf[0] = '\0';
1929 if (offset) *offset = -1;
1930 return false;
1931 }
1932 } else {
1933 // no, only dladdr is available
1934 if(dladdr((void *)addr, &dlinfo)) {
1935 if (buf) jio_snprintf(buf, buflen, dlinfo.dli_sname);
1936 if (offset) *offset = addr - (address)dlinfo.dli_saddr;
1937 return true;
1938 } else {
1939 if (buf) buf[0] = '\0';
1940 if (offset) *offset = -1;
1941 return false;
1942 }
1943 }
1944 }
1945
1946 bool os::dll_address_to_library_name(address addr, char* buf,
1947 int buflen, int* offset) {
1948 Dl_info dlinfo;
1949
1950 if (dladdr((void*)addr, &dlinfo)){
1951 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1952 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
1953 return true;
1954 } else {
1955 if (buf) buf[0] = '\0';
1956 if (offset) *offset = -1;
1957 return false;
1958 }
1959 }
1960
1961 // Prints the names and full paths of all opened dynamic libraries
1962 // for current process
1963 void os::print_dll_info(outputStream * st) {
1964 Dl_info dli;
1965 void *handle;
1966 Link_map *map;
1967 Link_map *p;
1968
1969 st->print_cr("Dynamic libraries:"); st->flush();
1970
1971 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
1972 st->print_cr("Error: Cannot print dynamic libraries.");
1973 return;
1974 }
1975 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1976 if (handle == NULL) {
1977 st->print_cr("Error: Cannot print dynamic libraries.");
1978 return;
1979 }
1980 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1981 if (map == NULL) {
1982 st->print_cr("Error: Cannot print dynamic libraries.");
1983 return;
1984 }
1985
1986 while (map->l_prev != NULL)
1987 map = map->l_prev;
1988
1989 while (map != NULL) {
1990 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1991 map = map->l_next;
1992 }
1993
1994 dlclose(handle);
1995 }
1996
1997 // Loads .dll/.so and
1998 // in case of error it checks if .dll/.so was built for the
1999 // same architecture as Hotspot is running on
2000
2001 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2002 {
2003 void * result= ::dlopen(filename, RTLD_LAZY);
2004 if (result != NULL) {
2005 // Successful loading
2006 return result;
2007 }
2008
2009 Elf32_Ehdr elf_head;
2010
2011 // Read system error message into ebuf
2012 // It may or may not be overwritten below
2013 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2014 ebuf[ebuflen-1]='\0';
2015 int diag_msg_max_length=ebuflen-strlen(ebuf);
2016 char* diag_msg_buf=ebuf+strlen(ebuf);
2017
2018 if (diag_msg_max_length==0) {
2019 // No more space in ebuf for additional diagnostics message
2020 return NULL;
2021 }
2022
2023
2024 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2025
2026 if (file_descriptor < 0) {
2027 // Can't open library, report dlerror() message
2028 return NULL;
2029 }
2030
2031 bool failed_to_read_elf_head=
2032 (sizeof(elf_head)!=
2033 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2034
2035 ::close(file_descriptor);
2036 if (failed_to_read_elf_head) {
2037 // file i/o error - report dlerror() msg
2038 return NULL;
2039 }
2040
2041 typedef struct {
2042 Elf32_Half code; // Actual value as defined in elf.h
2043 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2044 char elf_class; // 32 or 64 bit
2045 char endianess; // MSB or LSB
2046 char* name; // String representation
2047 } arch_t;
2048
2049 static const arch_t arch_array[]={
2050 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2051 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2052 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2053 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2054 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2055 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2056 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2057 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2058 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}
2059 };
2060
2061 #if (defined IA32)
2062 static Elf32_Half running_arch_code=EM_386;
2063 #elif (defined AMD64)
2064 static Elf32_Half running_arch_code=EM_X86_64;
2065 #elif (defined IA64)
2066 static Elf32_Half running_arch_code=EM_IA_64;
2067 #elif (defined __sparc) && (defined _LP64)
2068 static Elf32_Half running_arch_code=EM_SPARCV9;
2069 #elif (defined __sparc) && (!defined _LP64)
2070 static Elf32_Half running_arch_code=EM_SPARC;
2071 #elif (defined __powerpc64__)
2072 static Elf32_Half running_arch_code=EM_PPC64;
2073 #elif (defined __powerpc__)
2074 static Elf32_Half running_arch_code=EM_PPC;
2075 #else
2076 #error Method os::dll_load requires that one of following is defined:\
2077 IA32, AMD64, IA64, __sparc, __powerpc__
2078 #endif
2079
2080 // Identify compatability class for VM's architecture and library's architecture
2081 // Obtain string descriptions for architectures
2082
2083 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2084 int running_arch_index=-1;
2085
2086 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2087 if (running_arch_code == arch_array[i].code) {
2088 running_arch_index = i;
2089 }
2090 if (lib_arch.code == arch_array[i].code) {
2091 lib_arch.compat_class = arch_array[i].compat_class;
2092 lib_arch.name = arch_array[i].name;
2093 }
2094 }
2095
2096 assert(running_arch_index != -1,
2097 "Didn't find running architecture code (running_arch_code) in arch_array");
2098 if (running_arch_index == -1) {
2099 // Even though running architecture detection failed
2100 // we may still continue with reporting dlerror() message
2101 return NULL;
2102 }
2103
2104 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2105 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2106 return NULL;
2107 }
2108
2109 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2110 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2111 return NULL;
2112 }
2113
2114 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2115 if ( lib_arch.name!=NULL ) {
2116 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2117 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2118 lib_arch.name, arch_array[running_arch_index].name);
2119 } else {
2120 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2121 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2122 lib_arch.code,
2123 arch_array[running_arch_index].name);
2124 }
2125 }
2126
2127 return NULL;
2128 }
2129
2130 void* os::dll_lookup(void* handle, const char* name) {
2131 return dlsym(handle, name);
2132 }
2133
2134
2135 bool _print_ascii_file(const char* filename, outputStream* st) {
2136 int fd = open(filename, O_RDONLY);
2137 if (fd == -1) {
2138 return false;
2139 }
2140
2141 char buf[32];
2142 int bytes;
2143 while ((bytes = read(fd, buf, sizeof(buf))) > 0) {
2144 st->print_raw(buf, bytes);
2145 }
2146
2147 close(fd);
2148
2149 return true;
2150 }
2151
2152 void os::print_os_info(outputStream* st) {
2153 st->print("OS:");
2154
2155 if (!_print_ascii_file("/etc/release", st)) {
2156 st->print("Solaris");
2157 }
2158 st->cr();
2159
2160 // kernel
2161 st->print("uname:");
2162 struct utsname name;
2163 uname(&name);
2164 st->print(name.sysname); st->print(" ");
2165 st->print(name.release); st->print(" ");
2166 st->print(name.version); st->print(" ");
2167 st->print(name.machine);
2168
2169 // libthread
2170 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)");
2171 else st->print(" (T1 libthread)");
2172 st->cr();
2173
2174 // rlimit
2175 st->print("rlimit:");
2176 struct rlimit rlim;
2177
2178 st->print(" STACK ");
2179 getrlimit(RLIMIT_STACK, &rlim);
2180 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2181 else st->print("%uk", rlim.rlim_cur >> 10);
2182
2183 st->print(", CORE ");
2184 getrlimit(RLIMIT_CORE, &rlim);
2185 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2186 else st->print("%uk", rlim.rlim_cur >> 10);
2187
2188 st->print(", NOFILE ");
2189 getrlimit(RLIMIT_NOFILE, &rlim);
2190 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2191 else st->print("%d", rlim.rlim_cur);
2192
2193 st->print(", AS ");
2194 getrlimit(RLIMIT_AS, &rlim);
2195 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2196 else st->print("%uk", rlim.rlim_cur >> 10);
2197 st->cr();
2198
2199 // load average
2200 st->print("load average:");
2201 double loadavg[3];
2202 os::loadavg(loadavg, 3);
2203 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
2204 st->cr();
2205 }
2206
2207
2208 static bool check_addr0(outputStream* st) {
2209 jboolean status = false;
2210 int fd = open("/proc/self/map",O_RDONLY);
2211 if (fd >= 0) {
2212 prmap_t p;
2213 while(read(fd, &p, sizeof(p)) > 0) {
2214 if (p.pr_vaddr == 0x0) {
2215 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2216 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2217 st->print("Access:");
2218 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2219 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2220 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2221 st->cr();
2222 status = true;
2223 }
2224 close(fd);
2225 }
2226 }
2227 return status;
2228 }
2229
2230 void os::print_memory_info(outputStream* st) {
2231 st->print("Memory:");
2232 st->print(" %dk page", os::vm_page_size()>>10);
2233 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2234 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2235 st->cr();
2236 (void) check_addr0(st);
2237 }
2238
2239 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2240 // but they're the same for all the solaris architectures that we support.
2241 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2242 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2243 "ILL_COPROC", "ILL_BADSTK" };
2244
2245 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2246 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2247 "FPE_FLTINV", "FPE_FLTSUB" };
2248
2249 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2250
2251 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2252
2253 void os::print_siginfo(outputStream* st, void* siginfo) {
2254 st->print("siginfo:");
2255
2256 const int buflen = 100;
2257 char buf[buflen];
2258 siginfo_t *si = (siginfo_t*)siginfo;
2259 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2260 char *err = strerror(si->si_errno);
2261 if (si->si_errno != 0 && err != NULL) {
2262 st->print("si_errno=%s", err);
2263 } else {
2264 st->print("si_errno=%d", si->si_errno);
2265 }
2266 const int c = si->si_code;
2267 assert(c > 0, "unexpected si_code");
2268 switch (si->si_signo) {
2269 case SIGILL:
2270 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2271 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2272 break;
2273 case SIGFPE:
2274 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2275 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2276 break;
2277 case SIGSEGV:
2278 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2279 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2280 break;
2281 case SIGBUS:
2282 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2283 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2284 break;
2285 default:
2286 st->print(", si_code=%d", si->si_code);
2287 // no si_addr
2288 }
2289
2290 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2291 UseSharedSpaces) {
2292 FileMapInfo* mapinfo = FileMapInfo::current_info();
2293 if (mapinfo->is_in_shared_space(si->si_addr)) {
2294 st->print("\n\nError accessing class data sharing archive." \
2295 " Mapped file inaccessible during execution, " \
2296 " possible disk/network problem.");
2297 }
2298 }
2299 st->cr();
2300 }
2301
2302 // Moved from whole group, because we need them here for diagnostic
2303 // prints.
2304 #define OLDMAXSIGNUM 32
2305 static int Maxsignum = 0;
2306 static int *ourSigFlags = NULL;
2307
2308 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2309
2310 int os::Solaris::get_our_sigflags(int sig) {
2311 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2312 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2313 return ourSigFlags[sig];
2314 }
2315
2316 void os::Solaris::set_our_sigflags(int sig, int flags) {
2317 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2318 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2319 ourSigFlags[sig] = flags;
2320 }
2321
2322
2323 static const char* get_signal_handler_name(address handler,
2324 char* buf, int buflen) {
2325 int offset;
2326 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2327 if (found) {
2328 // skip directory names
2329 const char *p1, *p2;
2330 p1 = buf;
2331 size_t len = strlen(os::file_separator());
2332 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2333 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2334 } else {
2335 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2336 }
2337 return buf;
2338 }
2339
2340 static void print_signal_handler(outputStream* st, int sig,
2341 char* buf, size_t buflen) {
2342 struct sigaction sa;
2343
2344 sigaction(sig, NULL, &sa);
2345
2346 st->print("%s: ", os::exception_name(sig, buf, buflen));
2347
2348 address handler = (sa.sa_flags & SA_SIGINFO)
2349 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2350 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2351
2352 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2353 st->print("SIG_DFL");
2354 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2355 st->print("SIG_IGN");
2356 } else {
2357 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2358 }
2359
2360 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2361
2362 address rh = VMError::get_resetted_sighandler(sig);
2363 // May be, handler was resetted by VMError?
2364 if(rh != NULL) {
2365 handler = rh;
2366 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2367 }
2368
2369 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2370
2371 // Check: is it our handler?
2372 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2373 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2374 // It is our signal handler
2375 // check for flags
2376 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2377 st->print(
2378 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2379 os::Solaris::get_our_sigflags(sig));
2380 }
2381 }
2382 st->cr();
2383 }
2384
2385 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2386 st->print_cr("Signal Handlers:");
2387 print_signal_handler(st, SIGSEGV, buf, buflen);
2388 print_signal_handler(st, SIGBUS , buf, buflen);
2389 print_signal_handler(st, SIGFPE , buf, buflen);
2390 print_signal_handler(st, SIGPIPE, buf, buflen);
2391 print_signal_handler(st, SIGXFSZ, buf, buflen);
2392 print_signal_handler(st, SIGILL , buf, buflen);
2393 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2394 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2395 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2396 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2397 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2398 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2399 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2400 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2401 }
2402
2403 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2404
2405 // Find the full path to the current module, libjvm.so or libjvm_g.so
2406 void os::jvm_path(char *buf, jint buflen) {
2407 // Error checking.
2408 if (buflen < MAXPATHLEN) {
2409 assert(false, "must use a large-enough buffer");
2410 buf[0] = '\0';
2411 return;
2412 }
2413 // Lazy resolve the path to current module.
2414 if (saved_jvm_path[0] != 0) {
2415 strcpy(buf, saved_jvm_path);
2416 return;
2417 }
2418
2419 Dl_info dlinfo;
2420 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2421 assert(ret != 0, "cannot locate libjvm");
2422 realpath((char *)dlinfo.dli_fname, buf);
2423
2424 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) {
2425 // Support for the gamma launcher. Typical value for buf is
2426 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2427 // the right place in the string, then assume we are installed in a JDK and
2428 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2429 // up the path so it looks like libjvm.so is installed there (append a
2430 // fake suffix hotspot/libjvm.so).
2431 const char *p = buf + strlen(buf) - 1;
2432 for (int count = 0; p > buf && count < 5; ++count) {
2433 for (--p; p > buf && *p != '/'; --p)
2434 /* empty */ ;
2435 }
2436
2437 if (strncmp(p, "/jre/lib/", 9) != 0) {
2438 // Look for JAVA_HOME in the environment.
2439 char* java_home_var = ::getenv("JAVA_HOME");
2440 if (java_home_var != NULL && java_home_var[0] != 0) {
2441 char cpu_arch[12];
2442 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2443 #ifdef _LP64
2444 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2445 if (strcmp(cpu_arch, "sparc") == 0) {
2446 strcat(cpu_arch, "v9");
2447 } else if (strcmp(cpu_arch, "i386") == 0) {
2448 strcpy(cpu_arch, "amd64");
2449 }
2450 #endif
2451 // Check the current module name "libjvm.so" or "libjvm_g.so".
2452 p = strrchr(buf, '/');
2453 assert(strstr(p, "/libjvm") == p, "invalid library name");
2454 p = strstr(p, "_g") ? "_g" : "";
2455
2456 realpath(java_home_var, buf);
2457 sprintf(buf + strlen(buf), "/jre/lib/%s", cpu_arch);
2458 if (0 == access(buf, F_OK)) {
2459 // Use current module name "libjvm[_g].so" instead of
2460 // "libjvm"debug_only("_g")".so" since for fastdebug version
2461 // we should have "libjvm.so" but debug_only("_g") adds "_g"!
2462 // It is used when we are choosing the HPI library's name
2463 // "libhpi[_g].so" in hpi::initialize_get_interface().
