1 /*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // 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 void os::init_system_properties_values() {
680 char arch[12];
681 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
682
683 // The next steps are taken in the product version:
684 //
685 // Obtain the JAVA_HOME value from the location of libjvm[_g].so.
686 // This library should be located at:
687 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so.
688 //
689 // If "/jre/lib/" appears at the right place in the path, then we
690 // assume libjvm[_g].so is installed in a JDK and we use this path.
691 //
692 // Otherwise exit with message: "Could not create the Java virtual machine."
693 //
694 // The following extra steps are taken in the debugging version:
695 //
696 // If "/jre/lib/" does NOT appear at the right place in the path
697 // instead of exit check for $JAVA_HOME environment variable.
698 //
699 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
700 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so
701 // it looks like libjvm[_g].so is installed there
702 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so.
703 //
704 // Otherwise exit.
705 //
706 // Important note: if the location of libjvm.so changes this
707 // code needs to be changed accordingly.
708
709 // The next few definitions allow the code to be verbatim:
710 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n))
711 #define free(p) FREE_C_HEAP_ARRAY(char, p)
712 #define getenv(n) ::getenv(n)
713
714 #define EXTENSIONS_DIR "/lib/ext"
715 #define ENDORSED_DIR "/lib/endorsed"
716 #define COMMON_DIR "/usr/jdk/packages"
717
718 {
719 /* sysclasspath, java_home, dll_dir */
720 {
721 char *home_path;
722 char *dll_path;
723 char *pslash;
724 char buf[MAXPATHLEN];
725 os::jvm_path(buf, sizeof(buf));
726
727 // Found the full path to libjvm.so.
728 // Now cut the path to <java_home>/jre if we can.
729 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
730 pslash = strrchr(buf, '/');
731 if (pslash != NULL)
732 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
733 dll_path = malloc(strlen(buf) + 1);
734 if (dll_path == NULL)
735 return;
736 strcpy(dll_path, buf);
737 Arguments::set_dll_dir(dll_path);
738
739 if (pslash != NULL) {
740 pslash = strrchr(buf, '/');
741 if (pslash != NULL) {
742 *pslash = '\0'; /* get rid of /<arch> */
743 pslash = strrchr(buf, '/');
744 if (pslash != NULL)
745 *pslash = '\0'; /* get rid of /lib */
746 }
747 }
748
749 home_path = malloc(strlen(buf) + 1);
750 if (home_path == NULL)
751 return;
752 strcpy(home_path, buf);
753 Arguments::set_java_home(home_path);
754
755 if (!set_boot_path('/', ':'))
756 return;
757 }
758
759 /*
760 * Where to look for native libraries
761 */
762 {
763 // Use dlinfo() to determine the correct java.library.path.
764 //
765 // If we're launched by the Java launcher, and the user
766 // does not set java.library.path explicitly on the commandline,
767 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
768 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
769 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
770 // /usr/lib), which is exactly what we want.
771 //
772 // If the user does set java.library.path, it completely
773 // overwrites this setting, and always has.
774 //
775 // If we're not launched by the Java launcher, we may
776 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
777 // settings. Again, dlinfo does exactly what we want.
778
779 Dl_serinfo _info, *info = &_info;
780 Dl_serpath *path;
781 char* library_path;
782 char *common_path;
783 int i;
784
785 // determine search path count and required buffer size
786 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
787 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
788 }
789
790 // allocate new buffer and initialize
791 info = (Dl_serinfo*)malloc(_info.dls_size);
792 if (info == NULL) {
793 vm_exit_out_of_memory(_info.dls_size,
794 "init_system_properties_values info");
795 }
796 info->dls_size = _info.dls_size;
797 info->dls_cnt = _info.dls_cnt;
798
799 // obtain search path information
800 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
801 free(info);
802 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
803 }
804
805 path = &info->dls_serpath[0];
806
807 // Note: Due to a legacy implementation, most of the library path
808 // is set in the launcher. This was to accomodate linking restrictions
809 // on legacy Solaris implementations (which are no longer supported).
810 // Eventually, all the library path setting will be done here.
811 //
812 // However, to prevent the proliferation of improperly built native
813 // libraries, the new path component /usr/jdk/packages is added here.
814
815 // Determine the actual CPU architecture.
816 char cpu_arch[12];
817 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
818 #ifdef _LP64
819 // If we are a 64-bit vm, perform the following translations:
820 // sparc -> sparcv9
821 // i386 -> amd64
822 if (strcmp(cpu_arch, "sparc") == 0)
823 strcat(cpu_arch, "v9");
824 else if (strcmp(cpu_arch, "i386") == 0)
825 strcpy(cpu_arch, "amd64");
826 #endif
827
828 // Construct the invariant part of ld_library_path. Note that the
829 // space for the colon and the trailing null are provided by the
830 // nulls included by the sizeof operator.
831 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
832 common_path = malloc(bufsize);
833 if (common_path == NULL) {
834 free(info);
835 vm_exit_out_of_memory(bufsize,
836 "init_system_properties_values common_path");
837 }
838 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
839
840 // struct size is more than sufficient for the path components obtained
841 // through the dlinfo() call, so only add additional space for the path
842 // components explicitly added here.
843 bufsize = info->dls_size + strlen(common_path);
844 library_path = malloc(bufsize);
845 if (library_path == NULL) {
846 free(info);
847 free(common_path);
848 vm_exit_out_of_memory(bufsize,
849 "init_system_properties_values library_path");
850 }
851 library_path[0] = '\0';
852
853 // Construct the desired Java library path from the linker's library
854 // search path.
855 //
856 // For compatibility, it is optimal that we insert the additional path
857 // components specific to the Java VM after those components specified
858 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
859 // infrastructure.
860 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
861 strcpy(library_path, common_path);
862 } else {
863 int inserted = 0;
864 for (i = 0; i < info->dls_cnt; i++, path++) {
865 uint_t flags = path->dls_flags & LA_SER_MASK;
866 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
867 strcat(library_path, common_path);
868 strcat(library_path, os::path_separator());
869 inserted = 1;
870 }
871 strcat(library_path, path->dls_name);
872 strcat(library_path, os::path_separator());
873 }
874 // eliminate trailing path separator
875 library_path[strlen(library_path)-1] = '\0';
876 }
877
878 // happens before argument parsing - can't use a trace flag
879 // tty->print_raw("init_system_properties_values: native lib path: ");
880 // tty->print_raw_cr(library_path);
881
882 // callee copies into its own buffer
883 Arguments::set_library_path(library_path);
884
885 free(common_path);
886 free(library_path);
887 free(info);
888 }
889
890 /*
891 * Extensions directories.
892 *
893 * Note that the space for the colon and the trailing null are provided
894 * by the nulls included by the sizeof operator (so actually one byte more
895 * than necessary is allocated).
896 */
897 {
898 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
899 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
900 sizeof(EXTENSIONS_DIR));
901 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
902 Arguments::get_java_home());
903 Arguments::set_ext_dirs(buf);
904 }
905
906 /* Endorsed standards default directory. */
907 {
908 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
909 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
910 Arguments::set_endorsed_dirs(buf);
911 }
912 }
913
914 #undef malloc
915 #undef free
916 #undef getenv
917 #undef EXTENSIONS_DIR
918 #undef ENDORSED_DIR
919 #undef COMMON_DIR
920
921 }
922
923 void os::breakpoint() {
924 BREAKPOINT;
925 }
926
927 bool os::obsolete_option(const JavaVMOption *option)
928 {
929 if (!strncmp(option->optionString, "-Xt", 3)) {
930 return true;
931 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
932 return true;
933 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
934 return true;
935 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
936 return true;
937 }
938 return false;
939 }
940
941 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
942 address stackStart = (address)thread->stack_base();
943 address stackEnd = (address)(stackStart - (address)thread->stack_size());
944 if (sp < stackStart && sp >= stackEnd ) return true;
945 return false;
946 }
947
948 extern "C" void breakpoint() {
949 // use debugger to set breakpoint here
950 }
951
952 // Returns an estimate of the current stack pointer. Result must be guaranteed to
953 // point into the calling threads stack, and be no lower than the current stack
954 // pointer.
955 address os::current_stack_pointer() {
956 volatile int dummy;
957 address sp = (address)&dummy + 8; // %%%% need to confirm if this is right
958 return sp;
959 }
960
961 static thread_t main_thread;
962
963 // Thread start routine for all new Java threads
964 extern "C" void* java_start(void* thread_addr) {
965 // Try to randomize the cache line index of hot stack frames.
966 // This helps when threads of the same stack traces evict each other's
967 // cache lines. The threads can be either from the same JVM instance, or
968 // from different JVM instances. The benefit is especially true for
969 // processors with hyperthreading technology.
970 static int counter = 0;
971 int pid = os::current_process_id();
972 alloca(((pid ^ counter++) & 7) * 128);
973
974 int prio;
975 Thread* thread = (Thread*)thread_addr;
976 OSThread* osthr = thread->osthread();
977
978 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
979 thread->_schedctl = (void *) schedctl_init () ;
980
981 if (UseNUMA) {
982 int lgrp_id = os::numa_get_group_id();
983 if (lgrp_id != -1) {
984 thread->set_lgrp_id(lgrp_id);
985 }
986 }
987
988 // If the creator called set priority before we started,
989 // we need to call set priority now that we have an lwp.
990 // Get the priority from libthread and set the priority
991 // for the new Solaris lwp.
992 if ( osthr->thread_id() != -1 ) {
993 if ( UseThreadPriorities ) {
994 thr_getprio(osthr->thread_id(), &prio);
995 if (ThreadPriorityVerbose) {
996 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT ", setting priority: %d\n",
997 osthr->thread_id(), osthr->lwp_id(), prio );
998 }
999 os::set_native_priority(thread, prio);
1000 }
1001 } else if (ThreadPriorityVerbose) {
1002 warning("Can't set priority in _start routine, thread id hasn't been set\n");
1003 }
1004
1005 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
1006
1007 // initialize signal mask for this thread
1008 os::Solaris::hotspot_sigmask(thread);
1009
1010 thread->run();
1011
1012 // One less thread is executing
1013 // When the VMThread gets here, the main thread may have already exited
1014 // which frees the CodeHeap containing the Atomic::dec code
1015 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
1016 Atomic::dec(&os::Solaris::_os_thread_count);
1017 }
1018
1019 if (UseDetachedThreads) {
1020 thr_exit(NULL);
1021 ShouldNotReachHere();
1022 }
1023 return NULL;
1024 }
1025
1026 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
1027 // Allocate the OSThread object
1028 OSThread* osthread = new OSThread(NULL, NULL);
1029 if (osthread == NULL) return NULL;
1030
1031 // Store info on the Solaris thread into the OSThread
1032 osthread->set_thread_id(thread_id);
1033 osthread->set_lwp_id(_lwp_self());
1034 thread->_schedctl = (void *) schedctl_init () ;
1035
1036 if (UseNUMA) {
1037 int lgrp_id = os::numa_get_group_id();
1038 if (lgrp_id != -1) {
1039 thread->set_lgrp_id(lgrp_id);
1040 }
1041 }
1042
1043 if ( ThreadPriorityVerbose ) {
1044 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1045 osthread->thread_id(), osthread->lwp_id() );
1046 }
1047
1048 // Initial thread state is INITIALIZED, not SUSPENDED
1049 osthread->set_state(INITIALIZED);
1050
1051 return osthread;
1052 }
1053
1054 void os::Solaris::hotspot_sigmask(Thread* thread) {
1055
1056 //Save caller's signal mask
1057 sigset_t sigmask;
1058 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1059 OSThread *osthread = thread->osthread();
1060 osthread->set_caller_sigmask(sigmask);
1061
1062 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1063 if (!ReduceSignalUsage) {
1064 if (thread->is_VM_thread()) {
1065 // Only the VM thread handles BREAK_SIGNAL ...
1066 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1067 } else {
1068 // ... all other threads block BREAK_SIGNAL
1069 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1070 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1071 }
1072 }
1073 }
1074
1075 bool os::create_attached_thread(JavaThread* thread) {
1076 #ifdef ASSERT
1077 thread->verify_not_published();
1078 #endif
1079 OSThread* osthread = create_os_thread(thread, thr_self());
1080 if (osthread == NULL) {
1081 return false;
1082 }
1083
1084 // Initial thread state is RUNNABLE
1085 osthread->set_state(RUNNABLE);
1086 thread->set_osthread(osthread);
1087
1088 // initialize signal mask for this thread
1089 // and save the caller's signal mask
1090 os::Solaris::hotspot_sigmask(thread);
1091
1092 return true;
1093 }
1094
1095 bool os::create_main_thread(JavaThread* thread) {
1096 #ifdef ASSERT
1097 thread->verify_not_published();
1098 #endif
1099 if (_starting_thread == NULL) {
1100 _starting_thread = create_os_thread(thread, main_thread);
1101 if (_starting_thread == NULL) {
1102 return false;
1103 }
1104 }
1105
1106 // The primodial thread is runnable from the start
1107 _starting_thread->set_state(RUNNABLE);
1108
1109 thread->set_osthread(_starting_thread);
1110
1111 // initialize signal mask for this thread
1112 // and save the caller's signal mask
1113 os::Solaris::hotspot_sigmask(thread);
1114
1115 return true;
1116 }
1117
1118 // _T2_libthread is true if we believe we are running with the newer
1119 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1120 bool os::Solaris::_T2_libthread = false;
1121
1122 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1123 // Allocate the OSThread object
1124 OSThread* osthread = new OSThread(NULL, NULL);
1125 if (osthread == NULL) {
1126 return false;
1127 }
1128
1129 if ( ThreadPriorityVerbose ) {
1130 char *thrtyp;
1131 switch ( thr_type ) {
1132 case vm_thread:
1133 thrtyp = (char *)"vm";
1134 break;
1135 case cgc_thread:
1136 thrtyp = (char *)"cgc";
1137 break;
1138 case pgc_thread:
1139 thrtyp = (char *)"pgc";
1140 break;
1141 case java_thread:
1142 thrtyp = (char *)"java";
1143 break;
1144 case compiler_thread:
1145 thrtyp = (char *)"compiler";
1146 break;
1147 case watcher_thread:
1148 thrtyp = (char *)"watcher";
1149 break;
1150 default:
1151 thrtyp = (char *)"unknown";
1152 break;
1153 }
1154 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1155 }
1156
1157 // Calculate stack size if it's not specified by caller.
1158 if (stack_size == 0) {
1159 // The default stack size 1M (2M for LP64).
1160 stack_size = (BytesPerWord >> 2) * K * K;
1161
1162 switch (thr_type) {
1163 case os::java_thread:
1164 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1165 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1166 break;
1167 case os::compiler_thread:
1168 if (CompilerThreadStackSize > 0) {
1169 stack_size = (size_t)(CompilerThreadStackSize * K);
1170 break;
1171 } // else fall through:
1172 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1173 case os::vm_thread:
1174 case os::pgc_thread:
1175 case os::cgc_thread:
1176 case os::watcher_thread:
1177 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1178 break;
1179 }
1180 }
1181 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1182
1183 // Initial state is ALLOCATED but not INITIALIZED
1184 osthread->set_state(ALLOCATED);
1185
1186 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1187 // We got lots of threads. Check if we still have some address space left.
1188 // Need to be at least 5Mb of unreserved address space. We do check by
1189 // trying to reserve some.
1190 const size_t VirtualMemoryBangSize = 20*K*K;
1191 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1192 if (mem == NULL) {
1193 delete osthread;
1194 return false;
1195 } else {
1196 // Release the memory again
1197 os::release_memory(mem, VirtualMemoryBangSize);
1198 }
1199 }
1200
1201 // Setup osthread because the child thread may need it.
1202 thread->set_osthread(osthread);
1203
1204 // Create the Solaris thread
1205 // explicit THR_BOUND for T2_libthread case in case
1206 // that assumption is not accurate, but our alternate signal stack
1207 // handling is based on it which must have bound threads
1208 thread_t tid = 0;
1209 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1210 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1211 (thr_type == vm_thread) ||
1212 (thr_type == cgc_thread) ||
1213 (thr_type == pgc_thread) ||
1214 (thr_type == compiler_thread && BackgroundCompilation)) ?
1215 THR_BOUND : 0);
1216 int status;
1217
1218 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1219 //
1220 // On multiprocessors systems, libthread sometimes under-provisions our
1221 // process with LWPs. On a 30-way systems, for instance, we could have
1222 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1223 // to our process. This can result in under utilization of PEs.
1224 // I suspect the problem is related to libthread's LWP
1225 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1226 // upcall policy.
1227 //
1228 // The following code is palliative -- it attempts to ensure that our
1229 // process has sufficient LWPs to take advantage of multiple PEs.
1230 // Proper long-term cures include using user-level threads bound to LWPs
1231 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1232 // slight timing window with respect to sampling _os_thread_count, but
1233 // the race is benign. Also, we should periodically recompute
1234 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1235 // the number of PEs in our partition. You might be tempted to use
1236 // THR_NEW_LWP here, but I'd recommend against it as that could
1237 // result in undesirable growth of the libthread's LWP pool.
1238 // The fix below isn't sufficient; for instance, it doesn't take into count
1239 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1240 //
1241 // Some pathologies this scheme doesn't handle:
1242 // * Threads can block, releasing the LWPs. The LWPs can age out.
1243 // When a large number of threads become ready again there aren't
1244 // enough LWPs available to service them. This can occur when the
1245 // number of ready threads oscillates.
1246 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1247 //
1248 // Finally, we should call thr_setconcurrency() periodically to refresh
1249 // the LWP pool and thwart the LWP age-out mechanism.
1250 // The "+3" term provides a little slop -- we want to slightly overprovision.
1251
1252 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1253 if (!(flags & THR_BOUND)) {
1254 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1255 }
1256 }
1257 // Although this doesn't hurt, we should warn of undefined behavior
1258 // when using unbound T1 threads with schedctl(). This should never
1259 // happen, as the compiler and VM threads are always created bound
1260 DEBUG_ONLY(
1261 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1262 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1263 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1264 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1265 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1266 }
1267 );
1268
1269
1270 // Mark that we don't have an lwp or thread id yet.
1271 // In case we attempt to set the priority before the thread starts.
1272 osthread->set_lwp_id(-1);
1273 osthread->set_thread_id(-1);
1274
1275 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1276 if (status != 0) {
1277 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1278 perror("os::create_thread");
1279 }
1280 thread->set_osthread(NULL);
1281 // Need to clean up stuff we've allocated so far
1282 delete osthread;
1283 return false;
1284 }
1285
1286 Atomic::inc(&os::Solaris::_os_thread_count);
1287
1288 // Store info on the Solaris thread into the OSThread
1289 osthread->set_thread_id(tid);
1290
1291 // Remember that we created this thread so we can set priority on it
1292 osthread->set_vm_created();
1293
1294 // Set the default thread priority otherwise use NormalPriority
1295
1296 if ( UseThreadPriorities ) {
1297 thr_setprio(tid, (DefaultThreadPriority == -1) ?
1298 java_to_os_priority[NormPriority] :
1299 DefaultThreadPriority);
1300 }
1301
1302 // Initial thread state is INITIALIZED, not SUSPENDED
1303 osthread->set_state(INITIALIZED);
1304
1305 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1306 return true;
1307 }
1308
1309 /* defined for >= Solaris 10. This allows builds on earlier versions
1310 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1311 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1312 * and -XX:+UseAltSigs does nothing since these should have no conflict
1313 */
1314 #if !defined(SIGJVM1)
1315 #define SIGJVM1 39
1316 #define SIGJVM2 40
1317 #endif
1318
1319 debug_only(static bool signal_sets_initialized = false);
1320 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1321 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1322 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1323
1324 bool os::Solaris::is_sig_ignored(int sig) {
1325 struct sigaction oact;
1326 sigaction(sig, (struct sigaction*)NULL, &oact);
1327 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1328 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1329 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1330 return true;
1331 else
1332 return false;
1333 }
1334
1335 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1336 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1337 static bool isJVM1available() {
1338 return SIGJVM1 < SIGRTMIN;
1339 }
1340
1341 void os::Solaris::signal_sets_init() {
1342 // Should also have an assertion stating we are still single-threaded.
1343 assert(!signal_sets_initialized, "Already initialized");
1344 // Fill in signals that are necessarily unblocked for all threads in
1345 // the VM. Currently, we unblock the following signals:
1346 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1347 // by -Xrs (=ReduceSignalUsage));
1348 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1349 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1350 // the dispositions or masks wrt these signals.
1351 // Programs embedding the VM that want to use the above signals for their
1352 // own purposes must, at this time, use the "-Xrs" option to prevent
1353 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1354 // (See bug 4345157, and other related bugs).
