Wed, 01 Apr 2009 16:38:01 -0400
6819213: revive sun.boot.library.path
Summary: Support multiplex and mutable sun.boot.library.path
Reviewed-by: acorn, dcubed, xlu
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // do not include precompiled header file
26 # include "incls/_os_solaris.cpp.incl"
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>
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>
70 #define MAX_PATH (2 * K)
72 // for timer info max values which include all bits
73 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
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
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.
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.
98 */
100 #ifndef MC_HAT_ADVISE
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 */
111 #endif
112 // MPSS Changes End.
115 // Here are some liblgrp types from sys/lgrp_user.h to be able to
116 // compile on older systems without this header file.
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
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
132 // Some more macros from sys/mman.h that are not present in Solaris 8.
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 */
151 /* maximum number of addresses meminfo() can process at a time */
152 # define MAX_MEMINFO_CNT 256
154 /* maximum number of request types */
155 # define MAX_MEMINFO_REQ 31
156 #endif
158 // see thr_setprio(3T) for the basis of these numbers
159 #define MinimumPriority 0
160 #define NormalPriority 64
161 #define MaximumPriority 127
163 // Values for ThreadPriorityPolicy == 1
164 int prio_policy1[MaxPriority+1] = { -99999, 0, 16, 32, 48, 64,
165 80, 96, 112, 124, 127 };
167 // System parameters used internally
168 static clock_t clock_tics_per_sec = 100;
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;
175 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
176 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
178 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
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; }
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 }
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 }
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};
204 #ifndef PRODUCT
205 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
207 int ThreadLocalStorage::_tcacheHit = 0;
208 int ThreadLocalStorage::_tcacheMiss = 0;
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
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");
229 thread->_self_raw_id = raw_id; // mark for quick retrieval
230 _get_thread_cache[ index ] = thread;
231 }
232 return thread;
233 }
236 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
237 #define NO_CACHED_THREAD ((Thread*)all_zero)
239 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
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);
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 }
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 }
258 // Invalidate all the caches (happens to be the same as pd_init).
259 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
261 #undef NO_CACHED_THREAD
263 // END Thread Local Storage
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 }
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 }
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;
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 }
308 size_t os::current_stack_size() {
309 size_t size;
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 }
326 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
327 return localtime_r(clock, res);
328 }
330 // interruptible infrastructure
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
339 void os::Solaris::setup_interruptible(JavaThread* thread) {
341 JavaThreadState thread_state = thread->thread_state();
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 }
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 }
357 JavaThread* os::Solaris::setup_interruptible() {
358 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
359 setup_interruptible(thread);
360 return thread;
361 }
363 void os::Solaris::try_enable_extended_io() {
364 typedef int (*enable_extended_FILE_stdio_t)(int, int);
366 if (!UseExtendedFileIO) {
367 return;
368 }
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 }
379 #ifdef ASSERT
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 }
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
394 // cleanup_interruptible reverses the effects of setup_interruptible
395 // setup_interruptible_already_blocked() does not need any cleanup.
397 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
398 OSThread* osthread = thread->osthread();
400 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
401 }
403 // I/O interruption related counters called in _INTERRUPTIBLE
405 void os::Solaris::bump_interrupted_before_count() {
406 RuntimeService::record_interrupted_before_count();
407 }
409 void os::Solaris::bump_interrupted_during_count() {
410 RuntimeService::record_interrupted_during_count();
411 }
413 static int _processors_online = 0;
415 jint os::Solaris::_os_thread_limit = 0;
416 volatile jint os::Solaris::_os_thread_count = 0;
418 julong os::available_memory() {
419 return Solaris::available_memory();
420 }
422 julong os::Solaris::available_memory() {
423 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
424 }
426 julong os::Solaris::_physical_memory = 0;
428 julong os::physical_memory() {
429 return Solaris::physical_memory();
430 }
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 }
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
459 void os::Solaris::initialize_system_info() {
460 _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 }
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 }
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 }
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.
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 }
547 return true;
548 }
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 }
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 }
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 }
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 }
666 // Return true if user is running as root.
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 }
679 static char* get_property(char* name, char* buffer, int buffer_size) {
680 if (os::getenv(name, buffer, buffer_size)) {
681 return buffer;
682 }
683 static char empty[] = "";
684 return empty;
685 }
688 void os::init_system_properties_values() {
689 char arch[12];
690 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
692 // The next steps are taken in the product version:
693 //
694 // Obtain the JAVA_HOME value from the location of libjvm[_g].so.
695 // This library should be located at:
696 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so.
697 //
698 // If "/jre/lib/" appears at the right place in the path, then we
699 // assume libjvm[_g].so is installed in a JDK and we use this path.
700 //
701 // Otherwise exit with message: "Could not create the Java virtual machine."
702 //
703 // The following extra steps are taken in the debugging version:
704 //
705 // If "/jre/lib/" does NOT appear at the right place in the path
706 // instead of exit check for $JAVA_HOME environment variable.
707 //
708 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
709 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so
710 // it looks like libjvm[_g].so is installed there
711 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so.
712 //
713 // Otherwise exit.
714 //
715 // Important note: if the location of libjvm.so changes this
716 // code needs to be changed accordingly.
718 // The next few definitions allow the code to be verbatim:
719 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n))
720 #define free(p) FREE_C_HEAP_ARRAY(char, p)
721 #define getenv(n) ::getenv(n)
723 #define EXTENSIONS_DIR "/lib/ext"
724 #define ENDORSED_DIR "/lib/endorsed"
725 #define COMMON_DIR "/usr/jdk/packages"
727 {
728 /* sysclasspath, java_home, dll_dir */
729 {
730 char *home_path;
731 char *dll_path;
732 char *pslash;
733 char buf[MAXPATHLEN];
734 os::jvm_path(buf, sizeof(buf));
736 // Found the full path to libjvm.so.
737 // Now cut the path to <java_home>/jre if we can.
738 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
739 pslash = strrchr(buf, '/');
740 if (pslash != NULL)
741 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
742 dll_path = malloc(strlen(buf) + 1);
743 if (dll_path == NULL)
744 return;
745 strcpy(dll_path, buf);
746 Arguments::set_dll_dir(dll_path);
748 if (pslash != NULL) {
749 pslash = strrchr(buf, '/');
750 if (pslash != NULL) {
751 *pslash = '\0'; /* get rid of /<arch> */
752 pslash = strrchr(buf, '/');
753 if (pslash != NULL)
754 *pslash = '\0'; /* get rid of /lib */
755 }
756 }
758 home_path = malloc(strlen(buf) + 1);
759 if (home_path == NULL)
760 return;
761 strcpy(home_path, buf);
762 Arguments::set_java_home(home_path);
764 if (!set_boot_path('/', ':'))
765 return;
766 }
768 /*
769 * Where to look for native libraries
770 */
771 {
772 // Use dlinfo() to determine the correct java.library.path.
773 //
774 // If we're launched by the Java launcher, and the user
775 // does not set java.library.path explicitly on the commandline,
776 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
777 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
778 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
779 // /usr/lib), which is exactly what we want.
780 //
781 // If the user does set java.library.path, it completely
782 // overwrites this setting, and always has.
783 //
784 // If we're not launched by the Java launcher, we may
785 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
786 // settings. Again, dlinfo does exactly what we want.
788 Dl_serinfo _info, *info = &_info;
789 Dl_serpath *path;
790 char* library_path;
791 char *common_path;
792 int i;
794 // determine search path count and required buffer size
795 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
796 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
797 }
799 // allocate new buffer and initialize
800 info = (Dl_serinfo*)malloc(_info.dls_size);
801 if (info == NULL) {
802 vm_exit_out_of_memory(_info.dls_size,
803 "init_system_properties_values info");
804 }
805 info->dls_size = _info.dls_size;
806 info->dls_cnt = _info.dls_cnt;
808 // obtain search path information
809 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
810 free(info);
811 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
812 }
814 path = &info->dls_serpath[0];
816 // Note: Due to a legacy implementation, most of the library path
817 // is set in the launcher. This was to accomodate linking restrictions
818 // on legacy Solaris implementations (which are no longer supported).
819 // Eventually, all the library path setting will be done here.
820 //
821 // However, to prevent the proliferation of improperly built native
822 // libraries, the new path component /usr/jdk/packages is added here.
824 // Determine the actual CPU architecture.
825 char cpu_arch[12];
826 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
827 #ifdef _LP64
828 // If we are a 64-bit vm, perform the following translations:
829 // sparc -> sparcv9
830 // i386 -> amd64
831 if (strcmp(cpu_arch, "sparc") == 0)
832 strcat(cpu_arch, "v9");
833 else if (strcmp(cpu_arch, "i386") == 0)
834 strcpy(cpu_arch, "amd64");
835 #endif
837 // Construct the invariant part of ld_library_path. Note that the
838 // space for the colon and the trailing null are provided by the
839 // nulls included by the sizeof operator.
840 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
841 common_path = malloc(bufsize);
842 if (common_path == NULL) {
843 free(info);
844 vm_exit_out_of_memory(bufsize,
845 "init_system_properties_values common_path");
846 }
847 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
849 // struct size is more than sufficient for the path components obtained
850 // through the dlinfo() call, so only add additional space for the path
851 // components explicitly added here.
852 bufsize = info->dls_size + strlen(common_path);
853 library_path = malloc(bufsize);
854 if (library_path == NULL) {
855 free(info);
856 free(common_path);
857 vm_exit_out_of_memory(bufsize,
858 "init_system_properties_values library_path");
859 }
860 library_path[0] = '\0';
862 // Construct the desired Java library path from the linker's library
863 // search path.
864 //
865 // For compatibility, it is optimal that we insert the additional path
866 // components specific to the Java VM after those components specified
867 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
868 // infrastructure.
869 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
870 strcpy(library_path, common_path);
871 } else {
872 int inserted = 0;
873 for (i = 0; i < info->dls_cnt; i++, path++) {
874 uint_t flags = path->dls_flags & LA_SER_MASK;
875 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
876 strcat(library_path, common_path);
877 strcat(library_path, os::path_separator());
878 inserted = 1;
879 }
880 strcat(library_path, path->dls_name);
881 strcat(library_path, os::path_separator());
882 }
883 // eliminate trailing path separator
884 library_path[strlen(library_path)-1] = '\0';
885 }
887 // happens before argument parsing - can't use a trace flag
888 // tty->print_raw("init_system_properties_values: native lib path: ");
889 // tty->print_raw_cr(library_path);
891 // callee copies into its own buffer
892 Arguments::set_library_path(library_path);
894 free(common_path);
895 free(library_path);
896 free(info);
897 }
899 /*
900 * Extensions directories.
901 *
902 * Note that the space for the colon and the trailing null are provided
903 * by the nulls included by the sizeof operator (so actually one byte more
904 * than necessary is allocated).
905 */
906 {
907 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
908 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
909 sizeof(EXTENSIONS_DIR));
910 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
911 Arguments::get_java_home());
912 Arguments::set_ext_dirs(buf);
913 }
915 /* Endorsed standards default directory. */
916 {
917 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
918 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
919 Arguments::set_endorsed_dirs(buf);
920 }
921 }
923 #undef malloc
924 #undef free
925 #undef getenv
926 #undef EXTENSIONS_DIR
927 #undef ENDORSED_DIR
928 #undef COMMON_DIR
930 }
932 void os::breakpoint() {
933 BREAKPOINT;
934 }
936 bool os::obsolete_option(const JavaVMOption *option)
937 {
938 if (!strncmp(option->optionString, "-Xt", 3)) {
939 return true;
940 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
941 return true;
942 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
943 return true;
944 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
945 return true;
946 }
947 return false;
948 }
950 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
951 address stackStart = (address)thread->stack_base();
952 address stackEnd = (address)(stackStart - (address)thread->stack_size());
953 if (sp < stackStart && sp >= stackEnd ) return true;
954 return false;
955 }
957 extern "C" void breakpoint() {
958 // use debugger to set breakpoint here
959 }
961 // Returns an estimate of the current stack pointer. Result must be guaranteed to
962 // point into the calling threads stack, and be no lower than the current stack
963 // pointer.
964 address os::current_stack_pointer() {
965 volatile int dummy;
966 address sp = (address)&dummy + 8; // %%%% need to confirm if this is right
967 return sp;
968 }
970 static thread_t main_thread;
972 // Thread start routine for all new Java threads
973 extern "C" void* java_start(void* thread_addr) {
974 // Try to randomize the cache line index of hot stack frames.
975 // This helps when threads of the same stack traces evict each other's
976 // cache lines. The threads can be either from the same JVM instance, or
977 // from different JVM instances. The benefit is especially true for
978 // processors with hyperthreading technology.
979 static int counter = 0;
980 int pid = os::current_process_id();
981 alloca(((pid ^ counter++) & 7) * 128);
983 int prio;
984 Thread* thread = (Thread*)thread_addr;
985 OSThread* osthr = thread->osthread();
987 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
988 thread->_schedctl = (void *) schedctl_init () ;
990 if (UseNUMA) {
991 int lgrp_id = os::numa_get_group_id();
992 if (lgrp_id != -1) {
993 thread->set_lgrp_id(lgrp_id);
994 }
995 }
997 // If the creator called set priority before we started,
998 // we need to call set priority now that we have an lwp.
999 // Get the priority from libthread and set the priority
1000 // for the new Solaris lwp.
1001 if ( osthr->thread_id() != -1 ) {
1002 if ( UseThreadPriorities ) {
1003 thr_getprio(osthr->thread_id(), &prio);
1004 if (ThreadPriorityVerbose) {
1005 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT ", setting priority: %d\n",
1006 osthr->thread_id(), osthr->lwp_id(), prio );
1007 }
1008 os::set_native_priority(thread, prio);
1009 }
1010 } else if (ThreadPriorityVerbose) {
1011 warning("Can't set priority in _start routine, thread id hasn't been set\n");
1012 }
1014 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
1016 // initialize signal mask for this thread
1017 os::Solaris::hotspot_sigmask(thread);
1019 thread->run();
1021 // One less thread is executing
1022 // When the VMThread gets here, the main thread may have already exited
1023 // which frees the CodeHeap containing the Atomic::dec code
1024 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
1025 Atomic::dec(&os::Solaris::_os_thread_count);
1026 }
1028 if (UseDetachedThreads) {
1029 thr_exit(NULL);
1030 ShouldNotReachHere();
1031 }
1032 return NULL;
1033 }
1035 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
1036 // Allocate the OSThread object
1037 OSThread* osthread = new OSThread(NULL, NULL);
1038 if (osthread == NULL) return NULL;
1040 // Store info on the Solaris thread into the OSThread
1041 osthread->set_thread_id(thread_id);
1042 osthread->set_lwp_id(_lwp_self());
1043 thread->_schedctl = (void *) schedctl_init () ;
1045 if (UseNUMA) {
1046 int lgrp_id = os::numa_get_group_id();
1047 if (lgrp_id != -1) {
1048 thread->set_lgrp_id(lgrp_id);
1049 }
1050 }
1052 if ( ThreadPriorityVerbose ) {
1053 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1054 osthread->thread_id(), osthread->lwp_id() );
1055 }
1057 // Initial thread state is INITIALIZED, not SUSPENDED
1058 osthread->set_state(INITIALIZED);
1060 return osthread;
1061 }
1063 void os::Solaris::hotspot_sigmask(Thread* thread) {
1065 //Save caller's signal mask
1066 sigset_t sigmask;
1067 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1068 OSThread *osthread = thread->osthread();
1069 osthread->set_caller_sigmask(sigmask);
1071 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1072 if (!ReduceSignalUsage) {
1073 if (thread->is_VM_thread()) {
1074 // Only the VM thread handles BREAK_SIGNAL ...
1075 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1076 } else {
1077 // ... all other threads block BREAK_SIGNAL
1078 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1079 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1080 }
1081 }
1082 }
1084 bool os::create_attached_thread(JavaThread* thread) {
1085 #ifdef ASSERT
1086 thread->verify_not_published();
1087 #endif
1088 OSThread* osthread = create_os_thread(thread, thr_self());
1089 if (osthread == NULL) {
1090 return false;
1091 }
1093 // Initial thread state is RUNNABLE
1094 osthread->set_state(RUNNABLE);
1095 thread->set_osthread(osthread);
1097 // initialize signal mask for this thread
1098 // and save the caller's signal mask
1099 os::Solaris::hotspot_sigmask(thread);
1101 return true;
1102 }
1104 bool os::create_main_thread(JavaThread* thread) {
1105 #ifdef ASSERT
1106 thread->verify_not_published();
1107 #endif
1108 if (_starting_thread == NULL) {
1109 _starting_thread = create_os_thread(thread, main_thread);
1110 if (_starting_thread == NULL) {
1111 return false;
1112 }
1113 }
1115 // The primodial thread is runnable from the start
1116 _starting_thread->set_state(RUNNABLE);
1118 thread->set_osthread(_starting_thread);
1120 // initialize signal mask for this thread
1121 // and save the caller's signal mask
1122 os::Solaris::hotspot_sigmask(thread);
1124 return true;
1125 }
1127 // _T2_libthread is true if we believe we are running with the newer
1128 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1129 bool os::Solaris::_T2_libthread = false;
1131 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1132 // Allocate the OSThread object
1133 OSThread* osthread = new OSThread(NULL, NULL);
1134 if (osthread == NULL) {
1135 return false;
1136 }
1138 if ( ThreadPriorityVerbose ) {
1139 char *thrtyp;
1140 switch ( thr_type ) {
1141 case vm_thread:
1142 thrtyp = (char *)"vm";
1143 break;
1144 case cgc_thread:
1145 thrtyp = (char *)"cgc";
1146 break;
1147 case pgc_thread:
1148 thrtyp = (char *)"pgc";
1149 break;
1150 case java_thread:
1151 thrtyp = (char *)"java";
1152 break;
1153 case compiler_thread:
1154 thrtyp = (char *)"compiler";
1155 break;
1156 case watcher_thread:
1157 thrtyp = (char *)"watcher";
1158 break;
1159 default:
1160 thrtyp = (char *)"unknown";
1161 break;
1162 }
1163 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1164 }
1166 // Calculate stack size if it's not specified by caller.
1167 if (stack_size == 0) {
1168 // The default stack size 1M (2M for LP64).
1169 stack_size = (BytesPerWord >> 2) * K * K;
1171 switch (thr_type) {
1172 case os::java_thread:
1173 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1174 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1175 break;
1176 case os::compiler_thread:
1177 if (CompilerThreadStackSize > 0) {
1178 stack_size = (size_t)(CompilerThreadStackSize * K);
1179 break;
1180 } // else fall through:
1181 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1182 case os::vm_thread:
1183 case os::pgc_thread:
1184 case os::cgc_thread:
1185 case os::watcher_thread:
1186 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1187 break;
1188 }
1189 }
1190 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1192 // Initial state is ALLOCATED but not INITIALIZED
1193 osthread->set_state(ALLOCATED);
1195 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1196 // We got lots of threads. Check if we still have some address space left.
1197 // Need to be at least 5Mb of unreserved address space. We do check by
1198 // trying to reserve some.
1199 const size_t VirtualMemoryBangSize = 20*K*K;
1200 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1201 if (mem == NULL) {
1202 delete osthread;
1203 return false;
1204 } else {
1205 // Release the memory again
1206 os::release_memory(mem, VirtualMemoryBangSize);
1207 }
1208 }
1210 // Setup osthread because the child thread may need it.