2464 sprintf(buf + strlen(buf), "/hotspot/libjvm%s.so", p);
2465 } else {
2466 // Go back to path of .so
2467 realpath((char *)dlinfo.dli_fname, buf);
2468 }
2469 }
2470 }
2471 }
2472
2473 strcpy(saved_jvm_path, buf);
2474 }
2475
2476
2477 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2478 // no prefix required, not even "_"
2479 }
2480
2481
2482 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2483 // no suffix required
2484 }
2485
2486
2487 // sun.misc.Signal
2488
2489 extern "C" {
2490 static void UserHandler(int sig, void *siginfo, void *context) {
2491 // Ctrl-C is pressed during error reporting, likely because the error
2492 // handler fails to abort. Let VM die immediately.
2493 if (sig == SIGINT && is_error_reported()) {
2494 os::die();
2495 }
2496
2497 os::signal_notify(sig);
2498 // We do not need to reinstate the signal handler each time...
2499 }
2500 }
2501
2502 void* os::user_handler() {
2503 return CAST_FROM_FN_PTR(void*, UserHandler);
2504 }
2505
2506 extern "C" {
2507 typedef void (*sa_handler_t)(int);
2508 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2509 }
2510
2511 void* os::signal(int signal_number, void* handler) {
2512 struct sigaction sigAct, oldSigAct;
2513 sigfillset(&(sigAct.sa_mask));
2514 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2515 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2516
2517 if (sigaction(signal_number, &sigAct, &oldSigAct))
2518 // -1 means registration failed
2519 return (void *)-1;
2520
2521 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2522 }
2523
2524 void os::signal_raise(int signal_number) {
2525 raise(signal_number);
2526 }
2527
2528 /*
2529 * The following code is moved from os.cpp for making this
2530 * code platform specific, which it is by its very nature.
2531 */
2532
2533 // a counter for each possible signal value
2534 static int Sigexit = 0;
2535 static int Maxlibjsigsigs;
2536 static jint *pending_signals = NULL;
2537 static int *preinstalled_sigs = NULL;
2538 static struct sigaction *chainedsigactions = NULL;
2539 static sema_t sig_sem;
2540 typedef int (*version_getting_t)();
2541 version_getting_t os::Solaris::get_libjsig_version = NULL;
2542 static int libjsigversion = NULL;
2543
2544 int os::sigexitnum_pd() {
2545 assert(Sigexit > 0, "signal memory not yet initialized");
2546 return Sigexit;
2547 }
2548
2549 void os::Solaris::init_signal_mem() {
2550 // Initialize signal structures
2551 Maxsignum = SIGRTMAX;
2552 Sigexit = Maxsignum+1;
2553 assert(Maxsignum >0, "Unable to obtain max signal number");
2554
2555 Maxlibjsigsigs = Maxsignum;
2556
2557 // pending_signals has one int per signal
2558 // The additional signal is for SIGEXIT - exit signal to signal_thread
2559 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1));
2560 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2561
2562 if (UseSignalChaining) {
2563 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2564 * (Maxsignum + 1));
2565 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2566 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1));
2567 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2568 }
2569 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ));
2570 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2571 }
2572
2573 void os::signal_init_pd() {
2574 int ret;
2575
2576 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2577 assert(ret == 0, "sema_init() failed");
2578 }
2579
2580 void os::signal_notify(int signal_number) {
2581 int ret;
2582
2583 Atomic::inc(&pending_signals[signal_number]);
2584 ret = ::sema_post(&sig_sem);
2585 assert(ret == 0, "sema_post() failed");
2586 }
2587
2588 static int check_pending_signals(bool wait_for_signal) {
2589 int ret;
2590 while (true) {
2591 for (int i = 0; i < Sigexit + 1; i++) {
2592 jint n = pending_signals[i];
2593 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2594 return i;
2595 }
2596 }
2597 if (!wait_for_signal) {
2598 return -1;
2599 }
2600 JavaThread *thread = JavaThread::current();
2601 ThreadBlockInVM tbivm(thread);
2602
2603 bool threadIsSuspended;
2604 do {
2605 thread->set_suspend_equivalent();
2606 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2607 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2608 ;
2609 assert(ret == 0, "sema_wait() failed");
2610
2611 // were we externally suspended while we were waiting?
2612 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2613 if (threadIsSuspended) {
2614 //
2615 // The semaphore has been incremented, but while we were waiting
2616 // another thread suspended us. We don't want to continue running
2617 // while suspended because that would surprise the thread that
2618 // suspended us.
2619 //
2620 ret = ::sema_post(&sig_sem);
2621 assert(ret == 0, "sema_post() failed");
2622
2623 thread->java_suspend_self();
2624 }
2625 } while (threadIsSuspended);
2626 }
2627 }
2628
2629 int os::signal_lookup() {
2630 return check_pending_signals(false);
2631 }
2632
2633 int os::signal_wait() {
2634 return check_pending_signals(true);
2635 }
2636
2637 ////////////////////////////////////////////////////////////////////////////////
2638 // Virtual Memory
2639
2640 static int page_size = -1;
2641
2642 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2643 // clear this var if support is not available.
2644 static bool has_map_align = true;
2645
2646 int os::vm_page_size() {
2647 assert(page_size != -1, "must call os::init");
2648 return page_size;
2649 }
2650
2651 // Solaris allocates memory by pages.
2652 int os::vm_allocation_granularity() {
2653 assert(page_size != -1, "must call os::init");
2654 return page_size;
2655 }
2656
2657 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2658 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2659 size_t size = bytes;
2660 return
2661 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2662 }
2663
2664 bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2665 bool exec) {
2666 if (commit_memory(addr, bytes, exec)) {
2667 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2668 // If the large page size has been set and the VM
2669 // is using large pages, use the large page size
2670 // if it is smaller than the alignment hint. This is
2671 // a case where the VM wants to use a larger alignment size
2672 // for its own reasons but still want to use large pages
2673 // (which is what matters to setting the mpss range.
2674 size_t page_size = 0;
2675 if (large_page_size() < alignment_hint) {
2676 assert(UseLargePages, "Expected to be here for large page use only");
2677 page_size = large_page_size();
2678 } else {
2679 // If the alignment hint is less than the large page
2680 // size, the VM wants a particular alignment (thus the hint)
2681 // for internal reasons. Try to set the mpss range using
2682 // the alignment_hint.
2683 page_size = alignment_hint;
2684 }
2685 // Since this is a hint, ignore any failures.
2686 (void)Solaris::set_mpss_range(addr, bytes, page_size);
2687 }
2688 return true;
2689 }
2690 return false;
2691 }
2692
2693 // Uncommit the pages in a specified region.
2694 void os::free_memory(char* addr, size_t bytes) {
2695 if (madvise(addr, bytes, MADV_FREE) < 0) {
2696 debug_only(warning("MADV_FREE failed."));
2697 return;
2698 }
2699 }
2700
2701 // Change the page size in a given range.
2702 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2703 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2704 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2705 Solaris::set_mpss_range(addr, bytes, alignment_hint);
2706 }
2707
2708 // Tell the OS to make the range local to the first-touching LWP
2709 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2710 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2711 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2712 debug_only(warning("MADV_ACCESS_LWP failed."));
2713 }
2714 }
2715
2716 // Tell the OS that this range would be accessed from different LWPs.
2717 void os::numa_make_global(char *addr, size_t bytes) {
2718 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2719 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2720 debug_only(warning("MADV_ACCESS_MANY failed."));
2721 }
2722 }
2723
2724 // Get the number of the locality groups.
2725 size_t os::numa_get_groups_num() {
2726 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2727 return n != -1 ? n : 1;
2728 }
2729
2730 // Get a list of leaf locality groups. A leaf lgroup is group that
2731 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2732 // board. An LWP is assigned to one of these groups upon creation.
2733 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2734 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2735 ids[0] = 0;
2736 return 1;
2737 }
2738 int result_size = 0, top = 1, bottom = 0, cur = 0;
2739 for (int k = 0; k < size; k++) {
2740 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2741 (Solaris::lgrp_id_t*)&ids[top], size - top);
2742 if (r == -1) {
2743 ids[0] = 0;
2744 return 1;
2745 }
2746 if (!r) {
2747 // That's a leaf node.
2748 assert (bottom <= cur, "Sanity check");
2749 // Check if the node has memory
2750 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2751 NULL, 0, LGRP_RSRC_MEM) > 0) {
2752 ids[bottom++] = ids[cur];
2753 }
2754 }
2755 top += r;
2756 cur++;
2757 }
2758 if (bottom == 0) {
2759 // Handle a situation, when the OS reports no memory available.
2760 // Assume UMA architecture.
2761 ids[0] = 0;
2762 return 1;
2763 }
2764 return bottom;
2765 }
2766
2767 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2768 bool os::numa_topology_changed() {
2769 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2770 if (is_stale != -1 && is_stale) {
2771 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2772 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2773 assert(c != 0, "Failure to initialize LGRP API");
2774 Solaris::set_lgrp_cookie(c);
2775 return true;
2776 }
2777 return false;
2778 }
2779
2780 // Get the group id of the current LWP.
2781 int os::numa_get_group_id() {
2782 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2783 if (lgrp_id == -1) {
2784 return 0;
2785 }
2786 const int size = os::numa_get_groups_num();
2787 int *ids = (int*)alloca(size * sizeof(int));
2788
2789 // Get the ids of all lgroups with memory; r is the count.
2790 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2791 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2792 if (r <= 0) {
2793 return 0;
2794 }
2795 return ids[os::random() % r];
2796 }
2797
2798 // Request information about the page.
2799 bool os::get_page_info(char *start, page_info* info) {
2800 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2801 uint64_t addr = (uintptr_t)start;
2802 uint64_t outdata[2];
2803 uint_t validity = 0;
2804
2805 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2806 return false;
2807 }
2808
2809 info->size = 0;
2810 info->lgrp_id = -1;
2811
2812 if ((validity & 1) != 0) {
2813 if ((validity & 2) != 0) {
2814 info->lgrp_id = outdata[0];
2815 }
2816 if ((validity & 4) != 0) {
2817 info->size = outdata[1];
2818 }
2819 return true;
2820 }
2821 return false;
2822 }
2823
2824 // Scan the pages from start to end until a page different than
2825 // the one described in the info parameter is encountered.
2826 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2827 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2828 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2829 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2830 uint_t validity[MAX_MEMINFO_CNT];
2831
2832 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2833 uint64_t p = (uint64_t)start;
2834 while (p < (uint64_t)end) {
2835 addrs[0] = p;
2836 size_t addrs_count = 1;
2837 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) {
2838 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2839 addrs_count++;
2840 }
2841
2842 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2843 return NULL;
2844 }
2845
2846 size_t i = 0;
2847 for (; i < addrs_count; i++) {
2848 if ((validity[i] & 1) != 0) {
2849 if ((validity[i] & 4) != 0) {
2850 if (outdata[types * i + 1] != page_expected->size) {
2851 break;
2852 }
2853 } else
2854 if (page_expected->size != 0) {
2855 break;
2856 }
2857
2858 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2859 if (outdata[types * i] != page_expected->lgrp_id) {
2860 break;
2861 }
2862 }
2863 } else {
2864 return NULL;
2865 }
2866 }
2867
2868 if (i != addrs_count) {
2869 if ((validity[i] & 2) != 0) {
2870 page_found->lgrp_id = outdata[types * i];
2871 } else {
2872 page_found->lgrp_id = -1;
2873 }
2874 if ((validity[i] & 4) != 0) {
2875 page_found->size = outdata[types * i + 1];
2876 } else {
2877 page_found->size = 0;
2878 }
2879 return (char*)addrs[i];
2880 }
2881
2882 p = addrs[addrs_count - 1] + page_size;
2883 }
2884 return end;
2885 }
2886
2887 bool os::uncommit_memory(char* addr, size_t bytes) {
2888 size_t size = bytes;
2889 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2890 // uncommitted page. Otherwise, the read/write might succeed if we
2891 // have enough swap space to back the physical page.
2892 return
2893 NULL != Solaris::mmap_chunk(addr, size,
2894 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2895 PROT_NONE);
2896 }
2897
2898 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2899 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2900
2901 if (b == MAP_FAILED) {
2902 return NULL;
2903 }
2904 return b;
2905 }
2906
2907 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2908 char* addr = requested_addr;
2909 int flags = MAP_PRIVATE | MAP_NORESERVE;
2910
2911 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2912
2913 if (fixed) {
2914 flags |= MAP_FIXED;
2915 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2916 flags |= MAP_ALIGN;
2917 addr = (char*) alignment_hint;
2918 }
2919
2920 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2921 // uncommitted page. Otherwise, the read/write might succeed if we
2922 // have enough swap space to back the physical page.
2923 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2924 }
2925
2926 char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2927 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2928
2929 guarantee(requested_addr == NULL || requested_addr == addr,
2930 "OS failed to return requested mmap address.");
2931 return addr;
2932 }
2933
2934 // Reserve memory at an arbitrary address, only if that area is
2935 // available (and not reserved for something else).
2936
2937 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2938 const int max_tries = 10;
2939 char* base[max_tries];
2940 size_t size[max_tries];
2941
2942 // Solaris adds a gap between mmap'ed regions. The size of the gap
2943 // is dependent on the requested size and the MMU. Our initial gap
2944 // value here is just a guess and will be corrected later.
2945 bool had_top_overlap = false;
2946 bool have_adjusted_gap = false;
2947 size_t gap = 0x400000;
2948
2949 // Assert only that the size is a multiple of the page size, since
2950 // that's all that mmap requires, and since that's all we really know
2951 // about at this low abstraction level. If we need higher alignment,
2952 // we can either pass an alignment to this method or verify alignment
2953 // in one of the methods further up the call chain. See bug 5044738.
2954 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2955
2956 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2957 // Give it a try, if the kernel honors the hint we can return immediately.
2958 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2959 volatile int err = errno;
2960 if (addr == requested_addr) {
2961 return addr;
2962 } else if (addr != NULL) {
2963 unmap_memory(addr, bytes);
2964 }
2965
2966 if (PrintMiscellaneous && Verbose) {
2967 char buf[256];
2968 buf[0] = '\0';
2969 if (addr == NULL) {
2970 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2971 }
2972 warning("attempt_reserve_memory_at: couldn't reserve %d bytes at "
2973 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2974 "%s", bytes, requested_addr, addr, buf);
2975 }
2976
2977 // Address hint method didn't work. Fall back to the old method.
2978 // In theory, once SNV becomes our oldest supported platform, this
2979 // code will no longer be needed.
2980 //
2981 // Repeatedly allocate blocks until the block is allocated at the
2982 // right spot. Give up after max_tries.
2983 int i;
2984 for (i = 0; i < max_tries; ++i) {
2985 base[i] = reserve_memory(bytes);
2986
2987 if (base[i] != NULL) {
2988 // Is this the block we wanted?
2989 if (base[i] == requested_addr) {
2990 size[i] = bytes;
2991 break;
2992 }
2993
2994 // check that the gap value is right
2995 if (had_top_overlap && !have_adjusted_gap) {
2996 size_t actual_gap = base[i-1] - base[i] - bytes;
2997 if (gap != actual_gap) {
2998 // adjust the gap value and retry the last 2 allocations
2999 assert(i > 0, "gap adjustment code problem");
3000 have_adjusted_gap = true; // adjust the gap only once, just in case
3001 gap = actual_gap;
3002 if (PrintMiscellaneous && Verbose) {
3003 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3004 }
3005 unmap_memory(base[i], bytes);
3006 unmap_memory(base[i-1], size[i-1]);
3007 i-=2;
3008 continue;
3009 }
3010 }
3011
3012 // Does this overlap the block we wanted? Give back the overlapped
3013 // parts and try again.