1355 // In reality, though, unblocking these signals is really a nop, since
1356 // these signals are not blocked by default.
1357 sigemptyset(&unblocked_sigs);
1358 sigemptyset(&allowdebug_blocked_sigs);
1359 sigaddset(&unblocked_sigs, SIGILL);
1360 sigaddset(&unblocked_sigs, SIGSEGV);
1361 sigaddset(&unblocked_sigs, SIGBUS);
1362 sigaddset(&unblocked_sigs, SIGFPE);
1363
1364 if (isJVM1available) {
1365 os::Solaris::set_SIGinterrupt(SIGJVM1);
1366 os::Solaris::set_SIGasync(SIGJVM2);
1367 } else if (UseAltSigs) {
1368 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1369 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1370 } else {
1371 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1372 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1373 }
1374
1375 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1376 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1377
1378 if (!ReduceSignalUsage) {
1379 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1380 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1381 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1382 }
1383 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1384 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1385 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1386 }
1387 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1388 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1389 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1390 }
1391 }
1392 // Fill in signals that are blocked by all but the VM thread.
1393 sigemptyset(&vm_sigs);
1394 if (!ReduceSignalUsage)
1395 sigaddset(&vm_sigs, BREAK_SIGNAL);
1396 debug_only(signal_sets_initialized = true);
1397
1398 // For diagnostics only used in run_periodic_checks
1399 sigemptyset(&check_signal_done);
1400 }
1401
1402 // These are signals that are unblocked while a thread is running Java.
1403 // (For some reason, they get blocked by default.)
1404 sigset_t* os::Solaris::unblocked_signals() {
1405 assert(signal_sets_initialized, "Not initialized");
1406 return &unblocked_sigs;
1407 }
1408
1409 // These are the signals that are blocked while a (non-VM) thread is
1410 // running Java. Only the VM thread handles these signals.
1411 sigset_t* os::Solaris::vm_signals() {
1412 assert(signal_sets_initialized, "Not initialized");
1413 return &vm_sigs;
1414 }
1415
1416 // These are signals that are blocked during cond_wait to allow debugger in
1417 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1418 assert(signal_sets_initialized, "Not initialized");
1419 return &allowdebug_blocked_sigs;
1420 }
1421
1422 // First crack at OS-specific initialization, from inside the new thread.
1423 void os::initialize_thread() {
1424 int r = thr_main() ;
1425 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1426 if (r) {
1427 JavaThread* jt = (JavaThread *)Thread::current();
1428 assert(jt != NULL,"Sanity check");
1429 size_t stack_size;
1430 address base = jt->stack_base();
1431 if (Arguments::created_by_java_launcher()) {
1432 // Use 2MB to allow for Solaris 7 64 bit mode.
1433 stack_size = JavaThread::stack_size_at_create() == 0
1434 ? 2048*K : JavaThread::stack_size_at_create();
1435
1436 // There are rare cases when we may have already used more than
1437 // the basic stack size allotment before this method is invoked.
1438 // Attempt to allow for a normally sized java_stack.
1439 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1440 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1441 } else {
1442 // 6269555: If we were not created by a Java launcher, i.e. if we are
1443 // running embedded in a native application, treat the primordial thread
1444 // as much like a native attached thread as possible. This means using
1445 // the current stack size from thr_stksegment(), unless it is too large
1446 // to reliably setup guard pages. A reasonable max size is 8MB.
1447 size_t current_size = current_stack_size();
1448 // This should never happen, but just in case....
1449 if (current_size == 0) current_size = 2 * K * K;
1450 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1451 }
1452 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1453 stack_size = (size_t)(base - bottom);
1454
1455 assert(stack_size > 0, "Stack size calculation problem");
1456
1457 if (stack_size > jt->stack_size()) {
1458 NOT_PRODUCT(
1459 struct rlimit limits;
1460 getrlimit(RLIMIT_STACK, &limits);
1461 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1462 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1463 )
1464 tty->print_cr(
1465 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1466 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1467 "See limit(1) to increase the stack size limit.",
1468 stack_size / K, jt->stack_size() / K);
1469 vm_exit(1);
1470 }
1471 assert(jt->stack_size() >= stack_size,
1472 "Attempt to map more stack than was allocated");
1473 jt->set_stack_size(stack_size);
1474 }
1475
1476 // 5/22/01: Right now alternate signal stacks do not handle
1477 // throwing stack overflow exceptions, see bug 4463178
1478 // Until a fix is found for this, T2 will NOT imply alternate signal
1479 // stacks.
1480 // If using T2 libthread threads, install an alternate signal stack.
1481 // Because alternate stacks associate with LWPs on Solaris,
1482 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1483 // we prefer to explicitly stack bang.
1484 // If not using T2 libthread, but using UseBoundThreads any threads
1485 // (primordial thread, jni_attachCurrentThread) we do not create,
1486 // probably are not bound, therefore they can not have an alternate
1487 // signal stack. Since our stack banging code is generated and
1488 // is shared across threads, all threads must be bound to allow
1489 // using alternate signal stacks. The alternative is to interpose
1490 // on _lwp_create to associate an alt sig stack with each LWP,
1491 // and this could be a problem when the JVM is embedded.
1492 // We would prefer to use alternate signal stacks with T2
1493 // Since there is currently no accurate way to detect T2
1494 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1495 // on installing alternate signal stacks
1496
1497
1498 // 05/09/03: removed alternate signal stack support for Solaris
1499 // The alternate signal stack mechanism is no longer needed to
1500 // handle stack overflow. This is now handled by allocating
1501 // guard pages (red zone) and stackbanging.
1502 // Initially the alternate signal stack mechanism was removed because
1503 // it did not work with T1 llibthread. Alternate
1504 // signal stacks MUST have all threads bound to lwps. Applications
1505 // can create their own threads and attach them without their being
1506 // bound under T1. This is frequently the case for the primordial thread.
1507 // If we were ever to reenable this mechanism we would need to
1508 // use the dynamic check for T2 libthread.
1509
1510 os::Solaris::init_thread_fpu_state();
1511 }
1512
1513
1514
1515 // Free Solaris resources related to the OSThread
1516 void os::free_thread(OSThread* osthread) {
1517 assert(osthread != NULL, "os::free_thread but osthread not set");
1518
1519
1520 // We are told to free resources of the argument thread,
1521 // but we can only really operate on the current thread.
1522 // The main thread must take the VMThread down synchronously
1523 // before the main thread exits and frees up CodeHeap
1524 guarantee((Thread::current()->osthread() == osthread
1525 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1526 if (Thread::current()->osthread() == osthread) {
1527 // Restore caller's signal mask
1528 sigset_t sigmask = osthread->caller_sigmask();
1529 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1530 }
1531 delete osthread;
1532 }
1533
1534 void os::pd_start_thread(Thread* thread) {
1535 int status = thr_continue(thread->osthread()->thread_id());
1536 assert_status(status == 0, status, "thr_continue failed");
1537 }
1538
1539
1540 intx os::current_thread_id() {
1541 return (intx)thr_self();
1542 }
1543
1544 static pid_t _initial_pid = 0;
1545
1546 int os::current_process_id() {
1547 return (int)(_initial_pid ? _initial_pid : getpid());
1548 }
1549
1550 int os::allocate_thread_local_storage() {
1551 // %%% in Win32 this allocates a memory segment pointed to by a
1552 // register. Dan Stein can implement a similar feature in
1553 // Solaris. Alternatively, the VM can do the same thing
1554 // explicitly: malloc some storage and keep the pointer in a
1555 // register (which is part of the thread's context) (or keep it
1556 // in TLS).
1557 // %%% In current versions of Solaris, thr_self and TSD can
1558 // be accessed via short sequences of displaced indirections.
1559 // The value of thr_self is available as %g7(36).
1560 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1561 // assuming that the current thread already has a value bound to k.
1562 // It may be worth experimenting with such access patterns,
1563 // and later having the parameters formally exported from a Solaris
1564 // interface. I think, however, that it will be faster to
1565 // maintain the invariant that %g2 always contains the
1566 // JavaThread in Java code, and have stubs simply
1567 // treat %g2 as a caller-save register, preserving it in a %lN.
1568 thread_key_t tk;
1569 if (thr_keycreate( &tk, NULL ) )
1570 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1571 "(%s)", strerror(errno)));
1572 return int(tk);
1573 }
1574
1575 void os::free_thread_local_storage(int index) {
1576 // %%% don't think we need anything here
1577 // if ( pthread_key_delete((pthread_key_t) tk) )
1578 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1579 }
1580
1581 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1582 // small number - point is NO swap space available
1583 void os::thread_local_storage_at_put(int index, void* value) {
1584 // %%% this is used only in threadLocalStorage.cpp
1585 if (thr_setspecific((thread_key_t)index, value)) {
1586 if (errno == ENOMEM) {
1587 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space");
1588 } else {
1589 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1590 "(%s)", strerror(errno)));
1591 }
1592 } else {
1593 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1594 }
1595 }
1596
1597 // This function could be called before TLS is initialized, for example, when
1598 // VM receives an async signal or when VM causes a fatal error during
1599 // initialization. Return NULL if thr_getspecific() fails.
1600 void* os::thread_local_storage_at(int index) {
1601 // %%% this is used only in threadLocalStorage.cpp
1602 void* r = NULL;
1603 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1604 }
1605
1606
1607 const int NANOSECS_PER_MILLISECS = 1000000;
1608 // gethrtime can move backwards if read from one cpu and then a different cpu
1609 // getTimeNanos is guaranteed to not move backward on Solaris
1610 // local spinloop created as faster for a CAS on an int than
1611 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1612 // supported on sparc v8 or pre supports_cx8 intel boxes.
1613 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1614 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1615 inline hrtime_t oldgetTimeNanos() {
1616 int gotlock = LOCK_INVALID;
1617 hrtime_t newtime = gethrtime();
1618
1619 for (;;) {
1620 // grab lock for max_hrtime
1621 int curlock = max_hrtime_lock;
1622 if (curlock & LOCK_BUSY) continue;
1623 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1624 if (newtime > max_hrtime) {
1625 max_hrtime = newtime;
1626 } else {
1627 newtime = max_hrtime;
1628 }
1629 // release lock
1630 max_hrtime_lock = LOCK_FREE;
1631 return newtime;
1632 }
1633 }
1634 // gethrtime can move backwards if read from one cpu and then a different cpu
1635 // getTimeNanos is guaranteed to not move backward on Solaris
1636 inline hrtime_t getTimeNanos() {
1637 if (VM_Version::supports_cx8()) {
1638 const hrtime_t now = gethrtime();
1639 // Use atomic long load since 32-bit x86 uses 2 registers to keep long.
1640 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime);
1641 if (now <= prev) return prev; // same or retrograde time;
1642 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1643 assert(obsv >= prev, "invariant"); // Monotonicity
1644 // If the CAS succeeded then we're done and return "now".
1645 // If the CAS failed and the observed value "obs" is >= now then
1646 // we should return "obs". If the CAS failed and now > obs > prv then
1647 // some other thread raced this thread and installed a new value, in which case
1648 // we could either (a) retry the entire operation, (b) retry trying to install now
1649 // or (c) just return obs. We use (c). No loop is required although in some cases
1650 // we might discard a higher "now" value in deference to a slightly lower but freshly
1651 // installed obs value. That's entirely benign -- it admits no new orderings compared
1652 // to (a) or (b) -- and greatly reduces coherence traffic.
1653 // We might also condition (c) on the magnitude of the delta between obs and now.
1654 // Avoiding excessive CAS operations to hot RW locations is critical.
1655 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1656 return (prev == obsv) ? now : obsv ;
1657 } else {
1658 return oldgetTimeNanos();
1659 }
1660 }
1661
1662 // Time since start-up in seconds to a fine granularity.
1663 // Used by VMSelfDestructTimer and the MemProfiler.
1664 double os::elapsedTime() {
1665 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1666 }
1667
1668 jlong os::elapsed_counter() {
1669 return (jlong)(getTimeNanos() - first_hrtime);
1670 }
1671
1672 jlong os::elapsed_frequency() {
1673 return hrtime_hz;
1674 }
1675
1676 // Return the real, user, and system times in seconds from an
1677 // arbitrary fixed point in the past.
1678 bool os::getTimesSecs(double* process_real_time,
1679 double* process_user_time,
1680 double* process_system_time) {
1681 struct tms ticks;
1682 clock_t real_ticks = times(&ticks);
1683
1684 if (real_ticks == (clock_t) (-1)) {
1685 return false;
1686 } else {
1687 double ticks_per_second = (double) clock_tics_per_sec;
1688 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1689 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1690 // For consistency return the real time from getTimeNanos()
1691 // converted to seconds.
1692 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1693
1694 return true;
1695 }
1696 }
1697
1698 bool os::supports_vtime() { return true; }
1699
1700 bool os::enable_vtime() {
1701 int fd = open("/proc/self/ctl", O_WRONLY);
1702 if (fd == -1)
1703 return false;
1704
1705 long cmd[] = { PCSET, PR_MSACCT };
1706 int res = write(fd, cmd, sizeof(long) * 2);
1707 close(fd);
1708 if (res != sizeof(long) * 2)
1709 return false;
1710
1711 return true;
1712 }
1713
1714 bool os::vtime_enabled() {
1715 int fd = open("/proc/self/status", O_RDONLY);
1716 if (fd == -1)
1717 return false;
1718
1719 pstatus_t status;
1720 int res = read(fd, (void*) &status, sizeof(pstatus_t));
1721 close(fd);
1722 if (res != sizeof(pstatus_t))
1723 return false;
1724
1725 return status.pr_flags & PR_MSACCT;
1726 }
1727
1728 double os::elapsedVTime() {
1729 return (double)gethrvtime() / (double)hrtime_hz;
1730 }
1731
1732 // Used internally for comparisons only
1733 // getTimeMillis guaranteed to not move backwards on Solaris
1734 jlong getTimeMillis() {
1735 jlong nanotime = getTimeNanos();
1736 return (jlong)(nanotime / NANOSECS_PER_MILLISECS);
1737 }
1738
1739 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1740 jlong os::javaTimeMillis() {
1741 timeval t;
1742 if (gettimeofday( &t, NULL) == -1)
1743 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1744 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1745 }
1746
1747 jlong os::javaTimeNanos() {
1748 return (jlong)getTimeNanos();
1749 }
1750
1751 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1752 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1753 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1754 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1755 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1756 }
1757
1758 char * os::local_time_string(char *buf, size_t buflen) {
1759 struct tm t;
1760 time_t long_time;
1761 time(&long_time);
1762 localtime_r(&long_time, &t);
1763 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1764 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1765 t.tm_hour, t.tm_min, t.tm_sec);
1766 return buf;
1767 }
1768
1769 // Note: os::shutdown() might be called very early during initialization, or
1770 // called from signal handler. Before adding something to os::shutdown(), make
1771 // sure it is async-safe and can handle partially initialized VM.
1772 void os::shutdown() {
1773
1774 // allow PerfMemory to attempt cleanup of any persistent resources
1775 perfMemory_exit();
1776
1777 // needs to remove object in file system
1778 AttachListener::abort();
1779
1780 // flush buffered output, finish log files
1781 ostream_abort();
1782
1783 // Check for abort hook
1784 abort_hook_t abort_hook = Arguments::abort_hook();
1785 if (abort_hook != NULL) {
1786 abort_hook();
1787 }
1788 }
1789
1790 // Note: os::abort() might be called very early during initialization, or
1791 // called from signal handler. Before adding something to os::abort(), make
1792 // sure it is async-safe and can handle partially initialized VM.
1793 void os::abort(bool dump_core) {
1794 os::shutdown();
1795 if (dump_core) {
1796 #ifndef PRODUCT
1797 fdStream out(defaultStream::output_fd());
1798 out.print_raw("Current thread is ");
1799 char buf[16];
1800 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1801 out.print_raw_cr(buf);
1802 out.print_raw_cr("Dumping core ...");
1803 #endif
1804 ::abort(); // dump core (for debugging)
1805 }
1806
1807 ::exit(1);
1808 }
1809
1810 // Die immediately, no exit hook, no abort hook, no cleanup.
1811 void os::die() {
1812 _exit(-1);
1813 }
1814
1815 // unused
1816 void os::set_error_file(const char *logfile) {}
1817
1818 // DLL functions
1819
1820 const char* os::dll_file_extension() { return ".so"; }
1821
1822 const char* os::get_temp_directory() {
1823 const char *prop = Arguments::get_property("java.io.tmpdir");
1824 return prop == NULL ? "/tmp" : prop;
1825 }
1826
1827 static bool file_exists(const char* filename) {
1828 struct stat statbuf;
1829 if (filename == NULL || strlen(filename) == 0) {
1830 return false;
1831 }
1832 return os::stat(filename, &statbuf) == 0;
1833 }
1834
1835 void os::dll_build_name(char* buffer, size_t buflen,
1836 const char* pname, const char* fname) {
1837 // Copied from libhpi
1838 const size_t pnamelen = pname ? strlen(pname) : 0;
1839
1840 // Quietly truncate on buffer overflow. Should be an error.
1841 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1842 *buffer = '\0';
1843 return;
1844 }
1845
1846 if (pnamelen == 0) {
1847 snprintf(buffer, buflen, "lib%s.so", fname);
1848 } else if (strchr(pname, *os::path_separator()) != NULL) {
1849 int n;
1850 char** pelements = split_path(pname, &n);
1851 for (int i = 0 ; i < n ; i++) {
1852 // really shouldn't be NULL but what the heck, check can't hurt
1853 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1854 continue; // skip the empty path values
1855 }
1856 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1857 if (file_exists(buffer)) {
1858 break;
1859 }
1860 }
1861 // release the storage
1862 for (int i = 0 ; i < n ; i++) {
1863 if (pelements[i] != NULL) {
1864 FREE_C_HEAP_ARRAY(char, pelements[i]);
1865 }
1866 }
1867 if (pelements != NULL) {
1868 FREE_C_HEAP_ARRAY(char*, pelements);
1869 }
1870 } else {
1871 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1872 }
1873 }
1874
1875 const char* os::get_current_directory(char *buf, int buflen) {
1876 return getcwd(buf, buflen);
1877 }
1878
1879 // check if addr is inside libjvm[_g].so
1880 bool os::address_is_in_vm(address addr) {
1881 static address libjvm_base_addr;
1882 Dl_info dlinfo;
1883
1884 if (libjvm_base_addr == NULL) {
1885 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1886 libjvm_base_addr = (address)dlinfo.dli_fbase;
1887 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1888 }
1889
1890 if (dladdr((void *)addr, &dlinfo)) {
1891 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1892 }
1893
1894 return false;
1895 }
1896
1897 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1898 static dladdr1_func_type dladdr1_func = NULL;
1899
1900 bool os::dll_address_to_function_name(address addr, char *buf,
1901 int buflen, int * offset) {
1902 Dl_info dlinfo;
1903
1904 // dladdr1_func was initialized in os::init()
1905 if (dladdr1_func){
1906 // yes, we have dladdr1
1907
1908 // Support for dladdr1 is checked at runtime; it may be
1909 // available even if the vm is built on a machine that does
1910 // not have dladdr1 support. Make sure there is a value for
1911 // RTLD_DL_SYMENT.