1211 thread->set_osthread(osthread);
1213 // Create the Solaris thread
1214 // explicit THR_BOUND for T2_libthread case in case
1215 // that assumption is not accurate, but our alternate signal stack
1216 // handling is based on it which must have bound threads
1217 thread_t tid = 0;
1218 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1219 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1220 (thr_type == vm_thread) ||
1221 (thr_type == cgc_thread) ||
1222 (thr_type == pgc_thread) ||
1223 (thr_type == compiler_thread && BackgroundCompilation)) ?
1224 THR_BOUND : 0);
1225 int status;
1227 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1228 //
1229 // On multiprocessors systems, libthread sometimes under-provisions our
1230 // process with LWPs. On a 30-way systems, for instance, we could have
1231 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1232 // to our process. This can result in under utilization of PEs.
1233 // I suspect the problem is related to libthread's LWP
1234 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1235 // upcall policy.
1236 //
1237 // The following code is palliative -- it attempts to ensure that our
1238 // process has sufficient LWPs to take advantage of multiple PEs.
1239 // Proper long-term cures include using user-level threads bound to LWPs
1240 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1241 // slight timing window with respect to sampling _os_thread_count, but
1242 // the race is benign. Also, we should periodically recompute
1243 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1244 // the number of PEs in our partition. You might be tempted to use
1245 // THR_NEW_LWP here, but I'd recommend against it as that could
1246 // result in undesirable growth of the libthread's LWP pool.
1247 // The fix below isn't sufficient; for instance, it doesn't take into count
1248 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1249 //
1250 // Some pathologies this scheme doesn't handle:
1251 // * Threads can block, releasing the LWPs. The LWPs can age out.
1252 // When a large number of threads become ready again there aren't
1253 // enough LWPs available to service them. This can occur when the
1254 // number of ready threads oscillates.
1255 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1256 //
1257 // Finally, we should call thr_setconcurrency() periodically to refresh
1258 // the LWP pool and thwart the LWP age-out mechanism.
1259 // The "+3" term provides a little slop -- we want to slightly overprovision.
1261 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1262 if (!(flags & THR_BOUND)) {
1263 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1264 }
1265 }
1266 // Although this doesn't hurt, we should warn of undefined behavior
1267 // when using unbound T1 threads with schedctl(). This should never
1268 // happen, as the compiler and VM threads are always created bound
1269 DEBUG_ONLY(
1270 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1271 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1272 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1273 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1274 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1275 }
1276 );
1279 // Mark that we don't have an lwp or thread id yet.
1280 // In case we attempt to set the priority before the thread starts.
1281 osthread->set_lwp_id(-1);
1282 osthread->set_thread_id(-1);
1284 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1285 if (status != 0) {
1286 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1287 perror("os::create_thread");
1288 }
1289 thread->set_osthread(NULL);
1290 // Need to clean up stuff we've allocated so far
1291 delete osthread;
1292 return false;
1293 }
1295 Atomic::inc(&os::Solaris::_os_thread_count);
1297 // Store info on the Solaris thread into the OSThread
1298 osthread->set_thread_id(tid);
1300 // Remember that we created this thread so we can set priority on it
1301 osthread->set_vm_created();
1303 // Set the default thread priority otherwise use NormalPriority
1305 if ( UseThreadPriorities ) {
1306 thr_setprio(tid, (DefaultThreadPriority == -1) ?
1307 java_to_os_priority[NormPriority] :
1308 DefaultThreadPriority);
1309 }
1311 // Initial thread state is INITIALIZED, not SUSPENDED
1312 osthread->set_state(INITIALIZED);
1314 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1315 return true;
1316 }
1318 /* defined for >= Solaris 10. This allows builds on earlier versions
1319 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1320 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1321 * and -XX:+UseAltSigs does nothing since these should have no conflict
1322 */
1323 #if !defined(SIGJVM1)
1324 #define SIGJVM1 39
1325 #define SIGJVM2 40
1326 #endif
1328 debug_only(static bool signal_sets_initialized = false);
1329 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1330 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1331 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1333 bool os::Solaris::is_sig_ignored(int sig) {
1334 struct sigaction oact;
1335 sigaction(sig, (struct sigaction*)NULL, &oact);
1336 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1337 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1338 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1339 return true;
1340 else
1341 return false;
1342 }
1344 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1345 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1346 static bool isJVM1available() {
1347 return SIGJVM1 < SIGRTMIN;
1348 }
1350 void os::Solaris::signal_sets_init() {
1351 // Should also have an assertion stating we are still single-threaded.
1352 assert(!signal_sets_initialized, "Already initialized");
1353 // Fill in signals that are necessarily unblocked for all threads in
1354 // the VM. Currently, we unblock the following signals:
1355 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1356 // by -Xrs (=ReduceSignalUsage));
1357 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1358 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1359 // the dispositions or masks wrt these signals.
1360 // Programs embedding the VM that want to use the above signals for their
1361 // own purposes must, at this time, use the "-Xrs" option to prevent
1362 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1363 // (See bug 4345157, and other related bugs).
1364 // In reality, though, unblocking these signals is really a nop, since
1365 // these signals are not blocked by default.
1366 sigemptyset(&unblocked_sigs);
1367 sigemptyset(&allowdebug_blocked_sigs);
1368 sigaddset(&unblocked_sigs, SIGILL);
1369 sigaddset(&unblocked_sigs, SIGSEGV);
1370 sigaddset(&unblocked_sigs, SIGBUS);
1371 sigaddset(&unblocked_sigs, SIGFPE);
1373 if (isJVM1available) {
1374 os::Solaris::set_SIGinterrupt(SIGJVM1);
1375 os::Solaris::set_SIGasync(SIGJVM2);
1376 } else if (UseAltSigs) {
1377 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1378 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1379 } else {
1380 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1381 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1382 }
1384 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1385 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1387 if (!ReduceSignalUsage) {
1388 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1389 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1390 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1391 }
1392 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1393 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1394 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1395 }
1396 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1397 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1398 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1399 }
1400 }
1401 // Fill in signals that are blocked by all but the VM thread.
1402 sigemptyset(&vm_sigs);
1403 if (!ReduceSignalUsage)
1404 sigaddset(&vm_sigs, BREAK_SIGNAL);
1405 debug_only(signal_sets_initialized = true);
1407 // For diagnostics only used in run_periodic_checks
1408 sigemptyset(&check_signal_done);
1409 }
1411 // These are signals that are unblocked while a thread is running Java.
1412 // (For some reason, they get blocked by default.)
1413 sigset_t* os::Solaris::unblocked_signals() {
1414 assert(signal_sets_initialized, "Not initialized");
1415 return &unblocked_sigs;
1416 }
1418 // These are the signals that are blocked while a (non-VM) thread is
1419 // running Java. Only the VM thread handles these signals.
1420 sigset_t* os::Solaris::vm_signals() {
1421 assert(signal_sets_initialized, "Not initialized");
1422 return &vm_sigs;
1423 }
1425 // These are signals that are blocked during cond_wait to allow debugger in
1426 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1427 assert(signal_sets_initialized, "Not initialized");
1428 return &allowdebug_blocked_sigs;
1429 }
1431 // First crack at OS-specific initialization, from inside the new thread.
1432 void os::initialize_thread() {
1433 int r = thr_main() ;
1434 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1435 if (r) {
1436 JavaThread* jt = (JavaThread *)Thread::current();
1437 assert(jt != NULL,"Sanity check");
1438 size_t stack_size;
1439 address base = jt->stack_base();
1440 if (Arguments::created_by_java_launcher()) {
1441 // Use 2MB to allow for Solaris 7 64 bit mode.
1442 stack_size = JavaThread::stack_size_at_create() == 0
1443 ? 2048*K : JavaThread::stack_size_at_create();
1445 // There are rare cases when we may have already used more than
1446 // the basic stack size allotment before this method is invoked.
1447 // Attempt to allow for a normally sized java_stack.
1448 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1449 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1450 } else {
1451 // 6269555: If we were not created by a Java launcher, i.e. if we are
1452 // running embedded in a native application, treat the primordial thread
1453 // as much like a native attached thread as possible. This means using
1454 // the current stack size from thr_stksegment(), unless it is too large
1455 // to reliably setup guard pages. A reasonable max size is 8MB.
1456 size_t current_size = current_stack_size();
1457 // This should never happen, but just in case....
1458 if (current_size == 0) current_size = 2 * K * K;
1459 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1460 }
1461 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1462 stack_size = (size_t)(base - bottom);
1464 assert(stack_size > 0, "Stack size calculation problem");
1466 if (stack_size > jt->stack_size()) {
1467 NOT_PRODUCT(
1468 struct rlimit limits;
1469 getrlimit(RLIMIT_STACK, &limits);
1470 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1471 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1472 )
1473 tty->print_cr(
1474 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1475 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1476 "See limit(1) to increase the stack size limit.",
1477 stack_size / K, jt->stack_size() / K);
1478 vm_exit(1);
1479 }
1480 assert(jt->stack_size() >= stack_size,
1481 "Attempt to map more stack than was allocated");
1482 jt->set_stack_size(stack_size);
1483 }
1485 // 5/22/01: Right now alternate signal stacks do not handle
1486 // throwing stack overflow exceptions, see bug 4463178
1487 // Until a fix is found for this, T2 will NOT imply alternate signal
1488 // stacks.
1489 // If using T2 libthread threads, install an alternate signal stack.
1490 // Because alternate stacks associate with LWPs on Solaris,
1491 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1492 // we prefer to explicitly stack bang.
1493 // If not using T2 libthread, but using UseBoundThreads any threads
1494 // (primordial thread, jni_attachCurrentThread) we do not create,
1495 // probably are not bound, therefore they can not have an alternate
1496 // signal stack. Since our stack banging code is generated and
1497 // is shared across threads, all threads must be bound to allow
1498 // using alternate signal stacks. The alternative is to interpose
1499 // on _lwp_create to associate an alt sig stack with each LWP,
1500 // and this could be a problem when the JVM is embedded.
1501 // We would prefer to use alternate signal stacks with T2
1502 // Since there is currently no accurate way to detect T2
1503 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1504 // on installing alternate signal stacks
1507 // 05/09/03: removed alternate signal stack support for Solaris
1508 // The alternate signal stack mechanism is no longer needed to
1509 // handle stack overflow. This is now handled by allocating
1510 // guard pages (red zone) and stackbanging.
1511 // Initially the alternate signal stack mechanism was removed because
1512 // it did not work with T1 llibthread. Alternate
1513 // signal stacks MUST have all threads bound to lwps. Applications
1514 // can create their own threads and attach them without their being
1515 // bound under T1. This is frequently the case for the primordial thread.
1516 // If we were ever to reenable this mechanism we would need to
1517 // use the dynamic check for T2 libthread.
1519 os::Solaris::init_thread_fpu_state();
1520 }
1524 // Free Solaris resources related to the OSThread
1525 void os::free_thread(OSThread* osthread) {
1526 assert(osthread != NULL, "os::free_thread but osthread not set");
1529 // We are told to free resources of the argument thread,
1530 // but we can only really operate on the current thread.
1531 // The main thread must take the VMThread down synchronously
1532 // before the main thread exits and frees up CodeHeap
1533 guarantee((Thread::current()->osthread() == osthread
1534 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1535 if (Thread::current()->osthread() == osthread) {
1536 // Restore caller's signal mask
1537 sigset_t sigmask = osthread->caller_sigmask();
1538 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1539 }
1540 delete osthread;
1541 }
1543 void os::pd_start_thread(Thread* thread) {
1544 int status = thr_continue(thread->osthread()->thread_id());
1545 assert_status(status == 0, status, "thr_continue failed");
1546 }
1549 intx os::current_thread_id() {
1550 return (intx)thr_self();
1551 }
1553 static pid_t _initial_pid = 0;
1555 int os::current_process_id() {
1556 return (int)(_initial_pid ? _initial_pid : getpid());
1557 }
1559 int os::allocate_thread_local_storage() {
1560 // %%% in Win32 this allocates a memory segment pointed to by a
1561 // register. Dan Stein can implement a similar feature in
1562 // Solaris. Alternatively, the VM can do the same thing
1563 // explicitly: malloc some storage and keep the pointer in a
1564 // register (which is part of the thread's context) (or keep it
1565 // in TLS).
1566 // %%% In current versions of Solaris, thr_self and TSD can
1567 // be accessed via short sequences of displaced indirections.
1568 // The value of thr_self is available as %g7(36).
1569 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1570 // assuming that the current thread already has a value bound to k.
1571 // It may be worth experimenting with such access patterns,
1572 // and later having the parameters formally exported from a Solaris
1573 // interface. I think, however, that it will be faster to
1574 // maintain the invariant that %g2 always contains the
1575 // JavaThread in Java code, and have stubs simply
1576 // treat %g2 as a caller-save register, preserving it in a %lN.
1577 thread_key_t tk;
1578 if (thr_keycreate( &tk, NULL ) )
1579 fatal1("os::allocate_thread_local_storage: thr_keycreate failed (%s)", strerror(errno));
1580 return int(tk);
1581 }
1583 void os::free_thread_local_storage(int index) {
1584 // %%% don't think we need anything here
1585 // if ( pthread_key_delete((pthread_key_t) tk) )
1586 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1587 }
1589 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1590 // small number - point is NO swap space available
1591 void os::thread_local_storage_at_put(int index, void* value) {
1592 // %%% this is used only in threadLocalStorage.cpp
1593 if (thr_setspecific((thread_key_t)index, value)) {
1594 if (errno == ENOMEM) {
1595 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space");
1596 } else {
1597 fatal1("os::thread_local_storage_at_put: thr_setspecific failed (%s)", strerror(errno));
1598 }
1599 } else {
1600 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1601 }
1602 }
1604 // This function could be called before TLS is initialized, for example, when
1605 // VM receives an async signal or when VM causes a fatal error during
1606 // initialization. Return NULL if thr_getspecific() fails.
1607 void* os::thread_local_storage_at(int index) {
1608 // %%% this is used only in threadLocalStorage.cpp
1609 void* r = NULL;
1610 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1611 }
1614 const int NANOSECS_PER_MILLISECS = 1000000;
1615 // gethrtime can move backwards if read from one cpu and then a different cpu
1616 // getTimeNanos is guaranteed to not move backward on Solaris
1617 // local spinloop created as faster for a CAS on an int than
1618 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1619 // supported on sparc v8 or pre supports_cx8 intel boxes.
1620 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1621 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1622 inline hrtime_t oldgetTimeNanos() {
1623 int gotlock = LOCK_INVALID;
1624 hrtime_t newtime = gethrtime();
1626 for (;;) {
1627 // grab lock for max_hrtime
1628 int curlock = max_hrtime_lock;
1629 if (curlock & LOCK_BUSY) continue;
1630 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1631 if (newtime > max_hrtime) {
1632 max_hrtime = newtime;
1633 } else {
1634 newtime = max_hrtime;
1635 }
1636 // release lock
1637 max_hrtime_lock = LOCK_FREE;
1638 return newtime;
1639 }
1640 }
1641 // gethrtime can move backwards if read from one cpu and then a different cpu
1642 // getTimeNanos is guaranteed to not move backward on Solaris
1643 inline hrtime_t getTimeNanos() {
1644 if (VM_Version::supports_cx8()) {
1645 const hrtime_t now = gethrtime();
1646 const hrtime_t prev = max_hrtime;
1647 if (now <= prev) return prev; // same or retrograde time;
1648 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1649 assert(obsv >= prev, "invariant"); // Monotonicity
1650 // If the CAS succeeded then we're done and return "now".
1651 // If the CAS failed and the observed value "obs" is >= now then
1652 // we should return "obs". If the CAS failed and now > obs > prv then
1653 // some other thread raced this thread and installed a new value, in which case
1654 // we could either (a) retry the entire operation, (b) retry trying to install now
1655 // or (c) just return obs. We use (c). No loop is required although in some cases
1656 // we might discard a higher "now" value in deference to a slightly lower but freshly
1657 // installed obs value. That's entirely benign -- it admits no new orderings compared
1658 // to (a) or (b) -- and greatly reduces coherence traffic.
1659 // We might also condition (c) on the magnitude of the delta between obs and now.
1660 // Avoiding excessive CAS operations to hot RW locations is critical.
1661 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1662 return (prev == obsv) ? now : obsv ;
1663 } else {
1664 return oldgetTimeNanos();
1665 }
1666 }
1668 // Time since start-up in seconds to a fine granularity.
1669 // Used by VMSelfDestructTimer and the MemProfiler.
1670 double os::elapsedTime() {
1671 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1672 }
1674 jlong os::elapsed_counter() {
1675 return (jlong)(getTimeNanos() - first_hrtime);
1676 }
1678 jlong os::elapsed_frequency() {
1679 return hrtime_hz;
1680 }
1682 // Return the real, user, and system times in seconds from an
1683 // arbitrary fixed point in the past.
1684 bool os::getTimesSecs(double* process_real_time,
1685 double* process_user_time,
1686 double* process_system_time) {
1687 struct tms ticks;
1688 clock_t real_ticks = times(&ticks);
1690 if (real_ticks == (clock_t) (-1)) {
1691 return false;
1692 } else {
1693 double ticks_per_second = (double) clock_tics_per_sec;
1694 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1695 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1696 // For consistency return the real time from getTimeNanos()
1697 // converted to seconds.
1698 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1700 return true;
1701 }
1702 }
1704 bool os::supports_vtime() { return true; }
1706 bool os::enable_vtime() {
1707 int fd = open("/proc/self/ctl", O_WRONLY);
1708 if (fd == -1)
1709 return false;
1711 long cmd[] = { PCSET, PR_MSACCT };
1712 int res = write(fd, cmd, sizeof(long) * 2);
1713 close(fd);
1714 if (res != sizeof(long) * 2)
1715 return false;
1717 return true;
1718 }
1720 bool os::vtime_enabled() {
1721 int fd = open("/proc/self/status", O_RDONLY);
1722 if (fd == -1)
1723 return false;
1725 pstatus_t status;
1726 int res = read(fd, (void*) &status, sizeof(pstatus_t));
1727 close(fd);
1728 if (res != sizeof(pstatus_t))
1729 return false;
1731 return status.pr_flags & PR_MSACCT;
1732 }
1734 double os::elapsedVTime() {
1735 return (double)gethrvtime() / (double)hrtime_hz;
1736 }
1738 // Used internally for comparisons only
1739 // getTimeMillis guaranteed to not move backwards on Solaris
1740 jlong getTimeMillis() {
1741 jlong nanotime = getTimeNanos();
1742 return (jlong)(nanotime / NANOSECS_PER_MILLISECS);
1743 }
1745 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1746 jlong os::javaTimeMillis() {
1747 timeval t;
1748 if (gettimeofday( &t, NULL) == -1)
1749 fatal1("os::javaTimeMillis: gettimeofday (%s)", strerror(errno));
1750 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1751 }
1753 jlong os::javaTimeNanos() {
1754 return (jlong)getTimeNanos();
1755 }
1757 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1758 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1759 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1760 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1761 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1762 }
1764 char * os::local_time_string(char *buf, size_t buflen) {
1765 struct tm t;
1766 time_t long_time;
1767 time(&long_time);
1768 localtime_r(&long_time, &t);
1769 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1770 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1771 t.tm_hour, t.tm_min, t.tm_sec);
1772 return buf;
1773 }
1775 // Note: os::shutdown() might be called very early during initialization, or
1776 // called from signal handler. Before adding something to os::shutdown(), make
1777 // sure it is async-safe and can handle partially initialized VM.