3014 //
3015 // There is still a bug in this code: if top_overlap == bytes,
3016 // the overlap is offset from requested region by the value of gap.
3017 // In this case giving back the overlapped part will not work,
3018 // because we'll give back the entire block at base[i] and
3019 // therefore the subsequent allocation will not generate a new gap.
3020 // This could be fixed with a new algorithm that used larger
3021 // or variable size chunks to find the requested region -
3022 // but such a change would introduce additional complications.
3023 // It's rare enough that the planets align for this bug,
3024 // so we'll just wait for a fix for 6204603/5003415 which
3025 // will provide a mmap flag to allow us to avoid this business.
3026
3027 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3028 if (top_overlap >= 0 && top_overlap < bytes) {
3029 had_top_overlap = true;
3030 unmap_memory(base[i], top_overlap);
3031 base[i] += top_overlap;
3032 size[i] = bytes - top_overlap;
3033 } else {
3034 size_t bottom_overlap = base[i] + bytes - requested_addr;
3035 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3036 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3037 warning("attempt_reserve_memory_at: possible alignment bug");
3038 }
3039 unmap_memory(requested_addr, bottom_overlap);
3040 size[i] = bytes - bottom_overlap;
3041 } else {
3042 size[i] = bytes;
3043 }
3044 }
3045 }
3046 }
3047
3048 // Give back the unused reserved pieces.
3049
3050 for (int j = 0; j < i; ++j) {
3051 if (base[j] != NULL) {
3052 unmap_memory(base[j], size[j]);
3053 }
3054 }
3055
3056 return (i < max_tries) ? requested_addr : NULL;
3057 }
3058
3059 bool os::release_memory(char* addr, size_t bytes) {
3060 size_t size = bytes;
3061 return munmap(addr, size) == 0;
3062 }
3063
3064 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3065 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3066 "addr must be page aligned");
3067 int retVal = mprotect(addr, bytes, prot);
3068 return retVal == 0;
3069 }
3070
3071 // Protect memory (Used to pass readonly pages through
3072 // JNI GetArray<type>Elements with empty arrays.)
3073 // Also, used for serialization page and for compressed oops null pointer
3074 // checking.
3075 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3076 bool is_committed) {
3077 unsigned int p = 0;
3078 switch (prot) {
3079 case MEM_PROT_NONE: p = PROT_NONE; break;
3080 case MEM_PROT_READ: p = PROT_READ; break;
3081 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3082 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3083 default:
3084 ShouldNotReachHere();
3085 }
3086 // is_committed is unused.
3087 return solaris_mprotect(addr, bytes, p);
3088 }
3089
3090 // guard_memory and unguard_memory only happens within stack guard pages.
3091 // Since ISM pertains only to the heap, guard and unguard memory should not
3092 /// happen with an ISM region.
3093 bool os::guard_memory(char* addr, size_t bytes) {
3094 return solaris_mprotect(addr, bytes, PROT_NONE);
3095 }
3096
3097 bool os::unguard_memory(char* addr, size_t bytes) {
3098 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3099 }
3100
3101 // Large page support
3102
3103 // UseLargePages is the master flag to enable/disable large page memory.
3104 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3105 // effects can be described in the following table:
3106 //
3107 // UseLargePages UseMPSS UseISM
3108 // false * * => UseLargePages is the master switch, turning
3109 // it off will turn off both UseMPSS and
3110 // UseISM. VM will not use large page memory
3111 // regardless the settings of UseMPSS/UseISM.
3112 // true false false => Unless future Solaris provides other
3113 // mechanism to use large page memory, this
3114 // combination is equivalent to -UseLargePages,
3115 // VM will not use large page memory
3116 // true true false => JVM will use MPSS for large page memory.
3117 // This is the default behavior.
3118 // true false true => JVM will use ISM for large page memory.
3119 // true true true => JVM will use ISM if it is available.
3120 // Otherwise, JVM will fall back to MPSS.
3121 // Becaues ISM is now available on all
3122 // supported Solaris versions, this combination
3123 // is equivalent to +UseISM -UseMPSS.
3124
3125 typedef int (*getpagesizes_func_type) (size_t[], int);
3126 static size_t _large_page_size = 0;
3127
3128 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3129 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3130 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3131 // can support multiple page sizes.
3132
3133 // Don't bother to probe page size because getpagesizes() comes with MPSS.
3134 // ISM is only recommended on old Solaris where there is no MPSS support.
3135 // Simply choose a conservative value as default.
3136 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3137 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M);
3138
3139 // ISM is available on all supported Solaris versions
3140 return true;
3141 }
3142
3143 // Insertion sort for small arrays (descending order).
3144 static void insertion_sort_descending(size_t* array, int len) {
3145 for (int i = 0; i < len; i++) {
3146 size_t val = array[i];
3147 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3148 size_t tmp = array[key];
3149 array[key] = array[key - 1];
3150 array[key - 1] = tmp;
3151 }
3152 }
3153 }
3154
3155 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3156 getpagesizes_func_type getpagesizes_func =
3157 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes"));
3158 if (getpagesizes_func == NULL) {
3159 if (warn) {
3160 warning("MPSS is not supported by the operating system.");
3161 }
3162 return false;
3163 }
3164
3165 const unsigned int usable_count = VM_Version::page_size_count();
3166 if (usable_count == 1) {
3167 return false;
3168 }
3169
3170 // Fill the array of page sizes.
3171 int n = getpagesizes_func(_page_sizes, page_sizes_max);
3172 assert(n > 0, "Solaris bug?");
3173 if (n == page_sizes_max) {
3174 // Add a sentinel value (necessary only if the array was completely filled
3175 // since it is static (zeroed at initialization)).
3176 _page_sizes[--n] = 0;
3177 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3178 }
3179 assert(_page_sizes[n] == 0, "missing sentinel");
3180
3181 if (n == 1) return false; // Only one page size available.
3182
3183 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3184 // select up to usable_count elements. First sort the array, find the first
3185 // acceptable value, then copy the usable sizes to the top of the array and
3186 // trim the rest. Make sure to include the default page size :-).
3187 //
3188 // A better policy could get rid of the 4M limit by taking the sizes of the
3189 // important VM memory regions (java heap and possibly the code cache) into
3190 // account.
3191 insertion_sort_descending(_page_sizes, n);
3192 const size_t size_limit =
3193 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3194 int beg;
3195 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3196 const int end = MIN2((int)usable_count, n) - 1;
3197 for (int cur = 0; cur < end; ++cur, ++beg) {
3198 _page_sizes[cur] = _page_sizes[beg];
3199 }
3200 _page_sizes[end] = vm_page_size();
3201 _page_sizes[end + 1] = 0;
3202
3203 if (_page_sizes[end] > _page_sizes[end - 1]) {
3204 // Default page size is not the smallest; sort again.
3205 insertion_sort_descending(_page_sizes, end + 1);
3206 }
3207 *page_size = _page_sizes[0];
3208
3209 return true;
3210 }
3211
3212 bool os::large_page_init() {
3213 if (!UseLargePages) {
3214 UseISM = false;
3215 UseMPSS = false;
3216 return false;
3217 }
3218
3219 // print a warning if any large page related flag is specified on command line
3220 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3221 !FLAG_IS_DEFAULT(UseISM) ||
3222 !FLAG_IS_DEFAULT(UseMPSS) ||
3223 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3224 UseISM = UseISM &&
3225 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3226 if (UseISM) {
3227 // ISM disables MPSS to be compatible with old JDK behavior
3228 UseMPSS = false;
3229 _page_sizes[0] = _large_page_size;
3230 _page_sizes[1] = vm_page_size();
3231 }
3232
3233 UseMPSS = UseMPSS &&
3234 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3235
3236 UseLargePages = UseISM || UseMPSS;
3237 return UseLargePages;
3238 }
3239
3240 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3241 // Signal to OS that we want large pages for addresses
3242 // from addr, addr + bytes
3243 struct memcntl_mha mpss_struct;
3244 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3245 mpss_struct.mha_pagesize = align;
3246 mpss_struct.mha_flags = 0;
3247 if (memcntl(start, bytes, MC_HAT_ADVISE,
3248 (caddr_t) &mpss_struct, 0, 0) < 0) {
3249 debug_only(warning("Attempt to use MPSS failed."));
3250 return false;
3251 }
3252 return true;
3253 }
3254
3255 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3256 // "exec" is passed in but not used. Creating the shared image for
3257 // the code cache doesn't have an SHM_X executable permission to check.
3258 assert(UseLargePages && UseISM, "only for ISM large pages");
3259
3260 size_t size = bytes;
3261 char* retAddr = NULL;
3262 int shmid;
3263 key_t ismKey;
3264
3265 bool warn_on_failure = UseISM &&
3266 (!FLAG_IS_DEFAULT(UseLargePages) ||
3267 !FLAG_IS_DEFAULT(UseISM) ||
3268 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3269 );
3270 char msg[128];
3271
3272 ismKey = IPC_PRIVATE;
3273
3274 // Create a large shared memory region to attach to based on size.
3275 // Currently, size is the total size of the heap
3276 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3277 if (shmid == -1){
3278 if (warn_on_failure) {
3279 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3280 warning(msg);
3281 }
3282 return NULL;
3283 }
3284
3285 // Attach to the region
3286 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3287 int err = errno;
3288
3289 // Remove shmid. If shmat() is successful, the actual shared memory segment
3290 // will be deleted when it's detached by shmdt() or when the process
3291 // terminates. If shmat() is not successful this will remove the shared
3292 // segment immediately.
3293 shmctl(shmid, IPC_RMID, NULL);
3294
3295 if (retAddr == (char *) -1) {
3296 if (warn_on_failure) {
3297 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3298 warning(msg);
3299 }
3300 return NULL;
3301 }
3302
3303 return retAddr;
3304 }
3305
3306 bool os::release_memory_special(char* base, size_t bytes) {
3307 // detaching the SHM segment will also delete it, see reserve_memory_special()
3308 int rslt = shmdt(base);
3309 return rslt == 0;
3310 }
3311
3312 size_t os::large_page_size() {
3313 return _large_page_size;
3314 }
3315
3316 // MPSS allows application to commit large page memory on demand; with ISM
3317 // the entire memory region must be allocated as shared memory.
3318 bool os::can_commit_large_page_memory() {
3319 return UseISM ? false : true;
3320 }
3321
3322 bool os::can_execute_large_page_memory() {
3323 return UseISM ? false : true;
3324 }
3325
3326 static int os_sleep(jlong millis, bool interruptible) {
3327 const jlong limit = INT_MAX;
3328 jlong prevtime;
3329 int res;
3330
3331 while (millis > limit) {
3332 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3333 return res;
3334 millis -= limit;
3335 }
3336
3337 // Restart interrupted polls with new parameters until the proper delay
3338 // has been completed.
3339
3340 prevtime = getTimeMillis();
3341
3342 while (millis > 0) {
3343 jlong newtime;
3344
3345 if (!interruptible) {
3346 // Following assert fails for os::yield_all:
3347 // assert(!thread->is_Java_thread(), "must not be java thread");
3348 res = poll(NULL, 0, millis);
3349 } else {
3350 JavaThread *jt = JavaThread::current();
3351
3352 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3353 os::Solaris::clear_interrupted);
3354 }
3355
3356 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3357 // thread.Interrupt.
3358
3359 if((res == OS_ERR) && (errno == EINTR)) {
3360 newtime = getTimeMillis();
3361 assert(newtime >= prevtime, "time moving backwards");
3362 /* Doing prevtime and newtime in microseconds doesn't help precision,
3363 and trying to round up to avoid lost milliseconds can result in a
3364 too-short delay. */
3365 millis -= newtime - prevtime;
3366 if(millis <= 0)
3367 return OS_OK;
3368 prevtime = newtime;
3369 } else
3370 return res;
3371 }
3372
3373 return OS_OK;
3374 }
3375
3376 // Read calls from inside the vm need to perform state transitions
3377 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3378 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3379 }
3380
3381 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3382 assert(thread == Thread::current(), "thread consistency check");
3383
3384 // TODO-FIXME: this should be removed.
3385 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3386 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3387 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3388 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3389 // is fooled into believing that the system is making progress. In the code below we block the
3390 // the watcher thread while safepoint is in progress so that it would not appear as though the
3391 // system is making progress.
3392 if (!Solaris::T2_libthread() &&
3393 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3394 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3395 // the entire safepoint, the watcher thread will line up here during the safepoint.
3396 Threads_lock->lock_without_safepoint_check();
3397 Threads_lock->unlock();
3398 }
3399
3400 if (thread->is_Java_thread()) {
3401 // This is a JavaThread so we honor the _thread_blocked protocol
3402 // even for sleeps of 0 milliseconds. This was originally done
3403 // as a workaround for bug 4338139. However, now we also do it
3404 // to honor the suspend-equivalent protocol.
3405
3406 JavaThread *jt = (JavaThread *) thread;
3407 ThreadBlockInVM tbivm(jt);
3408
3409 jt->set_suspend_equivalent();
3410 // cleared by handle_special_suspend_equivalent_condition() or
3411 // java_suspend_self() via check_and_wait_while_suspended()
3412
3413 int ret_code;
3414 if (millis <= 0) {
3415 thr_yield();
3416 ret_code = 0;
3417 } else {
3418 // The original sleep() implementation did not create an
3419 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3420 // I'm preserving that decision for now.
3421 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3422
3423 ret_code = os_sleep(millis, interruptible);
3424 }
3425
3426 // were we externally suspended while we were waiting?
3427 jt->check_and_wait_while_suspended();
3428
3429 return ret_code;
3430 }
3431
3432 // non-JavaThread from this point on:
3433
3434 if (millis <= 0) {
3435 thr_yield();
3436 return 0;
3437 }
3438
3439 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3440
3441 return os_sleep(millis, interruptible);
3442 }
3443
3444 int os::naked_sleep() {
3445 // %% make the sleep time an integer flag. for now use 1 millisec.
3446 return os_sleep(1, false);
3447 }
3448
3449 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3450 void os::infinite_sleep() {
3451 while (true) { // sleep forever ...
3452 ::sleep(100); // ... 100 seconds at a time
3453 }
3454 }
3455
3456 // Used to convert frequent JVM_Yield() to nops
3457 bool os::dont_yield() {
3458 if (DontYieldALot) {
3459 static hrtime_t last_time = 0;
3460 hrtime_t diff = getTimeNanos() - last_time;
3461
3462 if (diff < DontYieldALotInterval * 1000000)
3463 return true;
3464
3465 last_time += diff;
3466
3467 return false;
3468 }
3469 else {
3470 return false;
3471 }
3472 }
3473
3474 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3475 // the linux and win32 implementations do not. This should be checked.
3476
3477 void os::yield() {
3478 // Yields to all threads with same or greater priority
3479 os::sleep(Thread::current(), 0, false);
3480 }
3481
3482 // Note that yield semantics are defined by the scheduling class to which
3483 // the thread currently belongs. Typically, yield will _not yield to
3484 // other equal or higher priority threads that reside on the dispatch queues
3485 // of other CPUs.
3486
3487 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3488
3489
3490 // On Solaris we found that yield_all doesn't always yield to all other threads.