1912 #ifndef RTLD_DL_SYMENT
1913 #define RTLD_DL_SYMENT 1
1914 #endif
1915 Sym * info;
1916 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1917 RTLD_DL_SYMENT)) {
1918 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1919 if (offset) *offset = addr - (address)dlinfo.dli_saddr;
1920
1921 // check if the returned symbol really covers addr
1922 return ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr);
1923 } else {
1924 if (buf) buf[0] = '\0';
1925 if (offset) *offset = -1;
1926 return false;
1927 }
1928 } else {
1929 // no, only dladdr is available
1930 if(dladdr((void *)addr, &dlinfo)) {
1931 if (buf) jio_snprintf(buf, buflen, dlinfo.dli_sname);
1932 if (offset) *offset = addr - (address)dlinfo.dli_saddr;
1933 return true;
1934 } else {
1935 if (buf) buf[0] = '\0';
1936 if (offset) *offset = -1;
1937 return false;
1938 }
1939 }
1940 }
1941
1942 bool os::dll_address_to_library_name(address addr, char* buf,
1943 int buflen, int* offset) {
1944 Dl_info dlinfo;
1945
1946 if (dladdr((void*)addr, &dlinfo)){
1947 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1948 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
1949 return true;
1950 } else {
1951 if (buf) buf[0] = '\0';
1952 if (offset) *offset = -1;
1953 return false;
1954 }
1955 }
1956
1957 // Prints the names and full paths of all opened dynamic libraries
1958 // for current process
1959 void os::print_dll_info(outputStream * st) {
1960 Dl_info dli;
1961 void *handle;
1962 Link_map *map;
1963 Link_map *p;
1964
1965 st->print_cr("Dynamic libraries:"); st->flush();
1966
1967 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
1968 st->print_cr("Error: Cannot print dynamic libraries.");
1969 return;
1970 }
1971 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1972 if (handle == NULL) {
1973 st->print_cr("Error: Cannot print dynamic libraries.");
1974 return;
1975 }
1976 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1977 if (map == NULL) {
1978 st->print_cr("Error: Cannot print dynamic libraries.");
1979 return;
1980 }
1981
1982 while (map->l_prev != NULL)
1983 map = map->l_prev;
1984
1985 while (map != NULL) {
1986 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1987 map = map->l_next;
1988 }
1989
1990 dlclose(handle);
1991 }
1992
1993 // Loads .dll/.so and
1994 // in case of error it checks if .dll/.so was built for the
1995 // same architecture as Hotspot is running on
1996
1997 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1998 {
1999 void * result= ::dlopen(filename, RTLD_LAZY);
2000 if (result != NULL) {
2001 // Successful loading
2002 return result;
2003 }
2004
2005 Elf32_Ehdr elf_head;
2006
2007 // Read system error message into ebuf
2008 // It may or may not be overwritten below
2009 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2010 ebuf[ebuflen-1]='\0';
2011 int diag_msg_max_length=ebuflen-strlen(ebuf);
2012 char* diag_msg_buf=ebuf+strlen(ebuf);
2013
2014 if (diag_msg_max_length==0) {
2015 // No more space in ebuf for additional diagnostics message
2016 return NULL;
2017 }
2018
2019
2020 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2021
2022 if (file_descriptor < 0) {
2023 // Can't open library, report dlerror() message
2024 return NULL;
2025 }
2026
2027 bool failed_to_read_elf_head=
2028 (sizeof(elf_head)!=
2029 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2030
2031 ::close(file_descriptor);
2032 if (failed_to_read_elf_head) {
2033 // file i/o error - report dlerror() msg
2034 return NULL;
2035 }
2036
2037 typedef struct {
2038 Elf32_Half code; // Actual value as defined in elf.h
2039 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2040 char elf_class; // 32 or 64 bit
2041 char endianess; // MSB or LSB
2042 char* name; // String representation
2043 } arch_t;
2044
2045 static const arch_t arch_array[]={
2046 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2047 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2048 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2049 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2050 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2051 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2052 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2053 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2054 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2055 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2056 };
2057
2058 #if (defined IA32)
2059 static Elf32_Half running_arch_code=EM_386;
2060 #elif (defined AMD64)
2061 static Elf32_Half running_arch_code=EM_X86_64;
2062 #elif (defined IA64)
2063 static Elf32_Half running_arch_code=EM_IA_64;
2064 #elif (defined __sparc) && (defined _LP64)
2065 static Elf32_Half running_arch_code=EM_SPARCV9;
2066 #elif (defined __sparc) && (!defined _LP64)
2067 static Elf32_Half running_arch_code=EM_SPARC;
2068 #elif (defined __powerpc64__)
2069 static Elf32_Half running_arch_code=EM_PPC64;
2070 #elif (defined __powerpc__)
2071 static Elf32_Half running_arch_code=EM_PPC;
2072 #elif (defined ARM)
2073 static Elf32_Half running_arch_code=EM_ARM;
2074 #else
2075 #error Method os::dll_load requires that one of following is defined:\
2076 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2077 #endif
2078
2079 // Identify compatability class for VM's architecture and library's architecture
2080 // Obtain string descriptions for architectures
2081
2082 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2083 int running_arch_index=-1;
2084
2085 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2086 if (running_arch_code == arch_array[i].code) {
2087 running_arch_index = i;
2088 }
2089 if (lib_arch.code == arch_array[i].code) {
2090 lib_arch.compat_class = arch_array[i].compat_class;
2091 lib_arch.name = arch_array[i].name;
2092 }
2093 }
2094
2095 assert(running_arch_index != -1,
2096 "Didn't find running architecture code (running_arch_code) in arch_array");
2097 if (running_arch_index == -1) {
2098 // Even though running architecture detection failed
2099 // we may still continue with reporting dlerror() message
2100 return NULL;
2101 }
2102
2103 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2104 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2105 return NULL;
2106 }
2107
2108 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2109 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2110 return NULL;
2111 }
2112
2113 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2114 if ( lib_arch.name!=NULL ) {
2115 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2116 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2117 lib_arch.name, arch_array[running_arch_index].name);
2118 } else {
2119 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2120 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2121 lib_arch.code,
2122 arch_array[running_arch_index].name);
2123 }
2124 }
2125
2126 return NULL;
2127 }
2128
2129 void* os::dll_lookup(void* handle, const char* name) {
2130 return dlsym(handle, name);
2131 }
2132
2133
2134 bool _print_ascii_file(const char* filename, outputStream* st) {
2135 int fd = open(filename, O_RDONLY);
2136 if (fd == -1) {
2137 return false;
2138 }
2139
2140 char buf[32];
2141 int bytes;
2142 while ((bytes = read(fd, buf, sizeof(buf))) > 0) {
2143 st->print_raw(buf, bytes);
2144 }
2145
2146 close(fd);
2147
2148 return true;
2149 }
2150
2151 void os::print_os_info(outputStream* st) {
2152 st->print("OS:");
2153
2154 if (!_print_ascii_file("/etc/release", st)) {
2155 st->print("Solaris");
2156 }
2157 st->cr();
2158
2159 // kernel
2160 st->print("uname:");
2161 struct utsname name;
2162 uname(&name);
2163 st->print(name.sysname); st->print(" ");
2164 st->print(name.release); st->print(" ");
2165 st->print(name.version); st->print(" ");
2166 st->print(name.machine);
2167
2168 // libthread
2169 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)");
2170 else st->print(" (T1 libthread)");
2171 st->cr();
2172
2173 // rlimit
2174 st->print("rlimit:");
2175 struct rlimit rlim;
2176
2177 st->print(" STACK ");
2178 getrlimit(RLIMIT_STACK, &rlim);
2179 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2180 else st->print("%uk", rlim.rlim_cur >> 10);
2181
2182 st->print(", CORE ");
2183 getrlimit(RLIMIT_CORE, &rlim);
2184 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2185 else st->print("%uk", rlim.rlim_cur >> 10);
2186
2187 st->print(", NOFILE ");
2188 getrlimit(RLIMIT_NOFILE, &rlim);
2189 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2190 else st->print("%d", rlim.rlim_cur);
2191
2192 st->print(", AS ");
2193 getrlimit(RLIMIT_AS, &rlim);
2194 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2195 else st->print("%uk", rlim.rlim_cur >> 10);
2196 st->cr();
2197
2198 // load average
2199 st->print("load average:");
2200 double loadavg[3];
2201 os::loadavg(loadavg, 3);
2202 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
2203 st->cr();
2204 }
2205
2206
2207 static bool check_addr0(outputStream* st) {
2208 jboolean status = false;
2209 int fd = open("/proc/self/map",O_RDONLY);
2210 if (fd >= 0) {
2211 prmap_t p;
2212 while(read(fd, &p, sizeof(p)) > 0) {
2213 if (p.pr_vaddr == 0x0) {
2214 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2215 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2216 st->print("Access:");
2217 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2218 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2219 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2220 st->cr();
2221 status = true;
2222 }
2223 close(fd);
2224 }
2225 }
2226 return status;
2227 }
2228
2229 void os::print_memory_info(outputStream* st) {
2230 st->print("Memory:");
2231 st->print(" %dk page", os::vm_page_size()>>10);
2232 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2233 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2234 st->cr();
2235 (void) check_addr0(st);
2236 }
2237
2238 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2239 // but they're the same for all the solaris architectures that we support.
2240 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2241 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2242 "ILL_COPROC", "ILL_BADSTK" };
2243
2244 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2245 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2246 "FPE_FLTINV", "FPE_FLTSUB" };
2247
2248 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2249
2250 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2251
2252 void os::print_siginfo(outputStream* st, void* siginfo) {
2253 st->print("siginfo:");
2254
2255 const int buflen = 100;
2256 char buf[buflen];
2257 siginfo_t *si = (siginfo_t*)siginfo;
2258 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2259 char *err = strerror(si->si_errno);
2260 if (si->si_errno != 0 && err != NULL) {
2261 st->print("si_errno=%s", err);
2262 } else {
2263 st->print("si_errno=%d", si->si_errno);
2264 }
2265 const int c = si->si_code;
2266 assert(c > 0, "unexpected si_code");
2267 switch (si->si_signo) {
2268 case SIGILL:
2269 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2270 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2271 break;
2272 case SIGFPE:
2273 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2274 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2275 break;
2276 case SIGSEGV:
2277 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2278 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2279 break;
2280 case SIGBUS:
2281 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2282 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2283 break;
2284 default:
2285 st->print(", si_code=%d", si->si_code);
2286 // no si_addr
2287 }
2288
2289 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2290 UseSharedSpaces) {
2291 FileMapInfo* mapinfo = FileMapInfo::current_info();
2292 if (mapinfo->is_in_shared_space(si->si_addr)) {
2293 st->print("\n\nError accessing class data sharing archive." \
2294 " Mapped file inaccessible during execution, " \
2295 " possible disk/network problem.");
2296 }
2297 }
2298 st->cr();
2299 }
2300
2301 // Moved from whole group, because we need them here for diagnostic
2302 // prints.
2303 #define OLDMAXSIGNUM 32
2304 static int Maxsignum = 0;
2305 static int *ourSigFlags = NULL;
2306
2307 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2308
2309 int os::Solaris::get_our_sigflags(int sig) {
2310 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2311 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2312 return ourSigFlags[sig];
2313 }
2314
2315 void os::Solaris::set_our_sigflags(int sig, int flags) {
2316 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2317 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2318 ourSigFlags[sig] = flags;
2319 }
2320
2321
2322 static const char* get_signal_handler_name(address handler,
2323 char* buf, int buflen) {
2324 int offset;
2325 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2326 if (found) {
2327 // skip directory names
2328 const char *p1, *p2;
2329 p1 = buf;
2330 size_t len = strlen(os::file_separator());
2331 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2332 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2333 } else {
2334 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2335 }
2336 return buf;
2337 }
2338
2339 static void print_signal_handler(outputStream* st, int sig,
2340 char* buf, size_t buflen) {
2341 struct sigaction sa;
2342
2343 sigaction(sig, NULL, &sa);
2344
2345 st->print("%s: ", os::exception_name(sig, buf, buflen));
2346
2347 address handler = (sa.sa_flags & SA_SIGINFO)
2348 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2349 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2350
2351 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2352 st->print("SIG_DFL");
2353 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2354 st->print("SIG_IGN");
2355 } else {
2356 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2357 }
2358
2359 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2360
2361 address rh = VMError::get_resetted_sighandler(sig);
2362 // May be, handler was resetted by VMError?
2363 if(rh != NULL) {
2364 handler = rh;
2365 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2366 }
2367
2368 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2369
2370 // Check: is it our handler?
2371 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2372 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2373 // It is our signal handler
2374 // check for flags
2375 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2376 st->print(
2377 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2378 os::Solaris::get_our_sigflags(sig));
2379 }
2380 }
2381 st->cr();
2382 }
2383
2384 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2385 st->print_cr("Signal Handlers:");
2386 print_signal_handler(st, SIGSEGV, buf, buflen);
2387 print_signal_handler(st, SIGBUS , buf, buflen);
2388 print_signal_handler(st, SIGFPE , buf, buflen);
2389 print_signal_handler(st, SIGPIPE, buf, buflen);
2390 print_signal_handler(st, SIGXFSZ, buf, buflen);
2391 print_signal_handler(st, SIGILL , buf, buflen);
2392 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2393 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2394 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2395 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2396 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2397 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2398 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2399 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2400 }
2401
2402 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2403
2404 // Find the full path to the current module, libjvm.so or libjvm_g.so
2405 void os::jvm_path(char *buf, jint buflen) {
2406 // Error checking.
2407 if (buflen < MAXPATHLEN) {
2408 assert(false, "must use a large-enough buffer");
2409 buf[0] = '\0';
2410 return;
2411 }
2412 // Lazy resolve the path to current module.
2413 if (saved_jvm_path[0] != 0) {
2414 strcpy(buf, saved_jvm_path);
2415 return;
2416 }
2417
2418 Dl_info dlinfo;
2419 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2420 assert(ret != 0, "cannot locate libjvm");
2421 realpath((char *)dlinfo.dli_fname, buf);
2422
2423 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) {
2424 // Support for the gamma launcher. Typical value for buf is
2425 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2426 // the right place in the string, then assume we are installed in a JDK and
2427 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2428 // up the path so it looks like libjvm.so is installed there (append a
2429 // fake suffix hotspot/libjvm.so).
2430 const char *p = buf + strlen(buf) - 1;
2431 for (int count = 0; p > buf && count < 5; ++count) {
2432 for (--p; p > buf && *p != '/'; --p)
2433 /* empty */ ;
2434 }
2435
2436 if (strncmp(p, "/jre/lib/", 9) != 0) {
2437 // Look for JAVA_HOME in the environment.
2438 char* java_home_var = ::getenv("JAVA_HOME");
2439 if (java_home_var != NULL && java_home_var[0] != 0) {
2440 char cpu_arch[12];
2441 char* jrelib_p;
2442 int len;
2443 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2444 #ifdef _LP64
2445 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2446 if (strcmp(cpu_arch, "sparc") == 0) {
2447 strcat(cpu_arch, "v9");
2448 } else if (strcmp(cpu_arch, "i386") == 0) {
2449 strcpy(cpu_arch, "amd64");
2450 }
2451 #endif
2452 // Check the current module name "libjvm.so" or "libjvm_g.so".
2453 p = strrchr(buf, '/');
2454 assert(strstr(p, "/libjvm") == p, "invalid library name");
2455 p = strstr(p, "_g") ? "_g" : "";
2456
2457 realpath(java_home_var, buf);
2458 // determine if this is a legacy image or modules image
2459 // modules image doesn't have "jre" subdirectory
2460 len = strlen(buf);
2461 jrelib_p = buf + len;
2462 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2463 if (0 != access(buf, F_OK)) {
2464 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2465 }
2466
2467 if (0 == access(buf, F_OK)) {
2468 // Use current module name "libjvm[_g].so" instead of
2469 // "libjvm"debug_only("_g")".so" since for fastdebug version
2470 // we should have "libjvm.so" but debug_only("_g") adds "_g"!
2471 // It is used when we are choosing the HPI library's name
2472 // "libhpi[_g].so" in hpi::initialize_get_interface().
2473 len = strlen(buf);
2474 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p);
2475 } else {
2476 // Go back to path of .so
2477 realpath((char *)dlinfo.dli_fname, buf);
2478 }
2479 }
2480 }
2481 }
2482
2483 strcpy(saved_jvm_path, buf);
2484 }
2485
2486
2487 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2488 // no prefix required, not even "_"
2489 }
2490
2491
2492 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2493 // no suffix required
2494 }
2495
2496
2497 // sun.misc.Signal
2498
2499 extern "C" {
2500 static void UserHandler(int sig, void *siginfo, void *context) {
2501 // Ctrl-C is pressed during error reporting, likely because the error
2502 // handler fails to abort. Let VM die immediately.
2503 if (sig == SIGINT && is_error_reported()) {
2504 os::die();
2505 }
2506
2507 os::signal_notify(sig);
2508 // We do not need to reinstate the signal handler each time...
2509 }
2510 }
2511
2512 void* os::user_handler() {
2513 return CAST_FROM_FN_PTR(void*, UserHandler);
2514 }
2515
2516 extern "C" {
2517 typedef void (*sa_handler_t)(int);
2518 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2519 }
2520
2521 void* os::signal(int signal_number, void* handler) {
2522 struct sigaction sigAct, oldSigAct;
2523 sigfillset(&(sigAct.sa_mask));
2524 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2525 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2526
2527 if (sigaction(signal_number, &sigAct, &oldSigAct))
2528 // -1 means registration failed
2529 return (void *)-1;
2530
2531 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2532 }
2533
2534 void os::signal_raise(int signal_number) {
2535 raise(signal_number);
2536 }
2537
2538 /*
2539 * The following code is moved from os.cpp for making this
2540 * code platform specific, which it is by its very nature.
2541 */
2542
2543 // a counter for each possible signal value
2544 static int Sigexit = 0;
2545 static int Maxlibjsigsigs;
2546 static jint *pending_signals = NULL;
2547 static int *preinstalled_sigs = NULL;
2548 static struct sigaction *chainedsigactions = NULL;
2549 static sema_t sig_sem;
2550 typedef int (*version_getting_t)();
2551 version_getting_t os::Solaris::get_libjsig_version = NULL;
2552 static int libjsigversion = NULL;
2553
2554 int os::sigexitnum_pd() {
2555 assert(Sigexit > 0, "signal memory not yet initialized");
2556 return Sigexit;
2557 }
2558
2559 void os::Solaris::init_signal_mem() {
2560 // Initialize signal structures
2561 Maxsignum = SIGRTMAX;
2562 Sigexit = Maxsignum+1;
2563 assert(Maxsignum >0, "Unable to obtain max signal number");
2564
2565 Maxlibjsigsigs = Maxsignum;
2566
2567 // pending_signals has one int per signal
2568 // The additional signal is for SIGEXIT - exit signal to signal_thread
2569 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1));
2570 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2571
2572 if (UseSignalChaining) {
2573 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2574 * (Maxsignum + 1));
2575 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2576 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1));
2577 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2578 }
2579 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ));
2580 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2581 }
2582
2583 void os::signal_init_pd() {
2584 int ret;
2585
2586 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2587 assert(ret == 0, "sema_init() failed");
2588 }
2589
2590 void os::signal_notify(int signal_number) {
2591 int ret;
2592
2593 Atomic::inc(&pending_signals[signal_number]);
2594 ret = ::sema_post(&sig_sem);
2595 assert(ret == 0, "sema_post() failed");
2596 }
2597
2598 static int check_pending_signals(bool wait_for_signal) {
2599 int ret;
2600 while (true) {
2601 for (int i = 0; i < Sigexit + 1; i++) {
2602 jint n = pending_signals[i];
2603 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2604 return i;
2605 }
2606 }
2607 if (!wait_for_signal) {
2608 return -1;
2609 }
2610 JavaThread *thread = JavaThread::current();
2611 ThreadBlockInVM tbivm(thread);
2612
2613 bool threadIsSuspended;
2614 do {
2615 thread->set_suspend_equivalent();
2616 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2617 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2618 ;
2619 assert(ret == 0, "sema_wait() failed");
2620
2621 // were we externally suspended while we were waiting?
2622 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2623 if (threadIsSuspended) {
2624 //
2625 // The semaphore has been incremented, but while we were waiting
2626 // another thread suspended us. We don't want to continue running
2627 // while suspended because that would surprise the thread that
2628 // suspended us.
2629 //
2630 ret = ::sema_post(&sig_sem);
2631 assert(ret == 0, "sema_post() failed");
2632
2633 thread->java_suspend_self();
2634 }
2635 } while (threadIsSuspended);
2636 }
2637 }
2638
2639 int os::signal_lookup() {
2640 return check_pending_signals(false);
2641 }
2642
2643 int os::signal_wait() {
2644 return check_pending_signals(true);
2645 }
2646
2647 ////////////////////////////////////////////////////////////////////////////////
2648 // Virtual Memory
2649
2650 static int page_size = -1;
2651
2652 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2653 // clear this var if support is not available.
2654 static bool has_map_align = true;
2655
2656 int os::vm_page_size() {
2657 assert(page_size != -1, "must call os::init");
2658 return page_size;
2659 }
2660
2661 // Solaris allocates memory by pages.
2662 int os::vm_allocation_granularity() {
2663 assert(page_size != -1, "must call os::init");
2664 return page_size;
2665 }
2666
2667 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2668 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2669 size_t size = bytes;
2670 return
2671 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2672 }
2673
2674 bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2675 bool exec) {
2676 if (commit_memory(addr, bytes, exec)) {
2677 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2678 // If the large page size has been set and the VM
2679 // is using large pages, use the large page size
2680 // if it is smaller than the alignment hint. This is
2681 // a case where the VM wants to use a larger alignment size
2682 // for its own reasons but still want to use large pages
2683 // (which is what matters to setting the mpss range.
2684 size_t page_size = 0;
2685 if (large_page_size() < alignment_hint) {
2686 assert(UseLargePages, "Expected to be here for large page use only");
2687 page_size = large_page_size();
2688 } else {
2689 // If the alignment hint is less than the large page
2690 // size, the VM wants a particular alignment (thus the hint)
2691 // for internal reasons. Try to set the mpss range using
2692 // the alignment_hint.