1778 void os::shutdown() {
1780 // allow PerfMemory to attempt cleanup of any persistent resources
1781 perfMemory_exit();
1783 // needs to remove object in file system
1784 AttachListener::abort();
1786 // flush buffered output, finish log files
1787 ostream_abort();
1789 // Check for abort hook
1790 abort_hook_t abort_hook = Arguments::abort_hook();
1791 if (abort_hook != NULL) {
1792 abort_hook();
1793 }
1794 }
1796 // Note: os::abort() might be called very early during initialization, or
1797 // called from signal handler. Before adding something to os::abort(), make
1798 // sure it is async-safe and can handle partially initialized VM.
1799 void os::abort(bool dump_core) {
1800 os::shutdown();
1801 if (dump_core) {
1802 #ifndef PRODUCT
1803 fdStream out(defaultStream::output_fd());
1804 out.print_raw("Current thread is ");
1805 char buf[16];
1806 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1807 out.print_raw_cr(buf);
1808 out.print_raw_cr("Dumping core ...");
1809 #endif
1810 ::abort(); // dump core (for debugging)
1811 }
1813 ::exit(1);
1814 }
1816 // Die immediately, no exit hook, no abort hook, no cleanup.
1817 void os::die() {
1818 _exit(-1);
1819 }
1821 // unused
1822 void os::set_error_file(const char *logfile) {}
1824 // DLL functions
1826 const char* os::dll_file_extension() { return ".so"; }
1828 const char* os::get_temp_directory() { return "/tmp/"; }
1830 static bool file_exists(const char* filename) {
1831 struct stat statbuf;
1832 if (filename == NULL || strlen(filename) == 0) {
1833 return false;
1834 }
1835 return os::stat(filename, &statbuf) == 0;
1836 }
1838 void os::dll_build_name(char* buffer, size_t buflen,
1839 const char* pname, const char* fname) {
1840 // Copied from libhpi
1841 const size_t pnamelen = pname ? strlen(pname) : 0;
1843 // Quietly truncate on buffer overflow. Should be an error.
1844 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1845 *buffer = '\0';
1846 return;
1847 }
1849 if (pnamelen == 0) {
1850 snprintf(buffer, buflen, "lib%s.so", fname);
1851 } else if (strchr(pname, *os::path_separator()) != NULL) {
1852 int n;
1853 char** pelements = split_path(pname, &n);
1854 for (int i = 0 ; i < n ; i++) {
1855 // really shouldn't be NULL but what the heck, check can't hurt
1856 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1857 continue; // skip the empty path values
1858 }
1859 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1860 if (file_exists(buffer)) {
1861 break;
1862 }
1863 }
1864 // release the storage
1865 for (int i = 0 ; i < n ; i++) {
1866 if (pelements[i] != NULL) {
1867 FREE_C_HEAP_ARRAY(char, pelements[i]);
1868 }
1869 }
1870 if (pelements != NULL) {
1871 FREE_C_HEAP_ARRAY(char*, pelements);
1872 }
1873 } else {
1874 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1875 }
1876 }
1878 const char* os::get_current_directory(char *buf, int buflen) {
1879 return getcwd(buf, buflen);
1880 }
1882 // check if addr is inside libjvm[_g].so
1883 bool os::address_is_in_vm(address addr) {
1884 static address libjvm_base_addr;
1885 Dl_info dlinfo;
1887 if (libjvm_base_addr == NULL) {
1888 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1889 libjvm_base_addr = (address)dlinfo.dli_fbase;
1890 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1891 }
1893 if (dladdr((void *)addr, &dlinfo)) {
1894 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1895 }
1897 return false;
1898 }
1900 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1901 static dladdr1_func_type dladdr1_func = NULL;
1903 bool os::dll_address_to_function_name(address addr, char *buf,
1904 int buflen, int * offset) {
1905 Dl_info dlinfo;
1907 // dladdr1_func was initialized in os::init()
1908 if (dladdr1_func){
1909 // yes, we have dladdr1
1911 // Support for dladdr1 is checked at runtime; it may be
1912 // available even if the vm is built on a machine that does
1913 // not have dladdr1 support. Make sure there is a value for
1914 // RTLD_DL_SYMENT.
1915 #ifndef RTLD_DL_SYMENT
1916 #define RTLD_DL_SYMENT 1
1917 #endif
1918 Sym * info;
1919 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1920 RTLD_DL_SYMENT)) {
1921 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1922 if (offset) *offset = addr - (address)dlinfo.dli_saddr;
1924 // check if the returned symbol really covers addr
1925 return ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr);
1926 } else {
1927 if (buf) buf[0] = '\0';
1928 if (offset) *offset = -1;
1929 return false;
1930 }
1931 } else {
1932 // no, only dladdr is available
1933 if(dladdr((void *)addr, &dlinfo)) {
1934 if (buf) jio_snprintf(buf, buflen, dlinfo.dli_sname);
1935 if (offset) *offset = addr - (address)dlinfo.dli_saddr;
1936 return true;
1937 } else {
1938 if (buf) buf[0] = '\0';
1939 if (offset) *offset = -1;
1940 return false;
1941 }
1942 }
1943 }
1945 bool os::dll_address_to_library_name(address addr, char* buf,
1946 int buflen, int* offset) {
1947 Dl_info dlinfo;
1949 if (dladdr((void*)addr, &dlinfo)){
1950 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1951 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
1952 return true;
1953 } else {
1954 if (buf) buf[0] = '\0';
1955 if (offset) *offset = -1;
1956 return false;
1957 }
1958 }
1960 // Prints the names and full paths of all opened dynamic libraries
1961 // for current process
1962 void os::print_dll_info(outputStream * st) {
1963 Dl_info dli;
1964 void *handle;
1965 Link_map *map;
1966 Link_map *p;
1968 st->print_cr("Dynamic libraries:"); st->flush();
1970 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
1971 st->print_cr("Error: Cannot print dynamic libraries.");
1972 return;
1973 }
1974 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1975 if (handle == NULL) {
1976 st->print_cr("Error: Cannot print dynamic libraries.");
1977 return;
1978 }
1979 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1980 if (map == NULL) {
1981 st->print_cr("Error: Cannot print dynamic libraries.");
1982 return;
1983 }
1985 while (map->l_prev != NULL)
1986 map = map->l_prev;
1988 while (map != NULL) {
1989 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1990 map = map->l_next;
1991 }
1993 dlclose(handle);
1994 }
1996 // Loads .dll/.so and
1997 // in case of error it checks if .dll/.so was built for the
1998 // same architecture as Hotspot is running on
2000 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2001 {
2002 void * result= ::dlopen(filename, RTLD_LAZY);
2003 if (result != NULL) {
2004 // Successful loading
2005 return result;
2006 }
2008 Elf32_Ehdr elf_head;
2010 // Read system error message into ebuf
2011 // It may or may not be overwritten below
2012 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2013 ebuf[ebuflen-1]='\0';
2014 int diag_msg_max_length=ebuflen-strlen(ebuf);
2015 char* diag_msg_buf=ebuf+strlen(ebuf);
2017 if (diag_msg_max_length==0) {
2018 // No more space in ebuf for additional diagnostics message
2019 return NULL;
2020 }
2023 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2025 if (file_descriptor < 0) {
2026 // Can't open library, report dlerror() message
2027 return NULL;
2028 }
2030 bool failed_to_read_elf_head=
2031 (sizeof(elf_head)!=
2032 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2034 ::close(file_descriptor);
2035 if (failed_to_read_elf_head) {
2036 // file i/o error - report dlerror() msg
2037 return NULL;
2038 }
2040 typedef struct {
2041 Elf32_Half code; // Actual value as defined in elf.h
2042 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2043 char elf_class; // 32 or 64 bit
2044 char endianess; // MSB or LSB
2045 char* name; // String representation
2046 } arch_t;
2048 static const arch_t arch_array[]={
2049 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2050 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2051 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2052 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2053 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2054 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2055 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2056 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2057 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}
2058 };
2060 #if (defined IA32)
2061 static Elf32_Half running_arch_code=EM_386;
2062 #elif (defined AMD64)
2063 static Elf32_Half running_arch_code=EM_X86_64;
2064 #elif (defined IA64)
2065 static Elf32_Half running_arch_code=EM_IA_64;
2066 #elif (defined __sparc) && (defined _LP64)
2067 static Elf32_Half running_arch_code=EM_SPARCV9;
2068 #elif (defined __sparc) && (!defined _LP64)
2069 static Elf32_Half running_arch_code=EM_SPARC;
2070 #elif (defined __powerpc64__)
2071 static Elf32_Half running_arch_code=EM_PPC64;
2072 #elif (defined __powerpc__)
2073 static Elf32_Half running_arch_code=EM_PPC;
2074 #else
2075 #error Method os::dll_load requires that one of following is defined:\
2076 IA32, AMD64, IA64, __sparc, __powerpc__
2077 #endif
2079 // Identify compatability class for VM's architecture and library's architecture
2080 // Obtain string descriptions for architectures
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;
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 }
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 }
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 }
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 }
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 }
2126 return NULL;
2127 }
2129 void* os::dll_lookup(void* handle, const char* name) {
2130 return dlsym(handle, name);
2131 }
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 }
2140 char buf[32];
2141 int bytes;
2142 while ((bytes = read(fd, buf, sizeof(buf))) > 0) {
2143 st->print_raw(buf, bytes);
2144 }
2146 close(fd);
2148 return true;
2149 }
2151 void os::print_os_info(outputStream* st) {
2152 st->print("OS:");
2154 if (!_print_ascii_file("/etc/release", st)) {
2155 st->print("Solaris");
2156 }
2157 st->cr();
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);
2168 // libthread
2169 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)");
2170 else st->print(" (T1 libthread)");
2171 st->cr();
2173 // rlimit
2174 st->print("rlimit:");
2175 struct rlimit rlim;
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);
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);
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);
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();
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 }
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 }
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 }
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" };
2244 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2245 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2246 "FPE_FLTINV", "FPE_FLTSUB" };
2248 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2250 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2252 void os::print_siginfo(outputStream* st, void* siginfo) {
2253 st->print("siginfo:");
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 }
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 }
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;
2307 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
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 }
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 }
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 }
2339 static void print_signal_handler(outputStream* st, int sig,
2340 char* buf, size_t buflen) {
2341 struct sigaction sa;
2343 sigaction(sig, NULL, &sa);
2345 st->print("%s: ", os::exception_name(sig, buf, buflen));
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);
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 }
2359 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
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 }
2368 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
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 }
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 }
2402 static char saved_jvm_path[MAXPATHLEN] = { 0 };
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 }
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);
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 }
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 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2442 #ifdef _LP64
2443 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2444 if (strcmp(cpu_arch, "sparc") == 0) {
2445 strcat(cpu_arch, "v9");
2446 } else if (strcmp(cpu_arch, "i386") == 0) {
2447 strcpy(cpu_arch, "amd64");
2448 }
2449 #endif
2450 // Check the current module name "libjvm.so" or "libjvm_g.so".
2451 p = strrchr(buf, '/');
2452 assert(strstr(p, "/libjvm") == p, "invalid library name");
2453 p = strstr(p, "_g") ? "_g" : "";
2455 realpath(java_home_var, buf);
2456 sprintf(buf + strlen(buf), "/jre/lib/%s", cpu_arch);
2457 if (0 == access(buf, F_OK)) {
2458 // Use current module name "libjvm[_g].so" instead of
2459 // "libjvm"debug_only("_g")".so" since for fastdebug version
2460 // we should have "libjvm.so" but debug_only("_g") adds "_g"!
2461 // It is used when we are choosing the HPI library's name
2462 // "libhpi[_g].so" in hpi::initialize_get_interface().
2463 sprintf(buf + strlen(buf), "/hotspot/libjvm%s.so", p);
2464 } else {
2465 // Go back to path of .so
2466 realpath((char *)dlinfo.dli_fname, buf);
2467 }
2468 }
2469 }
2470 }
2472 strcpy(saved_jvm_path, buf);
2473 }
2476 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2477 // no prefix required, not even "_"
2478 }
2481 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2482 // no suffix required
2483 }
2486 // sun.misc.Signal
2488 extern "C" {
2489 static void UserHandler(int sig, void *siginfo, void *context) {
2490 // Ctrl-C is pressed during error reporting, likely because the error
2491 // handler fails to abort. Let VM die immediately.
2492 if (sig == SIGINT && is_error_reported()) {
2493 os::die();
2494 }
2496 os::signal_notify(sig);
2497 // We do not need to reinstate the signal handler each time...
2498 }
2499 }
2501 void* os::user_handler() {
2502 return CAST_FROM_FN_PTR(void*, UserHandler);
2503 }
2505 extern "C" {
2506 typedef void (*sa_handler_t)(int);
2507 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2508 }
2510 void* os::signal(int signal_number, void* handler) {
2511 struct sigaction sigAct, oldSigAct;
2512 sigfillset(&(sigAct.sa_mask));
2513 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2514 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2516 if (sigaction(signal_number, &sigAct, &oldSigAct))
2517 // -1 means registration failed
2518 return (void *)-1;
2520 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2521 }
2523 void os::signal_raise(int signal_number) {
2524 raise(signal_number);
2525 }
2527 /*
2528 * The following code is moved from os.cpp for making this
2529 * code platform specific, which it is by its very nature.
2530 */
2532 // a counter for each possible signal value
2533 static int Sigexit = 0;
2534 static int Maxlibjsigsigs;
2535 static jint *pending_signals = NULL;
2536 static int *preinstalled_sigs = NULL;
2537 static struct sigaction *chainedsigactions = NULL;
2538 static sema_t sig_sem;
2539 typedef int (*version_getting_t)();
2540 version_getting_t os::Solaris::get_libjsig_version = NULL;
2541 static int libjsigversion = NULL;
2543 int os::sigexitnum_pd() {
2544 assert(Sigexit > 0, "signal memory not yet initialized");
2545 return Sigexit;
2546 }
2548 void os::Solaris::init_signal_mem() {
2549 // Initialize signal structures
2550 Maxsignum = SIGRTMAX;
2551 Sigexit = Maxsignum+1;
2552 assert(Maxsignum >0, "Unable to obtain max signal number");
2554 Maxlibjsigsigs = Maxsignum;
2556 // pending_signals has one int per signal
2557 // The additional signal is for SIGEXIT - exit signal to signal_thread
2558 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1));
2559 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2561 if (UseSignalChaining) {
2562 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2563 * (Maxsignum + 1));
2564 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2565 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1));
2566 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2567 }
2568 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ));
2569 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2570 }
2572 void os::signal_init_pd() {
2573 int ret;
2575 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2576 assert(ret == 0, "sema_init() failed");
2577 }
2579 void os::signal_notify(int signal_number) {
2580 int ret;
2582 Atomic::inc(&pending_signals[signal_number]);
2583 ret = ::sema_post(&sig_sem);
2584 assert(ret == 0, "sema_post() failed");
2585 }
2587 static int check_pending_signals(bool wait_for_signal) {
2588 int ret;
2589 while (true) {
2590 for (int i = 0; i < Sigexit + 1; i++) {
2591 jint n = pending_signals[i];
2592 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2593 return i;
2594 }
2595 }
2596 if (!wait_for_signal) {
2597 return -1;
2598 }
2599 JavaThread *thread = JavaThread::current();
2600 ThreadBlockInVM tbivm(thread);
2602 bool threadIsSuspended;
2603 do {
2604 thread->set_suspend_equivalent();
2605 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2606 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2607 ;
2608 assert(ret == 0, "sema_wait() failed");
2610 // were we externally suspended while we were waiting?
2611 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2612 if (threadIsSuspended) {
2613 //
2614 // The semaphore has been incremented, but while we were waiting
2615 // another thread suspended us. We don't want to continue running
2616 // while suspended because that would surprise the thread that
2617 // suspended us.
2618 //
2619 ret = ::sema_post(&sig_sem);
2620 assert(ret == 0, "sema_post() failed");
2622 thread->java_suspend_self();
2623 }
2624 } while (threadIsSuspended);
2625 }
2626 }
2628 int os::signal_lookup() {
2629 return check_pending_signals(false);
2630 }
2632 int os::signal_wait() {
2633 return check_pending_signals(true);
2634 }
2636 ////////////////////////////////////////////////////////////////////////////////
2637 // Virtual Memory
2639 static int page_size = -1;
2641 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2642 // clear this var if support is not available.
2643 static bool has_map_align = true;
2645 int os::vm_page_size() {
2646 assert(page_size != -1, "must call os::init");
2647 return page_size;
2648 }
2650 // Solaris allocates memory by pages.
2651 int os::vm_allocation_granularity() {
2652 assert(page_size != -1, "must call os::init");
2653 return page_size;
2654 }
2656 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2657 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2658 size_t size = bytes;
2659 return
2660 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2661 }
2663 bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2664 bool exec) {
2665 if (commit_memory(addr, bytes, exec)) {
2666 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2667 // If the large page size has been set and the VM
2668 // is using large pages, use the large page size
2669 // if it is smaller than the alignment hint. This is
2670 // a case where the VM wants to use a larger alignment size
2671 // for its own reasons but still want to use large pages
2672 // (which is what matters to setting the mpss range.
2673 size_t page_size = 0;
2674 if (large_page_size() < alignment_hint) {
2675 assert(UseLargePages, "Expected to be here for large page use only");
2676 page_size = large_page_size();
2677 } else {
2678 // If the alignment hint is less than the large page
2679 // size, the VM wants a particular alignment (thus the hint)
2680 // for internal reasons. Try to set the mpss range using
2681 // the alignment_hint.
2682 page_size = alignment_hint;
2683 }
2684 // Since this is a hint, ignore any failures.
2685 (void)Solaris::set_mpss_range(addr, bytes, page_size);
2686 }
2687 return true;
2688 }
2689 return false;
2690 }
2692 // Uncommit the pages in a specified region.
2693 void os::free_memory(char* addr, size_t bytes) {
2694 if (madvise(addr, bytes, MADV_FREE) < 0) {
2695 debug_only(warning("MADV_FREE failed."));
2696 return;
2697 }
2698 }
2700 // Change the page size in a given range.
2701 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2702 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2703 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2704 Solaris::set_mpss_range(addr, bytes, alignment_hint);
2705 }
2707 // Tell the OS to make the range local to the first-touching LWP
2708 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2709 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2710 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2711 debug_only(warning("MADV_ACCESS_LWP failed."));
2712 }
2713 }
2715 // Tell the OS that this range would be accessed from different LWPs.
2716 void os::numa_make_global(char *addr, size_t bytes) {
2717 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2718 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2719 debug_only(warning("MADV_ACCESS_MANY failed."));
2720 }
2721 }
2723 // Get the number of the locality groups.
2724 size_t os::numa_get_groups_num() {
2725 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2726 return n != -1 ? n : 1;
2727 }
2729 // Get a list of leaf locality groups. A leaf lgroup is group that
2730 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2731 // board. An LWP is assigned to one of these groups upon creation.
2732 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2733 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2734 ids[0] = 0;
2735 return 1;
2736 }
2737 int result_size = 0, top = 1, bottom = 0, cur = 0;
2738 for (int k = 0; k < size; k++) {
2739 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2740 (Solaris::lgrp_id_t*)&ids[top], size - top);
2741 if (r == -1) {
2742 ids[0] = 0;
2743 return 1;
2744 }
2745 if (!r) {
2746 // That's a leaf node.