3491 // There have been cases where there is a thread ready to execute but it doesn't
3492 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3493 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3494 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3495 // number of times yield_all is called in the one loop and increase the sleep
3496 // time after 8 attempts. If this fails too we increase the concurrency level
3497 // so that the starving thread would get an lwp
3498
3499 void os::yield_all(int attempts) {
3500 // Yields to all threads, including threads with lower priorities
3501 if (attempts == 0) {
3502 os::sleep(Thread::current(), 1, false);
3503 } else {
3504 int iterations = attempts % 30;
3505 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3506 // thr_setconcurrency and _getconcurrency make sense only under T1.
3507 int noofLWPS = thr_getconcurrency();
3508 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3509 thr_setconcurrency(thr_getconcurrency() + 1);
3510 }
3511 } else if (iterations < 25) {
3512 os::sleep(Thread::current(), 1, false);
3513 } else {
3514 os::sleep(Thread::current(), 10, false);
3515 }
3516 }
3517 }
3518
3519 // Called from the tight loops to possibly influence time-sharing heuristics
3520 void os::loop_breaker(int attempts) {
3521 os::yield_all(attempts);
3522 }
3523
3524
3525 // Interface for setting lwp priorities. If we are using T2 libthread,
3526 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3527 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3528 // function is meaningless in this mode so we must adjust the real lwp's priority
3529 // The routines below implement the getting and setting of lwp priorities.
3530 //
3531 // Note: There are three priority scales used on Solaris. Java priotities
3532 // which range from 1 to 10, libthread "thr_setprio" scale which range
3533 // from 0 to 127, and the current scheduling class of the process we
3534 // are running in. This is typically from -60 to +60.
3535 // The setting of the lwp priorities in done after a call to thr_setprio
3536 // so Java priorities are mapped to libthread priorities and we map from
3537 // the latter to lwp priorities. We don't keep priorities stored in
3538 // Java priorities since some of our worker threads want to set priorities
3539 // higher than all Java threads.
3540 //
3541 // For related information:
3542 // (1) man -s 2 priocntl
3543 // (2) man -s 4 priocntl
3544 // (3) man dispadmin
3545 // = librt.so
3546 // = libthread/common/rtsched.c - thrp_setlwpprio().
3547 // = ps -cL <pid> ... to validate priority.
3548 // = sched_get_priority_min and _max
3549 // pthread_create
3550 // sched_setparam
3551 // pthread_setschedparam
3552 //
3553 // Assumptions:
3554 // + We assume that all threads in the process belong to the same
3555 // scheduling class. IE. an homogenous process.
3556 // + Must be root or in IA group to change change "interactive" attribute.
3557 // Priocntl() will fail silently. The only indication of failure is when
3558 // we read-back the value and notice that it hasn't changed.
3559 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3560 // + For RT, change timeslice as well. Invariant:
3561 // constant "priority integral"
3562 // Konst == TimeSlice * (60-Priority)
3563 // Given a priority, compute appropriate timeslice.
3564 // + Higher numerical values have higher priority.
3565
3566 // sched class attributes
3567 typedef struct {
3568 int schedPolicy; // classID
3569 int maxPrio;
3570 int minPrio;
3571 } SchedInfo;
3572
3573
3574 static SchedInfo tsLimits, iaLimits, rtLimits;
3575
3576 #ifdef ASSERT
3577 static int ReadBackValidate = 1;
3578 #endif
3579 static int myClass = 0;
3580 static int myMin = 0;
3581 static int myMax = 0;
3582 static int myCur = 0;
3583 static bool priocntl_enable = false;
3584
3585
3586 // Call the version of priocntl suitable for all supported versions
3587 // of Solaris. We need to call through this wrapper so that we can
3588 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3589 //
3590 // This code should be removed if we ever stop supporting Solaris 8
3591 // and earlier releases.
3592
3593 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3594 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3595 static priocntl_type priocntl_ptr = priocntl_stub;
3596
3597 // Stub to set the value of the real pointer, and then call the real
3598 // function.
3599
3600 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3601 // Try Solaris 8- name only.
3602 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3603 guarantee(tmp != NULL, "priocntl function not found.");
3604 priocntl_ptr = tmp;
3605 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3606 }
3607
3608
3609 // lwp_priocntl_init
3610 //
3611 // Try to determine the priority scale for our process.
3612 //
3613 // Return errno or 0 if OK.
3614 //
3615 static
3616 int lwp_priocntl_init ()
3617 {
3618 int rslt;
3619 pcinfo_t ClassInfo;
3620 pcparms_t ParmInfo;
3621 int i;
3622
3623 if (!UseThreadPriorities) return 0;
3624
3625 // We are using Bound threads, we need to determine our priority ranges
3626 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3627 // If ThreadPriorityPolicy is 1, switch tables
3628 if (ThreadPriorityPolicy == 1) {
3629 for (i = 0 ; i < MaxPriority+1; i++)
3630 os::java_to_os_priority[i] = prio_policy1[i];
3631 }
3632 }
3633 // Not using Bound Threads, set to ThreadPolicy 1
3634 else {
3635 for ( i = 0 ; i < MaxPriority+1; i++ ) {
3636 os::java_to_os_priority[i] = prio_policy1[i];
3637 }
3638 return 0;
3639 }
3640
3641
3642 // Get IDs for a set of well-known scheduling classes.
3643 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3644 // the system. We should have a loop that iterates over the
3645 // classID values, which are known to be "small" integers.
3646
3647 strcpy(ClassInfo.pc_clname, "TS");
3648 ClassInfo.pc_cid = -1;
3649 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3650 if (rslt < 0) return errno;
3651 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3652 tsLimits.schedPolicy = ClassInfo.pc_cid;
3653 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3654 tsLimits.minPrio = -tsLimits.maxPrio;
3655
3656 strcpy(ClassInfo.pc_clname, "IA");
3657 ClassInfo.pc_cid = -1;
3658 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3659 if (rslt < 0) return errno;
3660 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3661 iaLimits.schedPolicy = ClassInfo.pc_cid;
3662 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3663 iaLimits.minPrio = -iaLimits.maxPrio;
3664
3665 strcpy(ClassInfo.pc_clname, "RT");
3666 ClassInfo.pc_cid = -1;
3667 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3668 if (rslt < 0) return errno;
3669 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3670 rtLimits.schedPolicy = ClassInfo.pc_cid;
3671 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3672 rtLimits.minPrio = 0;
3673
3674
3675 // Query our "current" scheduling class.
3676 // This will normally be IA,TS or, rarely, RT.
3677 memset (&ParmInfo, 0, sizeof(ParmInfo));
3678 ParmInfo.pc_cid = PC_CLNULL;
3679 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo );
3680 if ( rslt < 0 ) return errno;
3681 myClass = ParmInfo.pc_cid;
3682
3683 // We now know our scheduling classId, get specific information
3684 // the class.
3685 ClassInfo.pc_cid = myClass;
3686 ClassInfo.pc_clname[0] = 0;
3687 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo );
3688 if ( rslt < 0 ) return errno;
3689
3690 if (ThreadPriorityVerbose)
3691 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3692
3693 memset(&ParmInfo, 0, sizeof(pcparms_t));
3694 ParmInfo.pc_cid = PC_CLNULL;
3695 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3696 if (rslt < 0) return errno;
3697
3698 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3699 myMin = rtLimits.minPrio;
3700 myMax = rtLimits.maxPrio;
3701 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3702 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3703 myMin = iaLimits.minPrio;
3704 myMax = iaLimits.maxPrio;
3705 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3706 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3707 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3708 myMin = tsLimits.minPrio;
3709 myMax = tsLimits.maxPrio;
3710 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3711 } else {
3712 // No clue - punt
3713 if (ThreadPriorityVerbose)
3714 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3715 return EINVAL; // no clue, punt
3716 }
3717
3718 if (ThreadPriorityVerbose)
3719 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3720
3721 priocntl_enable = true; // Enable changing priorities
3722 return 0;
3723 }
3724
3725 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3726 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3727 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3728
3729
3730 // scale_to_lwp_priority
3731 //
3732 // Convert from the libthread "thr_setprio" scale to our current
3733 // lwp scheduling class scale.
3734 //
3735 static
3736 int scale_to_lwp_priority (int rMin, int rMax, int x)
3737 {
3738 int v;
3739
3740 if (x == 127) return rMax; // avoid round-down
3741 v = (((x*(rMax-rMin)))/128)+rMin;
3742 return v;
3743 }
3744
3745
3746 // set_lwp_priority
3747 //
3748 // Set the priority of the lwp. This call should only be made
3749 // when using bound threads (T2 threads are bound by default).
3750 //
3751 int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
3752 {
3753 int rslt;
3754 int Actual, Expected, prv;
3755 pcparms_t ParmInfo; // for GET-SET
3756 #ifdef ASSERT
3757 pcparms_t ReadBack; // for readback
3758 #endif
3759
3760 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3761 // Query current values.
3762 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3763 // Cache "pcparms_t" in global ParmCache.
3764 // TODO: elide set-to-same-value
3765
3766 // If something went wrong on init, don't change priorities.
3767 if ( !priocntl_enable ) {
3768 if (ThreadPriorityVerbose)
3769 tty->print_cr("Trying to set priority but init failed, ignoring");
3770 return EINVAL;
3771 }
3772
3773
3774 // If lwp hasn't started yet, just return
3775 // the _start routine will call us again.
3776 if ( lwpid <= 0 ) {
3777 if (ThreadPriorityVerbose) {
3778 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set",
3779 ThreadID, newPrio);
3780 }
3781 return 0;
3782 }
3783
3784 if (ThreadPriorityVerbose) {
3785 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3786 ThreadID, lwpid, newPrio);
3787 }
3788
3789 memset(&ParmInfo, 0, sizeof(pcparms_t));
3790 ParmInfo.pc_cid = PC_CLNULL;
3791 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3792 if (rslt < 0) return errno;
3793
3794 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3795 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3796 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio);
3797 rtInfo->rt_tqsecs = RT_NOCHANGE;
3798 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3799 if (ThreadPriorityVerbose) {
3800 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3801 }
3802 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3803 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3804 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim);
3805 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio);
3806 iaInfo->ia_uprilim = IA_NOCHANGE;
3807 iaInfo->ia_mode = IA_NOCHANGE;
3808 if (ThreadPriorityVerbose) {
3809 tty->print_cr ("IA: [%d...%d] %d->%d\n",
3810 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3811 }
3812 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3813 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3814 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim);
3815 prv = tsInfo->ts_upri;
3816 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio);
3817 tsInfo->ts_uprilim = IA_NOCHANGE;
3818 if (ThreadPriorityVerbose) {
3819 tty->print_cr ("TS: %d [%d...%d] %d->%d\n",
3820 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3821 }
3822 if (prv == tsInfo->ts_upri) return 0;
3823 } else {
3824 if ( ThreadPriorityVerbose ) {
3825 tty->print_cr ("Unknown scheduling class\n");
3826 }
3827 return EINVAL; // no clue, punt
3828 }
3829
3830 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3831 if (ThreadPriorityVerbose && rslt) {
3832 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3833 }
3834 if (rslt < 0) return errno;
3835
3836 #ifdef ASSERT
3837 // Sanity check: read back what we just attempted to set.
3838 // In theory it could have changed in the interim ...
3839 //
3840 // The priocntl system call is tricky.
3841 // Sometimes it'll validate the priority value argument and
3842 // return EINVAL if unhappy. At other times it fails silently.
3843 // Readbacks are prudent.
3844
3845 if (!ReadBackValidate) return 0;
3846
3847 memset(&ReadBack, 0, sizeof(pcparms_t));
3848 ReadBack.pc_cid = PC_CLNULL;
3849 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3850 assert(rslt >= 0, "priocntl failed");
3851 Actual = Expected = 0xBAD;
3852 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3853 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3854 Actual = RTPRI(ReadBack)->rt_pri;
3855 Expected = RTPRI(ParmInfo)->rt_pri;
3856 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3857 Actual = IAPRI(ReadBack)->ia_upri;
3858 Expected = IAPRI(ParmInfo)->ia_upri;
3859 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3860 Actual = TSPRI(ReadBack)->ts_upri;
3861 Expected = TSPRI(ParmInfo)->ts_upri;
3862 } else {
3863 if ( ThreadPriorityVerbose ) {
3864 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid);
3865 }
3866 }
3867
3868 if (Actual != Expected) {
3869 if ( ThreadPriorityVerbose ) {
3870 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3871 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3872 }
3873 }
3874 #endif
3875
3876 return 0;
3877 }
3878
3879
3880
3881 // Solaris only gives access to 128 real priorities at a time,
3882 // so we expand Java's ten to fill this range. This would be better
3883 // if we dynamically adjusted relative priorities.
3884 //
3885 // The ThreadPriorityPolicy option allows us to select 2 different
3886 // priority scales.
3887 //
3888 // ThreadPriorityPolicy=0
3889 // Since the Solaris' default priority is MaximumPriority, we do not
3890 // set a priority lower than Max unless a priority lower than
3891 // NormPriority is requested.
3892 //
3893 // ThreadPriorityPolicy=1
3894 // This mode causes the priority table to get filled with
3895 // linear values. NormPriority get's mapped to 50% of the
3896 // Maximum priority an so on. This will cause VM threads
3897 // to get unfair treatment against other Solaris processes
3898 // which do not explicitly alter their thread priorities.
3899 //
3900
3901
3902 int os::java_to_os_priority[MaxPriority + 1] = {
3903 -99999, // 0 Entry should never be used
3904
3905 0, // 1 MinPriority
3906 32, // 2
3907 64, // 3
3908
3909 96, // 4
3910 127, // 5 NormPriority
3911 127, // 6
3912
3913 127, // 7
3914 127, // 8
3915 127, // 9 NearMaxPriority
3916
3917 127 // 10 MaxPriority
3918 };
3919
3920
3921 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3922 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3923 if ( !UseThreadPriorities ) return OS_OK;
3924 int status = thr_setprio(thread->osthread()->thread_id(), newpri);
3925 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) )
3926 status |= (set_lwp_priority (thread->osthread()->thread_id(),
3927 thread->osthread()->lwp_id(), newpri ));
3928 return (status == 0) ? OS_OK : OS_ERR;
3929 }
3930
3931
3932 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3933 int p;
3934 if ( !UseThreadPriorities ) {
3935 *priority_ptr = NormalPriority;
3936 return OS_OK;
3937 }
3938 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3939 if (status != 0) {
3940 return OS_ERR;
3941 }
3942 *priority_ptr = p;
3943 return OS_OK;
3944 }
3945
3946
3947 // Hint to the underlying OS that a task switch would not be good.
3948 // Void return because it's a hint and can fail.
3949 void os::hint_no_preempt() {
3950 schedctl_start(schedctl_init());
3951 }
3952
3953 void os::interrupt(Thread* thread) {
3954 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3955
3956 OSThread* osthread = thread->osthread();
3957
3958 int isInterrupted = osthread->interrupted();
3959 if (!isInterrupted) {
3960 osthread->set_interrupted(true);
3961 OrderAccess::fence();
3962 // os::sleep() is implemented with either poll (NULL,0,timeout) or
3963 // by parking on _SleepEvent. If the former, thr_kill will unwedge
3964 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
3965 ParkEvent * const slp = thread->_SleepEvent ;
3966 if (slp != NULL) slp->unpark() ;
3967 }
3968
3969 // For JSR166: unpark after setting status but before thr_kill -dl
3970 if (thread->is_Java_thread()) {
3971 ((JavaThread*)thread)->parker()->unpark();
3972 }
3973
3974 // Handle interruptible wait() ...
3975 ParkEvent * const ev = thread->_ParkEvent ;
3976 if (ev != NULL) ev->unpark() ;
3977
3978 // When events are used everywhere for os::sleep, then this thr_kill
3979 // will only be needed if UseVMInterruptibleIO is true.