2693 page_size = alignment_hint;
2694 }
2695 // Since this is a hint, ignore any failures.
2696 (void)Solaris::set_mpss_range(addr, bytes, page_size);
2697 }
2698 return true;
2699 }
2700 return false;
2701 }
2702
2703 // Uncommit the pages in a specified region.
2704 void os::free_memory(char* addr, size_t bytes) {
2705 if (madvise(addr, bytes, MADV_FREE) < 0) {
2706 debug_only(warning("MADV_FREE failed."));
2707 return;
2708 }
2709 }
2710
2711 bool os::create_stack_guard_pages(char* addr, size_t size) {
2712 return os::commit_memory(addr, size);
2713 }
2714
2715 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2716 return os::uncommit_memory(addr, size);
2717 }
2718
2719 // Change the page size in a given range.
2720 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2721 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2722 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2723 Solaris::set_mpss_range(addr, bytes, alignment_hint);
2724 }
2725
2726 // Tell the OS to make the range local to the first-touching LWP
2727 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2728 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2729 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2730 debug_only(warning("MADV_ACCESS_LWP failed."));
2731 }
2732 }
2733
2734 // Tell the OS that this range would be accessed from different LWPs.
2735 void os::numa_make_global(char *addr, size_t bytes) {
2736 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2737 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2738 debug_only(warning("MADV_ACCESS_MANY failed."));
2739 }
2740 }
2741
2742 // Get the number of the locality groups.
2743 size_t os::numa_get_groups_num() {
2744 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2745 return n != -1 ? n : 1;
2746 }
2747
2748 // Get a list of leaf locality groups. A leaf lgroup is group that
2749 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2750 // board. An LWP is assigned to one of these groups upon creation.
2751 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2752 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2753 ids[0] = 0;
2754 return 1;
2755 }
2756 int result_size = 0, top = 1, bottom = 0, cur = 0;
2757 for (int k = 0; k < size; k++) {
2758 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2759 (Solaris::lgrp_id_t*)&ids[top], size - top);
2760 if (r == -1) {
2761 ids[0] = 0;
2762 return 1;
2763 }
2764 if (!r) {
2765 // That's a leaf node.
2766 assert (bottom <= cur, "Sanity check");
2767 // Check if the node has memory
2768 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2769 NULL, 0, LGRP_RSRC_MEM) > 0) {
2770 ids[bottom++] = ids[cur];
2771 }
2772 }
2773 top += r;
2774 cur++;
2775 }
2776 if (bottom == 0) {
2777 // Handle a situation, when the OS reports no memory available.
2778 // Assume UMA architecture.
2779 ids[0] = 0;
2780 return 1;
2781 }
2782 return bottom;
2783 }
2784
2785 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2786 bool os::numa_topology_changed() {
2787 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2788 if (is_stale != -1 && is_stale) {
2789 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2790 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2791 assert(c != 0, "Failure to initialize LGRP API");
2792 Solaris::set_lgrp_cookie(c);
2793 return true;
2794 }
2795 return false;
2796 }
2797
2798 // Get the group id of the current LWP.
2799 int os::numa_get_group_id() {
2800 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2801 if (lgrp_id == -1) {
2802 return 0;
2803 }
2804 const int size = os::numa_get_groups_num();
2805 int *ids = (int*)alloca(size * sizeof(int));
2806
2807 // Get the ids of all lgroups with memory; r is the count.
2808 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2809 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2810 if (r <= 0) {
2811 return 0;
2812 }
2813 return ids[os::random() % r];
2814 }
2815
2816 // Request information about the page.
2817 bool os::get_page_info(char *start, page_info* info) {
2818 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2819 uint64_t addr = (uintptr_t)start;
2820 uint64_t outdata[2];
2821 uint_t validity = 0;
2822
2823 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2824 return false;
2825 }
2826
2827 info->size = 0;
2828 info->lgrp_id = -1;
2829
2830 if ((validity & 1) != 0) {
2831 if ((validity & 2) != 0) {
2832 info->lgrp_id = outdata[0];
2833 }
2834 if ((validity & 4) != 0) {
2835 info->size = outdata[1];
2836 }
2837 return true;
2838 }
2839 return false;
2840 }
2841
2842 // Scan the pages from start to end until a page different than
2843 // the one described in the info parameter is encountered.
2844 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2845 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2846 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2847 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2848 uint_t validity[MAX_MEMINFO_CNT];
2849
2850 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2851 uint64_t p = (uint64_t)start;
2852 while (p < (uint64_t)end) {
2853 addrs[0] = p;
2854 size_t addrs_count = 1;
2855 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) {
2856 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2857 addrs_count++;
2858 }
2859
2860 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2861 return NULL;
2862 }
2863
2864 size_t i = 0;
2865 for (; i < addrs_count; i++) {
2866 if ((validity[i] & 1) != 0) {
2867 if ((validity[i] & 4) != 0) {
2868 if (outdata[types * i + 1] != page_expected->size) {
2869 break;
2870 }
2871 } else
2872 if (page_expected->size != 0) {
2873 break;
2874 }
2875
2876 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2877 if (outdata[types * i] != page_expected->lgrp_id) {
2878 break;
2879 }
2880 }
2881 } else {
2882 return NULL;
2883 }
2884 }
2885
2886 if (i != addrs_count) {
2887 if ((validity[i] & 2) != 0) {
2888 page_found->lgrp_id = outdata[types * i];
2889 } else {
2890 page_found->lgrp_id = -1;
2891 }
2892 if ((validity[i] & 4) != 0) {
2893 page_found->size = outdata[types * i + 1];
2894 } else {
2895 page_found->size = 0;
2896 }
2897 return (char*)addrs[i];
2898 }
2899
2900 p = addrs[addrs_count - 1] + page_size;
2901 }
2902 return end;
2903 }
2904
2905 bool os::uncommit_memory(char* addr, size_t bytes) {
2906 size_t size = bytes;
2907 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2908 // uncommitted page. Otherwise, the read/write might succeed if we
2909 // have enough swap space to back the physical page.
2910 return
2911 NULL != Solaris::mmap_chunk(addr, size,
2912 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2913 PROT_NONE);
2914 }
2915
2916 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2917 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2918
2919 if (b == MAP_FAILED) {
2920 return NULL;
2921 }
2922 return b;
2923 }
2924
2925 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2926 char* addr = requested_addr;
2927 int flags = MAP_PRIVATE | MAP_NORESERVE;
2928
2929 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2930
2931 if (fixed) {
2932 flags |= MAP_FIXED;
2933 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2934 flags |= MAP_ALIGN;
2935 addr = (char*) alignment_hint;
2936 }
2937
2938 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2939 // uncommitted page. Otherwise, the read/write might succeed if we
2940 // have enough swap space to back the physical page.
2941 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2942 }
2943
2944 char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2945 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2946
2947 guarantee(requested_addr == NULL || requested_addr == addr,
2948 "OS failed to return requested mmap address.");
2949 return addr;
2950 }
2951
2952 // Reserve memory at an arbitrary address, only if that area is
2953 // available (and not reserved for something else).
2954
2955 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2956 const int max_tries = 10;
2957 char* base[max_tries];
2958 size_t size[max_tries];
2959
2960 // Solaris adds a gap between mmap'ed regions. The size of the gap
2961 // is dependent on the requested size and the MMU. Our initial gap
2962 // value here is just a guess and will be corrected later.
2963 bool had_top_overlap = false;
2964 bool have_adjusted_gap = false;
2965 size_t gap = 0x400000;
2966
2967 // Assert only that the size is a multiple of the page size, since
2968 // that's all that mmap requires, and since that's all we really know
2969 // about at this low abstraction level. If we need higher alignment,
2970 // we can either pass an alignment to this method or verify alignment
2971 // in one of the methods further up the call chain. See bug 5044738.
2972 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2973
2974 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2975 // Give it a try, if the kernel honors the hint we can return immediately.
2976 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2977 volatile int err = errno;
2978 if (addr == requested_addr) {
2979 return addr;
2980 } else if (addr != NULL) {
2981 unmap_memory(addr, bytes);
2982 }
2983
2984 if (PrintMiscellaneous && Verbose) {
2985 char buf[256];
2986 buf[0] = '\0';
2987 if (addr == NULL) {
2988 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2989 }
2990 warning("attempt_reserve_memory_at: couldn't reserve %d bytes at "
2991 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2992 "%s", bytes, requested_addr, addr, buf);
2993 }
2994
2995 // Address hint method didn't work. Fall back to the old method.
2996 // In theory, once SNV becomes our oldest supported platform, this
2997 // code will no longer be needed.
2998 //
2999 // Repeatedly allocate blocks until the block is allocated at the
3000 // right spot. Give up after max_tries.
3001 int i;
3002 for (i = 0; i < max_tries; ++i) {
3003 base[i] = reserve_memory(bytes);
3004
3005 if (base[i] != NULL) {
3006 // Is this the block we wanted?
3007 if (base[i] == requested_addr) {
3008 size[i] = bytes;
3009 break;
3010 }
3011
3012 // check that the gap value is right
3013 if (had_top_overlap && !have_adjusted_gap) {
3014 size_t actual_gap = base[i-1] - base[i] - bytes;
3015 if (gap != actual_gap) {
3016 // adjust the gap value and retry the last 2 allocations
3017 assert(i > 0, "gap adjustment code problem");
3018 have_adjusted_gap = true; // adjust the gap only once, just in case
3019 gap = actual_gap;
3020 if (PrintMiscellaneous && Verbose) {
3021 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3022 }
3023 unmap_memory(base[i], bytes);
3024 unmap_memory(base[i-1], size[i-1]);
3025 i-=2;
3026 continue;
3027 }
3028 }
3029
3030 // Does this overlap the block we wanted? Give back the overlapped
3031 // parts and try again.
3032 //
3033 // There is still a bug in this code: if top_overlap == bytes,
3034 // the overlap is offset from requested region by the value of gap.
3035 // In this case giving back the overlapped part will not work,
3036 // because we'll give back the entire block at base[i] and
3037 // therefore the subsequent allocation will not generate a new gap.
3038 // This could be fixed with a new algorithm that used larger
3039 // or variable size chunks to find the requested region -
3040 // but such a change would introduce additional complications.
3041 // It's rare enough that the planets align for this bug,
3042 // so we'll just wait for a fix for 6204603/5003415 which
3043 // will provide a mmap flag to allow us to avoid this business.
3044
3045 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3046 if (top_overlap >= 0 && top_overlap < bytes) {
3047 had_top_overlap = true;
3048 unmap_memory(base[i], top_overlap);
3049 base[i] += top_overlap;
3050 size[i] = bytes - top_overlap;
3051 } else {
3052 size_t bottom_overlap = base[i] + bytes - requested_addr;
3053 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3054 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3055 warning("attempt_reserve_memory_at: possible alignment bug");
3056 }
3057 unmap_memory(requested_addr, bottom_overlap);
3058 size[i] = bytes - bottom_overlap;
3059 } else {
3060 size[i] = bytes;
3061 }
3062 }
3063 }
3064 }
3065
3066 // Give back the unused reserved pieces.
3067
3068 for (int j = 0; j < i; ++j) {
3069 if (base[j] != NULL) {
3070 unmap_memory(base[j], size[j]);
3071 }
3072 }
3073
3074 return (i < max_tries) ? requested_addr : NULL;
3075 }
3076
3077 bool os::release_memory(char* addr, size_t bytes) {
3078 size_t size = bytes;
3079 return munmap(addr, size) == 0;
3080 }
3081
3082 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3083 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3084 "addr must be page aligned");
3085 int retVal = mprotect(addr, bytes, prot);
3086 return retVal == 0;
3087 }
3088
3089 // Protect memory (Used to pass readonly pages through
3090 // JNI GetArray<type>Elements with empty arrays.)
3091 // Also, used for serialization page and for compressed oops null pointer
3092 // checking.
3093 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3094 bool is_committed) {
3095 unsigned int p = 0;
3096 switch (prot) {
3097 case MEM_PROT_NONE: p = PROT_NONE; break;
3098 case MEM_PROT_READ: p = PROT_READ; break;
3099 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3100 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3101 default:
3102 ShouldNotReachHere();
3103 }
3104 // is_committed is unused.
3105 return solaris_mprotect(addr, bytes, p);
3106 }
3107
3108 // guard_memory and unguard_memory only happens within stack guard pages.
3109 // Since ISM pertains only to the heap, guard and unguard memory should not
3110 /// happen with an ISM region.
3111 bool os::guard_memory(char* addr, size_t bytes) {
3112 return solaris_mprotect(addr, bytes, PROT_NONE);
3113 }
3114
3115 bool os::unguard_memory(char* addr, size_t bytes) {
3116 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3117 }
3118
3119 // Large page support
3120
3121 // UseLargePages is the master flag to enable/disable large page memory.
3122 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3123 // effects can be described in the following table:
3124 //
3125 // UseLargePages UseMPSS UseISM
3126 // false * * => UseLargePages is the master switch, turning
3127 // it off will turn off both UseMPSS and
3128 // UseISM. VM will not use large page memory
3129 // regardless the settings of UseMPSS/UseISM.
3130 // true false false => Unless future Solaris provides other
3131 // mechanism to use large page memory, this
3132 // combination is equivalent to -UseLargePages,
3133 // VM will not use large page memory
3134 // true true false => JVM will use MPSS for large page memory.
3135 // This is the default behavior.
3136 // true false true => JVM will use ISM for large page memory.
3137 // true true true => JVM will use ISM if it is available.
3138 // Otherwise, JVM will fall back to MPSS.
3139 // Becaues ISM is now available on all
3140 // supported Solaris versions, this combination
3141 // is equivalent to +UseISM -UseMPSS.
3142
3143 typedef int (*getpagesizes_func_type) (size_t[], int);
3144 static size_t _large_page_size = 0;
3145
3146 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3147 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3148 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3149 // can support multiple page sizes.
3150
3151 // Don't bother to probe page size because getpagesizes() comes with MPSS.
3152 // ISM is only recommended on old Solaris where there is no MPSS support.
3153 // Simply choose a conservative value as default.
3154 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3155 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M)
3156 ARM_ONLY(2 * M);
3157
3158 // ISM is available on all supported Solaris versions
3159 return true;
3160 }
3161
3162 // Insertion sort for small arrays (descending order).
3163 static void insertion_sort_descending(size_t* array, int len) {
3164 for (int i = 0; i < len; i++) {
3165 size_t val = array[i];
3166 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3167 size_t tmp = array[key];
3168 array[key] = array[key - 1];
3169 array[key - 1] = tmp;
3170 }
3171 }
3172 }
3173
3174 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3175 getpagesizes_func_type getpagesizes_func =
3176 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes"));
3177 if (getpagesizes_func == NULL) {
3178 if (warn) {
3179 warning("MPSS is not supported by the operating system.");
3180 }
3181 return false;
3182 }
3183
3184 const unsigned int usable_count = VM_Version::page_size_count();
3185 if (usable_count == 1) {
3186 return false;
3187 }
3188
3189 // Fill the array of page sizes.
3190 int n = getpagesizes_func(_page_sizes, page_sizes_max);
3191 assert(n > 0, "Solaris bug?");
3192 if (n == page_sizes_max) {
3193 // Add a sentinel value (necessary only if the array was completely filled
3194 // since it is static (zeroed at initialization)).
3195 _page_sizes[--n] = 0;
3196 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3197 }
3198 assert(_page_sizes[n] == 0, "missing sentinel");
3199
3200 if (n == 1) return false; // Only one page size available.
3201
3202 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3203 // select up to usable_count elements. First sort the array, find the first
3204 // acceptable value, then copy the usable sizes to the top of the array and
3205 // trim the rest. Make sure to include the default page size :-).
3206 //
3207 // A better policy could get rid of the 4M limit by taking the sizes of the
3208 // important VM memory regions (java heap and possibly the code cache) into
3209 // account.
3210 insertion_sort_descending(_page_sizes, n);
3211 const size_t size_limit =
3212 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3213 int beg;
3214 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3215 const int end = MIN2((int)usable_count, n) - 1;
3216 for (int cur = 0; cur < end; ++cur, ++beg) {
3217 _page_sizes[cur] = _page_sizes[beg];
3218 }
3219 _page_sizes[end] = vm_page_size();
3220 _page_sizes[end + 1] = 0;
3221
3222 if (_page_sizes[end] > _page_sizes[end - 1]) {
3223 // Default page size is not the smallest; sort again.
3224 insertion_sort_descending(_page_sizes, end + 1);
3225 }
3226 *page_size = _page_sizes[0];
3227
3228 return true;
3229 }
3230
3231 bool os::large_page_init() {
3232 if (!UseLargePages) {
3233 UseISM = false;
3234 UseMPSS = false;
3235 return false;
3236 }
3237
3238 // print a warning if any large page related flag is specified on command line
3239 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3240 !FLAG_IS_DEFAULT(UseISM) ||
3241 !FLAG_IS_DEFAULT(UseMPSS) ||
3242 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3243 UseISM = UseISM &&
3244 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3245 if (UseISM) {
3246 // ISM disables MPSS to be compatible with old JDK behavior
3247 UseMPSS = false;
3248 _page_sizes[0] = _large_page_size;
3249 _page_sizes[1] = vm_page_size();
3250 }
3251
3252 UseMPSS = UseMPSS &&
3253 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3254
3255 UseLargePages = UseISM || UseMPSS;
3256 return UseLargePages;
3257 }
3258
3259 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3260 // Signal to OS that we want large pages for addresses
3261 // from addr, addr + bytes
3262 struct memcntl_mha mpss_struct;
3263 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3264 mpss_struct.mha_pagesize = align;
3265 mpss_struct.mha_flags = 0;
3266 if (memcntl(start, bytes, MC_HAT_ADVISE,
3267 (caddr_t) &mpss_struct, 0, 0) < 0) {
3268 debug_only(warning("Attempt to use MPSS failed."));
3269 return false;
3270 }
3271 return true;
3272 }
3273
3274 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3275 // "exec" is passed in but not used. Creating the shared image for
3276 // the code cache doesn't have an SHM_X executable permission to check.
3277 assert(UseLargePages && UseISM, "only for ISM large pages");
3278
3279 size_t size = bytes;
3280 char* retAddr = NULL;
3281 int shmid;
3282 key_t ismKey;
3283
3284 bool warn_on_failure = UseISM &&
3285 (!FLAG_IS_DEFAULT(UseLargePages) ||
3286 !FLAG_IS_DEFAULT(UseISM) ||
3287 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3288 );
3289 char msg[128];
3290
3291 ismKey = IPC_PRIVATE;
3292
3293 // Create a large shared memory region to attach to based on size.
3294 // Currently, size is the total size of the heap
3295 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3296 if (shmid == -1){
3297 if (warn_on_failure) {
3298 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3299 warning(msg);
3300 }
3301 return NULL;
3302 }
3303
3304 // Attach to the region
3305 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3306 int err = errno;
3307
3308 // Remove shmid. If shmat() is successful, the actual shared memory segment
3309 // will be deleted when it's detached by shmdt() or when the process
3310 // terminates. If shmat() is not successful this will remove the shared
3311 // segment immediately.
3312 shmctl(shmid, IPC_RMID, NULL);
3313
3314 if (retAddr == (char *) -1) {
3315 if (warn_on_failure) {
3316 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3317 warning(msg);
3318 }
3319 return NULL;
3320 }
3321
3322 return retAddr;
3323 }
3324
3325 bool os::release_memory_special(char* base, size_t bytes) {
3326 // detaching the SHM segment will also delete it, see reserve_memory_special()
3327 int rslt = shmdt(base);
3328 return rslt == 0;
3329 }
3330
3331 size_t os::large_page_size() {
3332 return _large_page_size;
3333 }
3334
3335 // MPSS allows application to commit large page memory on demand; with ISM
3336 // the entire memory region must be allocated as shared memory.
3337 bool os::can_commit_large_page_memory() {
3338 return UseISM ? false : true;
3339 }
3340
3341 bool os::can_execute_large_page_memory() {
3342 return UseISM ? false : true;
3343 }
3344
3345 static int os_sleep(jlong millis, bool interruptible) {
3346 const jlong limit = INT_MAX;
3347 jlong prevtime;
3348 int res;
3349
3350 while (millis > limit) {
3351 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3352 return res;
3353 millis -= limit;
3354 }
3355
3356 // Restart interrupted polls with new parameters until the proper delay
3357 // has been completed.
3358
3359 prevtime = getTimeMillis();
3360
3361 while (millis > 0) {
3362 jlong newtime;
3363
3364 if (!interruptible) {
3365 // Following assert fails for os::yield_all:
3366 // assert(!thread->is_Java_thread(), "must not be java thread");
3367 res = poll(NULL, 0, millis);
3368 } else {
3369 JavaThread *jt = JavaThread::current();
3370
3371 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3372 os::Solaris::clear_interrupted);
3373 }
3374
3375 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3376 // thread.Interrupt.
