1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_solaris.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_solaris.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "prims/jniFastGetField.hpp"
41 #include "prims/jvm.h"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/osThread.hpp"
52 #include "runtime/perfMemory.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/statSampler.hpp"
55 #include "runtime/stubRoutines.hpp"
56 #include "runtime/thread.inline.hpp"
57 #include "runtime/threadCritical.hpp"
58 #include "runtime/timer.hpp"
59 #include "services/attachListener.hpp"
60 #include "services/memTracker.hpp"
61 #include "services/runtimeService.hpp"
62 #include "utilities/decoder.hpp"
63 #include "utilities/defaultStream.hpp"
64 #include "utilities/events.hpp"
65 #include "utilities/growableArray.hpp"
66 #include "utilities/vmError.hpp"
67
68 // put OS-includes here
69 # include <dlfcn.h>
70 # include <errno.h>
71 # include <exception>
72 # include <link.h>
73 # include <poll.h>
74 # include <pthread.h>
75 # include <pwd.h>
76 # include <schedctl.h>
77 # include <setjmp.h>
78 # include <signal.h>
79 # include <stdio.h>
80 # include <alloca.h>
81 # include <sys/filio.h>
82 # include <sys/ipc.h>
83 # include <sys/lwp.h>
84 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
85 # include <sys/mman.h>
86 # include <sys/processor.h>
87 # include <sys/procset.h>
88 # include <sys/pset.h>
89 # include <sys/resource.h>
90 # include <sys/shm.h>
91 # include <sys/socket.h>
92 # include <sys/stat.h>
93 # include <sys/systeminfo.h>
94 # include <sys/time.h>
95 # include <sys/times.h>
96 # include <sys/types.h>
97 # include <sys/wait.h>
98 # include <sys/utsname.h>
99 # include <thread.h>
100 # include <unistd.h>
101 # include <sys/priocntl.h>
102 # include <sys/rtpriocntl.h>
103 # include <sys/tspriocntl.h>
104 # include <sys/iapriocntl.h>
105 # include <sys/fxpriocntl.h>
106 # include <sys/loadavg.h>
107 # include <string.h>
108 # include <stdio.h>
109
110 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
111 # include <sys/procfs.h> // see comment in <sys/procfs.h>
112
113 #define MAX_PATH (2 * K)
114
115 // for timer info max values which include all bits
116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
117
118 #ifdef _GNU_SOURCE
119 // See bug #6514594
120 extern "C" int madvise(caddr_t, size_t, int);
121 extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg,
122 int attr, int mask);
123 #endif //_GNU_SOURCE
124
125 /*
126 MPSS Changes Start.
127 The JVM binary needs to be built and run on pre-Solaris 9
128 systems, but the constants needed by MPSS are only in Solaris 9
129 header files. They are textually replicated here to allow
130 building on earlier systems. Once building on Solaris 8 is
131 no longer a requirement, these #defines can be replaced by ordinary
132 system .h inclusion.
133
134 In earlier versions of the JDK and Solaris, we used ISM for large pages.
135 But ISM requires shared memory to achieve this and thus has many caveats.
136 MPSS is a fully transparent and is a cleaner way to get large pages.
137 Although we still require keeping ISM for backward compatiblitiy as well as
138 giving the opportunity to use large pages on older systems it is
139 recommended that MPSS be used for Solaris 9 and above.
140
141 */
142
143 #ifndef MC_HAT_ADVISE
144
145 struct memcntl_mha {
146 uint_t mha_cmd; /* command(s) */
147 uint_t mha_flags;
148 size_t mha_pagesize;
149 };
150 #define MC_HAT_ADVISE 7 /* advise hat map size */
151 #define MHA_MAPSIZE_VA 0x1 /* set preferred page size */
152 #define MAP_ALIGN 0x200 /* addr specifies alignment */
153
154 #endif
155 // MPSS Changes End.
156
157
158 // Here are some liblgrp types from sys/lgrp_user.h to be able to
159 // compile on older systems without this header file.
160
161 #ifndef MADV_ACCESS_LWP
162 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
163 #endif
164 #ifndef MADV_ACCESS_MANY
165 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
166 #endif
167
168 #ifndef LGRP_RSRC_CPU
169 # define LGRP_RSRC_CPU 0 /* CPU resources */
170 #endif
171 #ifndef LGRP_RSRC_MEM
172 # define LGRP_RSRC_MEM 1 /* memory resources */
173 #endif
174
175 // Some more macros from sys/mman.h that are not present in Solaris 8.
176
177 #ifndef MAX_MEMINFO_CNT
178 /*
179 * info_req request type definitions for meminfo
180 * request types starting with MEMINFO_V are used for Virtual addresses
181 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical
182 * addresses
183 */
184 # define MEMINFO_SHIFT 16
185 # define MEMINFO_MASK (0xFF << MEMINFO_SHIFT)
186 # define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */
187 # define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */
188 # define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */
189 # define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */
190 # define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */
191 # define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */
192 # define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */
193
194 /* maximum number of addresses meminfo() can process at a time */
195 # define MAX_MEMINFO_CNT 256
196
197 /* maximum number of request types */
198 # define MAX_MEMINFO_REQ 31
199 #endif
200
201 // see thr_setprio(3T) for the basis of these numbers
202 #define MinimumPriority 0
203 #define NormalPriority 64
204 #define MaximumPriority 127
205
206 // Values for ThreadPriorityPolicy == 1
207 int prio_policy1[CriticalPriority+1] = {
208 -99999, 0, 16, 32, 48, 64,
209 80, 96, 112, 124, 127, 127 };
210
211 // System parameters used internally
212 static clock_t clock_tics_per_sec = 100;
213
214 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
215 static bool enabled_extended_FILE_stdio = false;
216
217 // For diagnostics to print a message once. see run_periodic_checks
218 static bool check_addr0_done = false;
219 static sigset_t check_signal_done;
220 static bool check_signals = true;
221
222 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
223 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
224
225 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
226
227
228 // "default" initializers for missing libc APIs
229 extern "C" {
230 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
231 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
232
233 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
234 static int lwp_cond_destroy(cond_t *cv) { return 0; }
235 }
236
237 // "default" initializers for pthread-based synchronization
238 extern "C" {
239 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
240 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
241 }
242
243 // Thread Local Storage
244 // This is common to all Solaris platforms so it is defined here,
245 // in this common file.
246 // The declarations are in the os_cpu threadLS*.hpp files.
247 //
248 // Static member initialization for TLS
249 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
250
251 #ifndef PRODUCT
252 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
253
254 int ThreadLocalStorage::_tcacheHit = 0;
255 int ThreadLocalStorage::_tcacheMiss = 0;
256
257 void ThreadLocalStorage::print_statistics() {
258 int total = _tcacheMiss+_tcacheHit;
259 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
260 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
261 }
262 #undef _PCT
263 #endif // PRODUCT
264
265 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
266 int index) {
267 Thread *thread = get_thread_slow();
268 if (thread != NULL) {
269 address sp = os::current_stack_pointer();
270 guarantee(thread->_stack_base == NULL ||
271 (sp <= thread->_stack_base &&
272 sp >= thread->_stack_base - thread->_stack_size) ||
273 is_error_reported(),
274 "sp must be inside of selected thread stack");
275
276 thread->set_self_raw_id(raw_id); // mark for quick retrieval
277 _get_thread_cache[ index ] = thread;
278 }
279 return thread;
280 }
281
282
283 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
284 #define NO_CACHED_THREAD ((Thread*)all_zero)
285
286 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
287
288 // Store the new value before updating the cache to prevent a race
289 // between get_thread_via_cache_slowly() and this store operation.
290 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
291
292 // Update thread cache with new thread if setting on thread create,
293 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
294 uintptr_t raw = pd_raw_thread_id();
295 int ix = pd_cache_index(raw);
296 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
297 }
298
299 void ThreadLocalStorage::pd_init() {
300 for (int i = 0; i < _pd_cache_size; i++) {
301 _get_thread_cache[i] = NO_CACHED_THREAD;
302 }
303 }
304
305 // Invalidate all the caches (happens to be the same as pd_init).
306 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
307
308 #undef NO_CACHED_THREAD
309
310 // END Thread Local Storage
311
312 static inline size_t adjust_stack_size(address base, size_t size) {
313 if ((ssize_t)size < 0) {
314 // 4759953: Compensate for ridiculous stack size.
315 size = max_intx;
316 }
317 if (size > (size_t)base) {
318 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
319 size = (size_t)base;
320 }
321 return size;
322 }
323
324 static inline stack_t get_stack_info() {
325 stack_t st;
326 int retval = thr_stksegment(&st);
327 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
328 assert(retval == 0, "incorrect return value from thr_stksegment");
329 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
330 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
331 return st;
332 }
333
334 address os::current_stack_base() {
335 int r = thr_main() ;
336 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
337 bool is_primordial_thread = r;
338
339 // Workaround 4352906, avoid calls to thr_stksegment by
340 // thr_main after the first one (it looks like we trash
341 // some data, causing the value for ss_sp to be incorrect).
342 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
343 stack_t st = get_stack_info();
344 if (is_primordial_thread) {
345 // cache initial value of stack base
346 os::Solaris::_main_stack_base = (address)st.ss_sp;
347 }
348 return (address)st.ss_sp;
349 } else {
350 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
351 return os::Solaris::_main_stack_base;
352 }
353 }
354
355 size_t os::current_stack_size() {
356 size_t size;
357
358 int r = thr_main() ;
359 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
360 if(!r) {
361 size = get_stack_info().ss_size;
362 } else {
363 struct rlimit limits;
364 getrlimit(RLIMIT_STACK, &limits);
365 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
366 }
367 // base may not be page aligned
368 address base = current_stack_base();
369 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
370 return (size_t)(base - bottom);
371 }
372
373 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
374 return localtime_r(clock, res);
375 }
376
377 // interruptible infrastructure
378
379 // setup_interruptible saves the thread state before going into an
380 // interruptible system call.
381 // The saved state is used to restore the thread to
382 // its former state whether or not an interrupt is received.
383 // Used by classloader os::read
384 // os::restartable_read calls skip this layer and stay in _thread_in_native
385
386 void os::Solaris::setup_interruptible(JavaThread* thread) {
387
388 JavaThreadState thread_state = thread->thread_state();
389
390 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
391 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
392 OSThread* osthread = thread->osthread();
393 osthread->set_saved_interrupt_thread_state(thread_state);
394 thread->frame_anchor()->make_walkable(thread);
395 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
396 }
397
398 // Version of setup_interruptible() for threads that are already in
399 // _thread_blocked. Used by os_sleep().
400 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
401 thread->frame_anchor()->make_walkable(thread);
402 }
403
404 JavaThread* os::Solaris::setup_interruptible() {
405 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
406 setup_interruptible(thread);
407 return thread;
408 }
409
410 void os::Solaris::try_enable_extended_io() {
411 typedef int (*enable_extended_FILE_stdio_t)(int, int);
412
413 if (!UseExtendedFileIO) {
414 return;
415 }
416
417 enable_extended_FILE_stdio_t enabler =
418 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
419 "enable_extended_FILE_stdio");
420 if (enabler) {
421 enabler(-1, -1);
422 }
423 }
424
425
426 #ifdef ASSERT
427
428 JavaThread* os::Solaris::setup_interruptible_native() {
429 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
430 JavaThreadState thread_state = thread->thread_state();
431 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
432 return thread;
433 }
434
435 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
436 JavaThreadState thread_state = thread->thread_state();
437 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
438 }
439 #endif
440
441 // cleanup_interruptible reverses the effects of setup_interruptible
442 // setup_interruptible_already_blocked() does not need any cleanup.
443
444 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
445 OSThread* osthread = thread->osthread();
446
447 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
448 }
449
450 // I/O interruption related counters called in _INTERRUPTIBLE
451
452 void os::Solaris::bump_interrupted_before_count() {
453 RuntimeService::record_interrupted_before_count();
454 }
455
456 void os::Solaris::bump_interrupted_during_count() {
457 RuntimeService::record_interrupted_during_count();
458 }
459
460 static int _processors_online = 0;
461
462 jint os::Solaris::_os_thread_limit = 0;
463 volatile jint os::Solaris::_os_thread_count = 0;
464
465 julong os::available_memory() {
466 return Solaris::available_memory();
467 }
468
469 julong os::Solaris::available_memory() {
470 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
471 }
472
473 julong os::Solaris::_physical_memory = 0;
474
475 julong os::physical_memory() {
476 return Solaris::physical_memory();
477 }
478
479 julong os::allocatable_physical_memory(julong size) {
480 #ifdef _LP64
481 return size;
482 #else
483 julong result = MIN2(size, (julong)3835*M);
484 if (!is_allocatable(result)) {
485 // Memory allocations will be aligned but the alignment
486 // is not known at this point. Alignments will
487 // be at most to LargePageSizeInBytes. Protect
488 // allocations from alignments up to illegal
489 // values. If at this point 2G is illegal.
490 julong reasonable_size = (julong)2*G - 2 * LargePageSizeInBytes;
491 result = MIN2(size, reasonable_size);
492 }
493 return result;
494 #endif
495 }
496
497 static hrtime_t first_hrtime = 0;
498 static const hrtime_t hrtime_hz = 1000*1000*1000;
499 const int LOCK_BUSY = 1;
500 const int LOCK_FREE = 0;
501 const int LOCK_INVALID = -1;
502 static volatile hrtime_t max_hrtime = 0;
503 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress
504
505
506 void os::Solaris::initialize_system_info() {
507 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
508 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
509 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
510 }
511
512 int os::active_processor_count() {
513 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
514 pid_t pid = getpid();
515 psetid_t pset = PS_NONE;
516 // Are we running in a processor set or is there any processor set around?
517 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
518 uint_t pset_cpus;
519 // Query the number of cpus available to us.
520 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
521 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
522 _processors_online = pset_cpus;
523 return pset_cpus;
524 }
525 }
526 // Otherwise return number of online cpus
527 return online_cpus;
528 }
529
530 static bool find_processors_in_pset(psetid_t pset,
531 processorid_t** id_array,
532 uint_t* id_length) {
533 bool result = false;
534 // Find the number of processors in the processor set.
535 if (pset_info(pset, NULL, id_length, NULL) == 0) {
536 // Make up an array to hold their ids.
537 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
538 // Fill in the array with their processor ids.
539 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
540 result = true;
541 }
542 }
543 return result;
544 }
545
546 // Callers of find_processors_online() must tolerate imprecise results --
547 // the system configuration can change asynchronously because of DR
548 // or explicit psradm operations.
549 //
550 // We also need to take care that the loop (below) terminates as the
551 // number of processors online can change between the _SC_NPROCESSORS_ONLN
552 // request and the loop that builds the list of processor ids. Unfortunately
553 // there's no reliable way to determine the maximum valid processor id,
554 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
555 // man pages, which claim the processor id set is "sparse, but
556 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
557 // exit the loop.
558 //
559 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
560 // not available on S8.0.
561
562 static bool find_processors_online(processorid_t** id_array,
563 uint* id_length) {
564 const processorid_t MAX_PROCESSOR_ID = 100000 ;
565 // Find the number of processors online.
566 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
567 // Make up an array to hold their ids.
568 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
569 // Processors need not be numbered consecutively.
570 long found = 0;
571 processorid_t next = 0;
572 while (found < *id_length && next < MAX_PROCESSOR_ID) {
573 processor_info_t info;
574 if (processor_info(next, &info) == 0) {
575 // NB, PI_NOINTR processors are effectively online ...
576 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
577 (*id_array)[found] = next;
578 found += 1;
579 }
580 }
581 next += 1;
582 }
583 if (found < *id_length) {
584 // The loop above didn't identify the expected number of processors.
585 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
586 // and re-running the loop, above, but there's no guarantee of progress
587 // if the system configuration is in flux. Instead, we just return what
588 // we've got. Note that in the worst case find_processors_online() could
589 // return an empty set. (As a fall-back in the case of the empty set we
590 // could just return the ID of the current processor).
591 *id_length = found ;
592 }
593
594 return true;
595 }
596
597 static bool assign_distribution(processorid_t* id_array,
598 uint id_length,
599 uint* distribution,
600 uint distribution_length) {
601 // We assume we can assign processorid_t's to uint's.
602 assert(sizeof(processorid_t) == sizeof(uint),
603 "can't convert processorid_t to uint");
604 // Quick check to see if we won't succeed.
605 if (id_length < distribution_length) {
606 return false;
607 }
608 // Assign processor ids to the distribution.
609 // Try to shuffle processors to distribute work across boards,
610 // assuming 4 processors per board.
611 const uint processors_per_board = ProcessDistributionStride;
612 // Find the maximum processor id.
613 processorid_t max_id = 0;
614 for (uint m = 0; m < id_length; m += 1) {
615 max_id = MAX2(max_id, id_array[m]);
616 }
617 // The next id, to limit loops.
618 const processorid_t limit_id = max_id + 1;
619 // Make up markers for available processors.
620 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
621 for (uint c = 0; c < limit_id; c += 1) {
622 available_id[c] = false;
623 }
624 for (uint a = 0; a < id_length; a += 1) {
625 available_id[id_array[a]] = true;
626 }
627 // Step by "boards", then by "slot", copying to "assigned".
628 // NEEDS_CLEANUP: The assignment of processors should be stateful,
629 // remembering which processors have been assigned by
630 // previous calls, etc., so as to distribute several
631 // independent calls of this method. What we'd like is
632 // It would be nice to have an API that let us ask
633 // how many processes are bound to a processor,
634 // but we don't have that, either.
635 // In the short term, "board" is static so that
636 // subsequent distributions don't all start at board 0.
637 static uint board = 0;
638 uint assigned = 0;
639 // Until we've found enough processors ....
640 while (assigned < distribution_length) {
641 // ... find the next available processor in the board.
642 for (uint slot = 0; slot < processors_per_board; slot += 1) {
643 uint try_id = board * processors_per_board + slot;
644 if ((try_id < limit_id) && (available_id[try_id] == true)) {
645 distribution[assigned] = try_id;
646 available_id[try_id] = false;
647 assigned += 1;
648 break;
649 }
650 }
651 board += 1;
652 if (board * processors_per_board + 0 >= limit_id) {
653 board = 0;
654 }
655 }
656 if (available_id != NULL) {
657 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
658 }
659 return true;
660 }
661
662 void os::set_native_thread_name(const char *name) {
663 // Not yet implemented.
664 return;
665 }
666
667 bool os::distribute_processes(uint length, uint* distribution) {
668 bool result = false;
669 // Find the processor id's of all the available CPUs.
670 processorid_t* id_array = NULL;
671 uint id_length = 0;
672 // There are some races between querying information and using it,
673 // since processor sets can change dynamically.
674 psetid_t pset = PS_NONE;
675 // Are we running in a processor set?
676 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
677 result = find_processors_in_pset(pset, &id_array, &id_length);
678 } else {
679 result = find_processors_online(&id_array, &id_length);
680 }
681 if (result == true) {
682 if (id_length >= length) {
683 result = assign_distribution(id_array, id_length, distribution, length);
684 } else {
685 result = false;
686 }
687 }
688 if (id_array != NULL) {
689 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
690 }
691 return result;
692 }
693
694 bool os::bind_to_processor(uint processor_id) {
695 // We assume that a processorid_t can be stored in a uint.
696 assert(sizeof(uint) == sizeof(processorid_t),
697 "can't convert uint to processorid_t");
698 int bind_result =
699 processor_bind(P_LWPID, // bind LWP.
700 P_MYID, // bind current LWP.
701 (processorid_t) processor_id, // id.
702 NULL); // don't return old binding.
703 return (bind_result == 0);
704 }
705
706 bool os::getenv(const char* name, char* buffer, int len) {
707 char* val = ::getenv( name );
708 if ( val == NULL
709 || strlen(val) + 1 > len ) {
710 if (len > 0) buffer[0] = 0; // return a null string
711 return false;
712 }
713 strcpy( buffer, val );
714 return true;
715 }
716
717
718 // Return true if user is running as root.
719
720 bool os::have_special_privileges() {
721 static bool init = false;
722 static bool privileges = false;
723 if (!init) {
724 privileges = (getuid() != geteuid()) || (getgid() != getegid());
725 init = true;
726 }
727 return privileges;
728 }
729
730
731 void os::init_system_properties_values() {
732 char arch[12];
733 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
734
735 // The next steps are taken in the product version:
736 //
737 // Obtain the JAVA_HOME value from the location of libjvm.so.
738 // This library should be located at:
739 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
740 //
741 // If "/jre/lib/" appears at the right place in the path, then we
742 // assume libjvm.so is installed in a JDK and we use this path.
743 //
744 // Otherwise exit with message: "Could not create the Java virtual machine."
745 //
746 // The following extra steps are taken in the debugging version:
747 //
748 // If "/jre/lib/" does NOT appear at the right place in the path
749 // instead of exit check for $JAVA_HOME environment variable.
750 //
751 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
752 // then we append a fake suffix "hotspot/libjvm.so" to this path so
753 // it looks like libjvm.so is installed there
754 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
755 //
756 // Otherwise exit.
757 //
758 // Important note: if the location of libjvm.so changes this
759 // code needs to be changed accordingly.
760
761 // The next few definitions allow the code to be verbatim:
762 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
763 #define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal)
764 #define getenv(n) ::getenv(n)
765
766 #define EXTENSIONS_DIR "/lib/ext"
767 #define ENDORSED_DIR "/lib/endorsed"
768 #define COMMON_DIR "/usr/jdk/packages"
769
770 {
771 /* sysclasspath, java_home, dll_dir */
772 {
773 char *home_path;
774 char *dll_path;
775 char *pslash;
776 char buf[MAXPATHLEN];
777 os::jvm_path(buf, sizeof(buf));
778
779 // Found the full path to libjvm.so.
780 // Now cut the path to <java_home>/jre if we can.
781 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
782 pslash = strrchr(buf, '/');
783 if (pslash != NULL)
784 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
785 dll_path = malloc(strlen(buf) + 1);
786 if (dll_path == NULL)
787 return;
788 strcpy(dll_path, buf);
789 Arguments::set_dll_dir(dll_path);
790
791 if (pslash != NULL) {
792 pslash = strrchr(buf, '/');
793 if (pslash != NULL) {
794 *pslash = '\0'; /* get rid of /<arch> */
795 pslash = strrchr(buf, '/');
796 if (pslash != NULL)
797 *pslash = '\0'; /* get rid of /lib */
798 }
799 }
800
801 home_path = malloc(strlen(buf) + 1);
802 if (home_path == NULL)
803 return;
804 strcpy(home_path, buf);
805 Arguments::set_java_home(home_path);
806
807 if (!set_boot_path('/', ':'))
808 return;
809 }
810
811 /*
812 * Where to look for native libraries
813 */
814 {
815 // Use dlinfo() to determine the correct java.library.path.
816 //
817 // If we're launched by the Java launcher, and the user
818 // does not set java.library.path explicitly on the commandline,
819 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
820 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
821 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
822 // /usr/lib), which is exactly what we want.
823 //
824 // If the user does set java.library.path, it completely
825 // overwrites this setting, and always has.
826 //
827 // If we're not launched by the Java launcher, we may
828 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
829 // settings. Again, dlinfo does exactly what we want.
830
831 Dl_serinfo _info, *info = &_info;
832 Dl_serpath *path;
833 char* library_path;
834 char *common_path;
835 int i;
836
837 // determine search path count and required buffer size
838 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
839 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
840 }
841
842 // allocate new buffer and initialize
843 info = (Dl_serinfo*)malloc(_info.dls_size);
844 if (info == NULL) {
845 vm_exit_out_of_memory(_info.dls_size,
846 "init_system_properties_values info");
847 }
848 info->dls_size = _info.dls_size;
849 info->dls_cnt = _info.dls_cnt;
850
851 // obtain search path information
852 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
853 free(info);
854 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
855 }
856
857 path = &info->dls_serpath[0];
858
859 // Note: Due to a legacy implementation, most of the library path
860 // is set in the launcher. This was to accomodate linking restrictions
861 // on legacy Solaris implementations (which are no longer supported).
862 // Eventually, all the library path setting will be done here.
863 //
864 // However, to prevent the proliferation of improperly built native
865 // libraries, the new path component /usr/jdk/packages is added here.
866
867 // Determine the actual CPU architecture.
868 char cpu_arch[12];
869 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
870 #ifdef _LP64
871 // If we are a 64-bit vm, perform the following translations:
872 // sparc -> sparcv9
873 // i386 -> amd64
874 if (strcmp(cpu_arch, "sparc") == 0)
875 strcat(cpu_arch, "v9");
876 else if (strcmp(cpu_arch, "i386") == 0)
877 strcpy(cpu_arch, "amd64");
878 #endif
879
880 // Construct the invariant part of ld_library_path. Note that the
881 // space for the colon and the trailing null are provided by the
882 // nulls included by the sizeof operator.