3980
3981 if (!isInterrupted) {
3982 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
3983 assert_status(status == 0, status, "thr_kill");
3984
3985 // Bump thread interruption counter
3986 RuntimeService::record_thread_interrupt_signaled_count();
3987 }
3988 }
3989
3990
3991 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3992 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3993
3994 OSThread* osthread = thread->osthread();
3995
3996 bool res = osthread->interrupted();
3997
3998 // NOTE that since there is no "lock" around these two operations,
3999 // there is the possibility that the interrupted flag will be
4000 // "false" but that the interrupt event will be set. This is
4001 // intentional. The effect of this is that Object.wait() will appear
4002 // to have a spurious wakeup, which is not harmful, and the
4003 // possibility is so rare that it is not worth the added complexity
4004 // to add yet another lock. It has also been recommended not to put
4005 // the interrupted flag into the os::Solaris::Event structure,
4006 // because it hides the issue.
4007 if (res && clear_interrupted) {
4008 osthread->set_interrupted(false);
4009 }
4010 return res;
4011 }
4012
4013
4014 void os::print_statistics() {
4015 }
4016
4017 int os::message_box(const char* title, const char* message) {
4018 int i;
4019 fdStream err(defaultStream::error_fd());
4020 for (i = 0; i < 78; i++) err.print_raw("=");
4021 err.cr();
4022 err.print_raw_cr(title);
4023 for (i = 0; i < 78; i++) err.print_raw("-");
4024 err.cr();
4025 err.print_raw_cr(message);
4026 for (i = 0; i < 78; i++) err.print_raw("=");
4027 err.cr();
4028
4029 char buf[16];
4030 // Prevent process from exiting upon "read error" without consuming all CPU
4031 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4032
4033 return buf[0] == 'y' || buf[0] == 'Y';
4034 }
4035
4036 // A lightweight implementation that does not suspend the target thread and
4037 // thus returns only a hint. Used for profiling only!
4038 ExtendedPC os::get_thread_pc(Thread* thread) {
4039 // Make sure that it is called by the watcher and the Threads lock is owned.
4040 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4041 // For now, is only used to profile the VM Thread
4042 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4043 ExtendedPC epc;
4044
4045 GetThreadPC_Callback cb(ProfileVM_lock);
4046 OSThread *osthread = thread->osthread();
4047 const int time_to_wait = 400; // 400ms wait for initial response
4048 int status = cb.interrupt(thread, time_to_wait);
4049
4050 if (cb.is_done() ) {
4051 epc = cb.addr();
4052 } else {
4053 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4054 osthread->thread_id(), status););
4055 // epc is already NULL
4056 }
4057 return epc;
4058 }
4059
4060
4061 // This does not do anything on Solaris. This is basically a hook for being
4062 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4063 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4064 f(value, method, args, thread);
4065 }
4066
4067 // This routine may be used by user applications as a "hook" to catch signals.
4068 // The user-defined signal handler must pass unrecognized signals to this
4069 // routine, and if it returns true (non-zero), then the signal handler must
4070 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4071 // routine will never retun false (zero), but instead will execute a VM panic
4072 // routine kill the process.
4073 //
4074 // If this routine returns false, it is OK to call it again. This allows
4075 // the user-defined signal handler to perform checks either before or after
4076 // the VM performs its own checks. Naturally, the user code would be making
4077 // a serious error if it tried to handle an exception (such as a null check
4078 // or breakpoint) that the VM was generating for its own correct operation.
4079 //
4080 // This routine may recognize any of the following kinds of signals:
4081 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4082 // os::Solaris::SIGasync
4083 // It should be consulted by handlers for any of those signals.
4084 // It explicitly does not recognize os::Solaris::SIGinterrupt
4085 //
4086 // The caller of this routine must pass in the three arguments supplied
4087 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4088 // field of the structure passed to sigaction(). This routine assumes that
4089 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4090 //
4091 // Note that the VM will print warnings if it detects conflicting signal
4092 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4093 //
4094 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
4095
4096
4097 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4098 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4099 }
4100
4101 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4102 is needed to provoke threads blocked on IO to return an EINTR
4103 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4104 does NOT participate in signal chaining due to requirement for
4105 NOT setting SA_RESTART to make EINTR work. */
4106 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4107 if (UseSignalChaining) {
4108 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4109 if (actp && actp->sa_handler) {
4110 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4111 }
4112 }
4113 }
4114
4115 // This boolean allows users to forward their own non-matching signals
4116 // to JVM_handle_solaris_signal, harmlessly.
4117 bool os::Solaris::signal_handlers_are_installed = false;
4118
4119 // For signal-chaining
4120 bool os::Solaris::libjsig_is_loaded = false;
4121 typedef struct sigaction *(*get_signal_t)(int);
4122 get_signal_t os::Solaris::get_signal_action = NULL;
4123
4124 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4125 struct sigaction *actp = NULL;
4126
4127 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4128 // Retrieve the old signal handler from libjsig
4129 actp = (*get_signal_action)(sig);
4130 }
4131 if (actp == NULL) {
4132 // Retrieve the preinstalled signal handler from jvm
4133 actp = get_preinstalled_handler(sig);
4134 }
4135
4136 return actp;
4137 }
4138
4139 static bool call_chained_handler(struct sigaction *actp, int sig,
4140 siginfo_t *siginfo, void *context) {
4141 // Call the old signal handler
4142 if (actp->sa_handler == SIG_DFL) {
4143 // It's more reasonable to let jvm treat it as an unexpected exception
4144 // instead of taking the default action.
4145 return false;
4146 } else if (actp->sa_handler != SIG_IGN) {
4147 if ((actp->sa_flags & SA_NODEFER) == 0) {
4148 // automaticlly block the signal
4149 sigaddset(&(actp->sa_mask), sig);
4150 }
4151
4152 sa_handler_t hand;
4153 sa_sigaction_t sa;
4154 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4155 // retrieve the chained handler
4156 if (siginfo_flag_set) {
4157 sa = actp->sa_sigaction;
4158 } else {
4159 hand = actp->sa_handler;
4160 }
4161
4162 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4163 actp->sa_handler = SIG_DFL;
4164 }
4165
4166 // try to honor the signal mask
4167 sigset_t oset;
4168 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4169
4170 // call into the chained handler
4171 if (siginfo_flag_set) {
4172 (*sa)(sig, siginfo, context);
4173 } else {
4174 (*hand)(sig);
4175 }
4176
4177 // restore the signal mask
4178 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4179 }
4180 // Tell jvm's signal handler the signal is taken care of.
4181 return true;
4182 }
4183
4184 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4185 bool chained = false;
4186 // signal-chaining
4187 if (UseSignalChaining) {
4188 struct sigaction *actp = get_chained_signal_action(sig);
4189 if (actp != NULL) {
4190 chained = call_chained_handler(actp, sig, siginfo, context);
4191 }
4192 }
4193 return chained;
4194 }
4195
4196 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4197 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4198 if (preinstalled_sigs[sig] != 0) {
4199 return &chainedsigactions[sig];
4200 }
4201 return NULL;
4202 }
4203
4204 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4205
4206 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4207 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4208 chainedsigactions[sig] = oldAct;
4209 preinstalled_sigs[sig] = 1;
4210 }
4211
4212 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4213 // Check for overwrite.
4214 struct sigaction oldAct;
4215 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4216 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4217 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4218 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4219 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4220 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4221 if (AllowUserSignalHandlers || !set_installed) {
4222 // Do not overwrite; user takes responsibility to forward to us.
4223 return;
4224 } else if (UseSignalChaining) {
4225 if (oktochain) {
4226 // save the old handler in jvm
4227 save_preinstalled_handler(sig, oldAct);
4228 } else {
4229 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4230 }
4231 // libjsig also interposes the sigaction() call below and saves the
4232 // old sigaction on it own.
4233 } else {
4234 fatal2("Encountered unexpected pre-existing sigaction handler %#lx for signal %d.", (long)oldhand, sig);
4235 }
4236 }
4237
4238 struct sigaction sigAct;
4239 sigfillset(&(sigAct.sa_mask));
4240 sigAct.sa_handler = SIG_DFL;
4241
4242 sigAct.sa_sigaction = signalHandler;
4243 // Handle SIGSEGV on alternate signal stack if
4244 // not using stack banging
4245 if (!UseStackBanging && sig == SIGSEGV) {
4246 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4247 // Interruptible i/o requires SA_RESTART cleared so EINTR
4248 // is returned instead of restarting system calls
4249 } else if (sig == os::Solaris::SIGinterrupt()) {
4250 sigemptyset(&sigAct.sa_mask);
4251 sigAct.sa_handler = NULL;
4252 sigAct.sa_flags = SA_SIGINFO;
4253 sigAct.sa_sigaction = sigINTRHandler;
4254 } else {
4255 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4256 }
4257 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4258
4259 sigaction(sig, &sigAct, &oldAct);
4260
4261 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4262 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4263 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4264 }
4265
4266
4267 #define DO_SIGNAL_CHECK(sig) \
4268 if (!sigismember(&check_signal_done, sig)) \
4269 os::Solaris::check_signal_handler(sig)
4270
4271 // This method is a periodic task to check for misbehaving JNI applications
4272 // under CheckJNI, we can add any periodic checks here
4273
4274 void os::run_periodic_checks() {
4275 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4276 // thereby preventing a NULL checks.
4277 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4278
4279 if (check_signals == false) return;
4280
4281 // SEGV and BUS if overridden could potentially prevent
4282 // generation of hs*.log in the event of a crash, debugging
4283 // such a case can be very challenging, so we absolutely
4284 // check for the following for a good measure:
4285 DO_SIGNAL_CHECK(SIGSEGV);
4286 DO_SIGNAL_CHECK(SIGILL);
4287 DO_SIGNAL_CHECK(SIGFPE);
4288 DO_SIGNAL_CHECK(SIGBUS);
4289 DO_SIGNAL_CHECK(SIGPIPE);
4290 DO_SIGNAL_CHECK(SIGXFSZ);
4291
4292 // ReduceSignalUsage allows the user to override these handlers
4293 // see comments at the very top and jvm_solaris.h
4294 if (!ReduceSignalUsage) {
4295 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4296 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4297 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4298 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4299 }
4300
4301 // See comments above for using JVM1/JVM2 and UseAltSigs
4302 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4303 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4304
4305 }
4306
4307 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4308
4309 static os_sigaction_t os_sigaction = NULL;
4310
4311 void os::Solaris::check_signal_handler(int sig) {
4312 char buf[O_BUFLEN];
4313 address jvmHandler = NULL;
4314
4315 struct sigaction act;
4316 if (os_sigaction == NULL) {
4317 // only trust the default sigaction, in case it has been interposed
4318 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4319 if (os_sigaction == NULL) return;
4320 }
4321
4322 os_sigaction(sig, (struct sigaction*)NULL, &act);
4323
4324 address thisHandler = (act.sa_flags & SA_SIGINFO)
4325 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4326 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4327
4328
4329 switch(sig) {
4330 case SIGSEGV:
4331 case SIGBUS:
4332 case SIGFPE:
4333 case SIGPIPE:
4334 case SIGXFSZ:
4335 case SIGILL:
4336 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4337 break;
4338
4339 case SHUTDOWN1_SIGNAL:
4340 case SHUTDOWN2_SIGNAL:
4341 case SHUTDOWN3_SIGNAL:
4342 case BREAK_SIGNAL:
4343 jvmHandler = (address)user_handler();
4344 break;
4345
4346 default:
4347 int intrsig = os::Solaris::SIGinterrupt();
4348 int asynsig = os::Solaris::SIGasync();
4349
4350 if (sig == intrsig) {
4351 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4352 } else if (sig == asynsig) {
4353 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4354 } else {
4355 return;
4356 }
4357 break;
4358 }
4359
4360
4361 if (thisHandler != jvmHandler) {
4362 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4363 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4364 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4365 // No need to check this sig any longer
4366 sigaddset(&check_signal_done, sig);
4367 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4368 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4369 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4370 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4371 // No need to check this sig any longer
4372 sigaddset(&check_signal_done, sig);
4373 }
4374
4375 // Print all the signal handler state
4376 if (sigismember(&check_signal_done, sig)) {
4377 print_signal_handlers(tty, buf, O_BUFLEN);
4378 }
4379
4380 }
4381
4382 void os::Solaris::install_signal_handlers() {
4383 bool libjsigdone = false;
4384 signal_handlers_are_installed = true;
4385
4386 // signal-chaining
4387 typedef void (*signal_setting_t)();
4388 signal_setting_t begin_signal_setting = NULL;
4389 signal_setting_t end_signal_setting = NULL;
4390 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4391 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4392 if (begin_signal_setting != NULL) {
4393 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4394 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4395 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4396 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4397 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4398 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4399 libjsig_is_loaded = true;
4400 if (os::Solaris::get_libjsig_version != NULL) {
4401 libjsigversion = (*os::Solaris::get_libjsig_version)();
4402 }
4403 assert(UseSignalChaining, "should enable signal-chaining");
4404 }
4405 if (libjsig_is_loaded) {
4406 // Tell libjsig jvm is setting signal handlers
4407 (*begin_signal_setting)();
4408 }
4409
4410 set_signal_handler(SIGSEGV, true, true);
4411 set_signal_handler(SIGPIPE, true, true);
4412 set_signal_handler(SIGXFSZ, true, true);
4413 set_signal_handler(SIGBUS, true, true);
4414 set_signal_handler(SIGILL, true, true);
4415 set_signal_handler(SIGFPE, true, true);
4416
4417
4418 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4419
4420 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4421 // can not register overridable signals which might be > 32
4422 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4423 // Tell libjsig jvm has finished setting signal handlers
4424 (*end_signal_setting)();
4425 libjsigdone = true;
4426 }
4427 }
4428
4429 // Never ok to chain our SIGinterrupt
4430 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4431 set_signal_handler(os::Solaris::SIGasync(), true, true);
4432
4433 if (libjsig_is_loaded && !libjsigdone) {
4434 // Tell libjsig jvm finishes setting signal handlers
4435 (*end_signal_setting)();
4436 }
4437
4438 // We don't activate signal checker if libjsig is in place, we trust ourselves
4439 // and if UserSignalHandler is installed all bets are off
4440 if (CheckJNICalls) {
4441 if (libjsig_is_loaded) {
4442 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4443 check_signals = false;
4444 }
4445 if (AllowUserSignalHandlers) {
4446 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4447 check_signals = false;
4448 }
4449 }
4450 }
4451
4452
4453 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4454
4455 const char * signames[] = {
4456 "SIG0",
4457 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4458 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4459 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4460 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4461 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4462 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4463 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4464 "SIGCANCEL", "SIGLOST"
4465 };
4466
4467 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4468 if (0 < exception_code && exception_code <= SIGRTMAX) {
4469 // signal
4470 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4471 jio_snprintf(buf, size, "%s", signames[exception_code]);
4472 } else {
4473 jio_snprintf(buf, size, "SIG%d", exception_code);
4474 }
4475 return buf;
4476 } else {
4477 return NULL;
4478 }
4479 }
4480
4481 // (Static) wrappers for the new libthread API
4482 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4483 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4484 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4485 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4486 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4487
4488 // (Static) wrapper for getisax(2) call.
4489 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4490
4491 // (Static) wrappers for the liblgrp API
4492 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4493 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4494 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4495 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4496 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4497 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4498 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4499 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4500 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4501
4502 // (Static) wrapper for meminfo() call.