2747 assert (bottom <= cur, "Sanity check");
2748 // Check if the node has memory
2749 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2750 NULL, 0, LGRP_RSRC_MEM) > 0) {
2751 ids[bottom++] = ids[cur];
2752 }
2753 }
2754 top += r;
2755 cur++;
2756 }
2757 if (bottom == 0) {
2758 // Handle a situation, when the OS reports no memory available.
2759 // Assume UMA architecture.
2760 ids[0] = 0;
2761 return 1;
2762 }
2763 return bottom;
2764 }
2766 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2767 bool os::numa_topology_changed() {
2768 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2769 if (is_stale != -1 && is_stale) {
2770 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2771 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2772 assert(c != 0, "Failure to initialize LGRP API");
2773 Solaris::set_lgrp_cookie(c);
2774 return true;
2775 }
2776 return false;
2777 }
2779 // Get the group id of the current LWP.
2780 int os::numa_get_group_id() {
2781 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2782 if (lgrp_id == -1) {
2783 return 0;
2784 }
2785 const int size = os::numa_get_groups_num();
2786 int *ids = (int*)alloca(size * sizeof(int));
2788 // Get the ids of all lgroups with memory; r is the count.
2789 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2790 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2791 if (r <= 0) {
2792 return 0;
2793 }
2794 return ids[os::random() % r];
2795 }
2797 // Request information about the page.
2798 bool os::get_page_info(char *start, page_info* info) {
2799 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2800 uint64_t addr = (uintptr_t)start;
2801 uint64_t outdata[2];
2802 uint_t validity = 0;
2804 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2805 return false;
2806 }
2808 info->size = 0;
2809 info->lgrp_id = -1;
2811 if ((validity & 1) != 0) {
2812 if ((validity & 2) != 0) {
2813 info->lgrp_id = outdata[0];
2814 }
2815 if ((validity & 4) != 0) {
2816 info->size = outdata[1];
2817 }
2818 return true;
2819 }
2820 return false;
2821 }
2823 // Scan the pages from start to end until a page different than
2824 // the one described in the info parameter is encountered.
2825 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2826 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2827 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2828 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2829 uint_t validity[MAX_MEMINFO_CNT];
2831 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2832 uint64_t p = (uint64_t)start;
2833 while (p < (uint64_t)end) {
2834 addrs[0] = p;
2835 size_t addrs_count = 1;
2836 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) {
2837 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2838 addrs_count++;
2839 }
2841 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2842 return NULL;
2843 }
2845 size_t i = 0;
2846 for (; i < addrs_count; i++) {
2847 if ((validity[i] & 1) != 0) {
2848 if ((validity[i] & 4) != 0) {
2849 if (outdata[types * i + 1] != page_expected->size) {
2850 break;
2851 }
2852 } else
2853 if (page_expected->size != 0) {
2854 break;
2855 }
2857 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2858 if (outdata[types * i] != page_expected->lgrp_id) {
2859 break;
2860 }
2861 }
2862 } else {
2863 return NULL;
2864 }
2865 }
2867 if (i != addrs_count) {
2868 if ((validity[i] & 2) != 0) {
2869 page_found->lgrp_id = outdata[types * i];
2870 } else {
2871 page_found->lgrp_id = -1;
2872 }
2873 if ((validity[i] & 4) != 0) {
2874 page_found->size = outdata[types * i + 1];
2875 } else {
2876 page_found->size = 0;
2877 }
2878 return (char*)addrs[i];
2879 }
2881 p = addrs[addrs_count - 1] + page_size;
2882 }
2883 return end;
2884 }
2886 bool os::uncommit_memory(char* addr, size_t bytes) {
2887 size_t size = bytes;
2888 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2889 // uncommitted page. Otherwise, the read/write might succeed if we
2890 // have enough swap space to back the physical page.
2891 return
2892 NULL != Solaris::mmap_chunk(addr, size,
2893 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2894 PROT_NONE);
2895 }
2897 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2898 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2900 if (b == MAP_FAILED) {
2901 return NULL;
2902 }
2903 return b;
2904 }
2906 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2907 char* addr = requested_addr;
2908 int flags = MAP_PRIVATE | MAP_NORESERVE;
2910 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2912 if (fixed) {
2913 flags |= MAP_FIXED;
2914 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2915 flags |= MAP_ALIGN;
2916 addr = (char*) alignment_hint;
2917 }
2919 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2920 // uncommitted page. Otherwise, the read/write might succeed if we
2921 // have enough swap space to back the physical page.
2922 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2923 }
2925 char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2926 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2928 guarantee(requested_addr == NULL || requested_addr == addr,
2929 "OS failed to return requested mmap address.");
2930 return addr;
2931 }
2933 // Reserve memory at an arbitrary address, only if that area is
2934 // available (and not reserved for something else).
2936 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2937 const int max_tries = 10;
2938 char* base[max_tries];
2939 size_t size[max_tries];
2941 // Solaris adds a gap between mmap'ed regions. The size of the gap
2942 // is dependent on the requested size and the MMU. Our initial gap
2943 // value here is just a guess and will be corrected later.
2944 bool had_top_overlap = false;
2945 bool have_adjusted_gap = false;
2946 size_t gap = 0x400000;
2948 // Assert only that the size is a multiple of the page size, since
2949 // that's all that mmap requires, and since that's all we really know
2950 // about at this low abstraction level. If we need higher alignment,
2951 // we can either pass an alignment to this method or verify alignment
2952 // in one of the methods further up the call chain. See bug 5044738.
2953 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2955 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2956 // Give it a try, if the kernel honors the hint we can return immediately.
2957 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2958 volatile int err = errno;
2959 if (addr == requested_addr) {
2960 return addr;
2961 } else if (addr != NULL) {
2962 unmap_memory(addr, bytes);
2963 }
2965 if (PrintMiscellaneous && Verbose) {
2966 char buf[256];
2967 buf[0] = '\0';
2968 if (addr == NULL) {
2969 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2970 }
2971 warning("attempt_reserve_memory_at: couldn't reserve %d bytes at "
2972 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2973 "%s", bytes, requested_addr, addr, buf);
2974 }
2976 // Address hint method didn't work. Fall back to the old method.
2977 // In theory, once SNV becomes our oldest supported platform, this
2978 // code will no longer be needed.
2979 //
2980 // Repeatedly allocate blocks until the block is allocated at the
2981 // right spot. Give up after max_tries.
2982 int i;
2983 for (i = 0; i < max_tries; ++i) {
2984 base[i] = reserve_memory(bytes);
2986 if (base[i] != NULL) {
2987 // Is this the block we wanted?
2988 if (base[i] == requested_addr) {
2989 size[i] = bytes;
2990 break;
2991 }
2993 // check that the gap value is right
2994 if (had_top_overlap && !have_adjusted_gap) {
2995 size_t actual_gap = base[i-1] - base[i] - bytes;
2996 if (gap != actual_gap) {
2997 // adjust the gap value and retry the last 2 allocations
2998 assert(i > 0, "gap adjustment code problem");
2999 have_adjusted_gap = true; // adjust the gap only once, just in case
3000 gap = actual_gap;
3001 if (PrintMiscellaneous && Verbose) {
3002 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3003 }
3004 unmap_memory(base[i], bytes);
3005 unmap_memory(base[i-1], size[i-1]);
3006 i-=2;
3007 continue;
3008 }
3009 }
3011 // Does this overlap the block we wanted? Give back the overlapped
3012 // parts and try again.
3013 //
3014 // There is still a bug in this code: if top_overlap == bytes,
3015 // the overlap is offset from requested region by the value of gap.
3016 // In this case giving back the overlapped part will not work,
3017 // because we'll give back the entire block at base[i] and
3018 // therefore the subsequent allocation will not generate a new gap.
3019 // This could be fixed with a new algorithm that used larger
3020 // or variable size chunks to find the requested region -
3021 // but such a change would introduce additional complications.
3022 // It's rare enough that the planets align for this bug,
3023 // so we'll just wait for a fix for 6204603/5003415 which
3024 // will provide a mmap flag to allow us to avoid this business.
3026 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3027 if (top_overlap >= 0 && top_overlap < bytes) {
3028 had_top_overlap = true;
3029 unmap_memory(base[i], top_overlap);
3030 base[i] += top_overlap;
3031 size[i] = bytes - top_overlap;
3032 } else {
3033 size_t bottom_overlap = base[i] + bytes - requested_addr;
3034 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3035 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3036 warning("attempt_reserve_memory_at: possible alignment bug");
3037 }
3038 unmap_memory(requested_addr, bottom_overlap);
3039 size[i] = bytes - bottom_overlap;
3040 } else {
3041 size[i] = bytes;
3042 }
3043 }
3044 }
3045 }
3047 // Give back the unused reserved pieces.
3049 for (int j = 0; j < i; ++j) {
3050 if (base[j] != NULL) {
3051 unmap_memory(base[j], size[j]);
3052 }
3053 }
3055 return (i < max_tries) ? requested_addr : NULL;
3056 }
3058 bool os::release_memory(char* addr, size_t bytes) {
3059 size_t size = bytes;
3060 return munmap(addr, size) == 0;
3061 }
3063 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3064 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3065 "addr must be page aligned");
3066 int retVal = mprotect(addr, bytes, prot);
3067 return retVal == 0;
3068 }
3070 // Protect memory (Used to pass readonly pages through
3071 // JNI GetArray<type>Elements with empty arrays.)
3072 // Also, used for serialization page and for compressed oops null pointer
3073 // checking.
3074 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3075 bool is_committed) {
3076 unsigned int p = 0;
3077 switch (prot) {
3078 case MEM_PROT_NONE: p = PROT_NONE; break;
3079 case MEM_PROT_READ: p = PROT_READ; break;
3080 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3081 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3082 default:
3083 ShouldNotReachHere();
3084 }
3085 // is_committed is unused.
3086 return solaris_mprotect(addr, bytes, p);
3087 }
3089 // guard_memory and unguard_memory only happens within stack guard pages.
3090 // Since ISM pertains only to the heap, guard and unguard memory should not
3091 /// happen with an ISM region.
3092 bool os::guard_memory(char* addr, size_t bytes) {
3093 return solaris_mprotect(addr, bytes, PROT_NONE);
3094 }
3096 bool os::unguard_memory(char* addr, size_t bytes) {
3097 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3098 }
3100 // Large page support
3102 // UseLargePages is the master flag to enable/disable large page memory.
3103 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3104 // effects can be described in the following table:
3105 //
3106 // UseLargePages UseMPSS UseISM
3107 // false * * => UseLargePages is the master switch, turning
3108 // it off will turn off both UseMPSS and
3109 // UseISM. VM will not use large page memory
3110 // regardless the settings of UseMPSS/UseISM.
3111 // true false false => Unless future Solaris provides other
3112 // mechanism to use large page memory, this
3113 // combination is equivalent to -UseLargePages,
3114 // VM will not use large page memory
3115 // true true false => JVM will use MPSS for large page memory.
3116 // This is the default behavior.
3117 // true false true => JVM will use ISM for large page memory.
3118 // true true true => JVM will use ISM if it is available.
3119 // Otherwise, JVM will fall back to MPSS.
3120 // Becaues ISM is now available on all
3121 // supported Solaris versions, this combination
3122 // is equivalent to +UseISM -UseMPSS.
3124 typedef int (*getpagesizes_func_type) (size_t[], int);
3125 static size_t _large_page_size = 0;
3127 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3128 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3129 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3130 // can support multiple page sizes.
3132 // Don't bother to probe page size because getpagesizes() comes with MPSS.
3133 // ISM is only recommended on old Solaris where there is no MPSS support.
3134 // Simply choose a conservative value as default.
3135 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3136 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M);
3138 // ISM is available on all supported Solaris versions
3139 return true;
3140 }
3142 // Insertion sort for small arrays (descending order).
3143 static void insertion_sort_descending(size_t* array, int len) {
3144 for (int i = 0; i < len; i++) {
3145 size_t val = array[i];
3146 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3147 size_t tmp = array[key];
3148 array[key] = array[key - 1];
3149 array[key - 1] = tmp;
3150 }
3151 }
3152 }
3154 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3155 getpagesizes_func_type getpagesizes_func =
3156 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes"));
3157 if (getpagesizes_func == NULL) {
3158 if (warn) {
3159 warning("MPSS is not supported by the operating system.");
3160 }
3161 return false;
3162 }
3164 const unsigned int usable_count = VM_Version::page_size_count();
3165 if (usable_count == 1) {
3166 return false;
3167 }
3169 // Fill the array of page sizes.
3170 int n = getpagesizes_func(_page_sizes, page_sizes_max);
3171 assert(n > 0, "Solaris bug?");
3172 if (n == page_sizes_max) {
3173 // Add a sentinel value (necessary only if the array was completely filled
3174 // since it is static (zeroed at initialization)).
3175 _page_sizes[--n] = 0;
3176 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3177 }
3178 assert(_page_sizes[n] == 0, "missing sentinel");
3180 if (n == 1) return false; // Only one page size available.
3182 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3183 // select up to usable_count elements. First sort the array, find the first
3184 // acceptable value, then copy the usable sizes to the top of the array and
3185 // trim the rest. Make sure to include the default page size :-).
3186 //
3187 // A better policy could get rid of the 4M limit by taking the sizes of the
3188 // important VM memory regions (java heap and possibly the code cache) into
3189 // account.
3190 insertion_sort_descending(_page_sizes, n);
3191 const size_t size_limit =
3192 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3193 int beg;
3194 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3195 const int end = MIN2((int)usable_count, n) - 1;
3196 for (int cur = 0; cur < end; ++cur, ++beg) {
3197 _page_sizes[cur] = _page_sizes[beg];
3198 }
3199 _page_sizes[end] = vm_page_size();
3200 _page_sizes[end + 1] = 0;
3202 if (_page_sizes[end] > _page_sizes[end - 1]) {
3203 // Default page size is not the smallest; sort again.
3204 insertion_sort_descending(_page_sizes, end + 1);
3205 }
3206 *page_size = _page_sizes[0];
3208 return true;
3209 }
3211 bool os::large_page_init() {
3212 if (!UseLargePages) {
3213 UseISM = false;
3214 UseMPSS = false;
3215 return false;
3216 }
3218 // print a warning if any large page related flag is specified on command line
3219 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3220 !FLAG_IS_DEFAULT(UseISM) ||
3221 !FLAG_IS_DEFAULT(UseMPSS) ||
3222 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3223 UseISM = UseISM &&
3224 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3225 if (UseISM) {
3226 // ISM disables MPSS to be compatible with old JDK behavior
3227 UseMPSS = false;
3228 _page_sizes[0] = _large_page_size;
3229 _page_sizes[1] = vm_page_size();
3230 }
3232 UseMPSS = UseMPSS &&
3233 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3235 UseLargePages = UseISM || UseMPSS;
3236 return UseLargePages;
3237 }
3239 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3240 // Signal to OS that we want large pages for addresses
3241 // from addr, addr + bytes
3242 struct memcntl_mha mpss_struct;
3243 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3244 mpss_struct.mha_pagesize = align;
3245 mpss_struct.mha_flags = 0;
3246 if (memcntl(start, bytes, MC_HAT_ADVISE,
3247 (caddr_t) &mpss_struct, 0, 0) < 0) {
3248 debug_only(warning("Attempt to use MPSS failed."));
3249 return false;
3250 }
3251 return true;
3252 }
3254 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3255 // "exec" is passed in but not used. Creating the shared image for
3256 // the code cache doesn't have an SHM_X executable permission to check.
3257 assert(UseLargePages && UseISM, "only for ISM large pages");
3259 size_t size = bytes;
3260 char* retAddr = NULL;
3261 int shmid;
3262 key_t ismKey;
3264 bool warn_on_failure = UseISM &&
3265 (!FLAG_IS_DEFAULT(UseLargePages) ||
3266 !FLAG_IS_DEFAULT(UseISM) ||
3267 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3268 );
3269 char msg[128];
3271 ismKey = IPC_PRIVATE;
3273 // Create a large shared memory region to attach to based on size.
3274 // Currently, size is the total size of the heap
3275 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3276 if (shmid == -1){
3277 if (warn_on_failure) {
3278 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3279 warning(msg);
3280 }
3281 return NULL;
3282 }
3284 // Attach to the region
3285 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3286 int err = errno;
3288 // Remove shmid. If shmat() is successful, the actual shared memory segment
3289 // will be deleted when it's detached by shmdt() or when the process
3290 // terminates. If shmat() is not successful this will remove the shared
3291 // segment immediately.
3292 shmctl(shmid, IPC_RMID, NULL);
3294 if (retAddr == (char *) -1) {
3295 if (warn_on_failure) {
3296 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3297 warning(msg);
3298 }
3299 return NULL;
3300 }
3302 return retAddr;
3303 }
3305 bool os::release_memory_special(char* base, size_t bytes) {
3306 // detaching the SHM segment will also delete it, see reserve_memory_special()
3307 int rslt = shmdt(base);
3308 return rslt == 0;
3309 }
3311 size_t os::large_page_size() {
3312 return _large_page_size;
3313 }
3315 // MPSS allows application to commit large page memory on demand; with ISM
3316 // the entire memory region must be allocated as shared memory.
3317 bool os::can_commit_large_page_memory() {
3318 return UseISM ? false : true;
3319 }
3321 bool os::can_execute_large_page_memory() {
3322 return UseISM ? false : true;
3323 }
3325 static int os_sleep(jlong millis, bool interruptible) {
3326 const jlong limit = INT_MAX;
3327 jlong prevtime;
3328 int res;
3330 while (millis > limit) {
3331 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3332 return res;
3333 millis -= limit;
3334 }
3336 // Restart interrupted polls with new parameters until the proper delay
3337 // has been completed.
3339 prevtime = getTimeMillis();
3341 while (millis > 0) {
3342 jlong newtime;
3344 if (!interruptible) {
3345 // Following assert fails for os::yield_all:
3346 // assert(!thread->is_Java_thread(), "must not be java thread");
3347 res = poll(NULL, 0, millis);
3348 } else {
3349 JavaThread *jt = JavaThread::current();
3351 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3352 os::Solaris::clear_interrupted);
3353 }
3355 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3356 // thread.Interrupt.
3358 if((res == OS_ERR) && (errno == EINTR)) {
3359 newtime = getTimeMillis();
3360 assert(newtime >= prevtime, "time moving backwards");
3361 /* Doing prevtime and newtime in microseconds doesn't help precision,
3362 and trying to round up to avoid lost milliseconds can result in a
3363 too-short delay. */
3364 millis -= newtime - prevtime;
3365 if(millis <= 0)
3366 return OS_OK;
3367 prevtime = newtime;
3368 } else
3369 return res;
3370 }
3372 return OS_OK;
3373 }
3375 // Read calls from inside the vm need to perform state transitions
3376 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3377 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3378 }
3380 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3381 assert(thread == Thread::current(), "thread consistency check");
3383 // TODO-FIXME: this should be removed.
3384 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3385 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3386 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3387 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3388 // is fooled into believing that the system is making progress. In the code below we block the
3389 // the watcher thread while safepoint is in progress so that it would not appear as though the
3390 // system is making progress.
3391 if (!Solaris::T2_libthread() &&
3392 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3393 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3394 // the entire safepoint, the watcher thread will line up here during the safepoint.