883 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
884 common_path = malloc(bufsize);
885 if (common_path == NULL) {
886 free(info);
887 vm_exit_out_of_memory(bufsize,
888 "init_system_properties_values common_path");
889 }
890 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
891
892 // struct size is more than sufficient for the path components obtained
893 // through the dlinfo() call, so only add additional space for the path
894 // components explicitly added here.
895 bufsize = info->dls_size + strlen(common_path);
896 library_path = malloc(bufsize);
897 if (library_path == NULL) {
898 free(info);
899 free(common_path);
900 vm_exit_out_of_memory(bufsize,
901 "init_system_properties_values library_path");
902 }
903 library_path[0] = '\0';
904
905 // Construct the desired Java library path from the linker's library
906 // search path.
907 //
908 // For compatibility, it is optimal that we insert the additional path
909 // components specific to the Java VM after those components specified
910 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
911 // infrastructure.
912 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
913 strcpy(library_path, common_path);
914 } else {
915 int inserted = 0;
916 for (i = 0; i < info->dls_cnt; i++, path++) {
917 uint_t flags = path->dls_flags & LA_SER_MASK;
918 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
919 strcat(library_path, common_path);
920 strcat(library_path, os::path_separator());
921 inserted = 1;
922 }
923 strcat(library_path, path->dls_name);
924 strcat(library_path, os::path_separator());
925 }
926 // eliminate trailing path separator
927 library_path[strlen(library_path)-1] = '\0';
928 }
929
930 // happens before argument parsing - can't use a trace flag
931 // tty->print_raw("init_system_properties_values: native lib path: ");
932 // tty->print_raw_cr(library_path);
933
934 // callee copies into its own buffer
935 Arguments::set_library_path(library_path);
936
937 free(common_path);
938 free(library_path);
939 free(info);
940 }
941
942 /*
943 * Extensions directories.
944 *
945 * Note that the space for the colon and the trailing null are provided
946 * by the nulls included by the sizeof operator (so actually one byte more
947 * than necessary is allocated).
948 */
949 {
950 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
951 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
952 sizeof(EXTENSIONS_DIR));
953 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
954 Arguments::get_java_home());
955 Arguments::set_ext_dirs(buf);
956 }
957
958 /* Endorsed standards default directory. */
959 {
960 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
961 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
962 Arguments::set_endorsed_dirs(buf);
963 }
964 }
965
966 #undef malloc
967 #undef free
968 #undef getenv
969 #undef EXTENSIONS_DIR
970 #undef ENDORSED_DIR
971 #undef COMMON_DIR
972
973 }
974
975 void os::breakpoint() {
976 BREAKPOINT;
977 }
978
979 bool os::obsolete_option(const JavaVMOption *option)
980 {
981 if (!strncmp(option->optionString, "-Xt", 3)) {
982 return true;
983 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
984 return true;
985 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
986 return true;
987 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
988 return true;
989 }
990 return false;
991 }
992
993 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
994 address stackStart = (address)thread->stack_base();
995 address stackEnd = (address)(stackStart - (address)thread->stack_size());
996 if (sp < stackStart && sp >= stackEnd ) return true;
997 return false;
998 }
999
1000 extern "C" void breakpoint() {
1001 // use debugger to set breakpoint here
1002 }
1003
1004 static thread_t main_thread;
1005
1006 // Thread start routine for all new Java threads
1007 extern "C" void* java_start(void* thread_addr) {
1008 // Try to randomize the cache line index of hot stack frames.
1009 // This helps when threads of the same stack traces evict each other's
1010 // cache lines. The threads can be either from the same JVM instance, or
1011 // from different JVM instances. The benefit is especially true for
1012 // processors with hyperthreading technology.
1013 static int counter = 0;
1014 int pid = os::current_process_id();
1015 alloca(((pid ^ counter++) & 7) * 128);
1016
1017 int prio;
1018 Thread* thread = (Thread*)thread_addr;
1019 OSThread* osthr = thread->osthread();
1020
1021 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
1022 thread->_schedctl = (void *) schedctl_init () ;
1023
1024 if (UseNUMA) {
1025 int lgrp_id = os::numa_get_group_id();
1026 if (lgrp_id != -1) {
1027 thread->set_lgrp_id(lgrp_id);
1028 }
1029 }
1030
1031 // If the creator called set priority before we started,
1032 // we need to call set_native_priority now that we have an lwp.
1033 // We used to get the priority from thr_getprio (we called
1034 // thr_setprio way back in create_thread) and pass it to
1035 // set_native_priority, but Solaris scales the priority
1036 // in java_to_os_priority, so when we read it back here,
1037 // we pass trash to set_native_priority instead of what's
1038 // in java_to_os_priority. So we save the native priority
1039 // in the osThread and recall it here.
1040
1041 if ( osthr->thread_id() != -1 ) {
1042 if ( UseThreadPriorities ) {
1043 int prio = osthr->native_priority();
1044 if (ThreadPriorityVerbose) {
1045 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
1046 INTPTR_FORMAT ", setting priority: %d\n",
1047 osthr->thread_id(), osthr->lwp_id(), prio);
1048 }
1049 os::set_native_priority(thread, prio);
1050 }
1051 } else if (ThreadPriorityVerbose) {
1052 warning("Can't set priority in _start routine, thread id hasn't been set\n");
1053 }
1054
1055 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
1056
1057 // initialize signal mask for this thread
1058 os::Solaris::hotspot_sigmask(thread);
1059
1060 thread->run();
1061
1062 // One less thread is executing
1063 // When the VMThread gets here, the main thread may have already exited
1064 // which frees the CodeHeap containing the Atomic::dec code
1065 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
1066 Atomic::dec(&os::Solaris::_os_thread_count);
1067 }
1068
1069 if (UseDetachedThreads) {
1070 thr_exit(NULL);
1071 ShouldNotReachHere();
1072 }
1073 return NULL;
1074 }
1075
1076 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
1077 // Allocate the OSThread object
1078 OSThread* osthread = new OSThread(NULL, NULL);
1079 if (osthread == NULL) return NULL;
1080
1081 // Store info on the Solaris thread into the OSThread
1082 osthread->set_thread_id(thread_id);
1083 osthread->set_lwp_id(_lwp_self());
1084 thread->_schedctl = (void *) schedctl_init () ;
1085
1086 if (UseNUMA) {
1087 int lgrp_id = os::numa_get_group_id();
1088 if (lgrp_id != -1) {
1089 thread->set_lgrp_id(lgrp_id);
1090 }
1091 }
1092
1093 if ( ThreadPriorityVerbose ) {
1094 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1095 osthread->thread_id(), osthread->lwp_id() );
1096 }
1097
1098 // Initial thread state is INITIALIZED, not SUSPENDED
1099 osthread->set_state(INITIALIZED);
1100
1101 return osthread;
1102 }
1103
1104 void os::Solaris::hotspot_sigmask(Thread* thread) {
1105
1106 //Save caller's signal mask
1107 sigset_t sigmask;
1108 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1109 OSThread *osthread = thread->osthread();
1110 osthread->set_caller_sigmask(sigmask);
1111
1112 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1113 if (!ReduceSignalUsage) {
1114 if (thread->is_VM_thread()) {
1115 // Only the VM thread handles BREAK_SIGNAL ...
1116 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1117 } else {
1118 // ... all other threads block BREAK_SIGNAL
1119 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1120 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1121 }
1122 }
1123 }
1124
1125 bool os::create_attached_thread(JavaThread* thread) {
1126 #ifdef ASSERT
1127 thread->verify_not_published();
1128 #endif
1129 OSThread* osthread = create_os_thread(thread, thr_self());
1130 if (osthread == NULL) {
1131 return false;
1132 }
1133
1134 // Initial thread state is RUNNABLE
1135 osthread->set_state(RUNNABLE);
1136 thread->set_osthread(osthread);
1137
1138 // initialize signal mask for this thread
1139 // and save the caller's signal mask
1140 os::Solaris::hotspot_sigmask(thread);
1141
1142 return true;
1143 }
1144
1145 bool os::create_main_thread(JavaThread* thread) {
1146 #ifdef ASSERT
1147 thread->verify_not_published();
1148 #endif
1149 if (_starting_thread == NULL) {
1150 _starting_thread = create_os_thread(thread, main_thread);
1151 if (_starting_thread == NULL) {
1152 return false;
1153 }
1154 }
1155
1156 // The primodial thread is runnable from the start
1157 _starting_thread->set_state(RUNNABLE);
1158
1159 thread->set_osthread(_starting_thread);
1160
1161 // initialize signal mask for this thread
1162 // and save the caller's signal mask
1163 os::Solaris::hotspot_sigmask(thread);
1164
1165 return true;
1166 }
1167
1168 // _T2_libthread is true if we believe we are running with the newer
1169 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1170 bool os::Solaris::_T2_libthread = false;
1171
1172 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1173 // Allocate the OSThread object
1174 OSThread* osthread = new OSThread(NULL, NULL);
1175 if (osthread == NULL) {
1176 return false;
1177 }
1178
1179 if ( ThreadPriorityVerbose ) {
1180 char *thrtyp;
1181 switch ( thr_type ) {
1182 case vm_thread:
1183 thrtyp = (char *)"vm";
1184 break;
1185 case cgc_thread:
1186 thrtyp = (char *)"cgc";
1187 break;
1188 case pgc_thread:
1189 thrtyp = (char *)"pgc";
1190 break;
1191 case java_thread:
1192 thrtyp = (char *)"java";
1193 break;
1194 case compiler_thread:
1195 thrtyp = (char *)"compiler";
1196 break;
1197 case watcher_thread:
1198 thrtyp = (char *)"watcher";
1199 break;
1200 default:
1201 thrtyp = (char *)"unknown";
1202 break;
1203 }
1204 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1205 }
1206
1207 // Calculate stack size if it's not specified by caller.
1208 if (stack_size == 0) {
1209 // The default stack size 1M (2M for LP64).
1210 stack_size = (BytesPerWord >> 2) * K * K;
1211
1212 switch (thr_type) {
1213 case os::java_thread:
1214 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1215 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1216 break;
1217 case os::compiler_thread:
1218 if (CompilerThreadStackSize > 0) {
1219 stack_size = (size_t)(CompilerThreadStackSize * K);
1220 break;
1221 } // else fall through:
1222 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1223 case os::vm_thread:
1224 case os::pgc_thread:
1225 case os::cgc_thread:
1226 case os::watcher_thread:
1227 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1228 break;
1229 }
1230 }
1231 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1232
1233 // Initial state is ALLOCATED but not INITIALIZED
1234 osthread->set_state(ALLOCATED);
1235
1236 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1237 // We got lots of threads. Check if we still have some address space left.
1238 // Need to be at least 5Mb of unreserved address space. We do check by
1239 // trying to reserve some.
1240 const size_t VirtualMemoryBangSize = 20*K*K;
1241 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1242 if (mem == NULL) {
1243 delete osthread;
1244 return false;
1245 } else {
1246 // Release the memory again
1247 os::release_memory(mem, VirtualMemoryBangSize);
1248 }
1249 }
1250
1251 // Setup osthread because the child thread may need it.
1252 thread->set_osthread(osthread);
1253
1254 // Create the Solaris thread
1255 // explicit THR_BOUND for T2_libthread case in case
1256 // that assumption is not accurate, but our alternate signal stack
1257 // handling is based on it which must have bound threads
1258 thread_t tid = 0;
1259 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1260 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1261 (thr_type == vm_thread) ||
1262 (thr_type == cgc_thread) ||
1263 (thr_type == pgc_thread) ||
1264 (thr_type == compiler_thread && BackgroundCompilation)) ?
1265 THR_BOUND : 0);
1266 int status;
1267
1268 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1269 //
1270 // On multiprocessors systems, libthread sometimes under-provisions our
1271 // process with LWPs. On a 30-way systems, for instance, we could have
1272 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1273 // to our process. This can result in under utilization of PEs.
1274 // I suspect the problem is related to libthread's LWP
1275 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1276 // upcall policy.
1277 //
1278 // The following code is palliative -- it attempts to ensure that our
1279 // process has sufficient LWPs to take advantage of multiple PEs.
1280 // Proper long-term cures include using user-level threads bound to LWPs
1281 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1282 // slight timing window with respect to sampling _os_thread_count, but
1283 // the race is benign. Also, we should periodically recompute
1284 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1285 // the number of PEs in our partition. You might be tempted to use
1286 // THR_NEW_LWP here, but I'd recommend against it as that could
1287 // result in undesirable growth of the libthread's LWP pool.
1288 // The fix below isn't sufficient; for instance, it doesn't take into count
1289 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1290 //
1291 // Some pathologies this scheme doesn't handle:
1292 // * Threads can block, releasing the LWPs. The LWPs can age out.
1293 // When a large number of threads become ready again there aren't
1294 // enough LWPs available to service them. This can occur when the
1295 // number of ready threads oscillates.
1296 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1297 //
1298 // Finally, we should call thr_setconcurrency() periodically to refresh
1299 // the LWP pool and thwart the LWP age-out mechanism.
1300 // The "+3" term provides a little slop -- we want to slightly overprovision.
1301
1302 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1303 if (!(flags & THR_BOUND)) {
1304 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1305 }
1306 }
1307 // Although this doesn't hurt, we should warn of undefined behavior
1308 // when using unbound T1 threads with schedctl(). This should never
1309 // happen, as the compiler and VM threads are always created bound
1310 DEBUG_ONLY(
1311 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1312 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1313 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1314 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1315 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1316 }
1317 );
1318
1319
1320 // Mark that we don't have an lwp or thread id yet.
1321 // In case we attempt to set the priority before the thread starts.
1322 osthread->set_lwp_id(-1);
1323 osthread->set_thread_id(-1);
1324
1325 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1326 if (status != 0) {
1327 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1328 perror("os::create_thread");
1329 }
1330 thread->set_osthread(NULL);
1331 // Need to clean up stuff we've allocated so far
1332 delete osthread;
1333 return false;
1334 }
1335
1336 Atomic::inc(&os::Solaris::_os_thread_count);
1337
1338 // Store info on the Solaris thread into the OSThread
1339 osthread->set_thread_id(tid);
1340
1341 // Remember that we created this thread so we can set priority on it
1342 osthread->set_vm_created();
1343
1344 // Set the default thread priority. If using bound threads, setting
1345 // lwp priority will be delayed until thread start.
1346 set_native_priority(thread,
1347 DefaultThreadPriority == -1 ?
1348 java_to_os_priority[NormPriority] :
1349 DefaultThreadPriority);
1350
1351 // Initial thread state is INITIALIZED, not SUSPENDED
1352 osthread->set_state(INITIALIZED);
1353
1354 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1355 return true;
1356 }
1357
1358 /* defined for >= Solaris 10. This allows builds on earlier versions
1359 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1360 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1361 * and -XX:+UseAltSigs does nothing since these should have no conflict
1362 */
1363 #if !defined(SIGJVM1)
1364 #define SIGJVM1 39
1365 #define SIGJVM2 40
1366 #endif
1367
1368 debug_only(static bool signal_sets_initialized = false);
1369 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1370 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1371 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1372
1373 bool os::Solaris::is_sig_ignored(int sig) {
1374 struct sigaction oact;
1375 sigaction(sig, (struct sigaction*)NULL, &oact);
1376 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1377 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1378 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1379 return true;
1380 else
1381 return false;
1382 }
1383
1384 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1385 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1386 static bool isJVM1available() {
1387 return SIGJVM1 < SIGRTMIN;
1388 }
1389
1390 void os::Solaris::signal_sets_init() {
1391 // Should also have an assertion stating we are still single-threaded.
1392 assert(!signal_sets_initialized, "Already initialized");
1393 // Fill in signals that are necessarily unblocked for all threads in
1394 // the VM. Currently, we unblock the following signals:
1395 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1396 // by -Xrs (=ReduceSignalUsage));
1397 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1398 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1399 // the dispositions or masks wrt these signals.
1400 // Programs embedding the VM that want to use the above signals for their
1401 // own purposes must, at this time, use the "-Xrs" option to prevent
1402 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1403 // (See bug 4345157, and other related bugs).
1404 // In reality, though, unblocking these signals is really a nop, since
1405 // these signals are not blocked by default.
1406 sigemptyset(&unblocked_sigs);
1407 sigemptyset(&allowdebug_blocked_sigs);
1408 sigaddset(&unblocked_sigs, SIGILL);
1409 sigaddset(&unblocked_sigs, SIGSEGV);
1410 sigaddset(&unblocked_sigs, SIGBUS);
1411 sigaddset(&unblocked_sigs, SIGFPE);
1412
1413 if (isJVM1available) {
1414 os::Solaris::set_SIGinterrupt(SIGJVM1);
1415 os::Solaris::set_SIGasync(SIGJVM2);
1416 } else if (UseAltSigs) {
1417 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1418 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1419 } else {
1420 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1421 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1422 }
1423
1424 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1425 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1426
1427 if (!ReduceSignalUsage) {
1428 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1429 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1430 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1431 }
1432 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1433 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1434 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1435 }
1436 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1437 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1438 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1439 }
1440 }
1441 // Fill in signals that are blocked by all but the VM thread.
1442 sigemptyset(&vm_sigs);
1443 if (!ReduceSignalUsage)
1444 sigaddset(&vm_sigs, BREAK_SIGNAL);
1445 debug_only(signal_sets_initialized = true);
1446
1447 // For diagnostics only used in run_periodic_checks
1448 sigemptyset(&check_signal_done);
1449 }
1450
1451 // These are signals that are unblocked while a thread is running Java.
1452 // (For some reason, they get blocked by default.)
1453 sigset_t* os::Solaris::unblocked_signals() {
1454 assert(signal_sets_initialized, "Not initialized");
1455 return &unblocked_sigs;
1456 }
1457
1458 // These are the signals that are blocked while a (non-VM) thread is
1459 // running Java. Only the VM thread handles these signals.
1460 sigset_t* os::Solaris::vm_signals() {
1461 assert(signal_sets_initialized, "Not initialized");
1462 return &vm_sigs;
1463 }
1464
1465 // These are signals that are blocked during cond_wait to allow debugger in
1466 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1467 assert(signal_sets_initialized, "Not initialized");
1468 return &allowdebug_blocked_sigs;
1469 }
1470
1471
1472 void _handle_uncaught_cxx_exception() {
1473 VMError err("An uncaught C++ exception");
1474 err.report_and_die();
1475 }
1476
1477
1478 // First crack at OS-specific initialization, from inside the new thread.
1479 void os::initialize_thread(Thread* thr) {
1480 int r = thr_main() ;
1481 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1482 if (r) {
1483 JavaThread* jt = (JavaThread *)thr;
1484 assert(jt != NULL,"Sanity check");
1485 size_t stack_size;
1486 address base = jt->stack_base();
1487 if (Arguments::created_by_java_launcher()) {
1488 // Use 2MB to allow for Solaris 7 64 bit mode.
1489 stack_size = JavaThread::stack_size_at_create() == 0
1490 ? 2048*K : JavaThread::stack_size_at_create();
1491
1492 // There are rare cases when we may have already used more than
1493 // the basic stack size allotment before this method is invoked.
1494 // Attempt to allow for a normally sized java_stack.
1495 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1496 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1497 } else {
1498 // 6269555: If we were not created by a Java launcher, i.e. if we are
1499 // running embedded in a native application, treat the primordial thread
1500 // as much like a native attached thread as possible. This means using
1501 // the current stack size from thr_stksegment(), unless it is too large
1502 // to reliably setup guard pages. A reasonable max size is 8MB.
1503 size_t current_size = current_stack_size();
1504 // This should never happen, but just in case....
1505 if (current_size == 0) current_size = 2 * K * K;
1506 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1507 }
1508 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1509 stack_size = (size_t)(base - bottom);
1510
1511 assert(stack_size > 0, "Stack size calculation problem");
1512
1513 if (stack_size > jt->stack_size()) {
1514 NOT_PRODUCT(
1515 struct rlimit limits;
1516 getrlimit(RLIMIT_STACK, &limits);
1517 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1518 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1519 )
1520 tty->print_cr(
1521 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1522 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1523 "See limit(1) to increase the stack size limit.",
1524 stack_size / K, jt->stack_size() / K);
1525 vm_exit(1);
1526 }
1527 assert(jt->stack_size() >= stack_size,
1528 "Attempt to map more stack than was allocated");
1529 jt->set_stack_size(stack_size);
1530 }
1531
1532 // 5/22/01: Right now alternate signal stacks do not handle
1533 // throwing stack overflow exceptions, see bug 4463178
1534 // Until a fix is found for this, T2 will NOT imply alternate signal
1535 // stacks.
1536 // If using T2 libthread threads, install an alternate signal stack.
1537 // Because alternate stacks associate with LWPs on Solaris,
1538 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1539 // we prefer to explicitly stack bang.
1540 // If not using T2 libthread, but using UseBoundThreads any threads
1541 // (primordial thread, jni_attachCurrentThread) we do not create,
1542 // probably are not bound, therefore they can not have an alternate
1543 // signal stack. Since our stack banging code is generated and
1544 // is shared across threads, all threads must be bound to allow
1545 // using alternate signal stacks. The alternative is to interpose
1546 // on _lwp_create to associate an alt sig stack with each LWP,
1547 // and this could be a problem when the JVM is embedded.
1548 // We would prefer to use alternate signal stacks with T2
1549 // Since there is currently no accurate way to detect T2
1550 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1551 // on installing alternate signal stacks
1552
1553
1554 // 05/09/03: removed alternate signal stack support for Solaris
1555 // The alternate signal stack mechanism is no longer needed to
1556 // handle stack overflow. This is now handled by allocating
1557 // guard pages (red zone) and stackbanging.
1558 // Initially the alternate signal stack mechanism was removed because
1559 // it did not work with T1 llibthread. Alternate
1560 // signal stacks MUST have all threads bound to lwps. Applications
1561 // can create their own threads and attach them without their being
1562 // bound under T1. This is frequently the case for the primordial thread.
1563 // If we were ever to reenable this mechanism we would need to
1564 // use the dynamic check for T2 libthread.
1565
1566 os::Solaris::init_thread_fpu_state();
1567 std::set_terminate(_handle_uncaught_cxx_exception);
1568 }
1569
1570
1571
1572 // Free Solaris resources related to the OSThread
1573 void os::free_thread(OSThread* osthread) {
1574 assert(osthread != NULL, "os::free_thread but osthread not set");
1575
1576
1577 // We are told to free resources of the argument thread,
1578 // but we can only really operate on the current thread.
1579 // The main thread must take the VMThread down synchronously
1580 // before the main thread exits and frees up CodeHeap
1581 guarantee((Thread::current()->osthread() == osthread
1582 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1583 if (Thread::current()->osthread() == osthread) {
1584 // Restore caller's signal mask
1585 sigset_t sigmask = osthread->caller_sigmask();
1586 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1587 }
1588 delete osthread;
1589 }
1590
1591 void os::pd_start_thread(Thread* thread) {
1592 int status = thr_continue(thread->osthread()->thread_id());
1593 assert_status(status == 0, status, "thr_continue failed");
1594 }
1595
1596
1597 intx os::current_thread_id() {
1598 return (intx)thr_self();
1599 }
1600
1601 static pid_t _initial_pid = 0;
1602
1603 int os::current_process_id() {
1604 return (int)(_initial_pid ? _initial_pid : getpid());
1605 }
1606
1607 int os::allocate_thread_local_storage() {
1608 // %%% in Win32 this allocates a memory segment pointed to by a
1609 // register. Dan Stein can implement a similar feature in
1610 // Solaris. Alternatively, the VM can do the same thing
1611 // explicitly: malloc some storage and keep the pointer in a
1612 // register (which is part of the thread's context) (or keep it
1613 // in TLS).
1614 // %%% In current versions of Solaris, thr_self and TSD can
1615 // be accessed via short sequences of displaced indirections.
1616 // The value of thr_self is available as %g7(36).
1617 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1618 // assuming that the current thread already has a value bound to k.
1619 // It may be worth experimenting with such access patterns,
1620 // and later having the parameters formally exported from a Solaris
1621 // interface. I think, however, that it will be faster to
1622 // maintain the invariant that %g2 always contains the
1623 // JavaThread in Java code, and have stubs simply
1624 // treat %g2 as a caller-save register, preserving it in a %lN.