3377
3378 if((res == OS_ERR) && (errno == EINTR)) {
3379 newtime = getTimeMillis();
3380 assert(newtime >= prevtime, "time moving backwards");
3381 /* Doing prevtime and newtime in microseconds doesn't help precision,
3382 and trying to round up to avoid lost milliseconds can result in a
3383 too-short delay. */
3384 millis -= newtime - prevtime;
3385 if(millis <= 0)
3386 return OS_OK;
3387 prevtime = newtime;
3388 } else
3389 return res;
3390 }
3391
3392 return OS_OK;
3393 }
3394
3395 // Read calls from inside the vm need to perform state transitions
3396 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3397 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3398 }
3399
3400 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3401 assert(thread == Thread::current(), "thread consistency check");
3402
3403 // TODO-FIXME: this should be removed.
3404 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3405 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3406 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3407 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3408 // is fooled into believing that the system is making progress. In the code below we block the
3409 // the watcher thread while safepoint is in progress so that it would not appear as though the
3410 // system is making progress.
3411 if (!Solaris::T2_libthread() &&
3412 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3413 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3414 // the entire safepoint, the watcher thread will line up here during the safepoint.
3415 Threads_lock->lock_without_safepoint_check();
3416 Threads_lock->unlock();
3417 }
3418
3419 if (thread->is_Java_thread()) {
3420 // This is a JavaThread so we honor the _thread_blocked protocol
3421 // even for sleeps of 0 milliseconds. This was originally done
3422 // as a workaround for bug 4338139. However, now we also do it
3423 // to honor the suspend-equivalent protocol.
3424
3425 JavaThread *jt = (JavaThread *) thread;
3426 ThreadBlockInVM tbivm(jt);
3427
3428 jt->set_suspend_equivalent();
3429 // cleared by handle_special_suspend_equivalent_condition() or
3430 // java_suspend_self() via check_and_wait_while_suspended()
3431
3432 int ret_code;
3433 if (millis <= 0) {
3434 thr_yield();
3435 ret_code = 0;
3436 } else {
3437 // The original sleep() implementation did not create an
3438 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3439 // I'm preserving that decision for now.
3440 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3441
3442 ret_code = os_sleep(millis, interruptible);
3443 }
3444
3445 // were we externally suspended while we were waiting?
3446 jt->check_and_wait_while_suspended();
3447
3448 return ret_code;
3449 }
3450
3451 // non-JavaThread from this point on:
3452
3453 if (millis <= 0) {
3454 thr_yield();
3455 return 0;
3456 }
3457
3458 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3459
3460 return os_sleep(millis, interruptible);
3461 }
3462
3463 int os::naked_sleep() {
3464 // %% make the sleep time an integer flag. for now use 1 millisec.
3465 return os_sleep(1, false);
3466 }
3467
3468 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3469 void os::infinite_sleep() {
3470 while (true) { // sleep forever ...
3471 ::sleep(100); // ... 100 seconds at a time
3472 }
3473 }
3474
3475 // Used to convert frequent JVM_Yield() to nops
3476 bool os::dont_yield() {
3477 if (DontYieldALot) {
3478 static hrtime_t last_time = 0;
3479 hrtime_t diff = getTimeNanos() - last_time;
3480
3481 if (diff < DontYieldALotInterval * 1000000)
3482 return true;
3483
3484 last_time += diff;
3485
3486 return false;
3487 }
3488 else {
3489 return false;
3490 }
3491 }
3492
3493 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3494 // the linux and win32 implementations do not. This should be checked.
3495
3496 void os::yield() {
3497 // Yields to all threads with same or greater priority
3498 os::sleep(Thread::current(), 0, false);
3499 }
3500
3501 // Note that yield semantics are defined by the scheduling class to which
3502 // the thread currently belongs. Typically, yield will _not yield to
3503 // other equal or higher priority threads that reside on the dispatch queues
3504 // of other CPUs.
3505
3506 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3507
3508
3509 // On Solaris we found that yield_all doesn't always yield to all other threads.
3510 // There have been cases where there is a thread ready to execute but it doesn't
3511 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3512 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3513 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3514 // number of times yield_all is called in the one loop and increase the sleep
3515 // time after 8 attempts. If this fails too we increase the concurrency level
3516 // so that the starving thread would get an lwp
3517
3518 void os::yield_all(int attempts) {
3519 // Yields to all threads, including threads with lower priorities
3520 if (attempts == 0) {
3521 os::sleep(Thread::current(), 1, false);
3522 } else {
3523 int iterations = attempts % 30;
3524 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3525 // thr_setconcurrency and _getconcurrency make sense only under T1.
3526 int noofLWPS = thr_getconcurrency();
3527 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3528 thr_setconcurrency(thr_getconcurrency() + 1);
3529 }
3530 } else if (iterations < 25) {
3531 os::sleep(Thread::current(), 1, false);
3532 } else {
3533 os::sleep(Thread::current(), 10, false);
3534 }
3535 }
3536 }
3537
3538 // Called from the tight loops to possibly influence time-sharing heuristics
3539 void os::loop_breaker(int attempts) {
3540 os::yield_all(attempts);
3541 }
3542
3543
3544 // Interface for setting lwp priorities. If we are using T2 libthread,
3545 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3546 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3547 // function is meaningless in this mode so we must adjust the real lwp's priority
3548 // The routines below implement the getting and setting of lwp priorities.
3549 //
3550 // Note: There are three priority scales used on Solaris. Java priotities
3551 // which range from 1 to 10, libthread "thr_setprio" scale which range
3552 // from 0 to 127, and the current scheduling class of the process we
3553 // are running in. This is typically from -60 to +60.
3554 // The setting of the lwp priorities in done after a call to thr_setprio
3555 // so Java priorities are mapped to libthread priorities and we map from
3556 // the latter to lwp priorities. We don't keep priorities stored in
3557 // Java priorities since some of our worker threads want to set priorities
3558 // higher than all Java threads.
3559 //
3560 // For related information:
3561 // (1) man -s 2 priocntl
3562 // (2) man -s 4 priocntl
3563 // (3) man dispadmin
3564 // = librt.so
3565 // = libthread/common/rtsched.c - thrp_setlwpprio().
3566 // = ps -cL <pid> ... to validate priority.
3567 // = sched_get_priority_min and _max
3568 // pthread_create
3569 // sched_setparam
3570 // pthread_setschedparam
3571 //
3572 // Assumptions:
3573 // + We assume that all threads in the process belong to the same
3574 // scheduling class. IE. an homogenous process.
3575 // + Must be root or in IA group to change change "interactive" attribute.
3576 // Priocntl() will fail silently. The only indication of failure is when
3577 // we read-back the value and notice that it hasn't changed.
3578 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3579 // + For RT, change timeslice as well. Invariant:
3580 // constant "priority integral"
3581 // Konst == TimeSlice * (60-Priority)
3582 // Given a priority, compute appropriate timeslice.
3583 // + Higher numerical values have higher priority.
3584
3585 // sched class attributes
3586 typedef struct {
3587 int schedPolicy; // classID
3588 int maxPrio;
3589 int minPrio;
3590 } SchedInfo;
3591
3592
3593 static SchedInfo tsLimits, iaLimits, rtLimits;
3594
3595 #ifdef ASSERT
3596 static int ReadBackValidate = 1;
3597 #endif
3598 static int myClass = 0;
3599 static int myMin = 0;
3600 static int myMax = 0;
3601 static int myCur = 0;
3602 static bool priocntl_enable = false;
3603
3604
3605 // Call the version of priocntl suitable for all supported versions
3606 // of Solaris. We need to call through this wrapper so that we can
3607 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3608 //
3609 // This code should be removed if we ever stop supporting Solaris 8
3610 // and earlier releases.
3611
3612 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3613 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3614 static priocntl_type priocntl_ptr = priocntl_stub;
3615
3616 // Stub to set the value of the real pointer, and then call the real
3617 // function.
3618
3619 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3620 // Try Solaris 8- name only.
3621 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3622 guarantee(tmp != NULL, "priocntl function not found.");
3623 priocntl_ptr = tmp;
3624 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3625 }
3626
3627
3628 // lwp_priocntl_init
3629 //
3630 // Try to determine the priority scale for our process.
3631 //
3632 // Return errno or 0 if OK.
3633 //
3634 static
3635 int lwp_priocntl_init ()
3636 {
3637 int rslt;
3638 pcinfo_t ClassInfo;
3639 pcparms_t ParmInfo;
3640 int i;
3641
3642 if (!UseThreadPriorities) return 0;
3643
3644 // We are using Bound threads, we need to determine our priority ranges
3645 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3646 // If ThreadPriorityPolicy is 1, switch tables
3647 if (ThreadPriorityPolicy == 1) {
3648 for (i = 0 ; i < MaxPriority+1; i++)
3649 os::java_to_os_priority[i] = prio_policy1[i];
3650 }
3651 }
3652 // Not using Bound Threads, set to ThreadPolicy 1
3653 else {
3654 for ( i = 0 ; i < MaxPriority+1; i++ ) {
3655 os::java_to_os_priority[i] = prio_policy1[i];
3656 }
3657 return 0;
3658 }
3659
3660
3661 // Get IDs for a set of well-known scheduling classes.
3662 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3663 // the system. We should have a loop that iterates over the
3664 // classID values, which are known to be "small" integers.
3665
3666 strcpy(ClassInfo.pc_clname, "TS");
3667 ClassInfo.pc_cid = -1;
3668 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3669 if (rslt < 0) return errno;
3670 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3671 tsLimits.schedPolicy = ClassInfo.pc_cid;
3672 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3673 tsLimits.minPrio = -tsLimits.maxPrio;
3674
3675 strcpy(ClassInfo.pc_clname, "IA");
3676 ClassInfo.pc_cid = -1;
3677 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3678 if (rslt < 0) return errno;
3679 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3680 iaLimits.schedPolicy = ClassInfo.pc_cid;
3681 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3682 iaLimits.minPrio = -iaLimits.maxPrio;
3683
3684 strcpy(ClassInfo.pc_clname, "RT");
3685 ClassInfo.pc_cid = -1;
3686 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3687 if (rslt < 0) return errno;
3688 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3689 rtLimits.schedPolicy = ClassInfo.pc_cid;
3690 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3691 rtLimits.minPrio = 0;
3692
3693
3694 // Query our "current" scheduling class.
3695 // This will normally be IA,TS or, rarely, RT.
3696 memset (&ParmInfo, 0, sizeof(ParmInfo));
3697 ParmInfo.pc_cid = PC_CLNULL;
3698 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo );
3699 if ( rslt < 0 ) return errno;
3700 myClass = ParmInfo.pc_cid;
3701
3702 // We now know our scheduling classId, get specific information
3703 // the class.
3704 ClassInfo.pc_cid = myClass;
3705 ClassInfo.pc_clname[0] = 0;
3706 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo );
3707 if ( rslt < 0 ) return errno;
3708
3709 if (ThreadPriorityVerbose)
3710 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3711
3712 memset(&ParmInfo, 0, sizeof(pcparms_t));
3713 ParmInfo.pc_cid = PC_CLNULL;
3714 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3715 if (rslt < 0) return errno;
3716
3717 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3718 myMin = rtLimits.minPrio;
3719 myMax = rtLimits.maxPrio;
3720 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3721 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3722 myMin = iaLimits.minPrio;
3723 myMax = iaLimits.maxPrio;
3724 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3725 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3726 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3727 myMin = tsLimits.minPrio;
3728 myMax = tsLimits.maxPrio;
3729 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3730 } else {
3731 // No clue - punt
3732 if (ThreadPriorityVerbose)
3733 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3734 return EINVAL; // no clue, punt
3735 }
3736
3737 if (ThreadPriorityVerbose)
3738 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3739
3740 priocntl_enable = true; // Enable changing priorities
3741 return 0;
3742 }
3743
3744 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3745 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3746 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3747
3748
3749 // scale_to_lwp_priority
3750 //
3751 // Convert from the libthread "thr_setprio" scale to our current
3752 // lwp scheduling class scale.
3753 //
3754 static
3755 int scale_to_lwp_priority (int rMin, int rMax, int x)
3756 {
3757 int v;
3758
3759 if (x == 127) return rMax; // avoid round-down
3760 v = (((x*(rMax-rMin)))/128)+rMin;
3761 return v;
3762 }
3763
3764
3765 // set_lwp_priority
3766 //
3767 // Set the priority of the lwp. This call should only be made
3768 // when using bound threads (T2 threads are bound by default).
3769 //
3770 int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
3771 {
3772 int rslt;
3773 int Actual, Expected, prv;
3774 pcparms_t ParmInfo; // for GET-SET
3775 #ifdef ASSERT
3776 pcparms_t ReadBack; // for readback
3777 #endif
3778
3779 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3780 // Query current values.
3781 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3782 // Cache "pcparms_t" in global ParmCache.
3783 // TODO: elide set-to-same-value
3784
3785 // If something went wrong on init, don't change priorities.
3786 if ( !priocntl_enable ) {
3787 if (ThreadPriorityVerbose)
3788 tty->print_cr("Trying to set priority but init failed, ignoring");
3789 return EINVAL;
3790 }
3791
3792
3793 // If lwp hasn't started yet, just return
3794 // the _start routine will call us again.
3795 if ( lwpid <= 0 ) {
3796 if (ThreadPriorityVerbose) {
3797 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set",
3798 ThreadID, newPrio);
3799 }
3800 return 0;
3801 }
3802
3803 if (ThreadPriorityVerbose) {
3804 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3805 ThreadID, lwpid, newPrio);
3806 }
3807
3808 memset(&ParmInfo, 0, sizeof(pcparms_t));
3809 ParmInfo.pc_cid = PC_CLNULL;
3810 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3811 if (rslt < 0) return errno;
3812
3813 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3814 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3815 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio);
3816 rtInfo->rt_tqsecs = RT_NOCHANGE;
3817 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3818 if (ThreadPriorityVerbose) {
3819 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3820 }
3821 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3822 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3823 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim);
3824 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio);
3825 iaInfo->ia_uprilim = IA_NOCHANGE;
3826 iaInfo->ia_mode = IA_NOCHANGE;
3827 if (ThreadPriorityVerbose) {
3828 tty->print_cr ("IA: [%d...%d] %d->%d\n",
3829 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3830 }
3831 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3832 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3833 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim);
3834 prv = tsInfo->ts_upri;
3835 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio);
3836 tsInfo->ts_uprilim = IA_NOCHANGE;
3837 if (ThreadPriorityVerbose) {
3838 tty->print_cr ("TS: %d [%d...%d] %d->%d\n",
3839 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3840 }
3841 if (prv == tsInfo->ts_upri) return 0;
3842 } else {
3843 if ( ThreadPriorityVerbose ) {
3844 tty->print_cr ("Unknown scheduling class\n");
3845 }
3846 return EINVAL; // no clue, punt
3847 }
3848
3849 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3850 if (ThreadPriorityVerbose && rslt) {
3851 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3852 }
3853 if (rslt < 0) return errno;
3854
3855 #ifdef ASSERT
3856 // Sanity check: read back what we just attempted to set.
3857 // In theory it could have changed in the interim ...
3858 //
3859 // The priocntl system call is tricky.
3860 // Sometimes it'll validate the priority value argument and
3861 // return EINVAL if unhappy. At other times it fails silently.
3862 // Readbacks are prudent.
3863
3864 if (!ReadBackValidate) return 0;
3865
3866 memset(&ReadBack, 0, sizeof(pcparms_t));
3867 ReadBack.pc_cid = PC_CLNULL;
3868 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3869 assert(rslt >= 0, "priocntl failed");
3870 Actual = Expected = 0xBAD;
3871 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3872 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3873 Actual = RTPRI(ReadBack)->rt_pri;
3874 Expected = RTPRI(ParmInfo)->rt_pri;
3875 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3876 Actual = IAPRI(ReadBack)->ia_upri;
3877 Expected = IAPRI(ParmInfo)->ia_upri;
3878 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3879 Actual = TSPRI(ReadBack)->ts_upri;
3880 Expected = TSPRI(ParmInfo)->ts_upri;
3881 } else {
3882 if ( ThreadPriorityVerbose ) {
3883 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid);
3884 }
3885 }
3886
3887 if (Actual != Expected) {
3888 if ( ThreadPriorityVerbose ) {
3889 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3890 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3891 }
3892 }
3893 #endif
3894
3895 return 0;
3896 }
3897
3898
3899
3900 // Solaris only gives access to 128 real priorities at a time,
3901 // so we expand Java's ten to fill this range. This would be better
3902 // if we dynamically adjusted relative priorities.
3903 //
3904 // The ThreadPriorityPolicy option allows us to select 2 different
3905 // priority scales.
3906 //
3907 // ThreadPriorityPolicy=0
3908 // Since the Solaris' default priority is MaximumPriority, we do not
3909 // set a priority lower than Max unless a priority lower than
3910 // NormPriority is requested.
3911 //
3912 // ThreadPriorityPolicy=1
3913 // This mode causes the priority table to get filled with
3914 // linear values. NormPriority get's mapped to 50% of the
3915 // Maximum priority an so on. This will cause VM threads
3916 // to get unfair treatment against other Solaris processes
3917 // which do not explicitly alter their thread priorities.
3918 //
3919
3920
3921 int os::java_to_os_priority[MaxPriority + 1] = {
3922 -99999, // 0 Entry should never be used
3923
3924 0, // 1 MinPriority
3925 32, // 2
3926 64, // 3
3927
3928 96, // 4
3929 127, // 5 NormPriority
3930 127, // 6
3931
3932 127, // 7
3933 127, // 8
3934 127, // 9 NearMaxPriority
3935
3936 127 // 10 MaxPriority
3937 };
3938
3939
3940 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3941 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3942 if ( !UseThreadPriorities ) return OS_OK;
3943 int status = thr_setprio(thread->osthread()->thread_id(), newpri);
3944 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) )
3945 status |= (set_lwp_priority (thread->osthread()->thread_id(),
3946 thread->osthread()->lwp_id(), newpri ));
3947 return (status == 0) ? OS_OK : OS_ERR;
3948 }
3949
3950
3951 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3952 int p;
3953 if ( !UseThreadPriorities ) {
3954 *priority_ptr = NormalPriority;
3955 return OS_OK;
3956 }
3957 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3958 if (status != 0) {
3959 return OS_ERR;
3960 }
3961 *priority_ptr = p;
3962 return OS_OK;
3963 }
3964
3965
3966 // Hint to the underlying OS that a task switch would not be good.
3967 // Void return because it's a hint and can fail.
3968 void os::hint_no_preempt() {
3969 schedctl_start(schedctl_init());
3970 }
3971
3972 void os::interrupt(Thread* thread) {
3973 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3974
3975 OSThread* osthread = thread->osthread();
3976
3977 int isInterrupted = osthread->interrupted();
3978 if (!isInterrupted) {
3979 osthread->set_interrupted(true);
3980 OrderAccess::fence();
3981 // os::sleep() is implemented with either poll (NULL,0,timeout) or
3982 // by parking on _SleepEvent. If the former, thr_kill will unwedge
3983 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
3984 ParkEvent * const slp = thread->_SleepEvent ;
3985 if (slp != NULL) slp->unpark() ;
3986 }
3987
3988 // For JSR166: unpark after setting status but before thr_kill -dl
3989 if (thread->is_Java_thread()) {
3990 ((JavaThread*)thread)->parker()->unpark();
3991 }
3992
3993 // Handle interruptible wait() ...
3994 ParkEvent * const ev = thread->_ParkEvent ;
3995 if (ev != NULL) ev->unpark() ;
3996
3997 // When events are used everywhere for os::sleep, then this thr_kill
3998 // will only be needed if UseVMInterruptibleIO is true.
3999
4000 if (!isInterrupted) {
4001 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4002 assert_status(status == 0, status, "thr_kill");
4003
4004 // Bump thread interruption counter
4005 RuntimeService::record_thread_interrupt_signaled_count();
4006 }
4007 }
4008
4009
4010 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4011 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4012
4013 OSThread* osthread = thread->osthread();
4014
4015 bool res = osthread->interrupted();
4016
4017 // NOTE that since there is no "lock" around these two operations,
4018 // there is the possibility that the interrupted flag will be
4019 // "false" but that the interrupt event will be set. This is
4020 // intentional. The effect of this is that Object.wait() will appear
4021 // to have a spurious wakeup, which is not harmful, and the
4022 // possibility is so rare that it is not worth the added complexity
4023 // to add yet another lock. It has also been recommended not to put
4024 // the interrupted flag into the os::Solaris::Event structure,
4025 // because it hides the issue.