4503 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4504
4505 static address resolve_symbol_lazy(const char* name) {
4506 address addr = (address) dlsym(RTLD_DEFAULT, name);
4507 if(addr == NULL) {
4508 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4509 addr = (address) dlsym(RTLD_NEXT, name);
4510 }
4511 return addr;
4512 }
4513
4514 static address resolve_symbol(const char* name) {
4515 address addr = resolve_symbol_lazy(name);
4516 if(addr == NULL) {
4517 fatal(dlerror());
4518 }
4519 return addr;
4520 }
4521
4522
4523
4524 // isT2_libthread()
4525 //
4526 // Routine to determine if we are currently using the new T2 libthread.
4527 //
4528 // We determine if we are using T2 by reading /proc/self/lstatus and
4529 // looking for a thread with the ASLWP bit set. If we find this status
4530 // bit set, we must assume that we are NOT using T2. The T2 team
4531 // has approved this algorithm.
4532 //
4533 // We need to determine if we are running with the new T2 libthread
4534 // since setting native thread priorities is handled differently
4535 // when using this library. All threads created using T2 are bound
4536 // threads. Calling thr_setprio is meaningless in this case.
4537 //
4538 bool isT2_libthread() {
4539 static prheader_t * lwpArray = NULL;
4540 static int lwpSize = 0;
4541 static int lwpFile = -1;
4542 lwpstatus_t * that;
4543 char lwpName [128];
4544 bool isT2 = false;
4545
4546 #define ADR(x) ((uintptr_t)(x))
4547 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4548
4549 lwpFile = open("/proc/self/lstatus", O_RDONLY, 0);
4550 if (lwpFile < 0) {
4551 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4552 return false;
4553 }
4554 lwpSize = 16*1024;
4555 for (;;) {
4556 lseek (lwpFile, 0, SEEK_SET);
4557 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize);
4558 if (read(lwpFile, lwpArray, lwpSize) < 0) {
4559 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4560 break;
4561 }
4562 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4563 // We got a good snapshot - now iterate over the list.
4564 int aslwpcount = 0;
4565 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4566 that = LWPINDEX(lwpArray,i);
4567 if (that->pr_flags & PR_ASLWP) {
4568 aslwpcount++;
4569 }
4570 }
4571 if (aslwpcount == 0) isT2 = true;
4572 break;
4573 }
4574 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4575 FREE_C_HEAP_ARRAY(char, lwpArray); // retry.
4576 }
4577
4578 FREE_C_HEAP_ARRAY(char, lwpArray);
4579 close (lwpFile);
4580 if (ThreadPriorityVerbose) {
4581 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4582 else tty->print_cr("We are not running with a T2 libthread\n");
4583 }
4584 return isT2;
4585 }
4586
4587
4588 void os::Solaris::libthread_init() {
4589 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4590
4591 // Determine if we are running with the new T2 libthread
4592 os::Solaris::set_T2_libthread(isT2_libthread());
4593
4594 lwp_priocntl_init();
4595
4596 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4597 if(func == NULL) {
4598 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4599 // Guarantee that this VM is running on an new enough OS (5.6 or
4600 // later) that it will have a new enough libthread.so.
4601 guarantee(func != NULL, "libthread.so is too old.");
4602 }
4603
4604 // Initialize the new libthread getstate API wrappers
4605 func = resolve_symbol("thr_getstate");
4606 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4607
4608 func = resolve_symbol("thr_setstate");
4609 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4610
4611 func = resolve_symbol("thr_setmutator");
4612 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4613
4614 func = resolve_symbol("thr_suspend_mutator");
4615 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4616
4617 func = resolve_symbol("thr_continue_mutator");
4618 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4619
4620 int size;
4621 void (*handler_info_func)(address *, int *);
4622 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4623 handler_info_func(&handler_start, &size);
4624 handler_end = handler_start + size;
4625 }
4626
4627
4628 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4629 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4630 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4631 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4632 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4633 int os::Solaris::_mutex_scope = USYNC_THREAD;
4634
4635 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4636 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4637 int_fnP_cond_tP os::Solaris::_cond_signal;
4638 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4639 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4640 int_fnP_cond_tP os::Solaris::_cond_destroy;
4641 int os::Solaris::_cond_scope = USYNC_THREAD;
4642
4643 void os::Solaris::synchronization_init() {
4644 if(UseLWPSynchronization) {
4645 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4646 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4647 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4648 os::Solaris::set_mutex_init(lwp_mutex_init);
4649 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4650 os::Solaris::set_mutex_scope(USYNC_THREAD);
4651
4652 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4653 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4654 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4655 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4656 os::Solaris::set_cond_init(lwp_cond_init);
4657 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4658 os::Solaris::set_cond_scope(USYNC_THREAD);
4659 }
4660 else {
4661 os::Solaris::set_mutex_scope(USYNC_THREAD);
4662 os::Solaris::set_cond_scope(USYNC_THREAD);
4663
4664 if(UsePthreads) {
4665 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4666 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4667 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4668 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4669 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4670
4671 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4672 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4673 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4674 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4675 os::Solaris::set_cond_init(pthread_cond_default_init);
4676 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4677 }
4678 else {
4679 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4680 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4681 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4682 os::Solaris::set_mutex_init(::mutex_init);
4683 os::Solaris::set_mutex_destroy(::mutex_destroy);
4684
4685 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4686 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4687 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4688 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4689 os::Solaris::set_cond_init(::cond_init);
4690 os::Solaris::set_cond_destroy(::cond_destroy);
4691 }
4692 }
4693 }
4694
4695 bool os::Solaris::liblgrp_init() {
4696 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4697 if (handle != NULL) {
4698 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4699 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4700 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4701 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4702 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4703 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4704 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4705 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4706 dlsym(handle, "lgrp_cookie_stale")));
4707
4708 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4709 set_lgrp_cookie(c);
4710 return true;
4711 }
4712 return false;
4713 }
4714
4715 void os::Solaris::misc_sym_init() {
4716 address func;
4717
4718 // getisax
4719 func = resolve_symbol_lazy("getisax");
4720 if (func != NULL) {
4721 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4722 }
4723
4724 // meminfo
4725 func = resolve_symbol_lazy("meminfo");
4726 if (func != NULL) {
4727 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4728 }
4729 }
4730
4731 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4732 assert(_getisax != NULL, "_getisax not set");
4733 return _getisax(array, n);
4734 }
4735
4736 // Symbol doesn't exist in Solaris 8 pset.h
4737 #ifndef PS_MYID
4738 #define PS_MYID -3
4739 #endif
4740
4741 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4742 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4743 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4744
4745 void init_pset_getloadavg_ptr(void) {
4746 pset_getloadavg_ptr =
4747 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4748 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4749 warning("pset_getloadavg function not found");
4750 }
4751 }
4752
4753 int os::Solaris::_dev_zero_fd = -1;
4754
4755 // this is called _before_ the global arguments have been parsed
4756 void os::init(void) {
4757 _initial_pid = getpid();
4758
4759 max_hrtime = first_hrtime = gethrtime();
4760
4761 init_random(1234567);
4762
4763 page_size = sysconf(_SC_PAGESIZE);
4764 if (page_size == -1)
4765 fatal1("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno));
4766 init_page_sizes((size_t) page_size);
4767
4768 Solaris::initialize_system_info();
4769
4770 // Initialize misc. symbols as soon as possible, so we can use them
4771 // if we need them.
4772 Solaris::misc_sym_init();
4773
4774 int fd = open("/dev/zero", O_RDWR);
4775 if (fd < 0) {
4776 fatal1("os::init: cannot open /dev/zero (%s)", strerror(errno));
4777 } else {
4778 Solaris::set_dev_zero_fd(fd);
4779
4780 // Close on exec, child won't inherit.
4781 fcntl(fd, F_SETFD, FD_CLOEXEC);
4782 }
4783
4784 clock_tics_per_sec = CLK_TCK;
4785
4786 // check if dladdr1() exists; dladdr1 can provide more information than
4787 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4788 // and is available on linker patches for 5.7 and 5.8.
4789 // libdl.so must have been loaded, this call is just an entry lookup
4790 void * hdl = dlopen("libdl.so", RTLD_NOW);
4791 if (hdl)
4792 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4793
4794 // (Solaris only) this switches to calls that actually do locking.
4795 ThreadCritical::initialize();
4796
4797 main_thread = thr_self();
4798
4799 // Constant minimum stack size allowed. It must be at least
4800 // the minimum of what the OS supports (thr_min_stack()), and
4801 // enough to allow the thread to get to user bytecode execution.
4802 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4803 // If the pagesize of the VM is greater than 8K determine the appropriate
4804 // number of initial guard pages. The user can change this with the
4805 // command line arguments, if needed.
4806 if (vm_page_size() > 8*K) {
4807 StackYellowPages = 1;
4808 StackRedPages = 1;
4809 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4810 }
4811 }
4812
4813 // To install functions for atexit system call
4814 extern "C" {
4815 static void perfMemory_exit_helper() {
4816 perfMemory_exit();
4817 }
4818 }
4819
4820 // this is called _after_ the global arguments have been parsed
4821 jint os::init_2(void) {
4822 // try to enable extended file IO ASAP, see 6431278
4823 os::Solaris::try_enable_extended_io();
4824
4825 // Allocate a single page and mark it as readable for safepoint polling. Also
4826 // use this first mmap call to check support for MAP_ALIGN.
4827 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4828 page_size,
4829 MAP_PRIVATE | MAP_ALIGN,
4830 PROT_READ);
4831 if (polling_page == NULL) {
4832 has_map_align = false;
4833 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4834 PROT_READ);
4835 }
4836
4837 os::set_polling_page(polling_page);
4838
4839 #ifndef PRODUCT
4840 if( Verbose && PrintMiscellaneous )
4841 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4842 #endif
4843
4844 if (!UseMembar) {
4845 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4846 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4847 os::set_memory_serialize_page( mem_serialize_page );
4848
4849 #ifndef PRODUCT
4850 if(Verbose && PrintMiscellaneous)
4851 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4852 #endif
4853 }
4854
4855 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
4856
4857 // Check minimum allowable stack size for thread creation and to initialize
4858 // the java system classes, including StackOverflowError - depends on page
4859 // size. Add a page for compiler2 recursion in main thread.
4860 // Add in BytesPerWord times page size to account for VM stack during
4861 // class initialization depending on 32 or 64 bit VM.
4862 guarantee((Solaris::min_stack_allowed >=
4863 (StackYellowPages+StackRedPages+StackShadowPages+BytesPerWord
4864 COMPILER2_PRESENT(+1)) * page_size),
4865 "need to increase Solaris::min_stack_allowed on this platform");
4866
4867 size_t threadStackSizeInBytes = ThreadStackSize * K;
4868 if (threadStackSizeInBytes != 0 &&
4869 threadStackSizeInBytes < Solaris::min_stack_allowed) {
4870 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4871 Solaris::min_stack_allowed/K);
4872 return JNI_ERR;
4873 }
4874
4875 // For 64kbps there will be a 64kb page size, which makes
4876 // the usable default stack size quite a bit less. Increase the
4877 // stack for 64kb (or any > than 8kb) pages, this increases
4878 // virtual memory fragmentation (since we're not creating the
4879 // stack on a power of 2 boundary. The real fix for this
4880 // should be to fix the guard page mechanism.
4881
4882 if (vm_page_size() > 8*K) {
4883 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4884 ? threadStackSizeInBytes +
4885 ((StackYellowPages + StackRedPages) * vm_page_size())
4886 : 0;
4887 ThreadStackSize = threadStackSizeInBytes/K;
4888 }
4889
4890 // Make the stack size a multiple of the page size so that
4891 // the yellow/red zones can be guarded.
4892 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4893 vm_page_size()));
4894
4895 Solaris::libthread_init();
4896
4897 if (UseNUMA) {
4898 if (!Solaris::liblgrp_init()) {
4899 UseNUMA = false;
4900 } else {
4901 size_t lgrp_limit = os::numa_get_groups_num();
4902 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit);
4903 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4904 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4905 if (lgrp_num < 2) {
4906 // There's only one locality group, disable NUMA.
4907 UseNUMA = false;
4908 }
4909 }
4910 if (!UseNUMA && ForceNUMA) {
4911 UseNUMA = true;
4912 }
4913 }
4914
4915 Solaris::signal_sets_init();
4916 Solaris::init_signal_mem();
4917 Solaris::install_signal_handlers();
4918
4919 if (libjsigversion < JSIG_VERSION_1_4_1) {
4920 Maxlibjsigsigs = OLDMAXSIGNUM;
4921 }
4922
4923 // initialize synchronization primitives to use either thread or
4924 // lwp synchronization (controlled by UseLWPSynchronization)
4925 Solaris::synchronization_init();
4926
4927 if (MaxFDLimit) {
4928 // set the number of file descriptors to max. print out error
4929 // if getrlimit/setrlimit fails but continue regardless.
4930 struct rlimit nbr_files;
4931 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4932 if (status != 0) {
4933 if (PrintMiscellaneous && (Verbose || WizardMode))
4934 perror("os::init_2 getrlimit failed");
4935 } else {
4936 nbr_files.rlim_cur = nbr_files.rlim_max;
4937 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4938 if (status != 0) {
4939 if (PrintMiscellaneous && (Verbose || WizardMode))
4940 perror("os::init_2 setrlimit failed");
4941 }
4942 }
4943 }
4944
4945 // Initialize HPI.
4946 jint hpi_result = hpi::initialize();
4947 if (hpi_result != JNI_OK) {
4948 tty->print_cr("There was an error trying to initialize the HPI library.");
4949 return hpi_result;
4950 }
4951
4952 // Calculate theoretical max. size of Threads to guard gainst
4953 // artifical out-of-memory situations, where all available address-
4954 // space has been reserved by thread stacks. Default stack size is 1Mb.
4955 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4956 JavaThread::stack_size_at_create() : (1*K*K);
4957 assert(pre_thread_stack_size != 0, "Must have a stack");
4958 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4959 // we should start doing Virtual Memory banging. Currently when the threads will
4960 // have used all but 200Mb of space.
4961 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4962 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4963
4964 // at-exit methods are called in the reverse order of their registration.
4965 // In Solaris 7 and earlier, atexit functions are called on return from
4966 // main or as a result of a call to exit(3C). There can be only 32 of
4967 // these functions registered and atexit() does not set errno. In Solaris
4968 // 8 and later, there is no limit to the number of functions registered
4969 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4970 // functions are called upon dlclose(3DL) in addition to return from main
4971 // and exit(3C).
4972
4973 if (PerfAllowAtExitRegistration) {
4974 // only register atexit functions if PerfAllowAtExitRegistration is set.
4975 // atexit functions can be delayed until process exit time, which
4976 // can be problematic for embedded VM situations. Embedded VMs should
4977 // call DestroyJavaVM() to assure that VM resources are released.
4978
4979 // note: perfMemory_exit_helper atexit function may be removed in
4980 // the future if the appropriate cleanup code can be added to the
4981 // VM_Exit VMOperation's doit method.
4982 if (atexit(perfMemory_exit_helper) != 0) {
4983 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4984 }
4985 }
4986
4987 // Init pset_loadavg function pointer
4988 init_pset_getloadavg_ptr();
4989
4990 return JNI_OK;
4991 }
4992
4993
4994 // Mark the polling page as unreadable
4995 void os::make_polling_page_unreadable(void) {
4996 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
4997 fatal("Could not disable polling page");
4998 };
4999
5000 // Mark the polling page as readable
5001 void os::make_polling_page_readable(void) {
5002 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5003 fatal("Could not enable polling page");
5004 };
5005
5006 // OS interface.