1625 thread_key_t tk;
1626 if (thr_keycreate( &tk, NULL ) )
1627 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1628 "(%s)", strerror(errno)));
1629 return int(tk);
1630 }
1631
1632 void os::free_thread_local_storage(int index) {
1633 // %%% don't think we need anything here
1634 // if ( pthread_key_delete((pthread_key_t) tk) )
1635 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1636 }
1637
1638 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1639 // small number - point is NO swap space available
1640 void os::thread_local_storage_at_put(int index, void* value) {
1641 // %%% this is used only in threadLocalStorage.cpp
1642 if (thr_setspecific((thread_key_t)index, value)) {
1643 if (errno == ENOMEM) {
1644 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space");
1645 } else {
1646 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1647 "(%s)", strerror(errno)));
1648 }
1649 } else {
1650 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1651 }
1652 }
1653
1654 // This function could be called before TLS is initialized, for example, when
1655 // VM receives an async signal or when VM causes a fatal error during
1656 // initialization. Return NULL if thr_getspecific() fails.
1657 void* os::thread_local_storage_at(int index) {
1658 // %%% this is used only in threadLocalStorage.cpp
1659 void* r = NULL;
1660 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1661 }
1662
1663
1664 // gethrtime can move backwards if read from one cpu and then a different cpu
1665 // getTimeNanos is guaranteed to not move backward on Solaris
1666 // local spinloop created as faster for a CAS on an int than
1667 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1668 // supported on sparc v8 or pre supports_cx8 intel boxes.
1669 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1670 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1671 inline hrtime_t oldgetTimeNanos() {
1672 int gotlock = LOCK_INVALID;
1673 hrtime_t newtime = gethrtime();
1674
1675 for (;;) {
1676 // grab lock for max_hrtime
1677 int curlock = max_hrtime_lock;
1678 if (curlock & LOCK_BUSY) continue;
1679 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1680 if (newtime > max_hrtime) {
1681 max_hrtime = newtime;
1682 } else {
1683 newtime = max_hrtime;
1684 }
1685 // release lock
1686 max_hrtime_lock = LOCK_FREE;
1687 return newtime;
1688 }
1689 }
1690 // gethrtime can move backwards if read from one cpu and then a different cpu
1691 // getTimeNanos is guaranteed to not move backward on Solaris
1692 inline hrtime_t getTimeNanos() {
1693 if (VM_Version::supports_cx8()) {
1694 const hrtime_t now = gethrtime();
1695 // Use atomic long load since 32-bit x86 uses 2 registers to keep long.
1696 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime);
1697 if (now <= prev) return prev; // same or retrograde time;
1698 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1699 assert(obsv >= prev, "invariant"); // Monotonicity
1700 // If the CAS succeeded then we're done and return "now".
1701 // If the CAS failed and the observed value "obs" is >= now then
1702 // we should return "obs". If the CAS failed and now > obs > prv then
1703 // some other thread raced this thread and installed a new value, in which case
1704 // we could either (a) retry the entire operation, (b) retry trying to install now
1705 // or (c) just return obs. We use (c). No loop is required although in some cases
1706 // we might discard a higher "now" value in deference to a slightly lower but freshly
1707 // installed obs value. That's entirely benign -- it admits no new orderings compared
1708 // to (a) or (b) -- and greatly reduces coherence traffic.
1709 // We might also condition (c) on the magnitude of the delta between obs and now.
1710 // Avoiding excessive CAS operations to hot RW locations is critical.
1711 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1712 return (prev == obsv) ? now : obsv ;
1713 } else {
1714 return oldgetTimeNanos();
1715 }
1716 }
1717
1718 // Time since start-up in seconds to a fine granularity.
1719 // Used by VMSelfDestructTimer and the MemProfiler.
1720 double os::elapsedTime() {
1721 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1722 }
1723
1724 jlong os::elapsed_counter() {
1725 return (jlong)(getTimeNanos() - first_hrtime);
1726 }
1727
1728 jlong os::elapsed_frequency() {
1729 return hrtime_hz;
1730 }
1731
1732 // Return the real, user, and system times in seconds from an
1733 // arbitrary fixed point in the past.
1734 bool os::getTimesSecs(double* process_real_time,
1735 double* process_user_time,
1736 double* process_system_time) {
1737 struct tms ticks;
1738 clock_t real_ticks = times(&ticks);
1739
1740 if (real_ticks == (clock_t) (-1)) {
1741 return false;
1742 } else {
1743 double ticks_per_second = (double) clock_tics_per_sec;
1744 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1745 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1746 // For consistency return the real time from getTimeNanos()
1747 // converted to seconds.
1748 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1749
1750 return true;
1751 }
1752 }
1753
1754 bool os::supports_vtime() { return true; }
1755
1756 bool os::enable_vtime() {
1757 int fd = ::open("/proc/self/ctl", O_WRONLY);
1758 if (fd == -1)
1759 return false;
1760
1761 long cmd[] = { PCSET, PR_MSACCT };
1762 int res = ::write(fd, cmd, sizeof(long) * 2);
1763 ::close(fd);
1764 if (res != sizeof(long) * 2)
1765 return false;
1766
1767 return true;
1768 }
1769
1770 bool os::vtime_enabled() {
1771 int fd = ::open("/proc/self/status", O_RDONLY);
1772 if (fd == -1)
1773 return false;
1774
1775 pstatus_t status;
1776 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1777 ::close(fd);
1778 if (res != sizeof(pstatus_t))
1779 return false;
1780
1781 return status.pr_flags & PR_MSACCT;
1782 }
1783
1784 double os::elapsedVTime() {
1785 return (double)gethrvtime() / (double)hrtime_hz;
1786 }
1787
1788 // Used internally for comparisons only
1789 // getTimeMillis guaranteed to not move backwards on Solaris
1790 jlong getTimeMillis() {
1791 jlong nanotime = getTimeNanos();
1792 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1793 }
1794
1795 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1796 jlong os::javaTimeMillis() {
1797 timeval t;
1798 if (gettimeofday( &t, NULL) == -1)
1799 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1800 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1801 }
1802
1803 jlong os::javaTimeNanos() {
1804 return (jlong)getTimeNanos();
1805 }
1806
1807 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1808 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1809 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1810 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1811 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1812 }
1813
1814 char * os::local_time_string(char *buf, size_t buflen) {
1815 struct tm t;
1816 time_t long_time;
1817 time(&long_time);
1818 localtime_r(&long_time, &t);
1819 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1820 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1821 t.tm_hour, t.tm_min, t.tm_sec);
1822 return buf;
1823 }
1824
1825 // Note: os::shutdown() might be called very early during initialization, or
1826 // called from signal handler. Before adding something to os::shutdown(), make
1827 // sure it is async-safe and can handle partially initialized VM.
1828 void os::shutdown() {
1829
1830 // allow PerfMemory to attempt cleanup of any persistent resources
1831 perfMemory_exit();
1832
1833 // needs to remove object in file system
1834 AttachListener::abort();
1835
1836 // flush buffered output, finish log files
1837 ostream_abort();
1838
1839 // Check for abort hook
1840 abort_hook_t abort_hook = Arguments::abort_hook();
1841 if (abort_hook != NULL) {
1842 abort_hook();
1843 }
1844 }
1845
1846 // Note: os::abort() might be called very early during initialization, or
1847 // called from signal handler. Before adding something to os::abort(), make
1848 // sure it is async-safe and can handle partially initialized VM.
1849 void os::abort(bool dump_core) {
1850 os::shutdown();
1851 if (dump_core) {
1852 #ifndef PRODUCT
1853 fdStream out(defaultStream::output_fd());
1854 out.print_raw("Current thread is ");
1855 char buf[16];
1856 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1857 out.print_raw_cr(buf);
1858 out.print_raw_cr("Dumping core ...");
1859 #endif
1860 ::abort(); // dump core (for debugging)
1861 }
1862
1863 ::exit(1);
1864 }
1865
1866 // Die immediately, no exit hook, no abort hook, no cleanup.
1867 void os::die() {
1868 ::abort(); // dump core (for debugging)
1869 }
1870
1871 // unused
1872 void os::set_error_file(const char *logfile) {}
1873
1874 // DLL functions
1875
1876 const char* os::dll_file_extension() { return ".so"; }
1877
1878 // This must be hard coded because it's the system's temporary
1879 // directory not the java application's temp directory, ala java.io.tmpdir.
1880 const char* os::get_temp_directory() { return "/tmp"; }
1881
1882 static bool file_exists(const char* filename) {
1883 struct stat statbuf;
1884 if (filename == NULL || strlen(filename) == 0) {
1885 return false;
1886 }
1887 return os::stat(filename, &statbuf) == 0;
1888 }
1889
1890 bool os::dll_build_name(char* buffer, size_t buflen,
1891 const char* pname, const char* fname) {
1892 bool retval = false;
1893 const size_t pnamelen = pname ? strlen(pname) : 0;
1894
1895 // Return error on buffer overflow.
1896 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1897 return retval;
1898 }
1899
1900 if (pnamelen == 0) {
1901 snprintf(buffer, buflen, "lib%s.so", fname);
1902 retval = true;
1903 } else if (strchr(pname, *os::path_separator()) != NULL) {
1904 int n;
1905 char** pelements = split_path(pname, &n);
1906 for (int i = 0 ; i < n ; i++) {
1907 // really shouldn't be NULL but what the heck, check can't hurt
1908 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1909 continue; // skip the empty path values
1910 }
1911 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1912 if (file_exists(buffer)) {
1913 retval = true;
1914 break;
1915 }
1916 }
1917 // release the storage
1918 for (int i = 0 ; i < n ; i++) {
1919 if (pelements[i] != NULL) {
1920 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1921 }
1922 }
1923 if (pelements != NULL) {
1924 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1925 }
1926 } else {
1927 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1928 retval = true;
1929 }
1930 return retval;
1931 }
1932
1933 const char* os::get_current_directory(char *buf, int buflen) {
1934 return getcwd(buf, buflen);
1935 }
1936
1937 // check if addr is inside libjvm.so
1938 bool os::address_is_in_vm(address addr) {
1939 static address libjvm_base_addr;
1940 Dl_info dlinfo;
1941
1942 if (libjvm_base_addr == NULL) {
1943 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1944 libjvm_base_addr = (address)dlinfo.dli_fbase;
1945 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1946 }
1947
1948 if (dladdr((void *)addr, &dlinfo)) {
1949 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1950 }
1951
1952 return false;
1953 }
1954
1955 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1956 static dladdr1_func_type dladdr1_func = NULL;
1957
1958 bool os::dll_address_to_function_name(address addr, char *buf,
1959 int buflen, int * offset) {
1960 Dl_info dlinfo;
1961
1962 // dladdr1_func was initialized in os::init()
1963 if (dladdr1_func){
1964 // yes, we have dladdr1
1965
1966 // Support for dladdr1 is checked at runtime; it may be
1967 // available even if the vm is built on a machine that does
1968 // not have dladdr1 support. Make sure there is a value for
1969 // RTLD_DL_SYMENT.
1970 #ifndef RTLD_DL_SYMENT
1971 #define RTLD_DL_SYMENT 1
1972 #endif
1973 #ifdef _LP64
1974 Elf64_Sym * info;
1975 #else
1976 Elf32_Sym * info;
1977 #endif
1978 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1979 RTLD_DL_SYMENT)) {
1980 if ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1981 if (buf != NULL) {
1982 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
1983 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1984 }
1985 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1986 return true;
1987 }
1988 }
1989 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1990 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1991 buf, buflen, offset, dlinfo.dli_fname)) {
1992 return true;
1993 }
1994 }
1995 if (buf != NULL) buf[0] = '\0';
1996 if (offset != NULL) *offset = -1;
1997 return false;
1998 } else {
1999 // no, only dladdr is available
2000 if (dladdr((void *)addr, &dlinfo)) {
2001 if (buf != NULL) {
2002 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
2003 jio_snprintf(buf, buflen, dlinfo.dli_sname);
2004 }
2005 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
2006 return true;
2007 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
2008 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
2009 buf, buflen, offset, dlinfo.dli_fname)) {
2010 return true;
2011 }
2012 }
2013 if (buf != NULL) buf[0] = '\0';
2014 if (offset != NULL) *offset = -1;
2015 return false;
2016 }
2017 }
2018
2019 bool os::dll_address_to_library_name(address addr, char* buf,
2020 int buflen, int* offset) {
2021 Dl_info dlinfo;
2022
2023 if (dladdr((void*)addr, &dlinfo)){
2024 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
2025 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
2026 return true;
2027 } else {
2028 if (buf) buf[0] = '\0';
2029 if (offset) *offset = -1;
2030 return false;
2031 }
2032 }
2033
2034 // Prints the names and full paths of all opened dynamic libraries
2035 // for current process
2036 void os::print_dll_info(outputStream * st) {
2037 Dl_info dli;
2038 void *handle;
2039 Link_map *map;
2040 Link_map *p;
2041
2042 st->print_cr("Dynamic libraries:"); st->flush();
2043
2044 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
2045 st->print_cr("Error: Cannot print dynamic libraries.");
2046 return;
2047 }
2048 handle = dlopen(dli.dli_fname, RTLD_LAZY);
2049 if (handle == NULL) {
2050 st->print_cr("Error: Cannot print dynamic libraries.");
2051 return;
2052 }
2053 dlinfo(handle, RTLD_DI_LINKMAP, &map);
2054 if (map == NULL) {
2055 st->print_cr("Error: Cannot print dynamic libraries.");
2056 return;
2057 }
2058
2059 while (map->l_prev != NULL)
2060 map = map->l_prev;
2061
2062 while (map != NULL) {
2063 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2064 map = map->l_next;
2065 }
2066
2067 dlclose(handle);
2068 }
2069
2070 // Loads .dll/.so and
2071 // in case of error it checks if .dll/.so was built for the
2072 // same architecture as Hotspot is running on
2073
2074 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2075 {
2076 void * result= ::dlopen(filename, RTLD_LAZY);
2077 if (result != NULL) {
2078 // Successful loading
2079 return result;
2080 }
2081
2082 Elf32_Ehdr elf_head;
2083
2084 // Read system error message into ebuf
2085 // It may or may not be overwritten below
2086 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2087 ebuf[ebuflen-1]='\0';
2088 int diag_msg_max_length=ebuflen-strlen(ebuf);
2089 char* diag_msg_buf=ebuf+strlen(ebuf);
2090
2091 if (diag_msg_max_length==0) {
2092 // No more space in ebuf for additional diagnostics message
2093 return NULL;
2094 }
2095
2096
2097 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2098
2099 if (file_descriptor < 0) {
2100 // Can't open library, report dlerror() message
2101 return NULL;
2102 }
2103
2104 bool failed_to_read_elf_head=
2105 (sizeof(elf_head)!=
2106 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2107
2108 ::close(file_descriptor);
2109 if (failed_to_read_elf_head) {
2110 // file i/o error - report dlerror() msg
2111 return NULL;
2112 }
2113
2114 typedef struct {
2115 Elf32_Half code; // Actual value as defined in elf.h
2116 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2117 char elf_class; // 32 or 64 bit
2118 char endianess; // MSB or LSB
2119 char* name; // String representation
2120 } arch_t;
2121
2122 static const arch_t arch_array[]={
2123 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2124 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2125 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2126 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2127 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2128 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2129 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2130 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2131 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2132 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2133 };
2134
2135 #if (defined IA32)
2136 static Elf32_Half running_arch_code=EM_386;
2137 #elif (defined AMD64)
2138 static Elf32_Half running_arch_code=EM_X86_64;
2139 #elif (defined IA64)
2140 static Elf32_Half running_arch_code=EM_IA_64;
2141 #elif (defined __sparc) && (defined _LP64)
2142 static Elf32_Half running_arch_code=EM_SPARCV9;
2143 #elif (defined __sparc) && (!defined _LP64)
2144 static Elf32_Half running_arch_code=EM_SPARC;
2145 #elif (defined __powerpc64__)
2146 static Elf32_Half running_arch_code=EM_PPC64;
2147 #elif (defined __powerpc__)
2148 static Elf32_Half running_arch_code=EM_PPC;
2149 #elif (defined ARM)
2150 static Elf32_Half running_arch_code=EM_ARM;
2151 #else
2152 #error Method os::dll_load requires that one of following is defined:\
2153 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2154 #endif
2155
2156 // Identify compatability class for VM's architecture and library's architecture
2157 // Obtain string descriptions for architectures
2158
2159 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2160 int running_arch_index=-1;
2161
2162 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2163 if (running_arch_code == arch_array[i].code) {
2164 running_arch_index = i;
2165 }
2166 if (lib_arch.code == arch_array[i].code) {
2167 lib_arch.compat_class = arch_array[i].compat_class;
2168 lib_arch.name = arch_array[i].name;
2169 }
2170 }
2171
2172 assert(running_arch_index != -1,
2173 "Didn't find running architecture code (running_arch_code) in arch_array");
2174 if (running_arch_index == -1) {
2175 // Even though running architecture detection failed
2176 // we may still continue with reporting dlerror() message
2177 return NULL;
2178 }
2179
2180 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2181 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2182 return NULL;
2183 }
2184
2185 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2186 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2187 return NULL;
2188 }
2189
2190 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2191 if ( lib_arch.name!=NULL ) {
2192 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2193 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2194 lib_arch.name, arch_array[running_arch_index].name);
2195 } else {
2196 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2197 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2198 lib_arch.code,
2199 arch_array[running_arch_index].name);
2200 }
2201 }
2202
2203 return NULL;
2204 }
2205
2206 void* os::dll_lookup(void* handle, const char* name) {
2207 return dlsym(handle, name);
2208 }
2209
2210 int os::stat(const char *path, struct stat *sbuf) {
2211 char pathbuf[MAX_PATH];
2212 if (strlen(path) > MAX_PATH - 1) {
2213 errno = ENAMETOOLONG;
2214 return -1;
2215 }
2216 os::native_path(strcpy(pathbuf, path));
2217 return ::stat(pathbuf, sbuf);
2218 }
2219
2220 static bool _print_ascii_file(const char* filename, outputStream* st) {
2221 int fd = ::open(filename, O_RDONLY);
2222 if (fd == -1) {
2223 return false;
2224 }
2225
2226 char buf[32];
2227 int bytes;
2228 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2229 st->print_raw(buf, bytes);
2230 }
2231
2232 ::close(fd);
2233
2234 return true;
2235 }
2236
2237 void os::print_os_info_brief(outputStream* st) {
2238 os::Solaris::print_distro_info(st);
2239
2240 os::Posix::print_uname_info(st);
2241
2242 os::Solaris::print_libversion_info(st);
2243 }
2244
2245 void os::print_os_info(outputStream* st) {
2246 st->print("OS:");
2247
2248 os::Solaris::print_distro_info(st);
2249
2250 os::Posix::print_uname_info(st);
2251
2252 os::Solaris::print_libversion_info(st);
2253
2254 os::Posix::print_rlimit_info(st);
2255
2256 os::Posix::print_load_average(st);
2257 }
2258
2259 void os::Solaris::print_distro_info(outputStream* st) {
2260 if (!_print_ascii_file("/etc/release", st)) {
2261 st->print("Solaris");
2262 }
2263 st->cr();
2264 }
2265
2266 void os::Solaris::print_libversion_info(outputStream* st) {
2267 if (os::Solaris::T2_libthread()) {
2268 st->print(" (T2 libthread)");
2269 }
2270 else {
2271 st->print(" (T1 libthread)");
2272 }
2273 st->cr();
2274 }
2275
2276 static bool check_addr0(outputStream* st) {
2277 jboolean status = false;
2278 int fd = ::open("/proc/self/map",O_RDONLY);
2279 if (fd >= 0) {
2280 prmap_t p;
2281 while(::read(fd, &p, sizeof(p)) > 0) {
2282 if (p.pr_vaddr == 0x0) {
2283 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2284 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2285 st->print("Access:");
2286 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2287 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2288 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2289 st->cr();
2290 status = true;
2291 }
2292 ::close(fd);
2293 }
2294 }
2295 return status;
2296 }
2297
2298 void os::pd_print_cpu_info(outputStream* st) {
2299 // Nothing to do for now.
2300 }
2301
2302 void os::print_memory_info(outputStream* st) {
2303 st->print("Memory:");
2304 st->print(" %dk page", os::vm_page_size()>>10);
2305 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2306 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2307 st->cr();
2308 (void) check_addr0(st);
2309 }
2310
2311 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2312 // but they're the same for all the solaris architectures that we support.
2313 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2314 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2315 "ILL_COPROC", "ILL_BADSTK" };
2316
2317 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2318 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2319 "FPE_FLTINV", "FPE_FLTSUB" };
2320
2321 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2322
2323 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2324
2325 void os::print_siginfo(outputStream* st, void* siginfo) {
2326 st->print("siginfo:");
2327
2328 const int buflen = 100;
2329 char buf[buflen];
2330 siginfo_t *si = (siginfo_t*)siginfo;
2331 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2332 char *err = strerror(si->si_errno);
2333 if (si->si_errno != 0 && err != NULL) {
2334 st->print("si_errno=%s", err);
2335 } else {
2336 st->print("si_errno=%d", si->si_errno);
2337 }
2338 const int c = si->si_code;
2339 assert(c > 0, "unexpected si_code");
2340 switch (si->si_signo) {
2341 case SIGILL:
2342 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2343 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2344 break;
2345 case SIGFPE:
2346 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2347 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2348 break;
2349 case SIGSEGV:
2350 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2351 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2352 break;
2353 case SIGBUS:
2354 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2355 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2356 break;
2357 default:
2358 st->print(", si_code=%d", si->si_code);
2359 // no si_addr
2360 }
2361
2362 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2363 UseSharedSpaces) {
2364 FileMapInfo* mapinfo = FileMapInfo::current_info();
2365 if (mapinfo->is_in_shared_space(si->si_addr)) {
2366 st->print("\n\nError accessing class data sharing archive." \
2367 " Mapped file inaccessible during execution, " \
2368 " possible disk/network problem.");
2369 }
2370 }
2371 st->cr();
2372 }
2373
2374 // Moved from whole group, because we need them here for diagnostic
2375 // prints.
2376 #define OLDMAXSIGNUM 32
2377 static int Maxsignum = 0;
2378 static int *ourSigFlags = NULL;
2379
2380 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2381
2382 int os::Solaris::get_our_sigflags(int sig) {
2383 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2384 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2385 return ourSigFlags[sig];
2386 }
2387
2388 void os::Solaris::set_our_sigflags(int sig, int flags) {
2389 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2390 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2391 ourSigFlags[sig] = flags;
2392 }
2393
2394
2395 static const char* get_signal_handler_name(address handler,
2396 char* buf, int buflen) {
2397 int offset;
2398 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2399 if (found) {
2400 // skip directory names
2401 const char *p1, *p2;
2402 p1 = buf;
2403 size_t len = strlen(os::file_separator());
2404 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2405 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2406 } else {
2407 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2408 }
2409 return buf;
2410 }
2411
2412 static void print_signal_handler(outputStream* st, int sig,
2413 char* buf, size_t buflen) {
2414 struct sigaction sa;
2415
2416 sigaction(sig, NULL, &sa);
2417
2418 st->print("%s: ", os::exception_name(sig, buf, buflen));
2419
2420 address handler = (sa.sa_flags & SA_SIGINFO)
2421 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2422 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2423
2424 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2425 st->print("SIG_DFL");
2426 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2427 st->print("SIG_IGN");
2428 } else {
2429 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2430 }
2431
2432 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2433
2434 address rh = VMError::get_resetted_sighandler(sig);
2435 // May be, handler was resetted by VMError?
2436 if(rh != NULL) {
2437 handler = rh;
2438 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2439 }
2440
2441 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2442
2443 // Check: is it our handler?
2444 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2445 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2446 // It is our signal handler
2447 // check for flags
2448 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2449 st->print(
2450 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2451 os::Solaris::get_our_sigflags(sig));
2452 }
2453 }
2454 st->cr();
2455 }
2456
2457 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2458 st->print_cr("Signal Handlers:");
2459 print_signal_handler(st, SIGSEGV, buf, buflen);
2460 print_signal_handler(st, SIGBUS , buf, buflen);
2461 print_signal_handler(st, SIGFPE , buf, buflen);
2462 print_signal_handler(st, SIGPIPE, buf, buflen);
2463 print_signal_handler(st, SIGXFSZ, buf, buflen);
2464 print_signal_handler(st, SIGILL , buf, buflen);
2465 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2466 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2467 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2468 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2469 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2470 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2471 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2472 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2473 }
2474
2475 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2476
2477 // Find the full path to the current module, libjvm.so
2478 void os::jvm_path(char *buf, jint buflen) {
2479 // Error checking.
2480 if (buflen < MAXPATHLEN) {
2481 assert(false, "must use a large-enough buffer");
2482 buf[0] = '\0';
2483 return;
2484 }
2485 // Lazy resolve the path to current module.
2486 if (saved_jvm_path[0] != 0) {
2487 strcpy(buf, saved_jvm_path);
2488 return;
2489 }
2490
2491 Dl_info dlinfo;
2492 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2493 assert(ret != 0, "cannot locate libjvm");
2494 realpath((char *)dlinfo.dli_fname, buf);
2495
2496 if (Arguments::created_by_gamma_launcher()) {
2497 // Support for the gamma launcher. Typical value for buf is
2498 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2499 // the right place in the string, then assume we are installed in a JDK and
2500 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2501 // up the path so it looks like libjvm.so is installed there (append a
2502 // fake suffix hotspot/libjvm.so).