4026 if (res && clear_interrupted) {
4027 osthread->set_interrupted(false);
4028 }
4029 return res;
4030 }
4031
4032
4033 void os::print_statistics() {
4034 }
4035
4036 int os::message_box(const char* title, const char* message) {
4037 int i;
4038 fdStream err(defaultStream::error_fd());
4039 for (i = 0; i < 78; i++) err.print_raw("=");
4040 err.cr();
4041 err.print_raw_cr(title);
4042 for (i = 0; i < 78; i++) err.print_raw("-");
4043 err.cr();
4044 err.print_raw_cr(message);
4045 for (i = 0; i < 78; i++) err.print_raw("=");
4046 err.cr();
4047
4048 char buf[16];
4049 // Prevent process from exiting upon "read error" without consuming all CPU
4050 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4051
4052 return buf[0] == 'y' || buf[0] == 'Y';
4053 }
4054
4055 // A lightweight implementation that does not suspend the target thread and
4056 // thus returns only a hint. Used for profiling only!
4057 ExtendedPC os::get_thread_pc(Thread* thread) {
4058 // Make sure that it is called by the watcher and the Threads lock is owned.
4059 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4060 // For now, is only used to profile the VM Thread
4061 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4062 ExtendedPC epc;
4063
4064 GetThreadPC_Callback cb(ProfileVM_lock);
4065 OSThread *osthread = thread->osthread();
4066 const int time_to_wait = 400; // 400ms wait for initial response
4067 int status = cb.interrupt(thread, time_to_wait);
4068
4069 if (cb.is_done() ) {
4070 epc = cb.addr();
4071 } else {
4072 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4073 osthread->thread_id(), status););
4074 // epc is already NULL
4075 }
4076 return epc;
4077 }
4078
4079
4080 // This does not do anything on Solaris. This is basically a hook for being
4081 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4082 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4083 f(value, method, args, thread);
4084 }
4085
4086 // This routine may be used by user applications as a "hook" to catch signals.
4087 // The user-defined signal handler must pass unrecognized signals to this
4088 // routine, and if it returns true (non-zero), then the signal handler must
4089 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4090 // routine will never retun false (zero), but instead will execute a VM panic
4091 // routine kill the process.
4092 //
4093 // If this routine returns false, it is OK to call it again. This allows
4094 // the user-defined signal handler to perform checks either before or after
4095 // the VM performs its own checks. Naturally, the user code would be making
4096 // a serious error if it tried to handle an exception (such as a null check
4097 // or breakpoint) that the VM was generating for its own correct operation.
4098 //
4099 // This routine may recognize any of the following kinds of signals:
4100 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4101 // os::Solaris::SIGasync
4102 // It should be consulted by handlers for any of those signals.
4103 // It explicitly does not recognize os::Solaris::SIGinterrupt
4104 //
4105 // The caller of this routine must pass in the three arguments supplied
4106 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4107 // field of the structure passed to sigaction(). This routine assumes that
4108 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4109 //
4110 // Note that the VM will print warnings if it detects conflicting signal
4111 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4112 //
4113 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
4114
4115
4116 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4117 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4118 }
4119
4120 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4121 is needed to provoke threads blocked on IO to return an EINTR
4122 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4123 does NOT participate in signal chaining due to requirement for
4124 NOT setting SA_RESTART to make EINTR work. */
4125 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4126 if (UseSignalChaining) {
4127 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4128 if (actp && actp->sa_handler) {
4129 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4130 }
4131 }
4132 }
4133
4134 // This boolean allows users to forward their own non-matching signals
4135 // to JVM_handle_solaris_signal, harmlessly.
4136 bool os::Solaris::signal_handlers_are_installed = false;
4137
4138 // For signal-chaining
4139 bool os::Solaris::libjsig_is_loaded = false;
4140 typedef struct sigaction *(*get_signal_t)(int);
4141 get_signal_t os::Solaris::get_signal_action = NULL;
4142
4143 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4144 struct sigaction *actp = NULL;
4145
4146 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4147 // Retrieve the old signal handler from libjsig
4148 actp = (*get_signal_action)(sig);
4149 }
4150 if (actp == NULL) {
4151 // Retrieve the preinstalled signal handler from jvm
4152 actp = get_preinstalled_handler(sig);
4153 }
4154
4155 return actp;
4156 }
4157
4158 static bool call_chained_handler(struct sigaction *actp, int sig,
4159 siginfo_t *siginfo, void *context) {
4160 // Call the old signal handler
4161 if (actp->sa_handler == SIG_DFL) {
4162 // It's more reasonable to let jvm treat it as an unexpected exception
4163 // instead of taking the default action.
4164 return false;
4165 } else if (actp->sa_handler != SIG_IGN) {
4166 if ((actp->sa_flags & SA_NODEFER) == 0) {
4167 // automaticlly block the signal
4168 sigaddset(&(actp->sa_mask), sig);
4169 }
4170
4171 sa_handler_t hand;
4172 sa_sigaction_t sa;
4173 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4174 // retrieve the chained handler
4175 if (siginfo_flag_set) {
4176 sa = actp->sa_sigaction;
4177 } else {
4178 hand = actp->sa_handler;
4179 }
4180
4181 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4182 actp->sa_handler = SIG_DFL;
4183 }
4184
4185 // try to honor the signal mask
4186 sigset_t oset;
4187 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4188
4189 // call into the chained handler
4190 if (siginfo_flag_set) {
4191 (*sa)(sig, siginfo, context);
4192 } else {
4193 (*hand)(sig);
4194 }
4195
4196 // restore the signal mask
4197 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4198 }
4199 // Tell jvm's signal handler the signal is taken care of.
4200 return true;
4201 }
4202
4203 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4204 bool chained = false;
4205 // signal-chaining
4206 if (UseSignalChaining) {
4207 struct sigaction *actp = get_chained_signal_action(sig);
4208 if (actp != NULL) {
4209 chained = call_chained_handler(actp, sig, siginfo, context);
4210 }
4211 }
4212 return chained;
4213 }
4214
4215 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4216 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4217 if (preinstalled_sigs[sig] != 0) {
4218 return &chainedsigactions[sig];
4219 }
4220 return NULL;
4221 }
4222
4223 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4224
4225 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4226 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4227 chainedsigactions[sig] = oldAct;
4228 preinstalled_sigs[sig] = 1;
4229 }
4230
4231 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4232 // Check for overwrite.
4233 struct sigaction oldAct;
4234 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4235 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4236 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4237 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4238 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4239 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4240 if (AllowUserSignalHandlers || !set_installed) {
4241 // Do not overwrite; user takes responsibility to forward to us.
4242 return;
4243 } else if (UseSignalChaining) {
4244 if (oktochain) {
4245 // save the old handler in jvm
4246 save_preinstalled_handler(sig, oldAct);
4247 } else {
4248 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4249 }
4250 // libjsig also interposes the sigaction() call below and saves the
4251 // old sigaction on it own.
4252 } else {
4253 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4254 "%#lx for signal %d.", (long)oldhand, sig));
4255 }
4256 }
4257
4258 struct sigaction sigAct;
4259 sigfillset(&(sigAct.sa_mask));
4260 sigAct.sa_handler = SIG_DFL;
4261
4262 sigAct.sa_sigaction = signalHandler;
4263 // Handle SIGSEGV on alternate signal stack if
4264 // not using stack banging
4265 if (!UseStackBanging && sig == SIGSEGV) {
4266 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4267 // Interruptible i/o requires SA_RESTART cleared so EINTR
4268 // is returned instead of restarting system calls
4269 } else if (sig == os::Solaris::SIGinterrupt()) {
4270 sigemptyset(&sigAct.sa_mask);
4271 sigAct.sa_handler = NULL;
4272 sigAct.sa_flags = SA_SIGINFO;
4273 sigAct.sa_sigaction = sigINTRHandler;
4274 } else {
4275 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4276 }
4277 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4278
4279 sigaction(sig, &sigAct, &oldAct);
4280
4281 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4282 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4283 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4284 }
4285
4286
4287 #define DO_SIGNAL_CHECK(sig) \
4288 if (!sigismember(&check_signal_done, sig)) \
4289 os::Solaris::check_signal_handler(sig)
4290
4291 // This method is a periodic task to check for misbehaving JNI applications
4292 // under CheckJNI, we can add any periodic checks here
4293
4294 void os::run_periodic_checks() {
4295 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4296 // thereby preventing a NULL checks.
4297 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4298
4299 if (check_signals == false) return;
4300
4301 // SEGV and BUS if overridden could potentially prevent
4302 // generation of hs*.log in the event of a crash, debugging
4303 // such a case can be very challenging, so we absolutely
4304 // check for the following for a good measure:
4305 DO_SIGNAL_CHECK(SIGSEGV);
4306 DO_SIGNAL_CHECK(SIGILL);
4307 DO_SIGNAL_CHECK(SIGFPE);
4308 DO_SIGNAL_CHECK(SIGBUS);
4309 DO_SIGNAL_CHECK(SIGPIPE);
4310 DO_SIGNAL_CHECK(SIGXFSZ);
4311
4312 // ReduceSignalUsage allows the user to override these handlers
4313 // see comments at the very top and jvm_solaris.h
4314 if (!ReduceSignalUsage) {
4315 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4316 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4317 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4318 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4319 }
4320
4321 // See comments above for using JVM1/JVM2 and UseAltSigs
4322 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4323 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4324
4325 }
4326
4327 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4328
4329 static os_sigaction_t os_sigaction = NULL;
4330
4331 void os::Solaris::check_signal_handler(int sig) {
4332 char buf[O_BUFLEN];
4333 address jvmHandler = NULL;
4334
4335 struct sigaction act;
4336 if (os_sigaction == NULL) {
4337 // only trust the default sigaction, in case it has been interposed
4338 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4339 if (os_sigaction == NULL) return;
4340 }
4341
4342 os_sigaction(sig, (struct sigaction*)NULL, &act);
4343
4344 address thisHandler = (act.sa_flags & SA_SIGINFO)
4345 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4346 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4347
4348
4349 switch(sig) {
4350 case SIGSEGV:
4351 case SIGBUS:
4352 case SIGFPE:
4353 case SIGPIPE:
4354 case SIGXFSZ:
4355 case SIGILL:
4356 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4357 break;
4358
4359 case SHUTDOWN1_SIGNAL:
4360 case SHUTDOWN2_SIGNAL:
4361 case SHUTDOWN3_SIGNAL:
4362 case BREAK_SIGNAL:
4363 jvmHandler = (address)user_handler();
4364 break;
4365
4366 default:
4367 int intrsig = os::Solaris::SIGinterrupt();
4368 int asynsig = os::Solaris::SIGasync();
4369
4370 if (sig == intrsig) {
4371 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4372 } else if (sig == asynsig) {
4373 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4374 } else {
4375 return;
4376 }
4377 break;
4378 }
4379
4380
4381 if (thisHandler != jvmHandler) {
4382 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4383 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4384 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4385 // No need to check this sig any longer
4386 sigaddset(&check_signal_done, sig);
4387 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4388 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4389 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4390 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4391 // No need to check this sig any longer
4392 sigaddset(&check_signal_done, sig);
4393 }
4394
4395 // Print all the signal handler state
4396 if (sigismember(&check_signal_done, sig)) {
4397 print_signal_handlers(tty, buf, O_BUFLEN);
4398 }
4399
4400 }
4401
4402 void os::Solaris::install_signal_handlers() {
4403 bool libjsigdone = false;
4404 signal_handlers_are_installed = true;
4405
4406 // signal-chaining
4407 typedef void (*signal_setting_t)();
4408 signal_setting_t begin_signal_setting = NULL;
4409 signal_setting_t end_signal_setting = NULL;
4410 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4411 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4412 if (begin_signal_setting != NULL) {
4413 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4414 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4415 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4416 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4417 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4418 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4419 libjsig_is_loaded = true;
4420 if (os::Solaris::get_libjsig_version != NULL) {
4421 libjsigversion = (*os::Solaris::get_libjsig_version)();
4422 }
4423 assert(UseSignalChaining, "should enable signal-chaining");
4424 }
4425 if (libjsig_is_loaded) {
4426 // Tell libjsig jvm is setting signal handlers
4427 (*begin_signal_setting)();
4428 }
4429
4430 set_signal_handler(SIGSEGV, true, true);
4431 set_signal_handler(SIGPIPE, true, true);
4432 set_signal_handler(SIGXFSZ, true, true);
4433 set_signal_handler(SIGBUS, true, true);
4434 set_signal_handler(SIGILL, true, true);
4435 set_signal_handler(SIGFPE, true, true);
4436
4437
4438 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4439
4440 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4441 // can not register overridable signals which might be > 32
4442 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4443 // Tell libjsig jvm has finished setting signal handlers
4444 (*end_signal_setting)();
4445 libjsigdone = true;
4446 }
4447 }
4448
4449 // Never ok to chain our SIGinterrupt
4450 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4451 set_signal_handler(os::Solaris::SIGasync(), true, true);
4452
4453 if (libjsig_is_loaded && !libjsigdone) {
4454 // Tell libjsig jvm finishes setting signal handlers
4455 (*end_signal_setting)();
4456 }
4457
4458 // We don't activate signal checker if libjsig is in place, we trust ourselves
4459 // and if UserSignalHandler is installed all bets are off
4460 if (CheckJNICalls) {
4461 if (libjsig_is_loaded) {
4462 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4463 check_signals = false;
4464 }
4465 if (AllowUserSignalHandlers) {
4466 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4467 check_signals = false;
4468 }
4469 }
4470 }
4471
4472
4473 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4474
4475 const char * signames[] = {
4476 "SIG0",
4477 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4478 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4479 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4480 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4481 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4482 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4483 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4484 "SIGCANCEL", "SIGLOST"
4485 };
4486
4487 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4488 if (0 < exception_code && exception_code <= SIGRTMAX) {
4489 // signal
4490 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4491 jio_snprintf(buf, size, "%s", signames[exception_code]);
4492 } else {
4493 jio_snprintf(buf, size, "SIG%d", exception_code);
4494 }
4495 return buf;
4496 } else {
4497 return NULL;
4498 }
4499 }
4500
4501 // (Static) wrappers for the new libthread API
4502 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4503 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4504 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4505 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4506 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4507
4508 // (Static) wrapper for getisax(2) call.
4509 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4510
4511 // (Static) wrappers for the liblgrp API
4512 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4513 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4514 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4515 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4516 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4517 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4518 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4519 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4520 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4521
4522 // (Static) wrapper for meminfo() call.
4523 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4524
4525 static address resolve_symbol_lazy(const char* name) {
4526 address addr = (address) dlsym(RTLD_DEFAULT, name);
4527 if(addr == NULL) {
4528 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4529 addr = (address) dlsym(RTLD_NEXT, name);
4530 }
4531 return addr;
4532 }
4533
4534 static address resolve_symbol(const char* name) {
4535 address addr = resolve_symbol_lazy(name);
4536 if(addr == NULL) {
4537 fatal(dlerror());
4538 }
4539 return addr;
4540 }
4541
4542
4543
4544 // isT2_libthread()
4545 //
4546 // Routine to determine if we are currently using the new T2 libthread.
4547 //
4548 // We determine if we are using T2 by reading /proc/self/lstatus and
4549 // looking for a thread with the ASLWP bit set. If we find this status
4550 // bit set, we must assume that we are NOT using T2. The T2 team
4551 // has approved this algorithm.
4552 //
4553 // We need to determine if we are running with the new T2 libthread
4554 // since setting native thread priorities is handled differently
4555 // when using this library. All threads created using T2 are bound
4556 // threads. Calling thr_setprio is meaningless in this case.
4557 //
4558 bool isT2_libthread() {
4559 static prheader_t * lwpArray = NULL;
4560 static int lwpSize = 0;
4561 static int lwpFile = -1;
4562 lwpstatus_t * that;
4563 char lwpName [128];
4564 bool isT2 = false;
4565
4566 #define ADR(x) ((uintptr_t)(x))
4567 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4568
4569 lwpFile = open("/proc/self/lstatus", O_RDONLY, 0);
4570 if (lwpFile < 0) {
4571 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4572 return false;
4573 }
4574 lwpSize = 16*1024;
4575 for (;;) {
4576 lseek (lwpFile, 0, SEEK_SET);
4577 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize);
4578 if (read(lwpFile, lwpArray, lwpSize) < 0) {
4579 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4580 break;
4581 }
4582 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4583 // We got a good snapshot - now iterate over the list.
4584 int aslwpcount = 0;
4585 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4586 that = LWPINDEX(lwpArray,i);
4587 if (that->pr_flags & PR_ASLWP) {
4588 aslwpcount++;
4589 }
4590 }
4591 if (aslwpcount == 0) isT2 = true;
4592 break;
4593 }
4594 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4595 FREE_C_HEAP_ARRAY(char, lwpArray); // retry.
4596 }
4597
4598 FREE_C_HEAP_ARRAY(char, lwpArray);
4599 close (lwpFile);
4600 if (ThreadPriorityVerbose) {
4601 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4602 else tty->print_cr("We are not running with a T2 libthread\n");
4603 }
4604 return isT2;
4605 }
4606
4607
4608 void os::Solaris::libthread_init() {
4609 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4610
4611 // Determine if we are running with the new T2 libthread
4612 os::Solaris::set_T2_libthread(isT2_libthread());
4613
4614 lwp_priocntl_init();
4615
4616 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4617 if(func == NULL) {
4618 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4619 // Guarantee that this VM is running on an new enough OS (5.6 or
4620 // later) that it will have a new enough libthread.so.
4621 guarantee(func != NULL, "libthread.so is too old.");
4622 }
4623
4624 // Initialize the new libthread getstate API wrappers
4625 func = resolve_symbol("thr_getstate");
4626 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4627
4628 func = resolve_symbol("thr_setstate");
4629 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4630
4631 func = resolve_symbol("thr_setmutator");
4632 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4633
4634 func = resolve_symbol("thr_suspend_mutator");
4635 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4636
4637 func = resolve_symbol("thr_continue_mutator");
4638 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4639
4640 int size;
4641 void (*handler_info_func)(address *, int *);
4642 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4643 handler_info_func(&handler_start, &size);
4644 handler_end = handler_start + size;
4645 }
4646
4647
4648 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4649 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4650 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4651 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4652 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4653 int os::Solaris::_mutex_scope = USYNC_THREAD;
4654
4655 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4656 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4657 int_fnP_cond_tP os::Solaris::_cond_signal;
4658 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4659 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4660 int_fnP_cond_tP os::Solaris::_cond_destroy;
4661 int os::Solaris::_cond_scope = USYNC_THREAD;
4662
4663 void os::Solaris::synchronization_init() {
4664 if(UseLWPSynchronization) {
4665 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4666 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4667 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4668 os::Solaris::set_mutex_init(lwp_mutex_init);
4669 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4670 os::Solaris::set_mutex_scope(USYNC_THREAD);
4671
4672 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4673 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4674 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4675 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4676 os::Solaris::set_cond_init(lwp_cond_init);
4677 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4678 os::Solaris::set_cond_scope(USYNC_THREAD);
4679 }
4680 else {
4681 os::Solaris::set_mutex_scope(USYNC_THREAD);
4682 os::Solaris::set_cond_scope(USYNC_THREAD);
4683
4684 if(UsePthreads) {
4685 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4686 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4687 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4688 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4689 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4690
4691 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4692 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4693 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4694 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4695 os::Solaris::set_cond_init(pthread_cond_default_init);
4696 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4697 }
4698 else {
4699 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4700 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4701 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4702 os::Solaris::set_mutex_init(::mutex_init);
4703 os::Solaris::set_mutex_destroy(::mutex_destroy);
4704
4705 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4706 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4707 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4708 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4709 os::Solaris::set_cond_init(::cond_init);
4710 os::Solaris::set_cond_destroy(::cond_destroy);
4711 }
4712 }
4713 }
4714
4715 bool os::Solaris::liblgrp_init() {
4716 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4717 if (handle != NULL) {
4718 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4719 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4720 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4721 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4722 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4723 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4724 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4725 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4726 dlsym(handle, "lgrp_cookie_stale")));
4727
4728 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4729 set_lgrp_cookie(c);
4730 return true;
4731 }
4732 return false;
4733 }
4734
4735 void os::Solaris::misc_sym_init() {
4736 address func;
4737
4738 // getisax
4739 func = resolve_symbol_lazy("getisax");
4740 if (func != NULL) {
4741 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4742 }
4743
4744 // meminfo
4745 func = resolve_symbol_lazy("meminfo");
4746 if (func != NULL) {
4747 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4748 }
4749 }
4750
4751 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4752 assert(_getisax != NULL, "_getisax not set");
4753 return _getisax(array, n);
4754 }
4755
4756 // Symbol doesn't exist in Solaris 8 pset.h
4757 #ifndef PS_MYID
4758 #define PS_MYID -3
4759 #endif
4760
4761 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4762 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4763 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4764
4765 void init_pset_getloadavg_ptr(void) {
4766 pset_getloadavg_ptr =
4767 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4768 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4769 warning("pset_getloadavg function not found");
4770 }
4771 }
4772
4773 int os::Solaris::_dev_zero_fd = -1;
4774
4775 // this is called _before_ the global arguments have been parsed
4776 void os::init(void) {
4777 _initial_pid = getpid();
4778
4779 max_hrtime = first_hrtime = gethrtime();
4780
4781 init_random(1234567);
4782
4783 page_size = sysconf(_SC_PAGESIZE);
4784 if (page_size == -1)
4785 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4786 strerror(errno)));
4787 init_page_sizes((size_t) page_size);
4788
4789 Solaris::initialize_system_info();
4790
4791 // Initialize misc. symbols as soon as possible, so we can use them
4792 // if we need them.