3395 Threads_lock->lock_without_safepoint_check();
3396 Threads_lock->unlock();
3397 }
3399 if (thread->is_Java_thread()) {
3400 // This is a JavaThread so we honor the _thread_blocked protocol
3401 // even for sleeps of 0 milliseconds. This was originally done
3402 // as a workaround for bug 4338139. However, now we also do it
3403 // to honor the suspend-equivalent protocol.
3405 JavaThread *jt = (JavaThread *) thread;
3406 ThreadBlockInVM tbivm(jt);
3408 jt->set_suspend_equivalent();
3409 // cleared by handle_special_suspend_equivalent_condition() or
3410 // java_suspend_self() via check_and_wait_while_suspended()
3412 int ret_code;
3413 if (millis <= 0) {
3414 thr_yield();
3415 ret_code = 0;
3416 } else {
3417 // The original sleep() implementation did not create an
3418 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3419 // I'm preserving that decision for now.
3420 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3422 ret_code = os_sleep(millis, interruptible);
3423 }
3425 // were we externally suspended while we were waiting?
3426 jt->check_and_wait_while_suspended();
3428 return ret_code;
3429 }
3431 // non-JavaThread from this point on:
3433 if (millis <= 0) {
3434 thr_yield();
3435 return 0;
3436 }
3438 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3440 return os_sleep(millis, interruptible);
3441 }
3443 int os::naked_sleep() {
3444 // %% make the sleep time an integer flag. for now use 1 millisec.
3445 return os_sleep(1, false);
3446 }
3448 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3449 void os::infinite_sleep() {
3450 while (true) { // sleep forever ...
3451 ::sleep(100); // ... 100 seconds at a time
3452 }
3453 }
3455 // Used to convert frequent JVM_Yield() to nops
3456 bool os::dont_yield() {
3457 if (DontYieldALot) {
3458 static hrtime_t last_time = 0;
3459 hrtime_t diff = getTimeNanos() - last_time;
3461 if (diff < DontYieldALotInterval * 1000000)
3462 return true;
3464 last_time += diff;
3466 return false;
3467 }
3468 else {
3469 return false;
3470 }
3471 }
3473 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3474 // the linux and win32 implementations do not. This should be checked.
3476 void os::yield() {
3477 // Yields to all threads with same or greater priority
3478 os::sleep(Thread::current(), 0, false);
3479 }
3481 // Note that yield semantics are defined by the scheduling class to which
3482 // the thread currently belongs. Typically, yield will _not yield to
3483 // other equal or higher priority threads that reside on the dispatch queues
3484 // of other CPUs.
3486 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3489 // On Solaris we found that yield_all doesn't always yield to all other threads.
3490 // There have been cases where there is a thread ready to execute but it doesn't
3491 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3492 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3493 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3494 // number of times yield_all is called in the one loop and increase the sleep
3495 // time after 8 attempts. If this fails too we increase the concurrency level
3496 // so that the starving thread would get an lwp
3498 void os::yield_all(int attempts) {
3499 // Yields to all threads, including threads with lower priorities
3500 if (attempts == 0) {
3501 os::sleep(Thread::current(), 1, false);
3502 } else {
3503 int iterations = attempts % 30;
3504 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3505 // thr_setconcurrency and _getconcurrency make sense only under T1.
3506 int noofLWPS = thr_getconcurrency();
3507 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3508 thr_setconcurrency(thr_getconcurrency() + 1);
3509 }
3510 } else if (iterations < 25) {
3511 os::sleep(Thread::current(), 1, false);
3512 } else {
3513 os::sleep(Thread::current(), 10, false);
3514 }
3515 }
3516 }
3518 // Called from the tight loops to possibly influence time-sharing heuristics
3519 void os::loop_breaker(int attempts) {
3520 os::yield_all(attempts);
3521 }
3524 // Interface for setting lwp priorities. If we are using T2 libthread,
3525 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3526 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3527 // function is meaningless in this mode so we must adjust the real lwp's priority
3528 // The routines below implement the getting and setting of lwp priorities.
3529 //
3530 // Note: There are three priority scales used on Solaris. Java priotities
3531 // which range from 1 to 10, libthread "thr_setprio" scale which range
3532 // from 0 to 127, and the current scheduling class of the process we
3533 // are running in. This is typically from -60 to +60.
3534 // The setting of the lwp priorities in done after a call to thr_setprio
3535 // so Java priorities are mapped to libthread priorities and we map from
3536 // the latter to lwp priorities. We don't keep priorities stored in
3537 // Java priorities since some of our worker threads want to set priorities
3538 // higher than all Java threads.
3539 //
3540 // For related information:
3541 // (1) man -s 2 priocntl
3542 // (2) man -s 4 priocntl
3543 // (3) man dispadmin
3544 // = librt.so
3545 // = libthread/common/rtsched.c - thrp_setlwpprio().
3546 // = ps -cL <pid> ... to validate priority.
3547 // = sched_get_priority_min and _max
3548 // pthread_create
3549 // sched_setparam
3550 // pthread_setschedparam
3551 //
3552 // Assumptions:
3553 // + We assume that all threads in the process belong to the same
3554 // scheduling class. IE. an homogenous process.
3555 // + Must be root or in IA group to change change "interactive" attribute.
3556 // Priocntl() will fail silently. The only indication of failure is when
3557 // we read-back the value and notice that it hasn't changed.
3558 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3559 // + For RT, change timeslice as well. Invariant:
3560 // constant "priority integral"
3561 // Konst == TimeSlice * (60-Priority)
3562 // Given a priority, compute appropriate timeslice.
3563 // + Higher numerical values have higher priority.
3565 // sched class attributes
3566 typedef struct {
3567 int schedPolicy; // classID
3568 int maxPrio;
3569 int minPrio;
3570 } SchedInfo;
3573 static SchedInfo tsLimits, iaLimits, rtLimits;
3575 #ifdef ASSERT
3576 static int ReadBackValidate = 1;
3577 #endif
3578 static int myClass = 0;
3579 static int myMin = 0;
3580 static int myMax = 0;
3581 static int myCur = 0;
3582 static bool priocntl_enable = false;
3585 // Call the version of priocntl suitable for all supported versions
3586 // of Solaris. We need to call through this wrapper so that we can
3587 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3588 //
3589 // This code should be removed if we ever stop supporting Solaris 8
3590 // and earlier releases.
3592 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3593 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3594 static priocntl_type priocntl_ptr = priocntl_stub;
3596 // Stub to set the value of the real pointer, and then call the real
3597 // function.
3599 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3600 // Try Solaris 8- name only.
3601 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3602 guarantee(tmp != NULL, "priocntl function not found.");
3603 priocntl_ptr = tmp;
3604 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3605 }
3608 // lwp_priocntl_init
3609 //
3610 // Try to determine the priority scale for our process.
3611 //
3612 // Return errno or 0 if OK.
3613 //
3614 static
3615 int lwp_priocntl_init ()
3616 {
3617 int rslt;
3618 pcinfo_t ClassInfo;
3619 pcparms_t ParmInfo;
3620 int i;
3622 if (!UseThreadPriorities) return 0;
3624 // We are using Bound threads, we need to determine our priority ranges
3625 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3626 // If ThreadPriorityPolicy is 1, switch tables
3627 if (ThreadPriorityPolicy == 1) {
3628 for (i = 0 ; i < MaxPriority+1; i++)
3629 os::java_to_os_priority[i] = prio_policy1[i];
3630 }
3631 }
3632 // Not using Bound Threads, set to ThreadPolicy 1
3633 else {
3634 for ( i = 0 ; i < MaxPriority+1; i++ ) {
3635 os::java_to_os_priority[i] = prio_policy1[i];
3636 }
3637 return 0;
3638 }
3641 // Get IDs for a set of well-known scheduling classes.
3642 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3643 // the system. We should have a loop that iterates over the
3644 // classID values, which are known to be "small" integers.
3646 strcpy(ClassInfo.pc_clname, "TS");
3647 ClassInfo.pc_cid = -1;
3648 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3649 if (rslt < 0) return errno;
3650 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3651 tsLimits.schedPolicy = ClassInfo.pc_cid;
3652 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3653 tsLimits.minPrio = -tsLimits.maxPrio;
3655 strcpy(ClassInfo.pc_clname, "IA");
3656 ClassInfo.pc_cid = -1;
3657 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3658 if (rslt < 0) return errno;
3659 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3660 iaLimits.schedPolicy = ClassInfo.pc_cid;
3661 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3662 iaLimits.minPrio = -iaLimits.maxPrio;
3664 strcpy(ClassInfo.pc_clname, "RT");
3665 ClassInfo.pc_cid = -1;
3666 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3667 if (rslt < 0) return errno;
3668 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3669 rtLimits.schedPolicy = ClassInfo.pc_cid;
3670 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3671 rtLimits.minPrio = 0;
3674 // Query our "current" scheduling class.
3675 // This will normally be IA,TS or, rarely, RT.
3676 memset (&ParmInfo, 0, sizeof(ParmInfo));
3677 ParmInfo.pc_cid = PC_CLNULL;
3678 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo );
3679 if ( rslt < 0 ) return errno;
3680 myClass = ParmInfo.pc_cid;
3682 // We now know our scheduling classId, get specific information
3683 // the class.
3684 ClassInfo.pc_cid = myClass;
3685 ClassInfo.pc_clname[0] = 0;
3686 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo );
3687 if ( rslt < 0 ) return errno;
3689 if (ThreadPriorityVerbose)
3690 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3692 memset(&ParmInfo, 0, sizeof(pcparms_t));
3693 ParmInfo.pc_cid = PC_CLNULL;
3694 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3695 if (rslt < 0) return errno;
3697 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3698 myMin = rtLimits.minPrio;
3699 myMax = rtLimits.maxPrio;
3700 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3701 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3702 myMin = iaLimits.minPrio;
3703 myMax = iaLimits.maxPrio;
3704 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3705 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3706 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3707 myMin = tsLimits.minPrio;
3708 myMax = tsLimits.maxPrio;
3709 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3710 } else {
3711 // No clue - punt
3712 if (ThreadPriorityVerbose)
3713 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3714 return EINVAL; // no clue, punt
3715 }
3717 if (ThreadPriorityVerbose)
3718 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3720 priocntl_enable = true; // Enable changing priorities
3721 return 0;
3722 }
3724 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3725 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3726 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3729 // scale_to_lwp_priority
3730 //
3731 // Convert from the libthread "thr_setprio" scale to our current
3732 // lwp scheduling class scale.
3733 //
3734 static
3735 int scale_to_lwp_priority (int rMin, int rMax, int x)
3736 {
3737 int v;
3739 if (x == 127) return rMax; // avoid round-down
3740 v = (((x*(rMax-rMin)))/128)+rMin;
3741 return v;
3742 }
3745 // set_lwp_priority
3746 //
3747 // Set the priority of the lwp. This call should only be made
3748 // when using bound threads (T2 threads are bound by default).
3749 //
3750 int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
3751 {
3752 int rslt;
3753 int Actual, Expected, prv;
3754 pcparms_t ParmInfo; // for GET-SET
3755 #ifdef ASSERT
3756 pcparms_t ReadBack; // for readback
3757 #endif
3759 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3760 // Query current values.
3761 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3762 // Cache "pcparms_t" in global ParmCache.
3763 // TODO: elide set-to-same-value
3765 // If something went wrong on init, don't change priorities.
3766 if ( !priocntl_enable ) {
3767 if (ThreadPriorityVerbose)
3768 tty->print_cr("Trying to set priority but init failed, ignoring");
3769 return EINVAL;
3770 }
3773 // If lwp hasn't started yet, just return
3774 // the _start routine will call us again.
3775 if ( lwpid <= 0 ) {
3776 if (ThreadPriorityVerbose) {
3777 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set",
3778 ThreadID, newPrio);
3779 }
3780 return 0;
3781 }
3783 if (ThreadPriorityVerbose) {
3784 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3785 ThreadID, lwpid, newPrio);
3786 }
3788 memset(&ParmInfo, 0, sizeof(pcparms_t));
3789 ParmInfo.pc_cid = PC_CLNULL;
3790 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3791 if (rslt < 0) return errno;
3793 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3794 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3795 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio);
3796 rtInfo->rt_tqsecs = RT_NOCHANGE;
3797 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3798 if (ThreadPriorityVerbose) {
3799 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3800 }
3801 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3802 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3803 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim);
3804 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio);
3805 iaInfo->ia_uprilim = IA_NOCHANGE;
3806 iaInfo->ia_mode = IA_NOCHANGE;
3807 if (ThreadPriorityVerbose) {
3808 tty->print_cr ("IA: [%d...%d] %d->%d\n",
3809 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3810 }
3811 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3812 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3813 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim);
3814 prv = tsInfo->ts_upri;
3815 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio);
3816 tsInfo->ts_uprilim = IA_NOCHANGE;
3817 if (ThreadPriorityVerbose) {
3818 tty->print_cr ("TS: %d [%d...%d] %d->%d\n",
3819 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3820 }
3821 if (prv == tsInfo->ts_upri) return 0;
3822 } else {
3823 if ( ThreadPriorityVerbose ) {
3824 tty->print_cr ("Unknown scheduling class\n");
3825 }
3826 return EINVAL; // no clue, punt
3827 }
3829 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3830 if (ThreadPriorityVerbose && rslt) {
3831 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3832 }
3833 if (rslt < 0) return errno;
3835 #ifdef ASSERT
3836 // Sanity check: read back what we just attempted to set.
3837 // In theory it could have changed in the interim ...
3838 //
3839 // The priocntl system call is tricky.
3840 // Sometimes it'll validate the priority value argument and
3841 // return EINVAL if unhappy. At other times it fails silently.
3842 // Readbacks are prudent.
3844 if (!ReadBackValidate) return 0;
3846 memset(&ReadBack, 0, sizeof(pcparms_t));
3847 ReadBack.pc_cid = PC_CLNULL;
3848 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3849 assert(rslt >= 0, "priocntl failed");
3850 Actual = Expected = 0xBAD;
3851 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3852 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3853 Actual = RTPRI(ReadBack)->rt_pri;
3854 Expected = RTPRI(ParmInfo)->rt_pri;
3855 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3856 Actual = IAPRI(ReadBack)->ia_upri;
3857 Expected = IAPRI(ParmInfo)->ia_upri;
3858 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3859 Actual = TSPRI(ReadBack)->ts_upri;
3860 Expected = TSPRI(ParmInfo)->ts_upri;
3861 } else {
3862 if ( ThreadPriorityVerbose ) {
3863 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid);
3864 }
3865 }
3867 if (Actual != Expected) {
3868 if ( ThreadPriorityVerbose ) {
3869 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3870 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3871 }
3872 }
3873 #endif
3875 return 0;
3876 }
3880 // Solaris only gives access to 128 real priorities at a time,
3881 // so we expand Java's ten to fill this range. This would be better
3882 // if we dynamically adjusted relative priorities.
3883 //
3884 // The ThreadPriorityPolicy option allows us to select 2 different
3885 // priority scales.
3886 //
3887 // ThreadPriorityPolicy=0
3888 // Since the Solaris' default priority is MaximumPriority, we do not
3889 // set a priority lower than Max unless a priority lower than
3890 // NormPriority is requested.
3891 //
3892 // ThreadPriorityPolicy=1
3893 // This mode causes the priority table to get filled with
3894 // linear values. NormPriority get's mapped to 50% of the
3895 // Maximum priority an so on. This will cause VM threads
3896 // to get unfair treatment against other Solaris processes
3897 // which do not explicitly alter their thread priorities.
3898 //
3901 int os::java_to_os_priority[MaxPriority + 1] = {
3902 -99999, // 0 Entry should never be used
3904 0, // 1 MinPriority
3905 32, // 2
3906 64, // 3
3908 96, // 4
3909 127, // 5 NormPriority
3910 127, // 6
3912 127, // 7
3913 127, // 8
3914 127, // 9 NearMaxPriority
3916 127 // 10 MaxPriority
3917 };
3920 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3921 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3922 if ( !UseThreadPriorities ) return OS_OK;
3923 int status = thr_setprio(thread->osthread()->thread_id(), newpri);
3924 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) )
3925 status |= (set_lwp_priority (thread->osthread()->thread_id(),
3926 thread->osthread()->lwp_id(), newpri ));
3927 return (status == 0) ? OS_OK : OS_ERR;
3928 }
3931 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3932 int p;
3933 if ( !UseThreadPriorities ) {
3934 *priority_ptr = NormalPriority;
3935 return OS_OK;
3936 }
3937 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3938 if (status != 0) {
3939 return OS_ERR;
3940 }
3941 *priority_ptr = p;
3942 return OS_OK;
3943 }
3946 // Hint to the underlying OS that a task switch would not be good.
3947 // Void return because it's a hint and can fail.
3948 void os::hint_no_preempt() {
3949 schedctl_start(schedctl_init());
3950 }
3952 void os::interrupt(Thread* thread) {
3953 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3955 OSThread* osthread = thread->osthread();
3957 int isInterrupted = osthread->interrupted();
3958 if (!isInterrupted) {
3959 osthread->set_interrupted(true);
3960 OrderAccess::fence();
3961 // os::sleep() is implemented with either poll (NULL,0,timeout) or
3962 // by parking on _SleepEvent. If the former, thr_kill will unwedge
3963 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
3964 ParkEvent * const slp = thread->_SleepEvent ;
3965 if (slp != NULL) slp->unpark() ;
3966 }
3968 // For JSR166: unpark after setting status but before thr_kill -dl
3969 if (thread->is_Java_thread()) {
3970 ((JavaThread*)thread)->parker()->unpark();
3971 }
3973 // Handle interruptible wait() ...
3974 ParkEvent * const ev = thread->_ParkEvent ;
3975 if (ev != NULL) ev->unpark() ;
3977 // When events are used everywhere for os::sleep, then this thr_kill
3978 // will only be needed if UseVMInterruptibleIO is true.
3980 if (!isInterrupted) {
3981 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
3982 assert_status(status == 0, status, "thr_kill");
3984 // Bump thread interruption counter
3985 RuntimeService::record_thread_interrupt_signaled_count();
3986 }
3987 }
3990 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3991 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3993 OSThread* osthread = thread->osthread();
3995 bool res = osthread->interrupted();
3997 // NOTE that since there is no "lock" around these two operations,
3998 // there is the possibility that the interrupted flag will be
3999 // "false" but that the interrupt event will be set. This is
4000 // intentional. The effect of this is that Object.wait() will appear
4001 // to have a spurious wakeup, which is not harmful, and the
4002 // possibility is so rare that it is not worth the added complexity
4003 // to add yet another lock. It has also been recommended not to put
4004 // the interrupted flag into the os::Solaris::Event structure,
4005 // because it hides the issue.
4006 if (res && clear_interrupted) {
4007 osthread->set_interrupted(false);
4008 }
4009 return res;
4010 }
4013 void os::print_statistics() {
4014 }
4016 int os::message_box(const char* title, const char* message) {
4017 int i;
4018 fdStream err(defaultStream::error_fd());
4019 for (i = 0; i < 78; i++) err.print_raw("=");
4020 err.cr();
4021 err.print_raw_cr(title);
4022 for (i = 0; i < 78; i++) err.print_raw("-");
4023 err.cr();
4024 err.print_raw_cr(message);
4025 for (i = 0; i < 78; i++) err.print_raw("=");
4026 err.cr();
4028 char buf[16];
4029 // Prevent process from exiting upon "read error" without consuming all CPU
4030 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4032 return buf[0] == 'y' || buf[0] == 'Y';
4033 }
4035 // A lightweight implementation that does not suspend the target thread and
4036 // thus returns only a hint. Used for profiling only!