2503 const char *p = buf + strlen(buf) - 1;
2504 for (int count = 0; p > buf && count < 5; ++count) {
2505 for (--p; p > buf && *p != '/'; --p)
2506 /* empty */ ;
2507 }
2508
2509 if (strncmp(p, "/jre/lib/", 9) != 0) {
2510 // Look for JAVA_HOME in the environment.
2511 char* java_home_var = ::getenv("JAVA_HOME");
2512 if (java_home_var != NULL && java_home_var[0] != 0) {
2513 char cpu_arch[12];
2514 char* jrelib_p;
2515 int len;
2516 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2517 #ifdef _LP64
2518 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2519 if (strcmp(cpu_arch, "sparc") == 0) {
2520 strcat(cpu_arch, "v9");
2521 } else if (strcmp(cpu_arch, "i386") == 0) {
2522 strcpy(cpu_arch, "amd64");
2523 }
2524 #endif
2525 // Check the current module name "libjvm.so".
2526 p = strrchr(buf, '/');
2527 assert(strstr(p, "/libjvm") == p, "invalid library name");
2528
2529 realpath(java_home_var, buf);
2530 // determine if this is a legacy image or modules image
2531 // modules image doesn't have "jre" subdirectory
2532 len = strlen(buf);
2533 jrelib_p = buf + len;
2534 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2535 if (0 != access(buf, F_OK)) {
2536 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2537 }
2538
2539 if (0 == access(buf, F_OK)) {
2540 // Use current module name "libjvm.so"
2541 len = strlen(buf);
2542 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2543 } else {
2544 // Go back to path of .so
2545 realpath((char *)dlinfo.dli_fname, buf);
2546 }
2547 }
2548 }
2549 }
2550
2551 strcpy(saved_jvm_path, buf);
2552 }
2553
2554
2555 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2556 // no prefix required, not even "_"
2557 }
2558
2559
2560 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2561 // no suffix required
2562 }
2563
2564 // This method is a copy of JDK's sysGetLastErrorString
2565 // from src/solaris/hpi/src/system_md.c
2566
2567 size_t os::lasterror(char *buf, size_t len) {
2568
2569 if (errno == 0) return 0;
2570
2571 const char *s = ::strerror(errno);
2572 size_t n = ::strlen(s);
2573 if (n >= len) {
2574 n = len - 1;
2575 }
2576 ::strncpy(buf, s, n);
2577 buf[n] = '\0';
2578 return n;
2579 }
2580
2581
2582 // sun.misc.Signal
2583
2584 extern "C" {
2585 static void UserHandler(int sig, void *siginfo, void *context) {
2586 // Ctrl-C is pressed during error reporting, likely because the error
2587 // handler fails to abort. Let VM die immediately.
2588 if (sig == SIGINT && is_error_reported()) {
2589 os::die();
2590 }
2591
2592 os::signal_notify(sig);
2593 // We do not need to reinstate the signal handler each time...
2594 }
2595 }
2596
2597 void* os::user_handler() {
2598 return CAST_FROM_FN_PTR(void*, UserHandler);
2599 }
2600
2601 extern "C" {
2602 typedef void (*sa_handler_t)(int);
2603 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2604 }
2605
2606 void* os::signal(int signal_number, void* handler) {
2607 struct sigaction sigAct, oldSigAct;
2608 sigfillset(&(sigAct.sa_mask));
2609 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2610 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2611
2612 if (sigaction(signal_number, &sigAct, &oldSigAct))
2613 // -1 means registration failed
2614 return (void *)-1;
2615
2616 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2617 }
2618
2619 void os::signal_raise(int signal_number) {
2620 raise(signal_number);
2621 }
2622
2623 /*
2624 * The following code is moved from os.cpp for making this
2625 * code platform specific, which it is by its very nature.
2626 */
2627
2628 // a counter for each possible signal value
2629 static int Sigexit = 0;
2630 static int Maxlibjsigsigs;
2631 static jint *pending_signals = NULL;
2632 static int *preinstalled_sigs = NULL;
2633 static struct sigaction *chainedsigactions = NULL;
2634 static sema_t sig_sem;
2635 typedef int (*version_getting_t)();
2636 version_getting_t os::Solaris::get_libjsig_version = NULL;
2637 static int libjsigversion = NULL;
2638
2639 int os::sigexitnum_pd() {
2640 assert(Sigexit > 0, "signal memory not yet initialized");
2641 return Sigexit;
2642 }
2643
2644 void os::Solaris::init_signal_mem() {
2645 // Initialize signal structures
2646 Maxsignum = SIGRTMAX;
2647 Sigexit = Maxsignum+1;
2648 assert(Maxsignum >0, "Unable to obtain max signal number");
2649
2650 Maxlibjsigsigs = Maxsignum;
2651
2652 // pending_signals has one int per signal
2653 // The additional signal is for SIGEXIT - exit signal to signal_thread
2654 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2655 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2656
2657 if (UseSignalChaining) {
2658 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2659 * (Maxsignum + 1), mtInternal);
2660 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2661 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2662 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2663 }
2664 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2665 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2666 }
2667
2668 void os::signal_init_pd() {
2669 int ret;
2670
2671 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2672 assert(ret == 0, "sema_init() failed");
2673 }
2674
2675 void os::signal_notify(int signal_number) {
2676 int ret;
2677
2678 Atomic::inc(&pending_signals[signal_number]);
2679 ret = ::sema_post(&sig_sem);
2680 assert(ret == 0, "sema_post() failed");
2681 }
2682
2683 static int check_pending_signals(bool wait_for_signal) {
2684 int ret;
2685 while (true) {
2686 for (int i = 0; i < Sigexit + 1; i++) {
2687 jint n = pending_signals[i];
2688 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2689 return i;
2690 }
2691 }
2692 if (!wait_for_signal) {
2693 return -1;
2694 }
2695 JavaThread *thread = JavaThread::current();
2696 ThreadBlockInVM tbivm(thread);
2697
2698 bool threadIsSuspended;
2699 do {
2700 thread->set_suspend_equivalent();
2701 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2702 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2703 ;
2704 assert(ret == 0, "sema_wait() failed");
2705
2706 // were we externally suspended while we were waiting?
2707 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2708 if (threadIsSuspended) {
2709 //
2710 // The semaphore has been incremented, but while we were waiting
2711 // another thread suspended us. We don't want to continue running
2712 // while suspended because that would surprise the thread that
2713 // suspended us.
2714 //
2715 ret = ::sema_post(&sig_sem);
2716 assert(ret == 0, "sema_post() failed");
2717
2718 thread->java_suspend_self();
2719 }
2720 } while (threadIsSuspended);
2721 }
2722 }
2723
2724 int os::signal_lookup() {
2725 return check_pending_signals(false);
2726 }
2727
2728 int os::signal_wait() {
2729 return check_pending_signals(true);
2730 }
2731
2732 ////////////////////////////////////////////////////////////////////////////////
2733 // Virtual Memory
2734
2735 static int page_size = -1;
2736
2737 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2738 // clear this var if support is not available.
2739 static bool has_map_align = true;
2740
2741 int os::vm_page_size() {
2742 assert(page_size != -1, "must call os::init");
2743 return page_size;
2744 }
2745
2746 // Solaris allocates memory by pages.
2747 int os::vm_allocation_granularity() {
2748 assert(page_size != -1, "must call os::init");
2749 return page_size;
2750 }
2751
2752 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2753 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2754 size_t size = bytes;
2755 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2756 if (res != NULL) {
2757 if (UseNUMAInterleaving) {
2758 numa_make_global(addr, bytes);
2759 }
2760 return true;
2761 }
2762 return false;
2763 }
2764
2765 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2766 bool exec) {
2767 if (commit_memory(addr, bytes, exec)) {
2768 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2769 // If the large page size has been set and the VM
2770 // is using large pages, use the large page size
2771 // if it is smaller than the alignment hint. This is
2772 // a case where the VM wants to use a larger alignment size
2773 // for its own reasons but still want to use large pages
2774 // (which is what matters to setting the mpss range.
2775 size_t page_size = 0;
2776 if (large_page_size() < alignment_hint) {
2777 assert(UseLargePages, "Expected to be here for large page use only");
2778 page_size = large_page_size();
2779 } else {
2780 // If the alignment hint is less than the large page
2781 // size, the VM wants a particular alignment (thus the hint)
2782 // for internal reasons. Try to set the mpss range using
2783 // the alignment_hint.
2784 page_size = alignment_hint;
2785 }
2786 // Since this is a hint, ignore any failures.
2787 (void)Solaris::set_mpss_range(addr, bytes, page_size);
2788 }
2789 return true;
2790 }
2791 return false;
2792 }
2793
2794 // Uncommit the pages in a specified region.
2795 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2796 if (madvise(addr, bytes, MADV_FREE) < 0) {
2797 debug_only(warning("MADV_FREE failed."));
2798 return;
2799 }
2800 }
2801
2802 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2803 return os::commit_memory(addr, size);
2804 }
2805
2806 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2807 return os::uncommit_memory(addr, size);
2808 }
2809
2810 // Change the page size in a given range.
2811 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2812 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2813 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2814 if (UseLargePages && UseMPSS) {
2815 Solaris::set_mpss_range(addr, bytes, alignment_hint);
2816 }
2817 }
2818
2819 // Tell the OS to make the range local to the first-touching LWP
2820 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2821 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2822 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2823 debug_only(warning("MADV_ACCESS_LWP failed."));
2824 }
2825 }
2826
2827 // Tell the OS that this range would be accessed from different LWPs.
2828 void os::numa_make_global(char *addr, size_t bytes) {
2829 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2830 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2831 debug_only(warning("MADV_ACCESS_MANY failed."));
2832 }
2833 }
2834
2835 // Get the number of the locality groups.
2836 size_t os::numa_get_groups_num() {
2837 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2838 return n != -1 ? n : 1;
2839 }
2840
2841 // Get a list of leaf locality groups. A leaf lgroup is group that
2842 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2843 // board. An LWP is assigned to one of these groups upon creation.
2844 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2845 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2846 ids[0] = 0;
2847 return 1;
2848 }
2849 int result_size = 0, top = 1, bottom = 0, cur = 0;
2850 for (int k = 0; k < size; k++) {
2851 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2852 (Solaris::lgrp_id_t*)&ids[top], size - top);
2853 if (r == -1) {
2854 ids[0] = 0;
2855 return 1;
2856 }
2857 if (!r) {
2858 // That's a leaf node.
2859 assert (bottom <= cur, "Sanity check");
2860 // Check if the node has memory
2861 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2862 NULL, 0, LGRP_RSRC_MEM) > 0) {
2863 ids[bottom++] = ids[cur];
2864 }
2865 }
2866 top += r;
2867 cur++;
2868 }
2869 if (bottom == 0) {
2870 // Handle a situation, when the OS reports no memory available.
2871 // Assume UMA architecture.
2872 ids[0] = 0;
2873 return 1;
2874 }
2875 return bottom;
2876 }
2877
2878 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2879 bool os::numa_topology_changed() {
2880 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2881 if (is_stale != -1 && is_stale) {
2882 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2883 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2884 assert(c != 0, "Failure to initialize LGRP API");
2885 Solaris::set_lgrp_cookie(c);
2886 return true;
2887 }
2888 return false;
2889 }
2890
2891 // Get the group id of the current LWP.
2892 int os::numa_get_group_id() {
2893 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2894 if (lgrp_id == -1) {
2895 return 0;
2896 }
2897 const int size = os::numa_get_groups_num();
2898 int *ids = (int*)alloca(size * sizeof(int));
2899
2900 // Get the ids of all lgroups with memory; r is the count.
2901 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2902 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2903 if (r <= 0) {
2904 return 0;
2905 }
2906 return ids[os::random() % r];
2907 }
2908
2909 // Request information about the page.
2910 bool os::get_page_info(char *start, page_info* info) {
2911 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2912 uint64_t addr = (uintptr_t)start;
2913 uint64_t outdata[2];
2914 uint_t validity = 0;
2915
2916 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2917 return false;
2918 }
2919
2920 info->size = 0;
2921 info->lgrp_id = -1;
2922
2923 if ((validity & 1) != 0) {
2924 if ((validity & 2) != 0) {
2925 info->lgrp_id = outdata[0];
2926 }
2927 if ((validity & 4) != 0) {
2928 info->size = outdata[1];
2929 }
2930 return true;
2931 }
2932 return false;
2933 }
2934
2935 // Scan the pages from start to end until a page different than
2936 // the one described in the info parameter is encountered.
2937 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2938 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2939 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2940 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2941 uint_t validity[MAX_MEMINFO_CNT];
2942
2943 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2944 uint64_t p = (uint64_t)start;
2945 while (p < (uint64_t)end) {
2946 addrs[0] = p;
2947 size_t addrs_count = 1;
2948 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) {
2949 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2950 addrs_count++;
2951 }
2952
2953 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2954 return NULL;
2955 }
2956
2957 size_t i = 0;
2958 for (; i < addrs_count; i++) {
2959 if ((validity[i] & 1) != 0) {
2960 if ((validity[i] & 4) != 0) {
2961 if (outdata[types * i + 1] != page_expected->size) {
2962 break;
2963 }
2964 } else
2965 if (page_expected->size != 0) {
2966 break;
2967 }
2968
2969 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2970 if (outdata[types * i] != page_expected->lgrp_id) {
2971 break;
2972 }
2973 }
2974 } else {
2975 return NULL;
2976 }
2977 }
2978
2979 if (i != addrs_count) {
2980 if ((validity[i] & 2) != 0) {
2981 page_found->lgrp_id = outdata[types * i];
2982 } else {
2983 page_found->lgrp_id = -1;
2984 }
2985 if ((validity[i] & 4) != 0) {
2986 page_found->size = outdata[types * i + 1];
2987 } else {
2988 page_found->size = 0;
2989 }
2990 return (char*)addrs[i];
2991 }
2992
2993 p = addrs[addrs_count - 1] + page_size;
2994 }
2995 return end;
2996 }
2997
2998 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2999 size_t size = bytes;
3000 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3001 // uncommitted page. Otherwise, the read/write might succeed if we
3002 // have enough swap space to back the physical page.
3003 return
3004 NULL != Solaris::mmap_chunk(addr, size,
3005 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
3006 PROT_NONE);
3007 }
3008
3009 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
3010 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
3011
3012 if (b == MAP_FAILED) {
3013 return NULL;
3014 }
3015 return b;
3016 }
3017
3018 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3019 char* addr = requested_addr;
3020 int flags = MAP_PRIVATE | MAP_NORESERVE;
3021
3022 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3023
3024 if (fixed) {
3025 flags |= MAP_FIXED;
3026 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3027 flags |= MAP_ALIGN;
3028 addr = (char*) alignment_hint;
3029 }
3030
3031 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3032 // uncommitted page. Otherwise, the read/write might succeed if we
3033 // have enough swap space to back the physical page.
3034 return mmap_chunk(addr, bytes, flags, PROT_NONE);
3035 }
3036
3037 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3038 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3039
3040 guarantee(requested_addr == NULL || requested_addr == addr,
3041 "OS failed to return requested mmap address.");
3042 return addr;
3043 }
3044
3045 // Reserve memory at an arbitrary address, only if that area is
3046 // available (and not reserved for something else).
3047
3048 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3049 const int max_tries = 10;
3050 char* base[max_tries];
3051 size_t size[max_tries];
3052
3053 // Solaris adds a gap between mmap'ed regions. The size of the gap
3054 // is dependent on the requested size and the MMU. Our initial gap
3055 // value here is just a guess and will be corrected later.
3056 bool had_top_overlap = false;
3057 bool have_adjusted_gap = false;
3058 size_t gap = 0x400000;
3059
3060 // Assert only that the size is a multiple of the page size, since
3061 // that's all that mmap requires, and since that's all we really know
3062 // about at this low abstraction level. If we need higher alignment,
3063 // we can either pass an alignment to this method or verify alignment
3064 // in one of the methods further up the call chain. See bug 5044738.
3065 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3066
3067 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3068 // Give it a try, if the kernel honors the hint we can return immediately.
3069 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3070
3071 volatile int err = errno;
3072 if (addr == requested_addr) {
3073 return addr;
3074 } else if (addr != NULL) {
3075 pd_unmap_memory(addr, bytes);
3076 }
3077
3078 if (PrintMiscellaneous && Verbose) {
3079 char buf[256];
3080 buf[0] = '\0';
3081 if (addr == NULL) {
3082 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3083 }
3084 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3085 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3086 "%s", bytes, requested_addr, addr, buf);
3087 }
3088
3089 // Address hint method didn't work. Fall back to the old method.
3090 // In theory, once SNV becomes our oldest supported platform, this
3091 // code will no longer be needed.
3092 //
3093 // Repeatedly allocate blocks until the block is allocated at the
3094 // right spot. Give up after max_tries.
3095 int i;
3096 for (i = 0; i < max_tries; ++i) {
3097 base[i] = reserve_memory(bytes);
3098
3099 if (base[i] != NULL) {
3100 // Is this the block we wanted?
3101 if (base[i] == requested_addr) {
3102 size[i] = bytes;
3103 break;
3104 }
3105
3106 // check that the gap value is right
3107 if (had_top_overlap && !have_adjusted_gap) {
3108 size_t actual_gap = base[i-1] - base[i] - bytes;
3109 if (gap != actual_gap) {
3110 // adjust the gap value and retry the last 2 allocations
3111 assert(i > 0, "gap adjustment code problem");
3112 have_adjusted_gap = true; // adjust the gap only once, just in case
3113 gap = actual_gap;
3114 if (PrintMiscellaneous && Verbose) {
3115 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3116 }
3117 unmap_memory(base[i], bytes);
3118 unmap_memory(base[i-1], size[i-1]);
3119 i-=2;
3120 continue;
3121 }
3122 }
3123
3124 // Does this overlap the block we wanted? Give back the overlapped
3125 // parts and try again.
3126 //
3127 // There is still a bug in this code: if top_overlap == bytes,
3128 // the overlap is offset from requested region by the value of gap.
3129 // In this case giving back the overlapped part will not work,
3130 // because we'll give back the entire block at base[i] and
3131 // therefore the subsequent allocation will not generate a new gap.
3132 // This could be fixed with a new algorithm that used larger
3133 // or variable size chunks to find the requested region -
3134 // but such a change would introduce additional complications.
3135 // It's rare enough that the planets align for this bug,
3136 // so we'll just wait for a fix for 6204603/5003415 which
3137 // will provide a mmap flag to allow us to avoid this business.
3138
3139 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3140 if (top_overlap >= 0 && top_overlap < bytes) {
3141 had_top_overlap = true;
3142 unmap_memory(base[i], top_overlap);
3143 base[i] += top_overlap;
3144 size[i] = bytes - top_overlap;
3145 } else {
3146 size_t bottom_overlap = base[i] + bytes - requested_addr;
3147 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3148 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3149 warning("attempt_reserve_memory_at: possible alignment bug");
3150 }
3151 unmap_memory(requested_addr, bottom_overlap);
3152 size[i] = bytes - bottom_overlap;
3153 } else {
3154 size[i] = bytes;
3155 }
3156 }
3157 }
3158 }
3159
3160 // Give back the unused reserved pieces.
3161
3162 for (int j = 0; j < i; ++j) {
3163 if (base[j] != NULL) {
3164 unmap_memory(base[j], size[j]);
3165 }
3166 }
3167
3168 return (i < max_tries) ? requested_addr : NULL;
3169 }
3170
3171 bool os::pd_release_memory(char* addr, size_t bytes) {
3172 size_t size = bytes;
3173 return munmap(addr, size) == 0;
3174 }
3175
3176 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3177 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3178 "addr must be page aligned");
3179 int retVal = mprotect(addr, bytes, prot);
3180 return retVal == 0;
3181 }
3182
3183 // Protect memory (Used to pass readonly pages through
3184 // JNI GetArray<type>Elements with empty arrays.)
3185 // Also, used for serialization page and for compressed oops null pointer
3186 // checking.
3187 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3188 bool is_committed) {
3189 unsigned int p = 0;
3190 switch (prot) {
3191 case MEM_PROT_NONE: p = PROT_NONE; break;
3192 case MEM_PROT_READ: p = PROT_READ; break;
3193 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3194 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3195 default:
3196 ShouldNotReachHere();
3197 }
3198 // is_committed is unused.
3199 return solaris_mprotect(addr, bytes, p);
3200 }
3201
3202 // guard_memory and unguard_memory only happens within stack guard pages.
3203 // Since ISM pertains only to the heap, guard and unguard memory should not
3204 /// happen with an ISM region.
3205 bool os::guard_memory(char* addr, size_t bytes) {
3206 return solaris_mprotect(addr, bytes, PROT_NONE);
3207 }
3208
3209 bool os::unguard_memory(char* addr, size_t bytes) {
3210 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3211 }
3212
3213 // Large page support
3214
3215 // UseLargePages is the master flag to enable/disable large page memory.
3216 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3217 // effects can be described in the following table:
3218 //
3219 // UseLargePages UseMPSS UseISM
3220 // false * * => UseLargePages is the master switch, turning
3221 // it off will turn off both UseMPSS and
3222 // UseISM. VM will not use large page memory
3223 // regardless the settings of UseMPSS/UseISM.
3224 // true false false => Unless future Solaris provides other
3225 // mechanism to use large page memory, this
3226 // combination is equivalent to -UseLargePages,
3227 // VM will not use large page memory
3228 // true true false => JVM will use MPSS for large page memory.
3229 // This is the default behavior.
3230 // true false true => JVM will use ISM for large page memory.
3231 // true true true => JVM will use ISM if it is available.
3232 // Otherwise, JVM will fall back to MPSS.
3233 // Becaues ISM is now available on all
3234 // supported Solaris versions, this combination
3235 // is equivalent to +UseISM -UseMPSS.
3236
3237 static size_t _large_page_size = 0;
3238
3239 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3240 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3241 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3242 // can support multiple page sizes.
3243
3244 // Don't bother to probe page size because getpagesizes() comes with MPSS.
3245 // ISM is only recommended on old Solaris where there is no MPSS support.
3246 // Simply choose a conservative value as default.
3247 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3248 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M)
3249 ARM_ONLY(2 * M);
3250
3251 // ISM is available on all supported Solaris versions
3252 return true;
3253 }
3254
3255 // Insertion sort for small arrays (descending order).
3256 static void insertion_sort_descending(size_t* array, int len) {
3257 for (int i = 0; i < len; i++) {
3258 size_t val = array[i];
3259 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3260 size_t tmp = array[key];
3261 array[key] = array[key - 1];
3262 array[key - 1] = tmp;
3263 }
3264 }
3265 }
3266
3267 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3268 const unsigned int usable_count = VM_Version::page_size_count();
3269 if (usable_count == 1) {
3270 return false;
3271 }
3272
3273 // Find the right getpagesizes interface. When solaris 11 is the minimum
3274 // build platform, getpagesizes() (without the '2') can be called directly.
3275 typedef int (*gps_t)(size_t[], int);
3276 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3277 if (gps_func == NULL) {
3278 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3279 if (gps_func == NULL) {
3280 if (warn) {
3281 warning("MPSS is not supported by the operating system.");
3282 }
3283 return false;
3284 }
3285 }
3286
3287 // Fill the array of page sizes.
3288 int n = (*gps_func)(_page_sizes, page_sizes_max);
3289 assert(n > 0, "Solaris bug?");
3290
3291 if (n == page_sizes_max) {
3292 // Add a sentinel value (necessary only if the array was completely filled
3293 // since it is static (zeroed at initialization)).
3294 _page_sizes[--n] = 0;
3295 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3296 }
3297 assert(_page_sizes[n] == 0, "missing sentinel");
3298 trace_page_sizes("available page sizes", _page_sizes, n);
3299
3300 if (n == 1) return false; // Only one page size available.
3301
3302 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3303 // select up to usable_count elements. First sort the array, find the first
3304 // acceptable value, then copy the usable sizes to the top of the array and
3305 // trim the rest. Make sure to include the default page size :-).
3306 //
3307 // A better policy could get rid of the 4M limit by taking the sizes of the
3308 // important VM memory regions (java heap and possibly the code cache) into
3309 // account.
3310 insertion_sort_descending(_page_sizes, n);
3311 const size_t size_limit =
3312 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3313 int beg;
3314 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3315 const int end = MIN2((int)usable_count, n) - 1;
3316 for (int cur = 0; cur < end; ++cur, ++beg) {
3317 _page_sizes[cur] = _page_sizes[beg];
3318 }
3319 _page_sizes[end] = vm_page_size();
3320 _page_sizes[end + 1] = 0;
3321
3322 if (_page_sizes[end] > _page_sizes[end - 1]) {
3323 // Default page size is not the smallest; sort again.