4793 Solaris::misc_sym_init();
4794
4795 int fd = open("/dev/zero", O_RDWR);
4796 if (fd < 0) {
4797 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4798 } else {
4799 Solaris::set_dev_zero_fd(fd);
4800
4801 // Close on exec, child won't inherit.
4802 fcntl(fd, F_SETFD, FD_CLOEXEC);
4803 }
4804
4805 clock_tics_per_sec = CLK_TCK;
4806
4807 // check if dladdr1() exists; dladdr1 can provide more information than
4808 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4809 // and is available on linker patches for 5.7 and 5.8.
4810 // libdl.so must have been loaded, this call is just an entry lookup
4811 void * hdl = dlopen("libdl.so", RTLD_NOW);
4812 if (hdl)
4813 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4814
4815 // (Solaris only) this switches to calls that actually do locking.
4816 ThreadCritical::initialize();
4817
4818 main_thread = thr_self();
4819
4820 // Constant minimum stack size allowed. It must be at least
4821 // the minimum of what the OS supports (thr_min_stack()), and
4822 // enough to allow the thread to get to user bytecode execution.
4823 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4824 // If the pagesize of the VM is greater than 8K determine the appropriate
4825 // number of initial guard pages. The user can change this with the
4826 // command line arguments, if needed.
4827 if (vm_page_size() > 8*K) {
4828 StackYellowPages = 1;
4829 StackRedPages = 1;
4830 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4831 }
4832 }
4833
4834 // To install functions for atexit system call
4835 extern "C" {
4836 static void perfMemory_exit_helper() {
4837 perfMemory_exit();
4838 }
4839 }
4840
4841 // this is called _after_ the global arguments have been parsed
4842 jint os::init_2(void) {
4843 // try to enable extended file IO ASAP, see 6431278
4844 os::Solaris::try_enable_extended_io();
4845
4846 // Allocate a single page and mark it as readable for safepoint polling. Also
4847 // use this first mmap call to check support for MAP_ALIGN.
4848 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4849 page_size,
4850 MAP_PRIVATE | MAP_ALIGN,
4851 PROT_READ);
4852 if (polling_page == NULL) {
4853 has_map_align = false;
4854 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4855 PROT_READ);
4856 }
4857
4858 os::set_polling_page(polling_page);
4859
4860 #ifndef PRODUCT
4861 if( Verbose && PrintMiscellaneous )
4862 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4863 #endif
4864
4865 if (!UseMembar) {
4866 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4867 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4868 os::set_memory_serialize_page( mem_serialize_page );
4869
4870 #ifndef PRODUCT
4871 if(Verbose && PrintMiscellaneous)
4872 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4873 #endif
4874 }
4875
4876 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
4877
4878 // Check minimum allowable stack size for thread creation and to initialize
4879 // the java system classes, including StackOverflowError - depends on page
4880 // size. Add a page for compiler2 recursion in main thread.
4881 // Add in BytesPerWord times page size to account for VM stack during
4882 // class initialization depending on 32 or 64 bit VM.
4883 guarantee((Solaris::min_stack_allowed >=
4884 (StackYellowPages+StackRedPages+StackShadowPages+BytesPerWord
4885 COMPILER2_PRESENT(+1)) * page_size),
4886 "need to increase Solaris::min_stack_allowed on this platform");
4887
4888 size_t threadStackSizeInBytes = ThreadStackSize * K;
4889 if (threadStackSizeInBytes != 0 &&
4890 threadStackSizeInBytes < Solaris::min_stack_allowed) {
4891 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4892 Solaris::min_stack_allowed/K);
4893 return JNI_ERR;
4894 }
4895
4896 // For 64kbps there will be a 64kb page size, which makes
4897 // the usable default stack size quite a bit less. Increase the
4898 // stack for 64kb (or any > than 8kb) pages, this increases
4899 // virtual memory fragmentation (since we're not creating the
4900 // stack on a power of 2 boundary. The real fix for this
4901 // should be to fix the guard page mechanism.
4902
4903 if (vm_page_size() > 8*K) {
4904 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4905 ? threadStackSizeInBytes +
4906 ((StackYellowPages + StackRedPages) * vm_page_size())
4907 : 0;
4908 ThreadStackSize = threadStackSizeInBytes/K;
4909 }
4910
4911 // Make the stack size a multiple of the page size so that
4912 // the yellow/red zones can be guarded.
4913 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4914 vm_page_size()));
4915
4916 Solaris::libthread_init();
4917
4918 if (UseNUMA) {
4919 if (!Solaris::liblgrp_init()) {
4920 UseNUMA = false;
4921 } else {
4922 size_t lgrp_limit = os::numa_get_groups_num();
4923 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit);
4924 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4925 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4926 if (lgrp_num < 2) {
4927 // There's only one locality group, disable NUMA.
4928 UseNUMA = false;
4929 }
4930 }
4931 if (!UseNUMA && ForceNUMA) {
4932 UseNUMA = true;
4933 }
4934 }
4935
4936 Solaris::signal_sets_init();
4937 Solaris::init_signal_mem();
4938 Solaris::install_signal_handlers();
4939
4940 if (libjsigversion < JSIG_VERSION_1_4_1) {
4941 Maxlibjsigsigs = OLDMAXSIGNUM;
4942 }
4943
4944 // initialize synchronization primitives to use either thread or
4945 // lwp synchronization (controlled by UseLWPSynchronization)
4946 Solaris::synchronization_init();
4947
4948 if (MaxFDLimit) {
4949 // set the number of file descriptors to max. print out error
4950 // if getrlimit/setrlimit fails but continue regardless.
4951 struct rlimit nbr_files;
4952 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4953 if (status != 0) {
4954 if (PrintMiscellaneous && (Verbose || WizardMode))
4955 perror("os::init_2 getrlimit failed");
4956 } else {
4957 nbr_files.rlim_cur = nbr_files.rlim_max;
4958 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4959 if (status != 0) {
4960 if (PrintMiscellaneous && (Verbose || WizardMode))
4961 perror("os::init_2 setrlimit failed");
4962 }
4963 }
4964 }
4965
4966 // Initialize HPI.
4967 jint hpi_result = hpi::initialize();
4968 if (hpi_result != JNI_OK) {
4969 tty->print_cr("There was an error trying to initialize the HPI library.");
4970 return hpi_result;
4971 }
4972
4973 // Calculate theoretical max. size of Threads to guard gainst
4974 // artifical out-of-memory situations, where all available address-
4975 // space has been reserved by thread stacks. Default stack size is 1Mb.
4976 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4977 JavaThread::stack_size_at_create() : (1*K*K);
4978 assert(pre_thread_stack_size != 0, "Must have a stack");
4979 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4980 // we should start doing Virtual Memory banging. Currently when the threads will
4981 // have used all but 200Mb of space.
4982 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4983 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4984
4985 // at-exit methods are called in the reverse order of their registration.
4986 // In Solaris 7 and earlier, atexit functions are called on return from
4987 // main or as a result of a call to exit(3C). There can be only 32 of
4988 // these functions registered and atexit() does not set errno. In Solaris
4989 // 8 and later, there is no limit to the number of functions registered
4990 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4991 // functions are called upon dlclose(3DL) in addition to return from main
4992 // and exit(3C).
4993
4994 if (PerfAllowAtExitRegistration) {
4995 // only register atexit functions if PerfAllowAtExitRegistration is set.
4996 // atexit functions can be delayed until process exit time, which
4997 // can be problematic for embedded VM situations. Embedded VMs should
4998 // call DestroyJavaVM() to assure that VM resources are released.
4999
5000 // note: perfMemory_exit_helper atexit function may be removed in
5001 // the future if the appropriate cleanup code can be added to the
5002 // VM_Exit VMOperation's doit method.
5003 if (atexit(perfMemory_exit_helper) != 0) {
5004 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5005 }
5006 }
5007
5008 // Init pset_loadavg function pointer
5009 init_pset_getloadavg_ptr();
5010
5011 return JNI_OK;
5012 }
5013
5014 void os::init_3(void) {
5015 return;
5016 }
5017
5018 // Mark the polling page as unreadable
5019 void os::make_polling_page_unreadable(void) {
5020 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5021 fatal("Could not disable polling page");
5022 };
5023
5024 // Mark the polling page as readable
5025 void os::make_polling_page_readable(void) {
5026 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5027 fatal("Could not enable polling page");
5028 };
5029
5030 // OS interface.
5031
5032 int os::stat(const char *path, struct stat *sbuf) {
5033 char pathbuf[MAX_PATH];
5034 if (strlen(path) > MAX_PATH - 1) {
5035 errno = ENAMETOOLONG;
5036 return -1;
5037 }
5038 hpi::native_path(strcpy(pathbuf, path));
5039 return ::stat(pathbuf, sbuf);
5040 }
5041
5042
5043 bool os::check_heap(bool force) { return true; }
5044
5045 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5046 static vsnprintf_t sol_vsnprintf = NULL;
5047
5048 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5049 if (!sol_vsnprintf) {
5050 //search for the named symbol in the objects that were loaded after libjvm
5051 void* where = RTLD_NEXT;
5052 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5053 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5054 if (!sol_vsnprintf){
5055 //search for the named symbol in the objects that were loaded before libjvm
5056 where = RTLD_DEFAULT;
5057 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5058 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5059 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5060 }
5061 }
5062 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5063 }
5064
5065
5066 // Is a (classpath) directory empty?
5067 bool os::dir_is_empty(const char* path) {
5068 DIR *dir = NULL;
5069 struct dirent *ptr;
5070
5071 dir = opendir(path);
5072 if (dir == NULL) return true;
5073
5074 /* Scan the directory */
5075 bool result = true;
5076 char buf[sizeof(struct dirent) + MAX_PATH];
5077 struct dirent *dbuf = (struct dirent *) buf;
5078 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5079 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5080 result = false;
5081 }
5082 }
5083 closedir(dir);
5084 return result;
5085 }
5086
5087 // create binary file, rewriting existing file if required
5088 int os::create_binary_file(const char* path, bool rewrite_existing) {
5089 int oflags = O_WRONLY | O_CREAT;
5090 if (!rewrite_existing) {
5091 oflags |= O_EXCL;
5092 }
5093 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5094 }
5095
5096 // return current position of file pointer
5097 jlong os::current_file_offset(int fd) {
5098 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5099 }
5100
5101 // move file pointer to the specified offset
5102 jlong os::seek_to_file_offset(int fd, jlong offset) {
5103 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5104 }
5105
5106 // Map a block of memory.
5107 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
5108 char *addr, size_t bytes, bool read_only,
5109 bool allow_exec) {
5110 int prot;
5111 int flags;
5112
5113 if (read_only) {
5114 prot = PROT_READ;
5115 flags = MAP_SHARED;
5116 } else {
5117 prot = PROT_READ | PROT_WRITE;
5118 flags = MAP_PRIVATE;
5119 }
5120
5121 if (allow_exec) {
5122 prot |= PROT_EXEC;
5123 }
5124
5125 if (addr != NULL) {
5126 flags |= MAP_FIXED;
5127 }
5128
5129 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5130 fd, file_offset);
5131 if (mapped_address == MAP_FAILED) {
5132 return NULL;
5133 }
5134 return mapped_address;
5135 }
5136
5137
5138 // Remap a block of memory.
5139 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
5140 char *addr, size_t bytes, bool read_only,
5141 bool allow_exec) {
5142 // same as map_memory() on this OS
5143 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5144 allow_exec);
5145 }
5146
5147
5148 // Unmap a block of memory.
5149 bool os::unmap_memory(char* addr, size_t bytes) {
5150 return munmap(addr, bytes) == 0;
5151 }
5152
5153 void os::pause() {
5154 char filename[MAX_PATH];
5155 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5156 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5157 } else {
5158 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5159 }
5160
5161 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5162 if (fd != -1) {
5163 struct stat buf;
5164 close(fd);
5165 while (::stat(filename, &buf) == 0) {
5166 (void)::poll(NULL, 0, 100);
5167 }
5168 } else {
5169 jio_fprintf(stderr,
5170 "Could not open pause file '%s', continuing immediately.\n", filename);
5171 }
5172 }
5173
5174 #ifndef PRODUCT
5175 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5176 // Turn this on if you need to trace synch operations.
5177 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5178 // and call record_synch_enable and record_synch_disable
5179 // around the computation of interest.
5180
5181 void record_synch(char* name, bool returning); // defined below
5182
5183 class RecordSynch {
5184 char* _name;
5185 public:
5186 RecordSynch(char* name) :_name(name)
5187 { record_synch(_name, false); }
5188 ~RecordSynch() { record_synch(_name, true); }
5189 };
5190
5191 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5192 extern "C" ret name params { \
5193 typedef ret name##_t params; \
5194 static name##_t* implem = NULL; \
5195 static int callcount = 0; \
5196 if (implem == NULL) { \
5197 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5198 if (implem == NULL) fatal(dlerror()); \
5199 } \
5200 ++callcount; \
5201 RecordSynch _rs(#name); \
5202 inner; \
5203 return implem args; \
5204 }
5205 // in dbx, examine callcounts this way:
5206 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5207
5208 #define CHECK_POINTER_OK(p) \
5209 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p)))
5210 #define CHECK_MU \
5211 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5212 #define CHECK_CV \
5213 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5214 #define CHECK_P(p) \
5215 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5216
5217 #define CHECK_MUTEX(mutex_op) \
5218 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5219
5220 CHECK_MUTEX( mutex_lock)
5221 CHECK_MUTEX( _mutex_lock)
5222 CHECK_MUTEX( mutex_unlock)
5223 CHECK_MUTEX(_mutex_unlock)
5224 CHECK_MUTEX( mutex_trylock)
5225 CHECK_MUTEX(_mutex_trylock)
5226
5227 #define CHECK_COND(cond_op) \
5228 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5229
5230 CHECK_COND( cond_wait);
5231 CHECK_COND(_cond_wait);
5232 CHECK_COND(_cond_wait_cancel);
5233
5234 #define CHECK_COND2(cond_op) \
5235 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5236
5237 CHECK_COND2( cond_timedwait);
5238 CHECK_COND2(_cond_timedwait);
5239 CHECK_COND2(_cond_timedwait_cancel);
5240
5241 // do the _lwp_* versions too
5242 #define mutex_t lwp_mutex_t
5243 #define cond_t lwp_cond_t
5244 CHECK_MUTEX( _lwp_mutex_lock)
5245 CHECK_MUTEX( _lwp_mutex_unlock)
5246 CHECK_MUTEX( _lwp_mutex_trylock)
5247 CHECK_MUTEX( __lwp_mutex_lock)
5248 CHECK_MUTEX( __lwp_mutex_unlock)
5249 CHECK_MUTEX( __lwp_mutex_trylock)
5250 CHECK_MUTEX(___lwp_mutex_lock)
5251 CHECK_MUTEX(___lwp_mutex_unlock)
5252
5253 CHECK_COND( _lwp_cond_wait);
5254 CHECK_COND( __lwp_cond_wait);
5255 CHECK_COND(___lwp_cond_wait);
5256
5257 CHECK_COND2( _lwp_cond_timedwait);
5258 CHECK_COND2( __lwp_cond_timedwait);
5259 #undef mutex_t
5260 #undef cond_t
5261
5262 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5263 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5264 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5265 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5266 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5267 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5268 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5269 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5270
5271
5272 // recording machinery:
5273
5274 enum { RECORD_SYNCH_LIMIT = 200 };
5275 char* record_synch_name[RECORD_SYNCH_LIMIT];
5276 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5277 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5278 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5279 int record_synch_count = 0;
5280 bool record_synch_enabled = false;
5281
5282 // in dbx, examine recorded data this way:
5283 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5284
5285 void record_synch(char* name, bool returning) {
5286 if (record_synch_enabled) {
5287 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5288 record_synch_name[record_synch_count] = name;
5289 record_synch_returning[record_synch_count] = returning;
5290 record_synch_thread[record_synch_count] = thr_self();
5291 record_synch_arg0ptr[record_synch_count] = &name;
5292 record_synch_count++;
5293 }
5294 // put more checking code here:
5295 // ...
5296 }
5297 }
5298
5299 void record_synch_enable() {
5300 // start collecting trace data, if not already doing so
5301 if (!record_synch_enabled) record_synch_count = 0;
5302 record_synch_enabled = true;
5303 }
5304
5305 void record_synch_disable() {
5306 // stop collecting trace data
5307 record_synch_enabled = false;
5308 }
5309
5310 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5311 #endif // PRODUCT
5312
5313 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5314 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5315 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5316
5317
5318 // JVMTI & JVM monitoring and management support
5319 // The thread_cpu_time() and current_thread_cpu_time() are only
5320 // supported if is_thread_cpu_time_supported() returns true.
5321 // They are not supported on Solaris T1.
5322
5323 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5324 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5325 // of a thread.
5326 //
5327 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5328 // returns the fast estimate available on the platform.
5329
5330 // hrtime_t gethrvtime() return value includes
5331 // user time but does not include system time
5332 jlong os::current_thread_cpu_time() {
5333 return (jlong) gethrvtime();
5334 }
5335
5336 jlong os::thread_cpu_time(Thread *thread) {
5337 // return user level CPU time only to be consistent with
5338 // what current_thread_cpu_time returns.
5339 // thread_cpu_time_info() must be changed if this changes
5340 return os::thread_cpu_time(thread, false /* user time only */);
5341 }
5342
5343 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5344 if (user_sys_cpu_time) {
5345 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5346 } else {
5347 return os::current_thread_cpu_time();
5348 }
5349 }
5350
5351 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5352 char proc_name[64];
5353 int count;
5354 prusage_t prusage;
5355 jlong lwp_time;
5356 int fd;
5357
5358 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5359 getpid(),
5360 thread->osthread()->lwp_id());
5361 fd = open(proc_name, O_RDONLY);
5362 if ( fd == -1 ) return -1;
5363
5364 do {
5365 count = pread(fd,
5366 (void *)&prusage.pr_utime,
5367 thr_time_size,
5368 thr_time_off);
5369 } while (count < 0 && errno == EINTR);
5370 close(fd);
5371 if ( count < 0 ) return -1;
5372
5373 if (user_sys_cpu_time) {
5374 // user + system CPU time
5375 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5376 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5377 (jlong)prusage.pr_stime.tv_nsec +
5378 (jlong)prusage.pr_utime.tv_nsec;
5379 } else {
5380 // user level CPU time only
5381 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5382 (jlong)prusage.pr_utime.tv_nsec;
5383 }
5384
5385 return(lwp_time);
5386 }
5387
5388 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5389 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5390 info_ptr->may_skip_backward = false; // elapsed time not wall time
5391 info_ptr->may_skip_forward = false; // elapsed time not wall time
5392 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5393 }
5394
5395 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5396 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5397 info_ptr->may_skip_backward = false; // elapsed time not wall time
5398 info_ptr->may_skip_forward = false; // elapsed time not wall time
5399 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5400 }
5401
5402 bool os::is_thread_cpu_time_supported() {
5403 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5404 return true;
5405 } else {
5406 return false;
5407 }
5408 }
5409
5410 // System loadavg support. Returns -1 if load average cannot be obtained.