4037 ExtendedPC os::get_thread_pc(Thread* thread) {
4038 // Make sure that it is called by the watcher and the Threads lock is owned.
4039 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4040 // For now, is only used to profile the VM Thread
4041 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4042 ExtendedPC epc;
4044 GetThreadPC_Callback cb(ProfileVM_lock);
4045 OSThread *osthread = thread->osthread();
4046 const int time_to_wait = 400; // 400ms wait for initial response
4047 int status = cb.interrupt(thread, time_to_wait);
4049 if (cb.is_done() ) {
4050 epc = cb.addr();
4051 } else {
4052 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4053 osthread->thread_id(), status););
4054 // epc is already NULL
4055 }
4056 return epc;
4057 }
4060 // This does not do anything on Solaris. This is basically a hook for being
4061 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4062 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4063 f(value, method, args, thread);
4064 }
4066 // This routine may be used by user applications as a "hook" to catch signals.
4067 // The user-defined signal handler must pass unrecognized signals to this
4068 // routine, and if it returns true (non-zero), then the signal handler must
4069 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4070 // routine will never retun false (zero), but instead will execute a VM panic
4071 // routine kill the process.
4072 //
4073 // If this routine returns false, it is OK to call it again. This allows
4074 // the user-defined signal handler to perform checks either before or after
4075 // the VM performs its own checks. Naturally, the user code would be making
4076 // a serious error if it tried to handle an exception (such as a null check
4077 // or breakpoint) that the VM was generating for its own correct operation.
4078 //
4079 // This routine may recognize any of the following kinds of signals:
4080 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4081 // os::Solaris::SIGasync
4082 // It should be consulted by handlers for any of those signals.
4083 // It explicitly does not recognize os::Solaris::SIGinterrupt
4084 //
4085 // The caller of this routine must pass in the three arguments supplied
4086 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4087 // field of the structure passed to sigaction(). This routine assumes that
4088 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4089 //
4090 // Note that the VM will print warnings if it detects conflicting signal
4091 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4092 //
4093 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
4096 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4097 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4098 }
4100 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4101 is needed to provoke threads blocked on IO to return an EINTR
4102 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4103 does NOT participate in signal chaining due to requirement for
4104 NOT setting SA_RESTART to make EINTR work. */
4105 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4106 if (UseSignalChaining) {
4107 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4108 if (actp && actp->sa_handler) {
4109 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4110 }
4111 }
4112 }
4114 // This boolean allows users to forward their own non-matching signals
4115 // to JVM_handle_solaris_signal, harmlessly.
4116 bool os::Solaris::signal_handlers_are_installed = false;
4118 // For signal-chaining
4119 bool os::Solaris::libjsig_is_loaded = false;
4120 typedef struct sigaction *(*get_signal_t)(int);
4121 get_signal_t os::Solaris::get_signal_action = NULL;
4123 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4124 struct sigaction *actp = NULL;
4126 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4127 // Retrieve the old signal handler from libjsig
4128 actp = (*get_signal_action)(sig);
4129 }
4130 if (actp == NULL) {
4131 // Retrieve the preinstalled signal handler from jvm
4132 actp = get_preinstalled_handler(sig);
4133 }
4135 return actp;
4136 }
4138 static bool call_chained_handler(struct sigaction *actp, int sig,
4139 siginfo_t *siginfo, void *context) {
4140 // Call the old signal handler
4141 if (actp->sa_handler == SIG_DFL) {
4142 // It's more reasonable to let jvm treat it as an unexpected exception
4143 // instead of taking the default action.
4144 return false;
4145 } else if (actp->sa_handler != SIG_IGN) {
4146 if ((actp->sa_flags & SA_NODEFER) == 0) {
4147 // automaticlly block the signal
4148 sigaddset(&(actp->sa_mask), sig);
4149 }
4151 sa_handler_t hand;
4152 sa_sigaction_t sa;
4153 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4154 // retrieve the chained handler
4155 if (siginfo_flag_set) {
4156 sa = actp->sa_sigaction;
4157 } else {
4158 hand = actp->sa_handler;
4159 }
4161 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4162 actp->sa_handler = SIG_DFL;
4163 }
4165 // try to honor the signal mask
4166 sigset_t oset;
4167 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4169 // call into the chained handler
4170 if (siginfo_flag_set) {
4171 (*sa)(sig, siginfo, context);
4172 } else {
4173 (*hand)(sig);
4174 }
4176 // restore the signal mask
4177 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4178 }
4179 // Tell jvm's signal handler the signal is taken care of.
4180 return true;
4181 }
4183 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4184 bool chained = false;
4185 // signal-chaining
4186 if (UseSignalChaining) {
4187 struct sigaction *actp = get_chained_signal_action(sig);
4188 if (actp != NULL) {
4189 chained = call_chained_handler(actp, sig, siginfo, context);
4190 }
4191 }
4192 return chained;
4193 }
4195 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4196 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4197 if (preinstalled_sigs[sig] != 0) {
4198 return &chainedsigactions[sig];
4199 }
4200 return NULL;
4201 }
4203 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4205 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4206 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4207 chainedsigactions[sig] = oldAct;
4208 preinstalled_sigs[sig] = 1;
4209 }
4211 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4212 // Check for overwrite.
4213 struct sigaction oldAct;
4214 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4215 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4216 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4217 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4218 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4219 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4220 if (AllowUserSignalHandlers || !set_installed) {
4221 // Do not overwrite; user takes responsibility to forward to us.
4222 return;
4223 } else if (UseSignalChaining) {
4224 if (oktochain) {
4225 // save the old handler in jvm
4226 save_preinstalled_handler(sig, oldAct);
4227 } else {
4228 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4229 }
4230 // libjsig also interposes the sigaction() call below and saves the
4231 // old sigaction on it own.
4232 } else {
4233 fatal2("Encountered unexpected pre-existing sigaction handler %#lx for signal %d.", (long)oldhand, sig);
4234 }
4235 }
4237 struct sigaction sigAct;
4238 sigfillset(&(sigAct.sa_mask));
4239 sigAct.sa_handler = SIG_DFL;
4241 sigAct.sa_sigaction = signalHandler;
4242 // Handle SIGSEGV on alternate signal stack if
4243 // not using stack banging
4244 if (!UseStackBanging && sig == SIGSEGV) {
4245 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4246 // Interruptible i/o requires SA_RESTART cleared so EINTR
4247 // is returned instead of restarting system calls
4248 } else if (sig == os::Solaris::SIGinterrupt()) {
4249 sigemptyset(&sigAct.sa_mask);
4250 sigAct.sa_handler = NULL;
4251 sigAct.sa_flags = SA_SIGINFO;
4252 sigAct.sa_sigaction = sigINTRHandler;
4253 } else {
4254 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4255 }
4256 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4258 sigaction(sig, &sigAct, &oldAct);
4260 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4261 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4262 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4263 }
4266 #define DO_SIGNAL_CHECK(sig) \
4267 if (!sigismember(&check_signal_done, sig)) \
4268 os::Solaris::check_signal_handler(sig)
4270 // This method is a periodic task to check for misbehaving JNI applications
4271 // under CheckJNI, we can add any periodic checks here
4273 void os::run_periodic_checks() {
4274 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4275 // thereby preventing a NULL checks.
4276 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4278 if (check_signals == false) return;
4280 // SEGV and BUS if overridden could potentially prevent
4281 // generation of hs*.log in the event of a crash, debugging
4282 // such a case can be very challenging, so we absolutely
4283 // check for the following for a good measure:
4284 DO_SIGNAL_CHECK(SIGSEGV);
4285 DO_SIGNAL_CHECK(SIGILL);
4286 DO_SIGNAL_CHECK(SIGFPE);
4287 DO_SIGNAL_CHECK(SIGBUS);
4288 DO_SIGNAL_CHECK(SIGPIPE);
4289 DO_SIGNAL_CHECK(SIGXFSZ);
4291 // ReduceSignalUsage allows the user to override these handlers
4292 // see comments at the very top and jvm_solaris.h
4293 if (!ReduceSignalUsage) {
4294 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4295 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4296 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4297 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4298 }
4300 // See comments above for using JVM1/JVM2 and UseAltSigs
4301 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4302 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4304 }
4306 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4308 static os_sigaction_t os_sigaction = NULL;
4310 void os::Solaris::check_signal_handler(int sig) {
4311 char buf[O_BUFLEN];
4312 address jvmHandler = NULL;
4314 struct sigaction act;
4315 if (os_sigaction == NULL) {
4316 // only trust the default sigaction, in case it has been interposed
4317 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4318 if (os_sigaction == NULL) return;
4319 }
4321 os_sigaction(sig, (struct sigaction*)NULL, &act);
4323 address thisHandler = (act.sa_flags & SA_SIGINFO)
4324 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4325 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4328 switch(sig) {
4329 case SIGSEGV:
4330 case SIGBUS:
4331 case SIGFPE:
4332 case SIGPIPE:
4333 case SIGXFSZ:
4334 case SIGILL:
4335 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4336 break;
4338 case SHUTDOWN1_SIGNAL:
4339 case SHUTDOWN2_SIGNAL:
4340 case SHUTDOWN3_SIGNAL:
4341 case BREAK_SIGNAL:
4342 jvmHandler = (address)user_handler();
4343 break;
4345 default:
4346 int intrsig = os::Solaris::SIGinterrupt();
4347 int asynsig = os::Solaris::SIGasync();
4349 if (sig == intrsig) {
4350 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4351 } else if (sig == asynsig) {
4352 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4353 } else {
4354 return;
4355 }
4356 break;
4357 }
4360 if (thisHandler != jvmHandler) {
4361 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4362 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4363 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4364 // No need to check this sig any longer
4365 sigaddset(&check_signal_done, sig);
4366 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4367 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4368 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4369 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4370 // No need to check this sig any longer
4371 sigaddset(&check_signal_done, sig);
4372 }
4374 // Print all the signal handler state
4375 if (sigismember(&check_signal_done, sig)) {
4376 print_signal_handlers(tty, buf, O_BUFLEN);
4377 }
4379 }
4381 void os::Solaris::install_signal_handlers() {
4382 bool libjsigdone = false;
4383 signal_handlers_are_installed = true;
4385 // signal-chaining
4386 typedef void (*signal_setting_t)();
4387 signal_setting_t begin_signal_setting = NULL;
4388 signal_setting_t end_signal_setting = NULL;
4389 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4390 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4391 if (begin_signal_setting != NULL) {
4392 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4393 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4394 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4395 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4396 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4397 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4398 libjsig_is_loaded = true;
4399 if (os::Solaris::get_libjsig_version != NULL) {
4400 libjsigversion = (*os::Solaris::get_libjsig_version)();
4401 }
4402 assert(UseSignalChaining, "should enable signal-chaining");
4403 }
4404 if (libjsig_is_loaded) {
4405 // Tell libjsig jvm is setting signal handlers
4406 (*begin_signal_setting)();
4407 }
4409 set_signal_handler(SIGSEGV, true, true);
4410 set_signal_handler(SIGPIPE, true, true);
4411 set_signal_handler(SIGXFSZ, true, true);
4412 set_signal_handler(SIGBUS, true, true);
4413 set_signal_handler(SIGILL, true, true);
4414 set_signal_handler(SIGFPE, true, true);
4417 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4419 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4420 // can not register overridable signals which might be > 32
4421 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4422 // Tell libjsig jvm has finished setting signal handlers
4423 (*end_signal_setting)();
4424 libjsigdone = true;
4425 }
4426 }
4428 // Never ok to chain our SIGinterrupt
4429 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4430 set_signal_handler(os::Solaris::SIGasync(), true, true);
4432 if (libjsig_is_loaded && !libjsigdone) {
4433 // Tell libjsig jvm finishes setting signal handlers
4434 (*end_signal_setting)();
4435 }
4437 // We don't activate signal checker if libjsig is in place, we trust ourselves
4438 // and if UserSignalHandler is installed all bets are off
4439 if (CheckJNICalls) {
4440 if (libjsig_is_loaded) {
4441 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4442 check_signals = false;
4443 }
4444 if (AllowUserSignalHandlers) {
4445 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4446 check_signals = false;
4447 }
4448 }
4449 }
4452 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4454 const char * signames[] = {
4455 "SIG0",
4456 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4457 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4458 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4459 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4460 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4461 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4462 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4463 "SIGCANCEL", "SIGLOST"
4464 };
4466 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4467 if (0 < exception_code && exception_code <= SIGRTMAX) {
4468 // signal
4469 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4470 jio_snprintf(buf, size, "%s", signames[exception_code]);
4471 } else {
4472 jio_snprintf(buf, size, "SIG%d", exception_code);
4473 }
4474 return buf;
4475 } else {
4476 return NULL;
4477 }
4478 }
4480 // (Static) wrappers for the new libthread API
4481 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4482 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4483 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4484 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4485 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4487 // (Static) wrapper for getisax(2) call.
4488 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4490 // (Static) wrappers for the liblgrp API
4491 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4492 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4493 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4494 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4495 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4496 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4497 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4498 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4499 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4501 // (Static) wrapper for meminfo() call.
4502 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4504 static address resolve_symbol_lazy(const char* name) {
4505 address addr = (address) dlsym(RTLD_DEFAULT, name);
4506 if(addr == NULL) {
4507 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4508 addr = (address) dlsym(RTLD_NEXT, name);
4509 }
4510 return addr;
4511 }
4513 static address resolve_symbol(const char* name) {
4514 address addr = resolve_symbol_lazy(name);
4515 if(addr == NULL) {
4516 fatal(dlerror());
4517 }
4518 return addr;
4519 }
4523 // isT2_libthread()
4524 //
4525 // Routine to determine if we are currently using the new T2 libthread.
4526 //
4527 // We determine if we are using T2 by reading /proc/self/lstatus and
4528 // looking for a thread with the ASLWP bit set. If we find this status
4529 // bit set, we must assume that we are NOT using T2. The T2 team
4530 // has approved this algorithm.
4531 //
4532 // We need to determine if we are running with the new T2 libthread
4533 // since setting native thread priorities is handled differently
4534 // when using this library. All threads created using T2 are bound
4535 // threads. Calling thr_setprio is meaningless in this case.
4536 //
4537 bool isT2_libthread() {
4538 static prheader_t * lwpArray = NULL;
4539 static int lwpSize = 0;
4540 static int lwpFile = -1;
4541 lwpstatus_t * that;
4542 char lwpName [128];
4543 bool isT2 = false;
4545 #define ADR(x) ((uintptr_t)(x))
4546 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4548 lwpFile = open("/proc/self/lstatus", O_RDONLY, 0);
4549 if (lwpFile < 0) {
4550 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4551 return false;
4552 }
4553 lwpSize = 16*1024;
4554 for (;;) {
4555 lseek (lwpFile, 0, SEEK_SET);
4556 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize);
4557 if (read(lwpFile, lwpArray, lwpSize) < 0) {
4558 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4559 break;
4560 }
4561 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4562 // We got a good snapshot - now iterate over the list.
4563 int aslwpcount = 0;
4564 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4565 that = LWPINDEX(lwpArray,i);
4566 if (that->pr_flags & PR_ASLWP) {
4567 aslwpcount++;
4568 }
4569 }
4570 if (aslwpcount == 0) isT2 = true;
4571 break;
4572 }
4573 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4574 FREE_C_HEAP_ARRAY(char, lwpArray); // retry.
4575 }
4577 FREE_C_HEAP_ARRAY(char, lwpArray);
4578 close (lwpFile);
4579 if (ThreadPriorityVerbose) {
4580 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4581 else tty->print_cr("We are not running with a T2 libthread\n");
4582 }
4583 return isT2;
4584 }
4587 void os::Solaris::libthread_init() {
4588 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4590 // Determine if we are running with the new T2 libthread
4591 os::Solaris::set_T2_libthread(isT2_libthread());
4593 lwp_priocntl_init();
4595 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4596 if(func == NULL) {
4597 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4598 // Guarantee that this VM is running on an new enough OS (5.6 or
4599 // later) that it will have a new enough libthread.so.
4600 guarantee(func != NULL, "libthread.so is too old.");
4601 }
4603 // Initialize the new libthread getstate API wrappers
4604 func = resolve_symbol("thr_getstate");
4605 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4607 func = resolve_symbol("thr_setstate");
4608 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4610 func = resolve_symbol("thr_setmutator");
4611 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4613 func = resolve_symbol("thr_suspend_mutator");
4614 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4616 func = resolve_symbol("thr_continue_mutator");
4617 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4619 int size;
4620 void (*handler_info_func)(address *, int *);
4621 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4622 handler_info_func(&handler_start, &size);
4623 handler_end = handler_start + size;
4624 }
4627 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4628 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4629 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4630 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4631 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4632 int os::Solaris::_mutex_scope = USYNC_THREAD;
4634 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4635 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4636 int_fnP_cond_tP os::Solaris::_cond_signal;
4637 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4638 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4639 int_fnP_cond_tP os::Solaris::_cond_destroy;
4640 int os::Solaris::_cond_scope = USYNC_THREAD;
4642 void os::Solaris::synchronization_init() {
4643 if(UseLWPSynchronization) {
4644 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4645 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4646 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4647 os::Solaris::set_mutex_init(lwp_mutex_init);
4648 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4649 os::Solaris::set_mutex_scope(USYNC_THREAD);
4651 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4652 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4653 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4654 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4655 os::Solaris::set_cond_init(lwp_cond_init);
4656 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4657 os::Solaris::set_cond_scope(USYNC_THREAD);
4658 }
4659 else {
4660 os::Solaris::set_mutex_scope(USYNC_THREAD);
4661 os::Solaris::set_cond_scope(USYNC_THREAD);
4663 if(UsePthreads) {
4664 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4665 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4666 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4667 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4668 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4670 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4671 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4672 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4673 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4674 os::Solaris::set_cond_init(pthread_cond_default_init);
4675 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4676 }
4677 else {
4678 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4679 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4680 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4681 os::Solaris::set_mutex_init(::mutex_init);
4682 os::Solaris::set_mutex_destroy(::mutex_destroy);
4684 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4685 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4686 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4687 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4688 os::Solaris::set_cond_init(::cond_init);
4689 os::Solaris::set_cond_destroy(::cond_destroy);
4690 }
4691 }
4692 }
4694 bool os::Solaris::liblgrp_init() {
4695 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4696 if (handle != NULL) {
4697 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4698 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4699 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4700 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4701 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4702 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4703 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4704 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4705 dlsym(handle, "lgrp_cookie_stale")));
4707 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4708 set_lgrp_cookie(c);
4709 return true;
4710 }
4711 return false;
4712 }
4714 void os::Solaris::misc_sym_init() {
4715 address func;
4717 // getisax
4718 func = resolve_symbol_lazy("getisax");
4719 if (func != NULL) {
4720 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4721 }
4723 // meminfo
4724 func = resolve_symbol_lazy("meminfo");
4725 if (func != NULL) {
4726 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4727 }
4728 }
4730 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4731 assert(_getisax != NULL, "_getisax not set");
4732 return _getisax(array, n);
4733 }
4735 // Symbol doesn't exist in Solaris 8 pset.h
4736 #ifndef PS_MYID
4737 #define PS_MYID -3
4738 #endif
4740 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4741 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4742 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4744 void init_pset_getloadavg_ptr(void) {
4745 pset_getloadavg_ptr =
4746 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4747 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4748 warning("pset_getloadavg function not found");
4749 }
4750 }
4752 int os::Solaris::_dev_zero_fd = -1;
4754 // this is called _before_ the global arguments have been parsed
4755 void os::init(void) {
4756 _initial_pid = getpid();
4758 max_hrtime = first_hrtime = gethrtime();
4760 init_random(1234567);
4762 page_size = sysconf(_SC_PAGESIZE);
4763 if (page_size == -1)
4764 fatal1("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno));
4765 init_page_sizes((size_t) page_size);
4767 Solaris::initialize_system_info();
4769 // Initialize misc. symbols as soon as possible, so we can use them
4770 // if we need them.