5007
5008 int os::stat(const char *path, struct stat *sbuf) {
5009 char pathbuf[MAX_PATH];
5010 if (strlen(path) > MAX_PATH - 1) {
5011 errno = ENAMETOOLONG;
5012 return -1;
5013 }
5014 hpi::native_path(strcpy(pathbuf, path));
5015 return ::stat(pathbuf, sbuf);
5016 }
5017
5018
5019 bool os::check_heap(bool force) { return true; }
5020
5021 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5022 static vsnprintf_t sol_vsnprintf = NULL;
5023
5024 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5025 if (!sol_vsnprintf) {
5026 //search for the named symbol in the objects that were loaded after libjvm
5027 void* where = RTLD_NEXT;
5028 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5029 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5030 if (!sol_vsnprintf){
5031 //search for the named symbol in the objects that were loaded before libjvm
5032 where = RTLD_DEFAULT;
5033 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5034 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5035 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5036 }
5037 }
5038 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5039 }
5040
5041
5042 // Is a (classpath) directory empty?
5043 bool os::dir_is_empty(const char* path) {
5044 DIR *dir = NULL;
5045 struct dirent *ptr;
5046
5047 dir = opendir(path);
5048 if (dir == NULL) return true;
5049
5050 /* Scan the directory */
5051 bool result = true;
5052 char buf[sizeof(struct dirent) + MAX_PATH];
5053 struct dirent *dbuf = (struct dirent *) buf;
5054 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5055 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5056 result = false;
5057 }
5058 }
5059 closedir(dir);
5060 return result;
5061 }
5062
5063 // create binary file, rewriting existing file if required
5064 int os::create_binary_file(const char* path, bool rewrite_existing) {
5065 int oflags = O_WRONLY | O_CREAT;
5066 if (!rewrite_existing) {
5067 oflags |= O_EXCL;
5068 }
5069 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5070 }
5071
5072 // return current position of file pointer
5073 jlong os::current_file_offset(int fd) {
5074 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5075 }
5076
5077 // move file pointer to the specified offset
5078 jlong os::seek_to_file_offset(int fd, jlong offset) {
5079 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5080 }
5081
5082 // Map a block of memory.
5083 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
5084 char *addr, size_t bytes, bool read_only,
5085 bool allow_exec) {
5086 int prot;
5087 int flags;
5088
5089 if (read_only) {
5090 prot = PROT_READ;
5091 flags = MAP_SHARED;
5092 } else {
5093 prot = PROT_READ | PROT_WRITE;
5094 flags = MAP_PRIVATE;
5095 }
5096
5097 if (allow_exec) {
5098 prot |= PROT_EXEC;
5099 }
5100
5101 if (addr != NULL) {
5102 flags |= MAP_FIXED;
5103 }
5104
5105 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5106 fd, file_offset);
5107 if (mapped_address == MAP_FAILED) {
5108 return NULL;
5109 }
5110 return mapped_address;
5111 }
5112
5113
5114 // Remap a block of memory.
5115 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
5116 char *addr, size_t bytes, bool read_only,
5117 bool allow_exec) {
5118 // same as map_memory() on this OS
5119 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5120 allow_exec);
5121 }
5122
5123
5124 // Unmap a block of memory.
5125 bool os::unmap_memory(char* addr, size_t bytes) {
5126 return munmap(addr, bytes) == 0;
5127 }
5128
5129 void os::pause() {
5130 char filename[MAX_PATH];
5131 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5132 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5133 } else {
5134 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5135 }
5136
5137 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5138 if (fd != -1) {
5139 struct stat buf;
5140 close(fd);
5141 while (::stat(filename, &buf) == 0) {
5142 (void)::poll(NULL, 0, 100);
5143 }
5144 } else {
5145 jio_fprintf(stderr,
5146 "Could not open pause file '%s', continuing immediately.\n", filename);
5147 }
5148 }
5149
5150 #ifndef PRODUCT
5151 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5152 // Turn this on if you need to trace synch operations.
5153 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5154 // and call record_synch_enable and record_synch_disable
5155 // around the computation of interest.
5156
5157 void record_synch(char* name, bool returning); // defined below
5158
5159 class RecordSynch {
5160 char* _name;
5161 public:
5162 RecordSynch(char* name) :_name(name)
5163 { record_synch(_name, false); }
5164 ~RecordSynch() { record_synch(_name, true); }
5165 };
5166
5167 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5168 extern "C" ret name params { \
5169 typedef ret name##_t params; \
5170 static name##_t* implem = NULL; \
5171 static int callcount = 0; \
5172 if (implem == NULL) { \
5173 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5174 if (implem == NULL) fatal(dlerror()); \
5175 } \
5176 ++callcount; \
5177 RecordSynch _rs(#name); \
5178 inner; \
5179 return implem args; \
5180 }
5181 // in dbx, examine callcounts this way:
5182 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5183
5184 #define CHECK_POINTER_OK(p) \
5185 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p)))
5186 #define CHECK_MU \
5187 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5188 #define CHECK_CV \
5189 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5190 #define CHECK_P(p) \
5191 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5192
5193 #define CHECK_MUTEX(mutex_op) \
5194 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5195
5196 CHECK_MUTEX( mutex_lock)
5197 CHECK_MUTEX( _mutex_lock)
5198 CHECK_MUTEX( mutex_unlock)
5199 CHECK_MUTEX(_mutex_unlock)
5200 CHECK_MUTEX( mutex_trylock)
5201 CHECK_MUTEX(_mutex_trylock)
5202
5203 #define CHECK_COND(cond_op) \
5204 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5205
5206 CHECK_COND( cond_wait);
5207 CHECK_COND(_cond_wait);
5208 CHECK_COND(_cond_wait_cancel);
5209
5210 #define CHECK_COND2(cond_op) \
5211 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5212
5213 CHECK_COND2( cond_timedwait);
5214 CHECK_COND2(_cond_timedwait);
5215 CHECK_COND2(_cond_timedwait_cancel);
5216
5217 // do the _lwp_* versions too
5218 #define mutex_t lwp_mutex_t
5219 #define cond_t lwp_cond_t
5220 CHECK_MUTEX( _lwp_mutex_lock)
5221 CHECK_MUTEX( _lwp_mutex_unlock)
5222 CHECK_MUTEX( _lwp_mutex_trylock)
5223 CHECK_MUTEX( __lwp_mutex_lock)
5224 CHECK_MUTEX( __lwp_mutex_unlock)
5225 CHECK_MUTEX( __lwp_mutex_trylock)
5226 CHECK_MUTEX(___lwp_mutex_lock)
5227 CHECK_MUTEX(___lwp_mutex_unlock)
5228
5229 CHECK_COND( _lwp_cond_wait);
5230 CHECK_COND( __lwp_cond_wait);
5231 CHECK_COND(___lwp_cond_wait);
5232
5233 CHECK_COND2( _lwp_cond_timedwait);
5234 CHECK_COND2( __lwp_cond_timedwait);
5235 #undef mutex_t
5236 #undef cond_t
5237
5238 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5239 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5240 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5241 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5242 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5243 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5244 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5245 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5246
5247
5248 // recording machinery:
5249
5250 enum { RECORD_SYNCH_LIMIT = 200 };
5251 char* record_synch_name[RECORD_SYNCH_LIMIT];
5252 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5253 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5254 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5255 int record_synch_count = 0;
5256 bool record_synch_enabled = false;
5257
5258 // in dbx, examine recorded data this way:
5259 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5260
5261 void record_synch(char* name, bool returning) {
5262 if (record_synch_enabled) {
5263 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5264 record_synch_name[record_synch_count] = name;
5265 record_synch_returning[record_synch_count] = returning;
5266 record_synch_thread[record_synch_count] = thr_self();
5267 record_synch_arg0ptr[record_synch_count] = &name;
5268 record_synch_count++;
5269 }
5270 // put more checking code here:
5271 // ...
5272 }
5273 }
5274
5275 void record_synch_enable() {
5276 // start collecting trace data, if not already doing so
5277 if (!record_synch_enabled) record_synch_count = 0;
5278 record_synch_enabled = true;
5279 }
5280
5281 void record_synch_disable() {
5282 // stop collecting trace data
5283 record_synch_enabled = false;
5284 }
5285
5286 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5287 #endif // PRODUCT
5288
5289 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5290 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5291 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5292
5293
5294 // JVMTI & JVM monitoring and management support
5295 // The thread_cpu_time() and current_thread_cpu_time() are only
5296 // supported if is_thread_cpu_time_supported() returns true.
5297 // They are not supported on Solaris T1.
5298
5299 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5300 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5301 // of a thread.
5302 //
5303 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5304 // returns the fast estimate available on the platform.
5305
5306 // hrtime_t gethrvtime() return value includes
5307 // user time but does not include system time
5308 jlong os::current_thread_cpu_time() {
5309 return (jlong) gethrvtime();
5310 }
5311
5312 jlong os::thread_cpu_time(Thread *thread) {
5313 // return user level CPU time only to be consistent with
5314 // what current_thread_cpu_time returns.
5315 // thread_cpu_time_info() must be changed if this changes
5316 return os::thread_cpu_time(thread, false /* user time only */);
5317 }
5318
5319 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5320 if (user_sys_cpu_time) {
5321 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5322 } else {
5323 return os::current_thread_cpu_time();
5324 }
5325 }
5326
5327 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5328 char proc_name[64];
5329 int count;
5330 prusage_t prusage;
5331 jlong lwp_time;
5332 int fd;
5333
5334 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5335 getpid(),
5336 thread->osthread()->lwp_id());
5337 fd = open(proc_name, O_RDONLY);
5338 if ( fd == -1 ) return -1;
5339
5340 do {
5341 count = pread(fd,
5342 (void *)&prusage.pr_utime,
5343 thr_time_size,
5344 thr_time_off);
5345 } while (count < 0 && errno == EINTR);
5346 close(fd);
5347 if ( count < 0 ) return -1;
5348
5349 if (user_sys_cpu_time) {
5350 // user + system CPU time
5351 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5352 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5353 (jlong)prusage.pr_stime.tv_nsec +
5354 (jlong)prusage.pr_utime.tv_nsec;
5355 } else {
5356 // user level CPU time only
5357 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5358 (jlong)prusage.pr_utime.tv_nsec;
5359 }
5360
5361 return(lwp_time);
5362 }
5363
5364 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5365 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5366 info_ptr->may_skip_backward = false; // elapsed time not wall time
5367 info_ptr->may_skip_forward = false; // elapsed time not wall time
5368 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5369 }
5370
5371 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5372 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5373 info_ptr->may_skip_backward = false; // elapsed time not wall time
5374 info_ptr->may_skip_forward = false; // elapsed time not wall time
5375 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5376 }
5377
5378 bool os::is_thread_cpu_time_supported() {
5379 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5380 return true;
5381 } else {
5382 return false;
5383 }
5384 }
5385
5386 // System loadavg support. Returns -1 if load average cannot be obtained.
5387 // Return the load average for our processor set if the primitive exists
5388 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5389 int os::loadavg(double loadavg[], int nelem) {
5390 if (pset_getloadavg_ptr != NULL) {
5391 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5392 } else {
5393 return ::getloadavg(loadavg, nelem);
5394 }
5395 }
5396
5397 //---------------------------------------------------------------------------------
5398 #ifndef PRODUCT
5399
5400 static address same_page(address x, address y) {
5401 intptr_t page_bits = -os::vm_page_size();
5402 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
5403 return x;
5404 else if (x > y)
5405 return (address)(intptr_t(y) | ~page_bits) + 1;
5406 else
5407 return (address)(intptr_t(y) & page_bits);
5408 }
5409
5410 bool os::find(address addr) {
5411 Dl_info dlinfo;
5412 memset(&dlinfo, 0, sizeof(dlinfo));
5413 if (dladdr(addr, &dlinfo)) {
5414 #ifdef _LP64
5415 tty->print("0x%016lx: ", addr);
5416 #else
5417 tty->print("0x%08x: ", addr);
5418 #endif
5419 if (dlinfo.dli_sname != NULL)
5420 tty->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5421 else if (dlinfo.dli_fname)
5422 tty->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5423 else
5424 tty->print("<absolute address>");
5425 if (dlinfo.dli_fname) tty->print(" in %s", dlinfo.dli_fname);
5426 #ifdef _LP64
5427 if (dlinfo.dli_fbase) tty->print(" at 0x%016lx", dlinfo.dli_fbase);
5428 #else
5429 if (dlinfo.dli_fbase) tty->print(" at 0x%08x", dlinfo.dli_fbase);
5430 #endif
5431 tty->cr();
5432
5433 if (Verbose) {
5434 // decode some bytes around the PC
5435 address begin = same_page(addr-40, addr);
5436 address end = same_page(addr+40, addr);
5437 address lowest = (address) dlinfo.dli_sname;
5438 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5439 if (begin < lowest) begin = lowest;
5440 Dl_info dlinfo2;
5441 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5442 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5443 end = (address) dlinfo2.dli_saddr;
5444 Disassembler::decode(begin, end);
5445 }
5446 return true;
5447 }
5448 return false;
5449 }
5450
5451 #endif
5452
5453
5454 // Following function has been added to support HotSparc's libjvm.so running
5455 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5456 // src/solaris/hpi/native_threads in the EVM codebase.
5457 //
5458 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5459 // libraries and should thus be removed. We will leave it behind for a while
5460 // until we no longer want to able to run on top of 1.3.0 Solaris production
5461 // JDK. See 4341971.
5462
5463 #define STACK_SLACK 0x800
5464
5465 extern "C" {
5466 intptr_t sysThreadAvailableStackWithSlack() {
5467 stack_t st;
5468 intptr_t retval, stack_top;
5469 retval = thr_stksegment(&st);
5470 assert(retval == 0, "incorrect return value from thr_stksegment");
5471 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5472 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5473 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5474 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5475 }
5476 }
5477
5478 // Just to get the Kernel build to link on solaris for testing.
5479
5480 extern "C" {
5481 class ASGCT_CallTrace;
5482 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext)
5483 KERNEL_RETURN;
5484 }
5485
5486
5487 // ObjectMonitor park-unpark infrastructure ...
5488 //
5489 // We implement Solaris and Linux PlatformEvents with the
5490 // obvious condvar-mutex-flag triple.
5491 // Another alternative that works quite well is pipes:
5492 // Each PlatformEvent consists of a pipe-pair.
5493 // The thread associated with the PlatformEvent
5494 // calls park(), which reads from the input end of the pipe.
5495 // Unpark() writes into the other end of the pipe.
5496 // The write-side of the pipe must be set NDELAY.
5497 // Unfortunately pipes consume a large # of handles.
5498 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5499 // Using pipes for the 1st few threads might be workable, however.
5500 //
5501 // park() is permitted to return spuriously.
5502 // Callers of park() should wrap the call to park() in
5503 // an appropriate loop. A litmus test for the correct
5504 // usage of park is the following: if park() were modified
5505 // to immediately return 0 your code should still work,
5506 // albeit degenerating to a spin loop.
5507 //
5508 // An interesting optimization for park() is to use a trylock()
5509 // to attempt to acquire the mutex. If the trylock() fails
5510 // then we know that a concurrent unpark() operation is in-progress.
5511 // in that case the park() code could simply set _count to 0
5512 // and return immediately. The subsequent park() operation *might*
5513 // return immediately. That's harmless as the caller of park() is
5514 // expected to loop. By using trylock() we will have avoided a
5515 // avoided a context switch caused by contention on the per-thread mutex.
5516 //
5517 // TODO-FIXME:
5518 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5519 // objectmonitor implementation.