3324 insertion_sort_descending(_page_sizes, end + 1);
3325 }
3326 *page_size = _page_sizes[0];
3327
3328 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3329 return true;
3330 }
3331
3332 void os::large_page_init() {
3333 if (!UseLargePages) {
3334 UseISM = false;
3335 UseMPSS = false;
3336 return;
3337 }
3338
3339 // print a warning if any large page related flag is specified on command line
3340 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3341 !FLAG_IS_DEFAULT(UseISM) ||
3342 !FLAG_IS_DEFAULT(UseMPSS) ||
3343 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3344 UseISM = UseISM &&
3345 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3346 if (UseISM) {
3347 // ISM disables MPSS to be compatible with old JDK behavior
3348 UseMPSS = false;
3349 _page_sizes[0] = _large_page_size;
3350 _page_sizes[1] = vm_page_size();
3351 }
3352
3353 UseMPSS = UseMPSS &&
3354 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3355
3356 UseLargePages = UseISM || UseMPSS;
3357 }
3358
3359 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3360 // Signal to OS that we want large pages for addresses
3361 // from addr, addr + bytes
3362 struct memcntl_mha mpss_struct;
3363 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3364 mpss_struct.mha_pagesize = align;
3365 mpss_struct.mha_flags = 0;
3366 if (memcntl(start, bytes, MC_HAT_ADVISE,
3367 (caddr_t) &mpss_struct, 0, 0) < 0) {
3368 debug_only(warning("Attempt to use MPSS failed."));
3369 return false;
3370 }
3371 return true;
3372 }
3373
3374 char* os::reserve_memory_special(size_t size, char* addr, bool exec) {
3375 // "exec" is passed in but not used. Creating the shared image for
3376 // the code cache doesn't have an SHM_X executable permission to check.
3377 assert(UseLargePages && UseISM, "only for ISM large pages");
3378
3379 char* retAddr = NULL;
3380 int shmid;
3381 key_t ismKey;
3382
3383 bool warn_on_failure = UseISM &&
3384 (!FLAG_IS_DEFAULT(UseLargePages) ||
3385 !FLAG_IS_DEFAULT(UseISM) ||
3386 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3387 );
3388 char msg[128];
3389
3390 ismKey = IPC_PRIVATE;
3391
3392 // Create a large shared memory region to attach to based on size.
3393 // Currently, size is the total size of the heap
3394 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3395 if (shmid == -1){
3396 if (warn_on_failure) {
3397 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3398 warning(msg);
3399 }
3400 return NULL;
3401 }
3402
3403 // Attach to the region
3404 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3405 int err = errno;
3406
3407 // Remove shmid. If shmat() is successful, the actual shared memory segment
3408 // will be deleted when it's detached by shmdt() or when the process
3409 // terminates. If shmat() is not successful this will remove the shared
3410 // segment immediately.
3411 shmctl(shmid, IPC_RMID, NULL);
3412
3413 if (retAddr == (char *) -1) {
3414 if (warn_on_failure) {
3415 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3416 warning(msg);
3417 }
3418 return NULL;
3419 }
3420 if ((retAddr != NULL) && UseNUMAInterleaving) {
3421 numa_make_global(retAddr, size);
3422 }
3423 return retAddr;
3424 }
3425
3426 bool os::release_memory_special(char* base, size_t bytes) {
3427 // detaching the SHM segment will also delete it, see reserve_memory_special()
3428 int rslt = shmdt(base);
3429 return rslt == 0;
3430 }
3431
3432 size_t os::large_page_size() {
3433 return _large_page_size;
3434 }
3435
3436 // MPSS allows application to commit large page memory on demand; with ISM
3437 // the entire memory region must be allocated as shared memory.
3438 bool os::can_commit_large_page_memory() {
3439 return UseISM ? false : true;
3440 }
3441
3442 bool os::can_execute_large_page_memory() {
3443 return UseISM ? false : true;
3444 }
3445
3446 static int os_sleep(jlong millis, bool interruptible) {
3447 const jlong limit = INT_MAX;
3448 jlong prevtime;
3449 int res;
3450
3451 while (millis > limit) {
3452 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3453 return res;
3454 millis -= limit;
3455 }
3456
3457 // Restart interrupted polls with new parameters until the proper delay
3458 // has been completed.
3459
3460 prevtime = getTimeMillis();
3461
3462 while (millis > 0) {
3463 jlong newtime;
3464
3465 if (!interruptible) {
3466 // Following assert fails for os::yield_all:
3467 // assert(!thread->is_Java_thread(), "must not be java thread");
3468 res = poll(NULL, 0, millis);
3469 } else {
3470 JavaThread *jt = JavaThread::current();
3471
3472 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3473 os::Solaris::clear_interrupted);
3474 }
3475
3476 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3477 // thread.Interrupt.
3478
3479 // See c/r 6751923. Poll can return 0 before time
3480 // has elapsed if time is set via clock_settime (as NTP does).
3481 // res == 0 if poll timed out (see man poll RETURN VALUES)
3482 // using the logic below checks that we really did
3483 // sleep at least "millis" if not we'll sleep again.
3484 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3485 newtime = getTimeMillis();
3486 assert(newtime >= prevtime, "time moving backwards");
3487 /* Doing prevtime and newtime in microseconds doesn't help precision,
3488 and trying to round up to avoid lost milliseconds can result in a
3489 too-short delay. */
3490 millis -= newtime - prevtime;
3491 if(millis <= 0)
3492 return OS_OK;
3493 prevtime = newtime;
3494 } else
3495 return res;
3496 }
3497
3498 return OS_OK;
3499 }
3500
3501 // Read calls from inside the vm need to perform state transitions
3502 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3503 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3504 }
3505
3506 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3507 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3508 }
3509
3510 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3511 assert(thread == Thread::current(), "thread consistency check");
3512
3513 // TODO-FIXME: this should be removed.
3514 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3515 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3516 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3517 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3518 // is fooled into believing that the system is making progress. In the code below we block the
3519 // the watcher thread while safepoint is in progress so that it would not appear as though the
3520 // system is making progress.
3521 if (!Solaris::T2_libthread() &&
3522 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3523 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3524 // the entire safepoint, the watcher thread will line up here during the safepoint.
3525 Threads_lock->lock_without_safepoint_check();
3526 Threads_lock->unlock();
3527 }
3528
3529 if (thread->is_Java_thread()) {
3530 // This is a JavaThread so we honor the _thread_blocked protocol
3531 // even for sleeps of 0 milliseconds. This was originally done
3532 // as a workaround for bug 4338139. However, now we also do it
3533 // to honor the suspend-equivalent protocol.
3534
3535 JavaThread *jt = (JavaThread *) thread;
3536 ThreadBlockInVM tbivm(jt);
3537
3538 jt->set_suspend_equivalent();
3539 // cleared by handle_special_suspend_equivalent_condition() or
3540 // java_suspend_self() via check_and_wait_while_suspended()
3541
3542 int ret_code;
3543 if (millis <= 0) {
3544 thr_yield();
3545 ret_code = 0;
3546 } else {
3547 // The original sleep() implementation did not create an
3548 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3549 // I'm preserving that decision for now.
3550 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3551
3552 ret_code = os_sleep(millis, interruptible);
3553 }
3554
3555 // were we externally suspended while we were waiting?
3556 jt->check_and_wait_while_suspended();
3557
3558 return ret_code;
3559 }
3560
3561 // non-JavaThread from this point on:
3562
3563 if (millis <= 0) {
3564 thr_yield();
3565 return 0;
3566 }
3567
3568 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3569
3570 return os_sleep(millis, interruptible);
3571 }
3572
3573 int os::naked_sleep() {
3574 // %% make the sleep time an integer flag. for now use 1 millisec.
3575 return os_sleep(1, false);
3576 }
3577
3578 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3579 void os::infinite_sleep() {
3580 while (true) { // sleep forever ...
3581 ::sleep(100); // ... 100 seconds at a time
3582 }
3583 }
3584
3585 // Used to convert frequent JVM_Yield() to nops
3586 bool os::dont_yield() {
3587 if (DontYieldALot) {
3588 static hrtime_t last_time = 0;
3589 hrtime_t diff = getTimeNanos() - last_time;
3590
3591 if (diff < DontYieldALotInterval * 1000000)
3592 return true;
3593
3594 last_time += diff;
3595
3596 return false;
3597 }
3598 else {
3599 return false;
3600 }
3601 }
3602
3603 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3604 // the linux and win32 implementations do not. This should be checked.
3605
3606 void os::yield() {
3607 // Yields to all threads with same or greater priority
3608 os::sleep(Thread::current(), 0, false);
3609 }
3610
3611 // Note that yield semantics are defined by the scheduling class to which
3612 // the thread currently belongs. Typically, yield will _not yield to
3613 // other equal or higher priority threads that reside on the dispatch queues
3614 // of other CPUs.
3615
3616 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3617
3618
3619 // On Solaris we found that yield_all doesn't always yield to all other threads.
3620 // There have been cases where there is a thread ready to execute but it doesn't
3621 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3622 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3623 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3624 // number of times yield_all is called in the one loop and increase the sleep
3625 // time after 8 attempts. If this fails too we increase the concurrency level
3626 // so that the starving thread would get an lwp
3627
3628 void os::yield_all(int attempts) {
3629 // Yields to all threads, including threads with lower priorities
3630 if (attempts == 0) {
3631 os::sleep(Thread::current(), 1, false);
3632 } else {
3633 int iterations = attempts % 30;
3634 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3635 // thr_setconcurrency and _getconcurrency make sense only under T1.
3636 int noofLWPS = thr_getconcurrency();
3637 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3638 thr_setconcurrency(thr_getconcurrency() + 1);
3639 }
3640 } else if (iterations < 25) {
3641 os::sleep(Thread::current(), 1, false);
3642 } else {
3643 os::sleep(Thread::current(), 10, false);
3644 }
3645 }
3646 }
3647
3648 // Called from the tight loops to possibly influence time-sharing heuristics
3649 void os::loop_breaker(int attempts) {
3650 os::yield_all(attempts);
3651 }
3652
3653
3654 // Interface for setting lwp priorities. If we are using T2 libthread,
3655 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3656 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3657 // function is meaningless in this mode so we must adjust the real lwp's priority
3658 // The routines below implement the getting and setting of lwp priorities.
3659 //
3660 // Note: There are three priority scales used on Solaris. Java priotities
3661 // which range from 1 to 10, libthread "thr_setprio" scale which range
3662 // from 0 to 127, and the current scheduling class of the process we
3663 // are running in. This is typically from -60 to +60.
3664 // The setting of the lwp priorities in done after a call to thr_setprio
3665 // so Java priorities are mapped to libthread priorities and we map from
3666 // the latter to lwp priorities. We don't keep priorities stored in
3667 // Java priorities since some of our worker threads want to set priorities
3668 // higher than all Java threads.
3669 //
3670 // For related information:
3671 // (1) man -s 2 priocntl
3672 // (2) man -s 4 priocntl
3673 // (3) man dispadmin
3674 // = librt.so
3675 // = libthread/common/rtsched.c - thrp_setlwpprio().
3676 // = ps -cL <pid> ... to validate priority.
3677 // = sched_get_priority_min and _max
3678 // pthread_create
3679 // sched_setparam
3680 // pthread_setschedparam
3681 //
3682 // Assumptions:
3683 // + We assume that all threads in the process belong to the same
3684 // scheduling class. IE. an homogenous process.
3685 // + Must be root or in IA group to change change "interactive" attribute.
3686 // Priocntl() will fail silently. The only indication of failure is when
3687 // we read-back the value and notice that it hasn't changed.
3688 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3689 // + For RT, change timeslice as well. Invariant:
3690 // constant "priority integral"
3691 // Konst == TimeSlice * (60-Priority)
3692 // Given a priority, compute appropriate timeslice.
3693 // + Higher numerical values have higher priority.
3694
3695 // sched class attributes
3696 typedef struct {
3697 int schedPolicy; // classID
3698 int maxPrio;
3699 int minPrio;
3700 } SchedInfo;
3701
3702
3703 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3704
3705 #ifdef ASSERT
3706 static int ReadBackValidate = 1;
3707 #endif
3708 static int myClass = 0;
3709 static int myMin = 0;
3710 static int myMax = 0;
3711 static int myCur = 0;
3712 static bool priocntl_enable = false;
3713
3714 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3715 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3716
3717 // Call the version of priocntl suitable for all supported versions
3718 // of Solaris. We need to call through this wrapper so that we can
3719 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3720 //
3721 // This code should be removed if we ever stop supporting Solaris 8
3722 // and earlier releases.
3723
3724 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3725 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3726 static priocntl_type priocntl_ptr = priocntl_stub;
3727
3728 // Stub to set the value of the real pointer, and then call the real
3729 // function.
3730
3731 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3732 // Try Solaris 8- name only.
3733 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3734 guarantee(tmp != NULL, "priocntl function not found.");
3735 priocntl_ptr = tmp;
3736 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3737 }
3738
3739
3740 // lwp_priocntl_init
3741 //
3742 // Try to determine the priority scale for our process.
3743 //
3744 // Return errno or 0 if OK.
3745 //
3746 static
3747 int lwp_priocntl_init ()
3748 {
3749 int rslt;
3750 pcinfo_t ClassInfo;
3751 pcparms_t ParmInfo;
3752 int i;
3753
3754 if (!UseThreadPriorities) return 0;
3755
3756 // We are using Bound threads, we need to determine our priority ranges
3757 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3758 // If ThreadPriorityPolicy is 1, switch tables
3759 if (ThreadPriorityPolicy == 1) {
3760 for (i = 0 ; i < CriticalPriority+1; i++)
3761 os::java_to_os_priority[i] = prio_policy1[i];
3762 }
3763 if (UseCriticalJavaThreadPriority) {
3764 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3765 // See set_native_priority() and set_lwp_class_and_priority().
3766 // Save original MaxPriority mapping in case attempt to
3767 // use critical priority fails.
3768 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3769 // Set negative to distinguish from other priorities
3770 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3771 }
3772 }
3773 // Not using Bound Threads, set to ThreadPolicy 1
3774 else {
3775 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3776 os::java_to_os_priority[i] = prio_policy1[i];
3777 }
3778 return 0;
3779 }
3780
3781 // Get IDs for a set of well-known scheduling classes.
3782 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3783 // the system. We should have a loop that iterates over the
3784 // classID values, which are known to be "small" integers.
3785
3786 strcpy(ClassInfo.pc_clname, "TS");
3787 ClassInfo.pc_cid = -1;
3788 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3789 if (rslt < 0) return errno;
3790 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3791 tsLimits.schedPolicy = ClassInfo.pc_cid;
3792 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3793 tsLimits.minPrio = -tsLimits.maxPrio;
3794
3795 strcpy(ClassInfo.pc_clname, "IA");
3796 ClassInfo.pc_cid = -1;
3797 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3798 if (rslt < 0) return errno;
3799 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3800 iaLimits.schedPolicy = ClassInfo.pc_cid;
3801 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3802 iaLimits.minPrio = -iaLimits.maxPrio;
3803
3804 strcpy(ClassInfo.pc_clname, "RT");
3805 ClassInfo.pc_cid = -1;
3806 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3807 if (rslt < 0) return errno;
3808 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3809 rtLimits.schedPolicy = ClassInfo.pc_cid;
3810 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3811 rtLimits.minPrio = 0;
3812
3813 strcpy(ClassInfo.pc_clname, "FX");
3814 ClassInfo.pc_cid = -1;
3815 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3816 if (rslt < 0) return errno;
3817 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3818 fxLimits.schedPolicy = ClassInfo.pc_cid;
3819 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3820 fxLimits.minPrio = 0;
3821
3822 // Query our "current" scheduling class.
3823 // This will normally be IA, TS or, rarely, FX or RT.
3824 memset(&ParmInfo, 0, sizeof(ParmInfo));
3825 ParmInfo.pc_cid = PC_CLNULL;
3826 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3827 if (rslt < 0) return errno;
3828 myClass = ParmInfo.pc_cid;
3829
3830 // We now know our scheduling classId, get specific information
3831 // about the class.
3832 ClassInfo.pc_cid = myClass;
3833 ClassInfo.pc_clname[0] = 0;
3834 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3835 if (rslt < 0) return errno;
3836
3837 if (ThreadPriorityVerbose) {
3838 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3839 }
3840
3841 memset(&ParmInfo, 0, sizeof(pcparms_t));
3842 ParmInfo.pc_cid = PC_CLNULL;
3843 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3844 if (rslt < 0) return errno;
3845
3846 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3847 myMin = rtLimits.minPrio;
3848 myMax = rtLimits.maxPrio;
3849 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3850 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3851 myMin = iaLimits.minPrio;
3852 myMax = iaLimits.maxPrio;
3853 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3854 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3855 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3856 myMin = tsLimits.minPrio;
3857 myMax = tsLimits.maxPrio;
3858 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3859 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3860 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3861 myMin = fxLimits.minPrio;
3862 myMax = fxLimits.maxPrio;
3863 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3864 } else {
3865 // No clue - punt
3866 if (ThreadPriorityVerbose)
3867 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3868 return EINVAL; // no clue, punt
3869 }
3870
3871 if (ThreadPriorityVerbose) {
3872 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3873 }
3874
3875 priocntl_enable = true; // Enable changing priorities
3876 return 0;
3877 }
3878
3879 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3880 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3881 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3882 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3883
3884
3885 // scale_to_lwp_priority
3886 //
3887 // Convert from the libthread "thr_setprio" scale to our current
3888 // lwp scheduling class scale.
3889 //
3890 static
3891 int scale_to_lwp_priority (int rMin, int rMax, int x)
3892 {
3893 int v;
3894
3895 if (x == 127) return rMax; // avoid round-down
3896 v = (((x*(rMax-rMin)))/128)+rMin;
3897 return v;
3898 }
3899
3900
3901 // set_lwp_class_and_priority
3902 //
3903 // Set the class and priority of the lwp. This call should only
3904 // be made when using bound threads (T2 threads are bound by default).
3905 //
3906 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3907 int newPrio, int new_class, bool scale) {
3908 int rslt;
3909 int Actual, Expected, prv;
3910 pcparms_t ParmInfo; // for GET-SET
3911 #ifdef ASSERT
3912 pcparms_t ReadBack; // for readback
3913 #endif
3914
3915 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3916 // Query current values.
3917 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3918 // Cache "pcparms_t" in global ParmCache.
3919 // TODO: elide set-to-same-value
3920
3921 // If something went wrong on init, don't change priorities.
3922 if ( !priocntl_enable ) {
3923 if (ThreadPriorityVerbose)
3924 tty->print_cr("Trying to set priority but init failed, ignoring");
3925 return EINVAL;
3926 }
3927
3928 // If lwp hasn't started yet, just return
3929 // the _start routine will call us again.
3930 if ( lwpid <= 0 ) {
3931 if (ThreadPriorityVerbose) {
3932 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3933 INTPTR_FORMAT " to %d, lwpid not set",
3934 ThreadID, newPrio);
3935 }
3936 return 0;
3937 }
3938
3939 if (ThreadPriorityVerbose) {
3940 tty->print_cr ("set_lwp_class_and_priority("
3941 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3942 ThreadID, lwpid, newPrio);
3943 }
3944
3945 memset(&ParmInfo, 0, sizeof(pcparms_t));
3946 ParmInfo.pc_cid = PC_CLNULL;
3947 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3948 if (rslt < 0) return errno;
3949
3950 int cur_class = ParmInfo.pc_cid;
3951 ParmInfo.pc_cid = (id_t)new_class;
3952
3953 if (new_class == rtLimits.schedPolicy) {
3954 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3955 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3956 rtLimits.maxPrio, newPrio)
3957 : newPrio;
3958 rtInfo->rt_tqsecs = RT_NOCHANGE;
3959 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3960 if (ThreadPriorityVerbose) {
3961 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3962 }
3963 } else if (new_class == iaLimits.schedPolicy) {
3964 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3965 int maxClamped = MIN2(iaLimits.maxPrio,
3966 cur_class == new_class
3967 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3968 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3969 maxClamped, newPrio)
3970 : newPrio;
3971 iaInfo->ia_uprilim = cur_class == new_class
3972 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3973 iaInfo->ia_mode = IA_NOCHANGE;
3974 if (ThreadPriorityVerbose) {
3975 tty->print_cr("IA: [%d...%d] %d->%d\n",
3976 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3977 }
3978 } else if (new_class == tsLimits.schedPolicy) {
3979 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3980 int maxClamped = MIN2(tsLimits.maxPrio,
3981 cur_class == new_class
3982 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3983 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3984 maxClamped, newPrio)
3985 : newPrio;
3986 tsInfo->ts_uprilim = cur_class == new_class
3987 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3988 if (ThreadPriorityVerbose) {
3989 tty->print_cr("TS: [%d...%d] %d->%d\n",
3990 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3991 }
3992 } else if (new_class == fxLimits.schedPolicy) {
3993 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3994 int maxClamped = MIN2(fxLimits.maxPrio,
3995 cur_class == new_class
3996 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3997 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3998 maxClamped, newPrio)
3999 : newPrio;
4000 fxInfo->fx_uprilim = cur_class == new_class
4001 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
4002 fxInfo->fx_tqsecs = FX_NOCHANGE;
4003 fxInfo->fx_tqnsecs = FX_NOCHANGE;
4004 if (ThreadPriorityVerbose) {
4005 tty->print_cr("FX: [%d...%d] %d->%d\n",
4006 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
4007 }
4008 } else {
4009 if (ThreadPriorityVerbose) {
4010 tty->print_cr("Unknown new scheduling class %d\n", new_class);
4011 }
4012 return EINVAL; // no clue, punt
4013 }
4014
4015 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
4016 if (ThreadPriorityVerbose && rslt) {
4017 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
4018 }
4019 if (rslt < 0) return errno;
4020
4021 #ifdef ASSERT
4022 // Sanity check: read back what we just attempted to set.
4023 // In theory it could have changed in the interim ...
4024 //
4025 // The priocntl system call is tricky.
4026 // Sometimes it'll validate the priority value argument and
4027 // return EINVAL if unhappy. At other times it fails silently.
4028 // Readbacks are prudent.
4029
4030 if (!ReadBackValidate) return 0;
4031
4032 memset(&ReadBack, 0, sizeof(pcparms_t));
4033 ReadBack.pc_cid = PC_CLNULL;
4034 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
4035 assert(rslt >= 0, "priocntl failed");
4036 Actual = Expected = 0xBAD;
4037 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
4038 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
4039 Actual = RTPRI(ReadBack)->rt_pri;
4040 Expected = RTPRI(ParmInfo)->rt_pri;
4041 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
4042 Actual = IAPRI(ReadBack)->ia_upri;
4043 Expected = IAPRI(ParmInfo)->ia_upri;
4044 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
4045 Actual = TSPRI(ReadBack)->ts_upri;
4046 Expected = TSPRI(ParmInfo)->ts_upri;
4047 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
4048 Actual = FXPRI(ReadBack)->fx_upri;
4049 Expected = FXPRI(ParmInfo)->fx_upri;
4050 } else {
4051 if (ThreadPriorityVerbose) {
4052 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
4053 ParmInfo.pc_cid);
4054 }
4055 }
4056
4057 if (Actual != Expected) {
4058 if (ThreadPriorityVerbose) {
4059 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
4060 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
4061 }
4062 }
4063 #endif
4064
4065 return 0;
4066 }
4067
4068 // Solaris only gives access to 128 real priorities at a time,
4069 // so we expand Java's ten to fill this range. This would be better
4070 // if we dynamically adjusted relative priorities.
4071 //
4072 // The ThreadPriorityPolicy option allows us to select 2 different
4073 // priority scales.
4074 //
4075 // ThreadPriorityPolicy=0
4076 // Since the Solaris' default priority is MaximumPriority, we do not
4077 // set a priority lower than Max unless a priority lower than
4078 // NormPriority is requested.
4079 //
4080 // ThreadPriorityPolicy=1
4081 // This mode causes the priority table to get filled with
4082 // linear values. NormPriority get's mapped to 50% of the
4083 // Maximum priority an so on. This will cause VM threads
4084 // to get unfair treatment against other Solaris processes
4085 // which do not explicitly alter their thread priorities.