4771 Solaris::misc_sym_init();
4773 int fd = open("/dev/zero", O_RDWR);
4774 if (fd < 0) {
4775 fatal1("os::init: cannot open /dev/zero (%s)", strerror(errno));
4776 } else {
4777 Solaris::set_dev_zero_fd(fd);
4779 // Close on exec, child won't inherit.
4780 fcntl(fd, F_SETFD, FD_CLOEXEC);
4781 }
4783 clock_tics_per_sec = CLK_TCK;
4785 // check if dladdr1() exists; dladdr1 can provide more information than
4786 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4787 // and is available on linker patches for 5.7 and 5.8.
4788 // libdl.so must have been loaded, this call is just an entry lookup
4789 void * hdl = dlopen("libdl.so", RTLD_NOW);
4790 if (hdl)
4791 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4793 // (Solaris only) this switches to calls that actually do locking.
4794 ThreadCritical::initialize();
4796 main_thread = thr_self();
4798 // Constant minimum stack size allowed. It must be at least
4799 // the minimum of what the OS supports (thr_min_stack()), and
4800 // enough to allow the thread to get to user bytecode execution.
4801 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4802 // If the pagesize of the VM is greater than 8K determine the appropriate
4803 // number of initial guard pages. The user can change this with the
4804 // command line arguments, if needed.
4805 if (vm_page_size() > 8*K) {
4806 StackYellowPages = 1;
4807 StackRedPages = 1;
4808 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4809 }
4810 }
4812 // To install functions for atexit system call
4813 extern "C" {
4814 static void perfMemory_exit_helper() {
4815 perfMemory_exit();
4816 }
4817 }
4819 // this is called _after_ the global arguments have been parsed
4820 jint os::init_2(void) {
4821 // try to enable extended file IO ASAP, see 6431278
4822 os::Solaris::try_enable_extended_io();
4824 // Allocate a single page and mark it as readable for safepoint polling. Also
4825 // use this first mmap call to check support for MAP_ALIGN.
4826 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4827 page_size,
4828 MAP_PRIVATE | MAP_ALIGN,
4829 PROT_READ);
4830 if (polling_page == NULL) {
4831 has_map_align = false;
4832 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4833 PROT_READ);
4834 }
4836 os::set_polling_page(polling_page);
4838 #ifndef PRODUCT
4839 if( Verbose && PrintMiscellaneous )
4840 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4841 #endif
4843 if (!UseMembar) {
4844 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4845 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4846 os::set_memory_serialize_page( mem_serialize_page );
4848 #ifndef PRODUCT
4849 if(Verbose && PrintMiscellaneous)
4850 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4851 #endif
4852 }
4854 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
4856 // Check minimum allowable stack size for thread creation and to initialize
4857 // the java system classes, including StackOverflowError - depends on page
4858 // size. Add a page for compiler2 recursion in main thread.
4859 // Add in BytesPerWord times page size to account for VM stack during
4860 // class initialization depending on 32 or 64 bit VM.
4861 guarantee((Solaris::min_stack_allowed >=
4862 (StackYellowPages+StackRedPages+StackShadowPages+BytesPerWord
4863 COMPILER2_PRESENT(+1)) * page_size),
4864 "need to increase Solaris::min_stack_allowed on this platform");
4866 size_t threadStackSizeInBytes = ThreadStackSize * K;
4867 if (threadStackSizeInBytes != 0 &&
4868 threadStackSizeInBytes < Solaris::min_stack_allowed) {
4869 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4870 Solaris::min_stack_allowed/K);
4871 return JNI_ERR;
4872 }
4874 // For 64kbps there will be a 64kb page size, which makes
4875 // the usable default stack size quite a bit less. Increase the
4876 // stack for 64kb (or any > than 8kb) pages, this increases
4877 // virtual memory fragmentation (since we're not creating the
4878 // stack on a power of 2 boundary. The real fix for this
4879 // should be to fix the guard page mechanism.
4881 if (vm_page_size() > 8*K) {
4882 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4883 ? threadStackSizeInBytes +
4884 ((StackYellowPages + StackRedPages) * vm_page_size())
4885 : 0;
4886 ThreadStackSize = threadStackSizeInBytes/K;
4887 }
4889 // Make the stack size a multiple of the page size so that
4890 // the yellow/red zones can be guarded.
4891 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4892 vm_page_size()));
4894 Solaris::libthread_init();
4896 if (UseNUMA) {
4897 if (!Solaris::liblgrp_init()) {
4898 UseNUMA = false;
4899 } else {
4900 size_t lgrp_limit = os::numa_get_groups_num();
4901 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit);
4902 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4903 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4904 if (lgrp_num < 2) {
4905 // There's only one locality group, disable NUMA.
4906 UseNUMA = false;
4907 }
4908 }
4909 if (!UseNUMA && ForceNUMA) {
4910 UseNUMA = true;
4911 }
4912 }
4914 Solaris::signal_sets_init();
4915 Solaris::init_signal_mem();
4916 Solaris::install_signal_handlers();
4918 if (libjsigversion < JSIG_VERSION_1_4_1) {
4919 Maxlibjsigsigs = OLDMAXSIGNUM;
4920 }
4922 // initialize synchronization primitives to use either thread or
4923 // lwp synchronization (controlled by UseLWPSynchronization)
4924 Solaris::synchronization_init();
4926 if (MaxFDLimit) {
4927 // set the number of file descriptors to max. print out error
4928 // if getrlimit/setrlimit fails but continue regardless.
4929 struct rlimit nbr_files;
4930 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4931 if (status != 0) {
4932 if (PrintMiscellaneous && (Verbose || WizardMode))
4933 perror("os::init_2 getrlimit failed");
4934 } else {
4935 nbr_files.rlim_cur = nbr_files.rlim_max;
4936 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4937 if (status != 0) {
4938 if (PrintMiscellaneous && (Verbose || WizardMode))
4939 perror("os::init_2 setrlimit failed");
4940 }
4941 }
4942 }
4944 // Initialize HPI.
4945 jint hpi_result = hpi::initialize();
4946 if (hpi_result != JNI_OK) {
4947 tty->print_cr("There was an error trying to initialize the HPI library.");
4948 return hpi_result;
4949 }
4951 // Calculate theoretical max. size of Threads to guard gainst
4952 // artifical out-of-memory situations, where all available address-
4953 // space has been reserved by thread stacks. Default stack size is 1Mb.
4954 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4955 JavaThread::stack_size_at_create() : (1*K*K);
4956 assert(pre_thread_stack_size != 0, "Must have a stack");
4957 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4958 // we should start doing Virtual Memory banging. Currently when the threads will
4959 // have used all but 200Mb of space.
4960 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4961 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4963 // at-exit methods are called in the reverse order of their registration.
4964 // In Solaris 7 and earlier, atexit functions are called on return from
4965 // main or as a result of a call to exit(3C). There can be only 32 of
4966 // these functions registered and atexit() does not set errno. In Solaris
4967 // 8 and later, there is no limit to the number of functions registered
4968 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4969 // functions are called upon dlclose(3DL) in addition to return from main
4970 // and exit(3C).
4972 if (PerfAllowAtExitRegistration) {
4973 // only register atexit functions if PerfAllowAtExitRegistration is set.
4974 // atexit functions can be delayed until process exit time, which
4975 // can be problematic for embedded VM situations. Embedded VMs should
4976 // call DestroyJavaVM() to assure that VM resources are released.
4978 // note: perfMemory_exit_helper atexit function may be removed in
4979 // the future if the appropriate cleanup code can be added to the
4980 // VM_Exit VMOperation's doit method.
4981 if (atexit(perfMemory_exit_helper) != 0) {
4982 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4983 }
4984 }
4986 // Init pset_loadavg function pointer
4987 init_pset_getloadavg_ptr();
4989 return JNI_OK;
4990 }
4993 // Mark the polling page as unreadable
4994 void os::make_polling_page_unreadable(void) {
4995 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
4996 fatal("Could not disable polling page");
4997 };
4999 // Mark the polling page as readable
5000 void os::make_polling_page_readable(void) {
5001 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5002 fatal("Could not enable polling page");
5003 };
5005 // OS interface.
5007 int os::stat(const char *path, struct stat *sbuf) {
5008 char pathbuf[MAX_PATH];
5009 if (strlen(path) > MAX_PATH - 1) {
5010 errno = ENAMETOOLONG;
5011 return -1;
5012 }
5013 hpi::native_path(strcpy(pathbuf, path));
5014 return ::stat(pathbuf, sbuf);
5015 }
5018 bool os::check_heap(bool force) { return true; }
5020 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5021 static vsnprintf_t sol_vsnprintf = NULL;
5023 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5024 if (!sol_vsnprintf) {
5025 //search for the named symbol in the objects that were loaded after libjvm
5026 void* where = RTLD_NEXT;
5027 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5028 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5029 if (!sol_vsnprintf){
5030 //search for the named symbol in the objects that were loaded before libjvm
5031 where = RTLD_DEFAULT;
5032 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5033 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5034 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5035 }
5036 }
5037 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5038 }
5041 // Is a (classpath) directory empty?
5042 bool os::dir_is_empty(const char* path) {
5043 DIR *dir = NULL;
5044 struct dirent *ptr;
5046 dir = opendir(path);
5047 if (dir == NULL) return true;
5049 /* Scan the directory */
5050 bool result = true;
5051 char buf[sizeof(struct dirent) + MAX_PATH];
5052 struct dirent *dbuf = (struct dirent *) buf;
5053 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5054 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5055 result = false;
5056 }
5057 }
5058 closedir(dir);
5059 return result;
5060 }
5062 // create binary file, rewriting existing file if required
5063 int os::create_binary_file(const char* path, bool rewrite_existing) {
5064 int oflags = O_WRONLY | O_CREAT;
5065 if (!rewrite_existing) {
5066 oflags |= O_EXCL;
5067 }
5068 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5069 }
5071 // return current position of file pointer
5072 jlong os::current_file_offset(int fd) {
5073 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5074 }
5076 // move file pointer to the specified offset
5077 jlong os::seek_to_file_offset(int fd, jlong offset) {
5078 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5079 }
5081 // Map a block of memory.
5082 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
5083 char *addr, size_t bytes, bool read_only,
5084 bool allow_exec) {
5085 int prot;
5086 int flags;
5088 if (read_only) {
5089 prot = PROT_READ;
5090 flags = MAP_SHARED;
5091 } else {
5092 prot = PROT_READ | PROT_WRITE;
5093 flags = MAP_PRIVATE;
5094 }
5096 if (allow_exec) {
5097 prot |= PROT_EXEC;
5098 }
5100 if (addr != NULL) {
5101 flags |= MAP_FIXED;
5102 }
5104 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5105 fd, file_offset);
5106 if (mapped_address == MAP_FAILED) {
5107 return NULL;
5108 }
5109 return mapped_address;
5110 }
5113 // Remap a block of memory.
5114 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
5115 char *addr, size_t bytes, bool read_only,
5116 bool allow_exec) {
5117 // same as map_memory() on this OS
5118 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5119 allow_exec);
5120 }
5123 // Unmap a block of memory.
5124 bool os::unmap_memory(char* addr, size_t bytes) {
5125 return munmap(addr, bytes) == 0;
5126 }
5128 void os::pause() {
5129 char filename[MAX_PATH];
5130 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5131 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5132 } else {
5133 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5134 }
5136 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5137 if (fd != -1) {
5138 struct stat buf;
5139 close(fd);
5140 while (::stat(filename, &buf) == 0) {
5141 (void)::poll(NULL, 0, 100);
5142 }
5143 } else {
5144 jio_fprintf(stderr,
5145 "Could not open pause file '%s', continuing immediately.\n", filename);
5146 }
5147 }
5149 #ifndef PRODUCT
5150 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5151 // Turn this on if you need to trace synch operations.
5152 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5153 // and call record_synch_enable and record_synch_disable
5154 // around the computation of interest.
5156 void record_synch(char* name, bool returning); // defined below
5158 class RecordSynch {
5159 char* _name;
5160 public:
5161 RecordSynch(char* name) :_name(name)
5162 { record_synch(_name, false); }
5163 ~RecordSynch() { record_synch(_name, true); }
5164 };
5166 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5167 extern "C" ret name params { \
5168 typedef ret name##_t params; \
5169 static name##_t* implem = NULL; \
5170 static int callcount = 0; \
5171 if (implem == NULL) { \
5172 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5173 if (implem == NULL) fatal(dlerror()); \
5174 } \
5175 ++callcount; \
5176 RecordSynch _rs(#name); \
5177 inner; \
5178 return implem args; \
5179 }
5180 // in dbx, examine callcounts this way:
5181 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5183 #define CHECK_POINTER_OK(p) \
5184 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p)))
5185 #define CHECK_MU \
5186 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5187 #define CHECK_CV \
5188 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5189 #define CHECK_P(p) \
5190 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5192 #define CHECK_MUTEX(mutex_op) \
5193 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5195 CHECK_MUTEX( mutex_lock)
5196 CHECK_MUTEX( _mutex_lock)
5197 CHECK_MUTEX( mutex_unlock)
5198 CHECK_MUTEX(_mutex_unlock)
5199 CHECK_MUTEX( mutex_trylock)
5200 CHECK_MUTEX(_mutex_trylock)
5202 #define CHECK_COND(cond_op) \
5203 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5205 CHECK_COND( cond_wait);
5206 CHECK_COND(_cond_wait);
5207 CHECK_COND(_cond_wait_cancel);
5209 #define CHECK_COND2(cond_op) \
5210 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5212 CHECK_COND2( cond_timedwait);
5213 CHECK_COND2(_cond_timedwait);
5214 CHECK_COND2(_cond_timedwait_cancel);
5216 // do the _lwp_* versions too
5217 #define mutex_t lwp_mutex_t
5218 #define cond_t lwp_cond_t
5219 CHECK_MUTEX( _lwp_mutex_lock)
5220 CHECK_MUTEX( _lwp_mutex_unlock)
5221 CHECK_MUTEX( _lwp_mutex_trylock)
5222 CHECK_MUTEX( __lwp_mutex_lock)
5223 CHECK_MUTEX( __lwp_mutex_unlock)
5224 CHECK_MUTEX( __lwp_mutex_trylock)
5225 CHECK_MUTEX(___lwp_mutex_lock)
5226 CHECK_MUTEX(___lwp_mutex_unlock)
5228 CHECK_COND( _lwp_cond_wait);
5229 CHECK_COND( __lwp_cond_wait);
5230 CHECK_COND(___lwp_cond_wait);
5232 CHECK_COND2( _lwp_cond_timedwait);
5233 CHECK_COND2( __lwp_cond_timedwait);
5234 #undef mutex_t
5235 #undef cond_t
5237 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5238 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5239 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5240 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5241 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5242 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5243 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5244 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5247 // recording machinery:
5249 enum { RECORD_SYNCH_LIMIT = 200 };
5250 char* record_synch_name[RECORD_SYNCH_LIMIT];
5251 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5252 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5253 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5254 int record_synch_count = 0;
5255 bool record_synch_enabled = false;
5257 // in dbx, examine recorded data this way:
5258 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5260 void record_synch(char* name, bool returning) {
5261 if (record_synch_enabled) {
5262 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5263 record_synch_name[record_synch_count] = name;
5264 record_synch_returning[record_synch_count] = returning;
5265 record_synch_thread[record_synch_count] = thr_self();
5266 record_synch_arg0ptr[record_synch_count] = &name;
5267 record_synch_count++;
5268 }
5269 // put more checking code here:
5270 // ...
5271 }
5272 }
5274 void record_synch_enable() {
5275 // start collecting trace data, if not already doing so
5276 if (!record_synch_enabled) record_synch_count = 0;
5277 record_synch_enabled = true;
5278 }
5280 void record_synch_disable() {
5281 // stop collecting trace data
5282 record_synch_enabled = false;
5283 }
5285 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5286 #endif // PRODUCT
5288 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5289 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5290 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5293 // JVMTI & JVM monitoring and management support
5294 // The thread_cpu_time() and current_thread_cpu_time() are only
5295 // supported if is_thread_cpu_time_supported() returns true.
5296 // They are not supported on Solaris T1.
5298 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5299 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5300 // of a thread.
5301 //
5302 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5303 // returns the fast estimate available on the platform.
5305 // hrtime_t gethrvtime() return value includes
5306 // user time but does not include system time
5307 jlong os::current_thread_cpu_time() {
5308 return (jlong) gethrvtime();
5309 }
5311 jlong os::thread_cpu_time(Thread *thread) {
5312 // return user level CPU time only to be consistent with
5313 // what current_thread_cpu_time returns.
5314 // thread_cpu_time_info() must be changed if this changes
5315 return os::thread_cpu_time(thread, false /* user time only */);
5316 }
5318 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5319 if (user_sys_cpu_time) {
5320 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5321 } else {
5322 return os::current_thread_cpu_time();
5323 }
5324 }
5326 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5327 char proc_name[64];
5328 int count;
5329 prusage_t prusage;
5330 jlong lwp_time;
5331 int fd;
5333 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5334 getpid(),
5335 thread->osthread()->lwp_id());
5336 fd = open(proc_name, O_RDONLY);
5337 if ( fd == -1 ) return -1;
5339 do {
5340 count = pread(fd,
5341 (void *)&prusage.pr_utime,
5342 thr_time_size,
5343 thr_time_off);
5344 } while (count < 0 && errno == EINTR);
5345 close(fd);
5346 if ( count < 0 ) return -1;
5348 if (user_sys_cpu_time) {
5349 // user + system CPU time
5350 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5351 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5352 (jlong)prusage.pr_stime.tv_nsec +
5353 (jlong)prusage.pr_utime.tv_nsec;
5354 } else {
5355 // user level CPU time only
5356 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5357 (jlong)prusage.pr_utime.tv_nsec;
5358 }
5360 return(lwp_time);
5361 }
5363 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5364 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5365 info_ptr->may_skip_backward = false; // elapsed time not wall time
5366 info_ptr->may_skip_forward = false; // elapsed time not wall time
5367 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5368 }
5370 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5371 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5372 info_ptr->may_skip_backward = false; // elapsed time not wall time
5373 info_ptr->may_skip_forward = false; // elapsed time not wall time
5374 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5375 }
5377 bool os::is_thread_cpu_time_supported() {
5378 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5379 return true;
5380 } else {
5381 return false;
5382 }
5383 }
5385 // System loadavg support. Returns -1 if load average cannot be obtained.