5520 // 2. Collapse the JSR166 parker event, and the
5521 // objectmonitor ParkEvent into a single "Event" construct.
5522 // 3. In park() and unpark() add:
5523 // assert (Thread::current() == AssociatedWith).
5524 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5525 // 1-out-of-N park() operations will return immediately.
5526 //
5527 // _Event transitions in park()
5528 // -1 => -1 : illegal
5529 // 1 => 0 : pass - return immediately
5530 // 0 => -1 : block
5531 //
5532 // _Event serves as a restricted-range semaphore.
5533 //
5534 // Another possible encoding of _Event would be with
5535 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5536 //
5537 // TODO-FIXME: add DTRACE probes for:
5538 // 1. Tx parks
5539 // 2. Ty unparks Tx
5540 // 3. Tx resumes from park
5541
5542
5543 // value determined through experimentation
5544 #define ROUNDINGFIX 11
5545
5546 // utility to compute the abstime argument to timedwait.
5547 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5548
5549 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5550 // millis is the relative timeout time
5551 // abstime will be the absolute timeout time
5552 if (millis < 0) millis = 0;
5553 struct timeval now;
5554 int status = gettimeofday(&now, NULL);
5555 assert(status == 0, "gettimeofday");
5556 jlong seconds = millis / 1000;
5557 jlong max_wait_period;
5558
5559 if (UseLWPSynchronization) {
5560 // forward port of fix for 4275818 (not sleeping long enough)
5561 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5562 // _lwp_cond_timedwait() used a round_down algorithm rather
5563 // than a round_up. For millis less than our roundfactor
5564 // it rounded down to 0 which doesn't meet the spec.
5565 // For millis > roundfactor we may return a bit sooner, but
5566 // since we can not accurately identify the patch level and
5567 // this has already been fixed in Solaris 9 and 8 we will
5568 // leave it alone rather than always rounding down.
5569
5570 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5571 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5572 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5573 max_wait_period = 21000000;
5574 } else {
5575 max_wait_period = 50000000;
5576 }
5577 millis %= 1000;
5578 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5579 seconds = max_wait_period;
5580 }
5581 abstime->tv_sec = now.tv_sec + seconds;
5582 long usec = now.tv_usec + millis * 1000;
5583 if (usec >= 1000000) {
5584 abstime->tv_sec += 1;
5585 usec -= 1000000;
5586 }
5587 abstime->tv_nsec = usec * 1000;
5588 return abstime;
5589 }
5590
5591 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5592 // Conceptually TryPark() should be equivalent to park(0).
5593
5594 int os::PlatformEvent::TryPark() {
5595 for (;;) {
5596 const int v = _Event ;
5597 guarantee ((v == 0) || (v == 1), "invariant") ;
5598 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5599 }
5600 }
5601
5602 void os::PlatformEvent::park() { // AKA: down()
5603 // Invariant: Only the thread associated with the Event/PlatformEvent
5604 // may call park().
5605 int v ;
5606 for (;;) {
5607 v = _Event ;
5608 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5609 }
5610 guarantee (v >= 0, "invariant") ;
5611 if (v == 0) {
5612 // Do this the hard way by blocking ...
5613 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5614 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5615 // Only for SPARC >= V8PlusA
5616 #if defined(__sparc) && defined(COMPILER2)
5617 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5618 #endif
5619 int status = os::Solaris::mutex_lock(_mutex);
5620 assert_status(status == 0, status, "mutex_lock");
5621 guarantee (_nParked == 0, "invariant") ;
5622 ++ _nParked ;
5623 while (_Event < 0) {
5624 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5625 // Treat this the same as if the wait was interrupted
5626 // With usr/lib/lwp going to kernel, always handle ETIME
5627 status = os::Solaris::cond_wait(_cond, _mutex);
5628 if (status == ETIME) status = EINTR ;
5629 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5630 }
5631 -- _nParked ;
5632 _Event = 0 ;
5633 status = os::Solaris::mutex_unlock(_mutex);
5634 assert_status(status == 0, status, "mutex_unlock");
5635 }
5636 }
5637
5638 int os::PlatformEvent::park(jlong millis) {
5639 guarantee (_nParked == 0, "invariant") ;
5640 int v ;
5641 for (;;) {
5642 v = _Event ;
5643 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5644 }
5645 guarantee (v >= 0, "invariant") ;
5646 if (v != 0) return OS_OK ;
5647
5648 int ret = OS_TIMEOUT;
5649 timestruc_t abst;
5650 compute_abstime (&abst, millis);
5651
5652 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5653 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5654 // Only for SPARC >= V8PlusA
5655 #if defined(__sparc) && defined(COMPILER2)
5656 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5657 #endif
5658 int status = os::Solaris::mutex_lock(_mutex);
5659 assert_status(status == 0, status, "mutex_lock");
5660 guarantee (_nParked == 0, "invariant") ;
5661 ++ _nParked ;
5662 while (_Event < 0) {
5663 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5664 assert_status(status == 0 || status == EINTR ||
5665 status == ETIME || status == ETIMEDOUT,
5666 status, "cond_timedwait");
5667 if (!FilterSpuriousWakeups) break ; // previous semantics
5668 if (status == ETIME || status == ETIMEDOUT) break ;
5669 // We consume and ignore EINTR and spurious wakeups.
5670 }
5671 -- _nParked ;
5672 if (_Event >= 0) ret = OS_OK ;
5673 _Event = 0 ;
5674 status = os::Solaris::mutex_unlock(_mutex);
5675 assert_status(status == 0, status, "mutex_unlock");
5676 return ret;
5677 }
5678
5679 void os::PlatformEvent::unpark() {
5680 int v, AnyWaiters;
5681
5682 // Increment _Event.
5683 // Another acceptable implementation would be to simply swap 1
5684 // into _Event:
5685 // if (Swap (&_Event, 1) < 0) {
5686 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ;
5687 // if (AnyWaiters) cond_signal (_cond) ;
5688 // }
5689
5690 for (;;) {
5691 v = _Event ;
5692 if (v > 0) {
5693 // The LD of _Event could have reordered or be satisfied
5694 // by a read-aside from this processor's write buffer.
5695 // To avoid problems execute a barrier and then
5696 // ratify the value. A degenerate CAS() would also work.
5697 // Viz., CAS (v+0, &_Event, v) == v).
5698 OrderAccess::fence() ;
5699 if (_Event == v) return ;
5700 continue ;
5701 }
5702 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
5703 }
5704
5705 // If the thread associated with the event was parked, wake it.
5706 if (v < 0) {
5707 int status ;
5708 // Wait for the thread assoc with the PlatformEvent to vacate.
5709 status = os::Solaris::mutex_lock(_mutex);
5710 assert_status(status == 0, status, "mutex_lock");
5711 AnyWaiters = _nParked ;
5712 status = os::Solaris::mutex_unlock(_mutex);
5713 assert_status(status == 0, status, "mutex_unlock");
5714 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
5715 if (AnyWaiters != 0) {
5716 // We intentional signal *after* dropping the lock
5717 // to avoid a common class of futile wakeups.
5718 status = os::Solaris::cond_signal(_cond);
5719 assert_status(status == 0, status, "cond_signal");
5720 }
5721 }
5722 }
5723
5724 // JSR166
5725 // -------------------------------------------------------
5726
5727 /*
5728 * The solaris and linux implementations of park/unpark are fairly
5729 * conservative for now, but can be improved. They currently use a
5730 * mutex/condvar pair, plus _counter.
5731 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5732 * sets count to 1 and signals condvar. Only one thread ever waits
5733 * on the condvar. Contention seen when trying to park implies that someone
5734 * is unparking you, so don't wait. And spurious returns are fine, so there
5735 * is no need to track notifications.
5736 */
5737
5738 #define NANOSECS_PER_SEC 1000000000
5739 #define NANOSECS_PER_MILLISEC 1000000
5740 #define MAX_SECS 100000000
5741
5742 /*
5743 * This code is common to linux and solaris and will be moved to a
5744 * common place in dolphin.
5745 *
5746 * The passed in time value is either a relative time in nanoseconds
5747 * or an absolute time in milliseconds. Either way it has to be unpacked
5748 * into suitable seconds and nanoseconds components and stored in the
5749 * given timespec structure.
5750 * Given time is a 64-bit value and the time_t used in the timespec is only
5751 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5752 * overflow if times way in the future are given. Further on Solaris versions
5753 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5754 * number of seconds, in abstime, is less than current_time + 100,000,000.
5755 * As it will be 28 years before "now + 100000000" will overflow we can
5756 * ignore overflow and just impose a hard-limit on seconds using the value
5757 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5758 * years from "now".
5759 */
5760 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5761 assert (time > 0, "convertTime");
5762
5763 struct timeval now;
5764 int status = gettimeofday(&now, NULL);
5765 assert(status == 0, "gettimeofday");
5766
5767 time_t max_secs = now.tv_sec + MAX_SECS;
5768
5769 if (isAbsolute) {
5770 jlong secs = time / 1000;
5771 if (secs > max_secs) {
5772 absTime->tv_sec = max_secs;
5773 }
5774 else {
5775 absTime->tv_sec = secs;
5776 }
5777 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5778 }
5779 else {
5780 jlong secs = time / NANOSECS_PER_SEC;
5781 if (secs >= MAX_SECS) {
5782 absTime->tv_sec = max_secs;
5783 absTime->tv_nsec = 0;
5784 }
5785 else {
5786 absTime->tv_sec = now.tv_sec + secs;
5787 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5788 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5789 absTime->tv_nsec -= NANOSECS_PER_SEC;
5790 ++absTime->tv_sec; // note: this must be <= max_secs
5791 }
5792 }
5793 }
5794 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5795 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5796 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5797 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5798 }
5799
5800 void Parker::park(bool isAbsolute, jlong time) {
5801
5802 // Optional fast-path check:
5803 // Return immediately if a permit is available.
5804 if (_counter > 0) {
5805 _counter = 0 ;
5806 OrderAccess::fence();
5807 return ;
5808 }
5809
5810 // Optional fast-exit: Check interrupt before trying to wait
5811 Thread* thread = Thread::current();
5812 assert(thread->is_Java_thread(), "Must be JavaThread");
5813 JavaThread *jt = (JavaThread *)thread;
5814 if (Thread::is_interrupted(thread, false)) {
5815 return;
5816 }
5817
5818 // First, demultiplex/decode time arguments
5819 timespec absTime;
5820 if (time < 0) { // don't wait at all
5821 return;
5822 }
5823 if (time > 0) {
5824 // Warning: this code might be exposed to the old Solaris time
5825 // round-down bugs. Grep "roundingFix" for details.
5826 unpackTime(&absTime, isAbsolute, time);
5827 }
5828
5829 // Enter safepoint region
5830 // Beware of deadlocks such as 6317397.
5831 // The per-thread Parker:: _mutex is a classic leaf-lock.
5832 // In particular a thread must never block on the Threads_lock while
5833 // holding the Parker:: mutex. If safepoints are pending both the
5834 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5835 ThreadBlockInVM tbivm(jt);
5836
5837 // Don't wait if cannot get lock since interference arises from
5838 // unblocking. Also. check interrupt before trying wait
5839 if (Thread::is_interrupted(thread, false) ||
5840 os::Solaris::mutex_trylock(_mutex) != 0) {
5841 return;
5842 }
5843
5844 int status ;
5845
5846 if (_counter > 0) { // no wait needed
5847 _counter = 0;
5848 status = os::Solaris::mutex_unlock(_mutex);
5849 assert (status == 0, "invariant") ;
5850 OrderAccess::fence();
5851 return;
5852 }
5853
5854 #ifdef ASSERT
5855 // Don't catch signals while blocked; let the running threads have the signals.
5856 // (This allows a debugger to break into the running thread.)
5857 sigset_t oldsigs;
5858 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5859 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5860 #endif
5861
5862 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5863 jt->set_suspend_equivalent();
5864 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5865
5866 // Do this the hard way by blocking ...
5867 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5868 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5869 // Only for SPARC >= V8PlusA
5870 #if defined(__sparc) && defined(COMPILER2)
5871 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5872 #endif
5873
5874 if (time == 0) {
5875 status = os::Solaris::cond_wait (_cond, _mutex) ;
5876 } else {
5877 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5878 }
5879 // Note that an untimed cond_wait() can sometimes return ETIME on older
5880 // versions of the Solaris.
5881 assert_status(status == 0 || status == EINTR ||
5882 status == ETIME || status == ETIMEDOUT,
5883 status, "cond_timedwait");
5884
5885 #ifdef ASSERT
5886 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
5887 #endif
5888 _counter = 0 ;
5889 status = os::Solaris::mutex_unlock(_mutex);
5890 assert_status(status == 0, status, "mutex_unlock") ;
5891
5892 // If externally suspended while waiting, re-suspend
5893 if (jt->handle_special_suspend_equivalent_condition()) {
5894 jt->java_suspend_self();
5895 }
5896
5897 OrderAccess::fence();
5898 }
5899
5900 void Parker::unpark() {
5901 int s, status ;
5902 status = os::Solaris::mutex_lock (_mutex) ;
5903 assert (status == 0, "invariant") ;
5904 s = _counter;
5905 _counter = 1;
5906 status = os::Solaris::mutex_unlock (_mutex) ;
5907 assert (status == 0, "invariant") ;
5908
5909 if (s < 1) {
5910 status = os::Solaris::cond_signal (_cond) ;
5911 assert (status == 0, "invariant") ;
5912 }
5913 }
5914
5915 extern char** environ;
5916
5917 // Run the specified command in a separate process. Return its exit value,
5918 // or -1 on failure (e.g. can't fork a new process).
5919 // Unlike system(), this function can be called from signal handler. It
5920 // doesn't block SIGINT et al.
5921 int os::fork_and_exec(char* cmd) {
5922 char * argv[4];
5923 argv[0] = (char *)"sh";
5924 argv[1] = (char *)"-c";
5925 argv[2] = cmd;
5926 argv[3] = NULL;
5927
5928 // fork is async-safe, fork1 is not so can't use in signal handler
5929 pid_t pid;
5930 Thread* t = ThreadLocalStorage::get_thread_slow();
5931 if (t != NULL && t->is_inside_signal_handler()) {
5932 pid = fork();
5933 } else {
5934 pid = fork1();
5935 }
5936
5937 if (pid < 0) {
5938 // fork failed
5939 warning("fork failed: %s", strerror(errno));
5940 return -1;
5941
5942 } else if (pid == 0) {
5943 // child process
5944
5945 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5946 execve("/usr/bin/sh", argv, environ);
5947
5948 // execve failed
5949 _exit(-1);
5950
5951 } else {
5952 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5953 // care about the actual exit code, for now.
5954
5955 int status;
5956
5957 // Wait for the child process to exit. This returns immediately if
5958 // the child has already exited. */
5959 while (waitpid(pid, &status, 0) < 0) {
5960 switch (errno) {
5961 case ECHILD: return 0;
5962 case EINTR: break;
5963 default: return -1;
5964 }
5965 }
5966
5967 if (WIFEXITED(status)) {
5968 // The child exited normally; get its exit code.
5969 return WEXITSTATUS(status);
5970 } else if (WIFSIGNALED(status)) {
5971 // The child exited because of a signal
5972 // The best value to return is 0x80 + signal number,
5973 // because that is what all Unix shells do, and because
5974 // it allows callers to distinguish between process exit and
5975 // process death by signal.
5976 return 0x80 + WTERMSIG(status);
5977 } else {
5978 // Unknown exit code; pass it through
5979 return status;
5980 }
5981 }
5982 }