4086 //
4087
4088 int os::java_to_os_priority[CriticalPriority + 1] = {
4089 -99999, // 0 Entry should never be used
4090
4091 0, // 1 MinPriority
4092 32, // 2
4093 64, // 3
4094
4095 96, // 4
4096 127, // 5 NormPriority
4097 127, // 6
4098
4099 127, // 7
4100 127, // 8
4101 127, // 9 NearMaxPriority
4102
4103 127, // 10 MaxPriority
4104
4105 -criticalPrio // 11 CriticalPriority
4106 };
4107
4108 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4109 OSThread* osthread = thread->osthread();
4110
4111 // Save requested priority in case the thread hasn't been started
4112 osthread->set_native_priority(newpri);
4113
4114 // Check for critical priority request
4115 bool fxcritical = false;
4116 if (newpri == -criticalPrio) {
4117 fxcritical = true;
4118 newpri = criticalPrio;
4119 }
4120
4121 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4122 if (!UseThreadPriorities) return OS_OK;
4123
4124 int status = 0;
4125
4126 if (!fxcritical) {
4127 // Use thr_setprio only if we have a priority that thr_setprio understands
4128 status = thr_setprio(thread->osthread()->thread_id(), newpri);
4129 }
4130
4131 if (os::Solaris::T2_libthread() ||
4132 (UseBoundThreads && osthread->is_vm_created())) {
4133 int lwp_status =
4134 set_lwp_class_and_priority(osthread->thread_id(),
4135 osthread->lwp_id(),
4136 newpri,
4137 fxcritical ? fxLimits.schedPolicy : myClass,
4138 !fxcritical);
4139 if (lwp_status != 0 && fxcritical) {
4140 // Try again, this time without changing the scheduling class
4141 newpri = java_MaxPriority_to_os_priority;
4142 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
4143 osthread->lwp_id(),
4144 newpri, myClass, false);
4145 }
4146 status |= lwp_status;
4147 }
4148 return (status == 0) ? OS_OK : OS_ERR;
4149 }
4150
4151
4152 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4153 int p;
4154 if ( !UseThreadPriorities ) {
4155 *priority_ptr = NormalPriority;
4156 return OS_OK;
4157 }
4158 int status = thr_getprio(thread->osthread()->thread_id(), &p);
4159 if (status != 0) {
4160 return OS_ERR;
4161 }
4162 *priority_ptr = p;
4163 return OS_OK;
4164 }
4165
4166
4167 // Hint to the underlying OS that a task switch would not be good.
4168 // Void return because it's a hint and can fail.
4169 void os::hint_no_preempt() {
4170 schedctl_start(schedctl_init());
4171 }
4172
4173 void os::interrupt(Thread* thread) {
4174 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4175
4176 OSThread* osthread = thread->osthread();
4177
4178 int isInterrupted = osthread->interrupted();
4179 if (!isInterrupted) {
4180 osthread->set_interrupted(true);
4181 OrderAccess::fence();
4182 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4183 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4184 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4185 ParkEvent * const slp = thread->_SleepEvent ;
4186 if (slp != NULL) slp->unpark() ;
4187 }
4188
4189 // For JSR166: unpark after setting status but before thr_kill -dl
4190 if (thread->is_Java_thread()) {
4191 ((JavaThread*)thread)->parker()->unpark();
4192 }
4193
4194 // Handle interruptible wait() ...
4195 ParkEvent * const ev = thread->_ParkEvent ;
4196 if (ev != NULL) ev->unpark() ;
4197
4198 // When events are used everywhere for os::sleep, then this thr_kill
4199 // will only be needed if UseVMInterruptibleIO is true.
4200
4201 if (!isInterrupted) {
4202 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4203 assert_status(status == 0, status, "thr_kill");
4204
4205 // Bump thread interruption counter
4206 RuntimeService::record_thread_interrupt_signaled_count();
4207 }
4208 }
4209
4210
4211 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4212 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4213
4214 OSThread* osthread = thread->osthread();
4215
4216 bool res = osthread->interrupted();
4217
4218 // NOTE that since there is no "lock" around these two operations,
4219 // there is the possibility that the interrupted flag will be
4220 // "false" but that the interrupt event will be set. This is
4221 // intentional. The effect of this is that Object.wait() will appear
4222 // to have a spurious wakeup, which is not harmful, and the
4223 // possibility is so rare that it is not worth the added complexity
4224 // to add yet another lock. It has also been recommended not to put
4225 // the interrupted flag into the os::Solaris::Event structure,
4226 // because it hides the issue.
4227 if (res && clear_interrupted) {
4228 osthread->set_interrupted(false);
4229 }
4230 return res;
4231 }
4232
4233
4234 void os::print_statistics() {
4235 }
4236
4237 int os::message_box(const char* title, const char* message) {
4238 int i;
4239 fdStream err(defaultStream::error_fd());
4240 for (i = 0; i < 78; i++) err.print_raw("=");
4241 err.cr();
4242 err.print_raw_cr(title);
4243 for (i = 0; i < 78; i++) err.print_raw("-");
4244 err.cr();
4245 err.print_raw_cr(message);
4246 for (i = 0; i < 78; i++) err.print_raw("=");
4247 err.cr();
4248
4249 char buf[16];
4250 // Prevent process from exiting upon "read error" without consuming all CPU
4251 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4252
4253 return buf[0] == 'y' || buf[0] == 'Y';
4254 }
4255
4256 // A lightweight implementation that does not suspend the target thread and
4257 // thus returns only a hint. Used for profiling only!
4258 ExtendedPC os::get_thread_pc(Thread* thread) {
4259 // Make sure that it is called by the watcher and the Threads lock is owned.
4260 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4261 // For now, is only used to profile the VM Thread
4262 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4263 ExtendedPC epc;
4264
4265 GetThreadPC_Callback cb(ProfileVM_lock);
4266 OSThread *osthread = thread->osthread();
4267 const int time_to_wait = 400; // 400ms wait for initial response
4268 int status = cb.interrupt(thread, time_to_wait);
4269
4270 if (cb.is_done() ) {
4271 epc = cb.addr();
4272 } else {
4273 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4274 osthread->thread_id(), status););
4275 // epc is already NULL
4276 }
4277 return epc;
4278 }
4279
4280
4281 // This does not do anything on Solaris. This is basically a hook for being
4282 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4283 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4284 f(value, method, args, thread);
4285 }
4286
4287 // This routine may be used by user applications as a "hook" to catch signals.
4288 // The user-defined signal handler must pass unrecognized signals to this
4289 // routine, and if it returns true (non-zero), then the signal handler must
4290 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4291 // routine will never retun false (zero), but instead will execute a VM panic
4292 // routine kill the process.
4293 //
4294 // If this routine returns false, it is OK to call it again. This allows
4295 // the user-defined signal handler to perform checks either before or after
4296 // the VM performs its own checks. Naturally, the user code would be making
4297 // a serious error if it tried to handle an exception (such as a null check
4298 // or breakpoint) that the VM was generating for its own correct operation.
4299 //
4300 // This routine may recognize any of the following kinds of signals:
4301 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4302 // os::Solaris::SIGasync
4303 // It should be consulted by handlers for any of those signals.
4304 // It explicitly does not recognize os::Solaris::SIGinterrupt
4305 //
4306 // The caller of this routine must pass in the three arguments supplied
4307 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4308 // field of the structure passed to sigaction(). This routine assumes that
4309 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4310 //
4311 // Note that the VM will print warnings if it detects conflicting signal
4312 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4313 //
4314 extern "C" JNIEXPORT int
4315 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4316 int abort_if_unrecognized);
4317
4318
4319 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4320 int orig_errno = errno; // Preserve errno value over signal handler.
4321 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4322 errno = orig_errno;
4323 }
4324
4325 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4326 is needed to provoke threads blocked on IO to return an EINTR
4327 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4328 does NOT participate in signal chaining due to requirement for
4329 NOT setting SA_RESTART to make EINTR work. */
4330 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4331 if (UseSignalChaining) {
4332 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4333 if (actp && actp->sa_handler) {
4334 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4335 }
4336 }
4337 }
4338
4339 // This boolean allows users to forward their own non-matching signals
4340 // to JVM_handle_solaris_signal, harmlessly.
4341 bool os::Solaris::signal_handlers_are_installed = false;
4342
4343 // For signal-chaining
4344 bool os::Solaris::libjsig_is_loaded = false;
4345 typedef struct sigaction *(*get_signal_t)(int);
4346 get_signal_t os::Solaris::get_signal_action = NULL;
4347
4348 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4349 struct sigaction *actp = NULL;
4350
4351 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4352 // Retrieve the old signal handler from libjsig
4353 actp = (*get_signal_action)(sig);
4354 }
4355 if (actp == NULL) {
4356 // Retrieve the preinstalled signal handler from jvm
4357 actp = get_preinstalled_handler(sig);
4358 }
4359
4360 return actp;
4361 }
4362
4363 static bool call_chained_handler(struct sigaction *actp, int sig,
4364 siginfo_t *siginfo, void *context) {
4365 // Call the old signal handler
4366 if (actp->sa_handler == SIG_DFL) {
4367 // It's more reasonable to let jvm treat it as an unexpected exception
4368 // instead of taking the default action.
4369 return false;
4370 } else if (actp->sa_handler != SIG_IGN) {
4371 if ((actp->sa_flags & SA_NODEFER) == 0) {
4372 // automaticlly block the signal
4373 sigaddset(&(actp->sa_mask), sig);
4374 }
4375
4376 sa_handler_t hand;
4377 sa_sigaction_t sa;
4378 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4379 // retrieve the chained handler
4380 if (siginfo_flag_set) {
4381 sa = actp->sa_sigaction;
4382 } else {
4383 hand = actp->sa_handler;
4384 }
4385
4386 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4387 actp->sa_handler = SIG_DFL;
4388 }
4389
4390 // try to honor the signal mask
4391 sigset_t oset;
4392 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4393
4394 // call into the chained handler
4395 if (siginfo_flag_set) {
4396 (*sa)(sig, siginfo, context);
4397 } else {
4398 (*hand)(sig);
4399 }
4400
4401 // restore the signal mask
4402 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4403 }
4404 // Tell jvm's signal handler the signal is taken care of.
4405 return true;
4406 }
4407
4408 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4409 bool chained = false;
4410 // signal-chaining
4411 if (UseSignalChaining) {
4412 struct sigaction *actp = get_chained_signal_action(sig);
4413 if (actp != NULL) {
4414 chained = call_chained_handler(actp, sig, siginfo, context);
4415 }
4416 }
4417 return chained;
4418 }
4419
4420 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4421 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4422 if (preinstalled_sigs[sig] != 0) {
4423 return &chainedsigactions[sig];
4424 }
4425 return NULL;
4426 }
4427
4428 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4429
4430 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4431 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4432 chainedsigactions[sig] = oldAct;
4433 preinstalled_sigs[sig] = 1;
4434 }
4435
4436 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4437 // Check for overwrite.
4438 struct sigaction oldAct;
4439 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4440 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4441 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4442 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4443 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4444 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4445 if (AllowUserSignalHandlers || !set_installed) {
4446 // Do not overwrite; user takes responsibility to forward to us.
4447 return;
4448 } else if (UseSignalChaining) {
4449 if (oktochain) {
4450 // save the old handler in jvm
4451 save_preinstalled_handler(sig, oldAct);
4452 } else {
4453 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4454 }
4455 // libjsig also interposes the sigaction() call below and saves the
4456 // old sigaction on it own.
4457 } else {
4458 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4459 "%#lx for signal %d.", (long)oldhand, sig));
4460 }
4461 }
4462
4463 struct sigaction sigAct;
4464 sigfillset(&(sigAct.sa_mask));
4465 sigAct.sa_handler = SIG_DFL;
4466
4467 sigAct.sa_sigaction = signalHandler;
4468 // Handle SIGSEGV on alternate signal stack if
4469 // not using stack banging
4470 if (!UseStackBanging && sig == SIGSEGV) {
4471 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4472 // Interruptible i/o requires SA_RESTART cleared so EINTR
4473 // is returned instead of restarting system calls
4474 } else if (sig == os::Solaris::SIGinterrupt()) {
4475 sigemptyset(&sigAct.sa_mask);
4476 sigAct.sa_handler = NULL;
4477 sigAct.sa_flags = SA_SIGINFO;
4478 sigAct.sa_sigaction = sigINTRHandler;
4479 } else {
4480 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4481 }
4482 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4483
4484 sigaction(sig, &sigAct, &oldAct);
4485
4486 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4487 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4488 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4489 }
4490
4491
4492 #define DO_SIGNAL_CHECK(sig) \
4493 if (!sigismember(&check_signal_done, sig)) \
4494 os::Solaris::check_signal_handler(sig)
4495
4496 // This method is a periodic task to check for misbehaving JNI applications
4497 // under CheckJNI, we can add any periodic checks here
4498
4499 void os::run_periodic_checks() {
4500 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4501 // thereby preventing a NULL checks.
4502 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4503
4504 if (check_signals == false) return;
4505
4506 // SEGV and BUS if overridden could potentially prevent
4507 // generation of hs*.log in the event of a crash, debugging
4508 // such a case can be very challenging, so we absolutely
4509 // check for the following for a good measure:
4510 DO_SIGNAL_CHECK(SIGSEGV);
4511 DO_SIGNAL_CHECK(SIGILL);
4512 DO_SIGNAL_CHECK(SIGFPE);
4513 DO_SIGNAL_CHECK(SIGBUS);
4514 DO_SIGNAL_CHECK(SIGPIPE);
4515 DO_SIGNAL_CHECK(SIGXFSZ);
4516
4517 // ReduceSignalUsage allows the user to override these handlers
4518 // see comments at the very top and jvm_solaris.h
4519 if (!ReduceSignalUsage) {
4520 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4521 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4522 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4523 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4524 }
4525
4526 // See comments above for using JVM1/JVM2 and UseAltSigs
4527 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4528 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4529
4530 }
4531
4532 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4533
4534 static os_sigaction_t os_sigaction = NULL;
4535
4536 void os::Solaris::check_signal_handler(int sig) {
4537 char buf[O_BUFLEN];
4538 address jvmHandler = NULL;
4539
4540 struct sigaction act;
4541 if (os_sigaction == NULL) {
4542 // only trust the default sigaction, in case it has been interposed
4543 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4544 if (os_sigaction == NULL) return;
4545 }
4546
4547 os_sigaction(sig, (struct sigaction*)NULL, &act);
4548
4549 address thisHandler = (act.sa_flags & SA_SIGINFO)
4550 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4551 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4552
4553
4554 switch(sig) {
4555 case SIGSEGV:
4556 case SIGBUS:
4557 case SIGFPE:
4558 case SIGPIPE:
4559 case SIGXFSZ:
4560 case SIGILL:
4561 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4562 break;
4563
4564 case SHUTDOWN1_SIGNAL:
4565 case SHUTDOWN2_SIGNAL:
4566 case SHUTDOWN3_SIGNAL:
4567 case BREAK_SIGNAL:
4568 jvmHandler = (address)user_handler();
4569 break;
4570
4571 default:
4572 int intrsig = os::Solaris::SIGinterrupt();
4573 int asynsig = os::Solaris::SIGasync();
4574
4575 if (sig == intrsig) {
4576 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4577 } else if (sig == asynsig) {
4578 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4579 } else {
4580 return;
4581 }
4582 break;
4583 }
4584
4585
4586 if (thisHandler != jvmHandler) {
4587 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4588 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4589 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4590 // No need to check this sig any longer
4591 sigaddset(&check_signal_done, sig);
4592 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4593 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4594 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4595 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4596 // No need to check this sig any longer
4597 sigaddset(&check_signal_done, sig);
4598 }
4599
4600 // Print all the signal handler state
4601 if (sigismember(&check_signal_done, sig)) {
4602 print_signal_handlers(tty, buf, O_BUFLEN);
4603 }
4604
4605 }
4606
4607 void os::Solaris::install_signal_handlers() {
4608 bool libjsigdone = false;
4609 signal_handlers_are_installed = true;
4610
4611 // signal-chaining
4612 typedef void (*signal_setting_t)();
4613 signal_setting_t begin_signal_setting = NULL;
4614 signal_setting_t end_signal_setting = NULL;
4615 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4616 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4617 if (begin_signal_setting != NULL) {
4618 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4619 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4620 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4621 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4622 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4623 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4624 libjsig_is_loaded = true;
4625 if (os::Solaris::get_libjsig_version != NULL) {
4626 libjsigversion = (*os::Solaris::get_libjsig_version)();
4627 }
4628 assert(UseSignalChaining, "should enable signal-chaining");
4629 }
4630 if (libjsig_is_loaded) {
4631 // Tell libjsig jvm is setting signal handlers
4632 (*begin_signal_setting)();
4633 }
4634
4635 set_signal_handler(SIGSEGV, true, true);
4636 set_signal_handler(SIGPIPE, true, true);
4637 set_signal_handler(SIGXFSZ, true, true);
4638 set_signal_handler(SIGBUS, true, true);
4639 set_signal_handler(SIGILL, true, true);
4640 set_signal_handler(SIGFPE, true, true);
4641
4642
4643 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4644
4645 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4646 // can not register overridable signals which might be > 32
4647 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4648 // Tell libjsig jvm has finished setting signal handlers
4649 (*end_signal_setting)();
4650 libjsigdone = true;
4651 }
4652 }
4653
4654 // Never ok to chain our SIGinterrupt
4655 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4656 set_signal_handler(os::Solaris::SIGasync(), true, true);
4657
4658 if (libjsig_is_loaded && !libjsigdone) {
4659 // Tell libjsig jvm finishes setting signal handlers
4660 (*end_signal_setting)();
4661 }
4662
4663 // We don't activate signal checker if libjsig is in place, we trust ourselves
4664 // and if UserSignalHandler is installed all bets are off.
4665 // Log that signal checking is off only if -verbose:jni is specified.
4666 if (CheckJNICalls) {
4667 if (libjsig_is_loaded) {
4668 if (PrintJNIResolving) {
4669 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4670 }
4671 check_signals = false;
4672 }
4673 if (AllowUserSignalHandlers) {
4674 if (PrintJNIResolving) {
4675 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4676 }
4677 check_signals = false;
4678 }
4679 }
4680 }
4681
4682
4683 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4684
4685 const char * signames[] = {
4686 "SIG0",
4687 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4688 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4689 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4690 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4691 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4692 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4693 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4694 "SIGCANCEL", "SIGLOST"
4695 };
4696
4697 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4698 if (0 < exception_code && exception_code <= SIGRTMAX) {
4699 // signal
4700 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4701 jio_snprintf(buf, size, "%s", signames[exception_code]);
4702 } else {
4703 jio_snprintf(buf, size, "SIG%d", exception_code);
4704 }
4705 return buf;
4706 } else {
4707 return NULL;
4708 }
4709 }
4710
4711 // (Static) wrappers for the new libthread API
4712 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4713 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4714 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4715 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4716 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4717
4718 // (Static) wrapper for getisax(2) call.
4719 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4720
4721 // (Static) wrappers for the liblgrp API
4722 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4723 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4724 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4725 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4726 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4727 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4728 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4729 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4730 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4731
4732 // (Static) wrapper for meminfo() call.
4733 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4734
4735 static address resolve_symbol_lazy(const char* name) {
4736 address addr = (address) dlsym(RTLD_DEFAULT, name);
4737 if(addr == NULL) {
4738 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4739 addr = (address) dlsym(RTLD_NEXT, name);
4740 }
4741 return addr;
4742 }
4743
4744 static address resolve_symbol(const char* name) {
4745 address addr = resolve_symbol_lazy(name);
4746 if(addr == NULL) {
4747 fatal(dlerror());
4748 }
4749 return addr;
4750 }
4751
4752
4753
4754 // isT2_libthread()
4755 //
4756 // Routine to determine if we are currently using the new T2 libthread.
4757 //
4758 // We determine if we are using T2 by reading /proc/self/lstatus and
4759 // looking for a thread with the ASLWP bit set. If we find this status
4760 // bit set, we must assume that we are NOT using T2. The T2 team
4761 // has approved this algorithm.
4762 //
4763 // We need to determine if we are running with the new T2 libthread
4764 // since setting native thread priorities is handled differently
4765 // when using this library. All threads created using T2 are bound
4766 // threads. Calling thr_setprio is meaningless in this case.
4767 //
4768 bool isT2_libthread() {
4769 static prheader_t * lwpArray = NULL;
4770 static int lwpSize = 0;
4771 static int lwpFile = -1;
4772 lwpstatus_t * that;
4773 char lwpName [128];
4774 bool isT2 = false;
4775
4776 #define ADR(x) ((uintptr_t)(x))
4777 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4778
4779 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4780 if (lwpFile < 0) {
4781 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4782 return false;
4783 }
4784 lwpSize = 16*1024;
4785 for (;;) {
4786 ::lseek64 (lwpFile, 0, SEEK_SET);
4787 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4788 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4789 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4790 break;
4791 }
4792 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4793 // We got a good snapshot - now iterate over the list.
4794 int aslwpcount = 0;
4795 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4796 that = LWPINDEX(lwpArray,i);
4797 if (that->pr_flags & PR_ASLWP) {
4798 aslwpcount++;
4799 }
4800 }
4801 if (aslwpcount == 0) isT2 = true;
4802 break;
4803 }
4804 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4805 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4806 }
4807
4808 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4809 ::close (lwpFile);
4810 if (ThreadPriorityVerbose) {
4811 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4812 else tty->print_cr("We are not running with a T2 libthread\n");
4813 }
4814 return isT2;
4815 }
4816
4817
4818 void os::Solaris::libthread_init() {
4819 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4820
4821 // Determine if we are running with the new T2 libthread
4822 os::Solaris::set_T2_libthread(isT2_libthread());
4823
4824 lwp_priocntl_init();
4825
4826 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4827 if(func == NULL) {
4828 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4829 // Guarantee that this VM is running on an new enough OS (5.6 or
4830 // later) that it will have a new enough libthread.so.
4831 guarantee(func != NULL, "libthread.so is too old.");
4832 }
4833
4834 // Initialize the new libthread getstate API wrappers
4835 func = resolve_symbol("thr_getstate");
4836 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4837
4838 func = resolve_symbol("thr_setstate");
4839 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4840
4841 func = resolve_symbol("thr_setmutator");
4842 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4843
4844 func = resolve_symbol("thr_suspend_mutator");
4845 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4846
4847 func = resolve_symbol("thr_continue_mutator");
4848 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4849
4850 int size;
4851 void (*handler_info_func)(address *, int *);
4852 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4853 handler_info_func(&handler_start, &size);
4854 handler_end = handler_start + size;
4855 }
4856
4857
4858 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4859 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4860 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4861 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4862 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4863 int os::Solaris::_mutex_scope = USYNC_THREAD;
4864
4865 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4866 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4867 int_fnP_cond_tP os::Solaris::_cond_signal;
4868 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4869 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4870 int_fnP_cond_tP os::Solaris::_cond_destroy;
4871 int os::Solaris::_cond_scope = USYNC_THREAD;
4872
4873 void os::Solaris::synchronization_init() {
4874 if(UseLWPSynchronization) {
4875 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4876 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4877 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4878 os::Solaris::set_mutex_init(lwp_mutex_init);
4879 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4880 os::Solaris::set_mutex_scope(USYNC_THREAD);
4881
4882 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4883 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4884 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4885 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4886 os::Solaris::set_cond_init(lwp_cond_init);
4887 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4888 os::Solaris::set_cond_scope(USYNC_THREAD);
4889 }
4890 else {
4891 os::Solaris::set_mutex_scope(USYNC_THREAD);
4892 os::Solaris::set_cond_scope(USYNC_THREAD);
4893
4894 if(UsePthreads) {
4895 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4896 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4897 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4898 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4899 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4900
4901 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4902 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4903 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4904 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4905 os::Solaris::set_cond_init(pthread_cond_default_init);
4906 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4907 }
4908 else {
4909 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4910 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4911 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4912 os::Solaris::set_mutex_init(::mutex_init);
4913 os::Solaris::set_mutex_destroy(::mutex_destroy);
4914
4915 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4916 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4917 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4918 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4919 os::Solaris::set_cond_init(::cond_init);
4920 os::Solaris::set_cond_destroy(::cond_destroy);
4921 }
4922 }
4923 }
4924
4925 bool os::Solaris::liblgrp_init() {
4926 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4927 if (handle != NULL) {
4928 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4929 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4930 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4931 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4932 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4933 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4934 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4935 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4936 dlsym(handle, "lgrp_cookie_stale")));
4937
4938 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4939 set_lgrp_cookie(c);
4940 return true;
4941 }
4942 return false;
4943 }
4944
4945 void os::Solaris::misc_sym_init() {
4946 address func;
4947
4948 // getisax
4949 func = resolve_symbol_lazy("getisax");
4950 if (func != NULL) {
4951 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4952 }
4953
4954 // meminfo
4955 func = resolve_symbol_lazy("meminfo");
4956 if (func != NULL) {
4957 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4958 }
4959 }
4960
4961 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4962 assert(_getisax != NULL, "_getisax not set");
4963 return _getisax(array, n);
4964 }
4965
4966 // Symbol doesn't exist in Solaris 8 pset.h
4967 #ifndef PS_MYID
4968 #define PS_MYID -3
4969 #endif
4970
4971 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4972 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4973 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4974
4975 void init_pset_getloadavg_ptr(void) {
4976 pset_getloadavg_ptr =
4977 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4978 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4979 warning("pset_getloadavg function not found");
4980 }
4981 }
4982
4983 int os::Solaris::_dev_zero_fd = -1;
4984
4985 // this is called _before_ the global arguments have been parsed
4986 void os::init(void) {
4987 _initial_pid = getpid();
4988
4989 max_hrtime = first_hrtime = gethrtime();
4990
4991 init_random(1234567);
4992
4993 page_size = sysconf(_SC_PAGESIZE);
4994 if (page_size == -1)
4995 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4996 strerror(errno)));
4997 init_page_sizes((size_t) page_size);
4998
4999 Solaris::initialize_system_info();
5000
5001 // Initialize misc. symbols as soon as possible, so we can use them
5002 // if we need them.