5411 // Return the load average for our processor set if the primitive exists
5412 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5413 int os::loadavg(double loadavg[], int nelem) {
5414 if (pset_getloadavg_ptr != NULL) {
5415 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5416 } else {
5417 return ::getloadavg(loadavg, nelem);
5418 }
5419 }
5420
5421 //---------------------------------------------------------------------------------
5422
5423 static address same_page(address x, address y) {
5424 intptr_t page_bits = -os::vm_page_size();
5425 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
5426 return x;
5427 else if (x > y)
5428 return (address)(intptr_t(y) | ~page_bits) + 1;
5429 else
5430 return (address)(intptr_t(y) & page_bits);
5431 }
5432
5433 bool os::find(address addr, outputStream* st) {
5434 Dl_info dlinfo;
5435 memset(&dlinfo, 0, sizeof(dlinfo));
5436 if (dladdr(addr, &dlinfo)) {
5437 #ifdef _LP64
5438 st->print("0x%016lx: ", addr);
5439 #else
5440 st->print("0x%08x: ", addr);
5441 #endif
5442 if (dlinfo.dli_sname != NULL)
5443 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5444 else if (dlinfo.dli_fname)
5445 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5446 else
5447 st->print("<absolute address>");
5448 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname);
5449 #ifdef _LP64
5450 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase);
5451 #else
5452 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase);
5453 #endif
5454 st->cr();
5455
5456 if (Verbose) {
5457 // decode some bytes around the PC
5458 address begin = same_page(addr-40, addr);
5459 address end = same_page(addr+40, addr);
5460 address lowest = (address) dlinfo.dli_sname;
5461 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5462 if (begin < lowest) begin = lowest;
5463 Dl_info dlinfo2;
5464 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5465 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5466 end = (address) dlinfo2.dli_saddr;
5467 Disassembler::decode(begin, end, st);
5468 }
5469 return true;
5470 }
5471 return false;
5472 }
5473
5474 // Following function has been added to support HotSparc's libjvm.so running
5475 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5476 // src/solaris/hpi/native_threads in the EVM codebase.
5477 //
5478 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5479 // libraries and should thus be removed. We will leave it behind for a while
5480 // until we no longer want to able to run on top of 1.3.0 Solaris production
5481 // JDK. See 4341971.
5482
5483 #define STACK_SLACK 0x800
5484
5485 extern "C" {
5486 intptr_t sysThreadAvailableStackWithSlack() {
5487 stack_t st;
5488 intptr_t retval, stack_top;
5489 retval = thr_stksegment(&st);
5490 assert(retval == 0, "incorrect return value from thr_stksegment");
5491 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5492 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5493 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5494 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5495 }
5496 }
5497
5498 // Just to get the Kernel build to link on solaris for testing.
5499
5500 extern "C" {
5501 class ASGCT_CallTrace;
5502 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext)
5503 KERNEL_RETURN;
5504 }
5505
5506
5507 // ObjectMonitor park-unpark infrastructure ...
5508 //
5509 // We implement Solaris and Linux PlatformEvents with the
5510 // obvious condvar-mutex-flag triple.
5511 // Another alternative that works quite well is pipes:
5512 // Each PlatformEvent consists of a pipe-pair.
5513 // The thread associated with the PlatformEvent
5514 // calls park(), which reads from the input end of the pipe.
5515 // Unpark() writes into the other end of the pipe.
5516 // The write-side of the pipe must be set NDELAY.
5517 // Unfortunately pipes consume a large # of handles.
5518 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5519 // Using pipes for the 1st few threads might be workable, however.
5520 //
5521 // park() is permitted to return spuriously.
5522 // Callers of park() should wrap the call to park() in
5523 // an appropriate loop. A litmus test for the correct
5524 // usage of park is the following: if park() were modified
5525 // to immediately return 0 your code should still work,
5526 // albeit degenerating to a spin loop.
5527 //
5528 // An interesting optimization for park() is to use a trylock()
5529 // to attempt to acquire the mutex. If the trylock() fails
5530 // then we know that a concurrent unpark() operation is in-progress.
5531 // in that case the park() code could simply set _count to 0
5532 // and return immediately. The subsequent park() operation *might*
5533 // return immediately. That's harmless as the caller of park() is
5534 // expected to loop. By using trylock() we will have avoided a
5535 // avoided a context switch caused by contention on the per-thread mutex.
5536 //
5537 // TODO-FIXME:
5538 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5539 // objectmonitor implementation.
5540 // 2. Collapse the JSR166 parker event, and the
5541 // objectmonitor ParkEvent into a single "Event" construct.
5542 // 3. In park() and unpark() add:
5543 // assert (Thread::current() == AssociatedWith).
5544 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5545 // 1-out-of-N park() operations will return immediately.
5546 //
5547 // _Event transitions in park()
5548 // -1 => -1 : illegal
5549 // 1 => 0 : pass - return immediately
5550 // 0 => -1 : block
5551 //
5552 // _Event serves as a restricted-range semaphore.
5553 //
5554 // Another possible encoding of _Event would be with
5555 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5556 //
5557 // TODO-FIXME: add DTRACE probes for:
5558 // 1. Tx parks
5559 // 2. Ty unparks Tx
5560 // 3. Tx resumes from park
5561
5562
5563 // value determined through experimentation
5564 #define ROUNDINGFIX 11
5565
5566 // utility to compute the abstime argument to timedwait.
5567 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5568
5569 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5570 // millis is the relative timeout time
5571 // abstime will be the absolute timeout time
5572 if (millis < 0) millis = 0;
5573 struct timeval now;
5574 int status = gettimeofday(&now, NULL);
5575 assert(status == 0, "gettimeofday");
5576 jlong seconds = millis / 1000;
5577 jlong max_wait_period;
5578
5579 if (UseLWPSynchronization) {
5580 // forward port of fix for 4275818 (not sleeping long enough)
5581 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5582 // _lwp_cond_timedwait() used a round_down algorithm rather
5583 // than a round_up. For millis less than our roundfactor
5584 // it rounded down to 0 which doesn't meet the spec.
5585 // For millis > roundfactor we may return a bit sooner, but
5586 // since we can not accurately identify the patch level and
5587 // this has already been fixed in Solaris 9 and 8 we will
5588 // leave it alone rather than always rounding down.
5589
5590 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5591 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5592 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5593 max_wait_period = 21000000;
5594 } else {
5595 max_wait_period = 50000000;
5596 }
5597 millis %= 1000;
5598 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5599 seconds = max_wait_period;
5600 }
5601 abstime->tv_sec = now.tv_sec + seconds;
5602 long usec = now.tv_usec + millis * 1000;
5603 if (usec >= 1000000) {
5604 abstime->tv_sec += 1;
5605 usec -= 1000000;
5606 }
5607 abstime->tv_nsec = usec * 1000;
5608 return abstime;
5609 }
5610
5611 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5612 // Conceptually TryPark() should be equivalent to park(0).
5613
5614 int os::PlatformEvent::TryPark() {
5615 for (;;) {
5616 const int v = _Event ;
5617 guarantee ((v == 0) || (v == 1), "invariant") ;
5618 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5619 }
5620 }
5621
5622 void os::PlatformEvent::park() { // AKA: down()
5623 // Invariant: Only the thread associated with the Event/PlatformEvent
5624 // may call park().
5625 int v ;
5626 for (;;) {
5627 v = _Event ;
5628 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5629 }
5630 guarantee (v >= 0, "invariant") ;
5631 if (v == 0) {
5632 // Do this the hard way by blocking ...
5633 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5634 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5635 // Only for SPARC >= V8PlusA
5636 #if defined(__sparc) && defined(COMPILER2)
5637 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5638 #endif
5639 int status = os::Solaris::mutex_lock(_mutex);
5640 assert_status(status == 0, status, "mutex_lock");
5641 guarantee (_nParked == 0, "invariant") ;
5642 ++ _nParked ;
5643 while (_Event < 0) {
5644 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5645 // Treat this the same as if the wait was interrupted
5646 // With usr/lib/lwp going to kernel, always handle ETIME
5647 status = os::Solaris::cond_wait(_cond, _mutex);
5648 if (status == ETIME) status = EINTR ;
5649 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5650 }
5651 -- _nParked ;
5652 _Event = 0 ;
5653 status = os::Solaris::mutex_unlock(_mutex);
5654 assert_status(status == 0, status, "mutex_unlock");
5655 }
5656 }
5657
5658 int os::PlatformEvent::park(jlong millis) {
5659 guarantee (_nParked == 0, "invariant") ;
5660 int v ;
5661 for (;;) {
5662 v = _Event ;
5663 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5664 }
5665 guarantee (v >= 0, "invariant") ;
5666 if (v != 0) return OS_OK ;
5667
5668 int ret = OS_TIMEOUT;
5669 timestruc_t abst;
5670 compute_abstime (&abst, millis);
5671
5672 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5673 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5674 // Only for SPARC >= V8PlusA
5675 #if defined(__sparc) && defined(COMPILER2)
5676 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5677 #endif
5678 int status = os::Solaris::mutex_lock(_mutex);
5679 assert_status(status == 0, status, "mutex_lock");
5680 guarantee (_nParked == 0, "invariant") ;
5681 ++ _nParked ;
5682 while (_Event < 0) {
5683 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5684 assert_status(status == 0 || status == EINTR ||
5685 status == ETIME || status == ETIMEDOUT,
5686 status, "cond_timedwait");
5687 if (!FilterSpuriousWakeups) break ; // previous semantics
5688 if (status == ETIME || status == ETIMEDOUT) break ;
5689 // We consume and ignore EINTR and spurious wakeups.
5690 }
5691 -- _nParked ;
5692 if (_Event >= 0) ret = OS_OK ;
5693 _Event = 0 ;
5694 status = os::Solaris::mutex_unlock(_mutex);
5695 assert_status(status == 0, status, "mutex_unlock");
5696 return ret;
5697 }
5698
5699 void os::PlatformEvent::unpark() {
5700 int v, AnyWaiters;
5701
5702 // Increment _Event.
5703 // Another acceptable implementation would be to simply swap 1
5704 // into _Event:
5705 // if (Swap (&_Event, 1) < 0) {
5706 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ;
5707 // if (AnyWaiters) cond_signal (_cond) ;
5708 // }
5709
5710 for (;;) {
5711 v = _Event ;
5712 if (v > 0) {
5713 // The LD of _Event could have reordered or be satisfied
5714 // by a read-aside from this processor's write buffer.
5715 // To avoid problems execute a barrier and then
5716 // ratify the value. A degenerate CAS() would also work.
5717 // Viz., CAS (v+0, &_Event, v) == v).
5718 OrderAccess::fence() ;
5719 if (_Event == v) return ;
5720 continue ;
5721 }
5722 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
5723 }
5724
5725 // If the thread associated with the event was parked, wake it.
5726 if (v < 0) {
5727 int status ;
5728 // Wait for the thread assoc with the PlatformEvent to vacate.
5729 status = os::Solaris::mutex_lock(_mutex);
5730 assert_status(status == 0, status, "mutex_lock");
5731 AnyWaiters = _nParked ;
5732 status = os::Solaris::mutex_unlock(_mutex);
5733 assert_status(status == 0, status, "mutex_unlock");
5734 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
5735 if (AnyWaiters != 0) {
5736 // We intentional signal *after* dropping the lock
5737 // to avoid a common class of futile wakeups.
5738 status = os::Solaris::cond_signal(_cond);
5739 assert_status(status == 0, status, "cond_signal");
5740 }
5741 }
5742 }
5743
5744 // JSR166
5745 // -------------------------------------------------------
5746
5747 /*
5748 * The solaris and linux implementations of park/unpark are fairly
5749 * conservative for now, but can be improved. They currently use a
5750 * mutex/condvar pair, plus _counter.
5751 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5752 * sets count to 1 and signals condvar. Only one thread ever waits
5753 * on the condvar. Contention seen when trying to park implies that someone
5754 * is unparking you, so don't wait. And spurious returns are fine, so there
5755 * is no need to track notifications.
5756 */
5757
5758 #define NANOSECS_PER_SEC 1000000000
5759 #define NANOSECS_PER_MILLISEC 1000000
5760 #define MAX_SECS 100000000
5761
5762 /*
5763 * This code is common to linux and solaris and will be moved to a
5764 * common place in dolphin.
5765 *
5766 * The passed in time value is either a relative time in nanoseconds
5767 * or an absolute time in milliseconds. Either way it has to be unpacked
5768 * into suitable seconds and nanoseconds components and stored in the
5769 * given timespec structure.
5770 * Given time is a 64-bit value and the time_t used in the timespec is only
5771 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5772 * overflow if times way in the future are given. Further on Solaris versions
5773 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5774 * number of seconds, in abstime, is less than current_time + 100,000,000.
5775 * As it will be 28 years before "now + 100000000" will overflow we can
5776 * ignore overflow and just impose a hard-limit on seconds using the value
5777 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5778 * years from "now".
5779 */
5780 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5781 assert (time > 0, "convertTime");
5782
5783 struct timeval now;
5784 int status = gettimeofday(&now, NULL);
5785 assert(status == 0, "gettimeofday");
5786
5787 time_t max_secs = now.tv_sec + MAX_SECS;
5788
5789 if (isAbsolute) {
5790 jlong secs = time / 1000;
5791 if (secs > max_secs) {
5792 absTime->tv_sec = max_secs;
5793 }
5794 else {
5795 absTime->tv_sec = secs;
5796 }
5797 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5798 }
5799 else {
5800 jlong secs = time / NANOSECS_PER_SEC;
5801 if (secs >= MAX_SECS) {
5802 absTime->tv_sec = max_secs;
5803 absTime->tv_nsec = 0;
5804 }
5805 else {
5806 absTime->tv_sec = now.tv_sec + secs;
5807 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5808 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5809 absTime->tv_nsec -= NANOSECS_PER_SEC;
5810 ++absTime->tv_sec; // note: this must be <= max_secs
5811 }
5812 }
5813 }
5814 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5815 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5816 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5817 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5818 }
5819
5820 void Parker::park(bool isAbsolute, jlong time) {
5821
5822 // Optional fast-path check:
5823 // Return immediately if a permit is available.
5824 if (_counter > 0) {
5825 _counter = 0 ;
5826 OrderAccess::fence();
5827 return ;
5828 }
5829
5830 // Optional fast-exit: Check interrupt before trying to wait
5831 Thread* thread = Thread::current();
5832 assert(thread->is_Java_thread(), "Must be JavaThread");
5833 JavaThread *jt = (JavaThread *)thread;
5834 if (Thread::is_interrupted(thread, false)) {
5835 return;
5836 }
5837
5838 // First, demultiplex/decode time arguments
5839 timespec absTime;
5840 if (time < 0) { // don't wait at all
5841 return;
5842 }
5843 if (time > 0) {
5844 // Warning: this code might be exposed to the old Solaris time
5845 // round-down bugs. Grep "roundingFix" for details.
5846 unpackTime(&absTime, isAbsolute, time);
5847 }
5848
5849 // Enter safepoint region
5850 // Beware of deadlocks such as 6317397.
5851 // The per-thread Parker:: _mutex is a classic leaf-lock.
5852 // In particular a thread must never block on the Threads_lock while
5853 // holding the Parker:: mutex. If safepoints are pending both the
5854 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5855 ThreadBlockInVM tbivm(jt);
5856
5857 // Don't wait if cannot get lock since interference arises from
5858 // unblocking. Also. check interrupt before trying wait
5859 if (Thread::is_interrupted(thread, false) ||
5860 os::Solaris::mutex_trylock(_mutex) != 0) {
5861 return;
5862 }
5863
5864 int status ;
5865
5866 if (_counter > 0) { // no wait needed
5867 _counter = 0;
5868 status = os::Solaris::mutex_unlock(_mutex);
5869 assert (status == 0, "invariant") ;
5870 OrderAccess::fence();
5871 return;
5872 }
5873
5874 #ifdef ASSERT
5875 // Don't catch signals while blocked; let the running threads have the signals.
5876 // (This allows a debugger to break into the running thread.)
5877 sigset_t oldsigs;
5878 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5879 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5880 #endif
5881
5882 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5883 jt->set_suspend_equivalent();
5884 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5885
5886 // Do this the hard way by blocking ...
5887 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5888 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5889 // Only for SPARC >= V8PlusA
5890 #if defined(__sparc) && defined(COMPILER2)
5891 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5892 #endif
5893
5894 if (time == 0) {
5895 status = os::Solaris::cond_wait (_cond, _mutex) ;
5896 } else {
5897 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5898 }
5899 // Note that an untimed cond_wait() can sometimes return ETIME on older
5900 // versions of the Solaris.
5901 assert_status(status == 0 || status == EINTR ||
5902 status == ETIME || status == ETIMEDOUT,
5903 status, "cond_timedwait");
5904
5905 #ifdef ASSERT
5906 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
5907 #endif
5908 _counter = 0 ;
5909 status = os::Solaris::mutex_unlock(_mutex);
5910 assert_status(status == 0, status, "mutex_unlock") ;
5911
5912 // If externally suspended while waiting, re-suspend
5913 if (jt->handle_special_suspend_equivalent_condition()) {
5914 jt->java_suspend_self();
5915 }
5916 OrderAccess::fence();
5917 }
5918
5919 void Parker::unpark() {
5920 int s, status ;
5921 status = os::Solaris::mutex_lock (_mutex) ;
5922 assert (status == 0, "invariant") ;
5923 s = _counter;
5924 _counter = 1;
5925 status = os::Solaris::mutex_unlock (_mutex) ;
5926 assert (status == 0, "invariant") ;
5927
5928 if (s < 1) {
5929 status = os::Solaris::cond_signal (_cond) ;
5930 assert (status == 0, "invariant") ;
5931 }
5932 }
5933
5934 extern char** environ;
5935
5936 // Run the specified command in a separate process. Return its exit value,
5937 // or -1 on failure (e.g. can't fork a new process).
5938 // Unlike system(), this function can be called from signal handler. It
5939 // doesn't block SIGINT et al.
5940 int os::fork_and_exec(char* cmd) {
5941 char * argv[4];
5942 argv[0] = (char *)"sh";
5943 argv[1] = (char *)"-c";
5944 argv[2] = cmd;
5945 argv[3] = NULL;
5946
5947 // fork is async-safe, fork1 is not so can't use in signal handler
5948 pid_t pid;
5949 Thread* t = ThreadLocalStorage::get_thread_slow();
5950 if (t != NULL && t->is_inside_signal_handler()) {
5951 pid = fork();
5952 } else {
5953 pid = fork1();
5954 }
5955
5956 if (pid < 0) {
5957 // fork failed
5958 warning("fork failed: %s", strerror(errno));
5959 return -1;
5960
5961 } else if (pid == 0) {
5962 // child process
5963
5964 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5965 execve("/usr/bin/sh", argv, environ);
5966
5967 // execve failed
5968 _exit(-1);
5969
5970 } else {
5971 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5972 // care about the actual exit code, for now.
5973
5974 int status;
5975
5976 // Wait for the child process to exit. This returns immediately if
5977 // the child has already exited. */
5978 while (waitpid(pid, &status, 0) < 0) {
5979 switch (errno) {
5980 case ECHILD: return 0;
5981 case EINTR: break;
5982 default: return -1;
5983 }
5984 }
5985
5986 if (WIFEXITED(status)) {
5987 // The child exited normally; get its exit code.
5988 return WEXITSTATUS(status);
5989 } else if (WIFSIGNALED(status)) {
5990 // The child exited because of a signal
5991 // The best value to return is 0x80 + signal number,
5992 // because that is what all Unix shells do, and because
5993 // it allows callers to distinguish between process exit and
5994 // process death by signal.
5995 return 0x80 + WTERMSIG(status);
5996 } else {
5997 // Unknown exit code; pass it through
5998 return status;
5999 }
6000 }
6001 }
6002
6003 // is_headless_jre()
6004 //
6005 // Test for the existence of libmawt in motif21 or xawt directories
6006 // in order to report if we are running in a headless jre
6007 //
6008 bool os::is_headless_jre() {
6009 struct stat statbuf;
6010 char buf[MAXPATHLEN];
6011 char libmawtpath[MAXPATHLEN];
6012 const char *xawtstr = "/xawt/libmawt.so";
6013 const char *motifstr = "/motif21/libmawt.so";
6014 char *p;
6015
6016 // Get path to libjvm.so
6017 os::jvm_path(buf, sizeof(buf));
6018
6019 // Get rid of libjvm.so
6020 p = strrchr(buf, '/');
6021 if (p == NULL) return false;
6022 else *p = '\0';
6023
6024 // Get rid of client or server
6025 p = strrchr(buf, '/');
6026 if (p == NULL) return false;
6027 else *p = '\0';
6028
6029 // check xawt/libmawt.so
6030 strcpy(libmawtpath, buf);
6031 strcat(libmawtpath, xawtstr);
6032 if (::stat(libmawtpath, &statbuf) == 0) return false;
6033
6034 // check motif21/libmawt.so
6035 strcpy(libmawtpath, buf);
6036 strcat(libmawtpath, motifstr);
6037 if (::stat(libmawtpath, &statbuf) == 0) return false;
6038
6039 return true;
6040 }
6041
6042