5386 // Return the load average for our processor set if the primitive exists
5387 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5388 int os::loadavg(double loadavg[], int nelem) {
5389 if (pset_getloadavg_ptr != NULL) {
5390 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5391 } else {
5392 return ::getloadavg(loadavg, nelem);
5393 }
5394 }
5396 //---------------------------------------------------------------------------------
5397 #ifndef PRODUCT
5399 static address same_page(address x, address y) {
5400 intptr_t page_bits = -os::vm_page_size();
5401 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
5402 return x;
5403 else if (x > y)
5404 return (address)(intptr_t(y) | ~page_bits) + 1;
5405 else
5406 return (address)(intptr_t(y) & page_bits);
5407 }
5409 bool os::find(address addr) {
5410 Dl_info dlinfo;
5411 memset(&dlinfo, 0, sizeof(dlinfo));
5412 if (dladdr(addr, &dlinfo)) {
5413 #ifdef _LP64
5414 tty->print("0x%016lx: ", addr);
5415 #else
5416 tty->print("0x%08x: ", addr);
5417 #endif
5418 if (dlinfo.dli_sname != NULL)
5419 tty->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5420 else if (dlinfo.dli_fname)
5421 tty->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5422 else
5423 tty->print("<absolute address>");
5424 if (dlinfo.dli_fname) tty->print(" in %s", dlinfo.dli_fname);
5425 #ifdef _LP64
5426 if (dlinfo.dli_fbase) tty->print(" at 0x%016lx", dlinfo.dli_fbase);
5427 #else
5428 if (dlinfo.dli_fbase) tty->print(" at 0x%08x", dlinfo.dli_fbase);
5429 #endif
5430 tty->cr();
5432 if (Verbose) {
5433 // decode some bytes around the PC
5434 address begin = same_page(addr-40, addr);
5435 address end = same_page(addr+40, addr);
5436 address lowest = (address) dlinfo.dli_sname;
5437 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5438 if (begin < lowest) begin = lowest;
5439 Dl_info dlinfo2;
5440 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5441 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5442 end = (address) dlinfo2.dli_saddr;
5443 Disassembler::decode(begin, end);
5444 }
5445 return true;
5446 }
5447 return false;
5448 }
5450 #endif
5453 // Following function has been added to support HotSparc's libjvm.so running
5454 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5455 // src/solaris/hpi/native_threads in the EVM codebase.
5456 //
5457 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5458 // libraries and should thus be removed. We will leave it behind for a while
5459 // until we no longer want to able to run on top of 1.3.0 Solaris production
5460 // JDK. See 4341971.
5462 #define STACK_SLACK 0x800
5464 extern "C" {
5465 intptr_t sysThreadAvailableStackWithSlack() {
5466 stack_t st;
5467 intptr_t retval, stack_top;
5468 retval = thr_stksegment(&st);
5469 assert(retval == 0, "incorrect return value from thr_stksegment");
5470 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5471 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5472 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5473 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5474 }
5475 }
5477 // Just to get the Kernel build to link on solaris for testing.
5479 extern "C" {
5480 class ASGCT_CallTrace;
5481 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext)
5482 KERNEL_RETURN;
5483 }
5486 // ObjectMonitor park-unpark infrastructure ...
5487 //
5488 // We implement Solaris and Linux PlatformEvents with the
5489 // obvious condvar-mutex-flag triple.
5490 // Another alternative that works quite well is pipes:
5491 // Each PlatformEvent consists of a pipe-pair.
5492 // The thread associated with the PlatformEvent
5493 // calls park(), which reads from the input end of the pipe.
5494 // Unpark() writes into the other end of the pipe.
5495 // The write-side of the pipe must be set NDELAY.
5496 // Unfortunately pipes consume a large # of handles.
5497 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5498 // Using pipes for the 1st few threads might be workable, however.
5499 //
5500 // park() is permitted to return spuriously.
5501 // Callers of park() should wrap the call to park() in
5502 // an appropriate loop. A litmus test for the correct
5503 // usage of park is the following: if park() were modified
5504 // to immediately return 0 your code should still work,
5505 // albeit degenerating to a spin loop.
5506 //
5507 // An interesting optimization for park() is to use a trylock()
5508 // to attempt to acquire the mutex. If the trylock() fails
5509 // then we know that a concurrent unpark() operation is in-progress.
5510 // in that case the park() code could simply set _count to 0
5511 // and return immediately. The subsequent park() operation *might*
5512 // return immediately. That's harmless as the caller of park() is
5513 // expected to loop. By using trylock() we will have avoided a
5514 // avoided a context switch caused by contention on the per-thread mutex.
5515 //
5516 // TODO-FIXME:
5517 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5518 // objectmonitor implementation.
5519 // 2. Collapse the JSR166 parker event, and the
5520 // objectmonitor ParkEvent into a single "Event" construct.
5521 // 3. In park() and unpark() add:
5522 // assert (Thread::current() == AssociatedWith).
5523 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5524 // 1-out-of-N park() operations will return immediately.
5525 //
5526 // _Event transitions in park()
5527 // -1 => -1 : illegal
5528 // 1 => 0 : pass - return immediately
5529 // 0 => -1 : block
5530 //
5531 // _Event serves as a restricted-range semaphore.
5532 //
5533 // Another possible encoding of _Event would be with
5534 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5535 //
5536 // TODO-FIXME: add DTRACE probes for:
5537 // 1. Tx parks
5538 // 2. Ty unparks Tx
5539 // 3. Tx resumes from park
5542 // value determined through experimentation
5543 #define ROUNDINGFIX 11
5545 // utility to compute the abstime argument to timedwait.
5546 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5548 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5549 // millis is the relative timeout time
5550 // abstime will be the absolute timeout time
5551 if (millis < 0) millis = 0;
5552 struct timeval now;
5553 int status = gettimeofday(&now, NULL);
5554 assert(status == 0, "gettimeofday");
5555 jlong seconds = millis / 1000;
5556 jlong max_wait_period;
5558 if (UseLWPSynchronization) {
5559 // forward port of fix for 4275818 (not sleeping long enough)
5560 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5561 // _lwp_cond_timedwait() used a round_down algorithm rather
5562 // than a round_up. For millis less than our roundfactor
5563 // it rounded down to 0 which doesn't meet the spec.
5564 // For millis > roundfactor we may return a bit sooner, but
5565 // since we can not accurately identify the patch level and
5566 // this has already been fixed in Solaris 9 and 8 we will
5567 // leave it alone rather than always rounding down.
5569 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5570 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5571 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5572 max_wait_period = 21000000;
5573 } else {
5574 max_wait_period = 50000000;
5575 }
5576 millis %= 1000;
5577 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5578 seconds = max_wait_period;
5579 }
5580 abstime->tv_sec = now.tv_sec + seconds;
5581 long usec = now.tv_usec + millis * 1000;
5582 if (usec >= 1000000) {
5583 abstime->tv_sec += 1;
5584 usec -= 1000000;
5585 }
5586 abstime->tv_nsec = usec * 1000;
5587 return abstime;
5588 }
5590 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5591 // Conceptually TryPark() should be equivalent to park(0).
5593 int os::PlatformEvent::TryPark() {
5594 for (;;) {
5595 const int v = _Event ;
5596 guarantee ((v == 0) || (v == 1), "invariant") ;
5597 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5598 }
5599 }
5601 void os::PlatformEvent::park() { // AKA: down()
5602 // Invariant: Only the thread associated with the Event/PlatformEvent
5603 // may call park().
5604 int v ;
5605 for (;;) {
5606 v = _Event ;
5607 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5608 }
5609 guarantee (v >= 0, "invariant") ;
5610 if (v == 0) {
5611 // Do this the hard way by blocking ...
5612 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5613 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5614 // Only for SPARC >= V8PlusA
5615 #if defined(__sparc) && defined(COMPILER2)
5616 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5617 #endif
5618 int status = os::Solaris::mutex_lock(_mutex);
5619 assert_status(status == 0, status, "mutex_lock");
5620 guarantee (_nParked == 0, "invariant") ;
5621 ++ _nParked ;
5622 while (_Event < 0) {
5623 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5624 // Treat this the same as if the wait was interrupted
5625 // With usr/lib/lwp going to kernel, always handle ETIME
5626 status = os::Solaris::cond_wait(_cond, _mutex);
5627 if (status == ETIME) status = EINTR ;
5628 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5629 }
5630 -- _nParked ;
5631 _Event = 0 ;
5632 status = os::Solaris::mutex_unlock(_mutex);
5633 assert_status(status == 0, status, "mutex_unlock");
5634 }
5635 }
5637 int os::PlatformEvent::park(jlong millis) {
5638 guarantee (_nParked == 0, "invariant") ;
5639 int v ;
5640 for (;;) {
5641 v = _Event ;
5642 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5643 }
5644 guarantee (v >= 0, "invariant") ;
5645 if (v != 0) return OS_OK ;
5647 int ret = OS_TIMEOUT;
5648 timestruc_t abst;
5649 compute_abstime (&abst, millis);
5651 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5652 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5653 // Only for SPARC >= V8PlusA
5654 #if defined(__sparc) && defined(COMPILER2)
5655 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5656 #endif
5657 int status = os::Solaris::mutex_lock(_mutex);
5658 assert_status(status == 0, status, "mutex_lock");
5659 guarantee (_nParked == 0, "invariant") ;
5660 ++ _nParked ;
5661 while (_Event < 0) {
5662 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5663 assert_status(status == 0 || status == EINTR ||
5664 status == ETIME || status == ETIMEDOUT,
5665 status, "cond_timedwait");
5666 if (!FilterSpuriousWakeups) break ; // previous semantics
5667 if (status == ETIME || status == ETIMEDOUT) break ;
5668 // We consume and ignore EINTR and spurious wakeups.
5669 }
5670 -- _nParked ;
5671 if (_Event >= 0) ret = OS_OK ;
5672 _Event = 0 ;
5673 status = os::Solaris::mutex_unlock(_mutex);
5674 assert_status(status == 0, status, "mutex_unlock");
5675 return ret;
5676 }
5678 void os::PlatformEvent::unpark() {
5679 int v, AnyWaiters;
5681 // Increment _Event.
5682 // Another acceptable implementation would be to simply swap 1
5683 // into _Event:
5684 // if (Swap (&_Event, 1) < 0) {
5685 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ;
5686 // if (AnyWaiters) cond_signal (_cond) ;
5687 // }
5689 for (;;) {
5690 v = _Event ;
5691 if (v > 0) {
5692 // The LD of _Event could have reordered or be satisfied
5693 // by a read-aside from this processor's write buffer.
5694 // To avoid problems execute a barrier and then
5695 // ratify the value. A degenerate CAS() would also work.
5696 // Viz., CAS (v+0, &_Event, v) == v).
5697 OrderAccess::fence() ;
5698 if (_Event == v) return ;
5699 continue ;
5700 }
5701 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
5702 }
5704 // If the thread associated with the event was parked, wake it.
5705 if (v < 0) {
5706 int status ;
5707 // Wait for the thread assoc with the PlatformEvent to vacate.
5708 status = os::Solaris::mutex_lock(_mutex);
5709 assert_status(status == 0, status, "mutex_lock");
5710 AnyWaiters = _nParked ;
5711 status = os::Solaris::mutex_unlock(_mutex);
5712 assert_status(status == 0, status, "mutex_unlock");
5713 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
5714 if (AnyWaiters != 0) {
5715 // We intentional signal *after* dropping the lock
5716 // to avoid a common class of futile wakeups.
5717 status = os::Solaris::cond_signal(_cond);
5718 assert_status(status == 0, status, "cond_signal");
5719 }
5720 }
5721 }
5723 // JSR166
5724 // -------------------------------------------------------
5726 /*
5727 * The solaris and linux implementations of park/unpark are fairly
5728 * conservative for now, but can be improved. They currently use a
5729 * mutex/condvar pair, plus _counter.
5730 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5731 * sets count to 1 and signals condvar. Only one thread ever waits
5732 * on the condvar. Contention seen when trying to park implies that someone
5733 * is unparking you, so don't wait. And spurious returns are fine, so there
5734 * is no need to track notifications.
5735 */
5737 #define NANOSECS_PER_SEC 1000000000
5738 #define NANOSECS_PER_MILLISEC 1000000
5739 #define MAX_SECS 100000000
5741 /*
5742 * This code is common to linux and solaris and will be moved to a
5743 * common place in dolphin.
5744 *
5745 * The passed in time value is either a relative time in nanoseconds
5746 * or an absolute time in milliseconds. Either way it has to be unpacked
5747 * into suitable seconds and nanoseconds components and stored in the
5748 * given timespec structure.
5749 * Given time is a 64-bit value and the time_t used in the timespec is only
5750 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5751 * overflow if times way in the future are given. Further on Solaris versions
5752 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5753 * number of seconds, in abstime, is less than current_time + 100,000,000.
5754 * As it will be 28 years before "now + 100000000" will overflow we can
5755 * ignore overflow and just impose a hard-limit on seconds using the value
5756 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5757 * years from "now".
5758 */
5759 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5760 assert (time > 0, "convertTime");
5762 struct timeval now;
5763 int status = gettimeofday(&now, NULL);
5764 assert(status == 0, "gettimeofday");
5766 time_t max_secs = now.tv_sec + MAX_SECS;
5768 if (isAbsolute) {
5769 jlong secs = time / 1000;
5770 if (secs > max_secs) {
5771 absTime->tv_sec = max_secs;
5772 }
5773 else {
5774 absTime->tv_sec = secs;
5775 }
5776 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5777 }
5778 else {
5779 jlong secs = time / NANOSECS_PER_SEC;
5780 if (secs >= MAX_SECS) {
5781 absTime->tv_sec = max_secs;
5782 absTime->tv_nsec = 0;
5783 }
5784 else {
5785 absTime->tv_sec = now.tv_sec + secs;
5786 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5787 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5788 absTime->tv_nsec -= NANOSECS_PER_SEC;
5789 ++absTime->tv_sec; // note: this must be <= max_secs
5790 }
5791 }
5792 }
5793 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5794 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5795 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5796 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5797 }
5799 void Parker::park(bool isAbsolute, jlong time) {
5801 // Optional fast-path check:
5802 // Return immediately if a permit is available.
5803 if (_counter > 0) {
5804 _counter = 0 ;
5805 return ;
5806 }
5808 // Optional fast-exit: Check interrupt before trying to wait
5809 Thread* thread = Thread::current();
5810 assert(thread->is_Java_thread(), "Must be JavaThread");
5811 JavaThread *jt = (JavaThread *)thread;
5812 if (Thread::is_interrupted(thread, false)) {
5813 return;
5814 }
5816 // First, demultiplex/decode time arguments
5817 timespec absTime;
5818 if (time < 0) { // don't wait at all
5819 return;
5820 }
5821 if (time > 0) {
5822 // Warning: this code might be exposed to the old Solaris time
5823 // round-down bugs. Grep "roundingFix" for details.
5824 unpackTime(&absTime, isAbsolute, time);
5825 }
5827 // Enter safepoint region
5828 // Beware of deadlocks such as 6317397.
5829 // The per-thread Parker:: _mutex is a classic leaf-lock.
5830 // In particular a thread must never block on the Threads_lock while
5831 // holding the Parker:: mutex. If safepoints are pending both the
5832 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5833 ThreadBlockInVM tbivm(jt);
5835 // Don't wait if cannot get lock since interference arises from
5836 // unblocking. Also. check interrupt before trying wait
5837 if (Thread::is_interrupted(thread, false) ||
5838 os::Solaris::mutex_trylock(_mutex) != 0) {
5839 return;
5840 }
5842 int status ;
5844 if (_counter > 0) { // no wait needed
5845 _counter = 0;
5846 status = os::Solaris::mutex_unlock(_mutex);
5847 assert (status == 0, "invariant") ;
5848 return;
5849 }
5851 #ifdef ASSERT
5852 // Don't catch signals while blocked; let the running threads have the signals.
5853 // (This allows a debugger to break into the running thread.)
5854 sigset_t oldsigs;
5855 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5856 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5857 #endif
5859 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5860 jt->set_suspend_equivalent();
5861 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5863 // Do this the hard way by blocking ...
5864 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5865 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5866 // Only for SPARC >= V8PlusA
5867 #if defined(__sparc) && defined(COMPILER2)
5868 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5869 #endif
5871 if (time == 0) {
5872 status = os::Solaris::cond_wait (_cond, _mutex) ;
5873 } else {
5874 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5875 }
5876 // Note that an untimed cond_wait() can sometimes return ETIME on older
5877 // versions of the Solaris.
5878 assert_status(status == 0 || status == EINTR ||
5879 status == ETIME || status == ETIMEDOUT,
5880 status, "cond_timedwait");
5882 #ifdef ASSERT
5883 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
5884 #endif
5885 _counter = 0 ;
5886 status = os::Solaris::mutex_unlock(_mutex);
5887 assert_status(status == 0, status, "mutex_unlock") ;
5889 // If externally suspended while waiting, re-suspend
5890 if (jt->handle_special_suspend_equivalent_condition()) {
5891 jt->java_suspend_self();
5892 }
5894 }
5896 void Parker::unpark() {
5897 int s, status ;
5898 status = os::Solaris::mutex_lock (_mutex) ;
5899 assert (status == 0, "invariant") ;
5900 s = _counter;
5901 _counter = 1;
5902 status = os::Solaris::mutex_unlock (_mutex) ;
5903 assert (status == 0, "invariant") ;
5905 if (s < 1) {
5906 status = os::Solaris::cond_signal (_cond) ;
5907 assert (status == 0, "invariant") ;
5908 }
5909 }
5911 extern char** environ;
5913 // Run the specified command in a separate process. Return its exit value,
5914 // or -1 on failure (e.g. can't fork a new process).
5915 // Unlike system(), this function can be called from signal handler. It
5916 // doesn't block SIGINT et al.
5917 int os::fork_and_exec(char* cmd) {
5918 char * argv[4];
5919 argv[0] = (char *)"sh";
5920 argv[1] = (char *)"-c";
5921 argv[2] = cmd;
5922 argv[3] = NULL;
5924 // fork is async-safe, fork1 is not so can't use in signal handler
5925 pid_t pid;
5926 Thread* t = ThreadLocalStorage::get_thread_slow();
5927 if (t != NULL && t->is_inside_signal_handler()) {
5928 pid = fork();
5929 } else {
5930 pid = fork1();
5931 }
5933 if (pid < 0) {
5934 // fork failed
5935 warning("fork failed: %s", strerror(errno));
5936 return -1;
5938 } else if (pid == 0) {
5939 // child process
5941 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5942 execve("/usr/bin/sh", argv, environ);
5944 // execve failed
5945 _exit(-1);
5947 } else {
5948 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5949 // care about the actual exit code, for now.
5951 int status;
5953 // Wait for the child process to exit. This returns immediately if
5954 // the child has already exited. */
5955 while (waitpid(pid, &status, 0) < 0) {
5956 switch (errno) {
5957 case ECHILD: return 0;
5958 case EINTR: break;
5959 default: return -1;
5960 }
5961 }
5963 if (WIFEXITED(status)) {
5964 // The child exited normally; get its exit code.
5965 return WEXITSTATUS(status);
5966 } else if (WIFSIGNALED(status)) {
5967 // The child exited because of a signal
5968 // The best value to return is 0x80 + signal number,
5969 // because that is what all Unix shells do, and because
5970 // it allows callers to distinguish between process exit and
5971 // process death by signal.
5972 return 0x80 + WTERMSIG(status);
5973 } else {
5974 // Unknown exit code; pass it through
5975 return status;
5976 }
5977 }
5978 }