5003 Solaris::misc_sym_init();
5004
5005 int fd = ::open("/dev/zero", O_RDWR);
5006 if (fd < 0) {
5007 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
5008 } else {
5009 Solaris::set_dev_zero_fd(fd);
5010
5011 // Close on exec, child won't inherit.
5012 fcntl(fd, F_SETFD, FD_CLOEXEC);
5013 }
5014
5015 clock_tics_per_sec = CLK_TCK;
5016
5017 // check if dladdr1() exists; dladdr1 can provide more information than
5018 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
5019 // and is available on linker patches for 5.7 and 5.8.
5020 // libdl.so must have been loaded, this call is just an entry lookup
5021 void * hdl = dlopen("libdl.so", RTLD_NOW);
5022 if (hdl)
5023 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
5024
5025 // (Solaris only) this switches to calls that actually do locking.
5026 ThreadCritical::initialize();
5027
5028 main_thread = thr_self();
5029
5030 // Constant minimum stack size allowed. It must be at least
5031 // the minimum of what the OS supports (thr_min_stack()), and
5032 // enough to allow the thread to get to user bytecode execution.
5033 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
5034 // If the pagesize of the VM is greater than 8K determine the appropriate
5035 // number of initial guard pages. The user can change this with the
5036 // command line arguments, if needed.
5037 if (vm_page_size() > 8*K) {
5038 StackYellowPages = 1;
5039 StackRedPages = 1;
5040 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
5041 }
5042 }
5043
5044 // To install functions for atexit system call
5045 extern "C" {
5046 static void perfMemory_exit_helper() {
5047 perfMemory_exit();
5048 }
5049 }
5050
5051 // this is called _after_ the global arguments have been parsed
5052 jint os::init_2(void) {
5053 // try to enable extended file IO ASAP, see 6431278
5054 os::Solaris::try_enable_extended_io();
5055
5056 // Allocate a single page and mark it as readable for safepoint polling. Also
5057 // use this first mmap call to check support for MAP_ALIGN.
5058 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
5059 page_size,
5060 MAP_PRIVATE | MAP_ALIGN,
5061 PROT_READ);
5062 if (polling_page == NULL) {
5063 has_map_align = false;
5064 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
5065 PROT_READ);
5066 }
5067
5068 os::set_polling_page(polling_page);
5069
5070 #ifndef PRODUCT
5071 if( Verbose && PrintMiscellaneous )
5072 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
5073 #endif
5074
5075 if (!UseMembar) {
5076 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
5077 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
5078 os::set_memory_serialize_page( mem_serialize_page );
5079
5080 #ifndef PRODUCT
5081 if(Verbose && PrintMiscellaneous)
5082 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
5083 #endif
5084 }
5085
5086 os::large_page_init();
5087
5088 // Check minimum allowable stack size for thread creation and to initialize
5089 // the java system classes, including StackOverflowError - depends on page
5090 // size. Add a page for compiler2 recursion in main thread.
5091 // Add in 2*BytesPerWord times page size to account for VM stack during
5092 // class initialization depending on 32 or 64 bit VM.
5093 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5094 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5095 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5096
5097 size_t threadStackSizeInBytes = ThreadStackSize * K;
5098 if (threadStackSizeInBytes != 0 &&
5099 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5100 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5101 os::Solaris::min_stack_allowed/K);
5102 return JNI_ERR;
5103 }
5104
5105 // For 64kbps there will be a 64kb page size, which makes
5106 // the usable default stack size quite a bit less. Increase the
5107 // stack for 64kb (or any > than 8kb) pages, this increases
5108 // virtual memory fragmentation (since we're not creating the
5109 // stack on a power of 2 boundary. The real fix for this
5110 // should be to fix the guard page mechanism.
5111
5112 if (vm_page_size() > 8*K) {
5113 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5114 ? threadStackSizeInBytes +
5115 ((StackYellowPages + StackRedPages) * vm_page_size())
5116 : 0;
5117 ThreadStackSize = threadStackSizeInBytes/K;
5118 }
5119
5120 // Make the stack size a multiple of the page size so that
5121 // the yellow/red zones can be guarded.
5122 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5123 vm_page_size()));
5124
5125 Solaris::libthread_init();
5126
5127 if (UseNUMA) {
5128 if (!Solaris::liblgrp_init()) {
5129 UseNUMA = false;
5130 } else {
5131 size_t lgrp_limit = os::numa_get_groups_num();
5132 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5133 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5134 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5135 if (lgrp_num < 2) {
5136 // There's only one locality group, disable NUMA.
5137 UseNUMA = false;
5138 }
5139 }
5140 // ISM is not compatible with the NUMA allocator - it always allocates
5141 // pages round-robin across the lgroups.
5142 if (UseNUMA && UseLargePages && UseISM) {
5143 if (!FLAG_IS_DEFAULT(UseNUMA)) {
5144 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseISM)) {
5145 UseLargePages = false;
5146 } else {
5147 warning("UseNUMA is not compatible with ISM large pages, disabling NUMA allocator");
5148 UseNUMA = false;
5149 }
5150 } else {
5151 UseNUMA = false;
5152 }
5153 }
5154 if (!UseNUMA && ForceNUMA) {
5155 UseNUMA = true;
5156 }
5157 }
5158
5159 Solaris::signal_sets_init();
5160 Solaris::init_signal_mem();
5161 Solaris::install_signal_handlers();
5162
5163 if (libjsigversion < JSIG_VERSION_1_4_1) {
5164 Maxlibjsigsigs = OLDMAXSIGNUM;
5165 }
5166
5167 // initialize synchronization primitives to use either thread or
5168 // lwp synchronization (controlled by UseLWPSynchronization)
5169 Solaris::synchronization_init();
5170
5171 if (MaxFDLimit) {
5172 // set the number of file descriptors to max. print out error
5173 // if getrlimit/setrlimit fails but continue regardless.
5174 struct rlimit nbr_files;
5175 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5176 if (status != 0) {
5177 if (PrintMiscellaneous && (Verbose || WizardMode))
5178 perror("os::init_2 getrlimit failed");
5179 } else {
5180 nbr_files.rlim_cur = nbr_files.rlim_max;
5181 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5182 if (status != 0) {
5183 if (PrintMiscellaneous && (Verbose || WizardMode))
5184 perror("os::init_2 setrlimit failed");
5185 }
5186 }
5187 }
5188
5189 // Calculate theoretical max. size of Threads to guard gainst
5190 // artifical out-of-memory situations, where all available address-
5191 // space has been reserved by thread stacks. Default stack size is 1Mb.
5192 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5193 JavaThread::stack_size_at_create() : (1*K*K);
5194 assert(pre_thread_stack_size != 0, "Must have a stack");
5195 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5196 // we should start doing Virtual Memory banging. Currently when the threads will
5197 // have used all but 200Mb of space.
5198 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5199 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5200
5201 // at-exit methods are called in the reverse order of their registration.
5202 // In Solaris 7 and earlier, atexit functions are called on return from
5203 // main or as a result of a call to exit(3C). There can be only 32 of
5204 // these functions registered and atexit() does not set errno. In Solaris
5205 // 8 and later, there is no limit to the number of functions registered
5206 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5207 // functions are called upon dlclose(3DL) in addition to return from main
5208 // and exit(3C).
5209
5210 if (PerfAllowAtExitRegistration) {
5211 // only register atexit functions if PerfAllowAtExitRegistration is set.
5212 // atexit functions can be delayed until process exit time, which
5213 // can be problematic for embedded VM situations. Embedded VMs should
5214 // call DestroyJavaVM() to assure that VM resources are released.
5215
5216 // note: perfMemory_exit_helper atexit function may be removed in
5217 // the future if the appropriate cleanup code can be added to the
5218 // VM_Exit VMOperation's doit method.
5219 if (atexit(perfMemory_exit_helper) != 0) {
5220 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5221 }
5222 }
5223
5224 // Init pset_loadavg function pointer
5225 init_pset_getloadavg_ptr();
5226
5227 return JNI_OK;
5228 }
5229
5230 void os::init_3(void) {
5231 return;
5232 }
5233
5234 // Mark the polling page as unreadable
5235 void os::make_polling_page_unreadable(void) {
5236 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5237 fatal("Could not disable polling page");
5238 };
5239
5240 // Mark the polling page as readable
5241 void os::make_polling_page_readable(void) {
5242 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5243 fatal("Could not enable polling page");
5244 };
5245
5246 // OS interface.
5247
5248 bool os::check_heap(bool force) { return true; }
5249
5250 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5251 static vsnprintf_t sol_vsnprintf = NULL;
5252
5253 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5254 if (!sol_vsnprintf) {
5255 //search for the named symbol in the objects that were loaded after libjvm
5256 void* where = RTLD_NEXT;
5257 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5258 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5259 if (!sol_vsnprintf){
5260 //search for the named symbol in the objects that were loaded before libjvm
5261 where = RTLD_DEFAULT;
5262 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5263 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5264 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5265 }
5266 }
5267 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5268 }
5269
5270
5271 // Is a (classpath) directory empty?
5272 bool os::dir_is_empty(const char* path) {
5273 DIR *dir = NULL;
5274 struct dirent *ptr;
5275
5276 dir = opendir(path);
5277 if (dir == NULL) return true;
5278
5279 /* Scan the directory */
5280 bool result = true;
5281 char buf[sizeof(struct dirent) + MAX_PATH];
5282 struct dirent *dbuf = (struct dirent *) buf;
5283 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5284 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5285 result = false;
5286 }
5287 }
5288 closedir(dir);
5289 return result;
5290 }
5291
5292 // This code originates from JDK's sysOpen and open64_w
5293 // from src/solaris/hpi/src/system_md.c
5294
5295 #ifndef O_DELETE
5296 #define O_DELETE 0x10000
5297 #endif
5298
5299 // Open a file. Unlink the file immediately after open returns
5300 // if the specified oflag has the O_DELETE flag set.
5301 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5302
5303 int os::open(const char *path, int oflag, int mode) {
5304 if (strlen(path) > MAX_PATH - 1) {
5305 errno = ENAMETOOLONG;
5306 return -1;
5307 }
5308 int fd;
5309 int o_delete = (oflag & O_DELETE);
5310 oflag = oflag & ~O_DELETE;
5311
5312 fd = ::open64(path, oflag, mode);
5313 if (fd == -1) return -1;
5314
5315 //If the open succeeded, the file might still be a directory
5316 {
5317 struct stat64 buf64;
5318 int ret = ::fstat64(fd, &buf64);
5319 int st_mode = buf64.st_mode;
5320
5321 if (ret != -1) {
5322 if ((st_mode & S_IFMT) == S_IFDIR) {
5323 errno = EISDIR;
5324 ::close(fd);
5325 return -1;
5326 }
5327 } else {
5328 ::close(fd);
5329 return -1;
5330 }
5331 }
5332 /*
5333 * 32-bit Solaris systems suffer from:
5334 *
5335 * - an historical default soft limit of 256 per-process file
5336 * descriptors that is too low for many Java programs.
5337 *
5338 * - a design flaw where file descriptors created using stdio
5339 * fopen must be less than 256, _even_ when the first limit above
5340 * has been raised. This can cause calls to fopen (but not calls to
5341 * open, for example) to fail mysteriously, perhaps in 3rd party
5342 * native code (although the JDK itself uses fopen). One can hardly
5343 * criticize them for using this most standard of all functions.
5344 *
5345 * We attempt to make everything work anyways by:
5346 *
5347 * - raising the soft limit on per-process file descriptors beyond
5348 * 256
5349 *
5350 * - As of Solaris 10u4, we can request that Solaris raise the 256
5351 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5352 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5353 *
5354 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5355 * workaround the bug by remapping non-stdio file descriptors below
5356 * 256 to ones beyond 256, which is done below.
5357 *
5358 * See:
5359 * 1085341: 32-bit stdio routines should support file descriptors >255
5360 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5361 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5362 * enable_extended_FILE_stdio() in VM initialisation
5363 * Giri Mandalika's blog
5364 * http://technopark02.blogspot.com/2005_05_01_archive.html
5365 */
5366 #ifndef _LP64
5367 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5368 int newfd = ::fcntl(fd, F_DUPFD, 256);
5369 if (newfd != -1) {
5370 ::close(fd);
5371 fd = newfd;
5372 }
5373 }
5374 #endif // 32-bit Solaris
5375 /*
5376 * All file descriptors that are opened in the JVM and not
5377 * specifically destined for a subprocess should have the
5378 * close-on-exec flag set. If we don't set it, then careless 3rd
5379 * party native code might fork and exec without closing all
5380 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5381 * UNIXProcess.c), and this in turn might:
5382 *
5383 * - cause end-of-file to fail to be detected on some file
5384 * descriptors, resulting in mysterious hangs, or
5385 *
5386 * - might cause an fopen in the subprocess to fail on a system
5387 * suffering from bug 1085341.
5388 *
5389 * (Yes, the default setting of the close-on-exec flag is a Unix
5390 * design flaw)
5391 *
5392 * See:
5393 * 1085341: 32-bit stdio routines should support file descriptors >255
5394 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5395 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5396 */
5397 #ifdef FD_CLOEXEC
5398 {
5399 int flags = ::fcntl(fd, F_GETFD);
5400 if (flags != -1)
5401 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5402 }
5403 #endif
5404
5405 if (o_delete != 0) {
5406 ::unlink(path);
5407 }
5408 return fd;
5409 }
5410
5411 // create binary file, rewriting existing file if required
5412 int os::create_binary_file(const char* path, bool rewrite_existing) {
5413 int oflags = O_WRONLY | O_CREAT;
5414 if (!rewrite_existing) {
5415 oflags |= O_EXCL;
5416 }
5417 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5418 }
5419
5420 // return current position of file pointer
5421 jlong os::current_file_offset(int fd) {
5422 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5423 }
5424
5425 // move file pointer to the specified offset
5426 jlong os::seek_to_file_offset(int fd, jlong offset) {
5427 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5428 }
5429
5430 jlong os::lseek(int fd, jlong offset, int whence) {
5431 return (jlong) ::lseek64(fd, offset, whence);
5432 }
5433
5434 char * os::native_path(char *path) {
5435 return path;
5436 }
5437
5438 int os::ftruncate(int fd, jlong length) {
5439 return ::ftruncate64(fd, length);
5440 }
5441
5442 int os::fsync(int fd) {
5443 RESTARTABLE_RETURN_INT(::fsync(fd));
5444 }
5445
5446 int os::available(int fd, jlong *bytes) {
5447 jlong cur, end;
5448 int mode;
5449 struct stat64 buf64;
5450
5451 if (::fstat64(fd, &buf64) >= 0) {
5452 mode = buf64.st_mode;
5453 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5454 /*
5455 * XXX: is the following call interruptible? If so, this might
5456 * need to go through the INTERRUPT_IO() wrapper as for other
5457 * blocking, interruptible calls in this file.
5458 */
5459 int n,ioctl_return;
5460
5461 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5462 if (ioctl_return>= 0) {
5463 *bytes = n;
5464 return 1;
5465 }
5466 }
5467 }
5468 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5469 return 0;
5470 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5471 return 0;
5472 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5473 return 0;
5474 }
5475 *bytes = end - cur;
5476 return 1;
5477 }
5478
5479 // Map a block of memory.
5480 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5481 char *addr, size_t bytes, bool read_only,
5482 bool allow_exec) {
5483 int prot;
5484 int flags;
5485
5486 if (read_only) {
5487 prot = PROT_READ;
5488 flags = MAP_SHARED;
5489 } else {
5490 prot = PROT_READ | PROT_WRITE;
5491 flags = MAP_PRIVATE;
5492 }
5493
5494 if (allow_exec) {
5495 prot |= PROT_EXEC;
5496 }
5497
5498 if (addr != NULL) {
5499 flags |= MAP_FIXED;
5500 }
5501
5502 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5503 fd, file_offset);
5504 if (mapped_address == MAP_FAILED) {
5505 return NULL;
5506 }
5507 return mapped_address;
5508 }
5509
5510
5511 // Remap a block of memory.
5512 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5513 char *addr, size_t bytes, bool read_only,
5514 bool allow_exec) {
5515 // same as map_memory() on this OS
5516 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5517 allow_exec);
5518 }
5519
5520
5521 // Unmap a block of memory.
5522 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5523 return munmap(addr, bytes) == 0;
5524 }
5525
5526 void os::pause() {
5527 char filename[MAX_PATH];
5528 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5529 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5530 } else {
5531 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5532 }
5533
5534 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5535 if (fd != -1) {
5536 struct stat buf;
5537 ::close(fd);
5538 while (::stat(filename, &buf) == 0) {
5539 (void)::poll(NULL, 0, 100);
5540 }
5541 } else {
5542 jio_fprintf(stderr,
5543 "Could not open pause file '%s', continuing immediately.\n", filename);
5544 }
5545 }
5546
5547 #ifndef PRODUCT
5548 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5549 // Turn this on if you need to trace synch operations.
5550 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5551 // and call record_synch_enable and record_synch_disable
5552 // around the computation of interest.
5553
5554 void record_synch(char* name, bool returning); // defined below
5555
5556 class RecordSynch {
5557 char* _name;
5558 public:
5559 RecordSynch(char* name) :_name(name)
5560 { record_synch(_name, false); }
5561 ~RecordSynch() { record_synch(_name, true); }
5562 };
5563
5564 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5565 extern "C" ret name params { \
5566 typedef ret name##_t params; \
5567 static name##_t* implem = NULL; \
5568 static int callcount = 0; \
5569 if (implem == NULL) { \
5570 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5571 if (implem == NULL) fatal(dlerror()); \
5572 } \
5573 ++callcount; \
5574 RecordSynch _rs(#name); \
5575 inner; \
5576 return implem args; \
5577 }
5578 // in dbx, examine callcounts this way:
5579 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5580
5581 #define CHECK_POINTER_OK(p) \
5582 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5583 #define CHECK_MU \
5584 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5585 #define CHECK_CV \
5586 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5587 #define CHECK_P(p) \
5588 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5589
5590 #define CHECK_MUTEX(mutex_op) \
5591 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5592
5593 CHECK_MUTEX( mutex_lock)
5594 CHECK_MUTEX( _mutex_lock)
5595 CHECK_MUTEX( mutex_unlock)
5596 CHECK_MUTEX(_mutex_unlock)
5597 CHECK_MUTEX( mutex_trylock)
5598 CHECK_MUTEX(_mutex_trylock)
5599
5600 #define CHECK_COND(cond_op) \
5601 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5602
5603 CHECK_COND( cond_wait);
5604 CHECK_COND(_cond_wait);
5605 CHECK_COND(_cond_wait_cancel);
5606
5607 #define CHECK_COND2(cond_op) \
5608 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5609
5610 CHECK_COND2( cond_timedwait);
5611 CHECK_COND2(_cond_timedwait);
5612 CHECK_COND2(_cond_timedwait_cancel);
5613
5614 // do the _lwp_* versions too
5615 #define mutex_t lwp_mutex_t
5616 #define cond_t lwp_cond_t
5617 CHECK_MUTEX( _lwp_mutex_lock)
5618 CHECK_MUTEX( _lwp_mutex_unlock)
5619 CHECK_MUTEX( _lwp_mutex_trylock)
5620 CHECK_MUTEX( __lwp_mutex_lock)
5621 CHECK_MUTEX( __lwp_mutex_unlock)
5622 CHECK_MUTEX( __lwp_mutex_trylock)
5623 CHECK_MUTEX(___lwp_mutex_lock)
5624 CHECK_MUTEX(___lwp_mutex_unlock)
5625
5626 CHECK_COND( _lwp_cond_wait);
5627 CHECK_COND( __lwp_cond_wait);
5628 CHECK_COND(___lwp_cond_wait);
5629
5630 CHECK_COND2( _lwp_cond_timedwait);
5631 CHECK_COND2( __lwp_cond_timedwait);
5632 #undef mutex_t
5633 #undef cond_t
5634
5635 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5636 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5637 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5638 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5639 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5640 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5641 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5642 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5643
5644
5645 // recording machinery:
5646
5647 enum { RECORD_SYNCH_LIMIT = 200 };
5648 char* record_synch_name[RECORD_SYNCH_LIMIT];
5649 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5650 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5651 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5652 int record_synch_count = 0;
5653 bool record_synch_enabled = false;
5654
5655 // in dbx, examine recorded data this way:
5656 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5657
5658 void record_synch(char* name, bool returning) {
5659 if (record_synch_enabled) {
5660 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5661 record_synch_name[record_synch_count] = name;
5662 record_synch_returning[record_synch_count] = returning;
5663 record_synch_thread[record_synch_count] = thr_self();
5664 record_synch_arg0ptr[record_synch_count] = &name;
5665 record_synch_count++;
5666 }
5667 // put more checking code here:
5668 // ...
5669 }
5670 }
5671
5672 void record_synch_enable() {
5673 // start collecting trace data, if not already doing so
5674 if (!record_synch_enabled) record_synch_count = 0;
5675 record_synch_enabled = true;
5676 }
5677
5678 void record_synch_disable() {
5679 // stop collecting trace data
5680 record_synch_enabled = false;
5681 }
5682
5683 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5684 #endif // PRODUCT
5685
5686 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5687 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5688 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5689
5690
5691 // JVMTI & JVM monitoring and management support
5692 // The thread_cpu_time() and current_thread_cpu_time() are only
5693 // supported if is_thread_cpu_time_supported() returns true.
5694 // They are not supported on Solaris T1.
5695
5696 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5697 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5698 // of a thread.
5699 //
5700 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5701 // returns the fast estimate available on the platform.
5702
5703 // hrtime_t gethrvtime() return value includes
5704 // user time but does not include system time
5705 jlong os::current_thread_cpu_time() {
5706 return (jlong) gethrvtime();
5707 }
5708
5709 jlong os::thread_cpu_time(Thread *thread) {
5710 // return user level CPU time only to be consistent with
5711 // what current_thread_cpu_time returns.
5712 // thread_cpu_time_info() must be changed if this changes
5713 return os::thread_cpu_time(thread, false /* user time only */);
5714 }
5715
5716 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5717 if (user_sys_cpu_time) {
5718 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5719 } else {
5720 return os::current_thread_cpu_time();
5721 }
5722 }
5723
5724 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5725 char proc_name[64];
5726 int count;
5727 prusage_t prusage;
5728 jlong lwp_time;
5729 int fd;
5730
5731 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5732 getpid(),
5733 thread->osthread()->lwp_id());
5734 fd = ::open(proc_name, O_RDONLY);
5735 if ( fd == -1 ) return -1;
5736
5737 do {
5738 count = ::pread(fd,
5739 (void *)&prusage.pr_utime,
5740 thr_time_size,
5741 thr_time_off);
5742 } while (count < 0 && errno == EINTR);
5743 ::close(fd);
5744 if ( count < 0 ) return -1;
5745
5746 if (user_sys_cpu_time) {
5747 // user + system CPU time
5748 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5749 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5750 (jlong)prusage.pr_stime.tv_nsec +
5751 (jlong)prusage.pr_utime.tv_nsec;
5752 } else {
5753 // user level CPU time only
5754 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5755 (jlong)prusage.pr_utime.tv_nsec;
5756 }
5757
5758 return(lwp_time);
5759 }
5760
5761 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5762 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5763 info_ptr->may_skip_backward = false; // elapsed time not wall time
5764 info_ptr->may_skip_forward = false; // elapsed time not wall time
5765 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5766 }
5767
5768 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5769 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5770 info_ptr->may_skip_backward = false; // elapsed time not wall time
5771 info_ptr->may_skip_forward = false; // elapsed time not wall time
5772 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5773 }
5774
5775 bool os::is_thread_cpu_time_supported() {
5776 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5777 return true;
5778 } else {
5779 return false;
5780 }
5781 }
5782
5783 // System loadavg support. Returns -1 if load average cannot be obtained.
5784 // Return the load average for our processor set if the primitive exists
5785 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5786 int os::loadavg(double loadavg[], int nelem) {
5787 if (pset_getloadavg_ptr != NULL) {
5788 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5789 } else {
5790 return ::getloadavg(loadavg, nelem);
5791 }
5792 }
5793
5794 //---------------------------------------------------------------------------------
5795
5796 static address same_page(address x, address y) {
5797 intptr_t page_bits = -os::vm_page_size();
5798 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
5799 return x;
5800 else if (x > y)
5801 return (address)(intptr_t(y) | ~page_bits) + 1;
5802 else
5803 return (address)(intptr_t(y) & page_bits);
5804 }
5805
5806 bool os::find(address addr, outputStream* st) {
5807 Dl_info dlinfo;
5808 memset(&dlinfo, 0, sizeof(dlinfo));
5809 if (dladdr(addr, &dlinfo)) {
5810 #ifdef _LP64
5811 st->print("0x%016lx: ", addr);
5812 #else
5813 st->print("0x%08x: ", addr);
5814 #endif
5815 if (dlinfo.dli_sname != NULL)
5816 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5817 else if (dlinfo.dli_fname)
5818 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5819 else
5820 st->print("<absolute address>");
5821 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname);
5822 #ifdef _LP64
5823 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase);
5824 #else
5825 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase);
5826 #endif
5827 st->cr();
5828
5829 if (Verbose) {
5830 // decode some bytes around the PC
5831 address begin = same_page(addr-40, addr);
5832 address end = same_page(addr+40, addr);
5833 address lowest = (address) dlinfo.dli_sname;
5834 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5835 if (begin < lowest) begin = lowest;
5836 Dl_info dlinfo2;
5837 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5838 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5839 end = (address) dlinfo2.dli_saddr;
5840 Disassembler::decode(begin, end, st);
5841 }
5842 return true;
5843 }
5844 return false;
5845 }
5846
5847 // Following function has been added to support HotSparc's libjvm.so running
5848 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5849 // src/solaris/hpi/native_threads in the EVM codebase.
5850 //
5851 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5852 // libraries and should thus be removed. We will leave it behind for a while
5853 // until we no longer want to able to run on top of 1.3.0 Solaris production
5854 // JDK. See 4341971.
5855
5856 #define STACK_SLACK 0x800
5857
5858 extern "C" {
5859 intptr_t sysThreadAvailableStackWithSlack() {
5860 stack_t st;
5861 intptr_t retval, stack_top;
5862 retval = thr_stksegment(&st);
5863 assert(retval == 0, "incorrect return value from thr_stksegment");
5864 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5865 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5866 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5867 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5868 }
5869 }
5870
5871 // ObjectMonitor park-unpark infrastructure ...
5872 //
5873 // We implement Solaris and Linux PlatformEvents with the
5874 // obvious condvar-mutex-flag triple.
5875 // Another alternative that works quite well is pipes:
5876 // Each PlatformEvent consists of a pipe-pair.
5877 // The thread associated with the PlatformEvent
5878 // calls park(), which reads from the input end of the pipe.
5879 // Unpark() writes into the other end of the pipe.
5880 // The write-side of the pipe must be set NDELAY.
5881 // Unfortunately pipes consume a large # of handles.
5882 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5883 // Using pipes for the 1st few threads might be workable, however.
5884 //
5885 // park() is permitted to return spuriously.
5886 // Callers of park() should wrap the call to park() in
5887 // an appropriate loop. A litmus test for the correct
5888 // usage of park is the following: if park() were modified
5889 // to immediately return 0 your code should still work,
5890 // albeit degenerating to a spin loop.
5891 //
5892 // An interesting optimization for park() is to use a trylock()
5893 // to attempt to acquire the mutex. If the trylock() fails
5894 // then we know that a concurrent unpark() operation is in-progress.
5895 // in that case the park() code could simply set _count to 0
5896 // and return immediately. The subsequent park() operation *might*
5897 // return immediately. That's harmless as the caller of park() is
5898 // expected to loop. By using trylock() we will have avoided a
5899 // avoided a context switch caused by contention on the per-thread mutex.
5900 //
5901 // TODO-FIXME:
5902 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5903 // objectmonitor implementation.
5904 // 2. Collapse the JSR166 parker event, and the
5905 // objectmonitor ParkEvent into a single "Event" construct.
5906 // 3. In park() and unpark() add:
5907 // assert (Thread::current() == AssociatedWith).
5908 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5909 // 1-out-of-N park() operations will return immediately.
5910 //
5911 // _Event transitions in park()
5912 // -1 => -1 : illegal
5913 // 1 => 0 : pass - return immediately
5914 // 0 => -1 : block
5915 //
5916 // _Event serves as a restricted-range semaphore.
5917 //
5918 // Another possible encoding of _Event would be with
5919 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5920 //
5921 // TODO-FIXME: add DTRACE probes for:
5922 // 1. Tx parks
5923 // 2. Ty unparks Tx
5924 // 3. Tx resumes from park
5925
5926
5927 // value determined through experimentation
5928 #define ROUNDINGFIX 11
5929
5930 // utility to compute the abstime argument to timedwait.
5931 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5932
5933 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5934 // millis is the relative timeout time
5935 // abstime will be the absolute timeout time
5936 if (millis < 0) millis = 0;
5937 struct timeval now;
5938 int status = gettimeofday(&now, NULL);
5939 assert(status == 0, "gettimeofday");
5940 jlong seconds = millis / 1000;
5941 jlong max_wait_period;
5942
5943 if (UseLWPSynchronization) {
5944 // forward port of fix for 4275818 (not sleeping long enough)
5945 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5946 // _lwp_cond_timedwait() used a round_down algorithm rather
5947 // than a round_up. For millis less than our roundfactor
5948 // it rounded down to 0 which doesn't meet the spec.
5949 // For millis > roundfactor we may return a bit sooner, but
5950 // since we can not accurately identify the patch level and
5951 // this has already been fixed in Solaris 9 and 8 we will
5952 // leave it alone rather than always rounding down.
5953
5954 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5955 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5956 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5957 max_wait_period = 21000000;
5958 } else {
5959 max_wait_period = 50000000;
5960 }
5961 millis %= 1000;
5962 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5963 seconds = max_wait_period;
5964 }
5965 abstime->tv_sec = now.tv_sec + seconds;
5966 long usec = now.tv_usec + millis * 1000;
5967 if (usec >= 1000000) {
5968 abstime->tv_sec += 1;
5969 usec -= 1000000;
5970 }
5971 abstime->tv_nsec = usec * 1000;
5972 return abstime;
5973 }
5974
5975 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5976 // Conceptually TryPark() should be equivalent to park(0).
5977
5978 int os::PlatformEvent::TryPark() {
5979 for (;;) {
5980 const int v = _Event ;
5981 guarantee ((v == 0) || (v == 1), "invariant") ;
5982 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5983 }
5984 }
5985
5986 void os::PlatformEvent::park() { // AKA: down()
5987 // Invariant: Only the thread associated with the Event/PlatformEvent
5988 // may call park().
5989 int v ;
5990 for (;;) {
5991 v = _Event ;
5992 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5993 }
5994 guarantee (v >= 0, "invariant") ;
5995 if (v == 0) {
5996 // Do this the hard way by blocking ...
5997 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5998 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5999 // Only for SPARC >= V8PlusA
6000 #if defined(__sparc) && defined(COMPILER2)
6001 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6002 #endif
6003 int status = os::Solaris::mutex_lock(_mutex);
6004 assert_status(status == 0, status, "mutex_lock");
6005 guarantee (_nParked == 0, "invariant") ;
6006 ++ _nParked ;
6007 while (_Event < 0) {
6008 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
6009 // Treat this the same as if the wait was interrupted
6010 // With usr/lib/lwp going to kernel, always handle ETIME
6011 status = os::Solaris::cond_wait(_cond, _mutex);
6012 if (status == ETIME) status = EINTR ;
6013 assert_status(status == 0 || status == EINTR, status, "cond_wait");
6014 }
6015 -- _nParked ;
6016 _Event = 0 ;
6017 status = os::Solaris::mutex_unlock(_mutex);
6018 assert_status(status == 0, status, "mutex_unlock");
6019 // Paranoia to ensure our locked and lock-free paths interact
6020 // correctly with each other.
6021 OrderAccess::fence();
6022 }
6023 }
6024
6025 int os::PlatformEvent::park(jlong millis) {
6026 guarantee (_nParked == 0, "invariant") ;
6027 int v ;
6028 for (;;) {
6029 v = _Event ;
6030 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
6031 }
6032 guarantee (v >= 0, "invariant") ;
6033 if (v != 0) return OS_OK ;
6034
6035 int ret = OS_TIMEOUT;
6036 timestruc_t abst;
6037 compute_abstime (&abst, millis);
6038
6039 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6040 // For Solaris SPARC set fprs.FEF=0 prior to parking.
6041 // Only for SPARC >= V8PlusA
6042 #if defined(__sparc) && defined(COMPILER2)
6043 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6044 #endif
6045 int status = os::Solaris::mutex_lock(_mutex);
6046 assert_status(status == 0, status, "mutex_lock");
6047 guarantee (_nParked == 0, "invariant") ;
6048 ++ _nParked ;
6049 while (_Event < 0) {
6050 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
6051 assert_status(status == 0 || status == EINTR ||
6052 status == ETIME || status == ETIMEDOUT,
6053 status, "cond_timedwait");
6054 if (!FilterSpuriousWakeups) break ; // previous semantics
6055 if (status == ETIME || status == ETIMEDOUT) break ;
6056 // We consume and ignore EINTR and spurious wakeups.
6057 }
6058 -- _nParked ;
6059 if (_Event >= 0) ret = OS_OK ;
6060 _Event = 0 ;
6061 status = os::Solaris::mutex_unlock(_mutex);
6062 assert_status(status == 0, status, "mutex_unlock");
6063 // Paranoia to ensure our locked and lock-free paths interact
6064 // correctly with each other.
6065 OrderAccess::fence();
6066 return ret;
6067 }
6068
6069 void os::PlatformEvent::unpark() {
6070 // Transitions for _Event:
6071 // 0 :=> 1
6072 // 1 :=> 1
6073 // -1 :=> either 0 or 1; must signal target thread
6074 // That is, we can safely transition _Event from -1 to either
6075 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
6076 // unpark() calls.
6077 // See also: "Semaphores in Plan 9" by Mullender & Cox
6078 //
6079 // Note: Forcing a transition from "-1" to "1" on an unpark() means
6080 // that it will take two back-to-back park() calls for the owning
6081 // thread to block. This has the benefit of forcing a spurious return
6082 // from the first park() call after an unpark() call which will help
6083 // shake out uses of park() and unpark() without condition variables.
6084
6085 if (Atomic::xchg(1, &_Event) >= 0) return;
6086
6087 // If the thread associated with the event was parked, wake it.
6088 // Wait for the thread assoc with the PlatformEvent to vacate.
6089 int status = os::Solaris::mutex_lock(_mutex);
6090 assert_status(status == 0, status, "mutex_lock");
6091 int AnyWaiters = _nParked;
6092 status = os::Solaris::mutex_unlock(_mutex);
6093 assert_status(status == 0, status, "mutex_unlock");
6094 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
6095 if (AnyWaiters != 0) {
6096 // We intentional signal *after* dropping the lock
6097 // to avoid a common class of futile wakeups.
6098 status = os::Solaris::cond_signal(_cond);
6099 assert_status(status == 0, status, "cond_signal");
6100 }
6101 }
6102
6103 // JSR166
6104 // -------------------------------------------------------
6105
6106 /*
6107 * The solaris and linux implementations of park/unpark are fairly
6108 * conservative for now, but can be improved. They currently use a
6109 * mutex/condvar pair, plus _counter.
6110 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6111 * sets count to 1 and signals condvar. Only one thread ever waits
6112 * on the condvar. Contention seen when trying to park implies that someone
6113 * is unparking you, so don't wait. And spurious returns are fine, so there
6114 * is no need to track notifications.
6115 */
6116
6117 #define MAX_SECS 100000000
6118 /*
6119 * This code is common to linux and solaris and will be moved to a
6120 * common place in dolphin.
6121 *
6122 * The passed in time value is either a relative time in nanoseconds
6123 * or an absolute time in milliseconds. Either way it has to be unpacked
6124 * into suitable seconds and nanoseconds components and stored in the
6125 * given timespec structure.
6126 * Given time is a 64-bit value and the time_t used in the timespec is only
6127 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6128 * overflow if times way in the future are given. Further on Solaris versions
6129 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6130 * number of seconds, in abstime, is less than current_time + 100,000,000.
6131 * As it will be 28 years before "now + 100000000" will overflow we can
6132 * ignore overflow and just impose a hard-limit on seconds using the value
6133 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6134 * years from "now".
6135 */
6136 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6137 assert (time > 0, "convertTime");
6138
6139 struct timeval now;
6140 int status = gettimeofday(&now, NULL);
6141 assert(status == 0, "gettimeofday");
6142
6143 time_t max_secs = now.tv_sec + MAX_SECS;
6144
6145 if (isAbsolute) {
6146 jlong secs = time / 1000;
6147 if (secs > max_secs) {
6148 absTime->tv_sec = max_secs;
6149 }
6150 else {
6151 absTime->tv_sec = secs;
6152 }
6153 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6154 }
6155 else {
6156 jlong secs = time / NANOSECS_PER_SEC;
6157 if (secs >= MAX_SECS) {
6158 absTime->tv_sec = max_secs;
6159 absTime->tv_nsec = 0;
6160 }
6161 else {
6162 absTime->tv_sec = now.tv_sec + secs;
6163 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6164 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6165 absTime->tv_nsec -= NANOSECS_PER_SEC;
6166 ++absTime->tv_sec; // note: this must be <= max_secs
6167 }
6168 }
6169 }
6170 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6171 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6172 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6173 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6174 }
6175
6176 void Parker::park(bool isAbsolute, jlong time) {
6177 // Ideally we'd do something useful while spinning, such
6178 // as calling unpackTime().
6179
6180 // Optional fast-path check:
6181 // Return immediately if a permit is available.
6182 // We depend on Atomic::xchg() having full barrier semantics
6183 // since we are doing a lock-free update to _counter.
6184 if (Atomic::xchg(0, &_counter) > 0) return;
6185
6186 // Optional fast-exit: Check interrupt before trying to wait
6187 Thread* thread = Thread::current();
6188 assert(thread->is_Java_thread(), "Must be JavaThread");
6189 JavaThread *jt = (JavaThread *)thread;
6190 if (Thread::is_interrupted(thread, false)) {
6191 return;
6192 }
6193
6194 // First, demultiplex/decode time arguments
6195 timespec absTime;
6196 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6197 return;
6198 }
6199 if (time > 0) {
6200 // Warning: this code might be exposed to the old Solaris time
6201 // round-down bugs. Grep "roundingFix" for details.
6202 unpackTime(&absTime, isAbsolute, time);
6203 }
6204
6205 // Enter safepoint region
6206 // Beware of deadlocks such as 6317397.
6207 // The per-thread Parker:: _mutex is a classic leaf-lock.
6208 // In particular a thread must never block on the Threads_lock while
6209 // holding the Parker:: mutex. If safepoints are pending both the
6210 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6211 ThreadBlockInVM tbivm(jt);
6212
6213 // Don't wait if cannot get lock since interference arises from
6214 // unblocking. Also. check interrupt before trying wait
6215 if (Thread::is_interrupted(thread, false) ||
6216 os::Solaris::mutex_trylock(_mutex) != 0) {
6217 return;
6218 }
6219
6220 int status ;
6221
6222 if (_counter > 0) { // no wait needed
6223 _counter = 0;
6224 status = os::Solaris::mutex_unlock(_mutex);
6225 assert (status == 0, "invariant") ;
6226 // Paranoia to ensure our locked and lock-free paths interact
6227 // correctly with each other and Java-level accesses.
6228 OrderAccess::fence();
6229 return;
6230 }
6231
6232 #ifdef ASSERT
6233 // Don't catch signals while blocked; let the running threads have the signals.
6234 // (This allows a debugger to break into the running thread.)
6235 sigset_t oldsigs;
6236 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6237 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6238 #endif
6239
6240 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6241 jt->set_suspend_equivalent();
6242 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6243
6244 // Do this the hard way by blocking ...
6245 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6246 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6247 // Only for SPARC >= V8PlusA
6248 #if defined(__sparc) && defined(COMPILER2)
6249 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6250 #endif
6251
6252 if (time == 0) {
6253 status = os::Solaris::cond_wait (_cond, _mutex) ;
6254 } else {
6255 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6256 }
6257 // Note that an untimed cond_wait() can sometimes return ETIME on older
6258 // versions of the Solaris.
6259 assert_status(status == 0 || status == EINTR ||
6260 status == ETIME || status == ETIMEDOUT,
6261 status, "cond_timedwait");
6262
6263 #ifdef ASSERT
6264 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6265 #endif
6266 _counter = 0 ;
6267 status = os::Solaris::mutex_unlock(_mutex);
6268 assert_status(status == 0, status, "mutex_unlock") ;
6269 // Paranoia to ensure our locked and lock-free paths interact
6270 // correctly with each other and Java-level accesses.
6271 OrderAccess::fence();
6272
6273 // If externally suspended while waiting, re-suspend
6274 if (jt->handle_special_suspend_equivalent_condition()) {
6275 jt->java_suspend_self();
6276 }
6277 }
6278
6279 void Parker::unpark() {
6280 int s, status ;
6281 status = os::Solaris::mutex_lock (_mutex) ;
6282 assert (status == 0, "invariant") ;
6283 s = _counter;
6284 _counter = 1;
6285 status = os::Solaris::mutex_unlock (_mutex) ;
6286 assert (status == 0, "invariant") ;
6287
6288 if (s < 1) {
6289 status = os::Solaris::cond_signal (_cond) ;
6290 assert (status == 0, "invariant") ;
6291 }
6292 }
6293
6294 extern char** environ;
6295
6296 // Run the specified command in a separate process. Return its exit value,
6297 // or -1 on failure (e.g. can't fork a new process).
6298 // Unlike system(), this function can be called from signal handler. It
6299 // doesn't block SIGINT et al.
6300 int os::fork_and_exec(char* cmd) {
6301 char * argv[4];
6302 argv[0] = (char *)"sh";
6303 argv[1] = (char *)"-c";
6304 argv[2] = cmd;
6305 argv[3] = NULL;
6306
6307 // fork is async-safe, fork1 is not so can't use in signal handler
6308 pid_t pid;
6309 Thread* t = ThreadLocalStorage::get_thread_slow();
6310 if (t != NULL && t->is_inside_signal_handler()) {
6311 pid = fork();
6312 } else {
6313 pid = fork1();
6314 }
6315
6316 if (pid < 0) {
6317 // fork failed
6318 warning("fork failed: %s", strerror(errno));
6319 return -1;
6320
6321 } else if (pid == 0) {
6322 // child process
6323
6324 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6325 execve("/usr/bin/sh", argv, environ);
6326
6327 // execve failed
6328 _exit(-1);
6329
6330 } else {
6331 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6332 // care about the actual exit code, for now.
6333
6334 int status;
6335
6336 // Wait for the child process to exit. This returns immediately if
6337 // the child has already exited. */
6338 while (waitpid(pid, &status, 0) < 0) {
6339 switch (errno) {
6340 case ECHILD: return 0;
6341 case EINTR: break;
6342 default: return -1;
6343 }
6344 }
6345
6346 if (WIFEXITED(status)) {
6347 // The child exited normally; get its exit code.
6348 return WEXITSTATUS(status);
6349 } else if (WIFSIGNALED(status)) {
6350 // The child exited because of a signal
6351 // The best value to return is 0x80 + signal number,
6352 // because that is what all Unix shells do, and because
6353 // it allows callers to distinguish between process exit and
6354 // process death by signal.
6355 return 0x80 + WTERMSIG(status);
6356 } else {
6357 // Unknown exit code; pass it through
6358 return status;
6359 }
6360 }
6361 }
6362
6363 // is_headless_jre()
6364 //
6365 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6366 // in order to report if we are running in a headless jre
6367 //
6368 // Since JDK8 xawt/libmawt.so was moved into the same directory
6369 // as libawt.so, and renamed libawt_xawt.so
6370 //
6371 bool os::is_headless_jre() {
6372 struct stat statbuf;
6373 char buf[MAXPATHLEN];
6374 char libmawtpath[MAXPATHLEN];
6375 const char *xawtstr = "/xawt/libmawt.so";
6376 const char *new_xawtstr = "/libawt_xawt.so";
6377 char *p;
6378
6379 // Get path to libjvm.so
6380 os::jvm_path(buf, sizeof(buf));
6381
6382 // Get rid of libjvm.so
6383 p = strrchr(buf, '/');
6384 if (p == NULL) return false;
6385 else *p = '\0';
6386
6387 // Get rid of client or server
6388 p = strrchr(buf, '/');
6389 if (p == NULL) return false;
6390 else *p = '\0';
6391
6392 // check xawt/libmawt.so
6393 strcpy(libmawtpath, buf);
6394 strcat(libmawtpath, xawtstr);
6395 if (::stat(libmawtpath, &statbuf) == 0) return false;
6396
6397 // check libawt_xawt.so
6398 strcpy(libmawtpath, buf);
6399 strcat(libmawtpath, new_xawtstr);
6400 if (::stat(libmawtpath, &statbuf) == 0) return false;
6401
6402 return true;
6403 }
6404
6405 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6406 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6407 }
6408
6409 int os::close(int fd) {
6410 RESTARTABLE_RETURN_INT(::close(fd));
6411 }
6412
6413 int os::socket_close(int fd) {
6414 RESTARTABLE_RETURN_INT(::close(fd));
6415 }
6416
6417 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6418 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6419 }
6420
6421 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6422 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6423 }
6424
6425 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6426 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6427 }
6428
6429 // As both poll and select can be interrupted by signals, we have to be
6430 // prepared to restart the system call after updating the timeout, unless
6431 // a poll() is done with timeout == -1, in which case we repeat with this
6432 // "wait forever" value.
6433
6434 int os::timeout(int fd, long timeout) {
6435 int res;
6436 struct timeval t;
6437 julong prevtime, newtime;
6438 static const char* aNull = 0;
6439 struct pollfd pfd;
6440 pfd.fd = fd;
6441 pfd.events = POLLIN;
6442
6443 gettimeofday(&t, &aNull);
6444 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6445
6446 for(;;) {
6447 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6448 if(res == OS_ERR && errno == EINTR) {
6449 if(timeout != -1) {
6450 gettimeofday(&t, &aNull);
6451 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6452 timeout -= newtime - prevtime;
6453 if(timeout <= 0)
6454 return OS_OK;
6455 prevtime = newtime;
6456 }
6457 } else return res;
6458 }
6459 }
6460
6461 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6462 int _result;
6463 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6464 os::Solaris::clear_interrupted);
6465
6466 // Depending on when thread interruption is reset, _result could be
6467 // one of two values when errno == EINTR
6468
6469 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6470 && (errno == EINTR)) {
6471 /* restarting a connect() changes its errno semantics */
6472 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6473 os::Solaris::clear_interrupted);
6474 /* undo these changes */
6475 if (_result == OS_ERR) {
6476 if (errno == EALREADY) {
6477 errno = EINPROGRESS; /* fall through */
6478 } else if (errno == EISCONN) {
6479 errno = 0;
6480 return OS_OK;
6481 }
6482 }
6483 }
6484 return _result;
6485 }
6486
6487 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6488 if (fd < 0) {
6489 return OS_ERR;
6490 }
6491 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6492 os::Solaris::clear_interrupted);
6493 }
6494
6495 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6496 sockaddr* from, socklen_t* fromlen) {
6497 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6498 os::Solaris::clear_interrupted);
6499 }
6500
6501 int os::sendto(int fd, char* buf, size_t len, uint flags,
6502 struct sockaddr* to, socklen_t tolen) {
6503 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6504 os::Solaris::clear_interrupted);
6505 }
6506
6507 int os::socket_available(int fd, jint *pbytes) {
6508 if (fd < 0) {
6509 return OS_OK;
6510 }
6511 int ret;
6512 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6513 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6514 // is expected to return 0 on failure and 1 on success to the jdk.
6515 return (ret == OS_ERR) ? 0 : 1;
6516 }
6517
6518 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6519 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6520 os::Solaris::clear_interrupted);
6521 }
6522
6523 // Get the default path to the core file
6524 // Returns the length of the string
6525 int os::get_core_path(char* buffer, size_t bufferSize) {
6526 const char* p = get_current_directory(buffer, bufferSize);
6527
6528 if (p == NULL) {
6529 assert(p != NULL, "failed to get current directory");
6530 return 0;
6531 }
6532
6533 return strlen(buffer);
6534 }